diff options
| author | Matthew Auld <matthew.auld@intel.com> | 2019-10-30 17:33:20 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-10-31 20:41:47 +0000 |
| commit | 1629224324b6cab6f7f96e839c9b57b74cfd8349 (patch) | |
| tree | 4c701026f748218e1fb583a3938bf85a5dcdd654 /drivers/gpu/drm/i915/Kconfig.unstable | |
| parent | 49748264826ff4cc7f0ebbdd6b0d1a36b13b1cee (diff) | |
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/Kconfig.unstable')
| -rw-r--r-- | drivers/gpu/drm/i915/Kconfig.unstable | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/Kconfig.unstable b/drivers/gpu/drm/i915/Kconfig.unstable index cf151a297ed7..0c2276155c2b 100644 --- a/drivers/gpu/drm/i915/Kconfig.unstable +++ b/drivers/gpu/drm/i915/Kconfig.unstable @@ -19,3 +19,11 @@ config DRM_I915_UNSTABLE Recommended for driver developers _only_. If in the slightest bit of doubt, say "N". + +config DRM_I915_UNSTABLE_FAKE_LMEM + bool "Enable the experimental fake lmem" + depends on DRM_I915_UNSTABLE + default n + help + Convert some system memory into a fake local memory region for + testing. |