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, 357 insertions, 0 deletions

diff --git a/block/blk-lib.c b/block/blk-lib.c
new file mode 100644
index 000000000..688bc67cb
--- /dev/null
+++ b/block/blk-lib.c
@@ -0,0 +1,357 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Functions related to generic helpers functions
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/bio.h>
+#include <linux/blkdev.h>
+#include <linux/scatterlist.h>
+
+#include "blk.h"
+
+static sector_t bio_discard_limit(struct block_device *bdev, sector_t sector)
+{
+	unsigned int discard_granularity = bdev_discard_granularity(bdev);
+	sector_t granularity_aligned_sector;
+
+	if (bdev_is_partition(bdev))
+		sector += bdev->bd_start_sect;
+
+	granularity_aligned_sector =
+		round_up(sector, discard_granularity >> SECTOR_SHIFT);
+
+	/*
+	 * Make sure subsequent bios start aligned to the discard granularity if
+	 * it needs to be split.
+	 */
+	if (granularity_aligned_sector != sector)
+		return granularity_aligned_sector - sector;
+
+	/*
+	 * Align the bio size to the discard granularity to make splitting the bio
+	 * at discard granularity boundaries easier in the driver if needed.
+	 */
+	return round_down(BIO_MAX_SIZE, discard_granularity) >> SECTOR_SHIFT;
+}
+
+struct bio *blk_alloc_discard_bio(struct block_device *bdev,
+		sector_t *sector, sector_t *nr_sects, gfp_t gfp_mask)
+{
+	sector_t bio_sects = min(*nr_sects, bio_discard_limit(bdev, *sector));
+	struct bio *bio;
+
+	if (!bio_sects)
+		return NULL;
+
+	bio = bio_alloc(bdev, 0, REQ_OP_DISCARD, gfp_mask);
+	if (!bio)
+		return NULL;
+	bio->bi_iter.bi_sector = *sector;
+	bio->bi_iter.bi_size = bio_sects << SECTOR_SHIFT;
+	*sector += bio_sects;
+	*nr_sects -= bio_sects;
+	/*
+	 * We can loop for a long time in here if someone does full device
+	 * discards (like mkfs).  Be nice and allow us to schedule out to avoid
+	 * softlocking if preempt is disabled.
+	 */
+	cond_resched();
+	return bio;
+}
+
+void __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
+		sector_t nr_sects, gfp_t gfp_mask, struct bio **biop)
+{
+	struct bio *bio;
+
+	while ((bio = blk_alloc_discard_bio(bdev, &sector, &nr_sects,
+			gfp_mask)))
+		*biop = bio_chain_and_submit(*biop, bio);
+}
+EXPORT_SYMBOL(__blkdev_issue_discard);
+
+/**
+ * blkdev_issue_discard - queue a discard
+ * @bdev:	blockdev to issue discard for
+ * @sector:	start sector
+ * @nr_sects:	number of sectors to discard
+ * @gfp_mask:	memory allocation flags (for bio_alloc)
+ *
+ * Description:
+ *    Issue a discard request for the sectors in question.
+ */
+int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
+		sector_t nr_sects, gfp_t gfp_mask)
+{
+	struct bio *bio = NULL;
+	struct blk_plug plug;
+	int ret = 0;
+
+	blk_start_plug(&plug);
+	__blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, &bio);
+	if (bio) {
+		ret = submit_bio_wait(bio);
+		if (ret == -EOPNOTSUPP)
+			ret = 0;
+		bio_put(bio);
+	}
+	blk_finish_plug(&plug);
+
+	return ret;
+}
+EXPORT_SYMBOL(blkdev_issue_discard);
+
+static sector_t bio_write_zeroes_limit(struct block_device *bdev)
+{
+	sector_t bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
+
+	return min(bdev_write_zeroes_sectors(bdev), BIO_MAX_SECTORS & ~bs_mask);
+}
+
+/*
+ * There is no reliable way for the SCSI subsystem to determine whether a
+ * device supports a WRITE SAME operation without actually performing a write
+ * to media. As a result, write_zeroes is enabled by default and will be
+ * disabled if a zeroing operation subsequently fails. This means that this
+ * queue limit is likely to change at runtime.
+ */
+static void __blkdev_issue_write_zeroes(struct block_device *bdev,
+		sector_t sector, sector_t nr_sects, gfp_t gfp_mask,
+		struct bio **biop, unsigned flags, sector_t limit)
+{
+
+	while (nr_sects) {
+		unsigned int len = min(nr_sects, limit);
+		struct bio *bio;
+
+		if ((flags & BLKDEV_ZERO_KILLABLE) &&
+		    fatal_signal_pending(current))
+			break;
+
+		bio = bio_alloc(bdev, 0, REQ_OP_WRITE_ZEROES, gfp_mask);
+		bio->bi_iter.bi_sector = sector;
+		if (flags & BLKDEV_ZERO_NOUNMAP)
+			bio->bi_opf |= REQ_NOUNMAP;
+
+		bio->bi_iter.bi_size = len << SECTOR_SHIFT;
+		*biop = bio_chain_and_submit(*biop, bio);
+
+		nr_sects -= len;
+		sector += len;
+		cond_resched();
+	}
+}
+
+static int blkdev_issue_write_zeroes(struct block_device *bdev, sector_t sector,
+		sector_t nr_sects, gfp_t gfp, unsigned flags)
+{
+	sector_t limit = bio_write_zeroes_limit(bdev);
+	struct bio *bio = NULL;
+	struct blk_plug plug;
+	int ret = 0;
+
+	blk_start_plug(&plug);
+	__blkdev_issue_write_zeroes(bdev, sector, nr_sects, gfp, &bio,
+			flags, limit);
+	if (bio) {
+		ret = bio_submit_or_kill(bio, flags);
+		bio_put(bio);
+	}
+	blk_finish_plug(&plug);
+
+	/*
+	 * For some devices there is no non-destructive way to verify whether
+	 * WRITE ZEROES is actually supported.  These will clear the capability
+	 * on an I/O error, in which case we'll turn any error into
+	 * "not supported" here.
+	 */
+	if (ret && !bdev_write_zeroes_sectors(bdev))
+		return -EOPNOTSUPP;
+	return ret;
+}
+
+/*
+ * Convert a number of 512B sectors to a number of pages.
+ * The result is limited to a number of pages that can fit into a BIO.
+ * Also make sure that the result is always at least 1 (page) for the cases
+ * where nr_sects is lower than the number of sectors in a page.
+ */
+static unsigned int __blkdev_sectors_to_bio_pages(sector_t nr_sects)
+{
+	sector_t pages = DIV_ROUND_UP_SECTOR_T(nr_sects, PAGE_SIZE / 512);
+
+	return min(pages, (sector_t)BIO_MAX_VECS);
+}
+
+static void __blkdev_issue_zero_pages(struct block_device *bdev,
+		sector_t sector, sector_t nr_sects, gfp_t gfp_mask,
+		struct bio **biop, unsigned int flags)
+{
+	struct folio *zero_folio = largest_zero_folio();
+
+	while (nr_sects) {
+		unsigned int nr_vecs = __blkdev_sectors_to_bio_pages(nr_sects);
+		struct bio *bio;
+
+		if ((flags & BLKDEV_ZERO_KILLABLE) &&
+		    fatal_signal_pending(current))
+			break;
+
+		bio = bio_alloc(bdev, nr_vecs, REQ_OP_WRITE, gfp_mask);
+		bio->bi_iter.bi_sector = sector;
+
+		do {
+			unsigned int len;
+
+			len = min_t(sector_t, folio_size(zero_folio),
+				    nr_sects << SECTOR_SHIFT);
+			if (!bio_add_folio(bio, zero_folio, len, 0))
+				break;
+			nr_sects -= len >> SECTOR_SHIFT;
+			sector += len >> SECTOR_SHIFT;
+		} while (nr_sects);
+
+		*biop = bio_chain_and_submit(*biop, bio);
+		cond_resched();
+	}
+}
+
+static int blkdev_issue_zero_pages(struct block_device *bdev, sector_t sector,
+		sector_t nr_sects, gfp_t gfp, unsigned flags)
+{
+	struct bio *bio = NULL;
+	struct blk_plug plug;
+	int ret = 0;
+
+	if (flags & BLKDEV_ZERO_NOFALLBACK)
+		return -EOPNOTSUPP;
+
+	blk_start_plug(&plug);
+	__blkdev_issue_zero_pages(bdev, sector, nr_sects, gfp, &bio, flags);
+	if (bio) {
+		ret = bio_submit_or_kill(bio, flags);
+		bio_put(bio);
+	}
+	blk_finish_plug(&plug);
+
+	return ret;
+}
+
+/**
+ * __blkdev_issue_zeroout - generate number of zero filed write bios
+ * @bdev:	blockdev to issue
+ * @sector:	start sector
+ * @nr_sects:	number of sectors to write
+ * @gfp_mask:	memory allocation flags (for bio_alloc)
+ * @biop:	pointer to anchor bio
+ * @flags:	controls detailed behavior
+ *
+ * Description:
+ *  Zero-fill a block range, either using hardware offload or by explicitly
+ *  writing zeroes to the device.
+ *
+ *  If a device is using logical block provisioning, the underlying space will
+ *  not be released if %flags contains BLKDEV_ZERO_NOUNMAP.
+ *
+ *  If %flags contains BLKDEV_ZERO_NOFALLBACK, the function will return
+ *  -EOPNOTSUPP if no explicit hardware offload for zeroing is provided.
+ */
+int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
+		sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
+		unsigned flags)
+{
+	sector_t limit = bio_write_zeroes_limit(bdev);
+
+	if (bdev_read_only(bdev))
+		return -EPERM;
+
+	if (limit) {
+		__blkdev_issue_write_zeroes(bdev, sector, nr_sects,
+				gfp_mask, biop, flags, limit);
+	} else {
+		if (flags & BLKDEV_ZERO_NOFALLBACK)
+			return -EOPNOTSUPP;
+		__blkdev_issue_zero_pages(bdev, sector, nr_sects, gfp_mask,
+				biop, flags);
+	}
+	return 0;
+}
+EXPORT_SYMBOL(__blkdev_issue_zeroout);
+
+/**
+ * blkdev_issue_zeroout - zero-fill a block range
+ * @bdev:	blockdev to write
+ * @sector:	start sector
+ * @nr_sects:	number of sectors to write
+ * @gfp_mask:	memory allocation flags (for bio_alloc)
+ * @flags:	controls detailed behavior
+ *
+ * Description:
+ *  Zero-fill a block range, either using hardware offload or by explicitly
+ *  writing zeroes to the device.  See __blkdev_issue_zeroout() for the
+ *  valid values for %flags.
+ */
+int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
+		sector_t nr_sects, gfp_t gfp_mask, unsigned flags)
+{
+	int ret;
+
+	if ((sector | nr_sects) & ((bdev_logical_block_size(bdev) >> 9) - 1))
+		return -EINVAL;
+	if (bdev_read_only(bdev))
+		return -EPERM;
+
+	if (bdev_write_zeroes_sectors(bdev)) {
+		ret = blkdev_issue_write_zeroes(bdev, sector, nr_sects,
+				gfp_mask, flags);
+		if (ret != -EOPNOTSUPP)
+			return ret;
+	}
+
+	return blkdev_issue_zero_pages(bdev, sector, nr_sects, gfp_mask, flags);
+}
+EXPORT_SYMBOL(blkdev_issue_zeroout);
+
+int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
+		sector_t nr_sects, gfp_t gfp)
+{
+	sector_t bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
+	unsigned int max_sectors = bdev_max_secure_erase_sectors(bdev);
+	struct bio *bio = NULL;
+	struct blk_plug plug;
+	int ret = 0;
+
+	/* make sure that "len << SECTOR_SHIFT" doesn't overflow */
+	if (max_sectors > BIO_MAX_SECTORS)
+		max_sectors = BIO_MAX_SECTORS;
+	max_sectors &= ~bs_mask;
+
+	if (max_sectors == 0)
+		return -EOPNOTSUPP;
+	if ((sector | nr_sects) & bs_mask)
+		return -EINVAL;
+	if (bdev_read_only(bdev))
+		return -EPERM;
+
+	blk_start_plug(&plug);
+	while (nr_sects) {
+		unsigned int len = min_t(sector_t, nr_sects, max_sectors);
+
+		bio = blk_next_bio(bio, bdev, 0, REQ_OP_SECURE_ERASE, gfp);
+		bio->bi_iter.bi_sector = sector;
+		bio->bi_iter.bi_size = len << SECTOR_SHIFT;
+
+		sector += len;
+		nr_sects -= len;
+		cond_resched();
+	}
+	if (bio) {
+		ret = submit_bio_wait(bio);
+		bio_put(bio);
+	}
+	blk_finish_plug(&plug);
+
+	return ret;
+}
+EXPORT_SYMBOL(blkdev_issue_secure_erase);