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drm/i915: Prefer memset64() when filling the iomap

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As the ringbuffer may exist inside stolen memory, our access to it may
be via the GTT iomap. This implies we may only have WC access for which
the conventional memset() substitution of rep stos performs very badly,
so switch to the rep mov[dq] variants when available.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180319123528.28249-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-03-19 12:35:28 +00:00
parent feb06c151f
commit 46b863325c
1 changed files with 4 additions and 3 deletions
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7
drivers/gpu/drm/i915/intel_ringbuffer.c
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@ -1693,17 +1693,18 @@ u32 *intel_ring_begin(struct i915_request *rq, unsigned int num_dwords)
need_wrap &= ~1;
GEM_BUG_ON(need_wrap > ring->space);
GEM_BUG_ON(ring->emit + need_wrap > ring->size);
GEM_BUG_ON(!IS_ALIGNED(need_wrap, sizeof(u64)));
/* Fill the tail with MI_NOOP */
memset(ring->vaddr + ring->emit, 0, need_wrap);
ring->emit = 0;
memset64(ring->vaddr + ring->emit, 0, need_wrap / sizeof(u64));
ring->space -= need_wrap;
ring->emit = 0;
}
GEM_BUG_ON(ring->emit > ring->size - bytes);
GEM_BUG_ON(ring->space < bytes);
cs = ring->vaddr + ring->emit;
GEM_DEBUG_EXEC(memset(cs, POISON_INUSE, bytes));
GEM_DEBUG_EXEC(memset32(cs, POISON_INUSE, bytes / sizeof(*cs)));
ring->emit += bytes;
ring->space -= bytes;