drm/msm: Drop msm_gem_iova()

There was only a single user, which could just as easily stash the iova
when pinning.

v2: fix prepare->prepare->cleanup->cleanup sequences
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20220411215849.297838-7-robdclark@gmail.comSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/msm_fb.c

@@ -21,6 +21,10 @@ struct msm_framebuffer {
 
 	/* Count of # of attached planes which need dirtyfb: */
 	refcount_t dirtyfb;
+
+	/* Framebuffer per-plane address, if pinned, else zero: */
+	uint64_t iova[DRM_FORMAT_MAX_PLANES];
+	atomic_t prepare_count;
 };
 #define to_msm_framebuffer(x) container_of(x, struct msm_framebuffer, base)
 
@@ -76,14 +80,16 @@ int msm_framebuffer_prepare(struct drm_framebuffer *fb,
 {
 	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 	int ret, i, n = fb->format->num_planes;
-	uint64_t iova;
 
 	if (needs_dirtyfb)
 		refcount_inc(&msm_fb->dirtyfb);
 
+	atomic_inc(&msm_fb->prepare_count);
+
 	for (i = 0; i < n; i++) {
-		ret = msm_gem_get_and_pin_iova(fb->obj[i], aspace, &iova);
-		drm_dbg_state(fb->dev, "FB[%u]: iova[%d]: %08llx (%d)", fb->base.id, i, iova, ret);
+		ret = msm_gem_get_and_pin_iova(fb->obj[i], aspace, &msm_fb->iova[i]);
+		drm_dbg_state(fb->dev, "FB[%u]: iova[%d]: %08llx (%d)",
+			      fb->base.id, i, msm_fb->iova[i], ret);
 		if (ret)
 			return ret;
 	}
@@ -103,14 +109,16 @@ void msm_framebuffer_cleanup(struct drm_framebuffer *fb,
 
 	for (i = 0; i < n; i++)
 		msm_gem_unpin_iova(fb->obj[i], aspace);
+
+	if (!atomic_dec_return(&msm_fb->prepare_count))
+		memset(msm_fb->iova, 0, sizeof(msm_fb->iova));
 }
 
 uint32_t msm_framebuffer_iova(struct drm_framebuffer *fb,
 		struct msm_gem_address_space *aspace, int plane)
 {
-	if (!fb->obj[plane])
-		return 0;
-	return msm_gem_iova(fb->obj[plane], aspace) + fb->offsets[plane];
+	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
+	return msm_fb->iova[plane];
 }
 
 struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)

drivers/gpu/drm/msm/msm_gem.c

@@ -509,22 +509,6 @@ int msm_gem_get_iova(struct drm_gem_object *obj,
 	return ret;
 }
 
-/* get iova without taking a reference, used in places where you have
- * already done a 'msm_gem_get_and_pin_iova' or 'msm_gem_get_iova'
- */
-uint64_t msm_gem_iova(struct drm_gem_object *obj,
-		struct msm_gem_address_space *aspace)
-{
-	struct msm_gem_vma *vma;
-
-	msm_gem_lock(obj);
-	vma = lookup_vma(obj, aspace);
-	msm_gem_unlock(obj);
-	GEM_WARN_ON(!vma);
-
-	return vma ? vma->iova : 0;
-}
-
 /*
  * Locked variant of msm_gem_unpin_iova()
  */

drivers/gpu/drm/msm/msm_gem.h

@@ -142,8 +142,6 @@ int msm_gem_get_and_pin_iova_locked(struct drm_gem_object *obj,
 		struct msm_gem_address_space *aspace, uint64_t *iova);
 int msm_gem_get_and_pin_iova(struct drm_gem_object *obj,
 		struct msm_gem_address_space *aspace, uint64_t *iova);
-uint64_t msm_gem_iova(struct drm_gem_object *obj,
-		struct msm_gem_address_space *aspace);
 void msm_gem_unpin_iova_locked(struct drm_gem_object *obj,
 		struct msm_gem_address_space *aspace);
 void msm_gem_unpin_iova(struct drm_gem_object *obj,