diff options
| author | Matthew Auld <matthew.auld@intel.com> | 2019-10-30 18:33:20 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-10-31 21:41:47 +0100 |
| commit | 1629224324b6cab6f7f96e839c9b57b74cfd8349 (patch) | |
| tree | 4c701026f748218e1fb583a3938bf85a5dcdd654 /drivers/gpu/drm/i915/i915_params.c | |
| parent | drm/i915/dp: Do not switch aux to TBT mode for non-TC ports (diff) | |
| download | linux-1629224324b6cab6f7f96e839c9b57b74cfd8349.tar.xz linux-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 'drivers/gpu/drm/i915/i915_params.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_params.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c index 3fa79adb2c1c..1dd1f3652795 100644 --- a/drivers/gpu/drm/i915/i915_params.c +++ b/drivers/gpu/drm/i915/i915_params.c @@ -179,6 +179,11 @@ i915_param_named(enable_gvt, bool, 0400, "Enable support for Intel GVT-g graphics virtualization host support(default:false)"); #endif +#if IS_ENABLED(CONFIG_DRM_I915_UNSTABLE_FAKE_LMEM) +i915_param_named_unsafe(fake_lmem_start, ulong, 0600, + "Fake LMEM start offset (default: 0)"); +#endif + static __always_inline void _print_param(struct drm_printer *p, const char *name, const char *type, @@ -190,6 +195,8 @@ static __always_inline void _print_param(struct drm_printer *p, drm_printf(p, "i915.%s=%d\n", name, *(const int *)x); else if (!__builtin_strcmp(type, "unsigned int")) drm_printf(p, "i915.%s=%u\n", name, *(const unsigned int *)x); + else if (!__builtin_strcmp(type, "unsigned long")) + drm_printf(p, "i915.%s=%lu\n", name, *(const unsigned long *)x); else if (!__builtin_strcmp(type, "char *")) drm_printf(p, "i915.%s=%s\n", name, *(const char **)x); else |