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, 148 insertions, 0 deletions

diff --git a/fs/fuse/req_timeout.c b/fs/fuse/req_timeout.c
new file mode 100644
index 000000000..6cc6fc491
--- /dev/null
+++ b/fs/fuse/req_timeout.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "dev.h"
+#include "sysctl.h"
+#include "fuse_dev_i.h"
+#include "dev_uring_i.h"
+
+/* Frequency (in seconds) of request timeout checks, if opted into */
+#define FUSE_TIMEOUT_TIMER_FREQ 15
+
+/* Frequency (in jiffies) of request timeout checks, if opted into */
+static const unsigned long fuse_timeout_timer_freq =
+	secs_to_jiffies(FUSE_TIMEOUT_TIMER_FREQ);
+
+/*
+ * Default timeout (in seconds) for the server to reply to a request
+ * before the connection is aborted, if no timeout was specified on mount.
+ *
+ * Exported via sysctl
+ */
+unsigned int fuse_default_req_timeout;
+
+/*
+ * Max timeout (in seconds) for the server to reply to a request before
+ * the connection is aborted.
+ *
+ * Exported via sysctl
+ */
+unsigned int fuse_max_req_timeout;
+
+bool fuse_request_expired(struct fuse_chan *fch, struct list_head *list)
+{
+	struct fuse_req *req;
+
+	req = list_first_entry_or_null(list, struct fuse_req, list);
+	if (!req)
+		return false;
+	return time_is_before_jiffies(req->create_time + fch->timeout.req_timeout);
+}
+
+static bool fuse_fpq_processing_expired(struct fuse_chan *fch, struct list_head *processing)
+{
+	int i;
+
+	for (i = 0; i < FUSE_PQ_HASH_SIZE; i++)
+		if (fuse_request_expired(fch, &processing[i]))
+			return true;
+
+	return false;
+}
+
+/*
+ * Check if any requests aren't being completed by the time the request timeout
+ * elapses. To do so, we:
+ * - check the fiq pending list
+ * - check the bg queue
+ * - check the fpq io and processing lists
+ *
+ * To make this fast, we only check against the head request on each list since
+ * these are generally queued in order of creation time (eg newer requests get
+ * queued to the tail). We might miss a few edge cases (eg requests transitioning
+ * between lists, re-sent requests at the head of the pending list having a
+ * later creation time than other requests on that list, etc.) but that is fine
+ * since if the request never gets fulfilled, it will eventually be caught.
+ */
+static void fuse_check_timeout(struct work_struct *work)
+{
+	struct delayed_work *dwork = to_delayed_work(work);
+	struct fuse_chan *fch = container_of(dwork, struct fuse_chan, timeout.work);
+	struct fuse_iqueue *fiq = &fch->iq;
+	struct fuse_dev *fud;
+	struct fuse_pqueue *fpq;
+	bool expired = false;
+
+	if (!atomic_read(&fch->num_waiting))
+		goto out;
+
+	spin_lock(&fiq->lock);
+	expired = fuse_request_expired(fch, &fiq->pending);
+	spin_unlock(&fiq->lock);
+	if (expired)
+		goto chan_abort;
+
+	spin_lock(&fch->bg_lock);
+	expired = fuse_request_expired(fch, &fch->bg_queue);
+	spin_unlock(&fch->bg_lock);
+	if (expired)
+		goto chan_abort;
+
+	spin_lock(&fch->lock);
+	if (!fch->connected) {
+		spin_unlock(&fch->lock);
+		return;
+	}
+	list_for_each_entry(fud, &fch->devices, entry) {
+		fpq = &fud->pq;
+		spin_lock(&fpq->lock);
+		if (fuse_request_expired(fch, &fpq->io) ||
+		    fuse_fpq_processing_expired(fch, fpq->processing)) {
+			spin_unlock(&fpq->lock);
+			spin_unlock(&fch->lock);
+			goto chan_abort;
+		}
+
+		spin_unlock(&fpq->lock);
+	}
+	spin_unlock(&fch->lock);
+
+	if (fuse_uring_request_expired(fch))
+		goto chan_abort;
+
+out:
+	queue_delayed_work(system_percpu_wq, &fch->timeout.work,
+			   fuse_timeout_timer_freq);
+	return;
+
+chan_abort:
+	fuse_chan_abort(fch, false);
+}
+
+static void set_request_timeout(struct fuse_chan *fch, unsigned int timeout)
+{
+	fch->timeout.req_timeout = secs_to_jiffies(timeout);
+	INIT_DELAYED_WORK(&fch->timeout.work, fuse_check_timeout);
+	queue_delayed_work(system_percpu_wq, &fch->timeout.work,
+			   fuse_timeout_timer_freq);
+}
+
+void fuse_init_server_timeout(struct fuse_chan *fch, unsigned int timeout)
+{
+	if (!timeout && !fuse_max_req_timeout && !fuse_default_req_timeout)
+		return;
+
+	if (!timeout)
+		timeout = fuse_default_req_timeout;
+
+	if (fuse_max_req_timeout) {
+		if (timeout)
+			timeout = min(fuse_max_req_timeout, timeout);
+		else
+			timeout = fuse_max_req_timeout;
+	}
+
+	timeout = max(FUSE_TIMEOUT_TIMER_FREQ, timeout);
+
+	set_request_timeout(fch, timeout);
+}
+