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-rw-r--r--arch/powerpc/mm/slb.c73
1 files changed, 43 insertions, 30 deletions
diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index ff1811ac6c81..6c164cec9d2c 100644
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c
@@ -43,30 +43,37 @@ static void slb_allocate(unsigned long ea)
slb_allocate_realmode(ea);
}
-static inline unsigned long mk_esid_data(unsigned long ea, unsigned long slot)
+static inline unsigned long mk_esid_data(unsigned long ea, int ssize,
+ unsigned long slot)
{
- return (ea & ESID_MASK) | SLB_ESID_V | slot;
+ unsigned long mask;
+
+ mask = (ssize == MMU_SEGSIZE_256M)? ESID_MASK: ESID_MASK_1T;
+ return (ea & mask) | SLB_ESID_V | slot;
}
-static inline unsigned long mk_vsid_data(unsigned long ea, unsigned long flags)
+#define slb_vsid_shift(ssize) \
+ ((ssize) == MMU_SEGSIZE_256M? SLB_VSID_SHIFT: SLB_VSID_SHIFT_1T)
+
+static inline unsigned long mk_vsid_data(unsigned long ea, int ssize,
+ unsigned long flags)
{
- return (get_kernel_vsid(ea) << SLB_VSID_SHIFT) | flags;
+ return (get_kernel_vsid(ea, ssize) << slb_vsid_shift(ssize)) | flags |
+ ((unsigned long) ssize << SLB_VSID_SSIZE_SHIFT);
}
-static inline void slb_shadow_update(unsigned long ea,
+static inline void slb_shadow_update(unsigned long ea, int ssize,
unsigned long flags,
unsigned long entry)
{
/*
* Clear the ESID first so the entry is not valid while we are
- * updating it.
+ * updating it. No write barriers are needed here, provided
+ * we only update the current CPU's SLB shadow buffer.
*/
get_slb_shadow()->save_area[entry].esid = 0;
- 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();
+ get_slb_shadow()->save_area[entry].vsid = mk_vsid_data(ea, ssize, flags);
+ get_slb_shadow()->save_area[entry].esid = mk_esid_data(ea, ssize, entry);
}
static inline void slb_shadow_clear(unsigned long entry)
@@ -74,7 +81,8 @@ static inline void slb_shadow_clear(unsigned long entry)
get_slb_shadow()->save_area[entry].esid = 0;
}
-static inline void create_shadowed_slbe(unsigned long ea, unsigned long flags,
+static inline void create_shadowed_slbe(unsigned long ea, int ssize,
+ unsigned long flags,
unsigned long entry)
{
/*
@@ -82,11 +90,11 @@ 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(ea, flags, entry);
+ slb_shadow_update(ea, ssize, flags, entry);
asm volatile("slbmte %0,%1" :
- : "r" (mk_vsid_data(ea, flags)),
- "r" (mk_esid_data(ea, entry))
+ : "r" (mk_vsid_data(ea, ssize, flags)),
+ "r" (mk_esid_data(ea, ssize, entry))
: "memory" );
}
@@ -95,7 +103,7 @@ void slb_flush_and_rebolt(void)
/* If you change this make sure you change SLB_NUM_BOLTED
* appropriately too. */
unsigned long linear_llp, vmalloc_llp, lflags, vflags;
- unsigned long ksp_esid_data;
+ unsigned long ksp_esid_data, ksp_vsid_data;
WARN_ON(!irqs_disabled());
@@ -104,13 +112,15 @@ void slb_flush_and_rebolt(void)
lflags = SLB_VSID_KERNEL | linear_llp;
vflags = SLB_VSID_KERNEL | vmalloc_llp;
- ksp_esid_data = mk_esid_data(get_paca()->kstack, 2);
- if ((ksp_esid_data & ESID_MASK) == PAGE_OFFSET) {
+ ksp_esid_data = mk_esid_data(get_paca()->kstack, mmu_kernel_ssize, 2);
+ if ((ksp_esid_data & ~0xfffffffUL) <= PAGE_OFFSET) {
ksp_esid_data &= ~SLB_ESID_V;
+ ksp_vsid_data = 0;
slb_shadow_clear(2);
} else {
/* Update stack entry; others don't change */
- slb_shadow_update(get_paca()->kstack, lflags, 2);
+ slb_shadow_update(get_paca()->kstack, mmu_kernel_ssize, lflags, 2);
+ ksp_vsid_data = get_slb_shadow()->save_area[2].vsid;
}
/* We need to do this all in asm, so we're sure we don't touch
@@ -122,9 +132,9 @@ void slb_flush_and_rebolt(void)
/* Slot 2 - kernel stack */
"slbmte %2,%3\n"
"isync"
- :: "r"(mk_vsid_data(VMALLOC_START, vflags)),
- "r"(mk_esid_data(VMALLOC_START, 1)),
- "r"(mk_vsid_data(ksp_esid_data, lflags)),
+ :: "r"(mk_vsid_data(VMALLOC_START, mmu_kernel_ssize, vflags)),
+ "r"(mk_esid_data(VMALLOC_START, mmu_kernel_ssize, 1)),
+ "r"(ksp_vsid_data),
"r"(ksp_esid_data)
: "memory");
}
@@ -134,7 +144,7 @@ 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_shadow_update(VMALLOC_START, mmu_kernel_ssize, vflags, 1);
slb_flush_and_rebolt();
}
@@ -142,7 +152,7 @@ void slb_vmalloc_update(void)
void switch_slb(struct task_struct *tsk, struct mm_struct *mm)
{
unsigned long offset = get_paca()->slb_cache_ptr;
- unsigned long esid_data = 0;
+ unsigned long slbie_data = 0;
unsigned long pc = KSTK_EIP(tsk);
unsigned long stack = KSTK_ESP(tsk);
unsigned long unmapped_base;
@@ -151,9 +161,12 @@ void switch_slb(struct task_struct *tsk, struct mm_struct *mm)
int i;
asm volatile("isync" : : : "memory");
for (i = 0; i < offset; i++) {
- esid_data = ((unsigned long)get_paca()->slb_cache[i]
- << SID_SHIFT) | SLBIE_C;
- asm volatile("slbie %0" : : "r" (esid_data));
+ slbie_data = (unsigned long)get_paca()->slb_cache[i]
+ << SID_SHIFT; /* EA */
+ slbie_data |= user_segment_size(slbie_data)
+ << SLBIE_SSIZE_SHIFT;
+ slbie_data |= SLBIE_C; /* C set for user addresses */
+ asm volatile("slbie %0" : : "r" (slbie_data));
}
asm volatile("isync" : : : "memory");
} else {
@@ -162,7 +175,7 @@ void switch_slb(struct task_struct *tsk, struct mm_struct *mm)
/* Workaround POWER5 < DD2.1 issue */
if (offset == 1 || offset > SLB_CACHE_ENTRIES)
- asm volatile("slbie %0" : : "r" (esid_data));
+ asm volatile("slbie %0" : : "r" (slbie_data));
get_paca()->slb_cache_ptr = 0;
get_paca()->context = mm->context;
@@ -245,9 +258,9 @@ void slb_initialize(void)
asm volatile("isync":::"memory");
asm volatile("slbmte %0,%0"::"r" (0) : "memory");
asm volatile("isync; slbia; isync":::"memory");
- create_shadowed_slbe(PAGE_OFFSET, lflags, 0);
+ create_shadowed_slbe(PAGE_OFFSET, mmu_kernel_ssize, lflags, 0);
- create_shadowed_slbe(VMALLOC_START, vflags, 1);
+ create_shadowed_slbe(VMALLOC_START, mmu_kernel_ssize, vflags, 1);
/* We don't bolt the stack for the time being - we're in boot,
* so the stack is in the bolted segment. By the time it goes
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.