Re: [PATCH] drm/i915: Kill the fake lmem support

[Lucas De Marchi <lucas.demarchi@xxxxxxxxx>]

On Wed, Feb 16, 2022 at 03:18:49PM -0800, Lucas De Marchi wrote:
> This was useful for early development of lmem, but it's not used
> anymore, so remove it.
>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
> Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/Kconfig.unstable       |   8 --
> drivers/gpu/drm/i915/gt/intel_gt.c          |   2 -
> drivers/gpu/drm/i915/gt/intel_region_lmem.c | 112 +-------------------
> drivers/gpu/drm/i915/gt/intel_region_lmem.h |   3 -
> drivers/gpu/drm/i915/i915_driver.c          |  15 ---
> drivers/gpu/drm/i915/i915_params.c          |   5 -
> drivers/gpu/drm/i915/i915_params.h          |   1 -
> 7 files changed, 2 insertions(+), 144 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/Kconfig.unstable b/drivers/gpu/drm/i915/Kconfig.unstable
> index 0c2276155c2b..cf151a297ed7 100644
> --- a/drivers/gpu/drm/i915/Kconfig.unstable
> +++ b/drivers/gpu/drm/i915/Kconfig.unstable
> @@ -19,11 +19,3 @@ config DRM_I915_UNSTABLE
> 	  Recommended for driver developers _only_.
>
> 	  If in the slightest bit of doubt, say "N".
> -
> -config DRM_I915_UNSTABLE_FAKE_LMEM
> -	bool "Enable the experimental fake lmem"
> -	depends on DRM_I915_UNSTABLE
> -	default n
> -	help
> -	  Convert some system memory into a fake local memory region for
> -	  testing.
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
> index e8403fa53909..325ac15439eb 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt.c
> @@ -65,8 +65,6 @@ int intel_gt_probe_lmem(struct intel_gt *gt)
> 	int err;
>
> 	mem = intel_gt_setup_lmem(gt);
> -	if (mem == ERR_PTR(-ENODEV))
> -		mem = intel_gt_setup_fake_lmem(gt);
> 	if (IS_ERR(mem)) {
> 		err = PTR_ERR(mem);
> 		if (err == -ENODEV)
> diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
> index cb3f66707b21..df3856e09598 100644
> --- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
> +++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
> @@ -13,60 +13,6 @@
> #include "gem/i915_gem_ttm.h"
> #include "gt/intel_gt.h"
>
> -static int init_fake_lmem_bar(struct intel_memory_region *mem)
> -{
> -	struct drm_i915_private *i915 = mem->i915;
> -	struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
> -	unsigned long n;
> -	int ret;
> -
> -	/* We want to 1:1 map the mappable aperture to our reserved region */
> -
> -	mem->fake_mappable.start = 0;
> -	mem->fake_mappable.size = resource_size(&mem->region);
> -	mem->fake_mappable.color = I915_COLOR_UNEVICTABLE;

I forgot to remove fake_mappable and remap_addr fields from the struct.
I will send a v2 later if people agree to remove the fake lmem.

Lucas De Marchi