Re: [Intel-gfx] [PATCH v7 20/20] drm/i915/vm_bind: Async vm_unbind support

[Andi Shyti <andi.shyti@linux.intel.com>]

Hi Niranjana,

On Sat, Nov 12, 2022 at 11:57:32PM -0800, Niranjana Vishwanathapura wrote:
> Asynchronously unbind the vma upon vm_unbind call.
> Fall back to synchronous unbind if backend doesn't support
> async unbind or if async unbind fails.
> 
> No need for vm_unbind out fence support as i915 will internally
> handle all sequencing and user need not try to sequence any
> operation with the unbind completion.
> 
> v2: use i915_vma_destroy_async in vm_unbind ioctl
> 
> Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
> ---
>  .../drm/i915/gem/i915_gem_vm_bind_object.c    |  2 +-
>  drivers/gpu/drm/i915/i915_vma.c               | 51 +++++++++++++++++--
>  drivers/gpu/drm/i915/i915_vma.h               |  1 +
>  include/uapi/drm/i915_drm.h                   |  3 +-
>  4 files changed, 51 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
> index d87d1210365b..36651b447966 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
> @@ -210,7 +210,7 @@ static int i915_gem_vm_unbind_vma(struct i915_address_space *vm,
>  	 */
>  	obj = vma->obj;
>  	i915_gem_object_lock(obj, NULL);
> -	i915_vma_destroy(vma);
> +	i915_vma_destroy_async(vma);
>  	i915_gem_object_unlock(obj);
>  
>  	i915_gem_object_put(obj);
> diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
> index 7cf77c67d755..483d25f2425c 100644
> --- a/drivers/gpu/drm/i915/i915_vma.c
> +++ b/drivers/gpu/drm/i915/i915_vma.c
> @@ -42,6 +42,8 @@
>  #include "i915_vma.h"
>  #include "i915_vma_resource.h"
>  
> +static struct dma_fence *__i915_vma_unbind_async(struct i915_vma *vma);
> +
>  static inline void assert_vma_held_evict(const struct i915_vma *vma)
>  {
>  	/*
> @@ -1713,7 +1715,7 @@ void i915_vma_reopen(struct i915_vma *vma)
>  	spin_unlock_irq(&gt->closed_lock);
>  }
>  
> -static void force_unbind(struct i915_vma *vma)
> +static void force_unbind(struct i915_vma *vma, bool async)

I still like the defines on this, they look cleaner, but it's a
matter of taste.

Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>

Andi