diff options
| author |   Chris Wilson <chris@chris-wilson.co.uk> | 2019-10-02 13:24:30 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-10-02 15:30:44 +0100 |
| commit | dfe324f34c53af095bfe54b322e1a338421a6b0e (patch) | |
| tree | 639ee1e19db8928a78e87ebfe106a09bf8f95169 /drivers/gpu/drm/i915/selftests/i915_random.h | |
| parent | drm/i915: Fix g4x sprite scaling stride check with GTT remapping (diff) | |
| download | linux-dev-dfe324f34c53af095bfe54b322e1a338421a6b0e.tar.xz linux-dev-dfe324f34c53af095bfe54b322e1a338421a6b0e.zip | |
drm/i915/selftests: Extract random_offset() for use with a prng
For selftests, we desire repeatability and so prefer using a prng with
known seed over true randomness. Extract random_offset() as a selftest
utility that can take the prng state.
Suggested-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191002122430.23205-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/selftests/i915_random.h')
| -rw-r--r-- | drivers/gpu/drm/i915/selftests/i915_random.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/selftests/i915_random.h b/drivers/gpu/drm/i915/selftests/i915_random.h index 8e1ff9c105b6..35cc69a3a1b9 100644 --- a/drivers/gpu/drm/i915/selftests/i915_random.h +++ b/drivers/gpu/drm/i915/selftests/i915_random.h @@ -57,4 +57,8 @@ void i915_random_reorder(unsigned int *order, void i915_prandom_shuffle(void *arr, size_t elsz, size_t count, struct rnd_state *state); +u64 igt_random_offset(struct rnd_state *state, + u64 start, u64 end, + u64 len, u64 align); + #endif /* !__I915_SELFTESTS_RANDOM_H__ */ |