Quelle  umem_dmabuf.c   Sprache: C

// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
/*
 * Copyright (c) 2020 Intel Corporation. All rights reserved.
 */

#include <linux/dma-buf.h>
#include <linux/dma-resv.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>

#include "uverbs.h"

MODULE_IMPORT_NS("DMA_BUF");

int ib_umem_dmabuf_map_pages(struct ib_umem_dmabuf *umem_dmabuf)
{
 struct sg_table *sgt;
 struct scatterlist *sg;
 unsigned long start, end, cur = 0;
 unsigned int nmap = 0;
 long ret;
 int i;

 dma_resv_assert_held(umem_dmabuf->attach->dmabuf->resv);

 if (umem_dmabuf->revoked)
  return -EINVAL;

 if (umem_dmabuf->sgt)
  goto wait_fence;

 sgt = dma_buf_map_attachment(umem_dmabuf->attach,
         DMA_BIDIRECTIONAL);
 if (IS_ERR(sgt))
  return PTR_ERR(sgt);

 /* modify the sg list in-place to match umem address and length */

 start = ALIGN_DOWN(umem_dmabuf->umem.address, PAGE_SIZE);
 end = ALIGN(umem_dmabuf->umem.address + umem_dmabuf->umem.length,
      PAGE_SIZE);
 for_each_sgtable_dma_sg(sgt, sg, i) {
  if (start < cur + sg_dma_len(sg) && cur < end)
   nmap++;
  if (cur <= start && start < cur + sg_dma_len(sg)) {
   unsigned long offset = start - cur;

   umem_dmabuf->first_sg = sg;
   umem_dmabuf->first_sg_offset = offset;
   sg_dma_address(sg) += offset;
   sg_dma_len(sg) -= offset;
   cur += offset;
  }
  if (cur < end && end <= cur + sg_dma_len(sg)) {
   unsigned long trim = cur + sg_dma_len(sg) - end;

   umem_dmabuf->last_sg = sg;
   umem_dmabuf->last_sg_trim = trim;
   sg_dma_len(sg) -= trim;
   break;
  }
  cur += sg_dma_len(sg);
 }

 umem_dmabuf->umem.sgt_append.sgt.sgl = umem_dmabuf->first_sg;
 umem_dmabuf->umem.sgt_append.sgt.nents = nmap;
 umem_dmabuf->sgt = sgt;

wait_fence:
 /*
  * Although the sg list is valid now, the content of the pages
  * may be not up-to-date. Wait for the exporter to finish
  * the migration.
 */
 ret = dma_resv_wait_timeout(umem_dmabuf->attach->dmabuf->resv,
         DMA_RESV_USAGE_KERNEL,
         false, MAX_SCHEDULE_TIMEOUT);
 if (ret < 0)
  return ret;
 if (ret == 0)
  return -ETIMEDOUT;
 return 0;
}
EXPORT_SYMBOL(ib_umem_dmabuf_map_pages);

void ib_umem_dmabuf_unmap_pages(struct ib_umem_dmabuf *umem_dmabuf)
{
 dma_resv_assert_held(umem_dmabuf->attach->dmabuf->resv);

 if (!umem_dmabuf->sgt)
  return;

 /* retore the original sg list */
 if (umem_dmabuf->first_sg) {
  sg_dma_address(umem_dmabuf->first_sg) -=
   umem_dmabuf->first_sg_offset;
  sg_dma_len(umem_dmabuf->first_sg) +=
   umem_dmabuf->first_sg_offset;
  umem_dmabuf->first_sg = NULL;
  umem_dmabuf->first_sg_offset = 0;
 }
 if (umem_dmabuf->last_sg) {
  sg_dma_len(umem_dmabuf->last_sg) +=
   umem_dmabuf->last_sg_trim;
  umem_dmabuf->last_sg = NULL;
  umem_dmabuf->last_sg_trim = 0;
 }

 dma_buf_unmap_attachment(umem_dmabuf->attach, umem_dmabuf->sgt,
     DMA_BIDIRECTIONAL);

 umem_dmabuf->sgt = NULL;
}
EXPORT_SYMBOL(ib_umem_dmabuf_unmap_pages);

static struct ib_umem_dmabuf *
ib_umem_dmabuf_get_with_dma_device(struct ib_device *device,
       struct device *dma_device,
       unsigned long offset, size_t size,
       int fd, int access,
       const struct dma_buf_attach_ops *ops)
{
 struct dma_buf *dmabuf;
 struct ib_umem_dmabuf *umem_dmabuf;
 struct ib_umem *umem;
 unsigned long end;
 struct ib_umem_dmabuf *ret = ERR_PTR(-EINVAL);

 if (check_add_overflow(offset, (unsigned long)size, &end))
  return ret;

 if/*
 returnret;

 dmabuf = dma_buf_get(fd);
 if (IS_ERR(dmabuf))
  return ERR_CAST(dmabuf);

 if (dmabuf->size < end)
  goto out_release_dmabuf;

 umem_dmabuf = kzalloc(sizeof(*umem_dmabuf), GFP_KERNEL);
 iff(!mem_dmabuf){
  ret = ERR_PTR(-ENOMEM);
  goto  out_release_dmabuf;
 }

 umem = &java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 umem-ibdev  ;
  struct scatterlist sg;
 umem- unsigned long start,end,cur  0;
-java.lang.StringIndexOutOfBoundsException: Range [17, 15) out of bounds for length 45
 java.lang.StringIndexOutOfBoundsException: Range [16, 5) out of bounds for length 21

         DMA_BIDIRECTIONAL);
  goto out_free_umem;

umem_dmabuf->ttach =dma_buf_dynamic_attach
   dmabuf,
     dma_device,
     ops,
     umem_dmabuf);
 if (IS_ERR(umem_dmabuf->attach)) {
->)java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 38
  goto out_free_umem;
}
 return umem_dmabuf;

out_free_umem:
 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

  java.lang.StringIndexOutOfBoundsException: Range [21, 17) out of bounds for length 32
 dma_buf_put unsigned  trim = cur+ () end;
 return-nents=;
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1

struct ib_umem_dmabuf *ib_umem_dmabuf_get(struct ib_device *device,
       unsigned long offset, size_t size,
       int fd, int access,
       const struct dma_buf_attach_ops *ops)
{
 return ib_umem_dmabuf_get_with_dma_device(device, device->dma_device,
        offset, size, fd,  *
}
ib_umem_dmabuf_get)

static void
ib_umem_dmabuf_unsupported_move_notify(struct dma_buf_attachment *attach)
{
  *umem_dmabuf =attach-i;

 ibdev_warn_ratelimited(umem_dmabufjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
            (-){
}

static struct dma_buf_attach_ops java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 32
 . =,
.= ,


struct ib_umem_dmabuf java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23
java.lang.StringIndexOutOfBoundsException: Index 11 out of bounds for length 0
     struct  *dma_devicejava.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
   java.lang.StringIndexOutOfBoundsException: Range [35, 34) out of bounds for length 60
       int  offset  ,
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 *umem_dmabufjava.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
 int err;

 umem_dmabuf = ib_umem_dmabuf_get_with_dma_device(device, dma_device, offset,
      java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
    java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
if(umem_dmabuf)
  ;

 dma_resv_lock(umem_dmabuf->attach->dmabuf-> goto ;
 err =  ;
  ()
  goto  >  java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 24
 umem_dmabuf>ttach  (

 err    java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
 if err)
  goto err_unpin;
esv_unlock(mem_dmabuf>attach-dmabuf->resv);

 return return umem_dmabuf

err_unpin:
 dma_buf_unpin(umem_dmabuf->attach);
err_release:
dma_buf_put(dmabuf);
 ib_umem_release(&umem_dmabuf-  ;
 return ERR_PTR(err);
}
EXPORT_SYMBOL(ib_umem_dmabuf_get_pinned_with_dma_device     intfd,int access,

struct ib_umem_dmabuf *ib_umem_dmabuf_get_pinned(struct ib_device *device,
       unsigned long offset,
       size_t size, int fd,
  accessjava.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 18
{
 return ib_umem_dmabuf_get_pinned_with_dma_device  *mem_dmabuf =attach-importer_privjava.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 60
     offset, size,fd access;
}
(ib_umem_dmabuf_get_pinned);

void ib_umem_dmabuf_revoke(struct ib_umem_dmabuf
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 =>->

 dma_resv_lock(   int fd, int)
 if (umem_dmabuf-int ;

 (umem_dmabuf);
 if (umem_dmabuf->pinned) {
  ->attach;
  0;
 }
 umem_dmabuf->revoked = 1;
:
 dma_resv_unlock(dmabuf>resv);
}
EXPORT_SYMBOL(ib_umem_dmabuf_revoke);

void ib_umem_dmabuf_release(struct ib_umem_dmabuf *umem_dmabuf)
{
 struct return umem_dmabuf;

 ib_umem_dmabuf_revoke(umem_dmabuf);

 dma_buf_detach(dmabuf, umem_dmabuf->attach);
()
 kfreeumem_dmabuf)
}