| Message ID | 20240720071606.27930-3-yunfei.dong@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | media: mediatek: add driver to support secure video decoder | expand |
On 20/07/2024 09:15, Yunfei Dong wrote: > From: Jeffrey Kardatzke <jkardatzke@google.com> > > Validates the restricted memory flags when setting up a queue and > ensures the queue has the proper capability. > > Signed-off-by: Jeffrey Kardatzke <jkardatzke@google.com> > Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com> > [Yunfei: Change reviewer's comments] > --- > .../media/common/videobuf2/videobuf2-core.c | 29 +++++++++++++++++++ > .../media/common/videobuf2/videobuf2-v4l2.c | 4 ++- > 2 files changed, 32 insertions(+), 1 deletion(-) > > diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c > index 0217392fcc0d..44080121f37e 100644 > --- a/drivers/media/common/videobuf2/videobuf2-core.c > +++ b/drivers/media/common/videobuf2/videobuf2-core.c > @@ -830,6 +830,23 @@ static bool verify_coherency_flags(struct vb2_queue *q, bool non_coherent_mem) > return true; > } > > +static bool verify_restricted_mem_flags(struct vb2_queue *q, bool restricted_mem) > +{ > + if (restricted_mem != q->restricted_mem) { > + dprintk(q, 1, "restricted memory model mismatch\n"); > + return false; > + } > + > + return true; > +} > + > +static inline int restricted_mem_mismatch(bool restricted_mem, struct vb2_queue *q, > + enum vb2_memory memory) > +{ > + return restricted_mem && (!q->allow_restricted_mem || memory != VB2_MEMORY_DMABUF) ? > + -1 : 0; Returning -1 is odd, just return a bool here. > +} > + > static int vb2_core_allocated_buffers_storage(struct vb2_queue *q) > { > if (!q->bufs) > @@ -863,6 +880,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, > unsigned int q_num_bufs = vb2_get_num_buffers(q); > unsigned plane_sizes[VB2_MAX_PLANES] = { }; > bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT; > + bool restricted_mem = flags & V4L2_MEMORY_FLAG_RESTRICTED; > unsigned int i, first_index; > int ret = 0; > > @@ -906,6 +924,9 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, > return 0; > } > > + if (restricted_mem_mismatch(restricted_mem, q, memory)) > + return -EINVAL; > + > /* > * Make sure the requested values and current defaults are sane. > */ > @@ -923,6 +944,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, > if (ret) > return ret; > set_queue_coherency(q, non_coherent_mem); > + q->restricted_mem = restricted_mem; > > /* > * Ask the driver how many buffers and planes per buffer it requires. > @@ -1031,6 +1053,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, > unsigned plane_sizes[VB2_MAX_PLANES] = { }; > bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT; > unsigned int q_num_bufs = vb2_get_num_buffers(q); > + bool restricted_mem = flags & V4L2_MEMORY_FLAG_RESTRICTED; > bool no_previous_buffers = !q_num_bufs; > int ret = 0; > > @@ -1039,6 +1062,9 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, > return -ENOBUFS; > } > > + if (restricted_mem_mismatch(restricted_mem, q, memory)) > + return -EINVAL; > + > if (no_previous_buffers) { > if (q->waiting_in_dqbuf && *count) { > dprintk(q, 1, "another dup()ped fd is waiting for a buffer\n"); > @@ -1057,6 +1083,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, > return ret; > q->waiting_for_buffers = !q->is_output; > set_queue_coherency(q, non_coherent_mem); > + q->restricted_mem = restricted_mem; > } else { > if (q->memory != memory) { > dprintk(q, 1, "memory model mismatch\n"); > @@ -1064,6 +1091,8 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, > } > if (!verify_coherency_flags(q, non_coherent_mem)) > return -EINVAL; > + if (!verify_restricted_mem_flags(q, restricted_mem)) > + return -EINVAL; > } > > num_buffers = min(*count, q->max_num_buffers - q_num_bufs); > diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c > index 293f3d5f1c4e..9ee24e537e0c 100644 > --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c > +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c > @@ -682,7 +682,7 @@ static void vb2_set_flags_and_caps(struct vb2_queue *q, u32 memory, > *flags = 0; > } else { > /* Clear all unknown flags. */ > - *flags &= V4L2_MEMORY_FLAG_NON_COHERENT; > + *flags &= V4L2_MEMORY_FLAG_NON_COHERENT | V4L2_MEMORY_FLAG_RESTRICTED; > } > > *caps |= V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS; > @@ -698,6 +698,8 @@ static void vb2_set_flags_and_caps(struct vb2_queue *q, u32 memory, > *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS; > if (q->supports_requests) > *caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS; > + if (q->allow_restricted_mem && q->io_modes & VB2_DMABUF) I think this io_modes test can be dropped. But it might be useful to add a WARN_ON in vb2_core_queue_init where this is checked. The WARN_ONs in that function really protect against driver bugs, making sure the driver doesn't pass incompatible combinations. Regards, Hans > + *caps |= V4L2_BUF_CAP_SUPPORTS_RESTRICTED_MEM; > if (max_num_bufs) { > *max_num_bufs = q->max_num_buffers; > *caps |= V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS;
On 20/07/2024 09:15, Yunfei Dong wrote: > From: Jeffrey Kardatzke <jkardatzke@google.com> > > Validates the restricted memory flags when setting up a queue and > ensures the queue has the proper capability. > > Signed-off-by: Jeffrey Kardatzke <jkardatzke@google.com> > Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com> > [Yunfei: Change reviewer's comments] > --- > .../media/common/videobuf2/videobuf2-core.c | 29 +++++++++++++++++++ > .../media/common/videobuf2/videobuf2-v4l2.c | 4 ++- > 2 files changed, 32 insertions(+), 1 deletion(-) > > diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c > index 0217392fcc0d..44080121f37e 100644 > --- a/drivers/media/common/videobuf2/videobuf2-core.c > +++ b/drivers/media/common/videobuf2/videobuf2-core.c > @@ -830,6 +830,23 @@ static bool verify_coherency_flags(struct vb2_queue *q, bool non_coherent_mem) > return true; > } > > +static bool verify_restricted_mem_flags(struct vb2_queue *q, bool restricted_mem) > +{ > + if (restricted_mem != q->restricted_mem) { > + dprintk(q, 1, "restricted memory model mismatch\n"); > + return false; > + } > + > + return true; > +} > + > +static inline int restricted_mem_mismatch(bool restricted_mem, struct vb2_queue *q, > + enum vb2_memory memory) > +{ > + return restricted_mem && (!q->allow_restricted_mem || memory != VB2_MEMORY_DMABUF) ? > + -1 : 0; > +} > + > static int vb2_core_allocated_buffers_storage(struct vb2_queue *q) > { > if (!q->bufs) > @@ -863,6 +880,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, > unsigned int q_num_bufs = vb2_get_num_buffers(q); > unsigned plane_sizes[VB2_MAX_PLANES] = { }; > bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT; > + bool restricted_mem = flags & V4L2_MEMORY_FLAG_RESTRICTED; > unsigned int i, first_index; > int ret = 0; > > @@ -906,6 +924,9 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, > return 0; > } > > + if (restricted_mem_mismatch(restricted_mem, q, memory)) > + return -EINVAL; > + > /* > * Make sure the requested values and current defaults are sane. > */ > @@ -923,6 +944,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, > if (ret) > return ret; > set_queue_coherency(q, non_coherent_mem); > + q->restricted_mem = restricted_mem; > > /* > * Ask the driver how many buffers and planes per buffer it requires. > @@ -1031,6 +1053,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, > unsigned plane_sizes[VB2_MAX_PLANES] = { }; > bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT; > unsigned int q_num_bufs = vb2_get_num_buffers(q); > + bool restricted_mem = flags & V4L2_MEMORY_FLAG_RESTRICTED; > bool no_previous_buffers = !q_num_bufs; > int ret = 0; > > @@ -1039,6 +1062,9 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, > return -ENOBUFS; > } > > + if (restricted_mem_mismatch(restricted_mem, q, memory)) > + return -EINVAL; > + > if (no_previous_buffers) { > if (q->waiting_in_dqbuf && *count) { > dprintk(q, 1, "another dup()ped fd is waiting for a buffer\n"); > @@ -1057,6 +1083,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, > return ret; > q->waiting_for_buffers = !q->is_output; > set_queue_coherency(q, non_coherent_mem); > + q->restricted_mem = restricted_mem; > } else { > if (q->memory != memory) { > dprintk(q, 1, "memory model mismatch\n"); > @@ -1064,6 +1091,8 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, > } > if (!verify_coherency_flags(q, non_coherent_mem)) > return -EINVAL; > + if (!verify_restricted_mem_flags(q, restricted_mem)) > + return -EINVAL; > } > > num_buffers = min(*count, q->max_num_buffers - q_num_bufs); > diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c > index 293f3d5f1c4e..9ee24e537e0c 100644 > --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c > +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c > @@ -682,7 +682,7 @@ static void vb2_set_flags_and_caps(struct vb2_queue *q, u32 memory, > *flags = 0; Hmm, unless I am mistaken, this clears all flags. So if memory is DMABUF, then the V4L2_MEMORY_FLAG_RESTRICTED is just overwritten with 0. And that's what will be passed to vb2_core_reqbufs. So how can this work? I'm not sure how you can have tested this. In any case, this function should change and do this instead: /* Clear all unknown flags. */ *flags &= V4L2_MEMORY_FLAG_NON_COHERENT | V4L2_MEMORY_FLAG_RESTRICTED; if (!q->allow_cache_hints || memory != V4L2_MEMORY_MMAP) *flags &= ~V4L2_MEMORY_FLAG_NON_COHERENT; I considered whether V4L2_MEMORY_FLAG_RESTRICTED should be cleared if memory wasn't DMABUF, but I don't think that is right: you want to see an error returned if you try such a combination. > } else { > /* Clear all unknown flags. */ > - *flags &= V4L2_MEMORY_FLAG_NON_COHERENT; > + *flags &= V4L2_MEMORY_FLAG_NON_COHERENT | V4L2_MEMORY_FLAG_RESTRICTED; > } > > *caps |= V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS; > @@ -698,6 +698,8 @@ static void vb2_set_flags_and_caps(struct vb2_queue *q, u32 memory, > *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS; > if (q->supports_requests) > *caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS; > + if (q->allow_restricted_mem && q->io_modes & VB2_DMABUF) > + *caps |= V4L2_BUF_CAP_SUPPORTS_RESTRICTED_MEM; > if (max_num_bufs) { > *max_num_bufs = q->max_num_buffers; > *caps |= V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS; What appears to be missing in this patch is what happens if you pass unrestricted memory to a queue that is configured for restricted memory: there does not appear to be a check for that. Or is that allowed? If so, that should be documented. And what happens if you pass a dmabuf for restricted memory to a queue that expects unrestricted memory? You want to get a nice error code for that (EACCES/EPERM, I never quite know which is the right one for that). That would apply to VIDIOC_QBUF and VIDIOC_PREPARE_BUF. This assumes you can easily query a dmabuf fd to see whether it is in restricted memory or not. I'm not sure if that is the case today. I also think that it would be useful to add a V4L2_BUF_FLAG_RESTRICTED_MEM flag that vb2 will return to userspace if the queue is configured for restricted memory. That will indicate to the application that the buffer indeed represents a buffer in restricted memory. Regards, Hans
diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index 0217392fcc0d..44080121f37e 100644 --- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -830,6 +830,23 @@ static bool verify_coherency_flags(struct vb2_queue *q, bool non_coherent_mem) return true; } +static bool verify_restricted_mem_flags(struct vb2_queue *q, bool restricted_mem) +{ + if (restricted_mem != q->restricted_mem) { + dprintk(q, 1, "restricted memory model mismatch\n"); + return false; + } + + return true; +} + +static inline int restricted_mem_mismatch(bool restricted_mem, struct vb2_queue *q, + enum vb2_memory memory) +{ + return restricted_mem && (!q->allow_restricted_mem || memory != VB2_MEMORY_DMABUF) ? + -1 : 0; +} + static int vb2_core_allocated_buffers_storage(struct vb2_queue *q) { if (!q->bufs) @@ -863,6 +880,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, unsigned int q_num_bufs = vb2_get_num_buffers(q); unsigned plane_sizes[VB2_MAX_PLANES] = { }; bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT; + bool restricted_mem = flags & V4L2_MEMORY_FLAG_RESTRICTED; unsigned int i, first_index; int ret = 0; @@ -906,6 +924,9 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, return 0; } + if (restricted_mem_mismatch(restricted_mem, q, memory)) + return -EINVAL; + /* * Make sure the requested values and current defaults are sane. */ @@ -923,6 +944,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, if (ret) return ret; set_queue_coherency(q, non_coherent_mem); + q->restricted_mem = restricted_mem; /* * Ask the driver how many buffers and planes per buffer it requires. @@ -1031,6 +1053,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, unsigned plane_sizes[VB2_MAX_PLANES] = { }; bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT; unsigned int q_num_bufs = vb2_get_num_buffers(q); + bool restricted_mem = flags & V4L2_MEMORY_FLAG_RESTRICTED; bool no_previous_buffers = !q_num_bufs; int ret = 0; @@ -1039,6 +1062,9 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, return -ENOBUFS; } + if (restricted_mem_mismatch(restricted_mem, q, memory)) + return -EINVAL; + if (no_previous_buffers) { if (q->waiting_in_dqbuf && *count) { dprintk(q, 1, "another dup()ped fd is waiting for a buffer\n"); @@ -1057,6 +1083,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, return ret; q->waiting_for_buffers = !q->is_output; set_queue_coherency(q, non_coherent_mem); + q->restricted_mem = restricted_mem; } else { if (q->memory != memory) { dprintk(q, 1, "memory model mismatch\n"); @@ -1064,6 +1091,8 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, } if (!verify_coherency_flags(q, non_coherent_mem)) return -EINVAL; + if (!verify_restricted_mem_flags(q, restricted_mem)) + return -EINVAL; } num_buffers = min(*count, q->max_num_buffers - q_num_bufs); diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c index 293f3d5f1c4e..9ee24e537e0c 100644 --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c @@ -682,7 +682,7 @@ static void vb2_set_flags_and_caps(struct vb2_queue *q, u32 memory, *flags = 0; } else { /* Clear all unknown flags. */ - *flags &= V4L2_MEMORY_FLAG_NON_COHERENT; + *flags &= V4L2_MEMORY_FLAG_NON_COHERENT | V4L2_MEMORY_FLAG_RESTRICTED; } *caps |= V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS; @@ -698,6 +698,8 @@ static void vb2_set_flags_and_caps(struct vb2_queue *q, u32 memory, *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS; if (q->supports_requests) *caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS; + if (q->allow_restricted_mem && q->io_modes & VB2_DMABUF) + *caps |= V4L2_BUF_CAP_SUPPORTS_RESTRICTED_MEM; if (max_num_bufs) { *max_num_bufs = q->max_num_buffers; *caps |= V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS;