[PATCH v2,02/21] v4l2: handle secure memory flags in queue setup
From: Yunfei Dong
Date: Mon Nov 06 2023 - 07:04:57 EST
From: Jeffrey Kardatzke <jkardatzke@xxxxxxxxxx>
Validates the secure memory flags when setting up a queue and ensures
the queue has the proper capability.
Signed-off-by: Jeffrey Kardatzke <jkardatzke@xxxxxxxxxx>
Signed-off-by: Yunfei Dong <yunfei.dong@xxxxxxxxxxxx>
---
.../media/common/videobuf2/videobuf2-core.c | 25 ++++++++++++++
.../media/common/videobuf2/videobuf2-v4l2.c | 33 ++++++++++++-------
2 files changed, 47 insertions(+), 11 deletions(-)
diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 27aee92f3eea..7ee68f5533ba 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -744,12 +744,22 @@ static bool verify_coherency_flags(struct vb2_queue *q, bool non_coherent_mem)
return true;
}
+static bool verify_secure_mem_flags(struct vb2_queue *q, bool secure_mem)
+{
+ if (secure_mem != q->secure_mem) {
+ dprintk(q, 1, "secure memory model mismatch\n");
+ return false;
+ }
+ return true;
+}
+
int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
unsigned int flags, unsigned int *count)
{
unsigned int num_buffers, allocated_buffers, num_planes = 0;
unsigned plane_sizes[VB2_MAX_PLANES] = { };
bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT;
+ bool secure_mem = flags & V4L2_MEMORY_FLAG_SECURE;
unsigned int i;
int ret;
@@ -766,6 +776,8 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
if (*count == 0 || q->num_buffers != 0 ||
(q->memory != VB2_MEMORY_UNKNOWN && q->memory != memory) ||
!verify_coherency_flags(q, non_coherent_mem)) {
+ bool no_previous_buffers = !q->num_buffers;
+
/*
* We already have buffers allocated, so first check if they
* are not in use and can be freed.
@@ -784,6 +796,14 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
__vb2_queue_free(q, q->num_buffers);
mutex_unlock(&q->mmap_lock);
+ /*
+ * Do not allow switching secure buffer mode.
+ */
+ if (!no_previous_buffers &&
+ !verify_secure_mem_flags(q, secure_mem)) {
+ return -EINVAL;
+ }
+
/*
* In case of REQBUFS(0) return immediately without calling
* driver's queue_setup() callback and allocating resources.
@@ -807,6 +827,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
q->memory = memory;
mutex_unlock(&q->mmap_lock);
set_queue_coherency(q, non_coherent_mem);
+ q->secure_mem = secure_mem;
/*
* Ask the driver how many buffers and planes per buffer it requires.
@@ -910,6 +931,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
unsigned int num_planes = 0, num_buffers, allocated_buffers;
unsigned plane_sizes[VB2_MAX_PLANES] = { };
bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT;
+ bool secure_mem = flags & V4L2_MEMORY_FLAG_SECURE;
bool no_previous_buffers = !q->num_buffers;
int ret;
@@ -933,6 +955,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
mutex_unlock(&q->mmap_lock);
q->waiting_for_buffers = !q->is_output;
set_queue_coherency(q, non_coherent_mem);
+ q->secure_mem = secure_mem;
} else {
if (q->memory != memory) {
dprintk(q, 1, "memory model mismatch\n");
@@ -940,6 +963,8 @@ 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_secure_mem_flags(q, secure_mem))
+ return -EINVAL;
}
num_buffers = min(*count, VB2_MAX_FRAME - q->num_buffers);
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index c7a54d82a55e..966ce74e26b3 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -685,26 +685,33 @@ static void fill_buf_caps(struct vb2_queue *q, u32 *caps)
*caps |= V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF;
if (q->allow_cache_hints && q->io_modes & VB2_MMAP)
*caps |= V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS;
+ if (q->allow_secure_mem && q->io_modes & VB2_DMABUF)
+ *caps |= V4L2_BUF_CAP_SUPPORTS_SECURE_MEM;
#ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API
if (q->supports_requests)
*caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS;
#endif
}
-static void validate_memory_flags(struct vb2_queue *q,
+static bool validate_memory_flags(struct vb2_queue *q,
int memory,
u32 *flags)
{
+ if (*flags & V4L2_MEMORY_FLAG_SECURE &&
+ (!q->allow_secure_mem || memory != V4L2_MEMORY_DMABUF)) {
+ return false;
+ }
if (!q->allow_cache_hints || memory != V4L2_MEMORY_MMAP) {
/*
- * This needs to clear V4L2_MEMORY_FLAG_NON_COHERENT only,
- * but in order to avoid bugs we zero out all bits.
+ * This needs to clear V4L2_MEMORY_FLAG_NON_COHERENT only.
*/
- *flags = 0;
- } else {
- /* Clear all unknown flags. */
- *flags &= V4L2_MEMORY_FLAG_NON_COHERENT;
+ *flags &= ~V4L2_MEMORY_FLAG_NON_COHERENT;
}
+
+ /* Clear all unknown flags. */
+ *flags &= V4L2_MEMORY_FLAG_NON_COHERENT | V4L2_MEMORY_FLAG_SECURE;
+
+ return true;
}
int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
@@ -713,7 +720,8 @@ int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
u32 flags = req->flags;
fill_buf_caps(q, &req->capabilities);
- validate_memory_flags(q, req->memory, &flags);
+ if (!validate_memory_flags(q, req->memory, &flags))
+ return -EINVAL;
req->flags = flags;
return ret ? ret : vb2_core_reqbufs(q, req->memory,
req->flags, &req->count);
@@ -748,7 +756,8 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
unsigned i;
fill_buf_caps(q, &create->capabilities);
- validate_memory_flags(q, create->memory, &create->flags);
+ if (!validate_memory_flags(q, create->memory, &create->flags))
+ return -EINVAL;
create->index = q->num_buffers;
if (create->count == 0)
return ret != -EBUSY ? ret : 0;
@@ -986,7 +995,8 @@ int vb2_ioctl_reqbufs(struct file *file, void *priv,
u32 flags = p->flags;
fill_buf_caps(vdev->queue, &p->capabilities);
- validate_memory_flags(vdev->queue, p->memory, &flags);
+ if (!validate_memory_flags(vdev->queue, p->memory, &flags))
+ return -EINVAL;
p->flags = flags;
if (res)
return res;
@@ -1010,7 +1020,8 @@ int vb2_ioctl_create_bufs(struct file *file, void *priv,
p->index = vdev->queue->num_buffers;
fill_buf_caps(vdev->queue, &p->capabilities);
- validate_memory_flags(vdev->queue, p->memory, &p->flags);
+ if (!validate_memory_flags(vdev->queue, p->memory, &p->flags))
+ return -EINVAL;
/*
* If count == 0, then just check if memory and type are valid.
* Any -EBUSY result from vb2_verify_memory_type can be mapped to 0.
--
2.18.0