diff options
| author | Len Brown <len.brown@intel.com> | 2011-01-07 01:46:40 +0100 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2011-01-07 01:04:19 -0500 |
| commit | 6d5bbf00d251cc73223a71422d69e069dc2e0b8d (patch) | |
| tree | 78088b56bbc95caff8cfa574941710e0c065b596 | |
| parent | ca9b600be38c73b7d25acfb8b7e4e9a9e941d881 (diff) | |
| download | linux-6d5bbf00d251cc73223a71422d69e069dc2e0b8d.tar.bz2 | |
ACPI: Use ioremap_cache()
Although the temporary boot-time ACPI table mappings
were set up with CPU caching enabled, the permanent table
mappings and AML run-time region memory accesses were
set up with ioremap(), which on x86 is a synonym for
ioremap_nocache().
Changing this to ioremap_cache() improves performance as
seen when accessing the tables via acpidump,
or /sys/firmware/acpi/tables. It should also improve
AML run-time performance.
No change on ia64.
Reported-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
| -rw-r--r-- | arch/ia64/include/asm/io.h | 5 | ||||
| -rw-r--r-- | drivers/acpi/osl.c | 6 |
2 files changed, 8 insertions, 3 deletions
diff --git a/arch/ia64/include/asm/io.h b/arch/ia64/include/asm/io.h index cc8335eb3110..e5a6c3530c6c 100644 --- a/arch/ia64/include/asm/io.h +++ b/arch/ia64/include/asm/io.h @@ -426,6 +426,11 @@ extern void __iomem * ioremap_nocache (unsigned long offset, unsigned long size) extern void iounmap (volatile void __iomem *addr); extern void __iomem * early_ioremap (unsigned long phys_addr, unsigned long size); extern void early_iounmap (volatile void __iomem *addr, unsigned long size); +static inline void __iomem * ioremap_cache (unsigned long phys_addr, unsigned long size) +{ + return ioremap(phys_addr, size); +} + /* * String version of IO memory access ops: diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index 055d7b701fff..3a7b4879fd99 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -320,7 +320,7 @@ acpi_os_map_memory(acpi_physical_address phys, acpi_size size) pg_off = round_down(phys, PAGE_SIZE); pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off; - virt = ioremap(pg_off, pg_sz); + virt = ioremap_cache(pg_off, pg_sz); if (!virt) { kfree(map); return NULL; @@ -642,7 +642,7 @@ acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width) virt_addr = acpi_map_vaddr_lookup(phys_addr, size); rcu_read_unlock(); if (!virt_addr) { - virt_addr = ioremap(phys_addr, size); + virt_addr = ioremap_cache(phys_addr, size); unmap = 1; } if (!value) @@ -678,7 +678,7 @@ acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width) virt_addr = acpi_map_vaddr_lookup(phys_addr, size); rcu_read_unlock(); if (!virt_addr) { - virt_addr = ioremap(phys_addr, size); + virt_addr = ioremap_cache(phys_addr, size); unmap = 1; } |