Commit-ID: df65c1bcd9b7b639177a5a15da1b8dc3bee4f5fa
Gitweb: http://git.kernel.org/tip/df65c1bcd9b7b639177a5a15da1b8dc3bee4f5fa
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Thu, 16 Mar 2017 22:50:07 +0100
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Wed, 28 Jun 2017 22:32:56 +0200
x86/PCI: Select CONFIG_PCI_LOCKLESS_CONFIG
All x86 PCI configuration space accessors have either their own
serialization or can operate completely lockless (ECAM).
Disable the global lock in the generic PCI configuration space accessors.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Bjorn Helgaas <helgaas@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: linux-pci@xxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20170316215057.295079391@xxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
arch/x86/Kconfig | 1 +
arch/x86/pci/common.c | 4 ++--
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0efb4c9..0652c9f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -166,6 +166,7 @@ config X86
select HAVE_UNSTABLE_SCHED_CLOCK
select HAVE_USER_RETURN_NOTIFIER
select IRQ_FORCED_THREADING
+ select PCI_LOCKLESS_CONFIG
select PERF_EVENTS
select RTC_LIB
select RTC_MC146818_LIB
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 190e718..cfd1a89 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -75,8 +75,8 @@ struct pci_ops pci_root_ops = {
};
/*
- * This interrupt-safe spinlock protects all accesses to PCI
- * configuration space.
+ * This interrupt-safe spinlock protects all accesses to PCI configuration
+ * space, except for the mmconfig (ECAM) based operations.
*/
DEFINE_RAW_SPINLOCK(pci_config_lock);
--
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