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author | Matthew Auld <matthew.auld@intel.com> | 2019-10-30 17:33:20 +0000 |
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committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-10-31 20:41:47 +0000 |
commit | 1629224324b6cab6f7f96e839c9b57b74cfd8349 (patch) | |
tree | 4c701026f748218e1fb583a3938bf85a5dcdd654 /drivers/gpu/drm/i915/intel_region_lmem.h | |
parent | drm/i915/dp: Do not switch aux to TBT mode for non-TC ports (diff) | |
download | linux-dev-1629224324b6cab6f7f96e839c9b57b74cfd8349.tar.xz linux-dev-1629224324b6cab6f7f96e839c9b57b74cfd8349.zip |
drm/i915/lmem: add the fake lmem region
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
Diffstat (limited to '')
-rw-r--r-- | drivers/gpu/drm/i915/intel_region_lmem.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_region_lmem.h b/drivers/gpu/drm/i915/intel_region_lmem.h index ed2a3bab6443..213def7c7b8a 100644 --- a/drivers/gpu/drm/i915/intel_region_lmem.h +++ b/drivers/gpu/drm/i915/intel_region_lmem.h @@ -6,6 +6,11 @@ #ifndef __INTEL_REGION_LMEM_H #define __INTEL_REGION_LMEM_H +struct drm_i915_private; + extern const struct intel_memory_region_ops intel_region_lmem_ops; +struct intel_memory_region * +intel_setup_fake_lmem(struct drm_i915_private *i915); + #endif /* !__INTEL_REGION_LMEM_H */ |