From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Simply replace the linear search with the kernel's binary
search implementation. There is only six registers currently
in that table so this may not be that interesting. It adds a
function call so hopefully remains performance neutral for now.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_uncore.c | 26 +++++++++++++++++++++-----
1 file changed, 21 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 8f25cd7ab50f..24e2b167b8b6 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -680,14 +680,30 @@ static void intel_shadow_table_check(void)
}
}
+static int mmio_reg_cmp(const void *key, const void *elt)
+{
+ u32 offset = (u32)(unsigned long)key;
+ i915_reg_t *reg = (i915_reg_t *)elt;
+
+ if (offset < i915_mmio_reg_offset(*reg))
+ return -1;
+ else if (offset > i915_mmio_reg_offset(*reg))
+ return 1;
+ else
+ return 0;
+}
+
static bool is_gen8_shadowed(u32 offset)
{
- int i;
- for (i = 0; i < ARRAY_SIZE(gen8_shadowed_regs); i++)
- if (offset == gen8_shadowed_regs[i].reg)
- return true;
+ i915_reg_t *reg;
- return false;
+ reg = bsearch((void *)(unsigned long)offset,
+ (const void *)gen8_shadowed_regs,
+ ARRAY_SIZE(gen8_shadowed_regs),
+ sizeof(i915_reg_t),
+ mmio_reg_cmp);
+
+ return reg ? true : false;
}
#define __gen8_reg_write_fw_domains(offset) \
--
2.7.4
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