From: Irui Wang <irui.wang@mediatek.com> To: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>, houlong wei <houlong.wei@mediatek.com>, Alexandre Courbot <acourbot@chromium.org>, "Hans Verkuil" <hverkuil@xs4all.nl> Cc: "Linux Media Mailing List" <linux-media@vger.kernel.org>, "moderated list:ARM/Mediatek SoC support" <linux-mediatek@lists.infradead.org>, LKML <linux-kernel@vger.kernel.org>, "kernel@collabora.com" <kernel@collabora.com>, "Dafna Hirschfeld" <dafna3@gmail.com>, "Tiffany Lin (林慧珊)" <tiffany.lin@mediatek.com>, "Andrew-CT Chen (陳智迪)" <Andrew-CT.Chen@mediatek.com>, "Minghsiu Tsai (蔡明修)" <Minghsiu.Tsai@mediatek.com>, "Mauro Carvalho Chehab" <mchehab@kernel.org>, "Matthias Brugger" <matthias.bgg@gmail.com> Subject: Re: [PATCH v4] media: mtk-vpu: Ensure alignment of 8 for DTCM buffer Date: Wed, 10 Nov 2021 11:11:30 +0800 [thread overview] Message-ID: <054260428d9d7718f630ecc1b2bdec34ecf1f799.camel@mediatek.com> (raw) In-Reply-To: <428f216d-cdff-e22d-b96e-f9dd9cc158e3@collabora.com> Hi, Dafna, Thanks for the patch. On Tue, 2021-11-09 at 10:46 +0200, Dafna Hirschfeld wrote: > > On 03.11.21 13:04, Dafna Hirschfeld wrote: > > > > > > On 03.11.21 10:19, Irui Wang wrote: > > > Hi, > > > > > > The "len" of share_buf copied should be always 8 alignment; > > > do you have other logs to prove the len is not 8 alignment when > > > errors > > > appear? > > > > Hi, I found out that "sizeof(mdp_ipi_comm) = 20" > > this is due to the macro #pragma pack(push, 4) in mtk_mdp_ipi.h > > > > see [1] > > > > [1] http://lkml.iu.edu/hypermail/linux/kernel/2109.2/04978.html > > > > Hi Irui Wang, > Any update regarding that patch? > Can you give more explanation for that errors that we see > when the buffer size is not a multiple of 8? > > Thanks, > Dafna share_buf is a mapped memory by ioremap, it should be better use memcpy_to/fromio instead of memcpy because of alignment. As for memcpy_toio, it may also have requirements for alignment, we can also get such information from: https://elixir.bootlin.com/linux/v5.15/source/drivers/mtd/spi-nor/controllers/aspeed-smc.c#L207 . So, it's not VPU HW bug or limitation, it's memcpy_toio requirements, maybe we can modify IPI message to do alignment, but it need modify both kernel and vpu firmware, which will break upstream backward compatible, we think it's unacceptale. If this patch can solve the issue, we think it's OK. Thanks > > > Thanks, > > Dafna > > > > > > > [58.350841] mtk-mdp 14001000.rdma: processing failed: -22 > > > > > > On Wed, 2021-11-03 at 16:03 +0800, houlong wei wrote: > > > > Add mtk-vpu driver expert irui.wang in the loop. > > > > > > > > On Mon, 2021-10-18 at 15:07 +0800, Dafna Hirschfeld wrote: > > > > > > > > > > On 18.10.21 03:16, Alexandre Courbot wrote: > > > > > > Hi Hans! > > > > > > > > > > > > On Mon, Oct 4, 2021 at 6:37 PM Hans Verkuil < > > > > > > hverkuil@xs4all.nl> > > > > > > wrote: > > > > > > > > > > > > > > On 20/09/2021 19:04, Dafna Hirschfeld wrote: > > > > > > > > From: Alexandre Courbot <acourbot@chromium.org> > > > > > > > > > > > > > > > > When running memcpy_toio: > > > > > > > > memcpy_toio(send_obj->share_buf, buf, len); > > > > > > > > it was found that errors appear if len is not a > > > > > > > > multiple of > > > > > > > > 8: > > > > > > > > > > > > > > > > [58.350841] mtk-mdp 14001000.rdma: processing failed: > > > > > > > > -22 > > > > > > > > > > > > > > Why do errors appear? Is that due to a HW bug? Some other > > > > > > > reason? > > > > > > > > > > > > MTK folks would be the best placed to answer this, but > > > > > > since the > > > > > > failure is reported by the firmware I'd suspect either a > > > > > > firmware > > > > > > or > > > > > > hardware limitation. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > This patch ensures the copy of a multiple of 8 size by > > > > > > > > calling > > > > > > > > round_up(len, 8) when copying > > > > > > > > > > > > > > > > Fixes: e6599adfad30 ("media: mtk-vpu: avoid unaligned > > > > > > > > access > > > > > > > > to > > > > > > > > DTCM buffer.") > > > > > > > > Signed-off-by: Alexandre Courbot <acourbot@chromium.org > > > > > > > > > > > > > > > > > Signed-off-by: Enric Balletbo i Serra < > > > > > > > > enric.balletbo@collabora.com> > > > > > > > > Signed-off-by: Dafna Hirschfeld < > > > > > > > > dafna.hirschfeld@collabora.com > > > > > > > > > > > > > > > > > > > > > > > > > Reviewed-by: Houlong Wei <houlong.wei@mediatek.com> > > > > > > > > --- > > > > > > > > changes since v3: > > > > > > > > 1. multile -> multiple > > > > > > > > 2. add inline doc > > > > > > > > > > > > > > > > changes since v2: > > > > > > > > 1. do the extra copy only if len is not multiple of 8 > > > > > > > > > > > > > > > > changes since v1: > > > > > > > > 1. change sign-off-by tags > > > > > > > > 2. change values to memset > > > > > > > > > > > > > > > > drivers/media/platform/mtk-vpu/mtk_vpu.c | 15 > > > > > > > > ++++++++++++++- > > > > > > > > 1 file changed, 14 insertions(+), 1 deletion(-) > > > > > > > > > > > > > > > > diff --git a/drivers/media/platform/mtk-vpu/mtk_vpu.c > > > > > > > > b/drivers/media/platform/mtk-vpu/mtk_vpu.c > > > > > > > > index ec290dde59cf..1df031716c8f 100644 > > > > > > > > --- a/drivers/media/platform/mtk-vpu/mtk_vpu.c > > > > > > > > +++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c > > > > > > > > @@ -349,7 +349,20 @@ int vpu_ipi_send(struct > > > > > > > > platform_device > > > > > > > > *pdev, > > > > > > > > } > > > > > > > > } while (vpu_cfg_readl(vpu, HOST_TO_VPU)); > > > > > > > > > > > > > > > > - memcpy_toio(send_obj->share_buf, buf, len); > > > > > > > > + /* > > > > > > > > + * when copying data to the vpu hardware, the > > > > > > > > memcpy_toio > > > > > > > > operation must copy > > > > > > > > + * a multiple of 8. Otherwise the processing > > > > > > > > fails > > > > > > > > > > > > > > Same here: it needs to explain why the processing fails. > > > > > > > > > > Is writing 'due to hardware or firmware limitation' enough? > > > > > If not, then we should wait for mediatek people's response to > > > > > explain > > > > > if they know more > > > > > > > > > > > > > > > > > > > > + */ > > > > > > > > + if (len % 8 != 0) { > > > > > > > > + unsigned char data[SHARE_BUF_SIZE]; > > > > > > > > > > > > > > Wouldn't it be more robust if you say: > > > > > > > > > > > > > > unsigned char data[sizeof(send_obj- > > > > > > > > share_buf)]; > > > > > > > > > > > > Definitely yes. > > > > > > > > > > I'll send v5 fixing this > > > > > > > > > > > > > > > > > > > > > > > > > I also think that the SHARE_BUF_SIZE define needs a > > > > > > > comment > > > > > > > stating that it must be a > > > > > > > multiple of 8, otherwise unexpected things can happen. > > > > > > > > > > > > > > You also noticed that the current SHARE_BUF_SIZE define > > > > > > > is too > > > > > > > low, but I saw > > > > > > > no patch correcting this. Shouldn't that be fixed as > > > > > > > well? > > > > > > > > > > > > AFAICT the firmware expects this exact size on its end, so > > > > > > I > > > > > > don't > > > > > > believe it can be changed that easily. But maybe someone > > > > > > from MTK > > > > > > can > > > > > > prove me wrong. > > > > > > > > > > > > > > > > I looked further and noted that the structs that are larger > > > > > than > > > > > 'SHARE_BUF_SIZE' > > > > > (venc_ap_ipi_msg_enc_ext venc_ap_ipi_msg_set_param_ext) > > > > > are used by drivers that don't use this vpu api, so actually > > > > > SHARE_BUF_SIZE is > > > > > not too low and as Corurbot worte probably not changeable. > > > > > > > > > > > > > > > Thanks, > > > > > Dafna > > > > > > > > > > > Cheers, > > > > > > Alex. > > > > > > > > > > > > > >
WARNING: multiple messages have this Message-ID (diff)
From: Irui Wang <irui.wang@mediatek.com> To: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>, houlong wei <houlong.wei@mediatek.com>, Alexandre Courbot <acourbot@chromium.org>, "Hans Verkuil" <hverkuil@xs4all.nl> Cc: "Linux Media Mailing List" <linux-media@vger.kernel.org>, "moderated list:ARM/Mediatek SoC support" <linux-mediatek@lists.infradead.org>, LKML <linux-kernel@vger.kernel.org>, "kernel@collabora.com" <kernel@collabora.com>, "Dafna Hirschfeld" <dafna3@gmail.com>, "Tiffany Lin (林慧珊)" <tiffany.lin@mediatek.com>, "Andrew-CT Chen (陳智迪)" <Andrew-CT.Chen@mediatek.com>, "Minghsiu Tsai (蔡明修)" <Minghsiu.Tsai@mediatek.com>, "Mauro Carvalho Chehab" <mchehab@kernel.org>, "Matthias Brugger" <matthias.bgg@gmail.com> Subject: Re: [PATCH v4] media: mtk-vpu: Ensure alignment of 8 for DTCM buffer Date: Wed, 10 Nov 2021 11:11:30 +0800 [thread overview] Message-ID: <054260428d9d7718f630ecc1b2bdec34ecf1f799.camel@mediatek.com> (raw) In-Reply-To: <428f216d-cdff-e22d-b96e-f9dd9cc158e3@collabora.com> Hi, Dafna, Thanks for the patch. On Tue, 2021-11-09 at 10:46 +0200, Dafna Hirschfeld wrote: > > On 03.11.21 13:04, Dafna Hirschfeld wrote: > > > > > > On 03.11.21 10:19, Irui Wang wrote: > > > Hi, > > > > > > The "len" of share_buf copied should be always 8 alignment; > > > do you have other logs to prove the len is not 8 alignment when > > > errors > > > appear? > > > > Hi, I found out that "sizeof(mdp_ipi_comm) = 20" > > this is due to the macro #pragma pack(push, 4) in mtk_mdp_ipi.h > > > > see [1] > > > > [1] http://lkml.iu.edu/hypermail/linux/kernel/2109.2/04978.html > > > > Hi Irui Wang, > Any update regarding that patch? > Can you give more explanation for that errors that we see > when the buffer size is not a multiple of 8? > > Thanks, > Dafna share_buf is a mapped memory by ioremap, it should be better use memcpy_to/fromio instead of memcpy because of alignment. As for memcpy_toio, it may also have requirements for alignment, we can also get such information from: https://elixir.bootlin.com/linux/v5.15/source/drivers/mtd/spi-nor/controllers/aspeed-smc.c#L207 . So, it's not VPU HW bug or limitation, it's memcpy_toio requirements, maybe we can modify IPI message to do alignment, but it need modify both kernel and vpu firmware, which will break upstream backward compatible, we think it's unacceptale. If this patch can solve the issue, we think it's OK. Thanks > > > Thanks, > > Dafna > > > > > > > [58.350841] mtk-mdp 14001000.rdma: processing failed: -22 > > > > > > On Wed, 2021-11-03 at 16:03 +0800, houlong wei wrote: > > > > Add mtk-vpu driver expert irui.wang in the loop. > > > > > > > > On Mon, 2021-10-18 at 15:07 +0800, Dafna Hirschfeld wrote: > > > > > > > > > > On 18.10.21 03:16, Alexandre Courbot wrote: > > > > > > Hi Hans! > > > > > > > > > > > > On Mon, Oct 4, 2021 at 6:37 PM Hans Verkuil < > > > > > > hverkuil@xs4all.nl> > > > > > > wrote: > > > > > > > > > > > > > > On 20/09/2021 19:04, Dafna Hirschfeld wrote: > > > > > > > > From: Alexandre Courbot <acourbot@chromium.org> > > > > > > > > > > > > > > > > When running memcpy_toio: > > > > > > > > memcpy_toio(send_obj->share_buf, buf, len); > > > > > > > > it was found that errors appear if len is not a > > > > > > > > multiple of > > > > > > > > 8: > > > > > > > > > > > > > > > > [58.350841] mtk-mdp 14001000.rdma: processing failed: > > > > > > > > -22 > > > > > > > > > > > > > > Why do errors appear? Is that due to a HW bug? Some other > > > > > > > reason? > > > > > > > > > > > > MTK folks would be the best placed to answer this, but > > > > > > since the > > > > > > failure is reported by the firmware I'd suspect either a > > > > > > firmware > > > > > > or > > > > > > hardware limitation. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > This patch ensures the copy of a multiple of 8 size by > > > > > > > > calling > > > > > > > > round_up(len, 8) when copying > > > > > > > > > > > > > > > > Fixes: e6599adfad30 ("media: mtk-vpu: avoid unaligned > > > > > > > > access > > > > > > > > to > > > > > > > > DTCM buffer.") > > > > > > > > Signed-off-by: Alexandre Courbot <acourbot@chromium.org > > > > > > > > > > > > > > > > > Signed-off-by: Enric Balletbo i Serra < > > > > > > > > enric.balletbo@collabora.com> > > > > > > > > Signed-off-by: Dafna Hirschfeld < > > > > > > > > dafna.hirschfeld@collabora.com > > > > > > > > > > > > > > > > > > > > > > > > > Reviewed-by: Houlong Wei <houlong.wei@mediatek.com> > > > > > > > > --- > > > > > > > > changes since v3: > > > > > > > > 1. multile -> multiple > > > > > > > > 2. add inline doc > > > > > > > > > > > > > > > > changes since v2: > > > > > > > > 1. do the extra copy only if len is not multiple of 8 > > > > > > > > > > > > > > > > changes since v1: > > > > > > > > 1. change sign-off-by tags > > > > > > > > 2. change values to memset > > > > > > > > > > > > > > > > drivers/media/platform/mtk-vpu/mtk_vpu.c | 15 > > > > > > > > ++++++++++++++- > > > > > > > > 1 file changed, 14 insertions(+), 1 deletion(-) > > > > > > > > > > > > > > > > diff --git a/drivers/media/platform/mtk-vpu/mtk_vpu.c > > > > > > > > b/drivers/media/platform/mtk-vpu/mtk_vpu.c > > > > > > > > index ec290dde59cf..1df031716c8f 100644 > > > > > > > > --- a/drivers/media/platform/mtk-vpu/mtk_vpu.c > > > > > > > > +++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c > > > > > > > > @@ -349,7 +349,20 @@ int vpu_ipi_send(struct > > > > > > > > platform_device > > > > > > > > *pdev, > > > > > > > > } > > > > > > > > } while (vpu_cfg_readl(vpu, HOST_TO_VPU)); > > > > > > > > > > > > > > > > - memcpy_toio(send_obj->share_buf, buf, len); > > > > > > > > + /* > > > > > > > > + * when copying data to the vpu hardware, the > > > > > > > > memcpy_toio > > > > > > > > operation must copy > > > > > > > > + * a multiple of 8. Otherwise the processing > > > > > > > > fails > > > > > > > > > > > > > > Same here: it needs to explain why the processing fails. > > > > > > > > > > Is writing 'due to hardware or firmware limitation' enough? > > > > > If not, then we should wait for mediatek people's response to > > > > > explain > > > > > if they know more > > > > > > > > > > > > > > > > > > > > + */ > > > > > > > > + if (len % 8 != 0) { > > > > > > > > + unsigned char data[SHARE_BUF_SIZE]; > > > > > > > > > > > > > > Wouldn't it be more robust if you say: > > > > > > > > > > > > > > unsigned char data[sizeof(send_obj- > > > > > > > > share_buf)]; > > > > > > > > > > > > Definitely yes. > > > > > > > > > > I'll send v5 fixing this > > > > > > > > > > > > > > > > > > > > > > > > > I also think that the SHARE_BUF_SIZE define needs a > > > > > > > comment > > > > > > > stating that it must be a > > > > > > > multiple of 8, otherwise unexpected things can happen. > > > > > > > > > > > > > > You also noticed that the current SHARE_BUF_SIZE define > > > > > > > is too > > > > > > > low, but I saw > > > > > > > no patch correcting this. Shouldn't that be fixed as > > > > > > > well? > > > > > > > > > > > > AFAICT the firmware expects this exact size on its end, so > > > > > > I > > > > > > don't > > > > > > believe it can be changed that easily. But maybe someone > > > > > > from MTK > > > > > > can > > > > > > prove me wrong. > > > > > > > > > > > > > > > > I looked further and noted that the structs that are larger > > > > > than > > > > > 'SHARE_BUF_SIZE' > > > > > (venc_ap_ipi_msg_enc_ext venc_ap_ipi_msg_set_param_ext) > > > > > are used by drivers that don't use this vpu api, so actually > > > > > SHARE_BUF_SIZE is > > > > > not too low and as Corurbot worte probably not changeable. > > > > > > > > > > > > > > > Thanks, > > > > > Dafna > > > > > > > > > > > Cheers, > > > > > > Alex. > > > > > > > > > > > > > > _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek
next prev parent reply other threads:[~2021-11-10 3:11 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-09-20 17:04 [PATCH v4] media: mtk-vpu: Ensure alignment of 8 for DTCM buffer Dafna Hirschfeld 2021-09-20 17:04 ` Dafna Hirschfeld 2021-10-04 9:37 ` Hans Verkuil 2021-10-04 9:37 ` Hans Verkuil 2021-10-18 1:16 ` Alexandre Courbot 2021-10-18 1:16 ` Alexandre Courbot 2021-10-18 7:07 ` Dafna Hirschfeld 2021-10-18 7:07 ` Dafna Hirschfeld 2021-11-03 8:03 ` houlong wei 2021-11-03 8:03 ` houlong wei 2021-11-03 9:19 ` Irui Wang 2021-11-03 9:19 ` Irui Wang 2021-11-03 11:04 ` Dafna Hirschfeld 2021-11-03 11:04 ` Dafna Hirschfeld 2021-11-09 8:46 ` Dafna Hirschfeld 2021-11-09 8:46 ` Dafna Hirschfeld 2021-11-10 3:11 ` Irui Wang [this message] 2021-11-10 3:11 ` Irui Wang 2021-11-29 8:11 ` Dafna Hirschfeld 2021-11-29 8:11 ` Dafna Hirschfeld 2021-11-29 14:39 ` Dafna Hirschfeld 2021-11-29 14:39 ` Dafna Hirschfeld 2021-12-06 7:23 ` Alexandre Courbot 2021-12-06 7:23 ` Alexandre Courbot 2022-02-15 9:41 ` AngeloGioacchino Del Regno 2022-02-15 9:41 ` AngeloGioacchino Del Regno
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