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, 127 insertions, 0 deletions

diff --git a/block/bio-integrity-auto.c b/block/bio-integrity-auto.c
new file mode 100644
index 000000000..9456dcffd
--- /dev/null
+++ b/block/bio-integrity-auto.c
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2007, 2008, 2009 Oracle Corporation
+ * Written by: Martin K. Petersen <martin.petersen@oracle.com>
+ *
+ * Automatically generate and verify integrity data on PI capable devices if the
+ * bio submitter didn't provide PI itself.  This ensures that kernel verifies
+ * data integrity even if the file system (or other user of the block device) is
+ * not aware of PI.
+ */
+#include <linux/blk-integrity.h>
+#include <linux/t10-pi.h>
+#include <linux/workqueue.h>
+#include "blk.h"
+
+struct bio_integrity_data {
+	struct bio			*bio;
+	struct bvec_iter		saved_bio_iter;
+	struct work_struct		work;
+	struct bio_integrity_payload	bip;
+	struct bio_vec			bvec;
+};
+
+static struct kmem_cache *bid_slab;
+static mempool_t bid_pool;
+static struct workqueue_struct *kintegrityd_wq;
+
+static void bio_integrity_finish(struct bio_integrity_data *bid)
+{
+	bid->bio->bi_integrity = NULL;
+	bid->bio->bi_opf &= ~REQ_INTEGRITY;
+	bio_integrity_free_buf(&bid->bip);
+	mempool_free(bid, &bid_pool);
+}
+
+static void bio_integrity_verify_fn(struct work_struct *work)
+{
+	struct bio_integrity_data *bid =
+		container_of(work, struct bio_integrity_data, work);
+	struct bio *bio = bid->bio;
+
+	bio->bi_status = bio_integrity_verify(bio, &bid->saved_bio_iter);
+	bio_integrity_finish(bid);
+	bio_endio(bio);
+}
+
+/**
+ * __bio_integrity_endio - Integrity I/O completion function
+ * @bio:	Protected bio
+ *
+ * Normally I/O completion is done in interrupt context.  However, verifying I/O
+ * integrity is a time-consuming task which must be run in process context.
+ *
+ * This function postpones completion accordingly.
+ */
+bool __bio_integrity_endio(struct bio *bio)
+{
+	struct bio_integrity_payload *bip = bio_integrity(bio);
+	struct bio_integrity_data *bid =
+		container_of(bip, struct bio_integrity_data, bip);
+
+	if (bio_op(bio) == REQ_OP_READ && !bio->bi_status &&
+	    (bip->bip_flags & BIP_CHECK_FLAGS)) {
+		INIT_WORK(&bid->work, bio_integrity_verify_fn);
+		queue_work(kintegrityd_wq, &bid->work);
+		return false;
+	}
+
+	bio_integrity_finish(bid);
+	return true;
+}
+
+/**
+ * bio_integrity_prep - Prepare bio for integrity I/O
+ * @bio:	bio to prepare
+ * @action:	preparation action needed (BI_ACT_*)
+ *
+ * Allocate the integrity payload.  For writes, generate the integrity metadata
+ * and for reads, setup the completion handler to verify the metadata.
+ *
+ * This is used for bios that do not have user integrity payloads attached.
+ */
+void bio_integrity_prep(struct bio *bio, unsigned int action)
+{
+	struct bio_integrity_data *bid;
+
+	bid = mempool_alloc(&bid_pool, GFP_NOIO);
+	bio_integrity_init(bio, &bid->bip, &bid->bvec, 1);
+	bid->bio = bio;
+	bid->bip.bip_flags |= BIP_BLOCK_INTEGRITY;
+	bio_integrity_alloc_buf(bio, GFP_NOIO, action & BI_ACT_ZERO);
+	if (action & BI_ACT_CHECK)
+		bio_integrity_setup_default(bio);
+
+	/* Auto-generate integrity metadata if this is a write */
+	if (bio_data_dir(bio) == WRITE && (bid->bip.bip_flags & BIP_CHECK_FLAGS))
+		bio_integrity_generate(bio);
+	else
+		bid->saved_bio_iter = bio->bi_iter;
+}
+EXPORT_SYMBOL(bio_integrity_prep);
+
+void blk_flush_integrity(void)
+{
+	flush_workqueue(kintegrityd_wq);
+}
+
+static int __init blk_integrity_auto_init(void)
+{
+	bid_slab = kmem_cache_create("bio_integrity_data",
+			sizeof(struct bio_integrity_data), 0,
+			SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
+
+	if (mempool_init_slab_pool(&bid_pool, BIO_POOL_SIZE, bid_slab))
+		panic("bio: can't create integrity pool\n");
+
+	/*
+	 * kintegrityd won't block much but may burn a lot of CPU cycles.
+	 * Make it highpri CPU intensive wq with max concurrency of 1.
+	 */
+	kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM |
+					 WQ_HIGHPRI | WQ_CPU_INTENSIVE | WQ_PERCPU, 1);
+	if (!kintegrityd_wq)
+		panic("Failed to create kintegrityd\n");
+	return 0;
+}
+subsys_initcall(blk_integrity_auto_init);