* [PATCH] media: mtk-vpu: Ensure alignment of 8 for DTCM buffer
@ 2021-07-14 13:48 Dafna Hirschfeld
2021-07-14 14:03 ` Enric Balletbo Serra
2021-07-20 12:33 ` Hans Verkuil
0 siblings, 2 replies; 3+ messages in thread
From: Dafna Hirschfeld @ 2021-07-14 13:48 UTC (permalink / raw)
To: linux-media, linux-mediatek, linux-kernel
Cc: dafna.hirschfeld, hverkuil, kernel, dafna3, mchehab, tfiga,
enric.balletbo, minghsiu.tsai, houlong.wei, andrew-ct.chen,
tiffany.lin, matthias.bgg, acourbot, hsinyi, eizan
From: Enric Balletbo i Serra <enric.balletbo@collabora.com>
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
This patch ensure copy of a multile of 8 size by calling
round_up(len, 8) when copying
Fixes: e6599adfad30 ("media: mtk-vpu: avoid unaligned access to DTCM buffer.")
Reported-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>
---
drivers/media/platform/mtk-vpu/mtk_vpu.c | 5 ++++-
1 file changed, 4 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..b464d8192119 100644
--- a/drivers/media/platform/mtk-vpu/mtk_vpu.c
+++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c
@@ -316,6 +316,7 @@ int vpu_ipi_send(struct platform_device *pdev,
{
struct mtk_vpu *vpu = platform_get_drvdata(pdev);
struct share_obj __iomem *send_obj = vpu->send_buf;
+ unsigned char data[SHARE_BUF_SIZE];
unsigned long timeout;
int ret = 0;
@@ -349,7 +350,9 @@ int vpu_ipi_send(struct platform_device *pdev,
}
} while (vpu_cfg_readl(vpu, HOST_TO_VPU));
- memcpy_toio(send_obj->share_buf, buf, len);
+ memset(data, 0, sizeof(data));
+ memcpy(data, buf, len);
+ memcpy_toio(send_obj->share_buf, data, round_up(len, 8));
writel(len, &send_obj->len);
writel(id, &send_obj->id);
--
2.17.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] media: mtk-vpu: Ensure alignment of 8 for DTCM buffer
2021-07-14 13:48 [PATCH] media: mtk-vpu: Ensure alignment of 8 for DTCM buffer Dafna Hirschfeld
@ 2021-07-14 14:03 ` Enric Balletbo Serra
2021-07-20 12:33 ` Hans Verkuil
1 sibling, 0 replies; 3+ messages in thread
From: Enric Balletbo Serra @ 2021-07-14 14:03 UTC (permalink / raw)
To: Dafna Hirschfeld
Cc: Linux Media Mailing List,
moderated list:ARM/Mediatek SoC support, linux-kernel,
Hans Verkuil, Collabora Kernel ML, dafna3, Mauro Carvalho Chehab,
Tomasz Figa, Enric Balletbo i Serra, Minghsiu Tsai, Houlong Wei,
Andrew-CT Chen, Tiffany Lin, Matthias Brugger, Alexandre Courbot,
Hsin-Yi Wang, Eizan Miyamoto
Hi Dafna,
Thank you for working on this and sending the patch to upstream for
further discussion.
Missatge de Dafna Hirschfeld <dafna.hirschfeld@collabora.com> del dia
dc., 14 de jul. 2021 a les 15:49:
>
> From: Enric Balletbo i Serra <enric.balletbo@collabora.com>
>
Sorry to confuse you, but I'm not the author of this patch, my from is
only here because I shared with you that patch that I really picked
from a discussion that took place here:
https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2251840
It'd be really nice to continue the discussion here and set a proper
fix and understand better the root cause and the fix. The patch really
fixes an issue in mainline for mtk-vcodec driver on the mt8173
devices, I can confirm that without it doesn't work properly.
Waiting for your thoughts,
Enric
> 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
>
> This patch ensure copy of a multile of 8 size by calling
> round_up(len, 8) when copying
>
> Fixes: e6599adfad30 ("media: mtk-vpu: avoid unaligned access to DTCM buffer.")
> Reported-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>
> ---
> drivers/media/platform/mtk-vpu/mtk_vpu.c | 5 ++++-
> 1 file changed, 4 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..b464d8192119 100644
> --- a/drivers/media/platform/mtk-vpu/mtk_vpu.c
> +++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c
> @@ -316,6 +316,7 @@ int vpu_ipi_send(struct platform_device *pdev,
> {
> struct mtk_vpu *vpu = platform_get_drvdata(pdev);
> struct share_obj __iomem *send_obj = vpu->send_buf;
> + unsigned char data[SHARE_BUF_SIZE];
> unsigned long timeout;
> int ret = 0;
>
> @@ -349,7 +350,9 @@ int vpu_ipi_send(struct platform_device *pdev,
> }
> } while (vpu_cfg_readl(vpu, HOST_TO_VPU));
>
> - memcpy_toio(send_obj->share_buf, buf, len);
> + memset(data, 0, sizeof(data));
> + memcpy(data, buf, len);
> + memcpy_toio(send_obj->share_buf, data, round_up(len, 8));
> writel(len, &send_obj->len);
> writel(id, &send_obj->id);
>
> --
> 2.17.1
>
>
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] media: mtk-vpu: Ensure alignment of 8 for DTCM buffer
2021-07-14 13:48 [PATCH] media: mtk-vpu: Ensure alignment of 8 for DTCM buffer Dafna Hirschfeld
2021-07-14 14:03 ` Enric Balletbo Serra
@ 2021-07-20 12:33 ` Hans Verkuil
1 sibling, 0 replies; 3+ messages in thread
From: Hans Verkuil @ 2021-07-20 12:33 UTC (permalink / raw)
To: Dafna Hirschfeld, linux-media, linux-mediatek, linux-kernel
Cc: kernel, dafna3, mchehab, tfiga, enric.balletbo, minghsiu.tsai,
houlong.wei, andrew-ct.chen, tiffany.lin, matthias.bgg, acourbot,
hsinyi, eizan
On 14/07/2021 15:48, Dafna Hirschfeld wrote:
> From: Enric Balletbo i Serra <enric.balletbo@collabora.com>
>
> 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
>
> This patch ensure copy of a multile of 8 size by calling
> round_up(len, 8) when copying
>
> Fixes: e6599adfad30 ("media: mtk-vpu: avoid unaligned access to DTCM buffer.")
> Reported-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>
> ---
> drivers/media/platform/mtk-vpu/mtk_vpu.c | 5 ++++-
> 1 file changed, 4 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..b464d8192119 100644
> --- a/drivers/media/platform/mtk-vpu/mtk_vpu.c
> +++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c
> @@ -316,6 +316,7 @@ int vpu_ipi_send(struct platform_device *pdev,
> {
> struct mtk_vpu *vpu = platform_get_drvdata(pdev);
> struct share_obj __iomem *send_obj = vpu->send_buf;
> + unsigned char data[SHARE_BUF_SIZE];
> unsigned long timeout;
> int ret = 0;
>
> @@ -349,7 +350,9 @@ int vpu_ipi_send(struct platform_device *pdev,
> }
> } while (vpu_cfg_readl(vpu, HOST_TO_VPU));
>
> - memcpy_toio(send_obj->share_buf, buf, len);
> + memset(data, 0, sizeof(data));
Hmm, how about:
memset(data + len, 0, sizeof(data) - len);
> + memcpy(data, buf, len);
> + memcpy_toio(send_obj->share_buf, data, round_up(len, 8));
> writel(len, &send_obj->len);
> writel(id, &send_obj->id);
>
>
Also note Enric's reply.
Regards,
Hans
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2021-07-14 13:48 [PATCH] media: mtk-vpu: Ensure alignment of 8 for DTCM buffer Dafna Hirschfeld
2021-07-14 14:03 ` Enric Balletbo Serra
2021-07-20 12:33 ` Hans Verkuil
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