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Intended for upstream testing so that we can still exercise the LMEM plumbing and !i915_ggtt_has_aperture paths. Smoke tested on Skull Canyon device. This works by allocating an intel_memory_region for a reserved portion of system memory, which we treat like LMEM. For the LMEMBAR we steal the aperture and 1:1 it map to the stolen region. To enable simply set the i915 modparam fake_lmem_start= on the kernel cmdline with the start of reserved region(see memmap=). The size of the region we can use is determined by the size of the mappable aperture, so the size of reserved region should be >= mappable_end. For now we only enable for the selftests. Depends on CONFIG_DRM_I915_UNSTABLE being enabled. eg. memmap=2G$16G i915.fake_lmem_start=0x400000000 v2: make fake_lmem_start an i915 modparam Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com> Cc: Arkadiusz Hiler <arkadiusz.hiler@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> 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/20191030173320.8850-1-matthew.auld@intel.com
29 lines
1 KiB
Text
29 lines
1 KiB
Text
# SPDX-License-Identifier: GPL-2.0-only
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config DRM_I915_UNSTABLE
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bool "Enable unstable API for early prototype development"
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depends on EXPERT
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depends on STAGING
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depends on BROKEN # should never be enabled by distros!
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# We use the dependency on !COMPILE_TEST to not be enabled in
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# allmodconfig or allyesconfig configurations
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depends on !COMPILE_TEST
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default n
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help
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Enable prototype uAPI under general discussion before they are
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finalized. Such prototypes may be withdrawn or substantially
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changed before release. They are only enabled here so that a wide
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number of interested parties (userspace driver developers) can
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verify that the uAPI meet their expectations. These uAPI should
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never be used in production.
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Recommended for driver developers _only_.
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If in the slightest bit of doubt, say "N".
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config DRM_I915_UNSTABLE_FAKE_LMEM
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bool "Enable the experimental fake lmem"
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depends on DRM_I915_UNSTABLE
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default n
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help
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Convert some system memory into a fake local memory region for
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testing.
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