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drm/i915/ttm: Introduce a TTM i915 gem object backend

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Most logical place to introduce TTM buffer objects is as an i915
gem object backend. We need to add some ops to account for added
functionality like delayed delete and LRU list manipulation.

Initially we support only LMEM and SYSTEM memory, but SYSTEM
(which in this case means evicted LMEM objects) is not
visible to i915 GEM yet. The plan is to move the i915 gem system region
over to the TTM system memory type in upcoming patches.

We set up GPU bindings directly both from LMEM and from the system region,
as there is no need to use the legacy TTM_TT memory type. We reserve
that for future porting of GGTT bindings to TTM.

Remove the old lmem backend.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210610070152.572423-2-thomas.hellstrom@linux.intel.com
This commit is contained in:
Thomas Hellström
2021-06-10 09:01:49 +02:00
committed by Maarten Lankhorst
parent 1bd8a7dc28
commit 213d509277
16 changed files with 738 additions and 161 deletions
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9
drivers/gpu/drm/i915/gem/i915_gem_create.c
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@@ -85,13 +85,10 @@ i915_gem_setup(struct drm_i915_gem_object *obj, u64 size)
return -E2BIG;
/*
* For now resort to CPU based clearing for device local-memory, in the
* near future this will use the blitter engine for accelerated, GPU
* based clearing.
* I915_BO_ALLOC_USER will make sure the object is cleared before
* any user access.
*/
flags = 0;
if (mr->type == INTEL_MEMORY_LOCAL)
flags = I915_BO_ALLOC_CPU_CLEAR;
flags = I915_BO_ALLOC_USER;
ret = mr->ops->init_object(mr, obj, size, flags);
if (ret)