[PATCH v6 18/23] powerpc/e500: Don't pre-check write access on data TLB error
From: Christophe Leroy <hidden>
Date: 2024-06-24 14:47:53
Also in:
linux-mm, lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
Don't pre-check write access on read-only pages on data TLB error. Load the TLB anyway and take a DSI exception when it happens. This avoids reading SPRN_ESR at every data TLB error exception. Signed-off-by: Christophe Leroy <redacted> --- v5: New --- arch/powerpc/kernel/head_85xx.S | 15 --------------- 1 file changed, 15 deletions(-)
diff --git a/arch/powerpc/kernel/head_85xx.S b/arch/powerpc/kernel/head_85xx.S
index a305244afc9f..282e49c51deb 100644
--- a/arch/powerpc/kernel/head_85xx.S
+++ b/arch/powerpc/kernel/head_85xx.S@@ -472,27 +472,12 @@ END_BTB_FLUSH_SECTION #endif 4: - /* Mask of required permission bits. Note that while we - * do copy ESR:ST to _PAGE_WRITE position as trying to write - * to an RO page is pretty common, we don't do it with - * _PAGE_DIRTY. We could do it, but it's a fairly rare - * event so I'd rather take the overhead when it happens - * rather than adding an instruction here. We should measure - * whether the whole thing is worth it in the first place - * as we could avoid loading SPRN_ESR completely in the first - * place... - * - * TODO: Is it worth doing that mfspr & rlwimi in the first - * place or can we save a couple of instructions here ? - */ - mfspr r12,SPRN_ESR #ifdef CONFIG_PTE_64BIT li r13,_PAGE_PRESENT|_PAGE_BAP_SR oris r13,r13,_PAGE_ACCESSED@h #else li r13,_PAGE_PRESENT|_PAGE_READ|_PAGE_ACCESSED #endif - rlwimi r13,r12,11,29,29 FIND_PTE andc. r13,r13,r11 /* Check permission */
--
2.44.0