1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2016
4 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
5 *
6 * Adjunct processor bus, card related code.
7 */
8
9#define KMSG_COMPONENT "ap"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12#include <linux/init.h>
13#include <linux/slab.h>
14#include <asm/facility.h>
15#include <asm/sclp.h>
16
17#include "ap_bus.h"
18
19/*
20 * AP card related attributes.
21 */
22static ssize_t hwtype_show(struct device *dev,
23			   struct device_attribute *attr, char *buf)
24{
25	struct ap_card *ac = to_ap_card(dev);
26
27	return scnprintf(buf, PAGE_SIZE, "%d\n", ac->ap_dev.device_type);
28}
29
30static DEVICE_ATTR_RO(hwtype);
31
32static ssize_t raw_hwtype_show(struct device *dev,
33			       struct device_attribute *attr, char *buf)
34{
35	struct ap_card *ac = to_ap_card(dev);
36
37	return scnprintf(buf, PAGE_SIZE, "%d\n", ac->raw_hwtype);
38}
39
40static DEVICE_ATTR_RO(raw_hwtype);
41
42static ssize_t depth_show(struct device *dev, struct device_attribute *attr,
43			  char *buf)
44{
45	struct ap_card *ac = to_ap_card(dev);
46
47	return scnprintf(buf, PAGE_SIZE, "%d\n", ac->queue_depth);
48}
49
50static DEVICE_ATTR_RO(depth);
51
52static ssize_t ap_functions_show(struct device *dev,
53				 struct device_attribute *attr, char *buf)
54{
55	struct ap_card *ac = to_ap_card(dev);
56
57	return scnprintf(buf, PAGE_SIZE, "0x%08X\n", ac->functions);
58}
59
60static DEVICE_ATTR_RO(ap_functions);
61
62static ssize_t request_count_show(struct device *dev,
63				  struct device_attribute *attr,
64				  char *buf)
65{
66	struct ap_card *ac = to_ap_card(dev);
67	u64 req_cnt;
68
69	req_cnt = 0;
70	spin_lock_bh(&ap_queues_lock);
71	req_cnt = atomic64_read(&ac->total_request_count);
72	spin_unlock_bh(&ap_queues_lock);
73	return scnprintf(buf, PAGE_SIZE, "%llu\n", req_cnt);
74}
75
76static ssize_t request_count_store(struct device *dev,
77				   struct device_attribute *attr,
78				   const char *buf, size_t count)
79{
80	int bkt;
81	struct ap_queue *aq;
82	struct ap_card *ac = to_ap_card(dev);
83
84	spin_lock_bh(&ap_queues_lock);
85	hash_for_each(ap_queues, bkt, aq, hnode)
86		if (ac == aq->card)
87			aq->total_request_count = 0;
88	spin_unlock_bh(&ap_queues_lock);
89	atomic64_set(&ac->total_request_count, 0);
90
91	return count;
92}
93
94static DEVICE_ATTR_RW(request_count);
95
96static ssize_t requestq_count_show(struct device *dev,
97				   struct device_attribute *attr, char *buf)
98{
99	int bkt;
100	struct ap_queue *aq;
101	unsigned int reqq_cnt;
102	struct ap_card *ac = to_ap_card(dev);
103
104	reqq_cnt = 0;
105	spin_lock_bh(&ap_queues_lock);
106	hash_for_each(ap_queues, bkt, aq, hnode)
107		if (ac == aq->card)
108			reqq_cnt += aq->requestq_count;
109	spin_unlock_bh(&ap_queues_lock);
110	return scnprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt);
111}
112
113static DEVICE_ATTR_RO(requestq_count);
114
115static ssize_t pendingq_count_show(struct device *dev,
116				   struct device_attribute *attr, char *buf)
117{
118	int bkt;
119	struct ap_queue *aq;
120	unsigned int penq_cnt;
121	struct ap_card *ac = to_ap_card(dev);
122
123	penq_cnt = 0;
124	spin_lock_bh(&ap_queues_lock);
125	hash_for_each(ap_queues, bkt, aq, hnode)
126		if (ac == aq->card)
127			penq_cnt += aq->pendingq_count;
128	spin_unlock_bh(&ap_queues_lock);
129	return scnprintf(buf, PAGE_SIZE, "%d\n", penq_cnt);
130}
131
132static DEVICE_ATTR_RO(pendingq_count);
133
134static ssize_t modalias_show(struct device *dev,
135			     struct device_attribute *attr, char *buf)
136{
137	return scnprintf(buf, PAGE_SIZE, "ap:t%02X\n",
138			 to_ap_dev(dev)->device_type);
139}
140
141static DEVICE_ATTR_RO(modalias);
142
143static ssize_t config_show(struct device *dev,
144			   struct device_attribute *attr, char *buf)
145{
146	struct ap_card *ac = to_ap_card(dev);
147
148	return scnprintf(buf, PAGE_SIZE, "%d\n", ac->config ? 1 : 0);
149}
150
151static ssize_t config_store(struct device *dev,
152			    struct device_attribute *attr,
153			    const char *buf, size_t count)
154{
155	int rc = 0, cfg;
156	struct ap_card *ac = to_ap_card(dev);
157
158	if (sscanf(buf, "%d\n", &cfg) != 1 || cfg < 0 || cfg > 1)
159		return -EINVAL;
160
161	if (cfg && !ac->config)
162		rc = sclp_ap_configure(ac->id);
163	else if (!cfg && ac->config)
164		rc = sclp_ap_deconfigure(ac->id);
165	if (rc)
166		return rc;
167
168	ac->config = cfg ? true : false;
169
170	return count;
171}
172
173static DEVICE_ATTR_RW(config);
174
175static struct attribute *ap_card_dev_attrs[] = {
176	&dev_attr_hwtype.attr,
177	&dev_attr_raw_hwtype.attr,
178	&dev_attr_depth.attr,
179	&dev_attr_ap_functions.attr,
180	&dev_attr_request_count.attr,
181	&dev_attr_requestq_count.attr,
182	&dev_attr_pendingq_count.attr,
183	&dev_attr_modalias.attr,
184	&dev_attr_config.attr,
185	NULL
186};
187
188static struct attribute_group ap_card_dev_attr_group = {
189	.attrs = ap_card_dev_attrs
190};
191
192static const struct attribute_group *ap_card_dev_attr_groups[] = {
193	&ap_card_dev_attr_group,
194	NULL
195};
196
197static struct device_type ap_card_type = {
198	.name = "ap_card",
199	.groups = ap_card_dev_attr_groups,
200};
201
202static void ap_card_device_release(struct device *dev)
203{
204	struct ap_card *ac = to_ap_card(dev);
205
206	kfree(ac);
207}
208
209struct ap_card *ap_card_create(int id, int queue_depth, int raw_type,
210			       int comp_type, unsigned int functions)
211{
212	struct ap_card *ac;
213
214	ac = kzalloc(sizeof(*ac), GFP_KERNEL);
215	if (!ac)
216		return NULL;
217	ac->ap_dev.device.release = ap_card_device_release;
218	ac->ap_dev.device.type = &ap_card_type;
219	ac->ap_dev.device_type = comp_type;
220	ac->raw_hwtype = raw_type;
221	ac->queue_depth = queue_depth;
222	ac->functions = functions;
223	ac->id = id;
224	return ac;
225}
226