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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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69fdf4206a
If the ioctl is not supported on a particular piece of HW/driver combination, report ENOTSUP (aka EOPNOTSUPP) so that it can be easily distinguished from both the lack of the ioctl and from a regular invalid parameter. v2: Across all the kms ioctls we had a mixture of reporting EINVAL, ENODEV and a few ENOTSUPP (most where EINVAL) for a failed drm_core_check_feature(). Update everybody to report ENOTSUPP. v3: ENOTSUPP is an internal errno! It's value (524) does not correspond to a POSIX errno, the one we want is ENOTSUP. However, uapi/asm-generic/errno.h doesn't include ENOTSUP but man errno says "ENOTSUP and EOPNOTSUPP have the same value on Linux, but according to POSIX.1 these error values should be distinct." so use EOPNOTSUPP as its equivalent. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> #v2 Link: https://patchwork.freedesktop.org/patch/msgid/20180913192050.24812-1-chris@chris-wilson.co.uk
984 lines
27 KiB
C
984 lines
27 KiB
C
/*
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* Copyright © 2012 Red Hat
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Dave Airlie <airlied@redhat.com>
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* Rob Clark <rob.clark@linaro.org>
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*
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*/
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#include <linux/export.h>
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#include <linux/dma-buf.h>
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#include <linux/rbtree.h>
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#include <drm/drm_prime.h>
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#include <drm/drm_gem.h>
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#include <drm/drmP.h>
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#include "drm_internal.h"
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/*
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* DMA-BUF/GEM Object references and lifetime overview:
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*
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* On the export the dma_buf holds a reference to the exporting GEM
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* object. It takes this reference in handle_to_fd_ioctl, when it
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* first calls .prime_export and stores the exporting GEM object in
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* the dma_buf priv. This reference needs to be released when the
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* final reference to the &dma_buf itself is dropped and its
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* &dma_buf_ops.release function is called. For GEM-based drivers,
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* the dma_buf should be exported using drm_gem_dmabuf_export() and
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* then released by drm_gem_dmabuf_release().
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*
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* On the import the importing GEM object holds a reference to the
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* dma_buf (which in turn holds a ref to the exporting GEM object).
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* It takes that reference in the fd_to_handle ioctl.
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* It calls dma_buf_get, creates an attachment to it and stores the
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* attachment in the GEM object. When this attachment is destroyed
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* when the imported object is destroyed, we remove the attachment
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* and drop the reference to the dma_buf.
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*
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* When all the references to the &dma_buf are dropped, i.e. when
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* userspace has closed both handles to the imported GEM object (through the
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* FD_TO_HANDLE IOCTL) and closed the file descriptor of the exported
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* (through the HANDLE_TO_FD IOCTL) dma_buf, and all kernel-internal references
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* are also gone, then the dma_buf gets destroyed. This can also happen as a
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* part of the clean up procedure in the drm_release() function if userspace
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* fails to properly clean up. Note that both the kernel and userspace (by
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* keeeping the PRIME file descriptors open) can hold references onto a
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* &dma_buf.
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*
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* Thus the chain of references always flows in one direction
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* (avoiding loops): importing_gem -> dmabuf -> exporting_gem
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*
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* Self-importing: if userspace is using PRIME as a replacement for flink
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* then it will get a fd->handle request for a GEM object that it created.
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* Drivers should detect this situation and return back the gem object
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* from the dma-buf private. Prime will do this automatically for drivers that
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* use the drm_gem_prime_{import,export} helpers.
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*
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* GEM struct &dma_buf_ops symbols are now exported. They can be resued by
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* drivers which implement GEM interface.
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*/
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struct drm_prime_member {
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struct dma_buf *dma_buf;
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uint32_t handle;
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struct rb_node dmabuf_rb;
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struct rb_node handle_rb;
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};
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struct drm_prime_attachment {
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struct sg_table *sgt;
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enum dma_data_direction dir;
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};
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static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv,
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struct dma_buf *dma_buf, uint32_t handle)
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{
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struct drm_prime_member *member;
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struct rb_node **p, *rb;
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member = kmalloc(sizeof(*member), GFP_KERNEL);
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if (!member)
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return -ENOMEM;
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get_dma_buf(dma_buf);
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member->dma_buf = dma_buf;
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member->handle = handle;
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rb = NULL;
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p = &prime_fpriv->dmabufs.rb_node;
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while (*p) {
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struct drm_prime_member *pos;
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rb = *p;
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pos = rb_entry(rb, struct drm_prime_member, dmabuf_rb);
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if (dma_buf > pos->dma_buf)
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p = &rb->rb_right;
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else
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p = &rb->rb_left;
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}
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rb_link_node(&member->dmabuf_rb, rb, p);
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rb_insert_color(&member->dmabuf_rb, &prime_fpriv->dmabufs);
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rb = NULL;
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p = &prime_fpriv->handles.rb_node;
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while (*p) {
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struct drm_prime_member *pos;
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rb = *p;
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pos = rb_entry(rb, struct drm_prime_member, handle_rb);
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if (handle > pos->handle)
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p = &rb->rb_right;
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else
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p = &rb->rb_left;
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}
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rb_link_node(&member->handle_rb, rb, p);
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rb_insert_color(&member->handle_rb, &prime_fpriv->handles);
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return 0;
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}
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static struct dma_buf *drm_prime_lookup_buf_by_handle(struct drm_prime_file_private *prime_fpriv,
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uint32_t handle)
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{
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struct rb_node *rb;
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rb = prime_fpriv->handles.rb_node;
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while (rb) {
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struct drm_prime_member *member;
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member = rb_entry(rb, struct drm_prime_member, handle_rb);
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if (member->handle == handle)
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return member->dma_buf;
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else if (member->handle < handle)
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rb = rb->rb_right;
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else
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rb = rb->rb_left;
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}
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return NULL;
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}
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static int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpriv,
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struct dma_buf *dma_buf,
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uint32_t *handle)
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{
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struct rb_node *rb;
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rb = prime_fpriv->dmabufs.rb_node;
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while (rb) {
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struct drm_prime_member *member;
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member = rb_entry(rb, struct drm_prime_member, dmabuf_rb);
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if (member->dma_buf == dma_buf) {
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*handle = member->handle;
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return 0;
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} else if (member->dma_buf < dma_buf) {
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rb = rb->rb_right;
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} else {
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rb = rb->rb_left;
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}
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}
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return -ENOENT;
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}
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/**
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* drm_gem_map_attach - dma_buf attach implementation for GEM
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* @dma_buf: buffer to attach device to
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* @attach: buffer attachment data
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*
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* Allocates &drm_prime_attachment and calls &drm_driver.gem_prime_pin for
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* device specific attachment. This can be used as the &dma_buf_ops.attach
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* callback.
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*
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* Returns 0 on success, negative error code on failure.
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*/
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int drm_gem_map_attach(struct dma_buf *dma_buf,
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struct dma_buf_attachment *attach)
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{
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struct drm_prime_attachment *prime_attach;
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struct drm_gem_object *obj = dma_buf->priv;
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struct drm_device *dev = obj->dev;
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prime_attach = kzalloc(sizeof(*prime_attach), GFP_KERNEL);
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if (!prime_attach)
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return -ENOMEM;
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prime_attach->dir = DMA_NONE;
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attach->priv = prime_attach;
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if (!dev->driver->gem_prime_pin)
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return 0;
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return dev->driver->gem_prime_pin(obj);
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}
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EXPORT_SYMBOL(drm_gem_map_attach);
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/**
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* drm_gem_map_detach - dma_buf detach implementation for GEM
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* @dma_buf: buffer to detach from
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* @attach: attachment to be detached
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*
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* Cleans up &dma_buf_attachment. This can be used as the &dma_buf_ops.detach
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* callback.
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*/
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void drm_gem_map_detach(struct dma_buf *dma_buf,
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struct dma_buf_attachment *attach)
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{
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struct drm_prime_attachment *prime_attach = attach->priv;
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struct drm_gem_object *obj = dma_buf->priv;
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struct drm_device *dev = obj->dev;
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if (prime_attach) {
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struct sg_table *sgt = prime_attach->sgt;
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if (sgt) {
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if (prime_attach->dir != DMA_NONE)
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dma_unmap_sg_attrs(attach->dev, sgt->sgl,
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sgt->nents,
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prime_attach->dir,
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DMA_ATTR_SKIP_CPU_SYNC);
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sg_free_table(sgt);
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}
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kfree(sgt);
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kfree(prime_attach);
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attach->priv = NULL;
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}
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if (dev->driver->gem_prime_unpin)
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dev->driver->gem_prime_unpin(obj);
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}
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EXPORT_SYMBOL(drm_gem_map_detach);
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void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv,
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struct dma_buf *dma_buf)
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{
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struct rb_node *rb;
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rb = prime_fpriv->dmabufs.rb_node;
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while (rb) {
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struct drm_prime_member *member;
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member = rb_entry(rb, struct drm_prime_member, dmabuf_rb);
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if (member->dma_buf == dma_buf) {
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rb_erase(&member->handle_rb, &prime_fpriv->handles);
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rb_erase(&member->dmabuf_rb, &prime_fpriv->dmabufs);
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dma_buf_put(dma_buf);
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kfree(member);
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return;
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} else if (member->dma_buf < dma_buf) {
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rb = rb->rb_right;
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} else {
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rb = rb->rb_left;
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}
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}
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}
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/**
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* drm_gem_map_dma_buf - map_dma_buf implementation for GEM
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* @attach: attachment whose scatterlist is to be returned
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* @dir: direction of DMA transfer
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*
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* Calls &drm_driver.gem_prime_get_sg_table and then maps the scatterlist. This
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* can be used as the &dma_buf_ops.map_dma_buf callback.
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*
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* Returns sg_table containing the scatterlist to be returned; returns ERR_PTR
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* on error. May return -EINTR if it is interrupted by a signal.
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*/
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struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
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enum dma_data_direction dir)
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{
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struct drm_prime_attachment *prime_attach = attach->priv;
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struct drm_gem_object *obj = attach->dmabuf->priv;
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struct sg_table *sgt;
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if (WARN_ON(dir == DMA_NONE || !prime_attach))
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return ERR_PTR(-EINVAL);
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/* return the cached mapping when possible */
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if (prime_attach->dir == dir)
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return prime_attach->sgt;
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/*
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* two mappings with different directions for the same attachment are
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* not allowed
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*/
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if (WARN_ON(prime_attach->dir != DMA_NONE))
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return ERR_PTR(-EBUSY);
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sgt = obj->dev->driver->gem_prime_get_sg_table(obj);
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if (!IS_ERR(sgt)) {
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if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
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DMA_ATTR_SKIP_CPU_SYNC)) {
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sg_free_table(sgt);
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kfree(sgt);
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sgt = ERR_PTR(-ENOMEM);
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} else {
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prime_attach->sgt = sgt;
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prime_attach->dir = dir;
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}
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}
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return sgt;
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}
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EXPORT_SYMBOL(drm_gem_map_dma_buf);
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/**
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* drm_gem_unmap_dma_buf - unmap_dma_buf implementation for GEM
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* @attach: attachment to unmap buffer from
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* @sgt: scatterlist info of the buffer to unmap
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* @dir: direction of DMA transfer
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*
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* Not implemented. The unmap is done at drm_gem_map_detach(). This can be
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* used as the &dma_buf_ops.unmap_dma_buf callback.
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*/
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void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
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struct sg_table *sgt,
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enum dma_data_direction dir)
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{
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/* nothing to be done here */
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}
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EXPORT_SYMBOL(drm_gem_unmap_dma_buf);
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/**
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* drm_gem_dmabuf_export - dma_buf export implementation for GEM
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* @dev: parent device for the exported dmabuf
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* @exp_info: the export information used by dma_buf_export()
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*
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* This wraps dma_buf_export() for use by generic GEM drivers that are using
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* drm_gem_dmabuf_release(). In addition to calling dma_buf_export(), we take
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* a reference to the &drm_device and the exported &drm_gem_object (stored in
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* &dma_buf_export_info.priv) which is released by drm_gem_dmabuf_release().
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*
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* Returns the new dmabuf.
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*/
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struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev,
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struct dma_buf_export_info *exp_info)
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{
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struct dma_buf *dma_buf;
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dma_buf = dma_buf_export(exp_info);
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if (IS_ERR(dma_buf))
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return dma_buf;
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drm_dev_get(dev);
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drm_gem_object_get(exp_info->priv);
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return dma_buf;
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_export);
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/**
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* drm_gem_dmabuf_release - dma_buf release implementation for GEM
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* @dma_buf: buffer to be released
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*
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* Generic release function for dma_bufs exported as PRIME buffers. GEM drivers
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* must use this in their dma_buf ops structure as the release callback.
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* drm_gem_dmabuf_release() should be used in conjunction with
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* drm_gem_dmabuf_export().
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*/
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void drm_gem_dmabuf_release(struct dma_buf *dma_buf)
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{
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struct drm_gem_object *obj = dma_buf->priv;
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struct drm_device *dev = obj->dev;
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/* drop the reference on the export fd holds */
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drm_gem_object_put_unlocked(obj);
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drm_dev_put(dev);
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_release);
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/**
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* drm_gem_dmabuf_vmap - dma_buf vmap implementation for GEM
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* @dma_buf: buffer to be mapped
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*
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* Sets up a kernel virtual mapping. This can be used as the &dma_buf_ops.vmap
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* callback.
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*
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* Returns the kernel virtual address.
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*/
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void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf)
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{
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struct drm_gem_object *obj = dma_buf->priv;
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struct drm_device *dev = obj->dev;
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if (dev->driver->gem_prime_vmap)
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return dev->driver->gem_prime_vmap(obj);
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else
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return NULL;
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_vmap);
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/**
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* drm_gem_dmabuf_vunmap - dma_buf vunmap implementation for GEM
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* @dma_buf: buffer to be unmapped
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* @vaddr: the virtual address of the buffer
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*
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* Releases a kernel virtual mapping. This can be used as the
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* &dma_buf_ops.vunmap callback.
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*/
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void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
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{
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struct drm_gem_object *obj = dma_buf->priv;
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struct drm_device *dev = obj->dev;
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if (dev->driver->gem_prime_vunmap)
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dev->driver->gem_prime_vunmap(obj, vaddr);
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_vunmap);
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/**
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* drm_gem_dmabuf_kmap - map implementation for GEM
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* @dma_buf: buffer to be mapped
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* @page_num: page number within the buffer
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*
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* Not implemented. This can be used as the &dma_buf_ops.map callback.
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*/
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void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num)
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{
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return NULL;
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_kmap);
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|
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/**
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* drm_gem_dmabuf_kunmap - unmap implementation for GEM
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* @dma_buf: buffer to be unmapped
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* @page_num: page number within the buffer
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* @addr: virtual address of the buffer
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*
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* Not implemented. This can be used as the &dma_buf_ops.unmap callback.
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*/
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void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num,
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void *addr)
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{
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_kunmap);
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/**
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* drm_gem_dmabuf_mmap - dma_buf mmap implementation for GEM
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* @dma_buf: buffer to be mapped
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* @vma: virtual address range
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*
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* Provides memory mapping for the buffer. This can be used as the
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* &dma_buf_ops.mmap callback.
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*
|
|
* Returns 0 on success or a negative error code on failure.
|
|
*/
|
|
int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
|
|
{
|
|
struct drm_gem_object *obj = dma_buf->priv;
|
|
struct drm_device *dev = obj->dev;
|
|
|
|
if (!dev->driver->gem_prime_mmap)
|
|
return -ENOSYS;
|
|
|
|
return dev->driver->gem_prime_mmap(obj, vma);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_dmabuf_mmap);
|
|
|
|
static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = {
|
|
.attach = drm_gem_map_attach,
|
|
.detach = drm_gem_map_detach,
|
|
.map_dma_buf = drm_gem_map_dma_buf,
|
|
.unmap_dma_buf = drm_gem_unmap_dma_buf,
|
|
.release = drm_gem_dmabuf_release,
|
|
.map = drm_gem_dmabuf_kmap,
|
|
.unmap = drm_gem_dmabuf_kunmap,
|
|
.mmap = drm_gem_dmabuf_mmap,
|
|
.vmap = drm_gem_dmabuf_vmap,
|
|
.vunmap = drm_gem_dmabuf_vunmap,
|
|
};
|
|
|
|
/**
|
|
* DOC: PRIME Helpers
|
|
*
|
|
* Drivers can implement @gem_prime_export and @gem_prime_import in terms of
|
|
* simpler APIs by using the helper functions @drm_gem_prime_export and
|
|
* @drm_gem_prime_import. These functions implement dma-buf support in terms of
|
|
* six lower-level driver callbacks:
|
|
*
|
|
* Export callbacks:
|
|
*
|
|
* * @gem_prime_pin (optional): prepare a GEM object for exporting
|
|
* * @gem_prime_get_sg_table: provide a scatter/gather table of pinned pages
|
|
* * @gem_prime_vmap: vmap a buffer exported by your driver
|
|
* * @gem_prime_vunmap: vunmap a buffer exported by your driver
|
|
* * @gem_prime_mmap (optional): mmap a buffer exported by your driver
|
|
*
|
|
* Import callback:
|
|
*
|
|
* * @gem_prime_import_sg_table (import): produce a GEM object from another
|
|
* driver's scatter/gather table
|
|
*/
|
|
|
|
/**
|
|
* drm_gem_prime_export - helper library implementation of the export callback
|
|
* @dev: drm_device to export from
|
|
* @obj: GEM object to export
|
|
* @flags: flags like DRM_CLOEXEC and DRM_RDWR
|
|
*
|
|
* This is the implementation of the gem_prime_export functions for GEM drivers
|
|
* using the PRIME helpers.
|
|
*/
|
|
struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
|
|
struct drm_gem_object *obj,
|
|
int flags)
|
|
{
|
|
struct dma_buf_export_info exp_info = {
|
|
.exp_name = KBUILD_MODNAME, /* white lie for debug */
|
|
.owner = dev->driver->fops->owner,
|
|
.ops = &drm_gem_prime_dmabuf_ops,
|
|
.size = obj->size,
|
|
.flags = flags,
|
|
.priv = obj,
|
|
};
|
|
|
|
if (dev->driver->gem_prime_res_obj)
|
|
exp_info.resv = dev->driver->gem_prime_res_obj(obj);
|
|
|
|
return drm_gem_dmabuf_export(dev, &exp_info);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_prime_export);
|
|
|
|
static struct dma_buf *export_and_register_object(struct drm_device *dev,
|
|
struct drm_gem_object *obj,
|
|
uint32_t flags)
|
|
{
|
|
struct dma_buf *dmabuf;
|
|
|
|
/* prevent races with concurrent gem_close. */
|
|
if (obj->handle_count == 0) {
|
|
dmabuf = ERR_PTR(-ENOENT);
|
|
return dmabuf;
|
|
}
|
|
|
|
dmabuf = dev->driver->gem_prime_export(dev, obj, flags);
|
|
if (IS_ERR(dmabuf)) {
|
|
/* normally the created dma-buf takes ownership of the ref,
|
|
* but if that fails then drop the ref
|
|
*/
|
|
return dmabuf;
|
|
}
|
|
|
|
/*
|
|
* Note that callers do not need to clean up the export cache
|
|
* since the check for obj->handle_count guarantees that someone
|
|
* will clean it up.
|
|
*/
|
|
obj->dma_buf = dmabuf;
|
|
get_dma_buf(obj->dma_buf);
|
|
|
|
return dmabuf;
|
|
}
|
|
|
|
/**
|
|
* drm_gem_prime_handle_to_fd - PRIME export function for GEM drivers
|
|
* @dev: dev to export the buffer from
|
|
* @file_priv: drm file-private structure
|
|
* @handle: buffer handle to export
|
|
* @flags: flags like DRM_CLOEXEC
|
|
* @prime_fd: pointer to storage for the fd id of the create dma-buf
|
|
*
|
|
* This is the PRIME export function which must be used mandatorily by GEM
|
|
* drivers to ensure correct lifetime management of the underlying GEM object.
|
|
* The actual exporting from GEM object to a dma-buf is done through the
|
|
* gem_prime_export driver callback.
|
|
*/
|
|
int drm_gem_prime_handle_to_fd(struct drm_device *dev,
|
|
struct drm_file *file_priv, uint32_t handle,
|
|
uint32_t flags,
|
|
int *prime_fd)
|
|
{
|
|
struct drm_gem_object *obj;
|
|
int ret = 0;
|
|
struct dma_buf *dmabuf;
|
|
|
|
mutex_lock(&file_priv->prime.lock);
|
|
obj = drm_gem_object_lookup(file_priv, handle);
|
|
if (!obj) {
|
|
ret = -ENOENT;
|
|
goto out_unlock;
|
|
}
|
|
|
|
dmabuf = drm_prime_lookup_buf_by_handle(&file_priv->prime, handle);
|
|
if (dmabuf) {
|
|
get_dma_buf(dmabuf);
|
|
goto out_have_handle;
|
|
}
|
|
|
|
mutex_lock(&dev->object_name_lock);
|
|
/* re-export the original imported object */
|
|
if (obj->import_attach) {
|
|
dmabuf = obj->import_attach->dmabuf;
|
|
get_dma_buf(dmabuf);
|
|
goto out_have_obj;
|
|
}
|
|
|
|
if (obj->dma_buf) {
|
|
get_dma_buf(obj->dma_buf);
|
|
dmabuf = obj->dma_buf;
|
|
goto out_have_obj;
|
|
}
|
|
|
|
dmabuf = export_and_register_object(dev, obj, flags);
|
|
if (IS_ERR(dmabuf)) {
|
|
/* normally the created dma-buf takes ownership of the ref,
|
|
* but if that fails then drop the ref
|
|
*/
|
|
ret = PTR_ERR(dmabuf);
|
|
mutex_unlock(&dev->object_name_lock);
|
|
goto out;
|
|
}
|
|
|
|
out_have_obj:
|
|
/*
|
|
* If we've exported this buffer then cheat and add it to the import list
|
|
* so we get the correct handle back. We must do this under the
|
|
* protection of dev->object_name_lock to ensure that a racing gem close
|
|
* ioctl doesn't miss to remove this buffer handle from the cache.
|
|
*/
|
|
ret = drm_prime_add_buf_handle(&file_priv->prime,
|
|
dmabuf, handle);
|
|
mutex_unlock(&dev->object_name_lock);
|
|
if (ret)
|
|
goto fail_put_dmabuf;
|
|
|
|
out_have_handle:
|
|
ret = dma_buf_fd(dmabuf, flags);
|
|
/*
|
|
* We must _not_ remove the buffer from the handle cache since the newly
|
|
* created dma buf is already linked in the global obj->dma_buf pointer,
|
|
* and that is invariant as long as a userspace gem handle exists.
|
|
* Closing the handle will clean out the cache anyway, so we don't leak.
|
|
*/
|
|
if (ret < 0) {
|
|
goto fail_put_dmabuf;
|
|
} else {
|
|
*prime_fd = ret;
|
|
ret = 0;
|
|
}
|
|
|
|
goto out;
|
|
|
|
fail_put_dmabuf:
|
|
dma_buf_put(dmabuf);
|
|
out:
|
|
drm_gem_object_put_unlocked(obj);
|
|
out_unlock:
|
|
mutex_unlock(&file_priv->prime.lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);
|
|
|
|
/**
|
|
* drm_gem_prime_import_dev - core implementation of the import callback
|
|
* @dev: drm_device to import into
|
|
* @dma_buf: dma-buf object to import
|
|
* @attach_dev: struct device to dma_buf attach
|
|
*
|
|
* This is the core of drm_gem_prime_import. It's designed to be called by
|
|
* drivers who want to use a different device structure than dev->dev for
|
|
* attaching via dma_buf.
|
|
*/
|
|
struct drm_gem_object *drm_gem_prime_import_dev(struct drm_device *dev,
|
|
struct dma_buf *dma_buf,
|
|
struct device *attach_dev)
|
|
{
|
|
struct dma_buf_attachment *attach;
|
|
struct sg_table *sgt;
|
|
struct drm_gem_object *obj;
|
|
int ret;
|
|
|
|
if (dma_buf->ops == &drm_gem_prime_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;
|
|
}
|
|
}
|
|
|
|
if (!dev->driver->gem_prime_import_sg_table)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
attach = dma_buf_attach(dma_buf, attach_dev);
|
|
if (IS_ERR(attach))
|
|
return ERR_CAST(attach);
|
|
|
|
get_dma_buf(dma_buf);
|
|
|
|
sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
|
|
if (IS_ERR(sgt)) {
|
|
ret = PTR_ERR(sgt);
|
|
goto fail_detach;
|
|
}
|
|
|
|
obj = dev->driver->gem_prime_import_sg_table(dev, attach, 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_BIDIRECTIONAL);
|
|
fail_detach:
|
|
dma_buf_detach(dma_buf, attach);
|
|
dma_buf_put(dma_buf);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_prime_import_dev);
|
|
|
|
/**
|
|
* drm_gem_prime_import - helper library implementation of the import callback
|
|
* @dev: drm_device to import into
|
|
* @dma_buf: dma-buf object to import
|
|
*
|
|
* This is the implementation of the gem_prime_import functions for GEM drivers
|
|
* using the PRIME helpers.
|
|
*/
|
|
struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev,
|
|
struct dma_buf *dma_buf)
|
|
{
|
|
return drm_gem_prime_import_dev(dev, dma_buf, dev->dev);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_prime_import);
|
|
|
|
/**
|
|
* drm_gem_prime_fd_to_handle - PRIME import function for GEM drivers
|
|
* @dev: dev to export the buffer from
|
|
* @file_priv: drm file-private structure
|
|
* @prime_fd: fd id of the dma-buf which should be imported
|
|
* @handle: pointer to storage for the handle of the imported buffer object
|
|
*
|
|
* This is the PRIME import function which must be used mandatorily by GEM
|
|
* drivers to ensure correct lifetime management of the underlying GEM object.
|
|
* The actual importing of GEM object from the dma-buf is done through the
|
|
* gem_import_export driver callback.
|
|
*/
|
|
int drm_gem_prime_fd_to_handle(struct drm_device *dev,
|
|
struct drm_file *file_priv, int prime_fd,
|
|
uint32_t *handle)
|
|
{
|
|
struct dma_buf *dma_buf;
|
|
struct drm_gem_object *obj;
|
|
int ret;
|
|
|
|
dma_buf = dma_buf_get(prime_fd);
|
|
if (IS_ERR(dma_buf))
|
|
return PTR_ERR(dma_buf);
|
|
|
|
mutex_lock(&file_priv->prime.lock);
|
|
|
|
ret = drm_prime_lookup_buf_handle(&file_priv->prime,
|
|
dma_buf, handle);
|
|
if (ret == 0)
|
|
goto out_put;
|
|
|
|
/* never seen this one, need to import */
|
|
mutex_lock(&dev->object_name_lock);
|
|
obj = dev->driver->gem_prime_import(dev, dma_buf);
|
|
if (IS_ERR(obj)) {
|
|
ret = PTR_ERR(obj);
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (obj->dma_buf) {
|
|
WARN_ON(obj->dma_buf != dma_buf);
|
|
} else {
|
|
obj->dma_buf = dma_buf;
|
|
get_dma_buf(dma_buf);
|
|
}
|
|
|
|
/* _handle_create_tail unconditionally unlocks dev->object_name_lock. */
|
|
ret = drm_gem_handle_create_tail(file_priv, obj, handle);
|
|
drm_gem_object_put_unlocked(obj);
|
|
if (ret)
|
|
goto out_put;
|
|
|
|
ret = drm_prime_add_buf_handle(&file_priv->prime,
|
|
dma_buf, *handle);
|
|
mutex_unlock(&file_priv->prime.lock);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
dma_buf_put(dma_buf);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
/* hmm, if driver attached, we are relying on the free-object path
|
|
* to detach.. which seems ok..
|
|
*/
|
|
drm_gem_handle_delete(file_priv, *handle);
|
|
dma_buf_put(dma_buf);
|
|
return ret;
|
|
|
|
out_unlock:
|
|
mutex_unlock(&dev->object_name_lock);
|
|
out_put:
|
|
mutex_unlock(&file_priv->prime.lock);
|
|
dma_buf_put(dma_buf);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_prime_fd_to_handle);
|
|
|
|
int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_prime_handle *args = data;
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_PRIME))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!dev->driver->prime_handle_to_fd)
|
|
return -ENOSYS;
|
|
|
|
/* check flags are valid */
|
|
if (args->flags & ~(DRM_CLOEXEC | DRM_RDWR))
|
|
return -EINVAL;
|
|
|
|
return dev->driver->prime_handle_to_fd(dev, file_priv,
|
|
args->handle, args->flags, &args->fd);
|
|
}
|
|
|
|
int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_prime_handle *args = data;
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_PRIME))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!dev->driver->prime_fd_to_handle)
|
|
return -ENOSYS;
|
|
|
|
return dev->driver->prime_fd_to_handle(dev, file_priv,
|
|
args->fd, &args->handle);
|
|
}
|
|
|
|
/**
|
|
* drm_prime_pages_to_sg - converts a page array into an sg list
|
|
* @pages: pointer to the array of page pointers to convert
|
|
* @nr_pages: length of the page vector
|
|
*
|
|
* This helper creates an sg table object from a set of pages
|
|
* the driver is responsible for mapping the pages into the
|
|
* importers address space for use with dma_buf itself.
|
|
*/
|
|
struct sg_table *drm_prime_pages_to_sg(struct page **pages, unsigned int nr_pages)
|
|
{
|
|
struct sg_table *sg = NULL;
|
|
int ret;
|
|
|
|
sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
|
|
if (!sg) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ret = sg_alloc_table_from_pages(sg, pages, nr_pages, 0,
|
|
nr_pages << PAGE_SHIFT, GFP_KERNEL);
|
|
if (ret)
|
|
goto out;
|
|
|
|
return sg;
|
|
out:
|
|
kfree(sg);
|
|
return ERR_PTR(ret);
|
|
}
|
|
EXPORT_SYMBOL(drm_prime_pages_to_sg);
|
|
|
|
/**
|
|
* drm_prime_sg_to_page_addr_arrays - convert an sg table into a page array
|
|
* @sgt: scatter-gather table to convert
|
|
* @pages: optional array of page pointers to store the page array in
|
|
* @addrs: optional array to store the dma bus address of each page
|
|
* @max_entries: size of both the passed-in arrays
|
|
*
|
|
* Exports an sg table into an array of pages and addresses. This is currently
|
|
* required by the TTM driver in order to do correct fault handling.
|
|
*/
|
|
int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
|
|
dma_addr_t *addrs, int max_entries)
|
|
{
|
|
unsigned count;
|
|
struct scatterlist *sg;
|
|
struct page *page;
|
|
u32 len, index;
|
|
dma_addr_t addr;
|
|
|
|
index = 0;
|
|
for_each_sg(sgt->sgl, sg, sgt->nents, count) {
|
|
len = sg->length;
|
|
page = sg_page(sg);
|
|
addr = sg_dma_address(sg);
|
|
|
|
while (len > 0) {
|
|
if (WARN_ON(index >= max_entries))
|
|
return -1;
|
|
if (pages)
|
|
pages[index] = page;
|
|
if (addrs)
|
|
addrs[index] = addr;
|
|
|
|
page++;
|
|
addr += PAGE_SIZE;
|
|
len -= PAGE_SIZE;
|
|
index++;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays);
|
|
|
|
/**
|
|
* drm_prime_gem_destroy - helper to clean up a PRIME-imported GEM object
|
|
* @obj: GEM object which was created from a dma-buf
|
|
* @sg: the sg-table which was pinned at import time
|
|
*
|
|
* This is the cleanup functions which GEM drivers need to call when they use
|
|
* @drm_gem_prime_import to import dma-bufs.
|
|
*/
|
|
void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg)
|
|
{
|
|
struct dma_buf_attachment *attach;
|
|
struct dma_buf *dma_buf;
|
|
attach = obj->import_attach;
|
|
if (sg)
|
|
dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
|
|
dma_buf = attach->dmabuf;
|
|
dma_buf_detach(attach->dmabuf, attach);
|
|
/* remove the reference */
|
|
dma_buf_put(dma_buf);
|
|
}
|
|
EXPORT_SYMBOL(drm_prime_gem_destroy);
|
|
|
|
void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv)
|
|
{
|
|
mutex_init(&prime_fpriv->lock);
|
|
prime_fpriv->dmabufs = RB_ROOT;
|
|
prime_fpriv->handles = RB_ROOT;
|
|
}
|
|
|
|
void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv)
|
|
{
|
|
/* by now drm_gem_release should've made sure the list is empty */
|
|
WARN_ON(!RB_EMPTY_ROOT(&prime_fpriv->dmabufs));
|
|
}
|