drm/amdgpu: support mem copy for LSDMA

Support memory to memory linear copy in PIO mode for LSDMA.
Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -23,3 +23,29 @@
 
 #include "amdgpu.h"
 #include "amdgpu_lsdma.h"
+
+#define AMDGPU_LSDMA_MAX_SIZE	0x2000000ULL
+
+int amdgpu_lsdma_copy_mem(struct amdgpu_device *adev,
+			  uint64_t src_addr,
+			  uint64_t dst_addr,
+			  uint64_t mem_size)
+{
+	int ret;
+
+	if (mem_size == 0)
+		return -EINVAL;
+
+	while (mem_size > 0) {
+		uint64_t current_copy_size = min(mem_size, AMDGPU_LSDMA_MAX_SIZE);
+
+		ret = adev->lsdma.funcs->copy_mem(adev, src_addr, dst_addr, current_copy_size);
+		if (ret)
+			return ret;
+		src_addr += current_copy_size;
+		dst_addr += current_copy_size;
+		mem_size -= current_copy_size;
+	}
+
+	return 0;
+}

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

@@ -29,6 +29,11 @@ struct amdgpu_lsdma {
 };
 
 struct amdgpu_lsdma_funcs {
+	int (*copy_mem)(struct amdgpu_device *adev, uint64_t src_addr,
+			uint64_t dst_addr, uint64_t size);
 };
 
+int amdgpu_lsdma_copy_mem(struct amdgpu_device *adev, uint64_t src_addr,
+			  uint64_t dst_addr, uint64_t mem_size);
+
 #endif

drivers/gpu/drm/amd/amdgpu/lsdma_v6_0.c

@@ -29,5 +29,49 @@
 #include "lsdma/lsdma_6_0_0_offset.h"
 #include "lsdma/lsdma_6_0_0_sh_mask.h"
 
+static int lsdma_v6_0_copy_mem(struct amdgpu_device *adev,
+			       uint64_t src_addr,
+			       uint64_t dst_addr,
+			       uint64_t size)
+{
+	uint32_t usec_timeout = 5000;  /* wait for 5ms */
+	uint32_t tmp, expect_val;
+	int i;
+
+	WREG32_SOC15(LSDMA, 0, regLSDMA_PIO_SRC_ADDR_LO, lower_32_bits(src_addr));
+	WREG32_SOC15(LSDMA, 0, regLSDMA_PIO_SRC_ADDR_HI, upper_32_bits(src_addr));
+
+	WREG32_SOC15(LSDMA, 0, regLSDMA_PIO_DST_ADDR_LO, lower_32_bits(dst_addr));
+	WREG32_SOC15(LSDMA, 0, regLSDMA_PIO_DST_ADDR_HI, upper_32_bits(dst_addr));
+
+	WREG32_SOC15(LSDMA, 0, regLSDMA_PIO_CONTROL, 0x0);
+
+	tmp = RREG32_SOC15(LSDMA, 0, regLSDMA_PIO_COMMAND);
+	tmp = REG_SET_FIELD(tmp, LSDMA_PIO_COMMAND, BYTE_COUNT, size);
+	tmp = REG_SET_FIELD(tmp, LSDMA_PIO_COMMAND, SRC_LOCATION, 0);
+	tmp = REG_SET_FIELD(tmp, LSDMA_PIO_COMMAND, DST_LOCATION, 0);
+	tmp = REG_SET_FIELD(tmp, LSDMA_PIO_COMMAND, SRC_ADDR_INC, 0);
+	tmp = REG_SET_FIELD(tmp, LSDMA_PIO_COMMAND, DST_ADDR_INC, 0);
+	tmp = REG_SET_FIELD(tmp, LSDMA_PIO_COMMAND, OVERLAP_DISABLE, 0);
+	tmp = REG_SET_FIELD(tmp, LSDMA_PIO_COMMAND, CONSTANT_FILL, 0);
+	WREG32_SOC15(LSDMA, 0, regLSDMA_PIO_COMMAND, tmp);
+
+	expect_val = LSDMA_PIO_STATUS__PIO_IDLE_MASK | LSDMA_PIO_STATUS__PIO_FIFO_EMPTY_MASK;
+	for (i = 0; i < usec_timeout; i++) {
+		tmp = RREG32_SOC15(LSDMA, 0, regLSDMA_PIO_STATUS);
+		if ((tmp & expect_val) == expect_val)
+			break;
+		udelay(1);
+	}
+
+	if (i >= usec_timeout) {
+		dev_err(adev->dev, "LSDMA PIO failed to copy memory!\n");
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
 const struct amdgpu_lsdma_funcs lsdma_v6_0_funcs = {
+	.copy_mem = lsdma_v6_0_copy_mem
 };