[PATCH v2] soc / drm: mediatek: cmdq: Remove timeout handler in helper function

Matthias Brugger matthias.bgg at gmail.com
Fri Nov 27 17:37:13 EST 2020



On 27/11/2020 15:42, Chun-Kuang Hu wrote:
> Hi, Matthias:
> 
> Matthias Brugger <matthias.bgg at gmail.com> 於 2020年11月27日 週五 下午8:40寫道:
>>
>> Hi Chun-Kuang,
>>
>> On 20/11/2020 00:46, Chun-Kuang Hu wrote:
>>> Hi, Matthias:
>>>
>>> I've provided the example for why of this patch. How do you think
>>> about this patch?
>>>
>>
>> Patch looks good to me. If you want to take it through your tree you can add my
>> Acked-by: Matthias Brugger <matthias.bgg at gmail.com>
>>
>> Beware that you might need a stable tag for it, so that I can merge it into my
>> soc branch, in case there are more changes to cmdq-helper.
> 
> I would like this patch to go into your tree because this patch mainly
> modify cmdq helper. Even though this patch is one of the series
> "Mediatek DRM driver detect CMDQ execution timeout by vblank IRQ" [1],
> I would wait for this patch get into mainline then send the next
> patch.
> 

Applied to v5.10-next/soc

Thanks!

> Regards,
> Chun-Kuang.
> 
>>
>> Regards,
>> Matthias
>>
>>> Regards,
>>> Chun-Kuang.
>>>
>>> Chun-Kuang Hu <chunkuang.hu at kernel.org> 於 2020年11月2日 週一 上午8:04寫道:
>>>>
>>>> For each client driver, its timeout handler need to dump hardware register
>>>> or its state machine information, and their way to detect timeout are
>>>> also different, so remove timeout handler in helper function and
>>>> let client driver implement its own timeout handler.
>>>>
>>>> Signed-off-by: Chun-Kuang Hu <chunkuang.hu at kernel.org>
>>>> ---
>>>> v1 is one patch in series "Mediatek DRM driver detect CMDQ execution
>>>> timeout by vblank IRQ", but according to Jassi's suggestion [1], send
>>>> each patch in different series.
>>>>
>>>> [2] is an example that different client has different way to calculate
>>>> timeout. Some client driver care about each packet's execution time, but
>>>> some client driver care about the total execution time for all packets.
>>>>
>>>> [1]
>>>> https://patchwork.kernel.org/project/linux-mediatek/cover/20200927230422.11610-1-chunkuang.hu@kernel.org/
>>>> [2]
>>>> https://patchwork.kernel.org/project/linux-mediatek/patch/20201022094152.17662-1-houlong.wei@mediatek.com/
>>>>
>>>> Changes in v2:
>>>> 1. Rebase onto Linux 5.10-rc1
>>>> ---
>>>>    drivers/gpu/drm/mediatek/mtk_drm_crtc.c |  3 +-
>>>>    drivers/soc/mediatek/mtk-cmdq-helper.c  | 41 +------------------------
>>>>    include/linux/soc/mediatek/mtk-cmdq.h   | 10 +-----
>>>>    3 files changed, 3 insertions(+), 51 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
>>>> index ac038572164d..4be5d1fccf2e 100644
>>>> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
>>>> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
>>>> @@ -824,8 +824,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>>>>    #if IS_REACHABLE(CONFIG_MTK_CMDQ)
>>>>           mtk_crtc->cmdq_client =
>>>>                           cmdq_mbox_create(mtk_crtc->mmsys_dev,
>>>> -                                        drm_crtc_index(&mtk_crtc->base),
>>>> -                                        2000);
>>>> +                                        drm_crtc_index(&mtk_crtc->base));
>>>>           if (IS_ERR(mtk_crtc->cmdq_client)) {
>>>>                   dev_dbg(dev, "mtk_crtc %d failed to create mailbox client, writing register by CPU now\n",
>>>>                           drm_crtc_index(&mtk_crtc->base));
>>>> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
>>>> index 505651b0d715..280d3bd9f675 100644
>>>> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
>>>> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
>>>> @@ -70,14 +70,7 @@ int cmdq_dev_get_client_reg(struct device *dev,
>>>>    }
>>>>    EXPORT_SYMBOL(cmdq_dev_get_client_reg);
>>>>
>>>> -static void cmdq_client_timeout(struct timer_list *t)
>>>> -{
>>>> -       struct cmdq_client *client = from_timer(client, t, timer);
>>>> -
>>>> -       dev_err(client->client.dev, "cmdq timeout!\n");
>>>> -}
>>>> -
>>>> -struct cmdq_client *cmdq_mbox_create(struct device *dev, int index, u32 timeout)
>>>> +struct cmdq_client *cmdq_mbox_create(struct device *dev, int index)
>>>>    {
>>>>           struct cmdq_client *client;
>>>>
>>>> @@ -85,12 +78,6 @@ struct cmdq_client *cmdq_mbox_create(struct device *dev, int index, u32 timeout)
>>>>           if (!client)
>>>>                   return (struct cmdq_client *)-ENOMEM;
>>>>
>>>> -       client->timeout_ms = timeout;
>>>> -       if (timeout != CMDQ_NO_TIMEOUT) {
>>>> -               spin_lock_init(&client->lock);
>>>> -               timer_setup(&client->timer, cmdq_client_timeout, 0);
>>>> -       }
>>>> -       client->pkt_cnt = 0;
>>>>           client->client.dev = dev;
>>>>           client->client.tx_block = false;
>>>>           client->client.knows_txdone = true;
>>>> @@ -112,11 +99,6 @@ EXPORT_SYMBOL(cmdq_mbox_create);
>>>>
>>>>    void cmdq_mbox_destroy(struct cmdq_client *client)
>>>>    {
>>>> -       if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
>>>> -               spin_lock(&client->lock);
>>>> -               del_timer_sync(&client->timer);
>>>> -               spin_unlock(&client->lock);
>>>> -       }
>>>>           mbox_free_channel(client->chan);
>>>>           kfree(client);
>>>>    }
>>>> @@ -449,18 +431,6 @@ static void cmdq_pkt_flush_async_cb(struct cmdq_cb_data data)
>>>>           struct cmdq_task_cb *cb = &pkt->cb;
>>>>           struct cmdq_client *client = (struct cmdq_client *)pkt->cl;
>>>>
>>>> -       if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
>>>> -               unsigned long flags = 0;
>>>> -
>>>> -               spin_lock_irqsave(&client->lock, flags);
>>>> -               if (--client->pkt_cnt == 0)
>>>> -                       del_timer(&client->timer);
>>>> -               else
>>>> -                       mod_timer(&client->timer, jiffies +
>>>> -                                 msecs_to_jiffies(client->timeout_ms));
>>>> -               spin_unlock_irqrestore(&client->lock, flags);
>>>> -       }
>>>> -
>>>>           dma_sync_single_for_cpu(client->chan->mbox->dev, pkt->pa_base,
>>>>                                   pkt->cmd_buf_size, DMA_TO_DEVICE);
>>>>           if (cb->cb) {
>>>> @@ -473,7 +443,6 @@ int cmdq_pkt_flush_async(struct cmdq_pkt *pkt, cmdq_async_flush_cb cb,
>>>>                            void *data)
>>>>    {
>>>>           int err;
>>>> -       unsigned long flags = 0;
>>>>           struct cmdq_client *client = (struct cmdq_client *)pkt->cl;
>>>>
>>>>           pkt->cb.cb = cb;
>>>> @@ -484,14 +453,6 @@ int cmdq_pkt_flush_async(struct cmdq_pkt *pkt, cmdq_async_flush_cb cb,
>>>>           dma_sync_single_for_device(client->chan->mbox->dev, pkt->pa_base,
>>>>                                      pkt->cmd_buf_size, DMA_TO_DEVICE);
>>>>
>>>> -       if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
>>>> -               spin_lock_irqsave(&client->lock, flags);
>>>> -               if (client->pkt_cnt++ == 0)
>>>> -                       mod_timer(&client->timer, jiffies +
>>>> -                                 msecs_to_jiffies(client->timeout_ms));
>>>> -               spin_unlock_irqrestore(&client->lock, flags);
>>>> -       }
>>>> -
>>>>           err = mbox_send_message(client->chan, pkt);
>>>>           if (err < 0)
>>>>                   return err;
>>>> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
>>>> index 960704d75994..8e9996610978 100644
>>>> --- a/include/linux/soc/mediatek/mtk-cmdq.h
>>>> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
>>>> @@ -11,7 +11,6 @@
>>>>    #include <linux/mailbox/mtk-cmdq-mailbox.h>
>>>>    #include <linux/timer.h>
>>>>
>>>> -#define CMDQ_NO_TIMEOUT                0xffffffffu
>>>>    #define CMDQ_ADDR_HIGH(addr)   ((u32)(((addr) >> 16) & GENMASK(31, 0)))
>>>>    #define CMDQ_ADDR_LOW(addr)    ((u16)(addr) | BIT(1))
>>>>
>>>> @@ -24,12 +23,8 @@ struct cmdq_client_reg {
>>>>    };
>>>>
>>>>    struct cmdq_client {
>>>> -       spinlock_t lock;
>>>> -       u32 pkt_cnt;
>>>>           struct mbox_client client;
>>>>           struct mbox_chan *chan;
>>>> -       struct timer_list timer;
>>>> -       u32 timeout_ms; /* in unit of microsecond */
>>>>    };
>>>>
>>>>    /**
>>>> @@ -51,13 +46,10 @@ int cmdq_dev_get_client_reg(struct device *dev,
>>>>     * cmdq_mbox_create() - create CMDQ mailbox client and channel
>>>>     * @dev:       device of CMDQ mailbox client
>>>>     * @index:     index of CMDQ mailbox channel
>>>> - * @timeout:   timeout of a pkt execution by GCE, in unit of microsecond, set
>>>> - *             CMDQ_NO_TIMEOUT if a timer is not used.
>>>>     *
>>>>     * Return: CMDQ mailbox client pointer
>>>>     */
>>>> -struct cmdq_client *cmdq_mbox_create(struct device *dev, int index,
>>>> -                                    u32 timeout);
>>>> +struct cmdq_client *cmdq_mbox_create(struct device *dev, int index);
>>>>
>>>>    /**
>>>>     * cmdq_mbox_destroy() - destroy CMDQ mailbox client and channel
>>>> --
>>>> 2.17.1
>>>>



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