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Merge tag 'topic/iomem-mmap-vs-gup-2021-02-22' of git://anongit.freedesktop.org/drm/drm

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Pull follow_pfn() updates from Daniel Vetter:
 "Fixes around VM_FPNMAP and follow_pfn:

   - replace mm/frame_vector.c by get_user_pages in misc/habana and
     drm/exynos drivers, then move that into media as it's sole user

   - close race in generic_access_phys

   - s390 pci ioctl fix of this series landed in 5.11 already

   - properly revoke iomem mappings (/dev/mem, pci files)"

* tag 'topic/iomem-mmap-vs-gup-2021-02-22' of git://anongit.freedesktop.org/drm/drm:
  PCI: Revoke mappings like devmem
  PCI: Also set up legacy files only after sysfs init
  sysfs: Support zapping of binary attr mmaps
  resource: Move devmem revoke code to resource framework
  /dev/mem: Only set filp->f_mapping
  PCI: Obey iomem restrictions for procfs mmap
  mm: Close race in generic_access_phys
  media: videobuf2: Move frame_vector into media subsystem
  mm/frame-vector: Use FOLL_LONGTERM
  misc/habana: Use FOLL_LONGTERM for userptr
  misc/habana: Stop using frame_vector helpers
  drm/exynos: Use FOLL_LONGTERM for g2d cmdlists
  drm/exynos: Stop using frame_vector helpers
This commit is contained in:
Linus Torvalds
2021-02-22 17:45:02 -08:00
parent 4b5f9254e4 636b21b501
commit e913a8cdc2
23 changed files with 287 additions and 245 deletions
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45
include/linux/mm.h
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@@ -593,7 +593,8 @@ struct vm_operations_struct {
vm_fault_t (*pfn_mkwrite)(struct vm_fault *vmf);
/* called by access_process_vm when get_user_pages() fails, typically
* for use by special VMAs that can switch between memory and hardware
* for use by special VMAs. See also generic_access_phys() for a generic
* implementation useful for any iomem mapping.
*/
int (*access)(struct vm_area_struct *vma, unsigned long addr,
void *buf, int len, int write);
@@ -1761,48 +1762,6 @@ int account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc);
int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc,
struct task_struct *task, bool bypass_rlim);
/* Container for pinned pfns / pages */
struct frame_vector {
unsigned int nr_allocated; /* Number of frames we have space for */
unsigned int nr_frames; /* Number of frames stored in ptrs array */
bool got_ref; /* Did we pin pages by getting page ref? */
bool is_pfns; /* Does array contain pages or pfns? */
void *ptrs[]; /* Array of pinned pfns / pages. Use
* pfns_vector_pages() or pfns_vector_pfns()
* for access */
};
struct frame_vector *frame_vector_create(unsigned int nr_frames);
void frame_vector_destroy(struct frame_vector *vec);
int get_vaddr_frames(unsigned long start, unsigned int nr_pfns,
unsigned int gup_flags, struct frame_vector *vec);
void put_vaddr_frames(struct frame_vector *vec);
int frame_vector_to_pages(struct frame_vector *vec);
void frame_vector_to_pfns(struct frame_vector *vec);
static inline unsigned int frame_vector_count(struct frame_vector *vec)
{
return vec->nr_frames;
}
static inline struct page **frame_vector_pages(struct frame_vector *vec)
{
if (vec->is_pfns) {
int err = frame_vector_to_pages(vec);
if (err)
return ERR_PTR(err);
}
return (struct page **)(vec->ptrs);
}
static inline unsigned long *frame_vector_pfns(struct frame_vector *vec)
{
if (!vec->is_pfns)
frame_vector_to_pfns(vec);
return (unsigned long *)(vec->ptrs);
}
struct kvec;
int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
struct page **pages);