mmc: block: Adding device attribute for minimum sectors to start BKOPS
This attribute is used to determine whether the status bit that
indicates the need for BKOPS should be checked. The value is stored in
this attribute represents the minimum number of sectors that needs to
be changed in the device (written or discarded) in order to require
the status-bit of BKOPS to be checked
(cherry picked from commit e6c6b4b14ac2f10aa34cf42b6f558152e438bb37)
Change-Id: I3b05a0826fc9397a13d6b03ee028293f877f8d66
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
(cherry picked from commit 15ecbe1c5f6b2f2af5974f23cd494fce0c5bf81a)
diff --git a/Documentation/mmc/mmc-dev-attrs.txt b/Documentation/mmc/mmc-dev-attrs.txt
index 08f7312..7dde34f 100644
--- a/Documentation/mmc/mmc-dev-attrs.txt
+++ b/Documentation/mmc/mmc-dev-attrs.txt
@@ -25,6 +25,15 @@
running parallel lmdd write and lmdd read operations and calculating
the max number of packed writes requests.
+ min_sectors_to_check_bkops_status This attribute is used to
+ determine whether the status bit that indicates the need for BKOPS
+ should be checked. The value is stored in this attribute represents
+ the minimum number of sectors that needs to be changed in the device
+ (written or discarded) in order to require the status-bit of BKOPS
+ to be checked. The value can modified via sysfs by writing the
+ required value to:
+ /sys/block/<block_dev_name>/min_sectors_to_check_bkops_status
+
SD and MMC Device Attributes
============================
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index b9cd8ec..7387d9a 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -121,6 +121,7 @@
struct device_attribute force_ro;
struct device_attribute power_ro_lock;
struct device_attribute num_wr_reqs_to_start_packing;
+ struct device_attribute min_sectors_to_check_bkops_status;
int area_type;
};
@@ -306,6 +307,48 @@
return count;
}
+static ssize_t
+min_sectors_to_check_bkops_status_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
+ unsigned int min_sectors_to_check_bkops_status;
+ struct mmc_card *card = md->queue.card;
+ int ret;
+
+ if (!card)
+ return -EINVAL;
+
+ min_sectors_to_check_bkops_status =
+ card->bkops_info.min_sectors_to_queue_delayed_work;
+
+ ret = snprintf(buf, PAGE_SIZE, "%d\n",
+ min_sectors_to_check_bkops_status);
+
+ mmc_blk_put(md);
+ return ret;
+}
+
+static ssize_t
+min_sectors_to_check_bkops_status_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int value;
+ struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
+ struct mmc_card *card = md->queue.card;
+
+ if (!card)
+ return -EINVAL;
+
+ sscanf(buf, "%d", &value);
+ if (value >= 0)
+ card->bkops_info.min_sectors_to_queue_delayed_work = value;
+
+ mmc_blk_put(md);
+ return count;
+}
+
static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
{
struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
@@ -2316,6 +2359,19 @@
if (ret)
goto power_ro_lock_fail;
+ md->min_sectors_to_check_bkops_status.show =
+ min_sectors_to_check_bkops_status_show;
+ md->min_sectors_to_check_bkops_status.store =
+ min_sectors_to_check_bkops_status_store;
+ sysfs_attr_init(&md->min_sectors_to_check_bkops_status.attr);
+ md->min_sectors_to_check_bkops_status.attr.name =
+ "min_sectors_to_check_bkops_status";
+ md->min_sectors_to_check_bkops_status.attr.mode = S_IRUGO | S_IWUSR;
+ ret = device_create_file(disk_to_dev(md->disk),
+ &md->min_sectors_to_check_bkops_status);
+ if (ret)
+ goto power_ro_lock_fail;
+
return ret;
power_ro_lock_fail:
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 9b9e8cc..7e03e5a 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -291,7 +291,7 @@
return;
if (card->bkops_info.sectors_changed <
- BKOPS_MIN_SECTORS_TO_QUEUE_DELAYED_WORK)
+ card->bkops_info.min_sectors_to_queue_delayed_work)
return;
pr_debug("%s: %s: queueing delayed_bkops_work\n",
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 457db7f..ca8b01c 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1336,6 +1336,8 @@
card->bkops_info.delay_ms,
card->bkops_info.host_suspend_tout_ms/2);
+ card->bkops_info.min_sectors_to_queue_delayed_work =
+ BKOPS_MIN_SECTORS_TO_QUEUE_DELAYED_WORK;
}
}
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 257bcc0..477733c 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -248,6 +248,7 @@
struct delayed_work dw;
unsigned int host_suspend_tout_ms;
unsigned int delay_ms;
+ unsigned int min_sectors_to_queue_delayed_work;
/*
* A default time for checking the need for non urgent BKOPS once mmcqd
* is idle.