Home | History | Annotate | Line # | Download | only in nouveau
nouveau_sgdma.c revision 1.1 
      1 #include <linux/pagemap.h>
      2 #include <linux/slab.h>
      3 
      4 #include <subdev/fb.h>
      5 
      6 #include "nouveau_drm.h"
      7 #include "nouveau_ttm.h"
      8 
      9 struct nouveau_sgdma_be {
     10 	/* this has to be the first field so populate/unpopulated in
     11 	 * nouve_bo.c works properly, otherwise have to move them here
     12 	 */
     13 	struct ttm_dma_tt ttm;
     14 	struct drm_device *dev;
     15 	struct nouveau_mem *node;
     16 };
     17 
     18 static void
     19 nouveau_sgdma_destroy(struct ttm_tt *ttm)
     20 {
     21 	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
     22 
     23 	if (ttm) {
     24 		ttm_dma_tt_fini(&nvbe->ttm);
     25 		kfree(nvbe);
     26 	}
     27 }
     28 
     29 static int
     30 nv04_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
     31 {
     32 	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
     33 	struct nouveau_mem *node = mem->mm_node;
     34 
     35 	if (ttm->sg) {
     36 		node->sg    = ttm->sg;
     37 		node->pages = NULL;
     38 	} else {
     39 		node->sg    = NULL;
     40 		node->pages = nvbe->ttm.dma_address;
     41 	}
     42 	node->size = (mem->num_pages << PAGE_SHIFT) >> 12;
     43 
     44 	nouveau_vm_map(&node->vma[0], node);
     45 	nvbe->node = node;
     46 	return 0;
     47 }
     48 
     49 static int
     50 nv04_sgdma_unbind(struct ttm_tt *ttm)
     51 {
     52 	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
     53 	nouveau_vm_unmap(&nvbe->node->vma[0]);
     54 	return 0;
     55 }
     56 
     57 static struct ttm_backend_func nv04_sgdma_backend = {
     58 	.bind			= nv04_sgdma_bind,
     59 	.unbind			= nv04_sgdma_unbind,
     60 	.destroy		= nouveau_sgdma_destroy
     61 };
     62 
     63 static int
     64 nv50_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
     65 {
     66 	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
     67 	struct nouveau_mem *node = mem->mm_node;
     68 
     69 	/* noop: bound in move_notify() */
     70 	if (ttm->sg) {
     71 		node->sg    = ttm->sg;
     72 		node->pages = NULL;
     73 	} else {
     74 		node->sg    = NULL;
     75 		node->pages = nvbe->ttm.dma_address;
     76 	}
     77 	node->size = (mem->num_pages << PAGE_SHIFT) >> 12;
     78 	return 0;
     79 }
     80 
     81 static int
     82 nv50_sgdma_unbind(struct ttm_tt *ttm)
     83 {
     84 	/* noop: unbound in move_notify() */
     85 	return 0;
     86 }
     87 
     88 static struct ttm_backend_func nv50_sgdma_backend = {
     89 	.bind			= nv50_sgdma_bind,
     90 	.unbind			= nv50_sgdma_unbind,
     91 	.destroy		= nouveau_sgdma_destroy
     92 };
     93 
     94 struct ttm_tt *
     95 nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
     96 			 unsigned long size, uint32_t page_flags,
     97 			 struct page *dummy_read_page)
     98 {
     99 	struct nouveau_drm *drm = nouveau_bdev(bdev);
    100 	struct nouveau_sgdma_be *nvbe;
    101 
    102 	nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
    103 	if (!nvbe)
    104 		return NULL;
    105 
    106 	nvbe->dev = drm->dev;
    107 	if (nv_device(drm->device)->card_type < NV_50)
    108 		nvbe->ttm.ttm.func = &nv04_sgdma_backend;
    109 	else
    110 		nvbe->ttm.ttm.func = &nv50_sgdma_backend;
    111 
    112 	if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
    113 		return NULL;
    114 	return &nvbe->ttm.ttm;
    115 }
    116