From: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org> To: Grygorii Strashko <grygorii.strashko-l0cyMroinI0@public.gmane.org>, hch-jcswGhMUV9g@public.gmane.org, m.szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org Cc: gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linux-acpi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, sudeep.holla-5wv7dgnIgG8@public.gmane.org, frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Subject: Re: [PATCH v2 0/7] Stop losing firmware-set DMA masks Date: Fri, 27 Jul 2018 11:55:35 +0100 [thread overview] Message-ID: <8b8ac841-5c4c-ae27-21d5-d7aaaf4c277c@arm.com> (raw) In-Reply-To: <c73bc8d2-b745-ff31-1949-7a59ab04ede6-l0cyMroinI0@public.gmane.org> Hi Grygorii, Thanks for the report. On 27/07/18 00:45, Grygorii Strashko wrote: [...] > With this series applied I can't boot TI ARM32 am574x-idk any more. > > And log output is full of "DMA mask not set" - That's somewhat expected - as the relevant commit message mentions, there will be bugs flushed out by this change, but the point is to fix them :) > nobody sets dma_mask for platform bus in case of OF boot :( Right, after a brief investigation, that one turns out to be nice and straightforward to explain and fix; I'll write up the patch shortly. [...] > [ 3.793493] ti-qspi 4b300000.qspi: dma_alloc_coherent failed, using PIO mode > [ 3.801088] Unable to handle kernel NULL pointer dereference at virtual address 00000080 [...] > [ 4.602777] [<c04d87a4>] (omap_dma_write) from [<c04d8dc0>] (omap_dma_start_desc+0x78/0x150) > [ 4.611258] [<c04d8d48>] (omap_dma_start_desc) from [<c04d9028>] (omap_dma_issue_pending+0x90/0x98) > [ 4.620347] r9:ed002780 r8:00000000 r7:00000010 r6:ee2bdd00 r5:ee2bdd4c r4:ee2bdd00 > [ 4.628130] [<c04d8f98>] (omap_dma_issue_pending) from [<c0608d1c>] (ti_qspi_dma_xfer+0x8c/0x13c) > [ 4.637039] r5:00000000 r4:ee7e1b28 > [ 4.640636] [<c0608c90>] (ti_qspi_dma_xfer) from [<c06090b0>] (ti_qspi_exec_mem_op+0x2e4/0x32c) Hooray, a real bug! Since dma_alloc_coherent() could have failed due to lack of memory or any other reason, that's not even directly related to this change, we've simply helped uncover it. I guess that PIO fallback path hasn't been tested recently, because it clearly doesn't work. It would be good if someone who knows the ti-qspi driver and has the means to test it could figure that one out before also adding the missing dma_set_coherent_mask() call. Robin.
WARNING: multiple messages have this Message-ID (diff)
From: robin.murphy@arm.com (Robin Murphy) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 0/7] Stop losing firmware-set DMA masks Date: Fri, 27 Jul 2018 11:55:35 +0100 [thread overview] Message-ID: <8b8ac841-5c4c-ae27-21d5-d7aaaf4c277c@arm.com> (raw) In-Reply-To: <c73bc8d2-b745-ff31-1949-7a59ab04ede6@ti.com> Hi Grygorii, Thanks for the report. On 27/07/18 00:45, Grygorii Strashko wrote: [...] > With this series applied I can't boot TI ARM32 am574x-idk any more. > > And log output is full of "DMA mask not set" - That's somewhat expected - as the relevant commit message mentions, there will be bugs flushed out by this change, but the point is to fix them :) > nobody sets dma_mask for platform bus in case of OF boot :( Right, after a brief investigation, that one turns out to be nice and straightforward to explain and fix; I'll write up the patch shortly. [...] > [ 3.793493] ti-qspi 4b300000.qspi: dma_alloc_coherent failed, using PIO mode > [ 3.801088] Unable to handle kernel NULL pointer dereference at virtual address 00000080 [...] > [ 4.602777] [<c04d87a4>] (omap_dma_write) from [<c04d8dc0>] (omap_dma_start_desc+0x78/0x150) > [ 4.611258] [<c04d8d48>] (omap_dma_start_desc) from [<c04d9028>] (omap_dma_issue_pending+0x90/0x98) > [ 4.620347] r9:ed002780 r8:00000000 r7:00000010 r6:ee2bdd00 r5:ee2bdd4c r4:ee2bdd00 > [ 4.628130] [<c04d8f98>] (omap_dma_issue_pending) from [<c0608d1c>] (ti_qspi_dma_xfer+0x8c/0x13c) > [ 4.637039] r5:00000000 r4:ee7e1b28 > [ 4.640636] [<c0608c90>] (ti_qspi_dma_xfer) from [<c06090b0>] (ti_qspi_exec_mem_op+0x2e4/0x32c) Hooray, a real bug! Since dma_alloc_coherent() could have failed due to lack of memory or any other reason, that's not even directly related to this change, we've simply helped uncover it. I guess that PIO fallback path hasn't been tested recently, because it clearly doesn't work. It would be good if someone who knows the ti-qspi driver and has the means to test it could figure that one out before also adding the missing dma_set_coherent_mask() call. Robin.
next prev parent reply other threads:[~2018-07-27 10:55 UTC|newest] Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-07-23 22:16 [PATCH v2 0/7] Stop losing firmware-set DMA masks Robin Murphy 2018-07-23 22:16 ` Robin Murphy 2018-07-23 22:16 ` [PATCH v2 1/7] ACPI/IORT: Support address size limit for root complexes Robin Murphy 2018-07-23 22:16 ` Robin Murphy 2018-07-23 22:16 ` [PATCH v2 2/7] dma-mapping: Generalise dma_32bit_limit flag Robin Murphy 2018-07-23 22:16 ` Robin Murphy [not found] ` <c1720f0181b66f711e4097d85149757b16a7b0a7.1532382222.git.robin.murphy-5wv7dgnIgG8@public.gmane.org> 2018-07-25 11:29 ` Christoph Hellwig 2018-07-25 11:29 ` Christoph Hellwig 2018-07-27 17:45 ` Grygorii Strashko via iommu 2018-07-27 17:45 ` Grygorii Strashko [not found] ` <7872d914-8ea7-06e4-4a0c-489023e098d6-l0cyMroinI0@public.gmane.org> 2018-07-27 20:11 ` Robin Murphy 2018-07-27 20:11 ` Robin Murphy [not found] ` <5354ef69-c54e-170b-62d4-5110dc60aa8f-5wv7dgnIgG8@public.gmane.org> 2018-07-27 20:41 ` Grygorii Strashko via iommu 2018-07-27 20:41 ` Grygorii Strashko 2018-07-23 22:16 ` [PATCH v2 3/7] ACPI/IORT: Set bus DMA mask as appropriate Robin Murphy 2018-07-23 22:16 ` Robin Murphy [not found] ` <07cbf8f77fac552dca9b4c85a9d3bd8ed5a4cd29.1532382222.git.robin.murphy-5wv7dgnIgG8@public.gmane.org> 2018-07-25 11:29 ` Christoph Hellwig 2018-07-25 11:29 ` Christoph Hellwig 2018-07-25 13:16 ` Lorenzo Pieralisi 2018-07-25 13:16 ` Lorenzo Pieralisi 2018-07-23 22:16 ` [PATCH v2 4/7] of/device: " Robin Murphy 2018-07-23 22:16 ` Robin Murphy [not found] ` <cc56f074b8da7e03a187b2363b1f2c2955d62c1c.1532382222.git.robin.murphy-5wv7dgnIgG8@public.gmane.org> 2018-07-25 11:30 ` Christoph Hellwig 2018-07-25 11:30 ` Christoph Hellwig 2018-07-23 22:16 ` [PATCH v2 5/7] iommu/dma: Respect bus DMA limit for IOVAs Robin Murphy 2018-07-23 22:16 ` Robin Murphy [not found] ` <d370670edae9c9c537a5280c5e7c96bf3ec7ed8f.1532382222.git.robin.murphy-5wv7dgnIgG8@public.gmane.org> 2018-07-26 8:58 ` Christoph Hellwig 2018-07-26 8:58 ` Christoph Hellwig 2018-07-23 22:16 ` [PATCH v2 6/7] ACPI/IORT: Don't set default coherent DMA mask Robin Murphy 2018-07-23 22:16 ` Robin Murphy [not found] ` <3525869e8e7530128bf9718ae8af7d7564b3c684.1532382222.git.robin.murphy-5wv7dgnIgG8@public.gmane.org> 2018-07-25 15:27 ` Lorenzo Pieralisi 2018-07-25 15:27 ` Lorenzo Pieralisi 2018-07-25 15:43 ` Robin Murphy 2018-07-25 15:43 ` Robin Murphy 2018-07-23 22:16 ` [PATCH v2 7/7] OF: " Robin Murphy 2018-07-23 22:16 ` Robin Murphy [not found] ` <66c08e4df2032fde82a2f97544f41fd3a2f24a94.1532382222.git.robin.murphy-5wv7dgnIgG8@public.gmane.org> 2018-07-26 23:52 ` Grygorii Strashko via iommu 2018-07-26 23:52 ` Grygorii Strashko 2018-07-27 0:22 ` Grygorii Strashko 2018-07-27 0:22 ` Grygorii Strashko [not found] ` <92d6b010-b5c0-fc59-0668-5b455e26c912-l0cyMroinI0@public.gmane.org> 2018-07-27 11:36 ` Robin Murphy 2018-07-27 11:36 ` Robin Murphy 2018-07-27 17:34 ` Grygorii Strashko 2018-07-27 17:34 ` Grygorii Strashko [not found] ` <108a6254-1257-5daf-deaa-69bc4db2ec77-l0cyMroinI0@public.gmane.org> 2018-07-27 19:46 ` Robin Murphy 2018-07-27 19:46 ` Robin Murphy [not found] ` <c7a9c7ae-1f4a-af9d-df78-1f48bb5c28a5-5wv7dgnIgG8@public.gmane.org> 2018-07-27 18:13 ` Russell King - ARM Linux 2018-07-27 18:13 ` Russell King - ARM Linux [not found] ` <20180727181302.GC17271-l+eeeJia6m9URfEZ8mYm6t73F7V6hmMc@public.gmane.org> 2018-07-27 18:45 ` Grygorii Strashko via iommu 2018-07-27 18:45 ` Grygorii Strashko [not found] ` <affa2718-5f3a-7439-db25-ce171a99414a-l0cyMroinI0@public.gmane.org> 2018-07-27 20:42 ` Robin Murphy 2018-07-27 20:42 ` Robin Murphy 2018-07-27 19:29 ` Robin Murphy 2018-07-27 19:29 ` Robin Murphy 2018-07-26 23:45 ` [PATCH v2 0/7] Stop losing firmware-set DMA masks Grygorii Strashko 2018-07-26 23:45 ` Grygorii Strashko [not found] ` <c73bc8d2-b745-ff31-1949-7a59ab04ede6-l0cyMroinI0@public.gmane.org> 2018-07-27 10:55 ` Robin Murphy [this message] 2018-07-27 10:55 ` Robin Murphy [not found] ` <8b8ac841-5c4c-ae27-21d5-d7aaaf4c277c-5wv7dgnIgG8@public.gmane.org> 2018-07-27 17:22 ` Grygorii Strashko via iommu 2018-07-27 17:22 ` Grygorii Strashko [not found] ` <cover.1532382222.git.robin.murphy-5wv7dgnIgG8@public.gmane.org> 2018-07-25 11:31 ` Christoph Hellwig 2018-07-25 11:31 ` Christoph Hellwig [not found] ` <20180725113122.GD24736-jcswGhMUV9g@public.gmane.org> 2018-07-25 12:11 ` Joerg Roedel 2018-07-25 12:11 ` Joerg Roedel 2018-07-25 12:12 ` Robin Murphy 2018-07-25 12:12 ` Robin Murphy [not found] ` <5e036ade-db0b-f628-a4a0-6d014d1d76c8-5wv7dgnIgG8@public.gmane.org> 2018-07-25 12:17 ` Will Deacon 2018-07-25 12:17 ` Will Deacon 2018-07-25 13:58 ` Ard Biesheuvel 2018-07-25 13:58 ` Ard Biesheuvel 2018-07-26 9:00 ` Christoph Hellwig 2018-07-26 9:00 ` Christoph Hellwig 2018-07-29 12:32 ` Arnd Bergmann 2018-07-29 12:32 ` Arnd Bergmann [not found] ` <CAK8P3a3HDJ6svNN_cwvegxu20yNv8+tvc0D1A6Ooeq8agawbFg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2018-07-31 11:24 ` Robin Murphy 2018-07-31 11:24 ` Robin Murphy [not found] ` <1ccccc4b-7d4c-a3ee-23a2-f108916705e9-5wv7dgnIgG8@public.gmane.org> 2018-08-06 10:01 ` Arnd Bergmann 2018-08-06 10:01 ` Arnd Bergmann [not found] ` <CAK8P3a3ZcOeHMR_qFnsBdXED+2X8_AEMKoS5MeAQhbapbGmm9w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2018-08-06 12:13 ` Christoph Hellwig 2018-08-06 12:13 ` Christoph Hellwig [not found] ` <20180806121334.GA5340-jcswGhMUV9g@public.gmane.org> 2018-08-06 12:13 ` Arnd Bergmann 2018-08-06 12:13 ` Arnd Bergmann
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