/*
 * Copyright 2014 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 <linux/delay.h>
#include <linux/firmware.h>
#include <linux/module.h>

#include "amdgpu.h"
#include "amdgpu_ucode.h"
#include "amdgpu_trace.h"
#include "vi.h"
#include "vid.h"

#include "oss/oss_2_4_d.h"
#include "oss/oss_2_4_sh_mask.h"

#include "gmc/gmc_7_1_d.h"
#include "gmc/gmc_7_1_sh_mask.h"

#include "gca/gfx_8_0_d.h"
#include "gca/gfx_8_0_enum.h"
#include "gca/gfx_8_0_sh_mask.h"

#include "bif/bif_5_0_d.h"
#include "bif/bif_5_0_sh_mask.h"

#include "iceland_sdma_pkt_open.h"

#include "ivsrcid/ivsrcid_vislands30.h"

static void sdma_v2_4_set_ring_funcs(struct amdgpu_device *adev);
static void sdma_v2_4_set_buffer_funcs(struct amdgpu_device *adev);
static void sdma_v2_4_set_vm_pte_funcs(struct amdgpu_device *adev);
static void sdma_v2_4_set_irq_funcs(struct amdgpu_device *adev);

MODULE_FIRMWARE("amdgpu/topaz_sdma.bin");
MODULE_FIRMWARE("amdgpu/topaz_sdma1.bin");

static const u32 sdma_offsets[SDMA_MAX_INSTANCE] =
{
        SDMA0_REGISTER_OFFSET,
        SDMA1_REGISTER_OFFSET
};

static const u32 golden_settings_iceland_a11[] =
{
        mmSDMA0_CHICKEN_BITS, 0xfc910007, 0x00810007,
        mmSDMA0_CLK_CTRL, 0xff000fff, 0x00000000,
        mmSDMA1_CHICKEN_BITS, 0xfc910007, 0x00810007,
        mmSDMA1_CLK_CTRL, 0xff000fff, 0x00000000,
};

static const u32 iceland_mgcg_cgcg_init[] =
{
        mmSDMA0_CLK_CTRL, 0xff000ff0, 0x00000100,
        mmSDMA1_CLK_CTRL, 0xff000ff0, 0x00000100
};

/*
 * sDMA - System DMA
 * Starting with CIK, the GPU has new asynchronous
 * DMA engines.  These engines are used for compute
 * and gfx.  There are two DMA engines (SDMA0, SDMA1)
 * and each one supports 1 ring buffer used for gfx
 * and 2 queues used for compute.
 *
 * The programming model is very similar to the CP
 * (ring buffer, IBs, etc.), but sDMA has it's own
 * packet format that is different from the PM4 format
 * used by the CP. sDMA supports copying data, writing
 * embedded data, solid fills, and a number of other
 * things.  It also has support for tiling/detiling of
 * buffers.
 */

static void sdma_v2_4_init_golden_registers(struct amdgpu_device *adev)
{
        switch (adev->asic_type) {
        case CHIP_TOPAZ:
                amdgpu_device_program_register_sequence(adev,
                                                        iceland_mgcg_cgcg_init,
                                                        ARRAY_SIZE(iceland_mgcg_cgcg_init));
                amdgpu_device_program_register_sequence(adev,
                                                        golden_settings_iceland_a11,
                                                        ARRAY_SIZE(golden_settings_iceland_a11));
                break;
        default:
                break;
        }
}

static void sdma_v2_4_free_microcode(struct amdgpu_device *adev)
{
        int i;
        for (i = 0; i < adev->sdma.num_instances; i++) {
                release_firmware(adev->sdma.instance[i].fw);
                adev->sdma.instance[i].fw = NULL;
        }
}

/**
 * sdma_v2_4_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.
 */
static int sdma_v2_4_init_microcode(struct amdgpu_device *adev)
{
        const char *chip_name;
        char fw_name[30];
        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_TOPAZ:
                chip_name = "topaz";
                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_sdma1.bin", chip_name);
                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;

                if (adev->firmware.load_type == AMDGPU_FW_LOAD_SMU) {
                        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) {
                pr_err("sdma_v2_4: 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;
}

/**
 * sdma_v2_4_ring_get_rptr - get the current read pointer
 *
 * @ring: amdgpu ring pointer
 *
 * Get the current rptr from the hardware (VI+).
 */
static uint64_t sdma_v2_4_ring_get_rptr(struct amdgpu_ring *ring)
{
        /* XXX check if swapping is necessary on BE */
        return ring->adev->wb.wb[ring->rptr_offs] >> 2;
}

/**
 * sdma_v2_4_ring_get_wptr - get the current write pointer
 *
 * @ring: amdgpu ring pointer
 *
 * Get the current wptr from the hardware (VI+).
 */
static uint64_t sdma_v2_4_ring_get_wptr(struct amdgpu_ring *ring)
{
        struct amdgpu_device *adev = ring->adev;
        u32 wptr = RREG32(mmSDMA0_GFX_RB_WPTR + sdma_offsets[ring->me]) >> 2;

        return wptr;
}

/**
 * sdma_v2_4_ring_set_wptr - commit the write pointer
 *
 * @ring: amdgpu ring pointer
 *
 * Write the wptr back to the hardware (VI+).
 */
static void sdma_v2_4_ring_set_wptr(struct amdgpu_ring *ring)
{
        struct amdgpu_device *adev = ring->adev;

        WREG32(mmSDMA0_GFX_RB_WPTR + sdma_offsets[ring->me], lower_32_bits(ring->wptr) << 2);
}

static void sdma_v2_4_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_v2_4_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 (VI).
 */
static void sdma_v2_4_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);

        /* IB packet must end on a 8 DW boundary */
        sdma_v2_4_ring_insert_nop(ring, (10 - (lower_32_bits(ring->wptr) & 7)) % 8);

        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, 0);
        amdgpu_ring_write(ring, 0);

}

/**
 * sdma_v2_4_hdp_flush_ring_emit - 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_v2_4_ring_emit_hdp_flush(struct amdgpu_ring *ring)
{
        u32 ref_and_mask = 0;

        if (ring->me == 0)
                ref_and_mask = REG_SET_FIELD(ref_and_mask, GPU_HDP_FLUSH_DONE, SDMA0, 1);
        else
                ref_and_mask = REG_SET_FIELD(ref_and_mask, GPU_HDP_FLUSH_DONE, SDMA1, 1);

        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, mmGPU_HDP_FLUSH_DONE << 2);
        amdgpu_ring_write(ring, mmGPU_HDP_FLUSH_REQ << 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_v2_4_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 sdma_v2_4_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, SDMA_PKT_HEADER_OP(SDMA_OP_FENCE));
        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));
                amdgpu_ring_write(ring, lower_32_bits(addr));
                amdgpu_ring_write(ring, upper_32_bits(addr));
                amdgpu_ring_write(ring, upper_32_bits(seq));
        }

        /* 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_v2_4_gfx_stop - stop the gfx async dma engines
 *
 * @adev: amdgpu_device pointer
 *
 * Stop the gfx async dma ring buffers (VI).
 */
static void sdma_v2_4_gfx_stop(struct amdgpu_device *adev)
{
        struct amdgpu_ring *sdma0 = &adev->sdma.instance[0].ring;
        struct amdgpu_ring *sdma1 = &adev->sdma.instance[1].ring;
        u32 rb_cntl, ib_cntl;
        int i;

        if ((adev->mman.buffer_funcs_ring == sdma0) ||
            (adev->mman.buffer_funcs_ring == sdma1))
                amdgpu_ttm_set_buffer_funcs_status(adev, false);

        for (i = 0; i < adev->sdma.num_instances; i++) {
                rb_cntl = RREG32(mmSDMA0_GFX_RB_CNTL + sdma_offsets[i]);
                rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RB_ENABLE, 0);
                WREG32(mmSDMA0_GFX_RB_CNTL + sdma_offsets[i], rb_cntl);
                ib_cntl = RREG32(mmSDMA0_GFX_IB_CNTL + sdma_offsets[i]);
                ib_cntl = REG_SET_FIELD(ib_cntl, SDMA0_GFX_IB_CNTL, IB_ENABLE, 0);
                WREG32(mmSDMA0_GFX_IB_CNTL + sdma_offsets[i], ib_cntl);
        }
        sdma0->sched.ready = false;
        sdma1->sched.ready = false;
}

/**
 * sdma_v2_4_rlc_stop - stop the compute async dma engines
 *
 * @adev: amdgpu_device pointer
 *
 * Stop the compute async dma queues (VI).
 */
static void sdma_v2_4_rlc_stop(struct amdgpu_device *adev)
{
        /* XXX todo */
}

/**
 * sdma_v2_4_enable - stop the async dma engines
 *
 * @adev: amdgpu_device pointer
 * @enable: enable/disable the DMA MEs.
 *
 * Halt or unhalt the async dma engines (VI).
 */
static void sdma_v2_4_enable(struct amdgpu_device *adev, bool enable)
{
        u32 f32_cntl;
        int i;

        if (!enable) {
                sdma_v2_4_gfx_stop(adev);
                sdma_v2_4_rlc_stop(adev);
        }

        for (i = 0; i < adev->sdma.num_instances; i++) {
                f32_cntl = RREG32(mmSDMA0_F32_CNTL + sdma_offsets[i]);
                if (enable)
                        f32_cntl = REG_SET_FIELD(f32_cntl, SDMA0_F32_CNTL, HALT, 0);
                else
                        f32_cntl = REG_SET_FIELD(f32_cntl, SDMA0_F32_CNTL, HALT, 1);
                WREG32(mmSDMA0_F32_CNTL + sdma_offsets[i], f32_cntl);
        }
}

/**
 * sdma_v2_4_gfx_resume - setup and start the async dma engines
 *
 * @adev: amdgpu_device pointer
 *
 * Set up the gfx DMA ring buffers and enable them (VI).
 * Returns 0 for success, error for failure.
 */
static int sdma_v2_4_gfx_resume(struct amdgpu_device *adev)
{
        struct amdgpu_ring *ring;
        u32 rb_cntl, ib_cntl;
        u32 rb_bufsz;
        u32 wb_offset;
        int i, j, r;

        for (i = 0; i < adev->sdma.num_instances; i++) {
                ring = &adev->sdma.instance[i].ring;
                wb_offset = (ring->rptr_offs * 4);

                mutex_lock(&adev->srbm_mutex);
                for (j = 0; j < 16; j++) {
                        vi_srbm_select(adev, 0, 0, 0, j);
                        /* SDMA GFX */
                        WREG32(mmSDMA0_GFX_VIRTUAL_ADDR + sdma_offsets[i], 0);
                        WREG32(mmSDMA0_GFX_APE1_CNTL + sdma_offsets[i], 0);
                }
                vi_srbm_select(adev, 0, 0, 0, 0);
                mutex_unlock(&adev->srbm_mutex);

                WREG32(mmSDMA0_TILING_CONFIG + sdma_offsets[i],
                       adev->gfx.config.gb_addr_config & 0x70);

                WREG32(mmSDMA0_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 = RREG32(mmSDMA0_GFX_RB_CNTL + sdma_offsets[i]);
                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(mmSDMA0_GFX_RB_CNTL + sdma_offsets[i], rb_cntl);

                /* Initialize the ring buffer's read and write pointers */
                WREG32(mmSDMA0_GFX_RB_RPTR + sdma_offsets[i], 0);
                WREG32(mmSDMA0_GFX_RB_WPTR + sdma_offsets[i], 0);
                WREG32(mmSDMA0_GFX_IB_RPTR + sdma_offsets[i], 0);
                WREG32(mmSDMA0_GFX_IB_OFFSET + sdma_offsets[i], 0);

                /* set the wb address whether it's enabled or not */
                WREG32(mmSDMA0_GFX_RB_RPTR_ADDR_HI + sdma_offsets[i],
                       upper_32_bits(adev->wb.gpu_addr + wb_offset) & 0xFFFFFFFF);
                WREG32(mmSDMA0_GFX_RB_RPTR_ADDR_LO + sdma_offsets[i],
                       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(mmSDMA0_GFX_RB_BASE + sdma_offsets[i], ring->gpu_addr >> 8);
                WREG32(mmSDMA0_GFX_RB_BASE_HI + sdma_offsets[i], ring->gpu_addr >> 40);

                ring->wptr = 0;
                WREG32(mmSDMA0_GFX_RB_WPTR + sdma_offsets[i], lower_32_bits(ring->wptr) << 2);

                /* enable DMA RB */
                rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RB_ENABLE, 1);
                WREG32(mmSDMA0_GFX_RB_CNTL + sdma_offsets[i], rb_cntl);

                ib_cntl = RREG32(mmSDMA0_GFX_IB_CNTL + sdma_offsets[i]);
                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(mmSDMA0_GFX_IB_CNTL + sdma_offsets[i], ib_cntl);

                ring->sched.ready = true;
        }

        sdma_v2_4_enable(adev, true);
        for (i = 0; i < adev->sdma.num_instances; i++) {
                ring = &adev->sdma.instance[i].ring;
                r = amdgpu_ring_test_helper(ring);
                if (r)
                        return r;

                if (adev->mman.buffer_funcs_ring == ring)
                        amdgpu_ttm_set_buffer_funcs_status(adev, true);
        }

        return 0;
}

/**
 * sdma_v2_4_rlc_resume - setup and start the async dma engines
 *
 * @adev: amdgpu_device pointer
 *
 * Set up the compute DMA queues and enable them (VI).
 * Returns 0 for success, error for failure.
 */
static int sdma_v2_4_rlc_resume(struct amdgpu_device *adev)
{
        /* XXX todo */
        return 0;
}


/**
 * sdma_v2_4_start - setup and start the async dma engines
 *
 * @adev: amdgpu_device pointer
 *
 * Set up the DMA engines and enable them (VI).
 * Returns 0 for success, error for failure.
 */
static int sdma_v2_4_start(struct amdgpu_device *adev)
{
        int r;

        /* halt the engine before programing */
        sdma_v2_4_enable(adev, false);

        /* start the gfx rings and rlc compute queues */
        r = sdma_v2_4_gfx_resume(adev);
        if (r)
                return r;
        r = sdma_v2_4_rlc_resume(adev);
        if (r)
                return r;

        return 0;
}

/**
 * sdma_v2_4_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 sdma_v2_4_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)
                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)
                goto error_free_wb;

        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(1));
        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;
                udelay(1);
        }

        if (i >= adev->usec_timeout)
                r = -ETIMEDOUT;

error_free_wb:
        amdgpu_device_wb_free(adev, index);
        return r;
}

/**
 * sdma_v2_4_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 sdma_v2_4_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;
        u32 tmp = 0;
        u64 gpu_addr;
        long r;

        r = amdgpu_device_wb_get(adev, &index);
        if (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)
                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(1);
        ib.ptr[4] = 0xDEADBEEF;
        ib.ptr[5] = SDMA_PKT_HEADER_OP(SDMA_OP_NOP);
        ib.ptr[6] = SDMA_PKT_HEADER_OP(SDMA_OP_NOP);
        ib.ptr[7] = SDMA_PKT_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) {
                r = -ETIMEDOUT;
                goto err1;
        } else if (r < 0) {
                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_v2_4_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 (CIK).
 */
static void sdma_v2_4_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;
        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_v2_4_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 sDMA (CIK).
 */
static void sdma_v2_4_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++] = pe;
        ib->ptr[ib->length_dw++] = upper_32_bits(pe);
        ib->ptr[ib->length_dw++] = ndw;
        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_v2_4_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 sdma_v2_4_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_GEN_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; /* number of entries */
}

/**
 * sdma_v2_4_ring_pad_ib - pad the IB to the required number of dw
 *
 * @ib: indirect buffer to fill with padding
 *
 */
static void sdma_v2_4_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 = (8 - (ib->length_dw & 0x7)) % 8;
        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_v2_4_ring_emit_pipeline_sync - sync the pipeline
 *
 * @ring: amdgpu_ring pointer
 *
 * Make sure all previous operations are completed (CIK).
 */
static void sdma_v2_4_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_v2_4_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 sdma_v2_4_ring_emit_vm_flush(struct amdgpu_ring *ring,
                                         unsigned vmid, uint64_t pd_addr)
{
        amdgpu_gmc_emit_flush_gpu_tlb(ring, vmid, pd_addr);

        /* wait for flush */
        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(0)); /* always */
        amdgpu_ring_write(ring, mmVM_INVALIDATE_REQUEST << 2);
        amdgpu_ring_write(ring, 0);
        amdgpu_ring_write(ring, 0); /* reference */
        amdgpu_ring_write(ring, 0); /* mask */
        amdgpu_ring_write(ring, SDMA_PKT_POLL_REGMEM_DW5_RETRY_COUNT(0xfff) |
                          SDMA_PKT_POLL_REGMEM_DW5_INTERVAL(10)); /* retry count, poll interval */
}

static void sdma_v2_4_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 int sdma_v2_4_early_init(void *handle)
{
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;

        adev->sdma.num_instances = SDMA_MAX_INSTANCE;

        sdma_v2_4_set_ring_funcs(adev);
        sdma_v2_4_set_buffer_funcs(adev);
        sdma_v2_4_set_vm_pte_funcs(adev);
        sdma_v2_4_set_irq_funcs(adev);

        return 0;
}

static int sdma_v2_4_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, AMDGPU_IRQ_CLIENTID_LEGACY, VISLANDS30_IV_SRCID_SDMA_TRAP,
                              &adev->sdma.trap_irq);
        if (r)
                return r;

        /* SDMA Privileged inst */
        r = amdgpu_irq_add_id(adev, AMDGPU_IRQ_CLIENTID_LEGACY, 241,
                              &adev->sdma.illegal_inst_irq);
        if (r)
                return r;

        /* SDMA Privileged inst */
        r = amdgpu_irq_add_id(adev, AMDGPU_IRQ_CLIENTID_LEGACY, VISLANDS30_IV_SRCID_SDMA_SRBM_WRITE,
                              &adev->sdma.illegal_inst_irq);
        if (r)
                return r;

        r = sdma_v2_4_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 = false;
                sprintf(ring->name, "sdma%d", i);
                r = amdgpu_ring_init(adev, ring, 1024,
                                     &adev->sdma.trap_irq,
                                     (i == 0) ?
                                     AMDGPU_SDMA_IRQ_INSTANCE0 :
                                     AMDGPU_SDMA_IRQ_INSTANCE1);
                if (r)
                        return r;
        }

        return r;
}

static int sdma_v2_4_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);

        sdma_v2_4_free_microcode(adev);
        return 0;
}

static int sdma_v2_4_hw_init(void *handle)
{
        int r;
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;

        sdma_v2_4_init_golden_registers(adev);

        r = sdma_v2_4_start(adev);
        if (r)
                return r;

        return r;
}

static int sdma_v2_4_hw_fini(void *handle)
{
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;

        sdma_v2_4_enable(adev, false);

        return 0;
}

static int sdma_v2_4_suspend(void *handle)
{
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;

        return sdma_v2_4_hw_fini(adev);
}

static int sdma_v2_4_resume(void *handle)
{
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;

        return sdma_v2_4_hw_init(adev);
}

static bool sdma_v2_4_is_idle(void *handle)
{
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;
        u32 tmp = RREG32(mmSRBM_STATUS2);

        if (tmp & (SRBM_STATUS2__SDMA_BUSY_MASK |
                   SRBM_STATUS2__SDMA1_BUSY_MASK))
            return false;

        return true;
}

static int sdma_v2_4_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(mmSRBM_STATUS2) & (SRBM_STATUS2__SDMA_BUSY_MASK |
                                SRBM_STATUS2__SDMA1_BUSY_MASK);

                if (!tmp)
                        return 0;
                udelay(1);
        }
        return -ETIMEDOUT;
}

static int sdma_v2_4_soft_reset(void *handle)
{
        u32 srbm_soft_reset = 0;
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;
        u32 tmp = RREG32(mmSRBM_STATUS2);

        if (tmp & SRBM_STATUS2__SDMA_BUSY_MASK) {
                /* sdma0 */
                tmp = RREG32(mmSDMA0_F32_CNTL + SDMA0_REGISTER_OFFSET);
                tmp = REG_SET_FIELD(tmp, SDMA0_F32_CNTL, HALT, 0);
                WREG32(mmSDMA0_F32_CNTL + SDMA0_REGISTER_OFFSET, tmp);
                srbm_soft_reset |= SRBM_SOFT_RESET__SOFT_RESET_SDMA_MASK;
        }
        if (tmp & SRBM_STATUS2__SDMA1_BUSY_MASK) {
                /* sdma1 */
                tmp = RREG32(mmSDMA0_F32_CNTL + SDMA1_REGISTER_OFFSET);
                tmp = REG_SET_FIELD(tmp, SDMA0_F32_CNTL, HALT, 0);
                WREG32(mmSDMA0_F32_CNTL + SDMA1_REGISTER_OFFSET, tmp);
                srbm_soft_reset |= SRBM_SOFT_RESET__SOFT_RESET_SDMA1_MASK;
        }

        if (srbm_soft_reset) {
                tmp = RREG32(mmSRBM_SOFT_RESET);
                tmp |= srbm_soft_reset;
                dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp);
                WREG32(mmSRBM_SOFT_RESET, tmp);
                tmp = RREG32(mmSRBM_SOFT_RESET);

                udelay(50);

                tmp &= ~srbm_soft_reset;
                WREG32(mmSRBM_SOFT_RESET, tmp);
                tmp = RREG32(mmSRBM_SOFT_RESET);

                /* Wait a little for things to settle down */
                udelay(50);
        }

        return 0;
}

static int sdma_v2_4_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_INSTANCE0:
                switch (state) {
                case AMDGPU_IRQ_STATE_DISABLE:
                        sdma_cntl = RREG32(mmSDMA0_CNTL + SDMA0_REGISTER_OFFSET);
                        sdma_cntl = REG_SET_FIELD(sdma_cntl, SDMA0_CNTL, TRAP_ENABLE, 0);
                        WREG32(mmSDMA0_CNTL + SDMA0_REGISTER_OFFSET, sdma_cntl);
                        break;
                case AMDGPU_IRQ_STATE_ENABLE:
                        sdma_cntl = RREG32(mmSDMA0_CNTL + SDMA0_REGISTER_OFFSET);
                        sdma_cntl = REG_SET_FIELD(sdma_cntl, SDMA0_CNTL, TRAP_ENABLE, 1);
                        WREG32(mmSDMA0_CNTL + SDMA0_REGISTER_OFFSET, sdma_cntl);
                        break;
                default:
                        break;
                }
                break;
        case AMDGPU_SDMA_IRQ_INSTANCE1:
                switch (state) {
                case AMDGPU_IRQ_STATE_DISABLE:
                        sdma_cntl = RREG32(mmSDMA0_CNTL + SDMA1_REGISTER_OFFSET);
                        sdma_cntl = REG_SET_FIELD(sdma_cntl, SDMA0_CNTL, TRAP_ENABLE, 0);
                        WREG32(mmSDMA0_CNTL + SDMA1_REGISTER_OFFSET, sdma_cntl);
                        break;
                case AMDGPU_IRQ_STATE_ENABLE:
                        sdma_cntl = RREG32(mmSDMA0_CNTL + SDMA1_REGISTER_OFFSET);
                        sdma_cntl = REG_SET_FIELD(sdma_cntl, SDMA0_CNTL, TRAP_ENABLE, 1);
                        WREG32(mmSDMA0_CNTL + SDMA1_REGISTER_OFFSET, sdma_cntl);
                        break;
                default:
                        break;
                }
                break;
        default:
                break;
        }
        return 0;
}

static int sdma_v2_4_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;
        DRM_DEBUG("IH: SDMA trap\n");
        switch (instance_id) {
        case 0:
                switch (queue_id) {
                case 0:
                        amdgpu_fence_process(&adev->sdma.instance[0].ring);
                        break;
                case 1:
                        /* XXX compute */
                        break;
                case 2:
                        /* XXX compute */
                        break;
                }
                break;
        case 1:
                switch (queue_id) {
                case 0:
                        amdgpu_fence_process(&adev->sdma.instance[1].ring);
                        break;
                case 1:
                        /* XXX compute */
                        break;
                case 2:
                        /* XXX compute */
                        break;
                }
                break;
        }
        return 0;
}

static int sdma_v2_4_process_illegal_inst_irq(struct amdgpu_device *adev,
                                              struct amdgpu_irq_src *source,
                                              struct amdgpu_iv_entry *entry)
{
        u8 instance_id, queue_id;

        DRM_ERROR("Illegal instruction in SDMA command stream\n");
        instance_id = (entry->ring_id & 0x3) >> 0;
        queue_id = (entry->ring_id & 0xc) >> 2;

        if (instance_id <= 1 && queue_id == 0)
                drm_sched_fault(&adev->sdma.instance[instance_id].ring.sched);
        return 0;
}

static int sdma_v2_4_set_clockgating_state(void *handle,
                                          enum amd_clockgating_state state)
{
        /* XXX handled via the smc on VI */
        return 0;
}

static int sdma_v2_4_set_powergating_state(void *handle,
                                          enum amd_powergating_state state)
{
        return 0;
}

static const struct amd_ip_funcs sdma_v2_4_ip_funcs = {
        .name = "sdma_v2_4",
        .early_init = sdma_v2_4_early_init,
        .late_init = NULL,
        .sw_init = sdma_v2_4_sw_init,
        .sw_fini = sdma_v2_4_sw_fini,
        .hw_init = sdma_v2_4_hw_init,
        .hw_fini = sdma_v2_4_hw_fini,
        .suspend = sdma_v2_4_suspend,
        .resume = sdma_v2_4_resume,
        .is_idle = sdma_v2_4_is_idle,
        .wait_for_idle = sdma_v2_4_wait_for_idle,
        .soft_reset = sdma_v2_4_soft_reset,
        .set_clockgating_state = sdma_v2_4_set_clockgating_state,
        .set_powergating_state = sdma_v2_4_set_powergating_state,
};

static const struct amdgpu_ring_funcs sdma_v2_4_ring_funcs = {
        .type = AMDGPU_RING_TYPE_SDMA,
        .align_mask = 0xf,
        .nop = SDMA_PKT_NOP_HEADER_OP(SDMA_OP_NOP),
        .support_64bit_ptrs = false,
        .get_rptr = sdma_v2_4_ring_get_rptr,
        .get_wptr = sdma_v2_4_ring_get_wptr,
        .set_wptr = sdma_v2_4_ring_set_wptr,
        .emit_frame_size =
                6 + /* sdma_v2_4_ring_emit_hdp_flush */
                3 + /* hdp invalidate */
                6 + /* sdma_v2_4_ring_emit_pipeline_sync */
                VI_FLUSH_GPU_TLB_NUM_WREG * 3 + 6 + /* sdma_v2_4_ring_emit_vm_flush */
                10 + 10 + 10, /* sdma_v2_4_ring_emit_fence x3 for user fence, vm fence */
        .emit_ib_size = 7 + 6, /* sdma_v2_4_ring_emit_ib */
        .emit_ib = sdma_v2_4_ring_emit_ib,
        .emit_fence = sdma_v2_4_ring_emit_fence,
        .emit_pipeline_sync = sdma_v2_4_ring_emit_pipeline_sync,
        .emit_vm_flush = sdma_v2_4_ring_emit_vm_flush,
        .emit_hdp_flush = sdma_v2_4_ring_emit_hdp_flush,
        .test_ring = sdma_v2_4_ring_test_ring,
        .test_ib = sdma_v2_4_ring_test_ib,
        .insert_nop = sdma_v2_4_ring_insert_nop,
        .pad_ib = sdma_v2_4_ring_pad_ib,
        .emit_wreg = sdma_v2_4_ring_emit_wreg,
};

static void sdma_v2_4_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_v2_4_ring_funcs;
                adev->sdma.instance[i].ring.me = i;
        }
}

static const struct amdgpu_irq_src_funcs sdma_v2_4_trap_irq_funcs = {
        .set = sdma_v2_4_set_trap_irq_state,
        .process = sdma_v2_4_process_trap_irq,
};

static const struct amdgpu_irq_src_funcs sdma_v2_4_illegal_inst_irq_funcs = {
        .process = sdma_v2_4_process_illegal_inst_irq,
};

static void sdma_v2_4_set_irq_funcs(struct amdgpu_device *adev)
{
        adev->sdma.trap_irq.num_types = AMDGPU_SDMA_IRQ_LAST;
        adev->sdma.trap_irq.funcs = &sdma_v2_4_trap_irq_funcs;
        adev->sdma.illegal_inst_irq.funcs = &sdma_v2_4_illegal_inst_irq_funcs;
}

/**
 * sdma_v2_4_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 sdma_v2_4_emit_copy_buffer(struct amdgpu_ib *ib,
                                       uint64_t src_offset,
                                       uint64_t dst_offset,
                                       uint32_t byte_count)
{
        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++] = byte_count;
        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_v2_4_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 sdma_v2_4_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;
}

static const struct amdgpu_buffer_funcs sdma_v2_4_buffer_funcs = {
        .copy_max_bytes = 0x1fffff,
        .copy_num_dw = 7,
        .emit_copy_buffer = sdma_v2_4_emit_copy_buffer,

        .fill_max_bytes = 0x1fffff,
        .fill_num_dw = 7,
        .emit_fill_buffer = sdma_v2_4_emit_fill_buffer,
};

static void sdma_v2_4_set_buffer_funcs(struct amdgpu_device *adev)
{
        adev->mman.buffer_funcs = &sdma_v2_4_buffer_funcs;
        adev->mman.buffer_funcs_ring = &adev->sdma.instance[0].ring;
}

static const struct amdgpu_vm_pte_funcs sdma_v2_4_vm_pte_funcs = {
        .copy_pte_num_dw = 7,
        .copy_pte = sdma_v2_4_vm_copy_pte,

        .write_pte = sdma_v2_4_vm_write_pte,
        .set_pte_pde = sdma_v2_4_vm_set_pte_pde,
};

static void sdma_v2_4_set_vm_pte_funcs(struct amdgpu_device *adev)
{
        struct drm_gpu_scheduler *sched;
        unsigned i;

        adev->vm_manager.vm_pte_funcs = &sdma_v2_4_vm_pte_funcs;
        for (i = 0; i < adev->sdma.num_instances; i++) {
                sched = &adev->sdma.instance[i].ring.sched;
                adev->vm_manager.vm_pte_rqs[i] =
                        &sched->sched_rq[DRM_SCHED_PRIORITY_KERNEL];
        }
        adev->vm_manager.vm_pte_num_rqs = adev->sdma.num_instances;
}

const struct amdgpu_ip_block_version sdma_v2_4_ip_block =
{
        .type = AMD_IP_BLOCK_TYPE_SDMA,
        .major = 2,
        .minor = 4,
        .rev = 0,
        .funcs = &sdma_v2_4_ip_funcs,
};