>From ad4c3f135cda6f5210735231d30ef8e9dbd58c7c Mon Sep 17 00:00:00 2001
From: Matthew Wilcox <matthew@wil.cx>
Date: Sun, 10 Feb 2008 09:45:28 -0500
Subject: [PATCH] Change pci_raw_ops to pci_raw_read/write

We want to allow different implementations of pci_raw_ops for standard
and extended config space on x86.  Rather than clutter generic code with
knowledge of this, we make pci_raw_ops private to x86 and use it to
implement the new raw interface -- raw_pci_read() and raw_pci_write().

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
---
 arch/ia64/pci/pci.c               |   25 ++++++++-----------------
 arch/ia64/sn/pci/tioce_provider.c |   16 ++++++++--------
 arch/x86/kernel/quirks.c          |    2 +-
 arch/x86/pci/common.c             |   25 +++++++++++++++++++++++--
 arch/x86/pci/direct.c             |    4 ++--
 arch/x86/pci/fixup.c              |    6 ++++--
 arch/x86/pci/legacy.c             |    2 +-
 arch/x86/pci/mmconfig-shared.c    |    6 +++---
 arch/x86/pci/mmconfig_32.c        |   10 ++--------
 arch/x86/pci/mmconfig_64.c        |    8 +-------
 arch/x86/pci/pci.h                |   15 +++++++++++----
 arch/x86/pci/visws.c              |    3 ---
 drivers/acpi/osl.c                |   25 ++++++-------------------
 include/linux/pci.h               |   16 ++++++++--------
 14 files changed, 78 insertions(+), 85 deletions(-)

diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 488e48a..8fd7e82 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -43,8 +43,7 @@
 #define PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg)	\
 	(((u64) seg << 28) | (bus << 20) | (devfn << 12) | (reg))
 
-static int
-pci_sal_read (unsigned int seg, unsigned int bus, unsigned int devfn,
+int raw_pci_read(unsigned int seg, unsigned int bus, unsigned int devfn,
 	      int reg, int len, u32 *value)
 {
 	u64 addr, data = 0;
@@ -68,8 +67,7 @@ pci_sal_read (unsigned int seg, unsigned int bus, unsigned int devfn,
 	return 0;
 }
 
-static int
-pci_sal_write (unsigned int seg, unsigned int bus, unsigned int devfn,
+int raw_pci_write(unsigned int seg, unsigned int bus, unsigned int devfn,
 	       int reg, int len, u32 value)
 {
 	u64 addr;
@@ -91,24 +89,17 @@ pci_sal_write (unsigned int seg, unsigned int bus, unsigned int devfn,
 	return 0;
 }
 
-static struct pci_raw_ops pci_sal_ops = {
-	.read =		pci_sal_read,
-	.write =	pci_sal_write
-};
-
-struct pci_raw_ops *raw_pci_ops = &pci_sal_ops;
-
-static int
-pci_read (struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
+static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
+							int size, u32 *value)
 {
-	return raw_pci_ops->read(pci_domain_nr(bus), bus->number,
+	return raw_pci_read(pci_domain_nr(bus), bus->number,
 				 devfn, where, size, value);
 }
 
-static int
-pci_write (struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
+static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
+							int size, u32 value)
 {
-	return raw_pci_ops->write(pci_domain_nr(bus), bus->number,
+	return raw_pci_write(pci_domain_nr(bus), bus->number,
 				  devfn, where, size, value);
 }
 
diff --git a/arch/ia64/sn/pci/tioce_provider.c b/arch/ia64/sn/pci/tioce_provider.c
index e1a3e19..999f14f 100644
--- a/arch/ia64/sn/pci/tioce_provider.c
+++ b/arch/ia64/sn/pci/tioce_provider.c
@@ -752,13 +752,13 @@ tioce_kern_init(struct tioce_common *tioce_common)
 	 * Determine the secondary bus number of the port2 logical PPB.
 	 * This is used to decide whether a given pci device resides on
 	 * port1 or port2.  Note:  We don't have enough plumbing set up
-	 * here to use pci_read_config_xxx() so use the raw_pci_ops vector.
+	 * here to use pci_read_config_xxx() so use raw_pci_read().
 	 */
 
 	seg = tioce_common->ce_pcibus.bs_persist_segment;
 	bus = tioce_common->ce_pcibus.bs_persist_busnum;
 
-	raw_pci_ops->read(seg, bus, PCI_DEVFN(2, 0), PCI_SECONDARY_BUS, 1,&tmp);
+	raw_pci_read(seg, bus, PCI_DEVFN(2, 0), PCI_SECONDARY_BUS, 1,&tmp);
 	tioce_kern->ce_port1_secondary = (u8) tmp;
 
 	/*
@@ -799,11 +799,11 @@ tioce_kern_init(struct tioce_common *tioce_common)
 
 		/* mem base/limit */
 
-		raw_pci_ops->read(seg, bus, PCI_DEVFN(dev, 0),
+		raw_pci_read(seg, bus, PCI_DEVFN(dev, 0),
 				  PCI_MEMORY_BASE, 2, &tmp);
 		base = (u64)tmp << 16;
 
-		raw_pci_ops->read(seg, bus, PCI_DEVFN(dev, 0),
+		raw_pci_read(seg, bus, PCI_DEVFN(dev, 0),
 				  PCI_MEMORY_LIMIT, 2, &tmp);
 		limit = (u64)tmp << 16;
 		limit |= 0xfffffUL;
@@ -817,21 +817,21 @@ tioce_kern_init(struct tioce_common *tioce_common)
 		 * attributes.
 		 */
 
-		raw_pci_ops->read(seg, bus, PCI_DEVFN(dev, 0),
+		raw_pci_read(seg, bus, PCI_DEVFN(dev, 0),
 				  PCI_PREF_MEMORY_BASE, 2, &tmp);
 		base = ((u64)tmp & PCI_PREF_RANGE_MASK) << 16;
 
-		raw_pci_ops->read(seg, bus, PCI_DEVFN(dev, 0),
+		raw_pci_read(seg, bus, PCI_DEVFN(dev, 0),
 				  PCI_PREF_BASE_UPPER32, 4, &tmp);
 		base |= (u64)tmp << 32;
 
-		raw_pci_ops->read(seg, bus, PCI_DEVFN(dev, 0),
+		raw_pci_read(seg, bus, PCI_DEVFN(dev, 0),
 				  PCI_PREF_MEMORY_LIMIT, 2, &tmp);
 
 		limit = ((u64)tmp & PCI_PREF_RANGE_MASK) << 16;
 		limit |= 0xfffffUL;
 
-		raw_pci_ops->read(seg, bus, PCI_DEVFN(dev, 0),
+		raw_pci_read(seg, bus, PCI_DEVFN(dev, 0),
 				  PCI_PREF_LIMIT_UPPER32, 4, &tmp);
 		limit |= (u64)tmp << 32;
 
diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c
index 6ba33ca..1941482 100644
--- a/arch/x86/kernel/quirks.c
+++ b/arch/x86/kernel/quirks.c
@@ -27,7 +27,7 @@ static void __devinit quirk_intel_irqbalance(struct pci_dev *dev)
 	pci_write_config_byte(dev, 0xf4, config|0x2);
 
 	/* read xTPR register */
-	raw_pci_ops->read(0, 0, 0x40, 0x4c, 2, &word);
+	raw_pci_read(0, 0, 0x40, 0x4c, 2, &word);
 
 	if (!(word & (1 << 13))) {
 		dev_info(&dev->dev, "Intel E7520/7320/7525 detected; "
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 52deabc..b7c67a1 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -26,16 +26,37 @@ int pcibios_last_bus = -1;
 unsigned long pirq_table_addr;
 struct pci_bus *pci_root_bus;
 struct pci_raw_ops *raw_pci_ops;
+struct pci_raw_ops *raw_pci_ext_ops;
+
+int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
+						int reg, int len, u32 *val)
+{
+	if (reg < 256 && raw_pci_ops)
+		return raw_pci_ops->read(domain, bus, devfn, reg, len, val);
+	if (raw_pci_ext_ops)
+		return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);
+	return -EINVAL;
+}
+
+int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
+						int reg, int len, u32 val)
+{
+	if (reg < 256 && raw_pci_ops)
+		return raw_pci_ops->write(domain, bus, devfn, reg, len, val);
+	if (raw_pci_ext_ops)
+		return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);
+	return -EINVAL;
+}
 
 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
 {
-	return raw_pci_ops->read(pci_domain_nr(bus), bus->number,
+	return raw_pci_read(pci_domain_nr(bus), bus->number,
 				 devfn, where, size, value);
 }
 
 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
 {
-	return raw_pci_ops->write(pci_domain_nr(bus), bus->number,
+	return raw_pci_write(pci_domain_nr(bus), bus->number,
 				  devfn, where, size, value);
 }
 
diff --git a/arch/x86/pci/direct.c b/arch/x86/pci/direct.c
index 431c9a5..42f3e4c 100644
--- a/arch/x86/pci/direct.c
+++ b/arch/x86/pci/direct.c
@@ -14,7 +14,7 @@
 #define PCI_CONF1_ADDRESS(bus, devfn, reg) \
 	(0x80000000 | (bus << 16) | (devfn << 8) | (reg & ~3))
 
-int pci_conf1_read(unsigned int seg, unsigned int bus,
+static int pci_conf1_read(unsigned int seg, unsigned int bus,
 			  unsigned int devfn, int reg, int len, u32 *value)
 {
 	unsigned long flags;
@@ -45,7 +45,7 @@ int pci_conf1_read(unsigned int seg, unsigned int bus,
 	return 0;
 }
 
-int pci_conf1_write(unsigned int seg, unsigned int bus,
+static int pci_conf1_write(unsigned int seg, unsigned int bus,
 			   unsigned int devfn, int reg, int len, u32 value)
 {
 	unsigned long flags;
diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c
index 74d30ff..a5ef5f5 100644
--- a/arch/x86/pci/fixup.c
+++ b/arch/x86/pci/fixup.c
@@ -215,7 +215,8 @@ static int quirk_aspm_offset[MAX_PCIEROOT << 3];
 
 static int quirk_pcie_aspm_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
 {
-	return raw_pci_ops->read(0, bus->number, devfn, where, size, value);
+	return raw_pci_read(pci_domain_nr(bus), bus->number,
+						devfn, where, size, value);
 }
 
 /*
@@ -231,7 +232,8 @@ static int quirk_pcie_aspm_write(struct pci_bus *bus, unsigned int devfn, int wh
 	if ((offset) && (where == offset))
 		value = value & 0xfffffffc;
 
-	return raw_pci_ops->write(0, bus->number, devfn, where, size, value);
+	return raw_pci_write(pci_domain_nr(bus), bus->number,
+						devfn, where, size, value);
 }
 
 static struct pci_ops quirk_pcie_aspm_ops = {
diff --git a/arch/x86/pci/legacy.c b/arch/x86/pci/legacy.c
index 5565d70..e041ced 100644
--- a/arch/x86/pci/legacy.c
+++ b/arch/x86/pci/legacy.c
@@ -22,7 +22,7 @@ static void __devinit pcibios_fixup_peer_bridges(void)
 		if (pci_find_bus(0, n))
 			continue;
 		for (devfn = 0; devfn < 256; devfn += 8) {
-			if (!raw_pci_ops->read(0, n, devfn, PCI_VENDOR_ID, 2, &l) &&
+			if (!raw_pci_read(0, n, devfn, PCI_VENDOR_ID, 2, &l) &&
 			    l != 0x0000 && l != 0xffff) {
 				DBG("Found device at %02x:%02x [%04x]\n", n, devfn, l);
 				printk(KERN_INFO "PCI: Discovered peer bus %02x\n", n);
diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index 6b521d3..8d54df4 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -28,7 +28,7 @@ static int __initdata pci_mmcfg_resources_inserted;
 static const char __init *pci_mmcfg_e7520(void)
 {
 	u32 win;
-	pci_conf1_read(0, 0, PCI_DEVFN(0,0), 0xce, 2, &win);
+	pci_direct_conf1.read(0, 0, PCI_DEVFN(0,0), 0xce, 2, &win);
 
 	win = win & 0xf000;
 	if(win == 0x0000 || win == 0xf000)
@@ -53,7 +53,7 @@ static const char __init *pci_mmcfg_intel_945(void)
 
 	pci_mmcfg_config_num = 1;
 
-	pci_conf1_read(0, 0, PCI_DEVFN(0,0), 0x48, 4, &pciexbar);
+	pci_direct_conf1.read(0, 0, PCI_DEVFN(0,0), 0x48, 4, &pciexbar);
 
 	/* Enable bit */
 	if (!(pciexbar & 1))
@@ -118,7 +118,7 @@ static int __init pci_mmcfg_check_hostbridge(void)
 	int i;
 	const char *name;
 
-	pci_conf1_read(0, 0, PCI_DEVFN(0,0), 0, 4, &l);
+	pci_direct_conf1.read(0, 0, PCI_DEVFN(0,0), 0, 4, &l);
 	vendor = l & 0xffff;
 	device = (l >> 16) & 0xffff;
 
diff --git a/arch/x86/pci/mmconfig_32.c b/arch/x86/pci/mmconfig_32.c
index 7b75e65..081816a 100644
--- a/arch/x86/pci/mmconfig_32.c
+++ b/arch/x86/pci/mmconfig_32.c
@@ -68,9 +68,6 @@ err:		*value = -1;
 		return -EINVAL;
 	}
 
-	if (reg < 256)
-		return pci_conf1_read(seg,bus,devfn,reg,len,value);
-
 	base = get_base_addr(seg, bus, devfn);
 	if (!base)
 		goto err;
@@ -104,9 +101,6 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
 	if ((bus > 255) || (devfn > 255) || (reg > 4095))
 		return -EINVAL;
 
-	if (reg < 256)
-		return pci_conf1_write(seg,bus,devfn,reg,len,value);
-
 	base = get_base_addr(seg, bus, devfn);
 	if (!base)
 		return -EINVAL;
@@ -138,7 +132,7 @@ static struct pci_raw_ops pci_mmcfg = {
 
 int __init pci_mmcfg_arch_init(void)
 {
-	printk(KERN_INFO "PCI: Using MMCONFIG\n");
-	raw_pci_ops = &pci_mmcfg;
+	printk(KERN_INFO "PCI: Using MMCONFIG for extended config space\n");
+	raw_pci_ext_ops = &pci_mmcfg;
 	return 1;
 }
diff --git a/arch/x86/pci/mmconfig_64.c b/arch/x86/pci/mmconfig_64.c
index c4cf318..9207fd4 100644
--- a/arch/x86/pci/mmconfig_64.c
+++ b/arch/x86/pci/mmconfig_64.c
@@ -58,9 +58,6 @@ err:		*value = -1;
 		return -EINVAL;
 	}
 
-	if (reg < 256)
-		return pci_conf1_read(seg,bus,devfn,reg,len,value);
-
 	addr = pci_dev_base(seg, bus, devfn);
 	if (!addr)
 		goto err;
@@ -89,9 +86,6 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
 	if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095)))
 		return -EINVAL;
 
-	if (reg < 256)
-		return pci_conf1_write(seg,bus,devfn,reg,len,value);
-
 	addr = pci_dev_base(seg, bus, devfn);
 	if (!addr)
 		return -EINVAL;
@@ -150,6 +144,6 @@ int __init pci_mmcfg_arch_init(void)
 			return 0;
 		}
 	}
-	raw_pci_ops = &pci_mmcfg;
+	raw_pci_ext_ops = &pci_mmcfg;
 	return 1;
 }
diff --git a/arch/x86/pci/pci.h b/arch/x86/pci/pci.h
index 36cb44c..3431518 100644
--- a/arch/x86/pci/pci.h
+++ b/arch/x86/pci/pci.h
@@ -85,10 +85,17 @@ extern spinlock_t pci_config_lock;
 extern int (*pcibios_enable_irq)(struct pci_dev *dev);
 extern void (*pcibios_disable_irq)(struct pci_dev *dev);
 
-extern int pci_conf1_write(unsigned int seg, unsigned int bus,
-			   unsigned int devfn, int reg, int len, u32 value);
-extern int pci_conf1_read(unsigned int seg, unsigned int bus,
-			  unsigned int devfn, int reg, int len, u32 *value);
+struct pci_raw_ops {
+	int (*read)(unsigned int domain, unsigned int bus, unsigned int devfn,
+						int reg, int len, u32 *val);
+	int (*write)(unsigned int domain, unsigned int bus, unsigned int devfn,
+						int reg, int len, u32 val);
+};
+
+extern struct pci_raw_ops *raw_pci_ops;
+extern struct pci_raw_ops *raw_pci_ext_ops;
+
+extern struct pci_raw_ops pci_direct_conf1;
 
 extern int pci_direct_probe(void);
 extern void pci_direct_init(int type);
diff --git a/arch/x86/pci/visws.c b/arch/x86/pci/visws.c
index 8ecb1c7..c2df4e9 100644
--- a/arch/x86/pci/visws.c
+++ b/arch/x86/pci/visws.c
@@ -13,9 +13,6 @@
 
 #include "pci.h"
 
-
-extern struct pci_raw_ops pci_direct_conf1;
-
 static int pci_visws_enable_irq(struct pci_dev *dev) { return 0; }
 static void pci_visws_disable_irq(struct pci_dev *dev) { }
 
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index a14501c..34b3386 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -200,15 +200,6 @@ acpi_status __init acpi_os_initialize(void)
 
 acpi_status acpi_os_initialize1(void)
 {
-	/*
-	 * Initialize PCI configuration space access, as we'll need to access
-	 * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
-	 */
-	if (!raw_pci_ops) {
-		printk(KERN_ERR PREFIX
-		       "Access to PCI configuration space unavailable\n");
-		return AE_NULL_ENTRY;
-	}
 	kacpid_wq = create_singlethread_workqueue("kacpid");
 	kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 	BUG_ON(!kacpid_wq);
@@ -653,11 +644,9 @@ acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 		return AE_ERROR;
 	}
 
-	BUG_ON(!raw_pci_ops);
-
-	result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
-				   PCI_DEVFN(pci_id->device, pci_id->function),
-				   reg, size, value);
+	result = raw_pci_read(pci_id->segment, pci_id->bus,
+				PCI_DEVFN(pci_id->device, pci_id->function),
+				reg, size, value);
 
 	return (result ? AE_ERROR : AE_OK);
 }
@@ -682,11 +671,9 @@ acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 		return AE_ERROR;
 	}
 
-	BUG_ON(!raw_pci_ops);
-
-	result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
-				    PCI_DEVFN(pci_id->device, pci_id->function),
-				    reg, size, value);
+	result = raw_pci_write(pci_id->segment, pci_id->bus,
+				PCI_DEVFN(pci_id->device, pci_id->function),
+				reg, size, value);
 
 	return (result ? AE_ERROR : AE_OK);
 }
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 7215d3b..87195b6 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -301,14 +301,14 @@ struct pci_ops {
 	int (*write)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val);
 };
 
-struct pci_raw_ops {
-	int (*read)(unsigned int domain, unsigned int bus, unsigned int devfn,
-		    int reg, int len, u32 *val);
-	int (*write)(unsigned int domain, unsigned int bus, unsigned int devfn,
-		     int reg, int len, u32 val);
-};
-
-extern struct pci_raw_ops *raw_pci_ops;
+/*
+ * ACPI needs to be able to access PCI config space before we've done a
+ * PCI bus scan and created pci_bus structures.
+ */
+extern int raw_pci_read(unsigned int domain, unsigned int bus,
+			unsigned int devfn, int reg, int len, u32 *val);
+extern int raw_pci_write(unsigned int domain, unsigned int bus,
+			unsigned int devfn, int reg, int len, u32 val);
 
 struct pci_bus_region {
 	resource_size_t start;
-- 
1.5.2.5