drivers/gpu/drm/nouveau/nv50_fb.c

   1 #include "drmP.h"
   2 #include "drm.h"
   3 #include "nouveau_drv.h"
   4 #include "nouveau_drm.h"
   5
   6 int
   7 nv50_fb_init(struct drm_device *dev)
   8 {
   9         struct drm_nouveau_private *dev_priv = dev->dev_private;
  10
  11         /* Not a clue what this is exactly.  Without pointing it at a
  12          * scratch page, VRAM->GART blits with M2MF (as in DDX DFS)
  13          * cause IOMMU "read from address 0" errors (rh#561267)
  14          */
  15         nv_wr32(dev, 0x100c08, dev_priv->gart_info.sg_dummy_bus >> 8);
  16
  17         /* This is needed to get meaningful information from 100c90
  18          * on traps. No idea what these values mean exactly. */
  19         switch (dev_priv->chipset) {
  20         case 0x50:
  21                 nv_wr32(dev, 0x100c90, 0x0707ff);
  22                 break;
  23         case 0xa3:
  24         case 0xa5:
  25         case 0xa8:
  26                 nv_wr32(dev, 0x100c90, 0x0d0fff);
  27                 break;
  28         default:
  29                 nv_wr32(dev, 0x100c90, 0x1d07ff);
  30                 break;
  31         }
  32
  33         return 0;
  34 }
  35
  36 void
  37 nv50_fb_takedown(struct drm_device *dev)
  38 {
  39 }
  40
  41 void
  42 nv50_fb_vm_trap(struct drm_device *dev, int display, const char *name)
  43 {
  44         struct drm_nouveau_private *dev_priv = dev->dev_private;
  45         u32 trap[6], idx, chinst;
  46         int i, ch;
  47
  48         idx = nv_rd32(dev, 0x100c90);
  49         if (!(idx & 0x80000000))
  50                 return;
  51         idx &= 0x00ffffff;
  52
  53         for (i = 0; i < 6; i++) {
  54                 nv_wr32(dev, 0x100c90, idx | i << 24);
  55                 trap[i] = nv_rd32(dev, 0x100c94);
  56         }
  57         nv_wr32(dev, 0x100c90, idx | 0x80000000);
  58
  59         if (!display)
  60                 return;
  61
  62         chinst = (trap[2] << 16) | trap[1];
  63         for (ch = 0; ch < dev_priv->engine.fifo.channels; ch++) {
  64                 struct nouveau_channel *chan = dev_priv->fifos[ch];
  65
  66                 if (!chan || !chan->ramin)
  67                         continue;
  68
  69                 if (chinst == chan->ramin->vinst >> 12)
  70                         break;
  71         }
  72
  73         NV_INFO(dev, "%s - VM: Trapped %s at %02x%04x%04x status %08x "
  74                      "channel %d (0x%08x)\n",
  75                 name, (trap[5] & 0x100 ? "read" : "write"),
  76                 trap[5] & 0xff, trap[4] & 0xffff, trap[3] & 0xffff,
  77                 trap[0], ch, chinst);
  78 }