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authorJack Steiner <steiner@sgi.com>2009-11-19 14:23:41 -0600
committerIngo Molnar <mingo@elte.hu>2009-11-23 19:47:42 +0100
commitfd12a0d69aee6d90fa9b9890db24368a897f8423 (patch)
tree2e77b6badae3966af54beb40f727dea143dbb075 /arch/x86
parente38e2af1c57c3eb5211331a5b4fcaae0c4a2a918 (diff)
x86: UV SGI: Don't track GRU space in PAT
GRU space is always mapped as WB in the page table. There is no need to track the mappings in the PAT. This also eliminates the "freeing invalid memtype" messages when the GRU space is unmapped. Signed-off-by: Jack Steiner <steiner@sgi.com> LKML-Reference: <20091119202341.GA4420@sgi.com> [ v2: fix build failure ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/include/asm/pat.h2
-rw-r--r--arch/x86/include/asm/x86_init.h2
-rw-r--r--arch/x86/kernel/apic/x2apic_uv_x.c19
-rw-r--r--arch/x86/kernel/x86_init.c2
-rw-r--r--arch/x86/mm/pat.c12
5 files changed, 33 insertions, 4 deletions
diff --git a/arch/x86/include/asm/pat.h b/arch/x86/include/asm/pat.h
index e2c1668dde7..4c35dd016b5 100644
--- a/arch/x86/include/asm/pat.h
+++ b/arch/x86/include/asm/pat.h
@@ -24,4 +24,6 @@ int io_reserve_memtype(resource_size_t start, resource_size_t end,
void io_free_memtype(resource_size_t start, resource_size_t end);
+int default_is_untracked_pat_range(u64 start, u64 end);
+
#endif /* _ASM_X86_PAT_H */
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index 2c756fd4ab0..8112ed78628 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -113,11 +113,13 @@ struct x86_cpuinit_ops {
/**
* struct x86_platform_ops - platform specific runtime functions
+ * @is_untracked_pat_range exclude from PAT logic
* @calibrate_tsc: calibrate TSC
* @get_wallclock: get time from HW clock like RTC etc.
* @set_wallclock: set time back to HW clock
*/
struct x86_platform_ops {
+ int (*is_untracked_pat_range)(u64 start, u64 end);
unsigned long (*calibrate_tsc)(void);
unsigned long (*get_wallclock)(void);
int (*set_wallclock)(unsigned long nowtime);
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index f5f5886a6b5..2477c9f8809 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -30,10 +30,22 @@
#include <asm/apic.h>
#include <asm/ipi.h>
#include <asm/smp.h>
+#include <asm/x86_init.h>
DEFINE_PER_CPU(int, x2apic_extra_bits);
static enum uv_system_type uv_system_type;
+static u64 gru_start_paddr, gru_end_paddr;
+
+static int is_GRU_range(u64 start, u64 end)
+{
+ return start >= gru_start_paddr && end < gru_end_paddr;
+}
+
+static int uv_is_untracked_pat_range(u64 start, u64 end)
+{
+ return is_ISA_range(start, end) || is_GRU_range(start, end);
+}
static int early_get_nodeid(void)
{
@@ -49,6 +61,7 @@ static int early_get_nodeid(void)
static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
if (!strcmp(oem_id, "SGI")) {
+ x86_platform.is_untracked_pat_range = uv_is_untracked_pat_range;
if (!strcmp(oem_table_id, "UVL"))
uv_system_type = UV_LEGACY_APIC;
else if (!strcmp(oem_table_id, "UVX"))
@@ -385,8 +398,12 @@ static __init void map_gru_high(int max_pnode)
int shift = UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR_BASE_SHFT;
gru.v = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR);
- if (gru.s.enable)
+ if (gru.s.enable) {
map_high("GRU", gru.s.base, shift, max_pnode, map_wb);
+ gru_start_paddr = ((u64)gru.s.base << shift);
+ gru_end_paddr = gru_start_paddr + (1UL << shift) * (max_pnode + 1);
+
+ }
}
static __init void map_mmr_high(int max_pnode)
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 4449a4a2c2e..bcc749ef62d 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -13,6 +13,7 @@
#include <asm/e820.h>
#include <asm/time.h>
#include <asm/irq.h>
+#include <asm/pat.h>
#include <asm/tsc.h>
void __cpuinit x86_init_noop(void) { }
@@ -69,6 +70,7 @@ struct x86_cpuinit_ops x86_cpuinit __cpuinitdata = {
};
struct x86_platform_ops x86_platform = {
+ .is_untracked_pat_range = default_is_untracked_pat_range,
.calibrate_tsc = native_calibrate_tsc,
.get_wallclock = mach_get_cmos_time,
.set_wallclock = mach_set_rtc_mmss,
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index e78cd0ec2bc..38a66ef9426 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -20,6 +20,7 @@
#include <asm/cacheflush.h>
#include <asm/processor.h>
#include <asm/tlbflush.h>
+#include <asm/x86_init.h>
#include <asm/pgtable.h>
#include <asm/fcntl.h>
#include <asm/e820.h>
@@ -348,6 +349,11 @@ static int free_ram_pages_type(u64 start, u64 end)
return 0;
}
+int default_is_untracked_pat_range(u64 start, u64 end)
+{
+ return is_ISA_range(start, end);
+}
+
/*
* req_type typically has one of the:
* - _PAGE_CACHE_WB
@@ -388,7 +394,7 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
}
/* Low ISA region is always mapped WB in page table. No need to track */
- if (is_ISA_range(start, end - 1)) {
+ if (x86_platform.is_untracked_pat_range(start, end - 1)) {
if (new_type)
*new_type = _PAGE_CACHE_WB;
return 0;
@@ -499,7 +505,7 @@ int free_memtype(u64 start, u64 end)
return 0;
/* Low ISA region is always mapped WB. No need to track */
- if (is_ISA_range(start, end - 1))
+ if (x86_platform.is_untracked_pat_range(start, end - 1))
return 0;
is_range_ram = pat_pagerange_is_ram(start, end);
@@ -582,7 +588,7 @@ static unsigned long lookup_memtype(u64 paddr)
int rettype = _PAGE_CACHE_WB;
struct memtype *entry;
- if (is_ISA_range(paddr, paddr + PAGE_SIZE - 1))
+ if (x86_platform.is_untracked_pat_range(paddr, paddr + PAGE_SIZE - 1))
return rettype;
if (pat_pagerange_is_ram(paddr, paddr + PAGE_SIZE)) {