summaryrefslogtreecommitdiffstats
path: root/arch/i386/pci
diff options
context:
space:
mode:
authorAndi Kleen <ak@suse.de>2005-12-12 22:17:10 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-12-12 22:31:16 -0800
commit928cf8c62763349efc550a12f6518e52c3390906 (patch)
tree5fb257cbdaaebc3814e6df85100712127cdb8526 /arch/i386/pci
parentbf5421c309bb89e5106452bc840983b1b4754d61 (diff)
downloadop-kernel-dev-928cf8c62763349efc550a12f6518e52c3390906.zip
op-kernel-dev-928cf8c62763349efc550a12f6518e52c3390906.tar.gz
[PATCH] i386/x86-64 Fall back to type 1 access when no entry found
When there is no entry for a bus in MCFG fall back to type1. This is especially important on K8 systems where always some devices can't be accessed using mmconfig (in particular the builtin northbridge doesn't support it for its own devices) Cc: <gregkh@suse.de> Cc: <jgarzik@pobox.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/pci')
-rw-r--r--arch/i386/pci/direct.c4
-rw-r--r--arch/i386/pci/mmconfig.c24
-rw-r--r--arch/i386/pci/pci.h7
3 files changed, 25 insertions, 10 deletions
diff --git a/arch/i386/pci/direct.c b/arch/i386/pci/direct.c
index 94331d6..e3ac502 100644
--- a/arch/i386/pci/direct.c
+++ b/arch/i386/pci/direct.c
@@ -13,7 +13,7 @@
#define PCI_CONF1_ADDRESS(bus, devfn, reg) \
(0x80000000 | (bus << 16) | (devfn << 8) | (reg & ~3))
-static int pci_conf1_read(unsigned int seg, unsigned int bus,
+int pci_conf1_read(unsigned int seg, unsigned int bus,
unsigned int devfn, int reg, int len, u32 *value)
{
unsigned long flags;
@@ -42,7 +42,7 @@ static int pci_conf1_read(unsigned int seg, unsigned int bus,
return 0;
}
-static int pci_conf1_write(unsigned int seg, unsigned int bus,
+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/i386/pci/mmconfig.c b/arch/i386/pci/mmconfig.c
index dfbf80c..cc787a7 100644
--- a/arch/i386/pci/mmconfig.c
+++ b/arch/i386/pci/mmconfig.c
@@ -30,10 +30,8 @@ static u32 get_base_addr(unsigned int seg, int bus)
while (1) {
++cfg_num;
if (cfg_num >= pci_mmcfg_config_num) {
- /* something bad is going on, no cfg table is found. */
- /* so we fall back to the old way we used to do this */
- /* and just rely on the first entry to be correct. */
- return pci_mmcfg_config[0].base_address;
+ /* Not found - fallback to type 1 */
+ return 0;
}
cfg = &pci_mmcfg_config[cfg_num];
if (cfg->pci_segment_group_number != seg)
@@ -44,9 +42,9 @@ static u32 get_base_addr(unsigned int seg, int bus)
}
}
-static inline void pci_exp_set_dev_base(unsigned int seg, int bus, int devfn)
+static inline void pci_exp_set_dev_base(unsigned int base, int bus, int devfn)
{
- u32 dev_base = get_base_addr(seg, bus) | (bus << 20) | (devfn << 12);
+ u32 dev_base = base | (bus << 20) | (devfn << 12);
if (dev_base != mmcfg_last_accessed_device) {
mmcfg_last_accessed_device = dev_base;
set_fixmap_nocache(FIX_PCIE_MCFG, dev_base);
@@ -57,13 +55,18 @@ static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
unsigned int devfn, int reg, int len, u32 *value)
{
unsigned long flags;
+ u32 base;
if (!value || (bus > 255) || (devfn > 255) || (reg > 4095))
return -EINVAL;
+ base = get_base_addr(seg, bus);
+ if (!base)
+ return pci_conf1_read(seg,bus,devfn,reg,len,value);
+
spin_lock_irqsave(&pci_config_lock, flags);
- pci_exp_set_dev_base(seg, bus, devfn);
+ pci_exp_set_dev_base(base, bus, devfn);
switch (len) {
case 1:
@@ -86,13 +89,18 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
unsigned int devfn, int reg, int len, u32 value)
{
unsigned long flags;
+ u32 base;
if ((bus > 255) || (devfn > 255) || (reg > 4095))
return -EINVAL;
+ base = get_base_addr(seg, bus);
+ if (!base)
+ return pci_conf1_write(seg,bus,devfn,reg,len,value);
+
spin_lock_irqsave(&pci_config_lock, flags);
- pci_exp_set_dev_base(seg, bus, devfn);
+ pci_exp_set_dev_base(base, bus, devfn);
switch (len) {
case 1:
diff --git a/arch/i386/pci/pci.h b/arch/i386/pci/pci.h
index 127d53a..f550781 100644
--- a/arch/i386/pci/pci.h
+++ b/arch/i386/pci/pci.h
@@ -74,3 +74,10 @@ 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);
+
+
OpenPOWER on IntegriCloud