[PATCH v12 1/7] ACPI: Move PCI reset to a separate function

[PATCH v12 1/7] ACPI: Move PCI reset to a separate function

[Sinan Kaya]

Getting ready to factor out PCI specific code when CONFIG_PCI is unset.
Create a acpi_pci_reset() that kick starts PCI specific reset.

Signed-off-by: Sinan Kaya <okaya@kernel.org>
---
 drivers/acpi/reboot.c | 32 +++++++++++++++++++-------------
 1 file changed, 19 insertions(+), 13 deletions(-)

diff --git a/drivers/acpi/reboot.c b/drivers/acpi/reboot.c
index 6fa9c2a4cfe9..d642a9dede52 100644
--- a/drivers/acpi/reboot.c
+++ b/drivers/acpi/reboot.c
@@ -4,11 +4,27 @@
 #include <linux/acpi.h>
 #include <acpi/reboot.h>
 
+static void acpi_pci_reboot(struct acpi_generic_address *rr, u8 reset_value)
+{
+	unsigned int devfn;
+	struct pci_bus *bus0;
+
+	/* The reset register can only live on bus 0. */
+	bus0 = pci_find_bus(0, 0);
+	if (!bus0)
+		return;
+	/* Form PCI device/function pair. */
+	devfn = PCI_DEVFN((rr->address >> 32) & 0xffff,
+			  (rr->address >> 16) & 0xffff);
+	pr_debug("Resetting with ACPI PCI RESET_REG.\n");
+	/* Write the value that resets us. */
+	pci_bus_write_config_byte(bus0, devfn,
+			(rr->address & 0xffff), reset_value);
+}
+
 void acpi_reboot(void)
 {
 	struct acpi_generic_address *rr;
-	struct pci_bus *bus0;
-	unsigned int devfn;
 	u8 reset_value;
 
 	if (acpi_disabled)
@@ -33,17 +49,7 @@ void acpi_reboot(void)
 	 * on a device on bus 0. */
 	switch (rr->space_id) {
 	case ACPI_ADR_SPACE_PCI_CONFIG:
-		/* The reset register can only live on bus 0. */
-		bus0 = pci_find_bus(0, 0);
-		if (!bus0)
-			return;
-		/* Form PCI device/function pair. */
-		devfn = PCI_DEVFN((rr->address >> 32) & 0xffff,
-				  (rr->address >> 16) & 0xffff);
-		printk(KERN_DEBUG "Resetting with ACPI PCI RESET_REG.\n");
-		/* Write the value that resets us. */
-		pci_bus_write_config_byte(bus0, devfn,
-				(rr->address & 0xffff), reset_value);
+		acpi_pci_reboot(rr, reset_value);
 		break;
 
 	case ACPI_ADR_SPACE_SYSTEM_MEMORY:
-- 
2.19.0

[PATCH v12 2/7] ACPI: Allow CONFIG_PCI to be unset for reboot

[Sinan Kaya]

Make PCI reboot conditional on CONFIG_PCI set on the kernel configuration.

Signed-off-by: Sinan Kaya <okaya@kernel.org>
---
 drivers/acpi/reboot.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/acpi/reboot.c b/drivers/acpi/reboot.c
index d642a9dede52..ca707f5b521d 100644
--- a/drivers/acpi/reboot.c
+++ b/drivers/acpi/reboot.c
@@ -4,6 +4,7 @@
 #include <linux/acpi.h>
 #include <acpi/reboot.h>
 
+#ifdef CONFIG_PCI
 static void acpi_pci_reboot(struct acpi_generic_address *rr, u8 reset_value)
 {
 	unsigned int devfn;
@@ -21,6 +22,13 @@ static void acpi_pci_reboot(struct acpi_generic_address *rr, u8 reset_value)
 	pci_bus_write_config_byte(bus0, devfn,
 			(rr->address & 0xffff), reset_value);
 }
+#else
+static inline void acpi_pci_reboot(struct acpi_generic_address *rr,
+				   u8 reset_value)
+{
+	pr_warn_once("PCI configuration space access is not supported\n");
+}
+#endif
 
 void acpi_reboot(void)
 {
-- 
2.19.0

[PATCH v12 3/7] ACPICA: Remove PCI bits from ACPICA when CONFIG_PCI is unset

[Sinan Kaya]

Allow ACPI to be built without PCI support in place.

Signed-off-by: Sinan Kaya <okaya@kernel.org>
---
 drivers/acpi/acpica/Makefile    | 2 +-
 drivers/acpi/acpica/achware.h   | 9 +++++++++
 drivers/acpi/acpica/evhandler.c | 8 ++++----
 drivers/acpi/acpica/exregion.c  | 4 ++++
 drivers/acpi/osl.c              | 2 ++
 include/acpi/platform/aclinux.h | 4 ++++
 6 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/acpica/Makefile b/drivers/acpi/acpica/Makefile
index b14621da5413..59700433a96e 100644
--- a/drivers/acpi/acpica/Makefile
+++ b/drivers/acpi/acpica/Makefile
@@ -77,13 +77,13 @@ acpi-y +=		\
 	hwacpi.o	\
 	hwesleep.o	\
 	hwgpe.o		\
-	hwpci.o		\
 	hwregs.o	\
 	hwsleep.o	\
 	hwvalid.o	\
 	hwxface.o	\
 	hwxfsleep.o
 
+acpi-$(CONFIG_PCI) += hwpci.o
 acpi-$(ACPI_FUTURE_USAGE) += hwtimer.o
 
 acpi-y +=		\
diff --git a/drivers/acpi/acpica/achware.h b/drivers/acpi/acpica/achware.h
index 43ce67a9da1f..ef99e2fc37f8 100644
--- a/drivers/acpi/acpica/achware.h
+++ b/drivers/acpi/acpica/achware.h
@@ -106,11 +106,20 @@ acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 				 struct acpi_gpe_block_info *gpe_block,
 				 void *context);
 
+#ifdef ACPI_PCI_CONFIGURED
 /*
  * hwpci - PCI configuration support
  */
 acpi_status
 acpi_hw_derive_pci_id(struct acpi_pci_id *pci_id,
 		      acpi_handle root_pci_device, acpi_handle pci_region);
+#else
+static inline acpi_status
+acpi_hw_derive_pci_id(struct acpi_pci_id *pci_id, acpi_handle root_pci_device,
+		      acpi_handle pci_region)
+{
+	return AE_SUPPORT;
+}
+#endif
 
 #endif				/* __ACHWARE_H__ */
diff --git a/drivers/acpi/acpica/evhandler.c b/drivers/acpi/acpica/evhandler.c
index d319ee33d040..4ed1e67db6be 100644
--- a/drivers/acpi/acpica/evhandler.c
+++ b/drivers/acpi/acpica/evhandler.c
@@ -364,25 +364,25 @@ acpi_ev_install_space_handler(struct acpi_namespace_node *node,
 			handler = acpi_ex_system_io_space_handler;
 			setup = acpi_ev_io_space_region_setup;
 			break;
-
+#ifdef ACPI_PCI_CONFIGURED
 		case ACPI_ADR_SPACE_PCI_CONFIG:
 
 			handler = acpi_ex_pci_config_space_handler;
 			setup = acpi_ev_pci_config_region_setup;
 			break;
-
+#endif
 		case ACPI_ADR_SPACE_CMOS:
 
 			handler = acpi_ex_cmos_space_handler;
 			setup = acpi_ev_cmos_region_setup;
 			break;
-
+#ifdef ACPI_PCI_CONFIGURED
 		case ACPI_ADR_SPACE_PCI_BAR_TARGET:
 
 			handler = acpi_ex_pci_bar_space_handler;
 			setup = acpi_ev_pci_bar_region_setup;
 			break;
-
+#endif
 		case ACPI_ADR_SPACE_DATA_TABLE:
 
 			handler = acpi_ex_data_table_space_handler;
diff --git a/drivers/acpi/acpica/exregion.c b/drivers/acpi/acpica/exregion.c
index 97bbfd07fcf7..2c58f5e00b1a 100644
--- a/drivers/acpi/acpica/exregion.c
+++ b/drivers/acpi/acpica/exregion.c
@@ -311,6 +311,7 @@ acpi_ex_system_io_space_handler(u32 function,
 	return_ACPI_STATUS(status);
 }
 
+#ifdef ACPI_PCI_CONFIGURED
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ex_pci_config_space_handler
@@ -387,6 +388,7 @@ acpi_ex_pci_config_space_handler(u32 function,
 
 	return_ACPI_STATUS(status);
 }
+#endif
 
 /*******************************************************************************
  *
@@ -420,6 +422,7 @@ acpi_ex_cmos_space_handler(u32 function,
 	return_ACPI_STATUS(status);
 }
 
+#ifdef ACPI_PCI_CONFIGURED
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ex_pci_bar_space_handler
@@ -451,6 +454,7 @@ acpi_ex_pci_bar_space_handler(u32 function,
 
 	return_ACPI_STATUS(status);
 }
+#endif
 
 /*******************************************************************************
  *
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index b48874b8e1ea..f29e427d0d1d 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -769,6 +769,7 @@ acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
 	return AE_OK;
 }
 
+#ifdef CONFIG_PCI
 acpi_status
 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 			       u64 *value, u32 width)
@@ -827,6 +828,7 @@ acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 
 	return (result ? AE_ERROR : AE_OK);
 }
+#endif
 
 static void acpi_os_execute_deferred(struct work_struct *work)
 {
diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
index 7451b3bca83a..e3d21d014fcc 100644
--- a/include/acpi/platform/aclinux.h
+++ b/include/acpi/platform/aclinux.h
@@ -33,6 +33,10 @@
 
 /* Kernel specific ACPICA configuration */
 
+#ifdef CONFIG_PCI
+#define ACPI_PCI_CONFIGURED
+#endif
+
 #ifdef CONFIG_ACPI_REDUCED_HARDWARE_ONLY
 #define ACPI_REDUCED_HARDWARE 1
 #endif
-- 
2.19.0

[PATCH v12 4/7] PCI/ACPI: Allow ACPI to be built without CONFIG_PCI set

[Sinan Kaya]

We are compiling PCI code today for systems with ACPI and no PCI
device present. Remove the useless code and reduce the tight
dependency.

Signed-off-by: Sinan Kaya <okaya@kernel.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com> # PCI parts
Acked-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/include/asm/pci_x86.h | 7 +++++++
 drivers/acpi/Kconfig           | 1 -
 drivers/acpi/Makefile          | 2 +-
 drivers/acpi/internal.h        | 5 +++++
 drivers/pci/Makefile           | 2 +-
 include/acpi/acpi_drivers.h    | 7 +++++++
 include/linux/acpi.h           | 7 +++++++
 include/linux/pci.h            | 4 ++++
 8 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index 959d618dbb17..73bb404f4d2a 100644
--- a/arch/x86/include/asm/pci_x86.h
+++ b/arch/x86/include/asm/pci_x86.h
@@ -121,7 +121,14 @@ extern void __init dmi_check_pciprobe(void);
 extern void __init dmi_check_skip_isa_align(void);
 
 /* some common used subsys_initcalls */
+#ifdef CONFIG_PCI
 extern int __init pci_acpi_init(void);
+#else
+static inline int  __init pci_acpi_init(void)
+{
+	return -EINVAL;
+}
+#endif
 extern void __init pcibios_irq_init(void);
 extern int __init pcibios_init(void);
 extern int pci_legacy_init(void);
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 7cea769c37df..a0abcb3bd673 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -9,7 +9,6 @@ config ARCH_SUPPORTS_ACPI
 menuconfig ACPI
 	bool "ACPI (Advanced Configuration and Power Interface) Support"
 	depends on ARCH_SUPPORTS_ACPI
-	depends on PCI
 	select PNP
 	default y if X86
 	help
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index edc039313cd6..7c6afc111d76 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -39,7 +39,7 @@ acpi-y				+= processor_core.o
 acpi-$(CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC) += processor_pdc.o
 acpi-y				+= ec.o
 acpi-$(CONFIG_ACPI_DOCK)	+= dock.o
-acpi-y				+= pci_root.o pci_link.o pci_irq.o
+acpi-$(CONFIG_PCI)		+= pci_root.o pci_link.o pci_irq.o
 obj-$(CONFIG_ACPI_MCFG)		+= pci_mcfg.o
 acpi-y				+= acpi_lpss.o acpi_apd.o
 acpi-y				+= acpi_platform.o
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 530a3f675490..b7060dae2789 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -25,8 +25,13 @@ int acpi_osi_init(void);
 acpi_status acpi_os_initialize1(void);
 void init_acpi_device_notify(void);
 int acpi_scan_init(void);
+#ifdef CONFIG_PCI
 void acpi_pci_root_init(void);
 void acpi_pci_link_init(void);
+#else
+static inline void acpi_pci_root_init(void) {}
+static inline void acpi_pci_link_init(void) {}
+#endif
 void acpi_processor_init(void);
 void acpi_platform_init(void);
 void acpi_pnp_init(void);
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index f2bda77a2df1..657d642fcc67 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -11,6 +11,7 @@ ifdef CONFIG_PCI
 obj-$(CONFIG_PROC_FS)		+= proc.o
 obj-$(CONFIG_SYSFS)		+= slot.o
 obj-$(CONFIG_OF)		+= of.o
+obj-$(CONFIG_ACPI)		+= pci-acpi.o
 endif
 
 obj-$(CONFIG_PCI_QUIRKS)	+= quirks.o
@@ -20,7 +21,6 @@ obj-$(CONFIG_PCI_MSI)		+= msi.o
 obj-$(CONFIG_PCI_ATS)		+= ats.o
 obj-$(CONFIG_PCI_IOV)		+= iov.o
 obj-$(CONFIG_PCI_BRIDGE_EMUL)	+= pci-bridge-emul.o
-obj-$(CONFIG_ACPI)		+= pci-acpi.o
 obj-$(CONFIG_PCI_LABEL)		+= pci-label.o
 obj-$(CONFIG_X86_INTEL_MID)	+= pci-mid.o
 obj-$(CONFIG_PCI_SYSCALL)	+= syscall.o
diff --git a/include/acpi/acpi_drivers.h b/include/acpi/acpi_drivers.h
index 14499757338f..de1804aeaf69 100644
--- a/include/acpi/acpi_drivers.h
+++ b/include/acpi/acpi_drivers.h
@@ -88,7 +88,14 @@ int acpi_pci_link_free_irq(acpi_handle handle);
 
 struct pci_bus;
 
+#ifdef CONFIG_PCI
 struct pci_dev *acpi_get_pci_dev(acpi_handle);
+#else
+static inline struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
+{
+	return NULL;
+}
+#endif
 
 /* Arch-defined function to add a bus to the system */
 
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index ed80f147bd50..eb1fdf4c196a 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -340,7 +340,14 @@ struct pci_dev;
 int acpi_pci_irq_enable (struct pci_dev *dev);
 void acpi_penalize_isa_irq(int irq, int active);
 bool acpi_isa_irq_available(int irq);
+#ifdef CONFIG_PCI
 void acpi_penalize_sci_irq(int irq, int trigger, int polarity);
+#else
+static inline void acpi_penalize_sci_irq(int irq, int trigger,
+					int polarity)
+{
+}
+#endif
 void acpi_pci_irq_disable (struct pci_dev *dev);
 
 extern int ec_read(u8 addr, u8 *val);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 11c71c4ecf75..51a5a5217667 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1960,7 +1960,11 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev,
 				 enum pcie_reset_state state);
 int pcibios_add_device(struct pci_dev *dev);
 void pcibios_release_device(struct pci_dev *dev);
+#ifdef CONFIG_PCI
 void pcibios_penalize_isa_irq(int irq, int active);
+#else
+static inline void pcibios_penalize_isa_irq(int irq, int active) {}
+#endif
 int pcibios_alloc_irq(struct pci_dev *dev);
 void pcibios_free_irq(struct pci_dev *dev);
 resource_size_t pcibios_default_alignment(void);
-- 
2.19.0

[PATCH v12 5/7] arm64: select ACPI PCI code only when both features are enabled

[Sinan Kaya]

ACPI and PCI are no longer coupled to each other. Specify requirements
for both when pulling in code.

Signed-off-by: Sinan Kaya <okaya@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/Kconfig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index ea2ab0330e3a..bcb6262044d8 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -5,7 +5,7 @@ config ARM64
 	select ACPI_GTDT if ACPI
 	select ACPI_IORT if ACPI
 	select ACPI_REDUCED_HARDWARE_ONLY if ACPI
-	select ACPI_MCFG if ACPI
+	select ACPI_MCFG if (ACPI && PCI)
 	select ACPI_SPCR_TABLE if ACPI
 	select ACPI_PPTT if ACPI
 	select ARCH_CLOCKSOURCE_DATA
@@ -163,7 +163,7 @@ config ARM64
 	select OF
 	select OF_EARLY_FLATTREE
 	select OF_RESERVED_MEM
-	select PCI_ECAM if ACPI
+	select PCI_ECAM if (ACPI && PCI)
 	select POWER_RESET
 	select POWER_SUPPLY
 	select REFCOUNT_FULL
-- 
2.19.0

[PATCH v12 6/7] ACPI/IORT: Stub out ACS functions when CONFIG_PCI is not set

[Sinan Kaya]

Remove PCI dependent code out of iort.c when CONFIG_PCI is not defined.
A quick search reveals the following functions:
1. pci_request_acs()
2. pci_domain_nr()
3. pci_is_root_bus()
4. to_pci_dev()

Both pci_domain_nr() and pci_is_root_bus() are defined in linux/pci.h.
pci_domain_nr() is a stub function when CONFIG_PCI is not set and
pci_is_root_bus() just returns a reference to a structure member which
is still valid without CONFIG_PCI set.

to_pci_dev() is a macro that expands to container_of.

pci_request_acs() is the only code that gets pulled in from drivers/pci/*.c

Signed-off-by: Sinan Kaya <okaya@kernel.org>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
---
 drivers/acpi/arm64/iort.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 70f4e80b9246..2159ad9bf9ed 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -1435,8 +1435,14 @@ static int __init iort_add_platform_device(struct acpi_iort_node *node,
 	return ret;
 }
 
-static bool __init iort_enable_acs(struct acpi_iort_node *iort_node)
+#ifdef CONFIG_PCI
+static void __init iort_enable_acs(struct acpi_iort_node *iort_node)
 {
+	static bool acs_enabled __initdata;
+
+	if (acs_enabled)
+		return;
+
 	if (iort_node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
 		struct acpi_iort_node *parent;
 		struct acpi_iort_id_mapping *map;
@@ -1458,13 +1464,15 @@ static bool __init iort_enable_acs(struct acpi_iort_node *iort_node)
 			if ((parent->type == ACPI_IORT_NODE_SMMU) ||
 				(parent->type == ACPI_IORT_NODE_SMMU_V3)) {
 				pci_request_acs();
-				return true;
+				acs_enabled = true;
+				return;
 			}
 		}
 	}
-
-	return false;
 }
+#else
+static inline void iort_enable_acs(struct acpi_iort_node *iort_node) { }
+#endif
 
 static void __init iort_init_platform_devices(void)
 {
@@ -1472,7 +1480,6 @@ static void __init iort_init_platform_devices(void)
 	struct acpi_table_iort *iort;
 	struct fwnode_handle *fwnode;
 	int i, ret;
-	bool acs_enabled = false;
 	const struct iort_dev_config *ops;
 
 	/*
@@ -1493,8 +1500,7 @@ static void __init iort_init_platform_devices(void)
 			return;
 		}
 
-		if (!acs_enabled)
-			acs_enabled = iort_enable_acs(iort_node);
+		iort_enable_acs(iort_node);
 
 		ops = iort_get_dev_cfg(iort_node);
 		if (ops) {
-- 
2.19.0

[PATCH v12 7/7] ACPI: Make PCI slot detection driver depend on PCI

[Sinan Kaya]

Since this is ACPI PCI slot detection driver for PCI, it doesn't make sense
to compile this without PCI support in place.

Signed-off-by: Sinan Kaya <okaya@kernel.org>
---
 drivers/acpi/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index a0abcb3bd673..8b6ff80a69cd 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -369,7 +369,7 @@ config ACPI_DEBUG
 
 config ACPI_PCI_SLOT
 	bool "PCI slot detection driver"
-	depends on SYSFS
+	depends on SYSFS && PCI
 	help
 	  This driver creates entries in /sys/bus/pci/slots/ for all PCI
 	  slots in the system.  This can help correlate PCI bus addresses,
-- 
2.19.0