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