| Message ID | 20210727070517.443167-7-senozhatsky@chromium.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | videobuf2: support new noncontiguous DMA API | expand |
On 27/07/2021 09:05, Sergey Senozhatsky wrote: > Preparations for future V4L2_MEMORY_FLAG_NON_COHERENT support. > > Extend vb2_core_reqbufs() parameters list to accept requests' Extend -> Extend the > ->flags, which will be used for memory coherency configuration. > > An attempt to allocate a buffer with coherency requirements > which don't match queue's consistency model will fail. which don't match -> that do not match the > > Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org> > --- > .../media/common/videobuf2/videobuf2-core.c | 38 ++++++++++++++++--- > .../media/common/videobuf2/videobuf2-v4l2.c | 5 ++- > drivers/media/dvb-core/dvb_vb2.c | 2 +- > include/media/videobuf2-core.h | 10 ++++- > 4 files changed, 44 insertions(+), 11 deletions(-) > > diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c > index 55af63d54f23..af4db310cf5e 100644 > --- a/drivers/media/common/videobuf2/videobuf2-core.c > +++ b/drivers/media/common/videobuf2/videobuf2-core.c > @@ -738,11 +738,31 @@ int vb2_verify_memory_type(struct vb2_queue *q, > } > EXPORT_SYMBOL(vb2_verify_memory_type); > > +static void set_queue_coherency(struct vb2_queue *q, bool coherent_mem) > +{ > + q->coherent_mem = 1; This I do not like: coherent memory is the default, and so I think it will be more robust if this field is renamed to non_coherent_mem and so coherent memory will be the default since this field will be cleared initially with kzalloc. Basically a similar argument that you used in patch 2/8. I also think that it improves readability, since non-coherent is the exceptional case, not the rule, and the field name corresponds with the V4L2 memory flag name. I noticed that in v1 of this series it was actually called non_coherent_mem, and it was changed in v2, actually after some comments from me. But I changed my mind on that, and I think it makes more sense to go back to calling this non_coherent_mem. Regards, Hans > + > + if (!vb2_queue_allows_cache_hints(q)) > + return; > + if (!coherent_mem) > + q->coherent_mem = 0; > +} > + > +static bool verify_coherency_flags(struct vb2_queue *q, bool coherent_mem) > +{ > + if (coherent_mem != q->coherent_mem) { > + dprintk(q, 1, "memory coherency model mismatch\n"); > + return false; > + } > + return true; > +} > + > int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, > - unsigned int *count) > + unsigned int flags, unsigned int *count) > { > unsigned int num_buffers, allocated_buffers, num_planes = 0; > unsigned plane_sizes[VB2_MAX_PLANES] = { }; > + bool coherent_mem = true; > unsigned int i; > int ret; > > @@ -757,7 +777,8 @@ 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)) { > + (q->memory != VB2_MEMORY_UNKNOWN && q->memory != memory) || > + !verify_coherency_flags(q, coherent_mem)) { > /* > * We already have buffers allocated, so first check if they > * are not in use and can be freed. > @@ -794,6 +815,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, > num_buffers = min_t(unsigned int, num_buffers, VB2_MAX_FRAME); > memset(q->alloc_devs, 0, sizeof(q->alloc_devs)); > q->memory = memory; > + set_queue_coherency(q, coherent_mem); > > /* > * Ask the driver how many buffers and planes per buffer it requires. > @@ -878,12 +900,13 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, > EXPORT_SYMBOL_GPL(vb2_core_reqbufs); > > int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, > - unsigned int *count, > + unsigned int flags, unsigned int *count, > unsigned int requested_planes, > const unsigned int requested_sizes[]) > { > unsigned int num_planes = 0, num_buffers, allocated_buffers; > unsigned plane_sizes[VB2_MAX_PLANES] = { }; > + bool coherent_mem = true; > int ret; > > if (q->num_buffers == VB2_MAX_FRAME) { > @@ -899,11 +922,14 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, > memset(q->alloc_devs, 0, sizeof(q->alloc_devs)); > q->memory = memory; > q->waiting_for_buffers = !q->is_output; > + set_queue_coherency(q, coherent_mem); > } else { > if (q->memory != memory) { > dprintk(q, 1, "memory model mismatch\n"); > return -EINVAL; > } > + if (!verify_coherency_flags(q, coherent_mem)) > + return -EINVAL; > } > > num_buffers = min(*count, VB2_MAX_FRAME - q->num_buffers); > @@ -2576,7 +2602,7 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read) > fileio->memory = VB2_MEMORY_MMAP; > fileio->type = q->type; > q->fileio = fileio; > - ret = vb2_core_reqbufs(q, fileio->memory, &fileio->count); > + ret = vb2_core_reqbufs(q, fileio->memory, 0, &fileio->count); > if (ret) > goto err_kfree; > > @@ -2633,7 +2659,7 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read) > > err_reqbufs: > fileio->count = 0; > - vb2_core_reqbufs(q, fileio->memory, &fileio->count); > + vb2_core_reqbufs(q, fileio->memory, 0, &fileio->count); > > err_kfree: > q->fileio = NULL; > @@ -2653,7 +2679,7 @@ static int __vb2_cleanup_fileio(struct vb2_queue *q) > vb2_core_streamoff(q, q->type); > q->fileio = NULL; > fileio->count = 0; > - vb2_core_reqbufs(q, fileio->memory, &fileio->count); > + vb2_core_reqbufs(q, fileio->memory, 0, &fileio->count); > kfree(fileio); > dprintk(q, 3, "file io emulator closed\n"); > } > diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c > index 2fbae9bd7b52..b4f70ddb09b0 100644 > --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c > +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c > @@ -697,7 +697,7 @@ int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) > int ret = vb2_verify_memory_type(q, req->memory, req->type); > > fill_buf_caps(q, &req->capabilities); > - return ret ? ret : vb2_core_reqbufs(q, req->memory, &req->count); > + return ret ? ret : vb2_core_reqbufs(q, req->memory, 0, &req->count); > } > EXPORT_SYMBOL_GPL(vb2_reqbufs); > > @@ -772,6 +772,7 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) > if (requested_sizes[i] == 0) > return -EINVAL; > return ret ? ret : vb2_core_create_bufs(q, create->memory, > + 0, > &create->count, > requested_planes, > requested_sizes); > @@ -974,7 +975,7 @@ int vb2_ioctl_reqbufs(struct file *file, void *priv, > return res; > if (vb2_queue_is_busy(vdev, file)) > return -EBUSY; > - res = vb2_core_reqbufs(vdev->queue, p->memory, &p->count); > + res = vb2_core_reqbufs(vdev->queue, p->memory, 0, &p->count); > /* If count == 0, then the owner has released all buffers and he > is no longer owner of the queue. Otherwise we have a new owner. */ > if (res == 0) > diff --git a/drivers/media/dvb-core/dvb_vb2.c b/drivers/media/dvb-core/dvb_vb2.c > index 6974f1731529..959d110407a4 100644 > --- a/drivers/media/dvb-core/dvb_vb2.c > +++ b/drivers/media/dvb-core/dvb_vb2.c > @@ -342,7 +342,7 @@ int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req) > > ctx->buf_siz = req->size; > ctx->buf_cnt = req->count; > - ret = vb2_core_reqbufs(&ctx->vb_q, VB2_MEMORY_MMAP, &req->count); > + ret = vb2_core_reqbufs(&ctx->vb_q, VB2_MEMORY_MMAP, 0, &req->count); > if (ret) { > ctx->state = DVB_VB2_STATE_NONE; > dprintk(1, "[%s] count=%d size=%d errno=%d\n", ctx->name, > diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h > index 66e548268242..7e748cd09b7a 100644 > --- a/include/media/videobuf2-core.h > +++ b/include/media/videobuf2-core.h > @@ -504,6 +504,8 @@ struct vb2_buf_ops { > * @allow_cache_hints: when set user-space can pass cache management hints in > * order to skip cache flush/invalidation on ->prepare() or/and > * ->finish(). > + * @coherent_mem: when cleared queue will attempt to allocate buffers using > + * non-coherent memory. > * @lock: pointer to a mutex that protects the &struct vb2_queue. The > * driver can set this to a mutex to let the v4l2 core serialize > * the queuing ioctls. If the driver wants to handle locking > @@ -583,6 +585,7 @@ struct vb2_queue { > unsigned int uses_qbuf:1; > unsigned int uses_requests:1; > unsigned int allow_cache_hints:1; > + unsigned int coherent_mem:1; > > struct mutex *lock; > void *owner; > @@ -748,6 +751,8 @@ void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb); > * vb2_core_reqbufs() - Initiate streaming. > * @q: pointer to &struct vb2_queue with videobuf2 queue. > * @memory: memory type, as defined by &enum vb2_memory. > + * @flags: auxiliary queue/buffer management flags. Currently, the only > + * used flag is %V4L2_MEMORY_FLAG_NON_COHERENT. > * @count: requested buffer count. > * > * Videobuf2 core helper to implement VIDIOC_REQBUF() operation. It is called > @@ -772,12 +777,13 @@ void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb); > * Return: returns zero on success; an error code otherwise. > */ > int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, > - unsigned int *count); > + unsigned int flags, unsigned int *count); > > /** > * vb2_core_create_bufs() - Allocate buffers and any required auxiliary structs > * @q: pointer to &struct vb2_queue with videobuf2 queue. > * @memory: memory type, as defined by &enum vb2_memory. > + * @flags: auxiliary queue/buffer management flags. > * @count: requested buffer count. > * @requested_planes: number of planes requested. > * @requested_sizes: array with the size of the planes. > @@ -795,7 +801,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, > * Return: returns zero on success; an error code otherwise. > */ > int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, > - unsigned int *count, > + unsigned int flags, unsigned int *count, > unsigned int requested_planes, > const unsigned int requested_sizes[]); > >
On (21/08/03 10:29), Hans Verkuil wrote: > > > > +static void set_queue_coherency(struct vb2_queue *q, bool coherent_mem) > > +{ > > + q->coherent_mem = 1; > > This I do not like: coherent memory is the default, and so I think it will > be more robust if this field is renamed to non_coherent_mem and so coherent > memory will be the default since this field will be cleared initially with > kzalloc. > > Basically a similar argument that you used in patch 2/8. > > I also think that it improves readability, since non-coherent is the > exceptional case, not the rule, and the field name corresponds with the > V4L2 memory flag name. > > I noticed that in v1 of this series it was actually called non_coherent_mem, > and it was changed in v2, actually after some comments from me. > > But I changed my mind on that, and I think it makes more sense to go back to > calling this non_coherent_mem. Ok, done. Hans, is this your final decision? :)
diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index 55af63d54f23..af4db310cf5e 100644 --- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -738,11 +738,31 @@ int vb2_verify_memory_type(struct vb2_queue *q, } EXPORT_SYMBOL(vb2_verify_memory_type); +static void set_queue_coherency(struct vb2_queue *q, bool coherent_mem) +{ + q->coherent_mem = 1; + + if (!vb2_queue_allows_cache_hints(q)) + return; + if (!coherent_mem) + q->coherent_mem = 0; +} + +static bool verify_coherency_flags(struct vb2_queue *q, bool coherent_mem) +{ + if (coherent_mem != q->coherent_mem) { + dprintk(q, 1, "memory coherency model mismatch\n"); + return false; + } + return true; +} + int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, - unsigned int *count) + unsigned int flags, unsigned int *count) { unsigned int num_buffers, allocated_buffers, num_planes = 0; unsigned plane_sizes[VB2_MAX_PLANES] = { }; + bool coherent_mem = true; unsigned int i; int ret; @@ -757,7 +777,8 @@ 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)) { + (q->memory != VB2_MEMORY_UNKNOWN && q->memory != memory) || + !verify_coherency_flags(q, coherent_mem)) { /* * We already have buffers allocated, so first check if they * are not in use and can be freed. @@ -794,6 +815,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, num_buffers = min_t(unsigned int, num_buffers, VB2_MAX_FRAME); memset(q->alloc_devs, 0, sizeof(q->alloc_devs)); q->memory = memory; + set_queue_coherency(q, coherent_mem); /* * Ask the driver how many buffers and planes per buffer it requires. @@ -878,12 +900,13 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, EXPORT_SYMBOL_GPL(vb2_core_reqbufs); int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, - unsigned int *count, + unsigned int flags, unsigned int *count, unsigned int requested_planes, const unsigned int requested_sizes[]) { unsigned int num_planes = 0, num_buffers, allocated_buffers; unsigned plane_sizes[VB2_MAX_PLANES] = { }; + bool coherent_mem = true; int ret; if (q->num_buffers == VB2_MAX_FRAME) { @@ -899,11 +922,14 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, memset(q->alloc_devs, 0, sizeof(q->alloc_devs)); q->memory = memory; q->waiting_for_buffers = !q->is_output; + set_queue_coherency(q, coherent_mem); } else { if (q->memory != memory) { dprintk(q, 1, "memory model mismatch\n"); return -EINVAL; } + if (!verify_coherency_flags(q, coherent_mem)) + return -EINVAL; } num_buffers = min(*count, VB2_MAX_FRAME - q->num_buffers); @@ -2576,7 +2602,7 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read) fileio->memory = VB2_MEMORY_MMAP; fileio->type = q->type; q->fileio = fileio; - ret = vb2_core_reqbufs(q, fileio->memory, &fileio->count); + ret = vb2_core_reqbufs(q, fileio->memory, 0, &fileio->count); if (ret) goto err_kfree; @@ -2633,7 +2659,7 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read) err_reqbufs: fileio->count = 0; - vb2_core_reqbufs(q, fileio->memory, &fileio->count); + vb2_core_reqbufs(q, fileio->memory, 0, &fileio->count); err_kfree: q->fileio = NULL; @@ -2653,7 +2679,7 @@ static int __vb2_cleanup_fileio(struct vb2_queue *q) vb2_core_streamoff(q, q->type); q->fileio = NULL; fileio->count = 0; - vb2_core_reqbufs(q, fileio->memory, &fileio->count); + vb2_core_reqbufs(q, fileio->memory, 0, &fileio->count); kfree(fileio); dprintk(q, 3, "file io emulator closed\n"); } diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c index 2fbae9bd7b52..b4f70ddb09b0 100644 --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c @@ -697,7 +697,7 @@ int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) int ret = vb2_verify_memory_type(q, req->memory, req->type); fill_buf_caps(q, &req->capabilities); - return ret ? ret : vb2_core_reqbufs(q, req->memory, &req->count); + return ret ? ret : vb2_core_reqbufs(q, req->memory, 0, &req->count); } EXPORT_SYMBOL_GPL(vb2_reqbufs); @@ -772,6 +772,7 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) if (requested_sizes[i] == 0) return -EINVAL; return ret ? ret : vb2_core_create_bufs(q, create->memory, + 0, &create->count, requested_planes, requested_sizes); @@ -974,7 +975,7 @@ int vb2_ioctl_reqbufs(struct file *file, void *priv, return res; if (vb2_queue_is_busy(vdev, file)) return -EBUSY; - res = vb2_core_reqbufs(vdev->queue, p->memory, &p->count); + res = vb2_core_reqbufs(vdev->queue, p->memory, 0, &p->count); /* If count == 0, then the owner has released all buffers and he is no longer owner of the queue. Otherwise we have a new owner. */ if (res == 0) diff --git a/drivers/media/dvb-core/dvb_vb2.c b/drivers/media/dvb-core/dvb_vb2.c index 6974f1731529..959d110407a4 100644 --- a/drivers/media/dvb-core/dvb_vb2.c +++ b/drivers/media/dvb-core/dvb_vb2.c @@ -342,7 +342,7 @@ int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req) ctx->buf_siz = req->size; ctx->buf_cnt = req->count; - ret = vb2_core_reqbufs(&ctx->vb_q, VB2_MEMORY_MMAP, &req->count); + ret = vb2_core_reqbufs(&ctx->vb_q, VB2_MEMORY_MMAP, 0, &req->count); if (ret) { ctx->state = DVB_VB2_STATE_NONE; dprintk(1, "[%s] count=%d size=%d errno=%d\n", ctx->name, diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index 66e548268242..7e748cd09b7a 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -504,6 +504,8 @@ struct vb2_buf_ops { * @allow_cache_hints: when set user-space can pass cache management hints in * order to skip cache flush/invalidation on ->prepare() or/and * ->finish(). + * @coherent_mem: when cleared queue will attempt to allocate buffers using + * non-coherent memory. * @lock: pointer to a mutex that protects the &struct vb2_queue. The * driver can set this to a mutex to let the v4l2 core serialize * the queuing ioctls. If the driver wants to handle locking @@ -583,6 +585,7 @@ struct vb2_queue { unsigned int uses_qbuf:1; unsigned int uses_requests:1; unsigned int allow_cache_hints:1; + unsigned int coherent_mem:1; struct mutex *lock; void *owner; @@ -748,6 +751,8 @@ void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb); * vb2_core_reqbufs() - Initiate streaming. * @q: pointer to &struct vb2_queue with videobuf2 queue. * @memory: memory type, as defined by &enum vb2_memory. + * @flags: auxiliary queue/buffer management flags. Currently, the only + * used flag is %V4L2_MEMORY_FLAG_NON_COHERENT. * @count: requested buffer count. * * Videobuf2 core helper to implement VIDIOC_REQBUF() operation. It is called @@ -772,12 +777,13 @@ void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb); * Return: returns zero on success; an error code otherwise. */ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, - unsigned int *count); + unsigned int flags, unsigned int *count); /** * vb2_core_create_bufs() - Allocate buffers and any required auxiliary structs * @q: pointer to &struct vb2_queue with videobuf2 queue. * @memory: memory type, as defined by &enum vb2_memory. + * @flags: auxiliary queue/buffer management flags. * @count: requested buffer count. * @requested_planes: number of planes requested. * @requested_sizes: array with the size of the planes. @@ -795,7 +801,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, * Return: returns zero on success; an error code otherwise. */ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, - unsigned int *count, + unsigned int flags, unsigned int *count, unsigned int requested_planes, const unsigned int requested_sizes[]);
Preparations for future V4L2_MEMORY_FLAG_NON_COHERENT support. Extend vb2_core_reqbufs() parameters list to accept requests' ->flags, which will be used for memory coherency configuration. An attempt to allocate a buffer with coherency requirements which don't match queue's consistency model will fail. Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org> --- .../media/common/videobuf2/videobuf2-core.c | 38 ++++++++++++++++--- .../media/common/videobuf2/videobuf2-v4l2.c | 5 ++- drivers/media/dvb-core/dvb_vb2.c | 2 +- include/media/videobuf2-core.h | 10 ++++- 4 files changed, 44 insertions(+), 11 deletions(-)