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nouveau_sgdma.c revision 1.1.1.2.30.1 
      1 /*	$NetBSD: nouveau_sgdma.c,v 1.1.1.2.30.1 2018/09/06 06:56:18 pgoyette Exp $	*/
      2 
      3 #include <sys/cdefs.h>
      4 __KERNEL_RCSID(0, "$NetBSD: nouveau_sgdma.c,v 1.1.1.2.30.1 2018/09/06 06:56:18 pgoyette Exp $");
      5 
      6 #include <linux/pagemap.h>
      7 #include <linux/slab.h>
      8 
      9 #include "nouveau_drm.h"
     10 #include "nouveau_ttm.h"
     11 
     12 struct nouveau_sgdma_be {
     13 	/* this has to be the first field so populate/unpopulated in
     14 	 * nouve_bo.c works properly, otherwise have to move them here
     15 	 */
     16 	struct ttm_dma_tt ttm;
     17 	struct nvkm_mem *node;
     18 };
     19 
     20 static void
     21 nouveau_sgdma_destroy(struct ttm_tt *ttm)
     22 {
     23 	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
     24 
     25 	if (ttm) {
     26 		ttm_dma_tt_fini(&nvbe->ttm);
     27 		kfree(nvbe);
     28 	}
     29 }
     30 
     31 static int
     32 nv04_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
     33 {
     34 	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
     35 	struct nvkm_mem *node = mem->mm_node;
     36 
     37 	if (ttm->sg) {
     38 		node->sg    = ttm->sg;
     39 		node->pages = NULL;
     40 	} else {
     41 		node->sg    = NULL;
     42 		node->pages = nvbe->ttm.dma_address;
     43 	}
     44 	node->size = (mem->num_pages << PAGE_SHIFT) >> 12;
     45 
     46 	nvkm_vm_map(&node->vma[0], node);
     47 	nvbe->node = node;
     48 	return 0;
     49 }
     50 
     51 static int
     52 nv04_sgdma_unbind(struct ttm_tt *ttm)
     53 {
     54 	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
     55 	nvkm_vm_unmap(&nvbe->node->vma[0]);
     56 	return 0;
     57 }
     58 
     59 static struct ttm_backend_func nv04_sgdma_backend = {
     60 	.bind			= nv04_sgdma_bind,
     61 	.unbind			= nv04_sgdma_unbind,
     62 	.destroy		= nouveau_sgdma_destroy
     63 };
     64 
     65 static int
     66 nv50_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
     67 {
     68 	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
     69 	struct nvkm_mem *node = mem->mm_node;
     70 
     71 	/* noop: bound in move_notify() */
     72 	if (ttm->sg) {
     73 		node->sg    = ttm->sg;
     74 		node->pages = NULL;
     75 	} else {
     76 		node->sg    = NULL;
     77 		node->pages = nvbe->ttm.dma_address;
     78 	}
     79 	node->size = (mem->num_pages << PAGE_SHIFT) >> 12;
     80 	return 0;
     81 }
     82 
     83 static int
     84 nv50_sgdma_unbind(struct ttm_tt *ttm)
     85 {
     86 	/* noop: unbound in move_notify() */
     87 	return 0;
     88 }
     89 
     90 static struct ttm_backend_func nv50_sgdma_backend = {
     91 	.bind			= nv50_sgdma_bind,
     92 	.unbind			= nv50_sgdma_unbind,
     93 	.destroy		= nouveau_sgdma_destroy
     94 };
     95 
     96 struct ttm_tt *
     97 nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
     98 			 unsigned long size, uint32_t page_flags,
     99 			 struct page *dummy_read_page)
    100 {
    101 	struct nouveau_drm *drm = nouveau_bdev(bdev);
    102 	struct nouveau_sgdma_be *nvbe;
    103 
    104 	nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
    105 	if (!nvbe)
    106 		return NULL;
    107 
    108 	if (drm->device.info.family < NV_DEVICE_INFO_V0_TESLA)
    109 		nvbe->ttm.ttm.func = &nv04_sgdma_backend;
    110 	else
    111 		nvbe->ttm.ttm.func = &nv50_sgdma_backend;
    112 
    113 	if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
    114 		/*
    115 		 * A failing ttm_dma_tt_init() will call ttm_tt_destroy()
    116 		 * and thus our nouveau_sgdma_destroy() hook, so we don't need
    117 		 * to free nvbe here.
    118 		 */
    119 		return NULL;
    120 	return &nvbe->ttm.ttm;
    121 }
    122