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Message-ID: <8311d145-74b0-a716-3845-c92b34a2ba0e@gmail.com>
Date: Fri, 27 Nov 2020 23:37:13 +0100
From: Matthias Brugger <matthias.bgg@...il.com>
To: Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc: linux-kernel <linux-kernel@...r.kernel.org>,
DRI Development <dri-devel@...ts.freedesktop.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] soc / drm: mediatek: cmdq: Remove timeout handler in
helper function
On 27/11/2020 15:42, Chun-Kuang Hu wrote:
> Hi, Matthias:
>
> Matthias Brugger <matthias.bgg@...il.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@...il.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@...nel.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@...nel.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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