[PATCH v4 00/10] PCI: Add and use constant PCI_STATUS_ERROR_BITS and helper pci_status_get_and_clear_errors

[PATCH v4 00/10] PCI: Add and use constant PCI_STATUS_ERROR_BITS and helper pci_status_get_and_clear_errors

[Heiner Kallweit]

Several drivers have own definitions for this constant, so move it
to the PCI core. In addition in multiple places the following code
sequence is used:
1. Read PCI_STATUS
2. Mask out non-error bits
3. Action based on set error bits
4. Write back set error bits to clear them

As this is a repeated pattern, add a helper to the PCI core.

Most affected drivers are network drivers. But as it's about core
PCI functionality, I suppose the series should go through the PCI
tree.

v2:
- fix formal issue with cover letter
v3:
- fix dumb typo in patch 7
v4:
- add patches 1-3
- move new constant PCI_STATUS_ERROR_BITS to include/linux/pci.h
- small improvements in commit messages

Heiner Kallweit (10):
  net: marvell: add PCI_STATUS_SIG_TARGET_ABORT to PCI status error bits
  net: skfp: add PCI_STATUS_REC_TARGET_ABORT to PCI status error bits
  r8169: add PCI_STATUS_PARITY to PCI status error bits
  PCI: Add constant PCI_STATUS_ERROR_BITS
  PCI: Add pci_status_get_and_clear_errors
  r8169: use pci_status_get_and_clear_errors
  net: sun: use pci_status_get_and_clear_errors
  net: skfp: use new constant PCI_STATUS_ERROR_BITS
  PCI: pci-bridge-emul: Use new constant PCI_STATUS_ERROR_BITS
  sound: bt87x: use pci_status_get_and_clear_errors

 drivers/net/ethernet/marvell/skge.h       |  6 -----
 drivers/net/ethernet/marvell/sky2.h       |  6 -----
 drivers/net/ethernet/realtek/r8169_main.c | 15 +++++-------
 drivers/net/ethernet/sun/cassini.c        | 28 ++++++++-------------
 drivers/net/ethernet/sun/sungem.c         | 30 +++++++----------------
 drivers/net/fddi/skfp/drvfbi.c            |  4 +--
 drivers/net/fddi/skfp/h/skfbi.h           |  5 ----
 drivers/pci/pci-bridge-emul.c             | 14 ++---------
 drivers/pci/pci.c                         | 23 +++++++++++++++++
 include/linux/pci.h                       |  8 ++++++
 sound/pci/bt87x.c                         |  7 +-----
 11 files changed, 61 insertions(+), 85 deletions(-)

-- 
2.25.1

[PATCH v4 01/10] net: marvell: add PCI_STATUS_SIG_TARGET_ABORT to PCI status error bits

[Heiner Kallweit]

In preparation of factoring out PCI_STATUS error bit handling let drivers
use the same collection of error bits. To facilitate bisecting we do this
in a separate patch per affected driver. For the Marvell drivers we have
to add PCI_STATUS_SIG_TARGET_ABORT to the error bits.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/ethernet/marvell/skge.h | 1 +
 drivers/net/ethernet/marvell/sky2.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/marvell/skge.h b/drivers/net/ethernet/marvell/skge.h
index 6fa7b6a34..e76c03c87 100644
--- a/drivers/net/ethernet/marvell/skge.h
+++ b/drivers/net/ethernet/marvell/skge.h
@@ -19,6 +19,7 @@
 			       PCI_STATUS_SIG_SYSTEM_ERROR | \
 			       PCI_STATUS_REC_MASTER_ABORT | \
 			       PCI_STATUS_REC_TARGET_ABORT | \
+			       PCI_STATUS_SIG_TARGET_ABORT | \
 			       PCI_STATUS_PARITY)
 
 enum csr_regs {
diff --git a/drivers/net/ethernet/marvell/sky2.h b/drivers/net/ethernet/marvell/sky2.h
index b02b65230..aee87f838 100644
--- a/drivers/net/ethernet/marvell/sky2.h
+++ b/drivers/net/ethernet/marvell/sky2.h
@@ -256,6 +256,7 @@ enum {
 			       PCI_STATUS_SIG_SYSTEM_ERROR | \
 			       PCI_STATUS_REC_MASTER_ABORT | \
 			       PCI_STATUS_REC_TARGET_ABORT | \
+			       PCI_STATUS_SIG_TARGET_ABORT | \
 			       PCI_STATUS_PARITY)
 
 enum csr_regs {
-- 
2.25.1

[PATCH v4 02/10] net: skfp: add PCI_STATUS_REC_TARGET_ABORT to PCI status error bits

[Heiner Kallweit]

In preparation of factoring out PCI_STATUS error bit handling let drivers
use the same collection of error bits. To facilitate bisecting we do this
in a separate patch per affected driver. For the skfp driver we have to
add PCI_STATUS_REC_TARGET_ABORT to the error bits.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/fddi/skfp/h/skfbi.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/fddi/skfp/h/skfbi.h b/drivers/net/fddi/skfp/h/skfbi.h
index 480795681..36e20a514 100644
--- a/drivers/net/fddi/skfp/h/skfbi.h
+++ b/drivers/net/fddi/skfp/h/skfbi.h
@@ -34,7 +34,7 @@
 #define I2C_ADDR_VPD	0xA0	/* I2C address for the VPD EEPROM */ 
 
 
-#define PCI_ERRBITS	(PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_SIG_TARGET_ABORT | PCI_STATUS_PARITY)
+#define PCI_ERRBITS	(PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT | PCI_STATUS_SIG_TARGET_ABORT | PCI_STATUS_PARITY)
 
 
 
-- 
2.25.1

[PATCH v4 03/10] r8169: add PCI_STATUS_PARITY to PCI status error bits

[Heiner Kallweit]

In preparation of factoring out PCI_STATUS error bit handling let drivers
use the same collection of error bits. To facilitate bisecting we do this
in a separate patch per affected driver. For the r8169 driver we have to
add PCI_STATUS_PARITY to the error bits.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index f081007a2..7c9892a16 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4381,7 +4381,7 @@ static void rtl8169_pcierr_interrupt(struct net_device *dev)
 	pci_write_config_word(pdev, PCI_COMMAND, pci_cmd);
 
 	pci_write_config_word(pdev, PCI_STATUS,
-		pci_status & (PCI_STATUS_DETECTED_PARITY |
+		pci_status & (PCI_STATUS_DETECTED_PARITY | PCI_STATUS_PARITY |
 		PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_REC_MASTER_ABORT |
 		PCI_STATUS_REC_TARGET_ABORT | PCI_STATUS_SIG_TARGET_ABORT));
 
-- 
2.25.1

[PATCH v4 04/10] PCI: Add constant PCI_STATUS_ERROR_BITS

[Heiner Kallweit]

This collection of PCI error bits is used in more than one driver,
so move it to the PCI core.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
v4:
- move new constant to include/linux/pci.h
- improve commit description
---
 drivers/net/ethernet/marvell/skge.h | 7 -------
 drivers/net/ethernet/marvell/sky2.h | 7 -------
 include/linux/pci.h                 | 7 +++++++
 3 files changed, 7 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/marvell/skge.h b/drivers/net/ethernet/marvell/skge.h
index e76c03c87..e149bdfe1 100644
--- a/drivers/net/ethernet/marvell/skge.h
+++ b/drivers/net/ethernet/marvell/skge.h
@@ -15,13 +15,6 @@
 #define  PCI_VPD_ROM_SZ	7L<<14	/* VPD ROM size 0=256, 1=512, ... */
 #define  PCI_REV_DESC	1<<2	/* Reverse Descriptor bytes */
 
-#define PCI_STATUS_ERROR_BITS (PCI_STATUS_DETECTED_PARITY | \
-			       PCI_STATUS_SIG_SYSTEM_ERROR | \
-			       PCI_STATUS_REC_MASTER_ABORT | \
-			       PCI_STATUS_REC_TARGET_ABORT | \
-			       PCI_STATUS_SIG_TARGET_ABORT | \
-			       PCI_STATUS_PARITY)
-
 enum csr_regs {
 	B0_RAP	= 0x0000,
 	B0_CTST	= 0x0004,
diff --git a/drivers/net/ethernet/marvell/sky2.h b/drivers/net/ethernet/marvell/sky2.h
index aee87f838..851d8ed34 100644
--- a/drivers/net/ethernet/marvell/sky2.h
+++ b/drivers/net/ethernet/marvell/sky2.h
@@ -252,13 +252,6 @@ enum {
 };
 
 
-#define PCI_STATUS_ERROR_BITS (PCI_STATUS_DETECTED_PARITY | \
-			       PCI_STATUS_SIG_SYSTEM_ERROR | \
-			       PCI_STATUS_REC_MASTER_ABORT | \
-			       PCI_STATUS_REC_TARGET_ABORT | \
-			       PCI_STATUS_SIG_TARGET_ABORT | \
-			       PCI_STATUS_PARITY)
-
 enum csr_regs {
 	B0_RAP		= 0x0000,
 	B0_CTST		= 0x0004,
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 3840a541a..101d71e0a 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -42,6 +42,13 @@
 
 #include <linux/pci_ids.h>
 
+#define PCI_STATUS_ERROR_BITS (PCI_STATUS_DETECTED_PARITY  | \
+			       PCI_STATUS_SIG_SYSTEM_ERROR | \
+			       PCI_STATUS_REC_MASTER_ABORT | \
+			       PCI_STATUS_REC_TARGET_ABORT | \
+			       PCI_STATUS_SIG_TARGET_ABORT | \
+			       PCI_STATUS_PARITY)
+
 /*
  * The PCI interface treats multi-function devices as independent
  * devices.  The slot/function address of each device is encoded
-- 
2.25.1

[PATCH v4 05/10] PCI: Add pci_status_get_and_clear_errors

[Heiner Kallweit]

Several drivers use the following code sequence:
1. Read PCI_STATUS
2. Mask out non-error bits
3. Action based on error bits set
4. Write back set error bits to clear them

As this is a repeated pattern, add a helper to the PCI core.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
v4:
- improve commit description
---
 drivers/pci/pci.c   | 23 +++++++++++++++++++++++
 include/linux/pci.h |  1 +
 2 files changed, 24 insertions(+)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index d828ca835..c16b0ba2a 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -173,6 +173,29 @@ unsigned char pci_bus_max_busnr(struct pci_bus *bus)
 }
 EXPORT_SYMBOL_GPL(pci_bus_max_busnr);
 
+/**
+ * pci_status_get_and_clear_errors - return and clear error bits in PCI_STATUS
+ * @pdev: the PCI device
+ *
+ * Returns error bits set in PCI_STATUS and clears them.
+ */
+int pci_status_get_and_clear_errors(struct pci_dev *pdev)
+{
+	u16 status;
+	int ret;
+
+	ret = pci_read_config_word(pdev, PCI_STATUS, &status);
+	if (ret != PCIBIOS_SUCCESSFUL)
+		return -EIO;
+
+	status &= PCI_STATUS_ERROR_BITS;
+	if (status)
+		pci_write_config_word(pdev, PCI_STATUS, status);
+
+	return status;
+}
+EXPORT_SYMBOL_GPL(pci_status_get_and_clear_errors);
+
 #ifdef CONFIG_HAS_IOMEM
 void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
 {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 101d71e0a..7beaf51e9 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1210,6 +1210,7 @@ int pci_select_bars(struct pci_dev *dev, unsigned long flags);
 bool pci_device_is_present(struct pci_dev *pdev);
 void pci_ignore_hotplug(struct pci_dev *dev);
 struct pci_dev *pci_real_dma_dev(struct pci_dev *dev);
+int pci_status_get_and_clear_errors(struct pci_dev *pdev);
 
 int __printf(6, 7) pci_request_irq(struct pci_dev *dev, unsigned int nr,
 		irq_handler_t handler, irq_handler_t thread_fn, void *dev_id,
-- 
2.25.1

[PATCH v4 06/10] r8169: use pci_status_get_and_clear_errors

[Heiner Kallweit]

Use new helper pci_status_get_and_clear_errors() to simplify the code.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 7c9892a16..4495a3cf9 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4357,13 +4357,15 @@ static void rtl8169_pcierr_interrupt(struct net_device *dev)
 {
 	struct rtl8169_private *tp = netdev_priv(dev);
 	struct pci_dev *pdev = tp->pci_dev;
-	u16 pci_status, pci_cmd;
+	int pci_status_errs;
+	u16 pci_cmd;
 
 	pci_read_config_word(pdev, PCI_COMMAND, &pci_cmd);
-	pci_read_config_word(pdev, PCI_STATUS, &pci_status);
 
-	netif_err(tp, intr, dev, "PCI error (cmd = 0x%04x, status = 0x%04x)\n",
-		  pci_cmd, pci_status);
+	pci_status_errs = pci_status_get_and_clear_errors(pdev);
+
+	netif_err(tp, intr, dev, "PCI error (cmd = 0x%04x, status_errs = 0x%04x)\n",
+		  pci_cmd, pci_status_errs);
 
 	/*
 	 * The recovery sequence below admits a very elaborated explanation:
@@ -4380,11 +4382,6 @@ static void rtl8169_pcierr_interrupt(struct net_device *dev)
 
 	pci_write_config_word(pdev, PCI_COMMAND, pci_cmd);
 
-	pci_write_config_word(pdev, PCI_STATUS,
-		pci_status & (PCI_STATUS_DETECTED_PARITY | PCI_STATUS_PARITY |
-		PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_REC_MASTER_ABORT |
-		PCI_STATUS_REC_TARGET_ABORT | PCI_STATUS_SIG_TARGET_ABORT));
-
 	rtl_schedule_task(tp, RTL_FLAG_TASK_RESET_PENDING);
 }
 
-- 
2.25.1

[PATCH v4 07/10] net: sun: use pci_status_get_and_clear_errors

[Heiner Kallweit]

Use new helper pci_status_get_and_clear_errors() to simplify the code.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/ethernet/sun/cassini.c | 28 ++++++++++------------------
 drivers/net/ethernet/sun/sungem.c  | 30 +++++++++---------------------
 2 files changed, 19 insertions(+), 39 deletions(-)

diff --git a/drivers/net/ethernet/sun/cassini.c b/drivers/net/ethernet/sun/cassini.c
index 6ec9163e2..e6d1aa882 100644
--- a/drivers/net/ethernet/sun/cassini.c
+++ b/drivers/net/ethernet/sun/cassini.c
@@ -1716,34 +1716,26 @@ static int cas_pci_interrupt(struct net_device *dev, struct cas *cp,
 	pr_cont("\n");
 
 	if (stat & PCI_ERR_OTHER) {
-		u16 cfg;
+		int pci_errs;
 
 		/* Interrogate PCI config space for the
 		 * true cause.
 		 */
-		pci_read_config_word(cp->pdev, PCI_STATUS, &cfg);
-		netdev_err(dev, "Read PCI cfg space status [%04x]\n", cfg);
-		if (cfg & PCI_STATUS_PARITY)
+		pci_errs = pci_status_get_and_clear_errors(cp->pdev);
+
+		netdev_err(dev, "PCI status errors[%04x]\n", pci_errs);
+		if (pci_errs & PCI_STATUS_PARITY)
 			netdev_err(dev, "PCI parity error detected\n");
-		if (cfg & PCI_STATUS_SIG_TARGET_ABORT)
+		if (pci_errs & PCI_STATUS_SIG_TARGET_ABORT)
 			netdev_err(dev, "PCI target abort\n");
-		if (cfg & PCI_STATUS_REC_TARGET_ABORT)
+		if (pci_errs & PCI_STATUS_REC_TARGET_ABORT)
 			netdev_err(dev, "PCI master acks target abort\n");
-		if (cfg & PCI_STATUS_REC_MASTER_ABORT)
+		if (pci_errs & PCI_STATUS_REC_MASTER_ABORT)
 			netdev_err(dev, "PCI master abort\n");
-		if (cfg & PCI_STATUS_SIG_SYSTEM_ERROR)
+		if (pci_errs & PCI_STATUS_SIG_SYSTEM_ERROR)
 			netdev_err(dev, "PCI system error SERR#\n");
-		if (cfg & PCI_STATUS_DETECTED_PARITY)
+		if (pci_errs & PCI_STATUS_DETECTED_PARITY)
 			netdev_err(dev, "PCI parity error\n");
-
-		/* Write the error bits back to clear them. */
-		cfg &= (PCI_STATUS_PARITY |
-			PCI_STATUS_SIG_TARGET_ABORT |
-			PCI_STATUS_REC_TARGET_ABORT |
-			PCI_STATUS_REC_MASTER_ABORT |
-			PCI_STATUS_SIG_SYSTEM_ERROR |
-			PCI_STATUS_DETECTED_PARITY);
-		pci_write_config_word(cp->pdev, PCI_STATUS, cfg);
 	}
 
 	/* For all PCI errors, we should reset the chip. */
diff --git a/drivers/net/ethernet/sun/sungem.c b/drivers/net/ethernet/sun/sungem.c
index 8358064fb..2d392a7b1 100644
--- a/drivers/net/ethernet/sun/sungem.c
+++ b/drivers/net/ethernet/sun/sungem.c
@@ -545,37 +545,25 @@ static int gem_pci_interrupt(struct net_device *dev, struct gem *gp, u32 gem_sta
 	}
 
 	if (pci_estat & GREG_PCIESTAT_OTHER) {
-		u16 pci_cfg_stat;
+		int pci_errs;
 
 		/* Interrogate PCI config space for the
 		 * true cause.
 		 */
-		pci_read_config_word(gp->pdev, PCI_STATUS,
-				     &pci_cfg_stat);
-		netdev_err(dev, "Read PCI cfg space status [%04x]\n",
-			   pci_cfg_stat);
-		if (pci_cfg_stat & PCI_STATUS_PARITY)
+		pci_errs = pci_status_get_and_clear_errors(gp->pdev);
+		netdev_err(dev, "PCI status errors[%04x]\n", pci_errs);
+		if (pci_errs & PCI_STATUS_PARITY)
 			netdev_err(dev, "PCI parity error detected\n");
-		if (pci_cfg_stat & PCI_STATUS_SIG_TARGET_ABORT)
+		if (pci_errs & PCI_STATUS_SIG_TARGET_ABORT)
 			netdev_err(dev, "PCI target abort\n");
-		if (pci_cfg_stat & PCI_STATUS_REC_TARGET_ABORT)
+		if (pci_errs & PCI_STATUS_REC_TARGET_ABORT)
 			netdev_err(dev, "PCI master acks target abort\n");
-		if (pci_cfg_stat & PCI_STATUS_REC_MASTER_ABORT)
+		if (pci_errs & PCI_STATUS_REC_MASTER_ABORT)
 			netdev_err(dev, "PCI master abort\n");
-		if (pci_cfg_stat & PCI_STATUS_SIG_SYSTEM_ERROR)
+		if (pci_errs & PCI_STATUS_SIG_SYSTEM_ERROR)
 			netdev_err(dev, "PCI system error SERR#\n");
-		if (pci_cfg_stat & PCI_STATUS_DETECTED_PARITY)
+		if (pci_errs & PCI_STATUS_DETECTED_PARITY)
 			netdev_err(dev, "PCI parity error\n");
-
-		/* Write the error bits back to clear them. */
-		pci_cfg_stat &= (PCI_STATUS_PARITY |
-				 PCI_STATUS_SIG_TARGET_ABORT |
-				 PCI_STATUS_REC_TARGET_ABORT |
-				 PCI_STATUS_REC_MASTER_ABORT |
-				 PCI_STATUS_SIG_SYSTEM_ERROR |
-				 PCI_STATUS_DETECTED_PARITY);
-		pci_write_config_word(gp->pdev,
-				      PCI_STATUS, pci_cfg_stat);
 	}
 
 	/* For all PCI errors, we should reset the chip. */
-- 
2.25.1

[PATCH v4 08/10] net: skfp: use new constant PCI_STATUS_ERROR_BITS

[Heiner Kallweit]

Use new PCI core constant PCI_STATUS_ERROR_BITS to simplify the code.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/fddi/skfp/drvfbi.c  | 4 ++--
 drivers/net/fddi/skfp/h/skfbi.h | 5 -----
 2 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/net/fddi/skfp/drvfbi.c b/drivers/net/fddi/skfp/drvfbi.c
index 9c8aa3a95..cc9ac5724 100644
--- a/drivers/net/fddi/skfp/drvfbi.c
+++ b/drivers/net/fddi/skfp/drvfbi.c
@@ -20,7 +20,7 @@
 #include "h/supern_2.h"
 #include "h/skfbiinc.h"
 #include <linux/bitrev.h>
-#include <linux/pci_regs.h>
+#include <linux/pci.h>
 
 #ifndef	lint
 static const char ID_sccs[] = "@(#)drvfbi.c	1.63 99/02/11 (C) SK " ;
@@ -112,7 +112,7 @@ static void card_start(struct s_smc *smc)
 	 */
 	outp(ADDR(B0_TST_CTRL), TST_CFG_WRITE_ON) ;	/* enable for writes */
 	word = inpw(PCI_C(PCI_STATUS)) ;
-	outpw(PCI_C(PCI_STATUS), word | PCI_ERRBITS) ;
+	outpw(PCI_C(PCI_STATUS), word | PCI_STATUS_ERROR_BITS);
 	outp(ADDR(B0_TST_CTRL), TST_CFG_WRITE_OFF) ;	/* disable writes */
 
 	/*
diff --git a/drivers/net/fddi/skfp/h/skfbi.h b/drivers/net/fddi/skfp/h/skfbi.h
index 36e20a514..ccee00b71 100644
--- a/drivers/net/fddi/skfp/h/skfbi.h
+++ b/drivers/net/fddi/skfp/h/skfbi.h
@@ -33,11 +33,6 @@
  */
 #define I2C_ADDR_VPD	0xA0	/* I2C address for the VPD EEPROM */ 
 
-
-#define PCI_ERRBITS	(PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT | PCI_STATUS_SIG_TARGET_ABORT | PCI_STATUS_PARITY)
-
-
-
 /*
  *	Control Register File:
  *	Bank 0
-- 
2.25.1

[PATCH v4 09/10] PCI: pci-bridge-emul: Use new constant PCI_STATUS_ERROR_BITS

[Heiner Kallweit]

Use new constant PCI_STATUS_ERROR_BITS to simplify the code.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/pci/pci-bridge-emul.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/drivers/pci/pci-bridge-emul.c b/drivers/pci/pci-bridge-emul.c
index fffa77093..4f4f54bc7 100644
--- a/drivers/pci/pci-bridge-emul.c
+++ b/drivers/pci/pci-bridge-emul.c
@@ -50,12 +50,7 @@ static const struct pci_bridge_reg_behavior pci_regs_behavior[] = {
 		       (PCI_STATUS_CAP_LIST | PCI_STATUS_66MHZ |
 			PCI_STATUS_FAST_BACK | PCI_STATUS_DEVSEL_MASK) << 16),
 		.rsvd = GENMASK(15, 10) | ((BIT(6) | GENMASK(3, 0)) << 16),
-		.w1c = (PCI_STATUS_PARITY |
-			PCI_STATUS_SIG_TARGET_ABORT |
-			PCI_STATUS_REC_TARGET_ABORT |
-			PCI_STATUS_REC_MASTER_ABORT |
-			PCI_STATUS_SIG_SYSTEM_ERROR |
-			PCI_STATUS_DETECTED_PARITY) << 16,
+		.w1c = PCI_STATUS_ERROR_BITS << 16,
 	},
 	[PCI_CLASS_REVISION / 4] = { .ro = ~0 },
 
@@ -100,12 +95,7 @@ static const struct pci_bridge_reg_behavior pci_regs_behavior[] = {
 			 PCI_STATUS_DEVSEL_MASK) << 16) |
 		       GENMASK(11, 8) | GENMASK(3, 0)),
 
-		.w1c = (PCI_STATUS_PARITY |
-			PCI_STATUS_SIG_TARGET_ABORT |
-			PCI_STATUS_REC_TARGET_ABORT |
-			PCI_STATUS_REC_MASTER_ABORT |
-			PCI_STATUS_SIG_SYSTEM_ERROR |
-			PCI_STATUS_DETECTED_PARITY) << 16,
+		.w1c = PCI_STATUS_ERROR_BITS << 16,
 
 		.rsvd = ((BIT(6) | GENMASK(4, 0)) << 16),
 	},
-- 
2.25.1

[PATCH v4 10/10] sound: bt87x: use pci_status_get_and_clear_errors

[Heiner Kallweit]

Use new helper pci_status_get_and_clear_errors() to simplify the code.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 sound/pci/bt87x.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/sound/pci/bt87x.c b/sound/pci/bt87x.c
index 8c48864c8..656750466 100644
--- a/sound/pci/bt87x.c
+++ b/sound/pci/bt87x.c
@@ -271,13 +271,8 @@ static void snd_bt87x_free_risc(struct snd_bt87x *chip)
 
 static void snd_bt87x_pci_error(struct snd_bt87x *chip, unsigned int status)
 {
-	u16 pci_status;
+	int pci_status = pci_status_get_and_clear_errors(chip->pci);
 
-	pci_read_config_word(chip->pci, PCI_STATUS, &pci_status);
-	pci_status &= PCI_STATUS_PARITY | PCI_STATUS_SIG_TARGET_ABORT |
-		PCI_STATUS_REC_TARGET_ABORT | PCI_STATUS_REC_MASTER_ABORT |
-		PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_DETECTED_PARITY;
-	pci_write_config_word(chip->pci, PCI_STATUS, pci_status);
 	if (pci_status != PCI_STATUS_DETECTED_PARITY)
 		dev_err(chip->card->dev,
 			"Aieee - PCI error! status %#08x, PCI status %#04x\n",
-- 
2.25.1

Re: [PATCH v4 00/10] PCI: Add and use constant PCI_STATUS_ERROR_BITS and helper pci_status_get_and_clear_errors

[David Miller]

Bjorn, please review and let me know if it is OK to merge this via the
networking tree.

Thank you.

Re: [PATCH v4 04/10] PCI: Add constant PCI_STATUS_ERROR_BITS

[Bjorn Helgaas]

On Sat, Feb 29, 2020 at 11:23:44PM +0100, Heiner Kallweit wrote:
> This collection of PCI error bits is used in more than one driver,
> so move it to the PCI core.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

> ---
> v4:
> - move new constant to include/linux/pci.h
> - improve commit description
> ---
>  drivers/net/ethernet/marvell/skge.h | 7 -------
>  drivers/net/ethernet/marvell/sky2.h | 7 -------
>  include/linux/pci.h                 | 7 +++++++
>  3 files changed, 7 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/skge.h b/drivers/net/ethernet/marvell/skge.h
> index e76c03c87..e149bdfe1 100644
> --- a/drivers/net/ethernet/marvell/skge.h
> +++ b/drivers/net/ethernet/marvell/skge.h
> @@ -15,13 +15,6 @@
>  #define  PCI_VPD_ROM_SZ	7L<<14	/* VPD ROM size 0=256, 1=512, ... */
>  #define  PCI_REV_DESC	1<<2	/* Reverse Descriptor bytes */
>  
> -#define PCI_STATUS_ERROR_BITS (PCI_STATUS_DETECTED_PARITY | \
> -			       PCI_STATUS_SIG_SYSTEM_ERROR | \
> -			       PCI_STATUS_REC_MASTER_ABORT | \
> -			       PCI_STATUS_REC_TARGET_ABORT | \
> -			       PCI_STATUS_SIG_TARGET_ABORT | \
> -			       PCI_STATUS_PARITY)
> -
>  enum csr_regs {
>  	B0_RAP	= 0x0000,
>  	B0_CTST	= 0x0004,
> diff --git a/drivers/net/ethernet/marvell/sky2.h b/drivers/net/ethernet/marvell/sky2.h
> index aee87f838..851d8ed34 100644
> --- a/drivers/net/ethernet/marvell/sky2.h
> +++ b/drivers/net/ethernet/marvell/sky2.h
> @@ -252,13 +252,6 @@ enum {
>  };
>  
>  
> -#define PCI_STATUS_ERROR_BITS (PCI_STATUS_DETECTED_PARITY | \
> -			       PCI_STATUS_SIG_SYSTEM_ERROR | \
> -			       PCI_STATUS_REC_MASTER_ABORT | \
> -			       PCI_STATUS_REC_TARGET_ABORT | \
> -			       PCI_STATUS_SIG_TARGET_ABORT | \
> -			       PCI_STATUS_PARITY)
> -
>  enum csr_regs {
>  	B0_RAP		= 0x0000,
>  	B0_CTST		= 0x0004,
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 3840a541a..101d71e0a 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -42,6 +42,13 @@
>  
>  #include <linux/pci_ids.h>
>  
> +#define PCI_STATUS_ERROR_BITS (PCI_STATUS_DETECTED_PARITY  | \
> +			       PCI_STATUS_SIG_SYSTEM_ERROR | \
> +			       PCI_STATUS_REC_MASTER_ABORT | \
> +			       PCI_STATUS_REC_TARGET_ABORT | \
> +			       PCI_STATUS_SIG_TARGET_ABORT | \
> +			       PCI_STATUS_PARITY)
> +
>  /*
>   * The PCI interface treats multi-function devices as independent
>   * devices.  The slot/function address of each device is encoded
> -- 
> 2.25.1
> 
> 

Re: [PATCH v4 05/10] PCI: Add pci_status_get_and_clear_errors

[Bjorn Helgaas]

On Sat, Feb 29, 2020 at 11:24:23PM +0100, Heiner Kallweit wrote:
> Several drivers use the following code sequence:
> 1. Read PCI_STATUS
> 2. Mask out non-error bits
> 3. Action based on error bits set
> 4. Write back set error bits to clear them
> 
> As this is a repeated pattern, add a helper to the PCI core.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

Nit: if you have any reason to revise this, I would prefer
"pci_status_get_and_clear_errors()" (with parens) in the subject.

> ---
> v4:
> - improve commit description
> ---
>  drivers/pci/pci.c   | 23 +++++++++++++++++++++++
>  include/linux/pci.h |  1 +
>  2 files changed, 24 insertions(+)
> 
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index d828ca835..c16b0ba2a 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -173,6 +173,29 @@ unsigned char pci_bus_max_busnr(struct pci_bus *bus)
>  }
>  EXPORT_SYMBOL_GPL(pci_bus_max_busnr);
>  
> +/**
> + * pci_status_get_and_clear_errors - return and clear error bits in PCI_STATUS
> + * @pdev: the PCI device
> + *
> + * Returns error bits set in PCI_STATUS and clears them.
> + */
> +int pci_status_get_and_clear_errors(struct pci_dev *pdev)
> +{
> +	u16 status;
> +	int ret;
> +
> +	ret = pci_read_config_word(pdev, PCI_STATUS, &status);
> +	if (ret != PCIBIOS_SUCCESSFUL)
> +		return -EIO;
> +
> +	status &= PCI_STATUS_ERROR_BITS;
> +	if (status)
> +		pci_write_config_word(pdev, PCI_STATUS, status);
> +
> +	return status;
> +}
> +EXPORT_SYMBOL_GPL(pci_status_get_and_clear_errors);
> +
>  #ifdef CONFIG_HAS_IOMEM
>  void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
>  {
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 101d71e0a..7beaf51e9 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1210,6 +1210,7 @@ int pci_select_bars(struct pci_dev *dev, unsigned long flags);
>  bool pci_device_is_present(struct pci_dev *pdev);
>  void pci_ignore_hotplug(struct pci_dev *dev);
>  struct pci_dev *pci_real_dma_dev(struct pci_dev *dev);
> +int pci_status_get_and_clear_errors(struct pci_dev *pdev);
>  
>  int __printf(6, 7) pci_request_irq(struct pci_dev *dev, unsigned int nr,
>  		irq_handler_t handler, irq_handler_t thread_fn, void *dev_id,
> -- 
> 2.25.1
> 
> 

Re: [PATCH v4 09/10] PCI: pci-bridge-emul: Use new constant PCI_STATUS_ERROR_BITS

[Bjorn Helgaas]

On Sat, Feb 29, 2020 at 11:28:18PM +0100, Heiner Kallweit wrote:
> Use new constant PCI_STATUS_ERROR_BITS to simplify the code.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

> ---
>  drivers/pci/pci-bridge-emul.c | 14 ++------------
>  1 file changed, 2 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/pci/pci-bridge-emul.c b/drivers/pci/pci-bridge-emul.c
> index fffa77093..4f4f54bc7 100644
> --- a/drivers/pci/pci-bridge-emul.c
> +++ b/drivers/pci/pci-bridge-emul.c
> @@ -50,12 +50,7 @@ static const struct pci_bridge_reg_behavior pci_regs_behavior[] = {
>  		       (PCI_STATUS_CAP_LIST | PCI_STATUS_66MHZ |
>  			PCI_STATUS_FAST_BACK | PCI_STATUS_DEVSEL_MASK) << 16),
>  		.rsvd = GENMASK(15, 10) | ((BIT(6) | GENMASK(3, 0)) << 16),
> -		.w1c = (PCI_STATUS_PARITY |
> -			PCI_STATUS_SIG_TARGET_ABORT |
> -			PCI_STATUS_REC_TARGET_ABORT |
> -			PCI_STATUS_REC_MASTER_ABORT |
> -			PCI_STATUS_SIG_SYSTEM_ERROR |
> -			PCI_STATUS_DETECTED_PARITY) << 16,
> +		.w1c = PCI_STATUS_ERROR_BITS << 16,
>  	},
>  	[PCI_CLASS_REVISION / 4] = { .ro = ~0 },
>  
> @@ -100,12 +95,7 @@ static const struct pci_bridge_reg_behavior pci_regs_behavior[] = {
>  			 PCI_STATUS_DEVSEL_MASK) << 16) |
>  		       GENMASK(11, 8) | GENMASK(3, 0)),
>  
> -		.w1c = (PCI_STATUS_PARITY |
> -			PCI_STATUS_SIG_TARGET_ABORT |
> -			PCI_STATUS_REC_TARGET_ABORT |
> -			PCI_STATUS_REC_MASTER_ABORT |
> -			PCI_STATUS_SIG_SYSTEM_ERROR |
> -			PCI_STATUS_DETECTED_PARITY) << 16,
> +		.w1c = PCI_STATUS_ERROR_BITS << 16,
>  
>  		.rsvd = ((BIT(6) | GENMASK(4, 0)) << 16),
>  	},
> -- 
> 2.25.1
> 
> 

Re: [PATCH v4 00/10] PCI: Add and use constant PCI_STATUS_ERROR_BITS and helper pci_status_get_and_clear_errors

[Bjorn Helgaas]

On Tue, Mar 03, 2020 at 06:59:37PM -0800, David Miller wrote:
> 
> Bjorn, please review and let me know if it is OK to merge this via the
> networking tree.

I acked the relevant patches and you're welcome to merge it via
networking.  Thanks!

Re: [PATCH v4 00/10] PCI: Add and use constant PCI_STATUS_ERROR_BITS and helper pci_status_get_and_clear_errors

[David Miller]

From: Bjorn Helgaas <helgaas@kernel.org>
Date: Wed, 4 Mar 2020 10:59:04 -0600

> On Tue, Mar 03, 2020 at 06:59:37PM -0800, David Miller wrote:
>> 
>> Bjorn, please review and let me know if it is OK to merge this via the
>> networking tree.
> 
> I acked the relevant patches and you're welcome to merge it via
> networking.  Thanks!

Ok, thanks.

Series applied to net-next.

Thanks again everyone.

Re: [PATCH v4 10/10] sound: bt87x: use pci_status_get_and_clear_errors

[Takashi Iwai]

On Sat, 29 Feb 2020 23:29:07 +0100,
Heiner Kallweit wrote:
> 
> Use new helper pci_status_get_and_clear_errors() to simplify the code.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

Acked-by: Takashi Iwai <tiwai@suse.de>


thanks,

Takashi

> ---
>  sound/pci/bt87x.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/sound/pci/bt87x.c b/sound/pci/bt87x.c
> index 8c48864c8..656750466 100644
> --- a/sound/pci/bt87x.c
> +++ b/sound/pci/bt87x.c
> @@ -271,13 +271,8 @@ static void snd_bt87x_free_risc(struct snd_bt87x *chip)
>  
>  static void snd_bt87x_pci_error(struct snd_bt87x *chip, unsigned int status)
>  {
> -	u16 pci_status;
> +	int pci_status = pci_status_get_and_clear_errors(chip->pci);
>  
> -	pci_read_config_word(chip->pci, PCI_STATUS, &pci_status);
> -	pci_status &= PCI_STATUS_PARITY | PCI_STATUS_SIG_TARGET_ABORT |
> -		PCI_STATUS_REC_TARGET_ABORT | PCI_STATUS_REC_MASTER_ABORT |
> -		PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_DETECTED_PARITY;
> -	pci_write_config_word(chip->pci, PCI_STATUS, pci_status);
>  	if (pci_status != PCI_STATUS_DETECTED_PARITY)
>  		dev_err(chip->card->dev,
>  			"Aieee - PCI error! status %#08x, PCI status %#04x\n",
> -- 
> 2.25.1
> 
>