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drm/amdgpu: support mem copy for LSDMA

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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>
This commit is contained in:
Likun Gao 2022-05-06 14:45:54 -04:00 committed by Alex Deucher
parent 1b49133042
commit f932ffbbf6
3 changed files with 75 additions and 0 deletions
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26
drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.c
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@ -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;
}

5
drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.h
View File

@ -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

44
drivers/gpu/drm/amd/amdgpu/lsdma_v6_0.c
View File

@ -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
};