drm/i915/stolen: don't treat small BAR as an error

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On client platforms with reduced LMEM BAR, we should be able to continue
with driver load with reduced io_size. Instead of using the BAR size to
determine the how large stolen should be, we should instead use the
ADDR_RANGE register to figure this out(at least on platforms like DG2).
For simplicity we don't attempt to support partially mappable stolen.

v2: rearrange the io_mapping_init_wc slightly, since the stolen setup
might result in reduced io_size.

Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
Co-developed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220315181425.576828-2-matthew.auld@intel.com

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Akeem G Abodunrin 2022-03-15 18:14:20 +00:00 • committed by Matthew Auld

parent 56eda725c9

commit b8ca8fef58

2 changed files with 46 additions and 19 deletions

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62

drivers/gpu/drm/i915/gem/i915_gem_stolen.c

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3

drivers/gpu/drm/i915/i915_reg.h

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