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

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

5 files changed, 53 insertions, 48 deletions

diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index fe48b7840665..55de385c839c 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -334,11 +334,7 @@ static inline void irqresource_disabled(struct resource *res, u32 irq)
 	res->flags = IORESOURCE_IRQ | IORESOURCE_DISABLED | IORESOURCE_UNSET;
 }
 
-#ifdef CONFIG_IO_STRICT_DEVMEM
-void revoke_devmem(struct resource *res);
-#else
-static inline void revoke_devmem(struct resource *res) { };
-#endif
+extern struct address_space *iomem_get_mapping(void);
 
 #endif /* __ASSEMBLY__ */
 #endif	/* _LINUX_IOPORT_H */
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1696ee6ab22d..7deb7168104d 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -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);
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 2caa34c1ca1a..d76a1ddf83a3 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -164,11 +164,13 @@ __ATTRIBUTE_GROUPS(_name)
 
 struct file;
 struct vm_area_struct;
+struct address_space;
 
 struct bin_attribute {
 	struct attribute	attr;
 	size_t			size;
 	void			*private;
+	struct address_space	*mapping;
 	ssize_t (*read)(struct file *, struct kobject *, struct bin_attribute *,
 			char *, loff_t, size_t);
 	ssize_t (*write)(struct file *, struct kobject *, struct bin_attribute *,
diff --git a/include/media/frame_vector.h b/include/media/frame_vector.h
new file mode 100644
index 000000000000..bfed1710dc24
--- /dev/null
+++ b/include/media/frame_vector.h
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef _MEDIA_FRAME_VECTOR_H
+#define _MEDIA_FRAME_VECTOR_H
+
+/* Container for pinned pfns / pages in frame_vector.c */
+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,
+		     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);
+}
+
+#endif /* _MEDIA_FRAME_VECTOR_H */
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 61969402a0e3..799ba61b5b6f 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -18,6 +18,7 @@
 #include <linux/dma-buf.h>
 #include <linux/bitops.h>
 #include <media/media-request.h>
+#include <media/frame_vector.h>
 
 #define VB2_MAX_FRAME	(32)
 #define VB2_MAX_PLANES	(8)