[Intel-gfx] [RFC v4 16/25] drm: Make ioctls available for in-kernel clients
Daniel Vetter
daniel at ffwll.ch
Mon Apr 16 09:04:28 UTC 2018
On Sat, Apr 14, 2018 at 01:53:09PM +0200, Noralf Trønnes wrote:
> Make ioctl wrappers for functions that will be used by the in-kernel API.
> The following functions are touched:
> - drm_mode_create_dumb_ioctl()
> - drm_mode_destroy_dumb_ioctl()
> - drm_mode_addfb2()
> - drm_mode_rmfb()
> - drm_prime_handle_to_fd_ioctl()
>
> drm_mode_addfb2() also gets the ability to override the debug name.
>
> Signed-off-by: Noralf Trønnes <noralf at tronnes.org>
> ---
> drivers/gpu/drm/drm_crtc_internal.h | 18 ++++++++++---
> drivers/gpu/drm/drm_dumb_buffers.c | 33 ++++++++++++++++--------
> drivers/gpu/drm/drm_framebuffer.c | 50 ++++++++++++++++++++++++-------------
> drivers/gpu/drm/drm_internal.h | 3 +++
> drivers/gpu/drm/drm_ioc32.c | 2 +-
> drivers/gpu/drm/drm_ioctl.c | 4 +--
> drivers/gpu/drm/drm_prime.c | 13 +++++++---
> 7 files changed, 84 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
> index 3c2b82865ad2..8f8886ac0e4d 100644
> --- a/drivers/gpu/drm/drm_crtc_internal.h
> +++ b/drivers/gpu/drm/drm_crtc_internal.h
> @@ -62,6 +62,12 @@ int drm_mode_getresources(struct drm_device *dev,
>
>
> /* drm_dumb_buffers.c */
> +int drm_mode_create_dumb(struct drm_device *dev,
> + struct drm_mode_create_dumb *args,
> + struct drm_file *file_priv);
> +int drm_mode_destroy_dumb(struct drm_device *dev, u32 handle,
> + struct drm_file *file_priv);
> +
> /* IOCTLs */
> int drm_mode_create_dumb_ioctl(struct drm_device *dev,
> void *data, struct drm_file *file_priv);
> @@ -163,14 +169,18 @@ int drm_framebuffer_check_src_coords(uint32_t src_x, uint32_t src_y,
> const struct drm_framebuffer *fb);
> void drm_fb_release(struct drm_file *file_priv);
>
> +int drm_mode_addfb2(struct drm_device *dev, struct drm_mode_fb_cmd2 *r,
> + struct drm_file *file_priv, const char *comm);
> +int drm_mode_rmfb(struct drm_device *dev, u32 fb_id,
> + struct drm_file *file_priv);
>
> /* IOCTL */
> int drm_mode_addfb(struct drm_device *dev,
> void *data, struct drm_file *file_priv);
> -int drm_mode_addfb2(struct drm_device *dev,
> - void *data, struct drm_file *file_priv);
> -int drm_mode_rmfb(struct drm_device *dev,
> - void *data, struct drm_file *file_priv);
> +int drm_mode_addfb2_ioctl(struct drm_device *dev,
> + void *data, struct drm_file *file_priv);
> +int drm_mode_rmfb_ioctl(struct drm_device *dev,
> + void *data, struct drm_file *file_priv);
> int drm_mode_getfb(struct drm_device *dev,
> void *data, struct drm_file *file_priv);
> int drm_mode_dirtyfb_ioctl(struct drm_device *dev,
> diff --git a/drivers/gpu/drm/drm_dumb_buffers.c b/drivers/gpu/drm/drm_dumb_buffers.c
> index 39ac15ce4702..eed9687b8698 100644
> --- a/drivers/gpu/drm/drm_dumb_buffers.c
> +++ b/drivers/gpu/drm/drm_dumb_buffers.c
> @@ -53,10 +53,10 @@
> * a hardware-specific ioctl to allocate suitable buffer objects.
> */
>
> -int drm_mode_create_dumb_ioctl(struct drm_device *dev,
> - void *data, struct drm_file *file_priv)
> +int drm_mode_create_dumb(struct drm_device *dev,
> + struct drm_mode_create_dumb *args,
> + struct drm_file *file_priv)
> {
> - struct drm_mode_create_dumb *args = data;
> u32 cpp, stride, size;
>
> if (!dev->driver->dumb_create)
> @@ -91,6 +91,12 @@ int drm_mode_create_dumb_ioctl(struct drm_device *dev,
> return dev->driver->dumb_create(file_priv, dev, args);
> }
>
> +int drm_mode_create_dumb_ioctl(struct drm_device *dev,
> + void *data, struct drm_file *file_priv)
> +{
> + return drm_mode_create_dumb(dev, data, file_priv);
> +}
> +
> /**
> * drm_mode_mmap_dumb_ioctl - create an mmap offset for a dumb backing storage buffer
> * @dev: DRM device
> @@ -122,17 +128,22 @@ int drm_mode_mmap_dumb_ioctl(struct drm_device *dev,
> &args->offset);
> }
>
> +int drm_mode_destroy_dumb(struct drm_device *dev, u32 handle,
> + struct drm_file *file_priv)
> +{
> + if (!dev->driver->dumb_create)
> + return -ENOSYS;
> +
> + if (dev->driver->dumb_destroy)
> + return dev->driver->dumb_destroy(file_priv, dev, handle);
> + else
> + return drm_gem_dumb_destroy(file_priv, dev, handle);
> +}
> +
> int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
> void *data, struct drm_file *file_priv)
> {
> struct drm_mode_destroy_dumb *args = data;
>
> - if (!dev->driver->dumb_create)
> - return -ENOSYS;
> -
> - if (dev->driver->dumb_destroy)
> - return dev->driver->dumb_destroy(file_priv, dev, args->handle);
> - else
> - return drm_gem_dumb_destroy(file_priv, dev, args->handle);
> + return drm_mode_destroy_dumb(dev, args->handle, file_priv);
> }
> -
> diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
> index 8c4d32adcc17..16769e4db5c0 100644
> --- a/drivers/gpu/drm/drm_framebuffer.c
> +++ b/drivers/gpu/drm/drm_framebuffer.c
> @@ -125,7 +125,7 @@ int drm_mode_addfb(struct drm_device *dev,
> dev->driver->driver_features & DRIVER_PREFER_XBGR_30BPP)
> r.pixel_format = DRM_FORMAT_XBGR2101010;
>
> - ret = drm_mode_addfb2(dev, &r, file_priv);
> + ret = drm_mode_addfb2_ioctl(dev, &r, file_priv);
> if (ret)
> return ret;
>
> @@ -310,23 +310,23 @@ drm_internal_framebuffer_create(struct drm_device *dev,
>
> /**
> * drm_mode_addfb2 - add an FB to the graphics configuration
> - * @dev: drm device for the ioctl
> - * @data: data pointer for the ioctl
> - * @file_priv: drm file for the ioctl call
> + * @dev: drm device
> + * @r: pointer to request structure
> + * @file_priv: drm file
> + * @comm: optionally override the allocator name used for debug output
> *
> * Add a new FB to the specified CRTC, given a user request with format. This is
> * the 2nd version of the addfb ioctl, which supports multi-planar framebuffers
> * and uses fourcc codes as pixel format specifiers.
> *
> - * Called by the user via ioctl.
> + * Called by the user via ioctl, or by an in-kernel client.
> *
> * Returns:
> * Zero on success, negative errno on failure.
> */
> -int drm_mode_addfb2(struct drm_device *dev,
> - void *data, struct drm_file *file_priv)
> +int drm_mode_addfb2(struct drm_device *dev, struct drm_mode_fb_cmd2 *r,
> + struct drm_file *file_priv, const char *comm)
API bikeshed: I'd drop the 2 (it's not relevant for in-kernel users), and
maybe return the handle right away to avoid callers having to do silly
stuff? If the return value is 0, then something failed.
Could even make @r const, if we do a quick on-stack copy to reinforce that
idea.
But feel free to ignore, probably not making things better here :-)
> {
> - struct drm_mode_fb_cmd2 *r = data;
> struct drm_framebuffer *fb;
>
> if (!drm_core_check_feature(dev, DRIVER_MODESET))
> @@ -336,6 +336,9 @@ int drm_mode_addfb2(struct drm_device *dev,
> if (IS_ERR(fb))
> return PTR_ERR(fb);
>
> + if (comm)
> + strscpy(fb->comm, comm, TASK_COMM_LEN);
> +
> DRM_DEBUG_KMS("[FB:%d]\n", fb->base.id);
> r->fb_id = fb->base.id;
>
> @@ -347,6 +350,12 @@ int drm_mode_addfb2(struct drm_device *dev,
> return 0;
> }
>
> +int drm_mode_addfb2_ioctl(struct drm_device *dev,
> + void *data, struct drm_file *file_priv)
> +{
> + return drm_mode_addfb2(dev, data, file_priv, NULL);
> +}
> +
> struct drm_mode_rmfb_work {
> struct work_struct work;
> struct list_head fbs;
> @@ -367,29 +376,28 @@ static void drm_mode_rmfb_work_fn(struct work_struct *w)
>
> /**
> * drm_mode_rmfb - remove an FB from the configuration
> - * @dev: drm device for the ioctl
> - * @data: data pointer for the ioctl
> - * @file_priv: drm file for the ioctl call
> + * @dev: drm device
> + * @fb_id: id of framebuffer to remove
> + * @file_priv: drm file
> *
> - * Remove the FB specified by the user.
> + * Remove the specified FB.
> *
> - * Called by the user via ioctl.
> + * Called by the user via ioctl, or by an in-kernel client.
> *
> * Returns:
> * Zero on success, negative errno on failure.
> */
> -int drm_mode_rmfb(struct drm_device *dev,
> - void *data, struct drm_file *file_priv)
> +int drm_mode_rmfb(struct drm_device *dev, u32 fb_id,
> + struct drm_file *file_priv)
> {
> struct drm_framebuffer *fb = NULL;
> struct drm_framebuffer *fbl = NULL;
> - uint32_t *id = data;
> int found = 0;
>
> if (!drm_core_check_feature(dev, DRIVER_MODESET))
> return -EINVAL;
>
> - fb = drm_framebuffer_lookup(dev, file_priv, *id);
> + fb = drm_framebuffer_lookup(dev, file_priv, fb_id);
> if (!fb)
> return -ENOENT;
>
> @@ -435,6 +443,14 @@ int drm_mode_rmfb(struct drm_device *dev,
> return -ENOENT;
> }
>
> +int drm_mode_rmfb_ioctl(struct drm_device *dev,
> + void *data, struct drm_file *file_priv)
> +{
> + uint32_t *fb_id = data;
> +
> + return drm_mode_rmfb(dev, *fb_id, file_priv);
> +}
> +
> /**
> * drm_mode_getfb - get FB info
> * @dev: drm device for the ioctl
> diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
> index 40179c5fc6b8..3f5d7706bcc9 100644
> --- a/drivers/gpu/drm/drm_internal.h
> +++ b/drivers/gpu/drm/drm_internal.h
> @@ -37,6 +37,9 @@ void drm_pci_agp_destroy(struct drm_device *dev);
> int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master);
>
> /* drm_prime.c */
> +int drm_prime_handle_to_fd(struct drm_device *dev,
> + struct drm_prime_handle *args,
> + struct drm_file *file_priv);
> int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file_priv);
> int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data,
> diff --git a/drivers/gpu/drm/drm_ioc32.c b/drivers/gpu/drm/drm_ioc32.c
> index f8e96e648acf..576d00b7dad5 100644
> --- a/drivers/gpu/drm/drm_ioc32.c
> +++ b/drivers/gpu/drm/drm_ioc32.c
> @@ -884,7 +884,7 @@ static int compat_drm_mode_addfb2(struct file *file, unsigned int cmd,
> sizeof(req64.modifier)))
> return -EFAULT;
>
> - err = drm_ioctl_kernel(file, drm_mode_addfb2, &req64,
> + err = drm_ioctl_kernel(file, drm_mode_addfb2_ioctl, &req64,
> DRM_CONTROL_ALLOW|DRM_UNLOCKED);
> if (err)
> return err;
> diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
> index af782911c505..c69fda5d3875 100644
> --- a/drivers/gpu/drm/drm_ioctl.c
> +++ b/drivers/gpu/drm/drm_ioctl.c
> @@ -635,8 +635,8 @@ static const struct drm_ioctl_desc drm_ioctls[] = {
> DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
> DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
> DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
> - DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
> - DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
> + DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
> + DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
> DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
> DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
> DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
> diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
> index caf675e3e692..e6052ab2bec4 100644
> --- a/drivers/gpu/drm/drm_prime.c
> +++ b/drivers/gpu/drm/drm_prime.c
> @@ -866,11 +866,10 @@ int drm_gem_prime_fd_to_handle(struct drm_device *dev,
Like with the dumb ioctls you probably want to unwrap this some more here
for the prime stuff. I don't think you want the actual fd, but just the
underlying struct dma_buf.
Unfortunately this means a bit of rework, since atm the
drm_driver->handle_to_fd also gives us the fd, not the dma_buf. Here's
what we need (assuming we really need struct dma_buf, and not just a gem
bo, which is much easier to get at):
- Change the drm_driver->handle_to_fd interface to handle_to_dma_buf, and
put the final dma_buf_fd into drm_prime_handle_to_fd_ioctl. Since
dma_buf_fd should already be the very last step (otherwise an
implementation is most likely buggy) this shouldn't be a huge step.
If dma_buf_fd fails, then we just do a dma_but_put (aka the
->handle_to_dma_buf callback needs to give us a reference we can use).
- For the internal function just call ->handle_to_dmabuf directly, but
don't convert to an fd.
- Similar for the other direction. But I think we don't really need that:
We start with the handle from the dumb api, going back to the handle
shouldn't ever be needed. Probably best to just remove that.
We can't just create file-descriptors in random calling context (userspace
might get upset, no idea what happens from kernel threads).
The dumb buffer internal interfaces lgtm.
-Daniel
> }
> EXPORT_SYMBOL(drm_gem_prime_fd_to_handle);
>
> -int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
> - struct drm_file *file_priv)
> +int drm_prime_handle_to_fd(struct drm_device *dev,
> + struct drm_prime_handle *args,
> + struct drm_file *file_priv)
> {
> - struct drm_prime_handle *args = data;
> -
> if (!drm_core_check_feature(dev, DRIVER_PRIME))
> return -EINVAL;
>
> @@ -885,6 +884,12 @@ int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
> args->handle, args->flags, &args->fd);
> }
>
> +int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
> + struct drm_file *file_priv)
> +{
> + return drm_prime_handle_to_fd(dev, data, file_priv);
> +}
> +
> int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file_priv)
> {
> --
> 2.15.1
>
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> dri-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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