From 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:44:59 +0000
Subject: [PATCH] gmac get mac form eeprom
---
kernel/drivers/dax/super.c | 282 ++++++++++++++++++++++++++++++++++++++------------------
1 files changed, 192 insertions(+), 90 deletions(-)
diff --git a/kernel/drivers/dax/super.c b/kernel/drivers/dax/super.c
index 6e928f3..260a247 100644
--- a/kernel/drivers/dax/super.c
+++ b/kernel/drivers/dax/super.c
@@ -1,18 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright(c) 2017 Intel Corporation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
*/
#include <linux/pagemap.h>
#include <linux/module.h>
#include <linux/mount.h>
+#include <linux/pseudo_fs.h>
#include <linux/magic.h>
#include <linux/genhd.h>
#include <linux/pfn_t.h>
@@ -22,6 +15,7 @@
#include <linux/uio.h>
#include <linux/dax.h>
#include <linux/fs.h>
+#include "dax-private.h"
static dev_t dax_devt;
DEFINE_STATIC_SRCU(dax_srcu);
@@ -52,7 +46,8 @@
int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,
pgoff_t *pgoff)
{
- phys_addr_t phys_off = (get_start_sect(bdev) + sector) * 512;
+ sector_t start_sect = bdev ? get_start_sect(bdev) : 0;
+ phys_addr_t phys_off = (start_sect + sector) * 512;
if (pgoff)
*pgoff = PHYS_PFN(phys_off);
@@ -65,70 +60,61 @@
#if IS_ENABLED(CONFIG_FS_DAX)
struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
{
- if (!blk_queue_dax(bdev->bd_queue))
+ if (!blk_queue_dax(bdev->bd_disk->queue))
return NULL;
- return fs_dax_get_by_host(bdev->bd_disk->disk_name);
+ return dax_get_by_host(bdev->bd_disk->disk_name);
}
EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev);
#endif
-/**
- * __bdev_dax_supported() - Check if the device supports dax for filesystem
- * @bdev: block device to check
- * @blocksize: The block size of the device
- *
- * This is a library function for filesystems to check if the block device
- * can be mounted with dax option.
- *
- * Return: true if supported, false if unsupported
- */
-bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
+bool __generic_fsdax_supported(struct dax_device *dax_dev,
+ struct block_device *bdev, int blocksize, sector_t start,
+ sector_t sectors)
{
- struct dax_device *dax_dev;
bool dax_enabled = false;
- struct request_queue *q;
- pgoff_t pgoff;
- int err, id;
- pfn_t pfn;
- long len;
+ pgoff_t pgoff, pgoff_end;
char buf[BDEVNAME_SIZE];
+ void *kaddr, *end_kaddr;
+ pfn_t pfn, end_pfn;
+ sector_t last_page;
+ long len, len2;
+ int err, id;
if (blocksize != PAGE_SIZE) {
- pr_debug("%s: error: unsupported blocksize for dax\n",
+ pr_info("%s: error: unsupported blocksize for dax\n",
bdevname(bdev, buf));
return false;
}
- q = bdev_get_queue(bdev);
- if (!q || !blk_queue_dax(q)) {
- pr_debug("%s: error: request queue doesn't support dax\n",
- bdevname(bdev, buf));
- return false;
- }
-
- err = bdev_dax_pgoff(bdev, 0, PAGE_SIZE, &pgoff);
- if (err) {
- pr_debug("%s: error: unaligned partition for dax\n",
- bdevname(bdev, buf));
- return false;
- }
-
- dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
if (!dax_dev) {
- pr_debug("%s: error: device does not support dax\n",
+ pr_debug("%s: error: dax unsupported by block device\n",
+ bdevname(bdev, buf));
+ return false;
+ }
+
+ err = bdev_dax_pgoff(bdev, start, PAGE_SIZE, &pgoff);
+ if (err) {
+ pr_info("%s: error: unaligned partition for dax\n",
+ bdevname(bdev, buf));
+ return false;
+ }
+
+ last_page = PFN_DOWN((start + sectors - 1) * 512) * PAGE_SIZE / 512;
+ err = bdev_dax_pgoff(bdev, last_page, PAGE_SIZE, &pgoff_end);
+ if (err) {
+ pr_info("%s: error: unaligned partition for dax\n",
bdevname(bdev, buf));
return false;
}
id = dax_read_lock();
- len = dax_direct_access(dax_dev, pgoff, 1, NULL, &pfn);
- dax_read_unlock(id);
+ len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn);
+ len2 = dax_direct_access(dax_dev, pgoff_end, 1, &end_kaddr, &end_pfn);
- put_dax(dax_dev);
-
- if (len < 1) {
- pr_debug("%s: error: dax access failed (%ld)\n",
- bdevname(bdev, buf), len);
+ if (len < 1 || len2 < 1) {
+ pr_info("%s: error: dax access failed (%ld)\n",
+ bdevname(bdev, buf), len < 1 ? len : len2);
+ dax_read_unlock(id);
return false;
}
@@ -143,21 +129,72 @@
*/
WARN_ON(IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API));
dax_enabled = true;
- } else if (pfn_t_devmap(pfn)) {
- struct dev_pagemap *pgmap;
+ } else if (pfn_t_devmap(pfn) && pfn_t_devmap(end_pfn)) {
+ struct dev_pagemap *pgmap, *end_pgmap;
pgmap = get_dev_pagemap(pfn_t_to_pfn(pfn), NULL);
- if (pgmap && pgmap->type == MEMORY_DEVICE_FS_DAX)
+ end_pgmap = get_dev_pagemap(pfn_t_to_pfn(end_pfn), NULL);
+ if (pgmap && pgmap == end_pgmap && pgmap->type == MEMORY_DEVICE_FS_DAX
+ && pfn_t_to_page(pfn)->pgmap == pgmap
+ && pfn_t_to_page(end_pfn)->pgmap == pgmap
+ && pfn_t_to_pfn(pfn) == PHYS_PFN(__pa(kaddr))
+ && pfn_t_to_pfn(end_pfn) == PHYS_PFN(__pa(end_kaddr)))
dax_enabled = true;
put_dev_pagemap(pgmap);
+ put_dev_pagemap(end_pgmap);
+
}
+ dax_read_unlock(id);
if (!dax_enabled) {
- pr_debug("%s: error: dax support not enabled\n",
+ pr_info("%s: error: dax support not enabled\n",
bdevname(bdev, buf));
return false;
}
return true;
+}
+EXPORT_SYMBOL_GPL(__generic_fsdax_supported);
+
+/**
+ * __bdev_dax_supported() - Check if the device supports dax for filesystem
+ * @bdev: block device to check
+ * @blocksize: The block size of the device
+ *
+ * This is a library function for filesystems to check if the block device
+ * can be mounted with dax option.
+ *
+ * Return: true if supported, false if unsupported
+ */
+bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
+{
+ struct dax_device *dax_dev;
+ struct request_queue *q;
+ char buf[BDEVNAME_SIZE];
+ bool ret;
+ int id;
+
+ q = bdev_get_queue(bdev);
+ if (!q || !blk_queue_dax(q)) {
+ pr_debug("%s: error: request queue doesn't support dax\n",
+ bdevname(bdev, buf));
+ return false;
+ }
+
+ dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
+ if (!dax_dev) {
+ pr_debug("%s: error: device does not support dax\n",
+ bdevname(bdev, buf));
+ return false;
+ }
+
+ id = dax_read_lock();
+ ret = dax_supported(dax_dev, bdev, blocksize, 0,
+ i_size_read(bdev->bd_inode) / 512);
+ dax_read_unlock(id);
+
+ put_dax(dax_dev);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(__bdev_dax_supported);
#endif
@@ -167,6 +204,8 @@
DAXDEV_ALIVE,
/* gate whether dax_flush() calls the low level flush routine */
DAXDEV_WRITE_CACHE,
+ /* flag to check if device supports synchronous flush */
+ DAXDEV_SYNC,
};
/**
@@ -284,6 +323,19 @@
}
EXPORT_SYMBOL_GPL(dax_direct_access);
+bool dax_supported(struct dax_device *dax_dev, struct block_device *bdev,
+ int blocksize, sector_t start, sector_t len)
+{
+ if (!dax_dev)
+ return false;
+
+ if (!dax_alive(dax_dev))
+ return false;
+
+ return dax_dev->ops->dax_supported(dax_dev, bdev, blocksize, start, len);
+}
+EXPORT_SYMBOL_GPL(dax_supported);
+
size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
size_t bytes, struct iov_iter *i)
{
@@ -303,6 +355,23 @@
return dax_dev->ops->copy_to_iter(dax_dev, pgoff, addr, bytes, i);
}
EXPORT_SYMBOL_GPL(dax_copy_to_iter);
+
+int dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff,
+ size_t nr_pages)
+{
+ if (!dax_alive(dax_dev))
+ return -ENXIO;
+ /*
+ * There are no callers that want to zero more than one page as of now.
+ * Once users are there, this check can be removed after the
+ * device mapper code has been updated to split ranges across targets.
+ */
+ if (nr_pages != 1)
+ return -EIO;
+
+ return dax_dev->ops->zero_page_range(dax_dev, pgoff, nr_pages);
+}
+EXPORT_SYMBOL_GPL(dax_zero_page_range);
#ifdef CONFIG_ARCH_HAS_PMEM_API
void arch_wb_cache_pmem(void *addr, size_t size);
@@ -335,6 +404,18 @@
}
EXPORT_SYMBOL_GPL(dax_write_cache_enabled);
+bool __dax_synchronous(struct dax_device *dax_dev)
+{
+ return test_bit(DAXDEV_SYNC, &dax_dev->flags);
+}
+EXPORT_SYMBOL_GPL(__dax_synchronous);
+
+void __set_dax_synchronous(struct dax_device *dax_dev)
+{
+ set_bit(DAXDEV_SYNC, &dax_dev->flags);
+}
+EXPORT_SYMBOL_GPL(__set_dax_synchronous);
+
bool dax_alive(struct dax_device *dax_dev)
{
lockdep_assert_held(&dax_srcu);
@@ -365,10 +446,14 @@
spin_lock(&dax_host_lock);
hlist_del_init(&dax_dev->list);
spin_unlock(&dax_host_lock);
-
- dax_dev->private = NULL;
}
EXPORT_SYMBOL_GPL(kill_dax);
+
+void run_dax(struct dax_device *dax_dev)
+{
+ set_bit(DAXDEV_ALIVE, &dax_dev->flags);
+}
+EXPORT_SYMBOL_GPL(run_dax);
static struct inode *dax_alloc_inode(struct super_block *sb)
{
@@ -389,11 +474,9 @@
return container_of(inode, struct dax_device, inode);
}
-static void dax_i_callback(struct rcu_head *head)
+static void dax_free_inode(struct inode *inode)
{
- struct inode *inode = container_of(head, struct inode, i_rcu);
struct dax_device *dax_dev = to_dax_dev(inode);
-
kfree(dax_dev->host);
dax_dev->host = NULL;
if (inode->i_rdev)
@@ -404,29 +487,31 @@
static void dax_destroy_inode(struct inode *inode)
{
struct dax_device *dax_dev = to_dax_dev(inode);
-
WARN_ONCE(test_bit(DAXDEV_ALIVE, &dax_dev->flags),
"kill_dax() must be called before final iput()\n");
- call_rcu(&inode->i_rcu, dax_i_callback);
}
static const struct super_operations dax_sops = {
.statfs = simple_statfs,
.alloc_inode = dax_alloc_inode,
.destroy_inode = dax_destroy_inode,
+ .free_inode = dax_free_inode,
.drop_inode = generic_delete_inode,
};
-static struct dentry *dax_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
+static int dax_init_fs_context(struct fs_context *fc)
{
- return mount_pseudo(fs_type, "dax:", &dax_sops, NULL, DAXFS_MAGIC);
+ struct pseudo_fs_context *ctx = init_pseudo(fc, DAXFS_MAGIC);
+ if (!ctx)
+ return -ENOMEM;
+ ctx->ops = &dax_sops;
+ return 0;
}
static struct file_system_type dax_fs_type = {
- .name = "dax",
- .mount = dax_mount,
- .kill_sb = kill_anon_super,
+ .name = "dax",
+ .init_fs_context = dax_init_fs_context,
+ .kill_sb = kill_anon_super,
};
static int dax_test(struct inode *inode, void *data)
@@ -488,16 +573,23 @@
}
struct dax_device *alloc_dax(void *private, const char *__host,
- const struct dax_operations *ops)
+ const struct dax_operations *ops, unsigned long flags)
{
struct dax_device *dax_dev;
const char *host;
dev_t devt;
int minor;
+ if (ops && !ops->zero_page_range) {
+ pr_debug("%s: error: device does not provide dax"
+ " operation zero_page_range()\n",
+ __host ? __host : "Unknown");
+ return ERR_PTR(-EINVAL);
+ }
+
host = kstrdup(__host, GFP_KERNEL);
if (__host && !host)
- return NULL;
+ return ERR_PTR(-ENOMEM);
minor = ida_simple_get(&dax_minor_ida, 0, MINORMASK+1, GFP_KERNEL);
if (minor < 0)
@@ -511,13 +603,16 @@
dax_add_host(dax_dev, host);
dax_dev->ops = ops;
dax_dev->private = private;
+ if (flags & DAXDEV_F_SYNC)
+ set_dax_synchronous(dax_dev);
+
return dax_dev;
err_dev:
ida_simple_remove(&dax_minor_ida, minor);
err_minor:
kfree(host);
- return NULL;
+ return ERR_PTR(-ENOMEM);
}
EXPORT_SYMBOL_GPL(alloc_dax);
@@ -584,6 +679,8 @@
void *dax_get_private(struct dax_device *dax_dev)
{
+ if (!test_bit(DAXDEV_ALIVE, &dax_dev->flags))
+ return NULL;
return dax_dev->private;
}
EXPORT_SYMBOL_GPL(dax_get_private);
@@ -597,7 +694,7 @@
inode_init_once(inode);
}
-static int __dax_fs_init(void)
+static int dax_fs_init(void)
{
int rc;
@@ -607,10 +704,6 @@
init_once);
if (!dax_cache)
return -ENOMEM;
-
- rc = register_filesystem(&dax_fs_type);
- if (rc)
- goto err_register_fs;
dax_mnt = kern_mount(&dax_fs_type);
if (IS_ERR(dax_mnt)) {
@@ -622,42 +715,51 @@
return 0;
err_mount:
- unregister_filesystem(&dax_fs_type);
- err_register_fs:
kmem_cache_destroy(dax_cache);
return rc;
}
-static void __dax_fs_exit(void)
+static void dax_fs_exit(void)
{
kern_unmount(dax_mnt);
- unregister_filesystem(&dax_fs_type);
+ rcu_barrier();
kmem_cache_destroy(dax_cache);
}
-static int __init dax_fs_init(void)
+static int __init dax_core_init(void)
{
int rc;
- rc = __dax_fs_init();
+ rc = dax_fs_init();
if (rc)
return rc;
rc = alloc_chrdev_region(&dax_devt, 0, MINORMASK+1, "dax");
if (rc)
- __dax_fs_exit();
- return rc;
+ goto err_chrdev;
+
+ rc = dax_bus_init();
+ if (rc)
+ goto err_bus;
+ return 0;
+
+err_bus:
+ unregister_chrdev_region(dax_devt, MINORMASK+1);
+err_chrdev:
+ dax_fs_exit();
+ return 0;
}
-static void __exit dax_fs_exit(void)
+static void __exit dax_core_exit(void)
{
+ dax_bus_exit();
unregister_chrdev_region(dax_devt, MINORMASK+1);
ida_destroy(&dax_minor_ida);
- __dax_fs_exit();
+ dax_fs_exit();
}
MODULE_AUTHOR("Intel Corporation");
MODULE_LICENSE("GPL v2");
-subsys_initcall(dax_fs_init);
-module_exit(dax_fs_exit);
+subsys_initcall(dax_core_init);
+module_exit(dax_core_exit);
--
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