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drm/amdgpu: use 256 bit buffers for all wb allocations (v2)

Browse Source 
May waste a bit of memory, but simplifies the interface
significantly.

v2: convert internal accounting to use 256bit slots

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2017-07-28 12:14:15 -04:00
parent b7cecbe8d5
commit 97407b63ea
3 changed files with 20 additions and 126 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/amd/amdgpu/amdgpu.h
View File

@ -1131,10 +1131,6 @@ struct amdgpu_wb {
int amdgpu_wb_get(struct amdgpu_device *adev, u32 *wb);
void amdgpu_wb_free(struct amdgpu_device *adev, u32 wb);
int amdgpu_wb_get_64bit(struct amdgpu_device *adev, u32 *wb);
int amdgpu_wb_get_256bit(struct amdgpu_device *adev, u32 *wb);
void amdgpu_wb_free_64bit(struct amdgpu_device *adev, u32 wb);
void amdgpu_wb_free_256bit(struct amdgpu_device *adev, u32 wb);
void amdgpu_get_pcie_info(struct amdgpu_device *adev);

77
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
View File

@ -504,7 +504,8 @@ static int amdgpu_wb_init(struct amdgpu_device *adev)
int r;
if (adev->wb.wb_obj == NULL) {
r = amdgpu_bo_create_kernel(adev, AMDGPU_MAX_WB * sizeof(uint32_t),
/* AMDGPU_MAX_WB * sizeof(uint32_t) * 8 = AMDGPU_MAX_WB 256bit slots */
r = amdgpu_bo_create_kernel(adev, AMDGPU_MAX_WB * sizeof(uint32_t) * 8,
PAGE_SIZE, AMDGPU_GEM_DOMAIN_GTT,
&adev->wb.wb_obj, &adev->wb.gpu_addr,
(void **)&adev->wb.wb);
@ -535,47 +536,10 @@ static int amdgpu_wb_init(struct amdgpu_device *adev)
int amdgpu_wb_get(struct amdgpu_device *adev, u32 *wb)
{
unsigned long offset = find_first_zero_bit(adev->wb.used, adev->wb.num_wb);
if (offset < adev->wb.num_wb) {
__set_bit(offset, adev->wb.used);
*wb = offset;
return 0;
} else {
return -EINVAL;
}
}
/**
* amdgpu_wb_get_64bit - Allocate a wb entry
*
* @adev: amdgpu_device pointer
* @wb: wb index
*
* Allocate a wb slot for use by the driver (all asics).
* Returns 0 on success or -EINVAL on failure.
*/
int amdgpu_wb_get_64bit(struct amdgpu_device *adev, u32 *wb)
{
unsigned long offset = bitmap_find_next_zero_area_off(adev->wb.used,
adev->wb.num_wb, 0, 2, 7, 0);
if ((offset + 1) < adev->wb.num_wb) {
__set_bit(offset, adev->wb.used);
__set_bit(offset + 1, adev->wb.used);
*wb = offset;
return 0;
} else {
return -EINVAL;
}
}
int amdgpu_wb_get_256bit(struct amdgpu_device *adev, u32 *wb)
{
int i = 0;
unsigned long offset = bitmap_find_next_zero_area_off(adev->wb.used,
adev->wb.num_wb, 0, 8, 63, 0);
if ((offset + 7) < adev->wb.num_wb) {
for (i = 0; i < 8; i++)
__set_bit(offset + i, adev->wb.used);
*wb = offset;
*wb = offset * 8; /* convert to dw offset */
return 0;
} else {
return -EINVAL;
@ -596,39 +560,6 @@ void amdgpu_wb_free(struct amdgpu_device *adev, u32 wb)
__clear_bit(wb, adev->wb.used);
}
/**
* amdgpu_wb_free_64bit - Free a wb entry
*
* @adev: amdgpu_device pointer
* @wb: wb index
*
* Free a wb slot allocated for use by the driver (all asics)
*/
void amdgpu_wb_free_64bit(struct amdgpu_device *adev, u32 wb)
{
if ((wb + 1) < adev->wb.num_wb) {
__clear_bit(wb, adev->wb.used);
__clear_bit(wb + 1, adev->wb.used);
}
}
/**
* amdgpu_wb_free_256bit - Free a wb entry
*
* @adev: amdgpu_device pointer
* @wb: wb index
*
* Free a wb slot allocated for use by the driver (all asics)
*/
void amdgpu_wb_free_256bit(struct amdgpu_device *adev, u32 wb)
{
int i = 0;
if ((wb + 7) < adev->wb.num_wb)
for (i = 0; i < 8; i++)
__clear_bit(wb + i, adev->wb.used);
}
/**
* amdgpu_vram_location - try to find VRAM location
* @adev: amdgpu device structure holding all necessary informations

65
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
View File

@ -184,47 +184,22 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
return r;
}
if (ring->funcs->support_64bit_ptrs) {
r = amdgpu_wb_get_64bit(adev, &ring->rptr_offs);
if (r) {
dev_err(adev->dev, "(%d) ring rptr_offs wb alloc failed\n", r);
return r;
}
r = amdgpu_wb_get_64bit(adev, &ring->wptr_offs);
if (r) {
dev_err(adev->dev, "(%d) ring wptr_offs wb alloc failed\n", r);
return r;
}
} else {
r = amdgpu_wb_get(adev, &ring->rptr_offs);
if (r) {
dev_err(adev->dev, "(%d) ring rptr_offs wb alloc failed\n", r);
return r;
}
r = amdgpu_wb_get(adev, &ring->wptr_offs);
if (r) {
dev_err(adev->dev, "(%d) ring wptr_offs wb alloc failed\n", r);
return r;
}
r = amdgpu_wb_get(adev, &ring->rptr_offs);
if (r) {
dev_err(adev->dev, "(%d) ring rptr_offs wb alloc failed\n", r);
return r;
}
if (amdgpu_sriov_vf(adev) && ring->funcs->type == AMDGPU_RING_TYPE_GFX) {
r = amdgpu_wb_get_256bit(adev, &ring->fence_offs);
if (r) {
dev_err(adev->dev, "(%d) ring fence_offs wb alloc failed\n", r);
return r;
}
r = amdgpu_wb_get(adev, &ring->wptr_offs);
if (r) {
dev_err(adev->dev, "(%d) ring wptr_offs wb alloc failed\n", r);
return r;
}
} else {
r = amdgpu_wb_get(adev, &ring->fence_offs);
if (r) {
dev_err(adev->dev, "(%d) ring fence_offs wb alloc failed\n", r);
return r;
}
r = amdgpu_wb_get(adev, &ring->fence_offs);
if (r) {
dev_err(adev->dev, "(%d) ring fence_offs wb alloc failed\n", r);
return r;
}
r = amdgpu_wb_get(adev, &ring->cond_exe_offs);
@ -286,19 +261,11 @@ void amdgpu_ring_fini(struct amdgpu_ring *ring)
{
ring->ready = false;
if (ring->funcs->support_64bit_ptrs) {
amdgpu_wb_free_64bit(ring->adev, ring->rptr_offs);
amdgpu_wb_free_64bit(ring->adev, ring->wptr_offs);
} else {
amdgpu_wb_free(ring->adev, ring->rptr_offs);
amdgpu_wb_free(ring->adev, ring->wptr_offs);
}
amdgpu_wb_free(ring->adev, ring->rptr_offs);
amdgpu_wb_free(ring->adev, ring->wptr_offs);
amdgpu_wb_free(ring->adev, ring->cond_exe_offs);
if (amdgpu_sriov_vf(ring->adev) && ring->funcs->type == AMDGPU_RING_TYPE_GFX)
amdgpu_wb_free_256bit(ring->adev, ring->fence_offs);
else
amdgpu_wb_free(ring->adev, ring->fence_offs);
amdgpu_wb_free(ring->adev, ring->fence_offs);
amdgpu_bo_free_kernel(&ring->ring_obj,
&ring->gpu_addr,