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Date: Sun, 8 Apr 2012 19:28:00 -0700
From: Asai Thambi S P <asamymuthupa@...ron.com>
To: Jens Axboe <axboe@...nel.dk>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Greg KH <greg@...ah.com>, Sam Bradshaw <sbradshaw@...ron.com>
Subject: [PATCH v2 1/7] mtip32xx: Add new bitwise flag 'dd_flag'
* Merged the following flags into one variable 'dd_flag':
* drv_cleanup_done
* resumeflag
* Added the following flags into 'dd_flag'
* remove pending
* init done
* Removed 'ftlrebuildflag' (similar flag is already part of mti_port->flags)
Signed-off-by: Asai Thambi S P <asamymuthupa@...ron.com>
---
drivers/block/mtip32xx/mtip32xx.c | 211 ++++++++++++++++++++++++++++---------
drivers/block/mtip32xx/mtip32xx.h | 12 ++-
2 files changed, 168 insertions(+), 55 deletions(-)
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index c37073d..34b395d 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -36,6 +36,7 @@
#include <linux/idr.h>
#include <linux/kthread.h>
#include <../drivers/ata/ahci.h>
+#include <linux/export.h>
#include "mtip32xx.h"
#define HW_CMD_SLOT_SZ (MTIP_MAX_COMMAND_SLOTS * 32)
@@ -44,6 +45,7 @@
#define HW_PORT_PRIV_DMA_SZ \
(HW_CMD_SLOT_SZ + HW_CMD_TBL_AR_SZ + AHCI_RX_FIS_SZ)
+#define HOST_CAP_NZDMA (1 << 19)
#define HOST_HSORG 0xFC
#define HSORG_DISABLE_SLOTGRP_INTR (1<<24)
#define HSORG_DISABLE_SLOTGRP_PXIS (1<<16)
@@ -139,6 +141,12 @@ static void mtip_command_cleanup(struct driver_data *dd)
int group = 0, commandslot = 0, commandindex = 0;
struct mtip_cmd *command;
struct mtip_port *port = dd->port;
+ static int in_progress;
+
+ if (in_progress)
+ return;
+
+ in_progress = 1;
for (group = 0; group < 4; group++) {
for (commandslot = 0; commandslot < 32; commandslot++) {
@@ -165,7 +173,8 @@ static void mtip_command_cleanup(struct driver_data *dd)
up(&port->cmd_slot);
- atomic_set(&dd->drv_cleanup_done, true);
+ set_bit(MTIP_DD_FLAG_CLEANUP_BIT, &dd->dd_flag);
+ in_progress = 0;
}
/*
@@ -262,6 +271,9 @@ static int hba_reset_nosleep(struct driver_data *dd)
&& time_before(jiffies, timeout))
mdelay(1);
+ if (test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT, &dd->dd_flag))
+ return -1;
+
if (readl(dd->mmio + HOST_CTL) & HOST_RESET)
return -1;
@@ -451,6 +463,9 @@ static void mtip_restart_port(struct mtip_port *port)
&& time_before(jiffies, timeout))
;
+ if (test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT, &port->dd->dd_flag))
+ return;
+
/*
* Chip quirk: escalate to hba reset if
* PxCMD.CR not clear after 500 ms
@@ -479,6 +494,9 @@ static void mtip_restart_port(struct mtip_port *port)
while (time_before(jiffies, timeout))
;
+ if (test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT, &port->dd->dd_flag))
+ return;
+
/* Clear PxSCTL.DET */
writel(readl(port->mmio + PORT_SCR_CTL) & ~1,
port->mmio + PORT_SCR_CTL);
@@ -490,6 +508,9 @@ static void mtip_restart_port(struct mtip_port *port)
&& time_before(jiffies, timeout))
;
+ if (test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT, &port->dd->dd_flag))
+ return;
+
if ((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
dev_warn(&port->dd->pdev->dev,
"COM reset failed\n");
@@ -520,7 +541,7 @@ static void mtip_timeout_function(unsigned long int data)
if (unlikely(!port))
return;
- if (atomic_read(&port->dd->resumeflag) == true) {
+ if (test_bit(MTIP_DD_FLAG_RESUME_BIT, &port->dd->dd_flag)) {
mod_timer(&port->cmd_timer,
jiffies + msecs_to_jiffies(30000));
return;
@@ -970,6 +991,9 @@ static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
/* don't proceed further */
return IRQ_HANDLED;
}
+ if (test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT,
+ &dd->dd_flag))
+ return rv;
mtip_process_errors(dd, port_stat & PORT_IRQ_ERR);
}
@@ -1040,6 +1064,9 @@ static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
msleep(20);
continue; /* svc thd is actively issuing commands */
}
+ if (test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT,
+ &port->dd->dd_flag))
+ return -EFAULT;
/*
* Ignore s_active bit 0 of array element 0.
* This bit will always be set
@@ -1161,6 +1188,12 @@ static int mtip_exec_internal_command(struct mtip_port *port,
"Internal command did not complete [%d] "
"within timeout of %lu ms\n",
atomic, timeout);
+ if (mtip_check_surprise_removal(port->dd->pdev) ||
+ test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT,
+ &port->dd->dd_flag)) {
+ rv = -ENXIO;
+ goto exec_ic_exit;
+ }
rv = -EAGAIN;
}
@@ -1168,6 +1201,15 @@ static int mtip_exec_internal_command(struct mtip_port *port,
& (1 << MTIP_TAG_INTERNAL)) {
dev_warn(&port->dd->pdev->dev,
"Retiring internal command but CI is 1.\n");
+ if (test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT,
+ &port->dd->dd_flag)) {
+ hba_reset_nosleep(port->dd);
+ rv = -ENXIO;
+ } else {
+ mtip_restart_port(port);
+ rv = -EAGAIN;
+ }
+ goto exec_ic_exit;
}
} else {
@@ -1177,8 +1219,14 @@ static int mtip_exec_internal_command(struct mtip_port *port,
while ((readl(
port->cmd_issue[MTIP_TAG_INTERNAL])
& (1 << MTIP_TAG_INTERNAL))
- && time_before(jiffies, timeout))
- ;
+ && time_before(jiffies, timeout)) {
+ if (mtip_check_surprise_removal(port->dd->pdev) ||
+ test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT,
+ &port->dd->dd_flag)) {
+ rv = -ENXIO;
+ goto exec_ic_exit;
+ }
+ }
if (readl(port->cmd_issue[MTIP_TAG_INTERNAL])
& (1 << MTIP_TAG_INTERNAL)) {
@@ -1186,9 +1234,17 @@ static int mtip_exec_internal_command(struct mtip_port *port,
"Internal command did not complete [%d]\n",
atomic);
rv = -EAGAIN;
+ if (test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT,
+ &port->dd->dd_flag)) {
+ hba_reset_nosleep(port->dd);
+ rv = -ENXIO;
+ } else {
+ mtip_restart_port(port);
+ rv = -EAGAIN;
+ }
}
}
-
+exec_ic_exit:
/* Clear the allocated and active bits for the internal command. */
atomic_set(&int_cmd->active, 0);
release_slot(port, MTIP_TAG_INTERNAL);
@@ -1242,6 +1298,9 @@ static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
int rv = 0;
struct host_to_dev_fis fis;
+ if (test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT, &port->dd->dd_flag))
+ return -EFAULT;
+
/* Build the FIS. */
memset(&fis, 0, sizeof(struct host_to_dev_fis));
fis.type = 0x27;
@@ -1507,9 +1566,7 @@ static int exec_drive_task(struct mtip_port *port, u8 *command)
fis.device = command[6] & ~0x10; /* Clear the dev bit*/
- dbg_printk(MTIP_DRV_NAME "%s: User Command: cmd %x, feat %x, "
- "nsect %x, sect %x, lcyl %x, "
- "hcyl %x, sel %x\n",
+ dbg_printk(MTIP_DRV_NAME "%s: User Command: cmd %x, feat %x, nsect %x, sect %x, lcyl %x, hcyl %x, sel %x\n",
__func__,
command[0],
command[1],
@@ -1536,8 +1593,7 @@ static int exec_drive_task(struct mtip_port *port, u8 *command)
command[4] = reply->cyl_low;
command[5] = reply->cyl_hi;
- dbg_printk(MTIP_DRV_NAME "%s: Completion Status: stat %x, "
- "err %x , cyl_lo %x cyl_hi %x\n",
+ dbg_printk(MTIP_DRV_NAME "%s: Completion Status: stat %x, err %x , cyl_lo %x cyl_hi %x\n",
__func__,
command[0],
command[1],
@@ -2082,14 +2138,10 @@ static void mtip_hw_submit_io(struct driver_data *dd, sector_t start,
struct host_to_dev_fis *fis;
struct mtip_port *port = dd->port;
struct mtip_cmd *command = &port->commands[tag];
+ int dma_dir = (dir == READ) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
/* Map the scatter list for DMA access */
- if (dir == READ)
- nents = dma_map_sg(&dd->pdev->dev, command->sg,
- nents, DMA_FROM_DEVICE);
- else
- nents = dma_map_sg(&dd->pdev->dev, command->sg,
- nents, DMA_TO_DEVICE);
+ nents = dma_map_sg(&dd->pdev->dev, command->sg, nents, dma_dir);
command->scatter_ents = nents;
@@ -2129,7 +2181,7 @@ static void mtip_hw_submit_io(struct driver_data *dd, sector_t start,
*/
command->comp_data = dd;
command->comp_func = mtip_async_complete;
- command->direction = (dir == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+ command->direction = dma_dir;
/*
* Set the completion function and data for the command passed
@@ -2193,6 +2245,10 @@ static struct scatterlist *mtip_hw_get_scatterlist(struct driver_data *dd,
down(&dd->port->cmd_slot);
*tag = get_slot(dd->port);
+ if (unlikely(test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT, &dd->dd_flag))) {
+ up(&dd->port->cmd_slot);
+ return NULL;
+ }
if (unlikely(*tag < 0))
return NULL;
@@ -2209,7 +2265,7 @@ static struct scatterlist *mtip_hw_get_scatterlist(struct driver_data *dd,
* return value
* The size, in bytes, of the data copied into buf.
*/
-static ssize_t hw_show_registers(struct device *dev,
+static ssize_t mtip_hw_show_registers(struct device *dev,
struct device_attribute *attr,
char *buf)
{
@@ -2255,7 +2311,7 @@ static ssize_t hw_show_registers(struct device *dev,
return size;
}
-static DEVICE_ATTR(registers, S_IRUGO, hw_show_registers, NULL);
+static DEVICE_ATTR(registers, S_IRUGO, mtip_hw_show_registers, NULL);
/*
* Create the sysfs related attributes.
@@ -2386,10 +2442,12 @@ static int mtip_ftl_rebuild_poll(struct driver_data *dd)
"FTL rebuild in progress. Polling for completion.\n");
start = jiffies;
- dd->ftlrebuildflag = 1;
timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);
do {
+ if (unlikely(test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT,
+ &dd->dd_flag)))
+ return -EFAULT;
if (mtip_check_surprise_removal(dd->pdev))
return -EFAULT;
@@ -2410,22 +2468,17 @@ static int mtip_ftl_rebuild_poll(struct driver_data *dd)
dev_warn(&dd->pdev->dev,
"FTL rebuild complete (%d secs).\n",
jiffies_to_msecs(jiffies - start) / 1000);
- dd->ftlrebuildflag = 0;
mtip_block_initialize(dd);
- break;
+ return 0;
}
ssleep(10);
} while (time_before(jiffies, timeout));
/* Check for timeout */
- if (dd->ftlrebuildflag) {
- dev_err(&dd->pdev->dev,
+ dev_err(&dd->pdev->dev,
"Timed out waiting for FTL rebuild to complete (%d secs).\n",
jiffies_to_msecs(jiffies - start) / 1000);
- return -EFAULT;
- }
-
- return 0;
+ return -EFAULT;
}
/*
@@ -2456,6 +2509,9 @@ static int mtip_service_thread(void *data)
if (kthread_should_stop())
break;
+ if (unlikely(test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT,
+ &dd->dd_flag)))
+ break;
set_bit(MTIP_FLAG_SVC_THD_ACTIVE_BIT, &port->flags);
if (test_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags)) {
slot = 1;
@@ -2515,6 +2571,7 @@ static int mtip_hw_init(struct driver_data *dd)
int i;
int rv;
unsigned int num_command_slots;
+ unsigned long timeout, timetaken;
dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];
@@ -2625,14 +2682,43 @@ static int mtip_hw_init(struct driver_data *dd)
dd->port->mmio + i*0x80 + PORT_SDBV;
}
- /* Reset the HBA. */
- if (mtip_hba_reset(dd) < 0) {
- dev_err(&dd->pdev->dev,
- "Card did not reset within timeout\n");
- rv = -EIO;
+ timetaken = jiffies;
+ timeout = jiffies + msecs_to_jiffies(30000);
+ while (((readl(dd->port->mmio + PORT_SCR_STAT) & 0x0F) != 0x03) &&
+ time_before(jiffies, timeout)) {
+ mdelay(100);
+ }
+ if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
+ timetaken = jiffies - timetaken;
+ dev_warn(&dd->pdev->dev,
+ "Surprise removal detected at %u ms\n",
+ jiffies_to_msecs(timetaken));
+ rv = -ENODEV;
+ goto out2 ;
+ }
+ if (unlikely(test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT, &dd->dd_flag))) {
+ timetaken = jiffies - timetaken;
+ dev_warn(&dd->pdev->dev,
+ "Removal detected at %u ms\n",
+ jiffies_to_msecs(timetaken));
+ rv = -EFAULT;
goto out2;
}
+ /* Conditionally reset the HBA. */
+ if (!(readl(dd->mmio + HOST_CAP) & HOST_CAP_NZDMA)) {
+ if (mtip_hba_reset(dd) < 0) {
+ dev_err(&dd->pdev->dev,
+ "Card did not reset within timeout\n");
+ rv = -EIO;
+ goto out2;
+ }
+ } else {
+ /* Clear any pending interrupts on the HBA */
+ writel(readl(dd->mmio + HOST_IRQ_STAT),
+ dd->mmio + HOST_IRQ_STAT);
+ }
+
mtip_init_port(dd->port);
mtip_start_port(dd->port);
@@ -2662,6 +2748,12 @@ static int mtip_hw_init(struct driver_data *dd)
mod_timer(&dd->port->cmd_timer,
jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
+
+ if (test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT, &dd->dd_flag)) {
+ rv = -EFAULT;
+ goto out3;
+ }
+
if (mtip_get_identify(dd->port, NULL) < 0) {
rv = -EFAULT;
goto out3;
@@ -2714,9 +2806,12 @@ static int mtip_hw_exit(struct driver_data *dd)
* Send standby immediate (E0h) to the drive so that it
* saves its state.
*/
- if (atomic_read(&dd->drv_cleanup_done) != true) {
+ if (!test_bit(MTIP_DD_FLAG_CLEANUP_BIT, &dd->dd_flag)) {
- mtip_standby_immediate(dd->port);
+ if (test_bit(MTIP_FLAG_REBUILD_BIT, &dd->dd_flag))
+ if (mtip_standby_immediate(dd->port))
+ dev_warn(&dd->pdev->dev,
+ "STANDBY IMMEDIATE failed\n");
/* de-initialize the port. */
mtip_deinit_port(dd->port);
@@ -2894,6 +2989,9 @@ static int mtip_block_ioctl(struct block_device *dev,
if (!dd)
return -ENOTTY;
+ if (unlikely(test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT, &dd->dd_flag)))
+ return -ENOTTY;
+
switch (cmd) {
case BLKFLSBUF:
return -ENOTTY;
@@ -2929,6 +3027,9 @@ static int mtip_block_compat_ioctl(struct block_device *dev,
if (!dd)
return -ENOTTY;
+ if (unlikely(test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT, &dd->dd_flag)))
+ return -ENOTTY;
+
switch (cmd) {
case BLKFLSBUF:
return -ENOTTY;
@@ -3051,6 +3152,11 @@ static void mtip_make_request(struct request_queue *queue, struct bio *bio)
int nents = 0;
int tag = 0;
+ if (test_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT, &dd->dd_flag)) {
+ bio_endio(bio, -ENXIO);
+ return;
+ }
+
if (unlikely(!bio_has_data(bio))) {
blk_queue_flush(queue, 0);
bio_endio(bio, 0);
@@ -3063,7 +3169,7 @@ static void mtip_make_request(struct request_queue *queue, struct bio *bio)
if (unlikely((bio)->bi_vcnt > MTIP_MAX_SG)) {
dev_warn(&dd->pdev->dev,
- "Maximum number of SGL entries exceeded");
+ "Maximum number of SGL entries exceeded\n");
bio_io_error(bio);
mtip_hw_release_scatterlist(dd, tag);
return;
@@ -3212,8 +3318,10 @@ skip_create_disk:
kobject_put(kobj);
}
- if (dd->mtip_svc_handler)
+ if (dd->mtip_svc_handler) {
+ set_bit(MTIP_DD_FLAG_INIT_DONE_BIT, &dd->dd_flag);
return rv; /* service thread created for handling rebuild */
+ }
start_service_thread:
sprintf(thd_name, "mtip_svc_thd_%02d", index);
@@ -3228,6 +3336,9 @@ start_service_thread:
goto kthread_run_error;
}
+ if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
+ rv = wait_for_rebuild;
+
return rv;
kthread_run_error:
@@ -3274,10 +3385,12 @@ static int mtip_block_remove(struct driver_data *dd)
}
/* Clean up the sysfs attributes managed by the protocol layer. */
- kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
- if (kobj) {
- mtip_hw_sysfs_exit(dd, kobj);
- kobject_put(kobj);
+ if (test_bit(MTIP_DD_FLAG_INIT_DONE_BIT, &dd->dd_flag)) {
+ kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
+ if (kobj) {
+ mtip_hw_sysfs_exit(dd, kobj);
+ kobject_put(kobj);
+ }
}
/*
@@ -3361,8 +3474,6 @@ static int mtip_pci_probe(struct pci_dev *pdev,
return -ENOMEM;
}
- atomic_set(&dd->resumeflag, false);
-
/* Attach the private data to this PCI device. */
pci_set_drvdata(pdev, dd);
@@ -3419,7 +3530,8 @@ static int mtip_pci_probe(struct pci_dev *pdev,
* instance number.
*/
instance++;
-
+ if (rv != MTIP_FTL_REBUILD_MAGIC)
+ set_bit(MTIP_DD_FLAG_INIT_DONE_BIT, &dd->dd_flag);
goto done;
block_initialize_err:
@@ -3433,9 +3545,6 @@ iomap_err:
pci_set_drvdata(pdev, NULL);
return rv;
done:
- /* Set the atomic variable as 0 */
- atomic_set(&dd->drv_cleanup_done, false);
-
return rv;
}
@@ -3451,8 +3560,10 @@ static void mtip_pci_remove(struct pci_dev *pdev)
struct driver_data *dd = pci_get_drvdata(pdev);
int counter = 0;
+ set_bit(MTIP_DD_FLAG_REMOVE_PENDING_BIT, &dd->dd_flag);
+
if (mtip_check_surprise_removal(pdev)) {
- while (atomic_read(&dd->drv_cleanup_done) == false) {
+ while (!test_bit(MTIP_DD_FLAG_CLEANUP_BIT, &dd->dd_flag)) {
counter++;
msleep(20);
if (counter == 10) {
@@ -3490,7 +3601,7 @@ static int mtip_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
return -EFAULT;
}
- atomic_set(&dd->resumeflag, true);
+ set_bit(MTIP_DD_FLAG_RESUME_BIT, &dd->dd_flag);
/* Disable ports & interrupts then send standby immediate */
rv = mtip_block_suspend(dd);
@@ -3556,7 +3667,7 @@ static int mtip_pci_resume(struct pci_dev *pdev)
dev_err(&pdev->dev, "Unable to resume\n");
err:
- atomic_set(&dd->resumeflag, false);
+ clear_bit(MTIP_DD_FLAG_RESUME_BIT, &dd->dd_flag);
return rv;
}
diff --git a/drivers/block/mtip32xx/mtip32xx.h b/drivers/block/mtip32xx/mtip32xx.h
index e0554a8..f4e46cc 100644
--- a/drivers/block/mtip32xx/mtip32xx.h
+++ b/drivers/block/mtip32xx/mtip32xx.h
@@ -121,6 +121,12 @@
#define MTIP_FLAG_REBUILD_BIT 5
#define MTIP_FLAG_SVC_THD_SHOULD_STOP_BIT 8
+/* below are bit numbers in 'dd_flag' defined in driver_data */
+#define MTIP_DD_FLAG_REMOVE_PENDING_BIT 1
+#define MTIP_DD_FLAG_RESUME_BIT 2
+#define MTIP_DD_FLAG_CLEANUP_BIT 3
+#define MTIP_DD_FLAG_INIT_DONE_BIT 4
+
/* Register Frame Information Structure (FIS), host to device. */
struct host_to_dev_fis {
/*
@@ -404,13 +410,9 @@ struct driver_data {
unsigned slot_groups; /* number of slot groups the product supports */
- atomic_t drv_cleanup_done; /* Atomic variable for SRSI */
-
unsigned long index; /* Index to determine the disk name */
- unsigned int ftlrebuildflag; /* FTL rebuild flag */
-
- atomic_t resumeflag; /* Atomic variable to track suspend/resume */
+ unsigned long dd_flag; /* NOTE: use atomic bit operations on this */
struct task_struct *mtip_svc_handler; /* task_struct of svc thd */
};
--
1.7.1
--
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