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[PATCH] mmconfig: Reject a broken MCFG tables on Asus etc

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This rejects broken MCFG tables on Asus. When the table
looks bogus just disable mmconfig

Arjan and Andi suggested this.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
OGAWA Hirofumi 2007-02-13 13:26:20 +01:00 committed by Andi Kleen
parent faed197b7b
commit 44de0203fa
3 changed files with 37 additions and 46 deletions
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24
arch/i386/pci/mmconfig-shared.c
View File

@ -197,6 +197,26 @@ static __init void pci_mmcfg_insert_resources(void)
}
}
static void __init pci_mmcfg_reject_broken(void)
{
typeof(pci_mmcfg_config[0]) *cfg = &pci_mmcfg_config[0];
/*
* Handle more broken MCFG tables on Asus etc.
* They only contain a single entry for bus 0-0.
*/
if (pci_mmcfg_config_num == 1 &&
cfg->pci_segment == 0 &&
(cfg->start_bus_number | cfg->end_bus_number) == 0) {
kfree(pci_mmcfg_config);
pci_mmcfg_config = NULL;
pci_mmcfg_config_num = 0;
printk(KERN_ERR "PCI: start and end of bus number is 0. "
"Rejected as broken MCFG.");
}
}
void __init pci_mmcfg_init(int type)
{
int known_bridge = 0;
@ -207,8 +227,10 @@ void __init pci_mmcfg_init(int type)
if (type == 1 && pci_mmcfg_check_hostbridge())
known_bridge = 1;
if (!known_bridge)
if (!known_bridge) {
acpi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
pci_mmcfg_reject_broken();
}
if ((pci_mmcfg_config_num == 0) ||
(pci_mmcfg_config == NULL) ||

9
arch/i386/pci/mmconfig.c
View File

@ -47,15 +47,6 @@ static u32 get_base_addr(unsigned int seg, int bus, unsigned devfn)
return cfg->address;
}
/* 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)
return cfg->address;
/* Fall back to type 0 */
return 0;
}

50
arch/x86_64/pci/mmconfig.c
View File

@ -28,39 +28,6 @@ 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;
@ -78,9 +45,6 @@ static char __iomem *get_virt(unsigned int seg, unsigned bus)
return pci_mmcfg_virt[cfg_num].virt;
}
if (mcfg_broken())
return pci_mmcfg_virt[0].virt;
/* Fall back to type 0 */
return NULL;
}
@ -160,6 +124,20 @@ static struct pci_raw_ops pci_mmcfg = {
.write = pci_mmcfg_write,
};
static void __iomem * __init mcfg_ioremap(struct acpi_mcfg_allocation *cfg)
{
void __iomem *addr;
u32 size;
size = (cfg->end_bus_number + 1) << 20;
addr = ioremap_nocache(cfg->address, size);
if (addr) {
printk(KERN_INFO "PCI: Using MMCONFIG at %Lx - %Lx\n",
cfg->address, cfg->address + size - 1);
}
return addr;
}
int __init pci_mmcfg_arch_init(void)
{
int i;