drm/radeon: add dma engine support for vm pt updates on ni (v5)

Async DMA has a special packet for contiguous pt updates
which saves overhead.

v2: leave the CP method enabled for now as doing the updates
in the DMA rings is not working properly yet.

v3: update for 2 level pts

v4: rebase

v5: drop pte/pde packet.  doesn't seem to work on NI.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 48 insertions, 21 deletions

diff --git a/drivers/gpu/drm/radeon/ni.c b/drivers/gpu/drm/radeon/ni.c
index b81aca44fd41..39e8be1d1e89 100644
--- a/drivers/gpu/drm/radeon/ni.c
+++ b/drivers/gpu/drm/radeon/ni.c
@@ -1795,30 +1795,57 @@ void cayman_vm_set_page(struct radeon_device *rdev, uint64_t pe,
 {
         struct radeon_ring *ring = &rdev->ring[rdev->asic->vm.pt_ring_index];
         uint32_t r600_flags = cayman_vm_page_flags(rdev, flags);
-
-        while (count) {
-                unsigned ndw = 1 + count * 2;
-                if (ndw > 0x3FFF)
-                        ndw = 0x3FFF;
-
-                radeon_ring_write(ring, PACKET3(PACKET3_ME_WRITE, ndw));
-                radeon_ring_write(ring, pe);
-                radeon_ring_write(ring, upper_32_bits(pe) & 0xff);
-                for (; ndw > 1; ndw -= 2, --count, pe += 8) {
-                        uint64_t value = 0;
-                        if (flags & RADEON_VM_PAGE_SYSTEM) {
-                                value = radeon_vm_map_gart(rdev, addr);
-                                value &= 0xFFFFFFFFFFFFF000ULL;
+        uint64_t value;
+        unsigned ndw;
+
+        if (rdev->asic->vm.pt_ring_index == RADEON_RING_TYPE_GFX_INDEX) {
+                while (count) {
+                        ndw = 1 + count * 2;
+                        if (ndw > 0x3FFF)
+                                ndw = 0x3FFF;
+
+                        radeon_ring_write(ring, PACKET3(PACKET3_ME_WRITE, ndw));
+                        radeon_ring_write(ring, pe);
+                        radeon_ring_write(ring, upper_32_bits(pe) & 0xff);
+                        for (; ndw > 1; ndw -= 2, --count, pe += 8) {
+                                if (flags & RADEON_VM_PAGE_SYSTEM) {
+                                        value = radeon_vm_map_gart(rdev, addr);
+                                        value &= 0xFFFFFFFFFFFFF000ULL;
+                                } else if (flags & RADEON_VM_PAGE_VALID) {
+                                        value = addr;
+                                } else {
+                                        value = 0;
+                                }
                                 addr += incr;
-
-                        } else if (flags & RADEON_VM_PAGE_VALID) {
-                                value = addr;
+                                value |= r600_flags;
+                                radeon_ring_write(ring, value);
+                                radeon_ring_write(ring, upper_32_bits(value));
+                        }
+                }
+        } else {
+                while (count) {
+                        ndw = count * 2;
+                        if (ndw > 0xFFFFE)
+                                ndw = 0xFFFFE;
+
+                        /* for non-physically contiguous pages (system) */
+                        radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_WRITE, 0, 0, ndw));
+                        radeon_ring_write(ring, pe);
+                        radeon_ring_write(ring, upper_32_bits(pe) & 0xff);
+                        for (; ndw > 0; ndw -= 2, --count, pe += 8) {
+                                if (flags & RADEON_VM_PAGE_SYSTEM) {
+                                        value = radeon_vm_map_gart(rdev, addr);
+                                        value &= 0xFFFFFFFFFFFFF000ULL;
+                                } else if (flags & RADEON_VM_PAGE_VALID) {
+                                        value = addr;
+                                } else {
+                                        value = 0;
+                                }
                                 addr += incr;
+                                value |= r600_flags;
+                                radeon_ring_write(ring, value);
+                                radeon_ring_write(ring, upper_32_bits(value));
                         }
-
-                        value |= r600_flags;
-                        radeon_ring_write(ring, value);
-                        radeon_ring_write(ring, upper_32_bits(value));
                 }
         }
 }