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Subject[PATCH v2 1/3] mmc: block: Add MMC write packing statistics
Date
The write packing statistics are used for the packed commands unit tests
in order to determine test success or failure

Signed-off-by: Maya Erez <merez@codeaurora.org>

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 260203a..10b77fd 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -63,6 +63,11 @@ MODULE_ALIAS("mmc:block");
(rq_data_dir(req) == WRITE))
#define PACKED_CMD_VER 0x01
#define PACKED_CMD_WR 0x02
+#define MMC_BLK_UPDATE_STOP_REASON(stats, reason) \
+ do { \
+ if (stats->enabled) \
+ stats->pack_stop_reason[reason]++; \
+ } while (0)

static DEFINE_MUTEX(block_mutex);

@@ -1296,6 +1301,35 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
mmc_queue_bounce_pre(mqrq);
}

+struct mmc_wr_pack_stats *mmc_blk_get_packed_statistics(struct mmc_card *card)
+{
+ if (!card)
+ return NULL;
+
+ return &card->wr_pack_stats;
+}
+EXPORT_SYMBOL(mmc_blk_get_packed_statistics);
+
+void mmc_blk_init_packed_statistics(struct mmc_card *card)
+{
+ int max_num_of_packed_reqs = 0;
+
+ if (!card || !card->wr_pack_stats.packing_events)
+ return;
+
+ max_num_of_packed_reqs = card->ext_csd.max_packed_writes;
+
+ spin_lock(&card->wr_pack_stats.lock);
+ memset(card->wr_pack_stats.packing_events, 0,
+ (max_num_of_packed_reqs + 1) *
+ sizeof(*card->wr_pack_stats.packing_events));
+ memset(&card->wr_pack_stats.pack_stop_reason, 0,
+ sizeof(card->wr_pack_stats.pack_stop_reason));
+ card->wr_pack_stats.enabled = true;
+ spin_unlock(&card->wr_pack_stats.lock);
+}
+EXPORT_SYMBOL(mmc_blk_init_packed_statistics);
+
static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
{
struct request_queue *q = mq->queue;
@@ -1308,6 +1342,7 @@ static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
u8 put_back = 0;
u8 max_packed_rw = 0;
u8 reqs = 0;
+ struct mmc_wr_pack_stats *stats = &card->wr_pack_stats;

mmc_blk_clear_packed(mq->mqrq_cur);

@@ -1342,20 +1377,26 @@ static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
phys_segments++;
}

+ spin_lock(&stats->lock);
+
while (reqs < max_packed_rw - 1) {
spin_lock_irq(q->queue_lock);
next = blk_fetch_request(q);
spin_unlock_irq(q->queue_lock);
- if (!next)
+ if (!next) {
+ MMC_BLK_UPDATE_STOP_REASON(stats, EMPTY_QUEUE);
break;
+ }

if (next->cmd_flags & REQ_DISCARD ||
next->cmd_flags & REQ_FLUSH) {
+ MMC_BLK_UPDATE_STOP_REASON(stats, FLUSH_OR_DISCARD);
put_back = 1;
break;
}

if (rq_data_dir(cur) != rq_data_dir(next)) {
+ MMC_BLK_UPDATE_STOP_REASON(stats, WRONG_DATA_DIR);
put_back = 1;
break;
}
@@ -1363,18 +1404,22 @@ static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
if (mmc_req_rel_wr(next) &&
(md->flags & MMC_BLK_REL_WR) &&
!en_rel_wr) {
+ MMC_BLK_UPDATE_STOP_REASON(stats, REL_WRITE);
put_back = 1;
break;
}

req_sectors += blk_rq_sectors(next);
if (req_sectors > max_blk_count) {
+ if (stats->enabled)
+ stats->pack_stop_reason[EXCEEDS_SECTORS]++;
put_back = 1;
break;
}

phys_segments += next->nr_phys_segments;
if (phys_segments > max_phys_segs) {
+ MMC_BLK_UPDATE_STOP_REASON(stats, EXCEEDS_SEGMENTS);
put_back = 1;
break;
}
@@ -1390,6 +1435,15 @@ static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
spin_unlock_irq(q->queue_lock);
}

+ if (stats->enabled) {
+ if (reqs + 1 <= card->ext_csd.max_packed_writes)
+ stats->packing_events[reqs + 1]++;
+ if (reqs + 1 == max_packed_rw)
+ MMC_BLK_UPDATE_STOP_REASON(stats, THRESHOLD);
+ }
+
+ spin_unlock(&stats->lock);
+
if (reqs > 0) {
list_add(&req->queuelist, &mq->mqrq_cur->packed_list);
mq->mqrq_cur->packed_num = ++reqs;
diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index 9b68933..e3b0e74 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -251,6 +251,8 @@ struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
card->dev.release = mmc_release_card;
card->dev.type = type;

+ spin_lock_init(&card->wr_pack_stats.lock);
+
return card;
}

@@ -353,6 +355,8 @@ void mmc_remove_card(struct mmc_card *card)
device_del(&card->dev);
}

+ kfree(card->wr_pack_stats.packing_events);
+
put_device(&card->dev);
}

diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
index 9ab5b17..7fb45f3 100644
--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -318,6 +318,169 @@ static const struct file_operations mmc_dbg_ext_csd_fops = {
.llseek = default_llseek,
};

+static int mmc_wr_pack_stats_open(struct inode *inode, struct file *filp)
+{
+ struct mmc_card *card = inode->i_private;
+
+ filp->private_data = card;
+ card->wr_pack_stats.print_in_read = 1;
+ return 0;
+}
+
+#define TEMP_BUF_SIZE 256
+static ssize_t mmc_wr_pack_stats_read(struct file *filp, char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ struct mmc_card *card = filp->private_data;
+ struct mmc_wr_pack_stats *pack_stats;
+ int i;
+ int max_num_of_packed_reqs = 0;
+ char *temp_buf;
+
+ if (!card)
+ return cnt;
+
+ if (!card->wr_pack_stats.print_in_read)
+ return 0;
+
+ if (!card->wr_pack_stats.enabled) {
+ pr_info("%s: write packing statistics are disabled\n",
+ mmc_hostname(card->host));
+ goto exit;
+ }
+
+ pack_stats = &card->wr_pack_stats;
+
+ if (!pack_stats->packing_events) {
+ pr_info("%s: NULL packing_events\n", mmc_hostname(card->host));
+ goto exit;
+ }
+
+ max_num_of_packed_reqs = card->ext_csd.max_packed_writes;
+
+ temp_buf = kmalloc(TEMP_BUF_SIZE, GFP_KERNEL);
+ if (!temp_buf)
+ goto exit;
+
+ spin_lock(&pack_stats->lock);
+
+ snprintf(temp_buf, TEMP_BUF_SIZE, "%s: write packing statistics:\n",
+ mmc_hostname(card->host));
+ strlcat(ubuf, temp_buf, cnt);
+
+ /*
+ * The statistics are kept in the index that equals the number of
+ * packed requests. Therefore we need to print the values in indexes
+ * 1 to max_num_of_packed_reqs.
+ */
+ for (i = 1 ; i <= max_num_of_packed_reqs ; ++i) {
+ if (pack_stats->packing_events[i]) {
+ snprintf(temp_buf, TEMP_BUF_SIZE,
+ "%s: Packed %d reqs - %d times\n",
+ mmc_hostname(card->host), i,
+ pack_stats->packing_events[i]);
+ strlcat(ubuf, temp_buf, cnt);
+ }
+ }
+
+ snprintf(temp_buf, TEMP_BUF_SIZE,
+ "%s: stopped packing due to the following reasons:\n",
+ mmc_hostname(card->host));
+ strlcat(ubuf, temp_buf, cnt);
+
+ if (pack_stats->pack_stop_reason[EXCEEDS_SEGMENTS]) {
+ snprintf(temp_buf, TEMP_BUF_SIZE,
+ "%s: %d times: exceed max num of segments\n",
+ mmc_hostname(card->host),
+ pack_stats->pack_stop_reason[EXCEEDS_SEGMENTS]);
+ strlcat(ubuf, temp_buf, cnt);
+ }
+ if (pack_stats->pack_stop_reason[EXCEEDS_SECTORS]) {
+ snprintf(temp_buf, TEMP_BUF_SIZE,
+ "%s: %d times: exceed max num of sectors\n",
+ mmc_hostname(card->host),
+ pack_stats->pack_stop_reason[EXCEEDS_SECTORS]);
+ strlcat(ubuf, temp_buf, cnt);
+ }
+ if (pack_stats->pack_stop_reason[WRONG_DATA_DIR]) {
+ snprintf(temp_buf, TEMP_BUF_SIZE,
+ "%s: %d times: wrong data direction\n",
+ mmc_hostname(card->host),
+ pack_stats->pack_stop_reason[WRONG_DATA_DIR]);
+ strlcat(ubuf, temp_buf, cnt);
+ }
+ if (pack_stats->pack_stop_reason[FLUSH_OR_DISCARD]) {
+ snprintf(temp_buf, TEMP_BUF_SIZE,
+ "%s: %d times: flush or discard\n",
+ mmc_hostname(card->host),
+ pack_stats->pack_stop_reason[FLUSH_OR_DISCARD]);
+ strlcat(ubuf, temp_buf, cnt);
+ }
+ if (pack_stats->pack_stop_reason[EMPTY_QUEUE]) {
+ snprintf(temp_buf, TEMP_BUF_SIZE,
+ "%s: %d times: empty queue\n",
+ mmc_hostname(card->host),
+ pack_stats->pack_stop_reason[EMPTY_QUEUE]);
+ strlcat(ubuf, temp_buf, cnt);
+ }
+ if (pack_stats->pack_stop_reason[REL_WRITE]) {
+ snprintf(temp_buf, TEMP_BUF_SIZE,
+ "%s: %d times: rel write\n",
+ mmc_hostname(card->host),
+ pack_stats->pack_stop_reason[REL_WRITE]);
+ strlcat(ubuf, temp_buf, cnt);
+ }
+ if (pack_stats->pack_stop_reason[THRESHOLD]) {
+ snprintf(temp_buf, TEMP_BUF_SIZE,
+ "%s: %d times: Threshold\n",
+ mmc_hostname(card->host),
+ pack_stats->pack_stop_reason[THRESHOLD]);
+ strlcat(ubuf, temp_buf, cnt);
+ }
+
+ spin_unlock(&pack_stats->lock);
+
+ kfree(temp_buf);
+
+ pr_info("%s", ubuf);
+
+exit:
+ if (card->wr_pack_stats.print_in_read == 1) {
+ card->wr_pack_stats.print_in_read = 0;
+ return strnlen(ubuf, cnt);
+ }
+
+ return 0;
+}
+
+static ssize_t mmc_wr_pack_stats_write(struct file *filp,
+ const char __user *ubuf, size_t cnt,
+ loff_t *ppos)
+{
+ struct mmc_card *card = filp->private_data;
+ int value;
+
+ if (!card)
+ return cnt;
+
+ sscanf(ubuf, "%d", &value);
+ if (value) {
+ mmc_blk_init_packed_statistics(card);
+ } else {
+ spin_lock(&card->wr_pack_stats.lock);
+ card->wr_pack_stats.enabled = false;
+ spin_unlock(&card->wr_pack_stats.lock);
+ }
+
+ return cnt;
+}
+
+static const struct file_operations mmc_dbg_wr_pack_stats_fops = {
+ .open = mmc_wr_pack_stats_open,
+ .read = mmc_wr_pack_stats_read,
+ .write = mmc_wr_pack_stats_write,
+};
+
void mmc_add_card_debugfs(struct mmc_card *card)
{
struct mmc_host *host = card->host;
@@ -350,6 +513,12 @@ void mmc_add_card_debugfs(struct mmc_card *card)
&mmc_dbg_ext_csd_fops))
goto err;

+ if (mmc_card_mmc(card) && (card->ext_csd.rev >= 6) &&
+ (card->host->caps2 & MMC_CAP2_PACKED_WR))
+ if (!debugfs_create_file("wr_pack_stats", S_IRUSR, root, card,
+ &mmc_dbg_wr_pack_stats_fops))
+ goto err;
+
return;

err:
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index bfb271f..bc22360 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1269,6 +1269,24 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
} else {
card->ext_csd.packed_event_en = 1;
}
+
+ }
+
+ if (!oldcard) {
+ if ((host->caps2 & MMC_CAP2_PACKED_CMD) &&
+ (card->ext_csd.max_packed_writes > 0)) {
+ /*
+ * We would like to keep the statistics in an index
+ * that equals the num of packed requests
+ * (1 to max_packed_writes)
+ */
+ card->wr_pack_stats.packing_events = kzalloc(
+ (card->ext_csd.max_packed_writes + 1) *
+ sizeof(*card->wr_pack_stats.packing_events),
+ GFP_KERNEL);
+ if (!card->wr_pack_stats.packing_events)
+ goto free_card;
+ }
}

if (!oldcard)
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 4aeb4e9..d3ffef6 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -205,6 +205,25 @@ struct mmc_part {
#define MMC_BLK_DATA_AREA_GP (1<<2)
};

+enum mmc_packed_stop_reasons {
+ EXCEEDS_SEGMENTS = 0,
+ EXCEEDS_SECTORS,
+ WRONG_DATA_DIR,
+ FLUSH_OR_DISCARD,
+ EMPTY_QUEUE,
+ REL_WRITE,
+ THRESHOLD,
+ MAX_REASONS,
+};
+
+struct mmc_wr_pack_stats {
+ u32 *packing_events;
+ u32 pack_stop_reason[MAX_REASONS];
+ spinlock_t lock;
+ bool enabled;
+ bool print_in_read;
+};
+
/*
* MMC device
*/
@@ -277,6 +296,7 @@ struct mmc_card {
struct dentry *debugfs_root;
struct mmc_part part[MMC_NUM_PHY_PARTITION]; /* physical partitions */
unsigned int nr_parts;
+ struct mmc_wr_pack_stats wr_pack_stats; /* packed commands stats*/
};

/*
@@ -498,4 +518,8 @@ extern void mmc_unregister_driver(struct mmc_driver *);
extern void mmc_fixup_device(struct mmc_card *card,
const struct mmc_fixup *table);

+extern struct mmc_wr_pack_stats *mmc_blk_get_packed_statistics(
+ struct mmc_card *card);
+extern void mmc_blk_init_packed_statistics(struct mmc_card *card);
+
#endif /* LINUX_MMC_CARD_H */
--
1.7.3.3
--
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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