resource: Move devmem revoke code to resource framework

We want all iomem mmaps to consistently revoke ptes when the kernel
takes over and CONFIG_IO_STRICT_DEVMEM is enabled. This includes the
pci bar mmaps available through procfs and sysfs, which currently do
not revoke mappings.

To prepare for this, move the code from the /dev/kmem driver to
kernel/resource.c.

During review Jason spotted that barriers are used somewhat
inconsistently. Fix that up while we shuffle this code, since it
doesn't have an actual impact at runtime. Otherwise no semantic and
behavioural changes intended, just code extraction and adjusting
comments and names.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Kees Cook <keescook@chromium.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: linux-mm@kvack.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-media@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: David Hildenbrand <david@redhat.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20201127164131.2244124-11-daniel.vetter@ffwll.ch

1 files changed, 1 insertions, 84 deletions

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 7dcf9e4ea79d..43c871dc7477 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -31,9 +31,6 @@
 #include <linux/uio.h>
 #include <linux/uaccess.h>
 #include <linux/security.h>
-#include <linux/pseudo_fs.h>
-#include <uapi/linux/magic.h>
-#include <linux/mount.h>
 
 #ifdef CONFIG_IA64
 # include <linux/efi.h>
@@ -836,42 +833,6 @@ static loff_t memory_lseek(struct file *file, loff_t offset, int orig)
 	return ret;
 }
 
-static struct inode *devmem_inode;
-
-#ifdef CONFIG_IO_STRICT_DEVMEM
-void revoke_devmem(struct resource *res)
-{
-	/* pairs with smp_store_release() in devmem_init_inode() */
-	struct inode *inode = smp_load_acquire(&devmem_inode);
-
-	/*
-	 * Check that the initialization has completed. Losing the race
-	 * is ok because it means drivers are claiming resources before
-	 * the fs_initcall level of init and prevent /dev/mem from
-	 * establishing mappings.
-	 */
-	if (!inode)
-		return;
-
-	/*
-	 * The expectation is that the driver has successfully marked
-	 * the resource busy by this point, so devmem_is_allowed()
-	 * should start returning false, however for performance this
-	 * does not iterate the entire resource range.
-	 */
-	if (devmem_is_allowed(PHYS_PFN(res->start)) &&
-	    devmem_is_allowed(PHYS_PFN(res->end))) {
-		/*
-		 * *cringe* iomem=relaxed says "go ahead, what's the
-		 * worst that can happen?"
-		 */
-		return;
-	}
-
-	unmap_mapping_range(inode->i_mapping, res->start, resource_size(res), 1);
-}
-#endif
-
 static int open_port(struct inode *inode, struct file *filp)
 {
 	int rc;
@@ -891,7 +852,7 @@ static int open_port(struct inode *inode, struct file *filp)
 	 * revocations when drivers want to take over a /dev/mem mapped
 	 * range.
 	 */
-	filp->f_mapping = inode->i_mapping;
+	filp->f_mapping = iomem_get_mapping();
 
 	return 0;
 }
@@ -1023,48 +984,6 @@ static char *mem_devnode(struct device *dev, umode_t *mode)
 
 static struct class *mem_class;
 
-static int devmem_fs_init_fs_context(struct fs_context *fc)
-{
-	return init_pseudo(fc, DEVMEM_MAGIC) ? 0 : -ENOMEM;
-}
-
-static struct file_system_type devmem_fs_type = {
-	.name		= "devmem",
-	.owner		= THIS_MODULE,
-	.init_fs_context = devmem_fs_init_fs_context,
-	.kill_sb	= kill_anon_super,
-};
-
-static int devmem_init_inode(void)
-{
-	static struct vfsmount *devmem_vfs_mount;
-	static int devmem_fs_cnt;
-	struct inode *inode;
-	int rc;
-
-	rc = simple_pin_fs(&devmem_fs_type, &devmem_vfs_mount, &devmem_fs_cnt);
-	if (rc < 0) {
-		pr_err("Cannot mount /dev/mem pseudo filesystem: %d\n", rc);
-		return rc;
-	}
-
-	inode = alloc_anon_inode(devmem_vfs_mount->mnt_sb);
-	if (IS_ERR(inode)) {
-		rc = PTR_ERR(inode);
-		pr_err("Cannot allocate inode for /dev/mem: %d\n", rc);
-		simple_release_fs(&devmem_vfs_mount, &devmem_fs_cnt);
-		return rc;
-	}
-
-	/*
-	 * Publish /dev/mem initialized.
-	 * Pairs with smp_load_acquire() in revoke_devmem().
-	 */
-	smp_store_release(&devmem_inode, inode);
-
-	return 0;
-}
-
 static int __init chr_dev_init(void)
 {
 	int minor;
@@ -1086,8 +1005,6 @@ static int __init chr_dev_init(void)
 		 */
 		if ((minor == DEVPORT_MINOR) && !arch_has_dev_port())
 			continue;
-		if ((minor == DEVMEM_MINOR) && devmem_init_inode() != 0)
-			continue;
 
 		device_create(mem_class, NULL, MKDEV(MEM_MAJOR, minor),
 			      NULL, devlist[minor].name);