@@ -168,6 +168,11 @@ struct mmc_rpmb_data {
static inline int mmc_blk_part_switch(struct mmc_card *card,
unsigned int part_type);
+static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
+ struct mmc_card *card,
+ int disable_multi,
+ struct mmc_queue *mq);
+static void mmc_blk_hsq_req_done(struct mmc_request *mrq);
static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
{
@@ -1532,9 +1537,30 @@ static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req)
return mmc_blk_cqe_start_req(mq->card->host, mrq);
}
+static int mmc_blk_hsq_issue_rw_rq(struct mmc_queue *mq, struct request *req)
+{
+ struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
+ struct mmc_host *host = mq->card->host;
+ int err;
+
+ mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
+ mqrq->brq.mrq.done = mmc_blk_hsq_req_done;
+ mmc_pre_req(host, &mqrq->brq.mrq);
+
+ err = mmc_cqe_start_req(host, &mqrq->brq.mrq);
+ if (err)
+ mmc_post_req(host, &mqrq->brq.mrq, err);
+
+ return err;
+}
+
static int mmc_blk_cqe_issue_rw_rq(struct mmc_queue *mq, struct request *req)
{
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
+ struct mmc_host *host = mq->card->host;
+
+ if (host->hsq_enabled)
+ return mmc_blk_hsq_issue_rw_rq(mq, req);
mmc_blk_data_prep(mq, mqrq, 0, NULL, NULL);
@@ -1920,6 +1946,41 @@ static void mmc_blk_urgent_bkops(struct mmc_queue *mq,
mmc_run_bkops(mq->card);
}
+static void mmc_blk_hsq_req_done(struct mmc_request *mrq)
+{
+ struct mmc_queue_req *mqrq =
+ container_of(mrq, struct mmc_queue_req, brq.mrq);
+ struct request *req = mmc_queue_req_to_req(mqrq);
+ struct request_queue *q = req->q;
+ struct mmc_queue *mq = q->queuedata;
+ struct mmc_host *host = mq->card->host;
+ unsigned long flags;
+
+ if (mmc_blk_rq_error(&mqrq->brq) ||
+ mmc_blk_urgent_bkops_needed(mq, mqrq)) {
+ spin_lock_irqsave(&mq->lock, flags);
+ mq->recovery_needed = true;
+ mq->recovery_req = req;
+ spin_unlock_irqrestore(&mq->lock, flags);
+
+ host->cqe_ops->cqe_recovery_start(host);
+
+ schedule_work(&mq->recovery_work);
+ return;
+ }
+
+ mmc_blk_rw_reset_success(mq, req);
+
+ /*
+ * Block layer timeouts race with completions which means the normal
+ * completion path cannot be used during recovery.
+ */
+ if (mq->in_recovery)
+ mmc_blk_cqe_complete_rq(mq, req);
+ else
+ blk_mq_complete_request(req);
+}
+
void mmc_blk_mq_complete(struct request *req)
{
struct mmc_queue *mq = req->q->queuedata;
@@ -1851,15 +1851,19 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
*/
card->reenable_cmdq = card->ext_csd.cmdq_en;
- if (card->ext_csd.cmdq_en && !host->cqe_enabled) {
+ if (host->cqe_ops && !host->cqe_enabled) {
err = host->cqe_ops->cqe_enable(host, card);
- if (err) {
- pr_err("%s: Failed to enable CQE, error %d\n",
- mmc_hostname(host), err);
- } else {
+ if (!err) {
host->cqe_enabled = true;
- pr_info("%s: Command Queue Engine enabled\n",
- mmc_hostname(host));
+
+ if (card->ext_csd.cmdq_en) {
+ pr_info("%s: Command Queue Engine enabled\n",
+ mmc_hostname(host));
+ } else {
+ host->hsq_enabled = true;
+ pr_info("%s: Host Software Queue enabled\n",
+ mmc_hostname(host));
+ }
}
}
@@ -62,7 +62,7 @@ enum mmc_issue_type mmc_issue_type(struct mmc_queue *mq, struct request *req)
{
struct mmc_host *host = mq->card->host;
- if (mq->use_cqe)
+ if (mq->use_cqe && !host->hsq_enabled)
return mmc_cqe_issue_type(host, req);
if (req_op(req) == REQ_OP_READ || req_op(req) == REQ_OP_WRITE)
@@ -124,12 +124,14 @@ static enum blk_eh_timer_return mmc_mq_timed_out(struct request *req,
{
struct request_queue *q = req->q;
struct mmc_queue *mq = q->queuedata;
+ struct mmc_card *card = mq->card;
+ struct mmc_host *host = card->host;
unsigned long flags;
int ret;
spin_lock_irqsave(&mq->lock, flags);
- if (mq->recovery_needed || !mq->use_cqe)
+ if (mq->recovery_needed || !mq->use_cqe || host->hsq_enabled)
ret = BLK_EH_RESET_TIMER;
else
ret = mmc_cqe_timed_out(req);
@@ -144,12 +146,13 @@ static void mmc_mq_recovery_handler(struct work_struct *work)
struct mmc_queue *mq = container_of(work, struct mmc_queue,
recovery_work);
struct request_queue *q = mq->queue;
+ struct mmc_host *host = mq->card->host;
mmc_get_card(mq->card, &mq->ctx);
mq->in_recovery = true;
- if (mq->use_cqe)
+ if (mq->use_cqe && !host->hsq_enabled)
mmc_blk_cqe_recovery(mq);
else
mmc_blk_mq_recovery(mq);
@@ -160,6 +163,9 @@ static void mmc_mq_recovery_handler(struct work_struct *work)
mq->recovery_needed = false;
spin_unlock_irq(&mq->lock);
+ if (host->hsq_enabled)
+ host->cqe_ops->cqe_recovery_finish(host);
+
mmc_put_card(mq->card, &mq->ctx);
blk_mq_run_hw_queues(q, true);
@@ -279,6 +285,14 @@ static blk_status_t mmc_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
}
break;
case MMC_ISSUE_ASYNC:
+ /*
+ * For MMC host software queue, we only allow 2 requests in
+ * flight to avoid a long latency.
+ */
+ if (host->hsq_enabled && mq->in_flight[issue_type] > 2) {
+ spin_unlock_irq(&mq->lock);
+ return BLK_STS_RESOURCE;
+ }
break;
default:
/*
@@ -430,7 +444,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card)
* The queue depth for CQE must match the hardware because the request
* tag is used to index the hardware queue.
*/
- if (mq->use_cqe)
+ if (mq->use_cqe && !host->hsq_enabled)
mq->tag_set.queue_depth =
min_t(int, card->ext_csd.cmdq_depth, host->cqe_qdepth);
else
@@ -949,6 +949,13 @@ config MMC_CQHCI
If unsure, say N.
+config MMC_HSQ
+ tristate "MMC Host Software Queue support"
+ help
+ This selects the Software Queue support.
+
+ If unsure, say N.
+
config MMC_TOSHIBA_PCI
tristate "Toshiba Type A SD/MMC Card Interface Driver"
depends on PCI
@@ -100,6 +100,7 @@ obj-$(CONFIG_MMC_SDHCI_BRCMSTB) += sdhci-brcmstb.o
obj-$(CONFIG_MMC_SDHCI_OMAP) += sdhci-omap.o
obj-$(CONFIG_MMC_SDHCI_SPRD) += sdhci-sprd.o
obj-$(CONFIG_MMC_CQHCI) += cqhci.o
+obj-$(CONFIG_MMC_HSQ) += mmc_hsq.o
ifeq ($(CONFIG_CB710_DEBUG),y)
CFLAGS-cb710-mmc += -DDEBUG
@@ -321,14 +321,20 @@ static int cqhci_enable(struct mmc_host *mmc, struct mmc_card *card)
struct cqhci_host *cq_host = mmc->cqe_private;
int err;
+ if (!card->ext_csd.cmdq_en)
+ return -EINVAL;
+
if (cq_host->enabled)
return 0;
cq_host->rca = card->rca;
err = cqhci_host_alloc_tdl(cq_host);
- if (err)
+ if (err) {
+ pr_err("%s: Failed to enable CQE, error %d\n",
+ mmc_hostname(mmc), err);
return err;
+ }
__cqhci_enable(cq_host);
new file mode 100644
@@ -0,0 +1,343 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MMC software queue support based on command queue interfaces
+ *
+ * Copyright (C) 2019 Linaro, Inc.
+ * Author: Baolin Wang <baolin.wang@linaro.org>
+ */
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+
+#include "mmc_hsq.h"
+
+#define HSQ_NUM_SLOTS 64
+#define HSQ_INVALID_TAG HSQ_NUM_SLOTS
+
+static void mmc_hsq_pump_requests(struct mmc_hsq *hsq)
+{
+ struct mmc_host *mmc = hsq->mmc;
+ struct hsq_slot *slot;
+ unsigned long flags;
+
+ spin_lock_irqsave(&hsq->lock, flags);
+
+ /* Make sure we are not already running a request now */
+ if (hsq->mrq) {
+ spin_unlock_irqrestore(&hsq->lock, flags);
+ return;
+ }
+
+ /* Make sure there are remain requests need to pump */
+ if (!hsq->qcnt || !hsq->enabled) {
+ spin_unlock_irqrestore(&hsq->lock, flags);
+ return;
+ }
+
+ slot = &hsq->slot[hsq->next_tag];
+ hsq->mrq = slot->mrq;
+ hsq->qcnt--;
+
+ spin_unlock_irqrestore(&hsq->lock, flags);
+
+ mmc->ops->request(mmc, hsq->mrq);
+}
+
+static void mmc_hsq_update_next_tag(struct mmc_hsq *hsq, int remains)
+{
+ struct hsq_slot *slot;
+ int tag;
+
+ /*
+ * If there are no remain requests in software queue, then set a invalid
+ * tag.
+ */
+ if (!remains) {
+ hsq->next_tag = HSQ_INVALID_TAG;
+ return;
+ }
+
+ /*
+ * Increasing the next tag and check if the corresponding request is
+ * available, if yes, then we found a candidate request.
+ */
+ if (++hsq->next_tag != HSQ_INVALID_TAG) {
+ slot = &hsq->slot[hsq->next_tag];
+ if (slot->mrq)
+ return;
+ }
+
+ /* Othersie we should iterate all slots to find a available tag. */
+ for (tag = 0; tag < HSQ_NUM_SLOTS; tag++) {
+ slot = &hsq->slot[tag];
+ if (slot->mrq)
+ break;
+ }
+
+ if (tag == HSQ_NUM_SLOTS)
+ tag = HSQ_INVALID_TAG;
+
+ hsq->next_tag = tag;
+}
+
+static void mmc_hsq_post_request(struct mmc_hsq *hsq)
+{
+ unsigned long flags;
+ int remains;
+
+ spin_lock_irqsave(&hsq->lock, flags);
+
+ remains = hsq->qcnt;
+ hsq->mrq = NULL;
+
+ /* Update the next available tag to be queued. */
+ mmc_hsq_update_next_tag(hsq, remains);
+
+ if (hsq->waiting_for_idle && !remains) {
+ hsq->waiting_for_idle = false;
+ wake_up(&hsq->wait_queue);
+ }
+
+ /* Do not pump new request in recovery mode. */
+ if (hsq->recovery_halt) {
+ spin_unlock_irqrestore(&hsq->lock, flags);
+ return;
+ }
+
+ spin_unlock_irqrestore(&hsq->lock, flags);
+
+ /*
+ * Try to pump new request to host controller as fast as possible,
+ * after completing previous request.
+ */
+ if (remains > 0)
+ mmc_hsq_pump_requests(hsq);
+}
+
+/**
+ * mmc_hsq_finalize_request - finalize one request if the request is done
+ * @mmc: the host controller
+ * @mrq: the request need to be finalized
+ *
+ * Return true if we finalized the corresponding request in software queue,
+ * otherwise return false.
+ */
+bool mmc_hsq_finalize_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct mmc_hsq *hsq = mmc->cqe_private;
+ unsigned long flags;
+
+ spin_lock_irqsave(&hsq->lock, flags);
+
+ if (!hsq->enabled || !hsq->mrq || hsq->mrq != mrq) {
+ spin_unlock_irqrestore(&hsq->lock, flags);
+ return false;
+ }
+
+ /*
+ * Clear current completed slot request to make a room for new request.
+ */
+ hsq->slot[hsq->next_tag].mrq = NULL;
+
+ spin_unlock_irqrestore(&hsq->lock, flags);
+
+ mmc_cqe_request_done(mmc, hsq->mrq);
+
+ mmc_hsq_post_request(hsq);
+
+ return true;
+}
+EXPORT_SYMBOL_GPL(mmc_hsq_finalize_request);
+
+static void mmc_hsq_recovery_start(struct mmc_host *mmc)
+{
+ struct mmc_hsq *hsq = mmc->cqe_private;
+ unsigned long flags;
+
+ spin_lock_irqsave(&hsq->lock, flags);
+
+ hsq->recovery_halt = true;
+
+ spin_unlock_irqrestore(&hsq->lock, flags);
+}
+
+static void mmc_hsq_recovery_finish(struct mmc_host *mmc)
+{
+ struct mmc_hsq *hsq = mmc->cqe_private;
+ int remains;
+
+ spin_lock_irq(&hsq->lock);
+
+ hsq->recovery_halt = false;
+ remains = hsq->qcnt;
+
+ spin_unlock_irq(&hsq->lock);
+
+ /*
+ * Try to pump new request if there are request pending in software
+ * queue after finishing recovery.
+ */
+ if (remains > 0)
+ mmc_hsq_pump_requests(hsq);
+}
+
+static int mmc_hsq_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct mmc_hsq *hsq = mmc->cqe_private;
+ int tag = mrq->tag;
+
+ spin_lock_irq(&hsq->lock);
+
+ if (!hsq->enabled) {
+ spin_unlock_irq(&hsq->lock);
+ return -ESHUTDOWN;
+ }
+
+ /* Do not queue any new requests in recovery mode. */
+ if (hsq->recovery_halt) {
+ spin_unlock_irq(&hsq->lock);
+ return -EBUSY;
+ }
+
+ hsq->slot[tag].mrq = mrq;
+
+ /*
+ * Set the next tag as current request tag if no available
+ * next tag.
+ */
+ if (hsq->next_tag == HSQ_INVALID_TAG)
+ hsq->next_tag = tag;
+
+ hsq->qcnt++;
+
+ spin_unlock_irq(&hsq->lock);
+
+ mmc_hsq_pump_requests(hsq);
+
+ return 0;
+}
+
+static void mmc_hsq_post_req(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ if (mmc->ops->post_req)
+ mmc->ops->post_req(mmc, mrq, 0);
+}
+
+static bool mmc_hsq_queue_is_idle(struct mmc_hsq *hsq, int *ret)
+{
+ bool is_idle;
+
+ spin_lock_irq(&hsq->lock);
+
+ is_idle = (!hsq->mrq && !hsq->qcnt) ||
+ hsq->recovery_halt;
+
+ *ret = hsq->recovery_halt ? -EBUSY : 0;
+ hsq->waiting_for_idle = !is_idle;
+
+ spin_unlock_irq(&hsq->lock);
+
+ return is_idle;
+}
+
+static int mmc_hsq_wait_for_idle(struct mmc_host *mmc)
+{
+ struct mmc_hsq *hsq = mmc->cqe_private;
+ int ret;
+
+ wait_event(hsq->wait_queue,
+ mmc_hsq_queue_is_idle(hsq, &ret));
+
+ return ret;
+}
+
+static void mmc_hsq_disable(struct mmc_host *mmc)
+{
+ struct mmc_hsq *hsq = mmc->cqe_private;
+ u32 timeout = 500;
+ int ret;
+
+ spin_lock_irq(&hsq->lock);
+
+ if (!hsq->enabled) {
+ spin_unlock_irq(&hsq->lock);
+ return;
+ }
+
+ spin_unlock_irq(&hsq->lock);
+
+ ret = wait_event_timeout(hsq->wait_queue,
+ mmc_hsq_queue_is_idle(hsq, &ret),
+ msecs_to_jiffies(timeout));
+ if (ret == 0) {
+ pr_warn("could not stop mmc software queue\n");
+ return;
+ }
+
+ spin_lock_irq(&hsq->lock);
+
+ hsq->enabled = false;
+
+ spin_unlock_irq(&hsq->lock);
+}
+
+static int mmc_hsq_enable(struct mmc_host *mmc, struct mmc_card *card)
+{
+ struct mmc_hsq *hsq = mmc->cqe_private;
+
+ spin_lock_irq(&hsq->lock);
+
+ if (hsq->enabled) {
+ spin_unlock_irq(&hsq->lock);
+ return -EBUSY;
+ }
+
+ hsq->enabled = true;
+
+ spin_unlock_irq(&hsq->lock);
+
+ return 0;
+}
+
+static const struct mmc_cqe_ops mmc_hsq_ops = {
+ .cqe_enable = mmc_hsq_enable,
+ .cqe_disable = mmc_hsq_disable,
+ .cqe_request = mmc_hsq_request,
+ .cqe_post_req = mmc_hsq_post_req,
+ .cqe_wait_for_idle = mmc_hsq_wait_for_idle,
+ .cqe_recovery_start = mmc_hsq_recovery_start,
+ .cqe_recovery_finish = mmc_hsq_recovery_finish,
+};
+
+int mmc_hsq_init(struct mmc_hsq *hsq, struct mmc_host *mmc)
+{
+ hsq->num_slots = HSQ_NUM_SLOTS;
+ hsq->next_tag = HSQ_INVALID_TAG;
+
+ hsq->slot = devm_kcalloc(mmc_dev(mmc), hsq->num_slots,
+ sizeof(struct hsq_slot), GFP_KERNEL);
+ if (!hsq->slot)
+ return -ENOMEM;
+
+ hsq->mmc = mmc;
+ hsq->mmc->cqe_private = hsq;
+ mmc->cqe_ops = &mmc_hsq_ops;
+
+ spin_lock_init(&hsq->lock);
+ init_waitqueue_head(&hsq->wait_queue);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mmc_hsq_init);
+
+void mmc_hsq_suspend(struct mmc_host *mmc)
+{
+ mmc_hsq_disable(mmc);
+}
+EXPORT_SYMBOL_GPL(mmc_hsq_suspend);
+
+int mmc_hsq_resume(struct mmc_host *mmc)
+{
+ return mmc_hsq_enable(mmc, NULL);
+}
+EXPORT_SYMBOL_GPL(mmc_hsq_resume);
new file mode 100644
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef LINUX_MMC_HSQ_H
+#define LINUX_MMC_HSQ_H
+
+struct hsq_slot {
+ struct mmc_request *mrq;
+};
+
+struct mmc_hsq {
+ struct mmc_host *mmc;
+ struct mmc_request *mrq;
+ wait_queue_head_t wait_queue;
+ struct hsq_slot *slot;
+ spinlock_t lock;
+
+ int next_tag;
+ int num_slots;
+ int qcnt;
+
+ bool enabled;
+ bool waiting_for_idle;
+ bool recovery_halt;
+};
+
+int mmc_hsq_init(struct mmc_hsq *hsq, struct mmc_host *mmc);
+void mmc_hsq_suspend(struct mmc_host *mmc);
+int mmc_hsq_resume(struct mmc_host *mmc);
+bool mmc_hsq_finalize_request(struct mmc_host *mmc, struct mmc_request *mrq);
+
+#endif
@@ -462,6 +462,9 @@ struct mmc_host {
bool cqe_enabled;
bool cqe_on;
+ /* Host Software Queue support */
+ bool hsq_enabled;
+
unsigned long private[0] ____cacheline_aligned;
};