drm/nvc0/fb: allocate page for some unknown PFFB object

Fixes DMAR faults during accel, more than likely a similar problem to what
was solved on nv50 previously.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 66 insertions, 2 deletions

diff --git a/drivers/gpu/drm/nouveau/nvc0_fb.c b/drivers/gpu/drm/nouveau/nvc0_fb.c
index 26a996025dd2..08e6b118f021 100644
--- a/drivers/gpu/drm/nouveau/nvc0_fb.c
+++ b/drivers/gpu/drm/nouveau/nvc0_fb.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010 Red Hat Inc.
+ * Copyright 2011 Red Hat Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -23,16 +23,80 @@
  */
 
 #include "drmP.h"
-
+#include "drm.h"
 #include "nouveau_drv.h"
+#include "nouveau_drm.h"
+
+struct nvc0_fb_priv {
+        struct page *r100c10_page;
+        dma_addr_t r100c10;
+};
+
+static void
+nvc0_fb_destroy(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_fb_engine *pfb = &dev_priv->engine.fb;
+        struct nvc0_fb_priv *priv = pfb->priv;
+
+        if (priv->r100c10_page) {
+                pci_unmap_page(dev->pdev, priv->r100c10, PAGE_SIZE,
+                               PCI_DMA_BIDIRECTIONAL);
+                __free_page(priv->r100c10_page);
+        }
+
+        kfree(priv);
+        pfb->priv = NULL;
+}
+
+static int
+nvc0_fb_create(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_fb_engine *pfb = &dev_priv->engine.fb;
+        struct nvc0_fb_priv *priv;
+
+        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+        pfb->priv = priv;
+
+        priv->r100c10_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+        if (!priv->r100c10_page) {
+                nvc0_fb_destroy(dev);
+                return -ENOMEM;
+        }
+
+        priv->r100c10 = pci_map_page(dev->pdev, priv->r100c10_page, 0,
+                                     PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+        if (pci_dma_mapping_error(dev->pdev, priv->r100c10)) {
+                nvc0_fb_destroy(dev);
+                return -EFAULT;
+        }
+
+        return 0;
+}
 
 int
 nvc0_fb_init(struct drm_device *dev)
 {
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nvc0_fb_priv *priv;
+        int ret;
+
+        if (!dev_priv->engine.fb.priv) {
+                ret = nvc0_fb_create(dev);
+                if (ret)
+                        return ret;
+        }
+        priv = dev_priv->engine.fb.priv;
+
+        nv_wr32(dev, 0x100c10, priv->r100c10 >> 8);
         return 0;
 }
 
 void
 nvc0_fb_takedown(struct drm_device *dev)
 {
+        nvc0_fb_destroy(dev);
 }