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drm/amdgpu: flip frag_ptes and update_pts 

We can add the fragment params before we split the update for the page tables.
That should save a few CPU cycles for larger updates.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2016-08-05 13:56:35 +02:00 committed by Alex Deucher
parent 27c5f36fe1
commit 92696dd52e
1 changed files with 106 additions and 114 deletions
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220
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
View File

@ -702,17 +702,102 @@ error_free:
} }
/** /**
* amdgpu_vm_update_ptes - make sure that page tables are valid
*
* @params: see amdgpu_pte_update_params definition
* @vm: requested vm
* @start: start of GPU address range
* @end: end of GPU address range
* @dst: destination address to map to, the next dst inside the function
* @flags: mapping flags
*
* Update the page tables in the range @start - @end.
*/
static void amdgpu_vm_update_ptes(struct amdgpu_pte_update_params *params,
struct amdgpu_vm *vm,
uint64_t start, uint64_t end,
uint64_t dst, uint32_t flags)
{
const uint64_t mask = AMDGPU_VM_PTE_COUNT - 1;
uint64_t cur_pe_start, cur_nptes, cur_dst;
uint64_t addr; /* next GPU address to be updated */
uint64_t pt_idx;
struct amdgpu_bo *pt;
unsigned nptes; /* next number of ptes to be updated */
uint64_t next_pe_start;
/* initialize the variables */
addr = start;
pt_idx = addr >> amdgpu_vm_block_size;
pt = vm->page_tables[pt_idx].entry.robj;
if ((addr & ~mask) == (end & ~mask))
nptes = end - addr;
else
nptes = AMDGPU_VM_PTE_COUNT - (addr & mask);
cur_pe_start = amdgpu_bo_gpu_offset(pt);
cur_pe_start += (addr & mask) * 8;
cur_nptes = nptes;
cur_dst = dst;
/* for next ptb*/
addr += nptes;
dst += nptes * AMDGPU_GPU_PAGE_SIZE;
/* walk over the address space and update the page tables */
while (addr < end) {
pt_idx = addr >> amdgpu_vm_block_size;
pt = vm->page_tables[pt_idx].entry.robj;
if ((addr & ~mask) == (end & ~mask))
nptes = end - addr;
else
nptes = AMDGPU_VM_PTE_COUNT - (addr & mask);
next_pe_start = amdgpu_bo_gpu_offset(pt);
next_pe_start += (addr & mask) * 8;
if ((cur_pe_start + 8 * cur_nptes) == next_pe_start) {
/* The next ptb is consecutive to current ptb.
* Don't call amdgpu_vm_update_pages now.
* Will update two ptbs together in future.
*/
cur_nptes += nptes;
} else {
amdgpu_vm_update_pages(params, cur_pe_start, cur_dst,
cur_nptes, AMDGPU_GPU_PAGE_SIZE,
flags);
cur_pe_start = next_pe_start;
cur_nptes = nptes;
cur_dst = dst;
}
/* for next ptb*/
addr += nptes;
dst += nptes * AMDGPU_GPU_PAGE_SIZE;
}
amdgpu_vm_update_pages(params, cur_pe_start, cur_dst, cur_nptes,
AMDGPU_GPU_PAGE_SIZE, flags);
}
/*
* amdgpu_vm_frag_ptes - add fragment information to PTEs * amdgpu_vm_frag_ptes - add fragment information to PTEs
* *
* @params: see amdgpu_pte_update_params definition * @params: see amdgpu_pte_update_params definition
* @pe_start: first PTE to handle * @vm: requested vm
* @pe_end: last PTE to handle * @start: first PTE to handle
* @addr: addr those PTEs should point to * @end: last PTE to handle
* @dst: addr those PTEs should point to
* @flags: hw mapping flags * @flags: hw mapping flags
*/ */
static void amdgpu_vm_frag_ptes(struct amdgpu_pte_update_params *params, static void amdgpu_vm_frag_ptes(struct amdgpu_pte_update_params *params,
uint64_t pe_start, uint64_t pe_end, struct amdgpu_vm *vm,
uint64_t addr, uint32_t flags) uint64_t start, uint64_t end,
uint64_t dst, uint32_t flags)
{ {
/** /**
* The MC L1 TLB supports variable sized pages, based on a fragment * The MC L1 TLB supports variable sized pages, based on a fragment
@ -735,130 +820,37 @@ static void amdgpu_vm_frag_ptes(struct amdgpu_pte_update_params *params,
/* SI and newer are optimized for 64KB */ /* SI and newer are optimized for 64KB */
uint64_t frag_flags = AMDGPU_PTE_FRAG(AMDGPU_LOG2_PAGES_PER_FRAG); uint64_t frag_flags = AMDGPU_PTE_FRAG(AMDGPU_LOG2_PAGES_PER_FRAG);
uint64_t frag_align = 0x80; uint64_t frag_align = 1 << AMDGPU_LOG2_PAGES_PER_FRAG;
uint64_t frag_start = ALIGN(pe_start, frag_align); uint64_t frag_start = ALIGN(start, frag_align);
uint64_t frag_end = pe_end & ~(frag_align - 1); uint64_t frag_end = end & ~(frag_align - 1);
unsigned count;
/* Abort early if there isn't anything to do */
if (pe_start == pe_end)
return;
/* system pages are non continuously */ /* system pages are non continuously */
if (params->src || params->pages_addr || if (params->src || params->pages_addr || !(flags & AMDGPU_PTE_VALID) ||
!(flags & AMDGPU_PTE_VALID) || (frag_start >= frag_end)) { (frag_start >= frag_end)) {
count = (pe_end - pe_start) / 8; amdgpu_vm_update_ptes(params, vm, start, end, dst, flags);
amdgpu_vm_update_pages(params, pe_start, addr, count,
AMDGPU_GPU_PAGE_SIZE, flags);
return; return;
} }
/* handle the 4K area at the beginning */ /* handle the 4K area at the beginning */
if (pe_start != frag_start) { if (start != frag_start) {
count = (frag_start - pe_start) / 8; amdgpu_vm_update_ptes(params, vm, start, frag_start,
amdgpu_vm_update_pages(params, pe_start, addr, count, dst, flags);
AMDGPU_GPU_PAGE_SIZE, flags); dst += (frag_start - start) * AMDGPU_GPU_PAGE_SIZE;
addr += AMDGPU_GPU_PAGE_SIZE * count;
} }
/* handle the area in the middle */ /* handle the area in the middle */
count = (frag_end - frag_start) / 8; amdgpu_vm_update_ptes(params, vm, frag_start, frag_end, dst,
amdgpu_vm_update_pages(params, frag_start, addr, count, flags | frag_flags);
AMDGPU_GPU_PAGE_SIZE, flags | frag_flags);
/* handle the 4K area at the end */ /* handle the 4K area at the end */
if (frag_end != pe_end) { if (frag_end != end) {
addr += AMDGPU_GPU_PAGE_SIZE * count; dst += (frag_end - frag_start) * AMDGPU_GPU_PAGE_SIZE;
count = (pe_end - frag_end) / 8; amdgpu_vm_update_ptes(params, vm, frag_end, end, dst, flags);
amdgpu_vm_update_pages(params, frag_end, addr, count,
AMDGPU_GPU_PAGE_SIZE, flags);
} }
} }
/**
* amdgpu_vm_update_ptes - make sure that page tables are valid
*
* @params: see amdgpu_pte_update_params definition
* @vm: requested vm
* @start: start of GPU address range
* @end: end of GPU address range
* @dst: destination address to map to, the next dst inside the function
* @flags: mapping flags
*
* Update the page tables in the range @start - @end.
*/
static void amdgpu_vm_update_ptes(struct amdgpu_pte_update_params *params,
struct amdgpu_vm *vm,
uint64_t start, uint64_t end,
uint64_t dst, uint32_t flags)
{
const uint64_t mask = AMDGPU_VM_PTE_COUNT - 1;
uint64_t cur_pe_start, cur_pe_end, cur_dst;
uint64_t addr; /* next GPU address to be updated */
uint64_t pt_idx;
struct amdgpu_bo *pt;
unsigned nptes; /* next number of ptes to be updated */
uint64_t next_pe_start;
/* initialize the variables */
addr = start;
pt_idx = addr >> amdgpu_vm_block_size;
pt = vm->page_tables[pt_idx].entry.robj;
if ((addr & ~mask) == (end & ~mask))
nptes = end - addr;
else
nptes = AMDGPU_VM_PTE_COUNT - (addr & mask);
cur_pe_start = amdgpu_bo_gpu_offset(pt);
cur_pe_start += (addr & mask) * 8;
cur_pe_end = cur_pe_start + 8 * nptes;
cur_dst = dst;
/* for next ptb*/
addr += nptes;
dst += nptes * AMDGPU_GPU_PAGE_SIZE;
/* walk over the address space and update the page tables */
while (addr < end) {
pt_idx = addr >> amdgpu_vm_block_size;
pt = vm->page_tables[pt_idx].entry.robj;
if ((addr & ~mask) == (end & ~mask))
nptes = end - addr;
else
nptes = AMDGPU_VM_PTE_COUNT - (addr & mask);
next_pe_start = amdgpu_bo_gpu_offset(pt);
next_pe_start += (addr & mask) * 8;
if (cur_pe_end == next_pe_start) {
/* The next ptb is consecutive to current ptb.
* Don't call amdgpu_vm_frag_ptes now.
* Will update two ptbs together in future.
*/
cur_pe_end += 8 * nptes;
} else {
amdgpu_vm_frag_ptes(params, cur_pe_start, cur_pe_end,
cur_dst, flags);
cur_pe_start = next_pe_start;
cur_pe_end = next_pe_start + 8 * nptes;
cur_dst = dst;
}
/* for next ptb*/
addr += nptes;
dst += nptes * AMDGPU_GPU_PAGE_SIZE;
}
amdgpu_vm_frag_ptes(params, cur_pe_start, cur_pe_end, cur_dst, flags);
}
/** /**
* amdgpu_vm_bo_update_mapping - update a mapping in the vm page table * amdgpu_vm_bo_update_mapping - update a mapping in the vm page table
* *
@ -953,7 +945,7 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
if (r) if (r)
goto error_free; goto error_free;
amdgpu_vm_update_ptes(&params, vm, start, last + 1, addr, flags); amdgpu_vm_frag_ptes(&params, vm, start, last + 1, addr, flags);
amdgpu_ring_pad_ib(ring, params.ib); amdgpu_ring_pad_ib(ring, params.ib);
WARN_ON(params.ib->length_dw > ndw); WARN_ON(params.ib->length_dw > ndw);