drm/radeon/kms: Add initial support for async DMA on evergreen

Pretty similar to 6xx/7xx except the count field increased in the
packet header and the max IB size increased.

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

4 files changed, 248 insertions, 9 deletions

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 78de2e4097b5..68206df3d5d2 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -2034,6 +2034,7 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
         WREG32(GB_ADDR_CONFIG, gb_addr_config);
         WREG32(DMIF_ADDR_CONFIG, gb_addr_config);
         WREG32(HDP_ADDR_CONFIG, gb_addr_config);
+        WREG32(DMA_TILING_CONFIG, gb_addr_config);
 
         tmp = gb_addr_config & NUM_PIPES_MASK;
         tmp = r6xx_remap_render_backend(rdev, tmp, rdev->config.evergreen.max_backends,
@@ -2405,6 +2406,8 @@ void evergreen_disable_interrupt_state(struct radeon_device *rdev)
                 cayman_cp_int_cntl_setup(rdev, 2, 0);
         } else
                 WREG32(CP_INT_CNTL, CNTX_BUSY_INT_ENABLE | CNTX_EMPTY_INT_ENABLE);
+        tmp = RREG32(DMA_CNTL) & ~TRAP_ENABLE;
+        WREG32(DMA_CNTL, tmp);
         WREG32(GRBM_INT_CNTL, 0);
         WREG32(INT_MASK + EVERGREEN_CRTC0_REGISTER_OFFSET, 0);
         WREG32(INT_MASK + EVERGREEN_CRTC1_REGISTER_OFFSET, 0);
@@ -2457,6 +2460,7 @@ int evergreen_irq_set(struct radeon_device *rdev)
         u32 grbm_int_cntl = 0;
         u32 grph1 = 0, grph2 = 0, grph3 = 0, grph4 = 0, grph5 = 0, grph6 = 0;
         u32 afmt1 = 0, afmt2 = 0, afmt3 = 0, afmt4 = 0, afmt5 = 0, afmt6 = 0;
+        u32 dma_cntl;
 
         if (!rdev->irq.installed) {
                 WARN(1, "Can't enable IRQ/MSI because no handler is installed\n");
@@ -2484,6 +2488,8 @@ int evergreen_irq_set(struct radeon_device *rdev)
         afmt5 = RREG32(AFMT_AUDIO_PACKET_CONTROL + EVERGREEN_CRTC4_REGISTER_OFFSET) & ~AFMT_AZ_FORMAT_WTRIG_MASK;
         afmt6 = RREG32(AFMT_AUDIO_PACKET_CONTROL + EVERGREEN_CRTC5_REGISTER_OFFSET) & ~AFMT_AZ_FORMAT_WTRIG_MASK;
 
+        dma_cntl = RREG32(DMA_CNTL) & ~TRAP_ENABLE;
+
         if (rdev->family >= CHIP_CAYMAN) {
                 /* enable CP interrupts on all rings */
                 if (atomic_read(&rdev->irq.ring_int[RADEON_RING_TYPE_GFX_INDEX])) {
@@ -2506,6 +2512,11 @@ int evergreen_irq_set(struct radeon_device *rdev)
                 }
         }
 
+        if (atomic_read(&rdev->irq.ring_int[R600_RING_TYPE_DMA_INDEX])) {
+                DRM_DEBUG("r600_irq_set: sw int dma\n");
+                dma_cntl |= TRAP_ENABLE;
+        }
+
         if (rdev->irq.crtc_vblank_int[0] ||
             atomic_read(&rdev->irq.pflip[0])) {
                 DRM_DEBUG("evergreen_irq_set: vblank 0\n");
@@ -2591,6 +2602,9 @@ int evergreen_irq_set(struct radeon_device *rdev)
                 cayman_cp_int_cntl_setup(rdev, 2, cp_int_cntl2);
         } else
                 WREG32(CP_INT_CNTL, cp_int_cntl);
+
+        WREG32(DMA_CNTL, dma_cntl);
+
         WREG32(GRBM_INT_CNTL, grbm_int_cntl);
 
         WREG32(INT_MASK + EVERGREEN_CRTC0_REGISTER_OFFSET, crtc1);
@@ -3126,6 +3140,10 @@ restart_ih:
                         } else
                                 radeon_fence_process(rdev, RADEON_RING_TYPE_GFX_INDEX);
                         break;
+                case 224: /* DMA trap event */
+                        DRM_DEBUG("IH: DMA trap\n");
+                        radeon_fence_process(rdev, R600_RING_TYPE_DMA_INDEX);
+                        break;
                 case 233: /* GUI IDLE */
                         DRM_DEBUG("IH: GUI idle\n");
                         break;
@@ -3154,6 +3172,143 @@ restart_ih:
         return IRQ_HANDLED;
 }
 
+/**
+ * evergreen_dma_fence_ring_emit - emit a fence on the DMA ring
+ *
+ * @rdev: radeon_device pointer
+ * @fence: radeon fence object
+ *
+ * Add a DMA fence packet to the ring to write
+ * the fence seq number and DMA trap packet to generate
+ * an interrupt if needed (evergreen-SI).
+ */
+void evergreen_dma_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;
+        /* write the fence */
+        radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_FENCE, 0, 0, 0));
+        radeon_ring_write(ring, addr & 0xfffffffc);
+        radeon_ring_write(ring, (upper_32_bits(addr) & 0xff));
+        radeon_ring_write(ring, fence->seq);
+        /* generate an interrupt */
+        radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_TRAP, 0, 0, 0));
+        /* flush HDP */
+        radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_SRBM_WRITE, 0, 0, 0));
+        radeon_ring_write(ring, (0xf << 16) | HDP_MEM_COHERENCY_FLUSH_CNTL);
+        radeon_ring_write(ring, 1);
+}
+
+/**
+ * evergreen_dma_ring_ib_execute - schedule an IB on the DMA engine
+ *
+ * @rdev: radeon_device pointer
+ * @ib: IB object to schedule
+ *
+ * Schedule an IB in the DMA ring (evergreen).
+ */
+void evergreen_dma_ring_ib_execute(struct radeon_device *rdev,
+                                   struct radeon_ib *ib)
+{
+        struct radeon_ring *ring = &rdev->ring[ib->ring];
+
+        if (rdev->wb.enabled) {
+                u32 next_rptr = ring->wptr + 4;
+                while ((next_rptr & 7) != 5)
+                        next_rptr++;
+                next_rptr += 3;
+                radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_WRITE, 0, 0, 1));
+                radeon_ring_write(ring, ring->next_rptr_gpu_addr & 0xfffffffc);
+                radeon_ring_write(ring, upper_32_bits(ring->next_rptr_gpu_addr) & 0xff);
+                radeon_ring_write(ring, next_rptr);
+        }
+
+        /* The indirect buffer packet must end on an 8 DW boundary in the DMA ring.
+         * Pad as necessary with NOPs.
+         */
+        while ((ring->wptr & 7) != 5)
+                radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_NOP, 0, 0, 0));
+        radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_INDIRECT_BUFFER, 0, 0, 0));
+        radeon_ring_write(ring, (ib->gpu_addr & 0xFFFFFFE0));
+        radeon_ring_write(ring, (ib->length_dw << 12) | (upper_32_bits(ib->gpu_addr) & 0xFF));
+
+}
+
+/**
+ * evergreen_copy_dma - copy pages using the DMA engine
+ *
+ * @rdev: radeon_device pointer
+ * @src_offset: src GPU address
+ * @dst_offset: dst GPU address
+ * @num_gpu_pages: number of GPU pages to xfer
+ * @fence: radeon fence object
+ *
+ * Copy GPU paging using the DMA engine (evergreen-cayman).
+ * Used by the radeon ttm implementation to move pages if
+ * registered as the asic copy callback.
+ */
+int evergreen_copy_dma(struct radeon_device *rdev,
+                       uint64_t src_offset, uint64_t dst_offset,
+                       unsigned num_gpu_pages,
+                       struct radeon_fence **fence)
+{
+        struct radeon_semaphore *sem = NULL;
+        int ring_index = rdev->asic->copy.dma_ring_index;
+        struct radeon_ring *ring = &rdev->ring[ring_index];
+        u32 size_in_dw, cur_size_in_dw;
+        int i, num_loops;
+        int r = 0;
+
+        r = radeon_semaphore_create(rdev, &sem);
+        if (r) {
+                DRM_ERROR("radeon: moving bo (%d).\n", r);
+                return r;
+        }
+
+        size_in_dw = (num_gpu_pages << RADEON_GPU_PAGE_SHIFT) / 4;
+        num_loops = DIV_ROUND_UP(size_in_dw, 0xfffff);
+        r = radeon_ring_lock(rdev, ring, num_loops * 5 + 11);
+        if (r) {
+                DRM_ERROR("radeon: moving bo (%d).\n", r);
+                radeon_semaphore_free(rdev, &sem, NULL);
+                return r;
+        }
+
+        if (radeon_fence_need_sync(*fence, ring->idx)) {
+                radeon_semaphore_sync_rings(rdev, sem, (*fence)->ring,
+                                            ring->idx);
+                radeon_fence_note_sync(*fence, ring->idx);
+        } else {
+                radeon_semaphore_free(rdev, &sem, NULL);
+        }
+
+        for (i = 0; i < num_loops; i++) {
+                cur_size_in_dw = size_in_dw;
+                if (cur_size_in_dw > 0xFFFFF)
+                        cur_size_in_dw = 0xFFFFF;
+                size_in_dw -= cur_size_in_dw;
+                radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_COPY, 0, 0, cur_size_in_dw));
+                radeon_ring_write(ring, dst_offset & 0xfffffffc);
+                radeon_ring_write(ring, src_offset & 0xfffffffc);
+                radeon_ring_write(ring, upper_32_bits(dst_offset) & 0xff);
+                radeon_ring_write(ring, upper_32_bits(src_offset) & 0xff);
+                src_offset += cur_size_in_dw * 4;
+                dst_offset += cur_size_in_dw * 4;
+        }
+
+        r = radeon_fence_emit(rdev, fence, ring->idx);
+        if (r) {
+                radeon_ring_unlock_undo(rdev, ring);
+                return r;
+        }
+
+        radeon_ring_unlock_commit(rdev, ring);
+        radeon_semaphore_free(rdev, &sem, *fence);
+
+        return r;
+}
+
 static int evergreen_startup(struct radeon_device *rdev)
 {
         struct radeon_ring *ring = &rdev->ring[RADEON_RING_TYPE_GFX_INDEX];
@@ -3217,6 +3372,12 @@ static int evergreen_startup(struct radeon_device *rdev)
                 return r;
         }
 
+        r = radeon_fence_driver_start_ring(rdev, R600_RING_TYPE_DMA_INDEX);
+        if (r) {
+                dev_err(rdev->dev, "failed initializing DMA fences (%d).\n", r);
+                return r;
+        }
+
         /* Enable IRQ */
         r = r600_irq_init(rdev);
         if (r) {
@@ -3231,12 +3392,23 @@ static int evergreen_startup(struct radeon_device *rdev)
                              0, 0xfffff, RADEON_CP_PACKET2);
         if (r)
                 return r;
+
+        ring = &rdev->ring[R600_RING_TYPE_DMA_INDEX];
+        r = radeon_ring_init(rdev, ring, ring->ring_size, R600_WB_DMA_RPTR_OFFSET,
+                             DMA_RB_RPTR, DMA_RB_WPTR,
+                             2, 0x3fffc, DMA_PACKET(DMA_PACKET_NOP, 0, 0, 0));
+        if (r)
+                return r;
+
         r = evergreen_cp_load_microcode(rdev);
         if (r)
                 return r;
         r = evergreen_cp_resume(rdev);
         if (r)
                 return r;
+        r = r600_dma_resume(rdev);
+        if (r)
+                return r;
 
         r = radeon_ib_pool_init(rdev);
         if (r) {
@@ -3283,11 +3455,9 @@ int evergreen_resume(struct radeon_device *rdev)
 
 int evergreen_suspend(struct radeon_device *rdev)
 {
-        struct radeon_ring *ring = &rdev->ring[RADEON_RING_TYPE_GFX_INDEX];
-
         r600_audio_fini(rdev);
         r700_cp_stop(rdev);
-        ring->ready = false;
+        r600_dma_stop(rdev);
         evergreen_irq_suspend(rdev);
         radeon_wb_disable(rdev);
         evergreen_pcie_gart_disable(rdev);
@@ -3364,6 +3534,9 @@ int evergreen_init(struct radeon_device *rdev)
         rdev->ring[RADEON_RING_TYPE_GFX_INDEX].ring_obj = NULL;
         r600_ring_init(rdev, &rdev->ring[RADEON_RING_TYPE_GFX_INDEX], 1024 * 1024);
 
+        rdev->ring[R600_RING_TYPE_DMA_INDEX].ring_obj = NULL;
+        r600_ring_init(rdev, &rdev->ring[R600_RING_TYPE_DMA_INDEX], 64 * 1024);
+
         rdev->ih.ring_obj = NULL;
         r600_ih_ring_init(rdev, 64 * 1024);
 
@@ -3376,6 +3549,7 @@ int evergreen_init(struct radeon_device *rdev)
         if (r) {
                 dev_err(rdev->dev, "disabling GPU acceleration\n");
                 r700_cp_fini(rdev);
+                r600_dma_fini(rdev);
                 r600_irq_fini(rdev);
                 radeon_wb_fini(rdev);
                 radeon_ib_pool_fini(rdev);
@@ -3403,6 +3577,7 @@ void evergreen_fini(struct radeon_device *rdev)
         r600_audio_fini(rdev);
         r600_blit_fini(rdev);
         r700_cp_fini(rdev);
+        r600_dma_fini(rdev);
         r600_irq_fini(rdev);
         radeon_wb_fini(rdev);
         radeon_ib_pool_fini(rdev);
diff --git a/drivers/gpu/drm/radeon/evergreend.h b/drivers/gpu/drm/radeon/evergreend.h
index cae7ab4219ef..92d1f4521caf 100644
--- a/drivers/gpu/drm/radeon/evergreend.h
+++ b/drivers/gpu/drm/radeon/evergreend.h
@@ -905,6 +905,35 @@
 #       define DC_HPDx_RX_INT_TIMER(x)                    ((x) << 16)
 #       define DC_HPDx_EN                                 (1 << 28)
 
+/* ASYNC DMA */
+#define DMA_RB_RPTR                                       0xd008
+#define DMA_RB_WPTR                                       0xd00c
+
+#define DMA_CNTL                                          0xd02c
+#       define TRAP_ENABLE                                (1 << 0)
+#       define SEM_INCOMPLETE_INT_ENABLE                  (1 << 1)
+#       define SEM_WAIT_INT_ENABLE                        (1 << 2)
+#       define DATA_SWAP_ENABLE                           (1 << 3)
+#       define FENCE_SWAP_ENABLE                          (1 << 4)
+#       define CTXEMPTY_INT_ENABLE                        (1 << 28)
+#define DMA_TILING_CONFIG                                 0xD0B8
+
+/* async DMA packets */
+#define DMA_PACKET(cmd, t, s, n)        ((((cmd) & 0xF) << 28) |        \
+                                         (((t) & 0x1) << 23) |          \
+                                         (((s) & 0x1) << 22) |          \
+                                         (((n) & 0xFFFFF) << 0))
+/* async DMA Packet types */
+#define DMA_PACKET_WRITE                                  0x2
+#define DMA_PACKET_COPY                                   0x3
+#define DMA_PACKET_INDIRECT_BUFFER                        0x4
+#define DMA_PACKET_SEMAPHORE                              0x5
+#define DMA_PACKET_FENCE                                  0x6
+#define DMA_PACKET_TRAP                                   0x7
+#define DMA_PACKET_SRBM_WRITE                             0x9
+#define DMA_PACKET_CONSTANT_FILL                          0xd
+#define DMA_PACKET_NOP                                    0xf
+
 /* PCIE link stuff */
 #define PCIE_LC_TRAINING_CNTL                             0xa1 /* PCIE_P */
 #define PCIE_LC_LINK_WIDTH_CNTL                           0xa2 /* PCIE_P */
diff --git a/drivers/gpu/drm/radeon/radeon_asic.c b/drivers/gpu/drm/radeon/radeon_asic.c
index 3cf9b29fb53f..1dd8d927e035 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.c
+++ b/drivers/gpu/drm/radeon/radeon_asic.c
@@ -1199,6 +1199,15 @@ static struct radeon_asic evergreen_asic = {
                         .ring_test = &r600_ring_test,
                         .ib_test = &r600_ib_test,
                         .is_lockup = &evergreen_gpu_is_lockup,
+                },
+                [R600_RING_TYPE_DMA_INDEX] = {
+                        .ib_execute = &evergreen_dma_ring_ib_execute,
+                        .emit_fence = &evergreen_dma_fence_ring_emit,
+                        .emit_semaphore = &r600_dma_semaphore_ring_emit,
+                        .cs_parse = NULL,
+                        .ring_test = &r600_dma_ring_test,
+                        .ib_test = &r600_dma_ib_test,
+                        .is_lockup = &r600_dma_is_lockup,
                 }
         },
         .irq = {
@@ -1215,8 +1224,8 @@ static struct radeon_asic evergreen_asic = {
         .copy = {
                 .blit = &r600_copy_blit,
                 .blit_ring_index = RADEON_RING_TYPE_GFX_INDEX,
-                .dma = NULL,
-                .dma_ring_index = RADEON_RING_TYPE_GFX_INDEX,
+                .dma = &evergreen_copy_dma,
+                .dma_ring_index = R600_RING_TYPE_DMA_INDEX,
                 .copy = &r600_copy_blit,
                 .copy_ring_index = RADEON_RING_TYPE_GFX_INDEX,
         },
@@ -1275,6 +1284,15 @@ static struct radeon_asic sumo_asic = {
                         .ib_test = &r600_ib_test,
                         .is_lockup = &evergreen_gpu_is_lockup,
                 },
+                [R600_RING_TYPE_DMA_INDEX] = {
+                        .ib_execute = &evergreen_dma_ring_ib_execute,
+                        .emit_fence = &evergreen_dma_fence_ring_emit,
+                        .emit_semaphore = &r600_dma_semaphore_ring_emit,
+                        .cs_parse = NULL,
+                        .ring_test = &r600_dma_ring_test,
+                        .ib_test = &r600_dma_ib_test,
+                        .is_lockup = &r600_dma_is_lockup,
+                }
         },
         .irq = {
                 .set = &evergreen_irq_set,
@@ -1290,8 +1308,8 @@ static struct radeon_asic sumo_asic = {
         .copy = {
                 .blit = &r600_copy_blit,
                 .blit_ring_index = RADEON_RING_TYPE_GFX_INDEX,
-                .dma = NULL,
-                .dma_ring_index = RADEON_RING_TYPE_GFX_INDEX,
+                .dma = &evergreen_copy_dma,
+                .dma_ring_index = R600_RING_TYPE_DMA_INDEX,
                 .copy = &r600_copy_blit,
                 .copy_ring_index = RADEON_RING_TYPE_GFX_INDEX,
         },
@@ -1349,6 +1367,15 @@ static struct radeon_asic btc_asic = {
                         .ring_test = &r600_ring_test,
                         .ib_test = &r600_ib_test,
                         .is_lockup = &evergreen_gpu_is_lockup,
+                },
+                [R600_RING_TYPE_DMA_INDEX] = {
+                        .ib_execute = &evergreen_dma_ring_ib_execute,
+                        .emit_fence = &evergreen_dma_fence_ring_emit,
+                        .emit_semaphore = &r600_dma_semaphore_ring_emit,
+                        .cs_parse = NULL,
+                        .ring_test = &r600_dma_ring_test,
+                        .ib_test = &r600_dma_ib_test,
+                        .is_lockup = &r600_dma_is_lockup,
                 }
         },
         .irq = {
@@ -1365,8 +1392,8 @@ static struct radeon_asic btc_asic = {
         .copy = {
                 .blit = &r600_copy_blit,
                 .blit_ring_index = RADEON_RING_TYPE_GFX_INDEX,
-                .dma = NULL,
-                .dma_ring_index = RADEON_RING_TYPE_GFX_INDEX,
+                .dma = &evergreen_copy_dma,
+                .dma_ring_index = R600_RING_TYPE_DMA_INDEX,
                 .copy = &r600_copy_blit,
                 .copy_ring_index = RADEON_RING_TYPE_GFX_INDEX,
         },
diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h
index 70a5b1f0e43e..7a2705d0a4d9 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.h
+++ b/drivers/gpu/drm/radeon/radeon_asic.h
@@ -441,6 +441,14 @@ extern void dce4_wait_for_vblank(struct radeon_device *rdev, int crtc);
 void evergreen_disable_interrupt_state(struct radeon_device *rdev);
 int evergreen_blit_init(struct radeon_device *rdev);
 int evergreen_mc_wait_for_idle(struct radeon_device *rdev);
+void evergreen_dma_fence_ring_emit(struct radeon_device *rdev,
+                                   struct radeon_fence *fence);
+void evergreen_dma_ring_ib_execute(struct radeon_device *rdev,
+                                   struct radeon_ib *ib);
+int evergreen_copy_dma(struct radeon_device *rdev,
+                       uint64_t src_offset, uint64_t dst_offset,
+                       unsigned num_gpu_pages,
+                       struct radeon_fence **fence);
 
 /*
  * cayman