MIPS: Export some tlbex internals for KVM to use

Export to TLB exception code generating functions so that KVM can
construct a fast TLB refill handler for guest context without
reinventing the wheel quite so much.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org

diff --git a/arch/mips/include/asm/tlbex.h b/arch/mips/include/asm/tlbex.h
new file mode 100644 (file)
index 0000000..53050e9
--- /dev/null
+++ b/arch/mips/include/asm/tlbex.h
@@ -0,0 +1,26 @@
+#ifndef __ASM_TLBEX_H
+#define __ASM_TLBEX_H
+
+#include <asm/uasm.h>
+
+/*
+ * Write random or indexed TLB entry, and care about the hazards from
+ * the preceding mtc0 and for the following eret.
+ */
+enum tlb_write_entry {
+       tlb_random,
+       tlb_indexed
+};
+
+extern int pgd_reg;
+
+void build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
+                     unsigned int tmp, unsigned int ptr);
+void build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr);
+void build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr);
+void build_update_entries(u32 **p, unsigned int tmp, unsigned int ptep);
+void build_tlb_write_entry(u32 **p, struct uasm_label **l,
+                          struct uasm_reloc **r,
+                          enum tlb_write_entry wmode);
+
+#endif /* __ASM_TLBEX_H */

diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index dc7bb1506103cfef33b8f310c2e756dbbbc9b0cf..2465f83c79c3b8a229b01753d837e8742d9d6531 100644 (file)
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -35,6 +35,7 @@
 #include <asm/war.h>
 #include <asm/uasm.h>
 #include <asm/setup.h>
+#include <asm/tlbex.h>
 
 static int mips_xpa_disabled;
 
@@ -345,7 +346,8 @@ static int allocate_kscratch(void)
 }
 
 static int scratch_reg;
-static int pgd_reg;
+int pgd_reg;
+EXPORT_SYMBOL_GPL(pgd_reg);
 enum vmalloc64_mode {not_refill, refill_scratch, refill_noscratch};
 
 static struct work_registers build_get_work_registers(u32 **p)
@@ -497,15 +499,9 @@ static void __maybe_unused build_tlb_probe_entry(u32 **p)
        }
 }
 
-/*
- * Write random or indexed TLB entry, and care about the hazards from
- * the preceding mtc0 and for the following eret.
- */
-enum tlb_write_entry { tlb_random, tlb_indexed };
-
-static void build_tlb_write_entry(u32 **p, struct uasm_label **l,
-                                 struct uasm_reloc **r,
-                                 enum tlb_write_entry wmode)
+void build_tlb_write_entry(u32 **p, struct uasm_label **l,
+                          struct uasm_reloc **r,
+                          enum tlb_write_entry wmode)
 {
        void(*tlbw)(u32 **) = NULL;
 
@@ -628,6 +624,7 @@ static void build_tlb_write_entry(u32 **p, struct uasm_label **l,
                break;
        }
 }
+EXPORT_SYMBOL_GPL(build_tlb_write_entry);
 
 static __maybe_unused void build_convert_pte_to_entrylo(u32 **p,
                                                        unsigned int reg)
@@ -782,9 +779,8 @@ static void build_huge_handler_tail(u32 **p, struct uasm_reloc **r,
  * TMP and PTR are scratch.
  * TMP will be clobbered, PTR will hold the pmd entry.
  */
-static void
-build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
-                unsigned int tmp, unsigned int ptr)
+void build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
+                     unsigned int tmp, unsigned int ptr)
 {
 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
        long pgdc = (long)pgd_current;
@@ -860,6 +856,7 @@ build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
        uasm_i_daddu(p, ptr, ptr, tmp); /* add in pmd offset */
 #endif
 }
+EXPORT_SYMBOL_GPL(build_get_pmde64);
 
 /*
  * BVADDR is the faulting address, PTR is scratch.
@@ -935,8 +932,7 @@ build_get_pgd_vmalloc64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
  * TMP and PTR are scratch.
  * TMP will be clobbered, PTR will hold the pgd entry.
  */
-static void __maybe_unused
-build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr)
+void build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr)
 {
        if (pgd_reg != -1) {
                /* pgd is in pgd_reg */
@@ -961,6 +957,7 @@ build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr)
        uasm_i_sll(p, tmp, tmp, PGD_T_LOG2);
        uasm_i_addu(p, ptr, ptr, tmp); /* add in pgd offset */
 }
+EXPORT_SYMBOL_GPL(build_get_pgde32);
 
 #endif /* !CONFIG_64BIT */
 
@@ -990,7 +987,7 @@ static void build_adjust_context(u32 **p, unsigned int ctx)
        uasm_i_andi(p, ctx, ctx, mask);
 }
 
-static void build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr)
+void build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr)
 {
        /*
         * Bug workaround for the Nevada. It seems as if under certain
@@ -1014,8 +1011,9 @@ static void build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr)
        build_adjust_context(p, tmp);
        UASM_i_ADDU(p, ptr, ptr, tmp); /* add in offset */
 }
+EXPORT_SYMBOL_GPL(build_get_ptep);
 
-static void build_update_entries(u32 **p, unsigned int tmp, unsigned int ptep)
+void build_update_entries(u32 **p, unsigned int tmp, unsigned int ptep)
 {
        int pte_off_even = 0;
        int pte_off_odd = sizeof(pte_t);
@@ -1064,6 +1062,7 @@ static void build_update_entries(u32 **p, unsigned int tmp, unsigned int ptep)
                UASM_i_MTC0(p, 0, C0_ENTRYLO1);
        UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */
 }
+EXPORT_SYMBOL_GPL(build_update_entries);
 
 struct mips_huge_tlb_info {
        int huge_pte;