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linux/drivers/block/rsxx/core.c
Philip J Kelleher 1b21f5b2ad rsxx: Moving pci_map_page to prevent overflow. 
The pci_map_page function has been moved into our
issued workqueue to prevent an us running out of
mappable addresses on non-HWWD PCIe x8 slots. The
maximum amount that can possible be mapped at one
time now is: 255 dmas X 4 dma channels X 4096 Bytes.

Signed-off-by: Philip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-11-08 09:10:28 -07:00

1194 lines
29 KiB
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/*
* Filename: core.c
*
*
* Authors: Joshua Morris <josh.h.morris@us.ibm.com>
* Philip Kelleher <pjk1939@linux.vnet.ibm.com>
*
* (C) Copyright 2013 IBM Corporation
*
* 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
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/genhd.h>
#include <linux/idr.h>
#include "rsxx_priv.h"
#include "rsxx_cfg.h"
#define NO_LEGACY 0
#define SYNC_START_TIMEOUT (10 * 60) /* 10 minutes */
MODULE_DESCRIPTION("IBM Flash Adapter 900GB Full Height Device Driver");
MODULE_AUTHOR("Joshua Morris/Philip Kelleher, IBM");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRIVER_VERSION);
static unsigned int force_legacy = NO_LEGACY;
module_param(force_legacy, uint, 0444);
MODULE_PARM_DESC(force_legacy, "Force the use of legacy type PCI interrupts");
static unsigned int sync_start = 1;
module_param(sync_start, uint, 0444);
MODULE_PARM_DESC(sync_start, "On by Default: Driver load will not complete "
"until the card startup has completed.");
static DEFINE_IDA(rsxx_disk_ida);
static DEFINE_SPINLOCK(rsxx_ida_lock);
/* --------------------Debugfs Setup ------------------- */
struct rsxx_cram {
u32 f_pos;
u32 offset;
void *i_private;
};
static int rsxx_attr_pci_regs_show(struct seq_file *m, void *p)
{
struct rsxx_cardinfo *card = m->private;
seq_printf(m, "HWID 0x%08x\n",
ioread32(card->regmap + HWID));
seq_printf(m, "SCRATCH 0x%08x\n",
ioread32(card->regmap + SCRATCH));
seq_printf(m, "IER 0x%08x\n",
ioread32(card->regmap + IER));
seq_printf(m, "IPR 0x%08x\n",
ioread32(card->regmap + IPR));
seq_printf(m, "CREG_CMD 0x%08x\n",
ioread32(card->regmap + CREG_CMD));
seq_printf(m, "CREG_ADD 0x%08x\n",
ioread32(card->regmap + CREG_ADD));
seq_printf(m, "CREG_CNT 0x%08x\n",
ioread32(card->regmap + CREG_CNT));
seq_printf(m, "CREG_STAT 0x%08x\n",
ioread32(card->regmap + CREG_STAT));
seq_printf(m, "CREG_DATA0 0x%08x\n",
ioread32(card->regmap + CREG_DATA0));
seq_printf(m, "CREG_DATA1 0x%08x\n",
ioread32(card->regmap + CREG_DATA1));
seq_printf(m, "CREG_DATA2 0x%08x\n",
ioread32(card->regmap + CREG_DATA2));
seq_printf(m, "CREG_DATA3 0x%08x\n",
ioread32(card->regmap + CREG_DATA3));
seq_printf(m, "CREG_DATA4 0x%08x\n",
ioread32(card->regmap + CREG_DATA4));
seq_printf(m, "CREG_DATA5 0x%08x\n",
ioread32(card->regmap + CREG_DATA5));
seq_printf(m, "CREG_DATA6 0x%08x\n",
ioread32(card->regmap + CREG_DATA6));
seq_printf(m, "CREG_DATA7 0x%08x\n",
ioread32(card->regmap + CREG_DATA7));
seq_printf(m, "INTR_COAL 0x%08x\n",
ioread32(card->regmap + INTR_COAL));
seq_printf(m, "HW_ERROR 0x%08x\n",
ioread32(card->regmap + HW_ERROR));
seq_printf(m, "DEBUG0 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG0));
seq_printf(m, "DEBUG1 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG1));
seq_printf(m, "DEBUG2 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG2));
seq_printf(m, "DEBUG3 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG3));
seq_printf(m, "DEBUG4 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG4));
seq_printf(m, "DEBUG5 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG5));
seq_printf(m, "DEBUG6 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG6));
seq_printf(m, "DEBUG7 0x%08x\n",
ioread32(card->regmap + PCI_DEBUG7));
seq_printf(m, "RECONFIG 0x%08x\n",
ioread32(card->regmap + PCI_RECONFIG));
return 0;
}
static int rsxx_attr_stats_show(struct seq_file *m, void *p)
{
struct rsxx_cardinfo *card = m->private;
int i;
for (i = 0; i < card->n_targets; i++) {
seq_printf(m, "Ctrl %d CRC Errors = %d\n",
i, card->ctrl[i].stats.crc_errors);
seq_printf(m, "Ctrl %d Hard Errors = %d\n",
i, card->ctrl[i].stats.hard_errors);
seq_printf(m, "Ctrl %d Soft Errors = %d\n",
i, card->ctrl[i].stats.soft_errors);
seq_printf(m, "Ctrl %d Writes Issued = %d\n",
i, card->ctrl[i].stats.writes_issued);
seq_printf(m, "Ctrl %d Writes Failed = %d\n",
i, card->ctrl[i].stats.writes_failed);
seq_printf(m, "Ctrl %d Reads Issued = %d\n",
i, card->ctrl[i].stats.reads_issued);
seq_printf(m, "Ctrl %d Reads Failed = %d\n",
i, card->ctrl[i].stats.reads_failed);
seq_printf(m, "Ctrl %d Reads Retried = %d\n",
i, card->ctrl[i].stats.reads_retried);
seq_printf(m, "Ctrl %d Discards Issued = %d\n",
i, card->ctrl[i].stats.discards_issued);
seq_printf(m, "Ctrl %d Discards Failed = %d\n",
i, card->ctrl[i].stats.discards_failed);
seq_printf(m, "Ctrl %d DMA SW Errors = %d\n",
i, card->ctrl[i].stats.dma_sw_err);
seq_printf(m, "Ctrl %d DMA HW Faults = %d\n",
i, card->ctrl[i].stats.dma_hw_fault);
seq_printf(m, "Ctrl %d DMAs Cancelled = %d\n",
i, card->ctrl[i].stats.dma_cancelled);
seq_printf(m, "Ctrl %d SW Queue Depth = %d\n",
i, card->ctrl[i].stats.sw_q_depth);
seq_printf(m, "Ctrl %d HW Queue Depth = %d\n",
i, atomic_read(&card->ctrl[i].stats.hw_q_depth));
}
return 0;
}
static int rsxx_attr_stats_open(struct inode *inode, struct file *file)
{
return single_open(file, rsxx_attr_stats_show, inode->i_private);
}
static int rsxx_attr_pci_regs_open(struct inode *inode, struct file *file)
{
return single_open(file, rsxx_attr_pci_regs_show, inode->i_private);
}
static ssize_t rsxx_cram_read(struct file *fp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
struct rsxx_cram *info = fp->private_data;
struct rsxx_cardinfo *card = info->i_private;
char *buf;
int st;
buf = kzalloc(sizeof(*buf) * cnt, GFP_KERNEL);
if (!buf)
return -ENOMEM;
info->f_pos = (u32)*ppos + info->offset;
st = rsxx_creg_read(card, CREG_ADD_CRAM + info->f_pos, cnt, buf, 1);
if (st)
return st;
st = copy_to_user(ubuf, buf, cnt);
if (st)
return st;
info->offset += cnt;
kfree(buf);
return cnt;
}
static ssize_t rsxx_cram_write(struct file *fp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
struct rsxx_cram *info = fp->private_data;
struct rsxx_cardinfo *card = info->i_private;
char *buf;
int st;
buf = kzalloc(sizeof(*buf) * cnt, GFP_KERNEL);
if (!buf)
return -ENOMEM;
st = copy_from_user(buf, ubuf, cnt);
if (st)
return st;
info->f_pos = (u32)*ppos + info->offset;
st = rsxx_creg_write(card, CREG_ADD_CRAM + info->f_pos, cnt, buf, 1);
if (st)
return st;
info->offset += cnt;
kfree(buf);
return cnt;
}
static int rsxx_cram_open(struct inode *inode, struct file *file)
{
struct rsxx_cram *info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->i_private = inode->i_private;
info->f_pos = file->f_pos;
file->private_data = info;
return 0;
}
static int rsxx_cram_release(struct inode *inode, struct file *file)
{
struct rsxx_cram *info = file->private_data;
if (!info)
return 0;
kfree(info);
file->private_data = NULL;
return 0;
}
static const struct file_operations debugfs_cram_fops = {
.owner = THIS_MODULE,
.open = rsxx_cram_open,
.read = rsxx_cram_read,
.write = rsxx_cram_write,
.release = rsxx_cram_release,
};
static const struct file_operations debugfs_stats_fops = {
.owner = THIS_MODULE,
.open = rsxx_attr_stats_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations debugfs_pci_regs_fops = {
.owner = THIS_MODULE,
.open = rsxx_attr_pci_regs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void rsxx_debugfs_dev_new(struct rsxx_cardinfo *card)
{
struct dentry *debugfs_stats;
struct dentry *debugfs_pci_regs;
struct dentry *debugfs_cram;
card->debugfs_dir = debugfs_create_dir(card->gendisk->disk_name, NULL);
if (IS_ERR_OR_NULL(card->debugfs_dir))
goto failed_debugfs_dir;
debugfs_stats = debugfs_create_file("stats", S_IRUGO,
card->debugfs_dir, card,
&debugfs_stats_fops);
if (IS_ERR_OR_NULL(debugfs_stats))
goto failed_debugfs_stats;
debugfs_pci_regs = debugfs_create_file("pci_regs", S_IRUGO,
card->debugfs_dir, card,
&debugfs_pci_regs_fops);
if (IS_ERR_OR_NULL(debugfs_pci_regs))
goto failed_debugfs_pci_regs;
debugfs_cram = debugfs_create_file("cram", S_IRUGO | S_IWUSR,
card->debugfs_dir, card,
&debugfs_cram_fops);
if (IS_ERR_OR_NULL(debugfs_cram))
goto failed_debugfs_cram;
return;
failed_debugfs_cram:
debugfs_remove(debugfs_pci_regs);
failed_debugfs_pci_regs:
debugfs_remove(debugfs_stats);
failed_debugfs_stats:
debugfs_remove(card->debugfs_dir);
failed_debugfs_dir:
card->debugfs_dir = NULL;
}
/*----------------- Interrupt Control & Handling -------------------*/
static void rsxx_mask_interrupts(struct rsxx_cardinfo *card)
{
card->isr_mask = 0;
card->ier_mask = 0;
}
static void __enable_intr(unsigned int *mask, unsigned int intr)
{
*mask |= intr;
}
static void __disable_intr(unsigned int *mask, unsigned int intr)
{
*mask &= ~intr;
}
/*
* NOTE: Disabling the IER will disable the hardware interrupt.
* Disabling the ISR will disable the software handling of the ISR bit.
*
* Enable/Disable interrupt functions assume the card->irq_lock
* is held by the caller.
*/
void rsxx_enable_ier(struct rsxx_cardinfo *card, unsigned int intr)
{
if (unlikely(card->halt) ||
unlikely(card->eeh_state))
return;
__enable_intr(&card->ier_mask, intr);
iowrite32(card->ier_mask, card->regmap + IER);
}
void rsxx_disable_ier(struct rsxx_cardinfo *card, unsigned int intr)
{
if (unlikely(card->eeh_state))
return;
__disable_intr(&card->ier_mask, intr);
iowrite32(card->ier_mask, card->regmap + IER);
}
void rsxx_enable_ier_and_isr(struct rsxx_cardinfo *card,
unsigned int intr)
{
if (unlikely(card->halt) ||
unlikely(card->eeh_state))
return;
__enable_intr(&card->isr_mask, intr);
__enable_intr(&card->ier_mask, intr);
iowrite32(card->ier_mask, card->regmap + IER);
}
void rsxx_disable_ier_and_isr(struct rsxx_cardinfo *card,
unsigned int intr)
{
if (unlikely(card->eeh_state))
return;
__disable_intr(&card->isr_mask, intr);
__disable_intr(&card->ier_mask, intr);
iowrite32(card->ier_mask, card->regmap + IER);
}
static irqreturn_t rsxx_isr(int irq, void *pdata)
{
struct rsxx_cardinfo *card = pdata;
unsigned int isr;
int handled = 0;
int reread_isr;
int i;
spin_lock(&card->irq_lock);
do {
reread_isr = 0;
if (unlikely(card->eeh_state))
break;
isr = ioread32(card->regmap + ISR);
if (isr == 0xffffffff) {
/*
* A few systems seem to have an intermittent issue
* where PCI reads return all Fs, but retrying the read
* a little later will return as expected.
*/
dev_info(CARD_TO_DEV(card),
"ISR = 0xFFFFFFFF, retrying later\n");
break;
}
isr &= card->isr_mask;
if (!isr)
break;
for (i = 0; i < card->n_targets; i++) {
if (isr & CR_INTR_DMA(i)) {
if (card->ier_mask & CR_INTR_DMA(i)) {
rsxx_disable_ier(card, CR_INTR_DMA(i));
reread_isr = 1;
}
queue_work(card->ctrl[i].done_wq,
&card->ctrl[i].dma_done_work);
handled++;
}
}
if (isr & CR_INTR_CREG) {
queue_work(card->creg_ctrl.creg_wq,
&card->creg_ctrl.done_work);
handled++;
}
if (isr & CR_INTR_EVENT) {
queue_work(card->event_wq, &card->event_work);
rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
handled++;
}
} while (reread_isr);
spin_unlock(&card->irq_lock);
return handled ? IRQ_HANDLED : IRQ_NONE;
}
/*----------------- Card Event Handler -------------------*/
static const char * const rsxx_card_state_to_str(unsigned int state)
{
static const char * const state_strings[] = {
"Unknown", "Shutdown", "Starting", "Formatting",
"Uninitialized", "Good", "Shutting Down",
"Fault", "Read Only Fault", "dStroying"
};
return state_strings[ffs(state)];
}
static void card_state_change(struct rsxx_cardinfo *card,
unsigned int new_state)
{
int st;
dev_info(CARD_TO_DEV(card),
"card state change detected.(%s -> %s)\n",
rsxx_card_state_to_str(card->state),
rsxx_card_state_to_str(new_state));
card->state = new_state;
/* Don't attach DMA interfaces if the card has an invalid config */
if (!card->config_valid)
return;
switch (new_state) {
case CARD_STATE_RD_ONLY_FAULT:
dev_crit(CARD_TO_DEV(card),
"Hardware has entered read-only mode!\n");
/*
* Fall through so the DMA devices can be attached and
* the user can attempt to pull off their data.
*/
case CARD_STATE_GOOD:
st = rsxx_get_card_size8(card, &card->size8);
if (st)
dev_err(CARD_TO_DEV(card),
"Failed attaching DMA devices\n");
if (card->config_valid)
set_capacity(card->gendisk, card->size8 >> 9);
break;
case CARD_STATE_FAULT:
dev_crit(CARD_TO_DEV(card),
"Hardware Fault reported!\n");
/* Fall through. */
/* Everything else, detach DMA interface if it's attached. */
case CARD_STATE_SHUTDOWN:
case CARD_STATE_STARTING:
case CARD_STATE_FORMATTING:
case CARD_STATE_UNINITIALIZED:
case CARD_STATE_SHUTTING_DOWN:
/*
* dStroy is a term coined by marketing to represent the low level
* secure erase.
*/
case CARD_STATE_DSTROYING:
set_capacity(card->gendisk, 0);
break;
}
}
static void card_event_handler(struct work_struct *work)
{
struct rsxx_cardinfo *card;
unsigned int state;
unsigned long flags;
int st;
card = container_of(work, struct rsxx_cardinfo, event_work);
if (unlikely(card->halt))
return;
/*
* Enable the interrupt now to avoid any weird race conditions where a
* state change might occur while rsxx_get_card_state() is
* processing a returned creg cmd.
*/
spin_lock_irqsave(&card->irq_lock, flags);
rsxx_enable_ier_and_isr(card, CR_INTR_EVENT);
spin_unlock_irqrestore(&card->irq_lock, flags);
st = rsxx_get_card_state(card, &state);
if (st) {
dev_info(CARD_TO_DEV(card),
"Failed reading state after event.\n");
return;
}
if (card->state != state)
card_state_change(card, state);
if (card->creg_ctrl.creg_stats.stat & CREG_STAT_LOG_PENDING)
rsxx_read_hw_log(card);
}
/*----------------- Card Operations -------------------*/
static int card_shutdown(struct rsxx_cardinfo *card)
{
unsigned int state;
signed long start;
const int timeout = msecs_to_jiffies(120000);
int st;
/* We can't issue a shutdown if the card is in a transition state */
start = jiffies;
do {
st = rsxx_get_card_state(card, &state);
if (st)
return st;
} while (state == CARD_STATE_STARTING &&
(jiffies - start < timeout));
if (state == CARD_STATE_STARTING)
return -ETIMEDOUT;
/* Only issue a shutdown if we need to */
if ((state != CARD_STATE_SHUTTING_DOWN) &&
(state != CARD_STATE_SHUTDOWN)) {
st = rsxx_issue_card_cmd(card, CARD_CMD_SHUTDOWN);
if (st)
return st;
}
start = jiffies;
do {
st = rsxx_get_card_state(card, &state);
if (st)
return st;
} while (state != CARD_STATE_SHUTDOWN &&
(jiffies - start < timeout));
if (state != CARD_STATE_SHUTDOWN)
return -ETIMEDOUT;
return 0;
}
static int rsxx_eeh_frozen(struct pci_dev *dev)
{
struct rsxx_cardinfo *card = pci_get_drvdata(dev);
int i;
int st;
dev_warn(&dev->dev, "IBM Flash Adapter PCI: preparing for slot reset.\n");
card->eeh_state = 1;
rsxx_mask_interrupts(card);
/*
* We need to guarantee that the write for eeh_state and masking
* interrupts does not become reordered. This will prevent a possible
* race condition with the EEH code.
*/
wmb();
pci_disable_device(dev);
st = rsxx_eeh_save_issued_dmas(card);
if (st)
return st;
rsxx_eeh_save_issued_creg(card);
for (i = 0; i < card->n_targets; i++) {
if (card->ctrl[i].status.buf)
pci_free_consistent(card->dev, STATUS_BUFFER_SIZE8,
card->ctrl[i].status.buf,
card->ctrl[i].status.dma_addr);
if (card->ctrl[i].cmd.buf)
pci_free_consistent(card->dev, COMMAND_BUFFER_SIZE8,
card->ctrl[i].cmd.buf,
card->ctrl[i].cmd.dma_addr);
}
return 0;
}
static void rsxx_eeh_failure(struct pci_dev *dev)
{
struct rsxx_cardinfo *card = pci_get_drvdata(dev);
int i;
int cnt = 0;
dev_err(&dev->dev, "IBM Flash Adapter PCI: disabling failed card.\n");
card->eeh_state = 1;
card->halt = 1;
for (i = 0; i < card->n_targets; i++) {
spin_lock_bh(&card->ctrl[i].queue_lock);
cnt = rsxx_cleanup_dma_queue(&card->ctrl[i],
&card->ctrl[i].queue,
COMPLETE_DMA);
spin_unlock_bh(&card->ctrl[i].queue_lock);
cnt += rsxx_dma_cancel(&card->ctrl[i]);
if (cnt)
dev_info(CARD_TO_DEV(card),
"Freed %d queued DMAs on channel %d\n",
cnt, card->ctrl[i].id);
}
}
static int rsxx_eeh_fifo_flush_poll(struct rsxx_cardinfo *card)
{
unsigned int status;
int iter = 0;
/* We need to wait for the hardware to reset */
while (iter++ < 10) {
status = ioread32(card->regmap + PCI_RECONFIG);
if (status & RSXX_FLUSH_BUSY) {
ssleep(1);
continue;
}
if (status & RSXX_FLUSH_TIMEOUT)
dev_warn(CARD_TO_DEV(card), "HW: flash controller timeout\n");
return 0;
}
/* Hardware failed resetting itself. */
return -1;
}
static pci_ers_result_t rsxx_error_detected(struct pci_dev *dev,
enum pci_channel_state error)
{
int st;
if (dev->revision < RSXX_EEH_SUPPORT)
return PCI_ERS_RESULT_NONE;
if (error == pci_channel_io_perm_failure) {
rsxx_eeh_failure(dev);
return PCI_ERS_RESULT_DISCONNECT;
}
st = rsxx_eeh_frozen(dev);
if (st) {
dev_err(&dev->dev, "Slot reset setup failed\n");
rsxx_eeh_failure(dev);
return PCI_ERS_RESULT_DISCONNECT;
}
return PCI_ERS_RESULT_NEED_RESET;
}
static pci_ers_result_t rsxx_slot_reset(struct pci_dev *dev)
{
struct rsxx_cardinfo *card = pci_get_drvdata(dev);
unsigned long flags;
int i;
int st;
dev_warn(&dev->dev,
"IBM Flash Adapter PCI: recovering from slot reset.\n");
st = pci_enable_device(dev);
if (st)
goto failed_hw_setup;
pci_set_master(dev);
st = rsxx_eeh_fifo_flush_poll(card);
if (st)
goto failed_hw_setup;
rsxx_dma_queue_reset(card);
for (i = 0; i < card->n_targets; i++) {
st = rsxx_hw_buffers_init(dev, &card->ctrl[i]);
if (st)
goto failed_hw_buffers_init;
}
if (card->config_valid)
rsxx_dma_configure(card);
/* Clears the ISR register from spurious interrupts */
st = ioread32(card->regmap + ISR);
card->eeh_state = 0;
spin_lock_irqsave(&card->irq_lock, flags);
if (card->n_targets & RSXX_MAX_TARGETS)
rsxx_enable_ier_and_isr(card, CR_INTR_ALL_G);
else
rsxx_enable_ier_and_isr(card, CR_INTR_ALL_C);
spin_unlock_irqrestore(&card->irq_lock, flags);
rsxx_kick_creg_queue(card);
for (i = 0; i < card->n_targets; i++) {
spin_lock(&card->ctrl[i].queue_lock);
if (list_empty(&card->ctrl[i].queue)) {
spin_unlock(&card->ctrl[i].queue_lock);
continue;
}
spin_unlock(&card->ctrl[i].queue_lock);
queue_work(card->ctrl[i].issue_wq,
&card->ctrl[i].issue_dma_work);
}
dev_info(&dev->dev, "IBM Flash Adapter PCI: recovery complete.\n");
return PCI_ERS_RESULT_RECOVERED;
failed_hw_buffers_init:
for (i = 0; i < card->n_targets; i++) {
if (card->ctrl[i].status.buf)
pci_free_consistent(card->dev,
STATUS_BUFFER_SIZE8,
card->ctrl[i].status.buf,
card->ctrl[i].status.dma_addr);
if (card->ctrl[i].cmd.buf)
pci_free_consistent(card->dev,
COMMAND_BUFFER_SIZE8,
card->ctrl[i].cmd.buf,
card->ctrl[i].cmd.dma_addr);
}
failed_hw_setup:
rsxx_eeh_failure(dev);
return PCI_ERS_RESULT_DISCONNECT;
}
/*----------------- Driver Initialization & Setup -------------------*/
/* Returns: 0 if the driver is compatible with the device
-1 if the driver is NOT compatible with the device */
static int rsxx_compatibility_check(struct rsxx_cardinfo *card)
{
unsigned char pci_rev;
pci_read_config_byte(card->dev, PCI_REVISION_ID, &pci_rev);
if (pci_rev > RS70_PCI_REV_SUPPORTED)
return -1;
return 0;
}
static int rsxx_pci_probe(struct pci_dev *dev,
const struct pci_device_id *id)
{
struct rsxx_cardinfo *card;
int st;
unsigned int sync_timeout;
dev_info(&dev->dev, "PCI-Flash SSD discovered\n");
card = kzalloc(sizeof(*card), GFP_KERNEL);
if (!card)
return -ENOMEM;
card->dev = dev;
pci_set_drvdata(dev, card);
do {
if (!ida_pre_get(&rsxx_disk_ida, GFP_KERNEL)) {
st = -ENOMEM;
goto failed_ida_get;
}
spin_lock(&rsxx_ida_lock);
st = ida_get_new(&rsxx_disk_ida, &card->disk_id);
spin_unlock(&rsxx_ida_lock);
} while (st == -EAGAIN);
if (st)
goto failed_ida_get;
st = pci_enable_device(dev);
if (st)
goto failed_enable;
pci_set_master(dev);
pci_set_dma_max_seg_size(dev, RSXX_HW_BLK_SIZE);
st = pci_set_dma_mask(dev, DMA_BIT_MASK(64));
if (st) {
dev_err(CARD_TO_DEV(card),
"No usable DMA configuration,aborting\n");
goto failed_dma_mask;
}
st = pci_request_regions(dev, DRIVER_NAME);
if (st) {
dev_err(CARD_TO_DEV(card),
"Failed to request memory region\n");
goto failed_request_regions;
}
if (pci_resource_len(dev, 0) == 0) {
dev_err(CARD_TO_DEV(card), "BAR0 has length 0!\n");
st = -ENOMEM;
goto failed_iomap;
}
card->regmap = pci_iomap(dev, 0, 0);
if (!card->regmap) {
dev_err(CARD_TO_DEV(card), "Failed to map BAR0\n");
st = -ENOMEM;
goto failed_iomap;
}
spin_lock_init(&card->irq_lock);
card->halt = 0;
card->eeh_state = 0;
spin_lock_irq(&card->irq_lock);
rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
spin_unlock_irq(&card->irq_lock);
if (!force_legacy) {
st = pci_enable_msi(dev);
if (st)
dev_warn(CARD_TO_DEV(card),
"Failed to enable MSI\n");
}
st = request_irq(dev->irq, rsxx_isr, IRQF_DISABLED | IRQF_SHARED,
DRIVER_NAME, card);
if (st) {
dev_err(CARD_TO_DEV(card),
"Failed requesting IRQ%d\n", dev->irq);
goto failed_irq;
}
/************* Setup Processor Command Interface *************/
st = rsxx_creg_setup(card);
if (st) {
dev_err(CARD_TO_DEV(card), "Failed to setup creg interface.\n");
goto failed_creg_setup;
}
spin_lock_irq(&card->irq_lock);
rsxx_enable_ier_and_isr(card, CR_INTR_CREG);
spin_unlock_irq(&card->irq_lock);
st = rsxx_compatibility_check(card);
if (st) {
dev_warn(CARD_TO_DEV(card),
"Incompatible driver detected. Please update the driver.\n");
st = -EINVAL;
goto failed_compatiblity_check;
}
/************* Load Card Config *************/
st = rsxx_load_config(card);
if (st)
dev_err(CARD_TO_DEV(card),
"Failed loading card config\n");
/************* Setup DMA Engine *************/
st = rsxx_get_num_targets(card, &card->n_targets);
if (st)
dev_info(CARD_TO_DEV(card),
"Failed reading the number of DMA targets\n");
card->ctrl = kzalloc(card->n_targets * sizeof(*card->ctrl), GFP_KERNEL);
if (!card->ctrl) {
st = -ENOMEM;
goto failed_dma_setup;
}
st = rsxx_dma_setup(card);
if (st) {
dev_info(CARD_TO_DEV(card),
"Failed to setup DMA engine\n");
goto failed_dma_setup;
}
/************* Setup Card Event Handler *************/
card->event_wq = create_singlethread_workqueue(DRIVER_NAME"_event");
if (!card->event_wq) {
dev_err(CARD_TO_DEV(card), "Failed card event setup.\n");
goto failed_event_handler;
}
INIT_WORK(&card->event_work, card_event_handler);
st = rsxx_setup_dev(card);
if (st)
goto failed_create_dev;
rsxx_get_card_state(card, &card->state);
dev_info(CARD_TO_DEV(card),
"card state: %s\n",
rsxx_card_state_to_str(card->state));
/*
* Now that the DMA Engine and devices have been setup,
* we can enable the event interrupt(it kicks off actions in
* those layers so we couldn't enable it right away.)
*/
spin_lock_irq(&card->irq_lock);
rsxx_enable_ier_and_isr(card, CR_INTR_EVENT);
spin_unlock_irq(&card->irq_lock);
if (card->state == CARD_STATE_SHUTDOWN) {
st = rsxx_issue_card_cmd(card, CARD_CMD_STARTUP);
if (st)
dev_crit(CARD_TO_DEV(card),
"Failed issuing card startup\n");
if (sync_start) {
sync_timeout = SYNC_START_TIMEOUT;
dev_info(CARD_TO_DEV(card),
"Waiting for card to startup\n");
do {
ssleep(1);
sync_timeout--;
rsxx_get_card_state(card, &card->state);
} while (sync_timeout &&
(card->state == CARD_STATE_STARTING));
if (card->state == CARD_STATE_STARTING) {
dev_warn(CARD_TO_DEV(card),
"Card startup timed out\n");
card->size8 = 0;
} else {
dev_info(CARD_TO_DEV(card),
"card state: %s\n",
rsxx_card_state_to_str(card->state));
st = rsxx_get_card_size8(card, &card->size8);
if (st)
card->size8 = 0;
}
}
} else if (card->state == CARD_STATE_GOOD ||
card->state == CARD_STATE_RD_ONLY_FAULT) {
st = rsxx_get_card_size8(card, &card->size8);
if (st)
card->size8 = 0;
}
rsxx_attach_dev(card);
/************* Setup Debugfs *************/
rsxx_debugfs_dev_new(card);
return 0;
failed_create_dev:
destroy_workqueue(card->event_wq);
card->event_wq = NULL;
failed_event_handler:
rsxx_dma_destroy(card);
failed_dma_setup:
failed_compatiblity_check:
destroy_workqueue(card->creg_ctrl.creg_wq);
card->creg_ctrl.creg_wq = NULL;
failed_creg_setup:
spin_lock_irq(&card->irq_lock);
rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
spin_unlock_irq(&card->irq_lock);
free_irq(dev->irq, card);
if (!force_legacy)
pci_disable_msi(dev);
failed_irq:
pci_iounmap(dev, card->regmap);
failed_iomap:
pci_release_regions(dev);
failed_request_regions:
failed_dma_mask:
pci_disable_device(dev);
failed_enable:
spin_lock(&rsxx_ida_lock);
ida_remove(&rsxx_disk_ida, card->disk_id);
spin_unlock(&rsxx_ida_lock);
failed_ida_get:
kfree(card);
return st;
}
static void rsxx_pci_remove(struct pci_dev *dev)
{
struct rsxx_cardinfo *card = pci_get_drvdata(dev);
unsigned long flags;
int st;
int i;
if (!card)
return;
dev_info(CARD_TO_DEV(card),
"Removing PCI-Flash SSD.\n");
rsxx_detach_dev(card);
for (i = 0; i < card->n_targets; i++) {
spin_lock_irqsave(&card->irq_lock, flags);
rsxx_disable_ier_and_isr(card, CR_INTR_DMA(i));
spin_unlock_irqrestore(&card->irq_lock, flags);
}
st = card_shutdown(card);
if (st)
dev_crit(CARD_TO_DEV(card), "Shutdown failed!\n");
/* Sync outstanding event handlers. */
spin_lock_irqsave(&card->irq_lock, flags);
rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
spin_unlock_irqrestore(&card->irq_lock, flags);
cancel_work_sync(&card->event_work);
rsxx_destroy_dev(card);
rsxx_dma_destroy(card);
spin_lock_irqsave(&card->irq_lock, flags);
rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
spin_unlock_irqrestore(&card->irq_lock, flags);
/* Prevent work_structs from re-queuing themselves. */
card->halt = 1;
debugfs_remove_recursive(card->debugfs_dir);
free_irq(dev->irq, card);
if (!force_legacy)
pci_disable_msi(dev);
rsxx_creg_destroy(card);
pci_iounmap(dev, card->regmap);
pci_disable_device(dev);
pci_release_regions(dev);
kfree(card);
}
static int rsxx_pci_suspend(struct pci_dev *dev, pm_message_t state)
{
/* We don't support suspend at this time. */
return -ENOSYS;
}
static void rsxx_pci_shutdown(struct pci_dev *dev)
{
struct rsxx_cardinfo *card = pci_get_drvdata(dev);
unsigned long flags;
int i;
if (!card)
return;
dev_info(CARD_TO_DEV(card), "Shutting down PCI-Flash SSD.\n");
rsxx_detach_dev(card);
for (i = 0; i < card->n_targets; i++) {
spin_lock_irqsave(&card->irq_lock, flags);
rsxx_disable_ier_and_isr(card, CR_INTR_DMA(i));
spin_unlock_irqrestore(&card->irq_lock, flags);
}
card_shutdown(card);
}
static const struct pci_error_handlers rsxx_err_handler = {
.error_detected = rsxx_error_detected,
.slot_reset = rsxx_slot_reset,
};
static DEFINE_PCI_DEVICE_TABLE(rsxx_pci_ids) = {
{PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_FS70_FLASH)},
{PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_FS80_FLASH)},
{0,},
};
MODULE_DEVICE_TABLE(pci, rsxx_pci_ids);
static struct pci_driver rsxx_pci_driver = {
.name = DRIVER_NAME,
.id_table = rsxx_pci_ids,
.probe = rsxx_pci_probe,
.remove = rsxx_pci_remove,
.suspend = rsxx_pci_suspend,
.shutdown = rsxx_pci_shutdown,
.err_handler = &rsxx_err_handler,
};
static int __init rsxx_core_init(void)
{
int st;
st = rsxx_dev_init();
if (st)
return st;
st = rsxx_dma_init();
if (st)
goto dma_init_failed;
st = rsxx_creg_init();
if (st)
goto creg_init_failed;
return pci_register_driver(&rsxx_pci_driver);
creg_init_failed:
rsxx_dma_cleanup();
dma_init_failed:
rsxx_dev_cleanup();
return st;
}
static void __exit rsxx_core_cleanup(void)
{
pci_unregister_driver(&rsxx_pci_driver);
rsxx_creg_cleanup();
rsxx_dma_cleanup();
rsxx_dev_cleanup();
}
module_init(rsxx_core_init);
module_exit(rsxx_core_cleanup);
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