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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | // SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/ * Author: Rob Clark <rob.clark@linaro.org> */ #include <linux/dma-buf.h> #include <linux/highmem.h> #include <drm/drm_prime.h> #include "omap_drv.h" MODULE_IMPORT_NS(DMA_BUF); /* ----------------------------------------------------------------------------- * DMABUF Export */ static struct sg_table *omap_gem_map_dma_buf( struct dma_buf_attachment *attachment, enum dma_data_direction dir) { struct drm_gem_object *obj = attachment->dmabuf->priv; struct sg_table *sg; sg = omap_gem_get_sg(obj, dir); if (IS_ERR(sg)) return sg; return sg; } static void omap_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, struct sg_table *sg, enum dma_data_direction dir) { struct drm_gem_object *obj = attachment->dmabuf->priv; omap_gem_put_sg(obj, sg); } static int omap_gem_dmabuf_begin_cpu_access(struct dma_buf *buffer, enum dma_data_direction dir) { struct drm_gem_object *obj = buffer->priv; struct page **pages; if (omap_gem_flags(obj) & OMAP_BO_TILED_MASK) { /* TODO we would need to pin at least part of the buffer to * get de-tiled view. For now just reject it. */ return -ENOMEM; } /* make sure we have the pages: */ return omap_gem_get_pages(obj, &pages, true); } static int omap_gem_dmabuf_end_cpu_access(struct dma_buf *buffer, enum dma_data_direction dir) { struct drm_gem_object *obj = buffer->priv; omap_gem_put_pages(obj); return 0; } static int omap_gem_dmabuf_mmap(struct dma_buf *buffer, struct vm_area_struct *vma) { struct drm_gem_object *obj = buffer->priv; int ret = 0; ret = drm_gem_mmap_obj(obj, omap_gem_mmap_size(obj), vma); if (ret < 0) return ret; return omap_gem_mmap_obj(obj, vma); } static const struct dma_buf_ops omap_dmabuf_ops = { .map_dma_buf = omap_gem_map_dma_buf, .unmap_dma_buf = omap_gem_unmap_dma_buf, .release = drm_gem_dmabuf_release, .begin_cpu_access = omap_gem_dmabuf_begin_cpu_access, .end_cpu_access = omap_gem_dmabuf_end_cpu_access, .mmap = omap_gem_dmabuf_mmap, }; struct dma_buf *omap_gem_prime_export(struct drm_gem_object *obj, int flags) { DEFINE_DMA_BUF_EXPORT_INFO(exp_info); exp_info.ops = &omap_dmabuf_ops; exp_info.size = omap_gem_mmap_size(obj); exp_info.flags = flags; exp_info.priv = obj; exp_info.resv = obj->resv; return drm_gem_dmabuf_export(obj->dev, &exp_info); } /* ----------------------------------------------------------------------------- * DMABUF Import */ struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev, struct dma_buf *dma_buf) { struct dma_buf_attachment *attach; struct drm_gem_object *obj; struct sg_table *sgt; int ret; if (dma_buf->ops == &omap_dmabuf_ops) { obj = dma_buf->priv; if (obj->dev == dev) { /* * Importing dmabuf exported from out own gem increases * refcount on gem itself instead of f_count of dmabuf. */ drm_gem_object_get(obj); return obj; } } attach = dma_buf_attach(dma_buf, dev->dev); if (IS_ERR(attach)) return ERR_CAST(attach); get_dma_buf(dma_buf); sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE); if (IS_ERR(sgt)) { ret = PTR_ERR(sgt); goto fail_detach; } obj = omap_gem_new_dmabuf(dev, dma_buf->size, sgt); if (IS_ERR(obj)) { ret = PTR_ERR(obj); goto fail_unmap; } obj->import_attach = attach; return obj; fail_unmap: dma_buf_unmap_attachment(attach, sgt, DMA_TO_DEVICE); fail_detach: dma_buf_detach(dma_buf, attach); dma_buf_put(dma_buf); return ERR_PTR(ret); } |