Subject: [patch V3 34/37] drm/qxl: Replace io_mapping_map_atomic_wc()

From: Thomas Gleixner <[email-masked]>
Date: Tue, 03 Nov 2020 10:27:46 +0100

None of these mapping requires the side effect of disabling pagefaults and
preemption.

Use io_mapping_map_local_wc() instead, rename the related functions
accordingly and clean up qxl_process_single_command() to use a plain
copy_from_user() as the local maps are not disabling pagefaults.

Signed-off-by: Thomas Gleixner <[email-masked]>
Cc: Dave Airlie <[email-masked]>
Cc: Gerd Hoffmann <[email-masked]>
Cc: David Airlie <[email-masked]>
Cc: Daniel Vetter <[email-masked]>
Cc: [email-masked]
Cc: [email-masked]
---
V3: New patch
---
 drivers/gpu/drm/qxl/qxl_image.c   |   18 +++++++++---------
 drivers/gpu/drm/qxl/qxl_ioctl.c   |   27 +++++++++++++--------------
 drivers/gpu/drm/qxl/qxl_object.c  |   12 ++++++------
 drivers/gpu/drm/qxl/qxl_object.h  |    4 ++--
 drivers/gpu/drm/qxl/qxl_release.c |    4 ++--
 5 files changed, 32 insertions(+), 33 deletions(-)

--- a/drivers/gpu/drm/qxl/qxl_image.c
+++ b/drivers/gpu/drm/qxl/qxl_image.c
@@ -124,12 +124,12 @@ qxl_image_init_helper(struct qxl_device
 				  wrong (check the bitmaps are sent correctly
 				  first) */
 
-	ptr = qxl_bo_kmap_atomic_page(qdev, chunk_bo, 0);
+	ptr = qxl_bo_kmap_local_page(qdev, chunk_bo, 0);
 	chunk = ptr;
 	chunk->data_size = height * chunk_stride;
 	chunk->prev_chunk = 0;
 	chunk->next_chunk = 0;
-	qxl_bo_kunmap_atomic_page(qdev, chunk_bo, ptr);
+	qxl_bo_kunmap_local_page(qdev, chunk_bo, ptr);
 
 	{
 		void *k_data, *i_data;
@@ -143,7 +143,7 @@ qxl_image_init_helper(struct qxl_device
 			i_data = (void *)data;
 
 			while (remain > 0) {
-				ptr = qxl_bo_kmap_atomic_page(qdev, chunk_bo, page << PAGE_SHIFT);
+				ptr = qxl_bo_kmap_local_page(qdev, chunk_bo, page << PAGE_SHIFT);
 
 				if (page == 0) {
 					chunk = ptr;
@@ -157,7 +157,7 @@ qxl_image_init_helper(struct qxl_device
 
 				memcpy(k_data, i_data, size);
 
-				qxl_bo_kunmap_atomic_page(qdev, chunk_bo, ptr);
+				qxl_bo_kunmap_local_page(qdev, chunk_bo, ptr);
 				i_data += size;
 				remain -= size;
 				page++;
@@ -175,10 +175,10 @@ qxl_image_init_helper(struct qxl_device
 					page_offset = offset_in_page(out_offset);
 					size = min((int)(PAGE_SIZE - page_offset), remain);
 
-					ptr = qxl_bo_kmap_atomic_page(qdev, chunk_bo, page_base);
+					ptr = qxl_bo_kmap_local_page(qdev, chunk_bo, page_base);
 					k_data = ptr + page_offset;
 					memcpy(k_data, i_data, size);
-					qxl_bo_kunmap_atomic_page(qdev, chunk_bo, ptr);
+					qxl_bo_kunmap_local_page(qdev, chunk_bo, ptr);
 					remain -= size;
 					i_data += size;
 					out_offset += size;
@@ -189,7 +189,7 @@ qxl_image_init_helper(struct qxl_device
 	qxl_bo_kunmap(chunk_bo);
 
 	image_bo = dimage->bo;
-	ptr = qxl_bo_kmap_atomic_page(qdev, image_bo, 0);
+	ptr = qxl_bo_kmap_local_page(qdev, image_bo, 0);
 	image = ptr;
 
 	image->descriptor.id = 0;
@@ -212,7 +212,7 @@ qxl_image_init_helper(struct qxl_device
 		break;
 	default:
 		DRM_ERROR("unsupported image bit depth\n");
-		qxl_bo_kunmap_atomic_page(qdev, image_bo, ptr);
+		qxl_bo_kunmap_local_page(qdev, image_bo, ptr);
 		return -EINVAL;
 	}
 	image->u.bitmap.flags = QXL_BITMAP_TOP_DOWN;
@@ -222,7 +222,7 @@ qxl_image_init_helper(struct qxl_device
 	image->u.bitmap.palette = 0;
 	image->u.bitmap.data = qxl_bo_physical_address(qdev, chunk_bo, 0);
 
-	qxl_bo_kunmap_atomic_page(qdev, image_bo, ptr);
+	qxl_bo_kunmap_local_page(qdev, image_bo, ptr);
 
 	return 0;
 }
--- a/drivers/gpu/drm/qxl/qxl_ioctl.c
+++ b/drivers/gpu/drm/qxl/qxl_ioctl.c
@@ -89,11 +89,11 @@ apply_reloc(struct qxl_device *qdev, str
 {
 	void *reloc_page;
 
-	reloc_page = qxl_bo_kmap_atomic_page(qdev, info->dst_bo, info->dst_offset & PAGE_MASK);
+	reloc_page = qxl_bo_kmap_local_page(qdev, info->dst_bo, info->dst_offset & PAGE_MASK);
 	*(uint64_t *)(reloc_page + (info->dst_offset & ~PAGE_MASK)) = qxl_bo_physical_address(qdev,
 											      info->src_bo,
 											      info->src_offset);
-	qxl_bo_kunmap_atomic_page(qdev, info->dst_bo, reloc_page);
+	qxl_bo_kunmap_local_page(qdev, info->dst_bo, reloc_page);
 }
 
 static void
@@ -105,9 +105,9 @@ apply_surf_reloc(struct qxl_device *qdev
 	if (info->src_bo && !info->src_bo->is_primary)
 		id = info->src_bo->surface_id;
 
-	reloc_page = qxl_bo_kmap_atomic_page(qdev, info->dst_bo, info->dst_offset & PAGE_MASK);
+	reloc_page = qxl_bo_kmap_local_page(qdev, info->dst_bo, info->dst_offset & PAGE_MASK);
 	*(uint32_t *)(reloc_page + (info->dst_offset & ~PAGE_MASK)) = id;
-	qxl_bo_kunmap_atomic_page(qdev, info->dst_bo, reloc_page);
+	qxl_bo_kunmap_local_page(qdev, info->dst_bo, reloc_page);
 }
 
 /* return holding the reference to this object */
@@ -149,7 +149,6 @@ static int qxl_process_single_command(st
 	struct qxl_bo *cmd_bo;
 	void *fb_cmd;
 	int i, ret, num_relocs;
-	int unwritten;
 
 	switch (cmd->type) {
 	case QXL_CMD_DRAW:
@@ -185,21 +184,21 @@ static int qxl_process_single_command(st
 		goto out_free_reloc;
 
 	/* TODO copy slow path code from i915 */
-	fb_cmd = qxl_bo_kmap_atomic_page(qdev, cmd_bo, (release->release_offset & PAGE_MASK));
-	unwritten = __copy_from_user_inatomic_nocache
-		(fb_cmd + sizeof(union qxl_release_info) + (release->release_offset & ~PAGE_MASK),
-		 u64_to_user_ptr(cmd->command), cmd->command_size);
+	fb_cmd = qxl_bo_kmap_local_page(qdev, cmd_bo, (release->release_offset & PAGE_MASK));
 
-	{
+	if (copy_from_user(fb_cmd + sizeof(union qxl_release_info) +
+			   (release->release_offset & ~PAGE_MASK),
+			   u64_to_user_ptr(cmd->command), cmd->command_size)) {
+		ret = -EFAULT;
+	} else {
 		struct qxl_drawable *draw = fb_cmd;
 
 		draw->mm_time = qdev->rom->mm_clock;
 	}
 
-	qxl_bo_kunmap_atomic_page(qdev, cmd_bo, fb_cmd);
-	if (unwritten) {
-		DRM_ERROR("got unwritten %d\n", unwritten);
-		ret = -EFAULT;
+	qxl_bo_kunmap_local_page(qdev, cmd_bo, fb_cmd);
+	if (ret) {
+		DRM_ERROR("copy from user failed %d\n", ret);
 		goto out_free_release;
 	}
 
--- a/drivers/gpu/drm/qxl/qxl_object.c
+++ b/drivers/gpu/drm/qxl/qxl_object.c
@@ -172,8 +172,8 @@ int qxl_bo_kmap(struct qxl_bo *bo, void
 	return 0;
 }
 
-void *qxl_bo_kmap_atomic_page(struct qxl_device *qdev,
-			      struct qxl_bo *bo, int page_offset)
+void *qxl_bo_kmap_local_page(struct qxl_device *qdev,
+			     struct qxl_bo *bo, int page_offset)
 {
 	unsigned long offset;
 	void *rptr;
@@ -188,7 +188,7 @@ void *qxl_bo_kmap_atomic_page(struct qxl
 		goto fallback;
 
 	offset = bo->tbo.mem.start << PAGE_SHIFT;
-	return io_mapping_map_atomic_wc(map, offset + page_offset);
+	return io_mapping_map_local_wc(map, offset + page_offset);
 fallback:
 	if (bo->kptr) {
 		rptr = bo->kptr + (page_offset * PAGE_SIZE);
@@ -214,14 +214,14 @@ void qxl_bo_kunmap(struct qxl_bo *bo)
 	ttm_bo_kunmap(&bo->kmap);
 }
 
-void qxl_bo_kunmap_atomic_page(struct qxl_device *qdev,
-			       struct qxl_bo *bo, void *pmap)
+void qxl_bo_kunmap_local_page(struct qxl_device *qdev,
+			      struct qxl_bo *bo, void *pmap)
 {
 	if ((bo->tbo.mem.mem_type != TTM_PL_VRAM) &&
 	    (bo->tbo.mem.mem_type != TTM_PL_PRIV))
 		goto fallback;
 
-	io_mapping_unmap_atomic(pmap);
+	io_mapping_unmap_local(pmap);
 	return;
  fallback:
 	qxl_bo_kunmap(bo);
--- a/drivers/gpu/drm/qxl/qxl_object.h
+++ b/drivers/gpu/drm/qxl/qxl_object.h
@@ -88,8 +88,8 @@ extern int qxl_bo_create(struct qxl_devi
 			 struct qxl_bo **bo_ptr);
 extern int qxl_bo_kmap(struct qxl_bo *bo, void **ptr);
 extern void qxl_bo_kunmap(struct qxl_bo *bo);
-void *qxl_bo_kmap_atomic_page(struct qxl_device *qdev, struct qxl_bo *bo, int page_offset);
-void qxl_bo_kunmap_atomic_page(struct qxl_device *qdev, struct qxl_bo *bo, void *map);
+void *qxl_bo_kmap_local_page(struct qxl_device *qdev, struct qxl_bo *bo, int page_offset);
+void qxl_bo_kunmap_local_page(struct qxl_device *qdev, struct qxl_bo *bo, void *map);
 extern struct qxl_bo *qxl_bo_ref(struct qxl_bo *bo);
 extern void qxl_bo_unref(struct qxl_bo **bo);
 extern int qxl_bo_pin(struct qxl_bo *bo);
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -408,7 +408,7 @@ union qxl_release_info *qxl_release_map(
 	union qxl_release_info *info;
 	struct qxl_bo *bo = release->release_bo;
 
-	ptr = qxl_bo_kmap_atomic_page(qdev, bo, release->release_offset & PAGE_MASK);
+	ptr = qxl_bo_kmap_local_page(qdev, bo, release->release_offset & PAGE_MASK);
 	if (!ptr)
 		return NULL;
 	info = ptr + (release->release_offset & ~PAGE_MASK);
@@ -423,7 +423,7 @@ void qxl_release_unmap(struct qxl_device
 	void *ptr;
 
 	ptr = ((void *)info) - (release->release_offset & ~PAGE_MASK);
-	qxl_bo_kunmap_atomic_page(qdev, bo, ptr);
+	qxl_bo_kunmap_local_page(qdev, bo, ptr);
 }
 
 void qxl_release_fence_buffer_objects(struct qxl_release *release)