[PATCH v4 00/27] ata: optimize core code size on PATA only setups

[PATCH v4 00/27] ata: optimize core code size on PATA only setups

[Bartlomiej Zolnierkiewicz]

Hi,

There have been reports in the past of libata core code size
being a problem in migration from deprecated IDE subsystem on
legacy PATA only systems, i.e.:

https://lore.kernel.org/linux-ide/db2838b7-4862-785b-3a1d-3bf09811340a@gmail.com/

This patchset re-organizes libata core code to exclude SATA
specific code from being built for PATA only setups.

The end result is up to 24% (by 23949 bytes, from 101769 bytes to
77820 bytes) smaller libata core code size (as measured for m68k
arch using modified atari_defconfig) on affected setups.

I've tested this patchset using pata_falcon driver under ARAnyM
emulator.


patches #1-11 are general fixes/cleanups done in the process of
making the patchset (there should be no inter-dependencies between
them except patch #10 which depends on patch #9)

patch #12 separates PATA timings code to libata-pata-timings.c file

patches #13-15 let compiler optimize out SATA specific code on
non-SATA hosts by adding !IS_ENABLED(CONFIG_SATA_HOST) instances

patches #16-22 separate SATA only code from libata-core.c file to
libata-sata.c one

patches #23-24 separate SATA only code from libata-scsi.c file to
libata-sata.c one

patches #25-26 separate SATA only code from libata-eh.c file to
libata-sata.c one

patch #27 makes "libata.force" kernel parameter optional


Changes since v3
(https://lore.kernel.org/linux-ide/20200227182226.19188-1-b.zolnierkie@samsung.com/):
- rebased on top of next-20200317
- fixed sdev_attrs initializer entry defined twice issue found by
  kbuild-test-robot/sparse in "ata: expose ncq_enable_prio sysfs
  attribute only on NCQ capable hosts" patch

Changes since v2
(https://lore.kernel.org/linux-ide/20200207142734.8431-1-b.zolnierkie@samsung.com/):
- rebased on top of next-20200227
- added "ata: optimize ata_scsi_rbuf[] size" patch

Changes since v1
(https://lore.kernel.org/linux-ide/20200128133343.29905-1-b.zolnierkie@samsung.com/):
- added Acked-by: tag from Tejun to "ata: remove stale maintainership
  information from core code" patch
- added Reviewed-by: tag from Martin to "ata: make SATA_PMP option
  selectable only if any SATA host driver is enabled" patch
- added Reviewed-by: tag from Christoph to following patches:
  - "ata: simplify ata_scsiop_inq_89()"
  - "ata: use COMMAND_LINE_SIZE for ata_force_param_buf[] size"
  - "ata: optimize struct ata_force_param size"
  - "ata: move EXPORT_SYMBOL_GPL()s close to exported code"
  - "ata: remove EXPORT_SYMBOL_GPL()s not used by modules"
- converted "ata: add CONFIG_SATA_HOST=n version of ata_ncq_enabled()"
  patch to use IS_ENABLED()
- added "ata: let compiler optimize out ata_dev_config_ncq() on
  non-SATA hosts" and "ata: let compiler optimize out ata_eh_set_lpm()
  on non-SATA hosts" patches
- moved "ata: move sata_scr_*() to libata-core-sata.c" patch just
  after "ata: start separating SATA specific code from libata-core.c"
  one
- dropped no longer needed patches (code savings <= 8 bytes):
  - "ata: move ata_do_link_spd_horkage() to libata-core-sata.c"
  - "ata: move ata_dev_config_ncq*() to libata-core-sata.c"
  - "ata: move sata_print_link_status() to libata-core-sata.c"
  - "ata: move sata_down_spd_limit() to libata-core-sata.c"
  - "ata: move sata_link_init_spd() to libata-core-sata.c"
  - "ata: move ata_eh_set_lpm() to libata-core-sata.c"
- removed superfluos ifdefs
- dropped file names in top of file headers
- merged libata-scsi-sata.c and libata-eh-sata.c into libata-sata.c
- emphasised in patch descriptions that atari_defconfig used for
  measurements has been modified (original one is still using
  deprecated IDE subsystem)
- added "ata: make "libata.force" kernel parameter optional" patch

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics


Bartlomiej Zolnierkiewicz (27):
  ata: remove stale maintainership information from core code
  ata: expose ncq_enable_prio sysfs attribute only on NCQ capable hosts
  ata: make SATA_PMP option selectable only if any SATA host driver is
    enabled
  sata_promise: use ata_cable_sata()
  ata: simplify ata_scsiop_inq_89()
  ata: use COMMAND_LINE_SIZE for ata_force_param_buf[] size
  ata: optimize struct ata_force_param size
  ata: optimize ata_scsi_rbuf[] size
  ata: move EXPORT_SYMBOL_GPL()s close to exported code
  ata: remove EXPORT_SYMBOL_GPL()s not used by modules
  ata: fix CodingStyle issues in PATA timings code
  ata: separate PATA timings code from libata-core.c
  ata: add CONFIG_SATA_HOST=n version of ata_ncq_enabled()
  ata: let compiler optimize out ata_dev_config_ncq() on non-SATA hosts
  ata: let compiler optimize out ata_eh_set_lpm() on non-SATA hosts
  ata: start separating SATA specific code from libata-core.c
  ata: move sata_scr_*() to libata-sata.c
  ata: move *sata_set_spd*() to libata-sata.c
  ata: move sata_link_{debounce,resume}() to libata-sata.c
  ata: move sata_link_hardreset() to libata-sata.c
  ata: move ata_qc_complete_multiple() to libata-sata.c
  ata: move sata_deb_timing_*() to libata-sata.c
  ata: start separating SATA specific code from libata-scsi.c
  ata: move ata_sas_*() to libata-sata.c
  ata: start separating SATA specific code from libata-eh.c
  ata: move ata_eh_analyze_ncq_error() & co. to libata-sata.c
  ata: make "libata.force" kernel parameter optional

 drivers/ata/Kconfig               |   77 ++
 drivers/ata/Makefile              |    2 +
 drivers/ata/libata-core.c         | 1229 +++---------------------
 drivers/ata/libata-eh.c           |  224 +----
 drivers/ata/libata-pata-timings.c |  192 ++++
 drivers/ata/libata-sata.c         | 1480 +++++++++++++++++++++++++++++
 drivers/ata/libata-scsi.c         |  544 +----------
 drivers/ata/libata-sff.c          |    4 -
 drivers/ata/libata.h              |   25 +-
 drivers/ata/sata_promise.c        |    8 +-
 drivers/scsi/Kconfig              |    1 +
 drivers/scsi/libsas/Kconfig       |    1 +
 include/linux/libata.h            |  174 ++--
 13 files changed, 2066 insertions(+), 1895 deletions(-)
 create mode 100644 drivers/ata/libata-pata-timings.c
 create mode 100644 drivers/ata/libata-sata.c

-- 
2.24.1

[PATCH v4 01/27] ata: remove stale maintainership information from core code

[Bartlomiej Zolnierkiewicz]

In commit 7634ccd2da97 ("libata: maintainership update") from 2018
Jens has officially taken over libata maintainership from Tejun so
remove stale information from core libata code.

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-core.c | 4 ----
 drivers/ata/libata-eh.c   | 4 ----
 drivers/ata/libata-scsi.c | 4 ----
 drivers/ata/libata-sff.c  | 4 ----
 4 files changed, 16 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 175b2a9dc000..1b509ccc67f3 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2,10 +2,6 @@
 /*
  *  libata-core.c - helper library for ATA
  *
- *  Maintained by:  Tejun Heo <tj@kernel.org>
- *    		    Please ALWAYS copy linux-ide@vger.kernel.org
- *		    on emails.
- *
  *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
  *  Copyright 2003-2004 Jeff Garzik
  *
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 388f8ed46eab..a14e26aa1391 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2,10 +2,6 @@
 /*
  *  libata-eh.c - libata error handling
  *
- *  Maintained by:  Tejun Heo <tj@kernel.org>
- *    		    Please ALWAYS copy linux-ide@vger.kernel.org
- *		    on emails.
- *
  *  Copyright 2006 Tejun Heo <htejun@gmail.com>
  *
  *  libata documentation is available via 'make {ps|pdf}docs',
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index f76ceb520f5e..5a4f43c85131 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2,10 +2,6 @@
 /*
  *  libata-scsi.c - helper library for ATA
  *
- *  Maintained by:  Tejun Heo <tj@kernel.org>
- *    		    Please ALWAYS copy linux-ide@vger.kernel.org
- *		    on emails.
- *
  *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
  *  Copyright 2003-2004 Jeff Garzik
  *
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index ffe633f13f55..dad59ce95c7d 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -2,10 +2,6 @@
 /*
  *  libata-sff.c - helper library for PCI IDE BMDMA
  *
- *  Maintained by:  Tejun Heo <tj@kernel.org>
- *    		    Please ALWAYS copy linux-ide@vger.kernel.org
- *		    on emails.
- *
  *  Copyright 2003-2006 Red Hat, Inc.  All rights reserved.
  *  Copyright 2003-2006 Jeff Garzik
  *
-- 
2.24.1

[PATCH v4 02/27] ata: expose ncq_enable_prio sysfs attribute only on NCQ capable hosts

[Bartlomiej Zolnierkiewicz]

There is no point in exposing ncq_enable_prio sysfs attribute for
devices on PATA and non-NCQ capable SATA hosts so:

* remove dev_attr_ncq_prio_enable from ata_common_sdev_attrs[]

* add ata_ncq_sdev_attrs[]

* update ATA_NCQ_SHT() macro to use ata_ncq_sdev_attrs[]

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-scsi.c |  8 +++++++-
 include/linux/libata.h    | 11 ++++++++---
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 5a4f43c85131..7ef21e282061 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -463,11 +463,17 @@ EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
 
 struct device_attribute *ata_common_sdev_attrs[] = {
 	&dev_attr_unload_heads,
-	&dev_attr_ncq_prio_enable,
 	NULL
 };
 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
 
+struct device_attribute *ata_ncq_sdev_attrs[] = {
+	&dev_attr_unload_heads,
+	&dev_attr_ncq_prio_enable,
+	NULL
+};
+EXPORT_SYMBOL_GPL(ata_ncq_sdev_attrs);
+
 /**
  *	ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
  *	@sdev: SCSI device for which BIOS geometry is to be determined
diff --git a/include/linux/libata.h b/include/linux/libata.h
index e7090df2231b..fe8a360b4956 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1337,6 +1337,7 @@ extern int ata_link_nr_enabled(struct ata_link *link);
 extern const struct ata_port_operations ata_base_port_ops;
 extern const struct ata_port_operations sata_port_ops;
 extern struct device_attribute *ata_common_sdev_attrs[];
+extern struct device_attribute *ata_ncq_sdev_attrs[];
 
 /*
  * All sht initializers (BASE, PIO, BMDMA, NCQ) must be instantiated
@@ -1344,7 +1345,7 @@ extern struct device_attribute *ata_common_sdev_attrs[];
  * edge driver's module reference, otherwise the driver can be unloaded
  * even if the scsi_device is being accessed.
  */
-#define ATA_BASE_SHT(drv_name)					\
+#define __ATA_BASE_SHT(drv_name)				\
 	.module			= THIS_MODULE,			\
 	.name			= drv_name,			\
 	.ioctl			= ata_scsi_ioctl,		\
@@ -1358,11 +1359,15 @@ extern struct device_attribute *ata_common_sdev_attrs[];
 	.slave_configure	= ata_scsi_slave_config,	\
 	.slave_destroy		= ata_scsi_slave_destroy,	\
 	.bios_param		= ata_std_bios_param,		\
-	.unlock_native_capacity	= ata_scsi_unlock_native_capacity, \
+	.unlock_native_capacity	= ata_scsi_unlock_native_capacity
+
+#define ATA_BASE_SHT(drv_name)					\
+	__ATA_BASE_SHT(drv_name),				\
 	.sdev_attrs		= ata_common_sdev_attrs
 
 #define ATA_NCQ_SHT(drv_name)					\
-	ATA_BASE_SHT(drv_name),					\
+	__ATA_BASE_SHT(drv_name),				\
+	.sdev_attrs		= ata_ncq_sdev_attrs,		\
 	.change_queue_depth	= ata_scsi_change_queue_depth
 
 /*
-- 
2.24.1

[PATCH v4 03/27] ata: make SATA_PMP option selectable only if any SATA host driver is enabled

[Bartlomiej Zolnierkiewicz]

There is no reason to expose SATA_PMP config option when no SATA
host drivers are enabled. To fix it add SATA_HOST config option,
make all SATA host drivers select it and finally make SATA_PMP
config options depend on it.

This also serves as preparation for the future changes which
optimize libata core code size on PATA only setups.

CC: "James E.J. Bottomley" <jejb@linux.ibm.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> # for SCSI bits
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/Kconfig         | 40 +++++++++++++++++++++++++++++++++++++
 drivers/scsi/Kconfig        |  1 +
 drivers/scsi/libsas/Kconfig |  1 +
 3 files changed, 42 insertions(+)

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index a6beb2c5a692..ad7760656f71 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -34,6 +34,9 @@ if ATA
 config ATA_NONSTANDARD
        bool
 
+config SATA_HOST
+	bool
+
 config ATA_VERBOSE_ERROR
 	bool "Verbose ATA error reporting"
 	default y
@@ -73,6 +76,7 @@ config SATA_ZPODD
 
 config SATA_PMP
 	bool "SATA Port Multiplier support"
+	depends on SATA_HOST
 	default y
 	help
 	  This option adds support for SATA Port Multipliers
@@ -85,6 +89,7 @@ comment "Controllers with non-SFF native interface"
 config SATA_AHCI
 	tristate "AHCI SATA support"
 	depends on PCI
+	select SATA_HOST
 	help
 	  This option enables support for AHCI Serial ATA.
 
@@ -111,6 +116,7 @@ config SATA_MOBILE_LPM_POLICY
 
 config SATA_AHCI_PLATFORM
 	tristate "Platform AHCI SATA support"
+	select SATA_HOST
 	help
 	  This option enables support for Platform AHCI Serial ATA
 	  controllers.
@@ -121,6 +127,7 @@ config AHCI_BRCM
 	tristate "Broadcom AHCI SATA support"
 	depends on ARCH_BRCMSTB || BMIPS_GENERIC || ARCH_BCM_NSP || \
 		   ARCH_BCM_63XX
+	select SATA_HOST
 	help
 	  This option enables support for the AHCI SATA3 controller found on
 	  Broadcom SoC's.
@@ -130,6 +137,7 @@ config AHCI_BRCM
 config AHCI_DA850
 	tristate "DaVinci DA850 AHCI SATA support"
 	depends on ARCH_DAVINCI_DA850
+	select SATA_HOST
 	help
 	  This option enables support for the DaVinci DA850 SoC's
 	  onboard AHCI SATA.
@@ -139,6 +147,7 @@ config AHCI_DA850
 config AHCI_DM816
 	tristate "DaVinci DM816 AHCI SATA support"
 	depends on ARCH_OMAP2PLUS
+	select SATA_HOST
 	help
 	  This option enables support for the DaVinci DM816 SoC's
 	  onboard AHCI SATA controller.
@@ -148,6 +157,7 @@ config AHCI_DM816
 config AHCI_ST
 	tristate "ST AHCI SATA support"
 	depends on ARCH_STI
+	select SATA_HOST
 	help
 	  This option enables support for ST AHCI SATA controller.
 
@@ -157,6 +167,7 @@ config AHCI_IMX
 	tristate "Freescale i.MX AHCI SATA support"
 	depends on MFD_SYSCON && (ARCH_MXC || COMPILE_TEST)
 	depends on (HWMON && (THERMAL || !THERMAL_OF)) || !HWMON
+	select SATA_HOST
 	help
 	  This option enables support for the Freescale i.MX SoC's
 	  onboard AHCI SATA.
@@ -166,6 +177,7 @@ config AHCI_IMX
 config AHCI_CEVA
 	tristate "CEVA AHCI SATA support"
 	depends on OF
+	select SATA_HOST
 	help
 	  This option enables support for the CEVA AHCI SATA.
 	  It can be found on the Xilinx Zynq UltraScale+ MPSoC.
@@ -176,6 +188,7 @@ config AHCI_MTK
 	tristate "MediaTek AHCI SATA support"
 	depends on ARCH_MEDIATEK
 	select MFD_SYSCON
+	select SATA_HOST
 	help
 	  This option enables support for the MediaTek SoC's
 	  onboard AHCI SATA controller.
@@ -185,6 +198,7 @@ config AHCI_MTK
 config AHCI_MVEBU
 	tristate "Marvell EBU AHCI SATA support"
 	depends on ARCH_MVEBU
+	select SATA_HOST
 	help
 	  This option enables support for the Marvebu EBU SoC's
 	  onboard AHCI SATA.
@@ -203,6 +217,7 @@ config AHCI_OCTEON
 config AHCI_SUNXI
 	tristate "Allwinner sunxi AHCI SATA support"
 	depends on ARCH_SUNXI
+	select SATA_HOST
 	help
 	  This option enables support for the Allwinner sunxi SoC's
 	  onboard AHCI SATA.
@@ -212,6 +227,7 @@ config AHCI_SUNXI
 config AHCI_TEGRA
 	tristate "NVIDIA Tegra AHCI SATA support"
 	depends on ARCH_TEGRA
+	select SATA_HOST
 	help
 	  This option enables support for the NVIDIA Tegra SoC's
 	  onboard AHCI SATA.
@@ -221,12 +237,14 @@ config AHCI_TEGRA
 config AHCI_XGENE
 	tristate "APM X-Gene 6.0Gbps AHCI SATA host controller support"
 	depends on PHY_XGENE
+	select SATA_HOST
 	help
 	 This option enables support for APM X-Gene SoC SATA host controller.
 
 config AHCI_QORIQ
 	tristate "Freescale QorIQ AHCI SATA support"
 	depends on OF
+	select SATA_HOST
 	help
 	  This option enables support for the Freescale QorIQ AHCI SoC's
 	  onboard AHCI SATA.
@@ -236,6 +254,7 @@ config AHCI_QORIQ
 config SATA_FSL
 	tristate "Freescale 3.0Gbps SATA support"
 	depends on FSL_SOC
+	select SATA_HOST
 	help
 	  This option enables support for Freescale 3.0Gbps SATA controller.
 	  It can be found on MPC837x and MPC8315.
@@ -245,6 +264,7 @@ config SATA_FSL
 config SATA_GEMINI
 	tristate "Gemini SATA bridge support"
 	depends on ARCH_GEMINI || COMPILE_TEST
+	select SATA_HOST
 	default ARCH_GEMINI
 	help
 	  This enabled support for the FTIDE010 to SATA bridge
@@ -255,6 +275,7 @@ config SATA_GEMINI
 config SATA_AHCI_SEATTLE
 	tristate "AMD Seattle 6.0Gbps AHCI SATA host controller support"
 	depends on ARCH_SEATTLE
+	select SATA_HOST
 	help
 	 This option enables support for AMD Seattle SATA host controller.
 
@@ -263,12 +284,14 @@ config SATA_AHCI_SEATTLE
 config SATA_INIC162X
 	tristate "Initio 162x SATA support (Very Experimental)"
 	depends on PCI
+	select SATA_HOST
 	help
 	  This option enables support for Initio 162x Serial ATA.
 
 config SATA_ACARD_AHCI
 	tristate "ACard AHCI variant (ATP 8620)"
 	depends on PCI
+	select SATA_HOST
 	help
 	  This option enables support for Acard.
 
@@ -277,6 +300,7 @@ config SATA_ACARD_AHCI
 config SATA_SIL24
 	tristate "Silicon Image 3124/3132 SATA support"
 	depends on PCI
+	select SATA_HOST
 	help
 	  This option enables support for Silicon Image 3124/3132 Serial ATA.
 
@@ -326,6 +350,7 @@ config PATA_OCTEON_CF
 config SATA_QSTOR
 	tristate "Pacific Digital SATA QStor support"
 	depends on PCI
+	select SATA_HOST
 	help
 	  This option enables support for Pacific Digital Serial ATA QStor.
 
@@ -334,6 +359,7 @@ config SATA_QSTOR
 config SATA_SX4
 	tristate "Promise SATA SX4 support (Experimental)"
 	depends on PCI
+	select SATA_HOST
 	help
 	  This option enables support for Promise Serial ATA SX4.
 
@@ -357,6 +383,7 @@ comment "SATA SFF controllers with BMDMA"
 config ATA_PIIX
 	tristate "Intel ESB, ICH, PIIX3, PIIX4 PATA/SATA support"
 	depends on PCI
+	select SATA_HOST
 	help
 	  This option enables support for ICH5/6/7/8 Serial ATA
 	  and support for PATA on the Intel ESB/ICH/PIIX3/PIIX4 series
@@ -368,6 +395,7 @@ config SATA_DWC
 	tristate "DesignWare Cores SATA support"
 	depends on DMADEVICES
 	select GENERIC_PHY
+	select SATA_HOST
 	help
 	  This option enables support for the on-chip SATA controller of the
 	  AppliedMicro processor 460EX.
@@ -398,6 +426,7 @@ config SATA_DWC_VDEBUG
 config SATA_HIGHBANK
 	tristate "Calxeda Highbank SATA support"
 	depends on ARCH_HIGHBANK || COMPILE_TEST
+	select SATA_HOST
 	help
 	  This option enables support for the Calxeda Highbank SoC's
 	  onboard SATA.
@@ -409,6 +438,7 @@ config SATA_MV
 	depends on PCI || ARCH_DOVE || ARCH_MV78XX0 || \
 		   ARCH_MVEBU || ARCH_ORION5X || COMPILE_TEST
 	select GENERIC_PHY
+	select SATA_HOST
 	help
 	  This option enables support for the Marvell Serial ATA family.
 	  Currently supports 88SX[56]0[48][01] PCI(-X) chips,
@@ -419,6 +449,7 @@ config SATA_MV
 config SATA_NV
 	tristate "NVIDIA SATA support"
 	depends on PCI
+	select SATA_HOST
 	help
 	  This option enables support for NVIDIA Serial ATA.
 
@@ -427,6 +458,7 @@ config SATA_NV
 config SATA_PROMISE
 	tristate "Promise SATA TX2/TX4 support"
 	depends on PCI
+	select SATA_HOST
 	help
 	  This option enables support for Promise Serial ATA TX2/TX4.
 
@@ -435,6 +467,7 @@ config SATA_PROMISE
 config SATA_RCAR
 	tristate "Renesas R-Car SATA support"
 	depends on ARCH_RENESAS || COMPILE_TEST
+	select SATA_HOST
 	help
 	  This option enables support for Renesas R-Car Serial ATA.
 
@@ -443,6 +476,7 @@ config SATA_RCAR
 config SATA_SIL
 	tristate "Silicon Image SATA support"
 	depends on PCI
+	select SATA_HOST
 	help
 	  This option enables support for Silicon Image Serial ATA.
 
@@ -452,6 +486,7 @@ config SATA_SIS
 	tristate "SiS 964/965/966/180 SATA support"
 	depends on PCI
 	select PATA_SIS
+	select SATA_HOST
 	help
 	  This option enables support for SiS Serial ATA on
 	  SiS 964/965/966/180 and Parallel ATA on SiS 180.
@@ -462,6 +497,7 @@ config SATA_SIS
 config SATA_SVW
 	tristate "ServerWorks Frodo / Apple K2 SATA support"
 	depends on PCI
+	select SATA_HOST
 	help
 	  This option enables support for Broadcom/Serverworks/Apple K2
 	  SATA support.
@@ -471,6 +507,7 @@ config SATA_SVW
 config SATA_ULI
 	tristate "ULi Electronics SATA support"
 	depends on PCI
+	select SATA_HOST
 	help
 	  This option enables support for ULi Electronics SATA.
 
@@ -479,6 +516,7 @@ config SATA_ULI
 config SATA_VIA
 	tristate "VIA SATA support"
 	depends on PCI
+	select SATA_HOST
 	help
 	  This option enables support for VIA Serial ATA.
 
@@ -487,6 +525,7 @@ config SATA_VIA
 config SATA_VITESSE
 	tristate "VITESSE VSC-7174 / INTEL 31244 SATA support"
 	depends on PCI
+	select SATA_HOST
 	help
 	  This option enables support for Vitesse VSC7174 and Intel 31244 Serial ATA.
 
@@ -1113,6 +1152,7 @@ config PATA_ACPI
 config ATA_GENERIC
 	tristate "Generic ATA support"
 	depends on PCI && ATA_BMDMA
+	select SATA_HOST
 	help
 	  This option enables support for generic BIOS configured
 	  ATA controllers via the new ATA layer
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index b5be6f43ec3f..17feff174f57 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -980,6 +980,7 @@ config SCSI_SYM53C8XX_MMIO
 config SCSI_IPR
 	tristate "IBM Power Linux RAID adapter support"
 	depends on PCI && SCSI && ATA
+	select SATA_HOST
 	select FW_LOADER
 	select IRQ_POLL
 	select SGL_ALLOC
diff --git a/drivers/scsi/libsas/Kconfig b/drivers/scsi/libsas/Kconfig
index 5c6a5eff2f8e..052ee3a26f6e 100644
--- a/drivers/scsi/libsas/Kconfig
+++ b/drivers/scsi/libsas/Kconfig
@@ -19,6 +19,7 @@ config SCSI_SAS_ATA
 	bool "ATA support for libsas (requires libata)"
 	depends on SCSI_SAS_LIBSAS
 	depends on ATA = y || ATA = SCSI_SAS_LIBSAS
+	select SATA_HOST
 	help
 		Builds in ATA support into libsas.  Will necessitate
 		the loading of libata along with libsas.
-- 
2.24.1

[PATCH v4 04/27] sata_promise: use ata_cable_sata()

[Bartlomiej Zolnierkiewicz]

Use core helper instead of open-coding it.

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/sata_promise.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c
index c451d7d1c817..8729f78cef5f 100644
--- a/drivers/ata/sata_promise.c
+++ b/drivers/ata/sata_promise.c
@@ -157,7 +157,6 @@ static int pdc_sata_hardreset(struct ata_link *link, unsigned int *class,
 static void pdc_error_handler(struct ata_port *ap);
 static void pdc_post_internal_cmd(struct ata_queued_cmd *qc);
 static int pdc_pata_cable_detect(struct ata_port *ap);
-static int pdc_sata_cable_detect(struct ata_port *ap);
 
 static struct scsi_host_template pdc_ata_sht = {
 	ATA_BASE_SHT(DRV_NAME),
@@ -183,7 +182,7 @@ static const struct ata_port_operations pdc_common_ops = {
 
 static struct ata_port_operations pdc_sata_ops = {
 	.inherits		= &pdc_common_ops,
-	.cable_detect		= pdc_sata_cable_detect,
+	.cable_detect		= ata_cable_sata,
 	.freeze			= pdc_sata_freeze,
 	.thaw			= pdc_sata_thaw,
 	.scr_read		= pdc_sata_scr_read,
@@ -459,11 +458,6 @@ static int pdc_pata_cable_detect(struct ata_port *ap)
 	return ATA_CBL_PATA80;
 }
 
-static int pdc_sata_cable_detect(struct ata_port *ap)
-{
-	return ATA_CBL_SATA;
-}
-
 static int pdc_sata_scr_read(struct ata_link *link,
 			     unsigned int sc_reg, u32 *val)
 {
-- 
2.24.1

[PATCH v4 05/27] ata: simplify ata_scsiop_inq_89()

[Bartlomiej Zolnierkiewicz]

Initialize rbuf[] directly instead of using ata_tf_to_fis(). This
results in simpler and smaller code. It also allows separating
ata_tf_to_fis() into SATA specific libata part in the future.

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  20824     105    4096   25025    61c1 drivers/ata/libata-scsi.o
after:
  20782     105    4096   24983    6197 drivers/ata/libata-scsi.o

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-scsi.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 7ef21e282061..2a43eef97b87 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2350,10 +2350,6 @@ static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
  */
 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
 {
-	struct ata_taskfile tf;
-
-	memset(&tf, 0, sizeof(tf));
-
 	rbuf[1] = 0x89;			/* our page code */
 	rbuf[2] = (0x238 >> 8);		/* page size fixed at 238h */
 	rbuf[3] = (0x238 & 0xff);
@@ -2362,14 +2358,14 @@ static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
 	memcpy(&rbuf[16], "libata          ", 16);
 	memcpy(&rbuf[32], DRV_VERSION, 4);
 
-	/* we don't store the ATA device signature, so we fake it */
-
-	tf.command = ATA_DRDY;		/* really, this is Status reg */
-	tf.lbal = 0x1;
-	tf.nsect = 0x1;
-
-	ata_tf_to_fis(&tf, 0, 1, &rbuf[36]);	/* TODO: PMP? */
 	rbuf[36] = 0x34;		/* force D2H Reg FIS (34h) */
+	rbuf[37] = (1 << 7);		/* bit 7 indicates Command FIS */
+					/* TODO: PMP? */
+
+	/* we don't store the ATA device signature, so we fake it */
+	rbuf[38] = ATA_DRDY;		/* really, this is Status reg */
+	rbuf[40] = 0x1;
+	rbuf[48] = 0x1;
 
 	rbuf[56] = ATA_CMD_ID_ATA;
 
-- 
2.24.1

[PATCH v4 06/27] ata: use COMMAND_LINE_SIZE for ata_force_param_buf[] size

[Bartlomiej Zolnierkiewicz]

Use COMMAND_LINE_SIZE instead PAGE_SIZE for ata_force_param_buf[]
size as libata parameters buffer doesn't need to be bigger than
the command line buffer.

For many architectures this results in decreased libata-core.o
size (COMMAND_LINE_SIZE varies from 256 to 4096 while the minimum
PAGE_SIZE is 4096).

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  41064    4413      40   45517    b1cd drivers/ata/libata-core.o
after:
  41064     573      40   41677    a2cd drivers/ata/libata-core.o

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 1b509ccc67f3..0c9ac46d3109 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -52,6 +52,7 @@
 #include <linux/leds.h>
 #include <linux/pm_runtime.h>
 #include <linux/platform_device.h>
+#include <asm/setup.h>
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/libata.h>
@@ -106,7 +107,7 @@ struct ata_force_ent {
 static struct ata_force_ent *ata_force_tbl;
 static int ata_force_tbl_size;
 
-static char ata_force_param_buf[PAGE_SIZE] __initdata;
+static char ata_force_param_buf[COMMAND_LINE_SIZE] __initdata;
 /* param_buf is thrown away after initialization, disallow read */
 module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
 MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/admin-guide/kernel-parameters.rst for details)");
-- 
2.24.1

[PATCH v4 07/27] ata: optimize struct ata_force_param size

[Bartlomiej Zolnierkiewicz]

Optimize struct ata_force_param size by:
- using u8 for cbl and spd_limit fields
- using u16 for lflags field

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  41064     573      40   41677    a2cd drivers/ata/libata-core.o
after:
  40654     573      40   41267    a133 drivers/ata/libata-core.o

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-core.c | 6 +++---
 include/linux/libata.h    | 1 +
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 0c9ac46d3109..9660c1af5156 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -90,12 +90,12 @@ atomic_t ata_print_id = ATOMIC_INIT(0);
 
 struct ata_force_param {
 	const char	*name;
-	unsigned int	cbl;
-	int		spd_limit;
+	u8		cbl;
+	u8		spd_limit;
 	unsigned long	xfer_mask;
 	unsigned int	horkage_on;
 	unsigned int	horkage_off;
-	unsigned int	lflags;
+	u16		lflags;
 };
 
 struct ata_force_ent {
diff --git a/include/linux/libata.h b/include/linux/libata.h
index fe8a360b4956..c6d94e40ca73 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -163,6 +163,7 @@ enum {
 	ATA_DEV_NONE		= 11,	/* no device */
 
 	/* struct ata_link flags */
+	/* NOTE: struct ata_force_param currently stores lflags in u16 */
 	ATA_LFLAG_NO_HRST	= (1 << 1), /* avoid hardreset */
 	ATA_LFLAG_NO_SRST	= (1 << 2), /* avoid softreset */
 	ATA_LFLAG_ASSUME_ATA	= (1 << 3), /* assume ATA class */
-- 
2.24.1

[PATCH v4 08/27] ata: optimize ata_scsi_rbuf[] size

[Bartlomiej Zolnierkiewicz]

Currently the maximum required size of the ata_scsi_rbuf[] is
576 bytes in ata_scsiop_inq_89() so modify ATA_SCSI_RBUF_SIZE
define accordingly.

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  20782     105    4096   24983    6197 drivers/ata/libata-scsi.o
after:
  20782     105     576   21463    53d7 drivers/ata/libata-scsi.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-scsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 2a43eef97b87..7bdda82fe886 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -37,7 +37,7 @@
 #include "libata.h"
 #include "libata-transport.h"
 
-#define ATA_SCSI_RBUF_SIZE	4096
+#define ATA_SCSI_RBUF_SIZE	576
 
 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
-- 
2.24.1

[PATCH v4 09/27] ata: move EXPORT_SYMBOL_GPL()s close to exported code

[Bartlomiej Zolnierkiewicz]

Move EXPORT_SYMBOL_GPL()s close to exported code like it is
done in other kernel subsystems. As a nice side effect this
results in the removal of few ifdefs.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-core.c | 210 +++++++++++++++-----------------------
 drivers/ata/libata-eh.c   |  20 +++-
 drivers/ata/libata-scsi.c |   8 ++
 3 files changed, 110 insertions(+), 128 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 9660c1af5156..dae625fc5e8a 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -18,6 +18,11 @@
  *	http://www.compactflash.org (CF)
  *	http://www.qic.org (QIC157 - Tape and DSC)
  *	http://www.ce-ata.org (CE-ATA: not supported)
+ *
+ * libata is essentially a library of internal helper functions for
+ * low-level ATA host controller drivers.  As such, the API/ABI is
+ * likely to change as new drivers are added and updated.
+ * Do not depend on ABI/API stability.
  */
 
 #include <linux/kernel.h>
@@ -62,8 +67,11 @@
 
 /* debounce timing parameters in msecs { interval, duration, timeout } */
 const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
+EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
 const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
+EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
 const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
+EXPORT_SYMBOL_GPL(sata_deb_timing_long);
 
 const struct ata_port_operations ata_base_port_ops = {
 	.prereset		= ata_std_prereset,
@@ -72,6 +80,7 @@ const struct ata_port_operations ata_base_port_ops = {
 	.sched_eh		= ata_std_sched_eh,
 	.end_eh			= ata_std_end_eh,
 };
+EXPORT_SYMBOL_GPL(ata_base_port_ops);
 
 const struct ata_port_operations sata_port_ops = {
 	.inherits		= &ata_base_port_ops,
@@ -79,6 +88,7 @@ const struct ata_port_operations sata_port_ops = {
 	.qc_defer		= ata_std_qc_defer,
 	.hardreset		= sata_std_hardreset,
 };
+EXPORT_SYMBOL_GPL(sata_port_ops);
 
 static unsigned int ata_dev_init_params(struct ata_device *dev,
 					u16 heads, u16 sectors);
@@ -221,6 +231,7 @@ struct ata_link *ata_link_next(struct ata_link *link, struct ata_port *ap,
 
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(ata_link_next);
 
 /**
  *	ata_dev_next - device iteration helper
@@ -274,6 +285,7 @@ struct ata_device *ata_dev_next(struct ata_device *dev, struct ata_link *link,
 		goto next;
 	return dev;
 }
+EXPORT_SYMBOL_GPL(ata_dev_next);
 
 /**
  *	ata_dev_phys_link - find physical link for a device
@@ -518,6 +530,7 @@ int atapi_cmd_type(u8 opcode)
 		return ATAPI_MISC;
 	}
 }
+EXPORT_SYMBOL_GPL(atapi_cmd_type);
 
 /**
  *	ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
@@ -562,6 +575,7 @@ void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
 	fis[18] = (tf->auxiliary >> 16) & 0xff;
 	fis[19] = (tf->auxiliary >> 24) & 0xff;
 }
+EXPORT_SYMBOL_GPL(ata_tf_to_fis);
 
 /**
  *	ata_tf_from_fis - Convert SATA FIS to ATA taskfile
@@ -591,6 +605,7 @@ void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
 	tf->nsect	= fis[12];
 	tf->hob_nsect	= fis[13];
 }
+EXPORT_SYMBOL_GPL(ata_tf_from_fis);
 
 static const u8 ata_rw_cmds[] = {
 	/* pio multi */
@@ -862,6 +877,7 @@ unsigned long ata_pack_xfermask(unsigned long pio_mask,
 		((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
 		((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
 }
+EXPORT_SYMBOL_GPL(ata_pack_xfermask);
 
 /**
  *	ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
@@ -883,6 +899,7 @@ void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
 	if (udma_mask)
 		*udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
 }
+EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
 
 static const struct ata_xfer_ent {
 	int shift, bits;
@@ -917,6 +934,7 @@ u8 ata_xfer_mask2mode(unsigned long xfer_mask)
 			return ent->base + highbit - ent->shift;
 	return 0xff;
 }
+EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
 
 /**
  *	ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
@@ -940,6 +958,7 @@ unsigned long ata_xfer_mode2mask(u8 xfer_mode)
 				& ~((1 << ent->shift) - 1);
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
 
 /**
  *	ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
@@ -962,6 +981,7 @@ int ata_xfer_mode2shift(unsigned long xfer_mode)
 			return ent->shift;
 	return -1;
 }
+EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
 
 /**
  *	ata_mode_string - convert xfer_mask to string
@@ -1008,6 +1028,7 @@ const char *ata_mode_string(unsigned long xfer_mask)
 		return xfer_mode_str[highbit];
 	return "<n/a>";
 }
+EXPORT_SYMBOL_GPL(ata_mode_string);
 
 const char *sata_spd_string(unsigned int spd)
 {
@@ -1098,6 +1119,7 @@ unsigned int ata_dev_classify(const struct ata_taskfile *tf)
 
 	return ATA_DEV_UNKNOWN;
 }
+EXPORT_SYMBOL_GPL(ata_dev_classify);
 
 /**
  *	ata_port_classify - determine device type based on ATA-spec signature
@@ -1122,6 +1144,7 @@ unsigned int ata_port_classify(struct ata_port *ap,
 		ata_port_dbg(ap, "found unknown device\n");
 	return class;
 }
+EXPORT_SYMBOL_GPL(ata_port_classify);
 
 /**
  *	ata_id_string - Convert IDENTIFY DEVICE page into string
@@ -1158,6 +1181,7 @@ void ata_id_string(const u16 *id, unsigned char *s,
 		len -= 2;
 	}
 }
+EXPORT_SYMBOL_GPL(ata_id_string);
 
 /**
  *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
@@ -1185,6 +1209,7 @@ void ata_id_c_string(const u16 *id, unsigned char *s,
 		p--;
 	*p = '\0';
 }
+EXPORT_SYMBOL_GPL(ata_id_c_string);
 
 static u64 ata_id_n_sectors(const u16 *id)
 {
@@ -1525,6 +1550,7 @@ unsigned long ata_id_xfermask(const u16 *id)
 
 	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
 }
+EXPORT_SYMBOL_GPL(ata_id_xfermask);
 
 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
 {
@@ -1782,6 +1808,7 @@ unsigned int ata_pio_need_iordy(const struct ata_device *adev)
 		return 1;
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
 
 /**
  *	ata_pio_mask_no_iordy	-	Return the non IORDY mask
@@ -1822,6 +1849,7 @@ unsigned int ata_do_dev_read_id(struct ata_device *dev,
 	return ata_exec_internal(dev, tf, NULL, DMA_FROM_DEVICE,
 				     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
 }
+EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
 
 /**
  *	ata_dev_read_id - Read ID data from the specified device
@@ -2791,6 +2819,7 @@ int ata_cable_40wire(struct ata_port *ap)
 {
 	return ATA_CBL_PATA40;
 }
+EXPORT_SYMBOL_GPL(ata_cable_40wire);
 
 /**
  *	ata_cable_80wire	-	return 80 wire cable type
@@ -2804,6 +2833,7 @@ int ata_cable_80wire(struct ata_port *ap)
 {
 	return ATA_CBL_PATA80;
 }
+EXPORT_SYMBOL_GPL(ata_cable_80wire);
 
 /**
  *	ata_cable_unknown	-	return unknown PATA cable.
@@ -2816,6 +2846,7 @@ int ata_cable_unknown(struct ata_port *ap)
 {
 	return ATA_CBL_PATA_UNK;
 }
+EXPORT_SYMBOL_GPL(ata_cable_unknown);
 
 /**
  *	ata_cable_ignore	-	return ignored PATA cable.
@@ -2828,6 +2859,7 @@ int ata_cable_ignore(struct ata_port *ap)
 {
 	return ATA_CBL_PATA_IGN;
 }
+EXPORT_SYMBOL_GPL(ata_cable_ignore);
 
 /**
  *	ata_cable_sata	-	return SATA cable type
@@ -2840,6 +2872,7 @@ int ata_cable_sata(struct ata_port *ap)
 {
 	return ATA_CBL_SATA;
 }
+EXPORT_SYMBOL_GPL(ata_cable_sata);
 
 /**
  *	ata_bus_probe - Reset and probe ATA bus
@@ -3022,6 +3055,7 @@ struct ata_device *ata_dev_pair(struct ata_device *adev)
 		return NULL;
 	return pair;
 }
+EXPORT_SYMBOL_GPL(ata_dev_pair);
 
 /**
  *	sata_down_spd_limit - adjust SATA spd limit downward
@@ -3182,6 +3216,7 @@ int sata_set_spd(struct ata_link *link)
 
 	return 1;
 }
+EXPORT_SYMBOL_GPL(sata_set_spd);
 
 /*
  * This mode timing computation functionality is ported over from
@@ -3256,6 +3291,7 @@ void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
 	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
 	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
 }
+EXPORT_SYMBOL_GPL(ata_timing_merge);
 
 const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
 {
@@ -3272,6 +3308,7 @@ const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
 
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(ata_timing_find_mode);
 
 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
 		       struct ata_timing *t, int T, int UT)
@@ -3348,6 +3385,7 @@ int ata_timing_compute(struct ata_device *adev, unsigned short speed,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ata_timing_compute);
 
 /**
  *	ata_timing_cycle2mode - find xfer mode for the specified cycle duration
@@ -3399,6 +3437,7 @@ u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
 
 	return last_mode;
 }
+EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
 
 /**
  *	ata_down_xfermask_limit - adjust dev xfer masks downward
@@ -3670,6 +3709,7 @@ int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
 		*r_failed_dev = dev;
 	return rc;
 }
+EXPORT_SYMBOL_GPL(ata_do_set_mode);
 
 /**
  *	ata_wait_ready - wait for link to become ready
@@ -3779,6 +3819,7 @@ int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
 
 	return ata_wait_ready(link, deadline, check_ready);
 }
+EXPORT_SYMBOL_GPL(ata_wait_after_reset);
 
 /**
  *	sata_link_debounce - debounce SATA phy status
@@ -3849,6 +3890,7 @@ int sata_link_debounce(struct ata_link *link, const unsigned long *params,
 			return -EPIPE;
 	}
 }
+EXPORT_SYMBOL_GPL(sata_link_debounce);
 
 /**
  *	sata_link_resume - resume SATA link
@@ -3915,6 +3957,7 @@ int sata_link_resume(struct ata_link *link, const unsigned long *params,
 
 	return rc != -EINVAL ? rc : 0;
 }
+EXPORT_SYMBOL_GPL(sata_link_resume);
 
 /**
  *	sata_link_scr_lpm - manipulate SControl IPM and SPM fields
@@ -3989,6 +4032,7 @@ int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
 	ehc->i.serror &= ~SERR_PHYRDY_CHG;
 	return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
 }
+EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
 
 /**
  *	ata_std_prereset - prepare for reset
@@ -4034,6 +4078,7 @@ int ata_std_prereset(struct ata_link *link, unsigned long deadline)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ata_std_prereset);
 
 /**
  *	sata_link_hardreset - reset link via SATA phy reset
@@ -4143,6 +4188,7 @@ int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
 	}
 	return rc;
 }
+EXPORT_SYMBOL_GPL(sata_link_hardreset);
 
 /**
  *	sata_std_hardreset - COMRESET w/o waiting or classification
@@ -4169,6 +4215,7 @@ int sata_std_hardreset(struct ata_link *link, unsigned int *class,
 	rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
 	return online ? -EAGAIN : rc;
 }
+EXPORT_SYMBOL_GPL(sata_std_hardreset);
 
 /**
  *	ata_std_postreset - standard postreset callback
@@ -4193,6 +4240,7 @@ void ata_std_postreset(struct ata_link *link, unsigned int *classes)
 	/* print link status */
 	sata_print_link_status(link);
 }
+EXPORT_SYMBOL_GPL(ata_std_postreset);
 
 /**
  *	ata_dev_same_device - Determine whether new ID matches configured device
@@ -4982,11 +5030,13 @@ int ata_std_qc_defer(struct ata_queued_cmd *qc)
 
 	return ATA_DEFER_LINK;
 }
+EXPORT_SYMBOL_GPL(ata_std_qc_defer);
 
 enum ata_completion_errors ata_noop_qc_prep(struct ata_queued_cmd *qc)
 {
 	return AC_ERR_OK;
 }
+EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
 
 /**
  *	ata_sg_init - Associate command with scatter-gather table.
@@ -5008,6 +5058,7 @@ void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
 	qc->n_elem = n_elem;
 	qc->cursg = qc->sg;
 }
+EXPORT_SYMBOL_GPL(ata_sg_init);
 
 #ifdef CONFIG_HAS_DMA
 
@@ -5328,6 +5379,7 @@ void ata_qc_complete(struct ata_queued_cmd *qc)
 		__ata_qc_complete(qc);
 	}
 }
+EXPORT_SYMBOL_GPL(ata_qc_complete);
 
 /**
  *	ata_qc_get_active - get bitmask of active qcs
@@ -5410,6 +5462,7 @@ int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active)
 
 	return nr_done;
 }
+EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
 
 /**
  *	ata_qc_issue - issue taskfile to device
@@ -5504,6 +5557,7 @@ int sata_scr_valid(struct ata_link *link)
 
 	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
 }
+EXPORT_SYMBOL_GPL(sata_scr_valid);
 
 /**
  *	sata_scr_read - read SCR register of the specified port
@@ -5531,6 +5585,7 @@ int sata_scr_read(struct ata_link *link, int reg, u32 *val)
 
 	return sata_pmp_scr_read(link, reg, val);
 }
+EXPORT_SYMBOL_GPL(sata_scr_read);
 
 /**
  *	sata_scr_write - write SCR register of the specified port
@@ -5558,6 +5613,7 @@ int sata_scr_write(struct ata_link *link, int reg, u32 val)
 
 	return sata_pmp_scr_write(link, reg, val);
 }
+EXPORT_SYMBOL_GPL(sata_scr_write);
 
 /**
  *	sata_scr_write_flush - write SCR register of the specified port and flush
@@ -5590,6 +5646,7 @@ int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
 
 	return sata_pmp_scr_write(link, reg, val);
 }
+EXPORT_SYMBOL_GPL(sata_scr_write_flush);
 
 /**
  *	ata_phys_link_online - test whether the given link is online
@@ -5664,6 +5721,7 @@ bool ata_link_online(struct ata_link *link)
 	return ata_phys_link_online(link) ||
 		(slave && ata_phys_link_online(slave));
 }
+EXPORT_SYMBOL_GPL(ata_link_online);
 
 /**
  *	ata_link_offline - test whether the given link is offline
@@ -5690,6 +5748,7 @@ bool ata_link_offline(struct ata_link *link)
 	return ata_phys_link_offline(link) &&
 		(!slave || ata_phys_link_offline(slave));
 }
+EXPORT_SYMBOL_GPL(ata_link_offline);
 
 #ifdef CONFIG_PM
 static void ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
@@ -5876,6 +5935,7 @@ int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
 	host->dev->power.power_state = mesg;
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ata_host_suspend);
 
 /**
  *	ata_host_resume - resume host
@@ -5887,6 +5947,7 @@ void ata_host_resume(struct ata_host *host)
 {
 	host->dev->power.power_state = PMSG_ON;
 }
+EXPORT_SYMBOL_GPL(ata_host_resume);
 #endif
 
 const struct device_type ata_port_type = {
@@ -6097,11 +6158,13 @@ void ata_host_get(struct ata_host *host)
 {
 	kref_get(&host->kref);
 }
+EXPORT_SYMBOL_GPL(ata_host_get);
 
 void ata_host_put(struct ata_host *host)
 {
 	kref_put(&host->kref, ata_host_release);
 }
+EXPORT_SYMBOL_GPL(ata_host_put);
 
 /**
  *	ata_host_alloc - allocate and init basic ATA host resources
@@ -6173,6 +6236,7 @@ struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
 	kfree(host);
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(ata_host_alloc);
 
 /**
  *	ata_host_alloc_pinfo - alloc host and init with port_info array
@@ -6221,6 +6285,7 @@ struct ata_host *ata_host_alloc_pinfo(struct device *dev,
 
 	return host;
 }
+EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
 
 /**
  *	ata_slave_link_init - initialize slave link
@@ -6283,6 +6348,7 @@ int ata_slave_link_init(struct ata_port *ap)
 	ap->slave_link = link;
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ata_slave_link_init);
 
 static void ata_host_stop(struct device *gendev, void *res)
 {
@@ -6431,6 +6497,7 @@ int ata_host_start(struct ata_host *host)
 	devres_free(start_dr);
 	return rc;
 }
+EXPORT_SYMBOL_GPL(ata_host_start);
 
 /**
  *	ata_sas_host_init - Initialize a host struct for sas (ipr, libsas)
@@ -6449,6 +6516,7 @@ void ata_host_init(struct ata_host *host, struct device *dev,
 	host->ops = ops;
 	kref_init(&host->kref);
 }
+EXPORT_SYMBOL_GPL(ata_host_init);
 
 void __ata_port_probe(struct ata_port *ap)
 {
@@ -6602,6 +6670,7 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
 	return rc;
 
 }
+EXPORT_SYMBOL_GPL(ata_host_register);
 
 /**
  *	ata_host_activate - start host, request IRQ and register it
@@ -6664,6 +6733,7 @@ int ata_host_activate(struct ata_host *host, int irq,
 
 	return rc;
 }
+EXPORT_SYMBOL_GPL(ata_host_activate);
 
 /**
  *	ata_port_detach - Detach ATA port in preparation of device removal
@@ -6739,6 +6809,7 @@ void ata_host_detach(struct ata_host *host)
 	/* the host is dead now, dissociate ACPI */
 	ata_acpi_dissociate(host);
 }
+EXPORT_SYMBOL_GPL(ata_host_detach);
 
 #ifdef CONFIG_PCI
 
@@ -6759,6 +6830,7 @@ void ata_pci_remove_one(struct pci_dev *pdev)
 
 	ata_host_detach(host);
 }
+EXPORT_SYMBOL_GPL(ata_pci_remove_one);
 
 void ata_pci_shutdown_one(struct pci_dev *pdev)
 {
@@ -6779,6 +6851,7 @@ void ata_pci_shutdown_one(struct pci_dev *pdev)
 			ap->ops->port_stop(ap);
 	}
 }
+EXPORT_SYMBOL_GPL(ata_pci_shutdown_one);
 
 /* move to PCI subsystem */
 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
@@ -6813,6 +6886,7 @@ int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
 
 	return (tmp == bits->val) ? 1 : 0;
 }
+EXPORT_SYMBOL_GPL(pci_test_config_bits);
 
 #ifdef CONFIG_PM
 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
@@ -6823,6 +6897,7 @@ void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
 	if (mesg.event & PM_EVENT_SLEEP)
 		pci_set_power_state(pdev, PCI_D3hot);
 }
+EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
 
 int ata_pci_device_do_resume(struct pci_dev *pdev)
 {
@@ -6841,6 +6916,7 @@ int ata_pci_device_do_resume(struct pci_dev *pdev)
 	pci_set_master(pdev);
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
 
 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
 {
@@ -6855,6 +6931,7 @@ int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
 
 int ata_pci_device_resume(struct pci_dev *pdev)
 {
@@ -6866,8 +6943,8 @@ int ata_pci_device_resume(struct pci_dev *pdev)
 		ata_host_resume(host);
 	return rc;
 }
+EXPORT_SYMBOL_GPL(ata_pci_device_resume);
 #endif /* CONFIG_PM */
-
 #endif /* CONFIG_PCI */
 
 /**
@@ -6889,6 +6966,7 @@ int ata_platform_remove_one(struct platform_device *pdev)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ata_platform_remove_one);
 
 static int __init ata_parse_force_one(char **cur,
 				      struct ata_force_ent *force_ent,
@@ -7113,6 +7191,7 @@ int ata_ratelimit(void)
 {
 	return __ratelimit(&ratelimit);
 }
+EXPORT_SYMBOL_GPL(ata_ratelimit);
 
 /**
  *	ata_msleep - ATA EH owner aware msleep
@@ -7145,6 +7224,7 @@ void ata_msleep(struct ata_port *ap, unsigned int msecs)
 	if (owns_eh)
 		ata_eh_acquire(ap);
 }
+EXPORT_SYMBOL_GPL(ata_msleep);
 
 /**
  *	ata_wait_register - wait until register value changes
@@ -7191,6 +7271,7 @@ u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
 
 	return tmp;
 }
+EXPORT_SYMBOL_GPL(ata_wait_register);
 
 /**
  *	sata_lpm_ignore_phy_events - test if PHY event should be ignored
@@ -7244,10 +7325,12 @@ struct ata_port_operations ata_dummy_port_ops = {
 	.sched_eh		= ata_std_sched_eh,
 	.end_eh			= ata_std_end_eh,
 };
+EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
 
 const struct ata_port_info ata_dummy_port_info = {
 	.port_ops		= &ata_dummy_port_ops,
 };
+EXPORT_SYMBOL_GPL(ata_dummy_port_info);
 
 void ata_print_version(const struct device *dev, const char *version)
 {
@@ -7255,131 +7338,6 @@ void ata_print_version(const struct device *dev, const char *version)
 }
 EXPORT_SYMBOL(ata_print_version);
 
-/*
- * libata is essentially a library of internal helper functions for
- * low-level ATA host controller drivers.  As such, the API/ABI is
- * likely to change as new drivers are added and updated.
- * Do not depend on ABI/API stability.
- */
-EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
-EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
-EXPORT_SYMBOL_GPL(sata_deb_timing_long);
-EXPORT_SYMBOL_GPL(ata_base_port_ops);
-EXPORT_SYMBOL_GPL(sata_port_ops);
-EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
-EXPORT_SYMBOL_GPL(ata_dummy_port_info);
-EXPORT_SYMBOL_GPL(ata_link_next);
-EXPORT_SYMBOL_GPL(ata_dev_next);
-EXPORT_SYMBOL_GPL(ata_std_bios_param);
-EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity);
-EXPORT_SYMBOL_GPL(ata_host_init);
-EXPORT_SYMBOL_GPL(ata_host_alloc);
-EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
-EXPORT_SYMBOL_GPL(ata_slave_link_init);
-EXPORT_SYMBOL_GPL(ata_host_start);
-EXPORT_SYMBOL_GPL(ata_host_register);
-EXPORT_SYMBOL_GPL(ata_host_activate);
-EXPORT_SYMBOL_GPL(ata_host_detach);
-EXPORT_SYMBOL_GPL(ata_sg_init);
-EXPORT_SYMBOL_GPL(ata_qc_complete);
-EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
-EXPORT_SYMBOL_GPL(atapi_cmd_type);
-EXPORT_SYMBOL_GPL(ata_tf_to_fis);
-EXPORT_SYMBOL_GPL(ata_tf_from_fis);
-EXPORT_SYMBOL_GPL(ata_pack_xfermask);
-EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
-EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
-EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
-EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
-EXPORT_SYMBOL_GPL(ata_mode_string);
-EXPORT_SYMBOL_GPL(ata_id_xfermask);
-EXPORT_SYMBOL_GPL(ata_do_set_mode);
-EXPORT_SYMBOL_GPL(ata_std_qc_defer);
-EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
-EXPORT_SYMBOL_GPL(ata_dev_disable);
-EXPORT_SYMBOL_GPL(sata_set_spd);
-EXPORT_SYMBOL_GPL(ata_wait_after_reset);
-EXPORT_SYMBOL_GPL(sata_link_debounce);
-EXPORT_SYMBOL_GPL(sata_link_resume);
-EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
-EXPORT_SYMBOL_GPL(ata_std_prereset);
-EXPORT_SYMBOL_GPL(sata_link_hardreset);
-EXPORT_SYMBOL_GPL(sata_std_hardreset);
-EXPORT_SYMBOL_GPL(ata_std_postreset);
-EXPORT_SYMBOL_GPL(ata_dev_classify);
-EXPORT_SYMBOL_GPL(ata_port_classify);
-EXPORT_SYMBOL_GPL(ata_dev_pair);
-EXPORT_SYMBOL_GPL(ata_ratelimit);
-EXPORT_SYMBOL_GPL(ata_msleep);
-EXPORT_SYMBOL_GPL(ata_wait_register);
-EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
-EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
-EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
-EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
-EXPORT_SYMBOL_GPL(__ata_change_queue_depth);
-EXPORT_SYMBOL_GPL(sata_scr_valid);
-EXPORT_SYMBOL_GPL(sata_scr_read);
-EXPORT_SYMBOL_GPL(sata_scr_write);
-EXPORT_SYMBOL_GPL(sata_scr_write_flush);
-EXPORT_SYMBOL_GPL(ata_link_online);
-EXPORT_SYMBOL_GPL(ata_link_offline);
-#ifdef CONFIG_PM
-EXPORT_SYMBOL_GPL(ata_host_suspend);
-EXPORT_SYMBOL_GPL(ata_host_resume);
-#endif /* CONFIG_PM */
-EXPORT_SYMBOL_GPL(ata_id_string);
-EXPORT_SYMBOL_GPL(ata_id_c_string);
-EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
-EXPORT_SYMBOL_GPL(ata_scsi_simulate);
-
-EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
-EXPORT_SYMBOL_GPL(ata_timing_find_mode);
-EXPORT_SYMBOL_GPL(ata_timing_compute);
-EXPORT_SYMBOL_GPL(ata_timing_merge);
-EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
-
-#ifdef CONFIG_PCI
-EXPORT_SYMBOL_GPL(pci_test_config_bits);
-EXPORT_SYMBOL_GPL(ata_pci_shutdown_one);
-EXPORT_SYMBOL_GPL(ata_pci_remove_one);
-#ifdef CONFIG_PM
-EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
-EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
-EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
-EXPORT_SYMBOL_GPL(ata_pci_device_resume);
-#endif /* CONFIG_PM */
-#endif /* CONFIG_PCI */
-
-EXPORT_SYMBOL_GPL(ata_platform_remove_one);
-
-EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
-EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
-EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
-EXPORT_SYMBOL_GPL(ata_port_desc);
-#ifdef CONFIG_PCI
-EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
-#endif /* CONFIG_PCI */
-EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
-EXPORT_SYMBOL_GPL(ata_link_abort);
-EXPORT_SYMBOL_GPL(ata_port_abort);
-EXPORT_SYMBOL_GPL(ata_port_freeze);
-EXPORT_SYMBOL_GPL(sata_async_notification);
-EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
-EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
-EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
-EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
-EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
-EXPORT_SYMBOL_GPL(ata_do_eh);
-EXPORT_SYMBOL_GPL(ata_std_error_handler);
-
-EXPORT_SYMBOL_GPL(ata_cable_40wire);
-EXPORT_SYMBOL_GPL(ata_cable_80wire);
-EXPORT_SYMBOL_GPL(ata_cable_unknown);
-EXPORT_SYMBOL_GPL(ata_cable_ignore);
-EXPORT_SYMBOL_GPL(ata_cable_sata);
-EXPORT_SYMBOL_GPL(ata_host_get);
-EXPORT_SYMBOL_GPL(ata_host_put);
-
 EXPORT_TRACEPOINT_SYMBOL_GPL(ata_tf_load);
 EXPORT_TRACEPOINT_SYMBOL_GPL(ata_exec_command);
 EXPORT_TRACEPOINT_SYMBOL_GPL(ata_bmdma_setup);
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index a14e26aa1391..827d437d8cb4 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -180,6 +180,7 @@ void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
 	__ata_ehi_pushv_desc(ehi, fmt, args);
 	va_end(args);
 }
+EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
 
 /**
  *	ata_ehi_push_desc - push error description with separator
@@ -203,6 +204,7 @@ void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
 	__ata_ehi_pushv_desc(ehi, fmt, args);
 	va_end(args);
 }
+EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
 
 /**
  *	ata_ehi_clear_desc - clean error description
@@ -218,6 +220,7 @@ void ata_ehi_clear_desc(struct ata_eh_info *ehi)
 	ehi->desc[0] = '\0';
 	ehi->desc_len = 0;
 }
+EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
 
 /**
  *	ata_port_desc - append port description
@@ -245,9 +248,9 @@ void ata_port_desc(struct ata_port *ap, const char *fmt, ...)
 	__ata_ehi_pushv_desc(&ap->link.eh_info, fmt, args);
 	va_end(args);
 }
+EXPORT_SYMBOL_GPL(ata_port_desc);
 
 #ifdef CONFIG_PCI
-
 /**
  *	ata_port_pbar_desc - append PCI BAR description
  *	@ap: target ATA port
@@ -284,7 +287,7 @@ void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset,
 		ata_port_desc(ap, "%s 0x%llx", name,
 				start + (unsigned long long)offset);
 }
-
+EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
 #endif /* CONFIG_PCI */
 
 static int ata_lookup_timeout_table(u8 cmd)
@@ -966,6 +969,7 @@ void ata_port_schedule_eh(struct ata_port *ap)
 	/* see: ata_std_sched_eh, unless you know better */
 	ap->ops->sched_eh(ap);
 }
+EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
 
 static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link)
 {
@@ -1008,6 +1012,7 @@ int ata_link_abort(struct ata_link *link)
 {
 	return ata_do_link_abort(link->ap, link);
 }
+EXPORT_SYMBOL_GPL(ata_link_abort);
 
 /**
  *	ata_port_abort - abort all qc's on the port
@@ -1025,6 +1030,7 @@ int ata_port_abort(struct ata_port *ap)
 {
 	return ata_do_link_abort(ap, NULL);
 }
+EXPORT_SYMBOL_GPL(ata_port_abort);
 
 /**
  *	__ata_port_freeze - freeze port
@@ -1081,6 +1087,7 @@ int ata_port_freeze(struct ata_port *ap)
 
 	return nr_aborted;
 }
+EXPORT_SYMBOL_GPL(ata_port_freeze);
 
 /**
  *	sata_async_notification - SATA async notification handler
@@ -1154,6 +1161,7 @@ int sata_async_notification(struct ata_port *ap)
 		return 0;
 	}
 }
+EXPORT_SYMBOL_GPL(sata_async_notification);
 
 /**
  *	ata_eh_freeze_port - EH helper to freeze port
@@ -1175,6 +1183,7 @@ void ata_eh_freeze_port(struct ata_port *ap)
 	__ata_port_freeze(ap);
 	spin_unlock_irqrestore(ap->lock, flags);
 }
+EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
 
 /**
  *	ata_port_thaw_port - EH helper to thaw port
@@ -1203,6 +1212,7 @@ void ata_eh_thaw_port(struct ata_port *ap)
 
 	trace_ata_port_thaw(ap);
 }
+EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
 
 static void ata_eh_scsidone(struct scsi_cmnd *scmd)
 {
@@ -1237,6 +1247,7 @@ void ata_eh_qc_complete(struct ata_queued_cmd *qc)
 	scmd->retries = scmd->allowed;
 	__ata_eh_qc_complete(qc);
 }
+EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
 
 /**
  *	ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
@@ -1256,6 +1267,7 @@ void ata_eh_qc_retry(struct ata_queued_cmd *qc)
 		scmd->allowed++;
 	__ata_eh_qc_complete(qc);
 }
+EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
 
 /**
  *	ata_dev_disable - disable ATA device
@@ -1282,6 +1294,7 @@ void ata_dev_disable(struct ata_device *dev)
 	 */
 	ata_ering_clear(&dev->ering);
 }
+EXPORT_SYMBOL_GPL(ata_dev_disable);
 
 /**
  *	ata_eh_detach_dev - detach ATA device
@@ -1724,6 +1737,7 @@ void ata_eh_analyze_ncq_error(struct ata_link *link)
 
 	ehc->i.err_mask &= ~AC_ERR_DEV;
 }
+EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
 
 /**
  *	ata_eh_analyze_tf - analyze taskfile of a failed qc
@@ -4030,6 +4044,7 @@ void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
 
 	ata_eh_finish(ap);
 }
+EXPORT_SYMBOL_GPL(ata_do_eh);
 
 /**
  *	ata_std_error_handler - standard error handler
@@ -4051,6 +4066,7 @@ void ata_std_error_handler(struct ata_port *ap)
 
 	ata_do_eh(ap, ops->prereset, ops->softreset, hardreset, ops->postreset);
 }
+EXPORT_SYMBOL_GPL(ata_std_error_handler);
 
 #ifdef CONFIG_PM
 /**
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 7bdda82fe886..2b0262aa3bcc 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -502,6 +502,7 @@ int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ata_std_bios_param);
 
 /**
  *	ata_scsi_unlock_native_capacity - unlock native capacity
@@ -531,6 +532,7 @@ void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
 	spin_unlock_irqrestore(ap->lock, flags);
 	ata_port_wait_eh(ap);
 }
+EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity);
 
 /**
  *	ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
@@ -1347,6 +1349,7 @@ int ata_scsi_slave_config(struct scsi_device *sdev)
 
 	return rc;
 }
+EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
 
 /**
  *	ata_scsi_slave_destroy - SCSI device is about to be destroyed
@@ -1386,6 +1389,7 @@ void ata_scsi_slave_destroy(struct scsi_device *sdev)
 	q->dma_drain_buffer = NULL;
 	q->dma_drain_size = 0;
 }
+EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
 
 /**
  *	__ata_change_queue_depth - helper for ata_scsi_change_queue_depth
@@ -1429,6 +1433,7 @@ int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
 
 	return scsi_change_queue_depth(sdev, queue_depth);
 }
+EXPORT_SYMBOL_GPL(__ata_change_queue_depth);
 
 /**
  *	ata_scsi_change_queue_depth - SCSI callback for queue depth config
@@ -1451,6 +1456,7 @@ int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
 
 	return __ata_change_queue_depth(ap, sdev, queue_depth);
 }
+EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
 
 /**
  *	ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
@@ -4392,6 +4398,7 @@ int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
 
 	return rc;
 }
+EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
 
 /**
  *	ata_scsi_simulate - simulate SCSI command on ATA device
@@ -4515,6 +4522,7 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
 
 	cmd->scsi_done(cmd);
 }
+EXPORT_SYMBOL_GPL(ata_scsi_simulate);
 
 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
 {
-- 
2.24.1

[PATCH v4 10/27] ata: remove EXPORT_SYMBOL_GPL()s not used by modules

[Bartlomiej Zolnierkiewicz]

Remove EXPORT_SYMBOL_GPL()s for functions used only by
the core libata code.

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  39838     573      40   40451    9e03 drivers/ata/libata-core.o
  21071     105     576   21752    54f8 drivers/ata/libata-scsi.o
  17519      18       0   17537    4481 drivers/ata/libata-eh.o
after:
  39688     573      40   40301    9d6d drivers/ata/libata-core.o
  21040     105     576   21721    54d9 drivers/ata/libata-scsi.o
  17405      18       0   17423    440f drivers/ata/libata-eh.o

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-core.c | 5 -----
 drivers/ata/libata-eh.c   | 4 ----
 drivers/ata/libata-scsi.c | 1 -
 3 files changed, 10 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index dae625fc5e8a..e4df091fdcde 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -80,7 +80,6 @@ const struct ata_port_operations ata_base_port_ops = {
 	.sched_eh		= ata_std_sched_eh,
 	.end_eh			= ata_std_end_eh,
 };
-EXPORT_SYMBOL_GPL(ata_base_port_ops);
 
 const struct ata_port_operations sata_port_ops = {
 	.inherits		= &ata_base_port_ops,
@@ -899,7 +898,6 @@ void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
 	if (udma_mask)
 		*udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
 }
-EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
 
 static const struct ata_xfer_ent {
 	int shift, bits;
@@ -3437,7 +3435,6 @@ u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
 
 	return last_mode;
 }
-EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
 
 /**
  *	ata_down_xfermask_limit - adjust dev xfer masks downward
@@ -5058,7 +5055,6 @@ void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
 	qc->n_elem = n_elem;
 	qc->cursg = qc->sg;
 }
-EXPORT_SYMBOL_GPL(ata_sg_init);
 
 #ifdef CONFIG_HAS_DMA
 
@@ -6158,7 +6154,6 @@ void ata_host_get(struct ata_host *host)
 {
 	kref_get(&host->kref);
 }
-EXPORT_SYMBOL_GPL(ata_host_get);
 
 void ata_host_put(struct ata_host *host)
 {
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 827d437d8cb4..3b8d276b5107 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -1212,7 +1212,6 @@ void ata_eh_thaw_port(struct ata_port *ap)
 
 	trace_ata_port_thaw(ap);
 }
-EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
 
 static void ata_eh_scsidone(struct scsi_cmnd *scmd)
 {
@@ -1247,7 +1246,6 @@ void ata_eh_qc_complete(struct ata_queued_cmd *qc)
 	scmd->retries = scmd->allowed;
 	__ata_eh_qc_complete(qc);
 }
-EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
 
 /**
  *	ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
@@ -1267,7 +1265,6 @@ void ata_eh_qc_retry(struct ata_queued_cmd *qc)
 		scmd->allowed++;
 	__ata_eh_qc_complete(qc);
 }
-EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
 
 /**
  *	ata_dev_disable - disable ATA device
@@ -4044,7 +4041,6 @@ void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
 
 	ata_eh_finish(ap);
 }
-EXPORT_SYMBOL_GPL(ata_do_eh);
 
 /**
  *	ata_std_error_handler - standard error handler
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 2b0262aa3bcc..2bf1376bc027 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -4522,7 +4522,6 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
 
 	cmd->scsi_done(cmd);
 }
-EXPORT_SYMBOL_GPL(ata_scsi_simulate);
 
 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
 {
-- 
2.24.1

[PATCH v4 11/27] ata: fix CodingStyle issues in PATA timings code

[Bartlomiej Zolnierkiewicz]

* fix the overly long line in ata_timing_quantize()

* use standard kernel CodingStyle in ata_timing_merge()

* do not use assignment in if condition in ata_timing_compute()

* fix non-standard comment style in ata_timing_compute()

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-core.c | 42 +++++++++++++++++++++++++--------------
 1 file changed, 27 insertions(+), 15 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index e4df091fdcde..52d32c88b854 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -3263,7 +3263,8 @@ static const struct ata_timing ata_timing[] = {
 #define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
 #define EZ(v, unit)		((v)?ENOUGH(((v) * 1000), unit):0)
 
-static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
+static void ata_timing_quantize(const struct ata_timing *t,
+				struct ata_timing *q, int T, int UT)
 {
 	q->setup	= EZ(t->setup,       T);
 	q->act8b	= EZ(t->act8b,       T);
@@ -3279,15 +3280,24 @@ static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q
 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
 		      struct ata_timing *m, unsigned int what)
 {
-	if (what & ATA_TIMING_SETUP  ) m->setup   = max(a->setup,   b->setup);
-	if (what & ATA_TIMING_ACT8B  ) m->act8b   = max(a->act8b,   b->act8b);
-	if (what & ATA_TIMING_REC8B  ) m->rec8b   = max(a->rec8b,   b->rec8b);
-	if (what & ATA_TIMING_CYC8B  ) m->cyc8b   = max(a->cyc8b,   b->cyc8b);
-	if (what & ATA_TIMING_ACTIVE ) m->active  = max(a->active,  b->active);
-	if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
-	if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
-	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
-	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
+	if (what & ATA_TIMING_SETUP)
+		m->setup = max(a->setup, b->setup);
+	if (what & ATA_TIMING_ACT8B)
+		m->act8b = max(a->act8b, b->act8b);
+	if (what & ATA_TIMING_REC8B)
+		m->rec8b = max(a->rec8b, b->rec8b);
+	if (what & ATA_TIMING_CYC8B)
+		m->cyc8b = max(a->cyc8b, b->cyc8b);
+	if (what & ATA_TIMING_ACTIVE)
+		m->active = max(a->active, b->active);
+	if (what & ATA_TIMING_RECOVER)
+		m->recover = max(a->recover, b->recover);
+	if (what & ATA_TIMING_DMACK_HOLD)
+		m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
+	if (what & ATA_TIMING_CYCLE)
+		m->cycle = max(a->cycle, b->cycle);
+	if (what & ATA_TIMING_UDMA)
+		m->udma = max(a->udma, b->udma);
 }
 EXPORT_SYMBOL_GPL(ata_timing_merge);
 
@@ -3318,8 +3328,8 @@ int ata_timing_compute(struct ata_device *adev, unsigned short speed,
 	/*
 	 * Find the mode.
 	 */
-
-	if (!(s = ata_timing_find_mode(speed)))
+	s = ata_timing_find_mode(speed);
+	if (!s)
 		return -EINVAL;
 
 	memcpy(t, s, sizeof(*s));
@@ -3375,9 +3385,11 @@ int ata_timing_compute(struct ata_device *adev, unsigned short speed,
 		t->recover = t->cycle - t->active;
 	}
 
-	/* In a few cases quantisation may produce enough errors to
-	   leave t->cycle too low for the sum of active and recovery
-	   if so we must correct this */
+	/*
+	 * In a few cases quantisation may produce enough errors to
+	 * leave t->cycle too low for the sum of active and recovery
+	 * if so we must correct this.
+	 */
 	if (t->active + t->recover > t->cycle)
 		t->cycle = t->active + t->recover;
 
-- 
2.24.1

[PATCH v4 12/27] ata: separate PATA timings code from libata-core.c

[Bartlomiej Zolnierkiewicz]

Separate PATA timings code from libata-core.c:

* add PATA_TIMINGS config option and make corresponding PATA
  host drivers (and ATA ACPI code) select it

* move following PATA timings code to libata-pata-timings.c:
  - ata_timing_quantize()
  - ata_timing_merge()
  - ata_timing_find_mode()
  - ata_timing_compute()

* group above functions together in <linux/libata.h>

* include libata-pata-timings.c in the build when PATA_TIMINGS
  config option is enabled

* cover ata_timing_cycle2mode() with CONFIG_ATA_ACPI ifdef (it
  depends on code from libata-core.c and libata-pata-timings.c
  while its only user is ATA ACPI)

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  39688     573      40   40301    9d6d drivers/ata/libata-core.o
after:
  37820     572      40   38432    9620 drivers/ata/libata-core.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/Kconfig               |  21 ++++
 drivers/ata/Makefile              |   1 +
 drivers/ata/libata-core.c         | 183 +---------------------------
 drivers/ata/libata-pata-timings.c | 192 ++++++++++++++++++++++++++++++
 include/linux/libata.h            |  16 ++-
 5 files changed, 226 insertions(+), 187 deletions(-)
 create mode 100644 drivers/ata/libata-pata-timings.c

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index ad7760656f71..5b55ebf56b5a 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -37,6 +37,9 @@ config ATA_NONSTANDARD
 config SATA_HOST
 	bool
 
+config PATA_TIMINGS
+	bool
+
 config ATA_VERBOSE_ERROR
 	bool "Verbose ATA error reporting"
 	default y
@@ -51,6 +54,7 @@ config ATA_VERBOSE_ERROR
 config ATA_ACPI
 	bool "ATA ACPI Support"
 	depends on ACPI
+	select PATA_TIMINGS
 	default y
 	help
 	  This option adds support for ATA-related ACPI objects.
@@ -341,6 +345,7 @@ config PDC_ADMA
 config PATA_OCTEON_CF
 	tristate "OCTEON Boot Bus Compact Flash support"
 	depends on CAVIUM_OCTEON_SOC
+	select PATA_TIMINGS
 	help
 	  This option enables a polled compact flash driver for use with
 	  compact flash cards attached to the OCTEON boot bus.
@@ -536,6 +541,7 @@ comment "PATA SFF controllers with BMDMA"
 config PATA_ALI
 	tristate "ALi PATA support"
 	depends on PCI
+	select PATA_TIMINGS
 	help
 	  This option enables support for the ALi ATA interfaces
 	  found on the many ALi chipsets.
@@ -545,6 +551,7 @@ config PATA_ALI
 config PATA_AMD
 	tristate "AMD/NVidia PATA support"
 	depends on PCI
+	select PATA_TIMINGS
 	help
 	  This option enables support for the AMD and NVidia PATA
 	  interfaces found on the chipsets for Athlon/Athlon64.
@@ -579,6 +586,7 @@ config PATA_ATIIXP
 config PATA_ATP867X
 	tristate "ARTOP/Acard ATP867X PATA support"
 	depends on PCI
+	select PATA_TIMINGS
 	help
 	  This option enables support for ARTOP/Acard ATP867X PATA
 	  controllers.
@@ -588,6 +596,7 @@ config PATA_ATP867X
 config PATA_BK3710
 	tristate "Palmchip BK3710 PATA support"
 	depends on ARCH_DAVINCI
+	select PATA_TIMINGS
 	help
 	  This option enables support for the integrated IDE controller on
 	  the TI DaVinci SoC.
@@ -597,6 +606,7 @@ config PATA_BK3710
 config PATA_CMD64X
 	tristate "CMD64x PATA support"
 	depends on PCI
+	select PATA_TIMINGS
 	help
 	  This option enables support for the CMD64x series chips
 	  except for the CMD640.
@@ -642,6 +652,7 @@ config PATA_CS5536
 config PATA_CYPRESS
 	tristate "Cypress CY82C693 PATA support (Very Experimental)"
 	depends on PCI
+	select PATA_TIMINGS
 	help
 	  This option enables support for the Cypress/Contaq CY82C693
 	  chipset found in some Alpha systems
@@ -660,6 +671,7 @@ config PATA_EFAR
 config PATA_EP93XX
 	tristate "Cirrus Logic EP93xx PATA support"
 	depends on ARCH_EP93XX
+	select PATA_TIMINGS
 	help
 	  This option enables support for the PATA controller in
 	  the Cirrus Logic EP9312 and EP9315 ARM CPU.
@@ -724,6 +736,7 @@ config PATA_HPT3X3_DMA
 config PATA_ICSIDE
 	tristate "Acorn ICS PATA support"
 	depends on ARM && ARCH_ACORN
+	select PATA_TIMINGS
 	help
 	  On Acorn systems, say Y here if you wish to use the ICS PATA
 	  interface card.  This is not required for ICS partition support.
@@ -732,6 +745,7 @@ config PATA_ICSIDE
 config PATA_IMX
 	tristate "PATA support for Freescale iMX"
 	depends on ARCH_MXC
+	select PATA_TIMINGS
 	help
 	  This option enables support for the PATA host available on Freescale
           iMX SoCs.
@@ -817,6 +831,7 @@ config PATA_NINJA32
 config PATA_NS87415
 	tristate "Nat Semi NS87415 PATA support"
 	depends on PCI
+	select PATA_TIMINGS
 	help
 	  This option enables support for the National Semiconductor
 	  NS87415 PCI-IDE controller.
@@ -941,6 +956,7 @@ config PATA_TRIFLEX
 config PATA_VIA
 	tristate "VIA PATA support"
 	depends on PCI
+	select PATA_TIMINGS
 	help
 	  This option enables support for the VIA PATA interfaces
 	  found on the many VIA chipsets.
@@ -974,6 +990,7 @@ comment "PIO-only SFF controllers"
 config PATA_CMD640_PCI
 	tristate "CMD640 PCI PATA support (Experimental)"
 	depends on PCI
+	select PATA_TIMINGS
 	help
 	  This option enables support for the CMD640 PCI IDE
 	  interface chip. Only the primary channel is currently
@@ -1044,6 +1061,7 @@ config PATA_MPIIX
 config PATA_NS87410
 	tristate "Nat Semi NS87410 PATA support"
 	depends on PCI
+	select PATA_TIMINGS
 	help
 	  This option enables support for the National Semiconductor
 	  NS87410 PCI-IDE controller.
@@ -1124,6 +1142,7 @@ config PATA_RZ1000
 config PATA_SAMSUNG_CF
 	tristate "Samsung SoC PATA support"
 	depends on SAMSUNG_DEV_IDE
+	select PATA_TIMINGS
 	help
 	  This option enables basic support for Samsung's S3C/S5P board
 	  PATA controllers via the new ATA layer
@@ -1143,6 +1162,7 @@ comment "Generic fallback / legacy drivers"
 config PATA_ACPI
 	tristate "ACPI firmware driver for PATA"
 	depends on ATA_ACPI && ATA_BMDMA && PCI
+	select PATA_TIMINGS
 	help
 	  This option enables an ACPI method driver which drives
 	  motherboard PATA controller interfaces through the ACPI
@@ -1162,6 +1182,7 @@ config ATA_GENERIC
 config PATA_LEGACY
 	tristate "Legacy ISA PATA support (Experimental)"
 	depends on (ISA || PCI)
+	select PATA_TIMINGS
 	help
 	  This option enables support for ISA/VLB/PCI bus legacy PATA
 	  ports and allows them to be accessed via the new ATA layer.
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index d8cc2e04a6c7..cdaf965fed25 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -127,3 +127,4 @@ libata-$(CONFIG_ATA_SFF)	+= libata-sff.o
 libata-$(CONFIG_SATA_PMP)	+= libata-pmp.o
 libata-$(CONFIG_ATA_ACPI)	+= libata-acpi.o
 libata-$(CONFIG_SATA_ZPODD)	+= libata-zpodd.o
+libata-$(CONFIG_PATA_TIMINGS)	+= libata-pata-timings.o
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 52d32c88b854..f88fa4db2cab 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -3216,187 +3216,7 @@ int sata_set_spd(struct ata_link *link)
 }
 EXPORT_SYMBOL_GPL(sata_set_spd);
 
-/*
- * This mode timing computation functionality is ported over from
- * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
- */
-/*
- * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
- * These were taken from ATA/ATAPI-6 standard, rev 0a, except
- * for UDMA6, which is currently supported only by Maxtor drives.
- *
- * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
- */
-
-static const struct ata_timing ata_timing[] = {
-/*	{ XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 0,  960,   0 }, */
-	{ XFER_PIO_0,     70, 290, 240, 600, 165, 150, 0,  600,   0 },
-	{ XFER_PIO_1,     50, 290,  93, 383, 125, 100, 0,  383,   0 },
-	{ XFER_PIO_2,     30, 290,  40, 330, 100,  90, 0,  240,   0 },
-	{ XFER_PIO_3,     30,  80,  70, 180,  80,  70, 0,  180,   0 },
-	{ XFER_PIO_4,     25,  70,  25, 120,  70,  25, 0,  120,   0 },
-	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 0,  100,   0 },
-	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20, 0,   80,   0 },
-
-	{ XFER_SW_DMA_0, 120,   0,   0,   0, 480, 480, 50, 960,   0 },
-	{ XFER_SW_DMA_1,  90,   0,   0,   0, 240, 240, 30, 480,   0 },
-	{ XFER_SW_DMA_2,  60,   0,   0,   0, 120, 120, 20, 240,   0 },
-
-	{ XFER_MW_DMA_0,  60,   0,   0,   0, 215, 215, 20, 480,   0 },
-	{ XFER_MW_DMA_1,  45,   0,   0,   0,  80,  50, 5,  150,   0 },
-	{ XFER_MW_DMA_2,  25,   0,   0,   0,  70,  25, 5,  120,   0 },
-	{ XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 5,  100,   0 },
-	{ XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20, 5,   80,   0 },
-
-/*	{ XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0, 0,    0, 150 }, */
-	{ XFER_UDMA_0,     0,   0,   0,   0,   0,   0, 0,    0, 120 },
-	{ XFER_UDMA_1,     0,   0,   0,   0,   0,   0, 0,    0,  80 },
-	{ XFER_UDMA_2,     0,   0,   0,   0,   0,   0, 0,    0,  60 },
-	{ XFER_UDMA_3,     0,   0,   0,   0,   0,   0, 0,    0,  45 },
-	{ XFER_UDMA_4,     0,   0,   0,   0,   0,   0, 0,    0,  30 },
-	{ XFER_UDMA_5,     0,   0,   0,   0,   0,   0, 0,    0,  20 },
-	{ XFER_UDMA_6,     0,   0,   0,   0,   0,   0, 0,    0,  15 },
-
-	{ 0xFF }
-};
-
-#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
-#define EZ(v, unit)		((v)?ENOUGH(((v) * 1000), unit):0)
-
-static void ata_timing_quantize(const struct ata_timing *t,
-				struct ata_timing *q, int T, int UT)
-{
-	q->setup	= EZ(t->setup,       T);
-	q->act8b	= EZ(t->act8b,       T);
-	q->rec8b	= EZ(t->rec8b,       T);
-	q->cyc8b	= EZ(t->cyc8b,       T);
-	q->active	= EZ(t->active,      T);
-	q->recover	= EZ(t->recover,     T);
-	q->dmack_hold	= EZ(t->dmack_hold,  T);
-	q->cycle	= EZ(t->cycle,       T);
-	q->udma		= EZ(t->udma,       UT);
-}
-
-void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
-		      struct ata_timing *m, unsigned int what)
-{
-	if (what & ATA_TIMING_SETUP)
-		m->setup = max(a->setup, b->setup);
-	if (what & ATA_TIMING_ACT8B)
-		m->act8b = max(a->act8b, b->act8b);
-	if (what & ATA_TIMING_REC8B)
-		m->rec8b = max(a->rec8b, b->rec8b);
-	if (what & ATA_TIMING_CYC8B)
-		m->cyc8b = max(a->cyc8b, b->cyc8b);
-	if (what & ATA_TIMING_ACTIVE)
-		m->active = max(a->active, b->active);
-	if (what & ATA_TIMING_RECOVER)
-		m->recover = max(a->recover, b->recover);
-	if (what & ATA_TIMING_DMACK_HOLD)
-		m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
-	if (what & ATA_TIMING_CYCLE)
-		m->cycle = max(a->cycle, b->cycle);
-	if (what & ATA_TIMING_UDMA)
-		m->udma = max(a->udma, b->udma);
-}
-EXPORT_SYMBOL_GPL(ata_timing_merge);
-
-const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
-{
-	const struct ata_timing *t = ata_timing;
-
-	while (xfer_mode > t->mode)
-		t++;
-
-	if (xfer_mode == t->mode)
-		return t;
-
-	WARN_ONCE(true, "%s: unable to find timing for xfer_mode 0x%x\n",
-			__func__, xfer_mode);
-
-	return NULL;
-}
-EXPORT_SYMBOL_GPL(ata_timing_find_mode);
-
-int ata_timing_compute(struct ata_device *adev, unsigned short speed,
-		       struct ata_timing *t, int T, int UT)
-{
-	const u16 *id = adev->id;
-	const struct ata_timing *s;
-	struct ata_timing p;
-
-	/*
-	 * Find the mode.
-	 */
-	s = ata_timing_find_mode(speed);
-	if (!s)
-		return -EINVAL;
-
-	memcpy(t, s, sizeof(*s));
-
-	/*
-	 * If the drive is an EIDE drive, it can tell us it needs extended
-	 * PIO/MW_DMA cycle timing.
-	 */
-
-	if (id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
-		memset(&p, 0, sizeof(p));
-
-		if (speed >= XFER_PIO_0 && speed < XFER_SW_DMA_0) {
-			if (speed <= XFER_PIO_2)
-				p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO];
-			else if ((speed <= XFER_PIO_4) ||
-				 (speed == XFER_PIO_5 && !ata_id_is_cfa(id)))
-				p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO_IORDY];
-		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)
-			p.cycle = id[ATA_ID_EIDE_DMA_MIN];
-
-		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
-	}
-
-	/*
-	 * Convert the timing to bus clock counts.
-	 */
-
-	ata_timing_quantize(t, t, T, UT);
-
-	/*
-	 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
-	 * S.M.A.R.T * and some other commands. We have to ensure that the
-	 * DMA cycle timing is slower/equal than the fastest PIO timing.
-	 */
-
-	if (speed > XFER_PIO_6) {
-		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
-		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
-	}
-
-	/*
-	 * Lengthen active & recovery time so that cycle time is correct.
-	 */
-
-	if (t->act8b + t->rec8b < t->cyc8b) {
-		t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
-		t->rec8b = t->cyc8b - t->act8b;
-	}
-
-	if (t->active + t->recover < t->cycle) {
-		t->active += (t->cycle - (t->active + t->recover)) / 2;
-		t->recover = t->cycle - t->active;
-	}
-
-	/*
-	 * In a few cases quantisation may produce enough errors to
-	 * leave t->cycle too low for the sum of active and recovery
-	 * if so we must correct this.
-	 */
-	if (t->active + t->recover > t->cycle)
-		t->cycle = t->active + t->recover;
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(ata_timing_compute);
-
+#ifdef CONFIG_ATA_ACPI
 /**
  *	ata_timing_cycle2mode - find xfer mode for the specified cycle duration
  *	@xfer_shift: ATA_SHIFT_* value for transfer type to examine.
@@ -3447,6 +3267,7 @@ u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
 
 	return last_mode;
 }
+#endif
 
 /**
  *	ata_down_xfermask_limit - adjust dev xfer masks downward
diff --git a/drivers/ata/libata-pata-timings.c b/drivers/ata/libata-pata-timings.c
new file mode 100644
index 000000000000..af341226cc64
--- /dev/null
+++ b/drivers/ata/libata-pata-timings.c
@@ -0,0 +1,192 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Helper library for PATA timings
+ *
+ *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
+ *  Copyright 2003-2004 Jeff Garzik
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/libata.h>
+
+/*
+ * This mode timing computation functionality is ported over from
+ * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
+ */
+/*
+ * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
+ * These were taken from ATA/ATAPI-6 standard, rev 0a, except
+ * for UDMA6, which is currently supported only by Maxtor drives.
+ *
+ * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
+ */
+
+static const struct ata_timing ata_timing[] = {
+/*	{ XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 0,  960,   0 }, */
+	{ XFER_PIO_0,     70, 290, 240, 600, 165, 150, 0,  600,   0 },
+	{ XFER_PIO_1,     50, 290,  93, 383, 125, 100, 0,  383,   0 },
+	{ XFER_PIO_2,     30, 290,  40, 330, 100,  90, 0,  240,   0 },
+	{ XFER_PIO_3,     30,  80,  70, 180,  80,  70, 0,  180,   0 },
+	{ XFER_PIO_4,     25,  70,  25, 120,  70,  25, 0,  120,   0 },
+	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 0,  100,   0 },
+	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20, 0,   80,   0 },
+
+	{ XFER_SW_DMA_0, 120,   0,   0,   0, 480, 480, 50, 960,   0 },
+	{ XFER_SW_DMA_1,  90,   0,   0,   0, 240, 240, 30, 480,   0 },
+	{ XFER_SW_DMA_2,  60,   0,   0,   0, 120, 120, 20, 240,   0 },
+
+	{ XFER_MW_DMA_0,  60,   0,   0,   0, 215, 215, 20, 480,   0 },
+	{ XFER_MW_DMA_1,  45,   0,   0,   0,  80,  50, 5,  150,   0 },
+	{ XFER_MW_DMA_2,  25,   0,   0,   0,  70,  25, 5,  120,   0 },
+	{ XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 5,  100,   0 },
+	{ XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20, 5,   80,   0 },
+
+/*	{ XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0, 0,    0, 150 }, */
+	{ XFER_UDMA_0,     0,   0,   0,   0,   0,   0, 0,    0, 120 },
+	{ XFER_UDMA_1,     0,   0,   0,   0,   0,   0, 0,    0,  80 },
+	{ XFER_UDMA_2,     0,   0,   0,   0,   0,   0, 0,    0,  60 },
+	{ XFER_UDMA_3,     0,   0,   0,   0,   0,   0, 0,    0,  45 },
+	{ XFER_UDMA_4,     0,   0,   0,   0,   0,   0, 0,    0,  30 },
+	{ XFER_UDMA_5,     0,   0,   0,   0,   0,   0, 0,    0,  20 },
+	{ XFER_UDMA_6,     0,   0,   0,   0,   0,   0, 0,    0,  15 },
+
+	{ 0xFF }
+};
+
+#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
+#define EZ(v, unit)		((v)?ENOUGH(((v) * 1000), unit):0)
+
+static void ata_timing_quantize(const struct ata_timing *t,
+				struct ata_timing *q, int T, int UT)
+{
+	q->setup	= EZ(t->setup,       T);
+	q->act8b	= EZ(t->act8b,       T);
+	q->rec8b	= EZ(t->rec8b,       T);
+	q->cyc8b	= EZ(t->cyc8b,       T);
+	q->active	= EZ(t->active,      T);
+	q->recover	= EZ(t->recover,     T);
+	q->dmack_hold	= EZ(t->dmack_hold,  T);
+	q->cycle	= EZ(t->cycle,       T);
+	q->udma		= EZ(t->udma,       UT);
+}
+
+void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
+		      struct ata_timing *m, unsigned int what)
+{
+	if (what & ATA_TIMING_SETUP)
+		m->setup = max(a->setup, b->setup);
+	if (what & ATA_TIMING_ACT8B)
+		m->act8b = max(a->act8b, b->act8b);
+	if (what & ATA_TIMING_REC8B)
+		m->rec8b = max(a->rec8b, b->rec8b);
+	if (what & ATA_TIMING_CYC8B)
+		m->cyc8b = max(a->cyc8b, b->cyc8b);
+	if (what & ATA_TIMING_ACTIVE)
+		m->active = max(a->active, b->active);
+	if (what & ATA_TIMING_RECOVER)
+		m->recover = max(a->recover, b->recover);
+	if (what & ATA_TIMING_DMACK_HOLD)
+		m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
+	if (what & ATA_TIMING_CYCLE)
+		m->cycle = max(a->cycle, b->cycle);
+	if (what & ATA_TIMING_UDMA)
+		m->udma = max(a->udma, b->udma);
+}
+EXPORT_SYMBOL_GPL(ata_timing_merge);
+
+const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
+{
+	const struct ata_timing *t = ata_timing;
+
+	while (xfer_mode > t->mode)
+		t++;
+
+	if (xfer_mode == t->mode)
+		return t;
+
+	WARN_ONCE(true, "%s: unable to find timing for xfer_mode 0x%x\n",
+			__func__, xfer_mode);
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(ata_timing_find_mode);
+
+int ata_timing_compute(struct ata_device *adev, unsigned short speed,
+		       struct ata_timing *t, int T, int UT)
+{
+	const u16 *id = adev->id;
+	const struct ata_timing *s;
+	struct ata_timing p;
+
+	/*
+	 * Find the mode.
+	 */
+	s = ata_timing_find_mode(speed);
+	if (!s)
+		return -EINVAL;
+
+	memcpy(t, s, sizeof(*s));
+
+	/*
+	 * If the drive is an EIDE drive, it can tell us it needs extended
+	 * PIO/MW_DMA cycle timing.
+	 */
+
+	if (id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
+		memset(&p, 0, sizeof(p));
+
+		if (speed >= XFER_PIO_0 && speed < XFER_SW_DMA_0) {
+			if (speed <= XFER_PIO_2)
+				p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO];
+			else if ((speed <= XFER_PIO_4) ||
+				 (speed == XFER_PIO_5 && !ata_id_is_cfa(id)))
+				p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO_IORDY];
+		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)
+			p.cycle = id[ATA_ID_EIDE_DMA_MIN];
+
+		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
+	}
+
+	/*
+	 * Convert the timing to bus clock counts.
+	 */
+
+	ata_timing_quantize(t, t, T, UT);
+
+	/*
+	 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
+	 * S.M.A.R.T * and some other commands. We have to ensure that the
+	 * DMA cycle timing is slower/equal than the fastest PIO timing.
+	 */
+
+	if (speed > XFER_PIO_6) {
+		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
+		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
+	}
+
+	/*
+	 * Lengthen active & recovery time so that cycle time is correct.
+	 */
+
+	if (t->act8b + t->rec8b < t->cyc8b) {
+		t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
+		t->rec8b = t->cyc8b - t->act8b;
+	}
+
+	if (t->active + t->recover < t->cycle) {
+		t->active += (t->cycle - (t->active + t->recover)) / 2;
+		t->recover = t->cycle - t->active;
+	}
+
+	/*
+	 * In a few cases quantisation may produce enough errors to
+	 * leave t->cycle too low for the sum of active and recovery
+	 * if so we must correct this.
+	 */
+	if (t->active + t->recover > t->cycle)
+		t->cycle = t->active + t->recover;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ata_timing_compute);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index c6d94e40ca73..9ad072b6d007 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1207,12 +1207,6 @@ extern int ata_cable_unknown(struct ata_port *ap);
 
 /* Timing helpers */
 extern unsigned int ata_pio_need_iordy(const struct ata_device *);
-extern const struct ata_timing *ata_timing_find_mode(u8 xfer_mode);
-extern int ata_timing_compute(struct ata_device *, unsigned short,
-			      struct ata_timing *, int, int);
-extern void ata_timing_merge(const struct ata_timing *,
-			     const struct ata_timing *, struct ata_timing *,
-			     unsigned int);
 extern u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle);
 
 /* PCI */
@@ -1797,6 +1791,16 @@ static inline int ata_dma_enabled(struct ata_device *adev)
 	return (adev->dma_mode == 0xFF ? 0 : 1);
 }
 
+/**************************************************************************
+ * PATA timings - drivers/ata/libata-pata-timings.c
+ */
+extern const struct ata_timing *ata_timing_find_mode(u8 xfer_mode);
+extern int ata_timing_compute(struct ata_device *, unsigned short,
+			      struct ata_timing *, int, int);
+extern void ata_timing_merge(const struct ata_timing *,
+			     const struct ata_timing *, struct ata_timing *,
+			     unsigned int);
+
 /**************************************************************************
  * PMP - drivers/ata/libata-pmp.c
  */
-- 
2.24.1

[PATCH v4 13/27] ata: add CONFIG_SATA_HOST=n version of ata_ncq_enabled()

[Bartlomiej Zolnierkiewicz]

When CONFIG_SATA_HOST=n there are no NCQ capable host drivers
built so it is safe to hardwire ata_ncq_enabled() to always
return zero.

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  37820     572      40   38432    9620 drivers/ata/libata-core.o
  21040     105     576   21721    54d9 drivers/ata/libata-scsi.o
  17405      18       0   17423    440f drivers/ata/libata-eh.o
after:
  37582     572      40   38194    9532 drivers/ata/libata-core.o
  20702     105     576   21383    5387 drivers/ata/libata-scsi.o
  17353      18       0   17371    43db drivers/ata/libata-eh.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 include/linux/libata.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 9ad072b6d007..b1b3e5e0a301 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1623,6 +1623,8 @@ extern struct ata_device *ata_dev_next(struct ata_device *dev,
  */
 static inline int ata_ncq_enabled(struct ata_device *dev)
 {
+	if (!IS_ENABLED(CONFIG_SATA_HOST))
+		return 0;
 	return (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
 			      ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ;
 }
-- 
2.24.1

[PATCH v4 14/27] ata: let compiler optimize out ata_dev_config_ncq() on non-SATA hosts

[Bartlomiej Zolnierkiewicz]

Add !IS_ENABLED(CONFIG_SATA_HOST) to ata_dev_config_ncq() to allow
compiler to optimize out the function for non-SATA configs.

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  37582     572      40   38194    9532 drivers/ata/libata-core.o
after:
  36462     572      40   37074    90d2 drivers/ata/libata-core.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index f88fa4db2cab..fa1fd0735321 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2301,6 +2301,8 @@ static int ata_dev_config_ncq(struct ata_device *dev,
 		desc[0] = '\0';
 		return 0;
 	}
+	if (!IS_ENABLED(CONFIG_SATA_HOST))
+		return 0;
 	if (dev->horkage & ATA_HORKAGE_NONCQ) {
 		snprintf(desc, desc_sz, "NCQ (not used)");
 		return 0;
-- 
2.24.1

[PATCH v4 15/27] ata: let compiler optimize out ata_eh_set_lpm() on non-SATA hosts

[Bartlomiej Zolnierkiewicz]

Add !IS_ENABLED(CONFIG_SATA_HOST) to ata_eh_set_lpm() to allow
compiler to optimize out the function for non-SATA configs (for
PATA hosts "ap && !ap->ops->set_lpm" condition is always true so
it's sufficient for the function to return zero).

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  17353      18       0   17371    43db drivers/ata/libata-eh.o
after:
  16607      18       0   16625    40f1 drivers/ata/libata-eh.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-eh.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 3b8d276b5107..452c30024f81 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -3449,7 +3449,8 @@ static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
 	int rc;
 
 	/* if the link or host doesn't do LPM, noop */
-	if ((link->flags & ATA_LFLAG_NO_LPM) || (ap && !ap->ops->set_lpm))
+	if (!IS_ENABLED(CONFIG_SATA_HOST) ||
+	    (link->flags & ATA_LFLAG_NO_LPM) || (ap && !ap->ops->set_lpm))
 		return 0;
 
 	/*
-- 
2.24.1

[PATCH v4 16/27] ata: start separating SATA specific code from libata-core.c

[Bartlomiej Zolnierkiewicz]

Start separating SATA specific code from libata-core.c:

* move following functions to libata-sata.c:
  - ata_tf_to_fis()
  - ata_tf_from_fis()
  - sata_link_scr_lpm()
  - ata_slave_link_init()
  - sata_lpm_ignore_phy_events()

* group above functions together in <linux/libata.h>

* include libata-sata.c in the build when CONFIG_SATA_HOST=y

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  37582     572      40   38194    9532 drivers/ata/libata-core.o
after:
  36762     572      40   37374    91fe drivers/ata/libata-core.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/Makefile      |   1 +
 drivers/ata/libata-core.c | 245 ------------------------------------
 drivers/ata/libata-sata.c | 258 ++++++++++++++++++++++++++++++++++++++
 include/linux/libata.h    |  16 ++-
 4 files changed, 269 insertions(+), 251 deletions(-)
 create mode 100644 drivers/ata/libata-sata.c

diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index cdaf965fed25..b8aebfb14e82 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -123,6 +123,7 @@ obj-$(CONFIG_PATA_LEGACY)	+= pata_legacy.o
 
 libata-y	:= libata-core.o libata-scsi.o libata-eh.o \
 	libata-transport.o libata-trace.o
+libata-$(CONFIG_SATA_HOST)	+= libata-sata.o
 libata-$(CONFIG_ATA_SFF)	+= libata-sff.o
 libata-$(CONFIG_SATA_PMP)	+= libata-pmp.o
 libata-$(CONFIG_ATA_ACPI)	+= libata-acpi.o
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index fa1fd0735321..270fe10468c1 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -531,81 +531,6 @@ int atapi_cmd_type(u8 opcode)
 }
 EXPORT_SYMBOL_GPL(atapi_cmd_type);
 
-/**
- *	ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
- *	@tf: Taskfile to convert
- *	@pmp: Port multiplier port
- *	@is_cmd: This FIS is for command
- *	@fis: Buffer into which data will output
- *
- *	Converts a standard ATA taskfile to a Serial ATA
- *	FIS structure (Register - Host to Device).
- *
- *	LOCKING:
- *	Inherited from caller.
- */
-void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
-{
-	fis[0] = 0x27;			/* Register - Host to Device FIS */
-	fis[1] = pmp & 0xf;		/* Port multiplier number*/
-	if (is_cmd)
-		fis[1] |= (1 << 7);	/* bit 7 indicates Command FIS */
-
-	fis[2] = tf->command;
-	fis[3] = tf->feature;
-
-	fis[4] = tf->lbal;
-	fis[5] = tf->lbam;
-	fis[6] = tf->lbah;
-	fis[7] = tf->device;
-
-	fis[8] = tf->hob_lbal;
-	fis[9] = tf->hob_lbam;
-	fis[10] = tf->hob_lbah;
-	fis[11] = tf->hob_feature;
-
-	fis[12] = tf->nsect;
-	fis[13] = tf->hob_nsect;
-	fis[14] = 0;
-	fis[15] = tf->ctl;
-
-	fis[16] = tf->auxiliary & 0xff;
-	fis[17] = (tf->auxiliary >> 8) & 0xff;
-	fis[18] = (tf->auxiliary >> 16) & 0xff;
-	fis[19] = (tf->auxiliary >> 24) & 0xff;
-}
-EXPORT_SYMBOL_GPL(ata_tf_to_fis);
-
-/**
- *	ata_tf_from_fis - Convert SATA FIS to ATA taskfile
- *	@fis: Buffer from which data will be input
- *	@tf: Taskfile to output
- *
- *	Converts a serial ATA FIS structure to a standard ATA taskfile.
- *
- *	LOCKING:
- *	Inherited from caller.
- */
-
-void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
-{
-	tf->command	= fis[2];	/* status */
-	tf->feature	= fis[3];	/* error */
-
-	tf->lbal	= fis[4];
-	tf->lbam	= fis[5];
-	tf->lbah	= fis[6];
-	tf->device	= fis[7];
-
-	tf->hob_lbal	= fis[8];
-	tf->hob_lbam	= fis[9];
-	tf->hob_lbah	= fis[10];
-
-	tf->nsect	= fis[12];
-	tf->hob_nsect	= fis[13];
-}
-EXPORT_SYMBOL_GPL(ata_tf_from_fis);
-
 static const u8 ata_rw_cmds[] = {
 	/* pio multi */
 	ATA_CMD_READ_MULTI,
@@ -3791,81 +3716,6 @@ int sata_link_resume(struct ata_link *link, const unsigned long *params,
 }
 EXPORT_SYMBOL_GPL(sata_link_resume);
 
-/**
- *	sata_link_scr_lpm - manipulate SControl IPM and SPM fields
- *	@link: ATA link to manipulate SControl for
- *	@policy: LPM policy to configure
- *	@spm_wakeup: initiate LPM transition to active state
- *
- *	Manipulate the IPM field of the SControl register of @link
- *	according to @policy.  If @policy is ATA_LPM_MAX_POWER and
- *	@spm_wakeup is %true, the SPM field is manipulated to wake up
- *	the link.  This function also clears PHYRDY_CHG before
- *	returning.
- *
- *	LOCKING:
- *	EH context.
- *
- *	RETURNS:
- *	0 on success, -errno otherwise.
- */
-int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
-		      bool spm_wakeup)
-{
-	struct ata_eh_context *ehc = &link->eh_context;
-	bool woken_up = false;
-	u32 scontrol;
-	int rc;
-
-	rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
-	if (rc)
-		return rc;
-
-	switch (policy) {
-	case ATA_LPM_MAX_POWER:
-		/* disable all LPM transitions */
-		scontrol |= (0x7 << 8);
-		/* initiate transition to active state */
-		if (spm_wakeup) {
-			scontrol |= (0x4 << 12);
-			woken_up = true;
-		}
-		break;
-	case ATA_LPM_MED_POWER:
-		/* allow LPM to PARTIAL */
-		scontrol &= ~(0x1 << 8);
-		scontrol |= (0x6 << 8);
-		break;
-	case ATA_LPM_MED_POWER_WITH_DIPM:
-	case ATA_LPM_MIN_POWER_WITH_PARTIAL:
-	case ATA_LPM_MIN_POWER:
-		if (ata_link_nr_enabled(link) > 0)
-			/* no restrictions on LPM transitions */
-			scontrol &= ~(0x7 << 8);
-		else {
-			/* empty port, power off */
-			scontrol &= ~0xf;
-			scontrol |= (0x1 << 2);
-		}
-		break;
-	default:
-		WARN_ON(1);
-	}
-
-	rc = sata_scr_write(link, SCR_CONTROL, scontrol);
-	if (rc)
-		return rc;
-
-	/* give the link time to transit out of LPM state */
-	if (woken_up)
-		msleep(10);
-
-	/* clear PHYRDY_CHG from SError */
-	ehc->i.serror &= ~SERR_PHYRDY_CHG;
-	return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
-}
-EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
-
 /**
  *	ata_std_prereset - prepare for reset
  *	@link: ATA link to be reset
@@ -6117,69 +5967,6 @@ struct ata_host *ata_host_alloc_pinfo(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
 
-/**
- *	ata_slave_link_init - initialize slave link
- *	@ap: port to initialize slave link for
- *
- *	Create and initialize slave link for @ap.  This enables slave
- *	link handling on the port.
- *
- *	In libata, a port contains links and a link contains devices.
- *	There is single host link but if a PMP is attached to it,
- *	there can be multiple fan-out links.  On SATA, there's usually
- *	a single device connected to a link but PATA and SATA
- *	controllers emulating TF based interface can have two - master
- *	and slave.
- *
- *	However, there are a few controllers which don't fit into this
- *	abstraction too well - SATA controllers which emulate TF
- *	interface with both master and slave devices but also have
- *	separate SCR register sets for each device.  These controllers
- *	need separate links for physical link handling
- *	(e.g. onlineness, link speed) but should be treated like a
- *	traditional M/S controller for everything else (e.g. command
- *	issue, softreset).
- *
- *	slave_link is libata's way of handling this class of
- *	controllers without impacting core layer too much.  For
- *	anything other than physical link handling, the default host
- *	link is used for both master and slave.  For physical link
- *	handling, separate @ap->slave_link is used.  All dirty details
- *	are implemented inside libata core layer.  From LLD's POV, the
- *	only difference is that prereset, hardreset and postreset are
- *	called once more for the slave link, so the reset sequence
- *	looks like the following.
- *
- *	prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) ->
- *	softreset(M) -> postreset(M) -> postreset(S)
- *
- *	Note that softreset is called only for the master.  Softreset
- *	resets both M/S by definition, so SRST on master should handle
- *	both (the standard method will work just fine).
- *
- *	LOCKING:
- *	Should be called before host is registered.
- *
- *	RETURNS:
- *	0 on success, -errno on failure.
- */
-int ata_slave_link_init(struct ata_port *ap)
-{
-	struct ata_link *link;
-
-	WARN_ON(ap->slave_link);
-	WARN_ON(ap->flags & ATA_FLAG_PMP);
-
-	link = kzalloc(sizeof(*link), GFP_KERNEL);
-	if (!link)
-		return -ENOMEM;
-
-	ata_link_init(ap, link, 1);
-	ap->slave_link = link;
-	return 0;
-}
-EXPORT_SYMBOL_GPL(ata_slave_link_init);
-
 static void ata_host_stop(struct device *gendev, void *res)
 {
 	struct ata_host *host = dev_get_drvdata(gendev);
@@ -7103,38 +6890,6 @@ u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
 }
 EXPORT_SYMBOL_GPL(ata_wait_register);
 
-/**
- *	sata_lpm_ignore_phy_events - test if PHY event should be ignored
- *	@link: Link receiving the event
- *
- *	Test whether the received PHY event has to be ignored or not.
- *
- *	LOCKING:
- *	None:
- *
- *	RETURNS:
- *	True if the event has to be ignored.
- */
-bool sata_lpm_ignore_phy_events(struct ata_link *link)
-{
-	unsigned long lpm_timeout = link->last_lpm_change +
-				    msecs_to_jiffies(ATA_TMOUT_SPURIOUS_PHY);
-
-	/* if LPM is enabled, PHYRDY doesn't mean anything */
-	if (link->lpm_policy > ATA_LPM_MAX_POWER)
-		return true;
-
-	/* ignore the first PHY event after the LPM policy changed
-	 * as it is might be spurious
-	 */
-	if ((link->flags & ATA_LFLAG_CHANGED) &&
-	    time_before(jiffies, lpm_timeout))
-		return true;
-
-	return false;
-}
-EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events);
-
 /*
  * Dummy port_ops
  */
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
new file mode 100644
index 000000000000..04f1ecaf414c
--- /dev/null
+++ b/drivers/ata/libata-sata.c
@@ -0,0 +1,258 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  SATA specific part of ATA helper library
+ *
+ *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
+ *  Copyright 2003-2004 Jeff Garzik
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/libata.h>
+
+#include "libata.h"
+
+/**
+ *	ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
+ *	@tf: Taskfile to convert
+ *	@pmp: Port multiplier port
+ *	@is_cmd: This FIS is for command
+ *	@fis: Buffer into which data will output
+ *
+ *	Converts a standard ATA taskfile to a Serial ATA
+ *	FIS structure (Register - Host to Device).
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
+{
+	fis[0] = 0x27;			/* Register - Host to Device FIS */
+	fis[1] = pmp & 0xf;		/* Port multiplier number*/
+	if (is_cmd)
+		fis[1] |= (1 << 7);	/* bit 7 indicates Command FIS */
+
+	fis[2] = tf->command;
+	fis[3] = tf->feature;
+
+	fis[4] = tf->lbal;
+	fis[5] = tf->lbam;
+	fis[6] = tf->lbah;
+	fis[7] = tf->device;
+
+	fis[8] = tf->hob_lbal;
+	fis[9] = tf->hob_lbam;
+	fis[10] = tf->hob_lbah;
+	fis[11] = tf->hob_feature;
+
+	fis[12] = tf->nsect;
+	fis[13] = tf->hob_nsect;
+	fis[14] = 0;
+	fis[15] = tf->ctl;
+
+	fis[16] = tf->auxiliary & 0xff;
+	fis[17] = (tf->auxiliary >> 8) & 0xff;
+	fis[18] = (tf->auxiliary >> 16) & 0xff;
+	fis[19] = (tf->auxiliary >> 24) & 0xff;
+}
+EXPORT_SYMBOL_GPL(ata_tf_to_fis);
+
+/**
+ *	ata_tf_from_fis - Convert SATA FIS to ATA taskfile
+ *	@fis: Buffer from which data will be input
+ *	@tf: Taskfile to output
+ *
+ *	Converts a serial ATA FIS structure to a standard ATA taskfile.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
+{
+	tf->command	= fis[2];	/* status */
+	tf->feature	= fis[3];	/* error */
+
+	tf->lbal	= fis[4];
+	tf->lbam	= fis[5];
+	tf->lbah	= fis[6];
+	tf->device	= fis[7];
+
+	tf->hob_lbal	= fis[8];
+	tf->hob_lbam	= fis[9];
+	tf->hob_lbah	= fis[10];
+
+	tf->nsect	= fis[12];
+	tf->hob_nsect	= fis[13];
+}
+EXPORT_SYMBOL_GPL(ata_tf_from_fis);
+
+/**
+ *	sata_link_scr_lpm - manipulate SControl IPM and SPM fields
+ *	@link: ATA link to manipulate SControl for
+ *	@policy: LPM policy to configure
+ *	@spm_wakeup: initiate LPM transition to active state
+ *
+ *	Manipulate the IPM field of the SControl register of @link
+ *	according to @policy.  If @policy is ATA_LPM_MAX_POWER and
+ *	@spm_wakeup is %true, the SPM field is manipulated to wake up
+ *	the link.  This function also clears PHYRDY_CHG before
+ *	returning.
+ *
+ *	LOCKING:
+ *	EH context.
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
+		      bool spm_wakeup)
+{
+	struct ata_eh_context *ehc = &link->eh_context;
+	bool woken_up = false;
+	u32 scontrol;
+	int rc;
+
+	rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
+	if (rc)
+		return rc;
+
+	switch (policy) {
+	case ATA_LPM_MAX_POWER:
+		/* disable all LPM transitions */
+		scontrol |= (0x7 << 8);
+		/* initiate transition to active state */
+		if (spm_wakeup) {
+			scontrol |= (0x4 << 12);
+			woken_up = true;
+		}
+		break;
+	case ATA_LPM_MED_POWER:
+		/* allow LPM to PARTIAL */
+		scontrol &= ~(0x1 << 8);
+		scontrol |= (0x6 << 8);
+		break;
+	case ATA_LPM_MED_POWER_WITH_DIPM:
+	case ATA_LPM_MIN_POWER_WITH_PARTIAL:
+	case ATA_LPM_MIN_POWER:
+		if (ata_link_nr_enabled(link) > 0)
+			/* no restrictions on LPM transitions */
+			scontrol &= ~(0x7 << 8);
+		else {
+			/* empty port, power off */
+			scontrol &= ~0xf;
+			scontrol |= (0x1 << 2);
+		}
+		break;
+	default:
+		WARN_ON(1);
+	}
+
+	rc = sata_scr_write(link, SCR_CONTROL, scontrol);
+	if (rc)
+		return rc;
+
+	/* give the link time to transit out of LPM state */
+	if (woken_up)
+		msleep(10);
+
+	/* clear PHYRDY_CHG from SError */
+	ehc->i.serror &= ~SERR_PHYRDY_CHG;
+	return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
+}
+EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
+
+/**
+ *	ata_slave_link_init - initialize slave link
+ *	@ap: port to initialize slave link for
+ *
+ *	Create and initialize slave link for @ap.  This enables slave
+ *	link handling on the port.
+ *
+ *	In libata, a port contains links and a link contains devices.
+ *	There is single host link but if a PMP is attached to it,
+ *	there can be multiple fan-out links.  On SATA, there's usually
+ *	a single device connected to a link but PATA and SATA
+ *	controllers emulating TF based interface can have two - master
+ *	and slave.
+ *
+ *	However, there are a few controllers which don't fit into this
+ *	abstraction too well - SATA controllers which emulate TF
+ *	interface with both master and slave devices but also have
+ *	separate SCR register sets for each device.  These controllers
+ *	need separate links for physical link handling
+ *	(e.g. onlineness, link speed) but should be treated like a
+ *	traditional M/S controller for everything else (e.g. command
+ *	issue, softreset).
+ *
+ *	slave_link is libata's way of handling this class of
+ *	controllers without impacting core layer too much.  For
+ *	anything other than physical link handling, the default host
+ *	link is used for both master and slave.  For physical link
+ *	handling, separate @ap->slave_link is used.  All dirty details
+ *	are implemented inside libata core layer.  From LLD's POV, the
+ *	only difference is that prereset, hardreset and postreset are
+ *	called once more for the slave link, so the reset sequence
+ *	looks like the following.
+ *
+ *	prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) ->
+ *	softreset(M) -> postreset(M) -> postreset(S)
+ *
+ *	Note that softreset is called only for the master.  Softreset
+ *	resets both M/S by definition, so SRST on master should handle
+ *	both (the standard method will work just fine).
+ *
+ *	LOCKING:
+ *	Should be called before host is registered.
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+int ata_slave_link_init(struct ata_port *ap)
+{
+	struct ata_link *link;
+
+	WARN_ON(ap->slave_link);
+	WARN_ON(ap->flags & ATA_FLAG_PMP);
+
+	link = kzalloc(sizeof(*link), GFP_KERNEL);
+	if (!link)
+		return -ENOMEM;
+
+	ata_link_init(ap, link, 1);
+	ap->slave_link = link;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ata_slave_link_init);
+
+/**
+ *	sata_lpm_ignore_phy_events - test if PHY event should be ignored
+ *	@link: Link receiving the event
+ *
+ *	Test whether the received PHY event has to be ignored or not.
+ *
+ *	LOCKING:
+ *	None:
+ *
+ *	RETURNS:
+ *	True if the event has to be ignored.
+ */
+bool sata_lpm_ignore_phy_events(struct ata_link *link)
+{
+	unsigned long lpm_timeout = link->last_lpm_change +
+				    msecs_to_jiffies(ATA_TMOUT_SPURIOUS_PHY);
+
+	/* if LPM is enabled, PHYRDY doesn't mean anything */
+	if (link->lpm_policy > ATA_LPM_MAX_POWER)
+		return true;
+
+	/* ignore the first PHY event after the LPM policy changed
+	 * as it is might be spurious
+	 */
+	if ((link->flags & ATA_LFLAG_CHANGED) &&
+	    time_before(jiffies, lpm_timeout))
+		return true;
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index b1b3e5e0a301..f38faa80b2ba 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1074,8 +1074,6 @@ extern int sata_link_debounce(struct ata_link *link,
 			const unsigned long *params, unsigned long deadline);
 extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
 			    unsigned long deadline);
-extern int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
-			     bool spm_wakeup);
 extern int sata_link_hardreset(struct ata_link *link,
 			const unsigned long *timing, unsigned long deadline,
 			bool *online, int (*check_ready)(struct ata_link *));
@@ -1086,7 +1084,6 @@ extern void ata_std_postreset(struct ata_link *link, unsigned int *classes);
 extern struct ata_host *ata_host_alloc(struct device *dev, int max_ports);
 extern struct ata_host *ata_host_alloc_pinfo(struct device *dev,
 			const struct ata_port_info * const * ppi, int n_ports);
-extern int ata_slave_link_init(struct ata_port *ap);
 extern void ata_host_get(struct ata_host *host);
 extern void ata_host_put(struct ata_host *host);
 extern int ata_host_start(struct ata_host *host);
@@ -1146,9 +1143,6 @@ extern void ata_msleep(struct ata_port *ap, unsigned int msecs);
 extern u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask,
 			u32 val, unsigned long interval, unsigned long timeout);
 extern int atapi_cmd_type(u8 opcode);
-extern void ata_tf_to_fis(const struct ata_taskfile *tf,
-			  u8 pmp, int is_cmd, u8 *fis);
-extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
 extern unsigned long ata_pack_xfermask(unsigned long pio_mask,
 			unsigned long mwdma_mask, unsigned long udma_mask);
 extern void ata_unpack_xfermask(unsigned long xfer_mask,
@@ -1197,6 +1191,16 @@ extern void ata_scsi_port_error_handler(struct Scsi_Host *host,
 extern void ata_scsi_cmd_error_handler(struct Scsi_Host *host,
 				       struct ata_port *ap,
 				       struct list_head *eh_q);
+
+/*
+ * SATA specific code - drivers/ata/libata-sata.c
+ */
+extern int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
+                            bool spm_wakeup);
+extern int ata_slave_link_init(struct ata_port *ap);
+extern void ata_tf_to_fis(const struct ata_taskfile *tf,
+                         u8 pmp, int is_cmd, u8 *fis);
+extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
 extern bool sata_lpm_ignore_phy_events(struct ata_link *link);
 
 extern int ata_cable_40wire(struct ata_port *ap);
-- 
2.24.1

[PATCH v4 17/27] ata: move sata_scr_*() to libata-sata.c

[Bartlomiej Zolnierkiewicz]

* move sata_scr_*() to libata-sata.c

* add static inlines for CONFIG_SATA_HOST=n case

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  35642     572      40   36254    8d9e drivers/ata/libata-core.o
  16607      18       0   16625    40f1 drivers/ata/libata-eh.o
after:
  32846     572      40   33458    82b2 drivers/ata/libata-core.o
  16243      18       0   16261    3f85 drivers/ata/libata-eh.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-core.c | 109 --------------------------------------
 drivers/ata/libata-sata.c | 109 ++++++++++++++++++++++++++++++++++++++
 include/linux/libata.h    |  24 +++++++--
 3 files changed, 129 insertions(+), 113 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 270fe10468c1..099d776289d7 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5220,115 +5220,6 @@ void ata_qc_issue(struct ata_queued_cmd *qc)
 	ata_qc_complete(qc);
 }
 
-/**
- *	sata_scr_valid - test whether SCRs are accessible
- *	@link: ATA link to test SCR accessibility for
- *
- *	Test whether SCRs are accessible for @link.
- *
- *	LOCKING:
- *	None.
- *
- *	RETURNS:
- *	1 if SCRs are accessible, 0 otherwise.
- */
-int sata_scr_valid(struct ata_link *link)
-{
-	struct ata_port *ap = link->ap;
-
-	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
-}
-EXPORT_SYMBOL_GPL(sata_scr_valid);
-
-/**
- *	sata_scr_read - read SCR register of the specified port
- *	@link: ATA link to read SCR for
- *	@reg: SCR to read
- *	@val: Place to store read value
- *
- *	Read SCR register @reg of @link into *@val.  This function is
- *	guaranteed to succeed if @link is ap->link, the cable type of
- *	the port is SATA and the port implements ->scr_read.
- *
- *	LOCKING:
- *	None if @link is ap->link.  Kernel thread context otherwise.
- *
- *	RETURNS:
- *	0 on success, negative errno on failure.
- */
-int sata_scr_read(struct ata_link *link, int reg, u32 *val)
-{
-	if (ata_is_host_link(link)) {
-		if (sata_scr_valid(link))
-			return link->ap->ops->scr_read(link, reg, val);
-		return -EOPNOTSUPP;
-	}
-
-	return sata_pmp_scr_read(link, reg, val);
-}
-EXPORT_SYMBOL_GPL(sata_scr_read);
-
-/**
- *	sata_scr_write - write SCR register of the specified port
- *	@link: ATA link to write SCR for
- *	@reg: SCR to write
- *	@val: value to write
- *
- *	Write @val to SCR register @reg of @link.  This function is
- *	guaranteed to succeed if @link is ap->link, the cable type of
- *	the port is SATA and the port implements ->scr_read.
- *
- *	LOCKING:
- *	None if @link is ap->link.  Kernel thread context otherwise.
- *
- *	RETURNS:
- *	0 on success, negative errno on failure.
- */
-int sata_scr_write(struct ata_link *link, int reg, u32 val)
-{
-	if (ata_is_host_link(link)) {
-		if (sata_scr_valid(link))
-			return link->ap->ops->scr_write(link, reg, val);
-		return -EOPNOTSUPP;
-	}
-
-	return sata_pmp_scr_write(link, reg, val);
-}
-EXPORT_SYMBOL_GPL(sata_scr_write);
-
-/**
- *	sata_scr_write_flush - write SCR register of the specified port and flush
- *	@link: ATA link to write SCR for
- *	@reg: SCR to write
- *	@val: value to write
- *
- *	This function is identical to sata_scr_write() except that this
- *	function performs flush after writing to the register.
- *
- *	LOCKING:
- *	None if @link is ap->link.  Kernel thread context otherwise.
- *
- *	RETURNS:
- *	0 on success, negative errno on failure.
- */
-int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
-{
-	if (ata_is_host_link(link)) {
-		int rc;
-
-		if (sata_scr_valid(link)) {
-			rc = link->ap->ops->scr_write(link, reg, val);
-			if (rc == 0)
-				rc = link->ap->ops->scr_read(link, reg, &val);
-			return rc;
-		}
-		return -EOPNOTSUPP;
-	}
-
-	return sata_pmp_scr_write(link, reg, val);
-}
-EXPORT_SYMBOL_GPL(sata_scr_write_flush);
-
 /**
  *	ata_phys_link_online - test whether the given link is online
  *	@link: ATA link to test
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index 04f1ecaf414c..1ef4c19864ac 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -12,6 +12,115 @@
 
 #include "libata.h"
 
+/**
+ *	sata_scr_valid - test whether SCRs are accessible
+ *	@link: ATA link to test SCR accessibility for
+ *
+ *	Test whether SCRs are accessible for @link.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	1 if SCRs are accessible, 0 otherwise.
+ */
+int sata_scr_valid(struct ata_link *link)
+{
+	struct ata_port *ap = link->ap;
+
+	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
+}
+EXPORT_SYMBOL_GPL(sata_scr_valid);
+
+/**
+ *	sata_scr_read - read SCR register of the specified port
+ *	@link: ATA link to read SCR for
+ *	@reg: SCR to read
+ *	@val: Place to store read value
+ *
+ *	Read SCR register @reg of @link into *@val.  This function is
+ *	guaranteed to succeed if @link is ap->link, the cable type of
+ *	the port is SATA and the port implements ->scr_read.
+ *
+ *	LOCKING:
+ *	None if @link is ap->link.  Kernel thread context otherwise.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure.
+ */
+int sata_scr_read(struct ata_link *link, int reg, u32 *val)
+{
+	if (ata_is_host_link(link)) {
+		if (sata_scr_valid(link))
+			return link->ap->ops->scr_read(link, reg, val);
+		return -EOPNOTSUPP;
+	}
+
+	return sata_pmp_scr_read(link, reg, val);
+}
+EXPORT_SYMBOL_GPL(sata_scr_read);
+
+/**
+ *	sata_scr_write - write SCR register of the specified port
+ *	@link: ATA link to write SCR for
+ *	@reg: SCR to write
+ *	@val: value to write
+ *
+ *	Write @val to SCR register @reg of @link.  This function is
+ *	guaranteed to succeed if @link is ap->link, the cable type of
+ *	the port is SATA and the port implements ->scr_read.
+ *
+ *	LOCKING:
+ *	None if @link is ap->link.  Kernel thread context otherwise.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure.
+ */
+int sata_scr_write(struct ata_link *link, int reg, u32 val)
+{
+	if (ata_is_host_link(link)) {
+		if (sata_scr_valid(link))
+			return link->ap->ops->scr_write(link, reg, val);
+		return -EOPNOTSUPP;
+	}
+
+	return sata_pmp_scr_write(link, reg, val);
+}
+EXPORT_SYMBOL_GPL(sata_scr_write);
+
+/**
+ *	sata_scr_write_flush - write SCR register of the specified port and flush
+ *	@link: ATA link to write SCR for
+ *	@reg: SCR to write
+ *	@val: value to write
+ *
+ *	This function is identical to sata_scr_write() except that this
+ *	function performs flush after writing to the register.
+ *
+ *	LOCKING:
+ *	None if @link is ap->link.  Kernel thread context otherwise.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure.
+ */
+int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
+{
+	if (ata_is_host_link(link)) {
+		int rc;
+
+		if (sata_scr_valid(link)) {
+			rc = link->ap->ops->scr_write(link, reg, val);
+			if (rc == 0)
+				rc = link->ap->ops->scr_read(link, reg, &val);
+			return rc;
+		}
+		return -EOPNOTSUPP;
+	}
+
+	return sata_pmp_scr_write(link, reg, val);
+}
+EXPORT_SYMBOL_GPL(sata_scr_write_flush);
+
 /**
  *	ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
  *	@tf: Taskfile to convert
diff --git a/include/linux/libata.h b/include/linux/libata.h
index f38faa80b2ba..6848e2403d4f 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1119,10 +1119,6 @@ extern void ata_sas_tport_delete(struct ata_port *ap);
 extern void ata_sas_port_stop(struct ata_port *ap);
 extern int ata_sas_slave_configure(struct scsi_device *, struct ata_port *);
 extern int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap);
-extern int sata_scr_valid(struct ata_link *link);
-extern int sata_scr_read(struct ata_link *link, int reg, u32 *val);
-extern int sata_scr_write(struct ata_link *link, int reg, u32 val);
-extern int sata_scr_write_flush(struct ata_link *link, int reg, u32 val);
 extern bool ata_link_online(struct ata_link *link);
 extern bool ata_link_offline(struct ata_link *link);
 #ifdef CONFIG_PM
@@ -1195,6 +1191,26 @@ extern void ata_scsi_cmd_error_handler(struct Scsi_Host *host,
 /*
  * SATA specific code - drivers/ata/libata-sata.c
  */
+#ifdef CONFIG_SATA_HOST
+extern int sata_scr_valid(struct ata_link *link);
+extern int sata_scr_read(struct ata_link *link, int reg, u32 *val);
+extern int sata_scr_write(struct ata_link *link, int reg, u32 val);
+extern int sata_scr_write_flush(struct ata_link *link, int reg, u32 val);
+#else
+static inline int sata_scr_valid(struct ata_link *link) { return 0; }
+static inline int sata_scr_read(struct ata_link *link, int reg, u32 *val)
+{
+	return -EOPNOTSUPP;
+}
+static inline int sata_scr_write(struct ata_link *link, int reg, u32 val)
+{
+	return -EOPNOTSUPP;
+}
+static inline int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
+{
+	return -EOPNOTSUPP;
+}
+#endif
 extern int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
                             bool spm_wakeup);
 extern int ata_slave_link_init(struct ata_port *ap);
-- 
2.24.1

[PATCH v4 18/27] ata: move *sata_set_spd*() to libata-sata.c

[Bartlomiej Zolnierkiewicz]

* move *sata_set_spd*() to libata-sata.c

* add static inlines for CONFIG_SATA_HOST=n case

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  32842     572      40   33458    82ae drivers/ata/libata-core.o
after:
  32812     572      40   33428    8290 drivers/ata/libata-core.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-core.c | 81 ---------------------------------------
 drivers/ata/libata-sata.c | 81 +++++++++++++++++++++++++++++++++++++++
 drivers/ata/libata.h      |  7 ++++
 include/linux/libata.h    |  3 +-
 4 files changed, 90 insertions(+), 82 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 099d776289d7..37de14e6224f 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -3062,87 +3062,6 @@ int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
 	return 0;
 }
 
-static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
-{
-	struct ata_link *host_link = &link->ap->link;
-	u32 limit, target, spd;
-
-	limit = link->sata_spd_limit;
-
-	/* Don't configure downstream link faster than upstream link.
-	 * It doesn't speed up anything and some PMPs choke on such
-	 * configuration.
-	 */
-	if (!ata_is_host_link(link) && host_link->sata_spd)
-		limit &= (1 << host_link->sata_spd) - 1;
-
-	if (limit == UINT_MAX)
-		target = 0;
-	else
-		target = fls(limit);
-
-	spd = (*scontrol >> 4) & 0xf;
-	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
-
-	return spd != target;
-}
-
-/**
- *	sata_set_spd_needed - is SATA spd configuration needed
- *	@link: Link in question
- *
- *	Test whether the spd limit in SControl matches
- *	@link->sata_spd_limit.  This function is used to determine
- *	whether hardreset is necessary to apply SATA spd
- *	configuration.
- *
- *	LOCKING:
- *	Inherited from caller.
- *
- *	RETURNS:
- *	1 if SATA spd configuration is needed, 0 otherwise.
- */
-static int sata_set_spd_needed(struct ata_link *link)
-{
-	u32 scontrol;
-
-	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
-		return 1;
-
-	return __sata_set_spd_needed(link, &scontrol);
-}
-
-/**
- *	sata_set_spd - set SATA spd according to spd limit
- *	@link: Link to set SATA spd for
- *
- *	Set SATA spd of @link according to sata_spd_limit.
- *
- *	LOCKING:
- *	Inherited from caller.
- *
- *	RETURNS:
- *	0 if spd doesn't need to be changed, 1 if spd has been
- *	changed.  Negative errno if SCR registers are inaccessible.
- */
-int sata_set_spd(struct ata_link *link)
-{
-	u32 scontrol;
-	int rc;
-
-	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
-		return rc;
-
-	if (!__sata_set_spd_needed(link, &scontrol))
-		return 0;
-
-	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
-		return rc;
-
-	return 1;
-}
-EXPORT_SYMBOL_GPL(sata_set_spd);
-
 #ifdef CONFIG_ATA_ACPI
 /**
  *	ata_timing_cycle2mode - find xfer mode for the specified cycle duration
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index 1ef4c19864ac..d66afdc33d54 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -271,6 +271,87 @@ int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
 }
 EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
 
+static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
+{
+	struct ata_link *host_link = &link->ap->link;
+	u32 limit, target, spd;
+
+	limit = link->sata_spd_limit;
+
+	/* Don't configure downstream link faster than upstream link.
+	 * It doesn't speed up anything and some PMPs choke on such
+	 * configuration.
+	 */
+	if (!ata_is_host_link(link) && host_link->sata_spd)
+		limit &= (1 << host_link->sata_spd) - 1;
+
+	if (limit == UINT_MAX)
+		target = 0;
+	else
+		target = fls(limit);
+
+	spd = (*scontrol >> 4) & 0xf;
+	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
+
+	return spd != target;
+}
+
+/**
+ *	sata_set_spd_needed - is SATA spd configuration needed
+ *	@link: Link in question
+ *
+ *	Test whether the spd limit in SControl matches
+ *	@link->sata_spd_limit.  This function is used to determine
+ *	whether hardreset is necessary to apply SATA spd
+ *	configuration.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	1 if SATA spd configuration is needed, 0 otherwise.
+ */
+int sata_set_spd_needed(struct ata_link *link)
+{
+	u32 scontrol;
+
+	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
+		return 1;
+
+	return __sata_set_spd_needed(link, &scontrol);
+}
+
+/**
+ *	sata_set_spd - set SATA spd according to spd limit
+ *	@link: Link to set SATA spd for
+ *
+ *	Set SATA spd of @link according to sata_spd_limit.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	0 if spd doesn't need to be changed, 1 if spd has been
+ *	changed.  Negative errno if SCR registers are inaccessible.
+ */
+int sata_set_spd(struct ata_link *link)
+{
+	u32 scontrol;
+	int rc;
+
+	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
+		return rc;
+
+	if (!__sata_set_spd_needed(link, &scontrol))
+		return 0;
+
+	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
+		return rc;
+
+	return 1;
+}
+EXPORT_SYMBOL_GPL(sata_set_spd);
+
 /**
  *	ata_slave_link_init - initialize slave link
  *	@ap: port to initialize slave link for
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index cd8090ad43e5..53b45ebe3d55 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -87,6 +87,13 @@ extern unsigned int ata_read_log_page(struct ata_device *dev, u8 log,
 
 #define to_ata_port(d) container_of(d, struct ata_port, tdev)
 
+/* libata-sata.c */
+#ifdef CONFIG_SATA_HOST
+int sata_set_spd_needed(struct ata_link *link);
+#else
+static inline int sata_set_spd_needed(struct ata_link *link) { return 1; }
+#endif
+
 /* libata-acpi.c */
 #ifdef CONFIG_ATA_ACPI
 extern unsigned int ata_acpi_gtf_filter;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 6848e2403d4f..246696cafc4c 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1066,7 +1066,6 @@ static inline int ata_port_is_dummy(struct ata_port *ap)
 	return ap->ops == &ata_dummy_port_ops;
 }
 
-extern int sata_set_spd(struct ata_link *link);
 extern int ata_std_prereset(struct ata_link *link, unsigned long deadline);
 extern int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
 				int (*check_ready)(struct ata_link *link));
@@ -1196,6 +1195,7 @@ extern int sata_scr_valid(struct ata_link *link);
 extern int sata_scr_read(struct ata_link *link, int reg, u32 *val);
 extern int sata_scr_write(struct ata_link *link, int reg, u32 val);
 extern int sata_scr_write_flush(struct ata_link *link, int reg, u32 val);
+extern int sata_set_spd(struct ata_link *link);
 #else
 static inline int sata_scr_valid(struct ata_link *link) { return 0; }
 static inline int sata_scr_read(struct ata_link *link, int reg, u32 *val)
@@ -1210,6 +1210,7 @@ static inline int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
 {
 	return -EOPNOTSUPP;
 }
+static inline int sata_set_spd(struct ata_link *link) { return -EOPNOTSUPP; }
 #endif
 extern int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
                             bool spm_wakeup);
-- 
2.24.1

[PATCH v4 19/27] ata: move sata_link_{debounce,resume}() to libata-sata.c

[Bartlomiej Zolnierkiewicz]

* move sata_link_{debounce,resume}() to libata-sata.c

* add static inline for CONFIG_SATA_HOST=n case (only one,
  for sata_link_resume() is needed)

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  32816     572      40   33428    8294 drivers/ata/libata-core.o
after:
  32724     572      40   33336    8238 drivers/ata/libata-core.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-core.c | 138 --------------------------------------
 drivers/ata/libata-sata.c | 138 ++++++++++++++++++++++++++++++++++++++
 include/linux/libata.h    |  14 ++--
 3 files changed, 148 insertions(+), 142 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 37de14e6224f..9c4c7f6d90fc 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -3497,144 +3497,6 @@ int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
 }
 EXPORT_SYMBOL_GPL(ata_wait_after_reset);
 
-/**
- *	sata_link_debounce - debounce SATA phy status
- *	@link: ATA link to debounce SATA phy status for
- *	@params: timing parameters { interval, duration, timeout } in msec
- *	@deadline: deadline jiffies for the operation
- *
- *	Make sure SStatus of @link reaches stable state, determined by
- *	holding the same value where DET is not 1 for @duration polled
- *	every @interval, before @timeout.  Timeout constraints the
- *	beginning of the stable state.  Because DET gets stuck at 1 on
- *	some controllers after hot unplugging, this functions waits
- *	until timeout then returns 0 if DET is stable at 1.
- *
- *	@timeout is further limited by @deadline.  The sooner of the
- *	two is used.
- *
- *	LOCKING:
- *	Kernel thread context (may sleep)
- *
- *	RETURNS:
- *	0 on success, -errno on failure.
- */
-int sata_link_debounce(struct ata_link *link, const unsigned long *params,
-		       unsigned long deadline)
-{
-	unsigned long interval = params[0];
-	unsigned long duration = params[1];
-	unsigned long last_jiffies, t;
-	u32 last, cur;
-	int rc;
-
-	t = ata_deadline(jiffies, params[2]);
-	if (time_before(t, deadline))
-		deadline = t;
-
-	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
-		return rc;
-	cur &= 0xf;
-
-	last = cur;
-	last_jiffies = jiffies;
-
-	while (1) {
-		ata_msleep(link->ap, interval);
-		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
-			return rc;
-		cur &= 0xf;
-
-		/* DET stable? */
-		if (cur == last) {
-			if (cur == 1 && time_before(jiffies, deadline))
-				continue;
-			if (time_after(jiffies,
-				       ata_deadline(last_jiffies, duration)))
-				return 0;
-			continue;
-		}
-
-		/* unstable, start over */
-		last = cur;
-		last_jiffies = jiffies;
-
-		/* Check deadline.  If debouncing failed, return
-		 * -EPIPE to tell upper layer to lower link speed.
-		 */
-		if (time_after(jiffies, deadline))
-			return -EPIPE;
-	}
-}
-EXPORT_SYMBOL_GPL(sata_link_debounce);
-
-/**
- *	sata_link_resume - resume SATA link
- *	@link: ATA link to resume SATA
- *	@params: timing parameters { interval, duration, timeout } in msec
- *	@deadline: deadline jiffies for the operation
- *
- *	Resume SATA phy @link and debounce it.
- *
- *	LOCKING:
- *	Kernel thread context (may sleep)
- *
- *	RETURNS:
- *	0 on success, -errno on failure.
- */
-int sata_link_resume(struct ata_link *link, const unsigned long *params,
-		     unsigned long deadline)
-{
-	int tries = ATA_LINK_RESUME_TRIES;
-	u32 scontrol, serror;
-	int rc;
-
-	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
-		return rc;
-
-	/*
-	 * Writes to SControl sometimes get ignored under certain
-	 * controllers (ata_piix SIDPR).  Make sure DET actually is
-	 * cleared.
-	 */
-	do {
-		scontrol = (scontrol & 0x0f0) | 0x300;
-		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
-			return rc;
-		/*
-		 * Some PHYs react badly if SStatus is pounded
-		 * immediately after resuming.  Delay 200ms before
-		 * debouncing.
-		 */
-		if (!(link->flags & ATA_LFLAG_NO_DB_DELAY))
-			ata_msleep(link->ap, 200);
-
-		/* is SControl restored correctly? */
-		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
-			return rc;
-	} while ((scontrol & 0xf0f) != 0x300 && --tries);
-
-	if ((scontrol & 0xf0f) != 0x300) {
-		ata_link_warn(link, "failed to resume link (SControl %X)\n",
-			     scontrol);
-		return 0;
-	}
-
-	if (tries < ATA_LINK_RESUME_TRIES)
-		ata_link_warn(link, "link resume succeeded after %d retries\n",
-			      ATA_LINK_RESUME_TRIES - tries);
-
-	if ((rc = sata_link_debounce(link, params, deadline)))
-		return rc;
-
-	/* clear SError, some PHYs require this even for SRST to work */
-	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
-		rc = sata_scr_write(link, SCR_ERROR, serror);
-
-	return rc != -EINVAL ? rc : 0;
-}
-EXPORT_SYMBOL_GPL(sata_link_resume);
-
 /**
  *	ata_std_prereset - prepare for reset
  *	@link: ATA link to be reset
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index d66afdc33d54..34852fced999 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -196,6 +196,144 @@ void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
 }
 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
 
+/**
+ *	sata_link_debounce - debounce SATA phy status
+ *	@link: ATA link to debounce SATA phy status for
+ *	@params: timing parameters { interval, duration, timeout } in msec
+ *	@deadline: deadline jiffies for the operation
+ *
+ *	Make sure SStatus of @link reaches stable state, determined by
+ *	holding the same value where DET is not 1 for @duration polled
+ *	every @interval, before @timeout.  Timeout constraints the
+ *	beginning of the stable state.  Because DET gets stuck at 1 on
+ *	some controllers after hot unplugging, this functions waits
+ *	until timeout then returns 0 if DET is stable at 1.
+ *
+ *	@timeout is further limited by @deadline.  The sooner of the
+ *	two is used.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+int sata_link_debounce(struct ata_link *link, const unsigned long *params,
+		       unsigned long deadline)
+{
+	unsigned long interval = params[0];
+	unsigned long duration = params[1];
+	unsigned long last_jiffies, t;
+	u32 last, cur;
+	int rc;
+
+	t = ata_deadline(jiffies, params[2]);
+	if (time_before(t, deadline))
+		deadline = t;
+
+	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
+		return rc;
+	cur &= 0xf;
+
+	last = cur;
+	last_jiffies = jiffies;
+
+	while (1) {
+		ata_msleep(link->ap, interval);
+		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
+			return rc;
+		cur &= 0xf;
+
+		/* DET stable? */
+		if (cur == last) {
+			if (cur == 1 && time_before(jiffies, deadline))
+				continue;
+			if (time_after(jiffies,
+				       ata_deadline(last_jiffies, duration)))
+				return 0;
+			continue;
+		}
+
+		/* unstable, start over */
+		last = cur;
+		last_jiffies = jiffies;
+
+		/* Check deadline.  If debouncing failed, return
+		 * -EPIPE to tell upper layer to lower link speed.
+		 */
+		if (time_after(jiffies, deadline))
+			return -EPIPE;
+	}
+}
+EXPORT_SYMBOL_GPL(sata_link_debounce);
+
+/**
+ *	sata_link_resume - resume SATA link
+ *	@link: ATA link to resume SATA
+ *	@params: timing parameters { interval, duration, timeout } in msec
+ *	@deadline: deadline jiffies for the operation
+ *
+ *	Resume SATA phy @link and debounce it.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+int sata_link_resume(struct ata_link *link, const unsigned long *params,
+		     unsigned long deadline)
+{
+	int tries = ATA_LINK_RESUME_TRIES;
+	u32 scontrol, serror;
+	int rc;
+
+	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
+		return rc;
+
+	/*
+	 * Writes to SControl sometimes get ignored under certain
+	 * controllers (ata_piix SIDPR).  Make sure DET actually is
+	 * cleared.
+	 */
+	do {
+		scontrol = (scontrol & 0x0f0) | 0x300;
+		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
+			return rc;
+		/*
+		 * Some PHYs react badly if SStatus is pounded
+		 * immediately after resuming.  Delay 200ms before
+		 * debouncing.
+		 */
+		if (!(link->flags & ATA_LFLAG_NO_DB_DELAY))
+			ata_msleep(link->ap, 200);
+
+		/* is SControl restored correctly? */
+		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
+			return rc;
+	} while ((scontrol & 0xf0f) != 0x300 && --tries);
+
+	if ((scontrol & 0xf0f) != 0x300) {
+		ata_link_warn(link, "failed to resume link (SControl %X)\n",
+			     scontrol);
+		return 0;
+	}
+
+	if (tries < ATA_LINK_RESUME_TRIES)
+		ata_link_warn(link, "link resume succeeded after %d retries\n",
+			      ATA_LINK_RESUME_TRIES - tries);
+
+	if ((rc = sata_link_debounce(link, params, deadline)))
+		return rc;
+
+	/* clear SError, some PHYs require this even for SRST to work */
+	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
+		rc = sata_scr_write(link, SCR_ERROR, serror);
+
+	return rc != -EINVAL ? rc : 0;
+}
+EXPORT_SYMBOL_GPL(sata_link_resume);
+
 /**
  *	sata_link_scr_lpm - manipulate SControl IPM and SPM fields
  *	@link: ATA link to manipulate SControl for
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 246696cafc4c..f67a7bbb3c35 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1069,10 +1069,6 @@ static inline int ata_port_is_dummy(struct ata_port *ap)
 extern int ata_std_prereset(struct ata_link *link, unsigned long deadline);
 extern int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
 				int (*check_ready)(struct ata_link *link));
-extern int sata_link_debounce(struct ata_link *link,
-			const unsigned long *params, unsigned long deadline);
-extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
-			    unsigned long deadline);
 extern int sata_link_hardreset(struct ata_link *link,
 			const unsigned long *timing, unsigned long deadline,
 			bool *online, int (*check_ready)(struct ata_link *));
@@ -1196,6 +1192,8 @@ extern int sata_scr_read(struct ata_link *link, int reg, u32 *val);
 extern int sata_scr_write(struct ata_link *link, int reg, u32 val);
 extern int sata_scr_write_flush(struct ata_link *link, int reg, u32 val);
 extern int sata_set_spd(struct ata_link *link);
+extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
+			    unsigned long deadline);
 #else
 static inline int sata_scr_valid(struct ata_link *link) { return 0; }
 static inline int sata_scr_read(struct ata_link *link, int reg, u32 *val)
@@ -1211,7 +1209,15 @@ static inline int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
 	return -EOPNOTSUPP;
 }
 static inline int sata_set_spd(struct ata_link *link) { return -EOPNOTSUPP; }
+static inline int sata_link_resume(struct ata_link *link,
+				   const unsigned long *params,
+				   unsigned long deadline)
+{
+	return -EOPNOTSUPP;
+}
 #endif
+extern int sata_link_debounce(struct ata_link *link,
+			const unsigned long *params, unsigned long deadline);
 extern int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
                             bool spm_wakeup);
 extern int ata_slave_link_init(struct ata_port *ap);
-- 
2.24.1

[PATCH v4 20/27] ata: move sata_link_hardreset() to libata-sata.c

[Bartlomiej Zolnierkiewicz]

* move sata_link_hardreset() to libata-sata.c

* add static inline for CONFIG_SATA_HOST=n case

* make sata_set_spd_needed() static

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  32724     572      40   33336    8238 drivers/ata/libata-core.o
after:
  32559     572      40   33171    8193 drivers/ata/libata-core.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-core.c | 110 -------------------------------------
 drivers/ata/libata-sata.c | 112 +++++++++++++++++++++++++++++++++++++-
 drivers/ata/libata.h      |   7 ---
 include/linux/libata.h    |  16 +++++-
 4 files changed, 124 insertions(+), 121 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 9c4c7f6d90fc..1879072419fe 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -3543,116 +3543,6 @@ int ata_std_prereset(struct ata_link *link, unsigned long deadline)
 }
 EXPORT_SYMBOL_GPL(ata_std_prereset);
 
-/**
- *	sata_link_hardreset - reset link via SATA phy reset
- *	@link: link to reset
- *	@timing: timing parameters { interval, duration, timeout } in msec
- *	@deadline: deadline jiffies for the operation
- *	@online: optional out parameter indicating link onlineness
- *	@check_ready: optional callback to check link readiness
- *
- *	SATA phy-reset @link using DET bits of SControl register.
- *	After hardreset, link readiness is waited upon using
- *	ata_wait_ready() if @check_ready is specified.  LLDs are
- *	allowed to not specify @check_ready and wait itself after this
- *	function returns.  Device classification is LLD's
- *	responsibility.
- *
- *	*@online is set to one iff reset succeeded and @link is online
- *	after reset.
- *
- *	LOCKING:
- *	Kernel thread context (may sleep)
- *
- *	RETURNS:
- *	0 on success, -errno otherwise.
- */
-int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
-			unsigned long deadline,
-			bool *online, int (*check_ready)(struct ata_link *))
-{
-	u32 scontrol;
-	int rc;
-
-	if (online)
-		*online = false;
-
-	if (sata_set_spd_needed(link)) {
-		/* SATA spec says nothing about how to reconfigure
-		 * spd.  To be on the safe side, turn off phy during
-		 * reconfiguration.  This works for at least ICH7 AHCI
-		 * and Sil3124.
-		 */
-		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
-			goto out;
-
-		scontrol = (scontrol & 0x0f0) | 0x304;
-
-		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
-			goto out;
-
-		sata_set_spd(link);
-	}
-
-	/* issue phy wake/reset */
-	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
-		goto out;
-
-	scontrol = (scontrol & 0x0f0) | 0x301;
-
-	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
-		goto out;
-
-	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
-	 * 10.4.2 says at least 1 ms.
-	 */
-	ata_msleep(link->ap, 1);
-
-	/* bring link back */
-	rc = sata_link_resume(link, timing, deadline);
-	if (rc)
-		goto out;
-	/* if link is offline nothing more to do */
-	if (ata_phys_link_offline(link))
-		goto out;
-
-	/* Link is online.  From this point, -ENODEV too is an error. */
-	if (online)
-		*online = true;
-
-	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
-		/* If PMP is supported, we have to do follow-up SRST.
-		 * Some PMPs don't send D2H Reg FIS after hardreset if
-		 * the first port is empty.  Wait only for
-		 * ATA_TMOUT_PMP_SRST_WAIT.
-		 */
-		if (check_ready) {
-			unsigned long pmp_deadline;
-
-			pmp_deadline = ata_deadline(jiffies,
-						    ATA_TMOUT_PMP_SRST_WAIT);
-			if (time_after(pmp_deadline, deadline))
-				pmp_deadline = deadline;
-			ata_wait_ready(link, pmp_deadline, check_ready);
-		}
-		rc = -EAGAIN;
-		goto out;
-	}
-
-	rc = 0;
-	if (check_ready)
-		rc = ata_wait_ready(link, deadline, check_ready);
- out:
-	if (rc && rc != -EAGAIN) {
-		/* online is set iff link is online && reset succeeded */
-		if (online)
-			*online = false;
-		ata_link_err(link, "COMRESET failed (errno=%d)\n", rc);
-	}
-	return rc;
-}
-EXPORT_SYMBOL_GPL(sata_link_hardreset);
-
 /**
  *	sata_std_hardreset - COMRESET w/o waiting or classification
  *	@link: link to reset
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index 34852fced999..ccd60f71ca31 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -449,7 +449,7 @@ static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
  *	RETURNS:
  *	1 if SATA spd configuration is needed, 0 otherwise.
  */
-int sata_set_spd_needed(struct ata_link *link)
+static int sata_set_spd_needed(struct ata_link *link)
 {
 	u32 scontrol;
 
@@ -490,6 +490,116 @@ int sata_set_spd(struct ata_link *link)
 }
 EXPORT_SYMBOL_GPL(sata_set_spd);
 
+/**
+ *	sata_link_hardreset - reset link via SATA phy reset
+ *	@link: link to reset
+ *	@timing: timing parameters { interval, duration, timeout } in msec
+ *	@deadline: deadline jiffies for the operation
+ *	@online: optional out parameter indicating link onlineness
+ *	@check_ready: optional callback to check link readiness
+ *
+ *	SATA phy-reset @link using DET bits of SControl register.
+ *	After hardreset, link readiness is waited upon using
+ *	ata_wait_ready() if @check_ready is specified.  LLDs are
+ *	allowed to not specify @check_ready and wait itself after this
+ *	function returns.  Device classification is LLD's
+ *	responsibility.
+ *
+ *	*@online is set to one iff reset succeeded and @link is online
+ *	after reset.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
+			unsigned long deadline,
+			bool *online, int (*check_ready)(struct ata_link *))
+{
+	u32 scontrol;
+	int rc;
+
+	if (online)
+		*online = false;
+
+	if (sata_set_spd_needed(link)) {
+		/* SATA spec says nothing about how to reconfigure
+		 * spd.  To be on the safe side, turn off phy during
+		 * reconfiguration.  This works for at least ICH7 AHCI
+		 * and Sil3124.
+		 */
+		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
+			goto out;
+
+		scontrol = (scontrol & 0x0f0) | 0x304;
+
+		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
+			goto out;
+
+		sata_set_spd(link);
+	}
+
+	/* issue phy wake/reset */
+	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
+		goto out;
+
+	scontrol = (scontrol & 0x0f0) | 0x301;
+
+	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
+		goto out;
+
+	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
+	 * 10.4.2 says at least 1 ms.
+	 */
+	ata_msleep(link->ap, 1);
+
+	/* bring link back */
+	rc = sata_link_resume(link, timing, deadline);
+	if (rc)
+		goto out;
+	/* if link is offline nothing more to do */
+	if (ata_phys_link_offline(link))
+		goto out;
+
+	/* Link is online.  From this point, -ENODEV too is an error. */
+	if (online)
+		*online = true;
+
+	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
+		/* If PMP is supported, we have to do follow-up SRST.
+		 * Some PMPs don't send D2H Reg FIS after hardreset if
+		 * the first port is empty.  Wait only for
+		 * ATA_TMOUT_PMP_SRST_WAIT.
+		 */
+		if (check_ready) {
+			unsigned long pmp_deadline;
+
+			pmp_deadline = ata_deadline(jiffies,
+						    ATA_TMOUT_PMP_SRST_WAIT);
+			if (time_after(pmp_deadline, deadline))
+				pmp_deadline = deadline;
+			ata_wait_ready(link, pmp_deadline, check_ready);
+		}
+		rc = -EAGAIN;
+		goto out;
+	}
+
+	rc = 0;
+	if (check_ready)
+		rc = ata_wait_ready(link, deadline, check_ready);
+ out:
+	if (rc && rc != -EAGAIN) {
+		/* online is set iff link is online && reset succeeded */
+		if (online)
+			*online = false;
+		ata_link_err(link, "COMRESET failed (errno=%d)\n", rc);
+	}
+	return rc;
+}
+EXPORT_SYMBOL_GPL(sata_link_hardreset);
+
 /**
  *	ata_slave_link_init - initialize slave link
  *	@ap: port to initialize slave link for
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 53b45ebe3d55..cd8090ad43e5 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -87,13 +87,6 @@ extern unsigned int ata_read_log_page(struct ata_device *dev, u8 log,
 
 #define to_ata_port(d) container_of(d, struct ata_port, tdev)
 
-/* libata-sata.c */
-#ifdef CONFIG_SATA_HOST
-int sata_set_spd_needed(struct ata_link *link);
-#else
-static inline int sata_set_spd_needed(struct ata_link *link) { return 1; }
-#endif
-
 /* libata-acpi.c */
 #ifdef CONFIG_ATA_ACPI
 extern unsigned int ata_acpi_gtf_filter;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index f67a7bbb3c35..ecee9544fb86 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1069,9 +1069,6 @@ static inline int ata_port_is_dummy(struct ata_port *ap)
 extern int ata_std_prereset(struct ata_link *link, unsigned long deadline);
 extern int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
 				int (*check_ready)(struct ata_link *link));
-extern int sata_link_hardreset(struct ata_link *link,
-			const unsigned long *timing, unsigned long deadline,
-			bool *online, int (*check_ready)(struct ata_link *));
 extern int sata_std_hardreset(struct ata_link *link, unsigned int *class,
 			      unsigned long deadline);
 extern void ata_std_postreset(struct ata_link *link, unsigned int *classes);
@@ -1192,6 +1189,9 @@ extern int sata_scr_read(struct ata_link *link, int reg, u32 *val);
 extern int sata_scr_write(struct ata_link *link, int reg, u32 val);
 extern int sata_scr_write_flush(struct ata_link *link, int reg, u32 val);
 extern int sata_set_spd(struct ata_link *link);
+extern int sata_link_hardreset(struct ata_link *link,
+			const unsigned long *timing, unsigned long deadline,
+			bool *online, int (*check_ready)(struct ata_link *));
 extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
 			    unsigned long deadline);
 #else
@@ -1209,6 +1209,16 @@ static inline int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
 	return -EOPNOTSUPP;
 }
 static inline int sata_set_spd(struct ata_link *link) { return -EOPNOTSUPP; }
+static inline int sata_link_hardreset(struct ata_link *link,
+				      const unsigned long *timing,
+				      unsigned long deadline,
+				      bool *online,
+				      int (*check_ready)(struct ata_link *))
+{
+	if (online)
+		*online = false;
+	return -EOPNOTSUPP;
+}
 static inline int sata_link_resume(struct ata_link *link,
 				   const unsigned long *params,
 				   unsigned long deadline)
-- 
2.24.1

[PATCH v4 21/27] ata: move ata_qc_complete_multiple() to libata-sata.c

[Bartlomiej Zolnierkiewicz]

* move ata_qc_complete_multiple() to libata-sata.c

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  32559     572      40   33171    8193 drivers/ata/libata-core.o
after:
  32162     572      40   32774    8006 drivers/ata/libata-core.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-core.c | 59 ---------------------------------------
 drivers/ata/libata-sata.c | 59 +++++++++++++++++++++++++++++++++++++++
 include/linux/libata.h    |  2 +-
 3 files changed, 60 insertions(+), 60 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 1879072419fe..d246bc1e08c9 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4757,65 +4757,6 @@ u64 ata_qc_get_active(struct ata_port *ap)
 }
 EXPORT_SYMBOL_GPL(ata_qc_get_active);
 
-/**
- *	ata_qc_complete_multiple - Complete multiple qcs successfully
- *	@ap: port in question
- *	@qc_active: new qc_active mask
- *
- *	Complete in-flight commands.  This functions is meant to be
- *	called from low-level driver's interrupt routine to complete
- *	requests normally.  ap->qc_active and @qc_active is compared
- *	and commands are completed accordingly.
- *
- *	Always use this function when completing multiple NCQ commands
- *	from IRQ handlers instead of calling ata_qc_complete()
- *	multiple times to keep IRQ expect status properly in sync.
- *
- *	LOCKING:
- *	spin_lock_irqsave(host lock)
- *
- *	RETURNS:
- *	Number of completed commands on success, -errno otherwise.
- */
-int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active)
-{
-	u64 done_mask, ap_qc_active = ap->qc_active;
-	int nr_done = 0;
-
-	/*
-	 * If the internal tag is set on ap->qc_active, then we care about
-	 * bit0 on the passed in qc_active mask. Move that bit up to match
-	 * the internal tag.
-	 */
-	if (ap_qc_active & (1ULL << ATA_TAG_INTERNAL)) {
-		qc_active |= (qc_active & 0x01) << ATA_TAG_INTERNAL;
-		qc_active ^= qc_active & 0x01;
-	}
-
-	done_mask = ap_qc_active ^ qc_active;
-
-	if (unlikely(done_mask & qc_active)) {
-		ata_port_err(ap, "illegal qc_active transition (%08llx->%08llx)\n",
-			     ap->qc_active, qc_active);
-		return -EINVAL;
-	}
-
-	while (done_mask) {
-		struct ata_queued_cmd *qc;
-		unsigned int tag = __ffs64(done_mask);
-
-		qc = ata_qc_from_tag(ap, tag);
-		if (qc) {
-			ata_qc_complete(qc);
-			nr_done++;
-		}
-		done_mask &= ~(1ULL << tag);
-	}
-
-	return nr_done;
-}
-EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
-
 /**
  *	ata_qc_issue - issue taskfile to device
  *	@qc: command to issue to device
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index ccd60f71ca31..57344f87b4e0 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -600,6 +600,65 @@ int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
 }
 EXPORT_SYMBOL_GPL(sata_link_hardreset);
 
+/**
+ *	ata_qc_complete_multiple - Complete multiple qcs successfully
+ *	@ap: port in question
+ *	@qc_active: new qc_active mask
+ *
+ *	Complete in-flight commands.  This functions is meant to be
+ *	called from low-level driver's interrupt routine to complete
+ *	requests normally.  ap->qc_active and @qc_active is compared
+ *	and commands are completed accordingly.
+ *
+ *	Always use this function when completing multiple NCQ commands
+ *	from IRQ handlers instead of calling ata_qc_complete()
+ *	multiple times to keep IRQ expect status properly in sync.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ *
+ *	RETURNS:
+ *	Number of completed commands on success, -errno otherwise.
+ */
+int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active)
+{
+	u64 done_mask, ap_qc_active = ap->qc_active;
+	int nr_done = 0;
+
+	/*
+	 * If the internal tag is set on ap->qc_active, then we care about
+	 * bit0 on the passed in qc_active mask. Move that bit up to match
+	 * the internal tag.
+	 */
+	if (ap_qc_active & (1ULL << ATA_TAG_INTERNAL)) {
+		qc_active |= (qc_active & 0x01) << ATA_TAG_INTERNAL;
+		qc_active ^= qc_active & 0x01;
+	}
+
+	done_mask = ap_qc_active ^ qc_active;
+
+	if (unlikely(done_mask & qc_active)) {
+		ata_port_err(ap, "illegal qc_active transition (%08llx->%08llx)\n",
+			     ap->qc_active, qc_active);
+		return -EINVAL;
+	}
+
+	while (done_mask) {
+		struct ata_queued_cmd *qc;
+		unsigned int tag = __ffs64(done_mask);
+
+		qc = ata_qc_from_tag(ap, tag);
+		if (qc) {
+			ata_qc_complete(qc);
+			nr_done++;
+		}
+		done_mask &= ~(1ULL << tag);
+	}
+
+	return nr_done;
+}
+EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
+
 /**
  *	ata_slave_link_init - initialize slave link
  *	@ap: port to initialize slave link for
diff --git a/include/linux/libata.h b/include/linux/libata.h
index ecee9544fb86..d9cb7768fb64 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1157,7 +1157,6 @@ extern void ata_id_c_string(const u16 *id, unsigned char *s,
 extern unsigned int ata_do_dev_read_id(struct ata_device *dev,
 					struct ata_taskfile *tf, u16 *id);
 extern void ata_qc_complete(struct ata_queued_cmd *qc);
-extern int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active);
 extern u64 ata_qc_get_active(struct ata_port *ap);
 extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd);
 extern int ata_std_bios_param(struct scsi_device *sdev,
@@ -1234,6 +1233,7 @@ extern int ata_slave_link_init(struct ata_port *ap);
 extern void ata_tf_to_fis(const struct ata_taskfile *tf,
                          u8 pmp, int is_cmd, u8 *fis);
 extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
+extern int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active);
 extern bool sata_lpm_ignore_phy_events(struct ata_link *link);
 
 extern int ata_cable_40wire(struct ata_port *ap);
-- 
2.24.1

[PATCH v4 22/27] ata: move sata_deb_timing_*() to libata-sata.c

[Bartlomiej Zolnierkiewicz]

* move sata_deb_timing_*() to libata-sata.c

* add static inline for sata_ehc_deb_timing() for
  CONFIG_SATA_HOST=n case

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  32158     572      40   32770    8002 drivers/ata/libata-core.o
after:
  32015     572      40   32627    7f73 drivers/ata/libata-core.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-core.c |  8 --------
 drivers/ata/libata-sata.c |  8 ++++++++
 include/linux/libata.h    | 31 ++++++++++++++++++-------------
 3 files changed, 26 insertions(+), 21 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index d246bc1e08c9..53d1d017c752 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -65,14 +65,6 @@
 #include "libata.h"
 #include "libata-transport.h"
 
-/* debounce timing parameters in msecs { interval, duration, timeout } */
-const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
-EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
-const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
-EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
-const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
-EXPORT_SYMBOL_GPL(sata_deb_timing_long);
-
 const struct ata_port_operations ata_base_port_ops = {
 	.prereset		= ata_std_prereset,
 	.postreset		= ata_std_postreset,
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index 57344f87b4e0..0cf30782452a 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -12,6 +12,14 @@
 
 #include "libata.h"
 
+/* debounce timing parameters in msecs { interval, duration, timeout } */
+const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
+EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
+const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
+EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
+const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
+EXPORT_SYMBOL_GPL(sata_deb_timing_long);
+
 /**
  *	sata_scr_valid - test whether SCRs are accessible
  *	@link: ATA link to test SCR accessibility for
diff --git a/include/linux/libata.h b/include/linux/libata.h
index d9cb7768fb64..0fa34370eefa 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1011,10 +1011,6 @@ struct ata_timing {
 /*
  * Core layer - drivers/ata/libata-core.c
  */
-extern const unsigned long sata_deb_timing_normal[];
-extern const unsigned long sata_deb_timing_hotplug[];
-extern const unsigned long sata_deb_timing_long[];
-
 extern struct ata_port_operations ata_dummy_port_ops;
 extern const struct ata_port_info ata_dummy_port_info;
 
@@ -1052,15 +1048,6 @@ static inline int is_multi_taskfile(struct ata_taskfile *tf)
 	       (tf->command == ATA_CMD_WRITE_MULTI_FUA_EXT);
 }
 
-static inline const unsigned long *
-sata_ehc_deb_timing(struct ata_eh_context *ehc)
-{
-	if (ehc->i.flags & ATA_EHI_HOTPLUGGED)
-		return sata_deb_timing_hotplug;
-	else
-		return sata_deb_timing_normal;
-}
-
 static inline int ata_port_is_dummy(struct ata_port *ap)
 {
 	return ap->ops == &ata_dummy_port_ops;
@@ -1183,6 +1170,19 @@ extern void ata_scsi_cmd_error_handler(struct Scsi_Host *host,
  * SATA specific code - drivers/ata/libata-sata.c
  */
 #ifdef CONFIG_SATA_HOST
+extern const unsigned long sata_deb_timing_normal[];
+extern const unsigned long sata_deb_timing_hotplug[];
+extern const unsigned long sata_deb_timing_long[];
+
+static inline const unsigned long *
+sata_ehc_deb_timing(struct ata_eh_context *ehc)
+{
+	if (ehc->i.flags & ATA_EHI_HOTPLUGGED)
+		return sata_deb_timing_hotplug;
+	else
+		return sata_deb_timing_normal;
+}
+
 extern int sata_scr_valid(struct ata_link *link);
 extern int sata_scr_read(struct ata_link *link, int reg, u32 *val);
 extern int sata_scr_write(struct ata_link *link, int reg, u32 val);
@@ -1194,6 +1194,11 @@ extern int sata_link_hardreset(struct ata_link *link,
 extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
 			    unsigned long deadline);
 #else
+static inline const unsigned long *
+sata_ehc_deb_timing(struct ata_eh_context *ehc)
+{
+	return NULL;
+}
 static inline int sata_scr_valid(struct ata_link *link) { return 0; }
 static inline int sata_scr_read(struct ata_link *link, int reg, u32 *val)
 {
-- 
2.24.1

[PATCH v4 23/27] ata: start separating SATA specific code from libata-scsi.c

[Bartlomiej Zolnierkiewicz]

Start separating SATA specific code from libata-scsi.c:

* un-static ata_scsi_find_dev()

* move following code to libata-sata.c:
  - SATA only sysfs device attributes handling
  - __ata_change_queue_depth()
  - ata_scsi_change_queue_depth()

* cover with CONFIG_SATA_HOST ifdef SATA only sysfs device
  attributes handling code and ATA_SHT_NCQ() macro in
  <linux/libata.h>

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  20702     105     576   21383    5387 drivers/ata/libata-scsi.o
after:
  19137      23     576   19736    4d18 drivers/ata/libata-scsi.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-sata.c | 298 +++++++++++++++++++++++++++++++++++++
 drivers/ata/libata-scsi.c | 301 +-------------------------------------
 drivers/ata/libata.h      |   2 +
 include/linux/libata.h    |   9 +-
 4 files changed, 308 insertions(+), 302 deletions(-)

diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index 0cf30782452a..c9760b52fb57 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -8,6 +8,7 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <scsi/scsi_device.h>
 #include <linux/libata.h>
 
 #include "libata.h"
@@ -761,3 +762,300 @@ bool sata_lpm_ignore_phy_events(struct ata_link *link)
 	return false;
 }
 EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events);
+
+static const char *ata_lpm_policy_names[] = {
+	[ATA_LPM_UNKNOWN]		= "max_performance",
+	[ATA_LPM_MAX_POWER]		= "max_performance",
+	[ATA_LPM_MED_POWER]		= "medium_power",
+	[ATA_LPM_MED_POWER_WITH_DIPM]	= "med_power_with_dipm",
+	[ATA_LPM_MIN_POWER_WITH_PARTIAL] = "min_power_with_partial",
+	[ATA_LPM_MIN_POWER]		= "min_power",
+};
+
+static ssize_t ata_scsi_lpm_store(struct device *device,
+				  struct device_attribute *attr,
+				  const char *buf, size_t count)
+{
+	struct Scsi_Host *shost = class_to_shost(device);
+	struct ata_port *ap = ata_shost_to_port(shost);
+	struct ata_link *link;
+	struct ata_device *dev;
+	enum ata_lpm_policy policy;
+	unsigned long flags;
+
+	/* UNKNOWN is internal state, iterate from MAX_POWER */
+	for (policy = ATA_LPM_MAX_POWER;
+	     policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
+		const char *name = ata_lpm_policy_names[policy];
+
+		if (strncmp(name, buf, strlen(name)) == 0)
+			break;
+	}
+	if (policy == ARRAY_SIZE(ata_lpm_policy_names))
+		return -EINVAL;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	ata_for_each_link(link, ap, EDGE) {
+		ata_for_each_dev(dev, &ap->link, ENABLED) {
+			if (dev->horkage & ATA_HORKAGE_NOLPM) {
+				count = -EOPNOTSUPP;
+				goto out_unlock;
+			}
+		}
+	}
+
+	ap->target_lpm_policy = policy;
+	ata_port_schedule_eh(ap);
+out_unlock:
+	spin_unlock_irqrestore(ap->lock, flags);
+	return count;
+}
+
+static ssize_t ata_scsi_lpm_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ata_port *ap = ata_shost_to_port(shost);
+
+	if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
+		return -EINVAL;
+
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			ata_lpm_policy_names[ap->target_lpm_policy]);
+}
+DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
+	    ata_scsi_lpm_show, ata_scsi_lpm_store);
+EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
+
+static ssize_t ata_ncq_prio_enable_show(struct device *device,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct scsi_device *sdev = to_scsi_device(device);
+	struct ata_port *ap;
+	struct ata_device *dev;
+	bool ncq_prio_enable;
+	int rc = 0;
+
+	ap = ata_shost_to_port(sdev->host);
+
+	spin_lock_irq(ap->lock);
+	dev = ata_scsi_find_dev(ap, sdev);
+	if (!dev) {
+		rc = -ENODEV;
+		goto unlock;
+	}
+
+	ncq_prio_enable = dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE;
+
+unlock:
+	spin_unlock_irq(ap->lock);
+
+	return rc ? rc : snprintf(buf, 20, "%u\n", ncq_prio_enable);
+}
+
+static ssize_t ata_ncq_prio_enable_store(struct device *device,
+					 struct device_attribute *attr,
+					 const char *buf, size_t len)
+{
+	struct scsi_device *sdev = to_scsi_device(device);
+	struct ata_port *ap;
+	struct ata_device *dev;
+	long int input;
+	int rc;
+
+	rc = kstrtol(buf, 10, &input);
+	if (rc)
+		return rc;
+	if ((input < 0) || (input > 1))
+		return -EINVAL;
+
+	ap = ata_shost_to_port(sdev->host);
+	dev = ata_scsi_find_dev(ap, sdev);
+	if (unlikely(!dev))
+		return  -ENODEV;
+
+	spin_lock_irq(ap->lock);
+	if (input)
+		dev->flags |= ATA_DFLAG_NCQ_PRIO_ENABLE;
+	else
+		dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
+
+	dev->link->eh_info.action |= ATA_EH_REVALIDATE;
+	dev->link->eh_info.flags |= ATA_EHI_QUIET;
+	ata_port_schedule_eh(ap);
+	spin_unlock_irq(ap->lock);
+
+	ata_port_wait_eh(ap);
+
+	if (input) {
+		spin_lock_irq(ap->lock);
+		if (!(dev->flags & ATA_DFLAG_NCQ_PRIO)) {
+			dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
+			rc = -EIO;
+		}
+		spin_unlock_irq(ap->lock);
+	}
+
+	return rc ? rc : len;
+}
+
+DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
+	    ata_ncq_prio_enable_show, ata_ncq_prio_enable_store);
+EXPORT_SYMBOL_GPL(dev_attr_ncq_prio_enable);
+
+struct device_attribute *ata_ncq_sdev_attrs[] = {
+	&dev_attr_unload_heads,
+	&dev_attr_ncq_prio_enable,
+	NULL
+};
+EXPORT_SYMBOL_GPL(ata_ncq_sdev_attrs);
+
+static ssize_t
+ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ata_port *ap = ata_shost_to_port(shost);
+	if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
+		return ap->ops->em_store(ap, buf, count);
+	return -EINVAL;
+}
+
+static ssize_t
+ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ata_port *ap = ata_shost_to_port(shost);
+
+	if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
+		return ap->ops->em_show(ap, buf);
+	return -EINVAL;
+}
+DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
+		ata_scsi_em_message_show, ata_scsi_em_message_store);
+EXPORT_SYMBOL_GPL(dev_attr_em_message);
+
+static ssize_t
+ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ata_port *ap = ata_shost_to_port(shost);
+
+	return snprintf(buf, 23, "%d\n", ap->em_message_type);
+}
+DEVICE_ATTR(em_message_type, S_IRUGO,
+		  ata_scsi_em_message_type_show, NULL);
+EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
+
+static ssize_t
+ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
+
+	if (atadev && ap->ops->sw_activity_show &&
+	    (ap->flags & ATA_FLAG_SW_ACTIVITY))
+		return ap->ops->sw_activity_show(atadev, buf);
+	return -EINVAL;
+}
+
+static ssize_t
+ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
+	const char *buf, size_t count)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
+	enum sw_activity val;
+	int rc;
+
+	if (atadev && ap->ops->sw_activity_store &&
+	    (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
+		val = simple_strtoul(buf, NULL, 0);
+		switch (val) {
+		case OFF: case BLINK_ON: case BLINK_OFF:
+			rc = ap->ops->sw_activity_store(atadev, val);
+			if (!rc)
+				return count;
+			else
+				return rc;
+		}
+	}
+	return -EINVAL;
+}
+DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
+			ata_scsi_activity_store);
+EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
+
+/**
+ *	__ata_change_queue_depth - helper for ata_scsi_change_queue_depth
+ *	@ap: ATA port to which the device change the queue depth
+ *	@sdev: SCSI device to configure queue depth for
+ *	@queue_depth: new queue depth
+ *
+ *	libsas and libata have different approaches for associating a sdev to
+ *	its ata_port.
+ *
+ */
+int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
+			     int queue_depth)
+{
+	struct ata_device *dev;
+	unsigned long flags;
+
+	if (queue_depth < 1 || queue_depth == sdev->queue_depth)
+		return sdev->queue_depth;
+
+	dev = ata_scsi_find_dev(ap, sdev);
+	if (!dev || !ata_dev_enabled(dev))
+		return sdev->queue_depth;
+
+	/* NCQ enabled? */
+	spin_lock_irqsave(ap->lock, flags);
+	dev->flags &= ~ATA_DFLAG_NCQ_OFF;
+	if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
+		dev->flags |= ATA_DFLAG_NCQ_OFF;
+		queue_depth = 1;
+	}
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	/* limit and apply queue depth */
+	queue_depth = min(queue_depth, sdev->host->can_queue);
+	queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
+	queue_depth = min(queue_depth, ATA_MAX_QUEUE);
+
+	if (sdev->queue_depth == queue_depth)
+		return -EINVAL;
+
+	return scsi_change_queue_depth(sdev, queue_depth);
+}
+EXPORT_SYMBOL_GPL(__ata_change_queue_depth);
+
+/**
+ *	ata_scsi_change_queue_depth - SCSI callback for queue depth config
+ *	@sdev: SCSI device to configure queue depth for
+ *	@queue_depth: new queue depth
+ *
+ *	This is libata standard hostt->change_queue_depth callback.
+ *	SCSI will call into this callback when user tries to set queue
+ *	depth via sysfs.
+ *
+ *	LOCKING:
+ *	SCSI layer (we don't care)
+ *
+ *	RETURNS:
+ *	Newly configured queue depth.
+ */
+int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
+{
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+
+	return __ata_change_queue_depth(ap, sdev, queue_depth);
+}
+EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 2bf1376bc027..1000f7b0098b 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -46,8 +46,6 @@ typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
 
 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
 					const struct scsi_device *scsidev);
-static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
-					    const struct scsi_device *scsidev);
 
 #define RW_RECOVERY_MPAGE 0x1
 #define RW_RECOVERY_MPAGE_LEN 12
@@ -87,71 +85,6 @@ static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
 	0, 30	/* extended self test time, see 05-359r1 */
 };
 
-static const char *ata_lpm_policy_names[] = {
-	[ATA_LPM_UNKNOWN]		= "max_performance",
-	[ATA_LPM_MAX_POWER]		= "max_performance",
-	[ATA_LPM_MED_POWER]		= "medium_power",
-	[ATA_LPM_MED_POWER_WITH_DIPM]	= "med_power_with_dipm",
-	[ATA_LPM_MIN_POWER_WITH_PARTIAL] = "min_power_with_partial",
-	[ATA_LPM_MIN_POWER]		= "min_power",
-};
-
-static ssize_t ata_scsi_lpm_store(struct device *device,
-				  struct device_attribute *attr,
-				  const char *buf, size_t count)
-{
-	struct Scsi_Host *shost = class_to_shost(device);
-	struct ata_port *ap = ata_shost_to_port(shost);
-	struct ata_link *link;
-	struct ata_device *dev;
-	enum ata_lpm_policy policy;
-	unsigned long flags;
-
-	/* UNKNOWN is internal state, iterate from MAX_POWER */
-	for (policy = ATA_LPM_MAX_POWER;
-	     policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
-		const char *name = ata_lpm_policy_names[policy];
-
-		if (strncmp(name, buf, strlen(name)) == 0)
-			break;
-	}
-	if (policy == ARRAY_SIZE(ata_lpm_policy_names))
-		return -EINVAL;
-
-	spin_lock_irqsave(ap->lock, flags);
-
-	ata_for_each_link(link, ap, EDGE) {
-		ata_for_each_dev(dev, &ap->link, ENABLED) {
-			if (dev->horkage & ATA_HORKAGE_NOLPM) {
-				count = -EOPNOTSUPP;
-				goto out_unlock;
-			}
-		}
-	}
-
-	ap->target_lpm_policy = policy;
-	ata_port_schedule_eh(ap);
-out_unlock:
-	spin_unlock_irqrestore(ap->lock, flags);
-	return count;
-}
-
-static ssize_t ata_scsi_lpm_show(struct device *dev,
-				 struct device_attribute *attr, char *buf)
-{
-	struct Scsi_Host *shost = class_to_shost(dev);
-	struct ata_port *ap = ata_shost_to_port(shost);
-
-	if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
-		return -EINVAL;
-
-	return snprintf(buf, PAGE_SIZE, "%s\n",
-			ata_lpm_policy_names[ap->target_lpm_policy]);
-}
-DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
-	    ata_scsi_lpm_show, ata_scsi_lpm_store);
-EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
-
 static ssize_t ata_scsi_park_show(struct device *device,
 				  struct device_attribute *attr, char *buf)
 {
@@ -255,83 +188,6 @@ DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
 	    ata_scsi_park_show, ata_scsi_park_store);
 EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
 
-static ssize_t ata_ncq_prio_enable_show(struct device *device,
-					struct device_attribute *attr,
-					char *buf)
-{
-	struct scsi_device *sdev = to_scsi_device(device);
-	struct ata_port *ap;
-	struct ata_device *dev;
-	bool ncq_prio_enable;
-	int rc = 0;
-
-	ap = ata_shost_to_port(sdev->host);
-
-	spin_lock_irq(ap->lock);
-	dev = ata_scsi_find_dev(ap, sdev);
-	if (!dev) {
-		rc = -ENODEV;
-		goto unlock;
-	}
-
-	ncq_prio_enable = dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE;
-
-unlock:
-	spin_unlock_irq(ap->lock);
-
-	return rc ? rc : snprintf(buf, 20, "%u\n", ncq_prio_enable);
-}
-
-static ssize_t ata_ncq_prio_enable_store(struct device *device,
-					 struct device_attribute *attr,
-					 const char *buf, size_t len)
-{
-	struct scsi_device *sdev = to_scsi_device(device);
-	struct ata_port *ap;
-	struct ata_device *dev;
-	long int input;
-	int rc;
-
-	rc = kstrtol(buf, 10, &input);
-	if (rc)
-		return rc;
-	if ((input < 0) || (input > 1))
-		return -EINVAL;
-
-	ap = ata_shost_to_port(sdev->host);
-	dev = ata_scsi_find_dev(ap, sdev);
-	if (unlikely(!dev))
-		return  -ENODEV;
-
-	spin_lock_irq(ap->lock);
-	if (input)
-		dev->flags |= ATA_DFLAG_NCQ_PRIO_ENABLE;
-	else
-		dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
-
-	dev->link->eh_info.action |= ATA_EH_REVALIDATE;
-	dev->link->eh_info.flags |= ATA_EHI_QUIET;
-	ata_port_schedule_eh(ap);
-	spin_unlock_irq(ap->lock);
-
-	ata_port_wait_eh(ap);
-
-	if (input) {
-		spin_lock_irq(ap->lock);
-		if (!(dev->flags & ATA_DFLAG_NCQ_PRIO)) {
-			dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
-			rc = -EIO;
-		}
-		spin_unlock_irq(ap->lock);
-	}
-
-	return rc ? rc : len;
-}
-
-DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
-	    ata_ncq_prio_enable_show, ata_ncq_prio_enable_store);
-EXPORT_SYMBOL_GPL(dev_attr_ncq_prio_enable);
-
 void ata_scsi_set_sense(struct ata_device *dev, struct scsi_cmnd *cmd,
 			u8 sk, u8 asc, u8 ascq)
 {
@@ -380,100 +236,12 @@ static void ata_scsi_set_invalid_parameter(struct ata_device *dev,
 				     field, 0xff, 0);
 }
 
-static ssize_t
-ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
-			  const char *buf, size_t count)
-{
-	struct Scsi_Host *shost = class_to_shost(dev);
-	struct ata_port *ap = ata_shost_to_port(shost);
-	if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
-		return ap->ops->em_store(ap, buf, count);
-	return -EINVAL;
-}
-
-static ssize_t
-ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
-			 char *buf)
-{
-	struct Scsi_Host *shost = class_to_shost(dev);
-	struct ata_port *ap = ata_shost_to_port(shost);
-
-	if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
-		return ap->ops->em_show(ap, buf);
-	return -EINVAL;
-}
-DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
-		ata_scsi_em_message_show, ata_scsi_em_message_store);
-EXPORT_SYMBOL_GPL(dev_attr_em_message);
-
-static ssize_t
-ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
-			      char *buf)
-{
-	struct Scsi_Host *shost = class_to_shost(dev);
-	struct ata_port *ap = ata_shost_to_port(shost);
-
-	return snprintf(buf, 23, "%d\n", ap->em_message_type);
-}
-DEVICE_ATTR(em_message_type, S_IRUGO,
-		  ata_scsi_em_message_type_show, NULL);
-EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
-
-static ssize_t
-ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
-		char *buf)
-{
-	struct scsi_device *sdev = to_scsi_device(dev);
-	struct ata_port *ap = ata_shost_to_port(sdev->host);
-	struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
-
-	if (atadev && ap->ops->sw_activity_show &&
-	    (ap->flags & ATA_FLAG_SW_ACTIVITY))
-		return ap->ops->sw_activity_show(atadev, buf);
-	return -EINVAL;
-}
-
-static ssize_t
-ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
-	const char *buf, size_t count)
-{
-	struct scsi_device *sdev = to_scsi_device(dev);
-	struct ata_port *ap = ata_shost_to_port(sdev->host);
-	struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
-	enum sw_activity val;
-	int rc;
-
-	if (atadev && ap->ops->sw_activity_store &&
-	    (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
-		val = simple_strtoul(buf, NULL, 0);
-		switch (val) {
-		case OFF: case BLINK_ON: case BLINK_OFF:
-			rc = ap->ops->sw_activity_store(atadev, val);
-			if (!rc)
-				return count;
-			else
-				return rc;
-		}
-	}
-	return -EINVAL;
-}
-DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
-			ata_scsi_activity_store);
-EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
-
 struct device_attribute *ata_common_sdev_attrs[] = {
 	&dev_attr_unload_heads,
 	NULL
 };
 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
 
-struct device_attribute *ata_ncq_sdev_attrs[] = {
-	&dev_attr_unload_heads,
-	&dev_attr_ncq_prio_enable,
-	NULL
-};
-EXPORT_SYMBOL_GPL(ata_ncq_sdev_attrs);
-
 /**
  *	ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
  *	@sdev: SCSI device for which BIOS geometry is to be determined
@@ -1391,73 +1159,6 @@ void ata_scsi_slave_destroy(struct scsi_device *sdev)
 }
 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
 
-/**
- *	__ata_change_queue_depth - helper for ata_scsi_change_queue_depth
- *	@ap: ATA port to which the device change the queue depth
- *	@sdev: SCSI device to configure queue depth for
- *	@queue_depth: new queue depth
- *
- *	libsas and libata have different approaches for associating a sdev to
- *	its ata_port.
- *
- */
-int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
-			     int queue_depth)
-{
-	struct ata_device *dev;
-	unsigned long flags;
-
-	if (queue_depth < 1 || queue_depth == sdev->queue_depth)
-		return sdev->queue_depth;
-
-	dev = ata_scsi_find_dev(ap, sdev);
-	if (!dev || !ata_dev_enabled(dev))
-		return sdev->queue_depth;
-
-	/* NCQ enabled? */
-	spin_lock_irqsave(ap->lock, flags);
-	dev->flags &= ~ATA_DFLAG_NCQ_OFF;
-	if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
-		dev->flags |= ATA_DFLAG_NCQ_OFF;
-		queue_depth = 1;
-	}
-	spin_unlock_irqrestore(ap->lock, flags);
-
-	/* limit and apply queue depth */
-	queue_depth = min(queue_depth, sdev->host->can_queue);
-	queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
-	queue_depth = min(queue_depth, ATA_MAX_QUEUE);
-
-	if (sdev->queue_depth == queue_depth)
-		return -EINVAL;
-
-	return scsi_change_queue_depth(sdev, queue_depth);
-}
-EXPORT_SYMBOL_GPL(__ata_change_queue_depth);
-
-/**
- *	ata_scsi_change_queue_depth - SCSI callback for queue depth config
- *	@sdev: SCSI device to configure queue depth for
- *	@queue_depth: new queue depth
- *
- *	This is libata standard hostt->change_queue_depth callback.
- *	SCSI will call into this callback when user tries to set queue
- *	depth via sysfs.
- *
- *	LOCKING:
- *	SCSI layer (we don't care)
- *
- *	RETURNS:
- *	Newly configured queue depth.
- */
-int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
-{
-	struct ata_port *ap = ata_shost_to_port(sdev->host);
-
-	return __ata_change_queue_depth(ap, sdev, queue_depth);
-}
-EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
-
 /**
  *	ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
  *	@qc: Storage for translated ATA taskfile
@@ -3082,7 +2783,7 @@ static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
  *	RETURNS:
  *	Associated ATA device, or %NULL if not found.
  */
-static struct ata_device *
+struct ata_device *
 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
 {
 	struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index cd8090ad43e5..ce3f3c039572 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -112,6 +112,8 @@ static inline void ata_acpi_bind_dev(struct ata_device *dev) {}
 #endif
 
 /* libata-scsi.c */
+extern struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
+					    const struct scsi_device *scsidev);
 extern int ata_scsi_add_hosts(struct ata_host *host,
 			      struct scsi_host_template *sht);
 extern void ata_scsi_scan_host(struct ata_port *ap, int sync);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 0fa34370eefa..cc14030c139e 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -519,12 +519,14 @@ typedef int (*ata_reset_fn_t)(struct ata_link *link, unsigned int *classes,
 			      unsigned long deadline);
 typedef void (*ata_postreset_fn_t)(struct ata_link *link, unsigned int *classes);
 
-extern struct device_attribute dev_attr_link_power_management_policy;
 extern struct device_attribute dev_attr_unload_heads;
+#ifdef CONFIG_SATA_HOST
+extern struct device_attribute dev_attr_link_power_management_policy;
 extern struct device_attribute dev_attr_ncq_prio_enable;
 extern struct device_attribute dev_attr_em_message_type;
 extern struct device_attribute dev_attr_em_message;
 extern struct device_attribute dev_attr_sw_activity;
+#endif
 
 enum sw_activity {
 	OFF,
@@ -1374,7 +1376,6 @@ extern int ata_link_nr_enabled(struct ata_link *link);
 extern const struct ata_port_operations ata_base_port_ops;
 extern const struct ata_port_operations sata_port_ops;
 extern struct device_attribute *ata_common_sdev_attrs[];
-extern struct device_attribute *ata_ncq_sdev_attrs[];
 
 /*
  * All sht initializers (BASE, PIO, BMDMA, NCQ) must be instantiated
@@ -1402,10 +1403,14 @@ extern struct device_attribute *ata_ncq_sdev_attrs[];
 	__ATA_BASE_SHT(drv_name),				\
 	.sdev_attrs		= ata_common_sdev_attrs
 
+#ifdef CONFIG_SATA_HOST
+extern struct device_attribute *ata_ncq_sdev_attrs[];
+
 #define ATA_NCQ_SHT(drv_name)					\
 	__ATA_BASE_SHT(drv_name),				\
 	.sdev_attrs		= ata_ncq_sdev_attrs,		\
 	.change_queue_depth	= ata_scsi_change_queue_depth
+#endif
 
 /*
  * PMP helpers
-- 
2.24.1

[PATCH v4 24/27] ata: move ata_sas_*() to libata-sata.c

[Bartlomiej Zolnierkiewicz]

* un-inline:
  - ata_scsi_dump_cdb()
  - __ata_scsi_queuecmd()

* un-static:
  - ata_scsi_sdev_config()
  - ata_scsi_dev_config()
  - ata_scsi_dump_cdb()
  - __ata_scsi_queuecmd()

* move ata_sas_*() to libata-sata.c:

* add static inlines for CONFIG_SATA_HOST=n case for
  ata_sas_{allocate,free}_tag()

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  19137      23     576   19736    4d18 drivers/ata/libata-scsi.o
after:
  18330      23     576   18929    49f1 drivers/ata/libata-scsi.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-sata.c | 213 ++++++++++++++++++++++++++++++++++++
 drivers/ata/libata-scsi.c | 222 +-------------------------------------
 drivers/ata/libata.h      |  19 +++-
 include/linux/libata.h    |  26 ++---
 4 files changed, 246 insertions(+), 234 deletions(-)

diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index c9760b52fb57..ad11a77a307c 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -8,10 +8,12 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_device.h>
 #include <linux/libata.h>
 
 #include "libata.h"
+#include "libata-transport.h"
 
 /* debounce timing parameters in msecs { interval, duration, timeout } */
 const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
@@ -1059,3 +1061,214 @@ int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
 	return __ata_change_queue_depth(ap, sdev, queue_depth);
 }
 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
+
+/**
+ *	port_alloc - Allocate port for a SAS attached SATA device
+ *	@host: ATA host container for all SAS ports
+ *	@port_info: Information from low-level host driver
+ *	@shost: SCSI host that the scsi device is attached to
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	ata_port pointer on success / NULL on failure.
+ */
+
+struct ata_port *ata_sas_port_alloc(struct ata_host *host,
+				    struct ata_port_info *port_info,
+				    struct Scsi_Host *shost)
+{
+	struct ata_port *ap;
+
+	ap = ata_port_alloc(host);
+	if (!ap)
+		return NULL;
+
+	ap->port_no = 0;
+	ap->lock = &host->lock;
+	ap->pio_mask = port_info->pio_mask;
+	ap->mwdma_mask = port_info->mwdma_mask;
+	ap->udma_mask = port_info->udma_mask;
+	ap->flags |= port_info->flags;
+	ap->ops = port_info->port_ops;
+	ap->cbl = ATA_CBL_SATA;
+
+	return ap;
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
+
+/**
+ *	ata_sas_port_start - Set port up for dma.
+ *	@ap: Port to initialize
+ *
+ *	Called just after data structures for each port are
+ *	initialized.
+ *
+ *	May be used as the port_start() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+int ata_sas_port_start(struct ata_port *ap)
+{
+	/*
+	 * the port is marked as frozen at allocation time, but if we don't
+	 * have new eh, we won't thaw it
+	 */
+	if (!ap->ops->error_handler)
+		ap->pflags &= ~ATA_PFLAG_FROZEN;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_start);
+
+/**
+ *	ata_port_stop - Undo ata_sas_port_start()
+ *	@ap: Port to shut down
+ *
+ *	May be used as the port_stop() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+void ata_sas_port_stop(struct ata_port *ap)
+{
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_stop);
+
+/**
+ * ata_sas_async_probe - simply schedule probing and return
+ * @ap: Port to probe
+ *
+ * For batch scheduling of probe for sas attached ata devices, assumes
+ * the port has already been through ata_sas_port_init()
+ */
+void ata_sas_async_probe(struct ata_port *ap)
+{
+	__ata_port_probe(ap);
+}
+EXPORT_SYMBOL_GPL(ata_sas_async_probe);
+
+int ata_sas_sync_probe(struct ata_port *ap)
+{
+	return ata_port_probe(ap);
+}
+EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
+
+
+/**
+ *	ata_sas_port_init - Initialize a SATA device
+ *	@ap: SATA port to initialize
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on error.
+ */
+
+int ata_sas_port_init(struct ata_port *ap)
+{
+	int rc = ap->ops->port_start(ap);
+
+	if (rc)
+		return rc;
+	ap->print_id = atomic_inc_return(&ata_print_id);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_init);
+
+int ata_sas_tport_add(struct device *parent, struct ata_port *ap)
+{
+	return ata_tport_add(parent, ap);
+}
+EXPORT_SYMBOL_GPL(ata_sas_tport_add);
+
+void ata_sas_tport_delete(struct ata_port *ap)
+{
+	ata_tport_delete(ap);
+}
+EXPORT_SYMBOL_GPL(ata_sas_tport_delete);
+
+/**
+ *	ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
+ *	@ap: SATA port to destroy
+ *
+ */
+
+void ata_sas_port_destroy(struct ata_port *ap)
+{
+	if (ap->ops->port_stop)
+		ap->ops->port_stop(ap);
+	kfree(ap);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
+
+/**
+ *	ata_sas_slave_configure - Default slave_config routine for libata devices
+ *	@sdev: SCSI device to configure
+ *	@ap: ATA port to which SCSI device is attached
+ *
+ *	RETURNS:
+ *	Zero.
+ */
+
+int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
+{
+	ata_scsi_sdev_config(sdev);
+	ata_scsi_dev_config(sdev, ap->link.device);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
+
+/**
+ *	ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
+ *	@cmd: SCSI command to be sent
+ *	@ap:	ATA port to which the command is being sent
+ *
+ *	RETURNS:
+ *	Return value from __ata_scsi_queuecmd() if @cmd can be queued,
+ *	0 otherwise.
+ */
+
+int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
+{
+	int rc = 0;
+
+	ata_scsi_dump_cdb(ap, cmd);
+
+	if (likely(ata_dev_enabled(ap->link.device)))
+		rc = __ata_scsi_queuecmd(cmd, ap->link.device);
+	else {
+		cmd->result = (DID_BAD_TARGET << 16);
+		cmd->scsi_done(cmd);
+	}
+	return rc;
+}
+EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
+
+int ata_sas_allocate_tag(struct ata_port *ap)
+{
+	unsigned int max_queue = ap->host->n_tags;
+	unsigned int i, tag;
+
+	for (i = 0, tag = ap->sas_last_tag + 1; i < max_queue; i++, tag++) {
+		tag = tag < max_queue ? tag : 0;
+
+		/* the last tag is reserved for internal command. */
+		if (ata_tag_internal(tag))
+			continue;
+
+		if (!test_and_set_bit(tag, &ap->sas_tag_allocated)) {
+			ap->sas_last_tag = tag;
+			return tag;
+		}
+	}
+	return -1;
+}
+
+void ata_sas_free_tag(unsigned int tag, struct ata_port *ap)
+{
+	clear_bit(tag, &ap->sas_tag_allocated);
+}
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 1000f7b0098b..5215761306e0 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -988,7 +988,7 @@ static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
 	scsi_set_sense_information(sb, SCSI_SENSE_BUFFERSIZE, block);
 }
 
-static void ata_scsi_sdev_config(struct scsi_device *sdev)
+void ata_scsi_sdev_config(struct scsi_device *sdev)
 {
 	sdev->use_10_for_rw = 1;
 	sdev->use_10_for_ms = 1;
@@ -1028,8 +1028,7 @@ static int atapi_drain_needed(struct request *rq)
 	return atapi_cmd_type(scsi_req(rq)->cmd[0]) == ATAPI_MISC;
 }
 
-static int ata_scsi_dev_config(struct scsi_device *sdev,
-			       struct ata_device *dev)
+int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
 {
 	struct request_queue *q = sdev->request_queue;
 
@@ -3993,8 +3992,7 @@ static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
  *	Prints the contents of a SCSI command via printk().
  */
 
-static inline void ata_scsi_dump_cdb(struct ata_port *ap,
-				     struct scsi_cmnd *cmd)
+void ata_scsi_dump_cdb(struct ata_port *ap, struct scsi_cmnd *cmd)
 {
 #ifdef ATA_VERBOSE_DEBUG
 	struct scsi_device *scsidev = cmd->device;
@@ -4006,8 +4004,7 @@ static inline void ata_scsi_dump_cdb(struct ata_port *ap,
 #endif
 }
 
-static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
-				      struct ata_device *dev)
+int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev)
 {
 	u8 scsi_op = scmd->cmnd[0];
 	ata_xlat_func_t xlat_func;
@@ -4648,214 +4645,3 @@ void ata_scsi_dev_rescan(struct work_struct *work)
 	spin_unlock_irqrestore(ap->lock, flags);
 	mutex_unlock(&ap->scsi_scan_mutex);
 }
-
-/**
- *	ata_sas_port_alloc - Allocate port for a SAS attached SATA device
- *	@host: ATA host container for all SAS ports
- *	@port_info: Information from low-level host driver
- *	@shost: SCSI host that the scsi device is attached to
- *
- *	LOCKING:
- *	PCI/etc. bus probe sem.
- *
- *	RETURNS:
- *	ata_port pointer on success / NULL on failure.
- */
-
-struct ata_port *ata_sas_port_alloc(struct ata_host *host,
-				    struct ata_port_info *port_info,
-				    struct Scsi_Host *shost)
-{
-	struct ata_port *ap;
-
-	ap = ata_port_alloc(host);
-	if (!ap)
-		return NULL;
-
-	ap->port_no = 0;
-	ap->lock = &host->lock;
-	ap->pio_mask = port_info->pio_mask;
-	ap->mwdma_mask = port_info->mwdma_mask;
-	ap->udma_mask = port_info->udma_mask;
-	ap->flags |= port_info->flags;
-	ap->ops = port_info->port_ops;
-	ap->cbl = ATA_CBL_SATA;
-
-	return ap;
-}
-EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
-
-/**
- *	ata_sas_port_start - Set port up for dma.
- *	@ap: Port to initialize
- *
- *	Called just after data structures for each port are
- *	initialized.
- *
- *	May be used as the port_start() entry in ata_port_operations.
- *
- *	LOCKING:
- *	Inherited from caller.
- */
-int ata_sas_port_start(struct ata_port *ap)
-{
-	/*
-	 * the port is marked as frozen at allocation time, but if we don't
-	 * have new eh, we won't thaw it
-	 */
-	if (!ap->ops->error_handler)
-		ap->pflags &= ~ATA_PFLAG_FROZEN;
-	return 0;
-}
-EXPORT_SYMBOL_GPL(ata_sas_port_start);
-
-/**
- *	ata_port_stop - Undo ata_sas_port_start()
- *	@ap: Port to shut down
- *
- *	May be used as the port_stop() entry in ata_port_operations.
- *
- *	LOCKING:
- *	Inherited from caller.
- */
-
-void ata_sas_port_stop(struct ata_port *ap)
-{
-}
-EXPORT_SYMBOL_GPL(ata_sas_port_stop);
-
-/**
- * ata_sas_async_probe - simply schedule probing and return
- * @ap: Port to probe
- *
- * For batch scheduling of probe for sas attached ata devices, assumes
- * the port has already been through ata_sas_port_init()
- */
-void ata_sas_async_probe(struct ata_port *ap)
-{
-	__ata_port_probe(ap);
-}
-EXPORT_SYMBOL_GPL(ata_sas_async_probe);
-
-int ata_sas_sync_probe(struct ata_port *ap)
-{
-	return ata_port_probe(ap);
-}
-EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
-
-
-/**
- *	ata_sas_port_init - Initialize a SATA device
- *	@ap: SATA port to initialize
- *
- *	LOCKING:
- *	PCI/etc. bus probe sem.
- *
- *	RETURNS:
- *	Zero on success, non-zero on error.
- */
-
-int ata_sas_port_init(struct ata_port *ap)
-{
-	int rc = ap->ops->port_start(ap);
-
-	if (rc)
-		return rc;
-	ap->print_id = atomic_inc_return(&ata_print_id);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(ata_sas_port_init);
-
-int ata_sas_tport_add(struct device *parent, struct ata_port *ap)
-{
-	return ata_tport_add(parent, ap);
-}
-EXPORT_SYMBOL_GPL(ata_sas_tport_add);
-
-void ata_sas_tport_delete(struct ata_port *ap)
-{
-	ata_tport_delete(ap);
-}
-EXPORT_SYMBOL_GPL(ata_sas_tport_delete);
-
-/**
- *	ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
- *	@ap: SATA port to destroy
- *
- */
-
-void ata_sas_port_destroy(struct ata_port *ap)
-{
-	if (ap->ops->port_stop)
-		ap->ops->port_stop(ap);
-	kfree(ap);
-}
-EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
-
-/**
- *	ata_sas_slave_configure - Default slave_config routine for libata devices
- *	@sdev: SCSI device to configure
- *	@ap: ATA port to which SCSI device is attached
- *
- *	RETURNS:
- *	Zero.
- */
-
-int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
-{
-	ata_scsi_sdev_config(sdev);
-	ata_scsi_dev_config(sdev, ap->link.device);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
-
-/**
- *	ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
- *	@cmd: SCSI command to be sent
- *	@ap:	ATA port to which the command is being sent
- *
- *	RETURNS:
- *	Return value from __ata_scsi_queuecmd() if @cmd can be queued,
- *	0 otherwise.
- */
-
-int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
-{
-	int rc = 0;
-
-	ata_scsi_dump_cdb(ap, cmd);
-
-	if (likely(ata_dev_enabled(ap->link.device)))
-		rc = __ata_scsi_queuecmd(cmd, ap->link.device);
-	else {
-		cmd->result = (DID_BAD_TARGET << 16);
-		cmd->scsi_done(cmd);
-	}
-	return rc;
-}
-EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
-
-int ata_sas_allocate_tag(struct ata_port *ap)
-{
-	unsigned int max_queue = ap->host->n_tags;
-	unsigned int i, tag;
-
-	for (i = 0, tag = ap->sas_last_tag + 1; i < max_queue; i++, tag++) {
-		tag = tag < max_queue ? tag : 0;
-
-		/* the last tag is reserved for internal command. */
-		if (ata_tag_internal(tag))
-			continue;
-
-		if (!test_and_set_bit(tag, &ap->sas_tag_allocated)) {
-			ap->sas_last_tag = tag;
-			return tag;
-		}
-	}
-	return -1;
-}
-
-void ata_sas_free_tag(unsigned int tag, struct ata_port *ap)
-{
-	clear_bit(tag, &ap->sas_tag_allocated);
-}
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index ce3f3c039572..6c808cf39135 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -87,6 +87,18 @@ extern unsigned int ata_read_log_page(struct ata_device *dev, u8 log,
 
 #define to_ata_port(d) container_of(d, struct ata_port, tdev)
 
+/* libata-sata.c */
+#ifdef CONFIG_SATA_HOST
+int ata_sas_allocate_tag(struct ata_port *ap);
+void ata_sas_free_tag(unsigned int tag, struct ata_port *ap);
+#else
+static inline int ata_sas_allocate_tag(struct ata_port *ap)
+{
+	return -EOPNOTSUPP;
+}
+static inline void ata_sas_free_tag(unsigned int tag, struct ata_port *ap) { }
+#endif
+
 /* libata-acpi.c */
 #ifdef CONFIG_ATA_ACPI
 extern unsigned int ata_acpi_gtf_filter;
@@ -130,9 +142,10 @@ extern void ata_scsi_dev_rescan(struct work_struct *work);
 extern int ata_bus_probe(struct ata_port *ap);
 extern int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
 			      unsigned int id, u64 lun);
-int ata_sas_allocate_tag(struct ata_port *ap);
-void ata_sas_free_tag(unsigned int tag, struct ata_port *ap);
-
+void ata_scsi_sdev_config(struct scsi_device *sdev);
+int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev);
+void ata_scsi_dump_cdb(struct ata_port *ap, struct scsi_cmnd *cmd);
+int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev);
 
 /* libata-eh.c */
 extern unsigned long ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index cc14030c139e..2d81ea2ccf12 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1087,19 +1087,6 @@ extern int ata_scsi_ioctl(struct scsi_device *dev, unsigned int cmd,
 extern int ata_scsi_queuecmd(struct Scsi_Host *h, struct scsi_cmnd *cmd);
 extern int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *dev,
 			    unsigned int cmd, void __user *arg);
-extern void ata_sas_port_destroy(struct ata_port *);
-extern struct ata_port *ata_sas_port_alloc(struct ata_host *,
-					   struct ata_port_info *,
-					   struct Scsi_Host *);
-extern void ata_sas_async_probe(struct ata_port *ap);
-extern int ata_sas_sync_probe(struct ata_port *ap);
-extern int ata_sas_port_init(struct ata_port *);
-extern int ata_sas_port_start(struct ata_port *ap);
-extern int ata_sas_tport_add(struct device *parent, struct ata_port *ap);
-extern void ata_sas_tport_delete(struct ata_port *ap);
-extern void ata_sas_port_stop(struct ata_port *ap);
-extern int ata_sas_slave_configure(struct scsi_device *, struct ata_port *);
-extern int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap);
 extern bool ata_link_online(struct ata_link *link);
 extern bool ata_link_offline(struct ata_link *link);
 #ifdef CONFIG_PM
@@ -1237,6 +1224,19 @@ extern int sata_link_debounce(struct ata_link *link,
 extern int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
                             bool spm_wakeup);
 extern int ata_slave_link_init(struct ata_port *ap);
+extern void ata_sas_port_destroy(struct ata_port *);
+extern struct ata_port *ata_sas_port_alloc(struct ata_host *,
+					   struct ata_port_info *,
+					   struct Scsi_Host *);
+extern void ata_sas_async_probe(struct ata_port *ap);
+extern int ata_sas_sync_probe(struct ata_port *ap);
+extern int ata_sas_port_init(struct ata_port *);
+extern int ata_sas_port_start(struct ata_port *ap);
+extern int ata_sas_tport_add(struct device *parent, struct ata_port *ap);
+extern void ata_sas_tport_delete(struct ata_port *ap);
+extern void ata_sas_port_stop(struct ata_port *ap);
+extern int ata_sas_slave_configure(struct scsi_device *, struct ata_port *);
+extern int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap);
 extern void ata_tf_to_fis(const struct ata_taskfile *tf,
                          u8 pmp, int is_cmd, u8 *fis);
 extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
-- 
2.24.1

[PATCH v4 25/27] ata: start separating SATA specific code from libata-eh.c

[Bartlomiej Zolnierkiewicz]

Start separating SATA specific code from libata-eh.c:

* move sata_async_notification() to libata-sata.c:

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  16243      18       0   16261    3f85 drivers/ata/libata-eh.o
after:
  16164      18       0   16182    3f36 drivers/ata/libata-eh.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-eh.c   | 74 --------------------------------------
 drivers/ata/libata-sata.c | 75 +++++++++++++++++++++++++++++++++++++++
 include/linux/libata.h    |  2 +-
 3 files changed, 76 insertions(+), 75 deletions(-)

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 452c30024f81..9ca777a24117 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -1089,80 +1089,6 @@ int ata_port_freeze(struct ata_port *ap)
 }
 EXPORT_SYMBOL_GPL(ata_port_freeze);
 
-/**
- *	sata_async_notification - SATA async notification handler
- *	@ap: ATA port where async notification is received
- *
- *	Handler to be called when async notification via SDB FIS is
- *	received.  This function schedules EH if necessary.
- *
- *	LOCKING:
- *	spin_lock_irqsave(host lock)
- *
- *	RETURNS:
- *	1 if EH is scheduled, 0 otherwise.
- */
-int sata_async_notification(struct ata_port *ap)
-{
-	u32 sntf;
-	int rc;
-
-	if (!(ap->flags & ATA_FLAG_AN))
-		return 0;
-
-	rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
-	if (rc == 0)
-		sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
-
-	if (!sata_pmp_attached(ap) || rc) {
-		/* PMP is not attached or SNTF is not available */
-		if (!sata_pmp_attached(ap)) {
-			/* PMP is not attached.  Check whether ATAPI
-			 * AN is configured.  If so, notify media
-			 * change.
-			 */
-			struct ata_device *dev = ap->link.device;
-
-			if ((dev->class == ATA_DEV_ATAPI) &&
-			    (dev->flags & ATA_DFLAG_AN))
-				ata_scsi_media_change_notify(dev);
-			return 0;
-		} else {
-			/* PMP is attached but SNTF is not available.
-			 * ATAPI async media change notification is
-			 * not used.  The PMP must be reporting PHY
-			 * status change, schedule EH.
-			 */
-			ata_port_schedule_eh(ap);
-			return 1;
-		}
-	} else {
-		/* PMP is attached and SNTF is available */
-		struct ata_link *link;
-
-		/* check and notify ATAPI AN */
-		ata_for_each_link(link, ap, EDGE) {
-			if (!(sntf & (1 << link->pmp)))
-				continue;
-
-			if ((link->device->class == ATA_DEV_ATAPI) &&
-			    (link->device->flags & ATA_DFLAG_AN))
-				ata_scsi_media_change_notify(link->device);
-		}
-
-		/* If PMP is reporting that PHY status of some
-		 * downstream ports has changed, schedule EH.
-		 */
-		if (sntf & (1 << SATA_PMP_CTRL_PORT)) {
-			ata_port_schedule_eh(ap);
-			return 1;
-		}
-
-		return 0;
-	}
-}
-EXPORT_SYMBOL_GPL(sata_async_notification);
-
 /**
  *	ata_eh_freeze_port - EH helper to freeze port
  *	@ap: ATA port to freeze
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index ad11a77a307c..eff744727dc0 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -4,6 +4,7 @@
  *
  *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
  *  Copyright 2003-2004 Jeff Garzik
+ *  Copyright 2006 Tejun Heo <htejun@gmail.com>
  */
 
 #include <linux/kernel.h>
@@ -1272,3 +1273,77 @@ void ata_sas_free_tag(unsigned int tag, struct ata_port *ap)
 {
 	clear_bit(tag, &ap->sas_tag_allocated);
 }
+
+/**
+ *	sata_async_notification - SATA async notification handler
+ *	@ap: ATA port where async notification is received
+ *
+ *	Handler to be called when async notification via SDB FIS is
+ *	received.  This function schedules EH if necessary.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ *
+ *	RETURNS:
+ *	1 if EH is scheduled, 0 otherwise.
+ */
+int sata_async_notification(struct ata_port *ap)
+{
+	u32 sntf;
+	int rc;
+
+	if (!(ap->flags & ATA_FLAG_AN))
+		return 0;
+
+	rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
+	if (rc == 0)
+		sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
+
+	if (!sata_pmp_attached(ap) || rc) {
+		/* PMP is not attached or SNTF is not available */
+		if (!sata_pmp_attached(ap)) {
+			/* PMP is not attached.  Check whether ATAPI
+			 * AN is configured.  If so, notify media
+			 * change.
+			 */
+			struct ata_device *dev = ap->link.device;
+
+			if ((dev->class == ATA_DEV_ATAPI) &&
+			    (dev->flags & ATA_DFLAG_AN))
+				ata_scsi_media_change_notify(dev);
+			return 0;
+		} else {
+			/* PMP is attached but SNTF is not available.
+			 * ATAPI async media change notification is
+			 * not used.  The PMP must be reporting PHY
+			 * status change, schedule EH.
+			 */
+			ata_port_schedule_eh(ap);
+			return 1;
+		}
+	} else {
+		/* PMP is attached and SNTF is available */
+		struct ata_link *link;
+
+		/* check and notify ATAPI AN */
+		ata_for_each_link(link, ap, EDGE) {
+			if (!(sntf & (1 << link->pmp)))
+				continue;
+
+			if ((link->device->class == ATA_DEV_ATAPI) &&
+			    (link->device->flags & ATA_DFLAG_AN))
+				ata_scsi_media_change_notify(link->device);
+		}
+
+		/* If PMP is reporting that PHY status of some
+		 * downstream ports has changed, schedule EH.
+		 */
+		if (sntf & (1 << SATA_PMP_CTRL_PORT)) {
+			ata_port_schedule_eh(ap);
+			return 1;
+		}
+
+		return 0;
+	}
+}
+EXPORT_SYMBOL_GPL(sata_async_notification);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 2d81ea2ccf12..556fc5d367aa 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1242,6 +1242,7 @@ extern void ata_tf_to_fis(const struct ata_taskfile *tf,
 extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
 extern int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active);
 extern bool sata_lpm_ignore_phy_events(struct ata_link *link);
+extern int sata_async_notification(struct ata_port *ap);
 
 extern int ata_cable_40wire(struct ata_port *ap);
 extern int ata_cable_80wire(struct ata_port *ap);
@@ -1335,7 +1336,6 @@ extern void ata_port_wait_eh(struct ata_port *ap);
 extern int ata_link_abort(struct ata_link *link);
 extern int ata_port_abort(struct ata_port *ap);
 extern int ata_port_freeze(struct ata_port *ap);
-extern int sata_async_notification(struct ata_port *ap);
 
 extern void ata_eh_freeze_port(struct ata_port *ap);
 extern void ata_eh_thaw_port(struct ata_port *ap);
-- 
2.24.1

[PATCH v4 26/27] ata: move ata_eh_analyze_ncq_error() & co. to libata-sata.c

[Bartlomiej Zolnierkiewicz]

* move ata_eh_analyze_ncq_error() and ata_eh_read_log_10h() to
  libata-sata.c

* add static inline for ata_eh_analyze_ncq_error() for
  CONFIG_SATA_HOST=n case (link->sactive is non-zero only if
  NCQ commands are actually queued so empty function body is
  sufficient)

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  16164      18       0   16182    3f36 drivers/ata/libata-eh.o
after:
  15446      18       0   15464    3c68 drivers/ata/libata-eh.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-eh.c   | 131 --------------------------------------
 drivers/ata/libata-sata.c | 131 ++++++++++++++++++++++++++++++++++++++
 include/linux/libata.h    |   3 +-
 3 files changed, 133 insertions(+), 132 deletions(-)

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 9ca777a24117..702f4aa4d509 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -1352,62 +1352,6 @@ static const char *ata_err_string(unsigned int err_mask)
 	return "unknown error";
 }
 
-/**
- *	ata_eh_read_log_10h - Read log page 10h for NCQ error details
- *	@dev: Device to read log page 10h from
- *	@tag: Resulting tag of the failed command
- *	@tf: Resulting taskfile registers of the failed command
- *
- *	Read log page 10h to obtain NCQ error details and clear error
- *	condition.
- *
- *	LOCKING:
- *	Kernel thread context (may sleep).
- *
- *	RETURNS:
- *	0 on success, -errno otherwise.
- */
-static int ata_eh_read_log_10h(struct ata_device *dev,
-			       int *tag, struct ata_taskfile *tf)
-{
-	u8 *buf = dev->link->ap->sector_buf;
-	unsigned int err_mask;
-	u8 csum;
-	int i;
-
-	err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, 0, buf, 1);
-	if (err_mask)
-		return -EIO;
-
-	csum = 0;
-	for (i = 0; i < ATA_SECT_SIZE; i++)
-		csum += buf[i];
-	if (csum)
-		ata_dev_warn(dev, "invalid checksum 0x%x on log page 10h\n",
-			     csum);
-
-	if (buf[0] & 0x80)
-		return -ENOENT;
-
-	*tag = buf[0] & 0x1f;
-
-	tf->command = buf[2];
-	tf->feature = buf[3];
-	tf->lbal = buf[4];
-	tf->lbam = buf[5];
-	tf->lbah = buf[6];
-	tf->device = buf[7];
-	tf->hob_lbal = buf[8];
-	tf->hob_lbam = buf[9];
-	tf->hob_lbah = buf[10];
-	tf->nsect = buf[12];
-	tf->hob_nsect = buf[13];
-	if (dev->class == ATA_DEV_ZAC && ata_id_has_ncq_autosense(dev->id))
-		tf->auxiliary = buf[14] << 16 | buf[15] << 8 | buf[16];
-
-	return 0;
-}
-
 /**
  *	atapi_eh_tur - perform ATAPI TEST_UNIT_READY
  *	@dev: target ATAPI device
@@ -1587,81 +1531,6 @@ static void ata_eh_analyze_serror(struct ata_link *link)
 	ehc->i.action |= action;
 }
 
-/**
- *	ata_eh_analyze_ncq_error - analyze NCQ error
- *	@link: ATA link to analyze NCQ error for
- *
- *	Read log page 10h, determine the offending qc and acquire
- *	error status TF.  For NCQ device errors, all LLDDs have to do
- *	is setting AC_ERR_DEV in ehi->err_mask.  This function takes
- *	care of the rest.
- *
- *	LOCKING:
- *	Kernel thread context (may sleep).
- */
-void ata_eh_analyze_ncq_error(struct ata_link *link)
-{
-	struct ata_port *ap = link->ap;
-	struct ata_eh_context *ehc = &link->eh_context;
-	struct ata_device *dev = link->device;
-	struct ata_queued_cmd *qc;
-	struct ata_taskfile tf;
-	int tag, rc;
-
-	/* if frozen, we can't do much */
-	if (ap->pflags & ATA_PFLAG_FROZEN)
-		return;
-
-	/* is it NCQ device error? */
-	if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
-		return;
-
-	/* has LLDD analyzed already? */
-	ata_qc_for_each_raw(ap, qc, tag) {
-		if (!(qc->flags & ATA_QCFLAG_FAILED))
-			continue;
-
-		if (qc->err_mask)
-			return;
-	}
-
-	/* okay, this error is ours */
-	memset(&tf, 0, sizeof(tf));
-	rc = ata_eh_read_log_10h(dev, &tag, &tf);
-	if (rc) {
-		ata_link_err(link, "failed to read log page 10h (errno=%d)\n",
-			     rc);
-		return;
-	}
-
-	if (!(link->sactive & (1 << tag))) {
-		ata_link_err(link, "log page 10h reported inactive tag %d\n",
-			     tag);
-		return;
-	}
-
-	/* we've got the perpetrator, condemn it */
-	qc = __ata_qc_from_tag(ap, tag);
-	memcpy(&qc->result_tf, &tf, sizeof(tf));
-	qc->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
-	qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ;
-	if (dev->class == ATA_DEV_ZAC &&
-	    ((qc->result_tf.command & ATA_SENSE) || qc->result_tf.auxiliary)) {
-		char sense_key, asc, ascq;
-
-		sense_key = (qc->result_tf.auxiliary >> 16) & 0xff;
-		asc = (qc->result_tf.auxiliary >> 8) & 0xff;
-		ascq = qc->result_tf.auxiliary & 0xff;
-		ata_scsi_set_sense(dev, qc->scsicmd, sense_key, asc, ascq);
-		ata_scsi_set_sense_information(dev, qc->scsicmd,
-					       &qc->result_tf);
-		qc->flags |= ATA_QCFLAG_SENSE_VALID;
-	}
-
-	ehc->i.err_mask &= ~AC_ERR_DEV;
-}
-EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
-
 /**
  *	ata_eh_analyze_tf - analyze taskfile of a failed qc
  *	@qc: qc to analyze
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index eff744727dc0..13c105912167 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -1347,3 +1347,134 @@ int sata_async_notification(struct ata_port *ap)
 	}
 }
 EXPORT_SYMBOL_GPL(sata_async_notification);
+
+/**
+ *	ata_eh_read_log_10h - Read log page 10h for NCQ error details
+ *	@dev: Device to read log page 10h from
+ *	@tag: Resulting tag of the failed command
+ *	@tf: Resulting taskfile registers of the failed command
+ *
+ *	Read log page 10h to obtain NCQ error details and clear error
+ *	condition.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+static int ata_eh_read_log_10h(struct ata_device *dev,
+			       int *tag, struct ata_taskfile *tf)
+{
+	u8 *buf = dev->link->ap->sector_buf;
+	unsigned int err_mask;
+	u8 csum;
+	int i;
+
+	err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, 0, buf, 1);
+	if (err_mask)
+		return -EIO;
+
+	csum = 0;
+	for (i = 0; i < ATA_SECT_SIZE; i++)
+		csum += buf[i];
+	if (csum)
+		ata_dev_warn(dev, "invalid checksum 0x%x on log page 10h\n",
+			     csum);
+
+	if (buf[0] & 0x80)
+		return -ENOENT;
+
+	*tag = buf[0] & 0x1f;
+
+	tf->command = buf[2];
+	tf->feature = buf[3];
+	tf->lbal = buf[4];
+	tf->lbam = buf[5];
+	tf->lbah = buf[6];
+	tf->device = buf[7];
+	tf->hob_lbal = buf[8];
+	tf->hob_lbam = buf[9];
+	tf->hob_lbah = buf[10];
+	tf->nsect = buf[12];
+	tf->hob_nsect = buf[13];
+	if (dev->class == ATA_DEV_ZAC && ata_id_has_ncq_autosense(dev->id))
+		tf->auxiliary = buf[14] << 16 | buf[15] << 8 | buf[16];
+
+	return 0;
+}
+
+/**
+ *	ata_eh_analyze_ncq_error - analyze NCQ error
+ *	@link: ATA link to analyze NCQ error for
+ *
+ *	Read log page 10h, determine the offending qc and acquire
+ *	error status TF.  For NCQ device errors, all LLDDs have to do
+ *	is setting AC_ERR_DEV in ehi->err_mask.  This function takes
+ *	care of the rest.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_eh_analyze_ncq_error(struct ata_link *link)
+{
+	struct ata_port *ap = link->ap;
+	struct ata_eh_context *ehc = &link->eh_context;
+	struct ata_device *dev = link->device;
+	struct ata_queued_cmd *qc;
+	struct ata_taskfile tf;
+	int tag, rc;
+
+	/* if frozen, we can't do much */
+	if (ap->pflags & ATA_PFLAG_FROZEN)
+		return;
+
+	/* is it NCQ device error? */
+	if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
+		return;
+
+	/* has LLDD analyzed already? */
+	ata_qc_for_each_raw(ap, qc, tag) {
+		if (!(qc->flags & ATA_QCFLAG_FAILED))
+			continue;
+
+		if (qc->err_mask)
+			return;
+	}
+
+	/* okay, this error is ours */
+	memset(&tf, 0, sizeof(tf));
+	rc = ata_eh_read_log_10h(dev, &tag, &tf);
+	if (rc) {
+		ata_link_err(link, "failed to read log page 10h (errno=%d)\n",
+			     rc);
+		return;
+	}
+
+	if (!(link->sactive & (1 << tag))) {
+		ata_link_err(link, "log page 10h reported inactive tag %d\n",
+			     tag);
+		return;
+	}
+
+	/* we've got the perpetrator, condemn it */
+	qc = __ata_qc_from_tag(ap, tag);
+	memcpy(&qc->result_tf, &tf, sizeof(tf));
+	qc->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
+	qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ;
+	if (dev->class == ATA_DEV_ZAC &&
+	    ((qc->result_tf.command & ATA_SENSE) || qc->result_tf.auxiliary)) {
+		char sense_key, asc, ascq;
+
+		sense_key = (qc->result_tf.auxiliary >> 16) & 0xff;
+		asc = (qc->result_tf.auxiliary >> 8) & 0xff;
+		ascq = qc->result_tf.auxiliary & 0xff;
+		ata_scsi_set_sense(dev, qc->scsicmd, sense_key, asc, ascq);
+		ata_scsi_set_sense_information(dev, qc->scsicmd,
+					       &qc->result_tf);
+		qc->flags |= ATA_QCFLAG_SENSE_VALID;
+	}
+
+	ehc->i.err_mask &= ~AC_ERR_DEV;
+}
+EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 556fc5d367aa..422bb71f3bf5 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1182,6 +1182,7 @@ extern int sata_link_hardreset(struct ata_link *link,
 			bool *online, int (*check_ready)(struct ata_link *));
 extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
 			    unsigned long deadline);
+extern void ata_eh_analyze_ncq_error(struct ata_link *link);
 #else
 static inline const unsigned long *
 sata_ehc_deb_timing(struct ata_eh_context *ehc)
@@ -1218,6 +1219,7 @@ static inline int sata_link_resume(struct ata_link *link,
 {
 	return -EOPNOTSUPP;
 }
+static inline void ata_eh_analyze_ncq_error(struct ata_link *link) { }
 #endif
 extern int sata_link_debounce(struct ata_link *link,
 			const unsigned long *params, unsigned long deadline);
@@ -1342,7 +1344,6 @@ extern void ata_eh_thaw_port(struct ata_port *ap);
 
 extern void ata_eh_qc_complete(struct ata_queued_cmd *qc);
 extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
-extern void ata_eh_analyze_ncq_error(struct ata_link *link);
 
 extern void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
 		      ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
-- 
2.24.1

[PATCH v4 27/27] ata: make "libata.force" kernel parameter optional

[Bartlomiej Zolnierkiewicz]

Add ATA_FORCE config option (visible only if EXPERT config
option is enabled) and make "libata.force" kernel parameter
optional.

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
w/ CONFIG_ATA_FORCE=y:
  31983     572      40   32595    7f53 drivers/ata/libata-core.o
w/ CONFIG_ATA_FROCE=n:
  28958     316      32   29306    727a drivers/ata/libata-core.o

Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/Kconfig       | 16 ++++++++++++++++
 drivers/ata/libata-core.c | 22 ++++++++++++++++++++--
 drivers/ata/libata.h      |  4 ++++
 3 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 5b55ebf56b5a..05ecdce1b702 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -51,6 +51,22 @@ config ATA_VERBOSE_ERROR
 
 	  If unsure, say Y.
 
+config ATA_FORCE
+	bool "\"libata.force=\" kernel parameter support" if EXPERT
+	default y
+	help
+	  This option adds support for "libata.force=" kernel parameter for
+	  forcing configuration settings.
+
+	  For further information, please read
+	  <file:Documentation/admin-guide/kernel-parameters.txt>.
+
+	  This option will enlarge the kernel by approx. 3KB. Disable it if
+	  kernel size is more important than ability to override the default
+	  configuration settings.
+
+	  If unsure, say Y.
+
 config ATA_ACPI
 	bool "ATA ACPI Support"
 	depends on ACPI
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 53d1d017c752..ce7d747dd2c0 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -89,6 +89,7 @@ static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
 
 atomic_t ata_print_id = ATOMIC_INIT(0);
 
+#ifdef CONFIG_ATA_FORCE
 struct ata_force_param {
 	const char	*name;
 	u8		cbl;
@@ -112,6 +113,7 @@ static char ata_force_param_buf[COMMAND_LINE_SIZE] __initdata;
 /* param_buf is thrown away after initialization, disallow read */
 module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
 MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/admin-guide/kernel-parameters.rst for details)");
+#endif
 
 static int atapi_enabled = 1;
 module_param(atapi_enabled, int, 0444);
@@ -303,6 +305,7 @@ struct ata_link *ata_dev_phys_link(struct ata_device *dev)
 	return ap->slave_link;
 }
 
+#ifdef CONFIG_ATA_FORCE
 /**
  *	ata_force_cbl - force cable type according to libata.force
  *	@ap: ATA port of interest
@@ -483,6 +486,11 @@ static void ata_force_horkage(struct ata_device *dev)
 			       fe->param.name);
 	}
 }
+#else
+static inline void ata_force_link_limits(struct ata_link *link) { }
+static inline void ata_force_xfermask(struct ata_device *dev) { }
+static inline void ata_force_horkage(struct ata_device *dev) { }
+#endif
 
 /**
  *	atapi_cmd_type - Determine ATAPI command type from SCSI opcode
@@ -6080,6 +6088,7 @@ int ata_platform_remove_one(struct platform_device *pdev)
 }
 EXPORT_SYMBOL_GPL(ata_platform_remove_one);
 
+#ifdef CONFIG_ATA_FORCE
 static int __init ata_parse_force_one(char **cur,
 				      struct ata_force_ent *force_ent,
 				      const char **reason)
@@ -6259,6 +6268,15 @@ static void __init ata_parse_force_param(void)
 	ata_force_tbl_size = idx;
 }
 
+static void ata_free_force_param(void)
+{
+	kfree(ata_force_tbl);
+}
+#else
+static inline void ata_parse_force_param(void) { }
+static inline void ata_free_force_param(void) { }
+#endif
+
 static int __init ata_init(void)
 {
 	int rc;
@@ -6267,7 +6285,7 @@ static int __init ata_init(void)
 
 	rc = ata_sff_init();
 	if (rc) {
-		kfree(ata_force_tbl);
+		ata_free_force_param();
 		return rc;
 	}
 
@@ -6291,7 +6309,7 @@ static void __exit ata_exit(void)
 	ata_release_transport(ata_scsi_transport_template);
 	libata_transport_exit();
 	ata_sff_exit();
-	kfree(ata_force_tbl);
+	ata_free_force_param();
 }
 
 subsys_initcall(ata_init);
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 6c808cf39135..68cdd81d747c 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -37,7 +37,11 @@ extern int libata_noacpi;
 extern int libata_allow_tpm;
 extern const struct device_type ata_port_type;
 extern struct ata_link *ata_dev_phys_link(struct ata_device *dev);
+#ifdef CONFIG_ATA_FORCE
 extern void ata_force_cbl(struct ata_port *ap);
+#else
+static inline void ata_force_cbl(struct ata_port *ap) { }
+#endif
 extern u64 ata_tf_to_lba(const struct ata_taskfile *tf);
 extern u64 ata_tf_to_lba48(const struct ata_taskfile *tf);
 extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev, int tag);
-- 
2.24.1

Re: [PATCH v4 03/27] ata: make SATA_PMP option selectable only if any SATA host driver is enabled

[James Bottomley]

On Tue, 2020-03-17 at 15:43 +0100, Bartlomiej Zolnierkiewicz wrote:
> There is no reason to expose SATA_PMP config option when no SATA
> host drivers are enabled. To fix it add SATA_HOST config option,
> make all SATA host drivers select it and finally make SATA_PMP
> config options depend on it.
> 
> This also serves as preparation for the future changes which
> optimize libata core code size on PATA only setups.
> 
> CC: "James E.J. Bottomley" <jejb@linux.ibm.com>
> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> # for
> SCSI bits
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> ---
>  drivers/ata/Kconfig         | 40
> +++++++++++++++++++++++++++++++++++++
>  drivers/scsi/Kconfig        |  1 +
>  drivers/scsi/libsas/Kconfig |  1 +
>  3 files changed, 42 insertions(+)
> 
> diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
> index a6beb2c5a692..ad7760656f71 100644
> --- a/drivers/ata/Kconfig
> +++ b/drivers/ata/Kconfig
> @@ -34,6 +34,9 @@ if ATA
>  config ATA_NONSTANDARD
>         bool
>  
> +config SATA_HOST
> +	bool
> +
>  config ATA_VERBOSE_ERROR
>  	bool "Verbose ATA error reporting"
>  	default y
> @@ -73,6 +76,7 @@ config SATA_ZPODD
>  
>  config SATA_PMP
>  	bool "SATA Port Multiplier support"
> +	depends on SATA_HOST
>  	default y
>  	help
>  	  This option adds support for SATA Port Multipliers
> @@ -85,6 +89,7 @@ comment "Controllers with non-SFF native interface"
>  config SATA_AHCI
>  	tristate "AHCI SATA support"
>  	depends on PCI
> +	select SATA_HOST
>  	help
>  	  This option enables support for AHCI Serial ATA.

This is a bit fragile and not the way Kconfig should be done.  The
fragility comes because anyone adding a new host has also to remember
to add the select, and there will be no real consequences for not doing
so.  The way to get rid of the fragility is to make SATA_HOST a
menuconfig option enclosing all the hosts, which makes the patch much
smaller as well.  The hint implies you want to separate out all the
PATA drivers, which also makes a menuconfig sound like the better
option.

I've also got to say that the problem doesn't seem to be one ... even
if some raving lunatic disables all SATA hosts and then enables PMP it
doesn't cause any problems does it?

James

Re: [PATCH v4 03/27] ata: make SATA_PMP option selectable only if any SATA host driver is enabled

[Bartlomiej Zolnierkiewicz]

On 3/17/20 3:55 PM, James Bottomley wrote:
> On Tue, 2020-03-17 at 15:43 +0100, Bartlomiej Zolnierkiewicz wrote:
>> There is no reason to expose SATA_PMP config option when no SATA
>> host drivers are enabled. To fix it add SATA_HOST config option,
>> make all SATA host drivers select it and finally make SATA_PMP
>> config options depend on it.
>>
>> This also serves as preparation for the future changes which
>> optimize libata core code size on PATA only setups.
>>
>> CC: "James E.J. Bottomley" <jejb@linux.ibm.com>
>> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> # for
>> SCSI bits
>> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
>> ---
>>  drivers/ata/Kconfig         | 40
>> +++++++++++++++++++++++++++++++++++++
>>  drivers/scsi/Kconfig        |  1 +
>>  drivers/scsi/libsas/Kconfig |  1 +
>>  3 files changed, 42 insertions(+)
>>
>> diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
>> index a6beb2c5a692..ad7760656f71 100644
>> --- a/drivers/ata/Kconfig
>> +++ b/drivers/ata/Kconfig
>> @@ -34,6 +34,9 @@ if ATA
>>  config ATA_NONSTANDARD
>>         bool
>>  
>> +config SATA_HOST
>> +	bool
>> +
>>  config ATA_VERBOSE_ERROR
>>  	bool "Verbose ATA error reporting"
>>  	default y
>> @@ -73,6 +76,7 @@ config SATA_ZPODD
>>  
>>  config SATA_PMP
>>  	bool "SATA Port Multiplier support"
>> +	depends on SATA_HOST
>>  	default y
>>  	help
>>  	  This option adds support for SATA Port Multipliers
>> @@ -85,6 +89,7 @@ comment "Controllers with non-SFF native interface"
>>  config SATA_AHCI
>>  	tristate "AHCI SATA support"
>>  	depends on PCI
>> +	select SATA_HOST
>>  	help
>>  	  This option enables support for AHCI Serial ATA.
> 
> This is a bit fragile and not the way Kconfig should be done.  The
> fragility comes because anyone adding a new host has also to remember
> to add the select, and there will be no real consequences for not doing

People adding the new host driver usually look at the existing Kconfig
entries before introducing the new one (most probably just copy and then
modify existing entry) so they should notice that the existing entries
contain the select.

Also we shouldn't have problem in catching potential select omissions
during the code review.

Not to mention that the addition of the new ATA host driver is quite
a rare event nowadays.. ;)

> so.  The way to get rid of the fragility is to make SATA_HOST a
> menuconfig option enclosing all the hosts, which makes the patch much
> smaller as well.  The hint implies you want to separate out all the
> PATA drivers, which also makes a menuconfig sound like the better
> option.
SATA_HOST is not for grouping SATA hosts, it is for core libata
code to enable SATA support (please see patches #13-26 for details,
maybe it should have been named ATA_SATA?) and menuconfig usage in
this case is problematic:

- we have host drivers supporting both SATA and PATA (i.e. ata_piix)

- we have currently host drivers sorted in Kconfig by different 
  criteria than SATA or PATA support

- I would prefer to avoid making users to have explicitly select
  SATA_HOST option (right now it gets auto-selected when needed)

- SCSI_SAS_ATA (which also needs to select SATA_HOST) lives in
  drivers/scsi/libsas/Kconfig so menuconfig will not cover it

> I've also got to say that the problem doesn't seem to be one ... even
> if some raving lunatic disables all SATA hosts and then enables PMP it
> doesn't cause any problems does it?

It doesn't cause any real problems (just some dead code being present
in the kernel image) but this patch is a prerequisite for patches #13-26
(patch description mentions that this change is needed for the future
changes which optimize libata core code size on PATA only setups).

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

Re: [PATCH v4 02/27] ata: expose ncq_enable_prio sysfs attribute only on NCQ capable hosts

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:08PM +0100, Bartlomiej Zolnierkiewicz wrote:
> There is no point in exposing ncq_enable_prio sysfs attribute for
> devices on PATA and non-NCQ capable SATA hosts so:
> 
> * remove dev_attr_ncq_prio_enable from ata_common_sdev_attrs[]
> 
> * add ata_ncq_sdev_attrs[]
> 
> * update ATA_NCQ_SHT() macro to use ata_ncq_sdev_attrs[]
> 
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 03/27] ata: make SATA_PMP option selectable only if any SATA host driver is enabled

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:09PM +0100, Bartlomiej Zolnierkiewicz wrote:
> There is no reason to expose SATA_PMP config option when no SATA
> host drivers are enabled. To fix it add SATA_HOST config option,
> make all SATA host drivers select it and finally make SATA_PMP
> config options depend on it.
> 
> This also serves as preparation for the future changes which
> optimize libata core code size on PATA only setups.
> 
> CC: "James E.J. Bottomley" <jejb@linux.ibm.com>
> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> # for SCSI bits
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 04/27] sata_promise: use ata_cable_sata()

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:10PM +0100, Bartlomiej Zolnierkiewicz wrote:
> Use core helper instead of open-coding it.
> 
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 08/27] ata: optimize ata_scsi_rbuf[] size

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:14PM +0100, Bartlomiej Zolnierkiewicz wrote:
> Currently the maximum required size of the ata_scsi_rbuf[] is
> 576 bytes in ata_scsiop_inq_89() so modify ATA_SCSI_RBUF_SIZE
> define accordingly.

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Btw, I wonder if we should switch this to a dynamic allocation, as
a lot of people are more concerned about kernel size footprint vs
dynamic allocations.

Re: [PATCH v4 11/27] ata: fix CodingStyle issues in PATA timings code

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:17PM +0100, Bartlomiej Zolnierkiewicz wrote:
> * fix the overly long line in ata_timing_quantize()
> 
> * use standard kernel CodingStyle in ata_timing_merge()
> 
> * do not use assignment in if condition in ata_timing_compute()
> 
> * fix non-standard comment style in ata_timing_compute()
> 
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 12/27] ata: separate PATA timings code from libata-core.c

[Christoph Hellwig]

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 13/27] ata: add CONFIG_SATA_HOST=n version of ata_ncq_enabled()

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:19PM +0100, Bartlomiej Zolnierkiewicz wrote:
> When CONFIG_SATA_HOST=n there are no NCQ capable host drivers
> built so it is safe to hardwire ata_ncq_enabled() to always
> return zero.

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 14/27] ata: let compiler optimize out ata_dev_config_ncq() on non-SATA hosts

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:20PM +0100, Bartlomiej Zolnierkiewicz wrote:
> Add !IS_ENABLED(CONFIG_SATA_HOST) to ata_dev_config_ncq() to allow
> compiler to optimize out the function for non-SATA configs.

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 15/27] ata: let compiler optimize out ata_eh_set_lpm() on non-SATA hosts

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:21PM +0100, Bartlomiej Zolnierkiewicz wrote:
> Add !IS_ENABLED(CONFIG_SATA_HOST) to ata_eh_set_lpm() to allow
> compiler to optimize out the function for non-SATA configs (for
> PATA hosts "ap && !ap->ops->set_lpm" condition is always true so
> it's sufficient for the function to return zero).

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 16/27] ata: start separating SATA specific code from libata-core.c

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:22PM +0100, Bartlomiej Zolnierkiewicz wrote:
> Start separating SATA specific code from libata-core.c:
> 
> * move following functions to libata-sata.c:
>   - ata_tf_to_fis()
>   - ata_tf_from_fis()
>   - sata_link_scr_lpm()
>   - ata_slave_link_init()
>   - sata_lpm_ignore_phy_events()
> 
> * group above functions together in <linux/libata.h>
> 
> * include libata-sata.c in the build when CONFIG_SATA_HOST=y

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 17/27] ata: move sata_scr_*() to libata-sata.c

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:23PM +0100, Bartlomiej Zolnierkiewicz wrote:
> * move sata_scr_*() to libata-sata.c
> 
> * add static inlines for CONFIG_SATA_HOST=n case

Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 18/27] ata: move *sata_set_spd*() to libata-sata.c

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:24PM +0100, Bartlomiej Zolnierkiewicz wrote:
> * move *sata_set_spd*() to libata-sata.c
> 
> * add static inlines for CONFIG_SATA_HOST=n case

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 19/27] ata: move sata_link_{debounce,resume}() to libata-sata.c

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:25PM +0100, Bartlomiej Zolnierkiewicz wrote:
> * move sata_link_{debounce,resume}() to libata-sata.c
> 
> * add static inline for CONFIG_SATA_HOST=n case (only one,
>   for sata_link_resume() is needed)

This looks good for now:

Reviewed-by: Christoph Hellwig <hch@lst.de>

But as a follow on I think it would make sene to just split
ata_std_prereset into a pata and a sata version, and then we don't
even need the non-static and potentially stubeed out sata_link_resume.

Re: [PATCH v4 20/27] ata: move sata_link_hardreset() to libata-sata.c

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:26PM +0100, Bartlomiej Zolnierkiewicz wrote:
> * move sata_link_hardreset() to libata-sata.c
> 
> * add static inline for CONFIG_SATA_HOST=n case
> 
> * make sata_set_spd_needed() static

Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 21/27] ata: move ata_qc_complete_multiple() to libata-sata.c

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:27PM +0100, Bartlomiej Zolnierkiewicz wrote:
> * move ata_qc_complete_multiple() to libata-sata.c

Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 22/27] ata: move sata_deb_timing_*() to libata-sata.c

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:28PM +0100, Bartlomiej Zolnierkiewicz wrote:
> * move sata_deb_timing_*() to libata-sata.c
> 
> * add static inline for sata_ehc_deb_timing() for
>   CONFIG_SATA_HOST=n case

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 23/27] ata: start separating SATA specific code from libata-scsi.c

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:29PM +0100, Bartlomiej Zolnierkiewicz wrote:
> Start separating SATA specific code from libata-scsi.c:
> 
> * un-static ata_scsi_find_dev()
> 
> * move following code to libata-sata.c:
>   - SATA only sysfs device attributes handling
>   - __ata_change_queue_depth()
>   - ata_scsi_change_queue_depth()
> 
> * cover with CONFIG_SATA_HOST ifdef SATA only sysfs device
>   attributes handling code and ATA_SHT_NCQ() macro in
>   <linux/libata.h>

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 24/27] ata: move ata_sas_*() to libata-sata.c

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:30PM +0100, Bartlomiej Zolnierkiewicz wrote:
> * un-inline:
>   - ata_scsi_dump_cdb()
>   - __ata_scsi_queuecmd()
> 
> * un-static:
>   - ata_scsi_sdev_config()
>   - ata_scsi_dev_config()
>   - ata_scsi_dump_cdb()
>   - __ata_scsi_queuecmd()
> 
> * move ata_sas_*() to libata-sata.c:
> 
> * add static inlines for CONFIG_SATA_HOST=n case for
>   ata_sas_{allocate,free}_tag()

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 25/27] ata: start separating SATA specific code from libata-eh.c

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:31PM +0100, Bartlomiej Zolnierkiewicz wrote:
> Start separating SATA specific code from libata-eh.c:
> 
> * move sata_async_notification() to libata-sata.c:

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 26/27] ata: move ata_eh_analyze_ncq_error() & co. to libata-sata.c

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:32PM +0100, Bartlomiej Zolnierkiewicz wrote:
> * move ata_eh_analyze_ncq_error() and ata_eh_read_log_10h() to
>   libata-sata.c
> 
> * add static inline for ata_eh_analyze_ncq_error() for
>   CONFIG_SATA_HOST=n case (link->sactive is non-zero only if
>   NCQ commands are actually queued so empty function body is
>   sufficient)

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 27/27] ata: make "libata.force" kernel parameter optional

[Christoph Hellwig]

On Tue, Mar 17, 2020 at 03:43:33PM +0100, Bartlomiej Zolnierkiewicz wrote:
> Add ATA_FORCE config option (visible only if EXPERT config
> option is enabled) and make "libata.force" kernel parameter
> optional.

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v4 00/27] ata: optimize core code size on PATA only setups

[Jens Axboe]

On 3/17/20 8:43 AM, Bartlomiej Zolnierkiewicz wrote:
> Hi,
> 
> There have been reports in the past of libata core code size
> being a problem in migration from deprecated IDE subsystem on
> legacy PATA only systems, i.e.:
> 
> https://lore.kernel.org/linux-ide/db2838b7-4862-785b-3a1d-3bf09811340a@gmail.com/
> 
> This patchset re-organizes libata core code to exclude SATA
> specific code from being built for PATA only setups.
> 
> The end result is up to 24% (by 23949 bytes, from 101769 bytes to
> 77820 bytes) smaller libata core code size (as measured for m68k
> arch using modified atari_defconfig) on affected setups.
> 
> I've tested this patchset using pata_falcon driver under ARAnyM
> emulator.

Bart, I'd like to get this into 5.7, can you rebase on current
for-5.7/libata? As you know, I dropped the dprintk series, and it's
now throwing rejects.

-- 
Jens Axboe

Re: [PATCH v4 00/27] ata: optimize core code size on PATA only setups

[Bartlomiej Zolnierkiewicz]

On 3/26/20 4:16 PM, Jens Axboe wrote:
> On 3/17/20 8:43 AM, Bartlomiej Zolnierkiewicz wrote:
>> Hi,
>>
>> There have been reports in the past of libata core code size
>> being a problem in migration from deprecated IDE subsystem on
>> legacy PATA only systems, i.e.:
>>
>> https://lore.kernel.org/linux-ide/db2838b7-4862-785b-3a1d-3bf09811340a@gmail.com/
>>
>> This patchset re-organizes libata core code to exclude SATA
>> specific code from being built for PATA only setups.
>>
>> The end result is up to 24% (by 23949 bytes, from 101769 bytes to
>> 77820 bytes) smaller libata core code size (as measured for m68k
>> arch using modified atari_defconfig) on affected setups.
>>
>> I've tested this patchset using pata_falcon driver under ARAnyM
>> emulator.
> 
> Bart, I'd like to get this into 5.7, can you rebase on current
> for-5.7/libata? As you know, I dropped the dprintk series, and it's
> now throwing rejects.

Sure, I've just posted v5 (I've rebased it on today's -next and
added Reviewed-by tags from Christoph).

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics