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6
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9#include <linux/module.h>
10#include <linux/wait.h>
11#include <linux/bitops.h>
12#include <xen/events.h>
13#include <linux/sched.h>
14#include "pciback.h"
15
16int verbose_request;
17module_param(verbose_request, int, 0644);
18
19static irqreturn_t xen_pcibk_guest_interrupt(int irq, void *dev_id);
20
21
22
23
24
25static void xen_pcibk_control_isr(struct pci_dev *dev, int reset)
26{
27 struct xen_pcibk_dev_data *dev_data;
28 int rc;
29 int enable = 0;
30
31 dev_data = pci_get_drvdata(dev);
32 if (!dev_data)
33 return;
34
35
36 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL)
37 return;
38
39 if (reset) {
40 dev_data->enable_intx = 0;
41 dev_data->ack_intr = 0;
42 }
43 enable = dev_data->enable_intx;
44
45
46 if (!enable && !dev_data->isr_on)
47 return;
48
49
50
51
52
53 if (enable)
54 dev_data->irq = dev->irq;
55
56
57
58
59
60 if (dev_data->irq == 0)
61 goto out;
62
63 dev_dbg(&dev->dev, "%s: #%d %s %s%s %s-> %s\n",
64 dev_data->irq_name,
65 dev_data->irq,
66 pci_is_enabled(dev) ? "on" : "off",
67 dev->msi_enabled ? "MSI" : "",
68 dev->msix_enabled ? "MSI/X" : "",
69 dev_data->isr_on ? "enable" : "disable",
70 enable ? "enable" : "disable");
71
72 if (enable) {
73 rc = request_irq(dev_data->irq,
74 xen_pcibk_guest_interrupt, IRQF_SHARED,
75 dev_data->irq_name, dev);
76 if (rc) {
77 dev_err(&dev->dev, "%s: failed to install fake IRQ " \
78 "handler for IRQ %d! (rc:%d)\n",
79 dev_data->irq_name, dev_data->irq, rc);
80 goto out;
81 }
82 } else {
83 free_irq(dev_data->irq, dev);
84 dev_data->irq = 0;
85 }
86 dev_data->isr_on = enable;
87 dev_data->ack_intr = enable;
88out:
89 dev_dbg(&dev->dev, "%s: #%d %s %s%s %s\n",
90 dev_data->irq_name,
91 dev_data->irq,
92 pci_is_enabled(dev) ? "on" : "off",
93 dev->msi_enabled ? "MSI" : "",
94 dev->msix_enabled ? "MSI/X" : "",
95 enable ? (dev_data->isr_on ? "enabled" : "failed to enable") :
96 (dev_data->isr_on ? "failed to disable" : "disabled"));
97}
98
99
100
101
102
103void xen_pcibk_reset_device(struct pci_dev *dev)
104{
105 u16 cmd;
106
107 xen_pcibk_control_isr(dev, 1 );
108
109
110 if (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) {
111#ifdef CONFIG_PCI_MSI
112
113
114 if (dev->msix_enabled)
115 pci_disable_msix(dev);
116 if (dev->msi_enabled)
117 pci_disable_msi(dev);
118#endif
119 if (pci_is_enabled(dev))
120 pci_disable_device(dev);
121
122 pci_write_config_word(dev, PCI_COMMAND, 0);
123
124 dev->is_busmaster = 0;
125 } else {
126 pci_read_config_word(dev, PCI_COMMAND, &cmd);
127 if (cmd & (PCI_COMMAND_INVALIDATE)) {
128 cmd &= ~(PCI_COMMAND_INVALIDATE);
129 pci_write_config_word(dev, PCI_COMMAND, cmd);
130
131 dev->is_busmaster = 0;
132 }
133 }
134}
135
136#ifdef CONFIG_PCI_MSI
137static
138int xen_pcibk_enable_msi(struct xen_pcibk_device *pdev,
139 struct pci_dev *dev, struct xen_pci_op *op)
140{
141 struct xen_pcibk_dev_data *dev_data;
142 int status;
143
144 if (unlikely(verbose_request))
145 printk(KERN_DEBUG DRV_NAME ": %s: enable MSI\n", pci_name(dev));
146
147 status = pci_enable_msi(dev);
148
149 if (status) {
150 pr_warn_ratelimited("%s: error enabling MSI for guest %u: err %d\n",
151 pci_name(dev), pdev->xdev->otherend_id,
152 status);
153 op->value = 0;
154 return XEN_PCI_ERR_op_failed;
155 }
156
157
158
159
160 op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0;
161 if (unlikely(verbose_request))
162 printk(KERN_DEBUG DRV_NAME ": %s: MSI: %d\n", pci_name(dev),
163 op->value);
164
165 dev_data = pci_get_drvdata(dev);
166 if (dev_data)
167 dev_data->ack_intr = 0;
168
169 return 0;
170}
171
172static
173int xen_pcibk_disable_msi(struct xen_pcibk_device *pdev,
174 struct pci_dev *dev, struct xen_pci_op *op)
175{
176 struct xen_pcibk_dev_data *dev_data;
177
178 if (unlikely(verbose_request))
179 printk(KERN_DEBUG DRV_NAME ": %s: disable MSI\n",
180 pci_name(dev));
181 pci_disable_msi(dev);
182
183 op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0;
184 if (unlikely(verbose_request))
185 printk(KERN_DEBUG DRV_NAME ": %s: MSI: %d\n", pci_name(dev),
186 op->value);
187 dev_data = pci_get_drvdata(dev);
188 if (dev_data)
189 dev_data->ack_intr = 1;
190 return 0;
191}
192
193static
194int xen_pcibk_enable_msix(struct xen_pcibk_device *pdev,
195 struct pci_dev *dev, struct xen_pci_op *op)
196{
197 struct xen_pcibk_dev_data *dev_data;
198 int i, result;
199 struct msix_entry *entries;
200
201 if (unlikely(verbose_request))
202 printk(KERN_DEBUG DRV_NAME ": %s: enable MSI-X\n",
203 pci_name(dev));
204 if (op->value > SH_INFO_MAX_VEC)
205 return -EINVAL;
206
207 entries = kmalloc(op->value * sizeof(*entries), GFP_KERNEL);
208 if (entries == NULL)
209 return -ENOMEM;
210
211 for (i = 0; i < op->value; i++) {
212 entries[i].entry = op->msix_entries[i].entry;
213 entries[i].vector = op->msix_entries[i].vector;
214 }
215
216 result = pci_enable_msix(dev, entries, op->value);
217
218 if (result == 0) {
219 for (i = 0; i < op->value; i++) {
220 op->msix_entries[i].entry = entries[i].entry;
221 if (entries[i].vector)
222 op->msix_entries[i].vector =
223 xen_pirq_from_irq(entries[i].vector);
224 if (unlikely(verbose_request))
225 printk(KERN_DEBUG DRV_NAME ": %s: " \
226 "MSI-X[%d]: %d\n",
227 pci_name(dev), i,
228 op->msix_entries[i].vector);
229 }
230 } else
231 pr_warn_ratelimited("%s: error enabling MSI-X for guest %u: err %d!\n",
232 pci_name(dev), pdev->xdev->otherend_id,
233 result);
234 kfree(entries);
235
236 op->value = result;
237 dev_data = pci_get_drvdata(dev);
238 if (dev_data)
239 dev_data->ack_intr = 0;
240
241 return result > 0 ? 0 : result;
242}
243
244static
245int xen_pcibk_disable_msix(struct xen_pcibk_device *pdev,
246 struct pci_dev *dev, struct xen_pci_op *op)
247{
248 struct xen_pcibk_dev_data *dev_data;
249 if (unlikely(verbose_request))
250 printk(KERN_DEBUG DRV_NAME ": %s: disable MSI-X\n",
251 pci_name(dev));
252 pci_disable_msix(dev);
253
254
255
256
257
258 op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0;
259 if (unlikely(verbose_request))
260 printk(KERN_DEBUG DRV_NAME ": %s: MSI-X: %d\n", pci_name(dev),
261 op->value);
262 dev_data = pci_get_drvdata(dev);
263 if (dev_data)
264 dev_data->ack_intr = 1;
265 return 0;
266}
267#endif
268
269
270
271
272
273
274void xen_pcibk_test_and_schedule_op(struct xen_pcibk_device *pdev)
275{
276
277
278 if (test_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags)
279 && !test_and_set_bit(_PDEVF_op_active, &pdev->flags)) {
280 queue_work(xen_pcibk_wq, &pdev->op_work);
281 }
282
283
284 if (!test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags)
285 && test_bit(_PCIB_op_pending, &pdev->flags)) {
286 wake_up(&xen_pcibk_aer_wait_queue);
287 }
288}
289
290
291
292
293
294
295void xen_pcibk_do_op(struct work_struct *data)
296{
297 struct xen_pcibk_device *pdev =
298 container_of(data, struct xen_pcibk_device, op_work);
299 struct pci_dev *dev;
300 struct xen_pcibk_dev_data *dev_data = NULL;
301 struct xen_pci_op *op = &pdev->sh_info->op;
302 int test_intx = 0;
303
304 dev = xen_pcibk_get_pci_dev(pdev, op->domain, op->bus, op->devfn);
305
306 if (dev == NULL)
307 op->err = XEN_PCI_ERR_dev_not_found;
308 else {
309 dev_data = pci_get_drvdata(dev);
310 if (dev_data)
311 test_intx = dev_data->enable_intx;
312 switch (op->cmd) {
313 case XEN_PCI_OP_conf_read:
314 op->err = xen_pcibk_config_read(dev,
315 op->offset, op->size, &op->value);
316 break;
317 case XEN_PCI_OP_conf_write:
318 op->err = xen_pcibk_config_write(dev,
319 op->offset, op->size, op->value);
320 break;
321#ifdef CONFIG_PCI_MSI
322 case XEN_PCI_OP_enable_msi:
323 op->err = xen_pcibk_enable_msi(pdev, dev, op);
324 break;
325 case XEN_PCI_OP_disable_msi:
326 op->err = xen_pcibk_disable_msi(pdev, dev, op);
327 break;
328 case XEN_PCI_OP_enable_msix:
329 op->err = xen_pcibk_enable_msix(pdev, dev, op);
330 break;
331 case XEN_PCI_OP_disable_msix:
332 op->err = xen_pcibk_disable_msix(pdev, dev, op);
333 break;
334#endif
335 default:
336 op->err = XEN_PCI_ERR_not_implemented;
337 break;
338 }
339 }
340 if (!op->err && dev && dev_data) {
341
342 if ((dev_data->enable_intx != test_intx))
343 xen_pcibk_control_isr(dev, 0 );
344 }
345
346 wmb();
347 clear_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags);
348 notify_remote_via_irq(pdev->evtchn_irq);
349
350
351 smp_mb__before_clear_bit();
352 clear_bit(_PDEVF_op_active, &pdev->flags);
353 smp_mb__after_clear_bit();
354
355
356
357
358 xen_pcibk_test_and_schedule_op(pdev);
359}
360
361irqreturn_t xen_pcibk_handle_event(int irq, void *dev_id)
362{
363 struct xen_pcibk_device *pdev = dev_id;
364
365 xen_pcibk_test_and_schedule_op(pdev);
366
367 return IRQ_HANDLED;
368}
369static irqreturn_t xen_pcibk_guest_interrupt(int irq, void *dev_id)
370{
371 struct pci_dev *dev = (struct pci_dev *)dev_id;
372 struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
373
374 if (dev_data->isr_on && dev_data->ack_intr) {
375 dev_data->handled++;
376 if ((dev_data->handled % 1000) == 0) {
377 if (xen_test_irq_shared(irq)) {
378 pr_info("%s IRQ line is not shared "
379 "with other domains. Turning ISR off\n",
380 dev_data->irq_name);
381 dev_data->ack_intr = 0;
382 }
383 }
384 return IRQ_HANDLED;
385 }
386 return IRQ_NONE;
387}
388