Re: [PATCH 1/3] drm/mediatek: Fix crash at using pkt->cl->chan in cmdq_pkt_finalize

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Hi, Jason:

jason-jh.lin <jason-jh.lin@xxxxxxxxxxxx> 於 2021年9月29日 週三 下午3:02寫道:
>
> Because mtk_drm_crtc_create_pkt didn't assign pkt->cl, it will
> crash at using pkt->cl->chan in cmdq_pkt_finalize.
>
> So add struct cmdq_client and let mtk_drm_crtc instance define
> cmdq_client as:
>
> struct mtk_drm_crtc {
>         /* client instance data */
>         struct cmdq_client cmdq_client;
> };
>
> and in rx_callback function can use pkt->cl to get
> struct cmdq_client.
>
> Fixes: f4be17cd5b14 ("drm/mediatek: Remove struct cmdq_client")
> Signed-off-by: jason-jh.lin <jason-jh.lin@xxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 73 +++++++++++++------------
>  1 file changed, 38 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 5f81489fc60c..e98871a8c961 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -52,8 +52,7 @@ struct mtk_drm_crtc {
>         bool                            pending_async_planes;
>
>  #if IS_REACHABLE(CONFIG_MTK_CMDQ)
> -       struct mbox_client              cmdq_cl;
> -       struct mbox_chan                *cmdq_chan;
> +       struct cmdq_client              cmdq_client;
>         struct cmdq_pkt                 cmdq_handle;
>         u32                             cmdq_event;
>         u32                             cmdq_vblank_cnt;
> @@ -227,8 +226,8 @@ struct mtk_ddp_comp *mtk_drm_ddp_comp_for_plane(struct drm_crtc *crtc,
>  }
>
>  #if IS_REACHABLE(CONFIG_MTK_CMDQ)
> -static int mtk_drm_cmdq_pkt_create(struct mbox_chan *chan, struct cmdq_pkt *pkt,
> -                                   size_t size)
> +static int mtk_drm_cmdq_pkt_create(struct cmdq_client *client, struct cmdq_pkt *pkt,
> +                                  size_t size)
>  {
>         struct device *dev;
>         dma_addr_t dma_addr;
> @@ -239,8 +238,9 @@ static int mtk_drm_cmdq_pkt_create(struct mbox_chan *chan, struct cmdq_pkt *pkt,
>                 return -ENOMEM;
>         }
>         pkt->buf_size = size;
> +       pkt->cl = (void *)client;
>
> -       dev = chan->mbox->dev;
> +       dev = client->chan->mbox->dev;
>         dma_addr = dma_map_single(dev, pkt->va_base, pkt->buf_size,
>                                   DMA_TO_DEVICE);
>         if (dma_mapping_error(dev, dma_addr)) {
> @@ -255,9 +255,11 @@ static int mtk_drm_cmdq_pkt_create(struct mbox_chan *chan, struct cmdq_pkt *pkt,
>         return 0;
>  }
>
> -static void mtk_drm_cmdq_pkt_destroy(struct mbox_chan *chan, struct cmdq_pkt *pkt)
> +static void mtk_drm_cmdq_pkt_destroy(struct cmdq_pkt *pkt)
>  {
> -       dma_unmap_single(chan->mbox->dev, pkt->pa_base, pkt->buf_size,
> +       struct cmdq_client *client = (struct cmdq_client *)pkt->cl;
> +
> +       dma_unmap_single(client->chan->mbox->dev, pkt->pa_base, pkt->buf_size,
>                          DMA_TO_DEVICE);
>         kfree(pkt->va_base);
>         kfree(pkt);
> @@ -265,8 +267,9 @@ static void mtk_drm_cmdq_pkt_destroy(struct mbox_chan *chan, struct cmdq_pkt *pk
>
>  static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg)
>  {
> -       struct mtk_drm_crtc *mtk_crtc = container_of(cl, struct mtk_drm_crtc, cmdq_cl);
>         struct cmdq_cb_data *data = mssg;
> +       struct cmdq_pkt *pkt = data->pkt;
> +       struct mtk_drm_crtc *mtk_crtc = container_of(pkt->cl, struct mtk_drm_crtc, cmdq_client);

I think you should use cl to find struct cmdq_client, and then use
struct cmdq_clint to find struct mtk_drm_crtc.
In the next patch, you could remove the local variable pkt.

>         struct mtk_crtc_state *state;
>         unsigned int i;
>
> @@ -299,7 +302,7 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg)
>         }
>
>         mtk_crtc->cmdq_vblank_cnt = 0;
> -       mtk_drm_cmdq_pkt_destroy(mtk_crtc->cmdq_chan, data->pkt);
> +       mtk_drm_cmdq_pkt_destroy(pkt);

Maybe mtk_drm_cmdq_pkt_destroy(data->pkt); , so you need not the local
variable pkt.

Regards,
Chun-Kuang.



>  }
>  #endif
>
> @@ -550,24 +553,24 @@ static void mtk_drm_crtc_update_config(struct mtk_drm_crtc *mtk_crtc,
>                 mtk_mutex_release(mtk_crtc->mutex);
>         }
>  #if IS_REACHABLE(CONFIG_MTK_CMDQ)
> -       if (mtk_crtc->cmdq_chan) {
> -               mbox_flush(mtk_crtc->cmdq_chan, 2000);
> +       if (mtk_crtc->cmdq_client.chan) {
> +               mbox_flush(mtk_crtc->cmdq_client.chan, 2000);
>                 cmdq_handle->cmd_buf_size = 0;
>                 cmdq_pkt_clear_event(cmdq_handle, mtk_crtc->cmdq_event);
>                 cmdq_pkt_wfe(cmdq_handle, mtk_crtc->cmdq_event, false);
>                 mtk_crtc_ddp_config(crtc, cmdq_handle);
>                 cmdq_pkt_finalize(cmdq_handle);
> -               dma_sync_single_for_device(mtk_crtc->cmdq_chan->mbox->dev,
> -                                           cmdq_handle->pa_base,
> -                                           cmdq_handle->cmd_buf_size,
> -                                           DMA_TO_DEVICE);
> +               dma_sync_single_for_device(mtk_crtc->cmdq_client.chan->mbox->dev,
> +                                          cmdq_handle->pa_base,
> +                                          cmdq_handle->cmd_buf_size,
> +                                          DMA_TO_DEVICE);
>                 /*
>                  * CMDQ command should execute in next vblank,
>                  * If it fail to execute in next 2 vblank, timeout happen.
>                  */
>                 mtk_crtc->cmdq_vblank_cnt = 2;
> -               mbox_send_message(mtk_crtc->cmdq_chan, cmdq_handle);
> -               mbox_client_txdone(mtk_crtc->cmdq_chan, 0);
> +               mbox_send_message(mtk_crtc->cmdq_client.chan, cmdq_handle);
> +               mbox_client_txdone(mtk_crtc->cmdq_client.chan, 0);
>         }
>  #endif
>         mtk_crtc->config_updating = false;
> @@ -581,7 +584,7 @@ static void mtk_crtc_ddp_irq(void *data)
>         struct mtk_drm_private *priv = crtc->dev->dev_private;
>
>  #if IS_REACHABLE(CONFIG_MTK_CMDQ)
> -       if (!priv->data->shadow_register && !mtk_crtc->cmdq_chan)
> +       if (!priv->data->shadow_register && !mtk_crtc->cmdq_client.chan)
>                 mtk_crtc_ddp_config(crtc, NULL);
>         else if (mtk_crtc->cmdq_vblank_cnt > 0 && --mtk_crtc->cmdq_vblank_cnt == 0)
>                 DRM_ERROR("mtk_crtc %d CMDQ execute command timeout!\n",
> @@ -924,20 +927,20 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>         mutex_init(&mtk_crtc->hw_lock);
>
>  #if IS_REACHABLE(CONFIG_MTK_CMDQ)
> -       mtk_crtc->cmdq_cl.dev = mtk_crtc->mmsys_dev;
> -       mtk_crtc->cmdq_cl.tx_block = false;
> -       mtk_crtc->cmdq_cl.knows_txdone = true;
> -       mtk_crtc->cmdq_cl.rx_callback = ddp_cmdq_cb;
> -       mtk_crtc->cmdq_chan =
> -                       mbox_request_channel(&mtk_crtc->cmdq_cl,
> -                                             drm_crtc_index(&mtk_crtc->base));
> -       if (IS_ERR(mtk_crtc->cmdq_chan)) {
> +       mtk_crtc->cmdq_client.client.dev = mtk_crtc->mmsys_dev;
> +       mtk_crtc->cmdq_client.client.tx_block = false;
> +       mtk_crtc->cmdq_client.client.knows_txdone = true;
> +       mtk_crtc->cmdq_client.client.rx_callback = ddp_cmdq_cb;
> +       mtk_crtc->cmdq_client.chan =
> +                       mbox_request_channel(&mtk_crtc->cmdq_client.client,
> +                                            drm_crtc_index(&mtk_crtc->base));
> +       if (IS_ERR(mtk_crtc->cmdq_client.chan)) {
>                 dev_dbg(dev, "mtk_crtc %d failed to create mailbox client, writing register by CPU now\n",
>                         drm_crtc_index(&mtk_crtc->base));
> -               mtk_crtc->cmdq_chan = NULL;
> +               mtk_crtc->cmdq_client.chan = NULL;
>         }
>
> -       if (mtk_crtc->cmdq_chan) {
> +       if (mtk_crtc->cmdq_client.chan) {
>                 ret = of_property_read_u32_index(priv->mutex_node,
>                                                  "mediatek,gce-events",
>                                                  drm_crtc_index(&mtk_crtc->base),
> @@ -945,17 +948,17 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>                 if (ret) {
>                         dev_dbg(dev, "mtk_crtc %d failed to get mediatek,gce-events property\n",
>                                 drm_crtc_index(&mtk_crtc->base));
> -                       mbox_free_channel(mtk_crtc->cmdq_chan);
> -                       mtk_crtc->cmdq_chan = NULL;
> +                       mbox_free_channel(mtk_crtc->cmdq_client.chan);
> +                       mtk_crtc->cmdq_client.chan = NULL;
>                 } else {
> -                       ret = mtk_drm_cmdq_pkt_create(mtk_crtc->cmdq_chan,
> -                                                      &mtk_crtc->cmdq_handle,
> -                                                      PAGE_SIZE);
> +                       ret = mtk_drm_cmdq_pkt_create(&mtk_crtc->cmdq_client,
> +                                                     &mtk_crtc->cmdq_handle,
> +                                                     PAGE_SIZE);
>                         if (ret) {
>                                 dev_dbg(dev, "mtk_crtc %d failed to create cmdq packet\n",
>                                         drm_crtc_index(&mtk_crtc->base));
> -                               mbox_free_channel(mtk_crtc->cmdq_chan);
> -                               mtk_crtc->cmdq_chan = NULL;
> +                               mbox_free_channel(mtk_crtc->cmdq_client.chan);
> +                               mtk_crtc->cmdq_client.chan = NULL;
>                         }
>                 }
>         }
> --
> 2.18.0
>




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