![Harald Freudenberger](/assets/img/avatar_default.png)
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>
187 lines
4.6 KiB
C
187 lines
4.6 KiB
C
/*
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* Copyright IBM Corp. 2016
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*
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* Adjunct processor bus, card related code.
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*/
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#define KMSG_COMPONENT "ap"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <asm/facility.h>
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#include "ap_bus.h"
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#include "ap_asm.h"
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/*
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* AP card related attributes.
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*/
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static ssize_t ap_hwtype_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ap_card *ac = to_ap_card(dev);
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return snprintf(buf, PAGE_SIZE, "%d\n", ac->ap_dev.device_type);
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}
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static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL);
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static ssize_t ap_raw_hwtype_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ap_card *ac = to_ap_card(dev);
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return snprintf(buf, PAGE_SIZE, "%d\n", ac->raw_hwtype);
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}
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static DEVICE_ATTR(raw_hwtype, 0444, ap_raw_hwtype_show, NULL);
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static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct ap_card *ac = to_ap_card(dev);
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return snprintf(buf, PAGE_SIZE, "%d\n", ac->queue_depth);
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}
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static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL);
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static ssize_t ap_functions_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ap_card *ac = to_ap_card(dev);
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return snprintf(buf, PAGE_SIZE, "0x%08X\n", ac->functions);
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}
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static DEVICE_ATTR(ap_functions, 0444, ap_functions_show, NULL);
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static ssize_t ap_req_count_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct ap_card *ac = to_ap_card(dev);
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unsigned int req_cnt;
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req_cnt = 0;
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spin_lock_bh(&ap_list_lock);
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req_cnt = atomic_read(&ac->total_request_count);
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spin_unlock_bh(&ap_list_lock);
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return snprintf(buf, PAGE_SIZE, "%d\n", req_cnt);
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}
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static ssize_t ap_req_count_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ap_card *ac = to_ap_card(dev);
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struct ap_queue *aq;
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spin_lock_bh(&ap_list_lock);
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for_each_ap_queue(aq, ac)
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aq->total_request_count = 0;
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spin_unlock_bh(&ap_list_lock);
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atomic_set(&ac->total_request_count, 0);
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return count;
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}
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static DEVICE_ATTR(request_count, 0644, ap_req_count_show, ap_req_count_store);
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static ssize_t ap_requestq_count_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ap_card *ac = to_ap_card(dev);
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struct ap_queue *aq;
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unsigned int reqq_cnt;
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reqq_cnt = 0;
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spin_lock_bh(&ap_list_lock);
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for_each_ap_queue(aq, ac)
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reqq_cnt += aq->requestq_count;
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spin_unlock_bh(&ap_list_lock);
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return snprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt);
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}
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static DEVICE_ATTR(requestq_count, 0444, ap_requestq_count_show, NULL);
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static ssize_t ap_pendingq_count_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ap_card *ac = to_ap_card(dev);
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struct ap_queue *aq;
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unsigned int penq_cnt;
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penq_cnt = 0;
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spin_lock_bh(&ap_list_lock);
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for_each_ap_queue(aq, ac)
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penq_cnt += aq->pendingq_count;
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spin_unlock_bh(&ap_list_lock);
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return snprintf(buf, PAGE_SIZE, "%d\n", penq_cnt);
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}
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static DEVICE_ATTR(pendingq_count, 0444, ap_pendingq_count_show, NULL);
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static ssize_t ap_modalias_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type);
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}
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static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL);
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static struct attribute *ap_card_dev_attrs[] = {
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&dev_attr_hwtype.attr,
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&dev_attr_raw_hwtype.attr,
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&dev_attr_depth.attr,
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&dev_attr_ap_functions.attr,
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&dev_attr_request_count.attr,
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&dev_attr_requestq_count.attr,
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&dev_attr_pendingq_count.attr,
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&dev_attr_modalias.attr,
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NULL
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};
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static struct attribute_group ap_card_dev_attr_group = {
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.attrs = ap_card_dev_attrs
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};
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static const struct attribute_group *ap_card_dev_attr_groups[] = {
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&ap_card_dev_attr_group,
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NULL
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};
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static struct device_type ap_card_type = {
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.name = "ap_card",
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.groups = ap_card_dev_attr_groups,
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};
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static void ap_card_device_release(struct device *dev)
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{
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kfree(to_ap_card(dev));
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}
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struct ap_card *ap_card_create(int id, int queue_depth, int device_type,
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unsigned int functions)
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{
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struct ap_card *ac;
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ac = kzalloc(sizeof(*ac), GFP_KERNEL);
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if (!ac)
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return NULL;
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INIT_LIST_HEAD(&ac->queues);
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ac->ap_dev.device.release = ap_card_device_release;
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ac->ap_dev.device.type = &ap_card_type;
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ac->ap_dev.device_type = device_type;
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/* CEX6 toleration: map to CEX5 */
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if (device_type == AP_DEVICE_TYPE_CEX6)
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ac->ap_dev.device_type = AP_DEVICE_TYPE_CEX5;
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ac->raw_hwtype = device_type;
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ac->queue_depth = queue_depth;
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ac->functions = functions;
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ac->id = id;
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return ac;
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}
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