diff options
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/Kconfig | 2 | ||||
-rw-r--r-- | drivers/Makefile | 1 | ||||
-rw-r--r-- | drivers/dca/Kconfig | 11 | ||||
-rw-r--r-- | drivers/dca/Makefile | 2 | ||||
-rw-r--r-- | drivers/dca/dca-core.c | 200 | ||||
-rw-r--r-- | drivers/dca/dca-sysfs.c | 88 |
6 files changed, 304 insertions, 0 deletions
diff --git a/drivers/Kconfig b/drivers/Kconfig index 7bdae47d6b91..4fb134d50da7 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig | |||
@@ -84,6 +84,8 @@ source "drivers/rtc/Kconfig" | |||
84 | 84 | ||
85 | source "drivers/dma/Kconfig" | 85 | source "drivers/dma/Kconfig" |
86 | 86 | ||
87 | source "drivers/dca/Kconfig" | ||
88 | |||
87 | source "drivers/auxdisplay/Kconfig" | 89 | source "drivers/auxdisplay/Kconfig" |
88 | 90 | ||
89 | source "drivers/kvm/Kconfig" | 91 | source "drivers/kvm/Kconfig" |
diff --git a/drivers/Makefile b/drivers/Makefile index a168eacdcd9c..174c27eb4430 100644 --- a/drivers/Makefile +++ b/drivers/Makefile | |||
@@ -85,6 +85,7 @@ obj-$(CONFIG_CRYPTO) += crypto/ | |||
85 | obj-$(CONFIG_SUPERH) += sh/ | 85 | obj-$(CONFIG_SUPERH) += sh/ |
86 | obj-$(CONFIG_GENERIC_TIME) += clocksource/ | 86 | obj-$(CONFIG_GENERIC_TIME) += clocksource/ |
87 | obj-$(CONFIG_DMA_ENGINE) += dma/ | 87 | obj-$(CONFIG_DMA_ENGINE) += dma/ |
88 | obj-$(CONFIG_DCA) += dca/ | ||
88 | obj-$(CONFIG_HID) += hid/ | 89 | obj-$(CONFIG_HID) += hid/ |
89 | obj-$(CONFIG_PPC_PS3) += ps3/ | 90 | obj-$(CONFIG_PPC_PS3) += ps3/ |
90 | obj-$(CONFIG_OF) += of/ | 91 | obj-$(CONFIG_OF) += of/ |
diff --git a/drivers/dca/Kconfig b/drivers/dca/Kconfig new file mode 100644 index 000000000000..e2f7436da051 --- /dev/null +++ b/drivers/dca/Kconfig | |||
@@ -0,0 +1,11 @@ | |||
1 | # | ||
2 | # DCA server configuration | ||
3 | # | ||
4 | |||
5 | config DCA | ||
6 | tristate "DCA support for clients and providers" | ||
7 | default m | ||
8 | help | ||
9 | This is a server to help modules that want to use Direct Cache | ||
10 | Access to find DCA providers that will supply correct CPU tags. | ||
11 | |||
diff --git a/drivers/dca/Makefile b/drivers/dca/Makefile new file mode 100644 index 000000000000..b2db56bb9dde --- /dev/null +++ b/drivers/dca/Makefile | |||
@@ -0,0 +1,2 @@ | |||
1 | obj-$(CONFIG_DCA) += dca.o | ||
2 | dca-objs := dca-core.o dca-sysfs.o | ||
diff --git a/drivers/dca/dca-core.c b/drivers/dca/dca-core.c new file mode 100644 index 000000000000..bf5b92f86df7 --- /dev/null +++ b/drivers/dca/dca-core.c | |||
@@ -0,0 +1,200 @@ | |||
1 | /* | ||
2 | * Copyright(c) 2007 Intel Corporation. All rights reserved. | ||
3 | * | ||
4 | * This program is free software; you can redistribute it and/or modify it | ||
5 | * under the terms of the GNU General Public License as published by the Free | ||
6 | * Software Foundation; either version 2 of the License, or (at your option) | ||
7 | * any later version. | ||
8 | * | ||
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | ||
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | ||
12 | * more details. | ||
13 | * | ||
14 | * You should have received a copy of the GNU General Public License along with | ||
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 | ||
16 | * Temple Place - Suite 330, Boston, MA 02111-1307, USA. | ||
17 | * | ||
18 | * The full GNU General Public License is included in this distribution in the | ||
19 | * file called COPYING. | ||
20 | */ | ||
21 | |||
22 | /* | ||
23 | * This driver supports an interface for DCA clients and providers to meet. | ||
24 | */ | ||
25 | |||
26 | #include <linux/kernel.h> | ||
27 | #include <linux/notifier.h> | ||
28 | #include <linux/device.h> | ||
29 | #include <linux/dca.h> | ||
30 | |||
31 | MODULE_LICENSE("GPL"); | ||
32 | |||
33 | /* For now we're assuming a single, global, DCA provider for the system. */ | ||
34 | |||
35 | static DEFINE_SPINLOCK(dca_lock); | ||
36 | |||
37 | static struct dca_provider *global_dca = NULL; | ||
38 | |||
39 | /** | ||
40 | * dca_add_requester - add a dca client to the list | ||
41 | * @dev - the device that wants dca service | ||
42 | */ | ||
43 | int dca_add_requester(struct device *dev) | ||
44 | { | ||
45 | int err, slot; | ||
46 | |||
47 | if (!global_dca) | ||
48 | return -ENODEV; | ||
49 | |||
50 | spin_lock(&dca_lock); | ||
51 | slot = global_dca->ops->add_requester(global_dca, dev); | ||
52 | spin_unlock(&dca_lock); | ||
53 | if (slot < 0) | ||
54 | return slot; | ||
55 | |||
56 | err = dca_sysfs_add_req(global_dca, dev, slot); | ||
57 | if (err) { | ||
58 | spin_lock(&dca_lock); | ||
59 | global_dca->ops->remove_requester(global_dca, dev); | ||
60 | spin_unlock(&dca_lock); | ||
61 | return err; | ||
62 | } | ||
63 | |||
64 | return 0; | ||
65 | } | ||
66 | EXPORT_SYMBOL_GPL(dca_add_requester); | ||
67 | |||
68 | /** | ||
69 | * dca_remove_requester - remove a dca client from the list | ||
70 | * @dev - the device that wants dca service | ||
71 | */ | ||
72 | int dca_remove_requester(struct device *dev) | ||
73 | { | ||
74 | int slot; | ||
75 | if (!global_dca) | ||
76 | return -ENODEV; | ||
77 | |||
78 | spin_lock(&dca_lock); | ||
79 | slot = global_dca->ops->remove_requester(global_dca, dev); | ||
80 | spin_unlock(&dca_lock); | ||
81 | if (slot < 0) | ||
82 | return slot; | ||
83 | |||
84 | dca_sysfs_remove_req(global_dca, slot); | ||
85 | return 0; | ||
86 | } | ||
87 | EXPORT_SYMBOL_GPL(dca_remove_requester); | ||
88 | |||
89 | /** | ||
90 | * dca_get_tag - return the dca tag for the given cpu | ||
91 | * @cpu - the cpuid as returned by get_cpu() | ||
92 | */ | ||
93 | u8 dca_get_tag(int cpu) | ||
94 | { | ||
95 | if (!global_dca) | ||
96 | return -ENODEV; | ||
97 | return global_dca->ops->get_tag(global_dca, cpu); | ||
98 | } | ||
99 | EXPORT_SYMBOL_GPL(dca_get_tag); | ||
100 | |||
101 | /** | ||
102 | * alloc_dca_provider - get data struct for describing a dca provider | ||
103 | * @ops - pointer to struct of dca operation function pointers | ||
104 | * @priv_size - size of extra mem to be added for provider's needs | ||
105 | */ | ||
106 | struct dca_provider *alloc_dca_provider(struct dca_ops *ops, int priv_size) | ||
107 | { | ||
108 | struct dca_provider *dca; | ||
109 | int alloc_size; | ||
110 | |||
111 | alloc_size = (sizeof(*dca) + priv_size); | ||
112 | dca = kzalloc(alloc_size, GFP_KERNEL); | ||
113 | if (!dca) | ||
114 | return NULL; | ||
115 | dca->ops = ops; | ||
116 | |||
117 | return dca; | ||
118 | } | ||
119 | EXPORT_SYMBOL_GPL(alloc_dca_provider); | ||
120 | |||
121 | /** | ||
122 | * free_dca_provider - release the dca provider data struct | ||
123 | * @ops - pointer to struct of dca operation function pointers | ||
124 | * @priv_size - size of extra mem to be added for provider's needs | ||
125 | */ | ||
126 | void free_dca_provider(struct dca_provider *dca) | ||
127 | { | ||
128 | kfree(dca); | ||
129 | } | ||
130 | EXPORT_SYMBOL_GPL(free_dca_provider); | ||
131 | |||
132 | static BLOCKING_NOTIFIER_HEAD(dca_provider_chain); | ||
133 | |||
134 | /** | ||
135 | * register_dca_provider - register a dca provider | ||
136 | * @dca - struct created by alloc_dca_provider() | ||
137 | * @dev - device providing dca services | ||
138 | */ | ||
139 | int register_dca_provider(struct dca_provider *dca, struct device *dev) | ||
140 | { | ||
141 | int err; | ||
142 | |||
143 | if (global_dca) | ||
144 | return -EEXIST; | ||
145 | err = dca_sysfs_add_provider(dca, dev); | ||
146 | if (err) | ||
147 | return err; | ||
148 | global_dca = dca; | ||
149 | blocking_notifier_call_chain(&dca_provider_chain, | ||
150 | DCA_PROVIDER_ADD, NULL); | ||
151 | return 0; | ||
152 | } | ||
153 | EXPORT_SYMBOL_GPL(register_dca_provider); | ||
154 | |||
155 | /** | ||
156 | * unregister_dca_provider - remove a dca provider | ||
157 | * @dca - struct created by alloc_dca_provider() | ||
158 | */ | ||
159 | void unregister_dca_provider(struct dca_provider *dca) | ||
160 | { | ||
161 | if (!global_dca) | ||
162 | return; | ||
163 | blocking_notifier_call_chain(&dca_provider_chain, | ||
164 | DCA_PROVIDER_REMOVE, NULL); | ||
165 | global_dca = NULL; | ||
166 | dca_sysfs_remove_provider(dca); | ||
167 | } | ||
168 | EXPORT_SYMBOL_GPL(unregister_dca_provider); | ||
169 | |||
170 | /** | ||
171 | * dca_register_notify - register a client's notifier callback | ||
172 | */ | ||
173 | void dca_register_notify(struct notifier_block *nb) | ||
174 | { | ||
175 | blocking_notifier_chain_register(&dca_provider_chain, nb); | ||
176 | } | ||
177 | EXPORT_SYMBOL_GPL(dca_register_notify); | ||
178 | |||
179 | /** | ||
180 | * dca_unregister_notify - remove a client's notifier callback | ||
181 | */ | ||
182 | void dca_unregister_notify(struct notifier_block *nb) | ||
183 | { | ||
184 | blocking_notifier_chain_unregister(&dca_provider_chain, nb); | ||
185 | } | ||
186 | EXPORT_SYMBOL_GPL(dca_unregister_notify); | ||
187 | |||
188 | static int __init dca_init(void) | ||
189 | { | ||
190 | return dca_sysfs_init(); | ||
191 | } | ||
192 | |||
193 | static void __exit dca_exit(void) | ||
194 | { | ||
195 | dca_sysfs_exit(); | ||
196 | } | ||
197 | |||
198 | module_init(dca_init); | ||
199 | module_exit(dca_exit); | ||
200 | |||
diff --git a/drivers/dca/dca-sysfs.c b/drivers/dca/dca-sysfs.c new file mode 100644 index 000000000000..24a263b6844c --- /dev/null +++ b/drivers/dca/dca-sysfs.c | |||
@@ -0,0 +1,88 @@ | |||
1 | #include <linux/kernel.h> | ||
2 | #include <linux/spinlock.h> | ||
3 | #include <linux/device.h> | ||
4 | #include <linux/idr.h> | ||
5 | #include <linux/kdev_t.h> | ||
6 | #include <linux/err.h> | ||
7 | #include <linux/dca.h> | ||
8 | |||
9 | static struct class *dca_class; | ||
10 | static struct idr dca_idr; | ||
11 | static spinlock_t dca_idr_lock; | ||
12 | |||
13 | int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot) | ||
14 | { | ||
15 | struct class_device *cd; | ||
16 | |||
17 | cd = class_device_create(dca_class, dca->cd, MKDEV(0, slot + 1), | ||
18 | dev, "requester%d", slot); | ||
19 | if (IS_ERR(cd)) | ||
20 | return PTR_ERR(cd); | ||
21 | return 0; | ||
22 | } | ||
23 | |||
24 | void dca_sysfs_remove_req(struct dca_provider *dca, int slot) | ||
25 | { | ||
26 | class_device_destroy(dca_class, MKDEV(0, slot + 1)); | ||
27 | } | ||
28 | |||
29 | int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev) | ||
30 | { | ||
31 | struct class_device *cd; | ||
32 | int err = 0; | ||
33 | |||
34 | idr_try_again: | ||
35 | if (!idr_pre_get(&dca_idr, GFP_KERNEL)) | ||
36 | return -ENOMEM; | ||
37 | spin_lock(&dca_idr_lock); | ||
38 | err = idr_get_new(&dca_idr, dca, &dca->id); | ||
39 | spin_unlock(&dca_idr_lock); | ||
40 | switch (err) { | ||
41 | case 0: | ||
42 | break; | ||
43 | case -EAGAIN: | ||
44 | goto idr_try_again; | ||
45 | default: | ||
46 | return err; | ||
47 | } | ||
48 | |||
49 | cd = class_device_create(dca_class, NULL, MKDEV(0, 0), | ||
50 | dev, "dca%d", dca->id); | ||
51 | if (IS_ERR(cd)) { | ||
52 | spin_lock(&dca_idr_lock); | ||
53 | idr_remove(&dca_idr, dca->id); | ||
54 | spin_unlock(&dca_idr_lock); | ||
55 | return PTR_ERR(cd); | ||
56 | } | ||
57 | dca->cd = cd; | ||
58 | return 0; | ||
59 | } | ||
60 | |||
61 | void dca_sysfs_remove_provider(struct dca_provider *dca) | ||
62 | { | ||
63 | class_device_unregister(dca->cd); | ||
64 | dca->cd = NULL; | ||
65 | spin_lock(&dca_idr_lock); | ||
66 | idr_remove(&dca_idr, dca->id); | ||
67 | spin_unlock(&dca_idr_lock); | ||
68 | } | ||
69 | |||
70 | int __init dca_sysfs_init(void) | ||
71 | { | ||
72 | idr_init(&dca_idr); | ||
73 | spin_lock_init(&dca_idr_lock); | ||
74 | |||
75 | dca_class = class_create(THIS_MODULE, "dca"); | ||
76 | if (IS_ERR(dca_class)) { | ||
77 | idr_destroy(&dca_idr); | ||
78 | return PTR_ERR(dca_class); | ||
79 | } | ||
80 | return 0; | ||
81 | } | ||
82 | |||
83 | void __exit dca_sysfs_exit(void) | ||
84 | { | ||
85 | class_destroy(dca_class); | ||
86 | idr_destroy(&dca_idr); | ||
87 | } | ||
88 | |||