From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 151 ++++++++++++++++++++++++++++++ 1 file changed, 151 insertions(+) create mode 100644 drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c (limited to 'drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c') diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c new file mode 100644 index 000000000..393f82e26 --- /dev/null +++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c @@ -0,0 +1,151 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/ + * Author: Rob Clark + */ + +#include +#include + +#include + +#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); +} -- cgit v1.2.3