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/*
* Copyright 2017 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Authors: Jérôme Glisse <jglisse@redhat.com>
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <strings.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include "compote.h"
#include "compote-uapi.h"
static inline uint32_t nvk_sq_cmd(unsigned subc, unsigned method, unsigned len)
{
return ((method >> 2) & 0x1fff) |
((len & 0xfff) << 16) |
((subc & 0x7) << 13) |
(0x1 << 29);
}
static inline uint32_t nvk_ni_cmd(unsigned subc, unsigned method, unsigned len)
{
return ((method >> 2) & 0x1fff) |
((len & 0xfff) << 16) |
((subc & 0x7) << 13) |
(0x3 << 29);
}
int compote_context_new(compote_context_t **ctxp)
{
struct compote_ioctl_channel_alloc arg;
compote_context_t *ctx;
int fd, ret;
fd = open("/dev/compote", O_RDWR, 0);
if (fd < 0) {
fprintf(stderr, "could not open compote device\n");
return -ENODEV;
}
ctx = calloc(1, sizeof(*ctx));
if (ctx == NULL) {
close(fd);
return -ENOMEM;
}
ctx->channel.id = -1UL;
ctx->fd = fd;
ret = compote_context_ioctl(ctx, COMPOTE_IOCTL_CHAN_ALLOC, &arg);
if (ret) {
compote_context_del(&ctx);
return ret;
}
ctx->channel.id = arg.channel;
*ctxp = ctx;
return 0;
}
void compote_context_del(compote_context_t **ctxp)
{
compote_context_t *ctx = *ctxp;
*ctxp = NULL;
if (ctx->channel.id != -1UL) {
struct compote_ioctl_channel_free arg;
arg.channel = ctx->channel.id;
compote_context_ioctl(ctx, COMPOTE_IOCTL_CHAN_FREE, &arg);
}
close(ctx->fd);
free(ctx);
}
int compote_context_ioctl(compote_context_t *ctx, int command, void *arg)
{
do {
int ret;
ret = ioctl(ctx->fd, command, arg);
if (ret && errno != EINTR) {
printf("ret %d errno %d\n", ret, errno);
return ret;
}
} while (errno == EINTR);
return 0;
}
int compote_mo_new(compote_context_t *ctx, compote_mo_t **mop, uint64_t nbytes)
{
static const unsigned long mask = ~((1UL << 12) - 1);
static unsigned long addr = 1UL << 40;
struct compote_ioctl_mem_alloc arg;
compote_mo_t *mo;
int ret;
if (addr < nbytes) {
return -ENOMEM;
}
*mop = NULL;
mo = calloc(1, sizeof(*mo));
if (mo == NULL) {
return -ENOMEM;
}
arg.nbytes = nbytes;
ret = compote_context_ioctl(ctx, COMPOTE_IOCTL_MEM_ALLOC, &arg);
if (ret) {
free(mo);
return ret;
}
mo->foffset = arg.foffset;
mo->nbytes = nbytes;
do {
if (addr < nbytes) {
mo->ptr = NULL;
compote_mo_del(ctx, &mo);
return -ENOMEM;
}
addr = (addr - nbytes) & mask;
mo->ptr = mmap((void *)addr, mo->nbytes, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_FIXED, ctx->fd, mo->foffset);
} while (mo->ptr == MAP_FAILED);
memset(mo->ptr, 0, mo->nbytes);
*mop = mo;
return 0;
}
void compote_mo_del(compote_context_t *ctx, compote_mo_t **mop)
{
struct compote_ioctl_mem_free arg;
compote_mo_t *mo = *mop;
*mop = NULL;
if (mo == NULL) {
return;
}
arg.foffset = mo->foffset;
munmap(mo->ptr, mo->nbytes);
compote_context_ioctl(ctx, COMPOTE_IOCTL_MEM_FREE, &arg);
free(mo);
}
int compote_context_execute(compote_context_t *ctx,
void *addr, unsigned ndw)
{
struct compote_ioctl_channel_execute arg;
arg.channel = ctx->channel.id;
arg.addr = (unsigned long)addr;
arg.ndw = ndw;
// Must be 32bits aligned
if ((arg.addr & 3)) {
return -EINVAL;
}
return compote_context_ioctl(ctx, COMPOTE_IOCTL_CHAN_EXEC, &arg);
}
int main(int argc, char *argv[])
{
compote_context_t *ctx;
compote_mo_t *mo;
int ret;
ret = compote_context_new(&ctx);
if (ret) {
return ret;
}
ret = compote_mo_new(ctx, &mo, 64 << 10);
if (ret) {
goto out;
}
{
uint32_t *ptr = mo->ptr;
uint32_t *sem = &ptr[128 >> 2];
ptr[128 >> 2] = 0xcafedead;
ptr[0] = nvk_sq_cmd(1, 0x10, 4);
ptr[1] = ((unsigned long)sem) >> 32;
ptr[2] = ((unsigned long)sem) & 0xffffffff;
ptr[3] = 0xdeadcafe;
ptr[4] = 0x00000002;
ret = compote_context_execute(ctx, ptr, 5);
if (ret) {
goto out;
}
for (unsigned c = 0; (c < 10) && (ptr[128 >> 2] != 0xdeadcafe); c++) {
printf("[%4d] = 0x%08x 0x%08x 0x%08x\n", 128 >> 2, sem[0], sem[1], sem[2]);
sleep(1);
}
printf("[%4d] = 0x%08x 0x%08x 0x%08x\n", 128 >> 2, sem[0], sem[1], sem[2]);
}
printf("La compote c'est bon !\n");
out:
compote_mo_del(ctx, &mo);
compote_context_del(&ctx);
return ret;
}
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