Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 356 insertions, 0 deletions

diff --git a/fs/bfs/dir.c b/fs/bfs/dir.c
new file mode 100644
index 000000000..91a4871fa
--- /dev/null
+++ b/fs/bfs/dir.c
@@ -0,0 +1,356 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *	fs/bfs/dir.c
+ *	BFS directory operations.
+ *	Copyright (C) 1999-2018  Tigran Aivazian <aivazian.tigran@gmail.com>
+ *  Made endianness-clean by Andrew Stribblehill <ads@wompom.org> 2005
+ */
+
+#include <linux/time.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/sched.h>
+#include "bfs.h"
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define dprintf(x...)	printf(x)
+#else
+#define dprintf(x...)
+#endif
+
+static int bfs_add_entry(struct inode *dir, const struct qstr *child, int ino);
+static struct buffer_head *bfs_find_entry(struct inode *dir,
+				const struct qstr *child,
+				struct bfs_dirent **res_dir);
+
+static int bfs_readdir(struct file *f, struct dir_context *ctx)
+{
+	struct inode *dir = file_inode(f);
+	struct buffer_head *bh;
+	struct bfs_dirent *de;
+	unsigned int offset;
+	int block;
+
+	if (ctx->pos & (BFS_DIRENT_SIZE - 1)) {
+		printf("Bad f_pos=%08lx for %s:%08llx\n",
+					(unsigned long)ctx->pos,
+					dir->i_sb->s_id, dir->i_ino);
+		return -EINVAL;
+	}
+
+	while (ctx->pos < dir->i_size) {
+		offset = ctx->pos & (BFS_BSIZE - 1);
+		block = BFS_I(dir)->i_sblock + (ctx->pos >> BFS_BSIZE_BITS);
+		bh = sb_bread(dir->i_sb, block);
+		if (!bh) {
+			ctx->pos += BFS_BSIZE - offset;
+			continue;
+		}
+		do {
+			de = (struct bfs_dirent *)(bh->b_data + offset);
+			if (de->ino) {
+				int size = strnlen(de->name, BFS_NAMELEN);
+				if (!dir_emit(ctx, de->name, size,
+						le16_to_cpu(de->ino),
+						DT_UNKNOWN)) {
+					brelse(bh);
+					return 0;
+				}
+			}
+			offset += BFS_DIRENT_SIZE;
+			ctx->pos += BFS_DIRENT_SIZE;
+		} while ((offset < BFS_BSIZE) && (ctx->pos < dir->i_size));
+		brelse(bh);
+	}
+	return 0;
+}
+
+const struct file_operations bfs_dir_operations = {
+	.read		= generic_read_dir,
+	.iterate_shared	= bfs_readdir,
+	.fsync		= simple_fsync,
+	.llseek		= generic_file_llseek,
+};
+
+static int bfs_create(struct mnt_idmap *idmap, struct inode *dir,
+		      struct dentry *dentry, umode_t mode)
+{
+	int err;
+	struct inode *inode;
+	struct super_block *s = dir->i_sb;
+	struct bfs_sb_info *info = BFS_SB(s);
+	unsigned long ino;
+
+	inode = new_inode(s);
+	if (!inode)
+		return -ENOMEM;
+	mutex_lock(&info->bfs_lock);
+	ino = find_first_zero_bit(info->si_imap, info->si_lasti + 1);
+	if (ino > info->si_lasti) {
+		mutex_unlock(&info->bfs_lock);
+		iput(inode);
+		return -ENOSPC;
+	}
+	set_bit(ino, info->si_imap);
+	info->si_freei--;
+	inode_init_owner(&nop_mnt_idmap, inode, dir, mode);
+	simple_inode_init_ts(inode);
+	inode->i_blocks = 0;
+	inode->i_op = &bfs_file_inops;
+	inode->i_fop = &bfs_file_operations;
+	inode->i_mapping->a_ops = &bfs_aops;
+	inode->i_ino = ino;
+	BFS_I(inode)->i_dsk_ino = ino;
+	BFS_I(inode)->i_sblock = 0;
+	BFS_I(inode)->i_eblock = 0;
+	insert_inode_hash(inode);
+        mark_inode_dirty(inode);
+	bfs_dump_imap("create", s);
+
+	err = bfs_add_entry(dir, &dentry->d_name, inode->i_ino);
+	if (err) {
+		inode_dec_link_count(inode);
+		mutex_unlock(&info->bfs_lock);
+		iput(inode);
+		return err;
+	}
+	mutex_unlock(&info->bfs_lock);
+	d_instantiate(dentry, inode);
+	return 0;
+}
+
+static struct dentry *bfs_lookup(struct inode *dir, struct dentry *dentry,
+						unsigned int flags)
+{
+	struct inode *inode = NULL;
+	struct buffer_head *bh;
+	struct bfs_dirent *de;
+	struct bfs_sb_info *info = BFS_SB(dir->i_sb);
+
+	if (dentry->d_name.len > BFS_NAMELEN)
+		return ERR_PTR(-ENAMETOOLONG);
+
+	mutex_lock(&info->bfs_lock);
+	bh = bfs_find_entry(dir, &dentry->d_name, &de);
+	if (bh) {
+		unsigned long ino = (unsigned long)le16_to_cpu(de->ino);
+		brelse(bh);
+		inode = bfs_iget(dir->i_sb, ino);
+	}
+	mutex_unlock(&info->bfs_lock);
+	return d_splice_alias(inode, dentry);
+}
+
+static int bfs_link(struct dentry *old, struct inode *dir,
+						struct dentry *new)
+{
+	struct inode *inode = d_inode(old);
+	struct bfs_sb_info *info = BFS_SB(inode->i_sb);
+	int err;
+
+	mutex_lock(&info->bfs_lock);
+	err = bfs_add_entry(dir, &new->d_name, inode->i_ino);
+	if (err) {
+		mutex_unlock(&info->bfs_lock);
+		return err;
+	}
+	inc_nlink(inode);
+	inode_set_ctime_current(inode);
+	mark_inode_dirty(inode);
+	ihold(inode);
+	d_instantiate(new, inode);
+	mutex_unlock(&info->bfs_lock);
+	return 0;
+}
+
+static int bfs_unlink(struct inode *dir, struct dentry *dentry)
+{
+	int error = -ENOENT;
+	struct inode *inode = d_inode(dentry);
+	struct buffer_head *bh;
+	struct bfs_dirent *de;
+	struct bfs_sb_info *info = BFS_SB(inode->i_sb);
+
+	mutex_lock(&info->bfs_lock);
+	bh = bfs_find_entry(dir, &dentry->d_name, &de);
+	if (!bh || (le16_to_cpu(de->ino) != inode->i_ino))
+		goto out_brelse;
+
+	if (!inode->i_nlink) {
+		printf("unlinking non-existent file %s:%llu (nlink=%d)\n",
+					inode->i_sb->s_id, inode->i_ino,
+					inode->i_nlink);
+		set_nlink(inode, 1);
+	}
+	de->ino = 0;
+	mmb_mark_buffer_dirty(bh, &BFS_I(dir)->i_metadata_bhs);
+	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
+	mark_inode_dirty(dir);
+	inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
+	inode_dec_link_count(inode);
+	error = 0;
+
+out_brelse:
+	brelse(bh);
+	mutex_unlock(&info->bfs_lock);
+	return error;
+}
+
+static int bfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
+		      struct dentry *old_dentry, struct inode *new_dir,
+		      struct dentry *new_dentry, unsigned int flags)
+{
+	struct inode *old_inode, *new_inode;
+	struct buffer_head *old_bh, *new_bh;
+	struct bfs_dirent *old_de, *new_de;
+	struct bfs_sb_info *info;
+	int error = -ENOENT;
+
+	if (flags & ~RENAME_NOREPLACE)
+		return -EINVAL;
+
+	old_bh = new_bh = NULL;
+	old_inode = d_inode(old_dentry);
+	if (S_ISDIR(old_inode->i_mode))
+		return -EINVAL;
+
+	info = BFS_SB(old_inode->i_sb);
+
+	mutex_lock(&info->bfs_lock);
+	old_bh = bfs_find_entry(old_dir, &old_dentry->d_name, &old_de);
+
+	if (!old_bh || (le16_to_cpu(old_de->ino) != old_inode->i_ino))
+		goto end_rename;
+
+	error = -EPERM;
+	new_inode = d_inode(new_dentry);
+	new_bh = bfs_find_entry(new_dir, &new_dentry->d_name, &new_de);
+
+	if (new_bh && !new_inode) {
+		brelse(new_bh);
+		new_bh = NULL;
+	}
+	if (!new_bh) {
+		error = bfs_add_entry(new_dir, &new_dentry->d_name,
+					old_inode->i_ino);
+		if (error)
+			goto end_rename;
+	}
+	old_de->ino = 0;
+	inode_set_mtime_to_ts(old_dir, inode_set_ctime_current(old_dir));
+	mark_inode_dirty(old_dir);
+	if (new_inode) {
+		inode_set_ctime_current(new_inode);
+		inode_dec_link_count(new_inode);
+	}
+	mmb_mark_buffer_dirty(old_bh, &BFS_I(old_dir)->i_metadata_bhs);
+	error = 0;
+
+end_rename:
+	mutex_unlock(&info->bfs_lock);
+	brelse(old_bh);
+	brelse(new_bh);
+	return error;
+}
+
+const struct inode_operations bfs_dir_inops = {
+	.create			= bfs_create,
+	.lookup			= bfs_lookup,
+	.link			= bfs_link,
+	.unlink			= bfs_unlink,
+	.rename			= bfs_rename,
+};
+
+static int bfs_add_entry(struct inode *dir, const struct qstr *child, int ino)
+{
+	const unsigned char *name = child->name;
+	int namelen = child->len;
+	struct buffer_head *bh;
+	struct bfs_dirent *de;
+	int block, sblock, eblock, off, pos;
+	int i;
+
+	dprintf("name=%s, namelen=%d\n", name, namelen);
+
+	sblock = BFS_I(dir)->i_sblock;
+	eblock = BFS_I(dir)->i_eblock;
+	for (block = sblock; block <= eblock; block++) {
+		bh = sb_bread(dir->i_sb, block);
+		if (!bh)
+			return -EIO;
+		for (off = 0; off < BFS_BSIZE; off += BFS_DIRENT_SIZE) {
+			de = (struct bfs_dirent *)(bh->b_data + off);
+			if (!de->ino) {
+				pos = (block - sblock) * BFS_BSIZE + off;
+				if (pos >= dir->i_size) {
+					dir->i_size += BFS_DIRENT_SIZE;
+					inode_set_ctime_current(dir);
+				}
+				inode_set_mtime_to_ts(dir,
+						      inode_set_ctime_current(dir));
+				mark_inode_dirty(dir);
+				de->ino = cpu_to_le16((u16)ino);
+				for (i = 0; i < BFS_NAMELEN; i++)
+					de->name[i] =
+						(i < namelen) ? name[i] : 0;
+				mmb_mark_buffer_dirty(bh,
+						&BFS_I(dir)->i_metadata_bhs);
+				brelse(bh);
+				return 0;
+			}
+		}
+		brelse(bh);
+	}
+	return -ENOSPC;
+}
+
+static inline int bfs_namecmp(int len, const unsigned char *name,
+							const char *buffer)
+{
+	if ((len < BFS_NAMELEN) && buffer[len])
+		return 0;
+	return !memcmp(name, buffer, len);
+}
+
+static struct buffer_head *bfs_find_entry(struct inode *dir,
+			const struct qstr *child,
+			struct bfs_dirent **res_dir)
+{
+	unsigned long block = 0, offset = 0;
+	struct buffer_head *bh = NULL;
+	struct bfs_dirent *de;
+	const unsigned char *name = child->name;
+	int namelen = child->len;
+
+	*res_dir = NULL;
+	if (namelen > BFS_NAMELEN)
+		return NULL;
+
+	while (block * BFS_BSIZE + offset < dir->i_size) {
+		if (!bh) {
+			bh = sb_bread(dir->i_sb, BFS_I(dir)->i_sblock + block);
+			if (!bh) {
+				block++;
+				continue;
+			}
+		}
+		de = (struct bfs_dirent *)(bh->b_data + offset);
+		offset += BFS_DIRENT_SIZE;
+		if (le16_to_cpu(de->ino) &&
+				bfs_namecmp(namelen, name, de->name)) {
+			*res_dir = de;
+			return bh;
+		}
+		if (offset < bh->b_size)
+			continue;
+		brelse(bh);
+		bh = NULL;
+		offset = 0;
+		block++;
+	}
+	brelse(bh);
+	return NULL;
+}