drm/amdgpu: add sdma ip block for sienna_cichlid (v5)

Sienna_Cichlid have 4 sdma controllers.

v2: add missing license to sdma_common.h (Alex)
v3: rebase (Alex)
v4: squash in policy fix (Alex)
v4: squash in fw_name fix

Signed-off-by: Likun Gao <[e-mail]>
Reviewed-by: Hawking Zhang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/Makefile

···
 	sdma_v2_4.o \
 	sdma_v3_0.o \
 	sdma_v4_0.o \
-	sdma_v5_0.o
+	sdma_v5_0.o \
+	sdma_v5_2.o
 
 # add MES block
 amdgpu-y += \

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

···
 	/* SDMA:256~335*/
 	AMDGPU_NAVI10_DOORBELL_sDMA_ENGINE0		= 0x100,
 	AMDGPU_NAVI10_DOORBELL_sDMA_ENGINE1		= 0x10A,
+	AMDGPU_NAVI10_DOORBELL_sDMA_ENGINE2		= 0x114,
+	AMDGPU_NAVI10_DOORBELL_sDMA_ENGINE3		= 0x11E,
 	/* IH: 376~391 */
 	AMDGPU_NAVI10_DOORBELL_IH			= 0x178,
 	/* MMSCH: 392~407

drivers/gpu/drm/amd/amdgpu/nbio_v2_3.c

···
 #define smnCPM_CONTROL		0x11180460
 #define smnPCIE_CNTL2		0x11180070
 
+#define mmBIF_SDMA2_DOORBELL_RANGE		0x01d6
+#define mmBIF_SDMA2_DOORBELL_RANGE_BASE_IDX	2
+#define mmBIF_SDMA3_DOORBELL_RANGE		0x01d7
+#define mmBIF_SDMA3_DOORBELL_RANGE_BASE_IDX	2
 
 static void nbio_v2_3_remap_hdp_registers(struct amdgpu_device *adev)
 {
···
 					  int doorbell_size)
 {
 	u32 reg = instance == 0 ? SOC15_REG_OFFSET(NBIO, 0, mmBIF_SDMA0_DOORBELL_RANGE) :
-			SOC15_REG_OFFSET(NBIO, 0, mmBIF_SDMA1_DOORBELL_RANGE);
+			instance == 1 ? SOC15_REG_OFFSET(NBIO, 0, mmBIF_SDMA1_DOORBELL_RANGE) :
+			instance == 2 ? SOC15_REG_OFFSET(NBIO, 0, mmBIF_SDMA2_DOORBELL_RANGE) :
+			SOC15_REG_OFFSET(NBIO, 0, mmBIF_SDMA3_DOORBELL_RANGE);
 
 	u32 doorbell_range = RREG32(reg);
 

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

···
 #include "navi10_ih.h"
 #include "gfx_v10_0.h"
 #include "sdma_v5_0.h"
+#include "sdma_v5_2.h"
 #include "vcn_v2_0.h"
 #include "jpeg_v2_0.h"
 #include "dce_virtual.h"
···
 		amdgpu_device_ip_block_add(adev, &gmc_v10_0_ip_block);
 		amdgpu_device_ip_block_add(adev, &navi10_ih_ip_block);
 		amdgpu_device_ip_block_add(adev, &gfx_v10_0_ip_block);
+		amdgpu_device_ip_block_add(adev, &sdma_v5_2_ip_block);
 		break;
 	default:
 		return -EINVAL;
···
 	adev->doorbell_index.gfx_ring1 = AMDGPU_NAVI10_DOORBELL_GFX_RING1;
 	adev->doorbell_index.sdma_engine[0] = AMDGPU_NAVI10_DOORBELL_sDMA_ENGINE0;
 	adev->doorbell_index.sdma_engine[1] = AMDGPU_NAVI10_DOORBELL_sDMA_ENGINE1;
+	adev->doorbell_index.sdma_engine[2] = AMDGPU_NAVI10_DOORBELL_sDMA_ENGINE2;
+	adev->doorbell_index.sdma_engine[3] = AMDGPU_NAVI10_DOORBELL_sDMA_ENGINE3;
 	adev->doorbell_index.ih = AMDGPU_NAVI10_DOORBELL_IH;
 	adev->doorbell_index.vcn.vcn_ring0_1 = AMDGPU_NAVI10_DOORBELL64_VCN0_1;
 	adev->doorbell_index.vcn.vcn_ring2_3 = AMDGPU_NAVI10_DOORBELL64_VCN2_3;

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

···
+/*
+ * Copyright 2019 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 __SDMA_COMMON_H__
+#define __SDMA_COMMON_H__
+
+enum sdma_utcl2_cache_read_policy {
+	CACHE_READ_POLICY_L2__LRU    = 0x00000000,
+	CACHE_READ_POLICY_L2__STREAM = 0x00000001,
+	CACHE_READ_POLICY_L2__NOA    = 0x00000002,
+	CACHE_READ_POLICY_L2__DEFAULT = CACHE_READ_POLICY_L2__NOA,
+};
+
+enum sdma_utcl2_cache_write_policy {
+	CACHE_WRITE_POLICY_L2__LRU    = 0x00000000,
+	CACHE_WRITE_POLICY_L2__STREAM = 0x00000001,
+	CACHE_WRITE_POLICY_L2__NOA    = 0x00000002,
+	CACHE_WRITE_POLICY_L2__BYPASS = 0x00000003,
+	CACHE_WRITE_POLICY_L2__DEFAULT = CACHE_WRITE_POLICY_L2__BYPASS,
+};
+
+#endif /* __SDMA_COMMON_H__ */

drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c

···
 #include "soc15.h"
 #include "navi10_sdma_pkt_open.h"
 #include "nbio_v2_3.h"
+#include "sdma_common.h"
 #include "sdma_v5_0.h"
 
 MODULE_FIRMWARE("amdgpu/navi10_sdma.bin");

drivers/gpu/drm/amd/amdgpu/sdma_v5_0.h

···
 #ifndef __SDMA_V5_0_H__
 #define __SDMA_V5_0_H__
 
-enum sdma_v5_0_utcl2_cache_read_policy {
-	CACHE_READ_POLICY_L2__LRU    = 0x00000000,
-	CACHE_READ_POLICY_L2__STREAM = 0x00000001,
-	CACHE_READ_POLICY_L2__NOA    = 0x00000002,
-	CACHE_READ_POLICY_L2__DEFAULT = CACHE_READ_POLICY_L2__NOA,
-};
-
-enum sdma_v5_0_utcl2_cache_write_policy {
-	CACHE_WRITE_POLICY_L2__LRU    = 0x00000000,
-	CACHE_WRITE_POLICY_L2__STREAM = 0x00000001,
-	CACHE_WRITE_POLICY_L2__NOA    = 0x00000002,
-	CACHE_WRITE_POLICY_L2__BYPASS = 0x00000003,
-	CACHE_WRITE_POLICY_L2__DEFAULT = CACHE_WRITE_POLICY_L2__BYPASS,
-};
-
 extern const struct amd_ip_funcs sdma_v5_0_ip_funcs;
 extern const struct amdgpu_ip_block_version sdma_v5_0_ip_block;
 

drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c

···
+/*
+ * Copyright 2019 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.
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include "amdgpu.h"
+#include "amdgpu_ucode.h"
+#include "amdgpu_trace.h"
+
+#include "gc/gc_10_3_0_offset.h"
+#include "gc/gc_10_3_0_sh_mask.h"
+#include "ivsrcid/sdma0/irqsrcs_sdma0_5_0.h"
+#include "ivsrcid/sdma1/irqsrcs_sdma1_5_0.h"
+#include "ivsrcid/sdma2/irqsrcs_sdma2_5_0.h"
+#include "ivsrcid/sdma3/irqsrcs_sdma3_5_0.h"
+
+#include "soc15_common.h"
+#include "soc15.h"
+#include "navi10_sdma_pkt_open.h"
+#include "nbio_v2_3.h"
+#include "sdma_common.h"
+#include "sdma_v5_2.h"
+
+MODULE_FIRMWARE("amdgpu/sienna_cichlid_sdma.bin");
+MODULE_FIRMWARE("amdgpu/sienna_cichlid_sdma1.bin");
+MODULE_FIRMWARE("amdgpu/sienna_cichlid_sdma2.bin");
+MODULE_FIRMWARE("amdgpu/sienna_cichlid_sdma3.bin");
+
+#define SDMA1_REG_OFFSET 0x600
+#define SDMA3_REG_OFFSET 0x400
+#define SDMA0_HYP_DEC_REG_START 0x5880
+#define SDMA0_HYP_DEC_REG_END 0x5893
+#define SDMA1_HYP_DEC_REG_OFFSET 0x20
+
+static void sdma_v5_2_set_ring_funcs(struct amdgpu_device *adev);
+static void sdma_v5_2_set_buffer_funcs(struct amdgpu_device *adev);
+static void sdma_v5_2_set_vm_pte_funcs(struct amdgpu_device *adev);
+static void sdma_v5_2_set_irq_funcs(struct amdgpu_device *adev);
+
+static u32 sdma_v5_2_get_reg_offset(struct amdgpu_device *adev, u32 instance, u32 internal_offset)
+{
+	u32 base;
+
+	if (internal_offset >= SDMA0_HYP_DEC_REG_START &&
+	    internal_offset <= SDMA0_HYP_DEC_REG_END) {
+		base = adev->reg_offset[GC_HWIP][0][1];
+		if (instance != 0)
+			internal_offset += SDMA1_HYP_DEC_REG_OFFSET * instance;
+	} else {
+		if (instance < 2) {
+			base = adev->reg_offset[GC_HWIP][0][0];
+			if (instance == 1)
+				internal_offset += SDMA1_REG_OFFSET;
+		} else {
+			base = adev->reg_offset[GC_HWIP][0][2];
+			if (instance == 3)
+				internal_offset += SDMA3_REG_OFFSET;
+		}
+	}
+
+	return base + internal_offset;
+}
+
+static void sdma_v5_2_init_golden_registers(struct amdgpu_device *adev)
+{
+	switch (adev->asic_type) {
+	case CHIP_SIENNA_CICHLID:
+		break;
+	default:
+		break;
+	}
+}
+
+/**
+ * sdma_v5_2_init_microcode - load ucode images from disk
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Use the firmware interface to load the ucode images into
+ * the driver (not loaded into hw).
+ * Returns 0 on success, error on failure.
+ */
+
+// emulation only, won't work on real chip
+// navi10 real chip need to use PSP to load firmware
+static int sdma_v5_2_init_microcode(struct amdgpu_device *adev)
+{
+	const char *chip_name;
+	char fw_name[40];
+	int err = 0, i;
+	struct amdgpu_firmware_info *info = NULL;
+	const struct common_firmware_header *header = NULL;
+	const struct sdma_firmware_header_v1_0 *hdr;
+
+	DRM_DEBUG("\n");
+
+	switch (adev->asic_type) {
+	case CHIP_SIENNA_CICHLID:
+		chip_name = "sienna_cichlid";
+		break;
+	default:
+		BUG();
+	}
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		if (i == 0)
+			snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_sdma.bin", chip_name);
+		else
+			snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_sdma%d.bin", chip_name, i);
+		err = request_firmware(&adev->sdma.instance[i].fw, fw_name, adev->dev);
+		if (err)
+			goto out;
+		err = amdgpu_ucode_validate(adev->sdma.instance[i].fw);
+		if (err)
+			goto out;
+		hdr = (const struct sdma_firmware_header_v1_0 *)adev->sdma.instance[i].fw->data;
+		adev->sdma.instance[i].fw_version = le32_to_cpu(hdr->header.ucode_version);
+		adev->sdma.instance[i].feature_version = le32_to_cpu(hdr->ucode_feature_version);
+		if (adev->sdma.instance[i].feature_version >= 20)
+			adev->sdma.instance[i].burst_nop = true;
+		DRM_DEBUG("psp_load == '%s'\n",
+				adev->firmware.load_type == AMDGPU_FW_LOAD_PSP ? "true" : "false");
+
+		if (adev->firmware.load_type == AMDGPU_FW_LOAD_PSP) {
+			info = &adev->firmware.ucode[AMDGPU_UCODE_ID_SDMA0 + i];
+			info->ucode_id = AMDGPU_UCODE_ID_SDMA0 + i;
+			info->fw = adev->sdma.instance[i].fw;
+			header = (const struct common_firmware_header *)info->fw->data;
+			adev->firmware.fw_size +=
+				ALIGN(le32_to_cpu(header->ucode_size_bytes), PAGE_SIZE);
+		}
+	}
+out:
+	if (err) {
+		DRM_ERROR("sdma_v5_2: Failed to load firmware \"%s\"\n", fw_name);
+		for (i = 0; i < adev->sdma.num_instances; i++) {
+			release_firmware(adev->sdma.instance[i].fw);
+			adev->sdma.instance[i].fw = NULL;
+		}
+	}
+	return err;
+}
+
+static unsigned sdma_v5_2_ring_init_cond_exec(struct amdgpu_ring *ring)
+{
+	unsigned ret;
+
+	amdgpu_ring_write(ring, SDMA_PKT_HEADER_OP(SDMA_OP_COND_EXE));
+	amdgpu_ring_write(ring, lower_32_bits(ring->cond_exe_gpu_addr));
+	amdgpu_ring_write(ring, upper_32_bits(ring->cond_exe_gpu_addr));
+	amdgpu_ring_write(ring, 1);
+	ret = ring->wptr & ring->buf_mask;/* this is the offset we need patch later */
+	amdgpu_ring_write(ring, 0x55aa55aa);/* insert dummy here and patch it later */
+
+	return ret;
+}
+
+static void sdma_v5_2_ring_patch_cond_exec(struct amdgpu_ring *ring,
+					   unsigned offset)
+{
+	unsigned cur;
+
+	BUG_ON(offset > ring->buf_mask);
+	BUG_ON(ring->ring[offset] != 0x55aa55aa);
+
+	cur = (ring->wptr - 1) & ring->buf_mask;
+	if (cur > offset)
+		ring->ring[offset] = cur - offset;
+	else
+		ring->ring[offset] = (ring->buf_mask + 1) - offset + cur;
+}
+
+/**
+ * sdma_v5_2_ring_get_rptr - get the current read pointer
+ *
+ * @ring: amdgpu ring pointer
+ *
+ * Get the current rptr from the hardware (NAVI10+).
+ */
+static uint64_t sdma_v5_2_ring_get_rptr(struct amdgpu_ring *ring)
+{
+	u64 *rptr;
+
+	/* XXX check if swapping is necessary on BE */
+	rptr = ((u64 *)&ring->adev->wb.wb[ring->rptr_offs]);
+
+	DRM_DEBUG("rptr before shift == 0x%016llx\n", *rptr);
+	return ((*rptr) >> 2);
+}
+
+/**
+ * sdma_v5_2_ring_get_wptr - get the current write pointer
+ *
+ * @ring: amdgpu ring pointer
+ *
+ * Get the current wptr from the hardware (NAVI10+).
+ */
+static uint64_t sdma_v5_2_ring_get_wptr(struct amdgpu_ring *ring)
+{
+	struct amdgpu_device *adev = ring->adev;
+	u64 *wptr = NULL;
+	uint64_t local_wptr = 0;
+
+	if (ring->use_doorbell) {
+		/* XXX check if swapping is necessary on BE */
+		wptr = ((u64 *)&adev->wb.wb[ring->wptr_offs]);
+		DRM_DEBUG("wptr/doorbell before shift == 0x%016llx\n", *wptr);
+		*wptr = (*wptr) >> 2;
+		DRM_DEBUG("wptr/doorbell after shift == 0x%016llx\n", *wptr);
+	} else {
+		u32 lowbit, highbit;
+
+		wptr = &local_wptr;
+		lowbit = RREG32(sdma_v5_2_get_reg_offset(adev, ring->me, mmSDMA0_GFX_RB_WPTR)) >> 2;
+		highbit = RREG32(sdma_v5_2_get_reg_offset(adev, ring->me, mmSDMA0_GFX_RB_WPTR_HI)) >> 2;
+
+		DRM_DEBUG("wptr [%i]high== 0x%08x low==0x%08x\n",
+				ring->me, highbit, lowbit);
+		*wptr = highbit;
+		*wptr = (*wptr) << 32;
+		*wptr |= lowbit;
+	}
+
+	return *wptr;
+}
+
+/**
+ * sdma_v5_2_ring_set_wptr - commit the write pointer
+ *
+ * @ring: amdgpu ring pointer
+ *
+ * Write the wptr back to the hardware (NAVI10+).
+ */
+static void sdma_v5_2_ring_set_wptr(struct amdgpu_ring *ring)
+{
+	struct amdgpu_device *adev = ring->adev;
+
+	DRM_DEBUG("Setting write pointer\n");
+	if (ring->use_doorbell) {
+		DRM_DEBUG("Using doorbell -- "
+				"wptr_offs == 0x%08x "
+				"lower_32_bits(ring->wptr) << 2 == 0x%08x "
+				"upper_32_bits(ring->wptr) << 2 == 0x%08x\n",
+				ring->wptr_offs,
+				lower_32_bits(ring->wptr << 2),
+				upper_32_bits(ring->wptr << 2));
+		/* XXX check if swapping is necessary on BE */
+		adev->wb.wb[ring->wptr_offs] = lower_32_bits(ring->wptr << 2);
+		adev->wb.wb[ring->wptr_offs + 1] = upper_32_bits(ring->wptr << 2);
+		DRM_DEBUG("calling WDOORBELL64(0x%08x, 0x%016llx)\n",
+				ring->doorbell_index, ring->wptr << 2);
+		WDOORBELL64(ring->doorbell_index, ring->wptr << 2);
+	} else {
+		DRM_DEBUG("Not using doorbell -- "
+				"mmSDMA%i_GFX_RB_WPTR == 0x%08x "
+				"mmSDMA%i_GFX_RB_WPTR_HI == 0x%08x\n",
+				ring->me,
+				lower_32_bits(ring->wptr << 2),
+				ring->me,
+				upper_32_bits(ring->wptr << 2));
+		WREG32(sdma_v5_2_get_reg_offset(adev, ring->me, mmSDMA0_GFX_RB_WPTR),
+			lower_32_bits(ring->wptr << 2));
+		WREG32(sdma_v5_2_get_reg_offset(adev, ring->me, mmSDMA0_GFX_RB_WPTR_HI),
+			upper_32_bits(ring->wptr << 2));
+	}
+}
+
+static void sdma_v5_2_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count)
+{
+	struct amdgpu_sdma_instance *sdma = amdgpu_sdma_get_instance_from_ring(ring);
+	int i;
+
+	for (i = 0; i < count; i++)
+		if (sdma && sdma->burst_nop && (i == 0))
+			amdgpu_ring_write(ring, ring->funcs->nop |
+				SDMA_PKT_NOP_HEADER_COUNT(count - 1));
+		else
+			amdgpu_ring_write(ring, ring->funcs->nop);
+}
+
+/**
+ * sdma_v5_2_ring_emit_ib - Schedule an IB on the DMA engine
+ *
+ * @ring: amdgpu ring pointer
+ * @ib: IB object to schedule
+ *
+ * Schedule an IB in the DMA ring.
+ */
+static void sdma_v5_2_ring_emit_ib(struct amdgpu_ring *ring,
+				   struct amdgpu_job *job,
+				   struct amdgpu_ib *ib,
+				   uint32_t flags)
+{
+	unsigned vmid = AMDGPU_JOB_GET_VMID(job);
+	uint64_t csa_mc_addr = amdgpu_sdma_get_csa_mc_addr(ring, vmid);
+
+	/* An IB packet must end on a 8 DW boundary--the next dword
+	 * must be on a 8-dword boundary. Our IB packet below is 6
+	 * dwords long, thus add x number of NOPs, such that, in
+	 * modular arithmetic,
+	 * wptr + 6 + x = 8k, k >= 0, which in C is,
+	 * (wptr + 6 + x) % 8 = 0.
+	 * The expression below, is a solution of x.
+	 */
+	sdma_v5_2_ring_insert_nop(ring, (2 - lower_32_bits(ring->wptr)) & 7);
+
+	amdgpu_ring_write(ring, SDMA_PKT_HEADER_OP(SDMA_OP_INDIRECT) |
+			  SDMA_PKT_INDIRECT_HEADER_VMID(vmid & 0xf));
+	/* base must be 32 byte aligned */
+	amdgpu_ring_write(ring, lower_32_bits(ib->gpu_addr) & 0xffffffe0);
+	amdgpu_ring_write(ring, upper_32_bits(ib->gpu_addr));
+	amdgpu_ring_write(ring, ib->length_dw);
+	amdgpu_ring_write(ring, lower_32_bits(csa_mc_addr));
+	amdgpu_ring_write(ring, upper_32_bits(csa_mc_addr));
+}
+
+/**
+ * sdma_v5_2_ring_emit_hdp_flush - emit an hdp flush on the DMA ring
+ *
+ * @ring: amdgpu ring pointer
+ *
+ * Emit an hdp flush packet on the requested DMA ring.
+ */
+static void sdma_v5_2_ring_emit_hdp_flush(struct amdgpu_ring *ring)
+{
+	struct amdgpu_device *adev = ring->adev;
+	u32 ref_and_mask = 0;
+	const struct nbio_hdp_flush_reg *nbio_hf_reg = adev->nbio.hdp_flush_reg;
+
+	if (ring->me == 0)
+		ref_and_mask = nbio_hf_reg->ref_and_mask_sdma0;
+	else
+		ref_and_mask = nbio_hf_reg->ref_and_mask_sdma1;
+
+	amdgpu_ring_write(ring, SDMA_PKT_HEADER_OP(SDMA_OP_POLL_REGMEM) |
+			  SDMA_PKT_POLL_REGMEM_HEADER_HDP_FLUSH(1) |
+			  SDMA_PKT_POLL_REGMEM_HEADER_FUNC(3)); /* == */
+	amdgpu_ring_write(ring, (adev->nbio.funcs->get_hdp_flush_done_offset(adev)) << 2);
+	amdgpu_ring_write(ring, (adev->nbio.funcs->get_hdp_flush_req_offset(adev)) << 2);
+	amdgpu_ring_write(ring, ref_and_mask); /* reference */
+	amdgpu_ring_write(ring, ref_and_mask); /* mask */
+	amdgpu_ring_write(ring, SDMA_PKT_POLL_REGMEM_DW5_RETRY_COUNT(0xfff) |
+			  SDMA_PKT_POLL_REGMEM_DW5_INTERVAL(10)); /* retry count, poll interval */
+}
+
+/**
+ * sdma_v5_2_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.
+ */
+static void sdma_v5_2_ring_emit_fence(struct amdgpu_ring *ring, u64 addr, u64 seq,
+				      unsigned flags)
+{
+	struct amdgpu_device *adev = ring->adev;
+	bool write64bit = flags & AMDGPU_FENCE_FLAG_64BIT;
+	/* write the fence */
+	amdgpu_ring_write(ring, SDMA_PKT_HEADER_OP(SDMA_OP_FENCE) |
+			  SDMA_PKT_FENCE_HEADER_MTYPE(0x3)); /* Ucached(UC) */
+	/* zero in first two bits */
+	BUG_ON(addr & 0x3);
+	amdgpu_ring_write(ring, lower_32_bits(addr));
+	amdgpu_ring_write(ring, upper_32_bits(addr));
+	amdgpu_ring_write(ring, lower_32_bits(seq));
+
+	/* optionally write high bits as well */
+	if (write64bit) {
+		addr += 4;
+		amdgpu_ring_write(ring, SDMA_PKT_HEADER_OP(SDMA_OP_FENCE) |
+				  SDMA_PKT_FENCE_HEADER_MTYPE(0x3));
+		/* zero in first two bits */
+		BUG_ON(addr & 0x3);
+		amdgpu_ring_write(ring, lower_32_bits(addr));
+		amdgpu_ring_write(ring, upper_32_bits(addr));
+		amdgpu_ring_write(ring, upper_32_bits(seq));
+	}
+
+	/* Interrupt not work fine on GFX10.1 model yet. Use fallback instead */
+	if ((flags & AMDGPU_FENCE_FLAG_INT) && adev->pdev->device != 0x50) {
+		/* generate an interrupt */
+		amdgpu_ring_write(ring, SDMA_PKT_HEADER_OP(SDMA_OP_TRAP));
+		amdgpu_ring_write(ring, SDMA_PKT_TRAP_INT_CONTEXT_INT_CONTEXT(0));
+	}
+}
+
+
+/**
+ * sdma_v5_2_gfx_stop - stop the gfx async dma engines
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Stop the gfx async dma ring buffers.
+ */
+static void sdma_v5_2_gfx_stop(struct amdgpu_device *adev)
+{
+	struct amdgpu_ring *sdma0 = &adev->sdma.instance[0].ring;
+	struct amdgpu_ring *sdma1 = &adev->sdma.instance[1].ring;
+	struct amdgpu_ring *sdma2 = &adev->sdma.instance[2].ring;
+	struct amdgpu_ring *sdma3 = &adev->sdma.instance[3].ring;
+	u32 rb_cntl, ib_cntl;
+	int i;
+
+	if ((adev->mman.buffer_funcs_ring == sdma0) ||
+	    (adev->mman.buffer_funcs_ring == sdma1) ||
+	    (adev->mman.buffer_funcs_ring == sdma2) ||
+	    (adev->mman.buffer_funcs_ring == sdma3))
+		amdgpu_ttm_set_buffer_funcs_status(adev, false);
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		rb_cntl = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_CNTL));
+		rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RB_ENABLE, 0);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_CNTL), rb_cntl);
+		ib_cntl = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_IB_CNTL));
+		ib_cntl = REG_SET_FIELD(ib_cntl, SDMA0_GFX_IB_CNTL, IB_ENABLE, 0);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_IB_CNTL), ib_cntl);
+	}
+
+	sdma0->sched.ready = false;
+	sdma1->sched.ready = false;
+	sdma2->sched.ready = false;
+	sdma3->sched.ready = false;
+}
+
+/**
+ * sdma_v5_2_rlc_stop - stop the compute async dma engines
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Stop the compute async dma queues.
+ */
+static void sdma_v5_2_rlc_stop(struct amdgpu_device *adev)
+{
+	/* XXX todo */
+}
+
+/**
+ * sdma_v_0_ctx_switch_enable - stop the async dma engines context switch
+ *
+ * @adev: amdgpu_device pointer
+ * @enable: enable/disable the DMA MEs context switch.
+ *
+ * Halt or unhalt the async dma engines context switch.
+ */
+static void sdma_v5_2_ctx_switch_enable(struct amdgpu_device *adev, bool enable)
+{
+	u32 f32_cntl, phase_quantum = 0;
+	int i;
+
+	if (amdgpu_sdma_phase_quantum) {
+		unsigned value = amdgpu_sdma_phase_quantum;
+		unsigned unit = 0;
+
+		while (value > (SDMA0_PHASE0_QUANTUM__VALUE_MASK >>
+				SDMA0_PHASE0_QUANTUM__VALUE__SHIFT)) {
+			value = (value + 1) >> 1;
+			unit++;
+		}
+		if (unit > (SDMA0_PHASE0_QUANTUM__UNIT_MASK >>
+			    SDMA0_PHASE0_QUANTUM__UNIT__SHIFT)) {
+			value = (SDMA0_PHASE0_QUANTUM__VALUE_MASK >>
+				 SDMA0_PHASE0_QUANTUM__VALUE__SHIFT);
+			unit = (SDMA0_PHASE0_QUANTUM__UNIT_MASK >>
+				SDMA0_PHASE0_QUANTUM__UNIT__SHIFT);
+			WARN_ONCE(1,
+			"clamping sdma_phase_quantum to %uK clock cycles\n",
+				  value << unit);
+		}
+		phase_quantum =
+			value << SDMA0_PHASE0_QUANTUM__VALUE__SHIFT |
+			unit  << SDMA0_PHASE0_QUANTUM__UNIT__SHIFT;
+	}
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		f32_cntl = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_CNTL));
+		f32_cntl = REG_SET_FIELD(f32_cntl, SDMA0_CNTL,
+				AUTO_CTXSW_ENABLE, enable ? 1 : 0);
+		if (enable && amdgpu_sdma_phase_quantum) {
+			WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_PHASE0_QUANTUM),
+			       phase_quantum);
+			WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_PHASE1_QUANTUM),
+			       phase_quantum);
+			WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_PHASE2_QUANTUM),
+			       phase_quantum);
+		}
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_CNTL), f32_cntl);
+	}
+
+}
+
+/**
+ * sdma_v5_2_enable - stop the async dma engines
+ *
+ * @adev: amdgpu_device pointer
+ * @enable: enable/disable the DMA MEs.
+ *
+ * Halt or unhalt the async dma engines.
+ */
+static void sdma_v5_2_enable(struct amdgpu_device *adev, bool enable)
+{
+	u32 f32_cntl;
+	int i;
+
+	if (enable == false) {
+		sdma_v5_2_gfx_stop(adev);
+		sdma_v5_2_rlc_stop(adev);
+	}
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		f32_cntl = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_F32_CNTL));
+		f32_cntl = REG_SET_FIELD(f32_cntl, SDMA0_F32_CNTL, HALT, enable ? 0 : 1);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_F32_CNTL), f32_cntl);
+	}
+}
+
+/**
+ * sdma_v5_2_gfx_resume - setup and start the async dma engines
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Set up the gfx DMA ring buffers and enable them.
+ * Returns 0 for success, error for failure.
+ */
+static int sdma_v5_2_gfx_resume(struct amdgpu_device *adev)
+{
+	struct amdgpu_ring *ring;
+	u32 rb_cntl, ib_cntl;
+	u32 rb_bufsz;
+	u32 wb_offset;
+	u32 doorbell;
+	u32 doorbell_offset;
+	u32 temp;
+	u32 wptr_poll_cntl;
+	u64 wptr_gpu_addr;
+	int i, r;
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		ring = &adev->sdma.instance[i].ring;
+		wb_offset = (ring->rptr_offs * 4);
+
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_SEM_WAIT_FAIL_TIMER_CNTL), 0);
+
+		/* Set ring buffer size in dwords */
+		rb_bufsz = order_base_2(ring->ring_size / 4);
+		rb_cntl = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_CNTL));
+		rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RB_SIZE, rb_bufsz);
+#ifdef __BIG_ENDIAN
+		rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RB_SWAP_ENABLE, 1);
+		rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL,
+					RPTR_WRITEBACK_SWAP_ENABLE, 1);
+#endif
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_CNTL), rb_cntl);
+
+		/* Initialize the ring buffer's read and write pointers */
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_RPTR), 0);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_RPTR_HI), 0);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_WPTR), 0);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_WPTR_HI), 0);
+
+		/* setup the wptr shadow polling */
+		wptr_gpu_addr = adev->wb.gpu_addr + (ring->wptr_offs * 4);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_WPTR_POLL_ADDR_LO),
+		       lower_32_bits(wptr_gpu_addr));
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_WPTR_POLL_ADDR_HI),
+		       upper_32_bits(wptr_gpu_addr));
+		wptr_poll_cntl = RREG32(sdma_v5_2_get_reg_offset(adev, i,
+							 mmSDMA0_GFX_RB_WPTR_POLL_CNTL));
+		wptr_poll_cntl = REG_SET_FIELD(wptr_poll_cntl,
+					       SDMA0_GFX_RB_WPTR_POLL_CNTL,
+					       F32_POLL_ENABLE, 1);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_WPTR_POLL_CNTL),
+		       wptr_poll_cntl);
+
+		/* set the wb address whether it's enabled or not */
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_RPTR_ADDR_HI),
+		       upper_32_bits(adev->wb.gpu_addr + wb_offset) & 0xFFFFFFFF);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_RPTR_ADDR_LO),
+		       lower_32_bits(adev->wb.gpu_addr + wb_offset) & 0xFFFFFFFC);
+
+		rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RPTR_WRITEBACK_ENABLE, 1);
+
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_BASE), ring->gpu_addr >> 8);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_BASE_HI), ring->gpu_addr >> 40);
+
+		ring->wptr = 0;
+
+		/* before programing wptr to a less value, need set minor_ptr_update first */
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_MINOR_PTR_UPDATE), 1);
+
+		if (!amdgpu_sriov_vf(adev)) { /* only bare-metal use register write for wptr */
+			WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_WPTR), lower_32_bits(ring->wptr) << 2);
+			WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_WPTR_HI), upper_32_bits(ring->wptr) << 2);
+		}
+
+		doorbell = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_DOORBELL));
+		doorbell_offset = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_DOORBELL_OFFSET));
+
+		if (ring->use_doorbell) {
+			doorbell = REG_SET_FIELD(doorbell, SDMA0_GFX_DOORBELL, ENABLE, 1);
+			doorbell_offset = REG_SET_FIELD(doorbell_offset, SDMA0_GFX_DOORBELL_OFFSET,
+					OFFSET, ring->doorbell_index);
+		} else {
+			doorbell = REG_SET_FIELD(doorbell, SDMA0_GFX_DOORBELL, ENABLE, 0);
+		}
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_DOORBELL), doorbell);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_DOORBELL_OFFSET), doorbell_offset);
+
+		adev->nbio.funcs->sdma_doorbell_range(adev, i, ring->use_doorbell,
+						      ring->doorbell_index, 20);
+
+		if (amdgpu_sriov_vf(adev))
+			sdma_v5_2_ring_set_wptr(ring);
+
+		/* set minor_ptr_update to 0 after wptr programed */
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_MINOR_PTR_UPDATE), 0);
+
+		/* set utc l1 enable flag always to 1 */
+		temp = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_CNTL));
+		temp = REG_SET_FIELD(temp, SDMA0_CNTL, UTC_L1_ENABLE, 1);
+
+		/* enable MCBP */
+		temp = REG_SET_FIELD(temp, SDMA0_CNTL, MIDCMD_PREEMPT_ENABLE, 1);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_CNTL), temp);
+
+		/* Set up RESP_MODE to non-copy addresses */
+		temp = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_UTCL1_CNTL));
+		temp = REG_SET_FIELD(temp, SDMA0_UTCL1_CNTL, RESP_MODE, 3);
+		temp = REG_SET_FIELD(temp, SDMA0_UTCL1_CNTL, REDO_DELAY, 9);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_UTCL1_CNTL), temp);
+
+		/* program default cache read and write policy */
+		temp = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_UTCL1_PAGE));
+		/* clean read policy and write policy bits */
+		temp &= 0xFF0FFF;
+		temp |= ((CACHE_READ_POLICY_L2__DEFAULT << 12) |
+			 (CACHE_WRITE_POLICY_L2__DEFAULT << 14) |
+			 0x01000000);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_UTCL1_PAGE), temp);
+
+		if (!amdgpu_sriov_vf(adev)) {
+			/* unhalt engine */
+			temp = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_F32_CNTL));
+			temp = REG_SET_FIELD(temp, SDMA0_F32_CNTL, HALT, 0);
+			WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_F32_CNTL), temp);
+		}
+
+		/* enable DMA RB */
+		rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RB_ENABLE, 1);
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_CNTL), rb_cntl);
+
+		ib_cntl = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_IB_CNTL));
+		ib_cntl = REG_SET_FIELD(ib_cntl, SDMA0_GFX_IB_CNTL, IB_ENABLE, 1);
+#ifdef __BIG_ENDIAN
+		ib_cntl = REG_SET_FIELD(ib_cntl, SDMA0_GFX_IB_CNTL, IB_SWAP_ENABLE, 1);
+#endif
+		/* enable DMA IBs */
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_IB_CNTL), ib_cntl);
+
+		ring->sched.ready = true;
+
+		if (amdgpu_sriov_vf(adev)) { /* bare-metal sequence doesn't need below to lines */
+			sdma_v5_2_ctx_switch_enable(adev, true);
+			sdma_v5_2_enable(adev, true);
+		}
+
+		r = amdgpu_ring_test_ring(ring);
+		if (r) {
+			ring->sched.ready = false;
+			return r;
+		}
+
+		if (adev->mman.buffer_funcs_ring == ring)
+			amdgpu_ttm_set_buffer_funcs_status(adev, true);
+	}
+
+	return 0;
+}
+
+/**
+ * sdma_v5_2_rlc_resume - setup and start the async dma engines
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Set up the compute DMA queues and enable them.
+ * Returns 0 for success, error for failure.
+ */
+static int sdma_v5_2_rlc_resume(struct amdgpu_device *adev)
+{
+	return 0;
+}
+
+/**
+ * sdma_v5_2_load_microcode - load the sDMA ME ucode
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Loads the sDMA0/1/2/3 ucode.
+ * Returns 0 for success, -EINVAL if the ucode is not available.
+ */
+static int sdma_v5_2_load_microcode(struct amdgpu_device *adev)
+{
+	const struct sdma_firmware_header_v1_0 *hdr;
+	const __le32 *fw_data;
+	u32 fw_size;
+	int i, j;
+
+	/* halt the MEs */
+	sdma_v5_2_enable(adev, false);
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		if (!adev->sdma.instance[i].fw)
+			return -EINVAL;
+
+		hdr = (const struct sdma_firmware_header_v1_0 *)adev->sdma.instance[i].fw->data;
+		amdgpu_ucode_print_sdma_hdr(&hdr->header);
+		fw_size = le32_to_cpu(hdr->header.ucode_size_bytes) / 4;
+
+		fw_data = (const __le32 *)
+			(adev->sdma.instance[i].fw->data +
+				le32_to_cpu(hdr->header.ucode_array_offset_bytes));
+
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_UCODE_ADDR), 0);
+
+		for (j = 0; j < fw_size; j++) {
+			if (amdgpu_emu_mode == 1 && j % 500 == 0)
+				msleep(1);
+			WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_UCODE_DATA), le32_to_cpup(fw_data++));
+		}
+
+		WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_UCODE_ADDR), adev->sdma.instance[i].fw_version);
+	}
+
+	return 0;
+}
+
+/**
+ * sdma_v5_2_start - setup and start the async dma engines
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Set up the DMA engines and enable them.
+ * Returns 0 for success, error for failure.
+ */
+static int sdma_v5_2_start(struct amdgpu_device *adev)
+{
+	int r = 0;
+
+	if (amdgpu_sriov_vf(adev)) {
+		sdma_v5_2_ctx_switch_enable(adev, false);
+		sdma_v5_2_enable(adev, false);
+
+		/* set RB registers */
+		r = sdma_v5_2_gfx_resume(adev);
+		return r;
+	}
+
+	if (adev->firmware.load_type == AMDGPU_FW_LOAD_DIRECT) {
+		r = sdma_v5_2_load_microcode(adev);
+		if (r)
+			return r;
+
+		/* The value of mmSDMA_F32_CNTL is invalid the moment after loading fw */
+		if (amdgpu_emu_mode == 1)
+			msleep(1000);
+	}
+
+	/* unhalt the MEs */
+	sdma_v5_2_enable(adev, true);
+	/* enable sdma ring preemption */
+	sdma_v5_2_ctx_switch_enable(adev, true);
+
+	/* start the gfx rings and rlc compute queues */
+	r = sdma_v5_2_gfx_resume(adev);
+	if (r)
+		return r;
+	r = sdma_v5_2_rlc_resume(adev);
+
+	return r;
+}
+
+/**
+ * sdma_v5_2_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.
+ * Returns 0 for success, error for failure.
+ */
+static int sdma_v5_2_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_device_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, 5);
+	if (r) {
+		DRM_ERROR("amdgpu: dma failed to lock ring %d (%d).\n", ring->idx, r);
+		amdgpu_device_wb_free(adev, index);
+		return r;
+	}
+
+	amdgpu_ring_write(ring, SDMA_PKT_HEADER_OP(SDMA_OP_WRITE) |
+			  SDMA_PKT_HEADER_SUB_OP(SDMA_SUBOP_WRITE_LINEAR));
+	amdgpu_ring_write(ring, lower_32_bits(gpu_addr));
+	amdgpu_ring_write(ring, upper_32_bits(gpu_addr));
+	amdgpu_ring_write(ring, SDMA_PKT_WRITE_UNTILED_DW_3_COUNT(0));
+	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;
+		if (amdgpu_emu_mode == 1)
+			msleep(1);
+		else
+			udelay(1);
+	}
+
+	if (i >= adev->usec_timeout)
+		r = -ETIMEDOUT;
+
+	amdgpu_device_wb_free(adev, index);
+
+	return r;
+}
+
+/**
+ * sdma_v5_2_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.
+ * Returns 0 on success, error on failure.
+ */
+static int sdma_v5_2_ring_test_ib(struct amdgpu_ring *ring, long timeout)
+{
+	struct amdgpu_device *adev = ring->adev;
+	struct amdgpu_ib ib;
+	struct dma_fence *f = NULL;
+	unsigned index;
+	long r;
+	u32 tmp = 0;
+	u64 gpu_addr;
+
+	r = amdgpu_device_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, AMDGPU_IB_POOL_DIRECT, &ib);
+	if (r) {
+		DRM_ERROR("amdgpu: failed to get ib (%ld).\n", r);
+		goto err0;
+	}
+
+	ib.ptr[0] = SDMA_PKT_HEADER_OP(SDMA_OP_WRITE) |
+		SDMA_PKT_HEADER_SUB_OP(SDMA_SUBOP_WRITE_LINEAR);
+	ib.ptr[1] = lower_32_bits(gpu_addr);
+	ib.ptr[2] = upper_32_bits(gpu_addr);
+	ib.ptr[3] = SDMA_PKT_WRITE_UNTILED_DW_3_COUNT(0);
+	ib.ptr[4] = 0xDEADBEEF;
+	ib.ptr[5] = SDMA_PKT_NOP_HEADER_OP(SDMA_OP_NOP);
+	ib.ptr[6] = SDMA_PKT_NOP_HEADER_OP(SDMA_OP_NOP);
+	ib.ptr[7] = SDMA_PKT_NOP_HEADER_OP(SDMA_OP_NOP);
+	ib.length_dw = 8;
+
+	r = amdgpu_ib_schedule(ring, 1, &ib, NULL, &f);
+	if (r)
+		goto err1;
+
+	r = dma_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)
+		r = 0;
+	else
+		r = -EINVAL;
+
+err1:
+	amdgpu_ib_free(adev, &ib, NULL);
+	dma_fence_put(f);
+err0:
+	amdgpu_device_wb_free(adev, index);
+	return r;
+}
+
+
+/**
+ * sdma_v5_2_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 sDMA.
+ */
+static void sdma_v5_2_vm_copy_pte(struct amdgpu_ib *ib,
+				  uint64_t pe, uint64_t src,
+				  unsigned count)
+{
+	unsigned bytes = count * 8;
+
+	ib->ptr[ib->length_dw++] = SDMA_PKT_HEADER_OP(SDMA_OP_COPY) |
+		SDMA_PKT_HEADER_SUB_OP(SDMA_SUBOP_COPY_LINEAR);
+	ib->ptr[ib->length_dw++] = bytes - 1;
+	ib->ptr[ib->length_dw++] = 0; /* src/dst endian swap */
+	ib->ptr[ib->length_dw++] = lower_32_bits(src);
+	ib->ptr[ib->length_dw++] = upper_32_bits(src);
+	ib->ptr[ib->length_dw++] = lower_32_bits(pe);
+	ib->ptr[ib->length_dw++] = upper_32_bits(pe);
+
+}
+
+/**
+ * sdma_v5_2_vm_write_pte - update PTEs by writing them manually
+ *
+ * @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 PTEs by writing them manually using sDMA.
+ */
+static void sdma_v5_2_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++] = SDMA_PKT_HEADER_OP(SDMA_OP_WRITE) |
+		SDMA_PKT_HEADER_SUB_OP(SDMA_SUBOP_WRITE_LINEAR);
+	ib->ptr[ib->length_dw++] = lower_32_bits(pe);
+	ib->ptr[ib->length_dw++] = upper_32_bits(pe);
+	ib->ptr[ib->length_dw++] = ndw - 1;
+	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;
+	}
+}
+
+/**
+ * sdma_v5_2_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.
+ */
+static void sdma_v5_2_vm_set_pte_pde(struct amdgpu_ib *ib,
+				     uint64_t pe,
+				     uint64_t addr, unsigned count,
+				     uint32_t incr, uint64_t flags)
+{
+	/* for physically contiguous pages (vram) */
+	ib->ptr[ib->length_dw++] = SDMA_PKT_HEADER_OP(SDMA_OP_PTEPDE);
+	ib->ptr[ib->length_dw++] = lower_32_bits(pe); /* dst addr */
+	ib->ptr[ib->length_dw++] = upper_32_bits(pe);
+	ib->ptr[ib->length_dw++] = lower_32_bits(flags); /* mask */
+	ib->ptr[ib->length_dw++] = upper_32_bits(flags);
+	ib->ptr[ib->length_dw++] = lower_32_bits(addr); /* value */
+	ib->ptr[ib->length_dw++] = upper_32_bits(addr);
+	ib->ptr[ib->length_dw++] = incr; /* increment size */
+	ib->ptr[ib->length_dw++] = 0;
+	ib->ptr[ib->length_dw++] = count - 1; /* number of entries */
+}
+
+/**
+ * sdma_v5_2_ring_pad_ib - pad the IB
+ *
+ * @ib: indirect buffer to fill with padding
+ *
+ * Pad the IB with NOPs to a boundary multiple of 8.
+ */
+static void sdma_v5_2_ring_pad_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib)
+{
+	struct amdgpu_sdma_instance *sdma = amdgpu_sdma_get_instance_from_ring(ring);
+	u32 pad_count;
+	int i;
+
+	pad_count = (-ib->length_dw) & 0x7;
+	for (i = 0; i < pad_count; i++)
+		if (sdma && sdma->burst_nop && (i == 0))
+			ib->ptr[ib->length_dw++] =
+				SDMA_PKT_HEADER_OP(SDMA_OP_NOP) |
+				SDMA_PKT_NOP_HEADER_COUNT(pad_count - 1);
+		else
+			ib->ptr[ib->length_dw++] =
+				SDMA_PKT_HEADER_OP(SDMA_OP_NOP);
+}
+
+
+/**
+ * sdma_v5_2_ring_emit_pipeline_sync - sync the pipeline
+ *
+ * @ring: amdgpu_ring pointer
+ *
+ * Make sure all previous operations are completed (CIK).
+ */
+static void sdma_v5_2_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, SDMA_PKT_HEADER_OP(SDMA_OP_POLL_REGMEM) |
+			  SDMA_PKT_POLL_REGMEM_HEADER_HDP_FLUSH(0) |
+			  SDMA_PKT_POLL_REGMEM_HEADER_FUNC(3) | /* equal */
+			  SDMA_PKT_POLL_REGMEM_HEADER_MEM_POLL(1));
+	amdgpu_ring_write(ring, addr & 0xfffffffc);
+	amdgpu_ring_write(ring, upper_32_bits(addr) & 0xffffffff);
+	amdgpu_ring_write(ring, seq); /* reference */
+	amdgpu_ring_write(ring, 0xffffffff); /* mask */
+	amdgpu_ring_write(ring, SDMA_PKT_POLL_REGMEM_DW5_RETRY_COUNT(0xfff) |
+			  SDMA_PKT_POLL_REGMEM_DW5_INTERVAL(4)); /* retry count, poll interval */
+}
+
+
+/**
+ * sdma_v5_2_ring_emit_vm_flush - vm flush using sDMA
+ *
+ * @ring: amdgpu_ring pointer
+ * @vm: amdgpu_vm pointer
+ *
+ * Update the page table base and flush the VM TLB
+ * using sDMA.
+ */
+static void sdma_v5_2_ring_emit_vm_flush(struct amdgpu_ring *ring,
+					 unsigned vmid, uint64_t pd_addr)
+{
+	amdgpu_gmc_emit_flush_gpu_tlb(ring, vmid, pd_addr);
+}
+
+static void sdma_v5_2_ring_emit_wreg(struct amdgpu_ring *ring,
+				     uint32_t reg, uint32_t val)
+{
+	amdgpu_ring_write(ring, SDMA_PKT_HEADER_OP(SDMA_OP_SRBM_WRITE) |
+			  SDMA_PKT_SRBM_WRITE_HEADER_BYTE_EN(0xf));
+	amdgpu_ring_write(ring, reg);
+	amdgpu_ring_write(ring, val);
+}
+
+static void sdma_v5_2_ring_emit_reg_wait(struct amdgpu_ring *ring, uint32_t reg,
+					 uint32_t val, uint32_t mask)
+{
+	amdgpu_ring_write(ring, SDMA_PKT_HEADER_OP(SDMA_OP_POLL_REGMEM) |
+			  SDMA_PKT_POLL_REGMEM_HEADER_HDP_FLUSH(0) |
+			  SDMA_PKT_POLL_REGMEM_HEADER_FUNC(3)); /* equal */
+	amdgpu_ring_write(ring, reg << 2);
+	amdgpu_ring_write(ring, 0);
+	amdgpu_ring_write(ring, val); /* reference */
+	amdgpu_ring_write(ring, mask); /* mask */
+	amdgpu_ring_write(ring, SDMA_PKT_POLL_REGMEM_DW5_RETRY_COUNT(0xfff) |
+			  SDMA_PKT_POLL_REGMEM_DW5_INTERVAL(10));
+}
+
+static void sdma_v5_2_ring_emit_reg_write_reg_wait(struct amdgpu_ring *ring,
+						   uint32_t reg0, uint32_t reg1,
+						   uint32_t ref, uint32_t mask)
+{
+	amdgpu_ring_emit_wreg(ring, reg0, ref);
+	/* wait for a cycle to reset vm_inv_eng*_ack */
+	amdgpu_ring_emit_reg_wait(ring, reg0, 0, 0);
+	amdgpu_ring_emit_reg_wait(ring, reg1, mask, mask);
+}
+
+static int sdma_v5_2_early_init(void *handle)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	adev->sdma.num_instances = 4;
+
+	sdma_v5_2_set_ring_funcs(adev);
+	sdma_v5_2_set_buffer_funcs(adev);
+	sdma_v5_2_set_vm_pte_funcs(adev);
+	sdma_v5_2_set_irq_funcs(adev);
+
+	return 0;
+}
+
+static int sdma_v5_2_sw_init(void *handle)
+{
+	struct amdgpu_ring *ring;
+	int r, i;
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	/* SDMA trap event */
+	r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_SDMA0,
+			      SDMA0_5_0__SRCID__SDMA_TRAP,
+			      &adev->sdma.trap_irq);
+	if (r)
+		return r;
+
+	/* SDMA trap event */
+	r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_SDMA1,
+			      SDMA1_5_0__SRCID__SDMA_TRAP,
+			      &adev->sdma.trap_irq);
+	if (r)
+		return r;
+
+	/* SDMA trap event */
+	r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_SDMA2,
+			      SDMA2_5_0__SRCID__SDMA_TRAP,
+			      &adev->sdma.trap_irq);
+	if (r)
+		return r;
+
+	/* SDMA trap event */
+	r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_SDMA3,
+			      SDMA3_5_0__SRCID__SDMA_TRAP,
+			      &adev->sdma.trap_irq);
+	if (r)
+		return r;
+
+	r = sdma_v5_2_init_microcode(adev);
+	if (r) {
+		DRM_ERROR("Failed to load sdma firmware!\n");
+		return r;
+	}
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		ring = &adev->sdma.instance[i].ring;
+		ring->ring_obj = NULL;
+		ring->use_doorbell = true;
+
+		DRM_INFO("use_doorbell being set to: [%s]\n",
+				ring->use_doorbell?"true":"false");
+
+		ring->doorbell_index =
+			(adev->doorbell_index.sdma_engine[i] << 1); //get DWORD offset
+
+		sprintf(ring->name, "sdma%d", i);
+		r = amdgpu_ring_init(adev, ring, 1024,
+				     &adev->sdma.trap_irq,
+				     AMDGPU_SDMA_IRQ_INSTANCE0 + i,
+				     AMDGPU_RING_PRIO_DEFAULT);
+		if (r)
+			return r;
+	}
+
+	return r;
+}
+
+static int sdma_v5_2_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 sdma_v5_2_hw_init(void *handle)
+{
+	int r;
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	sdma_v5_2_init_golden_registers(adev);
+
+	r = sdma_v5_2_start(adev);
+
+	return r;
+}
+
+static int sdma_v5_2_hw_fini(void *handle)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	if (amdgpu_sriov_vf(adev))
+		return 0;
+
+	sdma_v5_2_ctx_switch_enable(adev, false);
+	sdma_v5_2_enable(adev, false);
+
+	return 0;
+}
+
+static int sdma_v5_2_suspend(void *handle)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	return sdma_v5_2_hw_fini(adev);
+}
+
+static int sdma_v5_2_resume(void *handle)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	return sdma_v5_2_hw_init(adev);
+}
+
+static bool sdma_v5_2_is_idle(void *handle)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+	u32 i;
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		u32 tmp = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_STATUS_REG));
+
+		if (!(tmp & SDMA0_STATUS_REG__IDLE_MASK))
+			return false;
+	}
+
+	return true;
+}
+
+static int sdma_v5_2_wait_for_idle(void *handle)
+{
+	unsigned i;
+	u32 sdma0, sdma1, sdma2, sdma3;
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	for (i = 0; i < adev->usec_timeout; i++) {
+		sdma0 = RREG32(sdma_v5_2_get_reg_offset(adev, 0, mmSDMA0_STATUS_REG));
+		sdma1 = RREG32(sdma_v5_2_get_reg_offset(adev, 1, mmSDMA0_STATUS_REG));
+		sdma2 = RREG32(sdma_v5_2_get_reg_offset(adev, 2, mmSDMA0_STATUS_REG));
+		sdma3 = RREG32(sdma_v5_2_get_reg_offset(adev, 3, mmSDMA0_STATUS_REG));
+
+		if (sdma0 & sdma1 & sdma2 & sdma3 & SDMA0_STATUS_REG__IDLE_MASK)
+			return 0;
+		udelay(1);
+	}
+	return -ETIMEDOUT;
+}
+
+static int sdma_v5_2_soft_reset(void *handle)
+{
+	/* todo */
+
+	return 0;
+}
+
+static int sdma_v5_2_ring_preempt_ib(struct amdgpu_ring *ring)
+{
+	int i, r = 0;
+	struct amdgpu_device *adev = ring->adev;
+	u32 index = 0;
+	u64 sdma_gfx_preempt;
+
+	amdgpu_sdma_get_index_from_ring(ring, &index);
+	sdma_gfx_preempt =
+		sdma_v5_2_get_reg_offset(adev, index, mmSDMA0_GFX_PREEMPT);
+
+	/* assert preemption condition */
+	amdgpu_ring_set_preempt_cond_exec(ring, false);
+
+	/* emit the trailing fence */
+	ring->trail_seq += 1;
+	amdgpu_ring_alloc(ring, 10);
+	sdma_v5_2_ring_emit_fence(ring, ring->trail_fence_gpu_addr,
+				  ring->trail_seq, 0);
+	amdgpu_ring_commit(ring);
+
+	/* assert IB preemption */
+	WREG32(sdma_gfx_preempt, 1);
+
+	/* poll the trailing fence */
+	for (i = 0; i < adev->usec_timeout; i++) {
+		if (ring->trail_seq ==
+		    le32_to_cpu(*(ring->trail_fence_cpu_addr)))
+			break;
+		udelay(1);
+	}
+
+	if (i >= adev->usec_timeout) {
+		r = -EINVAL;
+		DRM_ERROR("ring %d failed to be preempted\n", ring->idx);
+	}
+
+	/* deassert IB preemption */
+	WREG32(sdma_gfx_preempt, 0);
+
+	/* deassert the preemption condition */
+	amdgpu_ring_set_preempt_cond_exec(ring, true);
+	return r;
+}
+
+static int sdma_v5_2_set_trap_irq_state(struct amdgpu_device *adev,
+					struct amdgpu_irq_src *source,
+					unsigned type,
+					enum amdgpu_interrupt_state state)
+{
+	u32 sdma_cntl;
+
+	u32 reg_offset = sdma_v5_2_get_reg_offset(adev, type, mmSDMA0_CNTL);
+
+	sdma_cntl = RREG32(reg_offset);
+	sdma_cntl = REG_SET_FIELD(sdma_cntl, SDMA0_CNTL, TRAP_ENABLE,
+		       state == AMDGPU_IRQ_STATE_ENABLE ? 1 : 0);
+	WREG32(reg_offset, sdma_cntl);
+
+	return 0;
+}
+
+static int sdma_v5_2_process_trap_irq(struct amdgpu_device *adev,
+				      struct amdgpu_irq_src *source,
+				      struct amdgpu_iv_entry *entry)
+{
+	DRM_DEBUG("IH: SDMA trap\n");
+	switch (entry->client_id) {
+	case SOC15_IH_CLIENTID_SDMA0:
+		switch (entry->ring_id) {
+		case 0:
+			amdgpu_fence_process(&adev->sdma.instance[0].ring);
+			break;
+		case 1:
+			/* XXX compute */
+			break;
+		case 2:
+			/* XXX compute */
+			break;
+		case 3:
+			/* XXX page queue*/
+			break;
+		}
+		break;
+	case SOC15_IH_CLIENTID_SDMA1:
+		switch (entry->ring_id) {
+		case 0:
+			amdgpu_fence_process(&adev->sdma.instance[1].ring);
+			break;
+		case 1:
+			/* XXX compute */
+			break;
+		case 2:
+			/* XXX compute */
+			break;
+		case 3:
+			/* XXX page queue*/
+			break;
+		}
+		break;
+	case SOC15_IH_CLIENTID_SDMA2:
+		switch (entry->ring_id) {
+		case 0:
+			amdgpu_fence_process(&adev->sdma.instance[2].ring);
+			break;
+		case 1:
+			/* XXX compute */
+			break;
+		case 2:
+			/* XXX compute */
+			break;
+		case 3:
+			/* XXX page queue*/
+			break;
+		}
+		break;
+	case SOC15_IH_CLIENTID_SDMA3:
+		switch (entry->ring_id) {
+		case 0:
+			amdgpu_fence_process(&adev->sdma.instance[3].ring);
+			break;
+		case 1:
+			/* XXX compute */
+			break;
+		case 2:
+			/* XXX compute */
+			break;
+		case 3:
+			/* XXX page queue*/
+			break;
+		}
+		break;
+	}
+	return 0;
+}
+
+static int sdma_v5_2_process_illegal_inst_irq(struct amdgpu_device *adev,
+					      struct amdgpu_irq_src *source,
+					      struct amdgpu_iv_entry *entry)
+{
+	return 0;
+}
+
+static void sdma_v5_2_update_medium_grain_clock_gating(struct amdgpu_device *adev,
+						       bool enable)
+{
+	uint32_t data, def;
+	int i;
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		if (enable && (adev->cg_flags & AMD_CG_SUPPORT_SDMA_MGCG)) {
+			/* Enable sdma clock gating */
+			def = data = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_CLK_CTRL));
+			data &= ~(SDMA0_CLK_CTRL__SOFT_OVERRIDE4_MASK |
+				  SDMA0_CLK_CTRL__SOFT_OVERRIDE3_MASK |
+				  SDMA0_CLK_CTRL__SOFT_OVERRIDE2_MASK |
+				  SDMA0_CLK_CTRL__SOFT_OVERRIDE1_MASK |
+				  SDMA0_CLK_CTRL__SOFT_OVERRIDE0_MASK |
+				  SDMA0_CLK_CTRL__SOFT_OVERRIDER_REG_MASK);
+			if (def != data)
+				WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_CLK_CTRL), data);
+		} else {
+			/* Disable sdma clock gating */
+			def = data = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_CLK_CTRL));
+			data |= (SDMA0_CLK_CTRL__SOFT_OVERRIDE4_MASK |
+				 SDMA0_CLK_CTRL__SOFT_OVERRIDE3_MASK |
+				 SDMA0_CLK_CTRL__SOFT_OVERRIDE2_MASK |
+				 SDMA0_CLK_CTRL__SOFT_OVERRIDE1_MASK |
+				 SDMA0_CLK_CTRL__SOFT_OVERRIDE0_MASK |
+				 SDMA0_CLK_CTRL__SOFT_OVERRIDER_REG_MASK);
+			if (def != data)
+				WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_CLK_CTRL), data);
+		}
+	}
+}
+
+static void sdma_v5_2_update_medium_grain_light_sleep(struct amdgpu_device *adev,
+						      bool enable)
+{
+	uint32_t data, def;
+	int i;
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		if (enable && (adev->cg_flags & AMD_CG_SUPPORT_SDMA_LS)) {
+			/* Enable sdma mem light sleep */
+			def = data = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_POWER_CNTL));
+			data |= SDMA0_POWER_CNTL__MEM_POWER_OVERRIDE_MASK;
+			if (def != data)
+				WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_POWER_CNTL), data);
+
+		} else {
+			/* Disable sdma mem light sleep */
+			def = data = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_POWER_CNTL));
+			data &= ~SDMA0_POWER_CNTL__MEM_POWER_OVERRIDE_MASK;
+			if (def != data)
+				WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_POWER_CNTL), data);
+
+		}
+	}
+}
+
+static int sdma_v5_2_set_clockgating_state(void *handle,
+					   enum amd_clockgating_state state)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	if (amdgpu_sriov_vf(adev))
+		return 0;
+
+	switch (adev->asic_type) {
+	case CHIP_SIENNA_CICHLID:
+		sdma_v5_2_update_medium_grain_clock_gating(adev,
+				state == AMD_CG_STATE_GATE ? true : false);
+		sdma_v5_2_update_medium_grain_light_sleep(adev,
+				state == AMD_CG_STATE_GATE ? true : false);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int sdma_v5_2_set_powergating_state(void *handle,
+					  enum amd_powergating_state state)
+{
+	return 0;
+}
+
+static void sdma_v5_2_get_clockgating_state(void *handle, u32 *flags)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+	int data;
+
+	if (amdgpu_sriov_vf(adev))
+		*flags = 0;
+
+	/* AMD_CG_SUPPORT_SDMA_LS */
+	data = RREG32(sdma_v5_2_get_reg_offset(adev, 0, mmSDMA0_POWER_CNTL));
+	if (data & SDMA0_POWER_CNTL__MEM_POWER_OVERRIDE_MASK)
+		*flags |= AMD_CG_SUPPORT_SDMA_LS;
+}
+
+const struct amd_ip_funcs sdma_v5_2_ip_funcs = {
+	.name = "sdma_v5_2",
+	.early_init = sdma_v5_2_early_init,
+	.late_init = NULL,
+	.sw_init = sdma_v5_2_sw_init,
+	.sw_fini = sdma_v5_2_sw_fini,
+	.hw_init = sdma_v5_2_hw_init,
+	.hw_fini = sdma_v5_2_hw_fini,
+	.suspend = sdma_v5_2_suspend,
+	.resume = sdma_v5_2_resume,
+	.is_idle = sdma_v5_2_is_idle,
+	.wait_for_idle = sdma_v5_2_wait_for_idle,
+	.soft_reset = sdma_v5_2_soft_reset,
+	.set_clockgating_state = sdma_v5_2_set_clockgating_state,
+	.set_powergating_state = sdma_v5_2_set_powergating_state,
+	.get_clockgating_state = sdma_v5_2_get_clockgating_state,
+};
+
+static const struct amdgpu_ring_funcs sdma_v5_2_ring_funcs = {
+	.type = AMDGPU_RING_TYPE_SDMA,
+	.align_mask = 0xf,
+	.nop = SDMA_PKT_NOP_HEADER_OP(SDMA_OP_NOP),
+	.support_64bit_ptrs = true,
+	.vmhub = AMDGPU_GFXHUB_0,
+	.get_rptr = sdma_v5_2_ring_get_rptr,
+	.get_wptr = sdma_v5_2_ring_get_wptr,
+	.set_wptr = sdma_v5_2_ring_set_wptr,
+	.emit_frame_size =
+		5 + /* sdma_v5_2_ring_init_cond_exec */
+		6 + /* sdma_v5_2_ring_emit_hdp_flush */
+		3 + /* hdp_invalidate */
+		6 + /* sdma_v5_2_ring_emit_pipeline_sync */
+		/* sdma_v5_2_ring_emit_vm_flush */
+		SOC15_FLUSH_GPU_TLB_NUM_WREG * 3 +
+		SOC15_FLUSH_GPU_TLB_NUM_REG_WAIT * 6 +
+		10 + 10 + 10, /* sdma_v5_2_ring_emit_fence x3 for user fence, vm fence */
+	.emit_ib_size = 7 + 6, /* sdma_v5_2_ring_emit_ib */
+	.emit_ib = sdma_v5_2_ring_emit_ib,
+	.emit_fence = sdma_v5_2_ring_emit_fence,
+	.emit_pipeline_sync = sdma_v5_2_ring_emit_pipeline_sync,
+	.emit_vm_flush = sdma_v5_2_ring_emit_vm_flush,
+	.emit_hdp_flush = sdma_v5_2_ring_emit_hdp_flush,
+	.test_ring = sdma_v5_2_ring_test_ring,
+	.test_ib = sdma_v5_2_ring_test_ib,
+	.insert_nop = sdma_v5_2_ring_insert_nop,
+	.pad_ib = sdma_v5_2_ring_pad_ib,
+	.emit_wreg = sdma_v5_2_ring_emit_wreg,
+	.emit_reg_wait = sdma_v5_2_ring_emit_reg_wait,
+	.emit_reg_write_reg_wait = sdma_v5_2_ring_emit_reg_write_reg_wait,
+	.init_cond_exec = sdma_v5_2_ring_init_cond_exec,
+	.patch_cond_exec = sdma_v5_2_ring_patch_cond_exec,
+	.preempt_ib = sdma_v5_2_ring_preempt_ib,
+};
+
+static void sdma_v5_2_set_ring_funcs(struct amdgpu_device *adev)
+{
+	int i;
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		adev->sdma.instance[i].ring.funcs = &sdma_v5_2_ring_funcs;
+		adev->sdma.instance[i].ring.me = i;
+	}
+}
+
+static const struct amdgpu_irq_src_funcs sdma_v5_2_trap_irq_funcs = {
+	.set = sdma_v5_2_set_trap_irq_state,
+	.process = sdma_v5_2_process_trap_irq,
+};
+
+static const struct amdgpu_irq_src_funcs sdma_v5_2_illegal_inst_irq_funcs = {
+	.process = sdma_v5_2_process_illegal_inst_irq,
+};
+
+static void sdma_v5_2_set_irq_funcs(struct amdgpu_device *adev)
+{
+	adev->sdma.trap_irq.num_types = AMDGPU_SDMA_IRQ_INSTANCE0 +
+					adev->sdma.num_instances;
+	adev->sdma.trap_irq.funcs = &sdma_v5_2_trap_irq_funcs;
+	adev->sdma.illegal_inst_irq.funcs = &sdma_v5_2_illegal_inst_irq_funcs;
+}
+
+/**
+ * sdma_v5_2_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.
+ * Used by the amdgpu ttm implementation to move pages if
+ * registered as the asic copy callback.
+ */
+static void sdma_v5_2_emit_copy_buffer(struct amdgpu_ib *ib,
+				       uint64_t src_offset,
+				       uint64_t dst_offset,
+				       uint32_t byte_count,
+				       bool tmz)
+{
+	ib->ptr[ib->length_dw++] = SDMA_PKT_HEADER_OP(SDMA_OP_COPY) |
+		SDMA_PKT_HEADER_SUB_OP(SDMA_SUBOP_COPY_LINEAR) |
+		SDMA_PKT_COPY_LINEAR_HEADER_TMZ(tmz ? 1 : 0);
+	ib->ptr[ib->length_dw++] = byte_count - 1;
+	ib->ptr[ib->length_dw++] = 0; /* src/dst endian swap */
+	ib->ptr[ib->length_dw++] = lower_32_bits(src_offset);
+	ib->ptr[ib->length_dw++] = upper_32_bits(src_offset);
+	ib->ptr[ib->length_dw++] = lower_32_bits(dst_offset);
+	ib->ptr[ib->length_dw++] = upper_32_bits(dst_offset);
+}
+
+/**
+ * sdma_v5_2_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.
+ */
+static void sdma_v5_2_emit_fill_buffer(struct amdgpu_ib *ib,
+				       uint32_t src_data,
+				       uint64_t dst_offset,
+				       uint32_t byte_count)
+{
+	ib->ptr[ib->length_dw++] = SDMA_PKT_HEADER_OP(SDMA_OP_CONST_FILL);
+	ib->ptr[ib->length_dw++] = lower_32_bits(dst_offset);
+	ib->ptr[ib->length_dw++] = upper_32_bits(dst_offset);
+	ib->ptr[ib->length_dw++] = src_data;
+	ib->ptr[ib->length_dw++] = byte_count - 1;
+}
+
+static const struct amdgpu_buffer_funcs sdma_v5_2_buffer_funcs = {
+	.copy_max_bytes = 0x400000,
+	.copy_num_dw = 7,
+	.emit_copy_buffer = sdma_v5_2_emit_copy_buffer,
+
+	.fill_max_bytes = 0x400000,
+	.fill_num_dw = 5,
+	.emit_fill_buffer = sdma_v5_2_emit_fill_buffer,
+};
+
+static void sdma_v5_2_set_buffer_funcs(struct amdgpu_device *adev)
+{
+	if (adev->mman.buffer_funcs == NULL) {
+		adev->mman.buffer_funcs = &sdma_v5_2_buffer_funcs;
+		adev->mman.buffer_funcs_ring = &adev->sdma.instance[0].ring;
+	}
+}
+
+static const struct amdgpu_vm_pte_funcs sdma_v5_2_vm_pte_funcs = {
+	.copy_pte_num_dw = 7,
+	.copy_pte = sdma_v5_2_vm_copy_pte,
+	.write_pte = sdma_v5_2_vm_write_pte,
+	.set_pte_pde = sdma_v5_2_vm_set_pte_pde,
+};
+
+static void sdma_v5_2_set_vm_pte_funcs(struct amdgpu_device *adev)
+{
+	unsigned i;
+
+	if (adev->vm_manager.vm_pte_funcs == NULL) {
+		adev->vm_manager.vm_pte_funcs = &sdma_v5_2_vm_pte_funcs;
+		for (i = 0; i < adev->sdma.num_instances; i++) {
+			adev->vm_manager.vm_pte_scheds[i] =
+				&adev->sdma.instance[i].ring.sched;
+		}
+		adev->vm_manager.vm_pte_num_scheds = adev->sdma.num_instances;
+	}
+}
+
+const struct amdgpu_ip_block_version sdma_v5_2_ip_block = {
+	.type = AMD_IP_BLOCK_TYPE_SDMA,
+	.major = 5,
+	.minor = 2,
+	.rev = 0,
+	.funcs = &sdma_v5_2_ip_funcs,
+};

drivers/gpu/drm/amd/amdgpu/sdma_v5_2.h

···
+/*
+ * Copyright 2019 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 __SDMA_V5_2_H__
+#define __SDMA_V5_2_H__
+
+extern const struct amd_ip_funcs sdma_v5_2_ip_funcs;
+extern const struct amdgpu_ip_block_version sdma_v5_2_ip_block;
+
+#endif /* __SDMA_V5_2_H__ */