sbp2.c

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/*
 * sbp2.c - SBP-2 protocol driver for IEEE-1394
 *
 * Copyright (C) 2000 James Goodwin, Filanet Corporation (www.filanet.com)
 * [e-mail] (JSG)
 *
 * Copyright (C) 2003 Ben Collins <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
 * Brief Description:
 *
 * This driver implements the Serial Bus Protocol 2 (SBP-2) over IEEE-1394
 * under Linux. The SBP-2 driver is implemented as an IEEE-1394 high-level
 * driver. It also registers as a SCSI lower-level driver in order to accept
 * SCSI commands for transport using SBP-2.
 *
 * You may access any attached SBP-2 storage devices as if they were SCSI
 * devices (e.g. mount /dev/sda1,  fdisk, mkfs, etc.).
 *
 * Current Issues:
 *
 *	- Error Handling: SCSI aborts and bus reset requests are handled somewhat
 *	  but the code needs additional debugging.
 */

#include <linux/blkdev.h>
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/gfp.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/stringify.h>
#include <linux/types.h>
#include <linux/wait.h>

#include <asm/byteorder.h>
#include <asm/errno.h>
#include <asm/param.h>
#include <asm/scatterlist.h>
#include <asm/system.h>
#include <asm/types.h>

#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA
#include <asm/io.h> /* for bus_to_virt */
#endif

#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 "csr1212.h"
#include "highlevel.h"
#include "hosts.h"
#include "ieee1394.h"
#include "ieee1394_core.h"
#include "ieee1394_hotplug.h"
#include "ieee1394_transactions.h"
#include "ieee1394_types.h"
#include "nodemgr.h"
#include "sbp2.h"

/*
 * Module load parameter definitions
 */

/*
 * Change max_speed on module load if you have a bad IEEE-1394
 * controller that has trouble running 2KB packets at 400mb.
 *
 * NOTE: On certain OHCI parts I have seen short packets on async transmit
 * (probably due to PCI latency/throughput issues with the part). You can
 * bump down the speed if you are running into problems.
 */
static int max_speed = IEEE1394_SPEED_MAX;
module_param(max_speed, int, 0644);
MODULE_PARM_DESC(max_speed, "Force max speed (3 = 800mb, 2 = 400mb, 1 = 200mb, 0 = 100mb)");

/*
 * Set serialize_io to 1 if you'd like only one scsi command sent
 * down to us at a time (debugging). This might be necessary for very
 * badly behaved sbp2 devices.
 *
 * TODO: Make this configurable per device.
 */
static int serialize_io = 1;
module_param(serialize_io, int, 0444);
MODULE_PARM_DESC(serialize_io, "Serialize I/O coming from scsi drivers (default = 1, faster = 0)");

/*
 * Bump up max_sectors if you'd like to support very large sized
 * transfers. Please note that some older sbp2 bridge chips are broken for
 * transfers greater or equal to 128KB.  Default is a value of 255
 * sectors, or just under 128KB (at 512 byte sector size). I can note that
 * the Oxsemi sbp2 chipsets have no problems supporting very large
 * transfer sizes.
 */
static int max_sectors = SBP2_MAX_SECTORS;
module_param(max_sectors, int, 0444);
MODULE_PARM_DESC(max_sectors, "Change max sectors per I/O supported (default = "
		 __stringify(SBP2_MAX_SECTORS) ")");

/*
 * Exclusive login to sbp2 device? In most cases, the sbp2 driver should
 * do an exclusive login, as it's generally unsafe to have two hosts
 * talking to a single sbp2 device at the same time (filesystem coherency,
 * etc.). If you're running an sbp2 device that supports multiple logins,
 * and you're either running read-only filesystems or some sort of special
 * filesystem supporting multiple hosts, e.g. OpenGFS, Oracle Cluster
 * File System, or Lustre, then set exclusive_login to zero.
 *
 * So far only bridges from Oxford Semiconductor are known to support
 * concurrent logins. Depending on firmware, four or two concurrent logins
 * are possible on OXFW911 and newer Oxsemi bridges.
 */
static int exclusive_login = 1;
module_param(exclusive_login, int, 0644);
MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device (default = 1)");

/*
 * If any of the following workarounds is required for your device to work,
 * please submit the kernel messages logged by sbp2 to the linux1394-devel
 * mailing list.
 *
 * - 128kB max transfer
 *   Limit transfer size. Necessary for some old bridges.
 *
 * - 36 byte inquiry
 *   When scsi_mod probes the device, let the inquiry command look like that
 *   from MS Windows.
 *
 * - skip mode page 8
 *   Suppress sending of mode_sense for mode page 8 if the device pretends to
 *   support the SCSI Primary Block commands instead of Reduced Block Commands.
 *
 * - fix capacity
 *   Tell sd_mod to correct the last sector number reported by read_capacity.
 *   Avoids access beyond actual disk limits on devices with an off-by-one bug.
 *   Don't use this with devices which don't have this bug.
 *
 * - override internal blacklist
 *   Instead of adding to the built-in blacklist, use only the workarounds
 *   specified in the module load parameter.
 *   Useful if a blacklist entry interfered with a non-broken device.
 */
static int sbp2_default_workarounds;
module_param_named(workarounds, sbp2_default_workarounds, int, 0644);
MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0"
	", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS)
	", 36 byte inquiry = "    __stringify(SBP2_WORKAROUND_INQUIRY_36)
	", skip mode page 8 = "   __stringify(SBP2_WORKAROUND_MODE_SENSE_8)
	", fix capacity = "       __stringify(SBP2_WORKAROUND_FIX_CAPACITY)
	", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE)
	", or a combination)");

/*
 * Export information about protocols/devices supported by this driver.
 */
static struct ieee1394_device_id sbp2_id_table[] = {
	{
	 .match_flags = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
	 .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY & 0xffffff,
	 .version = SBP2_SW_VERSION_ENTRY & 0xffffff},
	{}
};

MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);

/*
 * Debug levels, configured via kernel config, or enable here.
 */

#define CONFIG_IEEE1394_SBP2_DEBUG 0
/* #define CONFIG_IEEE1394_SBP2_DEBUG_ORBS */
/* #define CONFIG_IEEE1394_SBP2_DEBUG_DMA */
/* #define CONFIG_IEEE1394_SBP2_DEBUG 1 */
/* #define CONFIG_IEEE1394_SBP2_DEBUG 2 */
/* #define CONFIG_IEEE1394_SBP2_PACKET_DUMP */

#ifdef CONFIG_IEEE1394_SBP2_DEBUG_ORBS
#define SBP2_ORB_DEBUG(fmt, args...)	HPSB_ERR("sbp2(%s): "fmt, __FUNCTION__, ## args)
static u32 global_outstanding_command_orbs = 0;
#define outstanding_orb_incr global_outstanding_command_orbs++
#define outstanding_orb_decr global_outstanding_command_orbs--
#else
#define SBP2_ORB_DEBUG(fmt, args...)	do {} while (0)
#define outstanding_orb_incr		do {} while (0)
#define outstanding_orb_decr		do {} while (0)
#endif

#ifdef CONFIG_IEEE1394_SBP2_DEBUG_DMA
#define SBP2_DMA_ALLOC(fmt, args...) \
	HPSB_ERR("sbp2(%s)alloc(%d): "fmt, __FUNCTION__, \
		 ++global_outstanding_dmas, ## args)
#define SBP2_DMA_FREE(fmt, args...) \
	HPSB_ERR("sbp2(%s)free(%d): "fmt, __FUNCTION__, \
		 --global_outstanding_dmas, ## args)
static u32 global_outstanding_dmas = 0;
#else
#define SBP2_DMA_ALLOC(fmt, args...)	do {} while (0)
#define SBP2_DMA_FREE(fmt, args...)	do {} while (0)
#endif

#if CONFIG_IEEE1394_SBP2_DEBUG >= 2
#define SBP2_DEBUG(fmt, args...)	HPSB_ERR("sbp2: "fmt, ## args)
#define SBP2_INFO(fmt, args...)		HPSB_ERR("sbp2: "fmt, ## args)
#define SBP2_NOTICE(fmt, args...)	HPSB_ERR("sbp2: "fmt, ## args)
#define SBP2_WARN(fmt, args...)		HPSB_ERR("sbp2: "fmt, ## args)
#elif CONFIG_IEEE1394_SBP2_DEBUG == 1
#define SBP2_DEBUG(fmt, args...)	HPSB_DEBUG("sbp2: "fmt, ## args)
#define SBP2_INFO(fmt, args...)		HPSB_INFO("sbp2: "fmt, ## args)
#define SBP2_NOTICE(fmt, args...)	HPSB_NOTICE("sbp2: "fmt, ## args)
#define SBP2_WARN(fmt, args...)		HPSB_WARN("sbp2: "fmt, ## args)
#else
#define SBP2_DEBUG(fmt, args...)	do {} while (0)
#define SBP2_INFO(fmt, args...)		HPSB_INFO("sbp2: "fmt, ## args)
#define SBP2_NOTICE(fmt, args...)       HPSB_NOTICE("sbp2: "fmt, ## args)
#define SBP2_WARN(fmt, args...)         HPSB_WARN("sbp2: "fmt, ## args)
#endif

#define SBP2_ERR(fmt, args...)		HPSB_ERR("sbp2: "fmt, ## args)
#define SBP2_DEBUG_ENTER()		SBP2_DEBUG("%s", __FUNCTION__)

/*
 * Globals
 */

static void sbp2scsi_complete_all_commands(struct scsi_id_instance_data *scsi_id,
					   u32 status);

static void sbp2scsi_complete_command(struct scsi_id_instance_data *scsi_id,
				      u32 scsi_status, struct scsi_cmnd *SCpnt,
				      void (*done)(struct scsi_cmnd *));

static struct scsi_host_template scsi_driver_template;

static const u8 sbp2_speedto_max_payload[] = { 0x7, 0x8, 0x9, 0xA, 0xB, 0xC };

static void sbp2_host_reset(struct hpsb_host *host);

static int sbp2_probe(struct device *dev);
static int sbp2_remove(struct device *dev);
static int sbp2_update(struct unit_directory *ud);

static struct hpsb_highlevel sbp2_highlevel = {
	.name =		SBP2_DEVICE_NAME,
	.host_reset =	sbp2_host_reset,
};

static struct hpsb_address_ops sbp2_ops = {
	.write = sbp2_handle_status_write
};

#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA
static struct hpsb_address_ops sbp2_physdma_ops = {
	.read = sbp2_handle_physdma_read,
	.write = sbp2_handle_physdma_write,
};
#endif

static struct hpsb_protocol_driver sbp2_driver = {
	.name		= "SBP2 Driver",
	.id_table	= sbp2_id_table,
	.update		= sbp2_update,
	.driver		= {
		.name		= SBP2_DEVICE_NAME,
		.bus		= &ieee1394_bus_type,
		.probe		= sbp2_probe,
		.remove		= sbp2_remove,
	},
};

/*
 * List of devices with known bugs.
 *
 * The firmware_revision field, masked with 0xffff00, is the best indicator
 * for the type of bridge chip of a device.  It yields a few false positives
 * but this did not break correctly behaving devices so far.
 */
static const struct {
	u32 firmware_revision;
	u32 model_id;
	unsigned workarounds;
} sbp2_workarounds_table[] = {
	/* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
		.firmware_revision	= 0x002800,
		.model_id		= 0x001010,
		.workarounds		= SBP2_WORKAROUND_INQUIRY_36 |
					  SBP2_WORKAROUND_MODE_SENSE_8,
	},
	/* Initio bridges, actually only needed for some older ones */ {
		.firmware_revision	= 0x000200,
		.workarounds		= SBP2_WORKAROUND_INQUIRY_36,
	},
	/* Symbios bridge */ {
		.firmware_revision	= 0xa0b800,
		.workarounds		= SBP2_WORKAROUND_128K_MAX_TRANS,
	},
	/*
	 * Note about the following Apple iPod blacklist entries:
	 *
	 * There are iPods (2nd gen, 3rd gen) with model_id==0.  Since our
	 * matching logic treats 0 as a wildcard, we cannot match this ID
	 * without rewriting the matching routine.  Fortunately these iPods
	 * do not feature the read_capacity bug according to one report.
	 * Read_capacity behaviour as well as model_id could change due to
	 * Apple-supplied firmware updates though.
	 */
	/* iPod 4th generation */ {
		.firmware_revision	= 0x0a2700,
		.model_id		= 0x000021,
		.workarounds		= SBP2_WORKAROUND_FIX_CAPACITY,
	},
	/* iPod mini */ {
		.firmware_revision	= 0x0a2700,
		.model_id		= 0x000023,
		.workarounds		= SBP2_WORKAROUND_FIX_CAPACITY,
	},
	/* iPod Photo */ {
		.firmware_revision	= 0x0a2700,
		.model_id		= 0x00007e,
		.workarounds		= SBP2_WORKAROUND_FIX_CAPACITY,
	}
};

/**************************************
 * General utility functions
 **************************************/

#ifndef __BIG_ENDIAN
/*
 * Converts a buffer from be32 to cpu byte ordering. Length is in bytes.
 */
static inline void sbp2util_be32_to_cpu_buffer(void *buffer, int length)
{
	u32 *temp = buffer;

	for (length = (length >> 2); length--; )
		temp[length] = be32_to_cpu(temp[length]);

	return;
}

/*
 * Converts a buffer from cpu to be32 byte ordering. Length is in bytes.
 */
static inline void sbp2util_cpu_to_be32_buffer(void *buffer, int length)
{
	u32 *temp = buffer;

	for (length = (length >> 2); length--; )
		temp[length] = cpu_to_be32(temp[length]);

	return;
}
#else /* BIG_ENDIAN */
/* Why waste the cpu cycles? */
#define sbp2util_be32_to_cpu_buffer(x,y) do {} while (0)
#define sbp2util_cpu_to_be32_buffer(x,y) do {} while (0)
#endif

#ifdef CONFIG_IEEE1394_SBP2_PACKET_DUMP
/*
 * Debug packet dump routine. Length is in bytes.
 */
static void sbp2util_packet_dump(void *buffer, int length, char *dump_name,
				 u32 dump_phys_addr)
{
	int i;
	unsigned char *dump = buffer;

	if (!dump || !length || !dump_name)
		return;

	if (dump_phys_addr)
		printk("[%s, 0x%x]", dump_name, dump_phys_addr);
	else
		printk("[%s]", dump_name);
	for (i = 0; i < length; i++) {
		if (i > 0x3f) {
			printk("\n   ...");
			break;
		}
		if ((i & 0x3) == 0)
			printk("  ");
		if ((i & 0xf) == 0)
			printk("\n   ");
		printk("%02x ", (int)dump[i]);
	}
	printk("\n");

	return;
}
#else
#define sbp2util_packet_dump(w,x,y,z) do {} while (0)
#endif

static DECLARE_WAIT_QUEUE_HEAD(access_wq);

/*
 * Waits for completion of an SBP-2 access request.