powerpc/8xx: Move DTLB perf handling closer.

Now that space have been freed next to the DTLB miss handler,
it's associated DTLB perf handling can be brought back in
the same place.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/97f48cc1a2ea6b895bfac0752cbe59deaf2eecda.1589866984.git.christophe.leroy@csgroup.eu

diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index fb5d171..9f3f7f3 100644 (file)
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -344,6 +344,17 @@ DataStoreTLBMiss:
        rfi
        patch_site      0b, patch__dtlbmiss_exit_1
 
+#ifdef CONFIG_PERF_EVENTS
+       patch_site      0f, patch__dtlbmiss_perf
+0:     lwz     r10, (dtlb_miss_counter - PAGE_OFFSET)@l(0)
+       addi    r10, r10, 1
+       stw     r10, (dtlb_miss_counter - PAGE_OFFSET)@l(0)
+       mfspr   r10, SPRN_DAR
+       mtspr   SPRN_DAR, r11   /* Tag DAR */
+       mfspr   r11, SPRN_M_TW
+       rfi
+#endif
+
 /* This is an instruction TLB error on the MPC8xx.  This could be due
  * to many reasons, such as executing guarded memory or illegal instruction
  * addresses.  There is nothing to do but handle a big time error fault.
@@ -390,18 +401,6 @@ DARFixed:/* Return from dcbx instruction bug workaround */
        /* 0x300 is DataAccess exception, needed by bad_page_fault() */
        EXC_XFER_LITE(0x300, handle_page_fault)
 
-/* Called from DataStoreTLBMiss when perf TLB misses events are activated */
-#ifdef CONFIG_PERF_EVENTS
-       patch_site      0f, patch__dtlbmiss_perf
-0:     lwz     r10, (dtlb_miss_counter - PAGE_OFFSET)@l(0)
-       addi    r10, r10, 1
-       stw     r10, (dtlb_miss_counter - PAGE_OFFSET)@l(0)
-       mfspr   r10, SPRN_DAR
-       mtspr   SPRN_DAR, r11   /* Tag DAR */
-       mfspr   r11, SPRN_M_TW
-       rfi
-#endif
-
 stack_overflow:
        vmap_stack_overflow_exception