[Intel-gfx] [PATCH 02/21] drm/i915: Drop I915_CONTEXT_PARAM_NO_ZEROMAP

[Daniel Vetter]

On Fri, Apr 23, 2021 at 05:31:12PM -0500, Jason Ekstrand wrote:
> The idea behind this param is to support OpenCL drivers with relocations
> because OpenCL reserves 0x0 for NULL and, if we placed memory there, it
> would confuse CL kernels.  It was originally sent out as part of a patch
> series including libdrm [1] and Beignet [2] support.  However, the
> libdrm and Beignet patches never landed in their respective upstream
> projects so this API has never been used.  It's never been used in Mesa
> or any other driver, either.
> 
> Dropping this API allows us to delete a small bit of code.
> 
> [1]: https://lists.freedesktop.org/archives/intel-gfx/2015-May/067030.html
> [2]: https://lists.freedesktop.org/archives/intel-gfx/2015-May/067031.html
> 
> Signed-off-by: Jason Ekstrand <jason at jlekstrand.net>

Same thing about an igt making sure we reject these. Maybe an entire
wash-up igt which validates all the new restrictions on get/setparam
(including that after execbuf it's even more strict).
-Daniel

> ---
>  drivers/gpu/drm/i915/gem/i915_gem_context.c      | 16 ++--------------
>  .../gpu/drm/i915/gem/i915_gem_context_types.h    |  1 -
>  drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c   |  8 --------
>  include/uapi/drm/i915_drm.h                      |  4 ++++
>  4 files changed, 6 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> index e52b85b8f923d..35bcdeddfbf3f 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> @@ -1922,15 +1922,6 @@ static int ctx_setparam(struct drm_i915_file_private *fpriv,
>  	int ret = 0;
>  
>  	switch (args->param) {
> -	case I915_CONTEXT_PARAM_NO_ZEROMAP:
> -		if (args->size)
> -			ret = -EINVAL;
> -		else if (args->value)
> -			set_bit(UCONTEXT_NO_ZEROMAP, &ctx->user_flags);
> -		else
> -			clear_bit(UCONTEXT_NO_ZEROMAP, &ctx->user_flags);
> -		break;
> -
>  	case I915_CONTEXT_PARAM_NO_ERROR_CAPTURE:
>  		if (args->size)
>  			ret = -EINVAL;
> @@ -1980,6 +1971,7 @@ static int ctx_setparam(struct drm_i915_file_private *fpriv,
>  		ret = set_persistence(ctx, args);
>  		break;
>  
> +	case I915_CONTEXT_PARAM_NO_ZEROMAP:
>  	case I915_CONTEXT_PARAM_BAN_PERIOD:
>  	case I915_CONTEXT_PARAM_RINGSIZE:
>  	default:
> @@ -2360,11 +2352,6 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
>  		return -ENOENT;
>  
>  	switch (args->param) {
> -	case I915_CONTEXT_PARAM_NO_ZEROMAP:
> -		args->size = 0;
> -		args->value = test_bit(UCONTEXT_NO_ZEROMAP, &ctx->user_flags);
> -		break;
> -
>  	case I915_CONTEXT_PARAM_GTT_SIZE:
>  		args->size = 0;
>  		rcu_read_lock();
> @@ -2412,6 +2399,7 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
>  		args->value = i915_gem_context_is_persistent(ctx);
>  		break;
>  
> +	case I915_CONTEXT_PARAM_NO_ZEROMAP:
>  	case I915_CONTEXT_PARAM_BAN_PERIOD:
>  	case I915_CONTEXT_PARAM_RINGSIZE:
>  	default:
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
> index 340473aa70de0..5ae71ec936f7c 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
> @@ -129,7 +129,6 @@ struct i915_gem_context {
>  	 * @user_flags: small set of booleans controlled by the user
>  	 */
>  	unsigned long user_flags;
> -#define UCONTEXT_NO_ZEROMAP		0
>  #define UCONTEXT_NO_ERROR_CAPTURE	1
>  #define UCONTEXT_BANNABLE		2
>  #define UCONTEXT_RECOVERABLE		3
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> index 297143511f99b..b812f313422a9 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> @@ -290,7 +290,6 @@ struct i915_execbuffer {
>  	struct intel_context *reloc_context;
>  
>  	u64 invalid_flags; /** Set of execobj.flags that are invalid */
> -	u32 context_flags; /** Set of execobj.flags to insert from the ctx */
>  
>  	u64 batch_len; /** Length of batch within object */
>  	u32 batch_start_offset; /** Location within object of batch */
> @@ -541,9 +540,6 @@ eb_validate_vma(struct i915_execbuffer *eb,
>  			entry->flags |= EXEC_OBJECT_NEEDS_GTT | __EXEC_OBJECT_NEEDS_MAP;
>  	}
>  
> -	if (!(entry->flags & EXEC_OBJECT_PINNED))
> -		entry->flags |= eb->context_flags;
> -
>  	return 0;
>  }
>  
> @@ -750,10 +746,6 @@ static int eb_select_context(struct i915_execbuffer *eb)
>  	if (rcu_access_pointer(ctx->vm))
>  		eb->invalid_flags |= EXEC_OBJECT_NEEDS_GTT;
>  
> -	eb->context_flags = 0;
> -	if (test_bit(UCONTEXT_NO_ZEROMAP, &ctx->user_flags))
> -		eb->context_flags |= __EXEC_OBJECT_NEEDS_BIAS;
> -
>  	return 0;
>  }
>  
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index 6eefbc6dec01f..a0aaa8298f28d 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -1637,6 +1637,10 @@ struct drm_i915_gem_context_param {
>  	__u32 size;
>  	__u64 param;
>  #define I915_CONTEXT_PARAM_BAN_PERIOD	0x1
> +/* I915_CONTEXT_PARAM_NO_ZEROMAP has been removed.  On the off chance
> + * someone somewhere has attempted to use it, never re-use this context
> + * param number.
> + */
>  #define I915_CONTEXT_PARAM_NO_ZEROMAP	0x2
>  #define I915_CONTEXT_PARAM_GTT_SIZE	0x3
>  #define I915_CONTEXT_PARAM_NO_ERROR_CAPTURE	0x4
> -- 
> 2.31.1
> 
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> Intel-gfx at lists.freedesktop.org
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch