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authorGreg Kroah-Hartman <gregkh@suse.de>2005-06-23 17:35:56 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2005-06-27 21:52:48 -0700
commit1cde8a16815bd85c8137d1ea556398983c597c11 (patch)
treec43ab735f7fd96d0576dfb7749c8ded74f9b63b7
parentd57e26ceb7dbf44cd08128cb6146116d4281b58b (diff)
[PATCH] PCI: use the MCFG table to properly access pci devices (x86-64)
Now that we have access to the whole MCFG table, let's properly use it for all pci device accesses (as that's what it is there for, some boxes don't put all the busses into one entry.) If, for some reason, the table is incorrect, we fallback to the "old style" of mmconfig accesses, namely, we just assume the first entry in the table is the one for us, and blindly use it. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--arch/x86_64/pci/mmconfig.c58
1 files changed, 48 insertions, 10 deletions
diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c
index 09cfcc1234b..657e88aa090 100644
--- a/arch/x86_64/pci/mmconfig.c
+++ b/arch/x86_64/pci/mmconfig.c
@@ -13,17 +13,44 @@
#define MMCONFIG_APER_SIZE (256*1024*1024)
/* Static virtual mapping of the MMCONFIG aperture */
-static char *pci_mmcfg_virt;
+struct mmcfg_virt {
+ struct acpi_table_mcfg_config *cfg;
+ char *virt;
+};
+static struct mmcfg_virt *pci_mmcfg_virt;
-static inline char *pci_dev_base(unsigned int bus, unsigned int devfn)
+static char *get_virt(unsigned int seg, int bus)
{
- return pci_mmcfg_virt + ((bus << 20) | (devfn << 12));
+ int cfg_num = -1;
+ struct acpi_table_mcfg_config *cfg;
+
+ 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_virt[0].virt;
+ }
+ cfg = pci_mmcfg_virt[cfg_num].cfg;
+ if (cfg->pci_segment_group_number != seg)
+ continue;
+ if ((cfg->start_bus_number <= bus) &&
+ (cfg->end_bus_number >= bus))
+ return pci_mmcfg_virt[cfg_num].virt;
+ }
+}
+
+static inline char *pci_dev_base(unsigned int seg, unsigned int bus, unsigned int devfn)
+{
+
+ return get_virt(seg, bus) + ((bus << 20) | (devfn << 12));
}
static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
unsigned int devfn, int reg, int len, u32 *value)
{
- char *addr = pci_dev_base(bus, devfn);
+ char *addr = pci_dev_base(seg, bus, devfn);
if (unlikely(!value || (bus > 255) || (devfn > 255) || (reg > 4095)))
return -EINVAL;
@@ -46,7 +73,7 @@ static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
unsigned int devfn, int reg, int len, u32 value)
{
- char *addr = pci_dev_base(bus,devfn);
+ char *addr = pci_dev_base(seg, bus, devfn);
if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095)))
return -EINVAL;
@@ -73,6 +100,8 @@ static struct pci_raw_ops pci_mmcfg = {
static int __init pci_mmcfg_init(void)
{
+ int i;
+
if ((pci_probe & PCI_PROBE_MMCONF) == 0)
return 0;
@@ -90,13 +119,22 @@ static int __init pci_mmcfg_init(void)
return 0;
/* RED-PEN i386 doesn't do _nocache right now */
- pci_mmcfg_virt = ioremap_nocache(pci_mmcfg_config[0].base_address, MMCONFIG_APER_SIZE);
- if (!pci_mmcfg_virt) {
- printk("PCI: Cannot map mmconfig aperture\n");
+ pci_mmcfg_virt = kmalloc(sizeof(*pci_mmcfg_virt) * pci_mmcfg_config_num, GFP_KERNEL);
+ if (pci_mmcfg_virt == NULL) {
+ printk("PCI: Can not allocate memory for mmconfig structures\n");
return 0;
- }
+ }
+ for (i = 0; i < pci_mmcfg_config_num; ++i) {
+ pci_mmcfg_virt[i].cfg = &pci_mmcfg_config[i];
+ pci_mmcfg_virt[i].virt = ioremap_nocache(pci_mmcfg_config[i].base_address, MMCONFIG_APER_SIZE);
+ if (!pci_mmcfg_virt[i].virt) {
+ printk("PCI: Cannot map mmconfig aperture for segment %d\n",
+ pci_mmcfg_config[i].pci_segment_group_number);
+ return 0;
+ }
+ printk(KERN_INFO "PCI: Using MMCONFIG at %x\n", pci_mmcfg_config[i].base_address);
+ }
- printk(KERN_INFO "PCI: Using MMCONFIG at %x\n", pci_mmcfg_config[0].base_address);
raw_pci_ops = &pci_mmcfg;
pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;