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-rw-r--r--arch/x86_64/pci/mmconfig.c46
1 files changed, 35 insertions, 11 deletions
diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c
index 0847735bb31..8e05449660f 100644
--- a/arch/x86_64/pci/mmconfig.c
+++ b/arch/x86_64/pci/mmconfig.c
@@ -28,6 +28,39 @@ struct mmcfg_virt {
};
static struct mmcfg_virt *pci_mmcfg_virt;
+static inline int mcfg_broken(void)
+{
+ struct acpi_mcfg_allocation *cfg = &pci_mmcfg_config[0];
+
+ /* Handle more broken MCFG tables on Asus etc.
+ They only contain a single entry for bus 0-0. Assume
+ this applies to all busses. */
+ if (pci_mmcfg_config_num == 1 &&
+ cfg->pci_segment_group_number == 0 &&
+ (cfg->start_bus_number | cfg->end_bus_number) == 0)
+ return 1;
+ return 0;
+}
+
+static void __iomem *mcfg_ioremap(struct acpi_mcfg_allocation *cfg)
+{
+ void __iomem *addr;
+ u32 size;
+
+ if (mcfg_broken())
+ size = 256 << 20;
+ else
+ size = (cfg->end_bus_number + 1) << 20;
+
+ addr = ioremap_nocache(cfg->base_address, size);
+ if (addr) {
+ printk(KERN_INFO "PCI: Using MMCONFIG at %x - %x\n",
+ cfg->base_address,
+ cfg->base_address + size - 1);
+ }
+ return addr;
+}
+
static char __iomem *get_virt(unsigned int seg, unsigned bus)
{
int cfg_num = -1;
@@ -45,13 +78,7 @@ static char __iomem *get_virt(unsigned int seg, unsigned bus)
return pci_mmcfg_virt[cfg_num].virt;
}
- /* Handle more broken MCFG tables on Asus etc.
- They only contain a single entry for bus 0-0. Assume
- this applies to all busses. */
- cfg = &pci_mmcfg_config[0];
- if (pci_mmcfg_config_num == 1 &&
- cfg->pci_segment == 0 &&
- (cfg->start_bus_number | cfg->end_bus_number) == 0)
+ if (mcfg_broken())
return pci_mmcfg_virt[0].virt;
/* Fall back to type 0 */
@@ -145,16 +172,13 @@ int __init pci_mmcfg_arch_init(void)
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].address,
- MMCONFIG_APER_MAX);
+ pci_mmcfg_virt[i].virt = mcfg_ioremap(&pci_mmcfg_config[i]);
if (!pci_mmcfg_virt[i].virt) {
printk(KERN_ERR "PCI: Cannot map mmconfig aperture for "
"segment %d\n",
pci_mmcfg_config[i].pci_segment);
return 0;
}
- printk(KERN_INFO "PCI: Using MMCONFIG at %Lx\n",
- pci_mmcfg_config[i].address);
}
raw_pci_ops = &pci_mmcfg;
return 1;