[MIPS] local_r4k_flush_cache_page fix

    
If dcache_size != icache_size or dcache_size != scache_size, or
set-associative cache, icache/scache does not flushed properly.  Make
blast_?cache_page_indexed() masks its index value correctly.  Also,
use physical address for physically indexed pcache/scache.
    
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

5 files changed, 15 insertions, 6 deletions

diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index 0668e9bfce41..9572ed44f0d5 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -375,6 +375,7 @@ static void r4k_flush_cache_mm(struct mm_struct *mm)
 struct flush_cache_page_args {
         struct vm_area_struct *vma;
         unsigned long addr;
+        unsigned long pfn;
 };
 
 static inline void local_r4k_flush_cache_page(void *args)
@@ -382,6 +383,7 @@ static inline void local_r4k_flush_cache_page(void *args)
         struct flush_cache_page_args *fcp_args = args;
         struct vm_area_struct *vma = fcp_args->vma;
         unsigned long addr = fcp_args->addr;
+        unsigned long paddr = fcp_args->pfn << PAGE_SHIFT;
         int exec = vma->vm_flags & VM_EXEC;
         struct mm_struct *mm = vma->vm_mm;
         pgd_t *pgdp;
@@ -431,11 +433,12 @@ static inline void local_r4k_flush_cache_page(void *args)
          * Do indexed flush, too much work to get the (possible) TLB refills
          * to work correctly.
          */
-        addr = INDEX_BASE + (addr & (dcache_size - 1));
         if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
-                r4k_blast_dcache_page_indexed(addr);
-                if (exec && !cpu_icache_snoops_remote_store)
-                        r4k_blast_scache_page_indexed(addr);
+                r4k_blast_dcache_page_indexed(cpu_has_pindexed_dcache ?
+                                              paddr : addr);
+                if (exec && !cpu_icache_snoops_remote_store) {
+                        r4k_blast_scache_page_indexed(paddr);
+                }
         }
         if (exec) {
                 if (cpu_has_vtag_icache) {
@@ -455,6 +458,7 @@ static void r4k_flush_cache_page(struct vm_area_struct *vma,
 
         args.vma = vma;
         args.addr = addr;
+        args.pfn = pfn;
 
         on_each_cpu(local_r4k_flush_cache_page, &args, 1, 1);
 }
@@ -956,6 +960,7 @@ static void __init probe_pcache(void)
         switch (c->cputype) {
         case CPU_20KC:
         case CPU_25KF:
+                c->dcache.flags |= MIPS_CACHE_PINDEX;
         case CPU_R10000:
         case CPU_R12000:
         case CPU_SB1:
diff --git a/arch/mips/mm/c-tx39.c b/arch/mips/mm/c-tx39.c
index 7c572bea4a98..fe232e3988e3 100644
--- a/arch/mips/mm/c-tx39.c
+++ b/arch/mips/mm/c-tx39.c
@@ -210,7 +210,6 @@ static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page
          * Do indexed flush, too much work to get the (possible) TLB refills
          * to work correctly.
          */
-        page = (KSEG0 + (page & (dcache_size - 1)));
         if (cpu_has_dc_aliases || exec)
                 tx39_blast_dcache_page_indexed(page);
         if (exec)
diff --git a/include/asm-mips/cpu-features.h b/include/asm-mips/cpu-features.h
index 78c9cc2735d5..3f2b6d9ac45e 100644
--- a/include/asm-mips/cpu-features.h
+++ b/include/asm-mips/cpu-features.h
@@ -96,6 +96,9 @@
 #ifndef cpu_has_ic_fills_f_dc
 #define cpu_has_ic_fills_f_dc   (cpu_data[0].icache.flags & MIPS_CACHE_IC_F_DC)
 #endif
+#ifndef cpu_has_pindexed_dcache
+#define cpu_has_pindexed_dcache (cpu_data[0].dcache.flags & MIPS_CACHE_PINDEX)
+#endif
 
 /*
  * I-Cache snoops remote store.  This only matters on SMP.  Some multiprocessors
diff --git a/include/asm-mips/cpu-info.h b/include/asm-mips/cpu-info.h
index d5cf519f8fcc..140be1c67da7 100644
--- a/include/asm-mips/cpu-info.h
+++ b/include/asm-mips/cpu-info.h
@@ -39,6 +39,7 @@ struct cache_desc {
 #define MIPS_CACHE_ALIASES      0x00000004      /* Cache could have aliases */
 #define MIPS_CACHE_IC_F_DC      0x00000008      /* Ic can refill from D-cache */
 #define MIPS_IC_SNOOPS_REMOTE   0x00000010      /* Ic snoops remote stores */
+#define MIPS_CACHE_PINDEX       0x00000020      /* Physically indexed cache */
 
 struct cpuinfo_mips {
         unsigned long           udelay_val;
diff --git a/include/asm-mips/r4kcache.h b/include/asm-mips/r4kcache.h
index 9632c27dad15..0bcb79a58ee9 100644
--- a/include/asm-mips/r4kcache.h
+++ b/include/asm-mips/r4kcache.h
@@ -257,7 +257,8 @@ static inline void blast_##pfx##cache##lsize##_page(unsigned long page)	\
                                                                         \
 static inline void blast_##pfx##cache##lsize##_page_indexed(unsigned long page) \
 {                                                                       \
-        unsigned long start = page;                                     \
+        unsigned long indexmask = current_cpu_data.desc.waysize - 1;    \
+        unsigned long start = INDEX_BASE + (page & indexmask);          \
         unsigned long end = start + PAGE_SIZE;                          \
         unsigned long ws_inc = 1UL << current_cpu_data.desc.waybit;     \
         unsigned long ws_end = current_cpu_data.desc.ways <<            \