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Message-ID: <4c00864c-a706-d73b-a8fb-e8e473db3f79@gmail.com>
Date: Fri, 27 Nov 2020 13:40:12 +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
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.
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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