[PATCH v1 0/2] Revert "mailbox: mediatek: remove implementation related to atomic_exec"

[PATCH v1 0/2] Revert "mailbox: mediatek: remove implementation related to atomic_exec"

[Yongqiang Niu]

This series base linux 5.12-rc1
these two patches will cause home ui flick when cursor moved,
there is no fix solution yet, revert these patches first.

Yongqiang Niu (2):
  Revert "drm/mediatek: Make sure previous message done or be aborted
    before send"
  Revert "mailbox: mediatek: remove implementation related to
    atomic_exec"

 drivers/gpu/drm/mediatek/mtk_drm_crtc.c |  1 -
 drivers/mailbox/mtk-cmdq-mailbox.c      | 80 +++++++++++++++++++++++++++++----
 2 files changed, 71 insertions(+), 10 deletions(-)

-- 
1.8.1.1.dirty
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[PATCH v1 1/2] Revert "drm/mediatek: Make sure previous message done or be aborted before send"

[Yongqiang Niu]

This reverts commit 839cbf0531428f3f9535077a461b8631359c1165.

Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 8b0de90..c76f446 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -463,7 +463,6 @@ static void mtk_drm_crtc_hw_config(struct mtk_drm_crtc *mtk_crtc)
 	}
 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
 	if (mtk_crtc->cmdq_client) {
-		mbox_flush(mtk_crtc->cmdq_client->chan, 2000);
 		cmdq_handle = cmdq_pkt_create(mtk_crtc->cmdq_client, PAGE_SIZE);
 		cmdq_pkt_clear_event(cmdq_handle, mtk_crtc->cmdq_event);
 		cmdq_pkt_wfe(cmdq_handle, mtk_crtc->cmdq_event, false);
-- 
1.8.1.1.dirty
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[PATCH v1 2/2] Revert "mailbox: mediatek: remove implementation related to atomic_exec"

[Yongqiang Niu]

This reverts commit c9ea564f3d9dd20d88bd34f40a6ff6d31a0d7e8c.

Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com
---
 drivers/mailbox/mtk-cmdq-mailbox.c | 80 +++++++++++++++++++++++++++++++++-----
 1 file changed, 71 insertions(+), 9 deletions(-)

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index 5665b6e..1eac05f 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -56,6 +56,7 @@ struct cmdq_thread {
 	void __iomem		*base;
 	struct list_head	task_busy_list;
 	u32			priority;
+	bool			atomic_exec;
 };
 
 struct cmdq_task {
@@ -168,18 +169,56 @@ static void cmdq_task_insert_into_thread(struct cmdq_task *task)
 	dma_sync_single_for_cpu(dev, prev_task->pa_base,
 				prev_task->pkt->cmd_buf_size, DMA_TO_DEVICE);
 	prev_task_base[CMDQ_NUM_CMD(prev_task->pkt) - 1] =
-		(u64)CMDQ_JUMP_BY_PA << 32 | task->pa_base;
+		(u64)CMDQ_JUMP_BY_PA << 32 |
+		(task->pa_base >> cmdq->shift_pa);
 	dma_sync_single_for_device(dev, prev_task->pa_base,
 				   prev_task->pkt->cmd_buf_size, DMA_TO_DEVICE);
 
 	cmdq_thread_invalidate_fetched_data(thread);
 }
 
+static bool cmdq_command_is_wfe(u64 cmd)
+{
+	u64 wfe_option = CMDQ_WFE_UPDATE | CMDQ_WFE_WAIT | CMDQ_WFE_WAIT_VALUE;
+	u64 wfe_op = (u64)(CMDQ_CODE_WFE << CMDQ_OP_CODE_SHIFT) << 32;
+	u64 wfe_mask = (u64)CMDQ_OP_CODE_MASK << 32 | 0xffffffff;
+
+	return ((cmd & wfe_mask) == (wfe_op | wfe_option));
+}
+
+/* we assume tasks in the same display GCE thread are waiting the same event. */
+static void cmdq_task_remove_wfe(struct cmdq_task *task)
+{
+	struct device *dev = task->cmdq->mbox.dev;
+	u64 *base = task->pkt->va_base;
+	int i;
+
+	dma_sync_single_for_cpu(dev, task->pa_base, task->pkt->cmd_buf_size,
+				DMA_TO_DEVICE);
+	for (i = 0; i < CMDQ_NUM_CMD(task->pkt); i++)
+		if (cmdq_command_is_wfe(base[i]))
+			base[i] = (u64)CMDQ_JUMP_BY_OFFSET << 32 |
+				  (CMDQ_JUMP_PASS >> task->cmdq->shift_pa);
+	dma_sync_single_for_device(dev, task->pa_base, task->pkt->cmd_buf_size,
+				   DMA_TO_DEVICE);
+}
+
 static bool cmdq_thread_is_in_wfe(struct cmdq_thread *thread)
 {
 	return readl(thread->base + CMDQ_THR_WAIT_TOKEN) & CMDQ_THR_IS_WAITING;
 }
 
+static void cmdq_thread_wait_end(struct cmdq_thread *thread,
+				 unsigned long end_pa)
+{
+	struct device *dev = thread->chan->mbox->dev;
+	unsigned long curr_pa;
+
+	if (readl_poll_timeout_atomic(thread->base + CMDQ_THR_CURR_ADDR,
+			curr_pa, curr_pa == end_pa, 1, 20))
+		dev_err(dev, "GCE thread cannot run to end.\n");
+}
+
 static void cmdq_task_exec_done(struct cmdq_task *task, enum cmdq_cb_status sta)
 {
 	struct cmdq_task_cb *cb = &task->pkt->async_cb;
@@ -371,15 +410,37 @@ static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data)
 			cmdq->shift_pa;
 		end_pa = readl(thread->base + CMDQ_THR_END_ADDR) <<
 			cmdq->shift_pa;
-		/* check boundary */
-		if (curr_pa == end_pa - CMDQ_INST_SIZE ||
-		    curr_pa == end_pa) {
-			/* set to this task directly */
-			writel(task->pa_base >> cmdq->shift_pa,
-			       thread->base + CMDQ_THR_CURR_ADDR);
+
+		/*
+		 * Atomic execution should remove the following wfe, i.e. only
+		 * wait event at first task, and prevent to pause when running.
+		 */
+		if (thread->atomic_exec) {
+			/* GCE is executing if command is not WFE */
+			if (!cmdq_thread_is_in_wfe(thread)) {
+				cmdq_thread_resume(thread);
+				cmdq_thread_wait_end(thread,
+						     end_pa >> cmdq->shift_pa);
+				WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
+				/* set to this task directly */
+				writel(task->pa_base >> cmdq->shift_pa,
+				       thread->base + CMDQ_THR_CURR_ADDR);
+			} else {
+				cmdq_task_insert_into_thread(task);
+				cmdq_task_remove_wfe(task);
+				smp_mb(); /* modify jump before enable thread */
+			}
 		} else {
-			cmdq_task_insert_into_thread(task);
-			smp_mb(); /* modify jump before enable thread */
+			/* check boundary */
+			if (curr_pa == end_pa - CMDQ_INST_SIZE ||
+			    curr_pa == end_pa) {
+				/* set to this task directly */
+				writel(task->pa_base >> cmdq->shift_pa,
+				       thread->base + CMDQ_THR_CURR_ADDR);
+			} else {
+				cmdq_task_insert_into_thread(task);
+				smp_mb(); /* modify jump before enable thread */
+			}
 		}
 		writel((task->pa_base + pkt->cmd_buf_size) >> cmdq->shift_pa,
 		       thread->base + CMDQ_THR_END_ADDR);
@@ -500,6 +561,7 @@ static struct mbox_chan *cmdq_xlate(struct mbox_controller *mbox,
 
 	thread = (struct cmdq_thread *)mbox->chans[ind].con_priv;
 	thread->priority = sp->args[1];
+	thread->atomic_exec = (sp->args[2] != 0);
 	thread->chan = &mbox->chans[ind];
 
 	return &mbox->chans[ind];
-- 
1.8.1.1.dirty
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Re: [PATCH v1 2/2] Revert "mailbox: mediatek: remove implementation related to atomic_exec"

[kernel test robot]

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Hi Yongqiang,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.12-rc2 next-20210310]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Yongqiang-Niu/Revert-mailbox-mediatek-remove-implementation-related-to-atomic_exec/20210310-154512
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 05a59d79793d482f628a31753c671f2e92178a21
config: microblaze-randconfig-r011-20210308 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/876bcec7aee51ac5f6f0697523f91a72b85d6a5d
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Yongqiang-Niu/Revert-mailbox-mediatek-remove-implementation-related-to-atomic_exec/20210310-154512
        git checkout 876bcec7aee51ac5f6f0697523f91a72b85d6a5d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=microblaze 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   drivers/mailbox/mtk-cmdq-mailbox.c: In function 'cmdq_task_insert_into_thread':
>> drivers/mailbox/mtk-cmdq-mailbox.c:173:21: error: 'cmdq' undeclared (first use in this function)
     173 |   (task->pa_base >> cmdq->shift_pa);
         |                     ^~~~
   drivers/mailbox/mtk-cmdq-mailbox.c:173:21: note: each undeclared identifier is reported only once for each function it appears in


vim +/cmdq +173 drivers/mailbox/mtk-cmdq-mailbox.c

   159	
   160	static void cmdq_task_insert_into_thread(struct cmdq_task *task)
   161	{
   162		struct device *dev = task->cmdq->mbox.dev;
   163		struct cmdq_thread *thread = task->thread;
   164		struct cmdq_task *prev_task = list_last_entry(
   165				&thread->task_busy_list, typeof(*task), list_entry);
   166		u64 *prev_task_base = prev_task->pkt->va_base;
   167	
   168		/* let previous task jump to this task */
   169		dma_sync_single_for_cpu(dev, prev_task->pa_base,
   170					prev_task->pkt->cmd_buf_size, DMA_TO_DEVICE);
   171		prev_task_base[CMDQ_NUM_CMD(prev_task->pkt) - 1] =
   172			(u64)CMDQ_JUMP_BY_PA << 32 |
 > 173			(task->pa_base >> cmdq->shift_pa);
   174		dma_sync_single_for_device(dev, prev_task->pa_base,
   175					   prev_task->pkt->cmd_buf_size, DMA_TO_DEVICE);
   176	
   177		cmdq_thread_invalidate_fetched_data(thread);
   178	}
   179	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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