[Intel-gfx] [PATCH 1/3] drm/i915: Remove defunct i915->vm_list

[Tvrtko Ursulin]

On 05/07/2018 07:56, Chris Wilson wrote:
> No longer used and can be removed. One less global that currently
> demands struct_mutex protection.
> 
> References: e9e7dc4144cd ("drm/i915/gtt: Make gen6 page directories evictable")
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---
>   drivers/gpu/drm/i915/i915_drv.h           | 1 -
>   drivers/gpu/drm/i915/i915_gem_gtt.c       | 5 -----
>   drivers/gpu/drm/i915/i915_gem_gtt.h       | 1 -
>   drivers/gpu/drm/i915/selftests/mock_gtt.c | 3 ---
>   4 files changed, 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index e5a0a65ec2e9..550e86dfbfe8 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1744,7 +1744,6 @@ struct drm_i915_private {
>   	struct drm_atomic_state *modeset_restore_state;
>   	struct drm_modeset_acquire_ctx reset_ctx;
>   
> -	struct list_head vm_list; /* Global list of all address spaces */
>   	struct i915_ggtt ggtt; /* VM representing the global address space */
>   
>   	struct i915_gem_mm mm;
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index 3326b4e29b5b..2f10f5580230 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -540,8 +540,6 @@ static void i915_address_space_init(struct i915_address_space *vm,
>   	INIT_LIST_HEAD(&vm->active_list);
>   	INIT_LIST_HEAD(&vm->inactive_list);
>   	INIT_LIST_HEAD(&vm->unbound_list);
> -
> -	list_add_tail(&vm->global_link, &dev_priv->vm_list);
>   }
>   
>   static void i915_address_space_fini(struct i915_address_space *vm)
> @@ -553,7 +551,6 @@ static void i915_address_space_fini(struct i915_address_space *vm)
>   	spin_unlock(&vm->free_pages.lock);
>   
>   	drm_mm_takedown(&vm->mm);
> -	list_del(&vm->global_link);
>   }
>   
>   static int __setup_page_dma(struct i915_address_space *vm,
> @@ -3572,8 +3569,6 @@ int i915_ggtt_init_hw(struct drm_i915_private *dev_priv)
>   
>   	stash_init(&dev_priv->mm.wc_stash);
>   
> -	INIT_LIST_HEAD(&dev_priv->vm_list);
> -
>   	/* Note that we use page colouring to enforce a guard page at the
>   	 * end of the address space. This is required as the CS may prefetch
>   	 * beyond the end of the batch buffer, across the page boundary,
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
> index f298e72b79ca..feda45dfd481 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.h
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
> @@ -288,7 +288,6 @@ struct i915_address_space {
>   	 * assign blame.
>   	 */
>   	struct drm_i915_file_private *file;
> -	struct list_head global_link;
>   	u64 total;		/* size addr space maps (ex. 2GB for ggtt) */
>   	u64 reserved;		/* size addr space reserved */
>   
> diff --git a/drivers/gpu/drm/i915/selftests/mock_gtt.c b/drivers/gpu/drm/i915/selftests/mock_gtt.c
> index 0da5b8c6d912..07df5c399ec1 100644
> --- a/drivers/gpu/drm/i915/selftests/mock_gtt.c
> +++ b/drivers/gpu/drm/i915/selftests/mock_gtt.c
> @@ -74,7 +74,6 @@ mock_ppgtt(struct drm_i915_private *i915,
>   	INIT_LIST_HEAD(&ppgtt->vm.inactive_list);
>   	INIT_LIST_HEAD(&ppgtt->vm.unbound_list);
>   
> -	INIT_LIST_HEAD(&ppgtt->vm.global_link);
>   	drm_mm_init(&ppgtt->vm.mm, 0, ppgtt->vm.total);
>   
>   	ppgtt->vm.clear_range = nop_clear_range;
> @@ -106,8 +105,6 @@ void mock_init_ggtt(struct drm_i915_private *i915)
>   {
>   	struct i915_ggtt *ggtt = &i915->ggtt;
>   
> -	INIT_LIST_HEAD(&i915->vm_list);
> -
>   	ggtt->vm.i915 = i915;
>   
>   	ggtt->gmadr = (struct resource) DEFINE_RES_MEM(0, 2048 * PAGE_SIZE);
> 

No list iterators removed so easy to establish it is indeed unused. (Or 
won't compile.) :)

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Regards,

Tvrtko