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drm/i915: setup the LMEM region

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Hook up the LMEM region. Addresses will start from zero, and for CPU
access we get LMEM_BAR which is just a 1:1 mapping of said region.

Based on a patch from Michel Thierry.

v2 by Jani:
- use intel_uncore_read/intel_uncore_write
- remove trailing blank line

v3: s/drm_info/drm_dbg for info which in non-pertinent for the user

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20210127131417.393872-2-matthew.auld@intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Matthew Auld 2021-01-27 13:14:11 +00:00 committed by Daniel Vetter
parent 2dfcc7f4e9
commit a50ca39fbd
3 changed files with 41 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/i915/gt/intel_gt.c
View File

@ -46,7 +46,9 @@ int intel_gt_probe_lmem(struct intel_gt *gt)
int id;
int err;
mem = intel_gt_setup_fake_lmem(gt);
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)

36
drivers/gpu/drm/i915/gt/intel_region_lmem.c
View File

@ -142,3 +142,39 @@ intel_gt_setup_fake_lmem(struct intel_gt *gt)
return mem;
}
static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
{
struct drm_i915_private *i915 = gt->i915;
struct pci_dev *pdev = i915->drm.pdev;
struct intel_memory_region *mem;
resource_size_t io_start;
resource_size_t size;
if (!IS_DGFX(i915))
return ERR_PTR(-ENODEV);
io_start = pci_resource_start(pdev, 2);
size = pci_resource_len(pdev, 2);
mem = intel_memory_region_create(i915,
0,
size,
I915_GTT_PAGE_SIZE_4K,
io_start,
&intel_region_lmem_ops);
if (IS_ERR(mem))
return mem;
drm_dbg(&i915->drm, "Local memory: %pR\n", &mem->region);
drm_dbg(&i915->drm, "Local memory IO start: %pa\n",
&mem->io_start);
drm_info(&i915->drm, "Local memory available: %pa\n", &size);
return mem;
}
struct intel_memory_region *intel_gt_setup_lmem(struct intel_gt *gt)
{
return setup_lmem(gt);
}

2
drivers/gpu/drm/i915/gt/intel_region_lmem.h
View File

@ -8,6 +8,8 @@
struct intel_gt;
struct intel_memory_region *intel_gt_setup_lmem(struct intel_gt *gt);
struct intel_memory_region *
intel_gt_setup_fake_lmem(struct intel_gt *gt);