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Subject[PATCH] ACPI: use ioremap_cache()
From: Len Brown <len.brown@intel.com>

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>
---
arch/ia64/include/asm/io.h | 5 +++++
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 cc8335e..009a7e0 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(unsigned long phys_addr, unsigned long size);
+}
+

/*
* String version of IO memory access ops:
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 966fedd..85eba53 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -324,7 +324,7 @@ 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;
@@ -646,7 +646,7 @@ 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)
@@ -682,7 +682,7 @@ 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;
}

--
1.7.3.3.557.gb5c17



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