Re: [PATCH v2 1/5] drm: Add reservation_object to drm_gem_object

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Am Sa., 2. Feb. 2019 um 16:42 Uhr schrieb Rob Herring <robh@xxxxxxxxxx>:
>
> Many users of drm_gem_object embed a struct reservation_object into
> their subclassed struct, so let's add one to struct drm_gem_object.
> This will allow removing the reservation object from the subclasses
> and removing the ->gem_prime_res_obj callback.
>
> With the addition, add a drm_gem_reservation_object_wait() helper
> function for drivers to use in wait ioctls.
>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Cc: Maxime Ripard <maxime.ripard@xxxxxxxxxxx>
> Cc: Sean Paul <sean@xxxxxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Signed-off-by: Rob Herring <robh@xxxxxxxxxx>

Reviewed-by: Christian Gmeiner <christian.gmeiner@xxxxxxxxx>

> ---
> v2:
>  - Fix missing kerneldoc
>  - Reword todo with what is left todo.
>  - Fix timeout error handling (added to drm_gem_reservation_object_wait)
>
>  Documentation/gpu/todo.rst  |  8 +++----
>  drivers/gpu/drm/drm_gem.c   | 43 +++++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/drm_prime.c |  1 +
>  include/drm/drm_gem.h       | 21 ++++++++++++++++++
>  4 files changed, 69 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst
> index 14191b64446d..c9ed55605641 100644
> --- a/Documentation/gpu/todo.rst
> +++ b/Documentation/gpu/todo.rst
> @@ -209,12 +209,12 @@ Would be great to refactor this all into a set of small common helpers.
>
>  Contact: Daniel Vetter
>
> -Put a reservation_object into drm_gem_object
> +Remove the ->gem_prime_res_obj callback
>  --------------------------------------------
>
> -This would remove the need for the ->gem_prime_res_obj callback. It would also
> -allow us to implement generic helpers for waiting for a bo, allowing for quite a
> -bit of refactoring in the various wait ioctl implementations.
> +The ->gem_prime_res_obj callback can be removed from drivers by using the
> +reservation_object in the drm_gem_object. It may also be possible to use the
> +generic drm_gem_reservation_object_wait helper for waiting for a bo.
>
>  Contact: Daniel Vetter
>
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index 8b55ece97967..b09acbc5a655 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -170,6 +170,10 @@ void drm_gem_private_object_init(struct drm_device *dev,
>         kref_init(&obj->refcount);
>         obj->handle_count = 0;
>         obj->size = size;
> +       reservation_object_init(&obj->_resv);
> +       if (!obj->resv)
> +               obj->resv = &obj->_resv;
> +
>         drm_vma_node_reset(&obj->vma_node);
>  }
>  EXPORT_SYMBOL(drm_gem_private_object_init);
> @@ -657,6 +661,44 @@ drm_gem_object_lookup(struct drm_file *filp, u32 handle)
>  }
>  EXPORT_SYMBOL(drm_gem_object_lookup);
>
> +/**
> + * drm_gem_reservation_object_wait - Wait on GEM object's reservation's objects
> + * shared and/or exclusive fences.
> + * @filep: DRM file private date
> + * @handle: userspace handle
> + * @wait_all: if true, wait on all fences, else wait on just exclusive fence
> + * @timeout: timeout value in jiffies or zero to return immediately
> + *
> + * Returns:
> + *
> + * Returns -ERESTARTSYS if interrupted, 0 if the wait timed out, or
> + * greater than 0 on success.
> + */
> +long drm_gem_reservation_object_wait(struct drm_file *filep, u32 handle,
> +                                   bool wait_all, unsigned long timeout)
> +{
> +       long ret;
> +       struct drm_gem_object *obj;
> +
> +       obj = drm_gem_object_lookup(filep, handle);
> +       if (!obj) {
> +               DRM_DEBUG("Failed to look up GEM BO %d\n", handle);
> +               return -EINVAL;
> +       }
> +
> +       ret = reservation_object_wait_timeout_rcu(obj->resv, wait_all,
> +                                                 true, timeout);
> +       if (ret == 0)
> +               ret = -ETIME;
> +       else if (ret > 0)
> +               ret = 0;
> +
> +       drm_gem_object_put_unlocked(obj);
> +
> +       return ret;
> +}
> +EXPORT_SYMBOL(drm_gem_reservation_object_wait);
> +
>  /**
>   * drm_gem_close_ioctl - implementation of the GEM_CLOSE ioctl
>   * @dev: drm_device
> @@ -821,6 +863,7 @@ drm_gem_object_release(struct drm_gem_object *obj)
>         if (obj->filp)
>                 fput(obj->filp);
>
> +       reservation_object_fini(&obj->_resv);
>         drm_gem_free_mmap_offset(obj);
>  }
>  EXPORT_SYMBOL(drm_gem_object_release);
> diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
> index 231e3f6d5f41..dc079efb3b0f 100644
> --- a/drivers/gpu/drm/drm_prime.c
> +++ b/drivers/gpu/drm/drm_prime.c
> @@ -504,6 +504,7 @@ struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
>                 .size = obj->size,
>                 .flags = flags,
>                 .priv = obj,
> +               .resv = obj->resv,
>         };
>
>         if (dev->driver->gem_prime_res_obj)
> diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
> index c95727425284..25f1ff2df464 100644
> --- a/include/drm/drm_gem.h
> +++ b/include/drm/drm_gem.h
> @@ -35,6 +35,7 @@
>   */
>
>  #include <linux/kref.h>
> +#include <linux/reservation.h>
>
>  #include <drm/drm_vma_manager.h>
>
> @@ -262,6 +263,24 @@ struct drm_gem_object {
>          */
>         struct dma_buf_attachment *import_attach;
>
> +       /**
> +        * @resv:
> +        *
> +        * Pointer to reservation object associated with the this GEM object.
> +        *
> +        * Normally (@resv == &@_resv) except for imported GEM objects.
> +        */
> +       struct reservation_object *resv;
> +
> +       /**
> +        * @_resv:
> +        *
> +        * A reservation object for this GEM object.
> +        *
> +        * This is unused for imported GEM objects.
> +        */
> +       struct reservation_object _resv;
> +
>         /**
>          * @funcs:
>          *
> @@ -363,6 +382,8 @@ void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
>                 bool dirty, bool accessed);
>
>  struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle);
> +long drm_gem_reservation_object_wait(struct drm_file *filep, u32 handle,
> +                                   bool wait_all, unsigned long timeout);
>  int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
>                             u32 handle, u64 *offset);
>  int drm_gem_dumb_destroy(struct drm_file *file,
> --
> 2.19.1
>


-- 
greets
--
Christian Gmeiner, MSc

https://christian-gmeiner.info



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