diff options
| author | Harald Freudenberger <freude@linux.vnet.ibm.com> | 2016-11-15 09:05:00 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-02-23 10:06:39 +0100 |
| commit | d0360d7b523f150c2ff0ab3c9361dfc3b4185cbf (patch) | |
| tree | b80655186deb374865263cb274c5d1a46791f877 /drivers/s390/crypto/ap_card.c | |
| parent | s390/mm: use _SEGMENT_ENTRY_EMPTY in the code (diff) | |
| download | linux-d0360d7b523f150c2ff0ab3c9361dfc3b4185cbf.tar.xz linux-d0360d7b523f150c2ff0ab3c9361dfc3b4185cbf.zip | |
s390/zcrypt: Enable request count reset for cards and queues.
This patch introduces the possibility to reset the
request_count attribute for cards and queues to zero.
This can be used to set a clear state on the counters before
running an application and try out if and which hardware is
actually used. If the request_count counter of a card is
reset, for all associated queues the request_count is also
zeroed. If just a queue request_count is reset the card
counter is not updated however.
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/crypto/ap_card.c')
| -rw-r--r-- | drivers/s390/crypto/ap_card.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/drivers/s390/crypto/ap_card.c b/drivers/s390/crypto/ap_card.c index 1cd9128593e4..cfa161ccc74e 100644 --- a/drivers/s390/crypto/ap_card.c +++ b/drivers/s390/crypto/ap_card.c @@ -58,9 +58,9 @@ static ssize_t ap_functions_show(struct device *dev, static DEVICE_ATTR(ap_functions, 0444, ap_functions_show, NULL); -static ssize_t ap_request_count_show(struct device *dev, - struct device_attribute *attr, - char *buf) +static ssize_t ap_req_count_show(struct device *dev, + struct device_attribute *attr, + char *buf) { struct ap_card *ac = to_ap_card(dev); unsigned int req_cnt; @@ -72,7 +72,23 @@ static ssize_t ap_request_count_show(struct device *dev, return snprintf(buf, PAGE_SIZE, "%d\n", req_cnt); } -static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL); +static ssize_t ap_req_count_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ap_card *ac = to_ap_card(dev); + struct ap_queue *aq; + + spin_lock_bh(&ap_list_lock); + for_each_ap_queue(aq, ac) + aq->total_request_count = 0; + spin_unlock_bh(&ap_list_lock); + atomic_set(&ac->total_request_count, 0); + + return count; +} + +static DEVICE_ATTR(request_count, 0644, ap_req_count_show, ap_req_count_store); static ssize_t ap_requestq_count_show(struct device *dev, struct device_attribute *attr, char *buf) |