tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
16#include "ap_bus.h"
17
18/*
19 * AP card related attributes.
20 */
21static ssize_t hwtype_show(struct device *dev,
22 struct device_attribute *attr, char *buf)
23{
24 struct ap_card *ac = to_ap_card(dev);
25
26 return snprintf(buf, PAGE_SIZE, "%d\n", ac->ap_dev.device_type);
27}
28
29static DEVICE_ATTR_RO(hwtype);
30
31static ssize_t raw_hwtype_show(struct device *dev,
32 struct device_attribute *attr, char *buf)
33{
34 struct ap_card *ac = to_ap_card(dev);
35
36 return snprintf(buf, PAGE_SIZE, "%d\n", ac->raw_hwtype);
37}
38
39static DEVICE_ATTR_RO(raw_hwtype);
40
41static ssize_t depth_show(struct device *dev, struct device_attribute *attr,
42 char *buf)
43{
44 struct ap_card *ac = to_ap_card(dev);
45
46 return snprintf(buf, PAGE_SIZE, "%d\n", ac->queue_depth);
47}
48
49static DEVICE_ATTR_RO(depth);
50
51static ssize_t ap_functions_show(struct device *dev,
52 struct device_attribute *attr, char *buf)
53{
54 struct ap_card *ac = to_ap_card(dev);
55
56 return snprintf(buf, PAGE_SIZE, "0x%08X\n", ac->functions);
57}
58
59static DEVICE_ATTR_RO(ap_functions);
60
61static ssize_t request_count_show(struct device *dev,
62 struct device_attribute *attr,
63 char *buf)
64{
65 struct ap_card *ac = to_ap_card(dev);
66 unsigned int req_cnt;
67
68 req_cnt = 0;
69 spin_lock_bh(&ap_list_lock);
70 req_cnt = atomic_read(&ac->total_request_count);
71 spin_unlock_bh(&ap_list_lock);
72 return snprintf(buf, PAGE_SIZE, "%d\n", req_cnt);
73}
74
75static ssize_t request_count_store(struct device *dev,
76 struct device_attribute *attr,
77 const char *buf, size_t count)
78{
79 struct ap_card *ac = to_ap_card(dev);
80 struct ap_queue *aq;
81
82 spin_lock_bh(&ap_list_lock);
83 for_each_ap_queue(aq, ac)
84 aq->total_request_count = 0;
85 spin_unlock_bh(&ap_list_lock);
86 atomic_set(&ac->total_request_count, 0);
87
88 return count;
89}
90
91static DEVICE_ATTR_RW(request_count);
92
93static ssize_t requestq_count_show(struct device *dev,
94 struct device_attribute *attr, char *buf)
95{
96 struct ap_card *ac = to_ap_card(dev);
97 struct ap_queue *aq;
98 unsigned int reqq_cnt;
99
100 reqq_cnt = 0;
101 spin_lock_bh(&ap_list_lock);
102 for_each_ap_queue(aq, ac)
103 reqq_cnt += aq->requestq_count;
104 spin_unlock_bh(&ap_list_lock);
105 return snprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt);
106}
107
108static DEVICE_ATTR_RO(requestq_count);
109
110static ssize_t pendingq_count_show(struct device *dev,
111 struct device_attribute *attr, char *buf)
112{
113 struct ap_card *ac = to_ap_card(dev);
114 struct ap_queue *aq;
115 unsigned int penq_cnt;
116
117 penq_cnt = 0;
118 spin_lock_bh(&ap_list_lock);
119 for_each_ap_queue(aq, ac)
120 penq_cnt += aq->pendingq_count;
121 spin_unlock_bh(&ap_list_lock);
122 return snprintf(buf, PAGE_SIZE, "%d\n", penq_cnt);
123}
124
125static DEVICE_ATTR_RO(pendingq_count);
126
127static ssize_t modalias_show(struct device *dev,
128 struct device_attribute *attr, char *buf)
129{
130 return sprintf(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type);
131}
132
133static DEVICE_ATTR_RO(modalias);
134
135static struct attribute *ap_card_dev_attrs[] = {
136 &dev_attr_hwtype.attr,
137 &dev_attr_raw_hwtype.attr,
138 &dev_attr_depth.attr,
139 &dev_attr_ap_functions.attr,
140 &dev_attr_request_count.attr,
141 &dev_attr_requestq_count.attr,
142 &dev_attr_pendingq_count.attr,
143 &dev_attr_modalias.attr,
144 NULL
145};
146
147static struct attribute_group ap_card_dev_attr_group = {
148 .attrs = ap_card_dev_attrs
149};
150
151static const struct attribute_group *ap_card_dev_attr_groups[] = {
152 &ap_card_dev_attr_group,
153 NULL
154};
155
156static struct device_type ap_card_type = {
157 .name = "ap_card",
158 .groups = ap_card_dev_attr_groups,
159};
160
161static void ap_card_device_release(struct device *dev)
162{
163 struct ap_card *ac = to_ap_card(dev);
164
165 if (!list_empty(&ac->list)) {
166 spin_lock_bh(&ap_list_lock);
167 list_del_init(&ac->list);
168 spin_unlock_bh(&ap_list_lock);
169 }
170 kfree(ac);
171}
172
173struct ap_card *ap_card_create(int id, int queue_depth, int raw_type,
174 int comp_type, unsigned int functions)
175{
176 struct ap_card *ac;
177
178 ac = kzalloc(sizeof(*ac), GFP_KERNEL);
179 if (!ac)
180 return NULL;
181 INIT_LIST_HEAD(&ac->list);
182 INIT_LIST_HEAD(&ac->queues);
183 ac->ap_dev.device.release = ap_card_device_release;
184 ac->ap_dev.device.type = &ap_card_type;
185 ac->ap_dev.device_type = comp_type;
186 ac->raw_hwtype = raw_type;
187 ac->queue_depth = queue_depth;
188 ac->functions = functions;
189 ac->id = id;
190 return ac;
191}