drm/nouveau: remove dummy page use from PCI(E)GART, use PTE present instead

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

diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index e1619c6..d76d2c0 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -672,8 +672,6 @@ struct drm_nouveau_private {
                uint64_t aper_free;
 
                struct nouveau_gpuobj *sg_ctxdma;
-               struct page *sg_dummy_page;
-               dma_addr_t sg_dummy_bus;
        } gart_info;
 
        /* nv10-nv40 tiling regions */

diff --git a/drivers/gpu/drm/nouveau/nouveau_sgdma.c b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
index d4ac970..54af760 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_sgdma.c
+++ b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
@@ -144,19 +144,15 @@ nouveau_sgdma_unbind(struct ttm_backend *be)
 
        pte = nvbe->pte_start;
        for (i = 0; i < nvbe->nr_pages; i++) {
-               dma_addr_t dma_offset = dev_priv->gart_info.sg_dummy_bus;
-
                for (j = 0; j < PAGE_SIZE / NV_CTXDMA_PAGE_SIZE; j++) {
                        if (dev_priv->card_type < NV_50) {
-                               nv_wo32(gpuobj, (pte * 4) + 0, dma_offset | 3);
+                               nv_wo32(gpuobj, (pte * 4) + 0, 0x00000000);
                                pte += 1;
                        } else {
                                nv_wo32(gpuobj, (pte * 4) + 0, 0x00000000);
                                nv_wo32(gpuobj, (pte * 4) + 4, 0x00000000);
                                pte += 2;
                        }
-
-                       dma_offset += NV_CTXDMA_PAGE_SIZE;
                }
        }
        dev_priv->engine.instmem.flush(nvbe->dev);
@@ -218,7 +214,6 @@ int
 nouveau_sgdma_init(struct drm_device *dev)
 {
        struct drm_nouveau_private *dev_priv = dev->dev_private;
-       struct pci_dev *pdev = dev->pdev;
        struct nouveau_gpuobj *gpuobj = NULL;
        uint32_t aper_size, obj_size;
        int i, ret;
@@ -245,22 +240,6 @@ nouveau_sgdma_init(struct drm_device *dev)
                return ret;
        }
 
-       dev_priv->gart_info.sg_dummy_page =
-               alloc_page(GFP_KERNEL|__GFP_DMA32|__GFP_ZERO);
-       if (!dev_priv->gart_info.sg_dummy_page) {
-               nouveau_gpuobj_ref(NULL, &gpuobj);
-               return -ENOMEM;
-       }
-
-       set_bit(PG_locked, &dev_priv->gart_info.sg_dummy_page->flags);
-       dev_priv->gart_info.sg_dummy_bus =
-               pci_map_page(pdev, dev_priv->gart_info.sg_dummy_page, 0,
-                            PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
-       if (pci_dma_mapping_error(pdev, dev_priv->gart_info.sg_dummy_bus)) {
-               nouveau_gpuobj_ref(NULL, &gpuobj);
-               return -EFAULT;
-       }
-
        if (dev_priv->card_type < NV_50) {
                /* special case, allocated from global instmem heap so
                 * cinst is invalid, we use it on all channels though so
@@ -277,10 +256,8 @@ nouveau_sgdma_init(struct drm_device *dev)
                                   (NV_DMA_ACCESS_RW  << 14) |
                                   (NV_DMA_TARGET_PCI << 16));
                nv_wo32(gpuobj, 4, aper_size - 1);
-               for (i = 2; i < 2 + (aper_size >> 12); i++) {
-                       nv_wo32(gpuobj, i * 4,
-                               dev_priv->gart_info.sg_dummy_bus | 3);
-               }
+               for (i = 2; i < 2 + (aper_size >> 12); i++)
+                       nv_wo32(gpuobj, i * 4, 0x00000000);
        } else {
                for (i = 0; i < obj_size; i += 8) {
                        nv_wo32(gpuobj, i + 0, 0x00000000);
@@ -301,15 +278,6 @@ nouveau_sgdma_takedown(struct drm_device *dev)
 {
        struct drm_nouveau_private *dev_priv = dev->dev_private;
 
-       if (dev_priv->gart_info.sg_dummy_page) {
-               pci_unmap_page(dev->pdev, dev_priv->gart_info.sg_dummy_bus,
-                              NV_CTXDMA_PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
-               unlock_page(dev_priv->gart_info.sg_dummy_page);
-               __free_page(dev_priv->gart_info.sg_dummy_page);
-               dev_priv->gart_info.sg_dummy_page = NULL;
-               dev_priv->gart_info.sg_dummy_bus = 0;
-       }
-
        nouveau_gpuobj_ref(NULL, &dev_priv->gart_info.sg_ctxdma);
 }