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authorKumar Gala <galak@kernel.crashing.org>2009-10-17 03:48:40 +0400
committerKumar Gala <galak@kernel.crashing.org>2010-10-14 09:55:14 +0400
commit55fd766b5fad8240b7a6e994b5779a46d28f73d4 (patch)
treed00d9ddd5fb635d083e573d68675115489c46f19
parent988cf86d4f0da4150e808300c145ba87c0aad02f (diff)
downloadlinux-55fd766b5fad8240b7a6e994b5779a46d28f73d4.tar.xz
powerpc/fsl-booke64: Use TLB CAMs to cover linear mapping on FSL 64-bit chips
On Freescale parts typically have TLB array for large mappings that we can bolt the linear mapping into. We utilize the code that already exists on PPC32 on the 64-bit side to setup the linear mapping to be cover by bolted TLB entries. We utilize a quarter of the variable size TLB array for this purpose. Additionally, we limit the amount of memory to what we can cover via bolted entries so we don't get secondary faults in the TLB miss handlers. We should fix this limitation in the future. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
-rw-r--r--arch/powerpc/kernel/asm-offsets.c4
-rw-r--r--arch/powerpc/mm/Makefile2
-rw-r--r--arch/powerpc/mm/fsl_booke_mmu.c12
-rw-r--r--arch/powerpc/mm/mmu_decl.h5
-rw-r--r--arch/powerpc/mm/tlb_nohash.c14
-rw-r--r--arch/powerpc/mm/tlb_nohash_low.S2
6 files changed, 29 insertions, 10 deletions
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index c63494090854..c3e01945ad4f 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -61,7 +61,7 @@
#endif
#endif
-#if defined(CONFIG_FSL_BOOKE)
+#if defined(CONFIG_PPC_FSL_BOOK3E)
#include "../mm/mmu_decl.h"
#endif
@@ -470,7 +470,7 @@ int main(void)
DEFINE(PGD_T_LOG2, PGD_T_LOG2);
DEFINE(PTE_T_LOG2, PTE_T_LOG2);
#endif
-#ifdef CONFIG_FSL_BOOKE
+#ifdef CONFIG_PPC_FSL_BOOK3E
DEFINE(TLBCAM_SIZE, sizeof(struct tlbcam));
DEFINE(TLBCAM_MAS0, offsetof(struct tlbcam, MAS0));
DEFINE(TLBCAM_MAS1, offsetof(struct tlbcam, MAS1));
diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
index 53102f306880..bdca46e08382 100644
--- a/arch/powerpc/mm/Makefile
+++ b/arch/powerpc/mm/Makefile
@@ -23,7 +23,7 @@ obj-$(CONFIG_PPC_STD_MMU) += hash_low_$(CONFIG_WORD_SIZE).o \
mmu_context_hash$(CONFIG_WORD_SIZE).o
obj-$(CONFIG_40x) += 40x_mmu.o
obj-$(CONFIG_44x) += 44x_mmu.o
-obj-$(CONFIG_FSL_BOOKE) += fsl_booke_mmu.o
+obj-$(CONFIG_PPC_FSL_BOOK3E) += fsl_booke_mmu.o
obj-$(CONFIG_NEED_MULTIPLE_NODES) += numa.o
obj-$(CONFIG_PPC_MM_SLICES) += slice.o
ifeq ($(CONFIG_HUGETLB_PAGE),y)
diff --git a/arch/powerpc/mm/fsl_booke_mmu.c b/arch/powerpc/mm/fsl_booke_mmu.c
index 1b4354db51bb..67bc8a7c7e0b 100644
--- a/arch/powerpc/mm/fsl_booke_mmu.c
+++ b/arch/powerpc/mm/fsl_booke_mmu.c
@@ -56,11 +56,6 @@
unsigned int tlbcam_index;
-
-#if defined(CONFIG_LOWMEM_CAM_NUM_BOOL) && (CONFIG_LOWMEM_CAM_NUM >= NUM_TLBCAMS)
-#error "LOWMEM_CAM_NUM must be less than NUM_TLBCAMS"
-#endif
-
#define NUM_TLBCAMS (64)
struct tlbcam TLBCAM[NUM_TLBCAMS];
@@ -185,6 +180,12 @@ unsigned long map_mem_in_cams(unsigned long ram, int max_cam_idx)
return amount_mapped;
}
+#ifdef CONFIG_PPC32
+
+#if defined(CONFIG_LOWMEM_CAM_NUM_BOOL) && (CONFIG_LOWMEM_CAM_NUM >= NUM_TLBCAMS)
+#error "LOWMEM_CAM_NUM must be less than NUM_TLBCAMS"
+#endif
+
unsigned long __init mmu_mapin_ram(unsigned long top)
{
return tlbcam_addrs[tlbcam_index - 1].limit - PAGE_OFFSET + 1;
@@ -216,3 +217,4 @@ void __init adjust_total_lowmem(void)
__initial_memory_limit_addr = memstart_addr + __max_low_memory;
}
+#endif
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index 63b84a0d3b10..dd0a2589591d 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -140,10 +140,13 @@ extern void wii_memory_fixups(void);
extern void MMU_init_hw(void);
extern unsigned long mmu_mapin_ram(unsigned long top);
-#elif defined(CONFIG_FSL_BOOKE)
+#elif defined(CONFIG_PPC_FSL_BOOK3E)
+extern unsigned long map_mem_in_cams(unsigned long ram, int max_cam_idx);
+#ifdef CONFIG_PPC32
extern void MMU_init_hw(void);
extern unsigned long mmu_mapin_ram(unsigned long top);
extern void adjust_total_lowmem(void);
+#endif
extern void loadcam_entry(unsigned int index);
struct tlbcam {
diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c
index 665189920762..61fe32a256da 100644
--- a/arch/powerpc/mm/tlb_nohash.c
+++ b/arch/powerpc/mm/tlb_nohash.c
@@ -541,6 +541,20 @@ static void __early_init_mmu(int boot_cpu)
*/
linear_map_top = memblock_end_of_DRAM();
+#ifdef CONFIG_PPC_FSL_BOOK3E
+ if (mmu_has_feature(MMU_FTR_TYPE_FSL_E)) {
+ unsigned int num_cams;
+
+ /* use a quarter of the TLBCAM for bolted linear map */
+ num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
+ linear_map_top = map_mem_in_cams(linear_map_top, num_cams);
+
+ /* limit memory so we dont have linear faults */
+ memblock_enforce_memory_limit(linear_map_top);
+ memblock_analyze();
+ }
+#endif
+
/* A sync won't hurt us after mucking around with
* the MMU configuration
*/
diff --git a/arch/powerpc/mm/tlb_nohash_low.S b/arch/powerpc/mm/tlb_nohash_low.S
index b9d9fed8f36e..af405eefe48d 100644
--- a/arch/powerpc/mm/tlb_nohash_low.S
+++ b/arch/powerpc/mm/tlb_nohash_low.S
@@ -367,7 +367,7 @@ _GLOBAL(set_context)
#error Unsupported processor type !
#endif
-#if defined(CONFIG_FSL_BOOKE)
+#if defined(CONFIG_PPC_FSL_BOOK3E)
/*
* extern void loadcam_entry(unsigned int index)
*