From: Lucas Stach <l.stach@pengutronix.de>
Date: Thu, 6 Jan 2022 20:38:43 +0000 (+0100)
Subject: etnaviv: drm: don't cache mmap offset
X-Git-Tag: upstream/22.3.5~6654
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5711329cbc037346ed759333294cb198e86bd772;p=platform%2Fupstream%2Fmesa.git

etnaviv: drm: don't cache mmap offset

The mmap offset is the only information we currently get from
DRM_ETNAVIV_GEM_INFO and there is no point in storing this
offset after the mapping has been established. Reduce the
shared mutable state on the etna_bo by inlining fetching the
offset into etna_bo_map.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14466>
---

diff --git a/src/etnaviv/drm/etnaviv_bo.c b/src/etnaviv/drm/etnaviv_bo.c
index fc91990..b0a3dfa 100644
--- a/src/etnaviv/drm/etnaviv_bo.c
+++ b/src/etnaviv/drm/etnaviv_bo.c
@@ -220,26 +220,6 @@ struct etna_bo *etna_bo_ref(struct etna_bo *bo)
 	return bo;
 }
 
-/* get buffer info */
-static int get_buffer_info(struct etna_bo *bo)
-{
-	int ret;
-	struct drm_etnaviv_gem_info req = {
-		.handle = bo->handle,
-	};
-
-	ret = drmCommandWriteRead(bo->dev->fd, DRM_ETNAVIV_GEM_INFO,
-			&req, sizeof(req));
-	if (ret) {
-		return ret;
-	}
-
-	/* really all we need for now is mmap offset */
-	bo->offset = req.offset;
-
-	return 0;
-}
-
 /* import a buffer object from DRI2 name */
 struct etna_bo *etna_bo_from_name(struct etna_device *dev,
 		uint32_t name)
@@ -407,12 +387,18 @@ uint32_t etna_bo_gpu_va(struct etna_bo *bo)
 void *etna_bo_map(struct etna_bo *bo)
 {
 	if (!bo->map) {
-		if (!bo->offset) {
-			get_buffer_info(bo);
-		}
+		int ret;
+		struct drm_etnaviv_gem_info req = {
+			.handle = bo->handle,
+		};
+
+		ret = drmCommandWriteRead(bo->dev->fd, DRM_ETNAVIV_GEM_INFO,
+					&req, sizeof(req));
+		if (ret)
+			return NULL;
 
 		bo->map = os_mmap(0, bo->size, PROT_READ | PROT_WRITE,
-				  MAP_SHARED, bo->dev->fd, bo->offset);
+				  MAP_SHARED, bo->dev->fd, req.offset);
 		if (bo->map == MAP_FAILED) {
 			ERROR_MSG("mmap failed: %s", strerror(errno));
 			bo->map = NULL;
diff --git a/src/etnaviv/drm/etnaviv_priv.h b/src/etnaviv/drm/etnaviv_priv.h
index 3cd380f..d9233a1 100644
--- a/src/etnaviv/drm/etnaviv_priv.h
+++ b/src/etnaviv/drm/etnaviv_priv.h
@@ -109,7 +109,6 @@ struct etna_bo {
 	uint32_t        handle;
 	uint32_t        flags;
 	uint32_t        name;           /* flink global handle (DRI2 name) */
-	uint64_t        offset;         /* offset to mmap() */
 	uint32_t        va;             /* GPU virtual address */
 	int		refcnt;