Hi Laurent,
Thankyou for the patch.
On 17/05/17 00:20, Laurent Pinchart wrote:
> For planes handled by a VSP instance, map the framebuffer memory through
> the VSP to ensure proper IOMMU handling.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
Looks good except for a small unsigned int comparison causing an infinite loop
on fail case.
With the loop fixed:
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/rcar-du/rcar_du_vsp.c | 74 ++++++++++++++++++++++++++++++++---
> drivers/gpu/drm/rcar-du/rcar_du_vsp.h | 2 +
> 2 files changed, 70 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
> index b0ff304ce3dc..1b874cfd40f3 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
> @@ -19,7 +19,9 @@
> #include <drm/drm_gem_cma_helper.h>
> #include <drm/drm_plane_helper.h>
>
> +#include <linux/dma-mapping.h>
> #include <linux/of_platform.h>
> +#include <linux/scatterlist.h>
> #include <linux/videodev2.h>
>
> #include <media/vsp1.h>
> @@ -170,12 +172,9 @@ static void rcar_du_vsp_plane_setup(struct rcar_du_vsp_plane *plane)
> cfg.dst.width = state->state.crtc_w;
> cfg.dst.height = state->state.crtc_h;
>
> - for (i = 0; i < state->format->planes; ++i) {
> - struct drm_gem_cma_object *gem;
> -
> - gem = drm_fb_cma_get_gem_obj(fb, i);
> - cfg.mem[i] = gem->paddr + fb->offsets[i];
> - }
> + for (i = 0; i < state->format->planes; ++i)
> + cfg.mem[i] = sg_dma_address(state->sg_tables[i].sgl)
> + + fb->offsets[i];
>
> for (i = 0; i < ARRAY_SIZE(formats_kms); ++i) {
> if (formats_kms[i] == state->format->fourcc) {
> @@ -187,6 +186,67 @@ static void rcar_du_vsp_plane_setup(struct rcar_du_vsp_plane *plane)
> vsp1_du_atomic_update(plane->vsp->vsp, plane->index, &cfg);
> }
>
> +static int rcar_du_vsp_plane_prepare_fb(struct drm_plane *plane,
> + struct drm_plane_state *state)
> +{
> + struct rcar_du_vsp_plane_state *rstate = to_rcar_vsp_plane_state(state);
> + struct rcar_du_vsp *vsp = to_rcar_vsp_plane(plane)->vsp;
> + struct rcar_du_device *rcdu = vsp->dev;
> + unsigned int i;
Unsigned here..
> + int ret;
> +
> + if (!state->fb)
> + return 0;
> +
> + for (i = 0; i < rstate->format->planes; ++i) {
> + struct drm_gem_cma_object *gem =
> + drm_fb_cma_get_gem_obj(state->fb, i);
> + struct sg_table *sgt = &rstate->sg_tables[i];
> +
> + ret = dma_get_sgtable(rcdu->dev, sgt, gem->vaddr, gem->paddr,
> + gem->base.size);
> + if (ret)
> + goto fail;
> +
> + ret = vsp1_du_map_sg(vsp->vsp, sgt);
> + if (!ret) {
> + sg_free_table(sgt);
> + ret = -ENOMEM;
> + goto fail;
> + }
> + }
> +
> + return 0;
> +
> +fail:
> + for (i--; i >= 0; i--) {
Means that this loop will never exit; i will always be >= 0;
I'd propose just making signed for this usage.
I've checked the i values for the breakouts - so they are good, and we need to
use i == 0 to unmap the last table.
> + struct sg_table *sgt = &rstate->sg_tables[i];
> +
> + vsp1_du_unmap_sg(vsp->vsp, sgt);
> + sg_free_table(sgt);
> + }
> +
> + return ret;
> +}
> +
> +static void rcar_du_vsp_plane_cleanup_fb(struct drm_plane *plane,
> + struct drm_plane_state *state)
> +{
> + struct rcar_du_vsp_plane_state *rstate = to_rcar_vsp_plane_state(state);
> + struct rcar_du_vsp *vsp = to_rcar_vsp_plane(plane)->vsp;
> + unsigned int i;
> +
> + if (!state->fb)
> + return;
> +
> + for (i = 0; i < rstate->format->planes; ++i) {
> + struct sg_table *sgt = &rstate->sg_tables[i];
> +
> + vsp1_du_unmap_sg(vsp->vsp, sgt);
> + sg_free_table(sgt);
> + }
> +}
> +
> static int rcar_du_vsp_plane_atomic_check(struct drm_plane *plane,
> struct drm_plane_state *state)
> {
> @@ -227,6 +287,8 @@ static void rcar_du_vsp_plane_atomic_update(struct drm_plane *plane,
> }
>
> static const struct drm_plane_helper_funcs rcar_du_vsp_plane_helper_funcs = {
> + .prepare_fb = rcar_du_vsp_plane_prepare_fb,
> + .cleanup_fb = rcar_du_vsp_plane_cleanup_fb,
> .atomic_check = rcar_du_vsp_plane_atomic_check,
> .atomic_update = rcar_du_vsp_plane_atomic_update,
> };
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.h b/drivers/gpu/drm/rcar-du/rcar_du_vsp.h
> index f1d0f1824528..8861661590ff 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.h
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.h
> @@ -43,6 +43,7 @@ static inline struct rcar_du_vsp_plane *to_rcar_vsp_plane(struct drm_plane *p)
> * struct rcar_du_vsp_plane_state - Driver-specific plane state
> * @state: base DRM plane state
> * @format: information about the pixel format used by the plane
> + * @sg_tables: scatter-gather tables for the frame buffer memory
> * @alpha: value of the plane alpha property
> * @zpos: value of the plane zpos property
> */
> @@ -50,6 +51,7 @@ struct rcar_du_vsp_plane_state {
> struct drm_plane_state state;
>
> const struct rcar_du_format_info *format;
> + struct sg_table sg_tables[3];
>
> unsigned int alpha;
> unsigned int zpos;
>
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