drivers/intel/init_driver.c

/*
 * XGL 3-D graphics library
 *
 * Copyright (C) 2014 LunarG, Inc.
 *
 * 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 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:
 *    Courtney Goeltzenleuchter <courtney@lunarg.com>
 */

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

#include <sys/types.h>
#include <sys/stat.h>
#include <assert.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <errno.h>
#include <fnmatch.h>

#include <pciaccess.h>

#include <xf86drm.h>
#include <i915_drm.h>

#include <libudev.h>
#include <dlfcn.h>

#ifdef HAVE_VALGRIND
#include <valgrind.h>
#include <memcheck.h>
#define VG(x) x
#else
#define VG(x)
#endif

#define VG_CLEAR(s) VG(memset(&s, 0, sizeof(s)))

#include "xgl.h"
#include "xglDbg.h"

#include "driver.h"
#include "intel_chipset.h"
#include "gen7_functions.h"

XGL_RESULT XGLAPI GetExtensionSupport(XGL_PHYSICAL_GPU gpu, const XGL_CHAR* pExtName);


#if defined(__WIN32__) && !defined(__CYGWIN__)
#elif defined(__CYGWIN__) && defined(USE_OPENGL32) /* use native windows opengl32 */
#  define ICDENTRY extern
#elif (defined(__GNUC__) && __GNUC__ >= 4) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
#  define ICDENTRY __attribute__((visibility("default")))
#endif /* WIN32 && !CYGWIN */

#define LOADER_DBG_MSG_SIZE 256

/*
 * Global to contain application allocation call-backs
 * and GPU enumeration info.
 */
struct _xgl_config icd_data;

struct icd_msg_callback {
    XGL_DBG_MSG_CALLBACK_FUNCTION func;
    XGL_VOID *data;

    struct icd_msg_callback *next;
};

static XGL_VOID *_xglAlloc(XGL_VOID * pUserData, XGL_SIZE size,
                           XGL_SIZE alignment, XGL_SYSTEM_ALLOC_TYPE allocType)
{
    // TODO: ensure alignment
    // can we use? aligned_alloc(alignment, size);
    return (XGL_VOID *) malloc(size);
}

static XGL_VOID _xglFree(XGL_VOID * pUserData, XGL_VOID * pMem)
{
    free(pMem);
}

static struct icd_msg_callback *icd_msg_callbacks = NULL;

static XGL_RESULT icd_msg_callback_add(XGL_DBG_MSG_CALLBACK_FUNCTION func,
                                       XGL_VOID * data)
{
    struct icd_msg_callback *cb;

    cb = malloc(sizeof(*cb));
    if (!cb)
        return XGL_ERROR_OUT_OF_MEMORY;

    cb->func = func;
    cb->data = data;

    cb->next = icd_msg_callbacks;
    icd_msg_callbacks = cb;

    return XGL_SUCCESS;
}

static XGL_RESULT icd_msg_callback_remove(XGL_DBG_MSG_CALLBACK_FUNCTION func)
{
    struct icd_msg_callback *cb = icd_msg_callbacks;

    /*
     * Find the first match.
     *
     * XXX What if the same callback function is registered more
     * than once?
     */
    while (cb) {
        if (cb->func == func)
            break;
        cb = cb->next;
    }

    if (!cb)
        return XGL_ERROR_INVALID_POINTER;

    free(cb);

    return XGL_SUCCESS;
}

static void icd_msg_callback_clear(void)
{
    struct icd_msg_callback *cb = icd_msg_callbacks;

    cb = icd_msg_callbacks;
    while (cb) {
        struct icd_msg_callback *next = cb->next;
        free(cb);
        cb = next;
    }
}

static void loader_err(XGL_INT msg_code, const char *format, ...)
{
    const struct icd_msg_callback *cb = icd_msg_callbacks;
    char msg[LOADER_DBG_MSG_SIZE];
    va_list ap;
    int ret;

    if (!cb) {
#if 1
        fputs(msg, stderr);
        fputc('\n', stderr);
#endif
        return;
    }

    va_start(ap, format);
    ret = vsnprintf(msg, sizeof(msg), format, ap);
    if (ret >= sizeof(msg) || ret < 0)
        msg[sizeof(msg) - 1] = '\0';
    va_end(ap);

    while (cb) {
        cb->func(0, 0, XGL_NULL_HANDLE, 0, msg_code, (const XGL_CHAR *) msg,
                 cb->data);
        cb = cb->next;
    }
}

ICDENTRY XGL_RESULT XGLAPI xglLoad()
{
    memset(&icd_data, 0, sizeof(icd_data));
    return XGL_SUCCESS;
}

ICDENTRY XGL_RESULT XGLAPI xglUnload()
{
    // TODO: Free resources
   icd_msg_callback_clear();
    return XGL_SUCCESS;
}

ICDENTRY XGL_RESULT XGLAPI xglDbgSetGlobalOption(XGL_DBG_GLOBAL_OPTION dbgOption,
                                                 XGL_SIZE dataSize,
                                                 const XGL_VOID * pData)
{
    return XGL_SUCCESS;
}

ICDENTRY XGL_RESULT XGLAPI xglDbgRegisterMsgCallback(XGL_DBG_MSG_CALLBACK_FUNCTION
                                              pfnMsgCallback,
                                              XGL_VOID * pUserData)
{
    return icd_msg_callback_add(pfnMsgCallback, pUserData);
}

ICDENTRY XGL_RESULT XGLAPI xglDbgUnregisterMsgCallback(XGL_DBG_MSG_CALLBACK_FUNCTION
                                                pfnMsgCallback)
{
    return icd_msg_callback_remove(pfnMsgCallback);
}

static int is_render_node(int fd, struct stat *st)
{
    if (fstat(fd, st))
        return 0;

    if (!S_ISCHR(st->st_mode))
        return 0;

    return st->st_rdev & 0x80;
}

static void init_xgl_dispatch_table(struct icd_dispatch_table *pDispatch)
{
#define LOAD(xglfunc, driverfunc) do {                              \
    pDispatch->xglfunc = driverfunc;                                     \
} while (0)
    LOAD(GetGpuInfo, gen7_GetGpuInfo);
    LOAD(GetExtensionSupport, GetExtensionSupport);
}

static void init_validation_dispatch_table(struct icd_dispatch_table *pDispatch)
{
#define LOAD(xglfunc, driverfunc) do {                              \
    pDispatch->xglfunc = driverfunc;                                     \
} while (0)
    LOAD(GetGpuInfo, gen7_GetGpuInfo);
    LOAD(GetExtensionSupport, GetExtensionSupport);
}

ICDENTRY XGL_RESULT XGLAPI xglInitAndEnumerateGpus(const XGL_APPLICATION_INFO *
                                            pAppInfo,
                                            const XGL_ALLOC_CALLBACKS *
                                            pAllocCb, XGL_UINT maxGpus,
                                            XGL_UINT * pGpuCount,
                                            XGL_PHYSICAL_GPU * pGpus)
{
    struct udev *udev;
    struct udev_enumerate *e;
    struct udev_device *device, *parent;
    struct udev_list_entry *entry;
    const char *pci_id, *path;
    const char *usub, *dnode;
    int fd;
    struct stat st;
    char *pci_glob = "*:*";
    XGL_RESULT ret = XGL_ERROR_UNAVAILABLE;
    XGL_UINT count = 0;
    struct _xgl_device *pXglDev;

    // TODO: Do we need to keep track of previous calls to xglInitAndEnumerageGpus?
    /*
     * xglInitAndEnumerateGpus() can be called multiple times. Calling it more than once
     * forces driver reinitialization.
     */

    if (icd_data.num_gpus > 0) {
        /*
         * When xglInitAndEnumerateGpus() is called multiple times,
         * the same callbacks have to be provided on each invocation.
         * Changing the callbacks on subsequent calls to xglInitAndEnumerateGpus()
         * causes it to fail with XGL_ERROR_INVALID_POINTER error.
         */
        if (icd_data.UserDefinedAlloc
            && (icd_data.xgl_alloc.pfnAlloc != pAllocCb->pfnAlloc
                || icd_data.xgl_alloc.pfnFree != pAllocCb->pfnFree)) {
            // TODO: Do we still re-initialize the structure?
            return XGL_ERROR_INVALID_POINTER;
        }
        // TODO: Free resources and re-initialize
    }
    // TODO: Do we need any other validation for incoming pointers?

    if (pAllocCb != XGL_NULL_HANDLE && pAllocCb->pfnAlloc != XGL_NULL_HANDLE) {
        icd_data.UserDefinedAlloc = XGL_TRUE;
        icd_data.xgl_alloc.pfnAlloc = pAllocCb->pfnAlloc;
        icd_data.xgl_alloc.pfnFree = pAllocCb->pfnFree;
        icd_data.xgl_alloc.pUserData = pAllocCb->pUserData;
    } else {
        icd_data.xgl_alloc.pfnAlloc = _xglAlloc;
        icd_data.xgl_alloc.pfnFree = _xglFree;
        icd_data.xgl_alloc.pUserData = XGL_NULL_HANDLE;
    }

    udev = udev_new();
    if (udev == NULL) {
        loader_err(0, "failed to initialize udev context");
        abort();
    }

    memset(icd_data.gpu_info, 0,
           sizeof(icd_data.gpu_info[XGL_MAX_PHYSICAL_GPUS]));
    memset(icd_data.render_node_list, 0,
           sizeof(icd_data.render_node_list[XGL_MAX_PHYSICAL_GPUS]));

    fd = -1;
    e = udev_enumerate_new(udev);
    udev_enumerate_add_match_subsystem(e, "drm");
    udev_enumerate_scan_devices(e);
    udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
        path = udev_list_entry_get_name(entry);
        device = udev_device_new_from_syspath(udev, path);
        parent = udev_device_get_parent(device);
        usub = udev_device_get_subsystem(parent);
        /* Filter out KMS output devices. */
        if (!usub || (strcmp(usub, "pci") != 0))
            continue;
        pci_id = udev_device_get_property_value(parent, "PCI_ID");
        if (fnmatch(pci_glob, pci_id, 0) != 0)
            continue;
        dnode = udev_device_get_devnode(device);
        fd = open(dnode, O_RDWR);
        if (fd < 0)
            continue;
        if (!is_render_node(fd, &st)) {
            close(fd);
            fd = -1;
            continue;
        }

        pXglDev = &icd_data.gpu_info[count];

        sscanf(pci_id, "%x:%x", &pXglDev->ven_id, &pXglDev->dev_id);
        /*
         * Currently only allowing Ivybridge and Haswell
         */
        if (!IS_HASWELL(pXglDev->dev_id) && !IS_IVYBRIDGE(pXglDev->dev_id)) {
            close(fd);
            fd = -1;
            continue;
        }

        /*
         * We'll keep the fd open for any subsequent
         * xglGetGpuInfo calls.
         */
        pXglDev->fd = fd;
        strncpy(pXglDev->device_path, dnode, XGL_MAX_PHYSICAL_GPU_NAME);
        icd_data.render_node_list[count] = pXglDev;
        init_xgl_dispatch_table(&pXglDev->xgl);
        init_validation_dispatch_table(&pXglDev->validation);
        pXglDev->exec = & pXglDev->xgl;

        ret = XGL_SUCCESS;
        count++;
    }
    icd_data.num_gpus = count;
    udev_enumerate_unref(e);
    udev_unref(udev);

    if (ret == XGL_SUCCESS) {
        *pGpuCount = icd_data.num_gpus;
        memcpy(pGpus, icd_data.render_node_list,
               (icd_data.num_gpus >
                maxGpus ? maxGpus : icd_data.num_gpus) *
               sizeof(XGL_PHYSICAL_GPU));
    }

    return ret;
}

XGL_RESULT XGLAPI GetExtensionSupport(XGL_PHYSICAL_GPU gpu, const XGL_CHAR* pExtName)
{
    // struct _xgl_device *pdev = (struct _xgl_device *) gpu;

    // TODO: Check requested extension

    return XGL_ERROR_INVALID_EXTENSION;
}