drivers/gpu/drm/nouveau/nouveau_sgdma.c

   1 #include "drmP.h"
   2 #include "nouveau_drv.h"
   3 #include <linux/pagemap.h>
   4 #include <linux/slab.h>
   5
   6 #define NV_CTXDMA_PAGE_SHIFT 12
   7 #define NV_CTXDMA_PAGE_SIZE  (1 << NV_CTXDMA_PAGE_SHIFT)
   8 #define NV_CTXDMA_PAGE_MASK  (NV_CTXDMA_PAGE_SIZE - 1)
   9
  10 struct nouveau_sgdma_be {
  11         struct ttm_backend backend;
  12         struct drm_device *dev;
  13
  14         dma_addr_t *pages;
  15         unsigned nr_pages;
  16
  17         u64 offset;
  18         bool bound;
  19 };
  20
  21 static int
  22 nouveau_sgdma_populate(struct ttm_backend *be, unsigned long num_pages,
  23                        struct page **pages, struct page *dummy_read_page)
  24 {
  25         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
  26         struct drm_device *dev = nvbe->dev;
  27
  28         NV_DEBUG(nvbe->dev, "num_pages = %ld\n", num_pages);
  29
  30         if (nvbe->pages)
  31                 return -EINVAL;
  32
  33         nvbe->pages = kmalloc(sizeof(dma_addr_t) * num_pages, GFP_KERNEL);
  34         if (!nvbe->pages)
  35                 return -ENOMEM;
  36
  37         nvbe->nr_pages = 0;
  38         while (num_pages--) {
  39                 nvbe->pages[nvbe->nr_pages] =
  40                         pci_map_page(dev->pdev, pages[nvbe->nr_pages], 0,
  41                                      PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
  42                 if (pci_dma_mapping_error(dev->pdev,
  43                                           nvbe->pages[nvbe->nr_pages])) {
  44                         be->func->clear(be);
  45                         return -EFAULT;
  46                 }
  47
  48                 nvbe->nr_pages++;
  49         }
  50
  51         return 0;
  52 }
  53
  54 static void
  55 nouveau_sgdma_clear(struct ttm_backend *be)
  56 {
  57         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
  58         struct drm_device *dev;
  59
  60         if (nvbe && nvbe->pages) {
  61                 dev = nvbe->dev;
  62                 NV_DEBUG(dev, "\n");
  63
  64                 if (nvbe->bound)
  65                         be->func->unbind(be);
  66
  67                 while (nvbe->nr_pages--) {
  68                         pci_unmap_page(dev->pdev, nvbe->pages[nvbe->nr_pages],
  69                                        PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
  70                 }
  71                 kfree(nvbe->pages);
  72                 nvbe->pages = NULL;
  73                 nvbe->nr_pages = 0;
  74         }
  75 }
  76
  77 static int
  78 nouveau_sgdma_bind(struct ttm_backend *be, struct ttm_mem_reg *mem)
  79 {
  80         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
  81         struct drm_device *dev = nvbe->dev;
  82         struct drm_nouveau_private *dev_priv = dev->dev_private;
  83         struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
  84         unsigned i, j, pte;
  85
  86         NV_DEBUG(dev, "pg=0x%lx\n", mem->start);
  87
  88         nvbe->offset = mem->start << PAGE_SHIFT;
  89         pte = (nvbe->offset >> NV_CTXDMA_PAGE_SHIFT) + 2;
  90         for (i = 0; i < nvbe->nr_pages; i++) {
  91                 dma_addr_t dma_offset = nvbe->pages[i];
  92                 uint32_t offset_l = lower_32_bits(dma_offset);
  93
  94                 for (j = 0; j < PAGE_SIZE / NV_CTXDMA_PAGE_SIZE; j++, pte++) {
  95                         nv_wo32(gpuobj, (pte * 4) + 0, offset_l | 3);
  96                         dma_offset += NV_CTXDMA_PAGE_SIZE;
  97                 }
  98         }
  99
 100         nvbe->bound = true;
 101         return 0;
 102 }
 103
 104 static int
 105 nouveau_sgdma_unbind(struct ttm_backend *be)
 106 {
 107         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
 108         struct drm_device *dev = nvbe->dev;
 109         struct drm_nouveau_private *dev_priv = dev->dev_private;
 110         struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
 111         unsigned i, j, pte;
 112
 113         NV_DEBUG(dev, "\n");
 114
 115         if (!nvbe->bound)
 116                 return 0;
 117
 118         pte = (nvbe->offset >> NV_CTXDMA_PAGE_SHIFT) + 2;
 119         for (i = 0; i < nvbe->nr_pages; i++) {
 120                 for (j = 0; j < PAGE_SIZE / NV_CTXDMA_PAGE_SIZE; j++, pte++)
 121                         nv_wo32(gpuobj, (pte * 4) + 0, 0x00000000);
 122         }
 123
 124         nvbe->bound = false;
 125         return 0;
 126 }
 127
 128 static void
 129 nouveau_sgdma_destroy(struct ttm_backend *be)
 130 {
 131         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
 132
 133         if (be) {
 134                 NV_DEBUG(nvbe->dev, "\n");
 135
 136                 if (nvbe) {
 137                         if (nvbe->pages)
 138                                 be->func->clear(be);
 139                         kfree(nvbe);
 140                 }
 141         }
 142 }
 143
 144 static int
 145 nv50_sgdma_bind(struct ttm_backend *be, struct ttm_mem_reg *mem)
 146 {
 147         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
 148         struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
 149
 150         nvbe->offset = mem->start << PAGE_SHIFT;
 151
 152         nouveau_vm_map_sg(&dev_priv->gart_info.vma, nvbe->offset,
 153                           nvbe->nr_pages << PAGE_SHIFT, nvbe->pages);
 154         nvbe->bound = true;
 155         return 0;
 156 }
 157
 158 static int
 159 nv50_sgdma_unbind(struct ttm_backend *be)
 160 {
 161         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
 162         struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
 163
 164         if (!nvbe->bound)
 165                 return 0;
 166
 167         nouveau_vm_unmap_at(&dev_priv->gart_info.vma, nvbe->offset,
 168                             nvbe->nr_pages << PAGE_SHIFT);
 169         nvbe->bound = false;
 170         return 0;
 171 }
 172
 173 static struct ttm_backend_func nouveau_sgdma_backend = {
 174         .populate               = nouveau_sgdma_populate,
 175         .clear                  = nouveau_sgdma_clear,
 176         .bind                   = nouveau_sgdma_bind,
 177         .unbind                 = nouveau_sgdma_unbind,
 178         .destroy                = nouveau_sgdma_destroy
 179 };
 180
 181 static struct ttm_backend_func nv50_sgdma_backend = {
 182         .populate               = nouveau_sgdma_populate,
 183         .clear                  = nouveau_sgdma_clear,
 184         .bind                   = nv50_sgdma_bind,
 185         .unbind                 = nv50_sgdma_unbind,
 186         .destroy                = nouveau_sgdma_destroy
 187 };
 188
 189 struct ttm_backend *
 190 nouveau_sgdma_init_ttm(struct drm_device *dev)
 191 {
 192         struct drm_nouveau_private *dev_priv = dev->dev_private;
 193         struct nouveau_sgdma_be *nvbe;
 194
 195         nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
 196         if (!nvbe)
 197                 return NULL;
 198
 199         nvbe->dev = dev;
 200
 201         if (dev_priv->card_type < NV_50)
 202                 nvbe->backend.func = &nouveau_sgdma_backend;
 203         else
 204                 nvbe->backend.func = &nv50_sgdma_backend;
 205         return &nvbe->backend;
 206 }
 207
 208 int
 209 nouveau_sgdma_init(struct drm_device *dev)
 210 {
 211         struct drm_nouveau_private *dev_priv = dev->dev_private;
 212         struct nouveau_gpuobj *gpuobj = NULL;
 213         uint32_t aper_size, obj_size;
 214         int i, ret;
 215
 216         if (dev_priv->card_type < NV_50) {
 217                 if(dev_priv->ramin_rsvd_vram < 2 * 1024 * 1024)
 218                         aper_size = 64 * 1024 * 1024;
 219                 else
 220                         aper_size = 512 * 1024 * 1024;
 221
 222                 obj_size  = (aper_size >> NV_CTXDMA_PAGE_SHIFT) * 4;
 223                 obj_size += 8; /* ctxdma header */
 224
 225                 ret = nouveau_gpuobj_new(dev, NULL, obj_size, 16,
 226                                               NVOBJ_FLAG_ZERO_ALLOC |
 227                                               NVOBJ_FLAG_ZERO_FREE, &gpuobj);
 228                 if (ret) {
 229                         NV_ERROR(dev, "Error creating sgdma object: %d\n", ret);
 230                         return ret;
 231                 }
 232
 233                 nv_wo32(gpuobj, 0, NV_CLASS_DMA_IN_MEMORY |
 234                                    (1 << 12) /* PT present */ |
 235                                    (0 << 13) /* PT *not* linear */ |
 236                                    (0 << 14) /* RW */ |
 237                                    (2 << 16) /* PCI */);
 238                 nv_wo32(gpuobj, 4, aper_size - 1);
 239                 for (i = 2; i < 2 + (aper_size >> 12); i++)
 240                         nv_wo32(gpuobj, i * 4, 0x00000000);
 241
 242                 dev_priv->gart_info.sg_ctxdma = gpuobj;
 243                 dev_priv->gart_info.aper_base = 0;
 244                 dev_priv->gart_info.aper_size = aper_size;
 245         } else
 246         if (dev_priv->chan_vm) {
 247                 ret = nouveau_vm_get(dev_priv->chan_vm, 512 * 1024 * 1024,
 248                                      12, NV_MEM_ACCESS_RW,
 249                                      &dev_priv->gart_info.vma);
 250                 if (ret)
 251                         return ret;
 252
 253                 dev_priv->gart_info.aper_base = dev_priv->gart_info.vma.offset;
 254                 dev_priv->gart_info.aper_size = 512 * 1024 * 1024;
 255         }
 256
 257         dev_priv->gart_info.type      = NOUVEAU_GART_SGDMA;
 258         return 0;
 259 }
 260
 261 void
 262 nouveau_sgdma_takedown(struct drm_device *dev)
 263 {
 264         struct drm_nouveau_private *dev_priv = dev->dev_private;
 265
 266         nouveau_gpuobj_ref(NULL, &dev_priv->gart_info.sg_ctxdma);
 267         nouveau_vm_put(&dev_priv->gart_info.vma);
 268 }
 269
 270 uint32_t
 271 nouveau_sgdma_get_physical(struct drm_device *dev, uint32_t offset)
 272 {
 273         struct drm_nouveau_private *dev_priv = dev->dev_private;
 274         struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
 275         int pte = (offset >> NV_CTXDMA_PAGE_SHIFT) + 2;
 276
 277         BUG_ON(dev_priv->card_type >= NV_50);
 278
 279         return (nv_ro32(gpuobj, 4 * pte) & ~NV_CTXDMA_PAGE_MASK) |
 280                 (offset & NV_CTXDMA_PAGE_MASK);
 281 }