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Date: Thu, 11 Jul 2013 19:03:39 +0530
From: Santosh Y <santoshsy@...il.com>
To: Tanya Brokhman <tlinder@...eaurora.org>
Cc: axboe@...nel.dk, linux-arm-msm@...r.kernel.org,
linux-mmc@...r.kernel.org,
open list <linux-kernel@...r.kernel.org>,
"open list:UNIVERSAL FLASH S..." <linux-scsi@...r.kernel.org>
Subject: Re: [RFC/PATCH 4/4] block: Add URGENT request notification support to
CFQ scheduler
On Thu, Jul 11, 2013 at 6:31 PM, Tanya Brokhman <tlinder@...eaurora.org> wrote:
> When the scheduler reports to the block layer that there is an urgent
> request pending, the device driver may decide to stop the transmission
> of the current request in order to handle the urgent one. This is done
> in order to reduce the latency of an urgent request. For example:
> long WRITE may be stopped to handle an urgent READ.
>
> Signed-off-by: Tatyana Brokhman <tlinder@...eaurora.org>
>
> diff --git a/block/blk-core.c b/block/blk-core.c
> index 3ab3a62..705f4f9 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -2090,7 +2090,10 @@ static void blk_account_io_completion(struct request *req, unsigned int bytes)
>
> cpu = part_stat_lock();
> part = req->part;
> - part_stat_add(cpu, part, sectors[rw], bytes >> 9);
> + if (part == NULL)
> + pr_err("%s: YANIV - BUG START", __func__);
> + else
> + part_stat_add(cpu, part, sectors[rw], bytes >> 9);
> part_stat_unlock();
> }
> }
> @@ -2111,12 +2114,13 @@ static void blk_account_io_done(struct request *req)
> cpu = part_stat_lock();
> part = req->part;
>
> - part_stat_inc(cpu, part, ios[rw]);
> - part_stat_add(cpu, part, ticks[rw], duration);
> - part_round_stats(cpu, part);
> - part_dec_in_flight(part, rw);
> -
> - hd_struct_put(part);
> + if (req->part != NULL) {
> + part_stat_inc(cpu, part, ios[rw]);
> + part_stat_add(cpu, part, ticks[rw], duration);
> + part_round_stats(cpu, part);
> + part_dec_in_flight(part, rw);
> + hd_struct_put(part);
> + }
> part_stat_unlock();
> }
> }
> diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
> index d5bbdcf..f936cb9 100644
> --- a/block/cfq-iosched.c
> +++ b/block/cfq-iosched.c
> @@ -320,6 +320,9 @@ struct cfq_data {
> unsigned long workload_expires;
> struct cfq_group *serving_group;
>
> + unsigned int nr_urgent_pending;
> + unsigned int nr_urgent_in_flight;
> +
> /*
> * Each priority tree is sorted by next_request position. These
> * trees are used when determining if two or more queues are
> @@ -2783,6 +2786,14 @@ static void cfq_dispatch_insert(struct request_queue *q, struct request *rq)
> (RQ_CFQG(rq))->dispatched++;
> elv_dispatch_sort(q, rq);
>
> + if (rq->cmd_flags & REQ_URGENT) {
> + if (!cfqd->nr_urgent_pending)
> + WARN_ON(1);
> + else
> + cfqd->nr_urgent_pending--;
> + cfqd->nr_urgent_in_flight++;
> + }
> +
> cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]++;
> cfqq->nr_sectors += blk_rq_sectors(rq);
> cfqg_stats_update_dispatch(cfqq->cfqg, blk_rq_bytes(rq), rq->cmd_flags);
> @@ -3909,6 +3920,68 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
> }
> }
>
> +/*
> + * Called when a request (rq) is reinserted (to cfqq). Check if there's
> + * something we should do about it
> + */
> +static void
> +cfq_rq_requeued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
> + struct request *rq)
> +{
> + struct cfq_io_cq *cic = RQ_CIC(rq);
> +
> + cfqd->rq_queued++;
> + if (rq->cmd_flags & REQ_PRIO)
> + cfqq->prio_pending++;
> +
> + cfqq->dispatched--;
> + (RQ_CFQG(rq))->dispatched--;
> +
> + cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--;
> +
> + cfq_update_io_thinktime(cfqd, cfqq, cic);
> + cfq_update_io_seektime(cfqd, cfqq, rq);
> + cfq_update_idle_window(cfqd, cfqq, cic);
> +
> + cfqq->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq);
> +
> + if (cfqq == cfqd->active_queue) {
> + if (cfq_cfqq_wait_request(cfqq)) {
> + if (blk_rq_bytes(rq) > PAGE_CACHE_SIZE ||
> + cfqd->busy_queues > 1) {
> + cfq_del_timer(cfqd, cfqq);
> + cfq_clear_cfqq_wait_request(cfqq);
> + } else {
> + cfqg_stats_update_idle_time(cfqq->cfqg);
> + cfq_mark_cfqq_must_dispatch(cfqq);
> + }
> + }
> + } else if (cfq_should_preempt(cfqd, cfqq, rq)) {
> + cfq_preempt_queue(cfqd, cfqq);
> + }
> +}
> +
> +static int cfq_reinsert_request(struct request_queue *q, struct request *rq)
> +{
> + struct cfq_data *cfqd = q->elevator->elevator_data;
> + struct cfq_queue *cfqq = RQ_CFQQ(rq);
> +
> + if (!cfqq || cfqq->cfqd != cfqd)
> + return -EIO;
> +
> + cfq_log_cfqq(cfqd, cfqq, "re-insert_request");
> + list_add(&rq->queuelist, &cfqq->fifo);
> + cfq_add_rq_rb(rq);
> +
> + cfq_rq_requeued(cfqd, cfqq, rq);
> + if (rq->cmd_flags & REQ_URGENT) {
> + if (cfqd->nr_urgent_in_flight)
> + cfqd->nr_urgent_in_flight--;
> + cfqd->nr_urgent_pending++;
> + }
> + return 0;
> +}
> +
> static void cfq_insert_request(struct request_queue *q, struct request *rq)
> {
> struct cfq_data *cfqd = q->elevator->elevator_data;
> @@ -3923,6 +3996,43 @@ static void cfq_insert_request(struct request_queue *q, struct request *rq)
> cfqg_stats_update_io_add(RQ_CFQG(rq), cfqd->serving_group,
> rq->cmd_flags);
> cfq_rq_enqueued(cfqd, cfqq, rq);
> +
> + if (rq->cmd_flags & REQ_URGENT) {
> + WARN_ON(1);
> + blk_dump_rq_flags(rq, "");
> + rq->cmd_flags &= ~REQ_URGENT;
> + }
> +
> + /*
> + * Request is considered URGENT if:
> + * 1. The queue being served is of a lower IO priority then the new
> + * request
> + * OR:
> + * 2. The workload being performed is ASYNC
> + * Only READ requests may be considered as URGENT
> + */
> + if ((cfqd->active_queue &&
> + cfqq->ioprio_class < cfqd->active_queue->ioprio_class) ||
> + (cfqd->serving_wl_type == ASYNC_WORKLOAD &&
> + rq_data_dir(rq) == READ)) {
> + rq->cmd_flags |= REQ_URGENT;
> + cfqd->nr_urgent_pending++;
> + }
> +}
> +
> +/**
> + * cfq_urgent_pending() - Return TRUE if there is an urgent
> + * request on scheduler
> + * @q: requests queue
> + */
> +static bool cfq_urgent_pending(struct request_queue *q)
> +{
> + struct cfq_data *cfqd = q->elevator->elevator_data;
> +
> + if (cfqd->nr_urgent_pending && !cfqd->nr_urgent_in_flight)
> + return true;
> +
> + return false;
> }
>
> /*
> @@ -4006,6 +4116,14 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
> const int sync = rq_is_sync(rq);
> unsigned long now;
>
> + if (rq->cmd_flags & REQ_URGENT) {
> + if (!cfqd->nr_urgent_in_flight)
> + WARN_ON(1);
> + else
> + cfqd->nr_urgent_in_flight--;
> + rq->cmd_flags &= ~REQ_URGENT;
> + }
> +
> now = jiffies;
> cfq_log_cfqq(cfqd, cfqq, "complete rqnoidle %d",
> !!(rq->cmd_flags & REQ_NOIDLE));
> @@ -4550,6 +4668,8 @@ static struct elevator_type iosched_cfq = {
> .elevator_bio_merged_fn = cfq_bio_merged,
> .elevator_dispatch_fn = cfq_dispatch_requests,
> .elevator_add_req_fn = cfq_insert_request,
> + .elevator_reinsert_req_fn = cfq_reinsert_request,
> + .elevator_is_urgent_fn = cfq_urgent_pending,
> .elevator_activate_req_fn = cfq_activate_request,
> .elevator_deactivate_req_fn = cfq_deactivate_request,
> .elevator_completed_req_fn = cfq_completed_request,
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index b743bd6..c32a478 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -33,16 +33,8 @@
> * this program.
> */
>
> -#include <linux/async.h>
> -
> #include "ufshcd.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
> -
> enum {
> UFSHCD_MAX_CHANNEL = 0,
> UFSHCD_MAX_ID = 1,
> @@ -72,20 +64,6 @@ enum {
> };
>
> /**
> - * 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_10)
> - return INTERRUPT_MASK_ALL_VER_10;
> - else
> - return INTERRUPT_MASK_ALL_VER_11;
> -}
> -
> -/**
> * ufshcd_get_ufs_version - Get the UFS version supported by the HBA
> * @hba - Pointer to adapter instance
> *
> @@ -93,7 +71,7 @@ static inline u32 ufshcd_get_intr_mask(struct ufs_hba *hba)
> */
> static inline u32 ufshcd_get_ufs_version(struct ufs_hba *hba)
> {
> - return ufshcd_readl(hba, REG_UFS_VERSION);
> + return readl(hba->mmio_base + REG_UFS_VERSION);
> }
>
> /**
> @@ -152,7 +130,8 @@ static inline int ufshcd_get_tm_free_slot(struct ufs_hba *hba)
> */
> static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 pos)
> {
> - ufshcd_writel(hba, ~(1 << pos), REG_UTP_TRANSFER_REQ_LIST_CLEAR);
> + writel(~(1 << pos),
> + (hba->mmio_base + REG_UTP_TRANSFER_REQ_LIST_CLEAR));
> }
>
> /**
> @@ -186,11 +165,43 @@ static inline int ufshcd_get_lists_status(u32 reg)
> */
> static inline int ufshcd_get_uic_cmd_result(struct ufs_hba *hba)
> {
> - return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_2) &
> + return readl(hba->mmio_base + REG_UIC_COMMAND_ARG_2) &
> MASK_UIC_COMMAND_RESULT;
> }
>
> /**
> + * ufshcd_free_hba_memory - Free allocated memory for LRB, request
> + * and task lists
> + * @hba: Pointer to adapter instance
> + */
> +static inline void ufshcd_free_hba_memory(struct ufs_hba *hba)
> +{
> + size_t utmrdl_size, utrdl_size, ucdl_size;
> +
> + kfree(hba->lrb);
> +
> + if (hba->utmrdl_base_addr) {
> + utmrdl_size = sizeof(struct utp_task_req_desc) * hba->nutmrs;
> + dma_free_coherent(hba->dev, utmrdl_size,
> + hba->utmrdl_base_addr, hba->utmrdl_dma_addr);
> + }
> +
> + if (hba->utrdl_base_addr) {
> + utrdl_size =
> + (sizeof(struct utp_transfer_req_desc) * hba->nutrs);
> + dma_free_coherent(hba->dev, utrdl_size,
> + hba->utrdl_base_addr, hba->utrdl_dma_addr);
> + }
> +
> + if (hba->ucdl_base_addr) {
> + ucdl_size =
> + (sizeof(struct utp_transfer_cmd_desc) * hba->nutrs);
> + dma_free_coherent(hba->dev, ucdl_size,
> + hba->ucdl_base_addr, hba->ucdl_dma_addr);
> + }
> +}
> +
> +/**
> * ufshcd_is_valid_req_rsp - checks if controller TR response is valid
> * @ucd_rsp_ptr: pointer to response UPIU
> *
> @@ -232,15 +243,18 @@ ufshcd_config_int_aggr(struct ufs_hba *hba, int option)
> {
> switch (option) {
> case INT_AGGR_RESET:
> - ufshcd_writel(hba, INT_AGGR_ENABLE |
> - INT_AGGR_COUNTER_AND_TIMER_RESET,
> - REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
> + writel((INT_AGGR_ENABLE |
> + INT_AGGR_COUNTER_AND_TIMER_RESET),
> + (hba->mmio_base +
> + REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL));
> break;
> case INT_AGGR_CONFIG:
> - ufshcd_writel(hba, INT_AGGR_ENABLE | INT_AGGR_PARAM_WRITE |
> - INT_AGGR_COUNTER_THRESHOLD_VALUE |
> - INT_AGGR_TIMEOUT_VALUE,
> - REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
> + writel((INT_AGGR_ENABLE |
> + INT_AGGR_PARAM_WRITE |
> + INT_AGGR_COUNTER_THRESHOLD_VALUE |
> + INT_AGGR_TIMEOUT_VALUE),
> + (hba->mmio_base +
> + REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL));
> break;
> }
> }
> @@ -253,10 +267,12 @@ ufshcd_config_int_aggr(struct ufs_hba *hba, int option)
> */
> 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);
> + writel(UTP_TASK_REQ_LIST_RUN_STOP_BIT,
> + (hba->mmio_base +
> + REG_UTP_TASK_REQ_LIST_RUN_STOP));
> + writel(UTP_TRANSFER_REQ_LIST_RUN_STOP_BIT,
> + (hba->mmio_base +
> + REG_UTP_TRANSFER_REQ_LIST_RUN_STOP));
> }
>
> /**
> @@ -265,7 +281,7 @@ static void ufshcd_enable_run_stop_reg(struct ufs_hba *hba)
> */
> static inline void ufshcd_hba_start(struct ufs_hba *hba)
> {
> - ufshcd_writel(hba, CONTROLLER_ENABLE, REG_CONTROLLER_ENABLE);
> + writel(CONTROLLER_ENABLE , (hba->mmio_base + REG_CONTROLLER_ENABLE));
> }
>
> /**
> @@ -276,7 +292,7 @@ static inline void ufshcd_hba_start(struct ufs_hba *hba)
> */
> static inline int ufshcd_is_hba_active(struct ufs_hba *hba)
> {
> - return (ufshcd_readl(hba, REG_CONTROLLER_ENABLE) & 0x1) ? 0 : 1;
> + return (readl(hba->mmio_base + REG_CONTROLLER_ENABLE) & 0x1) ? 0 : 1;
> }
>
> /**
> @@ -288,7 +304,8 @@ static inline
> void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
> {
> __set_bit(task_tag, &hba->outstanding_reqs);
> - ufshcd_writel(hba, 1 << task_tag, REG_UTP_TRANSFER_REQ_DOOR_BELL);
> + writel((1 << task_tag),
> + (hba->mmio_base + REG_UTP_TRANSFER_REQ_DOOR_BELL));
> }
>
> /**
> @@ -312,7 +329,8 @@ static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp)
> */
> static inline void ufshcd_hba_capabilities(struct ufs_hba *hba)
> {
> - hba->capabilities = ufshcd_readl(hba, REG_CONTROLLER_CAPABILITIES);
> + hba->capabilities =
> + readl(hba->mmio_base + REG_CONTROLLER_CAPABILITIES);
>
> /* nutrs and nutmrs are 0 based values */
> hba->nutrs = (hba->capabilities & MASK_TRANSFER_REQUESTS_SLOTS) + 1;
> @@ -321,119 +339,24 @@ static inline void ufshcd_hba_capabilities(struct ufs_hba *hba)
> }
>
> /**
> - * ufshcd_ready_for_uic_cmd - Check if controller is ready
> - * to accept UIC commands
> + * ufshcd_send_uic_command - Send UIC commands to unipro layers
> * @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_dispatch_uic_cmd - Dispatch UIC commands to unipro layers
> - * @hba: per adapter instance
> - * @uic_cmd: UIC command
> - *
> - * Mutex must be held.
> + * @uic_command: UIC command
> */
> static inline void
> -ufshcd_dispatch_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
> +ufshcd_send_uic_command(struct ufs_hba *hba, struct uic_command *uic_cmnd)
> {
> - 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);
> + writel(uic_cmnd->argument1,
> + (hba->mmio_base + REG_UIC_COMMAND_ARG_1));
> + writel(uic_cmnd->argument2,
> + (hba->mmio_base + REG_UIC_COMMAND_ARG_2));
> + writel(uic_cmnd->argument3,
> + (hba->mmio_base + REG_UIC_COMMAND_ARG_3));
>
> /* Write UIC Cmd */
> - ufshcd_writel(hba, uic_cmd->command & COMMAND_OPCODE_MASK,
> - REG_UIC_COMMAND);
> -}
> -
> -/**
> - * ufshcd_wait_for_uic_cmd - Wait complectioin of UIC command
> - * @hba: per adapter instance
> - * @uic_command: UIC command
> - *
> - * Must be called with mutex held.
> - * 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;
> -
> - 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;
> -
> - 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
> - *
> - * Identical to ufshcd_send_uic_cmd() expect mutex. Must be called
> - * with mutex held.
> - * Returns 0 only if success.
> - */
> -static int
> -__ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
> -{
> - int ret;
> - unsigned long flags;
> -
> - if (!ufshcd_ready_for_uic_cmd(hba)) {
> - dev_err(hba->dev,
> - "Controller not ready to accept UIC commands\n");
> - return -EIO;
> - }
> -
> - init_completion(&uic_cmd->done);
> -
> - spin_lock_irqsave(hba->host->host_lock, flags);
> - ufshcd_dispatch_uic_cmd(hba, uic_cmd);
> - spin_unlock_irqrestore(hba->host->host_lock, flags);
> -
> - ret = ufshcd_wait_for_uic_cmd(hba, uic_cmd);
> -
> - return ret;
> -}
> -
> -/**
> - * ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
> - * @hba: per adapter instance
> - * @uic_cmd: UIC command
> - *
> - * Returns 0 only if success.
> - */
> -static int
> -ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
> -{
> - int ret;
> -
> - mutex_lock(&hba->uic_cmd_mutex);
> - ret = __ufshcd_send_uic_cmd(hba, uic_cmd);
> - mutex_unlock(&hba->uic_cmd_mutex);
> -
> - return ret;
> + writel((uic_cmnd->command & COMMAND_OPCODE_MASK),
> + (hba->mmio_base + REG_UIC_COMMAND));
> }
>
> /**
> @@ -477,45 +400,26 @@ static int ufshcd_map_sg(struct ufshcd_lrb *lrbp)
> }
>
> /**
> - * 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_10) {
> - 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
> + * ufshcd_int_config - enable/disable interrupts
> * @hba: per adapter instance
> - * @intrs: interrupt bits
> + * @option: interrupt option
> */
> -static void ufshcd_disable_intr(struct ufs_hba *hba, u32 intrs)
> +static void ufshcd_int_config(struct ufs_hba *hba, u32 option)
> {
> - u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);
> -
> - if (hba->ufs_version == UFSHCI_VERSION_10) {
> - 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;
> + switch (option) {
> + case UFSHCD_INT_ENABLE:
> + writel(hba->int_enable_mask,
> + (hba->mmio_base + REG_INTERRUPT_ENABLE));
> + break;
> + case UFSHCD_INT_DISABLE:
> + if (hba->ufs_version == UFSHCI_VERSION_10)
> + writel(INTERRUPT_DISABLE_MASK_10,
> + (hba->mmio_base + REG_INTERRUPT_ENABLE));
> + else
> + writel(INTERRUPT_DISABLE_MASK_11,
> + (hba->mmio_base + REG_INTERRUPT_ENABLE));
> + break;
> }
> -
> - ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
> }
>
> /**
> @@ -658,10 +562,10 @@ static int ufshcd_memory_alloc(struct ufs_hba *hba)
>
> /* Allocate memory for UTP command descriptors */
> ucdl_size = (sizeof(struct utp_transfer_cmd_desc) * hba->nutrs);
> - hba->ucdl_base_addr = dmam_alloc_coherent(hba->dev,
> - ucdl_size,
> - &hba->ucdl_dma_addr,
> - GFP_KERNEL);
> + hba->ucdl_base_addr = dma_alloc_coherent(hba->dev,
> + ucdl_size,
> + &hba->ucdl_dma_addr,
> + GFP_KERNEL);
>
> /*
> * UFSHCI requires UTP command descriptor to be 128 byte aligned.
> @@ -681,10 +585,10 @@ static int ufshcd_memory_alloc(struct ufs_hba *hba)
> * UFSHCI requires 1024 byte alignment of UTRD
> */
> utrdl_size = (sizeof(struct utp_transfer_req_desc) * hba->nutrs);
> - hba->utrdl_base_addr = dmam_alloc_coherent(hba->dev,
> - utrdl_size,
> - &hba->utrdl_dma_addr,
> - GFP_KERNEL);
> + hba->utrdl_base_addr = dma_alloc_coherent(hba->dev,
> + utrdl_size,
> + &hba->utrdl_dma_addr,
> + GFP_KERNEL);
> if (!hba->utrdl_base_addr ||
> WARN_ON(hba->utrdl_dma_addr & (PAGE_SIZE - 1))) {
> dev_err(hba->dev,
> @@ -697,10 +601,10 @@ static int ufshcd_memory_alloc(struct ufs_hba *hba)
> * UFSHCI requires 1024 byte alignment of UTMRD
> */
> utmrdl_size = sizeof(struct utp_task_req_desc) * hba->nutmrs;
> - hba->utmrdl_base_addr = dmam_alloc_coherent(hba->dev,
> - utmrdl_size,
> - &hba->utmrdl_dma_addr,
> - GFP_KERNEL);
> + hba->utmrdl_base_addr = dma_alloc_coherent(hba->dev,
> + utmrdl_size,
> + &hba->utmrdl_dma_addr,
> + GFP_KERNEL);
> if (!hba->utmrdl_base_addr ||
> WARN_ON(hba->utmrdl_dma_addr & (PAGE_SIZE - 1))) {
> dev_err(hba->dev,
> @@ -709,15 +613,14 @@ static int ufshcd_memory_alloc(struct ufs_hba *hba)
> }
>
> /* Allocate memory for local reference block */
> - hba->lrb = devm_kzalloc(hba->dev,
> - hba->nutrs * sizeof(struct ufshcd_lrb),
> - GFP_KERNEL);
> + hba->lrb = kcalloc(hba->nutrs, sizeof(struct ufshcd_lrb), GFP_KERNEL);
> if (!hba->lrb) {
> dev_err(hba->dev, "LRB Memory allocation failed\n");
> goto out;
> }
> return 0;
> out:
> + ufshcd_free_hba_memory(hba);
> return -ENOMEM;
> }
>
> @@ -771,7 +674,7 @@ static void ufshcd_host_memory_configure(struct ufs_hba *hba)
> utrdlp[i].prd_table_offset =
> cpu_to_le16((prdt_offset >> 2));
> utrdlp[i].response_upiu_length =
> - cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
> + cpu_to_le16(ALIGNED_UPIU_SIZE);
>
> hba->lrb[i].utr_descriptor_ptr = (utrdlp + i);
> hba->lrb[i].ucd_cmd_ptr =
> @@ -796,16 +699,35 @@ static void ufshcd_host_memory_configure(struct ufs_hba *hba)
> */
> static int ufshcd_dme_link_startup(struct ufs_hba *hba)
> {
> - struct uic_command uic_cmd = {0};
> - int ret;
> -
> - uic_cmd.command = UIC_CMD_DME_LINK_STARTUP;
> + struct uic_command *uic_cmd;
> + unsigned long flags;
>
> - ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
> - if (ret)
> + /* check if controller is ready to accept UIC commands */
> + if (((readl(hba->mmio_base + REG_CONTROLLER_STATUS)) &
> + UIC_COMMAND_READY) == 0x0) {
> dev_err(hba->dev,
> - "dme-link-startup: error code %d\n", ret);
> - return ret;
> + "Controller not ready"
> + " to accept UIC commands\n");
> + return -EIO;
> + }
> +
> + spin_lock_irqsave(hba->host->host_lock, flags);
> +
> + /* form UIC command */
> + uic_cmd = &hba->active_uic_cmd;
> + uic_cmd->command = UIC_CMD_DME_LINK_STARTUP;
> + uic_cmd->argument1 = 0;
> + uic_cmd->argument2 = 0;
> + uic_cmd->argument3 = 0;
> +
> + /* enable UIC related interrupts */
> + hba->int_enable_mask |= UIC_COMMAND_COMPL;
> + ufshcd_int_config(hba, UFSHCD_INT_ENABLE);
> +
> + /* sending UIC commands to controller */
> + ufshcd_send_uic_command(hba, uic_cmd);
> + spin_unlock_irqrestore(hba->host->host_lock, flags);
> + return 0;
> }
>
> /**
> @@ -814,10 +736,9 @@ static int ufshcd_dme_link_startup(struct ufs_hba *hba)
> *
> * To bring UFS host controller to operational state,
> * 1. Check if device is present
> - * 2. Enable required interrupts
> - * 3. Configure interrupt aggregation
> - * 4. Program UTRL and UTMRL base addres
> - * 5. Configure run-stop-registers
> + * 2. Configure run-stop-registers
> + * 3. Enable required interrupts
> + * 4. Configure interrupt aggregation
> *
> * Returns 0 on success, non-zero value on failure
> */
> @@ -827,29 +748,13 @@ static int ufshcd_make_hba_operational(struct ufs_hba *hba)
> u32 reg;
>
> /* check if device present */
> - reg = ufshcd_readl(hba, REG_CONTROLLER_STATUS);
> + reg = readl((hba->mmio_base + REG_CONTROLLER_STATUS));
> if (!ufshcd_is_device_present(reg)) {
> dev_err(hba->dev, "cc: Device not present\n");
> err = -ENXIO;
> goto out;
> }
>
> - /* Enable required interrupts */
> - ufshcd_enable_intr(hba, UFSHCD_ENABLE_INTRS);
> -
> - /* Configure interrupt aggregation */
> - ufshcd_config_int_aggr(hba, INT_AGGR_CONFIG);
> -
> - /* Configure UTRL and UTMRL base address registers */
> - ufshcd_writel(hba, lower_32_bits(hba->utrdl_dma_addr),
> - REG_UTP_TRANSFER_REQ_LIST_BASE_L);
> - ufshcd_writel(hba, upper_32_bits(hba->utrdl_dma_addr),
> - REG_UTP_TRANSFER_REQ_LIST_BASE_H);
> - ufshcd_writel(hba, lower_32_bits(hba->utmrdl_dma_addr),
> - REG_UTP_TASK_REQ_LIST_BASE_L);
> - ufshcd_writel(hba, upper_32_bits(hba->utmrdl_dma_addr),
> - REG_UTP_TASK_REQ_LIST_BASE_H);
> -
> /*
> * UCRDY, UTMRLDY and UTRLRDY bits must be 1
> * DEI, HEI bits must be 0
> @@ -863,11 +768,23 @@ static int ufshcd_make_hba_operational(struct ufs_hba *hba)
> goto out;
> }
>
> + /* Enable required interrupts */
> + hba->int_enable_mask |= (UTP_TRANSFER_REQ_COMPL |
> + UIC_ERROR |
> + UTP_TASK_REQ_COMPL |
> + DEVICE_FATAL_ERROR |
> + CONTROLLER_FATAL_ERROR |
> + SYSTEM_BUS_FATAL_ERROR);
> + ufshcd_int_config(hba, UFSHCD_INT_ENABLE);
> +
> + /* Configure interrupt aggregation */
> + ufshcd_config_int_aggr(hba, INT_AGGR_CONFIG);
> +
> if (hba->ufshcd_state == UFSHCD_STATE_RESET)
> scsi_unblock_requests(hba->host);
>
> hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
> -
> + scsi_scan_host(hba->host);
> out:
> return err;
> }
> @@ -936,28 +853,34 @@ static int ufshcd_hba_enable(struct ufs_hba *hba)
> }
>
> /**
> - * ufshcd_link_startup - Initialize unipro link startup
> + * ufshcd_initialize_hba - start the initialization process
> * @hba: per adapter instance
> *
> - * Returns 0 for success, non-zero in case of failure
> + * 1. Enable the controller via ufshcd_hba_enable.
> + * 2. Program the Transfer Request List Address with the starting address of
> + * UTRDL.
> + * 3. Program the Task Management Request List Address with starting address
> + * of UTMRDL.
> + *
> + * Returns 0 on success, non-zero value on failure.
> */
> -static int ufshcd_link_startup(struct ufs_hba *hba)
> +static int ufshcd_initialize_hba(struct ufs_hba *hba)
> {
> - int ret;
> -
> - /* enable UIC related interrupts */
> - ufshcd_enable_intr(hba, UIC_COMMAND_COMPL);
> -
> - ret = ufshcd_dme_link_startup(hba);
> - if (ret)
> - goto out;
> -
> - ret = ufshcd_make_hba_operational(hba);
> + if (ufshcd_hba_enable(hba))
> + return -EIO;
>
> -out:
> - if (ret)
> - dev_err(hba->dev, "link startup failed %d\n", ret);
> - return ret;
> + /* Configure UTRL and UTMRL base address registers */
> + writel(lower_32_bits(hba->utrdl_dma_addr),
> + (hba->mmio_base + REG_UTP_TRANSFER_REQ_LIST_BASE_L));
> + writel(upper_32_bits(hba->utrdl_dma_addr),
> + (hba->mmio_base + REG_UTP_TRANSFER_REQ_LIST_BASE_H));
> + writel(lower_32_bits(hba->utmrdl_dma_addr),
> + (hba->mmio_base + REG_UTP_TASK_REQ_LIST_BASE_L));
> + writel(upper_32_bits(hba->utmrdl_dma_addr),
> + (hba->mmio_base + REG_UTP_TASK_REQ_LIST_BASE_H));
> +
> + /* Initialize unipro link startup procedure */
> + return ufshcd_dme_link_startup(hba);
> }
>
> /**
> @@ -997,19 +920,12 @@ static int ufshcd_do_reset(struct ufs_hba *hba)
> hba->outstanding_reqs = 0;
> hba->outstanding_tasks = 0;
>
> - /* Host controller enable */
> - if (ufshcd_hba_enable(hba)) {
> + /* start the initialization process */
> + if (ufshcd_initialize_hba(hba)) {
> dev_err(hba->dev,
> "Reset: Controller initialization failed\n");
> return FAILED;
> }
> -
> - if (ufshcd_link_startup(hba)) {
> - dev_err(hba->dev,
> - "Reset: Link start-up failed\n");
> - return FAILED;
> - }
> -
> return SUCCESS;
> }
>
> @@ -1241,19 +1157,6 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
> }
>
> /**
> - * ufshcd_uic_cmd_compl - handle completion of uic command
> - * @hba: per adapter instance
> - */
> -static void ufshcd_uic_cmd_compl(struct ufs_hba *hba)
> -{
> - if (hba->active_uic_cmd) {
> - hba->active_uic_cmd->argument2 |=
> - ufshcd_get_uic_cmd_result(hba);
> - complete(&hba->active_uic_cmd->done);
> - }
> -}
> -
> -/**
> * ufshcd_transfer_req_compl - handle SCSI and query command completion
> * @hba: per adapter instance
> */
> @@ -1266,7 +1169,8 @@ static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
> int index;
>
> lrb = hba->lrb;
> - tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
> + tr_doorbell =
> + readl(hba->mmio_base + REG_UTP_TRANSFER_REQ_DOOR_BELL);
> completed_reqs = tr_doorbell ^ hba->outstanding_reqs;
>
> for (index = 0; index < hba->nutrs; index++) {
> @@ -1293,6 +1197,28 @@ static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
> }
>
> /**
> + * ufshcd_uic_cc_handler - handle UIC command completion
> + * @work: pointer to a work queue structure
> + *
> + * Returns 0 on success, non-zero value on failure
> + */
> +static void ufshcd_uic_cc_handler (struct work_struct *work)
> +{
> + struct ufs_hba *hba;
> +
> + hba = container_of(work, struct ufs_hba, uic_workq);
> +
> + if ((hba->active_uic_cmd.command == UIC_CMD_DME_LINK_STARTUP) &&
> + !(ufshcd_get_uic_cmd_result(hba))) {
> +
> + if (ufshcd_make_hba_operational(hba))
> + dev_err(hba->dev,
> + "cc: hba not operational state\n");
> + return;
> + }
> +}
> +
> +/**
> * ufshcd_fatal_err_handler - handle fatal errors
> * @hba: per adapter instance
> */
> @@ -1318,7 +1244,9 @@ static void ufshcd_err_handler(struct ufs_hba *hba)
> goto fatal_eh;
>
> if (hba->errors & UIC_ERROR) {
> - reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DATA_LINK_LAYER);
> +
> + reg = readl(hba->mmio_base +
> + REG_UIC_ERROR_CODE_PHY_ADAPTER_LAYER);
> if (reg & UIC_DATA_LINK_LAYER_ERROR_PA_INIT)
> goto fatal_eh;
> }
> @@ -1336,7 +1264,7 @@ static void ufshcd_tmc_handler(struct ufs_hba *hba)
> {
> u32 tm_doorbell;
>
> - tm_doorbell = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL);
> + tm_doorbell = readl(hba->mmio_base + REG_UTP_TASK_REQ_DOOR_BELL);
> hba->tm_condition = tm_doorbell ^ hba->outstanding_tasks;
> wake_up_interruptible(&hba->ufshcd_tm_wait_queue);
> }
> @@ -1353,7 +1281,7 @@ static void ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status)
> ufshcd_err_handler(hba);
>
> if (intr_status & UIC_COMMAND_COMPL)
> - ufshcd_uic_cmd_compl(hba);
> + schedule_work(&hba->uic_workq);
>
> if (intr_status & UTP_TASK_REQ_COMPL)
> ufshcd_tmc_handler(hba);
> @@ -1377,11 +1305,15 @@ static irqreturn_t ufshcd_intr(int irq, void *__hba)
> struct ufs_hba *hba = __hba;
>
> spin_lock(hba->host->host_lock);
> - intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
> + intr_status = readl(hba->mmio_base + REG_INTERRUPT_STATUS);
>
> if (intr_status) {
> - ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS);
> ufshcd_sl_intr(hba, intr_status);
> +
> + /* If UFSHCI 1.0 then clear interrupt status register */
> + if (hba->ufs_version == UFSHCI_VERSION_10)
> + writel(intr_status,
> + (hba->mmio_base + REG_INTERRUPT_STATUS));
> retval = IRQ_HANDLED;
> }
> spin_unlock(hba->host->host_lock);
> @@ -1446,7 +1378,8 @@ ufshcd_issue_tm_cmd(struct ufs_hba *hba,
>
> /* send command to the controller */
> __set_bit(free_slot, &hba->outstanding_tasks);
> - ufshcd_writel(hba, 1 << free_slot, REG_UTP_TASK_REQ_DOOR_BELL);
> + writel((1 << free_slot),
> + (hba->mmio_base + REG_UTP_TASK_REQ_DOOR_BELL));
>
> spin_unlock_irqrestore(host->host_lock, flags);
>
> @@ -1576,21 +1509,6 @@ out:
> return err;
> }
>
> -/**
> - * ufshcd_async_scan - asynchronous execution for link startup
> - * @data: data pointer to pass to this function
> - * @cookie: cookie data
> - */
> -static void ufshcd_async_scan(void *data, async_cookie_t cookie)
> -{
> - struct ufs_hba *hba = (struct ufs_hba *)data;
> - int ret;
> -
> - ret = ufshcd_link_startup(hba);
> - if (!ret)
> - scsi_scan_host(hba->host);
> -}
> -
> static struct scsi_host_template ufshcd_driver_template = {
> .module = THIS_MODULE,
> .name = UFSHCD,
> @@ -1651,6 +1569,17 @@ int ufshcd_resume(struct ufs_hba *hba)
> EXPORT_SYMBOL_GPL(ufshcd_resume);
>
> /**
> + * ufshcd_hba_free - free allocated memory for
> + * host memory space data structures
> + * @hba: per adapter instance
> + */
> +static void ufshcd_hba_free(struct ufs_hba *hba)
> +{
> + iounmap(hba->mmio_base);
> + ufshcd_free_hba_memory(hba);
> +}
> +
> +/**
> * ufshcd_remove - de-allocate SCSI host and host memory space
> * data structure memory
> * @hba - per adapter instance
> @@ -1658,8 +1587,10 @@ EXPORT_SYMBOL_GPL(ufshcd_resume);
> void ufshcd_remove(struct ufs_hba *hba)
> {
> /* disable interrupts */
> - ufshcd_disable_intr(hba, hba->intr_mask);
> + ufshcd_int_config(hba, UFSHCD_INT_DISABLE);
> +
> ufshcd_hba_stop(hba);
> + ufshcd_hba_free(hba);
>
> scsi_remove_host(hba->host);
> scsi_host_put(hba->host);
> @@ -1714,9 +1645,6 @@ int ufshcd_init(struct device *dev, struct ufs_hba **hba_handle,
> /* Get UFS version supported by the controller */
> hba->ufs_version = ufshcd_get_ufs_version(hba);
>
> - /* Get Interrupt bit mask per version */
> - hba->intr_mask = ufshcd_get_intr_mask(hba);
> -
> /* Allocate memory for host memory space */
> err = ufshcd_memory_alloc(hba);
> if (err) {
> @@ -1739,46 +1667,45 @@ int ufshcd_init(struct device *dev, struct ufs_hba **hba_handle,
> init_waitqueue_head(&hba->ufshcd_tm_wait_queue);
>
> /* Initialize work queues */
> + INIT_WORK(&hba->uic_workq, ufshcd_uic_cc_handler);
> INIT_WORK(&hba->feh_workq, ufshcd_fatal_err_handler);
>
> - /* Initialize UIC command mutex */
> - mutex_init(&hba->uic_cmd_mutex);
> -
> /* IRQ registration */
> - err = devm_request_irq(dev, irq, ufshcd_intr, IRQF_SHARED, UFSHCD, hba);
> + err = request_irq(irq, ufshcd_intr, IRQF_SHARED, UFSHCD, hba);
> if (err) {
> dev_err(hba->dev, "request irq failed\n");
> - goto out_disable;
> + goto out_lrb_free;
> }
>
> /* Enable SCSI tag mapping */
> err = scsi_init_shared_tag_map(host, host->can_queue);
> if (err) {
> dev_err(hba->dev, "init shared queue failed\n");
> - goto out_disable;
> + goto out_free_irq;
> }
>
> err = scsi_add_host(host, hba->dev);
> if (err) {
> dev_err(hba->dev, "scsi_add_host failed\n");
> - goto out_disable;
> + goto out_free_irq;
> }
>
> - /* Host controller enable */
> - err = ufshcd_hba_enable(hba);
> + /* Initialization routine */
> + err = ufshcd_initialize_hba(hba);
> if (err) {
> - dev_err(hba->dev, "Host controller enable failed\n");
> + dev_err(hba->dev, "Initialization failed\n");
> goto out_remove_scsi_host;
> }
> -
> *hba_handle = hba;
>
> - async_schedule(ufshcd_async_scan, hba);
> -
> return 0;
>
> out_remove_scsi_host:
> scsi_remove_host(hba->host);
> +out_free_irq:
> + free_irq(irq, hba);
> +out_lrb_free:
> + ufshcd_free_hba_memory(hba);
> out_disable:
> scsi_host_put(host);
> out_error:
> --
> 1.7.6
>
> --
> QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundatio
> --
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
You will have to re-submit without the ufshcd changes :-)
--
~Santosh
--
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