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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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077675c1e8
Currently we use a linear walk to lookup a handle and return a dma-buf, and vice versa. A long overdue TODO task is to convert that to a hashtable. Since the initial implementation of dma-buf/prime, we now have resizeable hashtables we can use (and now a future task is to RCU enable the lookup!). However, this patch opts to use an rbtree instead to provide O(lgN) lookups (and insertion, deletion). rbtrees were chosen over using the RCU backed resizable hashtable to firstly avoid the reallocations (rbtrees can be embedded entirely within the parent struct) and to favour simpler code with predictable worst case behaviour. In simple testing, the difference between using the constant lookup and insertion of the rhashtable and the rbtree was less than 10% of the wall time (igt/benchmarks/prime_lookup) - both are dramatic improvements over the existing linear lists. v2: Favour rbtree over rhashtable Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94631 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Sean Paul <seanpaul@chromium.org> Cc: David Herrmann <dh.herrmann@gmail.com> Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Reviewed-by: Sean Paul <seanpaul@chromium.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20160926204414.23222-1-chris@chris-wilson.co.uk
834 lines
22 KiB
C
834 lines
22 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/drmP.h>
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#include <drm/drm_gem.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 is released when the dma_buf
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* object goes away in the driver .release function.
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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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* 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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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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static int drm_gem_map_attach(struct dma_buf *dma_buf,
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struct device *target_dev,
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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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static 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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struct sg_table *sgt;
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if (dev->driver->gem_prime_unpin)
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dev->driver->gem_prime_unpin(obj);
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if (!prime_attach)
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return;
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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(attach->dev, sgt->sgl, sgt->nents,
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prime_attach->dir);
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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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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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static 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(attach->dev, sgt->sgl, sgt->nents, dir)) {
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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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static 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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/**
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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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*/
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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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/* drop the reference on the export fd holds */
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drm_gem_object_unreference_unlocked(obj);
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_release);
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static 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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return dev->driver->gem_prime_vmap(obj);
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}
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static 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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dev->driver->gem_prime_vunmap(obj, vaddr);
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}
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static void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
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unsigned long page_num)
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{
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return NULL;
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}
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static void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
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unsigned long page_num, void *addr)
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{
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}
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static void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf,
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unsigned long page_num)
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{
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return NULL;
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}
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static void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf,
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unsigned long page_num, void *addr)
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{
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}
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static int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf,
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struct vm_area_struct *vma)
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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_mmap)
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return -ENOSYS;
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return dev->driver->gem_prime_mmap(obj, vma);
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}
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static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = {
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.attach = drm_gem_map_attach,
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.detach = drm_gem_map_detach,
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.map_dma_buf = drm_gem_map_dma_buf,
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.unmap_dma_buf = drm_gem_unmap_dma_buf,
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.release = drm_gem_dmabuf_release,
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.kmap = drm_gem_dmabuf_kmap,
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.kmap_atomic = drm_gem_dmabuf_kmap_atomic,
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.kunmap = drm_gem_dmabuf_kunmap,
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.kunmap_atomic = drm_gem_dmabuf_kunmap_atomic,
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.mmap = drm_gem_dmabuf_mmap,
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.vmap = drm_gem_dmabuf_vmap,
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.vunmap = drm_gem_dmabuf_vunmap,
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};
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/**
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* DOC: PRIME Helpers
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*
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* Drivers can implement @gem_prime_export and @gem_prime_import in terms of
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* simpler APIs by using the helper functions @drm_gem_prime_export and
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* @drm_gem_prime_import. These functions implement dma-buf support in terms of
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* six lower-level driver callbacks:
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*
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* Export callbacks:
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*
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* * @gem_prime_pin (optional): prepare a GEM object for exporting
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* * @gem_prime_get_sg_table: provide a scatter/gather table of pinned pages
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* * @gem_prime_vmap: vmap a buffer exported by your driver
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* * @gem_prime_vunmap: vunmap a buffer exported by your driver
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* * @gem_prime_mmap (optional): mmap a buffer exported by your driver
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*
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* Import callback:
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*
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* * @gem_prime_import_sg_table (import): produce a GEM object from another
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* driver's scatter/gather table
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*/
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/**
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* drm_gem_prime_export - helper library implementation of the export callback
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* @dev: drm_device to export from
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* @obj: GEM object to export
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* @flags: flags like DRM_CLOEXEC and DRM_RDWR
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*
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* This is the implementation of the gem_prime_export functions for GEM drivers
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* using the PRIME helpers.
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*/
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struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
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struct drm_gem_object *obj, int flags)
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{
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DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
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exp_info.ops = &drm_gem_prime_dmabuf_ops;
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exp_info.size = obj->size;
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exp_info.flags = flags;
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exp_info.priv = obj;
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if (dev->driver->gem_prime_res_obj)
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exp_info.resv = dev->driver->gem_prime_res_obj(obj);
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return dma_buf_export(&exp_info);
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}
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EXPORT_SYMBOL(drm_gem_prime_export);
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static struct dma_buf *export_and_register_object(struct drm_device *dev,
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struct drm_gem_object *obj,
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uint32_t flags)
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{
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struct dma_buf *dmabuf;
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/* prevent races with concurrent gem_close. */
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if (obj->handle_count == 0) {
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dmabuf = ERR_PTR(-ENOENT);
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return dmabuf;
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}
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dmabuf = dev->driver->gem_prime_export(dev, obj, flags);
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if (IS_ERR(dmabuf)) {
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/* normally the created dma-buf takes ownership of the ref,
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* but if that fails then drop the ref
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*/
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return dmabuf;
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}
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/*
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* Note that callers do not need to clean up the export cache
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* since the check for obj->handle_count guarantees that someone
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* will clean it up.
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*/
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obj->dma_buf = dmabuf;
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get_dma_buf(obj->dma_buf);
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/* Grab a new ref since the callers is now used by the dma-buf */
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drm_gem_object_reference(obj);
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return dmabuf;
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}
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/**
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* drm_gem_prime_handle_to_fd - PRIME export function for GEM drivers
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* @dev: dev to export the buffer from
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* @file_priv: drm file-private structure
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* @handle: buffer handle to export
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* @flags: flags like DRM_CLOEXEC
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* @prime_fd: pointer to storage for the fd id of the create dma-buf
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*
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* This is the PRIME export function which must be used mandatorily by GEM
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* drivers to ensure correct lifetime management of the underlying GEM object.
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* The actual exporting from GEM object to a dma-buf is done through the
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* gem_prime_export driver callback.
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|
*/
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|
int drm_gem_prime_handle_to_fd(struct drm_device *dev,
|
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struct drm_file *file_priv, uint32_t handle,
|
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uint32_t flags,
|
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int *prime_fd)
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|
{
|
|
struct drm_gem_object *obj;
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int ret = 0;
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struct dma_buf *dmabuf;
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mutex_lock(&file_priv->prime.lock);
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obj = drm_gem_object_lookup(file_priv, handle);
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if (!obj) {
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ret = -ENOENT;
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goto out_unlock;
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}
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|
|
dmabuf = drm_prime_lookup_buf_by_handle(&file_priv->prime, handle);
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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_unreference_unlocked(obj);
|
|
out_unlock:
|
|
mutex_unlock(&file_priv->prime.lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
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_reference(obj);
|
|
return obj;
|
|
}
|
|
}
|
|
|
|
if (!dev->driver->gem_prime_import_sg_table)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
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_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);
|
|
|
|
/**
|
|
* 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_unreference_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 -EINVAL;
|
|
|
|
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 -EINVAL;
|
|
|
|
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: array of page pointers to store the page array in
|
|
* @addrs: optional array to store the dma bus address of each page
|
|
* @max_pages: 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_pages)
|
|
{
|
|
unsigned count;
|
|
struct scatterlist *sg;
|
|
struct page *page;
|
|
u32 len;
|
|
int pg_index;
|
|
dma_addr_t addr;
|
|
|
|
pg_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(pg_index >= max_pages))
|
|
return -1;
|
|
pages[pg_index] = page;
|
|
if (addrs)
|
|
addrs[pg_index] = addr;
|
|
|
|
page++;
|
|
addr += PAGE_SIZE;
|
|
len -= PAGE_SIZE;
|
|
pg_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));
|
|
}
|