powerpc/64/kexec: Fix MMU cleanup on radix

[karo-tx-linux.git] / arch / powerpc / include / asm / mmu.h

diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
index 54471228f7b8f5c3517b59ab9e7e46a54644442d..79c989a05aa1c2c513d832fbd9aef7ddc4b00fc0 100644 (file)
--- a/arch/powerpc/include/asm/mmu.h
+++ b/arch/powerpc/include/asm/mmu.h
@@ -12,7 +12,7 @@
  */
 
 /*
- * First half is MMU families
+ * MMU families
  */
 #define MMU_FTR_HPTE_TABLE             ASM_CONST(0x00000001)
 #define MMU_FTR_TYPE_8xx               ASM_CONST(0x00000002)
@@ -21,9 +21,13 @@
 #define MMU_FTR_TYPE_FSL_E             ASM_CONST(0x00000010)
 #define MMU_FTR_TYPE_47x               ASM_CONST(0x00000020)
 
+/* Radix page table supported and enabled */
+#define MMU_FTR_TYPE_RADIX             ASM_CONST(0x00000040)
+
 /*
- * This is individual features
+ * Individual features below.
  */
+
 /*
  * We need to clear top 16bits of va (from the remaining 64 bits )in
  * tlbie* instructions
@@ -93,11 +97,6 @@
  */
 #define MMU_FTR_1T_SEGMENT             ASM_CONST(0x40000000)
 
-/*
- * Radix page table available
- */
-#define MMU_FTR_RADIX                  ASM_CONST(0x80000000)
-
 /* MMU feature bit sets for various CPUs */
 #define MMU_FTRS_DEFAULT_HPTE_ARCH_V2  \
        MMU_FTR_HPTE_TABLE | MMU_FTR_PPCAS_ARCH_V2
@@ -113,6 +112,7 @@
 #define MMU_FTRS_PA6T          MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \
                                MMU_FTR_CI_LARGE_PAGE | MMU_FTR_NO_SLBIE_B
 #ifndef __ASSEMBLY__
+#include <linux/bug.h>
 #include <asm/cputable.h>
 
 #ifdef CONFIG_PPC_FSL_BOOK3E
@@ -131,20 +131,71 @@ enum {
                MMU_FTR_LOCKLESS_TLBIE | MMU_FTR_CI_LARGE_PAGE |
                MMU_FTR_1T_SEGMENT | MMU_FTR_TLBIE_CROP_VA |
 #ifdef CONFIG_PPC_RADIX_MMU
-               MMU_FTR_RADIX |
+               MMU_FTR_TYPE_RADIX |
 #endif
                0,
 };
 
-static inline int mmu_has_feature(unsigned long feature)
+static inline bool early_mmu_has_feature(unsigned long feature)
+{
+       return !!(MMU_FTRS_POSSIBLE & cur_cpu_spec->mmu_features & feature);
+}
+
+#ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS
+#include <linux/jump_label.h>
+
+#define NUM_MMU_FTR_KEYS       32
+
+extern struct static_key_true mmu_feature_keys[NUM_MMU_FTR_KEYS];
+
+extern void mmu_feature_keys_init(void);
+
+static __always_inline bool mmu_has_feature(unsigned long feature)
+{
+       int i;
+
+       BUILD_BUG_ON(!__builtin_constant_p(feature));
+
+#ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
+       if (!static_key_initialized) {
+               printk("Warning! mmu_has_feature() used prior to jump label init!\n");
+               dump_stack();
+               return early_mmu_has_feature(feature);
+       }
+#endif
+
+       if (!(MMU_FTRS_POSSIBLE & feature))
+               return false;
+
+       i = __builtin_ctzl(feature);
+       return static_branch_likely(&mmu_feature_keys[i]);
+}
+
+static inline void mmu_clear_feature(unsigned long feature)
+{
+       int i;
+
+       i = __builtin_ctzl(feature);
+       cur_cpu_spec->mmu_features &= ~feature;
+       static_branch_disable(&mmu_feature_keys[i]);
+}
+#else
+
+static inline void mmu_feature_keys_init(void)
+{
+
+}
+
+static inline bool mmu_has_feature(unsigned long feature)
 {
-       return (MMU_FTRS_POSSIBLE & cur_cpu_spec->mmu_features & feature);
+       return early_mmu_has_feature(feature);
 }
 
 static inline void mmu_clear_feature(unsigned long feature)
 {
        cur_cpu_spec->mmu_features &= ~feature;
 }
+#endif /* CONFIG_JUMP_LABEL */
 
 extern unsigned int __start___mmu_ftr_fixup, __stop___mmu_ftr_fixup;
 
@@ -153,6 +204,10 @@ extern unsigned int __start___mmu_ftr_fixup, __stop___mmu_ftr_fixup;
  * make it match the size our of bolted TLB area
  */
 extern u64 ppc64_rma_size;
+
+/* Cleanup function used by kexec */
+extern void mmu_cleanup_all(void);
+extern void radix__mmu_cleanup_all(void);
 #endif /* CONFIG_PPC64 */
 
 struct mm_struct;
@@ -164,6 +219,28 @@ static inline void assert_pte_locked(struct mm_struct *mm, unsigned long addr)
 }
 #endif /* !CONFIG_DEBUG_VM */
 
+#ifdef CONFIG_PPC_RADIX_MMU
+static inline bool radix_enabled(void)
+{
+       return mmu_has_feature(MMU_FTR_TYPE_RADIX);
+}
+
+static inline bool early_radix_enabled(void)
+{
+       return early_mmu_has_feature(MMU_FTR_TYPE_RADIX);
+}
+#else
+static inline bool radix_enabled(void)
+{
+       return false;
+}
+
+static inline bool early_radix_enabled(void)
+{
+       return false;
+}
+#endif
+
 #endif /* !__ASSEMBLY__ */
 
 /* The kernel use the constants below to index in the page sizes array.
@@ -210,6 +287,7 @@ extern void early_init_mmu(void);
 extern void early_init_mmu_secondary(void);
 extern void setup_initial_memory_limit(phys_addr_t first_memblock_base,
                                       phys_addr_t first_memblock_size);
+static inline void mmu_early_init_devtree(void) { }
 #endif /* __ASSEMBLY__ */
 #endif
 
@@ -230,9 +308,5 @@ extern void setup_initial_memory_limit(phys_addr_t first_memblock_base,
 #  include <asm/mmu-8xx.h>
 #endif
 
-#ifndef radix_enabled
-#define radix_enabled() (0)
-#endif
-
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_MMU_H_ */