From: Tudor Ambarus <tudor.ambarus@microchip.com> To: <ludovic.desroches@microchip.com>, <vkoul@kernel.org>, <richard.genoud@gmail.com>, <gregkh@linuxfoundation.org>, <jirislaby@kernel.org> Cc: <nicolas.ferre@microchip.com>, <alexandre.belloni@bootlin.com>, <mripard@kernel.org>, <linux-arm-kernel@lists.infradead.org>, <dmaengine@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-serial@vger.kernel.org>, Tudor Ambarus <tudor.ambarus@microchip.com> Subject: [PATCH v2 00/13] dmaengine: at_xdmac: Various fixes Date: Thu, 25 Nov 2021 11:00:15 +0200 [thread overview] Message-ID: <20211125090028.786832-1-tudor.ambarus@microchip.com> (raw) Bugs identified when debugging a hang encountered when operating an octal DTR SPI NOR memory. The culprit was the flash, not the DMA driver, so all these bugs are not experienced in real life, they are all theoretical fixes. Nevertheless the bugs are there and I think they should be squashed. If all of you consider that all these are worthy to be applied, I would suggest that all the patches to be taken via an immutable branch of the DMA tree. The serial patches depend on the first patch in the series. The DMA transactions are no longer started at tx_submit() level, but at device_issue_pending() level, as the DMA API requires. The atmel serial driver wrongly assumed that the DMA transactions are started at tx_submit() level and never called dma_async_issue_pending(). Applying first patch, but not the atmel_serial patches will break atmel_serial when using DMA. Tested the serial with DMA on sama5d2_xplained. Tested QSPI with DMA on sama7g5ek. All went well. v2: - drop local chan_rx local variable in patch 3/13, focus just on fixes for now. - collect Richard's Acked-by tag. - add details in the cover letter about what tests were performed. Tudor Ambarus (13): dmaengine: at_xdmac: Don't start transactions at tx_submit level tty: serial: atmel: Check return code of dmaengine_submit() tty: serial: atmel: Call dma_async_issue_pending() dmaengine: at_xdmac: Start transfer for cyclic channels in issue_pending dmaengine: at_xdmac: Print debug message after realeasing the lock dmaengine: at_xdmac: Fix concurrency over chan's completed_cookie dmaengine: at_xdmac: Fix race for the tx desc callback dmaengine: at_xdmac: Move the free desc to the tail of the desc list dmaengine: at_xdmac: Fix concurrency over xfers_list dmaengine: at_xdmac: Remove a level of indentation in at_xdmac_advance_work() dmaengine: at_xdmac: Fix lld view setting dmaengine: at_xdmac: Fix at_xdmac_lld struct definition dmaengine: at_xdmac: Fix race over irq_status drivers/dma/at_xdmac.c | 186 ++++++++++++++---------------- drivers/tty/serial/atmel_serial.c | 14 +++ 2 files changed, 101 insertions(+), 99 deletions(-) -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Tudor Ambarus <tudor.ambarus@microchip.com> To: <ludovic.desroches@microchip.com>, <vkoul@kernel.org>, <richard.genoud@gmail.com>, <gregkh@linuxfoundation.org>, <jirislaby@kernel.org> Cc: alexandre.belloni@bootlin.com, Tudor Ambarus <tudor.ambarus@microchip.com>, mripard@kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 00/13] dmaengine: at_xdmac: Various fixes Date: Thu, 25 Nov 2021 11:00:15 +0200 [thread overview] Message-ID: <20211125090028.786832-1-tudor.ambarus@microchip.com> (raw) Bugs identified when debugging a hang encountered when operating an octal DTR SPI NOR memory. The culprit was the flash, not the DMA driver, so all these bugs are not experienced in real life, they are all theoretical fixes. Nevertheless the bugs are there and I think they should be squashed. If all of you consider that all these are worthy to be applied, I would suggest that all the patches to be taken via an immutable branch of the DMA tree. The serial patches depend on the first patch in the series. The DMA transactions are no longer started at tx_submit() level, but at device_issue_pending() level, as the DMA API requires. The atmel serial driver wrongly assumed that the DMA transactions are started at tx_submit() level and never called dma_async_issue_pending(). Applying first patch, but not the atmel_serial patches will break atmel_serial when using DMA. Tested the serial with DMA on sama5d2_xplained. Tested QSPI with DMA on sama7g5ek. All went well. v2: - drop local chan_rx local variable in patch 3/13, focus just on fixes for now. - collect Richard's Acked-by tag. - add details in the cover letter about what tests were performed. Tudor Ambarus (13): dmaengine: at_xdmac: Don't start transactions at tx_submit level tty: serial: atmel: Check return code of dmaengine_submit() tty: serial: atmel: Call dma_async_issue_pending() dmaengine: at_xdmac: Start transfer for cyclic channels in issue_pending dmaengine: at_xdmac: Print debug message after realeasing the lock dmaengine: at_xdmac: Fix concurrency over chan's completed_cookie dmaengine: at_xdmac: Fix race for the tx desc callback dmaengine: at_xdmac: Move the free desc to the tail of the desc list dmaengine: at_xdmac: Fix concurrency over xfers_list dmaengine: at_xdmac: Remove a level of indentation in at_xdmac_advance_work() dmaengine: at_xdmac: Fix lld view setting dmaengine: at_xdmac: Fix at_xdmac_lld struct definition dmaengine: at_xdmac: Fix race over irq_status drivers/dma/at_xdmac.c | 186 ++++++++++++++---------------- drivers/tty/serial/atmel_serial.c | 14 +++ 2 files changed, 101 insertions(+), 99 deletions(-) -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2021-11-25 9:02 UTC|newest] Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-11-25 9:00 Tudor Ambarus [this message] 2021-11-25 9:00 ` [PATCH v2 00/13] dmaengine: at_xdmac: Various fixes Tudor Ambarus 2021-11-25 9:00 ` [PATCH v2 01/13] dmaengine: at_xdmac: Don't start transactions at tx_submit level Tudor Ambarus 2021-11-25 9:00 ` Tudor Ambarus 2021-11-25 9:00 ` [PATCH v2 02/13] tty: serial: atmel: Check return code of dmaengine_submit() Tudor Ambarus 2021-11-25 9:00 ` Tudor Ambarus 2021-11-25 9:00 ` [PATCH v2 03/13] tty: serial: atmel: Call dma_async_issue_pending() Tudor Ambarus 2021-11-25 9:00 ` Tudor Ambarus 2021-11-25 9:00 ` [PATCH v2 04/13] dmaengine: at_xdmac: Start transfer for cyclic channels in issue_pending Tudor Ambarus 2021-11-25 9:00 ` Tudor Ambarus 2021-11-25 9:00 ` [PATCH v2 05/13] dmaengine: at_xdmac: Print debug message after realeasing the lock Tudor Ambarus 2021-11-25 9:00 ` Tudor Ambarus 2021-11-25 9:00 ` [PATCH v2 06/13] dmaengine: at_xdmac: Fix concurrency over chan's completed_cookie Tudor Ambarus 2021-11-25 9:00 ` Tudor Ambarus 2021-11-25 9:00 ` [PATCH v2 07/13] dmaengine: at_xdmac: Fix race for the tx desc callback Tudor Ambarus 2021-11-25 9:00 ` Tudor Ambarus 2021-11-25 9:00 ` [PATCH v2 08/13] dmaengine: at_xdmac: Move the free desc to the tail of the desc list Tudor Ambarus 2021-11-25 9:00 ` Tudor Ambarus 2021-12-13 8:07 ` Vinod Koul 2021-12-13 8:07 ` Vinod Koul 2021-12-13 8:51 ` Tudor.Ambarus 2021-12-13 8:51 ` Tudor.Ambarus 2021-12-13 8:59 ` Vinod Koul 2021-12-13 8:59 ` Vinod Koul 2021-12-13 9:00 ` Vinod Koul 2021-12-13 9:00 ` Vinod Koul 2021-12-13 9:22 ` Tudor.Ambarus 2021-12-13 9:22 ` Tudor.Ambarus 2021-12-13 9:27 ` Tudor.Ambarus 2021-12-13 9:27 ` Tudor.Ambarus 2021-11-25 9:00 ` [PATCH v2 09/13] dmaengine: at_xdmac: Fix concurrency over xfers_list Tudor Ambarus 2021-11-25 9:00 ` Tudor Ambarus 2021-11-25 9:00 ` [PATCH v2 10/13] dmaengine: at_xdmac: Remove a level of indentation in at_xdmac_advance_work() Tudor Ambarus 2021-11-25 9:00 ` Tudor Ambarus 2021-11-25 9:00 ` [PATCH v2 11/13] dmaengine: at_xdmac: Fix lld view setting Tudor Ambarus 2021-11-25 9:00 ` Tudor Ambarus 2021-11-25 9:00 ` [PATCH v2 12/13] dmaengine: at_xdmac: Fix at_xdmac_lld struct definition Tudor Ambarus 2021-11-25 9:00 ` Tudor Ambarus 2021-11-25 9:00 ` [PATCH v2 13/13] dmaengine: at_xdmac: Fix race over irq_status Tudor Ambarus 2021-11-25 9:00 ` Tudor Ambarus
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