From: Ohad Sharabi Date: Sun, 10 Apr 2022 08:19:42 +0000 (+0300) Subject: habanalabs: add prefetch flag to the MAP operation X-Git-Tag: v5.19-rc1~45^2~19 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=5d1a0de2c778f369970dd50f6713e95068926a8b;p=thirdparty%2Fkernel%2Flinux.git habanalabs: add prefetch flag to the MAP operation This patch let the user decide whether the translations done in the page tables will be fetched directly to the STLB right after the map. We want to let the user control whether to perform prefetch upon map operation. To do so a memory flag was added, to be used in the MAP ioctl, called HL_MEM_PREFETCH and if set- the mappings will be fetched directly to the STLB after map operation. Signed-off-by: Ohad Sharabi Reviewed-by: Oded Gabbay Signed-off-by: Oded Gabbay Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c index 326c2179628f7..6face45c57e35 100644 --- a/drivers/misc/habanalabs/common/memory.c +++ b/drivers/misc/habanalabs/common/memory.c @@ -1250,11 +1250,12 @@ static int map_device_va(struct hl_ctx *ctx, struct hl_mem_in *args, if (rc) goto map_err; - /* already prefetch the relevant translations to the cache */ - rc = hl_mmu_prefetch_cache_range(hdev, *vm_type, ctx->asid, ret_vaddr, - phys_pg_pack->total_size); - if (rc) - goto map_err; + if (args->flags & HL_MEM_PREFETCH) { + rc = hl_mmu_prefetch_cache_range(hdev, *vm_type, ctx->asid, ret_vaddr, + phys_pg_pack->total_size); + if (rc) + goto map_err; + } mutex_unlock(&ctx->mmu_lock); diff --git a/include/uapi/misc/habanalabs.h b/include/uapi/misc/habanalabs.h index ca2af5f980567..3576bf2b4841b 100644 --- a/include/uapi/misc/habanalabs.h +++ b/include/uapi/misc/habanalabs.h @@ -1134,6 +1134,7 @@ union hl_wait_cs_args { #define HL_MEM_SHARED 0x2 #define HL_MEM_USERPTR 0x4 #define HL_MEM_FORCE_HINT 0x8 +#define HL_MEM_PREFETCH 0x40 /** * structure hl_mem_in - structure that handle input args for memory IOCTL