drm/amdgpu: add DMA implementation for si v8

v4: rebase fixes
v5: use the generic nop fill
v6: rebase fixes
v7: rebase fixes
    copy count fixes from Jonathan
    general cleanup
    add fill buffer implementation
v8: adapt write_pte and copy_pte to latest changes
Signed-off-by: Ken Wang <Qingqing.Wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -1706,6 +1706,10 @@ struct amdgpu_sdma_instance {
 
 struct amdgpu_sdma {
 	struct amdgpu_sdma_instance instance[AMDGPU_MAX_SDMA_INSTANCES];
+#ifdef CONFIG_DRM_AMDGPU_SI
+	//SI DMA has a difference trap irq number for the second engine
+	struct amdgpu_irq_src	trap_irq_1;
+#endif
 	struct amdgpu_irq_src	trap_irq;
 	struct amdgpu_irq_src	illegal_inst_irq;
 	int			num_instances;

drivers/gpu/drm/amd/amdgpu/si_dma.c

+/*
+ * Copyright 2015 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Alex Deucher
+ */
+#include <drm/drmP.h>
+#include "amdgpu.h"
+#include "amdgpu_trace.h"
+#include "si/sid.h"
+
+const u32 sdma_offsets[SDMA_MAX_INSTANCE] =
+{
+	DMA0_REGISTER_OFFSET,
+	DMA1_REGISTER_OFFSET
+};
+
+static void si_dma_set_ring_funcs(struct amdgpu_device *adev);
+static void si_dma_set_buffer_funcs(struct amdgpu_device *adev);
+static void si_dma_set_vm_pte_funcs(struct amdgpu_device *adev);
+static void si_dma_set_irq_funcs(struct amdgpu_device *adev);
+
+static uint32_t si_dma_ring_get_rptr(struct amdgpu_ring *ring)
+{
+	u32 rptr;
+
+	rptr = ring->adev->wb.wb[ring->rptr_offs/4];
+
+	return rptr;
+}
+
+static uint32_t si_dma_ring_get_wptr(struct amdgpu_ring *ring)
+{
+
+	struct amdgpu_device *adev = ring->adev;
+	u32 me = (ring == &adev->sdma.instance[0].ring) ? 0 : 1;
+
+	return (RREG32(DMA_RB_WPTR + sdma_offsets[me]) & 0x3fffc) >> 2;
+}
+
+static void si_dma_ring_set_wptr(struct amdgpu_ring *ring)
+{
+	struct amdgpu_device *adev = ring->adev;
+	u32 me = (ring == &adev->sdma.instance[0].ring) ? 0 : 1;
+
+	WREG32(DMA_RB_WPTR + sdma_offsets[me], (ring->wptr << 2) & 0x3fffc);
+}
+
+static void si_dma_ring_emit_ib(struct amdgpu_ring *ring,
+				struct amdgpu_ib *ib,
+				unsigned vm_id, bool ctx_switch)
+{
+	/* 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)
+		amdgpu_ring_write(ring, DMA_PACKET(DMA_PACKET_NOP, 0, 0, 0, 0));
+	amdgpu_ring_write(ring, DMA_IB_PACKET(DMA_PACKET_INDIRECT_BUFFER, vm_id, 0));
+	amdgpu_ring_write(ring, (ib->gpu_addr & 0xFFFFFFE0));
+	amdgpu_ring_write(ring, (ib->length_dw << 12) | (upper_32_bits(ib->gpu_addr) & 0xFF));
+
+}
+
+static void si_dma_ring_emit_hdp_flush(struct amdgpu_ring *ring)
+{
+	amdgpu_ring_write(ring, DMA_PACKET(DMA_PACKET_SRBM_WRITE, 0, 0, 0, 0));
+	amdgpu_ring_write(ring, (0xf << 16) | (HDP_MEM_COHERENCY_FLUSH_CNTL));
+	amdgpu_ring_write(ring, 1);
+}
+
+static void si_dma_ring_emit_hdp_invalidate(struct amdgpu_ring *ring)
+{
+	amdgpu_ring_write(ring, DMA_PACKET(DMA_PACKET_SRBM_WRITE, 0, 0, 0, 0));
+	amdgpu_ring_write(ring, (0xf << 16) | (HDP_DEBUG0));
+	amdgpu_ring_write(ring, 1);
+}
+
+/**
+ * si_dma_ring_emit_fence - emit a fence on the DMA ring
+ *
+ * @ring: amdgpu ring pointer
+ * @fence: amdgpu 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 (VI).
+ */
+static void si_dma_ring_emit_fence(struct amdgpu_ring *ring, u64 addr, u64 seq,
+				      unsigned flags)
+{
+
+	bool write64bit = flags & AMDGPU_FENCE_FLAG_64BIT;
+	/* write the fence */
+	amdgpu_ring_write(ring, DMA_PACKET(DMA_PACKET_FENCE, 0, 0, 0, 0));
+	amdgpu_ring_write(ring, addr & 0xfffffffc);
+	amdgpu_ring_write(ring, (upper_32_bits(addr) & 0xff));
+	amdgpu_ring_write(ring, seq);
+	/* optionally write high bits as well */
+	if (write64bit) {
+		addr += 4;
+		amdgpu_ring_write(ring, DMA_PACKET(DMA_PACKET_FENCE, 0, 0, 0, 0));
+		amdgpu_ring_write(ring, addr & 0xfffffffc);
+		amdgpu_ring_write(ring, (upper_32_bits(addr) & 0xff));
+		amdgpu_ring_write(ring, upper_32_bits(seq));
+	}
+	/* generate an interrupt */
+	amdgpu_ring_write(ring, DMA_PACKET(DMA_PACKET_TRAP, 0, 0, 0, 0));
+}
+
+static void si_dma_stop(struct amdgpu_device *adev)
+{
+	struct amdgpu_ring *ring;
+	u32 rb_cntl;
+	unsigned i;
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		ring = &adev->sdma.instance[i].ring;
+		/* dma0 */
+		rb_cntl = RREG32(DMA_RB_CNTL + sdma_offsets[i]);
+		rb_cntl &= ~DMA_RB_ENABLE;
+		WREG32(DMA_RB_CNTL + sdma_offsets[i], rb_cntl);
+
+		ring->ready = false;
+	}
+}
+
+static int si_dma_start(struct amdgpu_device *adev)
+{
+	struct amdgpu_ring *ring;
+	u32 rb_cntl, dma_cntl, ib_cntl, rb_bufsz;
+	int i, r;
+	uint64_t rptr_addr;
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		ring = &adev->sdma.instance[i].ring;
+
+		WREG32(DMA_SEM_INCOMPLETE_TIMER_CNTL + sdma_offsets[i], 0);
+		WREG32(DMA_SEM_WAIT_FAIL_TIMER_CNTL + sdma_offsets[i], 0);
+
+		/* Set ring buffer size in dwords */
+		rb_bufsz = order_base_2(ring->ring_size / 4);
+		rb_cntl = rb_bufsz << 1;
+#ifdef __BIG_ENDIAN
+		rb_cntl |= DMA_RB_SWAP_ENABLE | DMA_RPTR_WRITEBACK_SWAP_ENABLE;
+#endif
+		WREG32(DMA_RB_CNTL + sdma_offsets[i], rb_cntl);
+
+		/* Initialize the ring buffer's read and write pointers */
+		WREG32(DMA_RB_RPTR + sdma_offsets[i], 0);
+		WREG32(DMA_RB_WPTR + sdma_offsets[i], 0);
+
+		rptr_addr = adev->wb.gpu_addr + (ring->rptr_offs * 4);
+
+		WREG32(DMA_RB_RPTR_ADDR_LO + sdma_offsets[i], lower_32_bits(rptr_addr));
+		WREG32(DMA_RB_RPTR_ADDR_HI + sdma_offsets[i], upper_32_bits(rptr_addr) & 0xFF);
+
+		rb_cntl |= DMA_RPTR_WRITEBACK_ENABLE;
+
+		WREG32(DMA_RB_BASE + sdma_offsets[i], ring->gpu_addr >> 8);
+
+		/* enable DMA IBs */
+		ib_cntl = DMA_IB_ENABLE | CMD_VMID_FORCE;
+#ifdef __BIG_ENDIAN
+		ib_cntl |= DMA_IB_SWAP_ENABLE;
+#endif
+		WREG32(DMA_IB_CNTL + sdma_offsets[i], ib_cntl);
+
+		dma_cntl = RREG32(DMA_CNTL + sdma_offsets[i]);
+		dma_cntl &= ~CTXEMPTY_INT_ENABLE;
+		WREG32(DMA_CNTL + sdma_offsets[i], dma_cntl);
+
+		ring->wptr = 0;
+		WREG32(DMA_RB_WPTR + sdma_offsets[i], ring->wptr << 2);
+
+		WREG32(DMA_RB_CNTL + sdma_offsets[i], rb_cntl | DMA_RB_ENABLE);
+
+		ring->ready = true;
+
+		r = amdgpu_ring_test_ring(ring);
+		if (r) {
+			ring->ready = false;
+			return r;
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * si_dma_ring_test_ring - simple async dma engine test
+ *
+ * @ring: amdgpu_ring structure holding ring information
+ *
+ * Test the DMA engine by writing using it to write an
+ * value to memory. (VI).
+ * Returns 0 for success, error for failure.
+ */
+static int si_dma_ring_test_ring(struct amdgpu_ring *ring)
+{
+	struct amdgpu_device *adev = ring->adev;
+	unsigned i;
+	unsigned index;
+	int r;
+	u32 tmp;
+	u64 gpu_addr;
+
+	r = amdgpu_wb_get(adev, &index);
+	if (r) {
+		dev_err(adev->dev, "(%d) failed to allocate wb slot\n", r);
+		return r;
+	}
+
+	gpu_addr = adev->wb.gpu_addr + (index * 4);
+	tmp = 0xCAFEDEAD;
+	adev->wb.wb[index] = cpu_to_le32(tmp);
+
+	r = amdgpu_ring_alloc(ring, 4);
+	if (r) {
+		DRM_ERROR("amdgpu: dma failed to lock ring %d (%d).\n", ring->idx, r);
+		amdgpu_wb_free(adev, index);
+		return r;
+	}
+
+	amdgpu_ring_write(ring, DMA_PACKET(DMA_PACKET_WRITE, 0, 0, 0, 1));
+	amdgpu_ring_write(ring, lower_32_bits(gpu_addr));
+	amdgpu_ring_write(ring, upper_32_bits(gpu_addr) & 0xff);
+	amdgpu_ring_write(ring, 0xDEADBEEF);
+	amdgpu_ring_commit(ring);
+
+	for (i = 0; i < adev->usec_timeout; i++) {
+		tmp = le32_to_cpu(adev->wb.wb[index]);
+		if (tmp == 0xDEADBEEF)
+			break;
+		DRM_UDELAY(1);
+	}
+
+	if (i < adev->usec_timeout) {
+		DRM_INFO("ring test on %d succeeded in %d usecs\n", ring->idx, i);
+	} else {
+		DRM_ERROR("amdgpu: ring %d test failed (0x%08X)\n",
+			  ring->idx, tmp);
+		r = -EINVAL;
+	}
+	amdgpu_wb_free(adev, index);
+
+	return r;
+}
+
+/**
+ * si_dma_ring_test_ib - test an IB on the DMA engine
+ *
+ * @ring: amdgpu_ring structure holding ring information
+ *
+ * Test a simple IB in the DMA ring (VI).
+ * Returns 0 on success, error on failure.
+ */
+static int si_dma_ring_test_ib(struct amdgpu_ring *ring, long timeout)
+{
+	struct amdgpu_device *adev = ring->adev;
+	struct amdgpu_ib ib;
+	struct fence *f = NULL;
+	unsigned index;
+	u32 tmp = 0;
+	u64 gpu_addr;
+	long r;
+
+	r = amdgpu_wb_get(adev, &index);
+	if (r) {
+		dev_err(adev->dev, "(%ld) failed to allocate wb slot\n", r);
+		return r;
+	}
+
+	gpu_addr = adev->wb.gpu_addr + (index * 4);
+	tmp = 0xCAFEDEAD;
+	adev->wb.wb[index] = cpu_to_le32(tmp);
+	memset(&ib, 0, sizeof(ib));
+	r = amdgpu_ib_get(adev, NULL, 256, &ib);
+	if (r) {
+		DRM_ERROR("amdgpu: failed to get ib (%ld).\n", r);
+		goto err0;
+	}
+
+	ib.ptr[0] = DMA_PACKET(DMA_PACKET_WRITE, 0, 0, 0, 1);
+	ib.ptr[1] = lower_32_bits(gpu_addr);
+	ib.ptr[2] = upper_32_bits(gpu_addr) & 0xff;
+	ib.ptr[3] = 0xDEADBEEF;
+	ib.length_dw = 4;
+	r = amdgpu_ib_schedule(ring, 1, &ib, NULL, NULL, &f);
+	if (r)
+		goto err1;
+
+	r = fence_wait_timeout(f, false, timeout);
+	if (r == 0) {
+		DRM_ERROR("amdgpu: IB test timed out\n");
+		r = -ETIMEDOUT;
+		goto err1;
+	} else if (r < 0) {
+		DRM_ERROR("amdgpu: fence wait failed (%ld).\n", r);
+		goto err1;
+	}
+	tmp = le32_to_cpu(adev->wb.wb[index]);
+	if (tmp == 0xDEADBEEF) {
+		DRM_INFO("ib test on ring %d succeeded\n", ring->idx);
+		r = 0;
+	} else {
+		DRM_ERROR("amdgpu: ib test failed (0x%08X)\n", tmp);
+		r = -EINVAL;
+	}
+
+err1:
+	amdgpu_ib_free(adev, &ib, NULL);
+	fence_put(f);
+err0:
+	amdgpu_wb_free(adev, index);
+	return r;
+}
+
+/**
+ * cik_dma_vm_copy_pte - update PTEs by copying them from the GART
+ *
+ * @ib: indirect buffer to fill with commands
+ * @pe: addr of the page entry
+ * @src: src addr to copy from
+ * @count: number of page entries to update
+ *
+ * Update PTEs by copying them from the GART using DMA (SI).
+ */
+static void si_dma_vm_copy_pte(struct amdgpu_ib *ib,
+			       uint64_t pe, uint64_t src,
+			       unsigned count)
+{
+	unsigned bytes = count * 8;
+
+	ib->ptr[ib->length_dw++] = DMA_PACKET(DMA_PACKET_COPY,
+					      1, 0, 0, bytes);
+	ib->ptr[ib->length_dw++] = lower_32_bits(pe);
+	ib->ptr[ib->length_dw++] = lower_32_bits(src);
+	ib->ptr[ib->length_dw++] = upper_32_bits(pe) & 0xff;
+	ib->ptr[ib->length_dw++] = upper_32_bits(src) & 0xff;
+}
+
+/**
+ * si_dma_vm_write_pte - update PTEs by writing them manually
+ *
+ * @ib: indirect buffer to fill with commands
+ * @pe: addr of the page entry
+ * @value: dst addr to write into pe
+ * @count: number of page entries to update
+ * @incr: increase next addr by incr bytes
+ *
+ * Update PTEs by writing them manually using DMA (SI).
+ */
+static void si_dma_vm_write_pte(struct amdgpu_ib *ib, uint64_t pe,
+				uint64_t value, unsigned count,
+				uint32_t incr)
+{
+	unsigned ndw = count * 2;
+
+	ib->ptr[ib->length_dw++] = DMA_PACKET(DMA_PACKET_WRITE, 0, 0, 0, ndw);
+	ib->ptr[ib->length_dw++] = lower_32_bits(pe);
+	ib->ptr[ib->length_dw++] = upper_32_bits(pe);
+	for (; ndw > 0; ndw -= 2) {
+		ib->ptr[ib->length_dw++] = lower_32_bits(value);
+		ib->ptr[ib->length_dw++] = upper_32_bits(value);
+		value += incr;
+	}
+}
+
+/**
+ * si_dma_vm_set_pte_pde - update the page tables using sDMA
+ *
+ * @ib: indirect buffer to fill with commands
+ * @pe: addr of the page entry
+ * @addr: dst addr to write into pe
+ * @count: number of page entries to update
+ * @incr: increase next addr by incr bytes
+ * @flags: access flags
+ *
+ * Update the page tables using sDMA (CIK).
+ */
+static void si_dma_vm_set_pte_pde(struct amdgpu_ib *ib,
+				     uint64_t pe,
+				     uint64_t addr, unsigned count,
+				     uint32_t incr, uint32_t flags)
+{
+	uint64_t value;
+	unsigned ndw;
+
+	while (count) {
+		ndw = count * 2;
+		if (ndw > 0xFFFFE)
+			ndw = 0xFFFFE;
+
+		if (flags & AMDGPU_PTE_VALID)
+			value = addr;
+		else
+			value = 0;
+
+		/* for physically contiguous pages (vram) */
+		ib->ptr[ib->length_dw++] = DMA_PTE_PDE_PACKET(ndw);
+		ib->ptr[ib->length_dw++] = pe; /* dst addr */
+		ib->ptr[ib->length_dw++] = upper_32_bits(pe) & 0xff;
+		ib->ptr[ib->length_dw++] = flags; /* mask */
+		ib->ptr[ib->length_dw++] = 0;
+		ib->ptr[ib->length_dw++] = value; /* value */
+		ib->ptr[ib->length_dw++] = upper_32_bits(value);
+		ib->ptr[ib->length_dw++] = incr; /* increment size */
+		ib->ptr[ib->length_dw++] = 0;
+		pe += ndw * 4;
+		addr += (ndw / 2) * incr;
+		count -= ndw / 2;
+	}
+}
+
+/**
+ * si_dma_pad_ib - pad the IB to the required number of dw
+ *
+ * @ib: indirect buffer to fill with padding
+ *
+ */
+static void si_dma_ring_pad_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib)
+{
+	while (ib->length_dw & 0x7)
+		ib->ptr[ib->length_dw++] = DMA_PACKET(DMA_PACKET_NOP, 0, 0, 0, 0);
+}
+
+/**
+ * cik_sdma_ring_emit_pipeline_sync - sync the pipeline
+ *
+ * @ring: amdgpu_ring pointer
+ *
+ * Make sure all previous operations are completed (CIK).
+ */
+static void si_dma_ring_emit_pipeline_sync(struct amdgpu_ring *ring)
+{
+	uint32_t seq = ring->fence_drv.sync_seq;
+	uint64_t addr = ring->fence_drv.gpu_addr;
+
+	/* wait for idle */
+	amdgpu_ring_write(ring, DMA_PACKET(DMA_PACKET_POLL_REG_MEM, 0, 0, 0, 0) |
+			  (1 << 27)); /* Poll memory */
+	amdgpu_ring_write(ring, lower_32_bits(addr));
+	amdgpu_ring_write(ring, (0xff << 16) | upper_32_bits(addr)); /* retry, addr_hi */
+	amdgpu_ring_write(ring, 0xffffffff); /* mask */
+	amdgpu_ring_write(ring, seq); /* value */
+	amdgpu_ring_write(ring, (3 << 28) | 0x20); /* func(equal) | poll interval */
+}
+
+/**
+ * si_dma_ring_emit_vm_flush - cik vm flush using sDMA
+ *
+ * @ring: amdgpu_ring pointer
+ * @vm: amdgpu_vm pointer
+ *
+ * Update the page table base and flush the VM TLB
+ * using sDMA (VI).
+ */
+static void si_dma_ring_emit_vm_flush(struct amdgpu_ring *ring,
+				      unsigned vm_id, uint64_t pd_addr)
+{
+	amdgpu_ring_write(ring, DMA_PACKET(DMA_PACKET_SRBM_WRITE, 0, 0, 0, 0));
+	if (vm_id < 8) {
+		amdgpu_ring_write(ring, (0xf << 16) | (VM_CONTEXT0_PAGE_TABLE_BASE_ADDR + vm_id));
+	} else {
+		amdgpu_ring_write(ring, (0xf << 16) | (VM_CONTEXT8_PAGE_TABLE_BASE_ADDR + (vm_id - 8)));
+	}
+	amdgpu_ring_write(ring, pd_addr >> 12);
+
+	/* bits 0-7 are the VM contexts0-7 */
+	amdgpu_ring_write(ring, DMA_PACKET(DMA_PACKET_SRBM_WRITE, 0, 0, 0, 0));
+	amdgpu_ring_write(ring, (0xf << 16) | (VM_INVALIDATE_REQUEST));
+	amdgpu_ring_write(ring, 1 << vm_id);
+
+	/* wait for invalidate to complete */
+	amdgpu_ring_write(ring, DMA_PACKET(DMA_PACKET_POLL_REG_MEM, 0, 0, 0, 0));
+	amdgpu_ring_write(ring, VM_INVALIDATE_REQUEST);
+	amdgpu_ring_write(ring, 0xff << 16); /* retry */
+	amdgpu_ring_write(ring, 1 << vm_id); /* mask */
+	amdgpu_ring_write(ring, 0); /* value */
+	amdgpu_ring_write(ring, (0 << 28) | 0x20); /* func(always) | poll interval */
+}
+
+static int si_dma_early_init(void *handle)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	adev->sdma.num_instances = 2;
+
+	si_dma_set_ring_funcs(adev);
+	si_dma_set_buffer_funcs(adev);
+	si_dma_set_vm_pte_funcs(adev);
+	si_dma_set_irq_funcs(adev);
+
+	return 0;
+}
+
+static int si_dma_sw_init(void *handle)
+{
+	struct amdgpu_ring *ring;
+	int r, i;
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	/* DMA0 trap event */
+	r = amdgpu_irq_add_id(adev, 224, &adev->sdma.trap_irq);
+	if (r)
+		return r;
+
+	/* DMA1 trap event */
+	r = amdgpu_irq_add_id(adev, 244, &adev->sdma.trap_irq_1);
+	if (r)
+		return r;
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		ring = &adev->sdma.instance[i].ring;
+		ring->ring_obj = NULL;
+		ring->use_doorbell = false;
+		sprintf(ring->name, "sdma%d", i);
+		r = amdgpu_ring_init(adev, ring, 1024,
+				     DMA_PACKET(DMA_PACKET_NOP, 0, 0, 0, 0), 0xf,
+				     &adev->sdma.trap_irq,
+				     (i == 0) ?
+				     AMDGPU_SDMA_IRQ_TRAP0 : AMDGPU_SDMA_IRQ_TRAP1,
+				     AMDGPU_RING_TYPE_SDMA);
+		if (r)
+			return r;
+	}
+
+	return r;
+}
+
+static int si_dma_sw_fini(void *handle)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+	int i;
+
+	for (i = 0; i < adev->sdma.num_instances; i++)
+		amdgpu_ring_fini(&adev->sdma.instance[i].ring);
+
+	return 0;
+}
+
+static int si_dma_hw_init(void *handle)
+{
+	int r;
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	r = si_dma_start(adev);
+	if (r)
+		return r;
+
+	return r;
+}
+
+static int si_dma_hw_fini(void *handle)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	si_dma_stop(adev);
+
+	return 0;
+}
+
+static int si_dma_suspend(void *handle)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	return si_dma_hw_fini(adev);
+}
+
+static int si_dma_resume(void *handle)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	return si_dma_hw_init(adev);
+}
+
+static bool si_dma_is_idle(void *handle)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+	u32 tmp = RREG32(SRBM_STATUS2);
+
+	if (tmp & (DMA_BUSY_MASK | DMA1_BUSY_MASK))
+	    return false;
+
+	return true;
+}
+
+static int si_dma_wait_for_idle(void *handle)
+{
+	unsigned i;
+	u32 tmp;
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	for (i = 0; i < adev->usec_timeout; i++) {
+		tmp = RREG32(SRBM_STATUS2) & (DMA_BUSY_MASK | DMA1_BUSY_MASK);
+
+		if (!tmp)
+			return 0;
+		udelay(1);
+	}
+	return -ETIMEDOUT;
+}
+
+static int si_dma_soft_reset(void *handle)
+{
+	DRM_INFO("si_dma_soft_reset --- not implemented !!!!!!!\n");
+	return 0;
+}
+
+static int si_dma_set_trap_irq_state(struct amdgpu_device *adev,
+					struct amdgpu_irq_src *src,
+					unsigned type,
+					enum amdgpu_interrupt_state state)
+{
+	u32 sdma_cntl;
+
+	switch (type) {
+	case AMDGPU_SDMA_IRQ_TRAP0:
+		switch (state) {
+		case AMDGPU_IRQ_STATE_DISABLE:
+			sdma_cntl = RREG32(DMA_CNTL + DMA0_REGISTER_OFFSET);
+			sdma_cntl &= ~TRAP_ENABLE;
+			WREG32(DMA_CNTL + DMA0_REGISTER_OFFSET, sdma_cntl);
+			break;
+		case AMDGPU_IRQ_STATE_ENABLE:
+			sdma_cntl = RREG32(DMA_CNTL + DMA0_REGISTER_OFFSET);
+			sdma_cntl |= TRAP_ENABLE;
+			WREG32(DMA_CNTL + DMA0_REGISTER_OFFSET, sdma_cntl);
+			break;
+		default:
+			break;
+		}
+		break;
+	case AMDGPU_SDMA_IRQ_TRAP1:
+		switch (state) {
+		case AMDGPU_IRQ_STATE_DISABLE:
+			sdma_cntl = RREG32(DMA_CNTL + DMA1_REGISTER_OFFSET);
+			sdma_cntl &= ~TRAP_ENABLE;
+			WREG32(DMA_CNTL + DMA1_REGISTER_OFFSET, sdma_cntl);
+			break;
+		case AMDGPU_IRQ_STATE_ENABLE:
+			sdma_cntl = RREG32(DMA_CNTL + DMA1_REGISTER_OFFSET);
+			sdma_cntl |= TRAP_ENABLE;
+			WREG32(DMA_CNTL + DMA1_REGISTER_OFFSET, sdma_cntl);
+			break;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
+
+static int si_dma_process_trap_irq(struct amdgpu_device *adev,
+				      struct amdgpu_irq_src *source,
+				      struct amdgpu_iv_entry *entry)
+{
+	u8 instance_id, queue_id;
+
+	instance_id = (entry->ring_id & 0x3) >> 0;
+	queue_id = (entry->ring_id & 0xc) >> 2;
+
+	amdgpu_fence_process(&adev->sdma.instance[0].ring);
+
+	return 0;
+}
+
+static int si_dma_process_trap_irq_1(struct amdgpu_device *adev,
+				      struct amdgpu_irq_src *source,
+				      struct amdgpu_iv_entry *entry)
+{
+	u8 instance_id, queue_id;
+
+	instance_id = (entry->ring_id & 0x3) >> 0;
+	queue_id = (entry->ring_id & 0xc) >> 2;
+
+	amdgpu_fence_process(&adev->sdma.instance[1].ring);
+
+	return 0;
+}
+
+static int si_dma_process_illegal_inst_irq(struct amdgpu_device *adev,
+					      struct amdgpu_irq_src *source,
+					      struct amdgpu_iv_entry *entry)
+{
+	DRM_ERROR("Illegal instruction in SDMA command stream\n");
+	schedule_work(&adev->reset_work);
+	return 0;
+}
+
+static int si_dma_set_clockgating_state(void *handle,
+					  enum amd_clockgating_state state)
+{
+	u32 orig, data, offset;
+	int i;
+	bool enable;
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	enable = (state == AMD_CG_STATE_GATE) ? true : false;
+
+	if (enable && (adev->cg_flags & AMD_CG_SUPPORT_SDMA_MGCG)) {
+		for (i = 0; i < adev->sdma.num_instances; i++) {
+			if (i == 0)
+				offset = DMA0_REGISTER_OFFSET;
+			else
+				offset = DMA1_REGISTER_OFFSET;
+			orig = data = RREG32(DMA_POWER_CNTL + offset);
+			data &= ~MEM_POWER_OVERRIDE;
+			if (data != orig)
+				WREG32(DMA_POWER_CNTL + offset, data);
+			WREG32(DMA_CLK_CTRL + offset, 0x00000100);
+		}
+	} else {
+		for (i = 0; i < adev->sdma.num_instances; i++) {
+			if (i == 0)
+				offset = DMA0_REGISTER_OFFSET;
+			else
+				offset = DMA1_REGISTER_OFFSET;
+			orig = data = RREG32(DMA_POWER_CNTL + offset);
+			data |= MEM_POWER_OVERRIDE;
+			if (data != orig)
+				WREG32(DMA_POWER_CNTL + offset, data);
+
+			orig = data = RREG32(DMA_CLK_CTRL + offset);
+			data = 0xff000000;
+			if (data != orig)
+				WREG32(DMA_CLK_CTRL + offset, data);
+		}
+	}
+
+	return 0;
+}
+
+static int si_dma_set_powergating_state(void *handle,
+					  enum amd_powergating_state state)
+{
+	u32 tmp;
+
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	WREG32(DMA_PGFSM_WRITE,  0x00002000);
+	WREG32(DMA_PGFSM_CONFIG, 0x100010ff);
+
+	for (tmp = 0; tmp < 5; tmp++)
+		WREG32(DMA_PGFSM_WRITE, 0);
+
+	return 0;
+}
+
+const struct amd_ip_funcs si_dma_ip_funcs = {
+	.name = "si_dma",
+	.early_init = si_dma_early_init,
+	.late_init = NULL,
+	.sw_init = si_dma_sw_init,
+	.sw_fini = si_dma_sw_fini,
+	.hw_init = si_dma_hw_init,
+	.hw_fini = si_dma_hw_fini,
+	.suspend = si_dma_suspend,
+	.resume = si_dma_resume,
+	.is_idle = si_dma_is_idle,
+	.wait_for_idle = si_dma_wait_for_idle,
+	.soft_reset = si_dma_soft_reset,
+	.set_clockgating_state = si_dma_set_clockgating_state,
+	.set_powergating_state = si_dma_set_powergating_state,
+};
+
+static const struct amdgpu_ring_funcs si_dma_ring_funcs = {
+	.get_rptr = si_dma_ring_get_rptr,
+	.get_wptr = si_dma_ring_get_wptr,
+	.set_wptr = si_dma_ring_set_wptr,
+	.parse_cs = NULL,
+	.emit_ib = si_dma_ring_emit_ib,
+	.emit_fence = si_dma_ring_emit_fence,
+	.emit_pipeline_sync = si_dma_ring_emit_pipeline_sync,
+	.emit_vm_flush = si_dma_ring_emit_vm_flush,
+	.emit_hdp_flush = si_dma_ring_emit_hdp_flush,
+	.emit_hdp_invalidate = si_dma_ring_emit_hdp_invalidate,
+	.test_ring = si_dma_ring_test_ring,
+	.test_ib = si_dma_ring_test_ib,
+	.insert_nop = amdgpu_ring_insert_nop,
+	.pad_ib = si_dma_ring_pad_ib,
+};
+
+static void si_dma_set_ring_funcs(struct amdgpu_device *adev)
+{
+	int i;
+
+	for (i = 0; i < adev->sdma.num_instances; i++)
+		adev->sdma.instance[i].ring.funcs = &si_dma_ring_funcs;
+}
+
+static const struct amdgpu_irq_src_funcs si_dma_trap_irq_funcs = {
+	.set = si_dma_set_trap_irq_state,
+	.process = si_dma_process_trap_irq,
+};
+
+static const struct amdgpu_irq_src_funcs si_dma_trap_irq_funcs_1 = {
+	.set = si_dma_set_trap_irq_state,
+	.process = si_dma_process_trap_irq_1,
+};
+
+static const struct amdgpu_irq_src_funcs si_dma_illegal_inst_irq_funcs = {
+	.process = si_dma_process_illegal_inst_irq,
+};
+
+static void si_dma_set_irq_funcs(struct amdgpu_device *adev)
+{
+	adev->sdma.trap_irq.num_types = AMDGPU_SDMA_IRQ_LAST;
+	adev->sdma.trap_irq.funcs = &si_dma_trap_irq_funcs;
+	adev->sdma.trap_irq_1.funcs = &si_dma_trap_irq_funcs_1;
+	adev->sdma.illegal_inst_irq.funcs = &si_dma_illegal_inst_irq_funcs;
+}
+
+/**
+ * si_dma_emit_copy_buffer - copy buffer using the sDMA engine
+ *
+ * @ring: amdgpu_ring structure holding ring information
+ * @src_offset: src GPU address
+ * @dst_offset: dst GPU address
+ * @byte_count: number of bytes to xfer
+ *
+ * Copy GPU buffers using the DMA engine (VI).
+ * Used by the amdgpu ttm implementation to move pages if
+ * registered as the asic copy callback.
+ */
+static void si_dma_emit_copy_buffer(struct amdgpu_ib *ib,
+				       uint64_t src_offset,
+				       uint64_t dst_offset,
+				       uint32_t byte_count)
+{
+	ib->ptr[ib->length_dw++] = DMA_PACKET(DMA_PACKET_COPY,
+					      1, 0, 0, byte_count);
+	ib->ptr[ib->length_dw++] = lower_32_bits(dst_offset);
+	ib->ptr[ib->length_dw++] = lower_32_bits(src_offset);
+	ib->ptr[ib->length_dw++] = upper_32_bits(dst_offset) & 0xff;
+	ib->ptr[ib->length_dw++] = upper_32_bits(src_offset) & 0xff;
+}
+
+/**
+ * si_dma_emit_fill_buffer - fill buffer using the sDMA engine
+ *
+ * @ring: amdgpu_ring structure holding ring information
+ * @src_data: value to write to buffer
+ * @dst_offset: dst GPU address
+ * @byte_count: number of bytes to xfer
+ *
+ * Fill GPU buffers using the DMA engine (VI).
+ */
+static void si_dma_emit_fill_buffer(struct amdgpu_ib *ib,
+				       uint32_t src_data,
+				       uint64_t dst_offset,
+				       uint32_t byte_count)
+{
+	ib->ptr[ib->length_dw++] = DMA_PACKET(DMA_PACKET_CONSTANT_FILL,
+					      0, 0, 0, byte_count / 4);
+	ib->ptr[ib->length_dw++] = lower_32_bits(dst_offset);
+	ib->ptr[ib->length_dw++] = src_data;
+	ib->ptr[ib->length_dw++] = upper_32_bits(dst_offset) << 16;
+}
+
+
+static const struct amdgpu_buffer_funcs si_dma_buffer_funcs = {
+	.copy_max_bytes = 0xffff8,
+	.copy_num_dw = 5,
+	.emit_copy_buffer = si_dma_emit_copy_buffer,
+
+	.fill_max_bytes = 0xffff8,
+	.fill_num_dw = 4,
+	.emit_fill_buffer = si_dma_emit_fill_buffer,
+};
+
+static void si_dma_set_buffer_funcs(struct amdgpu_device *adev)
+{
+	if (adev->mman.buffer_funcs == NULL) {
+		adev->mman.buffer_funcs = &si_dma_buffer_funcs;
+		adev->mman.buffer_funcs_ring = &adev->sdma.instance[0].ring;
+	}
+}
+
+static const struct amdgpu_vm_pte_funcs si_dma_vm_pte_funcs = {
+	.copy_pte = si_dma_vm_copy_pte,
+	.write_pte = si_dma_vm_write_pte,
+	.set_pte_pde = si_dma_vm_set_pte_pde,
+};
+
+static void si_dma_set_vm_pte_funcs(struct amdgpu_device *adev)
+{
+	unsigned i;
+
+	if (adev->vm_manager.vm_pte_funcs == NULL) {
+		adev->vm_manager.vm_pte_funcs = &si_dma_vm_pte_funcs;
+		for (i = 0; i < adev->sdma.num_instances; i++)
+			adev->vm_manager.vm_pte_rings[i] =
+				&adev->sdma.instance[i].ring;
+
+		adev->vm_manager.vm_pte_num_rings = adev->sdma.num_instances;
+	}
+}

drivers/gpu/drm/amd/amdgpu/si_dma.h

+/*
+ * Copyright 2015 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __SI_DMA_H__
+#define __SI_DMA_H__
+
+extern const struct amd_ip_funcs si_dma_ip_funcs;
+
+#endif

drivers/gpu/drm/amd/include/asic_reg/si/sid.h

@@ -642,6 +642,8 @@
 #define	HDP_NONSURFACE_INFO				0xB02
 #define	HDP_NONSURFACE_SIZE				0xB03
 
+#define HDP_DEBUG0  					0xBCC
+
 #define HDP_ADDR_CONFIG  				0xBD2
 #define HDP_MISC_CNTL					0xBD3
 #define 	HDP_FLUSH_INVALIDATE_CACHE			(1 << 0)