diff options
author | Brian Paul <brian.paul@tungstengraphics.com> | 2008-10-15 20:46:43 -0600 |
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committer | Brian Paul <brian.paul@tungstengraphics.com> | 2008-10-15 20:56:55 -0600 |
commit | 0116ee1d1c341726b6ed23c2dddc4515e8a34385 (patch) | |
tree | 33307d93cbb261ebd4b707b53380b371b66937c3 /src/gallium/drivers/cell/ppu/cell_spu.c | |
parent | 1c915b14a545ffb10cc1c98cc69f997b6471617f (diff) |
cell: start some performance measurements
Use the spu_write_decrementer() and spu_read_decrementer() functions to
measure time. Convert to milliseconds according to the system timebase value.
Diffstat (limited to 'src/gallium/drivers/cell/ppu/cell_spu.c')
-rw-r--r-- | src/gallium/drivers/cell/ppu/cell_spu.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/gallium/drivers/cell/ppu/cell_spu.c b/src/gallium/drivers/cell/ppu/cell_spu.c index a6e268b362..28e5e6d706 100644 --- a/src/gallium/drivers/cell/ppu/cell_spu.c +++ b/src/gallium/drivers/cell/ppu/cell_spu.c @@ -53,6 +53,35 @@ struct cell_global_info cell_global; /** + * Scan /proc/cpuinfo to determine the timebase for the system. + * This is used by the SPUs to convert 'decrementer' ticks to seconds. + * There may be a better way to get this value... + */ +static unsigned +get_timebase(void) +{ + FILE *f = fopen("/proc/cpuinfo", "r"); + unsigned timebase; + + assert(f); + while (!feof(f)) { + char line[80]; + fgets(line, sizeof(line), f); + if (strncmp(line, "timebase", 8) == 0) { + char *colon = strchr(line, ':'); + if (colon) { + timebase = atoi(colon + 2); + break; + } + } + } + fclose(f); + + return timebase; +} + + +/** * Write a 1-word message to the given SPE mailbox. */ void @@ -115,6 +144,7 @@ cell_start_spus(struct cell_context *cell) { static boolean one_time_init = FALSE; uint i, j; + uint timebase = get_timebase(); if (one_time_init) { fprintf(stderr, "PPU: Multiple rendering contexts not yet supported " @@ -138,6 +168,7 @@ cell_start_spus(struct cell_context *cell) cell_global.inits[i].id = i; cell_global.inits[i].num_spus = cell->num_spus; cell_global.inits[i].debug_flags = cell->debug_flags; + cell_global.inits[i].inv_timebase = 1000.0f / timebase; for (j = 0; j < CELL_NUM_BUFFERS; j++) { cell_global.inits[i].buffers[j] = cell->buffer[j]; |