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| author | Thomas Gleixner <tglx@linutronix.de> | 2017-03-16 22:50:06 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-06-28 22:32:56 +0200 |
| commit | 714fe383d6c9bd95d0d2cad8cbeff3688342d025 (patch) | |
| tree | 183bc2a1007b91839c7e29ebaefc29dd8ca68984 /drivers/pci/Kconfig | |
| parent | x86/PCI/ce4100: Properly lock accessor functions (diff) | |
| download | linux-714fe383d6c9bd95d0d2cad8cbeff3688342d025.tar.xz linux-714fe383d6c9bd95d0d2cad8cbeff3688342d025.zip | |
PCI: Provide Kconfig option for lockless config space accessors
The generic PCI configuration space accessors are globally serialized via
pci_lock. On larger systems this causes massive lock contention when the
configuration space has to be accessed frequently. One such access pattern
is the Intel Uncore performance counter unit.
Provide a kernel config option which can be selected by an architecture
when the low level PCI configuration space accessors in the architecture
use their own serialization or can operate completely lockless.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Bjorn Helgaas <helgaas@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: linux-pci@vger.kernel.org
Link: http://lkml.kernel.org/r/20170316215057.205961140@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/pci/Kconfig')
| -rw-r--r-- | drivers/pci/Kconfig | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index e0cacb7b8563..c32a77fc8b03 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -86,6 +86,9 @@ config PCI_ATS config PCI_ECAM bool +config PCI_LOCKLESS_CONFIG + bool + config PCI_IOV bool "PCI IOV support" depends on PCI |