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nest-open-source / nest-learning-thermostat / 5.7 / linux-imx-ul / refs/heads/master / . / drivers / block / skd_main.c
blob: 1e46eb2305c04a8e63e378befb95a905fdf01850 [file] [log] [blame] [edit]
/* Copyright 2012 STEC, Inc.
*
* This file is licensed under the terms of the 3-clause
* BSD License (http://opensource.org/licenses/BSD-3-Clause)
* or the GNU GPL-2.0 (http://www.gnu.org/licenses/gpl-2.0.html),
* at your option. Both licenses are also available in the LICENSE file
* distributed with this project. This file may not be copied, modified,
* or distributed except in accordance with those terms.
* Gordoni Waidhofer <gwaidhofer@stec-inc.com>
* Initial Driver Design!
* Thomas Swann <tswann@stec-inc.com>
* Interrupt handling.
* Ramprasad Chinthekindi <rchinthekindi@stec-inc.com>
* biomode implementation.
* Akhil Bhansali <abhansali@stec-inc.com>
* Added support for DISCARD / FLUSH and FUA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/compiler.h>
#include <linux/workqueue.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/hdreg.h>
#include <linux/dma-mapping.h>
#include <linux/completion.h>
#include <linux/scatterlist.h>
#include <linux/version.h>
#include <linux/err.h>
#include <linux/scatterlist.h>
#include <linux/aer.h>
#include <linux/ctype.h>
#include <linux/wait.h>
#include <linux/uio.h>
#include <scsi/scsi.h>
#include <scsi/sg.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <asm/unaligned.h>
#include "skd_s1120.h"
static int skd_dbg_level;
static int skd_isr_comp_limit = 4;
enum {
STEC_LINK_2_5GTS = 0,
STEC_LINK_5GTS = 1,
STEC_LINK_8GTS = 2,
STEC_LINK_UNKNOWN = 0xFF
};
enum {
SKD_FLUSH_INITIALIZER,
SKD_FLUSH_ZERO_SIZE_FIRST,
SKD_FLUSH_DATA_SECOND,
};
#define SKD_ASSERT(expr) \
do { \
if (unlikely(!(expr))) { \
pr_err("Assertion failed! %s,%s,%s,line=%d\n", \
# expr, __FILE__, __func__, __LINE__); \
} \
} while (0)
#define DRV_NAME "skd"
#define DRV_VERSION "2.2.1"
#define DRV_BUILD_ID "0260"
#define PFX DRV_NAME ": "
#define DRV_BIN_VERSION 0x100
#define DRV_VER_COMPL "2.2.1." DRV_BUILD_ID
MODULE_AUTHOR("bug-reports: support@stec-inc.com");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("STEC s1120 PCIe SSD block driver (b" DRV_BUILD_ID ")");
MODULE_VERSION(DRV_VERSION "-" DRV_BUILD_ID);
#define PCI_VENDOR_ID_STEC 0x1B39
#define PCI_DEVICE_ID_S1120 0x0001
#define SKD_FUA_NV (1 << 1)
#define SKD_MINORS_PER_DEVICE 16
#define SKD_MAX_QUEUE_DEPTH 200u
#define SKD_PAUSE_TIMEOUT (5 * 1000)
#define SKD_N_FITMSG_BYTES (512u)
#define SKD_N_SPECIAL_CONTEXT 32u
#define SKD_N_SPECIAL_FITMSG_BYTES (128u)
/* SG elements are 32 bytes, so we can make this 4096 and still be under the
* 128KB limit. That allows 4096*4K = 16M xfer size
*/
#define SKD_N_SG_PER_REQ_DEFAULT 256u
#define SKD_N_SG_PER_SPECIAL 256u
#define SKD_N_COMPLETION_ENTRY 256u
#define SKD_N_READ_CAP_BYTES (8u)
#define SKD_N_INTERNAL_BYTES (512u)
/* 5 bits of uniqifier, 0xF800 */
#define SKD_ID_INCR (0x400)
#define SKD_ID_TABLE_MASK (3u << 8u)
#define SKD_ID_RW_REQUEST (0u << 8u)
#define SKD_ID_INTERNAL (1u << 8u)
#define SKD_ID_SPECIAL_REQUEST (2u << 8u)
#define SKD_ID_FIT_MSG (3u << 8u)
#define SKD_ID_SLOT_MASK 0x00FFu
#define SKD_ID_SLOT_AND_TABLE_MASK 0x03FFu
#define SKD_N_TIMEOUT_SLOT 4u
#define SKD_TIMEOUT_SLOT_MASK 3u
#define SKD_N_MAX_SECTORS 2048u
#define SKD_MAX_RETRIES 2u
#define SKD_TIMER_SECONDS(seconds) (seconds)
#define SKD_TIMER_MINUTES(minutes) ((minutes) * (60))
#define INQ_STD_NBYTES 36
#define SKD_DISCARD_CDB_LENGTH 24
enum skd_drvr_state {
SKD_DRVR_STATE_LOAD,
SKD_DRVR_STATE_IDLE,
SKD_DRVR_STATE_BUSY,
SKD_DRVR_STATE_STARTING,
SKD_DRVR_STATE_ONLINE,
SKD_DRVR_STATE_PAUSING,
SKD_DRVR_STATE_PAUSED,
SKD_DRVR_STATE_DRAINING_TIMEOUT,
SKD_DRVR_STATE_RESTARTING,
SKD_DRVR_STATE_RESUMING,
SKD_DRVR_STATE_STOPPING,
SKD_DRVR_STATE_FAULT,
SKD_DRVR_STATE_DISAPPEARED,
SKD_DRVR_STATE_PROTOCOL_MISMATCH,
SKD_DRVR_STATE_BUSY_ERASE,
SKD_DRVR_STATE_BUSY_SANITIZE,
SKD_DRVR_STATE_BUSY_IMMINENT,
SKD_DRVR_STATE_WAIT_BOOT,
SKD_DRVR_STATE_SYNCING,
};
#define SKD_WAIT_BOOT_TIMO SKD_TIMER_SECONDS(90u)
#define SKD_STARTING_TIMO SKD_TIMER_SECONDS(8u)
#define SKD_RESTARTING_TIMO SKD_TIMER_MINUTES(4u)
#define SKD_DRAINING_TIMO SKD_TIMER_SECONDS(6u)
#define SKD_BUSY_TIMO SKD_TIMER_MINUTES(20u)
#define SKD_STARTED_BUSY_TIMO SKD_TIMER_SECONDS(60u)
#define SKD_START_WAIT_SECONDS 90u
enum skd_req_state {
SKD_REQ_STATE_IDLE,
SKD_REQ_STATE_SETUP,
SKD_REQ_STATE_BUSY,
SKD_REQ_STATE_COMPLETED,
SKD_REQ_STATE_TIMEOUT,
SKD_REQ_STATE_ABORTED,
};
enum skd_fit_msg_state {
SKD_MSG_STATE_IDLE,
SKD_MSG_STATE_BUSY,
};
enum skd_check_status_action {
SKD_CHECK_STATUS_REPORT_GOOD,
SKD_CHECK_STATUS_REPORT_SMART_ALERT,
SKD_CHECK_STATUS_REQUEUE_REQUEST,
SKD_CHECK_STATUS_REPORT_ERROR,
SKD_CHECK_STATUS_BUSY_IMMINENT,
};
struct skd_fitmsg_context {
enum skd_fit_msg_state state;
struct skd_fitmsg_context *next;
u32 id;
u16 outstanding;
u32 length;
u32 offset;
u8 *msg_buf;
dma_addr_t mb_dma_address;
};
struct skd_request_context {
enum skd_req_state state;
struct skd_request_context *next;
u16 id;
u32 fitmsg_id;
struct request *req;
u8 flush_cmd;
u8 discard_page;
u32 timeout_stamp;
u8 sg_data_dir;
struct scatterlist *sg;
u32 n_sg;
u32 sg_byte_count;
struct fit_sg_descriptor *sksg_list;
dma_addr_t sksg_dma_address;
struct fit_completion_entry_v1 completion;
struct fit_comp_error_info err_info;
};
#define SKD_DATA_DIR_HOST_TO_CARD 1
#define SKD_DATA_DIR_CARD_TO_HOST 2
#define SKD_DATA_DIR_NONE 3 /* especially for DISCARD requests. */
struct skd_special_context {
struct skd_request_context req;
u8 orphaned;
void *data_buf;
dma_addr_t db_dma_address;
u8 *msg_buf;
dma_addr_t mb_dma_address;
};
struct skd_sg_io {
fmode_t mode;
void __user *argp;
struct sg_io_hdr sg;
u8 cdb[16];
u32 dxfer_len;
u32 iovcnt;
struct sg_iovec *iov;
struct sg_iovec no_iov_iov;
struct skd_special_context *skspcl;
};
typedef enum skd_irq_type {
SKD_IRQ_LEGACY,
SKD_IRQ_MSI,
SKD_IRQ_MSIX
} skd_irq_type_t;
#define SKD_MAX_BARS 2
struct skd_device {
volatile void __iomem *mem_map[SKD_MAX_BARS];
resource_size_t mem_phys[SKD_MAX_BARS];
u32 mem_size[SKD_MAX_BARS];
skd_irq_type_t irq_type;
u32 msix_count;
struct skd_msix_entry *msix_entries;
struct pci_dev *pdev;
int pcie_error_reporting_is_enabled;
spinlock_t lock;
struct gendisk *disk;
struct request_queue *queue;
struct device *class_dev;
int gendisk_on;
int sync_done;
atomic_t device_count;
u32 devno;
u32 major;
char name[32];
char isr_name[30];
enum skd_drvr_state state;
u32 drive_state;
u32 in_flight;
u32 cur_max_queue_depth;
u32 queue_low_water_mark;
u32 dev_max_queue_depth;
u32 num_fitmsg_context;
u32 num_req_context;
u32 timeout_slot[SKD_N_TIMEOUT_SLOT];
u32 timeout_stamp;
struct skd_fitmsg_context *skmsg_free_list;
struct skd_fitmsg_context *skmsg_table;
struct skd_request_context *skreq_free_list;
struct skd_request_context *skreq_table;
struct skd_special_context *skspcl_free_list;
struct skd_special_context *skspcl_table;
struct skd_special_context internal_skspcl;
u32 read_cap_blocksize;
u32 read_cap_last_lba;
int read_cap_is_valid;
int inquiry_is_valid;
u8 inq_serial_num[13]; /*12 chars plus null term */
u8 id_str[80]; /* holds a composite name (pci + sernum) */
u8 skcomp_cycle;
u32 skcomp_ix;
struct fit_completion_entry_v1 *skcomp_table;
struct fit_comp_error_info *skerr_table;
dma_addr_t cq_dma_address;
wait_queue_head_t waitq;
struct timer_list timer;
u32 timer_countdown;
u32 timer_substate;
int n_special;
int sgs_per_request;
u32 last_mtd;
u32 proto_ver;
int dbg_level;
u32 connect_time_stamp;
int connect_retries;
#define SKD_MAX_CONNECT_RETRIES 16
u32 drive_jiffies;
u32 timo_slot;
struct work_struct completion_worker;
};
#define SKD_WRITEL(DEV, VAL, OFF) skd_reg_write32(DEV, VAL, OFF)
#define SKD_READL(DEV, OFF) skd_reg_read32(DEV, OFF)
#define SKD_WRITEQ(DEV, VAL, OFF) skd_reg_write64(DEV, VAL, OFF)
static inline u32 skd_reg_read32(struct skd_device *skdev, u32 offset)
{
u32 val;
if (likely(skdev->dbg_level < 2))
return readl(skdev->mem_map[1] + offset);
else {
barrier();
val = readl(skdev->mem_map[1] + offset);
barrier();
pr_debug("%s:%s:%d offset %x = %x\n",
skdev->name, __func__, __LINE__, offset, val);
return val;
}
}
static inline void skd_reg_write32(struct skd_device *skdev, u32 val,
u32 offset)
{
if (likely(skdev->dbg_level < 2)) {
writel(val, skdev->mem_map[1] + offset);
barrier();
} else {
barrier();
writel(val, skdev->mem_map[1] + offset);
barrier();
pr_debug("%s:%s:%d offset %x = %x\n",
skdev->name, __func__, __LINE__, offset, val);
}
}
static inline void skd_reg_write64(struct skd_device *skdev, u64 val,
u32 offset)
{
if (likely(skdev->dbg_level < 2)) {
writeq(val, skdev->mem_map[1] + offset);
barrier();
} else {
barrier();
writeq(val, skdev->mem_map[1] + offset);
barrier();
pr_debug("%s:%s:%d offset %x = %016llx\n",
skdev->name, __func__, __LINE__, offset, val);
}
}
#define SKD_IRQ_DEFAULT SKD_IRQ_MSI
static int skd_isr_type = SKD_IRQ_DEFAULT;
module_param(skd_isr_type, int, 0444);
MODULE_PARM_DESC(skd_isr_type, "Interrupt type capability."
" (0==legacy, 1==MSI, 2==MSI-X, default==1)");
#define SKD_MAX_REQ_PER_MSG_DEFAULT 1
static int skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT;
module_param(skd_max_req_per_msg, int, 0444);
MODULE_PARM_DESC(skd_max_req_per_msg,
"Maximum SCSI requests packed in a single message."
" (1-14, default==1)");
#define SKD_MAX_QUEUE_DEPTH_DEFAULT 64
#define SKD_MAX_QUEUE_DEPTH_DEFAULT_STR "64"
static int skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT;
module_param(skd_max_queue_depth, int, 0444);
MODULE_PARM_DESC(skd_max_queue_depth,
"Maximum SCSI requests issued to s1120."
" (1-200, default==" SKD_MAX_QUEUE_DEPTH_DEFAULT_STR ")");
static int skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT;
module_param(skd_sgs_per_request, int, 0444);
MODULE_PARM_DESC(skd_sgs_per_request,
"Maximum SG elements per block request."
" (1-4096, default==256)");
static int skd_max_pass_thru = SKD_N_SPECIAL_CONTEXT;
module_param(skd_max_pass_thru, int, 0444);
MODULE_PARM_DESC(skd_max_pass_thru,
"Maximum SCSI pass-thru at a time." " (1-50, default==32)");
module_param(skd_dbg_level, int, 0444);
MODULE_PARM_DESC(skd_dbg_level, "s1120 debug level (0,1,2)");
module_param(skd_isr_comp_limit, int, 0444);
MODULE_PARM_DESC(skd_isr_comp_limit, "s1120 isr comp limit (0=none) default=4");
/* Major device number dynamically assigned. */
static u32 skd_major;
static void skd_destruct(struct skd_device *skdev);
static const struct block_device_operations skd_blockdev_ops;
static void skd_send_fitmsg(struct skd_device *skdev,
struct skd_fitmsg_context *skmsg);
static void skd_send_special_fitmsg(struct skd_device *skdev,
struct skd_special_context *skspcl);
static void skd_request_fn(struct request_queue *rq);
static void skd_end_request(struct skd_device *skdev,
struct skd_request_context *skreq, int error);
static int skd_preop_sg_list(struct skd_device *skdev,
struct skd_request_context *skreq);
static void skd_postop_sg_list(struct skd_device *skdev,
struct skd_request_context *skreq);
static void skd_restart_device(struct skd_device *skdev);
static int skd_quiesce_dev(struct skd_device *skdev);
static int skd_unquiesce_dev(struct skd_device *skdev);
static void skd_release_special(struct skd_device *skdev,
struct skd_special_context *skspcl);
static void skd_disable_interrupts(struct skd_device *skdev);
static void skd_isr_fwstate(struct skd_device *skdev);
static void skd_recover_requests(struct skd_device *skdev, int requeue);
static void skd_soft_reset(struct skd_device *skdev);
static const char *skd_name(struct skd_device *skdev);
const char *skd_drive_state_to_str(int state);
const char *skd_skdev_state_to_str(enum skd_drvr_state state);
static void skd_log_skdev(struct skd_device *skdev, const char *event);
static void skd_log_skmsg(struct skd_device *skdev,
struct skd_fitmsg_context *skmsg, const char *event);
static void skd_log_skreq(struct skd_device *skdev,
struct skd_request_context *skreq, const char *event);
/*
*****************************************************************************
* READ/WRITE REQUESTS
*****************************************************************************
*/
static void skd_fail_all_pending(struct skd_device *skdev)
{
struct request_queue *q = skdev->queue;
struct request *req;
for (;; ) {
req = blk_peek_request(q);
if (req == NULL)
break;
blk_start_request(req);
__blk_end_request_all(req, -EIO);
}
}
static void
skd_prep_rw_cdb(struct skd_scsi_request *scsi_req,
int data_dir, unsigned lba,
unsigned count)
{
if (data_dir == READ)
scsi_req->cdb[0] = 0x28;
else
scsi_req->cdb[0] = 0x2a;
scsi_req->cdb[1] = 0;
scsi_req->cdb[2] = (lba & 0xff000000) >> 24;
scsi_req->cdb[3] = (lba & 0xff0000) >> 16;
scsi_req->cdb[4] = (lba & 0xff00) >> 8;
scsi_req->cdb[5] = (lba & 0xff);
scsi_req->cdb[6] = 0;
scsi_req->cdb[7] = (count & 0xff00) >> 8;
scsi_req->cdb[8] = count & 0xff;
scsi_req->cdb[9] = 0;
}
static void
skd_prep_zerosize_flush_cdb(struct skd_scsi_request *scsi_req,
struct skd_request_context *skreq)
{
skreq->flush_cmd = 1;
scsi_req->cdb[0] = 0x35;
scsi_req->cdb[1] = 0;
scsi_req->cdb[2] = 0;
scsi_req->cdb[3] = 0;
scsi_req->cdb[4] = 0;
scsi_req->cdb[5] = 0;
scsi_req->cdb[6] = 0;
scsi_req->cdb[7] = 0;
scsi_req->cdb[8] = 0;
scsi_req->cdb[9] = 0;
}
static void
skd_prep_discard_cdb(struct skd_scsi_request *scsi_req,
struct skd_request_context *skreq,
struct page *page,
u32 lba, u32 count)
{
char *buf;
unsigned long len;
struct request *req;
buf = page_address(page);
len = SKD_DISCARD_CDB_LENGTH;
scsi_req->cdb[0] = UNMAP;
scsi_req->cdb[8] = len;
put_unaligned_be16(6 + 16, &buf[0]);
put_unaligned_be16(16, &buf[2]);
put_unaligned_be64(lba, &buf[8]);
put_unaligned_be32(count, &buf[16]);
req = skreq->req;
blk_add_request_payload(req, page, len);
}
static void skd_request_fn_not_online(struct request_queue *q);
static void skd_request_fn(struct request_queue *q)
{
struct skd_device *skdev = q->queuedata;
struct skd_fitmsg_context *skmsg = NULL;
struct fit_msg_hdr *fmh = NULL;
struct skd_request_context *skreq;
struct request *req = NULL;
struct skd_scsi_request *scsi_req;
struct page *page;
unsigned long io_flags;
int error;
u32 lba;
u32 count;
int data_dir;
u32 be_lba;
u32 be_count;
u64 be_dmaa;
u64 cmdctxt;
u32 timo_slot;
void *cmd_ptr;
int flush, fua;
if (skdev->state != SKD_DRVR_STATE_ONLINE) {
skd_request_fn_not_online(q);
return;
}
if (blk_queue_stopped(skdev->queue)) {
if (skdev->skmsg_free_list == NULL ||
skdev->skreq_free_list == NULL ||
skdev->in_flight >= skdev->queue_low_water_mark)
/* There is still some kind of shortage */
return;
queue_flag_clear(QUEUE_FLAG_STOPPED, skdev->queue);
}
/*
* Stop conditions:
* - There are no more native requests
* - There are already the maximum number of requests in progress
* - There are no more skd_request_context entries
* - There are no more FIT msg buffers
*/
for (;; ) {
flush = fua = 0;
req = blk_peek_request(q);
/* Are there any native requests to start? */
if (req == NULL)
break;
lba = (u32)blk_rq_pos(req);
count = blk_rq_sectors(req);
data_dir = rq_data_dir(req);
io_flags = req->cmd_flags;
if (io_flags & REQ_FLUSH)
flush++;
if (io_flags & REQ_FUA)
fua++;
pr_debug("%s:%s:%d new req=%p lba=%u(0x%x) "
"count=%u(0x%x) dir=%d\n",
skdev->name, __func__, __LINE__,
req, lba, lba, count, count, data_dir);
/* At this point we know there is a request */
/* Are too many requets already in progress? */
if (skdev->in_flight >= skdev->cur_max_queue_depth) {
pr_debug("%s:%s:%d qdepth %d, limit %d\n",
skdev->name, __func__, __LINE__,
skdev->in_flight, skdev->cur_max_queue_depth);
break;
}
/* Is a skd_request_context available? */
skreq = skdev->skreq_free_list;
if (skreq == NULL) {
pr_debug("%s:%s:%d Out of req=%p\n",
skdev->name, __func__, __LINE__, q);
break;
}
SKD_ASSERT(skreq->state == SKD_REQ_STATE_IDLE);
SKD_ASSERT((skreq->id & SKD_ID_INCR) == 0);
/* Now we check to see if we can get a fit msg */
if (skmsg == NULL) {
if (skdev->skmsg_free_list == NULL) {
pr_debug("%s:%s:%d Out of msg\n",
skdev->name, __func__, __LINE__);
break;
}
}
skreq->flush_cmd = 0;
skreq->n_sg = 0;
skreq->sg_byte_count = 0;
skreq->discard_page = 0;
/*
* OK to now dequeue request from q.
*
* At this point we are comitted to either start or reject
* the native request. Note that skd_request_context is
* available but is still at the head of the free list.
*/
blk_start_request(req);
skreq->req = req;
skreq->fitmsg_id = 0;
/* Either a FIT msg is in progress or we have to start one. */
if (skmsg == NULL) {
/* Are there any FIT msg buffers available? */
skmsg = skdev->skmsg_free_list;
if (skmsg == NULL) {
pr_debug("%s:%s:%d Out of msg skdev=%p\n",
skdev->name, __func__, __LINE__,
skdev);
break;
}
SKD_ASSERT(skmsg->state == SKD_MSG_STATE_IDLE);
SKD_ASSERT((skmsg->id & SKD_ID_INCR) == 0);
skdev->skmsg_free_list = skmsg->next;
skmsg->state = SKD_MSG_STATE_BUSY;
skmsg->id += SKD_ID_INCR;
/* Initialize the FIT msg header */
fmh = (struct fit_msg_hdr *)skmsg->msg_buf;
memset(fmh, 0, sizeof(*fmh));
fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
skmsg->length = sizeof(*fmh);
}
skreq->fitmsg_id = skmsg->id;
/*
* Note that a FIT msg may have just been started
* but contains no SoFIT requests yet.
*/
/*
* Transcode the request, checking as we go. The outcome of
* the transcoding is represented by the error variable.
*/
cmd_ptr = &skmsg->msg_buf[skmsg->length];
memset(cmd_ptr, 0, 32);
be_lba = cpu_to_be32(lba);
be_count = cpu_to_be32(count);
be_dmaa = cpu_to_be64((u64)skreq->sksg_dma_address);
cmdctxt = skreq->id + SKD_ID_INCR;
scsi_req = cmd_ptr;
scsi_req->hdr.tag = cmdctxt;
scsi_req->hdr.sg_list_dma_address = be_dmaa;
if (data_dir == READ)
skreq->sg_data_dir = SKD_DATA_DIR_CARD_TO_HOST;
else
skreq->sg_data_dir = SKD_DATA_DIR_HOST_TO_CARD;
if (io_flags & REQ_DISCARD) {
page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
if (!page) {
pr_err("request_fn:Page allocation failed.\n");
skd_end_request(skdev, skreq, -ENOMEM);
break;
}
skreq->discard_page = 1;
req->completion_data = page;
skd_prep_discard_cdb(scsi_req, skreq, page, lba, count);
} else if (flush == SKD_FLUSH_ZERO_SIZE_FIRST) {
skd_prep_zerosize_flush_cdb(scsi_req, skreq);
SKD_ASSERT(skreq->flush_cmd == 1);
} else {
skd_prep_rw_cdb(scsi_req, data_dir, lba, count);
}
if (fua)
scsi_req->cdb[1] |= SKD_FUA_NV;
if (!req->bio)
goto skip_sg;
error = skd_preop_sg_list(skdev, skreq);
if (error != 0) {
/*
* Complete the native request with error.
* Note that the request context is still at the
* head of the free list, and that the SoFIT request
* was encoded into the FIT msg buffer but the FIT
* msg length has not been updated. In short, the
* only resource that has been allocated but might
* not be used is that the FIT msg could be empty.
*/
pr_debug("%s:%s:%d error Out\n",
skdev->name, __func__, __LINE__);
skd_end_request(skdev, skreq, error);
continue;
}
skip_sg:
scsi_req->hdr.sg_list_len_bytes =
cpu_to_be32(skreq->sg_byte_count);
/* Complete resource allocations. */
skdev->skreq_free_list = skreq->next;
skreq->state = SKD_REQ_STATE_BUSY;
skreq->id += SKD_ID_INCR;
skmsg->length += sizeof(struct skd_scsi_request);
fmh->num_protocol_cmds_coalesced++;
/*
* Update the active request counts.
* Capture the timeout timestamp.
*/
skreq->timeout_stamp = skdev->timeout_stamp;
timo_slot = skreq->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
skdev->timeout_slot[timo_slot]++;
skdev->in_flight++;
pr_debug("%s:%s:%d req=0x%x busy=%d\n",
skdev->name, __func__, __LINE__,
skreq->id, skdev->in_flight);
/*
* If the FIT msg buffer is full send it.
*/
if (skmsg->length >= SKD_N_FITMSG_BYTES ||
fmh->num_protocol_cmds_coalesced >= skd_max_req_per_msg) {
skd_send_fitmsg(skdev, skmsg);
skmsg = NULL;
fmh = NULL;
}
}
/*
* Is a FIT msg in progress? If it is empty put the buffer back
* on the free list. If it is non-empty send what we got.
* This minimizes latency when there are fewer requests than
* what fits in a FIT msg.
*/
if (skmsg != NULL) {
/* Bigger than just a FIT msg header? */
if (skmsg->length > sizeof(struct fit_msg_hdr)) {
pr_debug("%s:%s:%d sending msg=%p, len %d\n",
skdev->name, __func__, __LINE__,
skmsg, skmsg->length);
skd_send_fitmsg(skdev, skmsg);
} else {
/*
* The FIT msg is empty. It means we got started
* on the msg, but the requests were rejected.
*/
skmsg->state = SKD_MSG_STATE_IDLE;
skmsg->id += SKD_ID_INCR;
skmsg->next = skdev->skmsg_free_list;
skdev->skmsg_free_list = skmsg;
}
skmsg = NULL;
fmh = NULL;
}
/*
* If req is non-NULL it means there is something to do but
* we are out of a resource.
*/
if (req)
blk_stop_queue(skdev->queue);
}
static void skd_end_request(struct skd_device *skdev,
struct skd_request_context *skreq, int error)
{
struct request *req = skreq->req;
unsigned int io_flags = req->cmd_flags;
if ((io_flags & REQ_DISCARD) &&
(skreq->discard_page == 1)) {
pr_debug("%s:%s:%d, free the page!",
skdev->name, __func__, __LINE__);
__free_page(req->completion_data);
}
if (unlikely(error)) {
struct request *req = skreq->req;
char *cmd = (rq_data_dir(req) == READ) ? "read" : "write";
u32 lba = (u32)blk_rq_pos(req);
u32 count = blk_rq_sectors(req);
pr_err("(%s): Error cmd=%s sect=%u count=%u id=0x%x\n",
skd_name(skdev), cmd, lba, count, skreq->id);
} else
pr_debug("%s:%s:%d id=0x%x error=%d\n",
skdev->name, __func__, __LINE__, skreq->id, error);
__blk_end_request_all(skreq->req, error);
}
static int skd_preop_sg_list(struct skd_device *skdev,
struct skd_request_context *skreq)
{
struct request *req = skreq->req;
int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
struct scatterlist *sg = &skreq->sg[0];
int n_sg;
int i;
skreq->sg_byte_count = 0;
/* SKD_ASSERT(skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD ||
skreq->sg_data_dir == SKD_DATA_DIR_CARD_TO_HOST); */
n_sg = blk_rq_map_sg(skdev->queue, req, sg);
if (n_sg <= 0)
return -EINVAL;
/*
* Map scatterlist to PCI bus addresses.
* Note PCI might change the number of entries.
*/
n_sg = pci_map_sg(skdev->pdev, sg, n_sg, pci_dir);
if (n_sg <= 0)
return -EINVAL;
SKD_ASSERT(n_sg <= skdev->sgs_per_request);
skreq->n_sg = n_sg;
for (i = 0; i < n_sg; i++) {
struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
u32 cnt = sg_dma_len(&sg[i]);
uint64_t dma_addr = sg_dma_address(&sg[i]);
sgd->control = FIT_SGD_CONTROL_NOT_LAST;
sgd->byte_count = cnt;
skreq->sg_byte_count += cnt;
sgd->host_side_addr = dma_addr;
sgd->dev_side_addr = 0;
}
skreq->sksg_list[n_sg - 1].next_desc_ptr = 0LL;
skreq->sksg_list[n_sg - 1].control = FIT_SGD_CONTROL_LAST;
if (unlikely(skdev->dbg_level > 1)) {
pr_debug("%s:%s:%d skreq=%x sksg_list=%p sksg_dma=%llx\n",
skdev->name, __func__, __LINE__,
skreq->id, skreq->sksg_list, skreq->sksg_dma_address);
for (i = 0; i < n_sg; i++) {
struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
pr_debug("%s:%s:%d sg[%d] count=%u ctrl=0x%x "
"addr=0x%llx next=0x%llx\n",
skdev->name, __func__, __LINE__,
i, sgd->byte_count, sgd->control,
sgd->host_side_addr, sgd->next_desc_ptr);
}
}
return 0;
}
static void skd_postop_sg_list(struct skd_device *skdev,
struct skd_request_context *skreq)
{
int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
/*
* restore the next ptr for next IO request so we
* don't have to set it every time.
*/
skreq->sksg_list[skreq->n_sg - 1].next_desc_ptr =
skreq->sksg_dma_address +
((skreq->n_sg) * sizeof(struct fit_sg_descriptor));
pci_unmap_sg(skdev->pdev, &skreq->sg[0], skreq->n_sg, pci_dir);
}
static void skd_request_fn_not_online(struct request_queue *q)
{
struct skd_device *skdev = q->queuedata;
int error;
SKD_ASSERT(skdev->state != SKD_DRVR_STATE_ONLINE);
skd_log_skdev(skdev, "req_not_online");
switch (skdev->state) {
case SKD_DRVR_STATE_PAUSING:
case SKD_DRVR_STATE_PAUSED:
case SKD_DRVR_STATE_STARTING:
case SKD_DRVR_STATE_RESTARTING:
case SKD_DRVR_STATE_WAIT_BOOT:
/* In case of starting, we haven't started the queue,
* so we can't get here... but requests are
* possibly hanging out waiting for us because we
* reported the dev/skd0 already. They'll wait
* forever if connect doesn't complete.
* What to do??? delay dev/skd0 ??
*/
case SKD_DRVR_STATE_BUSY:
case SKD_DRVR_STATE_BUSY_IMMINENT:
case SKD_DRVR_STATE_BUSY_ERASE:
case SKD_DRVR_STATE_DRAINING_TIMEOUT:
return;
case SKD_DRVR_STATE_BUSY_SANITIZE:
case SKD_DRVR_STATE_STOPPING:
case SKD_DRVR_STATE_SYNCING:
case SKD_DRVR_STATE_FAULT:
case SKD_DRVR_STATE_DISAPPEARED:
default:
error = -EIO;
break;
}
/* If we get here, terminate all pending block requeusts
* with EIO and any scsi pass thru with appropriate sense
*/
skd_fail_all_pending(skdev);
}
/*
*****************************************************************************
* TIMER
*****************************************************************************
*/
static void skd_timer_tick_not_online(struct skd_device *skdev);
static void skd_timer_tick(ulong arg)
{
struct skd_device *skdev = (struct skd_device *)arg;
u32 timo_slot;
u32 overdue_timestamp;
unsigned long reqflags;
u32 state;
if (skdev->state == SKD_DRVR_STATE_FAULT)
/* The driver has declared fault, and we want it to
* stay that way until driver is reloaded.
*/
return;
spin_lock_irqsave(&skdev->lock, reqflags);
state = SKD_READL(skdev, FIT_STATUS);
state &= FIT_SR_DRIVE_STATE_MASK;
if (state != skdev->drive_state)
skd_isr_fwstate(skdev);
if (skdev->state != SKD_DRVR_STATE_ONLINE) {
skd_timer_tick_not_online(skdev);
goto timer_func_out;
}
skdev->timeout_stamp++;
timo_slot = skdev->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
/*
* All requests that happened during the previous use of
* this slot should be done by now. The previous use was
* over 7 seconds ago.
*/
if (skdev->timeout_slot[timo_slot] == 0)
goto timer_func_out;
/* Something is overdue */
overdue_timestamp = skdev->timeout_stamp - SKD_N_TIMEOUT_SLOT;
pr_debug("%s:%s:%d found %d timeouts, draining busy=%d\n",
skdev->name, __func__, __LINE__,
skdev->timeout_slot[timo_slot], skdev->in_flight);
pr_err("(%s): Overdue IOs (%d), busy %d\n",
skd_name(skdev), skdev->timeout_slot[timo_slot],
skdev->in_flight);
skdev->timer_countdown = SKD_DRAINING_TIMO;
skdev->state = SKD_DRVR_STATE_DRAINING_TIMEOUT;
skdev->timo_slot = timo_slot;
blk_stop_queue(skdev->queue);
timer_func_out:
mod_timer(&skdev->timer, (jiffies + HZ));
spin_unlock_irqrestore(&skdev->lock, reqflags);
}
static void skd_timer_tick_not_online(struct skd_device *skdev)
{
switch (skdev->state) {
case SKD_DRVR_STATE_IDLE:
case SKD_DRVR_STATE_LOAD:
break;
case SKD_DRVR_STATE_BUSY_SANITIZE:
pr_debug("%s:%s:%d drive busy sanitize[%x], driver[%x]\n",
skdev->name, __func__, __LINE__,
skdev->drive_state, skdev->state);
/* If we've been in sanitize for 3 seconds, we figure we're not
* going to get anymore completions, so recover requests now
*/
if (skdev->timer_countdown > 0) {
skdev->timer_countdown--;
return;
}
skd_recover_requests(skdev, 0);
break;
case SKD_DRVR_STATE_BUSY:
case SKD_DRVR_STATE_BUSY_IMMINENT:
case SKD_DRVR_STATE_BUSY_ERASE:
pr_debug("%s:%s:%d busy[%x], countdown=%d\n",
skdev->name, __func__, __LINE__,
skdev->state, skdev->timer_countdown);
if (skdev->timer_countdown > 0) {
skdev->timer_countdown--;
return;
}
pr_debug("%s:%s:%d busy[%x], timedout=%d, restarting device.",
skdev->name, __func__, __LINE__,
skdev->state, skdev->timer_countdown);
skd_restart_device(skdev);
break;
case SKD_DRVR_STATE_WAIT_BOOT:
case SKD_DRVR_STATE_STARTING:
if (skdev->timer_countdown > 0) {
skdev->timer_countdown--;
return;
}
/* For now, we fault the drive. Could attempt resets to
* revcover at some point. */
skdev->state = SKD_DRVR_STATE_FAULT;
pr_err("(%s): DriveFault Connect Timeout (%x)\n",
skd_name(skdev), skdev->drive_state);
/*start the queue so we can respond with error to requests */
/* wakeup anyone waiting for startup complete */
blk_start_queue(skdev->queue);
skdev->gendisk_on = -1;
wake_up_interruptible(&skdev->waitq);
break;
case SKD_DRVR_STATE_ONLINE:
/* shouldn't get here. */
break;
case SKD_DRVR_STATE_PAUSING:
case SKD_DRVR_STATE_PAUSED:
break;
case SKD_DRVR_STATE_DRAINING_TIMEOUT:
pr_debug("%s:%s:%d "
"draining busy [%d] tick[%d] qdb[%d] tmls[%d]\n",
skdev->name, __func__, __LINE__,
skdev->timo_slot,
skdev->timer_countdown,
skdev->in_flight,
skdev->timeout_slot[skdev->timo_slot]);
/* if the slot has cleared we can let the I/O continue */
if (skdev->timeout_slot[skdev->timo_slot] == 0) {
pr_debug("%s:%s:%d Slot drained, starting queue.\n",
skdev->name, __func__, __LINE__);
skdev->state = SKD_DRVR_STATE_ONLINE;
blk_start_queue(skdev->queue);
return;
}
if (skdev->timer_countdown > 0) {
skdev->timer_countdown--;
return;
}
skd_restart_device(skdev);
break;
case SKD_DRVR_STATE_RESTARTING:
if (skdev->timer_countdown > 0) {
skdev->timer_countdown--;
return;
}
/* For now, we fault the drive. Could attempt resets to
* revcover at some point. */
skdev->state = SKD_DRVR_STATE_FAULT;
pr_err("(%s): DriveFault Reconnect Timeout (%x)\n",
skd_name(skdev), skdev->drive_state);
/*
* Recovering does two things:
* 1. completes IO with error
* 2. reclaims dma resources
* When is it safe to recover requests?
* - if the drive state is faulted
* - if the state is still soft reset after out timeout
* - if the drive registers are dead (state = FF)
* If it is "unsafe", we still need to recover, so we will
* disable pci bus mastering and disable our interrupts.
*/
if ((skdev->drive_state == FIT_SR_DRIVE_SOFT_RESET) ||
(skdev->drive_state == FIT_SR_DRIVE_FAULT) ||
(skdev->drive_state == FIT_SR_DRIVE_STATE_MASK))
/* It never came out of soft reset. Try to
* recover the requests and then let them
* fail. This is to mitigate hung processes. */
skd_recover_requests(skdev, 0);
else {
pr_err("(%s): Disable BusMaster (%x)\n",
skd_name(skdev), skdev->drive_state);
pci_disable_device(skdev->pdev);
skd_disable_interrupts(skdev);
skd_recover_requests(skdev, 0);
}
/*start the queue so we can respond with error to requests */
/* wakeup anyone waiting for startup complete */
blk_start_queue(skdev->queue);
skdev->gendisk_on = -1;
wake_up_interruptible(&skdev->waitq);
break;
case SKD_DRVR_STATE_RESUMING:
case SKD_DRVR_STATE_STOPPING:
case SKD_DRVR_STATE_SYNCING:
case SKD_DRVR_STATE_FAULT:
case SKD_DRVR_STATE_DISAPPEARED:
default:
break;
}
}
static int skd_start_timer(struct skd_device *skdev)
{
int rc;
init_timer(&skdev->timer);
setup_timer(&skdev->timer, skd_timer_tick, (ulong)skdev);
rc = mod_timer(&skdev->timer, (jiffies + HZ));
if (rc)
pr_err("%s: failed to start timer %d\n",
__func__, rc);
return rc;
}
static void skd_kill_timer(struct skd_device *skdev)
{
del_timer_sync(&skdev->timer);
}
/*
*****************************************************************************
* IOCTL
*****************************************************************************
*/
static int skd_ioctl_sg_io(struct skd_device *skdev,
fmode_t mode, void __user *argp);
static int skd_sg_io_get_and_check_args(struct skd_device *skdev,
struct skd_sg_io *sksgio);
static int skd_sg_io_obtain_skspcl(struct skd_device *skdev,
struct skd_sg_io *sksgio);
static int skd_sg_io_prep_buffering(struct skd_device *skdev,
struct skd_sg_io *sksgio);
static int skd_sg_io_copy_buffer(struct skd_device *skdev,
struct skd_sg_io *sksgio, int dxfer_dir);
static int skd_sg_io_send_fitmsg(struct skd_device *skdev,
struct skd_sg_io *sksgio);
static int skd_sg_io_await(struct skd_device *skdev, struct skd_sg_io *sksgio);
static int skd_sg_io_release_skspcl(struct skd_device *skdev,
struct skd_sg_io *sksgio);
static int skd_sg_io_put_status(struct skd_device *skdev,
struct skd_sg_io *sksgio);
static void skd_complete_special(struct skd_device *skdev,
volatile struct fit_completion_entry_v1
*skcomp,
volatile struct fit_comp_error_info *skerr,
struct skd_special_context *skspcl);
static int skd_bdev_ioctl(struct block_device *bdev, fmode_t mode,
uint cmd_in, ulong arg)
{
int rc = 0;
struct gendisk *disk = bdev->bd_disk;
struct skd_device *skdev = disk->private_data;
void __user *p = (void *)arg;
pr_debug("%s:%s:%d %s: CMD[%s] ioctl mode 0x%x, cmd 0x%x arg %0lx\n",
skdev->name, __func__, __LINE__,
disk->disk_name, current->comm, mode, cmd_in, arg);
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
switch (cmd_in) {
case SG_SET_TIMEOUT:
case SG_GET_TIMEOUT:
case SG_GET_VERSION_NUM:
rc = scsi_cmd_ioctl(disk->queue, disk, mode, cmd_in, p);
break;
case SG_IO:
rc = skd_ioctl_sg_io(skdev, mode, p);
break;
default:
rc = -ENOTTY;
break;
}
pr_debug("%s:%s:%d %s: completion rc %d\n",
skdev->name, __func__, __LINE__, disk->disk_name, rc);
return rc;
}
static int skd_ioctl_sg_io(struct skd_device *skdev, fmode_t mode,
void __user *argp)
{
int rc;
struct skd_sg_io sksgio;
memset(&sksgio, 0, sizeof(sksgio));
sksgio.mode = mode;
sksgio.argp = argp;
sksgio.iov = &sksgio.no_iov_iov;
switch (skdev->state) {
case SKD_DRVR_STATE_ONLINE:
case SKD_DRVR_STATE_BUSY_IMMINENT:
break;
default:
pr_debug("%s:%s:%d drive not online\n",
skdev->name, __func__, __LINE__);
rc = -ENXIO;
goto out;
}
rc = skd_sg_io_get_and_check_args(skdev, &sksgio);
if (rc)
goto out;
rc = skd_sg_io_obtain_skspcl(skdev, &sksgio);
if (rc)
goto out;
rc = skd_sg_io_prep_buffering(skdev, &sksgio);
if (rc)
goto out;
rc = skd_sg_io_copy_buffer(skdev, &sksgio, SG_DXFER_TO_DEV);
if (rc)
goto out;
rc = skd_sg_io_send_fitmsg(skdev, &sksgio);
if (rc)
goto out;
rc = skd_sg_io_await(skdev, &sksgio);
if (rc)
goto out;
rc = skd_sg_io_copy_buffer(skdev, &sksgio, SG_DXFER_FROM_DEV);
if (rc)
goto out;
rc = skd_sg_io_put_status(skdev, &sksgio);
if (rc)
goto out;
rc = 0;
out:
skd_sg_io_release_skspcl(skdev, &sksgio);
if (sksgio.iov != NULL && sksgio.iov != &sksgio.no_iov_iov)
kfree(sksgio.iov);
return rc;
}
static int skd_sg_io_get_and_check_args(struct skd_device *skdev,
struct skd_sg_io *sksgio)
{
struct sg_io_hdr *sgp = &sksgio->sg;
int i, acc;
if (!access_ok(VERIFY_WRITE, sksgio->argp, sizeof(sg_io_hdr_t))) {
pr_debug("%s:%s:%d access sg failed %p\n",
skdev->name, __func__, __LINE__, sksgio->argp);
return -EFAULT;
}
if (__copy_from_user(sgp, sksgio->argp, sizeof(sg_io_hdr_t))) {
pr_debug("%s:%s:%d copy_from_user sg failed %p\n",
skdev->name, __func__, __LINE__, sksgio->argp);
return -EFAULT;
}
if (sgp->interface_id != SG_INTERFACE_ID_ORIG) {
pr_debug("%s:%s:%d interface_id invalid 0x%x\n",
skdev->name, __func__, __LINE__, sgp->interface_id);
return -EINVAL;
}
if (sgp->cmd_len > sizeof(sksgio->cdb)) {
pr_debug("%s:%s:%d cmd_len invalid %d\n",
skdev->name, __func__, __LINE__, sgp->cmd_len);
return -EINVAL;
}
if (sgp->iovec_count > 256) {
pr_debug("%s:%s:%d iovec_count invalid %d\n",
skdev->name, __func__, __LINE__, sgp->iovec_count);
return -EINVAL;
}
if (sgp->dxfer_len > (PAGE_SIZE * SKD_N_SG_PER_SPECIAL)) {
pr_debug("%s:%s:%d dxfer_len invalid %d\n",
skdev->name, __func__, __LINE__, sgp->dxfer_len);
return -EINVAL;
}
switch (sgp->dxfer_direction) {
case SG_DXFER_NONE:
acc = -1;
break;
case SG_DXFER_TO_DEV:
acc = VERIFY_READ;
break;
case SG_DXFER_FROM_DEV:
case SG_DXFER_TO_FROM_DEV:
acc = VERIFY_WRITE;
break;
default:
pr_debug("%s:%s:%d dxfer_dir invalid %d\n",
skdev->name, __func__, __LINE__, sgp->dxfer_direction);
return -EINVAL;
}
if (copy_from_user(sksgio->cdb, sgp->cmdp, sgp->cmd_len)) {
pr_debug("%s:%s:%d copy_from_user cmdp failed %p\n",
skdev->name, __func__, __LINE__, sgp->cmdp);
return -EFAULT;
}
if (sgp->mx_sb_len != 0) {
if (!access_ok(VERIFY_WRITE, sgp->sbp, sgp->mx_sb_len)) {
pr_debug("%s:%s:%d access sbp failed %p\n",
skdev->name, __func__, __LINE__, sgp->sbp);
return -EFAULT;
}
}
if (sgp->iovec_count == 0) {
sksgio->iov[0].iov_base = sgp->dxferp;
sksgio->iov[0].iov_len = sgp->dxfer_len;
sksgio->iovcnt = 1;
sksgio->dxfer_len = sgp->dxfer_len;
} else {
struct sg_iovec *iov;
uint nbytes = sizeof(*iov) * sgp->iovec_count;
size_t iov_data_len;
iov = kmalloc(nbytes, GFP_KERNEL);
if (iov == NULL) {
pr_debug("%s:%s:%d alloc iovec failed %d\n",
skdev->name, __func__, __LINE__,
sgp->iovec_count);
return -ENOMEM;
}
sksgio->iov = iov;
sksgio->iovcnt = sgp->iovec_count;
if (copy_from_user(iov, sgp->dxferp, nbytes)) {
pr_debug("%s:%s:%d copy_from_user iovec failed %p\n",
skdev->name, __func__, __LINE__, sgp->dxferp);
return -EFAULT;
}
/*
* Sum up the vecs, making sure they don't overflow
*/
iov_data_len = 0;
for (i = 0; i < sgp->iovec_count; i++) {
if (iov_data_len + iov[i].iov_len < iov_data_len)
return -EINVAL;
iov_data_len += iov[i].iov_len;
}
/* SG_IO howto says that the shorter of the two wins */
if (sgp->dxfer_len < iov_data_len) {
sksgio->iovcnt = iov_shorten((struct iovec *)iov,
sgp->iovec_count,
sgp->dxfer_len);
sksgio->dxfer_len = sgp->dxfer_len;
} else
sksgio->dxfer_len = iov_data_len;
}
if (sgp->dxfer_direction != SG_DXFER_NONE) {
struct sg_iovec *iov = sksgio->iov;
for (i = 0; i < sksgio->iovcnt; i++, iov++) {
if (!access_ok(acc, iov->iov_base, iov->iov_len)) {
pr_debug("%s:%s:%d access data failed %p/%d\n",
skdev->name, __func__, __LINE__,
iov->iov_base, (int)iov->iov_len);
return -EFAULT;
}
}
}
return 0;
}
static int skd_sg_io_obtain_skspcl(struct skd_device *skdev,
struct skd_sg_io *sksgio)
{
struct skd_special_context *skspcl = NULL;
int rc;
for (;;) {
ulong flags;
spin_lock_irqsave(&skdev->lock, flags);
skspcl = skdev->skspcl_free_list;
if (skspcl != NULL) {
skdev->skspcl_free_list =
(struct skd_special_context *)skspcl->req.next;
skspcl->req.id += SKD_ID_INCR;
skspcl->req.state = SKD_REQ_STATE_SETUP;
skspcl->orphaned = 0;
skspcl->req.n_sg = 0;
}
spin_unlock_irqrestore(&skdev->lock, flags);
if (skspcl != NULL) {
rc = 0;
break;
}
pr_debug("%s:%s:%d blocking\n",
skdev->name, __func__, __LINE__);
rc = wait_event_interruptible_timeout(
skdev->waitq,
(skdev->skspcl_free_list != NULL),
msecs_to_jiffies(sksgio->sg.timeout));
pr_debug("%s:%s:%d unblocking, rc=%d\n",
skdev->name, __func__, __LINE__, rc);
if (rc <= 0) {
if (rc == 0)
rc = -ETIMEDOUT;
else
rc = -EINTR;
break;
}
/*
* If we get here rc > 0 meaning the timeout to
* wait_event_interruptible_timeout() had time left, hence the
* sought event -- non-empty free list -- happened.
* Retry the allocation.
*/
}
sksgio->skspcl = skspcl;
return rc;
}
static int skd_skreq_prep_buffering(struct skd_device *skdev,
struct skd_request_context *skreq,
u32 dxfer_len)
{
u32 resid = dxfer_len;
/*
* The DMA engine must have aligned addresses and byte counts.
*/
resid += (-resid) & 3;
skreq->sg_byte_count = resid;
skreq->n_sg = 0;
while (resid > 0) {
u32 nbytes = PAGE_SIZE;
u32 ix = skreq->n_sg;
struct scatterlist *sg = &skreq->sg[ix];
struct fit_sg_descriptor *sksg = &skreq->sksg_list[ix];
struct page *page;
if (nbytes > resid)
nbytes = resid;
page = alloc_page(GFP_KERNEL);
if (page == NULL)
return -ENOMEM;
sg_set_page(sg, page, nbytes, 0);
/* TODO: This should be going through a pci_???()
* routine to do proper mapping. */
sksg->control = FIT_SGD_CONTROL_NOT_LAST;
sksg->byte_count = nbytes;
sksg->host_side_addr = sg_phys(sg);
sksg->dev_side_addr = 0;
sksg->next_desc_ptr = skreq->sksg_dma_address +
(ix + 1) * sizeof(*sksg);
skreq->n_sg++;
resid -= nbytes;
}
if (skreq->n_sg > 0) {
u32 ix = skreq->n_sg - 1;
struct fit_sg_descriptor *sksg = &skreq->sksg_list[ix];
sksg->control = FIT_SGD_CONTROL_LAST;
sksg->next_desc_ptr = 0;
}
if (unlikely(skdev->dbg_level > 1)) {
u32 i;
pr_debug("%s:%s:%d skreq=%x sksg_list=%p sksg_dma=%llx\n",
skdev->name, __func__, __LINE__,
skreq->id, skreq->sksg_list, skreq->sksg_dma_address);
for (i = 0; i < skreq->n_sg; i++) {
struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
pr_debug("%s:%s:%d sg[%d] count=%u ctrl=0x%x "
"addr=0x%llx next=0x%llx\n",
skdev->name, __func__, __LINE__,
i, sgd->byte_count, sgd->control,
sgd->host_side_addr, sgd->next_desc_ptr);
}
}
return 0;
}
static int skd_sg_io_prep_buffering(struct skd_device *skdev,
struct skd_sg_io *sksgio)
{
struct skd_special_context *skspcl = sksgio->skspcl;
struct skd_request_context *skreq = &skspcl->req;
u32 dxfer_len = sksgio->dxfer_len;
int rc;
rc = skd_skreq_prep_buffering(skdev, skreq, dxfer_len);
/*
* Eventually, errors or not, skd_release_special() is called
* to recover allocations including partial allocations.
*/
return rc;
}
static int skd_sg_io_copy_buffer(struct skd_device *skdev,
struct skd_sg_io *sksgio, int dxfer_dir)
{
struct skd_special_context *skspcl = sksgio->skspcl;
u32 iov_ix = 0;
struct sg_iovec curiov;
u32 sksg_ix = 0;
u8 *bufp = NULL;
u32 buf_len = 0;
u32 resid = sksgio->dxfer_len;
int rc;
curiov.iov_len = 0;
curiov.iov_base = NULL;
if (dxfer_dir != sksgio->sg.dxfer_direction) {
if (dxfer_dir != SG_DXFER_TO_DEV ||
sksgio->sg.dxfer_direction != SG_DXFER_TO_FROM_DEV)
return 0;
}
while (resid > 0) {
u32 nbytes = PAGE_SIZE;
if (curiov.iov_len == 0) {
curiov = sksgio->iov[iov_ix++];
continue;
}
if (buf_len == 0) {
struct page *page;
page = sg_page(&skspcl->req.sg[sksg_ix++]);
bufp = page_address(page);
buf_len = PAGE_SIZE;
}
nbytes = min_t(u32, nbytes, resid);
nbytes = min_t(u32, nbytes, curiov.iov_len);
nbytes = min_t(u32, nbytes, buf_len);
if (dxfer_dir == SG_DXFER_TO_DEV)
rc = __copy_from_user(bufp, curiov.iov_base, nbytes);
else
rc = __copy_to_user(curiov.iov_base, bufp, nbytes);
if (rc)
return -EFAULT;
resid -= nbytes;
curiov.iov_len -= nbytes;
curiov.iov_base += nbytes;
buf_len -= nbytes;
}
return 0;
}
static int skd_sg_io_send_fitmsg(struct skd_device *skdev,
struct skd_sg_io *sksgio)
{
struct skd_special_context *skspcl = sksgio->skspcl;
struct fit_msg_hdr *fmh = (struct fit_msg_hdr *)skspcl->msg_buf;
struct skd_scsi_request *scsi_req = (struct skd_scsi_request *)&fmh[1];
memset(skspcl->msg_buf, 0, SKD_N_SPECIAL_FITMSG_BYTES);
/* Initialize the FIT msg header */
fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
fmh->num_protocol_cmds_coalesced = 1;
/* Initialize the SCSI request */
if (sksgio->sg.dxfer_direction != SG_DXFER_NONE)
scsi_req->hdr.sg_list_dma_address =
cpu_to_be64(skspcl->req.sksg_dma_address);
scsi_req->hdr.tag = skspcl->req.id;
scsi_req->hdr.sg_list_len_bytes =
cpu_to_be32(skspcl->req.sg_byte_count);
memcpy(scsi_req->cdb, sksgio->cdb, sizeof(scsi_req->cdb));
skspcl->req.state = SKD_REQ_STATE_BUSY;
skd_send_special_fitmsg(skdev, skspcl);
return 0;
}
static int skd_sg_io_await(struct skd_device *skdev, struct skd_sg_io *sksgio)
{
unsigned long flags;
int rc;
rc = wait_event_interruptible_timeout(skdev->waitq,
(sksgio->skspcl->req.state !=
SKD_REQ_STATE_BUSY),
msecs_to_jiffies(sksgio->sg.
timeout));
spin_lock_irqsave(&skdev->lock, flags);
if (sksgio->skspcl->req.state == SKD_REQ_STATE_ABORTED) {
pr_debug("%s:%s:%d skspcl %p aborted\n",
skdev->name, __func__, __LINE__, sksgio->skspcl);
/* Build check cond, sense and let command finish. */
/* For a timeout, we must fabricate completion and sense
* data to complete the command */
sksgio->skspcl->req.completion.status =
SAM_STAT_CHECK_CONDITION;
memset(&sksgio->skspcl->req.err_info, 0,
sizeof(sksgio->skspcl->req.err_info));
sksgio->skspcl->req.err_info.type = 0x70;
sksgio->skspcl->req.err_info.key = ABORTED_COMMAND;
sksgio->skspcl->req.err_info.code = 0x44;
sksgio->skspcl->req.err_info.qual = 0;
rc = 0;
} else if (sksgio->skspcl->req.state != SKD_REQ_STATE_BUSY)
/* No longer on the adapter. We finish. */
rc = 0;
else {
/* Something's gone wrong. Still busy. Timeout or
* user interrupted (control-C). Mark as an orphan
* so it will be disposed when completed. */
sksgio->skspcl->orphaned = 1;
sksgio->skspcl = NULL;
if (rc == 0) {
pr_debug("%s:%s:%d timed out %p (%u ms)\n",
skdev->name, __func__, __LINE__,
sksgio, sksgio->sg.timeout);
rc = -ETIMEDOUT;
} else {
pr_debug("%s:%s:%d cntlc %p\n",
skdev->name, __func__, __LINE__, sksgio);
rc = -EINTR;
}
}
spin_unlock_irqrestore(&skdev->lock, flags);
return rc;
}
static int skd_sg_io_put_status(struct skd_device *skdev,
struct skd_sg_io *sksgio)
{
struct sg_io_hdr *sgp = &sksgio->sg;
struct skd_special_context *skspcl = sksgio->skspcl;
int resid = 0;
u32 nb = be32_to_cpu(skspcl->req.completion.num_returned_bytes);
sgp->status = skspcl->req.completion.status;
resid = sksgio->dxfer_len - nb;
sgp->masked_status = sgp->status & STATUS_MASK;
sgp->msg_status = 0;
sgp->host_status = 0;
sgp->driver_status = 0;
sgp->resid = resid;
if (sgp->masked_status || sgp->host_status || sgp->driver_status)
sgp->info |= SG_INFO_CHECK;
pr_debug("%s:%s:%d status %x masked %x resid 0x%x\n",
skdev->name, __func__, __LINE__,
sgp->status, sgp->masked_status, sgp->resid);
if (sgp->masked_status == SAM_STAT_CHECK_CONDITION) {
if (sgp->mx_sb_len > 0) {
struct fit_comp_error_info *ei = &skspcl->req.err_info;
u32 nbytes = sizeof(*ei);
nbytes = min_t(u32, nbytes, sgp->mx_sb_len);
sgp->sb_len_wr = nbytes;
if (__copy_to_user(sgp->sbp, ei, nbytes)) {
pr_debug("%s:%s:%d copy_to_user sense failed %p\n",
skdev->name, __func__, __LINE__,
sgp->sbp);
return -EFAULT;
}
}
}
if (__copy_to_user(sksgio->argp, sgp, sizeof(sg_io_hdr_t))) {
pr_debug("%s:%s:%d copy_to_user sg failed %p\n",
skdev->name, __func__, __LINE__, sksgio->argp);
return -EFAULT;
}
return 0;
}
static int skd_sg_io_release_skspcl(struct skd_device *skdev,
struct skd_sg_io *sksgio)
{
struct skd_special_context *skspcl = sksgio->skspcl;
if (skspcl != NULL) {
ulong flags;
sksgio->skspcl = NULL;
spin_lock_irqsave(&skdev->lock, flags);
skd_release_special(skdev, skspcl);
spin_unlock_irqrestore(&skdev->lock, flags);
}
return 0;
}
/*
*****************************************************************************
* INTERNAL REQUESTS -- generated by driver itself
*****************************************************************************
*/
static int skd_format_internal_skspcl(struct skd_device *skdev)
{
struct skd_special_context *skspcl = &skdev->internal_skspcl;
struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0];
struct fit_msg_hdr *fmh;
uint64_t dma_address;
struct skd_scsi_request *scsi;
fmh = (struct fit_msg_hdr *)&skspcl->msg_buf[0];
fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
fmh->num_protocol_cmds_coalesced = 1;
scsi = (struct skd_scsi_request *)&skspcl->msg_buf[64];
memset(scsi, 0, sizeof(*scsi));
dma_address = skspcl->req.sksg_dma_address;
scsi->hdr.sg_list_dma_address = cpu_to_be64(dma_address);
sgd->control = FIT_SGD_CONTROL_LAST;
sgd->byte_count = 0;
sgd->host_side_addr = skspcl->db_dma_address;
sgd->dev_side_addr = 0;
sgd->next_desc_ptr = 0LL;
return 1;
}
#define WR_BUF_SIZE SKD_N_INTERNAL_BYTES
static void skd_send_internal_skspcl(struct skd_device *skdev,
struct skd_special_context *skspcl,
u8 opcode)
{
struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0];
struct skd_scsi_request *scsi;
unsigned char *buf = skspcl->data_buf;
int i;
if (skspcl->req.state != SKD_REQ_STATE_IDLE)
/*
* A refresh is already in progress.
* Just wait for it to finish.
*/
return;
SKD_ASSERT((skspcl->req.id & SKD_ID_INCR) == 0);
skspcl->req.state = SKD_REQ_STATE_BUSY;
skspcl->req.id += SKD_ID_INCR;
scsi = (struct skd_scsi_request *)&skspcl->msg_buf[64];
scsi->hdr.tag = skspcl->req.id;
memset(scsi->cdb, 0, sizeof(scsi->cdb));
switch (opcode) {
case TEST_UNIT_READY:
scsi->cdb[0] = TEST_UNIT_READY;
sgd->byte_count = 0;
scsi->hdr.sg_list_len_bytes = 0;
break;
case READ_CAPACITY:
scsi->cdb[0] = READ_CAPACITY;
sgd->byte_count = SKD_N_READ_CAP_BYTES;
scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
break;
case INQUIRY:
scsi->cdb[0] = INQUIRY;
scsi->cdb[1] = 0x01; /* evpd */
scsi->cdb[2] = 0x80; /* serial number page */
scsi->cdb[4] = 0x10;
sgd->byte_count = 16;
scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
break;
case SYNCHRONIZE_CACHE:
scsi->cdb[0] = SYNCHRONIZE_CACHE;
sgd->byte_count = 0;
scsi->hdr.sg_list_len_bytes = 0;
break;
case WRITE_BUFFER:
scsi->cdb[0] = WRITE_BUFFER;
scsi->cdb[1] = 0x02;
scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8;
scsi->cdb[8] = WR_BUF_SIZE & 0xFF;
sgd->byte_count = WR_BUF_SIZE;
scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
/* fill incrementing byte pattern */
for (i = 0; i < sgd->byte_count; i++)
buf[i] = i & 0xFF;
break;
case READ_BUFFER:
scsi->cdb[0] = READ_BUFFER;
scsi->cdb[1] = 0x02;
scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8;
scsi->cdb[8] = WR_BUF_SIZE & 0xFF;
sgd->byte_count = WR_BUF_SIZE;
scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
memset(skspcl->data_buf, 0, sgd->byte_count);
break;
default:
SKD_ASSERT("Don't know what to send");
return;
}
skd_send_special_fitmsg(skdev, skspcl);
}
static void skd_refresh_device_data(struct skd_device *skdev)
{
struct skd_special_context *skspcl = &skdev->internal_skspcl;
skd_send_internal_skspcl(skdev, skspcl, TEST_UNIT_READY);
}
static int skd_chk_read_buf(struct skd_device *skdev,
struct skd_special_context *skspcl)
{
unsigned char *buf = skspcl->data_buf;
int i;
/* check for incrementing byte pattern */
for (i = 0; i < WR_BUF_SIZE; i++)
if (buf[i] != (i & 0xFF))
return 1;
return 0;
}
static void skd_log_check_status(struct skd_device *skdev, u8 status, u8 key,
u8 code, u8 qual, u8 fruc)
{
/* If the check condition is of special interest, log a message */
if ((status == SAM_STAT_CHECK_CONDITION) && (key == 0x02)
&& (code == 0x04) && (qual == 0x06)) {
pr_err("(%s): *** LOST_WRITE_DATA ERROR *** key/asc/"
"ascq/fruc %02x/%02x/%02x/%02x\n",
skd_name(skdev), key, code, qual, fruc);
}
}
static void skd_complete_internal(struct skd_device *skdev,
volatile struct fit_completion_entry_v1
*skcomp,
volatile struct fit_comp_error_info *skerr,
struct skd_special_context *skspcl)
{
u8 *buf = skspcl->data_buf;
u8 status;
int i;
struct skd_scsi_request *scsi =
(struct skd_scsi_request *)&skspcl->msg_buf[64];
SKD_ASSERT(skspcl == &skdev->internal_skspcl);
pr_debug("%s:%s:%d complete internal %x\n",
skdev->name, __func__, __LINE__, scsi->cdb[0]);
skspcl->req.completion = *skcomp;
skspcl->req.state = SKD_REQ_STATE_IDLE;
skspcl->req.id += SKD_ID_INCR;
status = skspcl->req.completion.status;
skd_log_check_status(skdev, status, skerr->key, skerr->code,
skerr->qual, skerr->fruc);
switch (scsi->cdb[0]) {
case TEST_UNIT_READY:
if (status == SAM_STAT_GOOD)
skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER);
else if ((status == SAM_STAT_CHECK_CONDITION) &&
(skerr->key == MEDIUM_ERROR))
skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER);
else {
if (skdev->state == SKD_DRVR_STATE_STOPPING) {
pr_debug("%s:%s:%d TUR failed, don't send anymore state 0x%x\n",
skdev->name, __func__, __LINE__,
skdev->state);
return;
}
pr_debug("%s:%s:%d **** TUR failed, retry skerr\n",
skdev->name, __func__, __LINE__);
skd_send_internal_skspcl(skdev, skspcl, 0x00);
}
break;
case WRITE_BUFFER:
if (status == SAM_STAT_GOOD)
skd_send_internal_skspcl(skdev, skspcl, READ_BUFFER);
else {
if (skdev->state == SKD_DRVR_STATE_STOPPING) {
pr_debug("%s:%s:%d write buffer failed, don't send anymore state 0x%x\n",
skdev->name, __func__, __LINE__,
skdev->state);
return;
}
pr_debug("%s:%s:%d **** write buffer failed, retry skerr\n",
skdev->name, __func__, __LINE__);
skd_send_internal_skspcl(skdev, skspcl, 0x00);
}
break;
case READ_BUFFER:
if (status == SAM_STAT_GOOD) {
if (skd_chk_read_buf(skdev, skspcl) == 0)
skd_send_internal_skspcl(skdev, skspcl,
READ_CAPACITY);
else {
pr_err(
"(%s):*** W/R Buffer mismatch %d ***\n",
skd_name(skdev), skdev->connect_retries);
if (skdev->connect_retries <
SKD_MAX_CONNECT_RETRIES) {
skdev->connect_retries++;
skd_soft_reset(skdev);
} else {
pr_err(
"(%s): W/R Buffer Connect Error\n",
skd_name(skdev));
return;
}
}
} else {
if (skdev->state == SKD_DRVR_STATE_STOPPING) {
pr_debug("%s:%s:%d "
"read buffer failed, don't send anymore state 0x%x\n",
skdev->name, __func__, __LINE__,
skdev->state);
return;
}
pr_debug("%s:%s:%d "
"**** read buffer failed, retry skerr\n",
skdev->name, __func__, __LINE__);
skd_send_internal_skspcl(skdev, skspcl, 0x00);
}
break;
case READ_CAPACITY:
skdev->read_cap_is_valid = 0;
if (status == SAM_STAT_GOOD) {
skdev->read_cap_last_lba =
(buf[0] << 24) | (buf[1] << 16) |
(buf[2] << 8) | buf[3];
skdev->read_cap_blocksize =
(buf[4] << 24) | (buf[5] << 16) |
(buf[6] << 8) | buf[7];
pr_debug("%s:%s:%d last lba %d, bs %d\n",
skdev->name, __func__, __LINE__,
skdev->read_cap_last_lba,
skdev->read_cap_blocksize);
set_capacity(skdev->disk, skdev->read_cap_last_lba + 1);
skdev->read_cap_is_valid = 1;
skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
} else if ((status == SAM_STAT_CHECK_CONDITION) &&
(skerr->key == MEDIUM_ERROR)) {
skdev->read_cap_last_lba = ~0;
set_capacity(skdev->disk, skdev->read_cap_last_lba + 1);
pr_debug("%s:%s:%d "
"**** MEDIUM ERROR caused READCAP to fail, ignore failure and continue to inquiry\n",
skdev->name, __func__, __LINE__);
skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
} else {
pr_debug("%s:%s:%d **** READCAP failed, retry TUR\n",
skdev->name, __func__, __LINE__);
skd_send_internal_skspcl(skdev, skspcl,
TEST_UNIT_READY);
}
break;
case INQUIRY:
skdev->inquiry_is_valid = 0;
if (status == SAM_STAT_GOOD) {
skdev->inquiry_is_valid = 1;
for (i = 0; i < 12; i++)
skdev->inq_serial_num[i] = buf[i + 4];
skdev->inq_serial_num[12] = 0;
}
if (skd_unquiesce_dev(skdev) < 0)
pr_debug("%s:%s:%d **** failed, to ONLINE device\n",
skdev->name, __func__, __LINE__);
/* connection is complete */
skdev->connect_retries = 0;
break;
case SYNCHRONIZE_CACHE:
if (status == SAM_STAT_GOOD)
skdev->sync_done = 1;
else
skdev->sync_done = -1;
wake_up_interruptible(&skdev->waitq);
break;
default:
SKD_ASSERT("we didn't send this");
}
}
/*
*****************************************************************************
* FIT MESSAGES
*****************************************************************************
*/
static void skd_send_fitmsg(struct skd_device *skdev,
struct skd_fitmsg_context *skmsg)
{
u64 qcmd;
struct fit_msg_hdr *fmh;
pr_debug("%s:%s:%d dma address 0x%llx, busy=%d\n",
skdev->name, __func__, __LINE__,
skmsg->mb_dma_address, skdev->in_flight);
pr_debug("%s:%s:%d msg_buf 0x%p, offset %x\n",
skdev->name, __func__, __LINE__,
skmsg->msg_buf, skmsg->offset);
qcmd = skmsg->mb_dma_address;
qcmd |= FIT_QCMD_QID_NORMAL;
fmh = (struct fit_msg_hdr *)skmsg->msg_buf;
skmsg->outstanding = fmh->num_protocol_cmds_coalesced;
if (unlikely(skdev->dbg_level > 1)) {
u8 *bp = (u8 *)skmsg->msg_buf;
int i;
for (i = 0; i < skmsg->length; i += 8) {
pr_debug("%s:%s:%d msg[%2d] %02x %02x %02x %02x "
"%02x %02x %02x %02x\n",
skdev->name, __func__, __LINE__,
i, bp[i + 0], bp[i + 1], bp[i + 2],
bp[i + 3], bp[i + 4], bp[i + 5],
bp[i + 6], bp[i + 7]);
if (i == 0)
i = 64 - 8;
}
}
if (skmsg->length > 256)
qcmd |= FIT_QCMD_MSGSIZE_512;
else if (skmsg->length > 128)
qcmd |= FIT_QCMD_MSGSIZE_256;
else if (skmsg->length > 64)
qcmd |= FIT_QCMD_MSGSIZE_128;
else
/*
* This makes no sense because the FIT msg header is
* 64 bytes. If the msg is only 64 bytes long it has
* no payload.
*/
qcmd |= FIT_QCMD_MSGSIZE_64;
SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
}
static void skd_send_special_fitmsg(struct skd_device *skdev,
struct skd_special_context *skspcl)
{
u64 qcmd;
if (unlikely(skdev->dbg_level > 1)) {
u8 *bp = (u8 *)skspcl->msg_buf;
int i;
for (i = 0; i < SKD_N_SPECIAL_FITMSG_BYTES; i += 8) {
pr_debug("%s:%s:%d spcl[%2d] %02x %02x %02x %02x "
"%02x %02x %02x %02x\n",
skdev->name, __func__, __LINE__, i,
bp[i + 0], bp[i + 1], bp[i + 2], bp[i + 3],
bp[i + 4], bp[i + 5], bp[i + 6], bp[i + 7]);
if (i == 0)
i = 64 - 8;
}
pr_debug("%s:%s:%d skspcl=%p id=%04x sksg_list=%p sksg_dma=%llx\n",
skdev->name, __func__, __LINE__,
skspcl, skspcl->req.id, skspcl->req.sksg_list,
skspcl->req.sksg_dma_address);
for (i = 0; i < skspcl->req.n_sg; i++) {
struct fit_sg_descriptor *sgd =
&skspcl->req.sksg_list[i];
pr_debug("%s:%s:%d sg[%d] count=%u ctrl=0x%x "
"addr=0x%llx next=0x%llx\n",
skdev->name, __func__, __LINE__,
i, sgd->byte_count, sgd->control,
sgd->host_side_addr, sgd->next_desc_ptr);
}
}
/*
* Special FIT msgs are always 128 bytes: a 64-byte FIT hdr
* and one 64-byte SSDI command.
*/
qcmd = skspcl->mb_dma_address;
qcmd |= FIT_QCMD_QID_NORMAL + FIT_QCMD_MSGSIZE_128;
SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
}
/*
*****************************************************************************
* COMPLETION QUEUE
*****************************************************************************
*/
static void skd_complete_other(struct skd_device *skdev,
volatile struct fit_completion_entry_v1 *skcomp,
volatile struct fit_comp_error_info *skerr);
struct sns_info {
u8 type;
u8 stat;
u8 key;
u8 asc;
u8 ascq;
u8 mask;
enum skd_check_status_action action;
};
static struct sns_info skd_chkstat_table[] = {
/* Good */
{ 0x70, 0x02, RECOVERED_ERROR, 0, 0, 0x1c,
SKD_CHECK_STATUS_REPORT_GOOD },
/* Smart alerts */
{ 0x70, 0x02, NO_SENSE, 0x0B, 0x00, 0x1E, /* warnings */
SKD_CHECK_STATUS_REPORT_SMART_ALERT },
{ 0x70, 0x02, NO_SENSE, 0x5D, 0x00, 0x1E, /* thresholds */
SKD_CHECK_STATUS_REPORT_SMART_ALERT },
{ 0x70, 0x02, RECOVERED_ERROR, 0x0B, 0x01, 0x1F, /* temperature over trigger */
SKD_CHECK_STATUS_REPORT_SMART_ALERT },
/* Retry (with limits) */
{ 0x70, 0x02, 0x0B, 0, 0, 0x1C, /* This one is for DMA ERROR */
SKD_CHECK_STATUS_REQUEUE_REQUEST },
{ 0x70, 0x02, 0x06, 0x0B, 0x00, 0x1E, /* warnings */
SKD_CHECK_STATUS_REQUEUE_REQUEST },
{ 0x70, 0x02, 0x06, 0x5D, 0x00, 0x1E, /* thresholds */
SKD_CHECK_STATUS_REQUEUE_REQUEST },
{ 0x70, 0x02, 0x06, 0x80, 0x30, 0x1F, /* backup power */
SKD_CHECK_STATUS_REQUEUE_REQUEST },
/* Busy (or about to be) */
{ 0x70, 0x02, 0x06, 0x3f, 0x01, 0x1F, /* fw changed */
SKD_CHECK_STATUS_BUSY_IMMINENT },
};
/*
* Look up status and sense data to decide how to handle the error
* from the device.
* mask says which fields must match e.g., mask=0x18 means check
* type and stat, ignore key, asc, ascq.
*/
static enum skd_check_status_action
skd_check_status(struct skd_device *skdev,
u8 cmp_status, volatile struct fit_comp_error_info *skerr)
{
int i, n;
pr_err("(%s): key/asc/ascq/fruc %02x/%02x/%02x/%02x\n",
skd_name(skdev), skerr->key, skerr->code, skerr->qual,
skerr->fruc);
pr_debug("%s:%s:%d stat: t=%02x stat=%02x k=%02x c=%02x q=%02x fruc=%02x\n",
skdev->name, __func__, __LINE__, skerr->type, cmp_status,
skerr->key, skerr->code, skerr->qual, skerr->fruc);
/* Does the info match an entry in the good category? */
n = sizeof(skd_chkstat_table) / sizeof(skd_chkstat_table[0]);
for (i = 0; i < n; i++) {
struct sns_info *sns = &skd_chkstat_table[i];
if (sns->mask & 0x10)
if (skerr->type != sns->type)
continue;
if (sns->mask & 0x08)
if (cmp_status != sns->stat)
continue;
if (sns->mask & 0x04)
if (skerr->key != sns->key)
continue;
if (sns->mask & 0x02)
if (skerr->code != sns->asc)
continue;
if (sns->mask & 0x01)
if (skerr->qual != sns->ascq)
continue;
if (sns->action == SKD_CHECK_STATUS_REPORT_SMART_ALERT) {
pr_err("(%s): SMART Alert: sense key/asc/ascq "
"%02x/%02x/%02x\n",
skd_name(skdev), skerr->key,
skerr->code, skerr->qual);
}
return sns->action;
}
/* No other match, so nonzero status means error,
* zero status means good
*/
if (cmp_status) {
pr_debug("%s:%s:%d status check: error\n",
skdev->name, __func__, __LINE__);
return SKD_CHECK_STATUS_REPORT_ERROR;
}
pr_debug("%s:%s:%d status check good default\n",
skdev->name, __func__, __LINE__);
return SKD_CHECK_STATUS_REPORT_GOOD;
}
static void skd_resolve_req_exception(struct skd_device *skdev,
struct skd_request_context *skreq)
{
u8 cmp_status = skreq->completion.status;
switch (skd_check_status(skdev, cmp_status, &skreq->err_info)) {
case SKD_CHECK_STATUS_REPORT_GOOD:
case SKD_CHECK_STATUS_REPORT_SMART_ALERT:
skd_end_request(skdev, skreq, 0);
break;
case SKD_CHECK_STATUS_BUSY_IMMINENT:
skd_log_skreq(skdev, skreq, "retry(busy)");
blk_requeue_request(skdev->queue, skreq->req);
pr_info("(%s) drive BUSY imminent\n", skd_name(skdev));
skdev->state = SKD_DRVR_STATE_BUSY_IMMINENT;
skdev->timer_countdown = SKD_TIMER_MINUTES(20);
skd_quiesce_dev(skdev);
break;
case SKD_CHECK_STATUS_REQUEUE_REQUEST:
if ((unsigned long) ++skreq->req->special < SKD_MAX_RETRIES) {
skd_log_skreq(skdev, skreq, "retry");
blk_requeue_request(skdev->queue, skreq->req);
break;
}
/* fall through to report error */
case SKD_CHECK_STATUS_REPORT_ERROR:
default:
skd_end_request(skdev, skreq, -EIO);
break;
}
}
/* assume spinlock is already held */
static void skd_release_skreq(struct skd_device *skdev,
struct skd_request_context *skreq)
{
u32 msg_slot;
struct skd_fitmsg_context *skmsg;
u32 timo_slot;
/*
* Reclaim the FIT msg buffer if this is
* the first of the requests it carried to
* be completed. The FIT msg buffer used to
* send this request cannot be reused until
* we are sure the s1120 card has copied
* it to its memory. The FIT msg might have
* contained several requests. As soon as
* any of them are completed we know that
* the entire FIT msg was transferred.
* Only the first completed request will
* match the FIT msg buffer id. The FIT
* msg buffer id is immediately updated.
* When subsequent requests complete the FIT
* msg buffer id won't match, so we know
* quite cheaply that it is already done.
*/
msg_slot = skreq->fitmsg_id & SKD_ID_SLOT_MASK;
SKD_ASSERT(msg_slot < skdev->num_fitmsg_context);
skmsg = &skdev->skmsg_table[msg_slot];
if (skmsg->id == skreq->fitmsg_id) {
SKD_ASSERT(skmsg->state == SKD_MSG_STATE_BUSY);
SKD_ASSERT(skmsg->outstanding > 0);
skmsg->outstanding--;
if (skmsg->outstanding == 0) {
skmsg->state = SKD_MSG_STATE_IDLE;
skmsg->id += SKD_ID_INCR;
skmsg->next = skdev->skmsg_free_list;
skdev->skmsg_free_list = skmsg;
}
}
/*
* Decrease the number of active requests.
* Also decrements the count in the timeout slot.
*/
SKD_ASSERT(skdev->in_flight > 0);
skdev->in_flight -= 1;
timo_slot = skreq->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
SKD_ASSERT(skdev->timeout_slot[timo_slot] > 0);
skdev->timeout_slot[timo_slot] -= 1;
/*
* Reset backpointer
*/
skreq->req = NULL;
/*
* Reclaim the skd_request_context
*/
skreq->state = SKD_REQ_STATE_IDLE;
skreq->id += SKD_ID_INCR;
skreq->next = skdev->skreq_free_list;
skdev->skreq_free_list = skreq;
}
#define DRIVER_INQ_EVPD_PAGE_CODE 0xDA
static void skd_do_inq_page_00(struct skd_device *skdev,
volatile struct fit_completion_entry_v1 *skcomp,
volatile struct fit_comp_error_info *skerr,
uint8_t *cdb, uint8_t *buf)
{
uint16_t insert_pt, max_bytes, drive_pages, drive_bytes, new_size;
/* Caller requested "supported pages". The driver needs to insert
* its page.
*/
pr_debug("%s:%s:%d skd_do_driver_inquiry: modify supported pages.\n",
skdev->name, __func__, __LINE__);
/* If the device rejected the request because the CDB was
* improperly formed, then just leave.
*/
if (skcomp->status == SAM_STAT_CHECK_CONDITION &&
skerr->key == ILLEGAL_REQUEST && skerr->code == 0x24)
return;
/* Get the amount of space the caller allocated */
max_bytes = (cdb[3] << 8) | cdb[4];
/* Get the number of pages actually returned by the device */
drive_pages = (buf[2] << 8) | buf[3];
drive_bytes = drive_pages + 4;
new_size = drive_pages + 1;
/* Supported pages must be in numerical order, so find where
* the driver page needs to be inserted into the list of
* pages returned by the device.
*/
for (insert_pt = 4; insert_pt < drive_bytes; insert_pt++) {
if (buf[insert_pt] == DRIVER_INQ_EVPD_PAGE_CODE)
return; /* Device using this page code. abort */
else if (buf[insert_pt] > DRIVER_INQ_EVPD_PAGE_CODE)
break;
}
if (insert_pt < max_bytes) {
uint16_t u;
/* Shift everything up one byte to make room. */
for (u = new_size + 3; u > insert_pt; u--)
buf[u] = buf[u - 1];
buf[insert_pt] = DRIVER_INQ_EVPD_PAGE_CODE;
/* SCSI byte order increment of num_returned_bytes by 1 */
skcomp->num_returned_bytes =
be32_to_cpu(skcomp->num_returned_bytes) + 1;
skcomp->num_returned_bytes =
be32_to_cpu(skcomp->num_returned_bytes);
}
/* update page length field to reflect the driver's page too */
buf[2] = (uint8_t)((new_size >> 8) & 0xFF);
buf[3] = (uint8_t)((new_size >> 0) & 0xFF);
}
static void skd_get_link_info(struct pci_dev *pdev, u8 *speed, u8 *width)
{
int pcie_reg;
u16 pci_bus_speed;
u8 pci_lanes;
pcie_reg = pci_find_capability(pdev, PCI_CAP_ID_EXP);
if (pcie_reg) {
u16 linksta;
pci_read_config_word(pdev, pcie_reg + PCI_EXP_LNKSTA, &linksta);
pci_bus_speed = linksta & 0xF;
pci_lanes = (linksta & 0x3F0) >> 4;
} else {
*speed = STEC_LINK_UNKNOWN;
*width = 0xFF;
return;
}
switch (pci_bus_speed) {
case 1:
*speed = STEC_LINK_2_5GTS;
break;
case 2:
*speed = STEC_LINK_5GTS;
break;
case 3:
*speed = STEC_LINK_8GTS;
break;
default:
*speed = STEC_LINK_UNKNOWN;
break;
}
if (pci_lanes <= 0x20)
*width = pci_lanes;
else
*width = 0xFF;
}
static void skd_do_inq_page_da(struct skd_device *skdev,
volatile struct fit_completion_entry_v1 *skcomp,
volatile struct fit_comp_error_info *skerr,
uint8_t *cdb, uint8_t *buf)
{
struct pci_dev *pdev = skdev->pdev;
unsigned max_bytes;
struct driver_inquiry_data inq;
u16 val;
pr_debug("%s:%s:%d skd_do_driver_inquiry: return driver page\n",
skdev->name, __func__, __LINE__);
memset(&inq, 0, sizeof(inq));
inq.page_code = DRIVER_INQ_EVPD_PAGE_CODE;
skd_get_link_info(pdev, &inq.pcie_link_speed, &inq.pcie_link_lanes);
inq.pcie_bus_number = cpu_to_be16(pdev->bus->number);
inq.pcie_device_number = PCI_SLOT(pdev->devfn);
inq.pcie_function_number = PCI_FUNC(pdev->devfn);
pci_read_config_word(pdev, PCI_VENDOR_ID, &val);
inq.pcie_vendor_id = cpu_to_be16(val);
pci_read_config_word(pdev, PCI_DEVICE_ID, &val);
inq.pcie_device_id = cpu_to_be16(val);
pci_read_config_word(pdev, PCI_SUBSYSTEM_VENDOR_ID, &val);
inq.pcie_subsystem_vendor_id = cpu_to_be16(val);
pci_read_config_word(pdev, PCI_SUBSYSTEM_ID, &val);
inq.pcie_subsystem_device_id = cpu_to_be16(val);
/* Driver version, fixed lenth, padded with spaces on the right */
inq.driver_version_length = sizeof(inq.driver_version);
memset(&inq.driver_version, ' ', sizeof(inq.driver_version));
memcpy(inq.driver_version, DRV_VER_COMPL,
min(sizeof(inq.driver_version), strlen(DRV_VER_COMPL)));
inq.page_length = cpu_to_be16((sizeof(inq) - 4));
/* Clear the error set by the device */
skcomp->status = SAM_STAT_GOOD;
memset((void *)skerr, 0, sizeof(*skerr));
/* copy response into output buffer */
max_bytes = (cdb[3] << 8) | cdb[4];
memcpy(buf, &inq, min_t(unsigned, max_bytes, sizeof(inq)));
skcomp->num_returned_bytes =
be32_to_cpu(min_t(uint16_t, max_bytes, sizeof(inq)));
}
static void skd_do_driver_inq(struct skd_device *skdev,
volatile struct fit_completion_entry_v1 *skcomp,
volatile struct fit_comp_error_info *skerr,
uint8_t *cdb, uint8_t *buf)
{
if (!buf)
return;
else if (cdb[0] != INQUIRY)
return; /* Not an INQUIRY */
else if ((cdb[1] & 1) == 0)
return; /* EVPD not set */
else if (cdb[2] == 0)
/* Need to add driver's page to supported pages list */
skd_do_inq_page_00(skdev, skcomp, skerr, cdb, buf);
else if (cdb[2] == DRIVER_INQ_EVPD_PAGE_CODE)
/* Caller requested driver's page */
skd_do_inq_page_da(skdev, skcomp, skerr, cdb, buf);
}
static unsigned char *skd_sg_1st_page_ptr(struct scatterlist *sg)
{
if (!sg)
return NULL;
if (!sg_page(sg))
return NULL;
return sg_virt(sg);
}
static void skd_process_scsi_inq(struct skd_device *skdev,
volatile struct fit_completion_entry_v1
*skcomp,
volatile struct fit_comp_error_info *skerr,
struct skd_special_context *skspcl)
{
uint8_t *buf;
struct fit_msg_hdr *fmh = (struct fit_msg_hdr *)skspcl->msg_buf;
struct skd_scsi_request *scsi_req = (struct skd_scsi_request *)&fmh[1];
dma_sync_sg_for_cpu(skdev->class_dev, skspcl->req.sg, skspcl->req.n_sg,
skspcl->req.sg_data_dir);
buf = skd_sg_1st_page_ptr(skspcl->req.sg);
if (buf)
skd_do_driver_inq(skdev, skcomp, skerr, scsi_req->cdb, buf);
}
static int skd_isr_completion_posted(struct skd_device *skdev,
int limit, int *enqueued)
{
volatile struct fit_completion_entry_v1 *skcmp = NULL;
volatile struct fit_comp_error_info *skerr;
u16 req_id;
u32 req_slot;
struct skd_request_context *skreq;
u16 cmp_cntxt = 0;
u8 cmp_status = 0;
u8 cmp_cycle = 0;
u32 cmp_bytes = 0;
int rc = 0;
int processed = 0;
for (;; ) {
SKD_ASSERT(skdev->skcomp_ix < SKD_N_COMPLETION_ENTRY);
skcmp = &skdev->skcomp_table[skdev->skcomp_ix];
cmp_cycle = skcmp->cycle;
cmp_cntxt = skcmp->tag;
cmp_status = skcmp->status;
cmp_bytes = be32_to_cpu(skcmp->num_returned_bytes);
skerr = &skdev->skerr_table[skdev->skcomp_ix];
pr_debug("%s:%s:%d "
"cycle=%d ix=%d got cycle=%d cmdctxt=0x%x stat=%d "
"busy=%d rbytes=0x%x proto=%d\n",
skdev->name, __func__, __LINE__, skdev->skcomp_cycle,
skdev->skcomp_ix, cmp_cycle, cmp_cntxt, cmp_status,
skdev->in_flight, cmp_bytes, skdev->proto_ver);
if (cmp_cycle != skdev->skcomp_cycle) {
pr_debug("%s:%s:%d end of completions\n",
skdev->name, __func__, __LINE__);
break;
}
/*
* Update the completion queue head index and possibly
* the completion cycle count. 8-bit wrap-around.
*/
skdev->skcomp_ix++;
if (skdev->skcomp_ix >= SKD_N_COMPLETION_ENTRY) {
skdev->skcomp_ix = 0;
skdev->skcomp_cycle++;
}
/*
* The command context is a unique 32-bit ID. The low order
* bits help locate the request. The request is usually a
* r/w request (see skd_start() above) or a special request.
*/
req_id = cmp_cntxt;
req_slot = req_id & SKD_ID_SLOT_AND_TABLE_MASK;
/* Is this other than a r/w request? */
if (req_slot >= skdev->num_req_context) {
/*
* This is not a completion for a r/w request.
*/
skd_complete_other(skdev, skcmp, skerr);
continue;
}
skreq = &skdev->skreq_table[req_slot];
/*
* Make sure the request ID for the slot matches.
*/
if (skreq->id != req_id) {
pr_debug("%s:%s:%d mismatch comp_id=0x%x req_id=0x%x\n",
skdev->name, __func__, __LINE__,
req_id, skreq->id);
{
u16 new_id = cmp_cntxt;
pr_err("(%s): Completion mismatch "
"comp_id=0x%04x skreq=0x%04x new=0x%04x\n",
skd_name(skdev), req_id,
skreq->id, new_id);
continue;
}
}
SKD_ASSERT(skreq->state == SKD_REQ_STATE_BUSY);
if (skreq->state == SKD_REQ_STATE_ABORTED) {
pr_debug("%s:%s:%d reclaim req %p id=%04x\n",
skdev->name, __func__, __LINE__,
skreq, skreq->id);
/* a previously timed out command can
* now be cleaned up */
skd_release_skreq(skdev, skreq);
continue;
}
skreq->completion = *skcmp;
if (unlikely(cmp_status == SAM_STAT_CHECK_CONDITION)) {
skreq->err_info = *skerr;
skd_log_check_status(skdev, cmp_status, skerr->key,
skerr->code, skerr->qual,
skerr->fruc);
}
/* Release DMA resources for the request. */
if (skreq->n_sg > 0)
skd_postop_sg_list(skdev, skreq);
if (!skreq->req) {
pr_debug("%s:%s:%d NULL backptr skdreq %p, "
"req=0x%x req_id=0x%x\n",
skdev->name, __func__, __LINE__,
skreq, skreq->id, req_id);
} else {
/*
* Capture the outcome and post it back to the
* native request.
*/
if (likely(cmp_status == SAM_STAT_GOOD))
skd_end_request(skdev, skreq, 0);
else
skd_resolve_req_exception(skdev, skreq);
}
/*
* Release the skreq, its FIT msg (if one), timeout slot,
* and queue depth.
*/
skd_release_skreq(skdev, skreq);
/* skd_isr_comp_limit equal zero means no limit */
if (limit) {
if (++processed >= limit) {
rc = 1;
break;
}
}
}
if ((skdev->state == SKD_DRVR_STATE_PAUSING)
&& (skdev->in_flight) == 0) {
skdev->state = SKD_DRVR_STATE_PAUSED;
wake_up_interruptible(&skdev->waitq);
}
return rc;
}
static void skd_complete_other(struct skd_device *skdev,
volatile struct fit_completion_entry_v1 *skcomp,
volatile struct fit_comp_error_info *skerr)
{
u32 req_id = 0;
u32 req_table;
u32 req_slot;
struct skd_special_context *skspcl;
req_id = skcomp->tag;
req_table = req_id & SKD_ID_TABLE_MASK;
req_slot = req_id & SKD_ID_SLOT_MASK;
pr_debug("%s:%s:%d table=0x%x id=0x%x slot=%d\n",
skdev->name, __func__, __LINE__,
req_table, req_id, req_slot);
/*
* Based on the request id, determine how to dispatch this completion.
* This swich/case is finding the good cases and forwarding the
* completion entry. Errors are reported below the switch.
*/
switch (req_table) {
case SKD_ID_RW_REQUEST:
/*
* The caller, skd_completion_posted_isr() above,
* handles r/w requests. The only way we get here
* is if the req_slot is out of bounds.
*/
break;
case SKD_ID_SPECIAL_REQUEST:
/*
* Make sure the req_slot is in bounds and that the id
* matches.
*/
if (req_slot < skdev->n_special) {
skspcl = &skdev->skspcl_table[req_slot];
if (skspcl->req.id == req_id &&
skspcl->req.state == SKD_REQ_STATE_BUSY) {
skd_complete_special(skdev,
skcomp, skerr, skspcl);
return;
}
}
break;
case SKD_ID_INTERNAL:
if (req_slot == 0) {
skspcl = &skdev->internal_skspcl;
if (skspcl->req.id == req_id &&
skspcl->req.state == SKD_REQ_STATE_BUSY) {
skd_complete_internal(skdev,
skcomp, skerr, skspcl);
return;
}
}
break;
case SKD_ID_FIT_MSG:
/*
* These id's should never appear in a completion record.
*/
break;
default:
/*
* These id's should never appear anywhere;
*/
break;
}
/*
* If we get here it is a bad or stale id.
*/
}
static void skd_complete_special(struct skd_device *skdev,
volatile struct fit_completion_entry_v1
*skcomp,
volatile struct fit_comp_error_info *skerr,
struct skd_special_context *skspcl)
{
pr_debug("%s:%s:%d completing special request %p\n",
skdev->name, __func__, __LINE__, skspcl);
if (skspcl->orphaned) {
/* Discard orphaned request */
/* ?: Can this release directly or does it need
* to use a worker? */
pr_debug("%s:%s:%d release orphaned %p\n",
skdev->name, __func__, __LINE__, skspcl);
skd_release_special(skdev, skspcl);
return;
}
skd_process_scsi_inq(skdev, skcomp, skerr, skspcl);
skspcl->req.state = SKD_REQ_STATE_COMPLETED;
skspcl->req.completion = *skcomp;
skspcl->req.err_info = *skerr;
skd_log_check_status(skdev, skspcl->req.completion.status, skerr->key,
skerr->code, skerr->qual, skerr->fruc);
wake_up_interruptible(&skdev->waitq);
}
/* assume spinlock is already held */
static void skd_release_special(struct skd_device *skdev,
struct skd_special_context *skspcl)
{
int i, was_depleted;
for (i = 0; i < skspcl->req.n_sg; i++) {
struct page *page = sg_page(&skspcl->req.sg[i]);
__free_page(page);
}
was_depleted = (skdev->skspcl_free_list == NULL);
skspcl->req.state = SKD_REQ_STATE_IDLE;
skspcl->req.id += SKD_ID_INCR;
skspcl->req.next =
(struct skd_request_context *)skdev->skspcl_free_list;
skdev->skspcl_free_list = (struct skd_special_context *)skspcl;
if (was_depleted) {
pr_debug("%s:%s:%d skspcl was depleted\n",
skdev->name, __func__, __LINE__);
/* Free list was depleted. Their might be waiters. */
wake_up_interruptible(&skdev->waitq);
}
}
static void skd_reset_skcomp(struct skd_device *skdev)
{
u32 nbytes;
struct fit_completion_entry_v1 *skcomp;
nbytes = sizeof(*skcomp) * SKD_N_COMPLETION_ENTRY;
nbytes += sizeof(struct fit_comp_error_info) * SKD_N_COMPLETION_ENTRY;
memset(skdev->skcomp_table, 0, nbytes);
skdev->skcomp_ix = 0;
skdev->skcomp_cycle = 1;
}
/*
*****************************************************************************
* INTERRUPTS
*****************************************************************************
*/
static void skd_completion_worker(struct work_struct *work)
{
struct skd_device *skdev =
container_of(work, struct skd_device, completion_worker);
unsigned long flags;
int flush_enqueued = 0;
spin_lock_irqsave(&skdev->lock, flags);
/*
* pass in limit=0, which means no limit..
* process everything in compq
*/
skd_isr_completion_posted(skdev, 0, &flush_enqueued);
skd_request_fn(skdev->queue);
spin_unlock_irqrestore(&skdev->lock, flags);
}
static void skd_isr_msg_from_dev(struct skd_device *skdev);
irqreturn_t
static skd_isr(int irq, void *ptr)
{
struct skd_device *skdev;
u32 intstat;
u32 ack;
int rc = 0;
int deferred = 0;
int flush_enqueued = 0;
skdev = (struct skd_device *)ptr;
spin_lock(&skdev->lock);
for (;; ) {
intstat = SKD_READL(skdev, FIT_INT_STATUS_HOST);
ack = FIT_INT_DEF_MASK;
ack &= intstat;
pr_debug("%s:%s:%d intstat=0x%x ack=0x%x\n",
skdev->name, __func__, __LINE__, intstat, ack);
/* As long as there is an int pending on device, keep
* running loop. When none, get out, but if we've never
* done any processing, call completion handler?
*/
if (ack == 0) {
/* No interrupts on device, but run the completion
* processor anyway?
*/
if (rc == 0)
if (likely (skdev->state
== SKD_DRVR_STATE_ONLINE))
deferred = 1;
break;
}
rc = IRQ_HANDLED;
SKD_WRITEL(skdev, ack, FIT_INT_STATUS_HOST);
if (likely((skdev->state != SKD_DRVR_STATE_LOAD) &&
(skdev->state != SKD_DRVR_STATE_STOPPING))) {
if (intstat & FIT_ISH_COMPLETION_POSTED) {
/*
* If we have already deferred completion
* processing, don't bother running it again
*/
if (deferred == 0)
deferred =
skd_isr_completion_posted(skdev,
skd_isr_comp_limit, &flush_enqueued);
}
if (intstat & FIT_ISH_FW_STATE_CHANGE) {
skd_isr_fwstate(skdev);
if (skdev->state == SKD_DRVR_STATE_FAULT ||
skdev->state ==
SKD_DRVR_STATE_DISAPPEARED) {
spin_unlock(&skdev->lock);
return rc;
}
}
if (intstat & FIT_ISH_MSG_FROM_DEV)
skd_isr_msg_from_dev(skdev);
}
}
if (unlikely(flush_enqueued))
skd_request_fn(skdev->queue);
if (deferred)
schedule_work(&skdev->completion_worker);
else if (!flush_enqueued)
skd_request_fn(skdev->queue);
spin_unlock(&skdev->lock);
return rc;
}
static void skd_drive_fault(struct skd_device *skdev)
{
skdev->state = SKD_DRVR_STATE_FAULT;
pr_err("(%s): Drive FAULT\n", skd_name(skdev));
}