From: Jiang Liu <jiang.liu@xxxxxxxxxx>
This patch enhances pci_root driver to update MMCFG information when
hot-plugging PCI root bridges on x86 platforms.
Signed-off-by: Jiang Liu <liuj97@xxxxxxxxx>
---
arch/x86/include/asm/pci_x86.h | 1 +
arch/x86/pci/acpi.c | 57 ++++++++++++++++++++++++++++++++++++++++
arch/x86/pci/mmconfig_32.c | 2 +-
arch/x86/pci/mmconfig_64.c | 2 +-
drivers/acpi/pci_root.c | 22 ++++++++++++++++
include/acpi/acnames.h | 1 +
include/acpi/acpi_bus.h | 1 +
include/linux/pci-acpi.h | 4 +++
8 files changed, 88 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index 3252c97..5e1d9a6 100644
--- a/arch/x86/include/asm/pci_x86.h
+++ b/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;
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index da0149d..80cc3fa 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -4,6 +4,7 @@
#include <linux/irq.h>
#include <linux/dmi.h>
#include <linux/slab.h>
+#include <linux/pci-acpi.h>
#include <asm/numa.h>
#include <asm/pci_x86.h>
@@ -488,6 +489,62 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
return bus;
}
+int __devinit arch_acpi_pci_root_add(struct acpi_pci_root *root,
+ unsigned long long base_addr)
+{
+ int result;
+
+ /* 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)) {
+ /* still could use raw_pci_ops for devices on segment 0 */
+ if (root->segment == 0)
+ return 0;
+
+ printk(KERN_ERR "MMCFG is disabled, "
+ "can't access CFG space for Bus %04x:%02x\n",
+ root->segment, (unsigned int)root->secondary.start);
+ return -ENODEV;
+ }
+
+ result = pci_mmconfig_insert(root->segment, root->secondary.start,
+ root->secondary.end, base_addr);
+ if (result == -EEXIST) {
+ /* return success if MMCFG item already exists */
+ result = 0;
+ } else if (result == 0) {
+ /* enable MMCFG if it hasn't been enabled yet */
+ if (raw_pci_ext_ops == NULL)
+ raw_pci_ext_ops = &pci_mmcfg;
+ root->mmconf_added = true;
+ } else if (root->segment == 0 && raw_pci_ext_ops == NULL &&
+ raw_pci_ops != NULL) {
+ /*
+ * system doesn't support extended configuration space,
+ * still could use raw_pci_ops with it
+ */
+ result = 0;
+ } else {
+ printk(KERN_ERR
+ "can't add MMCFG information for Bus %04x:%02x\n",
+ root->segment, (unsigned int)root->secondary.start);
+ }
+
+ return result;
+}
+
+void arch_acpi_pci_root_remove(struct acpi_pci_root *root)
+{
+ if (root->mmconf_added) {
+ pci_mmconfig_delete(root->segment,
+ root->secondary.start,
+ root->secondary.end);
+ root->mmconf_added = false;
+ }
+}
+
int __init pci_acpi_init(void)
{
struct pci_dev *dev = NULL;
diff --git a/arch/x86/pci/mmconfig_32.c b/arch/x86/pci/mmconfig_32.c
index a22785d..db63ac2 100644
--- a/arch/x86/pci/mmconfig_32.c
+++ b/arch/x86/pci/mmconfig_32.c
@@ -126,7 +126,7 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
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,
};
diff --git a/arch/x86/pci/mmconfig_64.c b/arch/x86/pci/mmconfig_64.c
index 4e05779..34c08dd 100644
--- a/arch/x86/pci/mmconfig_64.c
+++ b/arch/x86/pci/mmconfig_64.c
@@ -90,7 +90,7 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
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,
};
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index b313125..8d3f821 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -448,6 +448,16 @@ out:
}
EXPORT_SYMBOL(acpi_pci_osc_control_set);
+int __weak arch_acpi_pci_root_add(struct acpi_pci_root *root,
+ unsigned long long base_addr)
+{
+ return 0;
+}
+
+void __weak arch_acpi_pci_root_remove(struct acpi_pci_root *root)
+{
+}
+
static int __devinit acpi_pci_root_add(struct acpi_device *device)
{
unsigned long long segment, bus;
@@ -457,6 +467,7 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
acpi_handle handle;
struct acpi_device *child;
u32 flags, base_flags;
+ unsigned long long base_addr;
root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
if (!root)
@@ -504,6 +515,15 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
device->driver_data = root;
+ status = acpi_evaluate_integer(root->device->handle, METHOD_NAME__CBA,
+ NULL, &base_addr);
+ if (ACPI_FAILURE(status))
+ base_addr = 0;
+ if (arch_acpi_pci_root_add(root, base_addr)) {
+ result = -ENODEV;
+ goto out_free;
+ }
+
/*
* All supported architectures that use ACPI have support for
* PCI domains, so we indicate this in _OSC support capabilities.
@@ -629,6 +649,7 @@ out_del_root:
list_del_rcu(&root->node);
mutex_unlock(&acpi_pci_root_lock);
synchronize_rcu();
+ arch_acpi_pci_root_remove(root);
out_free:
kfree(root);
return result;
@@ -686,6 +707,7 @@ out:
list_del_rcu(&root->node);
mutex_unlock(&acpi_pci_root_lock);
synchronize_rcu();
+ arch_acpi_pci_root_remove(root);
kfree(root);
return 0;
diff --git a/include/acpi/acnames.h b/include/acpi/acnames.h
index 38f5088..99bda75 100644
--- a/include/acpi/acnames.h
+++ b/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 */
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 333d38c..4171277 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -371,6 +371,7 @@ struct acpi_pci_root {
u32 osc_support_set; /* _OSC state of support bits */
u32 osc_control_set; /* _OSC state of control bits */
bool hot_added;
+ bool mmconf_added;
};
/* helper */
diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h
index 4462350..d017dc0 100644
--- a/include/linux/pci-acpi.h
+++ b/include/linux/pci-acpi.h
@@ -18,6 +18,10 @@ 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);
+int arch_acpi_pci_root_add(struct acpi_pci_root *root,
+ unsigned long long base_addr);
+void arch_acpi_pci_root_remove(struct acpi_pci_root *root);
+
static inline acpi_handle acpi_find_root_bridge_handle(struct pci_dev *pdev)
{
struct pci_bus *pbus = pdev->bus;
--
1.7.9.5
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