From: Namrta <namrta.salonie@xxxxxxxxx>
This can be used to enable WA BB infrastructure for features like
RC6, SSEU and in between context save/restore etc.
The patch which would need WA BB will have to declare the wa_bb obj
utilizing the function here. Update the WA BB with required commands
and update the address of the WA BB at appropriate place.
v2: Move function to the right place to keeps diffs clearer in the
patch that uses this function (Michel)
Change-Id: I9cc49ae7426560215e7b6a6d10ba411caeb9321b
Signed-off-by: Namrta <namrta.salonie@xxxxxxxxx>
Signed-off-by: Arun Siluvery <arun.siluvery@xxxxxxxxxxxxxxx>
Reviewed-by: Michel Thierry <michel.thierry@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_lrc.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 9c851d8..ea37a56 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1107,6 +1107,38 @@ static int intel_logical_ring_workarounds_emit(struct intel_engine_cs *ring,
return 0;
}
+static struct intel_ringbuffer *
+create_wa_bb(struct intel_engine_cs *ring, uint32_t bb_size)
+{
+ struct drm_device *dev = ring->dev;
+ struct intel_ringbuffer *ringbuf;
+ int ret;
+
+ ringbuf = kzalloc(sizeof(*ringbuf), GFP_KERNEL);
+ if (!ringbuf)
+ return NULL;
+
+ ringbuf->ring = ring;
+
+ ringbuf->size = roundup(bb_size, PAGE_SIZE);
+ ringbuf->effective_size = ringbuf->size;
+ ringbuf->head = 0;
+ ringbuf->tail = 0;
+ ringbuf->space = ringbuf->size;
+ ringbuf->last_retired_head = -1;
+
+ ret = intel_alloc_ringbuffer_obj(dev, ringbuf);
+ if (ret) {
+ DRM_DEBUG_DRIVER(
+ "Failed to allocate ringbuf obj for wa_bb%s: %d\n",
+ ring->name, ret);
+ kfree(ringbuf);
+ return NULL;
+ }
+
+ return ringbuf;
+}
+
static int gen8_init_common_ring(struct intel_engine_cs *ring)
{
struct drm_device *dev = ring->dev;
--
2.3.0
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