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, 446 insertions, 0 deletions

diff --git a/fs/fuse/notify.c b/fs/fuse/notify.c
new file mode 100644
index 000000000..1ba763705
--- /dev/null
+++ b/fs/fuse/notify.c
@@ -0,0 +1,446 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "dev.h"
+#include "fuse_i.h"
+
+#include <linux/iomap.h>
+#include <linux/pagemap.h>
+
+static int fuse_notify_poll(struct fuse_conn *fc, unsigned int size,
+			    struct fuse_copy_state *cs)
+{
+	struct fuse_notify_poll_wakeup_out outarg;
+	int err;
+
+	if (size != sizeof(outarg))
+		return -EINVAL;
+
+	err = fuse_copy_one(cs, &outarg, sizeof(outarg));
+	if (err)
+		return err;
+
+	fuse_copy_finish(cs);
+	return fuse_notify_poll_wakeup(fc, &outarg);
+}
+
+static int fuse_notify_inval_inode(struct fuse_conn *fc, unsigned int size,
+				   struct fuse_copy_state *cs)
+{
+	struct fuse_notify_inval_inode_out outarg;
+	int err;
+
+	if (size != sizeof(outarg))
+		return -EINVAL;
+
+	err = fuse_copy_one(cs, &outarg, sizeof(outarg));
+	if (err)
+		return err;
+	fuse_copy_finish(cs);
+
+	down_read(&fc->killsb);
+	err = fuse_reverse_inval_inode(fc, outarg.ino,
+				       outarg.off, outarg.len);
+	up_read(&fc->killsb);
+	return err;
+}
+
+static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size,
+				   struct fuse_copy_state *cs)
+{
+	struct fuse_notify_inval_entry_out outarg;
+	int err;
+	char *buf;
+	struct qstr name;
+
+	if (size < sizeof(outarg))
+		return -EINVAL;
+
+	err = fuse_copy_one(cs, &outarg, sizeof(outarg));
+	if (err)
+		return err;
+
+	if (outarg.namelen > fc->name_max)
+		return -ENAMETOOLONG;
+
+	err = -EINVAL;
+	if (size != sizeof(outarg) + outarg.namelen + 1)
+		return -EINVAL;
+
+	buf = kzalloc(outarg.namelen + 1, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	name.name = buf;
+	name.len = outarg.namelen;
+	err = fuse_copy_one(cs, buf, outarg.namelen + 1);
+	if (err)
+		goto err;
+	fuse_copy_finish(cs);
+	buf[outarg.namelen] = 0;
+
+	down_read(&fc->killsb);
+	err = fuse_reverse_inval_entry(fc, outarg.parent, 0, &name, outarg.flags);
+	up_read(&fc->killsb);
+err:
+	kfree(buf);
+	return err;
+}
+
+static int fuse_notify_delete(struct fuse_conn *fc, unsigned int size,
+			      struct fuse_copy_state *cs)
+{
+	struct fuse_notify_delete_out outarg;
+	int err;
+	char *buf;
+	struct qstr name;
+
+	if (size < sizeof(outarg))
+		return -EINVAL;
+
+	err = fuse_copy_one(cs, &outarg, sizeof(outarg));
+	if (err)
+		return err;
+
+	if (outarg.namelen > fc->name_max)
+		return -ENAMETOOLONG;
+
+	if (size != sizeof(outarg) + outarg.namelen + 1)
+		return -EINVAL;
+
+	buf = kzalloc(outarg.namelen + 1, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	name.name = buf;
+	name.len = outarg.namelen;
+	err = fuse_copy_one(cs, buf, outarg.namelen + 1);
+	if (err)
+		goto err;
+	fuse_copy_finish(cs);
+	buf[outarg.namelen] = 0;
+
+	down_read(&fc->killsb);
+	err = fuse_reverse_inval_entry(fc, outarg.parent, outarg.child, &name, 0);
+	up_read(&fc->killsb);
+err:
+	kfree(buf);
+	return err;
+}
+
+static int fuse_notify_store(struct fuse_conn *fc, unsigned int size,
+			     struct fuse_copy_state *cs)
+{
+	struct fuse_notify_store_out outarg;
+	struct inode *inode;
+	struct address_space *mapping;
+	u64 nodeid;
+	int err;
+	unsigned int num;
+	loff_t file_size;
+	loff_t pos;
+	loff_t end;
+
+	if (size < sizeof(outarg))
+		return -EINVAL;
+
+	err = fuse_copy_one(cs, &outarg, sizeof(outarg));
+	if (err)
+		return err;
+
+	if (size - sizeof(outarg) != outarg.size)
+		return -EINVAL;
+
+	if (outarg.offset >= MAX_LFS_FILESIZE)
+		return -EINVAL;
+
+	nodeid = outarg.nodeid;
+	pos = outarg.offset;
+	num = min(outarg.size, MAX_LFS_FILESIZE - pos);
+
+	down_read(&fc->killsb);
+
+	err = -ENOENT;
+	inode = fuse_ilookup(fc, nodeid,  NULL);
+	if (!inode)
+		goto out_up_killsb;
+	if (!S_ISREG(inode->i_mode)) {
+		err = -EINVAL;
+		goto out_iput;
+	}
+
+	mapping = inode->i_mapping;
+	file_size = i_size_read(inode);
+	end = pos + num;
+	if (end > file_size) {
+		file_size = end;
+		fuse_write_update_attr(inode, file_size, num);
+	}
+
+	while (num) {
+		struct folio *folio;
+		unsigned int folio_offset;
+		unsigned int nr_bytes;
+		pgoff_t index = pos >> PAGE_SHIFT;
+
+		folio = filemap_grab_folio(mapping, index);
+		err = PTR_ERR(folio);
+		if (IS_ERR(folio))
+			goto out_iput;
+
+		folio_offset = offset_in_folio(folio, pos);
+		nr_bytes = min(num, folio_size(folio) - folio_offset);
+
+		err = fuse_copy_folio(cs, &folio, folio_offset, nr_bytes, 0);
+		if (!folio_test_uptodate(folio) && !err && folio_offset == 0 &&
+		    (nr_bytes == folio_size(folio) || file_size == end)) {
+			folio_zero_segment(folio, nr_bytes, folio_size(folio));
+			iomap_folio_mark_uptodate(folio);
+		}
+		folio_unlock(folio);
+		folio_put(folio);
+
+		if (err)
+			goto out_iput;
+
+		pos += nr_bytes;
+		num -= nr_bytes;
+	}
+
+	err = 0;
+
+out_iput:
+	iput(inode);
+out_up_killsb:
+	up_read(&fc->killsb);
+	return err;
+}
+
+struct fuse_retrieve_args {
+	struct fuse_args_pages ap;
+	struct fuse_notify_retrieve_in inarg;
+};
+
+static void fuse_retrieve_end(struct fuse_args *args, int error)
+{
+	struct fuse_retrieve_args *ra =
+		container_of(args, typeof(*ra), ap.args);
+
+	release_pages(ra->ap.folios, ra->ap.num_folios);
+	kfree(ra);
+}
+
+static int fuse_retrieve(struct fuse_mount *fm, struct inode *inode,
+			 struct fuse_notify_retrieve_out *outarg)
+{
+	int err;
+	struct address_space *mapping = inode->i_mapping;
+	loff_t file_size;
+	unsigned int num;
+	unsigned int offset;
+	size_t total_len = 0;
+	unsigned int num_pages;
+	struct fuse_conn *fc = fm->fc;
+	struct fuse_retrieve_args *ra;
+	size_t args_size = sizeof(*ra);
+	struct fuse_args_pages *ap;
+	struct fuse_args *args;
+	loff_t pos = outarg->offset;
+
+	offset = offset_in_page(pos);
+	file_size = i_size_read(inode);
+
+	num = min(outarg->size, fc->max_write);
+	if (pos > file_size)
+		num = 0;
+	else if (num > file_size - pos)
+		num = file_size - pos;
+
+	num_pages = DIV_ROUND_UP(num + offset, PAGE_SIZE);
+	num_pages = min(num_pages, fc->max_pages);
+	num = min(num, num_pages << PAGE_SHIFT);
+
+	args_size += num_pages * (sizeof(ap->folios[0]) + sizeof(ap->descs[0]));
+
+	ra = kzalloc(args_size, GFP_KERNEL);
+	if (!ra)
+		return -ENOMEM;
+
+	ap = &ra->ap;
+	ap->folios = (void *) (ra + 1);
+	ap->descs = (void *) (ap->folios + num_pages);
+
+	args = &ap->args;
+	args->nodeid = outarg->nodeid;
+	args->opcode = FUSE_NOTIFY_REPLY;
+	args->in_numargs = 3;
+	args->in_pages = true;
+	args->end = fuse_retrieve_end;
+
+	while (num && ap->num_folios < num_pages) {
+		struct folio *folio;
+		unsigned int folio_offset;
+		unsigned int nr_bytes;
+		pgoff_t index = pos >> PAGE_SHIFT;
+
+		folio = filemap_get_folio(mapping, index);
+		if (IS_ERR(folio))
+			break;
+		if (!folio_test_uptodate(folio)) {
+			folio_put(folio);
+			break;
+		}
+
+		folio_offset = offset_in_folio(folio, pos);
+		nr_bytes = min(folio_size(folio) - folio_offset, num);
+
+		ap->folios[ap->num_folios] = folio;
+		ap->descs[ap->num_folios].offset = folio_offset;
+		ap->descs[ap->num_folios].length = nr_bytes;
+		ap->num_folios++;
+
+		pos += nr_bytes;
+		num -= nr_bytes;
+		total_len += nr_bytes;
+	}
+	ra->inarg.offset = outarg->offset;
+	ra->inarg.size = total_len;
+	fuse_set_zero_arg0(args);
+	args->in_args[1].size = sizeof(ra->inarg);
+	args->in_args[1].value = &ra->inarg;
+	args->in_args[2].size = total_len;
+
+	err = fuse_simple_notify_reply(fm, args, outarg->notify_unique);
+	if (err)
+		fuse_retrieve_end(args, err);
+
+	return err;
+}
+
+static int fuse_notify_retrieve(struct fuse_conn *fc, unsigned int size,
+				struct fuse_copy_state *cs)
+{
+	struct fuse_notify_retrieve_out outarg;
+	struct fuse_mount *fm;
+	struct inode *inode;
+	u64 nodeid;
+	int err;
+
+	if (size != sizeof(outarg))
+		return -EINVAL;
+
+	err = fuse_copy_one(cs, &outarg, sizeof(outarg));
+	if (err)
+		return err;
+
+	fuse_copy_finish(cs);
+
+	if (outarg.offset >= MAX_LFS_FILESIZE)
+		return -EINVAL;
+
+	down_read(&fc->killsb);
+	err = -ENOENT;
+	nodeid = outarg.nodeid;
+
+	inode = fuse_ilookup(fc, nodeid, &fm);
+	if (inode) {
+		err = -EINVAL;
+		if (S_ISREG(inode->i_mode))
+			err = fuse_retrieve(fm, inode, &outarg);
+		iput(inode);
+	}
+	up_read(&fc->killsb);
+
+	return err;
+}
+
+static int fuse_notify_resend(struct fuse_conn *fc)
+{
+	fuse_chan_resend(fc->chan);
+	return 0;
+}
+
+/*
+ * Increments the fuse connection epoch.  This will cause dentries and
+ * readdir caches from previous epochs to be invalidated.  Additionally,
+ * if inval_wq is set, a work queue is scheduled to trigger the invalidation.
+ */
+static int fuse_notify_inc_epoch(struct fuse_conn *fc)
+{
+	atomic_inc(&fc->epoch);
+	if (inval_wq)
+		schedule_work(&fc->epoch_work);
+
+	return 0;
+}
+
+static int fuse_notify_prune(struct fuse_conn *fc, unsigned int size,
+			     struct fuse_copy_state *cs)
+{
+	struct fuse_notify_prune_out outarg;
+	const unsigned int batch = 512;
+	u64 *nodeids __free(kfree) = kmalloc(sizeof(u64) * batch, GFP_KERNEL);
+	unsigned int num, i;
+	int err;
+
+	if (!nodeids)
+		return -ENOMEM;
+
+	if (size < sizeof(outarg))
+		return -EINVAL;
+
+	err = fuse_copy_one(cs, &outarg, sizeof(outarg));
+	if (err)
+		return err;
+
+	if (size - sizeof(outarg) != array_size(outarg.count, sizeof(u64)))
+		return -EINVAL;
+
+	for (; outarg.count; outarg.count -= num) {
+		num = min(batch, outarg.count);
+		err = fuse_copy_one(cs, nodeids, num * sizeof(u64));
+		if (err)
+			return err;
+
+		scoped_guard(rwsem_read, &fc->killsb) {
+			for (i = 0; i < num; i++)
+				fuse_try_prune_one_inode(fc, nodeids[i]);
+		}
+	}
+	return 0;
+}
+
+int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
+		unsigned int size, struct fuse_copy_state *cs)
+{
+	switch (code) {
+	case FUSE_NOTIFY_POLL:
+		return fuse_notify_poll(fc, size, cs);
+
+	case FUSE_NOTIFY_INVAL_INODE:
+		return fuse_notify_inval_inode(fc, size, cs);
+
+	case FUSE_NOTIFY_INVAL_ENTRY:
+		return fuse_notify_inval_entry(fc, size, cs);
+
+	case FUSE_NOTIFY_STORE:
+		return fuse_notify_store(fc, size, cs);
+
+	case FUSE_NOTIFY_RETRIEVE:
+		return fuse_notify_retrieve(fc, size, cs);
+
+	case FUSE_NOTIFY_DELETE:
+		return fuse_notify_delete(fc, size, cs);
+
+	case FUSE_NOTIFY_RESEND:
+		return fuse_notify_resend(fc);
+
+	case FUSE_NOTIFY_INC_EPOCH:
+		return fuse_notify_inc_epoch(fc);
+
+	case FUSE_NOTIFY_PRUNE:
+		return fuse_notify_prune(fc, size, cs);
+
+	default:
+		return -EINVAL;
+	}
+}