drm/radeon: add IB and fence dispatch functions for CIK gfx (v7)
For gfx ring only. Compute is still todo.
v2: add documentation
v3: update to latest reset changes, integrate emit update patch.
v4: fix count on wait_reg_mem for HDP flush
v5: use old hdp flush method for fence
v6: set valid bit for IB
v7: cleanup for release
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index 5712526..0b9c3c9 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -1493,6 +1493,140 @@
}
/*
+ * GPU scratch registers helpers function.
+ */
+/**
+ * cik_scratch_init - setup driver info for CP scratch regs
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Set up the number and offset of the CP scratch registers.
+ * NOTE: use of CP scratch registers is a legacy inferface and
+ * is not used by default on newer asics (r6xx+). On newer asics,
+ * memory buffers are used for fences rather than scratch regs.
+ */
+static void cik_scratch_init(struct radeon_device *rdev)
+{
+ int i;
+
+ rdev->scratch.num_reg = 7;
+ rdev->scratch.reg_base = SCRATCH_REG0;
+ for (i = 0; i < rdev->scratch.num_reg; i++) {
+ rdev->scratch.free[i] = true;
+ rdev->scratch.reg[i] = rdev->scratch.reg_base + (i * 4);
+ }
+}
+
+/**
+ * cik_fence_ring_emit - emit a fence on the gfx ring
+ *
+ * @rdev: radeon_device pointer
+ * @fence: radeon fence object
+ *
+ * Emits a fence sequnce number on the gfx ring and flushes
+ * GPU caches.
+ */
+void cik_fence_ring_emit(struct radeon_device *rdev,
+ struct radeon_fence *fence)
+{
+ struct radeon_ring *ring = &rdev->ring[fence->ring];
+ u64 addr = rdev->fence_drv[fence->ring].gpu_addr;
+
+ /* EVENT_WRITE_EOP - flush caches, send int */
+ radeon_ring_write(ring, PACKET3(PACKET3_EVENT_WRITE_EOP, 4));
+ radeon_ring_write(ring, (EOP_TCL1_ACTION_EN |
+ EOP_TC_ACTION_EN |
+ EVENT_TYPE(CACHE_FLUSH_AND_INV_TS_EVENT) |
+ EVENT_INDEX(5)));
+ radeon_ring_write(ring, addr & 0xfffffffc);
+ radeon_ring_write(ring, (upper_32_bits(addr) & 0xffff) | DATA_SEL(1) | INT_SEL(2));
+ radeon_ring_write(ring, fence->seq);
+ radeon_ring_write(ring, 0);
+ /* HDP flush */
+ /* We should be using the new WAIT_REG_MEM special op packet here
+ * but it causes the CP to hang
+ */
+ radeon_ring_write(ring, PACKET3(PACKET3_WRITE_DATA, 3));
+ radeon_ring_write(ring, (WRITE_DATA_ENGINE_SEL(0) |
+ WRITE_DATA_DST_SEL(0)));
+ radeon_ring_write(ring, HDP_MEM_COHERENCY_FLUSH_CNTL >> 2);
+ radeon_ring_write(ring, 0);
+ radeon_ring_write(ring, 0);
+}
+
+void cik_semaphore_ring_emit(struct radeon_device *rdev,
+ struct radeon_ring *ring,
+ struct radeon_semaphore *semaphore,
+ bool emit_wait)
+{
+ uint64_t addr = semaphore->gpu_addr;
+ unsigned sel = emit_wait ? PACKET3_SEM_SEL_WAIT : PACKET3_SEM_SEL_SIGNAL;
+
+ radeon_ring_write(ring, PACKET3(PACKET3_MEM_SEMAPHORE, 1));
+ radeon_ring_write(ring, addr & 0xffffffff);
+ radeon_ring_write(ring, (upper_32_bits(addr) & 0xffff) | sel);
+}
+
+/*
+ * IB stuff
+ */
+/**
+ * cik_ring_ib_execute - emit an IB (Indirect Buffer) on the gfx ring
+ *
+ * @rdev: radeon_device pointer
+ * @ib: radeon indirect buffer object
+ *
+ * Emits an DE (drawing engine) or CE (constant engine) IB
+ * on the gfx ring. IBs are usually generated by userspace
+ * acceleration drivers and submitted to the kernel for
+ * sheduling on the ring. This function schedules the IB
+ * on the gfx ring for execution by the GPU.
+ */
+void cik_ring_ib_execute(struct radeon_device *rdev, struct radeon_ib *ib)
+{
+ struct radeon_ring *ring = &rdev->ring[ib->ring];
+ u32 header, control = INDIRECT_BUFFER_VALID;
+
+ if (ib->is_const_ib) {
+ /* set switch buffer packet before const IB */
+ radeon_ring_write(ring, PACKET3(PACKET3_SWITCH_BUFFER, 0));
+ radeon_ring_write(ring, 0);
+
+ header = PACKET3(PACKET3_INDIRECT_BUFFER_CONST, 2);
+ } else {
+ u32 next_rptr;
+ if (ring->rptr_save_reg) {
+ next_rptr = ring->wptr + 3 + 4;
+ radeon_ring_write(ring, PACKET3(PACKET3_SET_UCONFIG_REG, 1));
+ radeon_ring_write(ring, ((ring->rptr_save_reg -
+ PACKET3_SET_UCONFIG_REG_START) >> 2));
+ radeon_ring_write(ring, next_rptr);
+ } else if (rdev->wb.enabled) {
+ next_rptr = ring->wptr + 5 + 4;
+ radeon_ring_write(ring, PACKET3(PACKET3_WRITE_DATA, 3));
+ radeon_ring_write(ring, WRITE_DATA_DST_SEL(1));
+ radeon_ring_write(ring, ring->next_rptr_gpu_addr & 0xfffffffc);
+ radeon_ring_write(ring, upper_32_bits(ring->next_rptr_gpu_addr) & 0xffffffff);
+ radeon_ring_write(ring, next_rptr);
+ }
+
+ header = PACKET3(PACKET3_INDIRECT_BUFFER, 2);
+ }
+
+ control |= ib->length_dw |
+ (ib->vm ? (ib->vm->id << 24) : 0);
+
+ radeon_ring_write(ring, header);
+ radeon_ring_write(ring,
+#ifdef __BIG_ENDIAN
+ (2 << 0) |
+#endif
+ (ib->gpu_addr & 0xFFFFFFFC));
+ radeon_ring_write(ring, upper_32_bits(ib->gpu_addr) & 0xFFFF);
+ radeon_ring_write(ring, control);
+}
+
+/*
* CP.
* On CIK, gfx and compute now have independant command processors.
*