On 30.07.21 04:52, Yong Wu wrote:
MediaTek IOMMU-SMI diagram is like below. all the consumer connect with smi-larb, then connect with smi-common.
M4U | smi-common |
| | ... | | larb1 larb2 | | vdec venc
When the consumer works, it should enable the smi-larb's power which also need enable the smi-common's power firstly.
Thus, First of all, use the device link connect the consumer and the smi-larbs. then add device link between the smi-larb and smi-common.
This patch adds device_link between the consumer and the larbs.
When device_link_add, I add the flag DL_FLAG_STATELESS to avoid calling pm_runtime_xx to keep the original status of clocks. It can avoid two issues:
- Display HW show fastlogo abnormally reported in [1]. At the beggining,
all the clocks are enabled before entering kernel, but the clocks for display HW(always in larb0) will be gated after clk_enable and clk_disable called from device_link_add(->pm_runtime_resume) and rpm_idle. The clock operation happened before display driver probe. At that time, the display HW will be abnormal.
- A deadlock issue reported in [2]. Use DL_FLAG_STATELESS to skip
pm_runtime_xx to avoid the deadlock.
Corresponding, DL_FLAG_AUTOREMOVE_CONSUMER can't be added, then device_link_removed should be added explicitly.
[1] https://lore.kernel.org/linux-mediatek/1564213888.22908.4.camel@mhfsdcap03/ [2] https://lore.kernel.org/patchwork/patch/1086569/
Suggested-by: Tomasz Figa tfiga@chromium.org Signed-off-by: Yong Wu yong.wu@mediatek.com Tested-by: Dafna Hirschfeld dafna.hirschfeld@collabora.com # on mt8173
Hi, unfortunately, I have to take back the Tested-by tag. I am now testing the mtk-vcodec with latest kernel + patches sent from the mailing list: https://gitlab.collabora.com/eballetbo/linux/-/commits/topic/chromeos/chrome... which includes this patchset.
On chromeos I open a video conference with googl-meet which cause the mtk-vcodec vp8 encoder to run. If I kill it with `killall -9 chrome` I get some page fault messages from the iommu:
[ 837.255952] mtk-iommu 10205000.iommu: fault type=0x5 iova=0xfcff0001 pa=0x0 larb=0 port=0 layer=1 read [ 837.265696] mtk-iommu 10205000.iommu: fault type=0x5 iova=0xfcff0001 pa=0x0 larb=0 port=0 layer=1 read [ 837.282367] mtk-iommu 10205000.iommu: fault type=0x5 iova=0xfcff0001 pa=0x0 larb=0 port=0 layer=1 read [ 837.299028] mtk-iommu 10205000.iommu: fault type=0x5 iova=0xfcff0001 pa=0x0 larb=0 port=0 layer=1 read [ 837.315683] mtk-iommu 10205000.iommu: fault type=0x5 iova=0xfcff0001 pa=0x0 larb=0 port=0 layer=1 read [ 837.332345] mtk-iommu 10205000.iommu: fault type=0x5 iova=0xfcff0001 pa=0x0 larb=0 port=0 layer=1 read [ 837.349004] mtk-iommu 10205000.iommu: fault type=0x5 iova=0xfcff0001 pa=0x0 larb=0 port=0 layer=1 read [ 837.365665] mtk-iommu 10205000.iommu: fault type=0x5 iova=0xfcff0001 pa=0x0 larb=0 port=0 layer=1 read [ 837.382329] mtk-iommu 10205000.iommu: fault type=0x5 iova=0xfcff0001 pa=0x0 larb=0 port=0 layer=1 read [ 837.400002] mtk-iommu 10205000.iommu: fault type=0x5 iova=0xfcff0001 pa=0x0 larb=0 port=0 layer=1 read
In addition, running the encoder tests from the shell:
sudo --user=#1000 /usr/local/libexec/chrome-binary-tests/video_encode_accelerator_tests --gtest_filter=VideoEncoderTest.FlushAtEndOfStream_Multiple* --codec=vp8 /usr/local/share/tast/data/chromiumos/tast/local/bundles/cros/video/data/tulip2-320x180.yuv --disable_validator
At some point it fails with the error
[ 5472.161821] [MTK_V4L2][ERROR] mtk_vcodec_wait_for_done_ctx:32: [290] ctx->type=1, cmd=1, wait_event_interruptible_timeout time=1000ms out 0 0! [ 5472.174678] [MTK_VCODEC][ERROR][290]: vp8_enc_encode_frame() irq_status=0 failed [ 5472.182687] [MTK_V4L2][ERROR] mtk_venc_worker:1239: venc_if_encode failed=-5
If you have any idea of what might be the problem or how to debug?
Thanks, Dafna
drivers/iommu/mtk_iommu.c | 22 ++++++++++++++++++++++ drivers/iommu/mtk_iommu_v1.c | 20 +++++++++++++++++++- 2 files changed, 41 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index a02dde094788..ee742900cf4b 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -571,22 +571,44 @@ static struct iommu_device *mtk_iommu_probe_device(struct device *dev) { struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); struct mtk_iommu_data *data;
struct device_link *link;
struct device *larbdev;
unsigned int larbid;
if (!fwspec || fwspec->ops != &mtk_iommu_ops) return ERR_PTR(-ENODEV); /* Not a iommu client device */
data = dev_iommu_priv_get(dev);
/*
* Link the consumer device with the smi-larb device(supplier)* The device in each a larb is a independent HW. thus only link* one larb here.*/larbid = MTK_M4U_TO_LARB(fwspec->ids[0]);
larbdev = data->larb_imu[larbid].dev;
link = device_link_add(dev, larbdev,
DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS);if (!link)
dev_err(dev, "Unable to link %s\n", dev_name(larbdev));return &data->iommu; }
static void mtk_iommu_release_device(struct device *dev) { struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct mtk_iommu_data *data;
struct device *larbdev;
unsigned int larbid;
if (!fwspec || fwspec->ops != &mtk_iommu_ops) return;
data = dev_iommu_priv_get(dev);
larbid = MTK_M4U_TO_LARB(fwspec->ids[0]);
larbdev = data->larb_imu[larbid].dev;
device_link_remove(dev, larbdev);
iommu_fwspec_free(dev); }
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c index c259433f1130..806d4200665b 100644 --- a/drivers/iommu/mtk_iommu_v1.c +++ b/drivers/iommu/mtk_iommu_v1.c @@ -424,7 +424,9 @@ static struct iommu_device *mtk_iommu_probe_device(struct device *dev) struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); struct of_phandle_args iommu_spec; struct mtk_iommu_data *data;
- int err, idx = 0;
int err, idx = 0, larbid;
struct device_link *link;
struct device *larbdev;
/*
- In the deferred case, free the existed fwspec if the dev already has,
@@ -454,6 +456,14 @@ static struct iommu_device *mtk_iommu_probe_device(struct device *dev)
data = dev_iommu_priv_get(dev);
- /* Link the consumer device with the smi-larb device(supplier) */
- larbid = mt2701_m4u_to_larb(fwspec->ids[0]);
- larbdev = data->larb_imu[larbid].dev;
- link = device_link_add(dev, larbdev,
DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS);- if (!link)
dev_err(dev, "Unable to link %s\n", dev_name(larbdev));- return &data->iommu; }
@@ -474,10 +484,18 @@ static void mtk_iommu_probe_finalize(struct device *dev) static void mtk_iommu_release_device(struct device *dev) { struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct mtk_iommu_data *data;
struct device *larbdev;
unsigned int larbid;
if (!fwspec || fwspec->ops != &mtk_iommu_ops) return;
data = dev_iommu_priv_get(dev);
larbid = mt2701_m4u_to_larb(fwspec->ids[0]);
larbdev = data->larb_imu[larbid].dev;
device_link_remove(dev, larbdev);
iommu_fwspec_free(dev); }