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20#define pr_fmt(fmt) "pciehp: " fmt
21#define dev_fmt pr_fmt
22
23#include <linux/moduleparam.h>
24#include <linux/kernel.h>
25#include <linux/slab.h>
26#include <linux/types.h>
27#include <linux/pci.h>
28#include "pciehp.h"
29
30#include "../pci.h"
31
32
33bool pciehp_poll_mode;
34int pciehp_poll_time;
35
36
37
38
39
40module_param(pciehp_poll_mode, bool, 0644);
41module_param(pciehp_poll_time, int, 0644);
42MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
43MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
44
45static int set_attention_status(struct hotplug_slot *slot, u8 value);
46static int get_power_status(struct hotplug_slot *slot, u8 *value);
47static int get_latch_status(struct hotplug_slot *slot, u8 *value);
48static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
49
50static int init_slot(struct controller *ctrl)
51{
52 struct hotplug_slot_ops *ops;
53 char name[SLOT_NAME_SIZE];
54 int retval;
55
56
57 ops = kzalloc(sizeof(*ops), GFP_KERNEL);
58 if (!ops)
59 return -ENOMEM;
60
61 ops->enable_slot = pciehp_sysfs_enable_slot;
62 ops->disable_slot = pciehp_sysfs_disable_slot;
63 ops->get_power_status = get_power_status;
64 ops->get_adapter_status = get_adapter_status;
65 ops->reset_slot = pciehp_reset_slot;
66 if (MRL_SENS(ctrl))
67 ops->get_latch_status = get_latch_status;
68 if (ATTN_LED(ctrl)) {
69 ops->get_attention_status = pciehp_get_attention_status;
70 ops->set_attention_status = set_attention_status;
71 } else if (ctrl->pcie->port->hotplug_user_indicators) {
72 ops->get_attention_status = pciehp_get_raw_indicator_status;
73 ops->set_attention_status = pciehp_set_raw_indicator_status;
74 }
75
76
77 ctrl->hotplug_slot.ops = ops;
78 snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl));
79
80 retval = pci_hp_initialize(&ctrl->hotplug_slot,
81 ctrl->pcie->port->subordinate, 0, name);
82 if (retval) {
83 ctrl_err(ctrl, "pci_hp_initialize failed: error %d\n", retval);
84 kfree(ops);
85 }
86 return retval;
87}
88
89static void cleanup_slot(struct controller *ctrl)
90{
91 struct hotplug_slot *hotplug_slot = &ctrl->hotplug_slot;
92
93 pci_hp_destroy(hotplug_slot);
94 kfree(hotplug_slot->ops);
95}
96
97
98
99
100static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
101{
102 struct controller *ctrl = to_ctrl(hotplug_slot);
103 struct pci_dev *pdev = ctrl->pcie->port;
104
105 pci_config_pm_runtime_get(pdev);
106 pciehp_set_attention_status(ctrl, status);
107 pci_config_pm_runtime_put(pdev);
108 return 0;
109}
110
111static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
112{
113 struct controller *ctrl = to_ctrl(hotplug_slot);
114 struct pci_dev *pdev = ctrl->pcie->port;
115
116 pci_config_pm_runtime_get(pdev);
117 pciehp_get_power_status(ctrl, value);
118 pci_config_pm_runtime_put(pdev);
119 return 0;
120}
121
122static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
123{
124 struct controller *ctrl = to_ctrl(hotplug_slot);
125 struct pci_dev *pdev = ctrl->pcie->port;
126
127 pci_config_pm_runtime_get(pdev);
128 pciehp_get_latch_status(ctrl, value);
129 pci_config_pm_runtime_put(pdev);
130 return 0;
131}
132
133static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
134{
135 struct controller *ctrl = to_ctrl(hotplug_slot);
136 struct pci_dev *pdev = ctrl->pcie->port;
137
138 pci_config_pm_runtime_get(pdev);
139 *value = pciehp_card_present_or_link_active(ctrl);
140 pci_config_pm_runtime_put(pdev);
141 return 0;
142}
143
144
145
146
147
148
149
150
151
152
153
154static void pciehp_check_presence(struct controller *ctrl)
155{
156 bool occupied;
157
158 down_read(&ctrl->reset_lock);
159 mutex_lock(&ctrl->state_lock);
160
161 occupied = pciehp_card_present_or_link_active(ctrl);
162 if ((occupied && (ctrl->state == OFF_STATE ||
163 ctrl->state == BLINKINGON_STATE)) ||
164 (!occupied && (ctrl->state == ON_STATE ||
165 ctrl->state == BLINKINGOFF_STATE)))
166 pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
167
168 mutex_unlock(&ctrl->state_lock);
169 up_read(&ctrl->reset_lock);
170}
171
172static int pciehp_probe(struct pcie_device *dev)
173{
174 int rc;
175 struct controller *ctrl;
176
177
178 if (dev->service != PCIE_PORT_SERVICE_HP)
179 return -ENODEV;
180
181 if (!dev->port->subordinate) {
182
183 pci_err(dev->port,
184 "Hotplug bridge without secondary bus, ignoring\n");
185 return -ENODEV;
186 }
187
188 ctrl = pcie_init(dev);
189 if (!ctrl) {
190 pci_err(dev->port, "Controller initialization failed\n");
191 return -ENODEV;
192 }
193 set_service_data(dev, ctrl);
194
195
196 rc = init_slot(ctrl);
197 if (rc) {
198 if (rc == -EBUSY)
199 ctrl_warn(ctrl, "Slot already registered by another hotplug driver\n");
200 else
201 ctrl_err(ctrl, "Slot initialization failed (%d)\n", rc);
202 goto err_out_release_ctlr;
203 }
204
205
206 rc = pcie_init_notification(ctrl);
207 if (rc) {
208 ctrl_err(ctrl, "Notification initialization failed (%d)\n", rc);
209 goto err_out_free_ctrl_slot;
210 }
211
212
213 rc = pci_hp_add(&ctrl->hotplug_slot);
214 if (rc) {
215 ctrl_err(ctrl, "Publication to user space failed (%d)\n", rc);
216 goto err_out_shutdown_notification;
217 }
218
219 pciehp_check_presence(ctrl);
220
221 return 0;
222
223err_out_shutdown_notification:
224 pcie_shutdown_notification(ctrl);
225err_out_free_ctrl_slot:
226 cleanup_slot(ctrl);
227err_out_release_ctlr:
228 pciehp_release_ctrl(ctrl);
229 return -ENODEV;
230}
231
232static void pciehp_remove(struct pcie_device *dev)
233{
234 struct controller *ctrl = get_service_data(dev);
235
236 pci_hp_del(&ctrl->hotplug_slot);
237 pcie_shutdown_notification(ctrl);
238 cleanup_slot(ctrl);
239 pciehp_release_ctrl(ctrl);
240}
241
242#ifdef CONFIG_PM
243static bool pme_is_native(struct pcie_device *dev)
244{
245 const struct pci_host_bridge *host;
246
247 host = pci_find_host_bridge(dev->port->bus);
248 return pcie_ports_native || host->native_pme;
249}
250
251static int pciehp_suspend(struct pcie_device *dev)
252{
253
254
255
256
257 if (pme_is_native(dev))
258 pcie_disable_interrupt(get_service_data(dev));
259
260 return 0;
261}
262
263static int pciehp_resume_noirq(struct pcie_device *dev)
264{
265 struct controller *ctrl = get_service_data(dev);
266
267
268 ctrl->cmd_started = jiffies;
269 ctrl->cmd_busy = true;
270
271
272 if (ctrl->state == ON_STATE || ctrl->state == BLINKINGOFF_STATE)
273 pcie_clear_hotplug_events(ctrl);
274
275 return 0;
276}
277
278static int pciehp_resume(struct pcie_device *dev)
279{
280 struct controller *ctrl = get_service_data(dev);
281
282 if (pme_is_native(dev))
283 pcie_enable_interrupt(ctrl);
284
285 pciehp_check_presence(ctrl);
286
287 return 0;
288}
289
290static int pciehp_runtime_resume(struct pcie_device *dev)
291{
292 struct controller *ctrl = get_service_data(dev);
293
294
295 ctrl->cmd_started = jiffies;
296 ctrl->cmd_busy = true;
297
298
299 if ((ctrl->state == ON_STATE || ctrl->state == BLINKINGOFF_STATE) &&
300 pme_is_native(dev))
301 pcie_clear_hotplug_events(ctrl);
302
303 return pciehp_resume(dev);
304}
305#endif
306
307static struct pcie_port_service_driver hpdriver_portdrv = {
308 .name = "pciehp",
309 .port_type = PCIE_ANY_PORT,
310 .service = PCIE_PORT_SERVICE_HP,
311
312 .probe = pciehp_probe,
313 .remove = pciehp_remove,
314
315#ifdef CONFIG_PM
316 .suspend = pciehp_suspend,
317 .resume_noirq = pciehp_resume_noirq,
318 .resume = pciehp_resume,
319 .runtime_suspend = pciehp_suspend,
320 .runtime_resume = pciehp_runtime_resume,
321#endif
322};
323
324int __init pcie_hp_init(void)
325{
326 int retval = 0;
327
328 retval = pcie_port_service_register(&hpdriver_portdrv);
329 pr_debug("pcie_port_service_register = %d\n", retval);
330 if (retval)
331 pr_debug("Failure to register service\n");
332
333 return retval;
334}
335