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OGAWA Hirofumi 8d1c481960 [PATCH] arch/i386/pci/mmconfig.c tlb flush fix ... We use the fixmap for accessing pci config space in pci_mmcfg_read/write(). The problem is in pci_exp_set_dev_base(). It is caching a last accessed address to avoid calling set_fixmap_nocache() whenever pci_mmcfg_read/write() is used. static inline void pci_exp_set_dev_base(int bus, int devfn) { 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); } } cpu0 cpu1 --------------------------------------------------------------------------- pci_mmcfg_read("device-A") pci_exp_set_dev_base() set_fixmap_nocache() pci_mmcfg_read("device-B") pci_exp_set_dev_base() set_fixmap_nocache() pci_mmcfg_read("device-B") pci_exp_set_dev_base() /* doesn't flush tlb */ But if cpus accessed the above order, the second pci_mmcfg_read() on cpu0 doesn't flush the TLB, because "mmcfg_last_accessed_device" is device-B. So, second pci_mmcfg_read() on cpu0 accesses a device-A via a previous TLB cache. This problem became the cause of several strange behavior. This patches fixes this situation by adds "mmcfg_last_accessed_cpu" check. [ Alternatively, we could make a per-cpu mapping area or something. Not that it's probably worth it, but if we wanted to avoid all locking and instead just disable preemption, that would be the way to go. --Linus ] Signed-off-by: OGAWA Hirofumi <hogawa@miraclelinux.com> Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		18 years ago
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boot	[PATCH] x86-64: Fix numaq build error	18 years ago
crypto	…
kernel	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6	18 years ago
lib	…
mach-default	…
mach-es7000	…
mach-generic	[PATCH] i386: Avoid boot warning with apic=debug	18 years ago
mach-visws	[PATCH] visws: sgivwfb as module needs exports	18 years ago
mach-voyager	[PATCH] i386: replace kmalloc+memset with kzalloc	18 years ago
math-emu	…
mm	[PATCH] memory hotplug: fix compile error for i386 with NUMA config	18 years ago
oprofile	…
pci	[PATCH] arch/i386/pci/mmconfig.c tlb flush fix	18 years ago
power	Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6	18 years ago
Kconfig	[PATCH] x86-64: no paravirt for X86_VOYAGER or X86_VISWS	18 years ago
Kconfig.cpu	[PATCH] LOG2: Implement a general integer log2 facility in the kernel	18 years ago
Kconfig.debug	[PATCH] paravirt: Patch inline replacements for paravirt intercepts	18 years ago
Makefile	[PATCH] i386: always enable regparm	18 years ago
Makefile.cpu	[PATCH] i386: Add support for compilation for Core2	18 years ago
defconfig	Remove stack unwinder for now	18 years ago