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/*
* Copyright © 2008 Intel Corporation
*
* 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, sublicense,
* 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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*
* Authors:
* Eric Anholt <eric@anholt.net>
* Ben Widawsky <ben@bwidawsk.net>
*
*/
#include <unistd.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <err.h>
#include <assert.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include "intel_gpu_tools.h"
void *mmio;
static struct _mmio_data {
int inited;
bool safe;
char debugfs_path[FILENAME_MAX];
char debugfs_forcewake_path[FILENAME_MAX];
uint32_t i915_devid;
int key;
} mmio_data;
void
intel_map_file(char *file)
{
int fd;
struct stat st;
fd = open(file, O_RDWR);
if (fd == -1) {
fprintf(stderr, "Couldn't open %s: %s\n", file,
strerror(errno));
exit(1);
}
fstat(fd, &st);
mmio = mmap(NULL, st.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
if (mmio == MAP_FAILED) {
fprintf(stderr, "Couldn't mmap %s: %s\n", file,
strerror(errno));
exit(1);
}
close(fd);
}
void
intel_get_mmio(struct pci_device *pci_dev)
{
uint32_t devid;
int mmio_bar;
int err;
devid = pci_dev->device_id;
if (IS_GEN2(devid))
mmio_bar = 1;
else
mmio_bar = 0;
err = pci_device_map_range (pci_dev,
pci_dev->regions[mmio_bar].base_addr,
pci_dev->regions[mmio_bar].size,
PCI_DEV_MAP_FLAG_WRITABLE,
&mmio);
if (err != 0) {
fprintf(stderr, "Couldn't map MMIO region: %s\n",
strerror(err));
exit(1);
}
}
/*
* If successful, i915_debugfs_path and i915_debugfs_forcewake_path are both
* updated with the correct path.
*/
static int
find_debugfs_path(char *dri_base)
{
char buf[FILENAME_MAX];
struct stat sb;
int i, ret;
for (i = 0; i < 16; i++) {
snprintf(buf, FILENAME_MAX, "%s/%i/name", dri_base, i);
snprintf(mmio_data.debugfs_path, FILENAME_MAX,
"%s/%i/", dri_base, i);
snprintf(mmio_data.debugfs_forcewake_path, FILENAME_MAX,
"%s/%i/i915_forcewake_user", dri_base, i);
ret = stat(mmio_data.debugfs_forcewake_path, &sb);
if (ret) {
mmio_data.debugfs_path[0] = 0;
mmio_data.debugfs_forcewake_path[0] = 0;
} else
return 0;
}
return -1;
}
static int
get_forcewake_lock(void)
{
return open(mmio_data.debugfs_forcewake_path, 0);
}
static void
release_forcewake_lock(int fd)
{
close(fd);
}
/*
* Initialize register access library.
*
* @pci_dev: pci device we're mucking with
* @safe: use safe register access tables
*/
int
intel_register_access_init(struct pci_device *pci_dev)
{
int ret;
/* after old API is deprecated, remove this */
if (mmio == NULL)
intel_get_mmio(pci_dev);
assert(mmio != NULL);
if (mmio_data.inited)
return -1;
/* Find where the forcewake lock is */
ret = find_debugfs_path("/sys/kernel/debug/dri");
if (ret) {
ret = find_debugfs_path("/debug/dri");
if (ret) {
fprintf(stderr, "Couldn't find path to dri/debugfs entry\n");
return ret;
}
}
mmio_data.i915_devid = pci_dev->device_id;
mmio_data.key = get_forcewake_lock();
mmio_data.inited++;
return 0;
}
void
intel_register_access_fini(void)
{
release_forcewake_lock(mmio_data.key);
mmio_data.inited--;
}
uint32_t
intel_register_read(uint32_t reg)
{
struct intel_register_range *range;
uint32_t ret;
assert(mmio_data.inited);
if (IS_GEN6(mmio_data.i915_devid))
assert(mmio_data.key != -1);
}
void
intel_register_write(uint32_t reg, uint32_t val)
{
struct intel_register_range *range;
assert(mmio_data.inited);
if (IS_GEN6(mmio_data.i915_devid))
assert(mmio_data.key != -1);
*(volatile uint32_t *)((volatile char *)mmio + reg) = val;
}
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