#include "freedreno_util.h"
#include "fd4_query.h"
+#include "fd4_context.h"
#include "fd4_draw.h"
#include "fd4_format.h"
result->b |= (n > 0);
}
+/*
+ * Time Elapsed Query:
+ *
+ * Note: we could in theory support timestamp queries, but they
+ * won't give sensible results for tilers.
+ */
+
+static void
+time_elapsed_enable(struct fd_context *ctx, struct fd_ringbuffer *ring)
+{
+ /* Right now, the assignment of countable to counter register is
+ * just hard coded. If we start exposing more countables than we
+ * have counters, we will need to be more clever.
+ */
+ fd_wfi(ctx, ring);
+ OUT_PKT0(ring, REG_A4XX_CP_PERFCTR_CP_SEL_0, 1);
+ OUT_RING(ring, CP_ALWAYS_COUNT);
+}
+
+static struct fd_hw_sample *
+time_elapsed_get_sample(struct fd_context *ctx, struct fd_ringbuffer *ring)
+{
+ struct fd_hw_sample *samp = fd_hw_sample_init(ctx, sizeof(uint64_t));
+
+ /* use unused part of vsc_size_mem as scratch space, to avoid
+ * extra allocation:
+ */
+ struct fd_bo *scratch_bo = fd4_context(ctx)->vsc_size_mem;
+ const int sample_off = 128;
+ const int addr_off = sample_off + 8;
+
+ debug_assert(ctx->screen->max_freq > 0);
+
+ /* Basic issue is that we need to read counter value to a relative
+ * destination (with per-tile offset) rather than absolute dest
+ * addr. But there is no pm4 packet that can do that. This is
+ * where it would be *really* nice if we could write our own fw
+ * since afaict implementing the sort of packet we need would be
+ * trivial.
+ *
+ * Instead, we:
+ * (1) CP_REG_TO_MEM to do a 64b copy of counter to scratch buffer
+ * (2) CP_MEM_WRITE to write per-sample offset to scratch buffer
+ * (3) CP_REG_TO_MEM w/ accumulate flag to add the per-tile base
+ * address to the per-sample offset in the scratch buffer
+ * (4) CP_MEM_TO_REG to copy resulting address from steps #2 and #3
+ * to CP_ME_NRT_ADDR
+ * (5) CP_MEM_TO_REG's to copy saved counter value from scratch
+ * buffer to CP_ME_NRT_DATA to trigger the write out to query
+ * result buffer
+ *
+ * Straightforward, right?
+ *
+ * Maybe could swap the order of things in the scratch buffer to
+ * put address first, and copy back to CP_ME_NRT_ADDR+DATA in one
+ * shot, but that's really just polishing a turd..
+ */
+
+ fd_wfi(ctx, ring);
+
+ /* copy sample counter _LO and _HI to scratch: */
+ OUT_PKT3(ring, CP_REG_TO_MEM, 2);
+ OUT_RING(ring, CP_REG_TO_MEM_0_REG(REG_A4XX_RBBM_PERFCTR_CP_0_LO) |
+ CP_REG_TO_MEM_0_64B |
+ CP_REG_TO_MEM_0_CNT(2-1)); /* write 2 regs to mem */
+ OUT_RELOC(ring, scratch_bo, sample_off, 0, 0);
+
+ /* ok... here we really *would* like to use the CP_SET_CONSTANT
+ * mode which can add a constant to value in reg2 and write to
+ * reg1... *but* that only works for banked/context registers,
+ * and CP_ME_NRT_DATA isn't one of those.. so we need to do some
+ * CP math to the scratch buffer instead:
+ *
+ * (note first 8 bytes are counter value, use offset 0x8 for
+ * address calculation)
+ */
+
+ /* per-sample offset to scratch bo: */
+ OUT_PKT3(ring, CP_MEM_WRITE, 2);
+ OUT_RELOC(ring, scratch_bo, addr_off, 0, 0);
+ OUT_RING(ring, samp->offset);
+
+ /* now add to that the per-tile base: */
+ OUT_PKT3(ring, CP_REG_TO_MEM, 2);
+ OUT_RING(ring, CP_REG_TO_MEM_0_REG(HW_QUERY_BASE_REG) |
+ CP_REG_TO_MEM_0_ACCUMULATE |
+ CP_REG_TO_MEM_0_CNT(1-1)); /* readback 1 regs */
+ OUT_RELOC(ring, scratch_bo, addr_off, 0, 0);
+
+ /* now copy that back to CP_ME_NRT_ADDR: */
+ OUT_PKT3(ring, CP_MEM_TO_REG, 2);
+ OUT_RING(ring, REG_A4XX_CP_ME_NRT_ADDR);
+ OUT_RELOC(ring, scratch_bo, addr_off, 0, 0);
+
+ /* and finally, copy sample from scratch buffer to CP_ME_NRT_DATA
+ * to trigger the write to result buffer
+ */
+ OUT_PKT3(ring, CP_MEM_TO_REG, 2);
+ OUT_RING(ring, REG_A4XX_CP_ME_NRT_DATA);
+ OUT_RELOC(ring, scratch_bo, sample_off, 0, 0);
+
+ /* and again to get the value of the _HI reg from scratch: */
+ OUT_PKT3(ring, CP_MEM_TO_REG, 2);
+ OUT_RING(ring, REG_A4XX_CP_ME_NRT_DATA);
+ OUT_RELOC(ring, scratch_bo, sample_off + 0x4, 0, 0);
+
+ /* Sigh.. */
+
+ return samp;
+}
+
+static void
+time_elapsed_accumulate_result(struct fd_context *ctx,
+ const void *start, const void *end,
+ union pipe_query_result *result)
+{
+ uint64_t n = *(uint64_t *)end - *(uint64_t *)start;
+ /* max_freq is in Hz, convert cycle count to ns: */
+ result->u64 += n * 1000000000 / ctx->screen->max_freq;
+}
+
static const struct fd_hw_sample_provider occlusion_counter = {
.query_type = PIPE_QUERY_OCCLUSION_COUNTER,
.active = FD_STAGE_DRAW,
.accumulate_result = occlusion_predicate_accumulate_result,
};
+static const struct fd_hw_sample_provider time_elapsed = {
+ .query_type = PIPE_QUERY_TIME_ELAPSED,
+ .active = FD_STAGE_DRAW,
+ .enable = time_elapsed_enable,
+ .get_sample = time_elapsed_get_sample,
+ .accumulate_result = time_elapsed_accumulate_result,
+};
+
void fd4_query_context_init(struct pipe_context *pctx)
{
fd_hw_query_register_provider(pctx, &occlusion_counter);
fd_hw_query_register_provider(pctx, &occlusion_predicate);
+ fd_hw_query_register_provider(pctx, &time_elapsed);
}
projects / mesa.git / commitdiff