Le 21/09/2024 à 06:33, Ryosuke Yasuoka a écrit :
QXL supports the drm_panic module, which displays a message to the
screen when a kernel panic occurs.
Signed-off-by: Ryosuke Yasuoka <ryasuoka@xxxxxxxxxx>
---
Hi,
a few comments/nitpicks below, if of interest.
diff --git a/drivers/gpu/drm/qxl/qxl_cmd.c b/drivers/gpu/drm/qxl/qxl_cmd.c
index d6ea01f3797b..a3dd2ed4d9c7 100644
--- a/drivers/gpu/drm/qxl/qxl_cmd.c
+++ b/drivers/gpu/drm/qxl/qxl_cmd.c
@@ -174,6 +174,35 @@ static bool qxl_ring_pop(struct qxl_ring *ring,
return true;
}
+/* For drm panic */
+int
+qxl_push_command_ring_without_release(struct qxl_device *qdev,
+ struct qxl_bo *bo, uint32_t offset)
+{
+ struct qxl_command cmd;
+ struct qxl_ring *ring = qdev->command_ring;
+ struct qxl_ring_header *header = &(ring->ring->header);
Nitpick: I think that these () can be removed.
+ uint8_t *elt;
+ int idx;
+
+ cmd.type = QXL_CMD_DRAW;
+ cmd.data = qxl_bo_physical_address(qdev, bo, offset);
+
+ idx = header->prod & (ring->n_elements - 1);
+ elt = ring->ring->elements + idx * ring->element_size;
+
+ memcpy((void *)elt, &cmd, ring->element_size);
+
+ header->prod++;
+
+ mb();
+
+ if (header->prod == header->notify_on_prod)
+ outb(0, ring->prod_notify);
+
+ return 0;
+}
...
+int qxl_push_command_ring_without_release(struct qxl_device *qdev,
+ struct qxl_bo *bo, uint32_t offset);
+
+
Nitpick: no need for 2 empty lines.
int
qxl_push_command_ring_release(struct qxl_device *qdev, struct qxl_release *release,
uint32_t type, bool interruptible);
...
+int
+qxl_image_alloc_objects_without_release(struct qxl_device *qdev,
+ struct qxl_drm_image *image,
+ struct qxl_drm_chunk *chunk,
+ struct qxl_bo *image_bo, struct qxl_bo *chunk_bo,
+ uint8_t *surface_base, int width, int height,
+ int depth, int stride)
+{
+ int ret;
+ unsigned int chunk_size = sizeof(struct qxl_data_chunk) + stride * height;
+
+ INIT_LIST_HEAD(&image->chunk_list);
+ qxl_panic_bo_create(qdev, sizeof(struct qxl_image), image_bo);
+ image->bo = image_bo;
+
+ qxl_panic_bo_create(qdev, chunk_size, chunk_bo);
+ chunk->bo = chunk_bo;
+ list_add_tail(&chunk->head, &image->chunk_list);
+
+ ret = qxl_image_init(qdev, NULL, image, surface_base,
+ 0, 0, width, height, depth, stride);
+ return ret;
+
Nitpick: unneeeded empty line.
+}
+
int
qxl_image_alloc_objects(struct qxl_device *qdev,
struct qxl_release *release,
diff --git a/drivers/gpu/drm/qxl/qxl_object.c b/drivers/gpu/drm/qxl/qxl_object.c
index 66635c55cf85..cdba20718674 100644
--- a/drivers/gpu/drm/qxl/qxl_object.c
+++ b/drivers/gpu/drm/qxl/qxl_object.c
@@ -29,6 +29,16 @@
#include "qxl_drv.h"
#include "qxl_object.h"
+/* For drm panic */
+static void qxl_panic_ttm_bo_destroy(struct ttm_buffer_object *tbo)
+{
+ struct qxl_bo *bo;
+
+ bo = to_qxl_bo(tbo);
+ WARN_ON_ONCE(bo->map_count > 0);
+ drm_gem_object_release(&bo->tbo.base);
+}
+
static void qxl_ttm_bo_destroy(struct ttm_buffer_object *tbo)
{
struct qxl_bo *bo;
@@ -101,6 +111,42 @@ static const struct drm_gem_object_funcs qxl_object_funcs = {
.print_info = drm_gem_ttm_print_info,
};
+/* For drm panic */
+int qxl_panic_bo_create(struct qxl_device *qdev, unsigned long size, struct qxl_bo *bo)
This function is used 3 times in this patch. Its returned value is never
checked. Should some error handling be removed, or maybe change this
function to return void?
+{
+ u32 domain = QXL_GEM_DOMAIN_VRAM;
+ struct ttm_operation_ctx ctx = { true, false };
+ enum ttm_bo_type type;
+ int r;
+
+ type = ttm_bo_type_device;
+
+ size = roundup(size, PAGE_SIZE);
+ r = drm_gem_object_init(&qdev->ddev, &bo->tbo.base, size);
+ if (unlikely(r))
+ return r;
+ bo->tbo.base.funcs = &qxl_object_funcs;
+ bo->type = domain;
+ bo->surface_id = 0;
+ INIT_LIST_HEAD(&bo->list);
+
+ qxl_ttm_placement_from_domain(bo, domain);
+
+ bo->tbo.priority = 0;
+ r = ttm_bo_init_reserved(&qdev->mman.bdev, &bo->tbo, type,
+ &bo->placement, 0, &ctx, NULL, NULL,
+ &qxl_panic_ttm_bo_destroy);
+ if (unlikely(r != 0)) {
unlikely() is used in several places. Does it really bring any benefit?
+ if (r != -ERESTARTSYS)
+ dev_err(qdev->ddev.dev,
+ "object_init failed for (%lu, 0x%08X)\n",
+ size, domain);
+ return r;
+ }
+ ttm_bo_unreserve(&bo->tbo);
+ return 0;
+}
...
CJ