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authorMichael Neuling <mikey@neuling.org>2007-08-03 11:55:39 +1000
committerPaul Mackerras <paulus@samba.org>2007-08-03 19:36:01 +1000
commit67439b76f29cb278bb3412fc873b980fc65110c9 (patch)
treed70c627453d429f63c777769f5596184c001fe39 /arch
parent5628244059976009151d41c2798855290753d8d5 (diff)
[POWERPC] Fixes for the SLB shadow buffer code
On a machine with hardware 64kB pages and a kernel configured for a 64kB base page size, we need to change the vmalloc segment from 64kB pages to 4kB pages if some driver creates a non-cacheable mapping in the vmalloc area. However, we never updated with SLB shadow buffer. This fixes it. Thanks to paulus for finding this. Also added some write barriers to ensure the shadow buffer contents are always consistent. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/entry_64.S3
-rw-r--r--arch/powerpc/mm/hash_utils_64.c2
-rw-r--r--arch/powerpc/mm/slb.c28
3 files changed, 22 insertions, 11 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 9ef28da2c7f..952eba6701f 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -389,8 +389,11 @@ BEGIN_FTR_SECTION
ld r9,PACA_SLBSHADOWPTR(r13)
li r12,0
std r12,SLBSHADOW_STACKESID(r9) /* Clear ESID */
+ eieio
std r7,SLBSHADOW_STACKVSID(r9) /* Save VSID */
+ eieio
std r0,SLBSHADOW_STACKESID(r9) /* Save ESID */
+ eieio
slbie r6
slbie r6 /* Workaround POWER5 < DD2.1 issue */
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index bc7b0cedae5..f1789578747 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -759,7 +759,7 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
mmu_psize_defs[mmu_vmalloc_psize].sllp) {
get_paca()->vmalloc_sllp =
mmu_psize_defs[mmu_vmalloc_psize].sllp;
- slb_flush_and_rebolt();
+ slb_vmalloc_update();
}
#endif /* CONFIG_PPC_64K_PAGES */
diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index 304375a7357..b0697017d0e 100644
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c
@@ -53,7 +53,8 @@ static inline unsigned long mk_vsid_data(unsigned long ea, unsigned long flags)
return (get_kernel_vsid(ea) << SLB_VSID_SHIFT) | flags;
}
-static inline void slb_shadow_update(unsigned long esid, unsigned long vsid,
+static inline void slb_shadow_update(unsigned long ea,
+ unsigned long flags,
unsigned long entry)
{
/*
@@ -61,11 +62,11 @@ static inline void slb_shadow_update(unsigned long esid, unsigned long vsid,
* updating it.
*/
get_slb_shadow()->save_area[entry].esid = 0;
- barrier();
- get_slb_shadow()->save_area[entry].vsid = vsid;
- barrier();
- get_slb_shadow()->save_area[entry].esid = esid;
-
+ smp_wmb();
+ get_slb_shadow()->save_area[entry].vsid = mk_vsid_data(ea, flags);
+ smp_wmb();
+ get_slb_shadow()->save_area[entry].esid = mk_esid_data(ea, entry);
+ smp_wmb();
}
static inline void create_shadowed_slbe(unsigned long ea, unsigned long flags,
@@ -76,8 +77,7 @@ static inline void create_shadowed_slbe(unsigned long ea, unsigned long flags,
* we don't get a stale entry here if we get preempted by PHYP
* between these two statements.
*/
- slb_shadow_update(mk_esid_data(ea, entry), mk_vsid_data(ea, flags),
- entry);
+ slb_shadow_update(ea, flags, entry);
asm volatile("slbmte %0,%1" :
: "r" (mk_vsid_data(ea, flags)),
@@ -104,8 +104,7 @@ void slb_flush_and_rebolt(void)
ksp_esid_data &= ~SLB_ESID_V;
/* Only third entry (stack) may change here so only resave that */
- slb_shadow_update(ksp_esid_data,
- mk_vsid_data(ksp_esid_data, lflags), 2);
+ slb_shadow_update(get_paca()->kstack, lflags, 2);
/* We need to do this all in asm, so we're sure we don't touch
* the stack between the slbia and rebolting it. */
@@ -123,6 +122,15 @@ void slb_flush_and_rebolt(void)
: "memory");
}
+void slb_vmalloc_update(void)
+{
+ unsigned long vflags;
+
+ vflags = SLB_VSID_KERNEL | mmu_psize_defs[mmu_vmalloc_psize].sllp;
+ slb_shadow_update(VMALLOC_START, vflags, 1);
+ slb_flush_and_rebolt();
+}
+
/* Flush all user entries from the segment table of the current processor. */
void switch_slb(struct task_struct *tsk, struct mm_struct *mm)
{