Commit efa6fbd5 authored by Markus Theil's avatar Markus Theil Committed by Andi Shyti
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drm/i915/selftests: use prandom in selftest 



This is part of a prandom cleanup, which removes
next_pseudo_random32 and replaces it with the standard PRNG.

Signed-off-by: default avatarMarkus Theil <theil.markus@gmail.com>
Reviewed-by: default avatarAndi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: default avatarAndi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250211063332.16542-2-theil.markus@gmail.com
parent fc2ef5b6

drivers/gpu/drm/i915/selftests/i915_gem.c

+4 −3
Original line number Diff line number Diff line
@@ -45,13 +45,15 @@ static void trash_stolen(struct drm_i915_private *i915) 
	struct i915_ggtt *ggtt = to_gt(i915)->ggtt;

	const u64 slot = ggtt->error_capture.start;

	const resource_size_t size = resource_size(&i915->dsm.stolen);

	struct rnd_state prng;

	unsigned long page;

	u32 prng = 0x12345678;



	/* XXX: fsck. needs some more thought... */

	if (!i915_ggtt_has_aperture(ggtt))

		return;



	prandom_seed_state(&prng, 0x12345678);



	for (page = 0; page < size; page += PAGE_SIZE) {

		const dma_addr_t dma = i915->dsm.stolen.start + page;

		u32 __iomem *s;
@@ -64,8 +66,7 @@ static void trash_stolen(struct drm_i915_private *i915) 


		s = io_mapping_map_atomic_wc(&ggtt->iomap, slot);

		for (x = 0; x < PAGE_SIZE / sizeof(u32); x++) {

			prng = next_pseudo_random32(prng);

			iowrite32(prng, &s[x]);

			iowrite32(prandom_u32_state(&prng), &s[x]);

		}

		io_mapping_unmap_atomic(s);

	}