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drm/amdgpu: switch the GDS only on demand v2 

Switching the GDS space to often seems to be problematic.

This patch together with the following can avoid VM faults on context switch.

v2: extend commit message a bit

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com> (v1)
Reviewed-by: Chunming Zhou <david1.zhou@amd.com> (v1)
This commit is contained in:
Christian König 2016-03-01 15:09:25 +01:00 committed by Alex Deucher
parent cffadc83c7
commit 971fe9a941
3 changed files with 53 additions and 2 deletions
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8
drivers/gpu/drm/amd/amdgpu/amdgpu.h
View File

@ -922,6 +922,13 @@ struct amdgpu_vm_manager_id {
struct list_head list;
struct fence *active;
atomic_long_t owner;
uint32_t gds_base;
uint32_t gds_size;
uint32_t gws_base;
uint32_t gws_size;
uint32_t oa_base;
uint32_t oa_size;
};
struct amdgpu_vm_manager {
@ -961,6 +968,7 @@ void amdgpu_vm_flush(struct amdgpu_ring *ring,
uint32_t gds_base, uint32_t gds_size,
uint32_t gws_base, uint32_t gws_size,
uint32_t oa_base, uint32_t oa_size);
void amdgpu_vm_reset_id(struct amdgpu_device *adev, unsigned vm_id);
uint64_t amdgpu_vm_map_gart(const dma_addr_t *pages_addr, uint64_t addr);
int amdgpu_vm_update_page_directory(struct amdgpu_device *adev,
struct amdgpu_vm *vm);

4
drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
View File

@ -165,6 +165,8 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
if (ib->ctx != ctx || ib->vm != vm) {
ring->current_ctx = old_ctx;
if (ib->vm_id)
amdgpu_vm_reset_id(adev, ib->vm_id);
amdgpu_ring_undo(ring);
return -EINVAL;
}
@ -181,6 +183,8 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
if (r) {
dev_err(adev->dev, "failed to emit fence (%d)\n", r);
ring->current_ctx = old_ctx;
if (ib->vm_id)
amdgpu_vm_reset_id(adev, ib->vm_id);
amdgpu_ring_undo(ring);
return r;
}

43
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
View File

@ -252,16 +252,53 @@ void amdgpu_vm_flush(struct amdgpu_ring *ring,
uint32_t gws_base, uint32_t gws_size,
uint32_t oa_base, uint32_t oa_size)
{
struct amdgpu_device *adev = ring->adev;
struct amdgpu_vm_manager_id *mgr_id = &adev->vm_manager.ids[vm_id];
if (pd_addr != AMDGPU_VM_NO_FLUSH) {
trace_amdgpu_vm_flush(pd_addr, ring->idx, vm_id);
amdgpu_ring_emit_vm_flush(ring, vm_id, pd_addr);
}
if (ring->funcs->emit_gds_switch)
if (ring->funcs->emit_gds_switch && (
mgr_id->gds_base != gds_base ||
mgr_id->gds_size != gds_size ||
mgr_id->gws_base != gws_base ||
mgr_id->gws_size != gws_size ||
mgr_id->oa_base != oa_base ||
mgr_id->oa_size != oa_size)) {
mgr_id->gds_base = gds_base;
mgr_id->gds_size = gds_size;
mgr_id->gws_base = gws_base;
mgr_id->gws_size = gws_size;
mgr_id->oa_base = oa_base;
mgr_id->oa_size = oa_size;
amdgpu_ring_emit_gds_switch(ring, vm_id,
gds_base, gds_size,
gws_base, gws_size,
oa_base, oa_size);
}
}
/**
* amdgpu_vm_reset_id - reset VMID to zero
*
* @adev: amdgpu device structure
* @vm_id: vmid number to use
*
* Reset saved GDW, GWS and OA to force switch on next flush.
*/
void amdgpu_vm_reset_id(struct amdgpu_device *adev, unsigned vm_id)
{
struct amdgpu_vm_manager_id *mgr_id = &adev->vm_manager.ids[vm_id];
mgr_id->gds_base = 0;
mgr_id->gds_size = 0;
mgr_id->gws_base = 0;
mgr_id->gws_size = 0;
mgr_id->oa_base = 0;
mgr_id->oa_size = 0;
}
/**
@ -1425,9 +1462,11 @@ void amdgpu_vm_manager_init(struct amdgpu_device *adev)
INIT_LIST_HEAD(&adev->vm_manager.ids_lru);
/* skip over VMID 0, since it is the system VM */
for (i = 1; i < adev->vm_manager.num_ids; ++i)
for (i = 1; i < adev->vm_manager.num_ids; ++i) {
amdgpu_vm_reset_id(adev, i);
list_add_tail(&adev->vm_manager.ids[i].list,
&adev->vm_manager.ids_lru);
}
atomic_set(&adev->vm_manager.vm_pte_next_ring, 0);
}