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","To":"Frank.Li@nxp.com,\n\tdave.jiang@intel.com,\n\tntb@lists.linux.dev,\n\tlinux-pci@vger.kernel.org,\n\tdmaengine@vger.kernel.org,\n\tlinux-renesas-soc@vger.kernel.org,\n\tnetdev@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org","Cc":"mani@kernel.org,\n\tkwilczynski@kernel.org,\n\tkishon@kernel.org,\n\tbhelgaas@google.com,\n\tcorbet@lwn.net,\n\tgeert+renesas@glider.be,\n\tmagnus.damm@gmail.com,\n\trobh@kernel.org,\n\tkrzk+dt@kernel.org,\n\tconor+dt@kernel.org,\n\tvkoul@kernel.org,\n\tjoro@8bytes.org,\n\twill@kernel.org,\n\trobin.murphy@arm.com,\n\tjdmason@kudzu.us,\n\tallenbh@gmail.com,\n\tandrew+netdev@lunn.ch,\n\tdavem@davemloft.net,\n\tedumazet@google.com,\n\tkuba@kernel.org,\n\tpabeni@redhat.com,\n\tBasavaraj.Natikar@amd.com,\n\tShyam-sundar.S-k@amd.com,\n\tkurt.schwemmer@microsemi.com,\n\tlogang@deltatee.com,\n\tjingoohan1@gmail.com,\n\tlpieralisi@kernel.org,\n\tutkarsh02t@gmail.com,\n\tjbrunet@baylibre.com,\n\tdlemoal@kernel.org,\n\tarnd@arndb.de,\n\telfring@users.sourceforge.net,\n\tden@valinux.co.jp","Subject":"[RFC PATCH v3 19/35] dmaengine: dw-edma: Poll completion when local\n IRQ handling is disabled","Date":"Thu, 18 Dec 2025 00:15:53 +0900","Message-ID":"<20251217151609.3162665-20-den@valinux.co.jp>","X-Mailer":"git-send-email 2.51.0","In-Reply-To":"<20251217151609.3162665-1-den@valinux.co.jp>","References":"<20251217151609.3162665-1-den@valinux.co.jp>","Content-Transfer-Encoding":"8bit","Content-Type":"text/plain","X-ClientProxiedBy":"TYCP286CA0036.JPNP286.PROD.OUTLOOK.COM\n (2603:1096:400:29d::20) To TYWP286MB2697.JPNP286.PROD.OUTLOOK.COM\n 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6d74163c-de22-4c25-c9ac-08de3d7f419b","X-MS-Exchange-CrossTenant-AuthSource":"TYWP286MB2697.JPNP286.PROD.OUTLOOK.COM","X-MS-Exchange-CrossTenant-AuthAs":"Internal","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"17 Dec 2025 15:16:30.4752\n (UTC)","X-MS-Exchange-CrossTenant-FromEntityHeader":"Hosted","X-MS-Exchange-CrossTenant-Id":"7a57bee8-f73d-4c5f-a4f7-d72c91c8c111","X-MS-Exchange-CrossTenant-MailboxType":"HOSTED","X-MS-Exchange-CrossTenant-UserPrincipalName":"\n +x7B5+xRqtBusGu5r7rTgBc6gaxBmwECwu9v2b+5DsS8NZnV//+pdv0LVZz0e5uzG9kPAnuLo8JqGW8LVmITkA==","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"TYCP286MB2863"},"content":"When a channel is configured to suppress host side interruption (RIE=0),\nthe host side driver cannot rely on IRQ-driven progress. Add an optional\npolling path for such channels. Polling is only enabled for channels where\ndw_edma_chan_ignore_irq() is true.\n\nSigned-off-by: Koichiro Den \n---\n drivers/dma/dw-edma/dw-edma-core.c | 97 ++++++++++++++++++++++++------\n drivers/dma/dw-edma/dw-edma-core.h | 4 ++\n 2 files changed, 84 insertions(+), 17 deletions(-)","diff":"diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c\nindex 0bceca2d56c5..09b10ad1f38a 100644\n--- a/drivers/dma/dw-edma/dw-edma-core.c\n+++ b/drivers/dma/dw-edma/dw-edma-core.c\n@@ -303,23 +303,6 @@ static int dw_edma_device_terminate_all(struct dma_chan *dchan)\n \treturn err;\n }\n \n-static void dw_edma_device_issue_pending(struct dma_chan *dchan)\n-{\n-\tstruct dw_edma_chan *chan = dchan2dw_edma_chan(dchan);\n-\tunsigned long flags;\n-\n-\tif (!chan->configured)\n-\t\treturn;\n-\n-\tspin_lock_irqsave(&chan->vc.lock, flags);\n-\tif (vchan_issue_pending(&chan->vc) && chan->request == EDMA_REQ_NONE &&\n-\t chan->status == EDMA_ST_IDLE) {\n-\t\tchan->status = EDMA_ST_BUSY;\n-\t\tdw_edma_start_transfer(chan);\n-\t}\n-\tspin_unlock_irqrestore(&chan->vc.lock, flags);\n-}\n-\n static enum dma_status\n dw_edma_device_tx_status(struct dma_chan *dchan, dma_cookie_t cookie,\n \t\t\t struct dma_tx_state *txstate)\n@@ -707,6 +690,68 @@ static irqreturn_t dw_edma_interrupt_common(int irq, void *data)\n \treturn ret;\n }\n \n+static void dw_edma_done_arm(struct dw_edma_chan *chan)\n+{\n+\tif (!dw_edma_chan_ignore_irq(&chan->vc.chan))\n+\t\t/* no need to arm since it's not to be ignored */\n+\t\treturn;\n+\n+\tqueue_delayed_work(system_wq, &chan->poll_work, 1);\n+}\n+\n+static void dw_edma_chan_poll_done(struct dma_chan *dchan)\n+{\n+\tstruct dw_edma_chan *chan = dchan2dw_edma_chan(dchan);\n+\tenum dma_status st;\n+\n+\tif (!dw_edma_chan_ignore_irq(dchan))\n+\t\t/* no need to poll since it's not to be ignored */\n+\t\treturn;\n+\n+\tguard(spinlock_irqsave)(&chan->poll_lock);\n+\n+\tif (chan->status != EDMA_ST_BUSY)\n+\t\treturn;\n+\n+\tst = dw_edma_core_ch_status(chan);\n+\n+\tswitch (st) {\n+\tcase DMA_COMPLETE:\n+\t\tdw_edma_done_interrupt(chan);\n+\t\tif (chan->status == EDMA_ST_BUSY)\n+\t\t\tdw_edma_done_arm(chan);\n+\t\tbreak;\n+\tcase DMA_IN_PROGRESS:\n+\t\tdw_edma_done_arm(chan);\n+\t\tbreak;\n+\tcase DMA_ERROR:\n+\t\tdw_edma_abort_interrupt(chan);\n+\t\tbreak;\n+\tdefault:\n+\t\tbreak;\n+\t}\n+}\n+\n+static void dw_edma_device_issue_pending(struct dma_chan *dchan)\n+{\n+\tstruct dw_edma_chan *chan = dchan2dw_edma_chan(dchan);\n+\tunsigned long flags;\n+\n+\tif (!chan->configured)\n+\t\treturn;\n+\n+\tdw_edma_chan_poll_done(dchan);\n+\n+\tspin_lock_irqsave(&chan->vc.lock, flags);\n+\tif (vchan_issue_pending(&chan->vc) && chan->request == EDMA_REQ_NONE &&\n+\t chan->status == EDMA_ST_IDLE) {\n+\t\tchan->status = EDMA_ST_BUSY;\n+\t\tdw_edma_start_transfer(chan);\n+\t} else\n+\t\tdw_edma_done_arm(chan);\n+\tspin_unlock_irqrestore(&chan->vc.lock, flags);\n+}\n+\n static int dw_edma_alloc_chan_resources(struct dma_chan *dchan)\n {\n \tstruct dw_edma_chan *chan = dchan2dw_edma_chan(dchan);\n@@ -1060,6 +1105,19 @@ int dw_edma_remove(struct dw_edma_chip *chip)\n }\n EXPORT_SYMBOL_GPL(dw_edma_remove);\n \n+static void dw_edma_poll_work(struct work_struct *work)\n+{\n+\tstruct delayed_work *dwork = to_delayed_work(work);\n+\tstruct dw_edma_chan *chan =\n+\t\tcontainer_of(dwork, struct dw_edma_chan, poll_work);\n+\tstruct dma_chan *dchan = &chan->vc.chan;\n+\n+\tif (!chan->configured)\n+\t\treturn;\n+\n+\tdw_edma_chan_poll_done(dchan);\n+}\n+\n int dw_edma_chan_irq_config(struct dma_chan *dchan,\n \t\t\t enum dw_edma_ch_irq_mode mode)\n {\n@@ -1083,6 +1141,11 @@ int dw_edma_chan_irq_config(struct dma_chan *dchan,\n \t\t str_write_read(chan->dir == EDMA_DIR_WRITE),\n \t\t chan->id, mode);\n \n+\tif (dw_edma_chan_ignore_irq(&chan->vc.chan)) {\n+\t\tspin_lock_init(&chan->poll_lock);\n+\t\tINIT_DELAYED_WORK(&chan->poll_work, dw_edma_poll_work);\n+\t}\n+\n \treturn 0;\n }\n EXPORT_SYMBOL_GPL(dw_edma_chan_irq_config);\ndiff --git a/drivers/dma/dw-edma/dw-edma-core.h b/drivers/dma/dw-edma/dw-edma-core.h\nindex 8458d676551a..11fe4532f0bf 100644\n--- a/drivers/dma/dw-edma/dw-edma-core.h\n+++ b/drivers/dma/dw-edma/dw-edma-core.h\n@@ -11,6 +11,7 @@\n \n #include \n #include \n+#include \n \n #include \"../virt-dma.h\"\n \n@@ -83,6 +84,9 @@ struct dw_edma_chan {\n \n \tenum dw_edma_ch_irq_mode\tirq_mode;\n \n+\tstruct delayed_work\t\tpoll_work;\n+\tspinlock_t\t\t\tpoll_lock;\n+\n \tenum dw_edma_request\t\trequest;\n \tenum dw_edma_status\t\tstatus;\n \tu8\t\t\t\tconfigured;\n","prefixes":["RFC","v3","19/35"]}