drivers/media/platform/mediatek/vpu/mtk_vpu.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-)
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
This is because in ARM64, memcpy_toio does byte-size access
when the length is not a multiple of 8 while access to the
vpu iomem must be 4 aligned.
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: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Signed-off-by: Pin-yen Lin <treapking@chromium.org>
Reviewed-by: Houlong Wei <houlong.wei@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
This is a re-send of v5 because it was marked obsolete, but this patch
is required for MT8173 platforms.
Changes in v6:
- Collect review tag
drivers/media/platform/mediatek/vpu/mtk_vpu.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/media/platform/mediatek/vpu/mtk_vpu.c b/drivers/media/platform/mediatek/vpu/mtk_vpu.c
index 5e2bc286f168..19ff4afea456 100644
--- a/drivers/media/platform/mediatek/vpu/mtk_vpu.c
+++ b/drivers/media/platform/mediatek/vpu/mtk_vpu.c
@@ -349,7 +349,22 @@ int vpu_ipi_send(struct platform_device *pdev,
}
} while (vpu_cfg_readl(vpu, HOST_TO_VPU));
- memcpy_toio(send_obj->share_buf, buf, len);
+ /*
+ * On Arm64, the memcpy_toio does byte-size access as long as address or length are
+ * not 8 aligned. Access to the vpu iomem must be 4 aligned. Byte-size access is
+ * not allowed and cause processing to fail. Therefore make sure the length
+ * sent to memcpy_toio is a multiply of 8.
+ */
+ if (len % 8 != 0) {
+ unsigned char data[sizeof(send_obj->share_buf)];
+
+ memset(data + len, 0, sizeof(data) - len);
+ memcpy(data, buf, len);
+ memcpy_toio(send_obj->share_buf, data, round_up(len, 8));
+ } else {
+ memcpy_toio(send_obj->share_buf, buf, len);
+ }
+
writel(len, &send_obj->len);
writel(id, &send_obj->id);
--
2.41.0.rc0.172.g3f132b7071-goog
Il 26/05/23 08:31, Pin-yen Lin ha scritto: > 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 > > This is because in ARM64, memcpy_toio does byte-size access > when the length is not a multiple of 8 while access to the > vpu iomem must be 4 aligned. > > 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: Dafna Hirschfeld <dafna.hirschfeld@collabora.com> > Signed-off-by: Pin-yen Lin <treapking@chromium.org> > Reviewed-by: Houlong Wei <houlong.wei@mediatek.com> > Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> > > --- > This is a re-send of v5 because it was marked obsolete, but this patch > is required for MT8173 platforms. > Hello, I have solved this issue in a different way and the commit was already picked. Please check: ab14c99c035d ("media: platform: mtk-mdp: Fix mdp_ipi_comm structure alignment") Regards, Angelo
Hi Angelo, Thanks for letting me know. Then, this patch is not needed. Regards, Pin-yen On Mon, May 29, 2023 at 4:31 PM AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> wrote: > > Il 26/05/23 08:31, Pin-yen Lin ha scritto: > > 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 > > > > This is because in ARM64, memcpy_toio does byte-size access > > when the length is not a multiple of 8 while access to the > > vpu iomem must be 4 aligned. > > > > 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: Dafna Hirschfeld <dafna.hirschfeld@collabora.com> > > Signed-off-by: Pin-yen Lin <treapking@chromium.org> > > Reviewed-by: Houlong Wei <houlong.wei@mediatek.com> > > Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> > > > > --- > > This is a re-send of v5 because it was marked obsolete, but this patch > > is required for MT8173 platforms. > > > > Hello, > I have solved this issue in a different way and the commit was already picked. > > Please check: > ab14c99c035d ("media: platform: mtk-mdp: Fix mdp_ipi_comm structure alignment") > > Regards, > Angelo >
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