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, 319 insertions, 0 deletions

diff --git a/drivers/char/misc.c b/drivers/char/misc.c
new file mode 100644
index 000000000..726516fb0
--- /dev/null
+++ b/drivers/char/misc.c
@@ -0,0 +1,319 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/drivers/char/misc.c
+ *
+ * Generic misc open routine by Johan Myreen
+ *
+ * Based on code from Linus
+ *
+ * Teemu Rantanen's Microsoft Busmouse support and Derrick Cole's
+ *   changes incorporated into 0.97pl4
+ *   by Peter Cervasio (pete%q106fm.uucp@wupost.wustl.edu) (08SEP92)
+ *   See busmouse.c for particulars.
+ *
+ * Made things a lot mode modular - easy to compile in just one or two
+ * of the misc drivers, as they are now completely independent. Linus.
+ *
+ * Support for loadable modules. 8-Sep-95 Philip Blundell <pjb27@cam.ac.uk>
+ *
+ * Fixed a failing symbol register to free the device registration
+ *		Alan Cox <alan@lxorguk.ukuu.org.uk> 21-Jan-96
+ *
+ * Dynamic minors and /proc/mice by Alessandro Rubini. 26-Mar-96
+ *
+ * Renamed to misc and miscdevice to be more accurate. Alan Cox 26-Mar-96
+ *
+ * Handling of mouse minor numbers for kerneld:
+ *  Idea by Jacques Gelinas <jack@solucorp.qc.ca>,
+ *  adapted by Bjorn Ekwall <bj0rn@blox.se>
+ *  corrected by Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *
+ * Changes for kmod (from kerneld):
+ *	Cyrus Durgin <cider@speakeasy.org>
+ *
+ * Added devfs support. Richard Gooch <rgooch@atnf.csiro.au>  10-Jan-1998
+ */
+
+#include <linux/module.h>
+
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/mutex.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/tty.h>
+#include <linux/kmod.h>
+#include <linux/gfp.h>
+
+/*
+ * Head entry for the doubly linked miscdevice list
+ */
+static LIST_HEAD(misc_list);
+static DEFINE_MUTEX(misc_mtx);
+
+/*
+ * Assigned numbers.
+ */
+static DEFINE_IDA(misc_minors_ida);
+
+static int misc_minor_alloc(int minor)
+{
+	int ret = 0;
+
+	if (minor == MISC_DYNAMIC_MINOR) {
+		/* allocate free id */
+		ret = ida_alloc_range(&misc_minors_ida, MISC_DYNAMIC_MINOR + 1,
+				      MINORMASK, GFP_KERNEL);
+	} else {
+		ret = ida_alloc_range(&misc_minors_ida, minor, minor, GFP_KERNEL);
+	}
+	return ret;
+}
+
+static void misc_minor_free(int minor)
+{
+	ida_free(&misc_minors_ida, minor);
+}
+
+#ifdef CONFIG_PROC_FS
+static void *misc_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	mutex_lock(&misc_mtx);
+	return seq_list_start(&misc_list, *pos);
+}
+
+static void *misc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	return seq_list_next(v, &misc_list, pos);
+}
+
+static void misc_seq_stop(struct seq_file *seq, void *v)
+{
+	mutex_unlock(&misc_mtx);
+}
+
+static int misc_seq_show(struct seq_file *seq, void *v)
+{
+	const struct miscdevice *p = list_entry(v, struct miscdevice, list);
+
+	seq_printf(seq, "%3i %s\n", p->minor, p->name ? p->name : "");
+	return 0;
+}
+
+
+static const struct seq_operations misc_seq_ops = {
+	.start = misc_seq_start,
+	.next  = misc_seq_next,
+	.stop  = misc_seq_stop,
+	.show  = misc_seq_show,
+};
+#endif
+
+static int misc_open(struct inode *inode, struct file *file)
+{
+	int minor = iminor(inode);
+	struct miscdevice *c = NULL, *iter;
+	int err = -ENODEV;
+	const struct file_operations *new_fops = NULL;
+
+	mutex_lock(&misc_mtx);
+
+	list_for_each_entry(iter, &misc_list, list) {
+		if (iter->minor != minor)
+			continue;
+		c = iter;
+		new_fops = fops_get(iter->fops);
+		break;
+	}
+
+	/* Only request module for fixed minor code */
+	if (!new_fops && minor < MISC_DYNAMIC_MINOR) {
+		mutex_unlock(&misc_mtx);
+		request_module("char-major-%d-%d", MISC_MAJOR, minor);
+		mutex_lock(&misc_mtx);
+
+		list_for_each_entry(iter, &misc_list, list) {
+			if (iter->minor != minor)
+				continue;
+			c = iter;
+			new_fops = fops_get(iter->fops);
+			break;
+		}
+	}
+
+	if (!new_fops)
+		goto fail;
+
+	/*
+	 * Place the miscdevice in the file's
+	 * private_data so it can be used by the
+	 * file operations, including f_op->open below
+	 */
+	file->private_data = c;
+
+	err = 0;
+	replace_fops(file, new_fops);
+	if (file->f_op->open)
+		err = file->f_op->open(inode, file);
+fail:
+	mutex_unlock(&misc_mtx);
+	return err;
+}
+
+static char *misc_devnode(const struct device *dev, umode_t *mode)
+{
+	const struct miscdevice *c = dev_get_drvdata(dev);
+
+	if (mode && c->mode)
+		*mode = c->mode;
+	if (c->nodename)
+		return kstrdup(c->nodename, GFP_KERNEL);
+	return NULL;
+}
+
+static const struct class misc_class = {
+	.name		= "misc",
+	.devnode	= misc_devnode,
+};
+
+static const struct file_operations misc_fops = {
+	.owner		= THIS_MODULE,
+	.open		= misc_open,
+	.llseek		= noop_llseek,
+};
+
+/**
+ *	misc_register	-	register a miscellaneous device
+ *	@misc: device structure
+ *
+ *	Register a miscellaneous device with the kernel. If the minor
+ *	number is set to %MISC_DYNAMIC_MINOR a minor number is assigned
+ *	and placed in the minor field of the structure. For other cases
+ *	the minor number requested is used.
+ *
+ *	The structure passed is linked into the kernel and may not be
+ *	destroyed until it has been unregistered. By default, an open()
+ *	syscall to the device sets file->private_data to point to the
+ *	structure. Drivers don't need open in fops for this.
+ *
+ *	A zero is returned on success and a negative errno code for
+ *	failure.
+ */
+
+int misc_register(struct miscdevice *misc)
+{
+	dev_t dev;
+	int err = 0;
+	bool is_dynamic = (misc->minor == MISC_DYNAMIC_MINOR);
+
+	if (misc->minor > MISC_DYNAMIC_MINOR) {
+		pr_err("Invalid fixed minor %d for miscdevice '%s'\n",
+		       misc->minor, misc->name);
+		return -EINVAL;
+	}
+
+	INIT_LIST_HEAD(&misc->list);
+
+	mutex_lock(&misc_mtx);
+
+	if (is_dynamic) {
+		int i = misc_minor_alloc(misc->minor);
+
+		if (i < 0) {
+			err = -EBUSY;
+			goto out;
+		}
+		misc->minor = i;
+	} else {
+		struct miscdevice *c;
+		int i;
+
+		list_for_each_entry(c, &misc_list, list) {
+			if (c->minor == misc->minor) {
+				err = -EBUSY;
+				goto out;
+			}
+		}
+
+		i = misc_minor_alloc(misc->minor);
+		if (i < 0) {
+			err = -EBUSY;
+			goto out;
+		}
+	}
+
+	dev = MKDEV(MISC_MAJOR, misc->minor);
+
+	misc->this_device =
+		device_create_with_groups(&misc_class, misc->parent, dev,
+					  misc, misc->groups, "%s", misc->name);
+	if (IS_ERR(misc->this_device)) {
+		misc_minor_free(misc->minor);
+		if (is_dynamic) {
+			misc->minor = MISC_DYNAMIC_MINOR;
+		}
+		err = PTR_ERR(misc->this_device);
+		goto out;
+	}
+
+	/*
+	 * Add it to the front, so that later devices can "override"
+	 * earlier defaults
+	 */
+	list_add(&misc->list, &misc_list);
+ out:
+	mutex_unlock(&misc_mtx);
+	return err;
+}
+EXPORT_SYMBOL(misc_register);
+
+/**
+ *	misc_deregister - unregister a miscellaneous device
+ *	@misc: device to unregister
+ *
+ *	Unregister a miscellaneous device that was previously
+ *	successfully registered with misc_register().
+ */
+
+void misc_deregister(struct miscdevice *misc)
+{
+	mutex_lock(&misc_mtx);
+	list_del_init(&misc->list);
+	device_destroy(&misc_class, MKDEV(MISC_MAJOR, misc->minor));
+	misc_minor_free(misc->minor);
+	if (misc->minor > MISC_DYNAMIC_MINOR)
+		misc->minor = MISC_DYNAMIC_MINOR;
+	mutex_unlock(&misc_mtx);
+}
+EXPORT_SYMBOL(misc_deregister);
+
+static int __init misc_init(void)
+{
+	int err;
+	struct proc_dir_entry *misc_proc_file;
+
+	misc_proc_file = proc_create_seq("misc", 0, NULL, &misc_seq_ops);
+	err = class_register(&misc_class);
+	if (err)
+		goto fail_remove;
+
+	err = __register_chrdev(MISC_MAJOR, 0, MINORMASK + 1, "misc", &misc_fops);
+	if (err < 0)
+		goto fail_printk;
+	return 0;
+
+fail_printk:
+	pr_err("unable to get major %d for misc devices\n", MISC_MAJOR);
+	class_unregister(&misc_class);
+fail_remove:
+	if (misc_proc_file)
+		remove_proc_entry("misc", NULL);
+	return err;
+}
+subsys_initcall(misc_init);