drivers/scsi/ufs/ufshcd.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Universal Flash Storage Host controller driver Core
 * Copyright (C) 2011-2013 Samsung India Software Operations
 * Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
 *
 * Authors:
 *	Santosh Yaraganavi <santosh.sy@samsung.com>
 *	Vinayak Holikatti <h.vinayak@samsung.com>
 */

#include <linux/async.h>
#include <linux/devfreq.h>
#include <linux/nls.h>
#include <linux/of.h>
#include <linux/bitfield.h>
#include <linux/blk-pm.h>
#include <linux/blkdev.h>
#include <scsi/scsi_driver.h>
#include "ufshcd.h"
#include "ufs_quirks.h"
#include "unipro.h"
#include "ufs-sysfs.h"
#include "ufs-debugfs.h"
#include "ufs-fault-injection.h"
#include "ufs_bsg.h"
#include "ufshcd-crypto.h"
#include "ufshpb.h"
#include <asm/unaligned.h>

#define CREATE_TRACE_POINTS
#include <trace/events/ufs.h>

#define UFSHCD_ENABLE_INTRS	(UTP_TRANSFER_REQ_COMPL |\
				 UTP_TASK_REQ_COMPL |\
				 UFSHCD_ERROR_MASK)
/* UIC command timeout, unit: ms */
#define UIC_CMD_TIMEOUT	500

/* NOP OUT retries waiting for NOP IN response */
#define NOP_OUT_RETRIES    10
/* Timeout after 50 msecs if NOP OUT hangs without response */
#define NOP_OUT_TIMEOUT    50 /* msecs */

/* Query request retries */
#define QUERY_REQ_RETRIES 3
/* Query request timeout */
#define QUERY_REQ_TIMEOUT 1500 /* 1.5 seconds */

/* Task management command timeout */
#define TM_CMD_TIMEOUT	100 /* msecs */

/* maximum number of retries for a general UIC command  */
#define UFS_UIC_COMMAND_RETRIES 3

/* maximum number of link-startup retries */
#define DME_LINKSTARTUP_RETRIES 3

/* Maximum retries for Hibern8 enter */
#define UIC_HIBERN8_ENTER_RETRIES 3

/* maximum number of reset retries before giving up */
#define MAX_HOST_RESET_RETRIES 5

/* Maximum number of error handler retries before giving up */
#define MAX_ERR_HANDLER_RETRIES 5

/* Expose the flag value from utp_upiu_query.value */
#define MASK_QUERY_UPIU_FLAG_LOC 0xFF

/* Interrupt aggregation default timeout, unit: 40us */
#define INT_AGGR_DEF_TO	0x02

/* default delay of autosuspend: 2000 ms */
#define RPM_AUTOSUSPEND_DELAY_MS 2000

/* Default delay of RPM device flush delayed work */
#define RPM_DEV_FLUSH_RECHECK_WORK_DELAY_MS 5000

/* Default value of wait time before gating device ref clock */
#define UFSHCD_REF_CLK_GATING_WAIT_US 0xFF /* microsecs */

/* Polling time to wait for fDeviceInit */
#define FDEVICEINIT_COMPL_TIMEOUT 1500 /* millisecs */

#define wlun_dev_to_hba(dv) shost_priv(to_scsi_device(dv)->host)

#define ufshcd_toggle_vreg(_dev, _vreg, _on)				\
	({                                                              \
		int _ret;                                               \
		if (_on)                                                \
			_ret = ufshcd_enable_vreg(_dev, _vreg);         \
		else                                                    \
			_ret = ufshcd_disable_vreg(_dev, _vreg);        \
		_ret;                                                   \
	})

#define ufshcd_hex_dump(prefix_str, buf, len) do {                       \
	size_t __len = (len);                                            \
	print_hex_dump(KERN_ERR, prefix_str,                             \
		       __len > 4 ? DUMP_PREFIX_OFFSET : DUMP_PREFIX_NONE,\
		       16, 4, buf, __len, false);                        \
} while (0)

int ufshcd_dump_regs(struct ufs_hba *hba, size_t offset, size_t len,
		     const char *prefix)
{
	u32 *regs;
	size_t pos;

	if (offset % 4 != 0 || len % 4 != 0) /* keep readl happy */
		return -EINVAL;

	regs = kzalloc(len, GFP_ATOMIC);
	if (!regs)
		return -ENOMEM;

	for (pos = 0; pos < len; pos += 4)
		regs[pos / 4] = ufshcd_readl(hba, offset + pos);

	ufshcd_hex_dump(prefix, regs, len);
	kfree(regs);

	return 0;
}
EXPORT_SYMBOL_GPL(ufshcd_dump_regs);

enum {
	UFSHCD_MAX_CHANNEL	= 0,
	UFSHCD_MAX_ID		= 1,
	UFSHCD_CMD_PER_LUN	= 32,
	UFSHCD_CAN_QUEUE	= 32,
};

static const char *const ufshcd_state_name[] = {
	[UFSHCD_STATE_RESET]			= "reset",
	[UFSHCD_STATE_OPERATIONAL]		= "operational",
	[UFSHCD_STATE_ERROR]			= "error",
	[UFSHCD_STATE_EH_SCHEDULED_FATAL]	= "eh_fatal",
	[UFSHCD_STATE_EH_SCHEDULED_NON_FATAL]	= "eh_non_fatal",
};

/* UFSHCD error handling flags */
enum {
	UFSHCD_EH_IN_PROGRESS = (1 << 0),
};

/* UFSHCD UIC layer error flags */
enum {
	UFSHCD_UIC_DL_PA_INIT_ERROR = (1 << 0), /* Data link layer error */
	UFSHCD_UIC_DL_NAC_RECEIVED_ERROR = (1 << 1), /* Data link layer error */
	UFSHCD_UIC_DL_TCx_REPLAY_ERROR = (1 << 2), /* Data link layer error */
	UFSHCD_UIC_NL_ERROR = (1 << 3), /* Network layer error */
	UFSHCD_UIC_TL_ERROR = (1 << 4), /* Transport Layer error */
	UFSHCD_UIC_DME_ERROR = (1 << 5), /* DME error */
	UFSHCD_UIC_PA_GENERIC_ERROR = (1 << 6), /* Generic PA error */
};

#define ufshcd_set_eh_in_progress(h) \
	((h)->eh_flags |= UFSHCD_EH_IN_PROGRESS)
#define ufshcd_eh_in_progress(h) \
	((h)->eh_flags & UFSHCD_EH_IN_PROGRESS)
#define ufshcd_clear_eh_in_progress(h) \
	((h)->eh_flags &= ~UFSHCD_EH_IN_PROGRESS)

struct ufs_pm_lvl_states ufs_pm_lvl_states[] = {
	[UFS_PM_LVL_0] = {UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE},
	[UFS_PM_LVL_1] = {UFS_ACTIVE_PWR_MODE, UIC_LINK_HIBERN8_STATE},
	[UFS_PM_LVL_2] = {UFS_SLEEP_PWR_MODE, UIC_LINK_ACTIVE_STATE},
	[UFS_PM_LVL_3] = {UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE},
	[UFS_PM_LVL_4] = {UFS_POWERDOWN_PWR_MODE, UIC_LINK_HIBERN8_STATE},
	[UFS_PM_LVL_5] = {UFS_POWERDOWN_PWR_MODE, UIC_LINK_OFF_STATE},
	/*
	 * For DeepSleep, the link is first put in hibern8 and then off.
	 * Leaving the link in hibern8 is not supported.
	 */
	[UFS_PM_LVL_6] = {UFS_DEEPSLEEP_PWR_MODE, UIC_LINK_OFF_STATE},
};

static inline enum ufs_dev_pwr_mode
ufs_get_pm_lvl_to_dev_pwr_mode(enum ufs_pm_level lvl)
{
	return ufs_pm_lvl_states[lvl].dev_state;
}

static inline enum uic_link_state
ufs_get_pm_lvl_to_link_pwr_state(enum ufs_pm_level lvl)
{
	return ufs_pm_lvl_states[lvl].link_state;
}

static inline enum ufs_pm_level
ufs_get_desired_pm_lvl_for_dev_link_state(enum ufs_dev_pwr_mode dev_state,
					enum uic_link_state link_state)
{
	enum ufs_pm_level lvl;

	for (lvl = UFS_PM_LVL_0; lvl < UFS_PM_LVL_MAX; lvl++) {
		if ((ufs_pm_lvl_states[lvl].dev_state == dev_state) &&
			(ufs_pm_lvl_states[lvl].link_state == link_state))
			return lvl;
	}

	/* if no match found, return the level 0 */
	return UFS_PM_LVL_0;
}

static struct ufs_dev_fix ufs_fixups[] = {
	/* UFS cards deviations table */
	UFS_FIX(UFS_VENDOR_MICRON, UFS_ANY_MODEL,
		UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM |
		UFS_DEVICE_QUIRK_SWAP_L2P_ENTRY_FOR_HPB_READ),
	UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL,
		UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM |
		UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE |
		UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS),
	UFS_FIX(UFS_VENDOR_SKHYNIX, UFS_ANY_MODEL,
		UFS_DEVICE_QUIRK_HOST_PA_SAVECONFIGTIME),
	UFS_FIX(UFS_VENDOR_SKHYNIX, "hB8aL1" /*H28U62301AMR*/,
		UFS_DEVICE_QUIRK_HOST_VS_DEBUGSAVECONFIGTIME),
	UFS_FIX(UFS_VENDOR_TOSHIBA, UFS_ANY_MODEL,
		UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM),
	UFS_FIX(UFS_VENDOR_TOSHIBA, "THGLF2G9C8KBADG",
		UFS_DEVICE_QUIRK_PA_TACTIVATE),
	UFS_FIX(UFS_VENDOR_TOSHIBA, "THGLF2G9D8KBADG",
		UFS_DEVICE_QUIRK_PA_TACTIVATE),
	END_FIX
};

static irqreturn_t ufshcd_tmc_handler(struct ufs_hba *hba);
static void ufshcd_async_scan(void *data, async_cookie_t cookie);
static int ufshcd_reset_and_restore(struct ufs_hba *hba);
static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd);
static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag);
static void ufshcd_hba_exit(struct ufs_hba *hba);
static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params);
static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on);
static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba);
static int ufshcd_host_reset_and_restore(struct ufs_hba *hba);
static void ufshcd_resume_clkscaling(struct ufs_hba *hba);
static void ufshcd_suspend_clkscaling(struct ufs_hba *hba);
static void __ufshcd_suspend_clkscaling(struct ufs_hba *hba);
static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up);
static irqreturn_t ufshcd_intr(int irq, void *__hba);
static int ufshcd_change_power_mode(struct ufs_hba *hba,
			     struct ufs_pa_layer_attr *pwr_mode);
static int ufshcd_setup_hba_vreg(struct ufs_hba *hba, bool on);
static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on);
static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
					 struct ufs_vreg *vreg);
static int ufshcd_try_to_abort_task(struct ufs_hba *hba, int tag);
static void ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set);
static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable);
static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba);
static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba);

static inline void ufshcd_enable_irq(struct ufs_hba *hba)
{
	if (!hba->is_irq_enabled) {
		enable_irq(hba->irq);
		hba->is_irq_enabled = true;
	}
}

static inline void ufshcd_disable_irq(struct ufs_hba *hba)
{
	if (hba->is_irq_enabled) {
		disable_irq(hba->irq);
		hba->is_irq_enabled = false;
	}
}

static inline void ufshcd_wb_config(struct ufs_hba *hba)
{
	if (!ufshcd_is_wb_allowed(hba))
		return;

	ufshcd_wb_toggle(hba, true);

	ufshcd_wb_toggle_flush_during_h8(hba, true);
	if (!(hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL))
		ufshcd_wb_toggle_flush(hba, true);
}

static void ufshcd_scsi_unblock_requests(struct ufs_hba *hba)
{
	if (atomic_dec_and_test(&hba->scsi_block_reqs_cnt))
		scsi_unblock_requests(hba->host);
}

static void ufshcd_scsi_block_requests(struct ufs_hba *hba)
{
	if (atomic_inc_return(&hba->scsi_block_reqs_cnt) == 1)
		scsi_block_requests(hba->host);
}

static void ufshcd_add_cmd_upiu_trace(struct ufs_hba *hba, unsigned int tag,
				      enum ufs_trace_str_t str_t)
{
	struct utp_upiu_req *rq = hba->lrb[tag].ucd_req_ptr;
	struct utp_upiu_header *header;

	if (!trace_ufshcd_upiu_enabled())
		return;

	if (str_t == UFS_CMD_SEND)
		header = &rq->header;
	else
		header = &hba->lrb[tag].ucd_rsp_ptr->header;

	trace_ufshcd_upiu(dev_name(hba->dev), str_t, header, &rq->sc.cdb,
			  UFS_TSF_CDB);
}

static void ufshcd_add_query_upiu_trace(struct ufs_hba *hba,
					enum ufs_trace_str_t str_t,
					struct utp_upiu_req *rq_rsp)
{
	if (!trace_ufshcd_upiu_enabled())
		return;

	trace_ufshcd_upiu(dev_name(hba->dev), str_t, &rq_rsp->header,
			  &rq_rsp->qr, UFS_TSF_OSF);
}

static void ufshcd_add_tm_upiu_trace(struct ufs_hba *hba, unsigned int tag,
				     enum ufs_trace_str_t str_t)
{
	struct utp_task_req_desc *descp = &hba->utmrdl_base_addr[tag];

	if (!trace_ufshcd_upiu_enabled())
		return;

	if (str_t == UFS_TM_SEND)
		trace_ufshcd_upiu(dev_name(hba->dev), str_t,
				  &descp->upiu_req.req_header,
				  &descp->upiu_req.input_param1,
				  UFS_TSF_TM_INPUT);
	else
		trace_ufshcd_upiu(dev_name(hba->dev), str_t,
				  &descp->upiu_rsp.rsp_header,
				  &descp->upiu_rsp.output_param1,
				  UFS_TSF_TM_OUTPUT);
}

static void ufshcd_add_uic_command_trace(struct ufs_hba *hba,
					 struct uic_command *ucmd,
					 enum ufs_trace_str_t str_t)
{
	u32 cmd;

	if (!trace_ufshcd_uic_command_enabled())
		return;

	if (str_t == UFS_CMD_SEND)
		cmd = ucmd->command;
	else
		cmd = ufshcd_readl(hba, REG_UIC_COMMAND);

	trace_ufshcd_uic_command(dev_name(hba->dev), str_t, cmd,
				 ufshcd_readl(hba, REG_UIC_COMMAND_ARG_1),
				 ufshcd_readl(hba, REG_UIC_COMMAND_ARG_2),
				 ufshcd_readl(hba, REG_UIC_COMMAND_ARG_3));
}

static void ufshcd_add_command_trace(struct ufs_hba *hba, unsigned int tag,
				     enum ufs_trace_str_t str_t)
{
	u64 lba;
	u8 opcode = 0, group_id = 0;
	u32 intr, doorbell;
	struct ufshcd_lrb *lrbp = &hba->lrb[tag];
	struct scsi_cmnd *cmd = lrbp->cmd;
	struct request *rq = scsi_cmd_to_rq(cmd);
	int transfer_len = -1;

	if (!cmd)
		return;

	/* trace UPIU also */
	ufshcd_add_cmd_upiu_trace(hba, tag, str_t);
	if (!trace_ufshcd_command_enabled())
		return;

	opcode = cmd->cmnd[0];
	lba = scsi_get_lba(cmd);

	if (opcode == READ_10 || opcode == WRITE_10) {
		/*
		 * Currently we only fully trace read(10) and write(10) commands
		 */
		transfer_len =
		       be32_to_cpu(lrbp->ucd_req_ptr->sc.exp_data_transfer_len);
		if (opcode == WRITE_10)
			group_id = lrbp->cmd->cmnd[6];
	} else if (opcode == UNMAP) {
		/*
		 * The number of Bytes to be unmapped beginning with the lba.
		 */
		transfer_len = blk_rq_bytes(rq);
	}

	intr = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
	doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
	trace_ufshcd_command(dev_name(hba->dev), str_t, tag,
			doorbell, transfer_len, intr, lba, opcode, group_id);
}

static void ufshcd_print_clk_freqs(struct ufs_hba *hba)
{
	struct ufs_clk_info *clki;
	struct list_head *head = &hba->clk_list_head;

	if (list_empty(head))
		return;

	list_for_each_entry(clki, head, list) {
		if (!IS_ERR_OR_NULL(clki->clk) && clki->min_freq &&
				clki->max_freq)
			dev_err(hba->dev, "clk: %s, rate: %u\n",
					clki->name, clki->curr_freq);
	}
}

static void ufshcd_print_evt(struct ufs_hba *hba, u32 id,
			     char *err_name)
{
	int i;
	bool found = false;
	struct ufs_event_hist *e;

	if (id >= UFS_EVT_CNT)
		return;

	e = &hba->ufs_stats.event[id];

	for (i = 0; i < UFS_EVENT_HIST_LENGTH; i++) {
		int p = (i + e->pos) % UFS_EVENT_HIST_LENGTH;

		if (e->tstamp[p] == 0)
			continue;
		dev_err(hba->dev, "%s[%d] = 0x%x at %lld us\n", err_name, p,
			e->val[p], ktime_to_us(e->tstamp[p]));
		found = true;
	}

	if (!found)
		dev_err(hba->dev, "No record of %s\n", err_name);
	else
		dev_err(hba->dev, "%s: total cnt=%llu\n", err_name, e->cnt);
}

static void ufshcd_print_evt_hist(struct ufs_hba *hba)
{
	ufshcd_dump_regs(hba, 0, UFSHCI_REG_SPACE_SIZE, "host_regs: ");

	ufshcd_print_evt(hba, UFS_EVT_PA_ERR, "pa_err");
	ufshcd_print_evt(hba, UFS_EVT_DL_ERR, "dl_err");
	ufshcd_print_evt(hba, UFS_EVT_NL_ERR, "nl_err");
	ufshcd_print_evt(hba, UFS_EVT_TL_ERR, "tl_err");
	ufshcd_print_evt(hba, UFS_EVT_DME_ERR, "dme_err");
	ufshcd_print_evt(hba, UFS_EVT_AUTO_HIBERN8_ERR,
			 "auto_hibern8_err");
	ufshcd_print_evt(hba, UFS_EVT_FATAL_ERR, "fatal_err");
	ufshcd_print_evt(hba, UFS_EVT_LINK_STARTUP_FAIL,
			 "link_startup_fail");
	ufshcd_print_evt(hba, UFS_EVT_RESUME_ERR, "resume_fail");
	ufshcd_print_evt(hba, UFS_EVT_SUSPEND_ERR,
			 "suspend_fail");
	ufshcd_print_evt(hba, UFS_EVT_DEV_RESET, "dev_reset");
	ufshcd_print_evt(hba, UFS_EVT_HOST_RESET, "host_reset");
	ufshcd_print_evt(hba, UFS_EVT_ABORT, "task_abort");

	ufshcd_vops_dbg_register_dump(hba);
}

static
void ufshcd_print_trs(struct ufs_hba *hba, unsigned long bitmap, bool pr_prdt)
{
	struct ufshcd_lrb *lrbp;
	int prdt_length;
	int tag;

	for_each_set_bit(tag, &bitmap, hba->nutrs) {
		lrbp = &hba->lrb[tag];

		dev_err(hba->dev, "UPIU[%d] - issue time %lld us\n",
				tag, ktime_to_us(lrbp->issue_time_stamp));
		dev_err(hba->dev, "UPIU[%d] - complete time %lld us\n",
				tag, ktime_to_us(lrbp->compl_time_stamp));
		dev_err(hba->dev,
			"UPIU[%d] - Transfer Request Descriptor phys@0x%llx\n",
			tag, (u64)lrbp->utrd_dma_addr);

		ufshcd_hex_dump("UPIU TRD: ", lrbp->utr_descriptor_ptr,
				sizeof(struct utp_transfer_req_desc));
		dev_err(hba->dev, "UPIU[%d] - Request UPIU phys@0x%llx\n", tag,
			(u64)lrbp->ucd_req_dma_addr);
		ufshcd_hex_dump("UPIU REQ: ", lrbp->ucd_req_ptr,
				sizeof(struct utp_upiu_req));
		dev_err(hba->dev, "UPIU[%d] - Response UPIU phys@0x%llx\n", tag,
			(u64)lrbp->ucd_rsp_dma_addr);
		ufshcd_hex_dump("UPIU RSP: ", lrbp->ucd_rsp_ptr,
				sizeof(struct utp_upiu_rsp));

		prdt_length = le16_to_cpu(
			lrbp->utr_descriptor_ptr->prd_table_length);
		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN)
			prdt_length /= sizeof(struct ufshcd_sg_entry);

		dev_err(hba->dev,
			"UPIU[%d] - PRDT - %d entries  phys@0x%llx\n",
			tag, prdt_length,
			(u64)lrbp->ucd_prdt_dma_addr);

		if (pr_prdt)
			ufshcd_hex_dump("UPIU PRDT: ", lrbp->ucd_prdt_ptr,
				sizeof(struct ufshcd_sg_entry) * prdt_length);
	}
}

static void ufshcd_print_tmrs(struct ufs_hba *hba, unsigned long bitmap)
{
	int tag;

	for_each_set_bit(tag, &bitmap, hba->nutmrs) {
		struct utp_task_req_desc *tmrdp = &hba->utmrdl_base_addr[tag];

		dev_err(hba->dev, "TM[%d] - Task Management Header\n", tag);
		ufshcd_hex_dump("", tmrdp, sizeof(*tmrdp));
	}
}

static void ufshcd_print_host_state(struct ufs_hba *hba)
{
	struct scsi_device *sdev_ufs = hba->sdev_ufs_device;

	dev_err(hba->dev, "UFS Host state=%d\n", hba->ufshcd_state);
	dev_err(hba->dev, "outstanding reqs=0x%lx tasks=0x%lx\n",
		hba->outstanding_reqs, hba->outstanding_tasks);
	dev_err(hba->dev, "saved_err=0x%x, saved_uic_err=0x%x\n",
		hba->saved_err, hba->saved_uic_err);
	dev_err(hba->dev, "Device power mode=%d, UIC link state=%d\n",
		hba->curr_dev_pwr_mode, hba->uic_link_state);
	dev_err(hba->dev, "PM in progress=%d, sys. suspended=%d\n",
		hba->pm_op_in_progress, hba->is_sys_suspended);
	dev_err(hba->dev, "Auto BKOPS=%d, Host self-block=%d\n",
		hba->auto_bkops_enabled, hba->host->host_self_blocked);
	dev_err(hba->dev, "Clk gate=%d\n", hba->clk_gating.state);
	dev_err(hba->dev,
		"last_hibern8_exit_tstamp at %lld us, hibern8_exit_cnt=%d\n",
		ktime_to_us(hba->ufs_stats.last_hibern8_exit_tstamp),
		hba->ufs_stats.hibern8_exit_cnt);
	dev_err(hba->dev, "last intr at %lld us, last intr status=0x%x\n",
		ktime_to_us(hba->ufs_stats.last_intr_ts),
		hba->ufs_stats.last_intr_status);
	dev_err(hba->dev, "error handling flags=0x%x, req. abort count=%d\n",
		hba->eh_flags, hba->req_abort_count);
	dev_err(hba->dev, "hba->ufs_version=0x%x, Host capabilities=0x%x, caps=0x%x\n",
		hba->ufs_version, hba->capabilities, hba->caps);
	dev_err(hba->dev, "quirks=0x%x, dev. quirks=0x%x\n", hba->quirks,
		hba->dev_quirks);
	if (sdev_ufs)
		dev_err(hba->dev, "UFS dev info: %.8s %.16s rev %.4s\n",
			sdev_ufs->vendor, sdev_ufs->model, sdev_ufs->rev);

	ufshcd_print_clk_freqs(hba);
}

/**
 * ufshcd_print_pwr_info - print power params as saved in hba
 * power info
 * @hba: per-adapter instance
 */
static void ufshcd_print_pwr_info(struct ufs_hba *hba)
{
	static const char * const names[] = {
		"INVALID MODE",
		"FAST MODE",
		"SLOW_MODE",
		"INVALID MODE",
		"FASTAUTO_MODE",
		"SLOWAUTO_MODE",
		"INVALID MODE",
	};

	dev_err(hba->dev, "%s:[RX, TX]: gear=[%d, %d], lane[%d, %d], pwr[%s, %s], rate = %d\n",
		 __func__,
		 hba->pwr_info.gear_rx, hba->pwr_info.gear_tx,
		 hba->pwr_info.lane_rx, hba->pwr_info.lane_tx,
		 names[hba->pwr_info.pwr_rx],
		 names[hba->pwr_info.pwr_tx],
		 hba->pwr_info.hs_rate);
}

static void ufshcd_device_reset(struct ufs_hba *hba)
{
	int err;

	err = ufshcd_vops_device_reset(hba);

	if (!err) {
		ufshcd_set_ufs_dev_active(hba);
		if (ufshcd_is_wb_allowed(hba)) {
			hba->dev_info.wb_enabled = false;
			hba->dev_info.wb_buf_flush_enabled = false;
		}
	}
	if (err != -EOPNOTSUPP)
		ufshcd_update_evt_hist(hba, UFS_EVT_DEV_RESET, err);
}

void ufshcd_delay_us(unsigned long us, unsigned long tolerance)
{
	if (!us)
		return;

	if (us < 10)
		udelay(us);
	else
		usleep_range(us, us + tolerance);
}
EXPORT_SYMBOL_GPL(ufshcd_delay_us);

/**
 * ufshcd_wait_for_register - wait for register value to change
 * @hba: per-adapter interface
 * @reg: mmio register offset
 * @mask: mask to apply to the read register value
 * @val: value to wait for
 * @interval_us: polling interval in microseconds
 * @timeout_ms: timeout in milliseconds
 *
 * Return:
 * -ETIMEDOUT on error, zero on success.
 */
int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
				u32 val, unsigned long interval_us,
				unsigned long timeout_ms)
{
	int err = 0;
	unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);

	/* ignore bits that we don't intend to wait on */
	val = val & mask;

	while ((ufshcd_readl(hba, reg) & mask) != val) {
		usleep_range(interval_us, interval_us + 50);
		if (time_after(jiffies, timeout)) {
			if ((ufshcd_readl(hba, reg) & mask) != val)
				err = -ETIMEDOUT;
			break;
		}
	}

	return err;
}

/**
 * ufshcd_get_intr_mask - Get the interrupt bit mask
 * @hba: Pointer to adapter instance
 *
 * Returns interrupt bit mask per version
 */
static inline u32 ufshcd_get_intr_mask(struct ufs_hba *hba)
{
	if (hba->ufs_version == ufshci_version(1, 0))
		return INTERRUPT_MASK_ALL_VER_10;
	if (hba->ufs_version <= ufshci_version(2, 0))
		return INTERRUPT_MASK_ALL_VER_11;

	return INTERRUPT_MASK_ALL_VER_21;
}

/**
 * ufshcd_get_ufs_version - Get the UFS version supported by the HBA
 * @hba: Pointer to adapter instance
 *
 * Returns UFSHCI version supported by the controller
 */
static inline u32 ufshcd_get_ufs_version(struct ufs_hba *hba)
{
	u32 ufshci_ver;

	if (hba->quirks & UFSHCD_QUIRK_BROKEN_UFS_HCI_VERSION)
		ufshci_ver = ufshcd_vops_get_ufs_hci_version(hba);
	else
		ufshci_ver = ufshcd_readl(hba, REG_UFS_VERSION);

	/*
	 * UFSHCI v1.x uses a different version scheme, in order
	 * to allow the use of comparisons with the ufshci_version
	 * function, we convert it to the same scheme as ufs 2.0+.
	 */
	if (ufshci_ver & 0x00010000)
		return ufshci_version(1, ufshci_ver & 0x00000100);

	return ufshci_ver;
}

/**
 * ufshcd_is_device_present - Check if any device connected to
 *			      the host controller
 * @hba: pointer to adapter instance
 *
 * Returns true if device present, false if no device detected
 */
static inline bool ufshcd_is_device_present(struct ufs_hba *hba)
{
	return (ufshcd_readl(hba, REG_CONTROLLER_STATUS) &
						DEVICE_PRESENT) ? true : false;
}

/**
 * ufshcd_get_tr_ocs - Get the UTRD Overall Command Status
 * @lrbp: pointer to local command reference block
 *
 * This function is used to get the OCS field from UTRD
 * Returns the OCS field in the UTRD
 */
static enum utp_ocs ufshcd_get_tr_ocs(struct ufshcd_lrb *lrbp)
{
	return le32_to_cpu(lrbp->utr_descriptor_ptr->header.dword_2) & MASK_OCS;
}

/**
 * ufshcd_utrl_clear - Clear a bit in UTRLCLR register
 * @hba: per adapter instance
 * @pos: position of the bit to be cleared
 */
static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 pos)
{
	if (hba->quirks & UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR)
		ufshcd_writel(hba, (1 << pos), REG_UTP_TRANSFER_REQ_LIST_CLEAR);
	else
		ufshcd_writel(hba, ~(1 << pos),
				REG_UTP_TRANSFER_REQ_LIST_CLEAR);
}

/**
 * ufshcd_utmrl_clear - Clear a bit in UTRMLCLR register
 * @hba: per adapter instance
 * @pos: position of the bit to be cleared
 */
static inline void ufshcd_utmrl_clear(struct ufs_hba *hba, u32 pos)
{
	if (hba->quirks & UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR)
		ufshcd_writel(hba, (1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
	else
		ufshcd_writel(hba, ~(1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
}

/**
 * ufshcd_get_lists_status - Check UCRDY, UTRLRDY and UTMRLRDY
 * @reg: Register value of host controller status
 *
 * Returns integer, 0 on Success and positive value if failed
 */
static inline int ufshcd_get_lists_status(u32 reg)
{
	return !((reg & UFSHCD_STATUS_READY) == UFSHCD_STATUS_READY);
}

/**
 * ufshcd_get_uic_cmd_result - Get the UIC command result
 * @hba: Pointer to adapter instance
 *
 * This function gets the result of UIC command completion
 * Returns 0 on success, non zero value on error
 */
static inline int ufshcd_get_uic_cmd_result(struct ufs_hba *hba)
{
	return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_2) &
	       MASK_UIC_COMMAND_RESULT;
}

/**
 * ufshcd_get_dme_attr_val - Get the value of attribute returned by UIC command
 * @hba: Pointer to adapter instance
 *
 * This function gets UIC command argument3
 * Returns 0 on success, non zero value on error
 */
static inline u32 ufshcd_get_dme_attr_val(struct ufs_hba *hba)
{
	return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_3);
}

/**
 * ufshcd_get_req_rsp - returns the TR response transaction type
 * @ucd_rsp_ptr: pointer to response UPIU
 */
static inline int
ufshcd_get_req_rsp(struct utp_upiu_rsp *ucd_rsp_ptr)
{
	return be32_to_cpu(ucd_rsp_ptr->header.dword_0) >> 24;
}

/**
 * ufshcd_get_rsp_upiu_result - Get the result from response UPIU
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * This function gets the response status and scsi_status from response UPIU
 * Returns the response result code.
 */
static inline int
ufshcd_get_rsp_upiu_result(struct utp_upiu_rsp *ucd_rsp_ptr)
{
	return be32_to_cpu(ucd_rsp_ptr->header.dword_1) & MASK_RSP_UPIU_RESULT;
}

/*
 * ufshcd_get_rsp_upiu_data_seg_len - Get the data segment length
 *				from response UPIU
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * Return the data segment length.
 */
static inline unsigned int
ufshcd_get_rsp_upiu_data_seg_len(struct utp_upiu_rsp *ucd_rsp_ptr)
{
	return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
		MASK_RSP_UPIU_DATA_SEG_LEN;
}

/**
 * ufshcd_is_exception_event - Check if the device raised an exception event
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * The function checks if the device raised an exception event indicated in
 * the Device Information field of response UPIU.
 *
 * Returns true if exception is raised, false otherwise.
 */
static inline bool ufshcd_is_exception_event(struct utp_upiu_rsp *ucd_rsp_ptr)
{
	return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
			MASK_RSP_EXCEPTION_EVENT ? true : false;
}

/**
 * ufshcd_reset_intr_aggr - Reset interrupt aggregation values.
 * @hba: per adapter instance
 */
static inline void
ufshcd_reset_intr_aggr(struct ufs_hba *hba)
{
	ufshcd_writel(hba, INT_AGGR_ENABLE |
		      INT_AGGR_COUNTER_AND_TIMER_RESET,
		      REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
}

/**
 * ufshcd_config_intr_aggr - Configure interrupt aggregation values.
 * @hba: per adapter instance
 * @cnt: Interrupt aggregation counter threshold
 * @tmout: Interrupt aggregation timeout value
 */
static inline void
ufshcd_config_intr_aggr(struct ufs_hba *hba, u8 cnt, u8 tmout)
{
	ufshcd_writel(hba, INT_AGGR_ENABLE | INT_AGGR_PARAM_WRITE |
		      INT_AGGR_COUNTER_THLD_VAL(cnt) |
		      INT_AGGR_TIMEOUT_VAL(tmout),
		      REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
}

/**
 * ufshcd_disable_intr_aggr - Disables interrupt aggregation.
 * @hba: per adapter instance
 */
static inline void ufshcd_disable_intr_aggr(struct ufs_hba *hba)
{
	ufshcd_writel(hba, 0, REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
}

/**
 * ufshcd_enable_run_stop_reg - Enable run-stop registers,
 *			When run-stop registers are set to 1, it indicates the
 *			host controller that it can process the requests
 * @hba: per adapter instance
 */
static void ufshcd_enable_run_stop_reg(struct ufs_hba *hba)
{
	ufshcd_writel(hba, UTP_TASK_REQ_LIST_RUN_STOP_BIT,
		      REG_UTP_TASK_REQ_LIST_RUN_STOP);
	ufshcd_writel(hba, UTP_TRANSFER_REQ_LIST_RUN_STOP_BIT,
		      REG_UTP_TRANSFER_REQ_LIST_RUN_STOP);
}

/**
 * ufshcd_hba_start - Start controller initialization sequence
 * @hba: per adapter instance
 */
static inline void ufshcd_hba_start(struct ufs_hba *hba)
{
	u32 val = CONTROLLER_ENABLE;

	if (ufshcd_crypto_enable(hba))
		val |= CRYPTO_GENERAL_ENABLE;

	ufshcd_writel(hba, val, REG_CONTROLLER_ENABLE);
}

/**
 * ufshcd_is_hba_active - Get controller state
 * @hba: per adapter instance
 *
 * Returns false if controller is active, true otherwise
 */
static inline bool ufshcd_is_hba_active(struct ufs_hba *hba)
{
	return (ufshcd_readl(hba, REG_CONTROLLER_ENABLE) & CONTROLLER_ENABLE)
		? false : true;
}

u32 ufshcd_get_local_unipro_ver(struct ufs_hba *hba)
{
	/* HCI version 1.0 and 1.1 supports UniPro 1.41 */
	if (hba->ufs_version <= ufshci_version(1, 1))
		return UFS_UNIPRO_VER_1_41;
	else
		return UFS_UNIPRO_VER_1_6;
}
EXPORT_SYMBOL(ufshcd_get_local_unipro_ver);

static bool ufshcd_is_unipro_pa_params_tuning_req(struct ufs_hba *hba)
{
	/*
	 * If both host and device support UniPro ver1.6 or later, PA layer
	 * parameters tuning happens during link startup itself.
	 *
	 * We can manually tune PA layer parameters if either host or device
	 * doesn't support UniPro ver 1.6 or later. But to keep manual tuning
	 * logic simple, we will only do manual tuning if local unipro version
	 * doesn't support ver1.6 or later.
	 */
	if (ufshcd_get_local_unipro_ver(hba) < UFS_UNIPRO_VER_1_6)
		return true;
	else
		return false;
}

/**
 * ufshcd_set_clk_freq - set UFS controller clock frequencies
 * @hba: per adapter instance
 * @scale_up: If True, set max possible frequency othewise set low frequency
 *
 * Returns 0 if successful
 * Returns < 0 for any other errors
 */
static int ufshcd_set_clk_freq(struct ufs_hba *hba, bool scale_up)
{
	int ret = 0;
	struct ufs_clk_info *clki;
	struct list_head *head = &hba->clk_list_head;

	if (list_empty(head))
		goto out;

	list_for_each_entry(clki, head, list) {
		if (!IS_ERR_OR_NULL(clki->clk)) {
			if (scale_up && clki->max_freq) {
				if (clki->curr_freq == clki->max_freq)
					continue;

				ret = clk_set_rate(clki->clk, clki->max_freq);
				if (ret) {
					dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
						__func__, clki->name,
						clki->max_freq, ret);
					break;
				}
				trace_ufshcd_clk_scaling(dev_name(hba->dev),
						"scaled up", clki->name,
						clki->curr_freq,
						clki->max_freq);

				clki->curr_freq = clki->max_freq;

			} else if (!scale_up && clki->min_freq) {
				if (clki->curr_freq == clki->min_freq)
					continue;

				ret = clk_set_rate(clki->clk, clki->min_freq);
				if (ret) {
					dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
						__func__, clki->name,
						clki->min_freq, ret);
					break;
				}
				trace_ufshcd_clk_scaling(dev_name(hba->dev),
						"scaled down", clki->name,
						clki->curr_freq,
						clki->min_freq);
				clki->curr_freq = clki->min_freq;
			}
		}
		dev_dbg(hba->dev, "%s: clk: %s, rate: %lu\n", __func__,
				clki->name, clk_get_rate(clki->clk));
	}

out:
	return ret;
}

/**
 * ufshcd_scale_clks - scale up or scale down UFS controller clocks
 * @hba: per adapter instance
 * @scale_up: True if scaling up and false if scaling down
 *
 * Returns 0 if successful
 * Returns < 0 for any other errors
 */
static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
{
	int ret = 0;
	ktime_t start = ktime_get();

	ret = ufshcd_vops_clk_scale_notify(hba, scale_up, PRE_CHANGE);
	if (ret)
		goto out;

	ret = ufshcd_set_clk_freq(hba, scale_up);
	if (ret)
		goto out;

	ret = ufshcd_vops_clk_scale_notify(hba, scale_up, POST_CHANGE);
	if (ret)
		ufshcd_set_clk_freq(hba, !scale_up);

out:
	trace_ufshcd_profile_clk_scaling(dev_name(hba->dev),
			(scale_up ? "up" : "down"),
			ktime_to_us(ktime_sub(ktime_get(), start)), ret);
	return ret;
}

/**
 * ufshcd_is_devfreq_scaling_required - check if scaling is required or not
 * @hba: per adapter instance
 * @scale_up: True if scaling up and false if scaling down
 *
 * Returns true if scaling is required, false otherwise.
 */
static bool ufshcd_is_devfreq_scaling_required(struct ufs_hba *hba,
					       bool scale_up)
{
	struct ufs_clk_info *clki;
	struct list_head *head = &hba->clk_list_head;

	if (list_empty(head))
		return false;

	list_for_each_entry(clki, head, list) {
		if (!IS_ERR_OR_NULL(clki->clk)) {
			if (scale_up && clki->max_freq) {
				if (clki->curr_freq == clki->max_freq)
					continue;
				return true;
			} else if (!scale_up && clki->min_freq) {
				if (clki->curr_freq == clki->min_freq)
					continue;
				return true;
			}
		}
	}

	return false;
}

static int ufshcd_wait_for_doorbell_clr(struct ufs_hba *hba,
					u64 wait_timeout_us)
{
	unsigned long flags;
	int ret = 0;
	u32 tm_doorbell;
	u32 tr_doorbell;
	bool timeout = false, do_last_check = false;
	ktime_t start;

	ufshcd_hold(hba, false);
	spin_lock_irqsave(hba->host->host_lock, flags);
	/*
	 * Wait for all the outstanding tasks/transfer requests.
	 * Verify by checking the doorbell registers are clear.
	 */
	start = ktime_get();
	do {
		if (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL) {
			ret = -EBUSY;
			goto out;
		}

		tm_doorbell = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL);
		tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
		if (!tm_doorbell && !tr_doorbell) {
			timeout = false;
			break;
		} else if (do_last_check) {
			break;
		}

		spin_unlock_irqrestore(hba->host->host_lock, flags);
		schedule();
		if (ktime_to_us(ktime_sub(ktime_get(), start)) >
		    wait_timeout_us) {
			timeout = true;
			/*
			 * We might have scheduled out for long time so make
			 * sure to check if doorbells are cleared by this time
			 * or not.
			 */
			do_last_check = true;
		}
		spin_lock_irqsave(hba->host->host_lock, flags);
	} while (tm_doorbell || tr_doorbell);

	if (timeout) {
		dev_err(hba->dev,
			"%s: timedout waiting for doorbell to clear (tm=0x%x, tr=0x%x)\n",
			__func__, tm_doorbell, tr_doorbell);
		ret = -EBUSY;
	}
out:
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	ufshcd_release(hba);
	return ret;
}

/**
 * ufshcd_scale_gear - scale up/down UFS gear
 * @hba: per adapter instance
 * @scale_up: True for scaling up gear and false for scaling down
 *
 * Returns 0 for success,
 * Returns -EBUSY if scaling can't happen at this time
 * Returns non-zero for any other errors
 */
static int ufshcd_scale_gear(struct ufs_hba *hba, bool scale_up)
{
	int ret = 0;
	struct ufs_pa_layer_attr new_pwr_info;

	if (scale_up) {
		memcpy(&new_pwr_info, &hba->clk_scaling.saved_pwr_info.info,
		       sizeof(struct ufs_pa_layer_attr));
	} else {
		memcpy(&new_pwr_info, &hba->pwr_info,
		       sizeof(struct ufs_pa_layer_attr));

		if (hba->pwr_info.gear_tx > hba->clk_scaling.min_gear ||
		    hba->pwr_info.gear_rx > hba->clk_scaling.min_gear) {
			/* save the current power mode */
			memcpy(&hba->clk_scaling.saved_pwr_info.info,
				&hba->pwr_info,
				sizeof(struct ufs_pa_layer_attr));

			/* scale down gear */
			new_pwr_info.gear_tx = hba->clk_scaling.min_gear;
			new_pwr_info.gear_rx = hba->clk_scaling.min_gear;
		}
	}

	/* check if the power mode needs to be changed or not? */
	ret = ufshcd_config_pwr_mode(hba, &new_pwr_info);
	if (ret)
		dev_err(hba->dev, "%s: failed err %d, old gear: (tx %d rx %d), new gear: (tx %d rx %d)",
			__func__, ret,
			hba->pwr_info.gear_tx, hba->pwr_info.gear_rx,
			new_pwr_info.gear_tx, new_pwr_info.gear_rx);

	return ret;
}

static int ufshcd_clock_scaling_prepare(struct ufs_hba *hba)
{
	#define DOORBELL_CLR_TOUT_US		(1000 * 1000) /* 1 sec */
	int ret = 0;
	/*
	 * make sure that there are no outstanding requests when
	 * clock scaling is in progress
	 */
	ufshcd_scsi_block_requests(hba);
	down_write(&hba->clk_scaling_lock);

	if (!hba->clk_scaling.is_allowed ||
	    ufshcd_wait_for_doorbell_clr(hba, DOORBELL_CLR_TOUT_US)) {
		ret = -EBUSY;
		up_write(&hba->clk_scaling_lock);
		ufshcd_scsi_unblock_requests(hba);
		goto out;
	}

	/* let's not get into low power until clock scaling is completed */
	ufshcd_hold(hba, false);

out:
	return ret;
}

static void ufshcd_clock_scaling_unprepare(struct ufs_hba *hba, bool writelock)
{
	if (writelock)
		up_write(&hba->clk_scaling_lock);
	else
		up_read(&hba->clk_scaling_lock);
	ufshcd_scsi_unblock_requests(hba);
	ufshcd_release(hba);
}

/**
 * ufshcd_devfreq_scale - scale up/down UFS clocks and gear
 * @hba: per adapter instance
 * @scale_up: True for scaling up and false for scalin down
 *
 * Returns 0 for success,
 * Returns -EBUSY if scaling can't happen at this time
 * Returns non-zero for any other errors
 */
static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up)
{
	int ret = 0;
	bool is_writelock = true;

	ret = ufshcd_clock_scaling_prepare(hba);
	if (ret)
		return ret;

	/* scale down the gear before scaling down clocks */
	if (!scale_up) {
		ret = ufshcd_scale_gear(hba, false);
		if (ret)
			goto out_unprepare;
	}

	ret = ufshcd_scale_clks(hba, scale_up);
	if (ret) {
		if (!scale_up)
			ufshcd_scale_gear(hba, true);
		goto out_unprepare;
	}

	/* scale up the gear after scaling up clocks */
	if (scale_up) {
		ret = ufshcd_scale_gear(hba, true);
		if (ret) {
			ufshcd_scale_clks(hba, false);
			goto out_unprepare;
		}
	}

	/* Enable Write Booster if we have scaled up else disable it */
	downgrade_write(&hba->clk_scaling_lock);
	is_writelock = false;
	ufshcd_wb_toggle(hba, scale_up);

out_unprepare:
	ufshcd_clock_scaling_unprepare(hba, is_writelock);
	return ret;
}

static void ufshcd_clk_scaling_suspend_work(struct work_struct *work)
{
	struct ufs_hba *hba = container_of(work, struct ufs_hba,
					   clk_scaling.suspend_work);
	unsigned long irq_flags;

	spin_lock_irqsave(hba->host->host_lock, irq_flags);
	if (hba->clk_scaling.active_reqs || hba->clk_scaling.is_suspended) {
		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
		return;
	}
	hba->clk_scaling.is_suspended = true;
	spin_unlock_irqrestore(hba->host->host_lock, irq_flags);

	__ufshcd_suspend_clkscaling(hba);
}

static void ufshcd_clk_scaling_resume_work(struct work_struct *work)
{
	struct ufs_hba *hba = container_of(work, struct ufs_hba,
					   clk_scaling.resume_work);
	unsigned long irq_flags;

	spin_lock_irqsave(hba->host->host_lock, irq_flags);
	if (!hba->clk_scaling.is_suspended) {
		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
		return;
	}
	hba->clk_scaling.is_suspended = false;
	spin_unlock_irqrestore(hba->host->host_lock, irq_flags);

	devfreq_resume_device(hba->devfreq);
}

static int ufshcd_devfreq_target(struct device *dev,
				unsigned long *freq, u32 flags)
{
	int ret = 0;
	struct ufs_hba *hba = dev_get_drvdata(dev);
	ktime_t start;
	bool scale_up, sched_clk_scaling_suspend_work = false;
	struct list_head *clk_list = &hba->clk_list_head;
	struct ufs_clk_info *clki;
	unsigned long irq_flags;

	if (!ufshcd_is_clkscaling_supported(hba))
		return -EINVAL;

	clki = list_first_entry(&hba->clk_list_head, struct ufs_clk_info, list);
	/* Override with the closest supported frequency */
	*freq = (unsigned long) clk_round_rate(clki->clk, *freq);
	spin_lock_irqsave(hba->host->host_lock, irq_flags);
	if (ufshcd_eh_in_progress(hba)) {
		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
		return 0;
	}

	if (!hba->clk_scaling.active_reqs)
		sched_clk_scaling_suspend_work = true;

	if (list_empty(clk_list)) {
		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
		goto out;
	}

	/* Decide based on the rounded-off frequency and update */
	scale_up = (*freq == clki->max_freq) ? true : false;
	if (!scale_up)
		*freq = clki->min_freq;
	/* Update the frequency */
	if (!ufshcd_is_devfreq_scaling_required(hba, scale_up)) {
		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
		ret = 0;
		goto out; /* no state change required */
	}
	spin_unlock_irqrestore(hba->host->host_lock, irq_flags);

	start = ktime_get();
	ret = ufshcd_devfreq_scale(hba, scale_up);

	trace_ufshcd_profile_clk_scaling(dev_name(hba->dev),
		(scale_up ? "up" : "down"),
		ktime_to_us(ktime_sub(ktime_get(), start)), ret);

out:
	if (sched_clk_scaling_suspend_work)
		queue_work(hba->clk_scaling.workq,
			   &hba->clk_scaling.suspend_work);

	return ret;
}

static bool ufshcd_is_busy(struct request *req, void *priv, bool reserved)
{
	int *busy = priv;

	WARN_ON_ONCE(reserved);
	(*busy)++;
	return false;
}

/* Whether or not any tag is in use by a request that is in progress. */
static bool ufshcd_any_tag_in_use(struct ufs_hba *hba)
{
	struct request_queue *q = hba->cmd_queue;
	int busy = 0;

	blk_mq_tagset_busy_iter(q->tag_set, ufshcd_is_busy, &busy);
	return busy;
}

static int ufshcd_devfreq_get_dev_status(struct device *dev,
		struct devfreq_dev_status *stat)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);
	struct ufs_clk_scaling *scaling = &hba->clk_scaling;
	unsigned long flags;
	struct list_head *clk_list = &hba->clk_list_head;
	struct ufs_clk_info *clki;
	ktime_t curr_t;

	if (!ufshcd_is_clkscaling_supported(hba))
		return -EINVAL;

	memset(stat, 0, sizeof(*stat));

	spin_lock_irqsave(hba->host->host_lock, flags);
	curr_t = ktime_get();
	if (!scaling->window_start_t)
		goto start_window;

	clki = list_first_entry(clk_list, struct ufs_clk_info, list);
	/*
	 * If current frequency is 0, then the ondemand governor considers
	 * there's no initial frequency set. And it always requests to set
	 * to max. frequency.
	 */
	stat->current_frequency = clki->curr_freq;
	if (scaling->is_busy_started)
		scaling->tot_busy_t += ktime_us_delta(curr_t,
				scaling->busy_start_t);

	stat->total_time = ktime_us_delta(curr_t, scaling->window_start_t);
	stat->busy_time = scaling->tot_busy_t;
start_window:
	scaling->window_start_t = curr_t;
	scaling->tot_busy_t = 0;

	if (hba->outstanding_reqs) {
		scaling->busy_start_t = curr_t;
		scaling->is_busy_started = true;
	} else {
		scaling->busy_start_t = 0;
		scaling->is_busy_started = false;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	return 0;
}

static int ufshcd_devfreq_init(struct ufs_hba *hba)
{
	struct list_head *clk_list = &hba->clk_list_head;
	struct ufs_clk_info *clki;
	struct devfreq *devfreq;
	int ret;

	/* Skip devfreq if we don't have any clocks in the list */
	if (list_empty(clk_list))
		return 0;

	clki = list_first_entry(clk_list, struct ufs_clk_info, list);
	dev_pm_opp_add(hba->dev, clki->min_freq, 0);
	dev_pm_opp_add(hba->dev, clki->max_freq, 0);

	ufshcd_vops_config_scaling_param(hba, &hba->vps->devfreq_profile,
					 &hba->vps->ondemand_data);
	devfreq = devfreq_add_device(hba->dev,
			&hba->vps->devfreq_profile,
			DEVFREQ_GOV_SIMPLE_ONDEMAND,
			&hba->vps->ondemand_data);
	if (IS_ERR(devfreq)) {
		ret = PTR_ERR(devfreq);
		dev_err(hba->dev, "Unable to register with devfreq %d\n", ret);

		dev_pm_opp_remove(hba->dev, clki->min_freq);
		dev_pm_opp_remove(hba->dev, clki->max_freq);
		return ret;
	}

	hba->devfreq = devfreq;

	return 0;
}

static void ufshcd_devfreq_remove(struct ufs_hba *hba)
{
	struct list_head *clk_list = &hba->clk_list_head;
	struct ufs_clk_info *clki;

	if (!hba->devfreq)
		return;

	devfreq_remove_device(hba->devfreq);
	hba->devfreq = NULL;

	clki = list_first_entry(clk_list, struct ufs_clk_info, list);
	dev_pm_opp_remove(hba->dev, clki->min_freq);
	dev_pm_opp_remove(hba->dev, clki->max_freq);
}

static void __ufshcd_suspend_clkscaling(struct ufs_hba *hba)
{
	unsigned long flags;

	devfreq_suspend_device(hba->devfreq);
	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->clk_scaling.window_start_t = 0;
	spin_unlock_irqrestore(hba->host->host_lock, flags);
}

static void ufshcd_suspend_clkscaling(struct ufs_hba *hba)
{
	unsigned long flags;
	bool suspend = false;

	cancel_work_sync(&hba->clk_scaling.suspend_work);
	cancel_work_sync(&hba->clk_scaling.resume_work);

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (!hba->clk_scaling.is_suspended) {
		suspend = true;
		hba->clk_scaling.is_suspended = true;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	if (suspend)
		__ufshcd_suspend_clkscaling(hba);
}

static void ufshcd_resume_clkscaling(struct ufs_hba *hba)
{
	unsigned long flags;
	bool resume = false;

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (hba->clk_scaling.is_suspended) {
		resume = true;
		hba->clk_scaling.is_suspended = false;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	if (resume)
		devfreq_resume_device(hba->devfreq);
}

static ssize_t ufshcd_clkscale_enable_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);

	return sysfs_emit(buf, "%d\n", hba->clk_scaling.is_enabled);
}

static ssize_t ufshcd_clkscale_enable_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);
	u32 value;
	int err = 0;

	if (kstrtou32(buf, 0, &value))
		return -EINVAL;

	down(&hba->host_sem);
	if (!ufshcd_is_user_access_allowed(hba)) {
		err = -EBUSY;
		goto out;
	}

	value = !!value;
	if (value == hba->clk_scaling.is_enabled)
		goto out;

	ufshcd_rpm_get_sync(hba);
	ufshcd_hold(hba, false);

	hba->clk_scaling.is_enabled = value;

	if (value) {
		ufshcd_resume_clkscaling(hba);
	} else {
		ufshcd_suspend_clkscaling(hba);
		err = ufshcd_devfreq_scale(hba, true);
		if (err)
			dev_err(hba->dev, "%s: failed to scale clocks up %d\n",
					__func__, err);
	}

	ufshcd_release(hba);
	ufshcd_rpm_put_sync(hba);
out:
	up(&hba->host_sem);
	return err ? err : count;
}

static void ufshcd_init_clk_scaling_sysfs(struct ufs_hba *hba)
{
	hba->clk_scaling.enable_attr.show = ufshcd_clkscale_enable_show;
	hba->clk_scaling.enable_attr.store = ufshcd_clkscale_enable_store;
	sysfs_attr_init(&hba->clk_scaling.enable_attr.attr);
	hba->clk_scaling.enable_attr.attr.name = "clkscale_enable";
	hba->clk_scaling.enable_attr.attr.mode = 0644;
	if (device_create_file(hba->dev, &hba->clk_scaling.enable_attr))
		dev_err(hba->dev, "Failed to create sysfs for clkscale_enable\n");
}

static void ufshcd_remove_clk_scaling_sysfs(struct ufs_hba *hba)
{
	if (hba->clk_scaling.enable_attr.attr.name)
		device_remove_file(hba->dev, &hba->clk_scaling.enable_attr);
}

static void ufshcd_init_clk_scaling(struct ufs_hba *hba)
{
	char wq_name[sizeof("ufs_clkscaling_00")];

	if (!ufshcd_is_clkscaling_supported(hba))
		return;

	if (!hba->clk_scaling.min_gear)
		hba->clk_scaling.min_gear = UFS_HS_G1;

	INIT_WORK(&hba->clk_scaling.suspend_work,
		  ufshcd_clk_scaling_suspend_work);
	INIT_WORK(&hba->clk_scaling.resume_work,
		  ufshcd_clk_scaling_resume_work);

	snprintf(wq_name, sizeof(wq_name), "ufs_clkscaling_%d",
		 hba->host->host_no);
	hba->clk_scaling.workq = create_singlethread_workqueue(wq_name);

	hba->clk_scaling.is_initialized = true;
}

static void ufshcd_exit_clk_scaling(struct ufs_hba *hba)
{
	if (!hba->clk_scaling.is_initialized)
		return;

	ufshcd_remove_clk_scaling_sysfs(hba);
	destroy_workqueue(hba->clk_scaling.workq);
	ufshcd_devfreq_remove(hba);
	hba->clk_scaling.is_initialized = false;
}

static void ufshcd_ungate_work(struct work_struct *work)
{
	int ret;
	unsigned long flags;
	struct ufs_hba *hba = container_of(work, struct ufs_hba,
			clk_gating.ungate_work);

	cancel_delayed_work_sync(&hba->clk_gating.gate_work);

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (hba->clk_gating.state == CLKS_ON) {
		spin_unlock_irqrestore(hba->host->host_lock, flags);
		goto unblock_reqs;
	}

	spin_unlock_irqrestore(hba->host->host_lock, flags);
	ufshcd_hba_vreg_set_hpm(hba);
	ufshcd_setup_clocks(hba, true);

	ufshcd_enable_irq(hba);

	/* Exit from hibern8 */
	if (ufshcd_can_hibern8_during_gating(hba)) {
		/* Prevent gating in this path */
		hba->clk_gating.is_suspended = true;
		if (ufshcd_is_link_hibern8(hba)) {
			ret = ufshcd_uic_hibern8_exit(hba);
			if (ret)
				dev_err(hba->dev, "%s: hibern8 exit failed %d\n",
					__func__, ret);
			else
				ufshcd_set_link_active(hba);
		}
		hba->clk_gating.is_suspended = false;
	}
unblock_reqs:
	ufshcd_scsi_unblock_requests(hba);
}

/**
 * ufshcd_hold - Enable clocks that were gated earlier due to ufshcd_release.
 * Also, exit from hibern8 mode and set the link as active.
 * @hba: per adapter instance
 * @async: This indicates whether caller should ungate clocks asynchronously.
 */
int ufshcd_hold(struct ufs_hba *hba, bool async)
{
	int rc = 0;
	bool flush_result;
	unsigned long flags;

	if (!ufshcd_is_clkgating_allowed(hba))
		goto out;
	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->clk_gating.active_reqs++;

start:
	switch (hba->clk_gating.state) {
	case CLKS_ON:
		/*
		 * Wait for the ungate work to complete if in progress.
		 * Though the clocks may be in ON state, the link could
		 * still be in hibner8 state if hibern8 is allowed
		 * during clock gating.
		 * Make sure we exit hibern8 state also in addition to
		 * clocks being ON.
		 */
		if (ufshcd_can_hibern8_during_gating(hba) &&
		    ufshcd_is_link_hibern8(hba)) {
			if (async) {
				rc = -EAGAIN;
				hba->clk_gating.active_reqs--;
				break;
			}
			spin_unlock_irqrestore(hba->host->host_lock, flags);
			flush_result = flush_work(&hba->clk_gating.ungate_work);
			if (hba->clk_gating.is_suspended && !flush_result)
				goto out;
			spin_lock_irqsave(hba->host->host_lock, flags);
			goto start;
		}
		break;
	case REQ_CLKS_OFF:
		if (cancel_delayed_work(&hba->clk_gating.gate_work)) {
			hba->clk_gating.state = CLKS_ON;
			trace_ufshcd_clk_gating(dev_name(hba->dev),
						hba->clk_gating.state);
			break;
		}
		/*
		 * If we are here, it means gating work is either done or
		 * currently running. Hence, fall through to cancel gating
		 * work and to enable clocks.
		 */
		fallthrough;
	case CLKS_OFF:
		hba->clk_gating.state = REQ_CLKS_ON;
		trace_ufshcd_clk_gating(dev_name(hba->dev),
					hba->clk_gating.state);
		if (queue_work(hba->clk_gating.clk_gating_workq,
			       &hba->clk_gating.ungate_work))
			ufshcd_scsi_block_requests(hba);
		/*
		 * fall through to check if we should wait for this
		 * work to be done or not.
		 */
		fallthrough;
	case REQ_CLKS_ON:
		if (async) {
			rc = -EAGAIN;
			hba->clk_gating.active_reqs--;
			break;
		}

		spin_unlock_irqrestore(hba->host->host_lock, flags);
		flush_work(&hba->clk_gating.ungate_work);
		/* Make sure state is CLKS_ON before returning */
		spin_lock_irqsave(hba->host->host_lock, flags);
		goto start;
	default:
		dev_err(hba->dev, "%s: clk gating is in invalid state %d\n",
				__func__, hba->clk_gating.state);
		break;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);
out:
	return rc;
}
EXPORT_SYMBOL_GPL(ufshcd_hold);

static void ufshcd_gate_work(struct work_struct *work)
{
	struct ufs_hba *hba = container_of(work, struct ufs_hba,
			clk_gating.gate_work.work);
	unsigned long flags;
	int ret;

	spin_lock_irqsave(hba->host->host_lock, flags);
	/*
	 * In case you are here to cancel this work the gating state
	 * would be marked as REQ_CLKS_ON. In this case save time by
	 * skipping the gating work and exit after changing the clock
	 * state to CLKS_ON.
	 */
	if (hba->clk_gating.is_suspended ||
		(hba->clk_gating.state != REQ_CLKS_OFF)) {
		hba->clk_gating.state = CLKS_ON;
		trace_ufshcd_clk_gating(dev_name(hba->dev),
					hba->clk_gating.state);
		goto rel_lock;
	}

	if (hba->clk_gating.active_reqs
		|| hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL
		|| ufshcd_any_tag_in_use(hba) || hba->outstanding_tasks
		|| hba->active_uic_cmd || hba->uic_async_done)
		goto rel_lock;

	spin_unlock_irqrestore(hba->host->host_lock, flags);

	/* put the link into hibern8 mode before turning off clocks */
	if (ufshcd_can_hibern8_during_gating(hba)) {
		ret = ufshcd_uic_hibern8_enter(hba);
		if (ret) {
			hba->clk_gating.state = CLKS_ON;
			dev_err(hba->dev, "%s: hibern8 enter failed %d\n",
					__func__, ret);
			trace_ufshcd_clk_gating(dev_name(hba->dev),
						hba->clk_gating.state);
			goto out;
		}
		ufshcd_set_link_hibern8(hba);
	}

	ufshcd_disable_irq(hba);

	ufshcd_setup_clocks(hba, false);

	/* Put the host controller in low power mode if possible */
	ufshcd_hba_vreg_set_lpm(hba);
	/*
	 * In case you are here to cancel this work the gating state
	 * would be marked as REQ_CLKS_ON. In this case keep the state
	 * as REQ_CLKS_ON which would anyway imply that clocks are off
	 * and a request to turn them on is pending. By doing this way,
	 * we keep the state machine in tact and this would ultimately
	 * prevent from doing cancel work multiple times when there are
	 * new requests arriving before the current cancel work is done.
	 */
	spin_lock_irqsave(hba->host->host_lock, flags);
	if (hba->clk_gating.state == REQ_CLKS_OFF) {
		hba->clk_gating.state = CLKS_OFF;
		trace_ufshcd_clk_gating(dev_name(hba->dev),
					hba->clk_gating.state);
	}
rel_lock:
	spin_unlock_irqrestore(hba->host->host_lock, flags);
out:
	return;
}

/* host lock must be held before calling this variant */
static void __ufshcd_release(struct ufs_hba *hba)
{
	if (!ufshcd_is_clkgating_allowed(hba))
		return;

	hba->clk_gating.active_reqs--;

	if (hba->clk_gating.active_reqs || hba->clk_gating.is_suspended ||
	    hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL ||
	    hba->outstanding_tasks ||
	    hba->active_uic_cmd || hba->uic_async_done ||
	    hba->clk_gating.state == CLKS_OFF)
		return;

	hba->clk_gating.state = REQ_CLKS_OFF;
	trace_ufshcd_clk_gating(dev_name(hba->dev), hba->clk_gating.state);
	queue_delayed_work(hba->clk_gating.clk_gating_workq,
			   &hba->clk_gating.gate_work,
			   msecs_to_jiffies(hba->clk_gating.delay_ms));
}

void ufshcd_release(struct ufs_hba *hba)
{
	unsigned long flags;

	spin_lock_irqsave(hba->host->host_lock, flags);
	__ufshcd_release(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);
}
EXPORT_SYMBOL_GPL(ufshcd_release);

static ssize_t ufshcd_clkgate_delay_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);

	return sysfs_emit(buf, "%lu\n", hba->clk_gating.delay_ms);
}

static ssize_t ufshcd_clkgate_delay_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);
	unsigned long flags, value;

	if (kstrtoul(buf, 0, &value))
		return -EINVAL;

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->clk_gating.delay_ms = value;
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	return count;
}

static ssize_t ufshcd_clkgate_enable_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);

	return sysfs_emit(buf, "%d\n", hba->clk_gating.is_enabled);
}

static ssize_t ufshcd_clkgate_enable_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);
	unsigned long flags;
	u32 value;

	if (kstrtou32(buf, 0, &value))
		return -EINVAL;

	value = !!value;

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (value == hba->clk_gating.is_enabled)
		goto out;

	if (value)
		__ufshcd_release(hba);
	else
		hba->clk_gating.active_reqs++;

	hba->clk_gating.is_enabled = value;
out:
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	return count;
}

static void ufshcd_init_clk_gating_sysfs(struct ufs_hba *hba)
{
	hba->clk_gating.delay_attr.show = ufshcd_clkgate_delay_show;
	hba->clk_gating.delay_attr.store = ufshcd_clkgate_delay_store;
	sysfs_attr_init(&hba->clk_gating.delay_attr.attr);
	hba->clk_gating.delay_attr.attr.name = "clkgate_delay_ms";
	hba->clk_gating.delay_attr.attr.mode = 0644;
	if (device_create_file(hba->dev, &hba->clk_gating.delay_attr))
		dev_err(hba->dev, "Failed to create sysfs for clkgate_delay\n");

	hba->clk_gating.enable_attr.show = ufshcd_clkgate_enable_show;
	hba->clk_gating.enable_attr.store = ufshcd_clkgate_enable_store;
	sysfs_attr_init(&hba->clk_gating.enable_attr.attr);
	hba->clk_gating.enable_attr.attr.name = "clkgate_enable";
	hba->clk_gating.enable_attr.attr.mode = 0644;
	if (device_create_file(hba->dev, &hba->clk_gating.enable_attr))
		dev_err(hba->dev, "Failed to create sysfs for clkgate_enable\n");
}

static void ufshcd_remove_clk_gating_sysfs(struct ufs_hba *hba)
{
	if (hba->clk_gating.delay_attr.attr.name)
		device_remove_file(hba->dev, &hba->clk_gating.delay_attr);
	if (hba->clk_gating.enable_attr.attr.name)
		device_remove_file(hba->dev, &hba->clk_gating.enable_attr);
}

static void ufshcd_init_clk_gating(struct ufs_hba *hba)
{
	char wq_name[sizeof("ufs_clk_gating_00")];

	if (!ufshcd_is_clkgating_allowed(hba))
		return;

	hba->clk_gating.state = CLKS_ON;

	hba->clk_gating.delay_ms = 150;
	INIT_DELAYED_WORK(&hba->clk_gating.gate_work, ufshcd_gate_work);
	INIT_WORK(&hba->clk_gating.ungate_work, ufshcd_ungate_work);

	snprintf(wq_name, ARRAY_SIZE(wq_name), "ufs_clk_gating_%d",
		 hba->host->host_no);
	hba->clk_gating.clk_gating_workq = alloc_ordered_workqueue(wq_name,
					WQ_MEM_RECLAIM | WQ_HIGHPRI);

	ufshcd_init_clk_gating_sysfs(hba);

	hba->clk_gating.is_enabled = true;
	hba->clk_gating.is_initialized = true;
}

static void ufshcd_exit_clk_gating(struct ufs_hba *hba)
{
	if (!hba->clk_gating.is_initialized)
		return;
	ufshcd_remove_clk_gating_sysfs(hba);
	cancel_work_sync(&hba->clk_gating.ungate_work);
	cancel_delayed_work_sync(&hba->clk_gating.gate_work);
	destroy_workqueue(hba->clk_gating.clk_gating_workq);
	hba->clk_gating.is_initialized = false;
}

/* Must be called with host lock acquired */
static void ufshcd_clk_scaling_start_busy(struct ufs_hba *hba)
{
	bool queue_resume_work = false;
	ktime_t curr_t = ktime_get();
	unsigned long flags;

	if (!ufshcd_is_clkscaling_supported(hba))
		return;

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (!hba->clk_scaling.active_reqs++)
		queue_resume_work = true;

	if (!hba->clk_scaling.is_enabled || hba->pm_op_in_progress) {
		spin_unlock_irqrestore(hba->host->host_lock, flags);
		return;
	}

	if (queue_resume_work)
		queue_work(hba->clk_scaling.workq,
			   &hba->clk_scaling.resume_work);

	if (!hba->clk_scaling.window_start_t) {
		hba->clk_scaling.window_start_t = curr_t;
		hba->clk_scaling.tot_busy_t = 0;
		hba->clk_scaling.is_busy_started = false;
	}

	if (!hba->clk_scaling.is_busy_started) {
		hba->clk_scaling.busy_start_t = curr_t;
		hba->clk_scaling.is_busy_started = true;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);
}

static void ufshcd_clk_scaling_update_busy(struct ufs_hba *hba)
{
	struct ufs_clk_scaling *scaling = &hba->clk_scaling;
	unsigned long flags;

	if (!ufshcd_is_clkscaling_supported(hba))
		return;

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->clk_scaling.active_reqs--;
	if (!hba->outstanding_reqs && scaling->is_busy_started) {
		scaling->tot_busy_t += ktime_to_us(ktime_sub(ktime_get(),
					scaling->busy_start_t));
		scaling->busy_start_t = 0;
		scaling->is_busy_started = false;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);
}

static inline int ufshcd_monitor_opcode2dir(u8 opcode)
{
	if (opcode == READ_6 || opcode == READ_10 || opcode == READ_16)
		return READ;
	else if (opcode == WRITE_6 || opcode == WRITE_10 || opcode == WRITE_16)
		return WRITE;
	else
		return -EINVAL;
}

static inline bool ufshcd_should_inform_monitor(struct ufs_hba *hba,
						struct ufshcd_lrb *lrbp)
{
	struct ufs_hba_monitor *m = &hba->monitor;

	return (m->enabled && lrbp && lrbp->cmd &&
		(!m->chunk_size || m->chunk_size == lrbp->cmd->sdb.length) &&
		ktime_before(hba->monitor.enabled_ts, lrbp->issue_time_stamp));
}

static void ufshcd_start_monitor(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	int dir = ufshcd_monitor_opcode2dir(*lrbp->cmd->cmnd);
	unsigned long flags;

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (dir >= 0 && hba->monitor.nr_queued[dir]++ == 0)
		hba->monitor.busy_start_ts[dir] = ktime_get();
	spin_unlock_irqrestore(hba->host->host_lock, flags);
}

static void ufshcd_update_monitor(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	int dir = ufshcd_monitor_opcode2dir(*lrbp->cmd->cmnd);
	unsigned long flags;

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (dir >= 0 && hba->monitor.nr_queued[dir] > 0) {
		struct request *req = scsi_cmd_to_rq(lrbp->cmd);
		struct ufs_hba_monitor *m = &hba->monitor;
		ktime_t now, inc, lat;

		now = lrbp->compl_time_stamp;
		inc = ktime_sub(now, m->busy_start_ts[dir]);
		m->total_busy[dir] = ktime_add(m->total_busy[dir], inc);
		m->nr_sec_rw[dir] += blk_rq_sectors(req);

		/* Update latencies */
		m->nr_req[dir]++;
		lat = ktime_sub(now, lrbp->issue_time_stamp);
		m->lat_sum[dir] += lat;
		if (m->lat_max[dir] < lat || !m->lat_max[dir])
			m->lat_max[dir] = lat;
		if (m->lat_min[dir] > lat || !m->lat_min[dir])
			m->lat_min[dir] = lat;

		m->nr_queued[dir]--;
		/* Push forward the busy start of monitor */
		m->busy_start_ts[dir] = now;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);
}

/**
 * ufshcd_send_command - Send SCSI or device management commands
 * @hba: per adapter instance
 * @task_tag: Task tag of the command
 */
static inline
void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
{
	struct ufshcd_lrb *lrbp = &hba->lrb[task_tag];
	unsigned long flags;

	lrbp->issue_time_stamp = ktime_get();
	lrbp->compl_time_stamp = ktime_set(0, 0);
	ufshcd_add_command_trace(hba, task_tag, UFS_CMD_SEND);
	ufshcd_clk_scaling_start_busy(hba);
	if (unlikely(ufshcd_should_inform_monitor(hba, lrbp)))
		ufshcd_start_monitor(hba, lrbp);

	spin_lock_irqsave(&hba->outstanding_lock, flags);
	if (hba->vops && hba->vops->setup_xfer_req)
		hba->vops->setup_xfer_req(hba, task_tag, !!lrbp->cmd);
	__set_bit(task_tag, &hba->outstanding_reqs);
	ufshcd_writel(hba, 1 << task_tag, REG_UTP_TRANSFER_REQ_DOOR_BELL);
	spin_unlock_irqrestore(&hba->outstanding_lock, flags);

	/* Make sure that doorbell is committed immediately */
	wmb();
}

/**
 * ufshcd_copy_sense_data - Copy sense data in case of check condition
 * @lrbp: pointer to local reference block
 */
static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp)
{
	int len;
	if (lrbp->sense_buffer &&
	    ufshcd_get_rsp_upiu_data_seg_len(lrbp->ucd_rsp_ptr)) {
		int len_to_copy;

		len = be16_to_cpu(lrbp->ucd_rsp_ptr->sr.sense_data_len);
		len_to_copy = min_t(int, UFS_SENSE_SIZE, len);

		memcpy(lrbp->sense_buffer, lrbp->ucd_rsp_ptr->sr.sense_data,
		       len_to_copy);
	}
}

/**
 * ufshcd_copy_query_response() - Copy the Query Response and the data
 * descriptor
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 */
static
int ufshcd_copy_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	struct ufs_query_res *query_res = &hba->dev_cmd.query.response;

	memcpy(&query_res->upiu_res, &lrbp->ucd_rsp_ptr->qr, QUERY_OSF_SIZE);

	/* Get the descriptor */
	if (hba->dev_cmd.query.descriptor &&
	    lrbp->ucd_rsp_ptr->qr.opcode == UPIU_QUERY_OPCODE_READ_DESC) {
		u8 *descp = (u8 *)lrbp->ucd_rsp_ptr +
				GENERAL_UPIU_REQUEST_SIZE;
		u16 resp_len;
		u16 buf_len;

		/* data segment length */
		resp_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2) &
						MASK_QUERY_DATA_SEG_LEN;
		buf_len = be16_to_cpu(
				hba->dev_cmd.query.request.upiu_req.length);
		if (likely(buf_len >= resp_len)) {
			memcpy(hba->dev_cmd.query.descriptor, descp, resp_len);
		} else {
			dev_warn(hba->dev,
				 "%s: rsp size %d is bigger than buffer size %d",
				 __func__, resp_len, buf_len);
			return -EINVAL;
		}
	}

	return 0;
}

/**
 * ufshcd_hba_capabilities - Read controller capabilities
 * @hba: per adapter instance
 *
 * Return: 0 on success, negative on error.
 */
static inline int ufshcd_hba_capabilities(struct ufs_hba *hba)
{
	int err;

	hba->capabilities = ufshcd_readl(hba, REG_CONTROLLER_CAPABILITIES);

	/* nutrs and nutmrs are 0 based values */
	hba->nutrs = (hba->capabilities & MASK_TRANSFER_REQUESTS_SLOTS) + 1;
	hba->nutmrs =
	((hba->capabilities & MASK_TASK_MANAGEMENT_REQUEST_SLOTS) >> 16) + 1;

	/* Read crypto capabilities */
	err = ufshcd_hba_init_crypto_capabilities(hba);
	if (err)
		dev_err(hba->dev, "crypto setup failed\n");

	return err;
}

/**
 * ufshcd_ready_for_uic_cmd - Check if controller is ready
 *                            to accept UIC commands
 * @hba: per adapter instance
 * Return true on success, else false
 */
static inline bool ufshcd_ready_for_uic_cmd(struct ufs_hba *hba)
{
	if (ufshcd_readl(hba, REG_CONTROLLER_STATUS) & UIC_COMMAND_READY)
		return true;
	else
		return false;
}

/**
 * ufshcd_get_upmcrs - Get the power mode change request status
 * @hba: Pointer to adapter instance
 *
 * This function gets the UPMCRS field of HCS register
 * Returns value of UPMCRS field
 */
static inline u8 ufshcd_get_upmcrs(struct ufs_hba *hba)
{
	return (ufshcd_readl(hba, REG_CONTROLLER_STATUS) >> 8) & 0x7;
}

/**
 * ufshcd_dispatch_uic_cmd - Dispatch an UIC command to the Unipro layer
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 */
static inline void
ufshcd_dispatch_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
	lockdep_assert_held(&hba->uic_cmd_mutex);

	WARN_ON(hba->active_uic_cmd);

	hba->active_uic_cmd = uic_cmd;

	/* Write Args */
	ufshcd_writel(hba, uic_cmd->argument1, REG_UIC_COMMAND_ARG_1);
	ufshcd_writel(hba, uic_cmd->argument2, REG_UIC_COMMAND_ARG_2);
	ufshcd_writel(hba, uic_cmd->argument3, REG_UIC_COMMAND_ARG_3);

	ufshcd_add_uic_command_trace(hba, uic_cmd, UFS_CMD_SEND);

	/* Write UIC Cmd */
	ufshcd_writel(hba, uic_cmd->command & COMMAND_OPCODE_MASK,
		      REG_UIC_COMMAND);
}

/**
 * ufshcd_wait_for_uic_cmd - Wait for completion of an UIC command
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 *
 * Returns 0 only if success.
 */
static int
ufshcd_wait_for_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
	int ret;
	unsigned long flags;

	lockdep_assert_held(&hba->uic_cmd_mutex);

	if (wait_for_completion_timeout(&uic_cmd->done,
					msecs_to_jiffies(UIC_CMD_TIMEOUT))) {
		ret = uic_cmd->argument2 & MASK_UIC_COMMAND_RESULT;
	} else {
		ret = -ETIMEDOUT;
		dev_err(hba->dev,
			"uic cmd 0x%x with arg3 0x%x completion timeout\n",
			uic_cmd->command, uic_cmd->argument3);

		if (!uic_cmd->cmd_active) {
			dev_err(hba->dev, "%s: UIC cmd has been completed, return the result\n",
				__func__);
			ret = uic_cmd->argument2 & MASK_UIC_COMMAND_RESULT;
		}
	}

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->active_uic_cmd = NULL;
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	return ret;
}

/**
 * __ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 * @completion: initialize the completion only if this is set to true
 *
 * Returns 0 only if success.
 */
static int
__ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd,
		      bool completion)
{
	lockdep_assert_held(&hba->uic_cmd_mutex);
	lockdep_assert_held(hba->host->host_lock);

	if (!ufshcd_ready_for_uic_cmd(hba)) {
		dev_err(hba->dev,
			"Controller not ready to accept UIC commands\n");
		return -EIO;
	}

	if (completion)
		init_completion(&uic_cmd->done);

	uic_cmd->cmd_active = 1;
	ufshcd_dispatch_uic_cmd(hba, uic_cmd);

	return 0;
}

/**
 * ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 *
 * Returns 0 only if success.
 */
int ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
	int ret;
	unsigned long flags;

	if (hba->quirks & UFSHCD_QUIRK_BROKEN_UIC_CMD)
		return 0;

	ufshcd_hold(hba, false);
	mutex_lock(&hba->uic_cmd_mutex);
	ufshcd_add_delay_before_dme_cmd(hba);

	spin_lock_irqsave(hba->host->host_lock, flags);
	ret = __ufshcd_send_uic_cmd(hba, uic_cmd, true);
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	if (!ret)
		ret = ufshcd_wait_for_uic_cmd(hba, uic_cmd);

	mutex_unlock(&hba->uic_cmd_mutex);

	ufshcd_release(hba);
	return ret;
}

/**
 * ufshcd_map_sg - Map scatter-gather list to prdt
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 *
 * Returns 0 in case of success, non-zero value in case of failure
 */
static int ufshcd_map_sg(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	struct ufshcd_sg_entry *prd_table;
	struct scatterlist *sg;
	struct scsi_cmnd *cmd;
	int sg_segments;
	int i;

	cmd = lrbp->cmd;
	sg_segments = scsi_dma_map(cmd);
	if (sg_segments < 0)
		return sg_segments;

	if (sg_segments) {

		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN)
			lrbp->utr_descriptor_ptr->prd_table_length =
				cpu_to_le16((sg_segments *
					sizeof(struct ufshcd_sg_entry)));
		else
			lrbp->utr_descriptor_ptr->prd_table_length =
				cpu_to_le16(sg_segments);

		prd_table = lrbp->ucd_prdt_ptr;

		scsi_for_each_sg(cmd, sg, sg_segments, i) {
			const unsigned int len = sg_dma_len(sg);

			/*
			 * From the UFSHCI spec: "Data Byte Count (DBC): A '0'
			 * based value that indicates the length, in bytes, of
			 * the data block. A maximum of length of 256KB may
			 * exist for any entry. Bits 1:0 of this field shall be
			 * 11b to indicate Dword granularity. A value of '3'
			 * indicates 4 bytes, '7' indicates 8 bytes, etc."
			 */
			WARN_ONCE(len > 256 * 1024, "len = %#x\n", len);
			prd_table[i].size = cpu_to_le32(len - 1);
			prd_table[i].addr = cpu_to_le64(sg->dma_address);
			prd_table[i].reserved = 0;
		}
	} else {
		lrbp->utr_descriptor_ptr->prd_table_length = 0;
	}

	return 0;
}

/**
 * ufshcd_enable_intr - enable interrupts
 * @hba: per adapter instance
 * @intrs: interrupt bits
 */
static void ufshcd_enable_intr(struct ufs_hba *hba, u32 intrs)
{
	u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);

	if (hba->ufs_version == ufshci_version(1, 0)) {
		u32 rw;
		rw = set & INTERRUPT_MASK_RW_VER_10;
		set = rw | ((set ^ intrs) & intrs);
	} else {
		set |= intrs;
	}

	ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
}

/**
 * ufshcd_disable_intr - disable interrupts
 * @hba: per adapter instance
 * @intrs: interrupt bits
 */
static void ufshcd_disable_intr(struct ufs_hba *hba, u32 intrs)
{
	u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);

	if (hba->ufs_version == ufshci_version(1, 0)) {
		u32 rw;
		rw = (set & INTERRUPT_MASK_RW_VER_10) &
			~(intrs & INTERRUPT_MASK_RW_VER_10);
		set = rw | ((set & intrs) & ~INTERRUPT_MASK_RW_VER_10);

	} else {
		set &= ~intrs;
	}

	ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
}

/**
 * ufshcd_prepare_req_desc_hdr() - Fills the requests header
 * descriptor according to request
 * @lrbp: pointer to local reference block
 * @upiu_flags: flags required in the header
 * @cmd_dir: requests data direction
 */
static void ufshcd_prepare_req_desc_hdr(struct ufshcd_lrb *lrbp,
			u8 *upiu_flags, enum dma_data_direction cmd_dir)
{
	struct utp_transfer_req_desc *req_desc = lrbp->utr_descriptor_ptr;
	u32 data_direction;
	u32 dword_0;
	u32 dword_1 = 0;
	u32 dword_3 = 0;

	if (cmd_dir == DMA_FROM_DEVICE) {
		data_direction = UTP_DEVICE_TO_HOST;
		*upiu_flags = UPIU_CMD_FLAGS_READ;
	} else if (cmd_dir == DMA_TO_DEVICE) {
		data_direction = UTP_HOST_TO_DEVICE;
		*upiu_flags = UPIU_CMD_FLAGS_WRITE;
	} else {
		data_direction = UTP_NO_DATA_TRANSFER;
		*upiu_flags = UPIU_CMD_FLAGS_NONE;
	}

	dword_0 = data_direction | (lrbp->command_type
				<< UPIU_COMMAND_TYPE_OFFSET);
	if (lrbp->intr_cmd)
		dword_0 |= UTP_REQ_DESC_INT_CMD;

	/* Prepare crypto related dwords */
	ufshcd_prepare_req_desc_hdr_crypto(lrbp, &dword_0, &dword_1, &dword_3);

	/* Transfer request descriptor header fields */
	req_desc->header.dword_0 = cpu_to_le32(dword_0);
	req_desc->header.dword_1 = cpu_to_le32(dword_1);
	/*
	 * assigning invalid value for command status. Controller
	 * updates OCS on command completion, with the command
	 * status
	 */
	req_desc->header.dword_2 =
		cpu_to_le32(OCS_INVALID_COMMAND_STATUS);
	req_desc->header.dword_3 = cpu_to_le32(dword_3);

	req_desc->prd_table_length = 0;
}

/**
 * ufshcd_prepare_utp_scsi_cmd_upiu() - fills the utp_transfer_req_desc,
 * for scsi commands
 * @lrbp: local reference block pointer
 * @upiu_flags: flags
 */
static
void ufshcd_prepare_utp_scsi_cmd_upiu(struct ufshcd_lrb *lrbp, u8 upiu_flags)
{
	struct scsi_cmnd *cmd = lrbp->cmd;
	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
	unsigned short cdb_len;

	/* command descriptor fields */
	ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
				UPIU_TRANSACTION_COMMAND, upiu_flags,
				lrbp->lun, lrbp->task_tag);
	ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
				UPIU_COMMAND_SET_TYPE_SCSI, 0, 0, 0);

	/* Total EHS length and Data segment length will be zero */
	ucd_req_ptr->header.dword_2 = 0;

	ucd_req_ptr->sc.exp_data_transfer_len = cpu_to_be32(cmd->sdb.length);

	cdb_len = min_t(unsigned short, cmd->cmd_len, UFS_CDB_SIZE);
	memset(ucd_req_ptr->sc.cdb, 0, UFS_CDB_SIZE);
	memcpy(ucd_req_ptr->sc.cdb, cmd->cmnd, cdb_len);

	memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
}

/**
 * ufshcd_prepare_utp_query_req_upiu() - fills the utp_transfer_req_desc,
 * for query requsts
 * @hba: UFS hba
 * @lrbp: local reference block pointer
 * @upiu_flags: flags
 */
static void ufshcd_prepare_utp_query_req_upiu(struct ufs_hba *hba,
				struct ufshcd_lrb *lrbp, u8 upiu_flags)
{
	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
	struct ufs_query *query = &hba->dev_cmd.query;
	u16 len = be16_to_cpu(query->request.upiu_req.length);

	/* Query request header */
	ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
			UPIU_TRANSACTION_QUERY_REQ, upiu_flags,
			lrbp->lun, lrbp->task_tag);
	ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
			0, query->request.query_func, 0, 0);

	/* Data segment length only need for WRITE_DESC */
	if (query->request.upiu_req.opcode == UPIU_QUERY_OPCODE_WRITE_DESC)
		ucd_req_ptr->header.dword_2 =
			UPIU_HEADER_DWORD(0, 0, (len >> 8), (u8)len);
	else
		ucd_req_ptr->header.dword_2 = 0;

	/* Copy the Query Request buffer as is */
	memcpy(&ucd_req_ptr->qr, &query->request.upiu_req,
			QUERY_OSF_SIZE);

	/* Copy the Descriptor */
	if (query->request.upiu_req.opcode == UPIU_QUERY_OPCODE_WRITE_DESC)
		memcpy(ucd_req_ptr + 1, query->descriptor, len);

	memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
}

static inline void ufshcd_prepare_utp_nop_upiu(struct ufshcd_lrb *lrbp)
{
	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;

	memset(ucd_req_ptr, 0, sizeof(struct utp_upiu_req));

	/* command descriptor fields */
	ucd_req_ptr->header.dword_0 =
		UPIU_HEADER_DWORD(
			UPIU_TRANSACTION_NOP_OUT, 0, 0, lrbp->task_tag);
	/* clear rest of the fields of basic header */
	ucd_req_ptr->header.dword_1 = 0;
	ucd_req_ptr->header.dword_2 = 0;

	memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
}

/**
 * ufshcd_compose_devman_upiu - UFS Protocol Information Unit(UPIU)
 *			     for Device Management Purposes
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 */
static int ufshcd_compose_devman_upiu(struct ufs_hba *hba,
				      struct ufshcd_lrb *lrbp)
{
	u8 upiu_flags;
	int ret = 0;

	if (hba->ufs_version <= ufshci_version(1, 1))
		lrbp->command_type = UTP_CMD_TYPE_DEV_MANAGE;
	else
		lrbp->command_type = UTP_CMD_TYPE_UFS_STORAGE;

	ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE);
	if (hba->dev_cmd.type == DEV_CMD_TYPE_QUERY)
		ufshcd_prepare_utp_query_req_upiu(hba, lrbp, upiu_flags);
	else if (hba->dev_cmd.type == DEV_CMD_TYPE_NOP)
		ufshcd_prepare_utp_nop_upiu(lrbp);
	else
		ret = -EINVAL;

	return ret;
}

/**
 * ufshcd_comp_scsi_upiu - UFS Protocol Information Unit(UPIU)
 *			   for SCSI Purposes
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 */
static int ufshcd_comp_scsi_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	u8 upiu_flags;
	int ret = 0;

	if (hba->ufs_version <= ufshci_version(1, 1))
		lrbp->command_type = UTP_CMD_TYPE_SCSI;
	else
		lrbp->command_type = UTP_CMD_TYPE_UFS_STORAGE;

	if (likely(lrbp->cmd)) {
		ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags,
						lrbp->cmd->sc_data_direction);
		ufshcd_prepare_utp_scsi_cmd_upiu(lrbp, upiu_flags);
	} else {
		ret = -EINVAL;
	}

	return ret;
}

/**
 * ufshcd_upiu_wlun_to_scsi_wlun - maps UPIU W-LUN id to SCSI W-LUN ID
 * @upiu_wlun_id: UPIU W-LUN id
 *
 * Returns SCSI W-LUN id
 */
static inline u16 ufshcd_upiu_wlun_to_scsi_wlun(u8 upiu_wlun_id)
{
	return (upiu_wlun_id & ~UFS_UPIU_WLUN_ID) | SCSI_W_LUN_BASE;
}

static inline bool is_rpmb_wlun(struct scsi_device *sdev)
{
	return sdev->lun == ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_RPMB_WLUN);
}

static inline bool is_device_wlun(struct scsi_device *sdev)
{
	return sdev->lun ==
		ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_UFS_DEVICE_WLUN);
}

static void ufshcd_init_lrb(struct ufs_hba *hba, struct ufshcd_lrb *lrb, int i)
{
	struct utp_transfer_cmd_desc *cmd_descp = hba->ucdl_base_addr;
	struct utp_transfer_req_desc *utrdlp = hba->utrdl_base_addr;
	dma_addr_t cmd_desc_element_addr = hba->ucdl_dma_addr +
		i * sizeof(struct utp_transfer_cmd_desc);
	u16 response_offset = offsetof(struct utp_transfer_cmd_desc,
				       response_upiu);
	u16 prdt_offset = offsetof(struct utp_transfer_cmd_desc, prd_table);

	lrb->utr_descriptor_ptr = utrdlp + i;
	lrb->utrd_dma_addr = hba->utrdl_dma_addr +
		i * sizeof(struct utp_transfer_req_desc);
	lrb->ucd_req_ptr = (struct utp_upiu_req *)(cmd_descp + i);
	lrb->ucd_req_dma_addr = cmd_desc_element_addr;
	lrb->ucd_rsp_ptr = (struct utp_upiu_rsp *)cmd_descp[i].response_upiu;
	lrb->ucd_rsp_dma_addr = cmd_desc_element_addr + response_offset;
	lrb->ucd_prdt_ptr = cmd_descp[i].prd_table;
	lrb->ucd_prdt_dma_addr = cmd_desc_element_addr + prdt_offset;
}

/**
 * ufshcd_queuecommand - main entry point for SCSI requests
 * @host: SCSI host pointer
 * @cmd: command from SCSI Midlayer
 *
 * Returns 0 for success, non-zero in case of failure
 */
static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
{
	struct ufs_hba *hba = shost_priv(host);
	int tag = scsi_cmd_to_rq(cmd)->tag;
	struct ufshcd_lrb *lrbp;
	int err = 0;

	WARN_ONCE(tag < 0, "Invalid tag %d\n", tag);

	if (!down_read_trylock(&hba->clk_scaling_lock))
		return SCSI_MLQUEUE_HOST_BUSY;

	switch (hba->ufshcd_state) {
	case UFSHCD_STATE_OPERATIONAL:
		break;
	case UFSHCD_STATE_EH_SCHEDULED_NON_FATAL:
		/*
		 * SCSI error handler can call ->queuecommand() while UFS error
		 * handler is in progress. Error interrupts could change the
		 * state from UFSHCD_STATE_RESET to
		 * UFSHCD_STATE_EH_SCHEDULED_NON_FATAL. Prevent requests
		 * being issued in that case.
		 */
		if (ufshcd_eh_in_progress(hba)) {
			err = SCSI_MLQUEUE_HOST_BUSY;
			goto out;
		}
		break;
	case UFSHCD_STATE_EH_SCHEDULED_FATAL:
		/*
		 * pm_runtime_get_sync() is used at error handling preparation
		 * stage. If a scsi cmd, e.g. the SSU cmd, is sent from hba's
		 * PM ops, it can never be finished if we let SCSI layer keep
		 * retrying it, which gets err handler stuck forever. Neither
		 * can we let the scsi cmd pass through, because UFS is in bad
		 * state, the scsi cmd may eventually time out, which will get
		 * err handler blocked for too long. So, just fail the scsi cmd
		 * sent from PM ops, err handler can recover PM error anyways.
		 */
		if (hba->pm_op_in_progress) {
			hba->force_reset = true;
			set_host_byte(cmd, DID_BAD_TARGET);
			scsi_done(cmd);
			goto out;
		}
		fallthrough;
	case UFSHCD_STATE_RESET:
		err = SCSI_MLQUEUE_HOST_BUSY;
		goto out;
	case UFSHCD_STATE_ERROR:
		set_host_byte(cmd, DID_ERROR);
		scsi_done(cmd);
		goto out;
	}

	hba->req_abort_count = 0;

	err = ufshcd_hold(hba, true);
	if (err) {
		err = SCSI_MLQUEUE_HOST_BUSY;
		goto out;
	}
	WARN_ON(ufshcd_is_clkgating_allowed(hba) &&
		(hba->clk_gating.state != CLKS_ON));

	lrbp = &hba->lrb[tag];
	WARN_ON(lrbp->cmd);
	lrbp->cmd = cmd;
	lrbp->sense_bufflen = UFS_SENSE_SIZE;
	lrbp->sense_buffer = cmd->sense_buffer;
	lrbp->task_tag = tag;
	lrbp->lun = ufshcd_scsi_to_upiu_lun(cmd->device->lun);
	lrbp->intr_cmd = !ufshcd_is_intr_aggr_allowed(hba) ? true : false;

	ufshcd_prepare_lrbp_crypto(scsi_cmd_to_rq(cmd), lrbp);

	lrbp->req_abort_skip = false;

	ufshpb_prep(hba, lrbp);

	ufshcd_comp_scsi_upiu(hba, lrbp);

	err = ufshcd_map_sg(hba, lrbp);
	if (err) {
		lrbp->cmd = NULL;
		ufshcd_release(hba);
		goto out;
	}

	ufshcd_send_command(hba, tag);
out:
	up_read(&hba->clk_scaling_lock);

	if (ufs_trigger_eh()) {
		unsigned long flags;

		spin_lock_irqsave(hba->host->host_lock, flags);
		ufshcd_schedule_eh_work(hba);
		spin_unlock_irqrestore(hba->host->host_lock, flags);
	}

	return err;
}

static int ufshcd_compose_dev_cmd(struct ufs_hba *hba,
		struct ufshcd_lrb *lrbp, enum dev_cmd_type cmd_type, int tag)
{
	lrbp->cmd = NULL;
	lrbp->sense_bufflen = 0;
	lrbp->sense_buffer = NULL;
	lrbp->task_tag = tag;
	lrbp->lun = 0; /* device management cmd is not specific to any LUN */
	lrbp->intr_cmd = true; /* No interrupt aggregation */
	ufshcd_prepare_lrbp_crypto(NULL, lrbp);
	hba->dev_cmd.type = cmd_type;

	return ufshcd_compose_devman_upiu(hba, lrbp);
}

static int
ufshcd_clear_cmd(struct ufs_hba *hba, int tag)
{
	int err = 0;
	unsigned long flags;
	u32 mask = 1 << tag;

	/* clear outstanding transaction before retry */
	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_utrl_clear(hba, tag);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	/*
	 * wait for h/w to clear corresponding bit in door-bell.
	 * max. wait is 1 sec.
	 */
	err = ufshcd_wait_for_register(hba,
			REG_UTP_TRANSFER_REQ_DOOR_BELL,
			mask, ~mask, 1000, 1000);

	return err;
}

static int
ufshcd_check_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	struct ufs_query_res *query_res = &hba->dev_cmd.query.response;

	/* Get the UPIU response */
	query_res->response = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr) >>
				UPIU_RSP_CODE_OFFSET;
	return query_res->response;
}

/**
 * ufshcd_dev_cmd_completion() - handles device management command responses
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 */
static int
ufshcd_dev_cmd_completion(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	int resp;
	int err = 0;

	hba->ufs_stats.last_hibern8_exit_tstamp = ktime_set(0, 0);
	resp = ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr);

	switch (resp) {
	case UPIU_TRANSACTION_NOP_IN:
		if (hba->dev_cmd.type != DEV_CMD_TYPE_NOP) {
			err = -EINVAL;
			dev_err(hba->dev, "%s: unexpected response %x\n",
					__func__, resp);
		}
		break;
	case UPIU_TRANSACTION_QUERY_RSP:
		err = ufshcd_check_query_response(hba, lrbp);
		if (!err)
			err = ufshcd_copy_query_response(hba, lrbp);
		break;
	case UPIU_TRANSACTION_REJECT_UPIU:
		/* TODO: handle Reject UPIU Response */
		err = -EPERM;
		dev_err(hba->dev, "%s: Reject UPIU not fully implemented\n",
				__func__);
		break;
	default:
		err = -EINVAL;
		dev_err(hba->dev, "%s: Invalid device management cmd response: %x\n",
				__func__, resp);
		break;
	}

	return err;
}

static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba,
		struct ufshcd_lrb *lrbp, int max_timeout)
{
	int err = 0;
	unsigned long time_left;
	unsigned long flags;

	time_left = wait_for_completion_timeout(hba->dev_cmd.complete,
			msecs_to_jiffies(max_timeout));

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->dev_cmd.complete = NULL;
	if (likely(time_left)) {
		err = ufshcd_get_tr_ocs(lrbp);
		if (!err)
			err = ufshcd_dev_cmd_completion(hba, lrbp);
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	if (!time_left) {
		err = -ETIMEDOUT;
		dev_dbg(hba->dev, "%s: dev_cmd request timedout, tag %d\n",
			__func__, lrbp->task_tag);
		if (!ufshcd_clear_cmd(hba, lrbp->task_tag))
			/* successfully cleared the command, retry if needed */
			err = -EAGAIN;
		/*
		 * in case of an error, after clearing the doorbell,
		 * we also need to clear the outstanding_request
		 * field in hba
		 */
		spin_lock_irqsave(&hba->outstanding_lock, flags);
		__clear_bit(lrbp->task_tag, &hba->outstanding_reqs);
		spin_unlock_irqrestore(&hba->outstanding_lock, flags);
	}

	return err;
}

/**
 * ufshcd_exec_dev_cmd - API for sending device management requests
 * @hba: UFS hba
 * @cmd_type: specifies the type (NOP, Query...)
 * @timeout: timeout in milliseconds
 *
 * NOTE: Since there is only one available tag for device management commands,
 * it is expected you hold the hba->dev_cmd.lock mutex.
 */
static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
		enum dev_cmd_type cmd_type, int timeout)
{
	struct request_queue *q = hba->cmd_queue;
	DECLARE_COMPLETION_ONSTACK(wait);
	struct request *req;
	struct ufshcd_lrb *lrbp;
	int err;
	int tag;

	down_read(&hba->clk_scaling_lock);

	/*
	 * Get free slot, sleep if slots are unavailable.
	 * Even though we use wait_event() which sleeps indefinitely,
	 * the maximum wait time is bounded by SCSI request timeout.
	 */
	req = blk_mq_alloc_request(q, REQ_OP_DRV_OUT, 0);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto out_unlock;
	}
	tag = req->tag;
	WARN_ONCE(tag < 0, "Invalid tag %d\n", tag);
	/* Set the timeout such that the SCSI error handler is not activated. */
	req->timeout = msecs_to_jiffies(2 * timeout);
	blk_mq_start_request(req);

	lrbp = &hba->lrb[tag];
	WARN_ON(lrbp->cmd);
	err = ufshcd_compose_dev_cmd(hba, lrbp, cmd_type, tag);
	if (unlikely(err))
		goto out;

	hba->dev_cmd.complete = &wait;

	ufshcd_add_query_upiu_trace(hba, UFS_QUERY_SEND, lrbp->ucd_req_ptr);

	ufshcd_send_command(hba, tag);
	err = ufshcd_wait_for_dev_cmd(hba, lrbp, timeout);
	ufshcd_add_query_upiu_trace(hba, err ? UFS_QUERY_ERR : UFS_QUERY_COMP,
				    (struct utp_upiu_req *)lrbp->ucd_rsp_ptr);

out:
	blk_mq_free_request(req);
out_unlock:
	up_read(&hba->clk_scaling_lock);
	return err;
}

/**
 * ufshcd_init_query() - init the query response and request parameters
 * @hba: per-adapter instance
 * @request: address of the request pointer to be initialized
 * @response: address of the response pointer to be initialized
 * @opcode: operation to perform
 * @idn: flag idn to access
 * @index: LU number to access
 * @selector: query/flag/descriptor further identification
 */
static inline void ufshcd_init_query(struct ufs_hba *hba,
		struct ufs_query_req **request, struct ufs_query_res **response,
		enum query_opcode opcode, u8 idn, u8 index, u8 selector)
{
	*request = &hba->dev_cmd.query.request;
	*response = &hba->dev_cmd.query.response;
	memset(*request, 0, sizeof(struct ufs_query_req));
	memset(*response, 0, sizeof(struct ufs_query_res));
	(*request)->upiu_req.opcode = opcode;
	(*request)->upiu_req.idn = idn;
	(*request)->upiu_req.index = index;
	(*request)->upiu_req.selector = selector;
}

static int ufshcd_query_flag_retry(struct ufs_hba *hba,
	enum query_opcode opcode, enum flag_idn idn, u8 index, bool *flag_res)
{
	int ret;
	int retries;

	for (retries = 0; retries < QUERY_REQ_RETRIES; retries++) {
		ret = ufshcd_query_flag(hba, opcode, idn, index, flag_res);
		if (ret)
			dev_dbg(hba->dev,
				"%s: failed with error %d, retries %d\n",
				__func__, ret, retries);
		else
			break;
	}

	if (ret)
		dev_err(hba->dev,
			"%s: query attribute, opcode %d, idn %d, failed with error %d after %d retires\n",
			__func__, opcode, idn, ret, retries);
	return ret;
}

/**
 * ufshcd_query_flag() - API function for sending flag query requests
 * @hba: per-adapter instance
 * @opcode: flag query to perform
 * @idn: flag idn to access
 * @index: flag index to access
 * @flag_res: the flag value after the query request completes
 *
 * Returns 0 for success, non-zero in case of failure
 */
int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
			enum flag_idn idn, u8 index, bool *flag_res)
{
	struct ufs_query_req *request = NULL;
	struct ufs_query_res *response = NULL;
	int err, selector = 0;
	int timeout = QUERY_REQ_TIMEOUT;

	BUG_ON(!hba);

	ufshcd_hold(hba, false);
	mutex_lock(&hba->dev_cmd.lock);
	ufshcd_init_query(hba, &request, &response, opcode, idn, index,
			selector);

	switch (opcode) {
	case UPIU_QUERY_OPCODE_SET_FLAG:
	case UPIU_QUERY_OPCODE_CLEAR_FLAG:
	case UPIU_QUERY_OPCODE_TOGGLE_FLAG:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
		break;
	case UPIU_QUERY_OPCODE_READ_FLAG:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
		if (!flag_res) {
			/* No dummy reads */
			dev_err(hba->dev, "%s: Invalid argument for read request\n",
					__func__);
			err = -EINVAL;
			goto out_unlock;
		}
		break;
	default:
		dev_err(hba->dev,
			"%s: Expected query flag opcode but got = %d\n",
			__func__, opcode);
		err = -EINVAL;
		goto out_unlock;
	}

	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, timeout);

	if (err) {
		dev_err(hba->dev,
			"%s: Sending flag query for idn %d failed, err = %d\n",
			__func__<