Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 438 insertions, 0 deletions

diff --git a/drivers/scsi/ps3rom.c b/drivers/scsi/ps3rom.c
new file mode 100644
index 000000000..a9c727d22
--- /dev/null
+++ b/drivers/scsi/ps3rom.c
@@ -0,0 +1,438 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PS3 BD/DVD/CD-ROM Storage Driver
+ *
+ * Copyright (C) 2007 Sony Computer Entertainment Inc.
+ * Copyright 2007 Sony Corp.
+ */
+
+#include <linux/cdrom.h>
+#include <linux/highmem.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_eh.h>
+
+#include <asm/lv1call.h>
+#include <asm/ps3stor.h>
+
+
+#define DEVICE_NAME			"ps3rom"
+
+#define BOUNCE_SIZE			(64*1024)
+
+#define PS3ROM_MAX_SECTORS		(BOUNCE_SIZE >> 9)
+
+
+struct ps3rom_private {
+	struct ps3_storage_device *dev;
+	struct scsi_cmnd *curr_cmd;
+};
+
+
+#define LV1_STORAGE_SEND_ATAPI_COMMAND	(1)
+
+struct lv1_atapi_cmnd_block {
+	u8	pkt[32];	/* packet command block           */
+	u32	pktlen;		/* should be 12 for ATAPI 8020    */
+	u32	blocks;
+	u32	block_size;
+	u32	proto;		/* transfer mode                  */
+	u32	in_out;		/* transfer direction             */
+	u64	buffer;		/* parameter except command block */
+	u32	arglen;		/* length above                   */
+};
+
+enum lv1_atapi_proto {
+	NON_DATA_PROTO     = 0,
+	PIO_DATA_IN_PROTO  = 1,
+	PIO_DATA_OUT_PROTO = 2,
+	DMA_PROTO = 3
+};
+
+enum lv1_atapi_in_out {
+	DIR_WRITE = 0,		/* memory -> device */
+	DIR_READ = 1		/* device -> memory */
+};
+
+
+static int ps3rom_sdev_configure(struct scsi_device *scsi_dev,
+				 struct queue_limits *lim)
+{
+	struct ps3rom_private *priv = shost_priv(scsi_dev->host);
+	struct ps3_storage_device *dev = priv->dev;
+
+	dev_dbg(&dev->sbd.core, "%s:%u: id %u, lun %llu, channel %u\n", __func__,
+		__LINE__, scsi_dev->id, scsi_dev->lun, scsi_dev->channel);
+
+	/*
+	 * ATAPI SFF8020 devices use MODE_SENSE_10,
+	 * so we can prohibit MODE_SENSE_6
+	 */
+	scsi_dev->use_10_for_ms = 1;
+
+	/* we don't support {READ,WRITE}_6 */
+	scsi_dev->use_10_for_rw = 1;
+
+	return 0;
+}
+
+static int ps3rom_atapi_request(struct ps3_storage_device *dev,
+				struct scsi_cmnd *cmd)
+{
+	struct lv1_atapi_cmnd_block atapi_cmnd;
+	unsigned char opcode = cmd->cmnd[0];
+	int res;
+	u64 lpar;
+
+	dev_dbg(&dev->sbd.core, "%s:%u: send ATAPI command 0x%02x\n", __func__,
+		__LINE__, opcode);
+
+	memset(&atapi_cmnd, 0, sizeof(struct lv1_atapi_cmnd_block));
+	memcpy(&atapi_cmnd.pkt, cmd->cmnd, 12);
+	atapi_cmnd.pktlen = 12;
+	atapi_cmnd.block_size = 1; /* transfer size is block_size * blocks */
+	atapi_cmnd.blocks = atapi_cmnd.arglen = scsi_bufflen(cmd);
+	atapi_cmnd.buffer = dev->bounce_lpar;
+
+	switch (cmd->sc_data_direction) {
+	case DMA_FROM_DEVICE:
+		if (scsi_bufflen(cmd) >= CD_FRAMESIZE)
+			atapi_cmnd.proto = DMA_PROTO;
+		else
+			atapi_cmnd.proto = PIO_DATA_IN_PROTO;
+		atapi_cmnd.in_out = DIR_READ;
+		break;
+
+	case DMA_TO_DEVICE:
+		if (scsi_bufflen(cmd) >= CD_FRAMESIZE)
+			atapi_cmnd.proto = DMA_PROTO;
+		else
+			atapi_cmnd.proto = PIO_DATA_OUT_PROTO;
+		atapi_cmnd.in_out = DIR_WRITE;
+		scsi_sg_copy_to_buffer(cmd, dev->bounce_buf, dev->bounce_size);
+		break;
+
+	default:
+		atapi_cmnd.proto = NON_DATA_PROTO;
+		break;
+	}
+
+	lpar = ps3_mm_phys_to_lpar(__pa(&atapi_cmnd));
+	res = lv1_storage_send_device_command(dev->sbd.dev_id,
+					      LV1_STORAGE_SEND_ATAPI_COMMAND,
+					      lpar, sizeof(atapi_cmnd),
+					      atapi_cmnd.buffer,
+					      atapi_cmnd.arglen, &dev->tag);
+	if (res == LV1_DENIED_BY_POLICY) {
+		dev_dbg(&dev->sbd.core,
+			"%s:%u: ATAPI command 0x%02x denied by policy\n",
+			__func__, __LINE__, opcode);
+		return DID_ERROR << 16;
+	}
+
+	if (res) {
+		dev_err(&dev->sbd.core,
+			"%s:%u: ATAPI command 0x%02x failed %d\n", __func__,
+			__LINE__, opcode, res);
+		return DID_ERROR << 16;
+	}
+
+	return 0;
+}
+
+static inline unsigned int srb10_lba(const struct scsi_cmnd *cmd)
+{
+	return cmd->cmnd[2] << 24 | cmd->cmnd[3] << 16 | cmd->cmnd[4] << 8 |
+	       cmd->cmnd[5];
+}
+
+static inline unsigned int srb10_len(const struct scsi_cmnd *cmd)
+{
+	return cmd->cmnd[7] << 8 | cmd->cmnd[8];
+}
+
+static int ps3rom_read_request(struct ps3_storage_device *dev,
+			       struct scsi_cmnd *cmd, u32 start_sector,
+			       u32 sectors)
+{
+	int res;
+
+	dev_dbg(&dev->sbd.core, "%s:%u: read %u sectors starting at %u\n",
+		__func__, __LINE__, sectors, start_sector);
+
+	res = lv1_storage_read(dev->sbd.dev_id,
+			       dev->regions[dev->region_idx].id, start_sector,
+			       sectors, 0, dev->bounce_lpar, &dev->tag);
+	if (res) {
+		dev_err(&dev->sbd.core, "%s:%u: read failed %d\n", __func__,
+			__LINE__, res);
+		return DID_ERROR << 16;
+	}
+
+	return 0;
+}
+
+static int ps3rom_write_request(struct ps3_storage_device *dev,
+				struct scsi_cmnd *cmd, u32 start_sector,
+				u32 sectors)
+{
+	int res;
+
+	dev_dbg(&dev->sbd.core, "%s:%u: write %u sectors starting at %u\n",
+		__func__, __LINE__, sectors, start_sector);
+
+	scsi_sg_copy_to_buffer(cmd, dev->bounce_buf, dev->bounce_size);
+
+	res = lv1_storage_write(dev->sbd.dev_id,
+				dev->regions[dev->region_idx].id, start_sector,
+				sectors, 0, dev->bounce_lpar, &dev->tag);
+	if (res) {
+		dev_err(&dev->sbd.core, "%s:%u: write failed %d\n", __func__,
+			__LINE__, res);
+		return DID_ERROR << 16;
+	}
+
+	return 0;
+}
+
+static enum scsi_qc_status ps3rom_queuecommand_lck(struct scsi_cmnd *cmd)
+{
+	struct ps3rom_private *priv = shost_priv(cmd->device->host);
+	struct ps3_storage_device *dev = priv->dev;
+	unsigned char opcode;
+	int res;
+
+	priv->curr_cmd = cmd;
+
+	opcode = cmd->cmnd[0];
+	/*
+	 * While we can submit READ/WRITE SCSI commands as ATAPI commands,
+	 * it's recommended for various reasons (performance, error handling,
+	 * ...) to use lv1_storage_{read,write}() instead
+	 */
+	switch (opcode) {
+	case READ_10:
+		res = ps3rom_read_request(dev, cmd, srb10_lba(cmd),
+					  srb10_len(cmd));
+		break;
+
+	case WRITE_10:
+		res = ps3rom_write_request(dev, cmd, srb10_lba(cmd),
+					   srb10_len(cmd));
+		break;
+
+	default:
+		res = ps3rom_atapi_request(dev, cmd);
+		break;
+	}
+
+	if (res) {
+		scsi_build_sense(cmd, 0, ILLEGAL_REQUEST, 0, 0);
+		cmd->result = res;
+		priv->curr_cmd = NULL;
+		scsi_done(cmd);
+	}
+
+	return 0;
+}
+
+static DEF_SCSI_QCMD(ps3rom_queuecommand)
+
+static int decode_lv1_status(u64 status, unsigned char *sense_key,
+			     unsigned char *asc, unsigned char *ascq)
+{
+	if (((status >> 24) & 0xff) != SAM_STAT_CHECK_CONDITION)
+		return -1;
+
+	*sense_key = (status >> 16) & 0xff;
+	*asc       = (status >>  8) & 0xff;
+	*ascq      =  status        & 0xff;
+	return 0;
+}
+
+static irqreturn_t ps3rom_interrupt(int irq, void *data)
+{
+	struct ps3_storage_device *dev = data;
+	struct Scsi_Host *host;
+	struct ps3rom_private *priv;
+	struct scsi_cmnd *cmd;
+	int res;
+	u64 tag, status;
+	unsigned char sense_key, asc, ascq;
+
+	res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
+	/*
+	 * status = -1 may mean that ATAPI transport completed OK, but
+	 * ATAPI command itself resulted CHECK CONDITION
+	 * so, upper layer should issue REQUEST_SENSE to check the sense data
+	 */
+
+	if (tag != dev->tag)
+		dev_err(&dev->sbd.core,
+			"%s:%u: tag mismatch, got %llx, expected %llx\n",
+			__func__, __LINE__, tag, dev->tag);
+
+	if (res) {
+		dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
+			__func__, __LINE__, res, status);
+		return IRQ_HANDLED;
+	}
+
+	host = ps3_system_bus_get_drvdata(&dev->sbd);
+	priv = shost_priv(host);
+	cmd = priv->curr_cmd;
+
+	if (!status) {
+		/* OK, completed */
+		if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
+			int len;
+
+			len = scsi_sg_copy_from_buffer(cmd,
+						       dev->bounce_buf,
+						       dev->bounce_size);
+
+			scsi_set_resid(cmd, scsi_bufflen(cmd) - len);
+		}
+		cmd->result = DID_OK << 16;
+		goto done;
+	}
+
+	if (cmd->cmnd[0] == REQUEST_SENSE) {
+		/* SCSI spec says request sense should never get error */
+		dev_err(&dev->sbd.core, "%s:%u: end error without autosense\n",
+			__func__, __LINE__);
+		cmd->result = DID_ERROR << 16 | SAM_STAT_CHECK_CONDITION;
+		goto done;
+	}
+
+	if (decode_lv1_status(status, &sense_key, &asc, &ascq)) {
+		cmd->result = DID_ERROR << 16;
+		goto done;
+	}
+
+	scsi_build_sense(cmd, 0, sense_key, asc, ascq);
+
+done:
+	priv->curr_cmd = NULL;
+	scsi_done(cmd);
+	return IRQ_HANDLED;
+}
+
+static const struct scsi_host_template ps3rom_host_template = {
+	.name =			DEVICE_NAME,
+	.sdev_configure =	ps3rom_sdev_configure,
+	.queuecommand =		ps3rom_queuecommand,
+	.can_queue =		1,
+	.this_id =		7,
+	.sg_tablesize =		SG_ALL,
+	.emulated =             1,		/* only sg driver uses this */
+	.max_sectors =		PS3ROM_MAX_SECTORS,
+	.module =		THIS_MODULE,
+};
+
+
+static int ps3rom_probe(struct ps3_system_bus_device *_dev)
+{
+	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
+	int error;
+	struct Scsi_Host *host;
+	struct ps3rom_private *priv;
+
+	if (dev->blk_size != CD_FRAMESIZE) {
+		dev_err(&dev->sbd.core,
+			"%s:%u: cannot handle block size %llu\n", __func__,
+			__LINE__, dev->blk_size);
+		return -EINVAL;
+	}
+
+	dev->bounce_size = BOUNCE_SIZE;
+	dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
+	if (!dev->bounce_buf)
+		return -ENOMEM;
+
+	error = ps3stor_setup(dev, ps3rom_interrupt);
+	if (error)
+		goto fail_free_bounce;
+
+	host = scsi_host_alloc(&ps3rom_host_template,
+			       sizeof(struct ps3rom_private));
+	if (!host) {
+		dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed\n",
+			__func__, __LINE__);
+		error = -ENOMEM;
+		goto fail_teardown;
+	}
+
+	priv = shost_priv(host);
+	ps3_system_bus_set_drvdata(&dev->sbd, host);
+	priv->dev = dev;
+
+	/* One device/LUN per SCSI bus */
+	host->max_id = 1;
+	host->max_lun = 1;
+
+	error = scsi_add_host(host, &dev->sbd.core);
+	if (error) {
+		dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed %d\n",
+			__func__, __LINE__, error);
+		error = -ENODEV;
+		goto fail_host_put;
+	}
+
+	scsi_scan_host(host);
+	return 0;
+
+fail_host_put:
+	scsi_host_put(host);
+	ps3_system_bus_set_drvdata(&dev->sbd, NULL);
+fail_teardown:
+	ps3stor_teardown(dev);
+fail_free_bounce:
+	kfree(dev->bounce_buf);
+	return error;
+}
+
+static void ps3rom_remove(struct ps3_system_bus_device *_dev)
+{
+	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
+	struct Scsi_Host *host = ps3_system_bus_get_drvdata(&dev->sbd);
+
+	scsi_remove_host(host);
+	ps3stor_teardown(dev);
+	scsi_host_put(host);
+	ps3_system_bus_set_drvdata(&dev->sbd, NULL);
+	kfree(dev->bounce_buf);
+}
+
+static struct ps3_system_bus_driver ps3rom = {
+	.match_id	= PS3_MATCH_ID_STOR_ROM,
+	.core.name	= DEVICE_NAME,
+	.core.owner	= THIS_MODULE,
+	.probe		= ps3rom_probe,
+	.remove		= ps3rom_remove
+};
+
+
+static int __init ps3rom_init(void)
+{
+	return ps3_system_bus_driver_register(&ps3rom);
+}
+
+static void __exit ps3rom_exit(void)
+{
+	ps3_system_bus_driver_unregister(&ps3rom);
+}
+
+module_init(ps3rom_init);
+module_exit(ps3rom_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("PS3 BD/DVD/CD-ROM Storage Driver");
+MODULE_AUTHOR("Sony Corporation");
+MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_ROM);