[Feature] add GA346 baseline version
Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/drivers/block/skd_main.c b/src/kernel/linux/v4.19/drivers/block/skd_main.c
new file mode 100644
index 0000000..27323fa
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/block/skd_main.c
@@ -0,0 +1,3677 @@
+/*
+ * Driver for sTec s1120 PCIe SSDs. sTec was acquired in 2013 by HGST and HGST
+ * was acquired by Western Digital in 2012.
+ *
+ * Copyright 2012 sTec, Inc.
+ * Copyright (c) 2017 Western Digital Corporation or its affiliates.
+ *
+ * This file is part of the Linux kernel, and is made available under
+ * the terms of the GNU General Public License version 2.
+ */
+
+#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/blk-mq.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/compiler.h>
+#include <linux/workqueue.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/aer.h>
+#include <linux/wait.h>
+#include <linux/stringify.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;
+
+#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 PFX DRV_NAME ": "
+
+MODULE_LICENSE("GPL");
+
+MODULE_DESCRIPTION("STEC s1120 PCIe SSD block driver");
+
+#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_MAX_REQ_PER_MSG 14
+
+#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_COMPLETION_ENTRY 256u
+#define SKD_N_READ_CAP_BYTES (8u)
+
+#define SKD_N_INTERNAL_BYTES (512u)
+
+#define SKD_SKCOMP_SIZE \
+ ((sizeof(struct fit_completion_entry_v1) + \
+ sizeof(struct fit_comp_error_info)) * SKD_N_COMPLETION_ENTRY)
+
+/* 5 bits of uniqifier, 0xF800 */
+#define SKD_ID_TABLE_MASK (3u << 8u)
+#define SKD_ID_RW_REQUEST (0u << 8u)
+#define SKD_ID_INTERNAL (1u << 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_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
+
+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_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_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,
+};
+
+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_msg_buf {
+ struct fit_msg_hdr fmh;
+ struct skd_scsi_request scsi[SKD_MAX_REQ_PER_MSG];
+};
+
+struct skd_fitmsg_context {
+ u32 id;
+
+ u32 length;
+
+ struct skd_msg_buf *msg_buf;
+ dma_addr_t mb_dma_address;
+};
+
+struct skd_request_context {
+ enum skd_req_state state;
+
+ u16 id;
+ u32 fitmsg_id;
+
+ u8 flush_cmd;
+
+ enum dma_data_direction 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;
+
+ blk_status_t status;
+};
+
+struct skd_special_context {
+ struct skd_request_context req;
+
+ void *data_buf;
+ dma_addr_t db_dma_address;
+
+ struct skd_msg_buf *msg_buf;
+ dma_addr_t mb_dma_address;
+};
+
+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 {
+ void __iomem *mem_map[SKD_MAX_BARS];
+ resource_size_t mem_phys[SKD_MAX_BARS];
+ u32 mem_size[SKD_MAX_BARS];
+
+ struct skd_msix_entry *msix_entries;
+
+ struct pci_dev *pdev;
+ int pcie_error_reporting_is_enabled;
+
+ spinlock_t lock;
+ struct gendisk *disk;
+ struct blk_mq_tag_set tag_set;
+ struct request_queue *queue;
+ struct skd_fitmsg_context *skmsg;
+ struct device *class_dev;
+ int gendisk_on;
+ int sync_done;
+
+ u32 devno;
+ u32 major;
+ char isr_name[30];
+
+ enum skd_drvr_state state;
+ u32 drive_state;
+
+ u32 cur_max_queue_depth;
+ u32 queue_low_water_mark;
+ u32 dev_max_queue_depth;
+
+ u32 num_fitmsg_context;
+ u32 num_req_context;
+
+ struct skd_fitmsg_context *skmsg_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 skcomp_cycle;
+ u32 skcomp_ix;
+ struct kmem_cache *msgbuf_cache;
+ struct kmem_cache *sglist_cache;
+ struct kmem_cache *databuf_cache;
+ 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 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 start_queue;
+ 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 = readl(skdev->mem_map[1] + offset);
+
+ if (unlikely(skdev->dbg_level >= 2))
+ dev_dbg(&skdev->pdev->dev, "offset %x = %x\n", offset, val);
+ return val;
+}
+
+static inline void skd_reg_write32(struct skd_device *skdev, u32 val,
+ u32 offset)
+{
+ writel(val, skdev->mem_map[1] + offset);
+ if (unlikely(skdev->dbg_level >= 2))
+ dev_dbg(&skdev->pdev->dev, "offset %x = %x\n", offset, val);
+}
+
+static inline void skd_reg_write64(struct skd_device *skdev, u64 val,
+ u32 offset)
+{
+ writeq(val, skdev->mem_map[1] + offset);
+ if (unlikely(skdev->dbg_level >= 2))
+ dev_dbg(&skdev->pdev->dev, "offset %x = %016llx\n", offset,
+ val);
+}
+
+
+#define SKD_IRQ_DEFAULT SKD_IRQ_MSIX
+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-" __stringify(SKD_MAX_REQ_PER_MSG) ", 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 = 1;
+module_param(skd_max_pass_thru, int, 0444);
+MODULE_PARM_DESC(skd_max_pass_thru,
+ "Maximum SCSI pass-thru at a time. IGNORED");
+
+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 bool 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_disable_interrupts(struct skd_device *skdev);
+static void skd_isr_fwstate(struct skd_device *skdev);
+static void skd_recover_requests(struct skd_device *skdev);
+static void skd_soft_reset(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_skreq(struct skd_device *skdev,
+ struct skd_request_context *skreq, const char *event);
+
+/*
+ *****************************************************************************
+ * READ/WRITE REQUESTS
+ *****************************************************************************
+ */
+static void skd_inc_in_flight(struct request *rq, void *data, bool reserved)
+{
+ int *count = data;
+
+ count++;
+}
+
+static int skd_in_flight(struct skd_device *skdev)
+{
+ int count = 0;
+
+ blk_mq_tagset_busy_iter(&skdev->tag_set, skd_inc_in_flight, &count);
+
+ return count;
+}
+
+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] = READ_10;
+ else
+ scsi_req->cdb[0] = WRITE_10;
+
+ 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] = SYNCHRONIZE_CACHE;
+ 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;
+}
+
+/*
+ * Return true if and only if all pending requests should be failed.
+ */
+static bool skd_fail_all(struct request_queue *q)
+{
+ struct skd_device *skdev = q->queuedata;
+
+ 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:
+ return false;
+
+ 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:
+ return true;
+ }
+}
+
+static blk_status_t skd_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
+ const struct blk_mq_queue_data *mqd)
+{
+ struct request *const req = mqd->rq;
+ struct request_queue *const q = req->q;
+ struct skd_device *skdev = q->queuedata;
+ struct skd_fitmsg_context *skmsg;
+ struct fit_msg_hdr *fmh;
+ const u32 tag = blk_mq_unique_tag(req);
+ struct skd_request_context *const skreq = blk_mq_rq_to_pdu(req);
+ struct skd_scsi_request *scsi_req;
+ unsigned long flags = 0;
+ const u32 lba = blk_rq_pos(req);
+ const u32 count = blk_rq_sectors(req);
+ const int data_dir = rq_data_dir(req);
+
+ if (unlikely(skdev->state != SKD_DRVR_STATE_ONLINE))
+ return skd_fail_all(q) ? BLK_STS_IOERR : BLK_STS_RESOURCE;
+
+ blk_mq_start_request(req);
+
+ WARN_ONCE(tag >= skd_max_queue_depth, "%#x > %#x (nr_requests = %lu)\n",
+ tag, skd_max_queue_depth, q->nr_requests);
+
+ SKD_ASSERT(skreq->state == SKD_REQ_STATE_IDLE);
+
+ dev_dbg(&skdev->pdev->dev,
+ "new req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n", req, lba,
+ lba, count, count, data_dir);
+
+ skreq->id = tag + SKD_ID_RW_REQUEST;
+ skreq->flush_cmd = 0;
+ skreq->n_sg = 0;
+ skreq->sg_byte_count = 0;
+
+ skreq->fitmsg_id = 0;
+
+ skreq->data_dir = data_dir == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+
+ if (req->bio && !skd_preop_sg_list(skdev, skreq)) {
+ dev_dbg(&skdev->pdev->dev, "error Out\n");
+ skreq->status = BLK_STS_RESOURCE;
+ blk_mq_complete_request(req);
+ return BLK_STS_OK;
+ }
+
+ dma_sync_single_for_device(&skdev->pdev->dev, skreq->sksg_dma_address,
+ skreq->n_sg *
+ sizeof(struct fit_sg_descriptor),
+ DMA_TO_DEVICE);
+
+ /* Either a FIT msg is in progress or we have to start one. */
+ if (skd_max_req_per_msg == 1) {
+ skmsg = NULL;
+ } else {
+ spin_lock_irqsave(&skdev->lock, flags);
+ skmsg = skdev->skmsg;
+ }
+ if (!skmsg) {
+ skmsg = &skdev->skmsg_table[tag];
+ skdev->skmsg = skmsg;
+
+ /* Initialize the FIT msg header */
+ fmh = &skmsg->msg_buf->fmh;
+ memset(fmh, 0, sizeof(*fmh));
+ fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
+ skmsg->length = sizeof(*fmh);
+ } else {
+ fmh = &skmsg->msg_buf->fmh;
+ }
+
+ skreq->fitmsg_id = skmsg->id;
+
+ scsi_req = &skmsg->msg_buf->scsi[fmh->num_protocol_cmds_coalesced];
+ memset(scsi_req, 0, sizeof(*scsi_req));
+
+ scsi_req->hdr.tag = skreq->id;
+ scsi_req->hdr.sg_list_dma_address =
+ cpu_to_be64(skreq->sksg_dma_address);
+
+ if (req_op(req) == REQ_OP_FLUSH) {
+ 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 (req->cmd_flags & REQ_FUA)
+ scsi_req->cdb[1] |= SKD_FUA_NV;
+
+ scsi_req->hdr.sg_list_len_bytes = cpu_to_be32(skreq->sg_byte_count);
+
+ /* Complete resource allocations. */
+ skreq->state = SKD_REQ_STATE_BUSY;
+
+ skmsg->length += sizeof(struct skd_scsi_request);
+ fmh->num_protocol_cmds_coalesced++;
+
+ dev_dbg(&skdev->pdev->dev, "req=0x%x busy=%d\n", skreq->id,
+ skd_in_flight(skdev));
+
+ /*
+ * If the FIT msg buffer is full send it.
+ */
+ if (skd_max_req_per_msg == 1) {
+ skd_send_fitmsg(skdev, skmsg);
+ } else {
+ if (mqd->last ||
+ fmh->num_protocol_cmds_coalesced >= skd_max_req_per_msg) {
+ skd_send_fitmsg(skdev, skmsg);
+ skdev->skmsg = NULL;
+ }
+ spin_unlock_irqrestore(&skdev->lock, flags);
+ }
+
+ return BLK_STS_OK;
+}
+
+static enum blk_eh_timer_return skd_timed_out(struct request *req,
+ bool reserved)
+{
+ struct skd_device *skdev = req->q->queuedata;
+
+ dev_err(&skdev->pdev->dev, "request with tag %#x timed out\n",
+ blk_mq_unique_tag(req));
+
+ return BLK_EH_RESET_TIMER;
+}
+
+static void skd_complete_rq(struct request *req)
+{
+ struct skd_request_context *skreq = blk_mq_rq_to_pdu(req);
+
+ blk_mq_end_request(req, skreq->status);
+}
+
+static bool skd_preop_sg_list(struct skd_device *skdev,
+ struct skd_request_context *skreq)
+{
+ struct request *req = blk_mq_rq_from_pdu(skreq);
+ struct scatterlist *sgl = &skreq->sg[0], *sg;
+ int n_sg;
+ int i;
+
+ skreq->sg_byte_count = 0;
+
+ WARN_ON_ONCE(skreq->data_dir != DMA_TO_DEVICE &&
+ skreq->data_dir != DMA_FROM_DEVICE);
+
+ n_sg = blk_rq_map_sg(skdev->queue, req, sgl);
+ if (n_sg <= 0)
+ return false;
+
+ /*
+ * Map scatterlist to PCI bus addresses.
+ * Note PCI might change the number of entries.
+ */
+ n_sg = pci_map_sg(skdev->pdev, sgl, n_sg, skreq->data_dir);
+ if (n_sg <= 0)
+ return false;
+
+ SKD_ASSERT(n_sg <= skdev->sgs_per_request);
+
+ skreq->n_sg = n_sg;
+
+ for_each_sg(sgl, sg, n_sg, i) {
+ struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
+ u32 cnt = sg_dma_len(sg);
+ uint64_t dma_addr = sg_dma_address(sg);
+
+ 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)) {
+ dev_dbg(&skdev->pdev->dev,
+ "skreq=%x sksg_list=%p sksg_dma=%pad\n",
+ 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];
+
+ dev_dbg(&skdev->pdev->dev,
+ " sg[%d] count=%u ctrl=0x%x addr=0x%llx next=0x%llx\n",
+ i, sgd->byte_count, sgd->control,
+ sgd->host_side_addr, sgd->next_desc_ptr);
+ }
+ }
+
+ return true;
+}
+
+static void skd_postop_sg_list(struct skd_device *skdev,
+ struct skd_request_context *skreq)
+{
+ /*
+ * 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, skreq->data_dir);
+}
+
+/*
+ *****************************************************************************
+ * TIMER
+ *****************************************************************************
+ */
+
+static void skd_timer_tick_not_online(struct skd_device *skdev);
+
+static void skd_start_queue(struct work_struct *work)
+{
+ struct skd_device *skdev = container_of(work, typeof(*skdev),
+ start_queue);
+
+ /*
+ * Although it is safe to call blk_start_queue() from interrupt
+ * context, blk_mq_start_hw_queues() must not be called from
+ * interrupt context.
+ */
+ blk_mq_start_hw_queues(skdev->queue);
+}
+
+static void skd_timer_tick(struct timer_list *t)
+{
+ struct skd_device *skdev = from_timer(skdev, t, timer);
+ 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);
+
+ 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:
+ dev_dbg(&skdev->pdev->dev,
+ "drive busy sanitize[%x], driver[%x]\n",
+ 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);
+ break;
+
+ case SKD_DRVR_STATE_BUSY:
+ case SKD_DRVR_STATE_BUSY_IMMINENT:
+ case SKD_DRVR_STATE_BUSY_ERASE:
+ dev_dbg(&skdev->pdev->dev, "busy[%x], countdown=%d\n",
+ skdev->state, skdev->timer_countdown);
+ if (skdev->timer_countdown > 0) {
+ skdev->timer_countdown--;
+ return;
+ }
+ dev_dbg(&skdev->pdev->dev,
+ "busy[%x], timedout=%d, restarting device.",
+ 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;
+
+ dev_err(&skdev->pdev->dev, "DriveFault Connect Timeout (%x)\n",
+ skdev->drive_state);
+
+ /*start the queue so we can respond with error to requests */
+ /* wakeup anyone waiting for startup complete */
+ schedule_work(&skdev->start_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_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;
+ dev_err(&skdev->pdev->dev,
+ "DriveFault Reconnect Timeout (%x)\n",
+ 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);
+ else {
+ dev_err(&skdev->pdev->dev, "Disable BusMaster (%x)\n",
+ skdev->drive_state);
+ pci_disable_device(skdev->pdev);
+ skd_disable_interrupts(skdev);
+ skd_recover_requests(skdev);
+ }
+
+ /*start the queue so we can respond with error to requests */
+ /* wakeup anyone waiting for startup complete */
+ schedule_work(&skdev->start_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;
+
+ timer_setup(&skdev->timer, skd_timer_tick, 0);
+
+ rc = mod_timer(&skdev->timer, (jiffies + HZ));
+ if (rc)
+ dev_err(&skdev->pdev->dev, "failed to start timer %d\n", rc);
+ return rc;
+}
+
+static void skd_kill_timer(struct skd_device *skdev)
+{
+ del_timer_sync(&skdev->timer);
+}
+
+/*
+ *****************************************************************************
+ * 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 = &skspcl->msg_buf->fmh;
+ fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
+ fmh->num_protocol_cmds_coalesced = 1;
+
+ scsi = &skspcl->msg_buf->scsi[0];
+ memset(scsi, 0, sizeof(*scsi));
+ dma_address = skspcl->req.sksg_dma_address;
+ scsi->hdr.sg_list_dma_address = cpu_to_be64(dma_address);
+ skspcl->req.n_sg = 1;
+ 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;
+
+ skspcl->req.state = SKD_REQ_STATE_BUSY;
+
+ scsi = &skspcl->msg_buf->scsi[0];
+ 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)) {
+ dev_err(&skdev->pdev->dev,
+ "*** LOST_WRITE_DATA ERROR *** key/asc/ascq/fruc %02x/%02x/%02x/%02x\n",
+ key, code, qual, fruc);
+ }
+}
+
+static void skd_complete_internal(struct skd_device *skdev,
+ struct fit_completion_entry_v1 *skcomp,
+ 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 = &skspcl->msg_buf->scsi[0];
+
+ lockdep_assert_held(&skdev->lock);
+
+ SKD_ASSERT(skspcl == &skdev->internal_skspcl);
+
+ dev_dbg(&skdev->pdev->dev, "complete internal %x\n", scsi->cdb[0]);
+
+ dma_sync_single_for_cpu(&skdev->pdev->dev,
+ skspcl->db_dma_address,
+ skspcl->req.sksg_list[0].byte_count,
+ DMA_BIDIRECTIONAL);
+
+ skspcl->req.completion = *skcomp;
+ skspcl->req.state = SKD_REQ_STATE_IDLE;
+
+ 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) {
+ dev_dbg(&skdev->pdev->dev,
+ "TUR failed, don't send anymore state 0x%x\n",
+ skdev->state);
+ return;
+ }
+ dev_dbg(&skdev->pdev->dev,
+ "**** TUR failed, retry skerr\n");
+ skd_send_internal_skspcl(skdev, skspcl,
+ TEST_UNIT_READY);
+ }
+ 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) {
+ dev_dbg(&skdev->pdev->dev,
+ "write buffer failed, don't send anymore state 0x%x\n",
+ skdev->state);
+ return;
+ }
+ dev_dbg(&skdev->pdev->dev,
+ "**** write buffer failed, retry skerr\n");
+ skd_send_internal_skspcl(skdev, skspcl,
+ TEST_UNIT_READY);
+ }
+ 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 {
+ dev_err(&skdev->pdev->dev,
+ "*** W/R Buffer mismatch %d ***\n",
+ skdev->connect_retries);
+ if (skdev->connect_retries <
+ SKD_MAX_CONNECT_RETRIES) {
+ skdev->connect_retries++;
+ skd_soft_reset(skdev);
+ } else {
+ dev_err(&skdev->pdev->dev,
+ "W/R Buffer Connect Error\n");
+ return;
+ }
+ }
+
+ } else {
+ if (skdev->state == SKD_DRVR_STATE_STOPPING) {
+ dev_dbg(&skdev->pdev->dev,
+ "read buffer failed, don't send anymore state 0x%x\n",
+ skdev->state);
+ return;
+ }
+ dev_dbg(&skdev->pdev->dev,
+ "**** read buffer failed, retry skerr\n");
+ skd_send_internal_skspcl(skdev, skspcl,
+ TEST_UNIT_READY);
+ }
+ 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];
+
+ dev_dbg(&skdev->pdev->dev, "last lba %d, bs %d\n",
+ 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);
+ dev_dbg(&skdev->pdev->dev, "**** MEDIUM ERROR caused READCAP to fail, ignore failure and continue to inquiry\n");
+ skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
+ } else {
+ dev_dbg(&skdev->pdev->dev, "**** READCAP failed, retry TUR\n");
+ 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)
+ dev_dbg(&skdev->pdev->dev, "**** failed, to ONLINE device\n");
+ /* 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;
+
+ dev_dbg(&skdev->pdev->dev, "dma address %pad, busy=%d\n",
+ &skmsg->mb_dma_address, skd_in_flight(skdev));
+ dev_dbg(&skdev->pdev->dev, "msg_buf %p\n", skmsg->msg_buf);
+
+ qcmd = skmsg->mb_dma_address;
+ qcmd |= FIT_QCMD_QID_NORMAL;
+
+ if (unlikely(skdev->dbg_level > 1)) {
+ u8 *bp = (u8 *)skmsg->msg_buf;
+ int i;
+ for (i = 0; i < skmsg->length; i += 8) {
+ dev_dbg(&skdev->pdev->dev, "msg[%2d] %8ph\n", i,
+ &bp[i]);
+ 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;
+
+ dma_sync_single_for_device(&skdev->pdev->dev, skmsg->mb_dma_address,
+ skmsg->length, DMA_TO_DEVICE);
+
+ /* Make sure skd_msg_buf is written before the doorbell is triggered. */
+ smp_wmb();
+
+ SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
+}
+
+static void skd_send_special_fitmsg(struct skd_device *skdev,
+ struct skd_special_context *skspcl)
+{
+ u64 qcmd;
+
+ WARN_ON_ONCE(skspcl->req.n_sg != 1);
+
+ 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) {
+ dev_dbg(&skdev->pdev->dev, " spcl[%2d] %8ph\n", i,
+ &bp[i]);
+ if (i == 0)
+ i = 64 - 8;
+ }
+
+ dev_dbg(&skdev->pdev->dev,
+ "skspcl=%p id=%04x sksg_list=%p sksg_dma=%pad\n",
+ 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];
+
+ dev_dbg(&skdev->pdev->dev,
+ " sg[%d] count=%u ctrl=0x%x addr=0x%llx next=0x%llx\n",
+ 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;
+
+ dma_sync_single_for_device(&skdev->pdev->dev, skspcl->mb_dma_address,
+ SKD_N_SPECIAL_FITMSG_BYTES, DMA_TO_DEVICE);
+ dma_sync_single_for_device(&skdev->pdev->dev,
+ skspcl->req.sksg_dma_address,
+ 1 * sizeof(struct fit_sg_descriptor),
+ DMA_TO_DEVICE);
+ dma_sync_single_for_device(&skdev->pdev->dev,
+ skspcl->db_dma_address,
+ skspcl->req.sksg_list[0].byte_count,
+ DMA_BIDIRECTIONAL);
+
+ /* Make sure skd_msg_buf is written before the doorbell is triggered. */
+ smp_wmb();
+
+ SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
+}
+
+/*
+ *****************************************************************************
+ * COMPLETION QUEUE
+ *****************************************************************************
+ */
+
+static void skd_complete_other(struct skd_device *skdev,
+ struct fit_completion_entry_v1 *skcomp,
+ 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, struct fit_comp_error_info *skerr)
+{
+ int i;
+
+ dev_err(&skdev->pdev->dev, "key/asc/ascq/fruc %02x/%02x/%02x/%02x\n",
+ skerr->key, skerr->code, skerr->qual, skerr->fruc);
+
+ dev_dbg(&skdev->pdev->dev,
+ "stat: t=%02x stat=%02x k=%02x c=%02x q=%02x fruc=%02x\n",
+ skerr->type, cmp_status, skerr->key, skerr->code, skerr->qual,
+ skerr->fruc);
+
+ /* Does the info match an entry in the good category? */
+ for (i = 0; i < ARRAY_SIZE(skd_chkstat_table); 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) {
+ dev_err(&skdev->pdev->dev,
+ "SMART Alert: sense key/asc/ascq %02x/%02x/%02x\n",
+ skerr->key, skerr->code, skerr->qual);
+ }
+ return sns->action;
+ }
+
+ /* No other match, so nonzero status means error,
+ * zero status means good
+ */
+ if (cmp_status) {
+ dev_dbg(&skdev->pdev->dev, "status check: error\n");
+ return SKD_CHECK_STATUS_REPORT_ERROR;
+ }
+
+ dev_dbg(&skdev->pdev->dev, "status check good default\n");
+ return SKD_CHECK_STATUS_REPORT_GOOD;
+}
+
+static void skd_resolve_req_exception(struct skd_device *skdev,
+ struct skd_request_context *skreq,
+ struct request *req)
+{
+ 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:
+ skreq->status = BLK_STS_OK;
+ blk_mq_complete_request(req);
+ break;
+
+ case SKD_CHECK_STATUS_BUSY_IMMINENT:
+ skd_log_skreq(skdev, skreq, "retry(busy)");
+ blk_mq_requeue_request(req, true);
+ dev_info(&skdev->pdev->dev, "drive BUSY imminent\n");
+ 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) ++req->special < SKD_MAX_RETRIES) {
+ skd_log_skreq(skdev, skreq, "retry");
+ blk_mq_requeue_request(req, true);
+ break;
+ }
+ /* fall through */
+
+ case SKD_CHECK_STATUS_REPORT_ERROR:
+ default:
+ skreq->status = BLK_STS_IOERR;
+ blk_mq_complete_request(req);
+ break;
+ }
+}
+
+static void skd_release_skreq(struct skd_device *skdev,
+ struct skd_request_context *skreq)
+{
+ /*
+ * Reclaim the skd_request_context
+ */
+ skreq->state = SKD_REQ_STATE_IDLE;
+}
+
+static int skd_isr_completion_posted(struct skd_device *skdev,
+ int limit, int *enqueued)
+{
+ struct fit_completion_entry_v1 *skcmp;
+ struct fit_comp_error_info *skerr;
+ u16 req_id;
+ u32 tag;
+ u16 hwq = 0;
+ struct request *rq;
+ struct skd_request_context *skreq;
+ u16 cmp_cntxt;
+ u8 cmp_status;
+ u8 cmp_cycle;
+ u32 cmp_bytes;
+ int rc = 0;
+ int processed = 0;
+
+ lockdep_assert_held(&skdev->lock);
+
+ 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];
+
+ dev_dbg(&skdev->pdev->dev,
+ "cycle=%d ix=%d got cycle=%d cmdctxt=0x%x stat=%d busy=%d rbytes=0x%x proto=%d\n",
+ skdev->skcomp_cycle, skdev->skcomp_ix, cmp_cycle,
+ cmp_cntxt, cmp_status, skd_in_flight(skdev),
+ cmp_bytes, skdev->proto_ver);
+
+ if (cmp_cycle != skdev->skcomp_cycle) {
+ dev_dbg(&skdev->pdev->dev, "end of completions\n");
+ 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;
+ tag = req_id & SKD_ID_SLOT_AND_TABLE_MASK;
+
+ /* Is this other than a r/w request? */
+ if (tag >= skdev->num_req_context) {
+ /*
+ * This is not a completion for a r/w request.
+ */
+ WARN_ON_ONCE(blk_mq_tag_to_rq(skdev->tag_set.tags[hwq],
+ tag));
+ skd_complete_other(skdev, skcmp, skerr);
+ continue;
+ }
+
+ rq = blk_mq_tag_to_rq(skdev->tag_set.tags[hwq], tag);
+ if (WARN(!rq, "No request for tag %#x -> %#x\n", cmp_cntxt,
+ tag))
+ continue;
+ skreq = blk_mq_rq_to_pdu(rq);
+
+ /*
+ * Make sure the request ID for the slot matches.
+ */
+ if (skreq->id != req_id) {
+ dev_err(&skdev->pdev->dev,
+ "Completion mismatch comp_id=0x%04x skreq=0x%04x new=0x%04x\n",
+ req_id, skreq->id, cmp_cntxt);
+
+ continue;
+ }
+
+ SKD_ASSERT(skreq->state == SKD_REQ_STATE_BUSY);
+
+ 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);
+
+ skd_release_skreq(skdev, skreq);
+
+ /*
+ * Capture the outcome and post it back to the native request.
+ */
+ if (likely(cmp_status == SAM_STAT_GOOD)) {
+ skreq->status = BLK_STS_OK;
+ blk_mq_complete_request(rq);
+ } else {
+ skd_resolve_req_exception(skdev, skreq, rq);
+ }
+
+ /* skd_isr_comp_limit equal zero means no limit */
+ if (limit) {
+ if (++processed >= limit) {
+ rc = 1;
+ break;
+ }
+ }
+ }
+
+ if (skdev->state == SKD_DRVR_STATE_PAUSING &&
+ skd_in_flight(skdev) == 0) {
+ skdev->state = SKD_DRVR_STATE_PAUSED;
+ wake_up_interruptible(&skdev->waitq);
+ }
+
+ return rc;
+}
+
+static void skd_complete_other(struct skd_device *skdev,
+ struct fit_completion_entry_v1 *skcomp,
+ struct fit_comp_error_info *skerr)
+{
+ u32 req_id = 0;
+ u32 req_table;
+ u32 req_slot;
+ struct skd_special_context *skspcl;
+
+ lockdep_assert_held(&skdev->lock);
+
+ req_id = skcomp->tag;
+ req_table = req_id & SKD_ID_TABLE_MASK;
+ req_slot = req_id & SKD_ID_SLOT_MASK;
+
+ dev_dbg(&skdev->pdev->dev, "table=0x%x id=0x%x slot=%d\n", 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_isr_completion_posted() above,
+ * handles r/w requests. The only way we get here
+ * is if the req_slot is out of bounds.
+ */
+ 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_reset_skcomp(struct skd_device *skdev)
+{
+ memset(skdev->skcomp_table, 0, SKD_SKCOMP_SIZE);
+
+ 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);
+ schedule_work(&skdev->start_queue);
+
+ spin_unlock_irqrestore(&skdev->lock, flags);
+}
+
+static void skd_isr_msg_from_dev(struct skd_device *skdev);
+
+static irqreturn_t
+skd_isr(int irq, void *ptr)
+{
+ struct skd_device *skdev = ptr;
+ u32 intstat;
+ u32 ack;
+ int rc = 0;
+ int deferred = 0;
+ int flush_enqueued = 0;
+
+ spin_lock(&skdev->lock);
+
+ for (;; ) {
+ intstat = SKD_READL(skdev, FIT_INT_STATUS_HOST);
+
+ ack = FIT_INT_DEF_MASK;
+ ack &= intstat;
+
+ dev_dbg(&skdev->pdev->dev, "intstat=0x%x ack=0x%x\n", 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))
+ schedule_work(&skdev->start_queue);
+
+ if (deferred)
+ schedule_work(&skdev->completion_worker);
+ else if (!flush_enqueued)
+ schedule_work(&skdev->start_queue);
+
+ spin_unlock(&skdev->lock);
+
+ return rc;
+}
+
+static void skd_drive_fault(struct skd_device *skdev)
+{
+ skdev->state = SKD_DRVR_STATE_FAULT;
+ dev_err(&skdev->pdev->dev, "Drive FAULT\n");
+}
+
+static void skd_drive_disappeared(struct skd_device *skdev)
+{
+ skdev->state = SKD_DRVR_STATE_DISAPPEARED;
+ dev_err(&skdev->pdev->dev, "Drive DISAPPEARED\n");
+}
+
+static void skd_isr_fwstate(struct skd_device *skdev)
+{
+ u32 sense;
+ u32 state;
+ u32 mtd;
+ int prev_driver_state = skdev->state;
+
+ sense = SKD_READL(skdev, FIT_STATUS);
+ state = sense & FIT_SR_DRIVE_STATE_MASK;
+
+ dev_err(&skdev->pdev->dev, "s1120 state %s(%d)=>%s(%d)\n",
+ skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
+ skd_drive_state_to_str(state), state);
+
+ skdev->drive_state = state;
+
+ switch (skdev->drive_state) {
+ case FIT_SR_DRIVE_INIT:
+ if (skdev->state == SKD_DRVR_STATE_PROTOCOL_MISMATCH) {
+ skd_disable_interrupts(skdev);
+ break;
+ }
+ if (skdev->state == SKD_DRVR_STATE_RESTARTING)
+ skd_recover_requests(skdev);
+ if (skdev->state == SKD_DRVR_STATE_WAIT_BOOT) {
+ skdev->timer_countdown = SKD_STARTING_TIMO;
+ skdev->state = SKD_DRVR_STATE_STARTING;
+ skd_soft_reset(skdev);
+ break;
+ }
+ mtd = FIT_MXD_CONS(FIT_MTD_FITFW_INIT, 0, 0);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+ break;
+
+ case FIT_SR_DRIVE_ONLINE:
+ skdev->cur_max_queue_depth = skd_max_queue_depth;
+ if (skdev->cur_max_queue_depth > skdev->dev_max_queue_depth)
+ skdev->cur_max_queue_depth = skdev->dev_max_queue_depth;
+
+ skdev->queue_low_water_mark =
+ skdev->cur_max_queue_depth * 2 / 3 + 1;
+ if (skdev->queue_low_water_mark < 1)
+ skdev->queue_low_water_mark = 1;
+ dev_info(&skdev->pdev->dev,
+ "Queue depth limit=%d dev=%d lowat=%d\n",
+ skdev->cur_max_queue_depth,
+ skdev->dev_max_queue_depth,
+ skdev->queue_low_water_mark);
+
+ skd_refresh_device_data(skdev);
+ break;
+
+ case FIT_SR_DRIVE_BUSY:
+ skdev->state = SKD_DRVR_STATE_BUSY;
+ skdev->timer_countdown = SKD_BUSY_TIMO;
+ skd_quiesce_dev(skdev);
+ break;
+ case FIT_SR_DRIVE_BUSY_SANITIZE:
+ /* set timer for 3 seconds, we'll abort any unfinished
+ * commands after that expires
+ */
+ skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
+ skdev->timer_countdown = SKD_TIMER_SECONDS(3);
+ schedule_work(&skdev->start_queue);
+ break;
+ case FIT_SR_DRIVE_BUSY_ERASE:
+ skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
+ skdev->timer_countdown = SKD_BUSY_TIMO;
+ break;
+ case FIT_SR_DRIVE_OFFLINE:
+ skdev->state = SKD_DRVR_STATE_IDLE;
+ break;
+ case FIT_SR_DRIVE_SOFT_RESET:
+ switch (skdev->state) {
+ case SKD_DRVR_STATE_STARTING:
+ case SKD_DRVR_STATE_RESTARTING:
+ /* Expected by a caller of skd_soft_reset() */
+ break;
+ default:
+ skdev->state = SKD_DRVR_STATE_RESTARTING;
+ break;
+ }
+ break;
+ case FIT_SR_DRIVE_FW_BOOTING:
+ dev_dbg(&skdev->pdev->dev, "ISR FIT_SR_DRIVE_FW_BOOTING\n");
+ skdev->state = SKD_DRVR_STATE_WAIT_BOOT;
+ skdev->timer_countdown = SKD_WAIT_BOOT_TIMO;
+ break;
+
+ case FIT_SR_DRIVE_DEGRADED:
+ case FIT_SR_PCIE_LINK_DOWN:
+ case FIT_SR_DRIVE_NEED_FW_DOWNLOAD:
+ break;
+
+ case FIT_SR_DRIVE_FAULT:
+ skd_drive_fault(skdev);
+ skd_recover_requests(skdev);
+ schedule_work(&skdev->start_queue);
+ break;
+
+ /* PCIe bus returned all Fs? */
+ case 0xFF:
+ dev_info(&skdev->pdev->dev, "state=0x%x sense=0x%x\n", state,
+ sense);
+ skd_drive_disappeared(skdev);
+ skd_recover_requests(skdev);
+ schedule_work(&skdev->start_queue);
+ break;
+ default:
+ /*
+ * Uknown FW State. Wait for a state we recognize.
+ */
+ break;
+ }
+ dev_err(&skdev->pdev->dev, "Driver state %s(%d)=>%s(%d)\n",
+ skd_skdev_state_to_str(prev_driver_state), prev_driver_state,
+ skd_skdev_state_to_str(skdev->state), skdev->state);
+}
+
+static void skd_recover_request(struct request *req, void *data, bool reserved)
+{
+ struct skd_device *const skdev = data;
+ struct skd_request_context *skreq = blk_mq_rq_to_pdu(req);
+
+ if (skreq->state != SKD_REQ_STATE_BUSY)
+ return;
+
+ skd_log_skreq(skdev, skreq, "recover");
+
+ /* Release DMA resources for the request. */
+ if (skreq->n_sg > 0)
+ skd_postop_sg_list(skdev, skreq);
+
+ skreq->state = SKD_REQ_STATE_IDLE;
+ skreq->status = BLK_STS_IOERR;
+ blk_mq_complete_request(req);
+}
+
+static void skd_recover_requests(struct skd_device *skdev)
+{
+ blk_mq_tagset_busy_iter(&skdev->tag_set, skd_recover_request, skdev);
+}
+
+static void skd_isr_msg_from_dev(struct skd_device *skdev)
+{
+ u32 mfd;
+ u32 mtd;
+ u32 data;
+
+ mfd = SKD_READL(skdev, FIT_MSG_FROM_DEVICE);
+
+ dev_dbg(&skdev->pdev->dev, "mfd=0x%x last_mtd=0x%x\n", mfd,
+ skdev->last_mtd);
+
+ /* ignore any mtd that is an ack for something we didn't send */
+ if (FIT_MXD_TYPE(mfd) != FIT_MXD_TYPE(skdev->last_mtd))
+ return;
+
+ switch (FIT_MXD_TYPE(mfd)) {
+ case FIT_MTD_FITFW_INIT:
+ skdev->proto_ver = FIT_PROTOCOL_MAJOR_VER(mfd);
+
+ if (skdev->proto_ver != FIT_PROTOCOL_VERSION_1) {
+ dev_err(&skdev->pdev->dev, "protocol mismatch\n");
+ dev_err(&skdev->pdev->dev, " got=%d support=%d\n",
+ skdev->proto_ver, FIT_PROTOCOL_VERSION_1);
+ dev_err(&skdev->pdev->dev, " please upgrade driver\n");
+ skdev->state = SKD_DRVR_STATE_PROTOCOL_MISMATCH;
+ skd_soft_reset(skdev);
+ break;
+ }
+ mtd = FIT_MXD_CONS(FIT_MTD_GET_CMDQ_DEPTH, 0, 0);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+ break;
+
+ case FIT_MTD_GET_CMDQ_DEPTH:
+ skdev->dev_max_queue_depth = FIT_MXD_DATA(mfd);
+ mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_DEPTH, 0,
+ SKD_N_COMPLETION_ENTRY);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+ break;
+
+ case FIT_MTD_SET_COMPQ_DEPTH:
+ SKD_WRITEQ(skdev, skdev->cq_dma_address, FIT_MSG_TO_DEVICE_ARG);
+ mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_ADDR, 0, 0);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+ break;
+
+ case FIT_MTD_SET_COMPQ_ADDR:
+ skd_reset_skcomp(skdev);
+ mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_HOST_ID, 0, skdev->devno);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+ break;
+
+ case FIT_MTD_CMD_LOG_HOST_ID:
+ /* hardware interface overflows in y2106 */
+ skdev->connect_time_stamp = (u32)ktime_get_real_seconds();
+ data = skdev->connect_time_stamp & 0xFFFF;
+ mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_LO, 0, data);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+ break;
+
+ case FIT_MTD_CMD_LOG_TIME_STAMP_LO:
+ skdev->drive_jiffies = FIT_MXD_DATA(mfd);
+ data = (skdev->connect_time_stamp >> 16) & 0xFFFF;
+ mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_HI, 0, data);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+ break;
+
+ case FIT_MTD_CMD_LOG_TIME_STAMP_HI:
+ skdev->drive_jiffies |= (FIT_MXD_DATA(mfd) << 16);
+ mtd = FIT_MXD_CONS(FIT_MTD_ARM_QUEUE, 0, 0);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+
+ dev_err(&skdev->pdev->dev, "Time sync driver=0x%x device=0x%x\n",
+ skdev->connect_time_stamp, skdev->drive_jiffies);
+ break;
+
+ case FIT_MTD_ARM_QUEUE:
+ skdev->last_mtd = 0;
+ /*
+ * State should be, or soon will be, FIT_SR_DRIVE_ONLINE.
+ */
+ break;
+
+ default:
+ break;
+ }
+}
+
+static void skd_disable_interrupts(struct skd_device *skdev)
+{
+ u32 sense;
+
+ sense = SKD_READL(skdev, FIT_CONTROL);
+ sense &= ~FIT_CR_ENABLE_INTERRUPTS;
+ SKD_WRITEL(skdev, sense, FIT_CONTROL);
+ dev_dbg(&skdev->pdev->dev, "sense 0x%x\n", sense);
+
+ /* Note that the 1s is written. A 1-bit means
+ * disable, a 0 means enable.
+ */
+ SKD_WRITEL(skdev, ~0, FIT_INT_MASK_HOST);
+}
+
+static void skd_enable_interrupts(struct skd_device *skdev)
+{
+ u32 val;
+
+ /* unmask interrupts first */
+ val = FIT_ISH_FW_STATE_CHANGE +
+ FIT_ISH_COMPLETION_POSTED + FIT_ISH_MSG_FROM_DEV;
+
+ /* Note that the compliment of mask is written. A 1-bit means
+ * disable, a 0 means enable. */
+ SKD_WRITEL(skdev, ~val, FIT_INT_MASK_HOST);
+ dev_dbg(&skdev->pdev->dev, "interrupt mask=0x%x\n", ~val);
+
+ val = SKD_READL(skdev, FIT_CONTROL);
+ val |= FIT_CR_ENABLE_INTERRUPTS;
+ dev_dbg(&skdev->pdev->dev, "control=0x%x\n", val);
+ SKD_WRITEL(skdev, val, FIT_CONTROL);
+}
+
+/*
+ *****************************************************************************
+ * START, STOP, RESTART, QUIESCE, UNQUIESCE
+ *****************************************************************************
+ */
+
+static void skd_soft_reset(struct skd_device *skdev)
+{
+ u32 val;
+
+ val = SKD_READL(skdev, FIT_CONTROL);
+ val |= (FIT_CR_SOFT_RESET);
+ dev_dbg(&skdev->pdev->dev, "control=0x%x\n", val);
+ SKD_WRITEL(skdev, val, FIT_CONTROL);
+}
+
+static void skd_start_device(struct skd_device *skdev)
+{
+ unsigned long flags;
+ u32 sense;
+ u32 state;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+
+ /* ack all ghost interrupts */
+ SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
+
+ sense = SKD_READL(skdev, FIT_STATUS);
+
+ dev_dbg(&skdev->pdev->dev, "initial status=0x%x\n", sense);
+
+ state = sense & FIT_SR_DRIVE_STATE_MASK;
+ skdev->drive_state = state;
+ skdev->last_mtd = 0;
+
+ skdev->state = SKD_DRVR_STATE_STARTING;
+ skdev->timer_countdown = SKD_STARTING_TIMO;
+
+ skd_enable_interrupts(skdev);
+
+ switch (skdev->drive_state) {
+ case FIT_SR_DRIVE_OFFLINE:
+ dev_err(&skdev->pdev->dev, "Drive offline...\n");
+ break;
+
+ case FIT_SR_DRIVE_FW_BOOTING:
+ dev_dbg(&skdev->pdev->dev, "FIT_SR_DRIVE_FW_BOOTING\n");
+ skdev->state = SKD_DRVR_STATE_WAIT_BOOT;
+ skdev->timer_countdown = SKD_WAIT_BOOT_TIMO;
+ break;
+
+ case FIT_SR_DRIVE_BUSY_SANITIZE:
+ dev_info(&skdev->pdev->dev, "Start: BUSY_SANITIZE\n");
+ skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
+ skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
+ break;
+
+ case FIT_SR_DRIVE_BUSY_ERASE:
+ dev_info(&skdev->pdev->dev, "Start: BUSY_ERASE\n");
+ skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
+ skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
+ break;
+
+ case FIT_SR_DRIVE_INIT:
+ case FIT_SR_DRIVE_ONLINE:
+ skd_soft_reset(skdev);
+ break;
+
+ case FIT_SR_DRIVE_BUSY:
+ dev_err(&skdev->pdev->dev, "Drive Busy...\n");
+ skdev->state = SKD_DRVR_STATE_BUSY;
+ skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
+ break;
+
+ case FIT_SR_DRIVE_SOFT_RESET:
+ dev_err(&skdev->pdev->dev, "drive soft reset in prog\n");
+ break;
+
+ case FIT_SR_DRIVE_FAULT:
+ /* Fault state is bad...soft reset won't do it...
+ * Hard reset, maybe, but does it work on device?
+ * For now, just fault so the system doesn't hang.
+ */
+ skd_drive_fault(skdev);
+ /*start the queue so we can respond with error to requests */
+ dev_dbg(&skdev->pdev->dev, "starting queue\n");
+ schedule_work(&skdev->start_queue);
+ skdev->gendisk_on = -1;
+ wake_up_interruptible(&skdev->waitq);
+ break;
+
+ case 0xFF:
+ /* Most likely the device isn't there or isn't responding
+ * to the BAR1 addresses. */
+ skd_drive_disappeared(skdev);
+ /*start the queue so we can respond with error to requests */
+ dev_dbg(&skdev->pdev->dev,
+ "starting queue to error-out reqs\n");
+ schedule_work(&skdev->start_queue);
+ skdev->gendisk_on = -1;
+ wake_up_interruptible(&skdev->waitq);
+ break;
+
+ default:
+ dev_err(&skdev->pdev->dev, "Start: unknown state %x\n",
+ skdev->drive_state);
+ break;
+ }
+
+ state = SKD_READL(skdev, FIT_CONTROL);
+ dev_dbg(&skdev->pdev->dev, "FIT Control Status=0x%x\n", state);
+
+ state = SKD_READL(skdev, FIT_INT_STATUS_HOST);
+ dev_dbg(&skdev->pdev->dev, "Intr Status=0x%x\n", state);
+
+ state = SKD_READL(skdev, FIT_INT_MASK_HOST);
+ dev_dbg(&skdev->pdev->dev, "Intr Mask=0x%x\n", state);
+
+ state = SKD_READL(skdev, FIT_MSG_FROM_DEVICE);
+ dev_dbg(&skdev->pdev->dev, "Msg from Dev=0x%x\n", state);
+
+ state = SKD_READL(skdev, FIT_HW_VERSION);
+ dev_dbg(&skdev->pdev->dev, "HW version=0x%x\n", state);
+
+ spin_unlock_irqrestore(&skdev->lock, flags);
+}
+
+static void skd_stop_device(struct skd_device *skdev)
+{
+ unsigned long flags;
+ struct skd_special_context *skspcl = &skdev->internal_skspcl;
+ u32 dev_state;
+ int i;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+
+ if (skdev->state != SKD_DRVR_STATE_ONLINE) {
+ dev_err(&skdev->pdev->dev, "%s not online no sync\n", __func__);
+ goto stop_out;
+ }
+
+ if (skspcl->req.state != SKD_REQ_STATE_IDLE) {
+ dev_err(&skdev->pdev->dev, "%s no special\n", __func__);
+ goto stop_out;
+ }
+
+ skdev->state = SKD_DRVR_STATE_SYNCING;
+ skdev->sync_done = 0;
+
+ skd_send_internal_skspcl(skdev, skspcl, SYNCHRONIZE_CACHE);
+
+ spin_unlock_irqrestore(&skdev->lock, flags);
+
+ wait_event_interruptible_timeout(skdev->waitq,
+ (skdev->sync_done), (10 * HZ));
+
+ spin_lock_irqsave(&skdev->lock, flags);
+
+ switch (skdev->sync_done) {
+ case 0:
+ dev_err(&skdev->pdev->dev, "%s no sync\n", __func__);
+ break;
+ case 1:
+ dev_err(&skdev->pdev->dev, "%s sync done\n", __func__);
+ break;
+ default:
+ dev_err(&skdev->pdev->dev, "%s sync error\n", __func__);
+ }
+
+stop_out:
+ skdev->state = SKD_DRVR_STATE_STOPPING;
+ spin_unlock_irqrestore(&skdev->lock, flags);
+
+ skd_kill_timer(skdev);
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ skd_disable_interrupts(skdev);
+
+ /* ensure all ints on device are cleared */
+ /* soft reset the device to unload with a clean slate */
+ SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
+ SKD_WRITEL(skdev, FIT_CR_SOFT_RESET, FIT_CONTROL);
+
+ spin_unlock_irqrestore(&skdev->lock, flags);
+
+ /* poll every 100ms, 1 second timeout */
+ for (i = 0; i < 10; i++) {
+ dev_state =
+ SKD_READL(skdev, FIT_STATUS) & FIT_SR_DRIVE_STATE_MASK;
+ if (dev_state == FIT_SR_DRIVE_INIT)
+ break;
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(msecs_to_jiffies(100));
+ }
+
+ if (dev_state != FIT_SR_DRIVE_INIT)
+ dev_err(&skdev->pdev->dev, "%s state error 0x%02x\n", __func__,
+ dev_state);
+}
+
+/* assume spinlock is held */
+static void skd_restart_device(struct skd_device *skdev)
+{
+ u32 state;
+
+ /* ack all ghost interrupts */
+ SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
+
+ state = SKD_READL(skdev, FIT_STATUS);
+
+ dev_dbg(&skdev->pdev->dev, "drive status=0x%x\n", state);
+
+ state &= FIT_SR_DRIVE_STATE_MASK;
+ skdev->drive_state = state;
+ skdev->last_mtd = 0;
+
+ skdev->state = SKD_DRVR_STATE_RESTARTING;
+ skdev->timer_countdown = SKD_RESTARTING_TIMO;
+
+ skd_soft_reset(skdev);
+}
+
+/* assume spinlock is held */
+static int skd_quiesce_dev(struct skd_device *skdev)
+{
+ int rc = 0;
+
+ switch (skdev->state) {
+ case SKD_DRVR_STATE_BUSY:
+ case SKD_DRVR_STATE_BUSY_IMMINENT:
+ dev_dbg(&skdev->pdev->dev, "stopping queue\n");
+ blk_mq_stop_hw_queues(skdev->queue);
+ break;
+ case SKD_DRVR_STATE_ONLINE:
+ case SKD_DRVR_STATE_STOPPING:
+ case SKD_DRVR_STATE_SYNCING:
+ case SKD_DRVR_STATE_PAUSING:
+ case SKD_DRVR_STATE_PAUSED:
+ case SKD_DRVR_STATE_STARTING:
+ case SKD_DRVR_STATE_RESTARTING:
+ case SKD_DRVR_STATE_RESUMING:
+ default:
+ rc = -EINVAL;
+ dev_dbg(&skdev->pdev->dev, "state [%d] not implemented\n",
+ skdev->state);
+ }
+ return rc;
+}
+
+/* assume spinlock is held */
+static int skd_unquiesce_dev(struct skd_device *skdev)
+{
+ int prev_driver_state = skdev->state;
+
+ skd_log_skdev(skdev, "unquiesce");
+ if (skdev->state == SKD_DRVR_STATE_ONLINE) {
+ dev_dbg(&skdev->pdev->dev, "**** device already ONLINE\n");
+ return 0;
+ }
+ if (skdev->drive_state != FIT_SR_DRIVE_ONLINE) {
+ /*
+ * If there has been an state change to other than
+ * ONLINE, we will rely on controller state change
+ * to come back online and restart the queue.
+ * The BUSY state means that driver is ready to
+ * continue normal processing but waiting for controller
+ * to become available.
+ */
+ skdev->state = SKD_DRVR_STATE_BUSY;
+ dev_dbg(&skdev->pdev->dev, "drive BUSY state\n");
+ return 0;
+ }
+
+ /*
+ * Drive has just come online, driver is either in startup,
+ * paused performing a task, or bust waiting for hardware.
+ */
+ switch (skdev->state) {
+ case SKD_DRVR_STATE_PAUSED:
+ case SKD_DRVR_STATE_BUSY:
+ case SKD_DRVR_STATE_BUSY_IMMINENT:
+ case SKD_DRVR_STATE_BUSY_ERASE:
+ case SKD_DRVR_STATE_STARTING:
+ case SKD_DRVR_STATE_RESTARTING:
+ case SKD_DRVR_STATE_FAULT:
+ case SKD_DRVR_STATE_IDLE:
+ case SKD_DRVR_STATE_LOAD:
+ skdev->state = SKD_DRVR_STATE_ONLINE;
+ dev_err(&skdev->pdev->dev, "Driver state %s(%d)=>%s(%d)\n",
+ skd_skdev_state_to_str(prev_driver_state),
+ prev_driver_state, skd_skdev_state_to_str(skdev->state),
+ skdev->state);
+ dev_dbg(&skdev->pdev->dev,
+ "**** device ONLINE...starting block queue\n");
+ dev_dbg(&skdev->pdev->dev, "starting queue\n");
+ dev_info(&skdev->pdev->dev, "STEC s1120 ONLINE\n");
+ schedule_work(&skdev->start_queue);
+ skdev->gendisk_on = 1;
+ wake_up_interruptible(&skdev->waitq);
+ break;
+
+ case SKD_DRVR_STATE_DISAPPEARED:
+ default:
+ dev_dbg(&skdev->pdev->dev,
+ "**** driver state %d, not implemented\n",
+ skdev->state);
+ return -EBUSY;
+ }
+ return 0;
+}
+
+/*
+ *****************************************************************************
+ * PCIe MSI/MSI-X INTERRUPT HANDLERS
+ *****************************************************************************
+ */
+
+static irqreturn_t skd_reserved_isr(int irq, void *skd_host_data)
+{
+ struct skd_device *skdev = skd_host_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
+ SKD_READL(skdev, FIT_INT_STATUS_HOST));
+ dev_err(&skdev->pdev->dev, "MSIX reserved irq %d = 0x%x\n", irq,
+ SKD_READL(skdev, FIT_INT_STATUS_HOST));
+ SKD_WRITEL(skdev, FIT_INT_RESERVED_MASK, FIT_INT_STATUS_HOST);
+ spin_unlock_irqrestore(&skdev->lock, flags);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t skd_statec_isr(int irq, void *skd_host_data)
+{
+ struct skd_device *skdev = skd_host_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
+ SKD_READL(skdev, FIT_INT_STATUS_HOST));
+ SKD_WRITEL(skdev, FIT_ISH_FW_STATE_CHANGE, FIT_INT_STATUS_HOST);
+ skd_isr_fwstate(skdev);
+ spin_unlock_irqrestore(&skdev->lock, flags);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t skd_comp_q(int irq, void *skd_host_data)
+{
+ struct skd_device *skdev = skd_host_data;
+ unsigned long flags;
+ int flush_enqueued = 0;
+ int deferred;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
+ SKD_READL(skdev, FIT_INT_STATUS_HOST));
+ SKD_WRITEL(skdev, FIT_ISH_COMPLETION_POSTED, FIT_INT_STATUS_HOST);
+ deferred = skd_isr_completion_posted(skdev, skd_isr_comp_limit,
+ &flush_enqueued);
+ if (flush_enqueued)
+ schedule_work(&skdev->start_queue);
+
+ if (deferred)
+ schedule_work(&skdev->completion_worker);
+ else if (!flush_enqueued)
+ schedule_work(&skdev->start_queue);
+
+ spin_unlock_irqrestore(&skdev->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t skd_msg_isr(int irq, void *skd_host_data)
+{
+ struct skd_device *skdev = skd_host_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
+ SKD_READL(skdev, FIT_INT_STATUS_HOST));
+ SKD_WRITEL(skdev, FIT_ISH_MSG_FROM_DEV, FIT_INT_STATUS_HOST);
+ skd_isr_msg_from_dev(skdev);
+ spin_unlock_irqrestore(&skdev->lock, flags);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t skd_qfull_isr(int irq, void *skd_host_data)
+{
+ struct skd_device *skdev = skd_host_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n",
+ SKD_READL(skdev, FIT_INT_STATUS_HOST));
+ SKD_WRITEL(skdev, FIT_INT_QUEUE_FULL, FIT_INT_STATUS_HOST);
+ spin_unlock_irqrestore(&skdev->lock, flags);
+ return IRQ_HANDLED;
+}
+
+/*
+ *****************************************************************************
+ * PCIe MSI/MSI-X SETUP
+ *****************************************************************************
+ */
+
+struct skd_msix_entry {
+ char isr_name[30];
+};
+
+struct skd_init_msix_entry {
+ const char *name;
+ irq_handler_t handler;
+};
+
+#define SKD_MAX_MSIX_COUNT 13
+#define SKD_MIN_MSIX_COUNT 7
+#define SKD_BASE_MSIX_IRQ 4
+
+static struct skd_init_msix_entry msix_entries[SKD_MAX_MSIX_COUNT] = {
+ { "(DMA 0)", skd_reserved_isr },
+ { "(DMA 1)", skd_reserved_isr },
+ { "(DMA 2)", skd_reserved_isr },
+ { "(DMA 3)", skd_reserved_isr },
+ { "(State Change)", skd_statec_isr },
+ { "(COMPL_Q)", skd_comp_q },
+ { "(MSG)", skd_msg_isr },
+ { "(Reserved)", skd_reserved_isr },
+ { "(Reserved)", skd_reserved_isr },
+ { "(Queue Full 0)", skd_qfull_isr },
+ { "(Queue Full 1)", skd_qfull_isr },
+ { "(Queue Full 2)", skd_qfull_isr },
+ { "(Queue Full 3)", skd_qfull_isr },
+};
+
+static int skd_acquire_msix(struct skd_device *skdev)
+{
+ int i, rc;
+ struct pci_dev *pdev = skdev->pdev;
+
+ rc = pci_alloc_irq_vectors(pdev, SKD_MAX_MSIX_COUNT, SKD_MAX_MSIX_COUNT,
+ PCI_IRQ_MSIX);
+ if (rc < 0) {
+ dev_err(&skdev->pdev->dev, "failed to enable MSI-X %d\n", rc);
+ goto out;
+ }
+
+ skdev->msix_entries = kcalloc(SKD_MAX_MSIX_COUNT,
+ sizeof(struct skd_msix_entry), GFP_KERNEL);
+ if (!skdev->msix_entries) {
+ rc = -ENOMEM;
+ dev_err(&skdev->pdev->dev, "msix table allocation error\n");
+ goto out;
+ }
+
+ /* Enable MSI-X vectors for the base queue */
+ for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) {
+ struct skd_msix_entry *qentry = &skdev->msix_entries[i];
+
+ snprintf(qentry->isr_name, sizeof(qentry->isr_name),
+ "%s%d-msix %s", DRV_NAME, skdev->devno,
+ msix_entries[i].name);
+
+ rc = devm_request_irq(&skdev->pdev->dev,
+ pci_irq_vector(skdev->pdev, i),
+ msix_entries[i].handler, 0,
+ qentry->isr_name, skdev);
+ if (rc) {
+ dev_err(&skdev->pdev->dev,
+ "Unable to register(%d) MSI-X handler %d: %s\n",
+ rc, i, qentry->isr_name);
+ goto msix_out;
+ }
+ }
+
+ dev_dbg(&skdev->pdev->dev, "%d msix irq(s) enabled\n",
+ SKD_MAX_MSIX_COUNT);
+ return 0;
+
+msix_out:
+ while (--i >= 0)
+ devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i), skdev);
+out:
+ kfree(skdev->msix_entries);
+ skdev->msix_entries = NULL;
+ return rc;
+}
+
+static int skd_acquire_irq(struct skd_device *skdev)
+{
+ struct pci_dev *pdev = skdev->pdev;
+ unsigned int irq_flag = PCI_IRQ_LEGACY;
+ int rc;
+
+ if (skd_isr_type == SKD_IRQ_MSIX) {
+ rc = skd_acquire_msix(skdev);
+ if (!rc)
+ return 0;
+
+ dev_err(&skdev->pdev->dev,
+ "failed to enable MSI-X, re-trying with MSI %d\n", rc);
+ }
+
+ snprintf(skdev->isr_name, sizeof(skdev->isr_name), "%s%d", DRV_NAME,
+ skdev->devno);
+
+ if (skd_isr_type != SKD_IRQ_LEGACY)
+ irq_flag |= PCI_IRQ_MSI;
+ rc = pci_alloc_irq_vectors(pdev, 1, 1, irq_flag);
+ if (rc < 0) {
+ dev_err(&skdev->pdev->dev,
+ "failed to allocate the MSI interrupt %d\n", rc);
+ return rc;
+ }
+
+ rc = devm_request_irq(&pdev->dev, pdev->irq, skd_isr,
+ pdev->msi_enabled ? 0 : IRQF_SHARED,
+ skdev->isr_name, skdev);
+ if (rc) {
+ pci_free_irq_vectors(pdev);
+ dev_err(&skdev->pdev->dev, "failed to allocate interrupt %d\n",
+ rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+static void skd_release_irq(struct skd_device *skdev)
+{
+ struct pci_dev *pdev = skdev->pdev;
+
+ if (skdev->msix_entries) {
+ int i;
+
+ for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) {
+ devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i),
+ skdev);
+ }
+
+ kfree(skdev->msix_entries);
+ skdev->msix_entries = NULL;
+ } else {
+ devm_free_irq(&pdev->dev, pdev->irq, skdev);
+ }
+
+ pci_free_irq_vectors(pdev);
+}
+
+/*
+ *****************************************************************************
+ * CONSTRUCT
+ *****************************************************************************
+ */
+
+static void *skd_alloc_dma(struct skd_device *skdev, struct kmem_cache *s,
+ dma_addr_t *dma_handle, gfp_t gfp,
+ enum dma_data_direction dir)
+{
+ struct device *dev = &skdev->pdev->dev;
+ void *buf;
+
+ buf = kmem_cache_alloc(s, gfp);
+ if (!buf)
+ return NULL;
+ *dma_handle = dma_map_single(dev, buf,
+ kmem_cache_size(s), dir);
+ if (dma_mapping_error(dev, *dma_handle)) {
+ kmem_cache_free(s, buf);
+ buf = NULL;
+ }
+ return buf;
+}
+
+static void skd_free_dma(struct skd_device *skdev, struct kmem_cache *s,
+ void *vaddr, dma_addr_t dma_handle,
+ enum dma_data_direction dir)
+{
+ if (!vaddr)
+ return;
+
+ dma_unmap_single(&skdev->pdev->dev, dma_handle,
+ kmem_cache_size(s), dir);
+ kmem_cache_free(s, vaddr);
+}
+
+static int skd_cons_skcomp(struct skd_device *skdev)
+{
+ int rc = 0;
+ struct fit_completion_entry_v1 *skcomp;
+
+ dev_dbg(&skdev->pdev->dev,
+ "comp pci_alloc, total bytes %zd entries %d\n",
+ SKD_SKCOMP_SIZE, SKD_N_COMPLETION_ENTRY);
+
+ skcomp = pci_zalloc_consistent(skdev->pdev, SKD_SKCOMP_SIZE,
+ &skdev->cq_dma_address);
+
+ if (skcomp == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ skdev->skcomp_table = skcomp;
+ skdev->skerr_table = (struct fit_comp_error_info *)((char *)skcomp +
+ sizeof(*skcomp) *
+ SKD_N_COMPLETION_ENTRY);
+
+err_out:
+ return rc;
+}
+
+static int skd_cons_skmsg(struct skd_device *skdev)
+{
+ int rc = 0;
+ u32 i;
+
+ dev_dbg(&skdev->pdev->dev,
+ "skmsg_table kcalloc, struct %lu, count %u total %lu\n",
+ sizeof(struct skd_fitmsg_context), skdev->num_fitmsg_context,
+ sizeof(struct skd_fitmsg_context) * skdev->num_fitmsg_context);
+
+ skdev->skmsg_table = kcalloc(skdev->num_fitmsg_context,
+ sizeof(struct skd_fitmsg_context),
+ GFP_KERNEL);
+ if (skdev->skmsg_table == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ for (i = 0; i < skdev->num_fitmsg_context; i++) {
+ struct skd_fitmsg_context *skmsg;
+
+ skmsg = &skdev->skmsg_table[i];
+
+ skmsg->id = i + SKD_ID_FIT_MSG;
+
+ skmsg->msg_buf = pci_alloc_consistent(skdev->pdev,
+ SKD_N_FITMSG_BYTES,
+ &skmsg->mb_dma_address);
+
+ if (skmsg->msg_buf == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ WARN(((uintptr_t)skmsg->msg_buf | skmsg->mb_dma_address) &
+ (FIT_QCMD_ALIGN - 1),
+ "not aligned: msg_buf %p mb_dma_address %pad\n",
+ skmsg->msg_buf, &skmsg->mb_dma_address);
+ memset(skmsg->msg_buf, 0, SKD_N_FITMSG_BYTES);
+ }
+
+err_out:
+ return rc;
+}
+
+static struct fit_sg_descriptor *skd_cons_sg_list(struct skd_device *skdev,
+ u32 n_sg,
+ dma_addr_t *ret_dma_addr)
+{
+ struct fit_sg_descriptor *sg_list;
+
+ sg_list = skd_alloc_dma(skdev, skdev->sglist_cache, ret_dma_addr,
+ GFP_DMA | __GFP_ZERO, DMA_TO_DEVICE);
+
+ if (sg_list != NULL) {
+ uint64_t dma_address = *ret_dma_addr;
+ u32 i;
+
+ for (i = 0; i < n_sg - 1; i++) {
+ uint64_t ndp_off;
+ ndp_off = (i + 1) * sizeof(struct fit_sg_descriptor);
+
+ sg_list[i].next_desc_ptr = dma_address + ndp_off;
+ }
+ sg_list[i].next_desc_ptr = 0LL;
+ }
+
+ return sg_list;
+}
+
+static void skd_free_sg_list(struct skd_device *skdev,
+ struct fit_sg_descriptor *sg_list,
+ dma_addr_t dma_addr)
+{
+ if (WARN_ON_ONCE(!sg_list))
+ return;
+
+ skd_free_dma(skdev, skdev->sglist_cache, sg_list, dma_addr,
+ DMA_TO_DEVICE);
+}
+
+static int skd_init_request(struct blk_mq_tag_set *set, struct request *rq,
+ unsigned int hctx_idx, unsigned int numa_node)
+{
+ struct skd_device *skdev = set->driver_data;
+ struct skd_request_context *skreq = blk_mq_rq_to_pdu(rq);
+
+ skreq->state = SKD_REQ_STATE_IDLE;
+ skreq->sg = (void *)(skreq + 1);
+ sg_init_table(skreq->sg, skd_sgs_per_request);
+ skreq->sksg_list = skd_cons_sg_list(skdev, skd_sgs_per_request,
+ &skreq->sksg_dma_address);
+
+ return skreq->sksg_list ? 0 : -ENOMEM;
+}
+
+static void skd_exit_request(struct blk_mq_tag_set *set, struct request *rq,
+ unsigned int hctx_idx)
+{
+ struct skd_device *skdev = set->driver_data;
+ struct skd_request_context *skreq = blk_mq_rq_to_pdu(rq);
+
+ skd_free_sg_list(skdev, skreq->sksg_list, skreq->sksg_dma_address);
+}
+
+static int skd_cons_sksb(struct skd_device *skdev)
+{
+ int rc = 0;
+ struct skd_special_context *skspcl;
+
+ skspcl = &skdev->internal_skspcl;
+
+ skspcl->req.id = 0 + SKD_ID_INTERNAL;
+ skspcl->req.state = SKD_REQ_STATE_IDLE;
+
+ skspcl->data_buf = skd_alloc_dma(skdev, skdev->databuf_cache,
+ &skspcl->db_dma_address,
+ GFP_DMA | __GFP_ZERO,
+ DMA_BIDIRECTIONAL);
+ if (skspcl->data_buf == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ skspcl->msg_buf = skd_alloc_dma(skdev, skdev->msgbuf_cache,
+ &skspcl->mb_dma_address,
+ GFP_DMA | __GFP_ZERO, DMA_TO_DEVICE);
+ if (skspcl->msg_buf == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ skspcl->req.sksg_list = skd_cons_sg_list(skdev, 1,
+ &skspcl->req.sksg_dma_address);
+ if (skspcl->req.sksg_list == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ if (!skd_format_internal_skspcl(skdev)) {
+ rc = -EINVAL;
+ goto err_out;
+ }
+
+err_out:
+ return rc;
+}
+
+static const struct blk_mq_ops skd_mq_ops = {
+ .queue_rq = skd_mq_queue_rq,
+ .complete = skd_complete_rq,
+ .timeout = skd_timed_out,
+ .init_request = skd_init_request,
+ .exit_request = skd_exit_request,
+};
+
+static int skd_cons_disk(struct skd_device *skdev)
+{
+ int rc = 0;
+ struct gendisk *disk;
+ struct request_queue *q;
+ unsigned long flags;
+
+ disk = alloc_disk(SKD_MINORS_PER_DEVICE);
+ if (!disk) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ skdev->disk = disk;
+ sprintf(disk->disk_name, DRV_NAME "%u", skdev->devno);
+
+ disk->major = skdev->major;
+ disk->first_minor = skdev->devno * SKD_MINORS_PER_DEVICE;
+ disk->fops = &skd_blockdev_ops;
+ disk->private_data = skdev;
+
+ memset(&skdev->tag_set, 0, sizeof(skdev->tag_set));
+ skdev->tag_set.ops = &skd_mq_ops;
+ skdev->tag_set.nr_hw_queues = 1;
+ skdev->tag_set.queue_depth = skd_max_queue_depth;
+ skdev->tag_set.cmd_size = sizeof(struct skd_request_context) +
+ skdev->sgs_per_request * sizeof(struct scatterlist);
+ skdev->tag_set.numa_node = NUMA_NO_NODE;
+ skdev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE |
+ BLK_MQ_F_SG_MERGE |
+ BLK_ALLOC_POLICY_TO_MQ_FLAG(BLK_TAG_ALLOC_FIFO);
+ skdev->tag_set.driver_data = skdev;
+ rc = blk_mq_alloc_tag_set(&skdev->tag_set);
+ if (rc)
+ goto err_out;
+ q = blk_mq_init_queue(&skdev->tag_set);
+ if (IS_ERR(q)) {
+ blk_mq_free_tag_set(&skdev->tag_set);
+ rc = PTR_ERR(q);
+ goto err_out;
+ }
+ q->queuedata = skdev;
+
+ skdev->queue = q;
+ disk->queue = q;
+
+ blk_queue_write_cache(q, true, true);
+ blk_queue_max_segments(q, skdev->sgs_per_request);
+ blk_queue_max_hw_sectors(q, SKD_N_MAX_SECTORS);
+
+ /* set optimal I/O size to 8KB */
+ blk_queue_io_opt(q, 8192);
+
+ blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
+ blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
+
+ blk_queue_rq_timeout(q, 8 * HZ);
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ dev_dbg(&skdev->pdev->dev, "stopping queue\n");
+ blk_mq_stop_hw_queues(skdev->queue);
+ spin_unlock_irqrestore(&skdev->lock, flags);
+
+err_out:
+ return rc;
+}
+
+#define SKD_N_DEV_TABLE 16u
+static u32 skd_next_devno;
+
+static struct skd_device *skd_construct(struct pci_dev *pdev)
+{
+ struct skd_device *skdev;
+ int blk_major = skd_major;
+ size_t size;
+ int rc;
+
+ skdev = kzalloc(sizeof(*skdev), GFP_KERNEL);
+
+ if (!skdev) {
+ dev_err(&pdev->dev, "memory alloc failure\n");
+ return NULL;
+ }
+
+ skdev->state = SKD_DRVR_STATE_LOAD;
+ skdev->pdev = pdev;
+ skdev->devno = skd_next_devno++;
+ skdev->major = blk_major;
+ skdev->dev_max_queue_depth = 0;
+
+ skdev->num_req_context = skd_max_queue_depth;
+ skdev->num_fitmsg_context = skd_max_queue_depth;
+ skdev->cur_max_queue_depth = 1;
+ skdev->queue_low_water_mark = 1;
+ skdev->proto_ver = 99;
+ skdev->sgs_per_request = skd_sgs_per_request;
+ skdev->dbg_level = skd_dbg_level;
+
+ spin_lock_init(&skdev->lock);
+
+ INIT_WORK(&skdev->start_queue, skd_start_queue);
+ INIT_WORK(&skdev->completion_worker, skd_completion_worker);
+
+ size = max(SKD_N_FITMSG_BYTES, SKD_N_SPECIAL_FITMSG_BYTES);
+ skdev->msgbuf_cache = kmem_cache_create("skd-msgbuf", size, 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!skdev->msgbuf_cache)
+ goto err_out;
+ WARN_ONCE(kmem_cache_size(skdev->msgbuf_cache) < size,
+ "skd-msgbuf: %d < %zd\n",
+ kmem_cache_size(skdev->msgbuf_cache), size);
+ size = skd_sgs_per_request * sizeof(struct fit_sg_descriptor);
+ skdev->sglist_cache = kmem_cache_create("skd-sglist", size, 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!skdev->sglist_cache)
+ goto err_out;
+ WARN_ONCE(kmem_cache_size(skdev->sglist_cache) < size,
+ "skd-sglist: %d < %zd\n",
+ kmem_cache_size(skdev->sglist_cache), size);
+ size = SKD_N_INTERNAL_BYTES;
+ skdev->databuf_cache = kmem_cache_create("skd-databuf", size, 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!skdev->databuf_cache)
+ goto err_out;
+ WARN_ONCE(kmem_cache_size(skdev->databuf_cache) < size,
+ "skd-databuf: %d < %zd\n",
+ kmem_cache_size(skdev->databuf_cache), size);
+
+ dev_dbg(&skdev->pdev->dev, "skcomp\n");
+ rc = skd_cons_skcomp(skdev);
+ if (rc < 0)
+ goto err_out;
+
+ dev_dbg(&skdev->pdev->dev, "skmsg\n");
+ rc = skd_cons_skmsg(skdev);
+ if (rc < 0)
+ goto err_out;
+
+ dev_dbg(&skdev->pdev->dev, "sksb\n");
+ rc = skd_cons_sksb(skdev);
+ if (rc < 0)
+ goto err_out;
+
+ dev_dbg(&skdev->pdev->dev, "disk\n");
+ rc = skd_cons_disk(skdev);
+ if (rc < 0)
+ goto err_out;
+
+ dev_dbg(&skdev->pdev->dev, "VICTORY\n");
+ return skdev;
+
+err_out:
+ dev_dbg(&skdev->pdev->dev, "construct failed\n");
+ skd_destruct(skdev);
+ return NULL;
+}
+
+/*
+ *****************************************************************************
+ * DESTRUCT (FREE)
+ *****************************************************************************
+ */
+
+static void skd_free_skcomp(struct skd_device *skdev)
+{
+ if (skdev->skcomp_table)
+ pci_free_consistent(skdev->pdev, SKD_SKCOMP_SIZE,
+ skdev->skcomp_table, skdev->cq_dma_address);
+
+ skdev->skcomp_table = NULL;
+ skdev->cq_dma_address = 0;
+}
+
+static void skd_free_skmsg(struct skd_device *skdev)
+{
+ u32 i;
+
+ if (skdev->skmsg_table == NULL)
+ return;
+
+ for (i = 0; i < skdev->num_fitmsg_context; i++) {
+ struct skd_fitmsg_context *skmsg;
+
+ skmsg = &skdev->skmsg_table[i];
+
+ if (skmsg->msg_buf != NULL) {
+ pci_free_consistent(skdev->pdev, SKD_N_FITMSG_BYTES,
+ skmsg->msg_buf,
+ skmsg->mb_dma_address);
+ }
+ skmsg->msg_buf = NULL;
+ skmsg->mb_dma_address = 0;
+ }
+
+ kfree(skdev->skmsg_table);
+ skdev->skmsg_table = NULL;
+}
+
+static void skd_free_sksb(struct skd_device *skdev)
+{
+ struct skd_special_context *skspcl = &skdev->internal_skspcl;
+
+ skd_free_dma(skdev, skdev->databuf_cache, skspcl->data_buf,
+ skspcl->db_dma_address, DMA_BIDIRECTIONAL);
+
+ skspcl->data_buf = NULL;
+ skspcl->db_dma_address = 0;
+
+ skd_free_dma(skdev, skdev->msgbuf_cache, skspcl->msg_buf,
+ skspcl->mb_dma_address, DMA_TO_DEVICE);
+
+ skspcl->msg_buf = NULL;
+ skspcl->mb_dma_address = 0;
+
+ skd_free_sg_list(skdev, skspcl->req.sksg_list,
+ skspcl->req.sksg_dma_address);
+
+ skspcl->req.sksg_list = NULL;
+ skspcl->req.sksg_dma_address = 0;
+}
+
+static void skd_free_disk(struct skd_device *skdev)
+{
+ struct gendisk *disk = skdev->disk;
+
+ if (disk && (disk->flags & GENHD_FL_UP))
+ del_gendisk(disk);
+
+ if (skdev->queue) {
+ blk_cleanup_queue(skdev->queue);
+ skdev->queue = NULL;
+ if (disk)
+ disk->queue = NULL;
+ }
+
+ if (skdev->tag_set.tags)
+ blk_mq_free_tag_set(&skdev->tag_set);
+
+ put_disk(disk);
+ skdev->disk = NULL;
+}
+
+static void skd_destruct(struct skd_device *skdev)
+{
+ if (skdev == NULL)
+ return;
+
+ cancel_work_sync(&skdev->start_queue);
+
+ dev_dbg(&skdev->pdev->dev, "disk\n");
+ skd_free_disk(skdev);
+
+ dev_dbg(&skdev->pdev->dev, "sksb\n");
+ skd_free_sksb(skdev);
+
+ dev_dbg(&skdev->pdev->dev, "skmsg\n");
+ skd_free_skmsg(skdev);
+
+ dev_dbg(&skdev->pdev->dev, "skcomp\n");
+ skd_free_skcomp(skdev);
+
+ kmem_cache_destroy(skdev->databuf_cache);
+ kmem_cache_destroy(skdev->sglist_cache);
+ kmem_cache_destroy(skdev->msgbuf_cache);
+
+ dev_dbg(&skdev->pdev->dev, "skdev\n");
+ kfree(skdev);
+}
+
+/*
+ *****************************************************************************
+ * BLOCK DEVICE (BDEV) GLUE
+ *****************************************************************************
+ */
+
+static int skd_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+ struct skd_device *skdev;
+ u64 capacity;
+
+ skdev = bdev->bd_disk->private_data;
+
+ dev_dbg(&skdev->pdev->dev, "%s: CMD[%s] getgeo device\n",
+ bdev->bd_disk->disk_name, current->comm);
+
+ if (skdev->read_cap_is_valid) {
+ capacity = get_capacity(skdev->disk);
+ geo->heads = 64;
+ geo->sectors = 255;
+ geo->cylinders = (capacity) / (255 * 64);
+
+ return 0;
+ }
+ return -EIO;
+}
+
+static int skd_bdev_attach(struct device *parent, struct skd_device *skdev)
+{
+ dev_dbg(&skdev->pdev->dev, "add_disk\n");
+ device_add_disk(parent, skdev->disk);
+ return 0;
+}
+
+static const struct block_device_operations skd_blockdev_ops = {
+ .owner = THIS_MODULE,
+ .getgeo = skd_bdev_getgeo,
+};
+
+/*
+ *****************************************************************************
+ * PCIe DRIVER GLUE
+ *****************************************************************************
+ */
+
+static const struct pci_device_id skd_pci_tbl[] = {
+ { PCI_VENDOR_ID_STEC, PCI_DEVICE_ID_S1120,
+ PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
+ { 0 } /* terminate list */
+};
+
+MODULE_DEVICE_TABLE(pci, skd_pci_tbl);
+
+static char *skd_pci_info(struct skd_device *skdev, char *str)
+{
+ int pcie_reg;
+
+ strcpy(str, "PCIe (");
+ pcie_reg = pci_find_capability(skdev->pdev, PCI_CAP_ID_EXP);
+
+ if (pcie_reg) {
+
+ char lwstr[6];
+ uint16_t pcie_lstat, lspeed, lwidth;
+
+ pcie_reg += 0x12;
+ pci_read_config_word(skdev->pdev, pcie_reg, &pcie_lstat);
+ lspeed = pcie_lstat & (0xF);
+ lwidth = (pcie_lstat & 0x3F0) >> 4;
+
+ if (lspeed == 1)
+ strcat(str, "2.5GT/s ");
+ else if (lspeed == 2)
+ strcat(str, "5.0GT/s ");
+ else
+ strcat(str, "<unknown> ");
+ snprintf(lwstr, sizeof(lwstr), "%dX)", lwidth);
+ strcat(str, lwstr);
+ }
+ return str;
+}
+
+static int skd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+ int i;
+ int rc = 0;
+ char pci_str[32];
+ struct skd_device *skdev;
+
+ dev_dbg(&pdev->dev, "vendor=%04X device=%04x\n", pdev->vendor,
+ pdev->device);
+
+ rc = pci_enable_device(pdev);
+ if (rc)
+ return rc;
+ rc = pci_request_regions(pdev, DRV_NAME);
+ if (rc)
+ goto err_out;
+ rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
+ if (!rc) {
+ if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) {
+ dev_err(&pdev->dev, "consistent DMA mask error %d\n",
+ rc);
+ }
+ } else {
+ rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+ if (rc) {
+ dev_err(&pdev->dev, "DMA mask error %d\n", rc);
+ goto err_out_regions;
+ }
+ }
+
+ if (!skd_major) {
+ rc = register_blkdev(0, DRV_NAME);
+ if (rc < 0)
+ goto err_out_regions;
+ BUG_ON(!rc);
+ skd_major = rc;
+ }
+
+ skdev = skd_construct(pdev);
+ if (skdev == NULL) {
+ rc = -ENOMEM;
+ goto err_out_regions;
+ }
+
+ skd_pci_info(skdev, pci_str);
+ dev_info(&pdev->dev, "%s 64bit\n", pci_str);
+
+ pci_set_master(pdev);
+ rc = pci_enable_pcie_error_reporting(pdev);
+ if (rc) {
+ dev_err(&pdev->dev,
+ "bad enable of PCIe error reporting rc=%d\n", rc);
+ skdev->pcie_error_reporting_is_enabled = 0;
+ } else
+ skdev->pcie_error_reporting_is_enabled = 1;
+
+ pci_set_drvdata(pdev, skdev);
+
+ for (i = 0; i < SKD_MAX_BARS; i++) {
+ skdev->mem_phys[i] = pci_resource_start(pdev, i);
+ skdev->mem_size[i] = (u32)pci_resource_len(pdev, i);
+ skdev->mem_map[i] = ioremap(skdev->mem_phys[i],
+ skdev->mem_size[i]);
+ if (!skdev->mem_map[i]) {
+ dev_err(&pdev->dev,
+ "Unable to map adapter memory!\n");
+ rc = -ENODEV;
+ goto err_out_iounmap;
+ }
+ dev_dbg(&pdev->dev, "mem_map=%p, phyd=%016llx, size=%d\n",
+ skdev->mem_map[i], (uint64_t)skdev->mem_phys[i],
+ skdev->mem_size[i]);
+ }
+
+ rc = skd_acquire_irq(skdev);
+ if (rc) {
+ dev_err(&pdev->dev, "interrupt resource error %d\n", rc);
+ goto err_out_iounmap;
+ }
+
+ rc = skd_start_timer(skdev);
+ if (rc)
+ goto err_out_timer;
+
+ init_waitqueue_head(&skdev->waitq);
+
+ skd_start_device(skdev);
+
+ rc = wait_event_interruptible_timeout(skdev->waitq,
+ (skdev->gendisk_on),
+ (SKD_START_WAIT_SECONDS * HZ));
+ if (skdev->gendisk_on > 0) {
+ /* device came on-line after reset */
+ skd_bdev_attach(&pdev->dev, skdev);
+ rc = 0;
+ } else {
+ /* we timed out, something is wrong with the device,
+ don't add the disk structure */
+ dev_err(&pdev->dev, "error: waiting for s1120 timed out %d!\n",
+ rc);
+ /* in case of no error; we timeout with ENXIO */
+ if (!rc)
+ rc = -ENXIO;
+ goto err_out_timer;
+ }
+
+ return rc;
+
+err_out_timer:
+ skd_stop_device(skdev);
+ skd_release_irq(skdev);
+
+err_out_iounmap:
+ for (i = 0; i < SKD_MAX_BARS; i++)
+ if (skdev->mem_map[i])
+ iounmap(skdev->mem_map[i]);
+
+ if (skdev->pcie_error_reporting_is_enabled)
+ pci_disable_pcie_error_reporting(pdev);
+
+ skd_destruct(skdev);
+
+err_out_regions:
+ pci_release_regions(pdev);
+
+err_out:
+ pci_disable_device(pdev);
+ pci_set_drvdata(pdev, NULL);
+ return rc;
+}
+
+static void skd_pci_remove(struct pci_dev *pdev)
+{
+ int i;
+ struct skd_device *skdev;
+
+ skdev = pci_get_drvdata(pdev);
+ if (!skdev) {
+ dev_err(&pdev->dev, "no device data for PCI\n");
+ return;
+ }
+ skd_stop_device(skdev);
+ skd_release_irq(skdev);
+
+ for (i = 0; i < SKD_MAX_BARS; i++)
+ if (skdev->mem_map[i])
+ iounmap(skdev->mem_map[i]);
+
+ if (skdev->pcie_error_reporting_is_enabled)
+ pci_disable_pcie_error_reporting(pdev);
+
+ skd_destruct(skdev);
+
+ pci_release_regions(pdev);
+ pci_disable_device(pdev);
+ pci_set_drvdata(pdev, NULL);
+
+ return;
+}
+
+static int skd_pci_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ int i;
+ struct skd_device *skdev;
+
+ skdev = pci_get_drvdata(pdev);
+ if (!skdev) {
+ dev_err(&pdev->dev, "no device data for PCI\n");
+ return -EIO;
+ }
+
+ skd_stop_device(skdev);
+
+ skd_release_irq(skdev);
+
+ for (i = 0; i < SKD_MAX_BARS; i++)
+ if (skdev->mem_map[i])
+ iounmap(skdev->mem_map[i]);
+
+ if (skdev->pcie_error_reporting_is_enabled)
+ pci_disable_pcie_error_reporting(pdev);
+
+ pci_release_regions(pdev);
+ pci_save_state(pdev);
+ pci_disable_device(pdev);
+ pci_set_power_state(pdev, pci_choose_state(pdev, state));
+ return 0;
+}
+
+static int skd_pci_resume(struct pci_dev *pdev)
+{
+ int i;
+ int rc = 0;
+ struct skd_device *skdev;
+
+ skdev = pci_get_drvdata(pdev);
+ if (!skdev) {
+ dev_err(&pdev->dev, "no device data for PCI\n");
+ return -1;
+ }
+
+ pci_set_power_state(pdev, PCI_D0);
+ pci_enable_wake(pdev, PCI_D0, 0);
+ pci_restore_state(pdev);
+
+ rc = pci_enable_device(pdev);
+ if (rc)
+ return rc;
+ rc = pci_request_regions(pdev, DRV_NAME);
+ if (rc)
+ goto err_out;
+ rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
+ if (!rc) {
+ if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) {
+
+ dev_err(&pdev->dev, "consistent DMA mask error %d\n",
+ rc);
+ }
+ } else {
+ rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+ if (rc) {
+
+ dev_err(&pdev->dev, "DMA mask error %d\n", rc);
+ goto err_out_regions;
+ }
+ }
+
+ pci_set_master(pdev);
+ rc = pci_enable_pcie_error_reporting(pdev);
+ if (rc) {
+ dev_err(&pdev->dev,
+ "bad enable of PCIe error reporting rc=%d\n", rc);
+ skdev->pcie_error_reporting_is_enabled = 0;
+ } else
+ skdev->pcie_error_reporting_is_enabled = 1;
+
+ for (i = 0; i < SKD_MAX_BARS; i++) {
+
+ skdev->mem_phys[i] = pci_resource_start(pdev, i);
+ skdev->mem_size[i] = (u32)pci_resource_len(pdev, i);
+ skdev->mem_map[i] = ioremap(skdev->mem_phys[i],
+ skdev->mem_size[i]);
+ if (!skdev->mem_map[i]) {
+ dev_err(&pdev->dev, "Unable to map adapter memory!\n");
+ rc = -ENODEV;
+ goto err_out_iounmap;
+ }
+ dev_dbg(&pdev->dev, "mem_map=%p, phyd=%016llx, size=%d\n",
+ skdev->mem_map[i], (uint64_t)skdev->mem_phys[i],
+ skdev->mem_size[i]);
+ }
+ rc = skd_acquire_irq(skdev);
+ if (rc) {
+ dev_err(&pdev->dev, "interrupt resource error %d\n", rc);
+ goto err_out_iounmap;
+ }
+
+ rc = skd_start_timer(skdev);
+ if (rc)
+ goto err_out_timer;
+
+ init_waitqueue_head(&skdev->waitq);
+
+ skd_start_device(skdev);
+
+ return rc;
+
+err_out_timer:
+ skd_stop_device(skdev);
+ skd_release_irq(skdev);
+
+err_out_iounmap:
+ for (i = 0; i < SKD_MAX_BARS; i++)
+ if (skdev->mem_map[i])
+ iounmap(skdev->mem_map[i]);
+
+ if (skdev->pcie_error_reporting_is_enabled)
+ pci_disable_pcie_error_reporting(pdev);
+
+err_out_regions:
+ pci_release_regions(pdev);
+
+err_out:
+ pci_disable_device(pdev);
+ return rc;
+}
+
+static void skd_pci_shutdown(struct pci_dev *pdev)
+{
+ struct skd_device *skdev;
+
+ dev_err(&pdev->dev, "%s called\n", __func__);
+
+ skdev = pci_get_drvdata(pdev);
+ if (!skdev) {
+ dev_err(&pdev->dev, "no device data for PCI\n");
+ return;
+ }
+
+ dev_err(&pdev->dev, "calling stop\n");
+ skd_stop_device(skdev);
+}
+
+static struct pci_driver skd_driver = {
+ .name = DRV_NAME,
+ .id_table = skd_pci_tbl,
+ .probe = skd_pci_probe,
+ .remove = skd_pci_remove,
+ .suspend = skd_pci_suspend,
+ .resume = skd_pci_resume,
+ .shutdown = skd_pci_shutdown,
+};
+
+/*
+ *****************************************************************************
+ * LOGGING SUPPORT
+ *****************************************************************************
+ */
+
+const char *skd_drive_state_to_str(int state)
+{
+ switch (state) {
+ case FIT_SR_DRIVE_OFFLINE:
+ return "OFFLINE";
+ case FIT_SR_DRIVE_INIT:
+ return "INIT";
+ case FIT_SR_DRIVE_ONLINE:
+ return "ONLINE";
+ case FIT_SR_DRIVE_BUSY:
+ return "BUSY";
+ case FIT_SR_DRIVE_FAULT:
+ return "FAULT";
+ case FIT_SR_DRIVE_DEGRADED:
+ return "DEGRADED";
+ case FIT_SR_PCIE_LINK_DOWN:
+ return "INK_DOWN";
+ case FIT_SR_DRIVE_SOFT_RESET:
+ return "SOFT_RESET";
+ case FIT_SR_DRIVE_NEED_FW_DOWNLOAD:
+ return "NEED_FW";
+ case FIT_SR_DRIVE_INIT_FAULT:
+ return "INIT_FAULT";
+ case FIT_SR_DRIVE_BUSY_SANITIZE:
+ return "BUSY_SANITIZE";
+ case FIT_SR_DRIVE_BUSY_ERASE:
+ return "BUSY_ERASE";
+ case FIT_SR_DRIVE_FW_BOOTING:
+ return "FW_BOOTING";
+ default:
+ return "???";
+ }
+}
+
+const char *skd_skdev_state_to_str(enum skd_drvr_state state)
+{
+ switch (state) {
+ case SKD_DRVR_STATE_LOAD:
+ return "LOAD";
+ case SKD_DRVR_STATE_IDLE:
+ return "IDLE";
+ case SKD_DRVR_STATE_BUSY:
+ return "BUSY";
+ case SKD_DRVR_STATE_STARTING:
+ return "STARTING";
+ case SKD_DRVR_STATE_ONLINE:
+ return "ONLINE";
+ case SKD_DRVR_STATE_PAUSING:
+ return "PAUSING";
+ case SKD_DRVR_STATE_PAUSED:
+ return "PAUSED";
+ case SKD_DRVR_STATE_RESTARTING:
+ return "RESTARTING";
+ case SKD_DRVR_STATE_RESUMING:
+ return "RESUMING";
+ case SKD_DRVR_STATE_STOPPING:
+ return "STOPPING";
+ case SKD_DRVR_STATE_SYNCING:
+ return "SYNCING";
+ case SKD_DRVR_STATE_FAULT:
+ return "FAULT";
+ case SKD_DRVR_STATE_DISAPPEARED:
+ return "DISAPPEARED";
+ case SKD_DRVR_STATE_BUSY_ERASE:
+ return "BUSY_ERASE";
+ case SKD_DRVR_STATE_BUSY_SANITIZE:
+ return "BUSY_SANITIZE";
+ case SKD_DRVR_STATE_BUSY_IMMINENT:
+ return "BUSY_IMMINENT";
+ case SKD_DRVR_STATE_WAIT_BOOT:
+ return "WAIT_BOOT";
+
+ default:
+ return "???";
+ }
+}
+
+static const char *skd_skreq_state_to_str(enum skd_req_state state)
+{
+ switch (state) {
+ case SKD_REQ_STATE_IDLE:
+ return "IDLE";
+ case SKD_REQ_STATE_SETUP:
+ return "SETUP";
+ case SKD_REQ_STATE_BUSY:
+ return "BUSY";
+ case SKD_REQ_STATE_COMPLETED:
+ return "COMPLETED";
+ case SKD_REQ_STATE_TIMEOUT:
+ return "TIMEOUT";
+ default:
+ return "???";
+ }
+}
+
+static void skd_log_skdev(struct skd_device *skdev, const char *event)
+{
+ dev_dbg(&skdev->pdev->dev, "skdev=%p event='%s'\n", skdev, event);
+ dev_dbg(&skdev->pdev->dev, " drive_state=%s(%d) driver_state=%s(%d)\n",
+ skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
+ skd_skdev_state_to_str(skdev->state), skdev->state);
+ dev_dbg(&skdev->pdev->dev, " busy=%d limit=%d dev=%d lowat=%d\n",
+ skd_in_flight(skdev), skdev->cur_max_queue_depth,
+ skdev->dev_max_queue_depth, skdev->queue_low_water_mark);
+ dev_dbg(&skdev->pdev->dev, " cycle=%d cycle_ix=%d\n",
+ skdev->skcomp_cycle, skdev->skcomp_ix);
+}
+
+static void skd_log_skreq(struct skd_device *skdev,
+ struct skd_request_context *skreq, const char *event)
+{
+ struct request *req = blk_mq_rq_from_pdu(skreq);
+ u32 lba = blk_rq_pos(req);
+ u32 count = blk_rq_sectors(req);
+
+ dev_dbg(&skdev->pdev->dev, "skreq=%p event='%s'\n", skreq, event);
+ dev_dbg(&skdev->pdev->dev, " state=%s(%d) id=0x%04x fitmsg=0x%04x\n",
+ skd_skreq_state_to_str(skreq->state), skreq->state, skreq->id,
+ skreq->fitmsg_id);
+ dev_dbg(&skdev->pdev->dev, " sg_dir=%d n_sg=%d\n",
+ skreq->data_dir, skreq->n_sg);
+
+ dev_dbg(&skdev->pdev->dev,
+ "req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n", req, lba, lba,
+ count, count, (int)rq_data_dir(req));
+}
+
+/*
+ *****************************************************************************
+ * MODULE GLUE
+ *****************************************************************************
+ */
+
+static int __init skd_init(void)
+{
+ BUILD_BUG_ON(sizeof(struct fit_completion_entry_v1) != 8);
+ BUILD_BUG_ON(sizeof(struct fit_comp_error_info) != 32);
+ BUILD_BUG_ON(sizeof(struct skd_command_header) != 16);
+ BUILD_BUG_ON(sizeof(struct skd_scsi_request) != 32);
+ BUILD_BUG_ON(sizeof(struct driver_inquiry_data) != 44);
+ BUILD_BUG_ON(offsetof(struct skd_msg_buf, fmh) != 0);
+ BUILD_BUG_ON(offsetof(struct skd_msg_buf, scsi) != 64);
+ BUILD_BUG_ON(sizeof(struct skd_msg_buf) != SKD_N_FITMSG_BYTES);
+
+ switch (skd_isr_type) {
+ case SKD_IRQ_LEGACY:
+ case SKD_IRQ_MSI:
+ case SKD_IRQ_MSIX:
+ break;
+ default:
+ pr_err(PFX "skd_isr_type %d invalid, re-set to %d\n",
+ skd_isr_type, SKD_IRQ_DEFAULT);
+ skd_isr_type = SKD_IRQ_DEFAULT;
+ }
+
+ if (skd_max_queue_depth < 1 ||
+ skd_max_queue_depth > SKD_MAX_QUEUE_DEPTH) {
+ pr_err(PFX "skd_max_queue_depth %d invalid, re-set to %d\n",
+ skd_max_queue_depth, SKD_MAX_QUEUE_DEPTH_DEFAULT);
+ skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT;
+ }
+
+ if (skd_max_req_per_msg < 1 ||
+ skd_max_req_per_msg > SKD_MAX_REQ_PER_MSG) {
+ pr_err(PFX "skd_max_req_per_msg %d invalid, re-set to %d\n",
+ skd_max_req_per_msg, SKD_MAX_REQ_PER_MSG_DEFAULT);
+ skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT;
+ }
+
+ if (skd_sgs_per_request < 1 || skd_sgs_per_request > 4096) {
+ pr_err(PFX "skd_sg_per_request %d invalid, re-set to %d\n",
+ skd_sgs_per_request, SKD_N_SG_PER_REQ_DEFAULT);
+ skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT;
+ }
+
+ if (skd_dbg_level < 0 || skd_dbg_level > 2) {
+ pr_err(PFX "skd_dbg_level %d invalid, re-set to %d\n",
+ skd_dbg_level, 0);
+ skd_dbg_level = 0;
+ }
+
+ if (skd_isr_comp_limit < 0) {
+ pr_err(PFX "skd_isr_comp_limit %d invalid, set to %d\n",
+ skd_isr_comp_limit, 0);
+ skd_isr_comp_limit = 0;
+ }
+
+ return pci_register_driver(&skd_driver);
+}
+
+static void __exit skd_exit(void)
+{
+ pci_unregister_driver(&skd_driver);
+
+ if (skd_major)
+ unregister_blkdev(skd_major, DRV_NAME);
+}
+
+module_init(skd_init);
+module_exit(skd_exit);