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authorLen Brown <len.brown@intel.com>2011-01-07 01:46:40 +0100
committerLen Brown <len.brown@intel.com>2011-01-07 01:04:19 -0500
commit6d5bbf00d251cc73223a71422d69e069dc2e0b8d (patch)
tree78088b56bbc95caff8cfa574941710e0c065b596 /drivers/acpi
parentca9b600be38c73b7d25acfb8b7e4e9a9e941d881 (diff)
downloadop-kernel-dev-6d5bbf00d251cc73223a71422d69e069dc2e0b8d.zip
op-kernel-dev-6d5bbf00d251cc73223a71422d69e069dc2e0b8d.tar.gz
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>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/osl.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 055d7b7..3a7b487 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;
}
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