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/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/**
* Utility/wrappers for communicating with the SPUs.
*/
#include <pthread.h>
#include "cell_spu.h"
#include "pipe/p_format.h"
#include "pipe/p_state.h"
#include "util/u_memory.h"
#include "cell/common.h"
/*
helpful headers:
/opt/ibm/cell-sdk/prototype/src/include/ppu/cbe_mfc.h
*/
/**
* Cell/SPU info that's not per-context.
*/
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
send_mbox_message(spe_context_ptr_t ctx, unsigned int msg)
{
spe_in_mbox_write(ctx, &msg, 1, SPE_MBOX_ALL_BLOCKING);
}
/**
* Wait for a 1-word message to arrive in given mailbox.
*/
uint
wait_mbox_message(spe_context_ptr_t ctx)
{
do {
unsigned data;
int count = spe_out_mbox_read(ctx, &data, 1);
if (count == 1) {
return data;
}
if (count < 0) {
/* error */ ;
}
} while (1);
}
/**
* Called by pthread_create() to spawn an SPU thread.
*/
static void *
cell_thread_function(void *arg)
{
struct cell_init_info *init = (struct cell_init_info *) arg;
unsigned entry = SPE_DEFAULT_ENTRY;
ASSERT_ALIGN16(init);
if (spe_context_run(cell_global.spe_contexts[init->id], &entry, 0,
init, NULL, NULL) < 0) {
fprintf(stderr, "spe_context_run() failed\n");
exit(1);
}
pthread_exit(NULL);
}
/**
* Create the SPU threads. This is done once during driver initialization.
* This involves setting the the "init" message which is sent to each SPU.
* The init message specifies an SPU id, total number of SPUs, location
* and number of batch buffers, etc.
*/
void
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 "
"on Cell.\n");
abort();
}
one_time_init = TRUE;
assert(cell->num_spus <= CELL_MAX_SPUS);
ASSERT_ALIGN16(&cell_global.inits[0]);
ASSERT_ALIGN16(&cell_global.inits[1]);
/*
* Initialize the global 'inits' structure for each SPU.
* A pointer to the init struct will be passed to each SPU.
* The SPUs will then each grab their init info with mfc_get().
*/
for (i = 0; i < cell->num_spus; i++) {
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];
}
cell_global.inits[i].buffer_status = &cell->buffer_status[0][0][0];
cell_global.inits[i].spu_functions = &cell->spu_functions;
cell_global.spe_contexts[i] = spe_context_create(0, NULL);
if (!cell_global.spe_contexts[i]) {
fprintf(stderr, "spe_context_create() failed\n");
exit(1);
}
if (spe_program_load(cell_global.spe_contexts[i], &g3d_spu)) {
fprintf(stderr, "spe_program_load() failed\n");
exit(1);
}
pthread_create(&cell_global.spe_threads[i], /* returned thread handle */
NULL, /* pthread attribs */
&cell_thread_function, /* start routine */
&cell_global.inits[i]); /* thread argument */
}
}
/**
* Tell all the SPUs to stop/exit.
* This is done when the driver's exiting / cleaning up.
*/
void
cell_spu_exit(struct cell_context *cell)
{
uint i;
for (i = 0; i < cell->num_spus; i++) {
send_mbox_message(cell_global.spe_contexts[i], CELL_CMD_EXIT);
}
/* wait for threads to exit */
for (i = 0; i < cell->num_spus; i++) {
void *value;
pthread_join(cell_global.spe_threads[i], &value);
cell_global.spe_threads[i] = 0;
cell_global.spe_contexts[i] = 0;
}
}
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