qxl: keep separate release_bo pointer

qxl expects that list_first_entry(release->bos) returns the first
element qxl added to the list.  ttm_eu_reserve_buffers() may reorder
the list though.

Add a release_bo field to struct qxl_release and use that instead.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20180418054257.15388-3-kraxel@redhat.com
Signed-off-by: Sean Paul <seanpaul@chromium.org>

diff --git a/drivers/gpu/drm/qxl/qxl_cmd.c b/drivers/gpu/drm/qxl/qxl_cmd.c
index c0fb52c..01665b9 100644 (file)
--- a/drivers/gpu/drm/qxl/qxl_cmd.c
+++ b/drivers/gpu/drm/qxl/qxl_cmd.c
@@ -179,10 +179,9 @@ qxl_push_command_ring_release(struct qxl_device *qdev, struct qxl_release *relea
                              uint32_t type, bool interruptible)
 {
        struct qxl_command cmd;
-       struct qxl_bo_list *entry = list_first_entry(&release->bos, struct qxl_bo_list, tv.head);
 
        cmd.type = type;
-       cmd.data = qxl_bo_physical_address(qdev, to_qxl_bo(entry->tv.bo), release->release_offset);
+       cmd.data = qxl_bo_physical_address(qdev, release->release_bo, release->release_offset);
 
        return qxl_ring_push(qdev->command_ring, &cmd, interruptible);
 }
@@ -192,10 +191,9 @@ qxl_push_cursor_ring_release(struct qxl_device *qdev, struct qxl_release *releas
                             uint32_t type, bool interruptible)
 {
        struct qxl_command cmd;
-       struct qxl_bo_list *entry = list_first_entry(&release->bos, struct qxl_bo_list, tv.head);
 
        cmd.type = type;
-       cmd.data = qxl_bo_physical_address(qdev, to_qxl_bo(entry->tv.bo), release->release_offset);
+       cmd.data = qxl_bo_physical_address(qdev, release->release_bo, release->release_offset);
 
        return qxl_ring_push(qdev->cursor_ring, &cmd, interruptible);
 }

diff --git a/drivers/gpu/drm/qxl/qxl_drv.h b/drivers/gpu/drm/qxl/qxl_drv.h
index 00a1a66..864b456 100644 (file)
--- a/drivers/gpu/drm/qxl/qxl_drv.h
+++ b/drivers/gpu/drm/qxl/qxl_drv.h
@@ -167,6 +167,7 @@ struct qxl_release {
 
        int id;
        int type;
+       struct qxl_bo *release_bo;
        uint32_t release_offset;
        uint32_t surface_release_id;
        struct ww_acquire_ctx ticket;

diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index a0b4244..7cb2145 100644 (file)
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -173,6 +173,7 @@ qxl_release_free_list(struct qxl_release *release)
                list_del(&entry->tv.head);
                kfree(entry);
        }
+       release->release_bo = NULL;
 }
 
 void
@@ -296,7 +297,6 @@ int qxl_alloc_surface_release_reserved(struct qxl_device *qdev,
 {
        if (surface_cmd_type == QXL_SURFACE_CMD_DESTROY && create_rel) {
                int idr_ret;
-               struct qxl_bo_list *entry = list_first_entry(&create_rel->bos, struct qxl_bo_list, tv.head);
                struct qxl_bo *bo;
                union qxl_release_info *info;
 
@@ -304,8 +304,9 @@ int qxl_alloc_surface_release_reserved(struct qxl_device *qdev,
                idr_ret = qxl_release_alloc(qdev, QXL_RELEASE_SURFACE_CMD, release);
                if (idr_ret < 0)
                        return idr_ret;
-               bo = to_qxl_bo(entry->tv.bo);
+               bo = create_rel->release_bo;
 
+               (*release)->release_bo = bo;
                (*release)->release_offset = create_rel->release_offset + 64;
 
                qxl_release_list_add(*release, bo);
@@ -365,6 +366,7 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
 
        bo = qxl_bo_ref(qdev->current_release_bo[cur_idx]);
 
+       (*release)->release_bo = bo;
        (*release)->release_offset = qdev->current_release_bo_offset[cur_idx] * release_size_per_bo[cur_idx];
        qdev->current_release_bo_offset[cur_idx]++;
 
@@ -408,8 +410,7 @@ union qxl_release_info *qxl_release_map(struct qxl_device *qdev,
 {
        void *ptr;
        union qxl_release_info *info;
-       struct qxl_bo_list *entry = list_first_entry(&release->bos, struct qxl_bo_list, tv.head);
-       struct qxl_bo *bo = to_qxl_bo(entry->tv.bo);
+       struct qxl_bo *bo = release->release_bo;
 
        ptr = qxl_bo_kmap_atomic_page(qdev, bo, release->release_offset & PAGE_MASK);
        if (!ptr)
@@ -422,8 +423,7 @@ void qxl_release_unmap(struct qxl_device *qdev,
                       struct qxl_release *release,
                       union qxl_release_info *info)
 {
-       struct qxl_bo_list *entry = list_first_entry(&release->bos, struct qxl_bo_list, tv.head);
-       struct qxl_bo *bo = to_qxl_bo(entry->tv.bo);
+       struct qxl_bo *bo = release->release_bo;
        void *ptr;
 
        ptr = ((void *)info) - (release->release_offset & ~PAGE_MASK);