winsys/amdgpu: implement IB chaining on the gfx ring
As a consequence, CE IB size never triggers a flush anymore. Reviewed-by: Marek Olšák <marek.olsak@amd.com>
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@ -35,6 +35,7 @@
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#include <stdio.h>
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#include <amdgpu_drm.h>
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#include "../../../drivers/radeonsi/sid.h"
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/* FENCES */
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@ -226,6 +227,19 @@ static bool amdgpu_cs_has_user_fence(struct amdgpu_cs_context *cs)
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cs->request.ip_type != AMDGPU_HW_IP_VCE;
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}
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static bool amdgpu_cs_has_chaining(enum ring_type ring_type)
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{
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return ring_type == RING_GFX;
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}
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static unsigned amdgpu_cs_epilog_dws(enum ring_type ring_type)
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{
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if (ring_type == RING_GFX)
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return 4; /* for chaining */
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return 0;
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}
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int amdgpu_lookup_buffer(struct amdgpu_cs_context *cs, struct amdgpu_winsys_bo *bo)
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{
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unsigned hash = bo->unique_id & (ARRAY_SIZE(cs->buffer_indices_hashlist)-1);
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@ -342,13 +356,18 @@ static bool amdgpu_ib_new_buffer(struct amdgpu_winsys *ws, struct amdgpu_ib *ib)
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uint8_t *mapped;
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unsigned buffer_size;
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/* Always create a buffer that is 4 times larger than the maximum seen IB
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* size, aligned to a power of two. Limit to 512k dwords, which is the
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* largest power of two that fits into the size field of the INDIRECT_BUFFER
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* packet.
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/* Always create a buffer that is at least as large as the maximum seen IB
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* size, aligned to a power of two (and multiplied by 4 to reduce internal
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* fragmentation if chaining is not available). Limit to 512k dwords, which
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* is the largest power of two that fits into the size field of the
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* INDIRECT_BUFFER packet.
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*/
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buffer_size = 4 * MIN2(util_next_power_of_two(4 * ib->max_ib_size),
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512 * 1024);
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if (amdgpu_cs_has_chaining(amdgpu_cs_from_ib(ib)->ring_type))
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buffer_size = 4 *util_next_power_of_two(ib->max_ib_size);
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else
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buffer_size = 4 *util_next_power_of_two(4 * ib->max_ib_size);
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buffer_size = MIN2(buffer_size, 4 * 512 * 1024);
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switch (ib->ib_type) {
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case IB_CONST_PREAMBLE:
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@ -436,9 +455,11 @@ static bool amdgpu_get_new_ib(struct radeon_winsys *ws, struct amdgpu_cs *cs,
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unreachable("unhandled IB type");
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}
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ib_size = MAX2(ib_size,
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4 * MIN2(util_next_power_of_two(ib->max_ib_size),
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amdgpu_ib_max_submit_dwords(ib_type)));
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if (!amdgpu_cs_has_chaining(cs->ring_type)) {
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ib_size = MAX2(ib_size,
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4 * MIN2(util_next_power_of_two(ib->max_ib_size),
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amdgpu_ib_max_submit_dwords(ib_type)));
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}
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ib->base.prev_dw = 0;
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ib->base.num_prev = 0;
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@ -454,18 +475,22 @@ static bool amdgpu_get_new_ib(struct radeon_winsys *ws, struct amdgpu_cs *cs,
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info->ib_mc_address = amdgpu_winsys_bo(ib->big_ib_buffer)->va +
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ib->used_ib_space;
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info->size = 0;
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ib->ptr_ib_size = &info->size;
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amdgpu_cs_add_buffer(&cs->main.base, ib->big_ib_buffer,
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RADEON_USAGE_READ, 0, RADEON_PRIO_IB1);
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ib->base.current.buf = (uint32_t*)(ib->ib_mapped + ib->used_ib_space);
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ib_size = ib->big_ib_buffer->size - ib->used_ib_space;
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ib->base.current.max_dw = ib_size / 4;
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ib->base.current.max_dw = ib_size / 4 - amdgpu_cs_epilog_dws(cs->ring_type);
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return true;
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}
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static void amdgpu_ib_finalize(struct amdgpu_ib *ib)
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{
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*ib->ptr_ib_size |= ib->base.current.cdw;
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ib->used_ib_space += ib->base.current.cdw * 4;
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ib->max_ib_size = MAX2(ib->max_ib_size, ib->base.prev_dw + ib->base.current.cdw);
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}
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@ -681,6 +706,8 @@ static bool amdgpu_cs_check_space(struct radeon_winsys_cs *rcs, unsigned dw)
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struct amdgpu_ib *ib = amdgpu_ib(rcs);
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struct amdgpu_cs *cs = amdgpu_cs_from_ib(ib);
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unsigned requested_size = rcs->prev_dw + rcs->current.cdw + dw;
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uint64_t va;
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uint32_t *new_ptr_ib_size;
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assert(rcs->current.cdw <= rcs->current.max_dw);
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@ -689,7 +716,70 @@ static bool amdgpu_cs_check_space(struct radeon_winsys_cs *rcs, unsigned dw)
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ib->max_ib_size = MAX2(ib->max_ib_size, requested_size);
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return rcs->current.max_dw - rcs->current.cdw >= dw;
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if (rcs->current.max_dw - rcs->current.cdw >= dw)
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return true;
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if (!amdgpu_cs_has_chaining(cs->ring_type))
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return false;
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/* Allocate a new chunk */
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if (rcs->num_prev >= rcs->max_prev) {
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unsigned new_max_prev = MAX2(1, 2 * rcs->max_prev);
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struct radeon_winsys_cs_chunk *new_prev;
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new_prev = REALLOC(rcs->prev,
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sizeof(*new_prev) * rcs->max_prev,
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sizeof(*new_prev) * new_max_prev);
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if (!new_prev)
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return false;
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rcs->prev = new_prev;
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rcs->max_prev = new_max_prev;
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}
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if (!amdgpu_ib_new_buffer(cs->ctx->ws, ib))
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return false;
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assert(ib->used_ib_space == 0);
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va = amdgpu_winsys_bo(ib->big_ib_buffer)->va;
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/* This space was originally reserved. */
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rcs->current.max_dw += 4;
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assert(ib->used_ib_space + 4 * rcs->current.max_dw <= ib->big_ib_buffer->size);
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/* Pad with NOPs and add INDIRECT_BUFFER packet */
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while ((rcs->current.cdw & 7) != 4)
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OUT_CS(rcs, 0xffff1000); /* type3 nop packet */
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OUT_CS(rcs, PKT3(ib->ib_type == IB_MAIN ? PKT3_INDIRECT_BUFFER_CIK
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: PKT3_INDIRECT_BUFFER_CONST, 2, 0));
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OUT_CS(rcs, va);
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OUT_CS(rcs, va >> 32);
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new_ptr_ib_size = &rcs->current.buf[rcs->current.cdw];
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OUT_CS(rcs, S_3F2_CHAIN(1) | S_3F2_VALID(1));
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assert((rcs->current.cdw & 7) == 0);
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assert(rcs->current.cdw <= rcs->current.max_dw);
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*ib->ptr_ib_size |= rcs->current.cdw;
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ib->ptr_ib_size = new_ptr_ib_size;
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/* Hook up the new chunk */
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rcs->prev[rcs->num_prev].buf = rcs->current.buf;
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rcs->prev[rcs->num_prev].cdw = rcs->current.cdw;
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rcs->prev[rcs->num_prev].max_dw = rcs->current.cdw; /* no modifications */
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rcs->num_prev++;
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ib->base.prev_dw += ib->base.current.cdw;
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ib->base.current.cdw = 0;
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ib->base.current.buf = (uint32_t*)(ib->ib_mapped + ib->used_ib_space);
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ib->base.current.max_dw = ib->big_ib_buffer->size / 4 - amdgpu_cs_epilog_dws(cs->ring_type);
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amdgpu_cs_add_buffer(&cs->main.base, ib->big_ib_buffer,
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RADEON_USAGE_READ, 0, RADEON_PRIO_IB1);
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return true;
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}
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static boolean amdgpu_cs_memory_below_limit(struct radeon_winsys_cs *rcs, uint64_t vram, uint64_t gtt)
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@ -884,6 +974,8 @@ static void amdgpu_cs_flush(struct radeon_winsys_cs *rcs,
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struct amdgpu_cs *cs = amdgpu_cs(rcs);
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struct amdgpu_winsys *ws = cs->ctx->ws;
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rcs->current.max_dw += amdgpu_cs_epilog_dws(cs->ring_type);
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switch (cs->ring_type) {
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case RING_DMA:
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/* pad DMA ring to 8 DWs */
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@ -924,18 +1016,13 @@ static void amdgpu_cs_flush(struct radeon_winsys_cs *rcs,
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unsigned i, num_buffers = cur->num_buffers;
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/* Set IB sizes. */
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cur->ib[IB_MAIN].size = cs->main.base.current.cdw;
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amdgpu_ib_finalize(&cs->main);
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if (cs->const_ib.ib_mapped) {
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cur->ib[IB_CONST].size = cs->const_ib.base.current.cdw;
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if (cs->const_ib.ib_mapped)
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amdgpu_ib_finalize(&cs->const_ib);
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}
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if (cs->const_preamble_ib.ib_mapped) {
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cur->ib[IB_CONST_PREAMBLE].size = cs->const_preamble_ib.base.current.cdw;
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if (cs->const_preamble_ib.ib_mapped)
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amdgpu_ib_finalize(&cs->const_preamble_ib);
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}
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/* Create a fence. */
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amdgpu_fence_reference(&cur->fence, NULL);
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@ -991,8 +1078,11 @@ static void amdgpu_cs_destroy(struct radeon_winsys_cs *rcs)
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pipe_semaphore_destroy(&cs->flush_completed);
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p_atomic_dec(&cs->ctx->ws->num_cs);
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pb_reference(&cs->main.big_ib_buffer, NULL);
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FREE(cs->main.base.prev);
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pb_reference(&cs->const_ib.big_ib_buffer, NULL);
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FREE(cs->const_ib.base.prev);
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pb_reference(&cs->const_preamble_ib.big_ib_buffer, NULL);
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FREE(cs->const_preamble_ib.base.prev);
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amdgpu_destroy_cs_context(&cs->csc1);
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amdgpu_destroy_cs_context(&cs->csc2);
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FREE(cs);
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@ -65,6 +65,7 @@ struct amdgpu_ib {
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uint8_t *ib_mapped;
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unsigned used_ib_space;
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unsigned max_ib_size;
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uint32_t *ptr_ib_size;
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enum ib_type ib_type;
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};
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