From: Alex Deucher <alexander.deucher@xxxxxxx>
Async page table updates using the sDMA engine. sDMA has a
special packet for updating entries for contiguous pages
that reduces overhead.
v2: add support for and use the CP for now.
v3: update for 2 level PTs
v4: rebase, fix DMA packet
v5: switch to using an IB
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/gpu/drm/radeon/cik.c | 109 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 109 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index 3c18a63..cf1e0b1 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -3408,6 +3408,115 @@ void cik_vm_flush(struct radeon_device *rdev, int ridx, struct radeon_vm *vm)
}
/**
+ * cik_vm_set_page - update the page tables using sDMA
+ *
+ * @rdev: radeon_device pointer
+ * @ib: indirect buffer to fill with commands
+ * @pe: addr of the page entry
+ * @addr: dst addr to write into pe
+ * @count: number of page entries to update
+ * @incr: increase next addr by incr bytes
+ * @flags: access flags
+ *
+ * Update the page tables using CP or sDMA (CIK).
+ */
+void cik_vm_set_page(struct radeon_device *rdev,
+ struct radeon_ib *ib,
+ uint64_t pe,
+ uint64_t addr, unsigned count,
+ uint32_t incr, uint32_t flags)
+{
+ uint32_t r600_flags = cayman_vm_page_flags(rdev, flags);
+ uint64_t value;
+ unsigned ndw;
+
+ if (rdev->asic->vm.pt_ring_index == RADEON_RING_TYPE_GFX_INDEX) {
+ /* CP */
+ while (count) {
+ ndw = 2 + count * 2;
+ if (ndw > 0x3FFE)
+ ndw = 0x3FFE;
+
+ ib->ptr[ib->length_dw++] = PACKET3(PACKET3_WRITE_DATA, ndw);
+ ib->ptr[ib->length_dw++] = (WRITE_DATA_ENGINE_SEL(0) |
+ WRITE_DATA_DST_SEL(1));
+ ib->ptr[ib->length_dw++] = pe;
+ ib->ptr[ib->length_dw++] = upper_32_bits(pe);
+ for (; ndw > 2; ndw -= 2, --count, pe += 8) {
+ if (flags & RADEON_VM_PAGE_SYSTEM) {
+ value = radeon_vm_map_gart(rdev, addr);
+ value &= 0xFFFFFFFFFFFFF000ULL;
+ } else if (flags & RADEON_VM_PAGE_VALID) {
+ value = addr;
+ } else {
+ value = 0;
+ }
+ addr += incr;
+ value |= r600_flags;
+ ib->ptr[ib->length_dw++] = value;
+ ib->ptr[ib->length_dw++] = upper_32_bits(value);
+ }
+ }
+ } else {
+ /* DMA */
+ if (flags & RADEON_VM_PAGE_SYSTEM) {
+ while (count) {
+ ndw = count * 2;
+ if (ndw > 0xFFFFE)
+ ndw = 0xFFFFE;
+
+ /* for non-physically contiguous pages (system) */
+ ib->ptr[ib->length_dw++] = SDMA_PACKET(SDMA_OPCODE_WRITE, SDMA_WRITE_SUB_OPCODE_LINEAR, 0);
+ ib->ptr[ib->length_dw++] = pe;
+ ib->ptr[ib->length_dw++] = upper_32_bits(pe);
+ ib->ptr[ib->length_dw++] = ndw;
+ for (; ndw > 0; ndw -= 2, --count, pe += 8) {
+ if (flags & RADEON_VM_PAGE_SYSTEM) {
+ value = radeon_vm_map_gart(rdev, addr);
+ value &= 0xFFFFFFFFFFFFF000ULL;
+ } else if (flags & RADEON_VM_PAGE_VALID) {
+ value = addr;
+ } else {
+ value = 0;
+ }
+ addr += incr;
+ value |= r600_flags;
+ ib->ptr[ib->length_dw++] = value;
+ ib->ptr[ib->length_dw++] = upper_32_bits(value);
+ }
+ }
+ } else {
+ while (count) {
+ ndw = count;
+ if (ndw > 0x7FFFF)
+ ndw = 0x7FFFF;
+
+ if (flags & RADEON_VM_PAGE_VALID)
+ value = addr;
+ else
+ value = 0;
+ /* for physically contiguous pages (vram) */
+ ib->ptr[ib->length_dw++] = SDMA_PACKET(SDMA_OPCODE_GENERATE_PTE_PDE, 0, 0);
+ ib->ptr[ib->length_dw++] = pe; /* dst addr */
+ ib->ptr[ib->length_dw++] = upper_32_bits(pe);
+ ib->ptr[ib->length_dw++] = r600_flags; /* mask */
+ ib->ptr[ib->length_dw++] = 0;
+ ib->ptr[ib->length_dw++] = value; /* value */
+ ib->ptr[ib->length_dw++] = upper_32_bits(value);
+ ib->ptr[ib->length_dw++] = incr; /* increment size */
+ ib->ptr[ib->length_dw++] = 0;
+ ib->ptr[ib->length_dw++] = ndw; /* number of entries */
+ pe += ndw * 8;
+ addr += ndw * incr;
+ count -= ndw;
+ }
+ }
+ while (ib->length_dw & 0x7)
+ ib->ptr[ib->length_dw++] = SDMA_PACKET(SDMA_OPCODE_NOP, 0, 0);
+ }
+}
+
+/**
* cik_dma_vm_flush - cik vm flush using sDMA
*
* @rdev: radeon_device pointer
--
1.7.7.5
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