From 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 13 May 2024 10:30:14 +0000
Subject: [PATCH] modify sin led gpio
---
kernel/drivers/gpu/drm/i915/selftests/i915_random.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++-------
1 files changed, 46 insertions(+), 7 deletions(-)
diff --git a/kernel/drivers/gpu/drm/i915/selftests/i915_random.c b/kernel/drivers/gpu/drm/i915/selftests/i915_random.c
index 1f415ce..abdfadc 100644
--- a/kernel/drivers/gpu/drm/i915/selftests/i915_random.c
+++ b/kernel/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)
{
@@ -41,16 +42,35 @@
return x;
}
+void i915_prandom_shuffle(void *arr, size_t elsz, size_t count,
+ struct rnd_state *state)
+{
+ char stack[128];
+
+ if (WARN_ON(elsz > sizeof(stack) || count > U32_MAX))
+ return;
+
+ if (!elsz || !count)
+ return;
+
+ /* Fisher-Yates shuffle courtesy of Knuth */
+ while (--count) {
+ size_t swp;
+
+ swp = i915_prandom_u32_max_state(count + 1, state);
+ if (swp == count)
+ continue;
+
+ memcpy(stack, arr + count * elsz, elsz);
+ memcpy(arr + count * elsz, arr + swp * elsz, elsz);
+ memcpy(arr + swp * elsz, stack, elsz);
+ }
+}
+
void i915_random_reorder(unsigned int *order, unsigned int count,
struct rnd_state *state)
{
- unsigned int i, j;
-
- for (i = 0; i < count; i++) {
- BUILD_BUG_ON(sizeof(unsigned int) > sizeof(u32));
- j = i915_prandom_u32_max_state(count, state);
- swap(order[i], order[j]);
- }
+ i915_prandom_shuffle(order, sizeof(*order), count, state);
}
unsigned int *i915_random_order(unsigned int count, struct rnd_state *state)
@@ -68,3 +88,22 @@
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);
+}
--
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