From: Likun Gao <Likun.Gao@xxxxxxx>
Support memory to memory linear copy in PIO mode for LSDMA.
Signed-off-by: Likun Gao <Likun.Gao@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.c | 26 ++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.h | 5 +++
drivers/gpu/drm/amd/amdgpu/lsdma_v6_0.c | 44 +++++++++++++++++++++++
3 files changed, 75 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.c
index af00a66f8282..3f1c674afe41 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.c
+++ b/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;
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.h
index 4df4da423181..be397666e4c1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.h
@@ -30,6 +30,11 @@ 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
diff --git a/drivers/gpu/drm/amd/amdgpu/lsdma_v6_0.c b/drivers/gpu/drm/amd/amdgpu/lsdma_v6_0.c
index b611ade53be2..0d2bdd04bd76 100644
--- a/drivers/gpu/drm/amd/amdgpu/lsdma_v6_0.c
+++ b/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
};
--
2.35.1
