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linux-next/drivers/scsi/hpsa.h
Matt Gates e1f7de0cdd [SCSI] hpsa: add support for 'fastpath' i/o 
For certain i/o's to certain devices (unmasked physical disks) we
can bypass the RAID stack firmware and do the i/o to the device
directly and it will be faster.

Signed-off-by: Matt Gates <matthew.gates@hp.com>
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2014-03-15 10:19:02 -07:00

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/*
* Disk Array driver for HP Smart Array SAS controllers
* Copyright 2000, 2009 Hewlett-Packard Development Company, L.P.
*
* 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; version 2 of the License.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Questions/Comments/Bugfixes to iss_storagedev@hp.com
*
*/
#ifndef HPSA_H
#define HPSA_H
#include <scsi/scsicam.h>
#define IO_OK 0
#define IO_ERROR 1
struct ctlr_info;
struct access_method {
void (*submit_command)(struct ctlr_info *h,
struct CommandList *c);
void (*set_intr_mask)(struct ctlr_info *h, unsigned long val);
unsigned long (*fifo_full)(struct ctlr_info *h);
bool (*intr_pending)(struct ctlr_info *h);
unsigned long (*command_completed)(struct ctlr_info *h, u8 q);
};
struct hpsa_scsi_dev_t {
int devtype;
int bus, target, lun; /* as presented to the OS */
unsigned char scsi3addr[8]; /* as presented to the HW */
#define RAID_CTLR_LUNID "\0\0\0\0\0\0\0\0"
unsigned char device_id[16]; /* from inquiry pg. 0x83 */
unsigned char vendor[8]; /* bytes 8-15 of inquiry data */
unsigned char model[16]; /* bytes 16-31 of inquiry data */
unsigned char raid_level; /* from inquiry page 0xC1 */
u32 ioaccel_handle;
};
struct reply_pool {
u64 *head;
size_t size;
u8 wraparound;
u32 current_entry;
};
struct ctlr_info {
int ctlr;
char devname[8];
char *product_name;
struct pci_dev *pdev;
u32 board_id;
void __iomem *vaddr;
unsigned long paddr;
int nr_cmds; /* Number of commands allowed on this controller */
struct CfgTable __iomem *cfgtable;
int interrupts_enabled;
int major;
int max_commands;
int commands_outstanding;
int max_outstanding; /* Debug */
int usage_count; /* number of opens all all minor devices */
# define PERF_MODE_INT 0
# define DOORBELL_INT 1
# define SIMPLE_MODE_INT 2
# define MEMQ_MODE_INT 3
unsigned int intr[MAX_REPLY_QUEUES];
unsigned int msix_vector;
unsigned int msi_vector;
int intr_mode; /* either PERF_MODE_INT or SIMPLE_MODE_INT */
struct access_method access;
/* queue and queue Info */
struct list_head reqQ;
struct list_head cmpQ;
unsigned int Qdepth;
unsigned int maxSG;
spinlock_t lock;
int maxsgentries;
u8 max_cmd_sg_entries;
int chainsize;
struct SGDescriptor **cmd_sg_list;
/* pointers to command and error info pool */
struct CommandList *cmd_pool;
dma_addr_t cmd_pool_dhandle;
struct io_accel1_cmd *ioaccel_cmd_pool;
dma_addr_t ioaccel_cmd_pool_dhandle;
struct ErrorInfo *errinfo_pool;
dma_addr_t errinfo_pool_dhandle;
unsigned long *cmd_pool_bits;
int scan_finished;
spinlock_t scan_lock;
wait_queue_head_t scan_wait_queue;
struct Scsi_Host *scsi_host;
spinlock_t devlock; /* to protect hba[ctlr]->dev[]; */
int ndevices; /* number of used elements in .dev[] array. */
struct hpsa_scsi_dev_t *dev[HPSA_MAX_DEVICES];
/*
* Performant mode tables.
*/
u32 trans_support;
u32 trans_offset;
struct TransTable_struct *transtable;
unsigned long transMethod;
/* cap concurrent passthrus at some reasonable maximum */
#define HPSA_MAX_CONCURRENT_PASSTHRUS (20)
spinlock_t passthru_count_lock; /* protects passthru_count */
int passthru_count;
/*
* Performant mode completion buffers
*/
u64 *reply_pool;
size_t reply_pool_size;
struct reply_pool reply_queue[MAX_REPLY_QUEUES];
u8 nreply_queues;
dma_addr_t reply_pool_dhandle;
u32 *blockFetchTable;
u32 *ioaccel1_blockFetchTable;
unsigned char *hba_inquiry_data;
u64 last_intr_timestamp;
u32 last_heartbeat;
u64 last_heartbeat_timestamp;
u32 heartbeat_sample_interval;
atomic_t firmware_flash_in_progress;
u32 lockup_detected;
struct delayed_work monitor_ctlr_work;
int remove_in_progress;
u32 fifo_recently_full;
/* Address of h->q[x] is passed to intr handler to know which queue */
u8 q[MAX_REPLY_QUEUES];
u32 TMFSupportFlags; /* cache what task mgmt funcs are supported. */
#define HPSATMF_BITS_SUPPORTED (1 << 0)
#define HPSATMF_PHYS_LUN_RESET (1 << 1)
#define HPSATMF_PHYS_NEX_RESET (1 << 2)
#define HPSATMF_PHYS_TASK_ABORT (1 << 3)
#define HPSATMF_PHYS_TSET_ABORT (1 << 4)
#define HPSATMF_PHYS_CLEAR_ACA (1 << 5)
#define HPSATMF_PHYS_CLEAR_TSET (1 << 6)
#define HPSATMF_PHYS_QRY_TASK (1 << 7)
#define HPSATMF_PHYS_QRY_TSET (1 << 8)
#define HPSATMF_PHYS_QRY_ASYNC (1 << 9)
#define HPSATMF_MASK_SUPPORTED (1 << 16)
#define HPSATMF_LOG_LUN_RESET (1 << 17)
#define HPSATMF_LOG_NEX_RESET (1 << 18)
#define HPSATMF_LOG_TASK_ABORT (1 << 19)
#define HPSATMF_LOG_TSET_ABORT (1 << 20)
#define HPSATMF_LOG_CLEAR_ACA (1 << 21)
#define HPSATMF_LOG_CLEAR_TSET (1 << 22)
#define HPSATMF_LOG_QRY_TASK (1 << 23)
#define HPSATMF_LOG_QRY_TSET (1 << 24)
#define HPSATMF_LOG_QRY_ASYNC (1 << 25)
};
#define HPSA_ABORT_MSG 0
#define HPSA_DEVICE_RESET_MSG 1
#define HPSA_RESET_TYPE_CONTROLLER 0x00
#define HPSA_RESET_TYPE_BUS 0x01
#define HPSA_RESET_TYPE_TARGET 0x03
#define HPSA_RESET_TYPE_LUN 0x04
#define HPSA_MSG_SEND_RETRY_LIMIT 10
#define HPSA_MSG_SEND_RETRY_INTERVAL_MSECS (10000)
/* Maximum time in seconds driver will wait for command completions
* when polling before giving up.
*/
#define HPSA_MAX_POLL_TIME_SECS (20)
/* During SCSI error recovery, HPSA_TUR_RETRY_LIMIT defines
* how many times to retry TEST UNIT READY on a device
* while waiting for it to become ready before giving up.
* HPSA_MAX_WAIT_INTERVAL_SECS is the max wait interval
* between sending TURs while waiting for a device
* to become ready.
*/
#define HPSA_TUR_RETRY_LIMIT (20)
#define HPSA_MAX_WAIT_INTERVAL_SECS (30)
/* HPSA_BOARD_READY_WAIT_SECS is how long to wait for a board
* to become ready, in seconds, before giving up on it.
* HPSA_BOARD_READY_POLL_INTERVAL_MSECS * is how long to wait
* between polling the board to see if it is ready, in
* milliseconds. HPSA_BOARD_READY_POLL_INTERVAL and
* HPSA_BOARD_READY_ITERATIONS are derived from those.
*/
#define HPSA_BOARD_READY_WAIT_SECS (120)
#define HPSA_BOARD_NOT_READY_WAIT_SECS (100)
#define HPSA_BOARD_READY_POLL_INTERVAL_MSECS (100)
#define HPSA_BOARD_READY_POLL_INTERVAL \
((HPSA_BOARD_READY_POLL_INTERVAL_MSECS * HZ) / 1000)
#define HPSA_BOARD_READY_ITERATIONS \
((HPSA_BOARD_READY_WAIT_SECS * 1000) / \
HPSA_BOARD_READY_POLL_INTERVAL_MSECS)
#define HPSA_BOARD_NOT_READY_ITERATIONS \
((HPSA_BOARD_NOT_READY_WAIT_SECS * 1000) / \
HPSA_BOARD_READY_POLL_INTERVAL_MSECS)
#define HPSA_POST_RESET_PAUSE_MSECS (3000)
#define HPSA_POST_RESET_NOOP_RETRIES (12)
/* Defining the diffent access_menthods */
/*
* Memory mapped FIFO interface (SMART 53xx cards)
*/
#define SA5_DOORBELL 0x20
#define SA5_REQUEST_PORT_OFFSET 0x40
#define SA5_REPLY_INTR_MASK_OFFSET 0x34
#define SA5_REPLY_PORT_OFFSET 0x44
#define SA5_INTR_STATUS 0x30
#define SA5_SCRATCHPAD_OFFSET 0xB0
#define SA5_CTCFG_OFFSET 0xB4
#define SA5_CTMEM_OFFSET 0xB8
#define SA5_INTR_OFF 0x08
#define SA5B_INTR_OFF 0x04
#define SA5_INTR_PENDING 0x08
#define SA5B_INTR_PENDING 0x04
#define FIFO_EMPTY 0xffffffff
#define HPSA_FIRMWARE_READY 0xffff0000 /* value in scratchpad register */
#define HPSA_ERROR_BIT 0x02
/* Performant mode flags */
#define SA5_PERF_INTR_PENDING 0x04
#define SA5_PERF_INTR_OFF 0x05
#define SA5_OUTDB_STATUS_PERF_BIT 0x01
#define SA5_OUTDB_CLEAR_PERF_BIT 0x01
#define SA5_OUTDB_CLEAR 0xA0
#define SA5_OUTDB_CLEAR_PERF_BIT 0x01
#define SA5_OUTDB_STATUS 0x9C
#define HPSA_INTR_ON 1
#define HPSA_INTR_OFF 0
/*
Send the command to the hardware
*/
static void SA5_submit_command(struct ctlr_info *h,
struct CommandList *c)
{
dev_dbg(&h->pdev->dev, "Sending %x, tag = %x\n", c->busaddr,
c->Header.Tag.lower);
writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
(void) readl(h->vaddr + SA5_SCRATCHPAD_OFFSET);
}
/*
* This card is the opposite of the other cards.
* 0 turns interrupts on...
* 0x08 turns them off...
*/
static void SA5_intr_mask(struct ctlr_info *h, unsigned long val)
{
if (val) { /* Turn interrupts on */
h->interrupts_enabled = 1;
writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
} else { /* Turn them off */
h->interrupts_enabled = 0;
writel(SA5_INTR_OFF,
h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
}
}
static void SA5_performant_intr_mask(struct ctlr_info *h, unsigned long val)
{
if (val) { /* turn on interrupts */
h->interrupts_enabled = 1;
writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
} else {
h->interrupts_enabled = 0;
writel(SA5_PERF_INTR_OFF,
h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
}
}
static unsigned long SA5_performant_completed(struct ctlr_info *h, u8 q)
{
struct reply_pool *rq = &h->reply_queue[q];
unsigned long flags, register_value = FIFO_EMPTY;
/* msi auto clears the interrupt pending bit. */
if (!(h->msi_vector || h->msix_vector)) {
/* flush the controller write of the reply queue by reading
* outbound doorbell status register.
*/
register_value = readl(h->vaddr + SA5_OUTDB_STATUS);
writel(SA5_OUTDB_CLEAR_PERF_BIT, h->vaddr + SA5_OUTDB_CLEAR);
/* Do a read in order to flush the write to the controller
* (as per spec.)
*/
register_value = readl(h->vaddr + SA5_OUTDB_STATUS);
}
if ((rq->head[rq->current_entry] & 1) == rq->wraparound) {
register_value = rq->head[rq->current_entry];
rq->current_entry++;
spin_lock_irqsave(&h->lock, flags);
h->commands_outstanding--;
spin_unlock_irqrestore(&h->lock, flags);
} else {
register_value = FIFO_EMPTY;
}
/* Check for wraparound */
if (rq->current_entry == h->max_commands) {
rq->current_entry = 0;
rq->wraparound ^= 1;
}
return register_value;
}
/*
* Returns true if fifo is full.
*
*/
static unsigned long SA5_fifo_full(struct ctlr_info *h)
{
if (h->commands_outstanding >= h->max_commands)
return 1;
else
return 0;
}
/*
* returns value read from hardware.
* returns FIFO_EMPTY if there is nothing to read
*/
static unsigned long SA5_completed(struct ctlr_info *h,
__attribute__((unused)) u8 q)
{
unsigned long register_value
= readl(h->vaddr + SA5_REPLY_PORT_OFFSET);
unsigned long flags;
if (register_value != FIFO_EMPTY) {
spin_lock_irqsave(&h->lock, flags);
h->commands_outstanding--;
spin_unlock_irqrestore(&h->lock, flags);
}
#ifdef HPSA_DEBUG
if (register_value != FIFO_EMPTY)
dev_dbg(&h->pdev->dev, "Read %lx back from board\n",
register_value);
else
dev_dbg(&h->pdev->dev, "FIFO Empty read\n");
#endif
return register_value;
}
/*
* Returns true if an interrupt is pending..
*/
static bool SA5_intr_pending(struct ctlr_info *h)
{
unsigned long register_value =
readl(h->vaddr + SA5_INTR_STATUS);
dev_dbg(&h->pdev->dev, "intr_pending %lx\n", register_value);
return register_value & SA5_INTR_PENDING;
}
static bool SA5_performant_intr_pending(struct ctlr_info *h)
{
unsigned long register_value = readl(h->vaddr + SA5_INTR_STATUS);
if (!register_value)
return false;
if (h->msi_vector || h->msix_vector)
return true;
/* Read outbound doorbell to flush */
register_value = readl(h->vaddr + SA5_OUTDB_STATUS);
return register_value & SA5_OUTDB_STATUS_PERF_BIT;
}
#define SA5_IOACCEL_MODE1_INTR_STATUS_CMP_BIT 0x100
static bool SA5_ioaccel_mode1_intr_pending(struct ctlr_info *h)
{
unsigned long register_value = readl(h->vaddr + SA5_INTR_STATUS);
return (register_value & SA5_IOACCEL_MODE1_INTR_STATUS_CMP_BIT) ?
true : false;
}
#define IOACCEL_MODE1_REPLY_QUEUE_INDEX 0x1A0
#define IOACCEL_MODE1_PRODUCER_INDEX 0x1B8
#define IOACCEL_MODE1_CONSUMER_INDEX 0x1BC
#define IOACCEL_MODE1_REPLY_UNUSED 0xFFFFFFFFFFFFFFFFULL
static unsigned long SA5_ioaccel_mode1_completed(struct ctlr_info *h,
u8 q)
{
u64 register_value;
struct reply_pool *rq = &h->reply_queue[q];
unsigned long flags;
BUG_ON(q >= h->nreply_queues);
register_value = rq->head[rq->current_entry];
if (register_value != IOACCEL_MODE1_REPLY_UNUSED) {
rq->head[rq->current_entry] = IOACCEL_MODE1_REPLY_UNUSED;
if (++rq->current_entry == rq->size)
rq->current_entry = 0;
spin_lock_irqsave(&h->lock, flags);
h->commands_outstanding--;
spin_unlock_irqrestore(&h->lock, flags);
} else {
writel((q << 24) | rq->current_entry,
h->vaddr + IOACCEL_MODE1_CONSUMER_INDEX);
}
return (unsigned long) register_value;
}
static struct access_method SA5_access = {
SA5_submit_command,
SA5_intr_mask,
SA5_fifo_full,
SA5_intr_pending,
SA5_completed,
};
static struct access_method SA5_ioaccel_mode1_access = {
SA5_submit_command,
SA5_performant_intr_mask,
SA5_fifo_full,
SA5_ioaccel_mode1_intr_pending,
SA5_ioaccel_mode1_completed,
};
static struct access_method SA5_performant_access = {
SA5_submit_command,
SA5_performant_intr_mask,
SA5_fifo_full,
SA5_performant_intr_pending,
SA5_performant_completed,
};
struct board_type {
u32 board_id;
char *product_name;
struct access_method *access;
};
#endif /* HPSA_H */
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