Re: [PATCH 1/3] drm/mediatek: Fix crash at using pkt->cl->chan in cmdq_pkt_finalize
flat view
From: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Date: 2021-09-29 14:52:12
Also in:
dri-devel, linux-mediatek, lkml
Hi, Jason: jason-jh.lin [off-list ref] 於 2021年9月29日 週三 下午3:02寫道：
quoted hunk ↗ jump to hunk
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 <redacted> --- 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.
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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.
quoted hunk ↗ jump to hunk
} #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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