From faed197b7b44a6c4e6b81dd2db649fd452b0a7ef Mon Sep 17 00:00:00 2001 From: OGAWA Hirofumi Date: Tue, 13 Feb 2007 13:26:20 +0100 Subject: [PATCH] [PATCH] mmconfig: Fix x86_64 ioremap base_address Current mmconfig has some problems of remapped range. a) In the case of broken MCFG tables on Asus etc., we need to remap 256M range, but currently only remap 1M. b) The base address always corresponds to bus number 0, but currently we are assuming it corresponds to start bus number. This patch fixes the above problems. (akpm: Arjan suggests that if the MCFG table is broken we just shouldn't use it, rather than try to work around things). Signed-off-by: OGAWA Hirofumi Signed-off-by: Andi Kleen Cc: Arjan van de Ven Cc: Andi Kleen Signed-off-by: Andrew Morton --- arch/x86_64/pci/mmconfig.c | 46 +++++++++++++++++++++++++++++--------- 1 file changed, 35 insertions(+), 11 deletions(-) diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c index 0847735bb3..8e05449660 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; -- 2.39.5