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-rw-r--r--drivers/gpu/drm/i915/intel_lrc.c39
-rw-r--r--drivers/gpu/drm/i915/intel_lrc.h2
2 files changed, 34 insertions, 7 deletions
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 72e0edd..7412cae 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -484,18 +484,18 @@ void intel_lrc_irq_handler(struct intel_engine_cs *ring)
status_pointer = I915_READ(RING_CONTEXT_STATUS_PTR(ring));
read_pointer = ring->next_context_status_buffer;
- write_pointer = status_pointer & 0x07;
+ write_pointer = status_pointer & GEN8_CSB_PTR_MASK;
if (read_pointer > write_pointer)
- write_pointer += 6;
+ write_pointer += GEN8_CSB_ENTRIES;
spin_lock(&ring->execlist_lock);
while (read_pointer < write_pointer) {
read_pointer++;
status = I915_READ(RING_CONTEXT_STATUS_BUF(ring) +
- (read_pointer % 6) * 8);
+ (read_pointer % GEN8_CSB_ENTRIES) * 8);
status_id = I915_READ(RING_CONTEXT_STATUS_BUF(ring) +
- (read_pointer % 6) * 8 + 4);
+ (read_pointer % GEN8_CSB_ENTRIES) * 8 + 4);
if (status & GEN8_CTX_STATUS_IDLE_ACTIVE)
continue;
@@ -521,10 +521,12 @@ void intel_lrc_irq_handler(struct intel_engine_cs *ring)
spin_unlock(&ring->execlist_lock);
WARN(submit_contexts > 2, "More than two context complete events?\n");
- ring->next_context_status_buffer = write_pointer % 6;
+ ring->next_context_status_buffer = write_pointer % GEN8_CSB_ENTRIES;
I915_WRITE(RING_CONTEXT_STATUS_PTR(ring),
- _MASKED_FIELD(0x07 << 8, ((u32)ring->next_context_status_buffer & 0x07) << 8));
+ _MASKED_FIELD(GEN8_CSB_PTR_MASK << 8,
+ ((u32)ring->next_context_status_buffer &
+ GEN8_CSB_PTR_MASK) << 8));
}
static int execlists_context_queue(struct drm_i915_gem_request *request)
@@ -1422,6 +1424,7 @@ static int gen8_init_common_ring(struct intel_engine_cs *ring)
{
struct drm_device *dev = ring->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
+ u8 next_context_status_buffer_hw;
I915_WRITE_IMR(ring, ~(ring->irq_enable_mask | ring->irq_keep_mask));
I915_WRITE(RING_HWSTAM(ring->mmio_base), 0xffffffff);
@@ -1436,7 +1439,29 @@ static int gen8_init_common_ring(struct intel_engine_cs *ring)
_MASKED_BIT_DISABLE(GFX_REPLAY_MODE) |
_MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE));
POSTING_READ(RING_MODE_GEN7(ring));
- ring->next_context_status_buffer = 0;
+
+ /*
+ * Instead of resetting the Context Status Buffer (CSB) read pointer to
+ * zero, we need to read the write pointer from hardware and use its
+ * value because "this register is power context save restored".
+ * Effectively, these states have been observed:
+ *
+ * | Suspend-to-idle (freeze) | Suspend-to-RAM (mem) |
+ * BDW | CSB regs not reset | CSB regs reset |
+ * CHT | CSB regs not reset | CSB regs not reset |
+ */
+ next_context_status_buffer_hw = (I915_READ(RING_CONTEXT_STATUS_PTR(ring))
+ & GEN8_CSB_PTR_MASK);
+
+ /*
+ * When the CSB registers are reset (also after power-up / gpu reset),
+ * CSB write pointer is set to all 1's, which is not valid, use '5' in
+ * this special case, so the first element read is CSB[0].
+ */
+ if (next_context_status_buffer_hw == GEN8_CSB_PTR_MASK)
+ next_context_status_buffer_hw = (GEN8_CSB_ENTRIES - 1);
+
+ ring->next_context_status_buffer = next_context_status_buffer_hw;
DRM_DEBUG_DRIVER("Execlists enabled for %s\n", ring->name);
memset(&ring->hangcheck, 0, sizeof(ring->hangcheck));
diff --git a/drivers/gpu/drm/i915/intel_lrc.h b/drivers/gpu/drm/i915/intel_lrc.h
index 64f89f99..3c63bb3 100644
--- a/drivers/gpu/drm/i915/intel_lrc.h
+++ b/drivers/gpu/drm/i915/intel_lrc.h
@@ -25,6 +25,8 @@
#define _INTEL_LRC_H_
#define GEN8_LR_CONTEXT_ALIGN 4096
+#define GEN8_CSB_ENTRIES 6
+#define GEN8_CSB_PTR_MASK 0x07
/* Execlists regs */
#define RING_ELSP(ring) ((ring)->mmio_base+0x230)
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