Merge branch 'topic/jiang-mmconfig-v10' into next

* topic/jiang-mmconfig-v10:
  ACPI: mark acpi_sfi_table_parse() as __init
  x86/PCI: use pr_level() to replace printk(KERN_LEVEL)
  x86/PCI: refine __pci_mmcfg_init() for better code readability
  x86/PCI: get rid of redundant log messages
  x86/PCI: simplify pci_mmcfg_late_insert_resources()
  x86/PCI: update MMCONFIG information when hot-plugging PCI host bridges
  PCI/ACPI: provide MMCONFIG address for PCI host bridges
  x86/PCI: add pci_mmconfig_insert()/delete() for PCI root bridge hotplug
  x86/PCI: prepare pci_mmcfg_check_reserved() to be called at runtime
  x86/PCI: introduce pci_mmcfg_arch_map()/pci_mmcfg_arch_unmap()
  x86/PCI: use RCU list to protect mmconfig list
  x86/PCI: split out pci_mmconfig_alloc() for code reuse
  x86/PCI: split out pci_mmcfg_check_reserved() for code reuse

arch/x86/include/asm/pci_x86.h

@@ -100,6 +100,7 @@ struct pci_raw_ops {
 extern const struct pci_raw_ops *raw_pci_ops;
 extern const struct pci_raw_ops *raw_pci_ext_ops;
 
+extern const struct pci_raw_ops pci_mmcfg;
 extern const struct pci_raw_ops pci_direct_conf1;
 extern bool port_cf9_safe;
 
@@ -135,6 +136,12 @@ struct pci_mmcfg_region {
 
 extern int __init pci_mmcfg_arch_init(void);
 extern void __init pci_mmcfg_arch_free(void);
+extern int __devinit pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg);
+extern void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg);
+extern int __devinit pci_mmconfig_insert(struct device *dev,
+					 u16 seg, u8 start,
+					 u8 end, phys_addr_t addr);
+extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
 extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
 
 extern struct list_head pci_mmcfg_list;

arch/x86/pci/acpi.c

@@ -13,6 +13,12 @@ struct pci_root_info {
 	unsigned int res_num;
 	struct resource *res;
 	struct pci_sysdata sd;
+#ifdef	CONFIG_PCI_MMCONFIG
+	bool mcfg_added;
+	u16 segment;
+	u8 start_bus;
+	u8 end_bus;
+#endif
 };
 
 static bool pci_use_crs = true;
@@ -119,6 +125,81 @@ void __init pci_acpi_crs_quirks(void)
 	       pci_use_crs ? "nocrs" : "use_crs");
 }
 
+#ifdef	CONFIG_PCI_MMCONFIG
+static int __devinit check_segment(u16 seg, struct device *dev, char *estr)
+{
+	if (seg) {
+		dev_err(dev,
+			"%s can't access PCI configuration "
+			"space under this host bridge.\n",
+			estr);
+		return -EIO;
+	}
+
+	/*
+	 * Failure in adding MMCFG information is not fatal,
+	 * just can't access extended configuration space of
+	 * devices under this host bridge.
+	 */
+	dev_warn(dev,
+		 "%s can't access extended PCI configuration "
+		 "space under this bridge.\n",
+		 estr);
+
+	return 0;
+}
+
+static int __devinit setup_mcfg_map(struct pci_root_info *info,
+				    u16 seg, u8 start, u8 end,
+				    phys_addr_t addr)
+{
+	int result;
+	struct device *dev = &info->bridge->dev;
+
+	info->start_bus = start;
+	info->end_bus = end;
+	info->mcfg_added = false;
+
+	/* return success if MMCFG is not in use */
+	if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
+		return 0;
+
+	if (!(pci_probe & PCI_PROBE_MMCONF))
+		return check_segment(seg, dev, "MMCONFIG is disabled,");
+
+	result = pci_mmconfig_insert(dev, seg, start, end, addr);
+	if (result == 0) {
+		/* enable MMCFG if it hasn't been enabled yet */
+		if (raw_pci_ext_ops == NULL)
+			raw_pci_ext_ops = &pci_mmcfg;
+		info->mcfg_added = true;
+	} else if (result != -EEXIST)
+		return check_segment(seg, dev,
+			 "fail to add MMCONFIG information,");
+
+	return 0;
+}
+
+static void teardown_mcfg_map(struct pci_root_info *info)
+{
+	if (info->mcfg_added) {
+		pci_mmconfig_delete(info->segment, info->start_bus,
+				    info->end_bus);
+		info->mcfg_added = false;
+	}
+}
+#else
+static int __devinit setup_mcfg_map(struct pci_root_info *info,
+				    u16 seg, u8 start, u8 end,
+				    phys_addr_t addr)
+{
+	return 0;
+}
+static void teardown_mcfg_map(struct pci_root_info *info)
+{
+}
+#endif
+
 static acpi_status
 resource_to_addr(struct acpi_resource *resource,
 			struct acpi_resource_address64 *addr)
@@ -233,13 +314,6 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
 	}
 
 	info->res_num++;
-	if (addr.translation_offset)
-		dev_info(&info->bridge->dev, "host bridge window %pR "
-			 "(PCI address [%#llx-%#llx])\n",
-			 res, res->start - addr.translation_offset,
-			 res->end - addr.translation_offset);
-	else
-		dev_info(&info->bridge->dev, "host bridge window %pR\n", res);
 
 	return AE_OK;
 }
@@ -331,8 +405,11 @@ static void __release_pci_root_info(struct pci_root_info *info)
 
 	free_pci_root_info_res(info);
 
+	teardown_mcfg_map(info);
+
 	kfree(info);
 }
+
 static void release_pci_root_info(struct pci_host_bridge *bridge)
 {
 	struct pci_root_info *info = bridge->release_data;
@@ -372,7 +449,7 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
 	int domain = root->segment;
 	int busnum = root->secondary.start;
 	LIST_HEAD(resources);
-	struct pci_bus *bus;
+	struct pci_bus *bus = NULL;
 	struct pci_sysdata *sd;
 	int node;
 #ifdef CONFIG_ACPI_NUMA
@@ -438,8 +515,11 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
 			x86_pci_root_bus_resources(busnum, &resources);
 		}
 
-		bus = pci_create_root_bus(NULL, busnum, &pci_root_ops, sd,
-					  &resources);
+		if (!setup_mcfg_map(info, domain, (u8)root->secondary.start,
+				    (u8)root->secondary.end, root->mcfg_addr))
+			bus = pci_create_root_bus(NULL, busnum, &pci_root_ops,
+						  sd, &resources);
+
 		if (bus) {
 			pci_scan_child_bus(bus);
 			pci_set_host_bridge_release(

arch/x86/pci/mmconfig_32.c

@@ -11,6 +11,7 @@
 
 #include <linux/pci.h>
 #include <linux/init.h>
+#include <linux/rcupdate.h>
 #include <asm/e820.h>
 #include <asm/pci_x86.h>
 #include <acpi/acpi.h>
@@ -60,9 +61,12 @@ err:		*value = -1;
 		return -EINVAL;
 	}
 
+	rcu_read_lock();
 	base = get_base_addr(seg, bus, devfn);
-	if (!base)
+	if (!base) {
+		rcu_read_unlock();
 		goto err;
+	}
 
 	raw_spin_lock_irqsave(&pci_config_lock, flags);
 
@@ -80,6 +84,7 @@ err:		*value = -1;
 		break;
 	}
 	raw_spin_unlock_irqrestore(&pci_config_lock, flags);
+	rcu_read_unlock();
 
 	return 0;
 }
@@ -93,9 +98,12 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
 	if ((bus > 255) || (devfn > 255) || (reg > 4095))
 		return -EINVAL;
 
+	rcu_read_lock();
 	base = get_base_addr(seg, bus, devfn);
-	if (!base)
+	if (!base) {
+		rcu_read_unlock();
 		return -EINVAL;
+	}
 
 	raw_spin_lock_irqsave(&pci_config_lock, flags);
 
@@ -113,11 +121,12 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
 		break;
 	}
 	raw_spin_unlock_irqrestore(&pci_config_lock, flags);
+	rcu_read_unlock();
 
 	return 0;
 }
 
-static const struct pci_raw_ops pci_mmcfg = {
+const struct pci_raw_ops pci_mmcfg = {
 	.read =		pci_mmcfg_read,
 	.write =	pci_mmcfg_write,
 };
@@ -132,3 +141,18 @@ int __init pci_mmcfg_arch_init(void)
 void __init pci_mmcfg_arch_free(void)
 {
 }
+
+int __devinit pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg)
+{
+	return 0;
+}
+
+void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg)
+{
+	unsigned long flags;
+
+	/* Invalidate the cached mmcfg map entry. */
+	raw_spin_lock_irqsave(&pci_config_lock, flags);
+	mmcfg_last_accessed_device = 0;
+	raw_spin_unlock_irqrestore(&pci_config_lock, flags);
+}

arch/x86/pci/mmconfig_64.c

@@ -9,6 +9,7 @@
 #include <linux/init.h>
 #include <linux/acpi.h>
 #include <linux/bitmap.h>
+#include <linux/rcupdate.h>
 #include <asm/e820.h>
 #include <asm/pci_x86.h>
 
@@ -34,9 +35,12 @@ err:		*value = -1;
 		return -EINVAL;
 	}
 
+	rcu_read_lock();
 	addr = pci_dev_base(seg, bus, devfn);
-	if (!addr)
+	if (!addr) {
+		rcu_read_unlock();
 		goto err;
+	}
 
 	switch (len) {
 	case 1:
@@ -49,6 +53,7 @@ err:		*value = -1;
 		*value = mmio_config_readl(addr + reg);
 		break;
 	}
+	rcu_read_unlock();
 
 	return 0;
 }
@@ -62,9 +67,12 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
 	if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095)))
 		return -EINVAL;
 
+	rcu_read_lock();
 	addr = pci_dev_base(seg, bus, devfn);
-	if (!addr)
+	if (!addr) {
+		rcu_read_unlock();
 		return -EINVAL;
+	}
 
 	switch (len) {
 	case 1:
@@ -77,16 +85,17 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
 		mmio_config_writel(addr + reg, value);
 		break;
 	}
+	rcu_read_unlock();
 
 	return 0;
 }
 
-static const struct pci_raw_ops pci_mmcfg = {
+const struct pci_raw_ops pci_mmcfg = {
 	.read =		pci_mmcfg_read,
 	.write =	pci_mmcfg_write,
 };
 
-static void __iomem * __init mcfg_ioremap(struct pci_mmcfg_region *cfg)
+static void __iomem * __devinit mcfg_ioremap(struct pci_mmcfg_region *cfg)
 {
 	void __iomem *addr;
 	u64 start, size;
@@ -105,16 +114,14 @@ int __init pci_mmcfg_arch_init(void)
 {
 	struct pci_mmcfg_region *cfg;
 
-	list_for_each_entry(cfg, &pci_mmcfg_list, list) {
-		cfg->virt = mcfg_ioremap(cfg);
-		if (!cfg->virt) {
-			printk(KERN_ERR PREFIX "can't map MMCONFIG at %pR\n",
-			       &cfg->res);
+	list_for_each_entry(cfg, &pci_mmcfg_list, list)
+		if (pci_mmcfg_arch_map(cfg)) {
 			pci_mmcfg_arch_free();
 			return 0;
 		}
-	}
+
 	raw_pci_ext_ops = &pci_mmcfg;
+
 	return 1;
 }
 
@@ -122,10 +129,25 @@ void __init pci_mmcfg_arch_free(void)
 {
 	struct pci_mmcfg_region *cfg;
 
-	list_for_each_entry(cfg, &pci_mmcfg_list, list) {
-		if (cfg->virt) {
-			iounmap(cfg->virt + PCI_MMCFG_BUS_OFFSET(cfg->start_bus));
-			cfg->virt = NULL;
-		}
+	list_for_each_entry(cfg, &pci_mmcfg_list, list)
+		pci_mmcfg_arch_unmap(cfg);
+}
+
+int __devinit pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg)
+{
+	cfg->virt = mcfg_ioremap(cfg);
+	if (!cfg->virt) {
+		pr_err(PREFIX "can't map MMCONFIG at %pR\n", &cfg->res);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg)
+{
+	if (cfg && cfg->virt) {
+		iounmap(cfg->virt + PCI_MMCFG_BUS_OFFSET(cfg->start_bus));
+		cfg->virt = NULL;
 	}
 }

drivers/acpi/pci_root.c

@@ -505,6 +505,8 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
 	strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
 	device->driver_data = root;
 
+	root->mcfg_addr = acpi_pci_root_get_mcfg_addr(device->handle);
+
 	/*
 	 * All supported architectures that use ACPI have support for
 	 * PCI domains, so we indicate this in _OSC support capabilities.

drivers/pci/pci-acpi.c

@@ -162,6 +162,20 @@ acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
 	return remove_pm_notifier(dev, pci_acpi_wake_dev);
 }
 
+phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
+{
+	acpi_status status = AE_NOT_EXIST;
+	unsigned long long mcfg_addr;
+
+	if (handle)
+		status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
+					       NULL, &mcfg_addr);
+	if (ACPI_FAILURE(status))
+		return 0;
+
+	return (phys_addr_t)mcfg_addr;
+}
+
 /*
  * _SxD returns the D-state with the highest power
  * (lowest D-state number) supported in the S-state "x".

include/acpi/acnames.h

@@ -62,6 +62,7 @@
 #define METHOD_NAME__AEI        "_AEI"
 #define METHOD_NAME__PRW        "_PRW"
 #define METHOD_NAME__SRS        "_SRS"
+#define METHOD_NAME__CBA        "_CBA"
 
 /* Method names - these methods must appear at the namespace root */
 

include/acpi/acpi_bus.h

@@ -401,6 +401,7 @@ struct acpi_pci_root {
 
 	u32 osc_support_set;	/* _OSC state of support bits */
 	u32 osc_control_set;	/* _OSC state of control bits */
+	phys_addr_t mcfg_addr;
 };
 
 /* helper */

include/linux/pci-acpi.h

@@ -17,6 +17,7 @@ extern acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev);
 extern acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
 					     struct pci_dev *pci_dev);
 extern acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev);
+extern phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle);
 
 static inline acpi_handle acpi_find_root_bridge_handle(struct pci_dev *pdev)
 {

include/linux/sfi_acpi.h

@@ -66,7 +66,7 @@ extern int sfi_acpi_table_parse(char *signature, char *oem_id,
 				char *oem_table_id,
 				int (*handler)(struct acpi_table_header *));
 
-static inline int acpi_sfi_table_parse(char *signature,
+static inline int __init acpi_sfi_table_parse(char *signature,
 				int (*handler)(struct acpi_table_header *))
 {
 	if (!acpi_table_parse(signature, handler))
@@ -83,7 +83,7 @@ static inline int sfi_acpi_table_parse(char *signature, char *oem_id,
 	return -1;
 }
 
-static inline int acpi_sfi_table_parse(char *signature,
+static inline int __init acpi_sfi_table_parse(char *signature,
 				int (*handler)(struct acpi_table_header *))
 {
 	return acpi_table_parse(signature, handler);