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, 475 insertions, 0 deletions

diff --git a/fs/openpromfs/inode.c b/fs/openpromfs/inode.c
new file mode 100644
index 000000000..fb8d84bde
--- /dev/null
+++ b/fs/openpromfs/inode.c
@@ -0,0 +1,475 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* inode.c: /proc/openprom handling routines
+ *
+ * Copyright (C) 1996-1999 Jakub Jelinek  (jakub@redhat.com)
+ * Copyright (C) 1998      Eddie C. Dost  (ecd@skynet.be)
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/fs_context.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#include <linux/magic.h>
+
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+#include <asm/prom.h>
+#include <linux/uaccess.h>
+
+static DEFINE_MUTEX(op_mutex);
+
+#define OPENPROM_ROOT_INO	0
+
+enum op_inode_type {
+	op_inode_node,
+	op_inode_prop,
+};
+
+union op_inode_data {
+	struct device_node	*node;
+	struct property		*prop;
+};
+
+struct op_inode_info {
+	struct inode		vfs_inode;
+	enum op_inode_type	type;
+	union op_inode_data	u;
+};
+
+static struct inode *openprom_iget(struct super_block *sb, ino_t ino);
+
+static inline struct op_inode_info *OP_I(struct inode *inode)
+{
+	return container_of(inode, struct op_inode_info, vfs_inode);
+}
+
+static int is_string(unsigned char *p, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++) {
+		unsigned char val = p[i];
+
+		if ((i && !val) ||
+		    (val >= ' ' && val <= '~'))
+			continue;
+
+		return 0;
+	}
+
+	return 1;
+}
+
+static int property_show(struct seq_file *f, void *v)
+{
+	struct property *prop = f->private;
+	void *pval;
+	int len;
+
+	len = prop->length;
+	pval = prop->value;
+
+	if (is_string(pval, len)) {
+		while (len > 0) {
+			int n = strlen(pval);
+
+			seq_printf(f, "%s", (char *) pval);
+
+			/* Skip over the NULL byte too.  */
+			pval += n + 1;
+			len -= n + 1;
+
+			if (len > 0)
+				seq_printf(f, " + ");
+		}
+	} else {
+		if (len & 3) {
+			while (len) {
+				len--;
+				if (len)
+					seq_printf(f, "%02x.",
+						   *(unsigned char *) pval);
+				else
+					seq_printf(f, "%02x",
+						   *(unsigned char *) pval);
+				pval++;
+			}
+		} else {
+			while (len >= 4) {
+				len -= 4;
+
+				if (len)
+					seq_printf(f, "%08x.",
+						   *(unsigned int *) pval);
+				else
+					seq_printf(f, "%08x",
+						   *(unsigned int *) pval);
+				pval += 4;
+			}
+		}
+	}
+	seq_printf(f, "\n");
+
+	return 0;
+}
+
+static void *property_start(struct seq_file *f, loff_t *pos)
+{
+	if (*pos == 0)
+		return pos;
+	return NULL;
+}
+
+static void *property_next(struct seq_file *f, void *v, loff_t *pos)
+{
+	(*pos)++;
+	return NULL;
+}
+
+static void property_stop(struct seq_file *f, void *v)
+{
+	/* Nothing to do */
+}
+
+static const struct seq_operations property_op = {
+	.start		= property_start,
+	.next		= property_next,
+	.stop		= property_stop,
+	.show		= property_show
+};
+
+static int property_open(struct inode *inode, struct file *file)
+{
+	struct op_inode_info *oi = OP_I(inode);
+	int ret;
+
+	BUG_ON(oi->type != op_inode_prop);
+
+	ret = seq_open(file, &property_op);
+	if (!ret) {
+		struct seq_file *m = file->private_data;
+		m->private = oi->u.prop;
+	}
+	return ret;
+}
+
+static const struct file_operations openpromfs_prop_ops = {
+	.open		= property_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+};
+
+static int openpromfs_readdir(struct file *, struct dir_context *);
+
+static const struct file_operations openprom_operations = {
+	.read		= generic_read_dir,
+	.iterate_shared	= openpromfs_readdir,
+	.llseek		= generic_file_llseek,
+};
+
+static struct dentry *openpromfs_lookup(struct inode *, struct dentry *, unsigned int);
+
+static const struct inode_operations openprom_inode_operations = {
+	.lookup		= openpromfs_lookup,
+};
+
+static struct dentry *openpromfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
+{
+	struct op_inode_info *ent_oi, *oi = OP_I(dir);
+	struct device_node *dp, *child;
+	struct property *prop;
+	enum op_inode_type ent_type;
+	union op_inode_data ent_data;
+	const char *name;
+	struct inode *inode;
+	unsigned int ino;
+	int len;
+	
+	BUG_ON(oi->type != op_inode_node);
+
+	dp = oi->u.node;
+
+	name = dentry->d_name.name;
+	len = dentry->d_name.len;
+
+	mutex_lock(&op_mutex);
+
+	child = dp->child;
+	while (child) {
+		const char *node_name = kbasename(child->full_name);
+		int n = strlen(node_name);
+
+		if (len == n &&
+		    !strncmp(node_name, name, len)) {
+			ent_type = op_inode_node;
+			ent_data.node = child;
+			ino = child->unique_id;
+			goto found;
+		}
+		child = child->sibling;
+	}
+
+	prop = dp->properties;
+	while (prop) {
+		int n = strlen(prop->name);
+
+		if (len == n && !strncmp(prop->name, name, len)) {
+			ent_type = op_inode_prop;
+			ent_data.prop = prop;
+			ino = prop->unique_id;
+			goto found;
+		}
+
+		prop = prop->next;
+	}
+
+	mutex_unlock(&op_mutex);
+	return ERR_PTR(-ENOENT);
+
+found:
+	inode = openprom_iget(dir->i_sb, ino);
+	mutex_unlock(&op_mutex);
+	if (IS_ERR(inode))
+		return ERR_CAST(inode);
+	if (inode_state_read_once(inode) & I_NEW) {
+		simple_inode_init_ts(inode);
+		ent_oi = OP_I(inode);
+		ent_oi->type = ent_type;
+		ent_oi->u = ent_data;
+
+		switch (ent_type) {
+		case op_inode_node:
+			inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
+			inode->i_op = &openprom_inode_operations;
+			inode->i_fop = &openprom_operations;
+			set_nlink(inode, 2);
+			break;
+		case op_inode_prop:
+			if (of_node_name_eq(dp, "options") && (len == 17) &&
+			    !strncmp (name, "security-password", 17))
+				inode->i_mode = S_IFREG | S_IRUSR | S_IWUSR;
+			else
+				inode->i_mode = S_IFREG | S_IRUGO;
+			inode->i_fop = &openpromfs_prop_ops;
+			set_nlink(inode, 1);
+			inode->i_size = ent_oi->u.prop->length;
+			break;
+		}
+		unlock_new_inode(inode);
+	}
+
+	return d_splice_alias(inode, dentry);
+}
+
+static int openpromfs_readdir(struct file *file, struct dir_context *ctx)
+{
+	struct inode *inode = file_inode(file);
+	struct op_inode_info *oi = OP_I(inode);
+	struct device_node *dp = oi->u.node;
+	struct device_node *child;
+	struct property *prop;
+	int i;
+
+	mutex_lock(&op_mutex);
+	
+	if (ctx->pos == 0) {
+		if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
+			goto out;
+		ctx->pos = 1;
+	}
+	if (ctx->pos == 1) {
+		if (!dir_emit(ctx, "..", 2,
+			    (dp->parent == NULL ?
+			     OPENPROM_ROOT_INO :
+			     dp->parent->unique_id), DT_DIR))
+			goto out;
+		ctx->pos = 2;
+	}
+	i = ctx->pos - 2;
+
+	/* First, the children nodes as directories.  */
+	child = dp->child;
+	while (i && child) {
+		child = child->sibling;
+		i--;
+	}
+	while (child) {
+		if (!dir_emit(ctx,
+			    kbasename(child->full_name),
+			    strlen(kbasename(child->full_name)),
+			    child->unique_id, DT_DIR))
+			goto out;
+
+		ctx->pos++;
+		child = child->sibling;
+	}
+
+	/* Next, the properties as files.  */
+	prop = dp->properties;
+	while (i && prop) {
+		prop = prop->next;
+		i--;
+	}
+	while (prop) {
+		if (!dir_emit(ctx, prop->name, strlen(prop->name),
+			    prop->unique_id, DT_REG))
+			goto out;
+
+		ctx->pos++;
+		prop = prop->next;
+	}
+
+out:
+	mutex_unlock(&op_mutex);
+	return 0;
+}
+
+static struct kmem_cache *op_inode_cachep;
+
+static struct inode *openprom_alloc_inode(struct super_block *sb)
+{
+	struct op_inode_info *oi;
+
+	oi = alloc_inode_sb(sb, op_inode_cachep, GFP_KERNEL);
+	if (!oi)
+		return NULL;
+
+	return &oi->vfs_inode;
+}
+
+static void openprom_free_inode(struct inode *inode)
+{
+	kmem_cache_free(op_inode_cachep, OP_I(inode));
+}
+
+static struct inode *openprom_iget(struct super_block *sb, ino_t ino)
+{
+	struct inode *inode = iget_locked(sb, ino);
+	if (!inode)
+		inode = ERR_PTR(-ENOMEM);
+	return inode;
+}
+
+static int openpromfs_reconfigure(struct fs_context *fc)
+{
+	sync_filesystem(fc->root->d_sb);
+	fc->sb_flags |= SB_NOATIME;
+	return 0;
+}
+
+static const struct super_operations openprom_sops = {
+	.alloc_inode	= openprom_alloc_inode,
+	.free_inode	= openprom_free_inode,
+	.statfs		= simple_statfs,
+};
+
+static int openprom_fill_super(struct super_block *s, struct fs_context *fc)
+{
+	struct inode *root_inode;
+	struct op_inode_info *oi;
+	int ret;
+
+	s->s_flags |= SB_NOATIME;
+	s->s_blocksize = 1024;
+	s->s_blocksize_bits = 10;
+	s->s_magic = OPENPROM_SUPER_MAGIC;
+	s->s_op = &openprom_sops;
+	s->s_time_gran = 1;
+	root_inode = openprom_iget(s, OPENPROM_ROOT_INO);
+	if (IS_ERR(root_inode)) {
+		ret = PTR_ERR(root_inode);
+		goto out_no_root;
+	}
+
+	simple_inode_init_ts(root_inode);
+	root_inode->i_op = &openprom_inode_operations;
+	root_inode->i_fop = &openprom_operations;
+	root_inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
+	oi = OP_I(root_inode);
+	oi->type = op_inode_node;
+	oi->u.node = of_find_node_by_path("/");
+	unlock_new_inode(root_inode);
+
+	s->s_root = d_make_root(root_inode);
+	if (!s->s_root)
+		goto out_no_root_dentry;
+	return 0;
+
+out_no_root_dentry:
+	ret = -ENOMEM;
+out_no_root:
+	printk("openprom_fill_super: get root inode failed\n");
+	return ret;
+}
+
+static int openpromfs_get_tree(struct fs_context *fc)
+{
+	return get_tree_single(fc, openprom_fill_super);
+}
+
+static const struct fs_context_operations openpromfs_context_ops = {
+	.get_tree	= openpromfs_get_tree,
+	.reconfigure	= openpromfs_reconfigure,
+};
+
+static int openpromfs_init_fs_context(struct fs_context *fc)
+{
+	fc->ops = &openpromfs_context_ops;
+	return 0;
+}
+
+static struct file_system_type openprom_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "openpromfs",
+	.init_fs_context = openpromfs_init_fs_context,
+	.kill_sb	= kill_anon_super,
+};
+MODULE_ALIAS_FS("openpromfs");
+
+static void op_inode_init_once(void *data)
+{
+	struct op_inode_info *oi = (struct op_inode_info *) data;
+
+	inode_init_once(&oi->vfs_inode);
+}
+
+static int __init init_openprom_fs(void)
+{
+	int err;
+
+	op_inode_cachep = kmem_cache_create("op_inode_cache",
+					    sizeof(struct op_inode_info),
+					    0,
+					    (SLAB_RECLAIM_ACCOUNT |
+					     SLAB_ACCOUNT),
+					    op_inode_init_once);
+	if (!op_inode_cachep)
+		return -ENOMEM;
+
+	err = register_filesystem(&openprom_fs_type);
+	if (err)
+		kmem_cache_destroy(op_inode_cachep);
+
+	return err;
+}
+
+static void __exit exit_openprom_fs(void)
+{
+	unregister_filesystem(&openprom_fs_type);
+	/*
+	 * Make sure all delayed rcu free inodes are flushed before we
+	 * destroy cache.
+	 */
+	rcu_barrier();
+	kmem_cache_destroy(op_inode_cachep);
+}
+
+module_init(init_openprom_fs)
+module_exit(exit_openprom_fs)
+MODULE_DESCRIPTION("OpenPROM filesystem support");
+MODULE_LICENSE("GPL");