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| author | Matthew Auld <matthew.auld@intel.com> | 2019-10-30 20:33:20 +0300 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-10-31 23:41:47 +0300 |
| commit | 1629224324b6cab6f7f96e839c9b57b74cfd8349 (patch) | |
| tree | 4c701026f748218e1fb583a3938bf85a5dcdd654 /drivers/gpu/drm/i915/i915_params.h | |
| parent | 49748264826ff4cc7f0ebbdd6b0d1a36b13b1cee (diff) | |
| download | linux-1629224324b6cab6f7f96e839c9b57b74cfd8349.tar.xz | |
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 'drivers/gpu/drm/i915/i915_params.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_params.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h index a276317ad74b..31b88f297fbc 100644 --- a/drivers/gpu/drm/i915/i915_params.h +++ b/drivers/gpu/drm/i915/i915_params.h @@ -66,6 +66,7 @@ struct drm_printer; param(int, fastboot, -1) \ param(int, enable_dpcd_backlight, 0) \ param(char *, force_probe, CONFIG_DRM_I915_FORCE_PROBE) \ + param(unsigned long, fake_lmem_start, 0) \ /* leave bools at the end to not create holes */ \ param(bool, alpha_support, IS_ENABLED(CONFIG_DRM_I915_ALPHA_SUPPORT)) \ param(bool, enable_hangcheck, true) \ |