diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2019-10-02 15:24:30 +0300 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-10-02 17:30:44 +0300 |
| commit | dfe324f34c53af095bfe54b322e1a338421a6b0e (patch) | |
| tree | 639ee1e19db8928a78e87ebfe106a09bf8f95169 /drivers/gpu/drm | |
| parent | 006e570128f413759b9df64b51bae79903679c9b (diff) | |
| download | linux-dfe324f34c53af095bfe54b322e1a338421a6b0e.tar.xz | |
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')
| -rw-r--r-- | drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 14 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/selftests/i915_random.c | 20 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/selftests/i915_random.h | 4 |
3 files changed, 33 insertions, 5 deletions
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c index 0d40e0b42923..f901bbb9586e 100644 --- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c @@ -1299,6 +1299,7 @@ static int igt_gtt_reserve(void *arg) { struct i915_ggtt *ggtt = arg; struct drm_i915_gem_object *obj, *on; + I915_RND_STATE(prng); LIST_HEAD(objects); u64 total; int err = -ENODEV; @@ -1425,9 +1426,10 @@ static int igt_gtt_reserve(void *arg) goto out; } - offset = random_offset(0, ggtt->vm.total, - 2*I915_GTT_PAGE_SIZE, - I915_GTT_MIN_ALIGNMENT); + offset = igt_random_offset(&prng, + 0, ggtt->vm.total, + 2 * I915_GTT_PAGE_SIZE, + I915_GTT_MIN_ALIGNMENT); err = i915_gem_gtt_reserve(&ggtt->vm, &vma->node, obj->base.size, @@ -1772,6 +1774,7 @@ static int igt_cs_tlb(void *arg) struct intel_context *ce; struct drm_file *file; struct i915_vma *vma; + I915_RND_STATE(prng); unsigned int i; u32 *result; u32 *batch; @@ -1885,8 +1888,9 @@ static int igt_cs_tlb(void *arg) struct i915_request *rq; u64 offset; - offset = random_offset(0, vm->total - PAGE_SIZE, - chunk_size, PAGE_SIZE); + offset = igt_random_offset(&prng, + 0, vm->total - PAGE_SIZE, + chunk_size, PAGE_SIZE); err = vm->allocate_va_range(vm, offset, chunk_size); if (err) diff --git a/drivers/gpu/drm/i915/selftests/i915_random.c b/drivers/gpu/drm/i915/selftests/i915_random.c index 716a3f19f030..abdfadcf626b 100644 --- a/drivers/gpu/drm/i915/selftests/i915_random.c +++ b/drivers/gpu/drm/i915/selftests/i915_random.c @@ -29,6 +29,7 @@ #include <linux/types.h> #include "i915_random.h" +#include "i915_utils.h" u64 i915_prandom_u64_state(struct rnd_state *rnd) { @@ -87,3 +88,22 @@ unsigned int *i915_random_order(unsigned int count, struct rnd_state *state) i915_random_reorder(order, count, state); return order; } + +u64 igt_random_offset(struct rnd_state *state, + u64 start, u64 end, + u64 len, u64 align) +{ + u64 range, addr; + + BUG_ON(range_overflows(start, len, end)); + BUG_ON(round_up(start, align) > round_down(end - len, align)); + + range = round_down(end - len, align) - round_up(start, align); + if (range) { + addr = i915_prandom_u64_state(state); + div64_u64_rem(addr, range, &addr); + start += addr; + } + + return round_up(start, align); +} 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__ */ |