/*
 * Copyright © 2008 Intel Corporation
 * Copyright (c) 2012, Oracle and/or its affiliates. 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, 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>
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <err.h>
#include <assert.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>
#ifdef HAVE_STRUCT_SYSINFO_TOTALRAM
#include <sys/sysinfo.h>
#elif defined(HAVE_SWAPCTL) /* Solaris */
#include <sys/swap.h>
#endif

#include "intel_gpu_tools.h"
#include "i915_drm.h"

uint32_t
intel_get_drm_devid(int fd)
{
	int ret;
	struct drm_i915_getparam gp;
	uint32_t devid;
	char *override;

	override = getenv("INTEL_DEVID_OVERRIDE");
	if (override) {
		devid = strtod(override, NULL);
	} else {
		gp.param = I915_PARAM_CHIPSET_ID;
		gp.value = (int *)&devid;

		ret = ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp, sizeof(gp));
		assert(ret == 0);
	}

	return devid;
}

int intel_gen(uint32_t devid)
{
	if (IS_GEN2(devid))
		return 2;
	if (IS_GEN3(devid))
		return 3;
	if (IS_GEN4(devid))
		return 4;
	if (IS_GEN5(devid))
		return 5;
	if (IS_GEN6(devid))
		return 6;
	if (IS_GEN7(devid))
		return 7;

	return -1;
}

uint64_t
intel_get_total_ram_mb(void)
{
	uint64_t retval;

#ifdef HAVE_STRUCT_SYSINFO_TOTALRAM /* Linux */
	struct sysinfo sysinf;
	int ret;

	ret = sysinfo(&sysinf);
	assert(ret == 0);

	retval = sysinf.totalram;
	retval *= sysinf.mem_unit;
#elif defined(_SC_PAGESIZE) && defined(_SC_PHYS_PAGES) /* Solaris */
	long pagesize, npages;

	pagesize = sysconf(_SC_PAGESIZE);
        npages = sysconf(_SC_PHYS_PAGES);

	retval = (uint64_t) pagesize * npages;
#else
#error "Unknown how to get RAM size for this OS"
#endif

	return retval / (1024*1024);
}

uint64_t
intel_get_total_swap_mb(void)
{
	uint64_t retval;

#ifdef HAVE_STRUCT_SYSINFO_TOTALRAM /* Linux */
	struct sysinfo sysinf;
	int ret;

	ret = sysinfo(&sysinf);
	assert(ret == 0);

	retval = sysinf.totalswap;
	retval *= sysinf.mem_unit;
#elif defined(HAVE_SWAPCTL) /* Solaris */
	long pagesize = sysconf(_SC_PAGESIZE);
	uint64_t totalpages = 0;
	swaptbl_t *swt;
	char *buf;
	int n, i;

	if ((n = swapctl(SC_GETNSWP, NULL)) == -1) {
	    perror("swapctl: GETNSWP");
	    return 0;
	}
	if (n == 0) {
	    /* no error, but no swap devices either */
	    return 0;
	}

	swt = malloc(sizeof(struct swaptable) + (n * sizeof(swapent_t)));
	buf = malloc(n * MAXPATHLEN);
	if (!swt || !buf) {
	    perror("malloc");
	} else {
	    swt->swt_n = n;
	    for (i = 0 ; i < n; i++) {
		swt->swt_ent[i].ste_path = buf + (i * MAXPATHLEN);
	    }

	    if ((n = swapctl(SC_LIST, swt)) == -1) {
		perror("swapctl: LIST");
	    } else {
		for (i = 0; i < swt->swt_n; i++) {
		    totalpages += swt->swt_ent[i].ste_pages;
		}
	    }
	}
	free(swt);
	free(buf);

	retval = (uint64_t) pagesize * totalpages;
#else
#warning "Unknown how to get swap size for this OS"
	return 0;
#endif

	return retval / (1024*1024);
}


/*
 * When testing a port to a new platform, create a standalone test binary
 * by running:
 * cc -o porttest intel_drm.c -I.. -DSTANDALONE_TEST `pkg-config --cflags libdrm`
 * and then running the resulting porttest program.
 */
#ifdef STANDALONE_TEST
void *mmio;

int main(int argc, char **argv)
{
    printf("Total RAM:  %" PRIu64 " Mb\n", intel_get_total_ram_mb());
    printf("Total Swap: %" PRIu64 " Mb\n", intel_get_total_swap_mb());

    return 0;
}
#endif /* STANDALONE_TEST */