src/gallium/winsys/nouveau/drm/nouveau_drm_winsys.c

   1 #include <sys/stat.h>
   2 #include <unistd.h>
   3 #include <fcntl.h>
   4 #include "pipe/p_context.h"
   5 #include "pipe/p_state.h"
   6 #include "util/format/u_format.h"
   7 #include "util/u_memory.h"
   8 #include "util/u_inlines.h"
   9 #include "util/u_hash_table.h"
  10 #include "util/u_pointer.h"
  11 #include "os/os_thread.h"
  12
  13 #include "nouveau_drm_public.h"
  14
  15 #include "nouveau/nouveau_winsys.h"
  16 #include "nouveau/nouveau_screen.h"
  17
  18 #include <nvif/class.h>
  19 #include <nvif/cl0080.h>
  20
  21 static struct hash_table *fd_tab = NULL;
  22
  23 static mtx_t nouveau_screen_mutex = _MTX_INITIALIZER_NP;
  24
  25 bool nouveau_drm_screen_unref(struct nouveau_screen *screen)
  26 {
  27         int ret;
  28         if (screen->refcount == -1)
  29                 return true;
  30
  31         mtx_lock(&nouveau_screen_mutex);
  32         ret = --screen->refcount;
  33         assert(ret >= 0);
  34         if (ret == 0)
  35                 _mesa_hash_table_remove_key(fd_tab, intptr_to_pointer(screen->drm->fd));
  36         mtx_unlock(&nouveau_screen_mutex);
  37         return ret == 0;
  38 }
  39
  40 PUBLIC struct pipe_screen *
  41 nouveau_drm_screen_create(int fd)
  42 {
  43         struct nouveau_drm *drm = NULL;
  44         struct nouveau_device *dev = NULL;
  45         struct nouveau_screen *(*init)(struct nouveau_device *);
  46         struct nouveau_screen *screen = NULL;
  47         int ret, dupfd;
  48
  49         mtx_lock(&nouveau_screen_mutex);
  50         if (!fd_tab) {
  51                 fd_tab = util_hash_table_create_fd_keys();
  52                 if (!fd_tab) {
  53                         mtx_unlock(&nouveau_screen_mutex);
  54                         return NULL;
  55                 }
  56         }
  57
  58         screen = util_hash_table_get(fd_tab, intptr_to_pointer(fd));
  59         if (screen) {
  60                 screen->refcount++;
  61                 mtx_unlock(&nouveau_screen_mutex);
  62                 return &screen->base;
  63         }
  64
  65         /* Since the screen re-use is based on the device node and not the fd,
  66          * create a copy of the fd to be owned by the device. Otherwise a
  67          * scenario could occur where two screens are created, and the first
  68          * one is shut down, along with the fd being closed. The second
  69          * (identical) screen would now have a reference to the closed fd. We
  70          * avoid this by duplicating the original fd. Note that
  71          * nouveau_device_wrap does not close the fd in case of a device
  72          * creation error.
  73          */
  74         dupfd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
  75
  76         ret = nouveau_drm_new(dupfd, &drm);
  77         if (ret)
  78                 goto err;
  79
  80         ret = nouveau_device_new(&drm->client, NV_DEVICE,
  81                                  &(struct nv_device_v0) {
  82                                         .device = ~0ULL,
  83                                  }, sizeof(struct nv_device_v0), &dev);
  84         if (ret)
  85                 goto err;
  86
  87         switch (dev->chipset & ~0xf) {
  88         case 0x30:
  89         case 0x40:
  90         case 0x60:
  91                 init = nv30_screen_create;
  92                 break;
  93         case 0x50:
  94         case 0x80:
  95         case 0x90:
  96         case 0xa0:
  97                 init = nv50_screen_create;
  98                 break;
  99         case 0xc0:
 100         case 0xd0:
 101         case 0xe0:
 102         case 0xf0:
 103         case 0x100:
 104         case 0x110:
 105         case 0x120:
 106         case 0x130:
 107                 init = nvc0_screen_create;
 108                 break;
 109         default:
 110                 debug_printf("%s: unknown chipset nv%02x\n", __func__,
 111                              dev->chipset);
 112                 goto err;
 113         }
 114
 115         screen = init(dev);
 116         if (!screen || !screen->base.context_create)
 117                 goto err;
 118
 119         /* Use dupfd in hash table, to avoid errors if the original fd gets
 120          * closed by its owner. The hash key needs to live at least as long as
 121          * the screen.
 122          */
 123         _mesa_hash_table_insert(fd_tab, intptr_to_pointer(dupfd), screen);
 124         screen->refcount = 1;
 125         mtx_unlock(&nouveau_screen_mutex);
 126         return &screen->base;
 127
 128 err:
 129         if (screen) {
 130                 screen->base.destroy(&screen->base);
 131         } else {
 132                 nouveau_device_del(&dev);
 133                 nouveau_drm_del(&drm);
 134                 close(dupfd);
 135         }
 136         mtx_unlock(&nouveau_screen_mutex);
 137         return NULL;
 138 }