17328c8f4SBjorn Helgaas // SPDX-License-Identifier: GPL-2.0
2956a9202SRyan Wilson /*
3df62ab5eSBjorn Helgaas * Xen PCI Frontend
4956a9202SRyan Wilson *
5956a9202SRyan Wilson * Author: Ryan Wilson <hap9@epoch.ncsc.mil>
6956a9202SRyan Wilson */
7956a9202SRyan Wilson #include <linux/module.h>
8956a9202SRyan Wilson #include <linux/init.h>
9956a9202SRyan Wilson #include <linux/mm.h>
10956a9202SRyan Wilson #include <xen/xenbus.h>
11956a9202SRyan Wilson #include <xen/events.h>
12956a9202SRyan Wilson #include <xen/grant_table.h>
13956a9202SRyan Wilson #include <xen/page.h>
14956a9202SRyan Wilson #include <linux/spinlock.h>
15956a9202SRyan Wilson #include <linux/pci.h>
16956a9202SRyan Wilson #include <linux/msi.h>
17956a9202SRyan Wilson #include <xen/interface/io/pciif.h>
18956a9202SRyan Wilson #include <asm/xen/pci.h>
19956a9202SRyan Wilson #include <linux/interrupt.h>
2060063497SArun Sharma #include <linux/atomic.h>
21956a9202SRyan Wilson #include <linux/workqueue.h>
22956a9202SRyan Wilson #include <linux/bitops.h>
23956a9202SRyan Wilson #include <linux/time.h>
24e1d5bbcdSTina Ruchandani #include <linux/ktime.h>
2551c71a3bSKonrad Rzeszutek Wilk #include <xen/platform_pci.h>
26956a9202SRyan Wilson
273d925320SKonrad Rzeszutek Wilk #include <asm/xen/swiotlb-xen.h>
28bce21a2bSJan Beulich
29956a9202SRyan Wilson #define INVALID_EVTCHN (-1)
30956a9202SRyan Wilson
31956a9202SRyan Wilson struct pci_bus_entry {
32956a9202SRyan Wilson struct list_head list;
33956a9202SRyan Wilson struct pci_bus *bus;
34956a9202SRyan Wilson };
35956a9202SRyan Wilson
36956a9202SRyan Wilson #define _PDEVB_op_active (0)
37956a9202SRyan Wilson #define PDEVB_op_active (1 << (_PDEVB_op_active))
38956a9202SRyan Wilson
39956a9202SRyan Wilson struct pcifront_device {
40956a9202SRyan Wilson struct xenbus_device *xdev;
41956a9202SRyan Wilson struct list_head root_buses;
42956a9202SRyan Wilson
43956a9202SRyan Wilson int evtchn;
44bce21a2bSJan Beulich grant_ref_t gnt_ref;
45956a9202SRyan Wilson
46956a9202SRyan Wilson int irq;
47956a9202SRyan Wilson
48956a9202SRyan Wilson /* Lock this when doing any operations in sh_info */
49956a9202SRyan Wilson spinlock_t sh_info_lock;
50956a9202SRyan Wilson struct xen_pci_sharedinfo *sh_info;
51956a9202SRyan Wilson struct work_struct op_work;
52956a9202SRyan Wilson unsigned long flags;
53956a9202SRyan Wilson
54956a9202SRyan Wilson };
55956a9202SRyan Wilson
56956a9202SRyan Wilson struct pcifront_sd {
574d8c8bd6SKonrad Rzeszutek Wilk struct pci_sysdata sd;
58956a9202SRyan Wilson struct pcifront_device *pdev;
59956a9202SRyan Wilson };
60956a9202SRyan Wilson
61956a9202SRyan Wilson static inline struct pcifront_device *
pcifront_get_pdev(struct pcifront_sd * sd)62956a9202SRyan Wilson pcifront_get_pdev(struct pcifront_sd *sd)
63956a9202SRyan Wilson {
64956a9202SRyan Wilson return sd->pdev;
65956a9202SRyan Wilson }
66956a9202SRyan Wilson
pcifront_init_sd(struct pcifront_sd * sd,unsigned int domain,unsigned int bus,struct pcifront_device * pdev)67956a9202SRyan Wilson static inline void pcifront_init_sd(struct pcifront_sd *sd,
68956a9202SRyan Wilson unsigned int domain, unsigned int bus,
69956a9202SRyan Wilson struct pcifront_device *pdev)
70956a9202SRyan Wilson {
714d8c8bd6SKonrad Rzeszutek Wilk /* Because we do not expose that information via XenBus. */
724d8c8bd6SKonrad Rzeszutek Wilk sd->sd.node = first_online_node;
734d8c8bd6SKonrad Rzeszutek Wilk sd->sd.domain = domain;
74956a9202SRyan Wilson sd->pdev = pdev;
75956a9202SRyan Wilson }
76956a9202SRyan Wilson
77956a9202SRyan Wilson static DEFINE_SPINLOCK(pcifront_dev_lock);
78956a9202SRyan Wilson static struct pcifront_device *pcifront_dev;
79956a9202SRyan Wilson
errno_to_pcibios_err(int errno)80956a9202SRyan Wilson static int errno_to_pcibios_err(int errno)
81956a9202SRyan Wilson {
82956a9202SRyan Wilson switch (errno) {
83956a9202SRyan Wilson case XEN_PCI_ERR_success:
84956a9202SRyan Wilson return PCIBIOS_SUCCESSFUL;
85956a9202SRyan Wilson
86956a9202SRyan Wilson case XEN_PCI_ERR_dev_not_found:
87956a9202SRyan Wilson return PCIBIOS_DEVICE_NOT_FOUND;
88956a9202SRyan Wilson
89956a9202SRyan Wilson case XEN_PCI_ERR_invalid_offset:
90956a9202SRyan Wilson case XEN_PCI_ERR_op_failed:
91956a9202SRyan Wilson return PCIBIOS_BAD_REGISTER_NUMBER;
92956a9202SRyan Wilson
93956a9202SRyan Wilson case XEN_PCI_ERR_not_implemented:
94956a9202SRyan Wilson return PCIBIOS_FUNC_NOT_SUPPORTED;
95956a9202SRyan Wilson
96956a9202SRyan Wilson case XEN_PCI_ERR_access_denied:
97956a9202SRyan Wilson return PCIBIOS_SET_FAILED;
98956a9202SRyan Wilson }
99956a9202SRyan Wilson return errno;
100956a9202SRyan Wilson }
101956a9202SRyan Wilson
schedule_pcifront_aer_op(struct pcifront_device * pdev)102956a9202SRyan Wilson static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev)
103956a9202SRyan Wilson {
104956a9202SRyan Wilson if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags)
105956a9202SRyan Wilson && !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) {
106956a9202SRyan Wilson dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n");
107956a9202SRyan Wilson schedule_work(&pdev->op_work);
108956a9202SRyan Wilson }
109956a9202SRyan Wilson }
110956a9202SRyan Wilson
do_pci_op(struct pcifront_device * pdev,struct xen_pci_op * op)111956a9202SRyan Wilson static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op)
112956a9202SRyan Wilson {
113956a9202SRyan Wilson int err = 0;
114956a9202SRyan Wilson struct xen_pci_op *active_op = &pdev->sh_info->op;
115956a9202SRyan Wilson unsigned long irq_flags;
116956a9202SRyan Wilson evtchn_port_t port = pdev->evtchn;
117f956c1b0SSergio Miguéns Iglesias unsigned int irq = pdev->irq;
118956a9202SRyan Wilson s64 ns, ns_timeout;
119956a9202SRyan Wilson
120956a9202SRyan Wilson spin_lock_irqsave(&pdev->sh_info_lock, irq_flags);
121956a9202SRyan Wilson
122956a9202SRyan Wilson memcpy(active_op, op, sizeof(struct xen_pci_op));
123956a9202SRyan Wilson
124956a9202SRyan Wilson /* Go */
125956a9202SRyan Wilson wmb();
126956a9202SRyan Wilson set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags);
127956a9202SRyan Wilson notify_remote_via_evtchn(port);
128956a9202SRyan Wilson
129956a9202SRyan Wilson /*
130956a9202SRyan Wilson * We set a poll timeout of 3 seconds but give up on return after
131956a9202SRyan Wilson * 2 seconds. It is better to time out too late rather than too early
132956a9202SRyan Wilson * (in the latter case we end up continually re-executing poll() with a
133956a9202SRyan Wilson * timeout in the past). 1s difference gives plenty of slack for error.
134956a9202SRyan Wilson */
135e1d5bbcdSTina Ruchandani ns_timeout = ktime_get_ns() + 2 * (s64)NSEC_PER_SEC;
136956a9202SRyan Wilson
137956a9202SRyan Wilson xen_clear_irq_pending(irq);
138956a9202SRyan Wilson
139956a9202SRyan Wilson while (test_bit(_XEN_PCIF_active,
140956a9202SRyan Wilson (unsigned long *)&pdev->sh_info->flags)) {
141956a9202SRyan Wilson xen_poll_irq_timeout(irq, jiffies + 3*HZ);
142956a9202SRyan Wilson xen_clear_irq_pending(irq);
143e1d5bbcdSTina Ruchandani ns = ktime_get_ns();
144956a9202SRyan Wilson if (ns > ns_timeout) {
145956a9202SRyan Wilson dev_err(&pdev->xdev->dev,
146956a9202SRyan Wilson "pciback not responding!!!\n");
147956a9202SRyan Wilson clear_bit(_XEN_PCIF_active,
148956a9202SRyan Wilson (unsigned long *)&pdev->sh_info->flags);
149956a9202SRyan Wilson err = XEN_PCI_ERR_dev_not_found;
150956a9202SRyan Wilson goto out;
151956a9202SRyan Wilson }
152956a9202SRyan Wilson }
153956a9202SRyan Wilson
154956a9202SRyan Wilson /*
155956a9202SRyan Wilson * We might lose backend service request since we
156956a9202SRyan Wilson * reuse same evtchn with pci_conf backend response. So re-schedule
157956a9202SRyan Wilson * aer pcifront service.
158956a9202SRyan Wilson */
159956a9202SRyan Wilson if (test_bit(_XEN_PCIB_active,
160956a9202SRyan Wilson (unsigned long *)&pdev->sh_info->flags)) {
161956a9202SRyan Wilson dev_err(&pdev->xdev->dev,
162956a9202SRyan Wilson "schedule aer pcifront service\n");
163956a9202SRyan Wilson schedule_pcifront_aer_op(pdev);
164956a9202SRyan Wilson }
165956a9202SRyan Wilson
166956a9202SRyan Wilson memcpy(op, active_op, sizeof(struct xen_pci_op));
167956a9202SRyan Wilson
168956a9202SRyan Wilson err = op->err;
169956a9202SRyan Wilson out:
170956a9202SRyan Wilson spin_unlock_irqrestore(&pdev->sh_info_lock, irq_flags);
171956a9202SRyan Wilson return err;
172956a9202SRyan Wilson }
173956a9202SRyan Wilson
174956a9202SRyan Wilson /* Access to this function is spinlocked in drivers/pci/access.c */
pcifront_bus_read(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * val)175956a9202SRyan Wilson static int pcifront_bus_read(struct pci_bus *bus, unsigned int devfn,
176956a9202SRyan Wilson int where, int size, u32 *val)
177956a9202SRyan Wilson {
178956a9202SRyan Wilson int err = 0;
179956a9202SRyan Wilson struct xen_pci_op op = {
180956a9202SRyan Wilson .cmd = XEN_PCI_OP_conf_read,
181956a9202SRyan Wilson .domain = pci_domain_nr(bus),
182956a9202SRyan Wilson .bus = bus->number,
183956a9202SRyan Wilson .devfn = devfn,
184956a9202SRyan Wilson .offset = where,
185956a9202SRyan Wilson .size = size,
186956a9202SRyan Wilson };
187956a9202SRyan Wilson struct pcifront_sd *sd = bus->sysdata;
188956a9202SRyan Wilson struct pcifront_device *pdev = pcifront_get_pdev(sd);
189956a9202SRyan Wilson
1904969a3a2SBoris Ostrovsky dev_dbg(&pdev->xdev->dev,
191e4de866aSKonrad Rzeszutek Wilk "read dev=%04x:%02x:%02x.%d - offset %x size %d\n",
192956a9202SRyan Wilson pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
193956a9202SRyan Wilson PCI_FUNC(devfn), where, size);
194956a9202SRyan Wilson
195956a9202SRyan Wilson err = do_pci_op(pdev, &op);
196956a9202SRyan Wilson
197956a9202SRyan Wilson if (likely(!err)) {
1984969a3a2SBoris Ostrovsky dev_dbg(&pdev->xdev->dev, "read got back value %x\n",
199956a9202SRyan Wilson op.value);
200956a9202SRyan Wilson
201956a9202SRyan Wilson *val = op.value;
202956a9202SRyan Wilson } else if (err == -ENODEV) {
203956a9202SRyan Wilson /* No device here, pretend that it just returned 0 */
204956a9202SRyan Wilson err = 0;
205956a9202SRyan Wilson *val = 0;
206956a9202SRyan Wilson }
207956a9202SRyan Wilson
208956a9202SRyan Wilson return errno_to_pcibios_err(err);
209956a9202SRyan Wilson }
210956a9202SRyan Wilson
211956a9202SRyan Wilson /* Access to this function is spinlocked in drivers/pci/access.c */
pcifront_bus_write(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 val)212956a9202SRyan Wilson static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn,
213956a9202SRyan Wilson int where, int size, u32 val)
214956a9202SRyan Wilson {
215956a9202SRyan Wilson struct xen_pci_op op = {
216956a9202SRyan Wilson .cmd = XEN_PCI_OP_conf_write,
217956a9202SRyan Wilson .domain = pci_domain_nr(bus),
218956a9202SRyan Wilson .bus = bus->number,
219956a9202SRyan Wilson .devfn = devfn,
220956a9202SRyan Wilson .offset = where,
221956a9202SRyan Wilson .size = size,
222956a9202SRyan Wilson .value = val,
223956a9202SRyan Wilson };
224956a9202SRyan Wilson struct pcifront_sd *sd = bus->sysdata;
225956a9202SRyan Wilson struct pcifront_device *pdev = pcifront_get_pdev(sd);
226956a9202SRyan Wilson
2274969a3a2SBoris Ostrovsky dev_dbg(&pdev->xdev->dev,
2284969a3a2SBoris Ostrovsky "write dev=%04x:%02x:%02x.%d - offset %x size %d val %x\n",
229956a9202SRyan Wilson pci_domain_nr(bus), bus->number,
230956a9202SRyan Wilson PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val);
231956a9202SRyan Wilson
232956a9202SRyan Wilson return errno_to_pcibios_err(do_pci_op(pdev, &op));
233956a9202SRyan Wilson }
234956a9202SRyan Wilson
235b8b0f559SKonrad Rzeszutek Wilk static struct pci_ops pcifront_bus_ops = {
236956a9202SRyan Wilson .read = pcifront_bus_read,
237956a9202SRyan Wilson .write = pcifront_bus_write,
238956a9202SRyan Wilson };
239956a9202SRyan Wilson
240956a9202SRyan Wilson #ifdef CONFIG_PCI_MSI
pci_frontend_enable_msix(struct pci_dev * dev,int vector[],int nvec)241956a9202SRyan Wilson static int pci_frontend_enable_msix(struct pci_dev *dev,
242cc0f89c4SKonrad Rzeszutek Wilk int vector[], int nvec)
243956a9202SRyan Wilson {
244956a9202SRyan Wilson int err;
245956a9202SRyan Wilson int i;
246956a9202SRyan Wilson struct xen_pci_op op = {
247956a9202SRyan Wilson .cmd = XEN_PCI_OP_enable_msix,
248956a9202SRyan Wilson .domain = pci_domain_nr(dev->bus),
249956a9202SRyan Wilson .bus = dev->bus->number,
250956a9202SRyan Wilson .devfn = dev->devfn,
251956a9202SRyan Wilson .value = nvec,
252956a9202SRyan Wilson };
253956a9202SRyan Wilson struct pcifront_sd *sd = dev->bus->sysdata;
254956a9202SRyan Wilson struct pcifront_device *pdev = pcifront_get_pdev(sd);
255956a9202SRyan Wilson struct msi_desc *entry;
256956a9202SRyan Wilson
257956a9202SRyan Wilson if (nvec > SH_INFO_MAX_VEC) {
2587506dc79SFrederick Lawler pci_err(dev, "too many vectors (0x%x) for PCI frontend:"
2597506dc79SFrederick Lawler " Increase SH_INFO_MAX_VEC\n", nvec);
260956a9202SRyan Wilson return -EINVAL;
261956a9202SRyan Wilson }
262956a9202SRyan Wilson
263956a9202SRyan Wilson i = 0;
2643d31bbd3SThomas Gleixner msi_for_each_desc(entry, &dev->dev, MSI_DESC_NOTASSOCIATED) {
265173ffad7SThomas Gleixner op.msix_entries[i].entry = entry->msi_index;
266956a9202SRyan Wilson /* Vector is useless at this point. */
267956a9202SRyan Wilson op.msix_entries[i].vector = -1;
268956a9202SRyan Wilson i++;
269956a9202SRyan Wilson }
270956a9202SRyan Wilson
271956a9202SRyan Wilson err = do_pci_op(pdev, &op);
272956a9202SRyan Wilson
273956a9202SRyan Wilson if (likely(!err)) {
274956a9202SRyan Wilson if (likely(!op.value)) {
275956a9202SRyan Wilson /* we get the result */
2761d461052SKonrad Rzeszutek Wilk for (i = 0; i < nvec; i++) {
2771d461052SKonrad Rzeszutek Wilk if (op.msix_entries[i].vector <= 0) {
2787506dc79SFrederick Lawler pci_warn(dev, "MSI-X entry %d is invalid: %d!\n",
2791d461052SKonrad Rzeszutek Wilk i, op.msix_entries[i].vector);
2801d461052SKonrad Rzeszutek Wilk err = -EINVAL;
281cc0f89c4SKonrad Rzeszutek Wilk vector[i] = -1;
2821d461052SKonrad Rzeszutek Wilk continue;
2831d461052SKonrad Rzeszutek Wilk }
284cc0f89c4SKonrad Rzeszutek Wilk vector[i] = op.msix_entries[i].vector;
2851d461052SKonrad Rzeszutek Wilk }
286956a9202SRyan Wilson } else {
28734c6b710SMohan Kumar pr_info("enable msix get value %x\n", op.value);
288f09d8432SJan Beulich err = op.value;
289956a9202SRyan Wilson }
290956a9202SRyan Wilson } else {
2917506dc79SFrederick Lawler pci_err(dev, "enable msix get err %x\n", err);
292956a9202SRyan Wilson }
2931d461052SKonrad Rzeszutek Wilk return err;
294956a9202SRyan Wilson }
295956a9202SRyan Wilson
pci_frontend_disable_msix(struct pci_dev * dev)296956a9202SRyan Wilson static void pci_frontend_disable_msix(struct pci_dev *dev)
297956a9202SRyan Wilson {
298956a9202SRyan Wilson int err;
299956a9202SRyan Wilson struct xen_pci_op op = {
300956a9202SRyan Wilson .cmd = XEN_PCI_OP_disable_msix,
301956a9202SRyan Wilson .domain = pci_domain_nr(dev->bus),
302956a9202SRyan Wilson .bus = dev->bus->number,
303956a9202SRyan Wilson .devfn = dev->devfn,
304956a9202SRyan Wilson };
305956a9202SRyan Wilson struct pcifront_sd *sd = dev->bus->sysdata;
306956a9202SRyan Wilson struct pcifront_device *pdev = pcifront_get_pdev(sd);
307956a9202SRyan Wilson
308956a9202SRyan Wilson err = do_pci_op(pdev, &op);
309956a9202SRyan Wilson
310956a9202SRyan Wilson /* What should do for error ? */
311956a9202SRyan Wilson if (err)
3127506dc79SFrederick Lawler pci_err(dev, "pci_disable_msix get err %x\n", err);
313956a9202SRyan Wilson }
314956a9202SRyan Wilson
pci_frontend_enable_msi(struct pci_dev * dev,int vector[])315cc0f89c4SKonrad Rzeszutek Wilk static int pci_frontend_enable_msi(struct pci_dev *dev, int vector[])
316956a9202SRyan Wilson {
317956a9202SRyan Wilson int err;
318956a9202SRyan Wilson struct xen_pci_op op = {
319956a9202SRyan Wilson .cmd = XEN_PCI_OP_enable_msi,
320956a9202SRyan Wilson .domain = pci_domain_nr(dev->bus),
321956a9202SRyan Wilson .bus = dev->bus->number,
322956a9202SRyan Wilson .devfn = dev->devfn,
323956a9202SRyan Wilson };
324956a9202SRyan Wilson struct pcifront_sd *sd = dev->bus->sysdata;
325956a9202SRyan Wilson struct pcifront_device *pdev = pcifront_get_pdev(sd);
326956a9202SRyan Wilson
327956a9202SRyan Wilson err = do_pci_op(pdev, &op);
328956a9202SRyan Wilson if (likely(!err)) {
329cc0f89c4SKonrad Rzeszutek Wilk vector[0] = op.value;
3301d461052SKonrad Rzeszutek Wilk if (op.value <= 0) {
3317506dc79SFrederick Lawler pci_warn(dev, "MSI entry is invalid: %d!\n",
3321d461052SKonrad Rzeszutek Wilk op.value);
3331d461052SKonrad Rzeszutek Wilk err = -EINVAL;
334cc0f89c4SKonrad Rzeszutek Wilk vector[0] = -1;
3351d461052SKonrad Rzeszutek Wilk }
336956a9202SRyan Wilson } else {
3377506dc79SFrederick Lawler pci_err(dev, "pci frontend enable msi failed for dev "
338956a9202SRyan Wilson "%x:%x\n", op.bus, op.devfn);
339956a9202SRyan Wilson err = -EINVAL;
340956a9202SRyan Wilson }
341956a9202SRyan Wilson return err;
342956a9202SRyan Wilson }
343956a9202SRyan Wilson
pci_frontend_disable_msi(struct pci_dev * dev)344956a9202SRyan Wilson static void pci_frontend_disable_msi(struct pci_dev *dev)
345956a9202SRyan Wilson {
346956a9202SRyan Wilson int err;
347956a9202SRyan Wilson struct xen_pci_op op = {
348956a9202SRyan Wilson .cmd = XEN_PCI_OP_disable_msi,
349956a9202SRyan Wilson .domain = pci_domain_nr(dev->bus),
350956a9202SRyan Wilson .bus = dev->bus->number,
351956a9202SRyan Wilson .devfn = dev->devfn,
352956a9202SRyan Wilson };
353956a9202SRyan Wilson struct pcifront_sd *sd = dev->bus->sysdata;
354956a9202SRyan Wilson struct pcifront_device *pdev = pcifront_get_pdev(sd);
355956a9202SRyan Wilson
356956a9202SRyan Wilson err = do_pci_op(pdev, &op);
357956a9202SRyan Wilson if (err == XEN_PCI_ERR_dev_not_found) {
358956a9202SRyan Wilson /* XXX No response from backend, what shall we do? */
35934c6b710SMohan Kumar pr_info("get no response from backend for disable MSI\n");
360956a9202SRyan Wilson return;
361956a9202SRyan Wilson }
362956a9202SRyan Wilson if (err)
363956a9202SRyan Wilson /* how can pciback notify us fail? */
36434c6b710SMohan Kumar pr_info("get fake response from backend\n");
365956a9202SRyan Wilson }
366956a9202SRyan Wilson
367956a9202SRyan Wilson static struct xen_pci_frontend_ops pci_frontend_ops = {
368956a9202SRyan Wilson .enable_msi = pci_frontend_enable_msi,
369956a9202SRyan Wilson .disable_msi = pci_frontend_disable_msi,
370956a9202SRyan Wilson .enable_msix = pci_frontend_enable_msix,
371956a9202SRyan Wilson .disable_msix = pci_frontend_disable_msix,
372956a9202SRyan Wilson };
373956a9202SRyan Wilson
pci_frontend_registrar(int enable)374956a9202SRyan Wilson static void pci_frontend_registrar(int enable)
375956a9202SRyan Wilson {
376956a9202SRyan Wilson if (enable)
377956a9202SRyan Wilson xen_pci_frontend = &pci_frontend_ops;
378956a9202SRyan Wilson else
379956a9202SRyan Wilson xen_pci_frontend = NULL;
380956a9202SRyan Wilson };
381956a9202SRyan Wilson #else
pci_frontend_registrar(int enable)382956a9202SRyan Wilson static inline void pci_frontend_registrar(int enable) { };
383956a9202SRyan Wilson #endif /* CONFIG_PCI_MSI */
384956a9202SRyan Wilson
385956a9202SRyan Wilson /* Claim resources for the PCI frontend as-is, backend won't allow changes */
pcifront_claim_resource(struct pci_dev * dev,void * data)386956a9202SRyan Wilson static int pcifront_claim_resource(struct pci_dev *dev, void *data)
387956a9202SRyan Wilson {
388956a9202SRyan Wilson struct pcifront_device *pdev = data;
389956a9202SRyan Wilson int i;
390956a9202SRyan Wilson struct resource *r;
391956a9202SRyan Wilson
392*09cc9006SMika Westerberg pci_dev_for_each_resource(dev, r, i) {
393956a9202SRyan Wilson if (!r->parent && r->start && r->flags) {
394956a9202SRyan Wilson dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n",
395956a9202SRyan Wilson pci_name(dev), i);
396956a9202SRyan Wilson if (pci_claim_resource(dev, i)) {
397917e3e65SKonrad Rzeszutek Wilk dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! "
398917e3e65SKonrad Rzeszutek Wilk "Device offline. Try using e820_host=1 in the guest config.\n",
399956a9202SRyan Wilson pci_name(dev), i);
400956a9202SRyan Wilson }
401956a9202SRyan Wilson }
402956a9202SRyan Wilson }
403956a9202SRyan Wilson
404956a9202SRyan Wilson return 0;
405956a9202SRyan Wilson }
406956a9202SRyan Wilson
pcifront_scan_bus(struct pcifront_device * pdev,unsigned int domain,unsigned int bus,struct pci_bus * b)40715856ad5SBill Pemberton static int pcifront_scan_bus(struct pcifront_device *pdev,
408956a9202SRyan Wilson unsigned int domain, unsigned int bus,
409956a9202SRyan Wilson struct pci_bus *b)
410956a9202SRyan Wilson {
411956a9202SRyan Wilson struct pci_dev *d;
412956a9202SRyan Wilson unsigned int devfn;
413956a9202SRyan Wilson
414f956c1b0SSergio Miguéns Iglesias /*
415f956c1b0SSergio Miguéns Iglesias * Scan the bus for functions and add.
416956a9202SRyan Wilson * We omit handling of PCI bridge attachment because pciback prevents
417956a9202SRyan Wilson * bridges from being exported.
418956a9202SRyan Wilson */
419956a9202SRyan Wilson for (devfn = 0; devfn < 0x100; devfn++) {
420956a9202SRyan Wilson d = pci_get_slot(b, devfn);
421956a9202SRyan Wilson if (d) {
422956a9202SRyan Wilson /* Device is already known. */
423956a9202SRyan Wilson pci_dev_put(d);
424956a9202SRyan Wilson continue;
425956a9202SRyan Wilson }
426956a9202SRyan Wilson
427956a9202SRyan Wilson d = pci_scan_single_device(b, devfn);
428956a9202SRyan Wilson if (d)
429956a9202SRyan Wilson dev_info(&pdev->xdev->dev, "New device on "
430e4de866aSKonrad Rzeszutek Wilk "%04x:%02x:%02x.%d found.\n", domain, bus,
431956a9202SRyan Wilson PCI_SLOT(devfn), PCI_FUNC(devfn));
432956a9202SRyan Wilson }
433956a9202SRyan Wilson
434956a9202SRyan Wilson return 0;
435956a9202SRyan Wilson }
436956a9202SRyan Wilson
pcifront_scan_root(struct pcifront_device * pdev,unsigned int domain,unsigned int bus)43715856ad5SBill Pemberton static int pcifront_scan_root(struct pcifront_device *pdev,
438956a9202SRyan Wilson unsigned int domain, unsigned int bus)
439956a9202SRyan Wilson {
440956a9202SRyan Wilson struct pci_bus *b;
441515d425bSArnd Bergmann LIST_HEAD(resources);
442956a9202SRyan Wilson struct pcifront_sd *sd = NULL;
443956a9202SRyan Wilson struct pci_bus_entry *bus_entry = NULL;
444956a9202SRyan Wilson int err = 0;
445515d425bSArnd Bergmann static struct resource busn_res = {
446515d425bSArnd Bergmann .start = 0,
447515d425bSArnd Bergmann .end = 255,
448515d425bSArnd Bergmann .flags = IORESOURCE_BUS,
449515d425bSArnd Bergmann };
450956a9202SRyan Wilson
451956a9202SRyan Wilson #ifndef CONFIG_PCI_DOMAINS
452956a9202SRyan Wilson if (domain != 0) {
453956a9202SRyan Wilson dev_err(&pdev->xdev->dev,
454956a9202SRyan Wilson "PCI Root in non-zero PCI Domain! domain=%d\n", domain);
455956a9202SRyan Wilson dev_err(&pdev->xdev->dev,
456956a9202SRyan Wilson "Please compile with CONFIG_PCI_DOMAINS\n");
457956a9202SRyan Wilson err = -EINVAL;
458956a9202SRyan Wilson goto err_out;
459956a9202SRyan Wilson }
460956a9202SRyan Wilson #endif
461956a9202SRyan Wilson
462956a9202SRyan Wilson dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n",
463956a9202SRyan Wilson domain, bus);
464956a9202SRyan Wilson
4654d8c8bd6SKonrad Rzeszutek Wilk bus_entry = kzalloc(sizeof(*bus_entry), GFP_KERNEL);
4664d8c8bd6SKonrad Rzeszutek Wilk sd = kzalloc(sizeof(*sd), GFP_KERNEL);
467956a9202SRyan Wilson if (!bus_entry || !sd) {
468956a9202SRyan Wilson err = -ENOMEM;
469956a9202SRyan Wilson goto err_out;
470956a9202SRyan Wilson }
471515d425bSArnd Bergmann pci_add_resource(&resources, &ioport_resource);
472515d425bSArnd Bergmann pci_add_resource(&resources, &iomem_resource);
473515d425bSArnd Bergmann pci_add_resource(&resources, &busn_res);
474956a9202SRyan Wilson pcifront_init_sd(sd, domain, bus, pdev);
475956a9202SRyan Wilson
476a83919e0SRafael J. Wysocki pci_lock_rescan_remove();
477a83919e0SRafael J. Wysocki
478515d425bSArnd Bergmann b = pci_scan_root_bus(&pdev->xdev->dev, bus,
479515d425bSArnd Bergmann &pcifront_bus_ops, sd, &resources);
480956a9202SRyan Wilson if (!b) {
481956a9202SRyan Wilson dev_err(&pdev->xdev->dev,
482956a9202SRyan Wilson "Error creating PCI Frontend Bus!\n");
483956a9202SRyan Wilson err = -ENOMEM;
484a83919e0SRafael J. Wysocki pci_unlock_rescan_remove();
485515d425bSArnd Bergmann pci_free_resource_list(&resources);
486956a9202SRyan Wilson goto err_out;
487956a9202SRyan Wilson }
488956a9202SRyan Wilson
489956a9202SRyan Wilson bus_entry->bus = b;
490956a9202SRyan Wilson
491956a9202SRyan Wilson list_add(&bus_entry->list, &pdev->root_buses);
492956a9202SRyan Wilson
493f956c1b0SSergio Miguéns Iglesias /*
494f956c1b0SSergio Miguéns Iglesias * pci_scan_root_bus skips devices which do not have a
495f956c1b0SSergio Miguéns Iglesias * devfn==0. The pcifront_scan_bus enumerates all devfn.
496f956c1b0SSergio Miguéns Iglesias */
497956a9202SRyan Wilson err = pcifront_scan_bus(pdev, domain, bus, b);
498956a9202SRyan Wilson
499956a9202SRyan Wilson /* Claim resources before going "live" with our devices */
500956a9202SRyan Wilson pci_walk_bus(b, pcifront_claim_resource, pdev);
501956a9202SRyan Wilson
502956a9202SRyan Wilson /* Create SysFS and notify udev of the devices. Aka: "going live" */
503956a9202SRyan Wilson pci_bus_add_devices(b);
504956a9202SRyan Wilson
505a83919e0SRafael J. Wysocki pci_unlock_rescan_remove();
506956a9202SRyan Wilson return err;
507956a9202SRyan Wilson
508956a9202SRyan Wilson err_out:
509956a9202SRyan Wilson kfree(bus_entry);
510956a9202SRyan Wilson kfree(sd);
511956a9202SRyan Wilson
512956a9202SRyan Wilson return err;
513956a9202SRyan Wilson }
514956a9202SRyan Wilson
pcifront_rescan_root(struct pcifront_device * pdev,unsigned int domain,unsigned int bus)51515856ad5SBill Pemberton static int pcifront_rescan_root(struct pcifront_device *pdev,
516956a9202SRyan Wilson unsigned int domain, unsigned int bus)
517956a9202SRyan Wilson {
518956a9202SRyan Wilson int err;
519956a9202SRyan Wilson struct pci_bus *b;
520956a9202SRyan Wilson
521956a9202SRyan Wilson b = pci_find_bus(domain, bus);
522956a9202SRyan Wilson if (!b)
523956a9202SRyan Wilson /* If the bus is unknown, create it. */
524956a9202SRyan Wilson return pcifront_scan_root(pdev, domain, bus);
525956a9202SRyan Wilson
5262849752fSJuergen Gross dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n",
5272849752fSJuergen Gross domain, bus);
5282849752fSJuergen Gross
529956a9202SRyan Wilson err = pcifront_scan_bus(pdev, domain, bus, b);
530956a9202SRyan Wilson
531956a9202SRyan Wilson /* Claim resources before going "live" with our devices */
532956a9202SRyan Wilson pci_walk_bus(b, pcifront_claim_resource, pdev);
533956a9202SRyan Wilson
534956a9202SRyan Wilson /* Create SysFS and notify udev of the devices. Aka: "going live" */
535956a9202SRyan Wilson pci_bus_add_devices(b);
536956a9202SRyan Wilson
537956a9202SRyan Wilson return err;
538956a9202SRyan Wilson }
539956a9202SRyan Wilson
free_root_bus_devs(struct pci_bus * bus)540956a9202SRyan Wilson static void free_root_bus_devs(struct pci_bus *bus)
541956a9202SRyan Wilson {
542956a9202SRyan Wilson struct pci_dev *dev;
543956a9202SRyan Wilson
544956a9202SRyan Wilson while (!list_empty(&bus->devices)) {
545956a9202SRyan Wilson dev = container_of(bus->devices.next, struct pci_dev,
546956a9202SRyan Wilson bus_list);
5477506dc79SFrederick Lawler pci_dbg(dev, "removing device\n");
548210647afSYinghai Lu pci_stop_and_remove_bus_device(dev);
549956a9202SRyan Wilson }
550956a9202SRyan Wilson }
551956a9202SRyan Wilson
pcifront_free_roots(struct pcifront_device * pdev)552956a9202SRyan Wilson static void pcifront_free_roots(struct pcifront_device *pdev)
553956a9202SRyan Wilson {
554956a9202SRyan Wilson struct pci_bus_entry *bus_entry, *t;
555956a9202SRyan Wilson
556956a9202SRyan Wilson dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n");
557956a9202SRyan Wilson
558a83919e0SRafael J. Wysocki pci_lock_rescan_remove();
559956a9202SRyan Wilson list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) {
560956a9202SRyan Wilson list_del(&bus_entry->list);
561956a9202SRyan Wilson
562956a9202SRyan Wilson free_root_bus_devs(bus_entry->bus);
563956a9202SRyan Wilson
564956a9202SRyan Wilson kfree(bus_entry->bus->sysdata);
565956a9202SRyan Wilson
566956a9202SRyan Wilson device_unregister(bus_entry->bus->bridge);
567956a9202SRyan Wilson pci_remove_bus(bus_entry->bus);
568956a9202SRyan Wilson
569956a9202SRyan Wilson kfree(bus_entry);
570956a9202SRyan Wilson }
571a83919e0SRafael J. Wysocki pci_unlock_rescan_remove();
572956a9202SRyan Wilson }
573956a9202SRyan Wilson
pcifront_common_process(int cmd,struct pcifront_device * pdev,pci_channel_state_t state)574956a9202SRyan Wilson static pci_ers_result_t pcifront_common_process(int cmd,
575956a9202SRyan Wilson struct pcifront_device *pdev,
576956a9202SRyan Wilson pci_channel_state_t state)
577956a9202SRyan Wilson {
578956a9202SRyan Wilson struct pci_driver *pdrv;
579956a9202SRyan Wilson int bus = pdev->sh_info->aer_op.bus;
580956a9202SRyan Wilson int devfn = pdev->sh_info->aer_op.devfn;
581dd34bb40SSinan Kaya int domain = pdev->sh_info->aer_op.domain;
582956a9202SRyan Wilson struct pci_dev *pcidev;
583956a9202SRyan Wilson
584956a9202SRyan Wilson dev_dbg(&pdev->xdev->dev,
585956a9202SRyan Wilson "pcifront AER process: cmd %x (bus:%x, devfn%x)",
586956a9202SRyan Wilson cmd, bus, devfn);
587956a9202SRyan Wilson
588dd34bb40SSinan Kaya pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn);
58943e85554SUwe Kleine-König if (!pcidev || !pcidev->dev.driver) {
5902a63dd72SJiri Slaby dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n");
5912a63dd72SJiri Slaby pci_dev_put(pcidev);
59234ab316dSUwe Kleine-König return PCI_ERS_RESULT_NONE;
593956a9202SRyan Wilson }
59443e85554SUwe Kleine-König pdrv = to_pci_driver(pcidev->dev.driver);
595956a9202SRyan Wilson
596956a9202SRyan Wilson if (pdrv->err_handler && pdrv->err_handler->error_detected) {
5977506dc79SFrederick Lawler pci_dbg(pcidev, "trying to call AER service\n");
598956a9202SRyan Wilson switch (cmd) {
599956a9202SRyan Wilson case XEN_PCI_OP_aer_detected:
60034ab316dSUwe Kleine-König return pdrv->err_handler->error_detected(pcidev, state);
601956a9202SRyan Wilson case XEN_PCI_OP_aer_mmio:
60234ab316dSUwe Kleine-König return pdrv->err_handler->mmio_enabled(pcidev);
603956a9202SRyan Wilson case XEN_PCI_OP_aer_slotreset:
60434ab316dSUwe Kleine-König return pdrv->err_handler->slot_reset(pcidev);
605956a9202SRyan Wilson case XEN_PCI_OP_aer_resume:
606956a9202SRyan Wilson pdrv->err_handler->resume(pcidev);
60734ab316dSUwe Kleine-König return PCI_ERS_RESULT_NONE;
608956a9202SRyan Wilson default:
609956a9202SRyan Wilson dev_err(&pdev->xdev->dev,
61034ab316dSUwe Kleine-König "bad request in aer recovery operation!\n");
61134ab316dSUwe Kleine-König }
61234ab316dSUwe Kleine-König }
613956a9202SRyan Wilson
61434ab316dSUwe Kleine-König return PCI_ERS_RESULT_NONE;
615956a9202SRyan Wilson }
616956a9202SRyan Wilson
617956a9202SRyan Wilson
pcifront_do_aer(struct work_struct * data)618956a9202SRyan Wilson static void pcifront_do_aer(struct work_struct *data)
619956a9202SRyan Wilson {
620956a9202SRyan Wilson struct pcifront_device *pdev =
621956a9202SRyan Wilson container_of(data, struct pcifront_device, op_work);
622956a9202SRyan Wilson int cmd = pdev->sh_info->aer_op.cmd;
623956a9202SRyan Wilson pci_channel_state_t state =
624956a9202SRyan Wilson (pci_channel_state_t)pdev->sh_info->aer_op.err;
625956a9202SRyan Wilson
626f956c1b0SSergio Miguéns Iglesias /*
627f956c1b0SSergio Miguéns Iglesias * If a pci_conf op is in progress, we have to wait until it is done
628f956c1b0SSergio Miguéns Iglesias * before service aer op
629f956c1b0SSergio Miguéns Iglesias */
630956a9202SRyan Wilson dev_dbg(&pdev->xdev->dev,
631956a9202SRyan Wilson "pcifront service aer bus %x devfn %x\n",
632956a9202SRyan Wilson pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn);
633956a9202SRyan Wilson
634956a9202SRyan Wilson pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state);
635956a9202SRyan Wilson
636956a9202SRyan Wilson /* Post the operation to the guest. */
637956a9202SRyan Wilson wmb();
638956a9202SRyan Wilson clear_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags);
639956a9202SRyan Wilson notify_remote_via_evtchn(pdev->evtchn);
640956a9202SRyan Wilson
641956a9202SRyan Wilson /*in case of we lost an aer request in four lines time_window*/
6424e857c58SPeter Zijlstra smp_mb__before_atomic();
643956a9202SRyan Wilson clear_bit(_PDEVB_op_active, &pdev->flags);
6444e857c58SPeter Zijlstra smp_mb__after_atomic();
645956a9202SRyan Wilson
646956a9202SRyan Wilson schedule_pcifront_aer_op(pdev);
647956a9202SRyan Wilson
648956a9202SRyan Wilson }
649956a9202SRyan Wilson
pcifront_handler_aer(int irq,void * dev)650956a9202SRyan Wilson static irqreturn_t pcifront_handler_aer(int irq, void *dev)
651956a9202SRyan Wilson {
652956a9202SRyan Wilson struct pcifront_device *pdev = dev;
653f956c1b0SSergio Miguéns Iglesias
654956a9202SRyan Wilson schedule_pcifront_aer_op(pdev);
655956a9202SRyan Wilson return IRQ_HANDLED;
656956a9202SRyan Wilson }
pcifront_connect_and_init_dma(struct pcifront_device * pdev)6573d925320SKonrad Rzeszutek Wilk static int pcifront_connect_and_init_dma(struct pcifront_device *pdev)
658956a9202SRyan Wilson {
659956a9202SRyan Wilson int err = 0;
660956a9202SRyan Wilson
661956a9202SRyan Wilson spin_lock(&pcifront_dev_lock);
662956a9202SRyan Wilson
663956a9202SRyan Wilson if (!pcifront_dev) {
664956a9202SRyan Wilson dev_info(&pdev->xdev->dev, "Installing PCI frontend\n");
665956a9202SRyan Wilson pcifront_dev = pdev;
666098b1aeaSKonrad Rzeszutek Wilk } else
667956a9202SRyan Wilson err = -EEXIST;
668098b1aeaSKonrad Rzeszutek Wilk
669956a9202SRyan Wilson spin_unlock(&pcifront_dev_lock);
670956a9202SRyan Wilson
671956a9202SRyan Wilson return err;
672956a9202SRyan Wilson }
673956a9202SRyan Wilson
pcifront_disconnect(struct pcifront_device * pdev)674956a9202SRyan Wilson static void pcifront_disconnect(struct pcifront_device *pdev)
675956a9202SRyan Wilson {
676956a9202SRyan Wilson spin_lock(&pcifront_dev_lock);
677956a9202SRyan Wilson
678956a9202SRyan Wilson if (pdev == pcifront_dev) {
679956a9202SRyan Wilson dev_info(&pdev->xdev->dev,
680956a9202SRyan Wilson "Disconnecting PCI Frontend Buses\n");
681956a9202SRyan Wilson pcifront_dev = NULL;
682956a9202SRyan Wilson }
683956a9202SRyan Wilson
684956a9202SRyan Wilson spin_unlock(&pcifront_dev_lock);
685956a9202SRyan Wilson }
alloc_pdev(struct xenbus_device * xdev)686956a9202SRyan Wilson static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev)
687956a9202SRyan Wilson {
688956a9202SRyan Wilson struct pcifront_device *pdev;
689956a9202SRyan Wilson
690956a9202SRyan Wilson pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL);
691956a9202SRyan Wilson if (pdev == NULL)
692956a9202SRyan Wilson goto out;
693956a9202SRyan Wilson
6940e6b139dSJuergen Gross if (xenbus_setup_ring(xdev, GFP_KERNEL, (void **)&pdev->sh_info, 1,
6950e6b139dSJuergen Gross &pdev->gnt_ref)) {
696956a9202SRyan Wilson kfree(pdev);
697956a9202SRyan Wilson pdev = NULL;
698956a9202SRyan Wilson goto out;
699956a9202SRyan Wilson }
700956a9202SRyan Wilson pdev->sh_info->flags = 0;
701956a9202SRyan Wilson
702956a9202SRyan Wilson /*Flag for registering PV AER handler*/
703956a9202SRyan Wilson set_bit(_XEN_PCIB_AERHANDLER, (void *)&pdev->sh_info->flags);
704956a9202SRyan Wilson
705956a9202SRyan Wilson dev_set_drvdata(&xdev->dev, pdev);
706956a9202SRyan Wilson pdev->xdev = xdev;
707956a9202SRyan Wilson
708956a9202SRyan Wilson INIT_LIST_HEAD(&pdev->root_buses);
709956a9202SRyan Wilson
710956a9202SRyan Wilson spin_lock_init(&pdev->sh_info_lock);
711956a9202SRyan Wilson
712956a9202SRyan Wilson pdev->evtchn = INVALID_EVTCHN;
713956a9202SRyan Wilson pdev->irq = -1;
714956a9202SRyan Wilson
715956a9202SRyan Wilson INIT_WORK(&pdev->op_work, pcifront_do_aer);
716956a9202SRyan Wilson
717956a9202SRyan Wilson dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n",
718956a9202SRyan Wilson pdev, pdev->sh_info);
719956a9202SRyan Wilson out:
720956a9202SRyan Wilson return pdev;
721956a9202SRyan Wilson }
722956a9202SRyan Wilson
free_pdev(struct pcifront_device * pdev)723956a9202SRyan Wilson static void free_pdev(struct pcifront_device *pdev)
724956a9202SRyan Wilson {
725956a9202SRyan Wilson dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev);
726956a9202SRyan Wilson
727956a9202SRyan Wilson pcifront_free_roots(pdev);
728956a9202SRyan Wilson
729db2e2e6eSTejun Heo cancel_work_sync(&pdev->op_work);
730956a9202SRyan Wilson
731956a9202SRyan Wilson if (pdev->irq >= 0)
732956a9202SRyan Wilson unbind_from_irqhandler(pdev->irq, pdev);
733956a9202SRyan Wilson
734956a9202SRyan Wilson if (pdev->evtchn != INVALID_EVTCHN)
735956a9202SRyan Wilson xenbus_free_evtchn(pdev->xdev, pdev->evtchn);
736956a9202SRyan Wilson
7370e6b139dSJuergen Gross xenbus_teardown_ring((void **)&pdev->sh_info, 1, &pdev->gnt_ref);
738956a9202SRyan Wilson
739956a9202SRyan Wilson dev_set_drvdata(&pdev->xdev->dev, NULL);
740956a9202SRyan Wilson
741956a9202SRyan Wilson kfree(pdev);
742956a9202SRyan Wilson }
743956a9202SRyan Wilson
pcifront_publish_info(struct pcifront_device * pdev)744956a9202SRyan Wilson static int pcifront_publish_info(struct pcifront_device *pdev)
745956a9202SRyan Wilson {
746956a9202SRyan Wilson int err = 0;
747956a9202SRyan Wilson struct xenbus_transaction trans;
748956a9202SRyan Wilson
749956a9202SRyan Wilson err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn);
750956a9202SRyan Wilson if (err)
751956a9202SRyan Wilson goto out;
752956a9202SRyan Wilson
753956a9202SRyan Wilson err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer,
754956a9202SRyan Wilson 0, "pcifront", pdev);
755956a9202SRyan Wilson
756956a9202SRyan Wilson if (err < 0)
757956a9202SRyan Wilson return err;
758956a9202SRyan Wilson
759956a9202SRyan Wilson pdev->irq = err;
760956a9202SRyan Wilson
761956a9202SRyan Wilson do_publish:
762956a9202SRyan Wilson err = xenbus_transaction_start(&trans);
763956a9202SRyan Wilson if (err) {
764956a9202SRyan Wilson xenbus_dev_fatal(pdev->xdev, err,
765956a9202SRyan Wilson "Error writing configuration for backend "
766956a9202SRyan Wilson "(start transaction)");
767956a9202SRyan Wilson goto out;
768956a9202SRyan Wilson }
769956a9202SRyan Wilson
770956a9202SRyan Wilson err = xenbus_printf(trans, pdev->xdev->nodename,
771956a9202SRyan Wilson "pci-op-ref", "%u", pdev->gnt_ref);
772956a9202SRyan Wilson if (!err)
773956a9202SRyan Wilson err = xenbus_printf(trans, pdev->xdev->nodename,
774956a9202SRyan Wilson "event-channel", "%u", pdev->evtchn);
775956a9202SRyan Wilson if (!err)
776956a9202SRyan Wilson err = xenbus_printf(trans, pdev->xdev->nodename,
777956a9202SRyan Wilson "magic", XEN_PCI_MAGIC);
778956a9202SRyan Wilson
779956a9202SRyan Wilson if (err) {
780956a9202SRyan Wilson xenbus_transaction_end(trans, 1);
781956a9202SRyan Wilson xenbus_dev_fatal(pdev->xdev, err,
782956a9202SRyan Wilson "Error writing configuration for backend");
783956a9202SRyan Wilson goto out;
784956a9202SRyan Wilson } else {
785956a9202SRyan Wilson err = xenbus_transaction_end(trans, 0);
786956a9202SRyan Wilson if (err == -EAGAIN)
787956a9202SRyan Wilson goto do_publish;
788956a9202SRyan Wilson else if (err) {
789956a9202SRyan Wilson xenbus_dev_fatal(pdev->xdev, err,
790956a9202SRyan Wilson "Error completing transaction "
791956a9202SRyan Wilson "for backend");
792956a9202SRyan Wilson goto out;
793956a9202SRyan Wilson }
794956a9202SRyan Wilson }
795956a9202SRyan Wilson
796956a9202SRyan Wilson xenbus_switch_state(pdev->xdev, XenbusStateInitialised);
797956a9202SRyan Wilson
798956a9202SRyan Wilson dev_dbg(&pdev->xdev->dev, "publishing successful!\n");
799956a9202SRyan Wilson
800956a9202SRyan Wilson out:
801956a9202SRyan Wilson return err;
802956a9202SRyan Wilson }
803956a9202SRyan Wilson
pcifront_connect(struct pcifront_device * pdev)8042849752fSJuergen Gross static void pcifront_connect(struct pcifront_device *pdev)
805956a9202SRyan Wilson {
8062849752fSJuergen Gross int err;
807956a9202SRyan Wilson int i, num_roots, len;
808956a9202SRyan Wilson char str[64];
809956a9202SRyan Wilson unsigned int domain, bus;
810956a9202SRyan Wilson
811956a9202SRyan Wilson err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend,
812956a9202SRyan Wilson "root_num", "%d", &num_roots);
813956a9202SRyan Wilson if (err == -ENOENT) {
814956a9202SRyan Wilson xenbus_dev_error(pdev->xdev, err,
815956a9202SRyan Wilson "No PCI Roots found, trying 0000:00");
8162849752fSJuergen Gross err = pcifront_rescan_root(pdev, 0, 0);
81723cf1d00SChen Gang if (err) {
81823cf1d00SChen Gang xenbus_dev_fatal(pdev->xdev, err,
81923cf1d00SChen Gang "Error scanning PCI root 0000:00");
8202849752fSJuergen Gross return;
82123cf1d00SChen Gang }
822956a9202SRyan Wilson num_roots = 0;
823956a9202SRyan Wilson } else if (err != 1) {
8242849752fSJuergen Gross xenbus_dev_fatal(pdev->xdev, err >= 0 ? -EINVAL : err,
825956a9202SRyan Wilson "Error reading number of PCI roots");
8262849752fSJuergen Gross return;
827956a9202SRyan Wilson }
828956a9202SRyan Wilson
829956a9202SRyan Wilson for (i = 0; i < num_roots; i++) {
830956a9202SRyan Wilson len = snprintf(str, sizeof(str), "root-%d", i);
8312849752fSJuergen Gross if (unlikely(len >= (sizeof(str) - 1)))
8322849752fSJuergen Gross return;
833956a9202SRyan Wilson
834956a9202SRyan Wilson err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
835956a9202SRyan Wilson "%x:%x", &domain, &bus);
836956a9202SRyan Wilson if (err != 2) {
8372849752fSJuergen Gross xenbus_dev_fatal(pdev->xdev, err >= 0 ? -EINVAL : err,
838956a9202SRyan Wilson "Error reading PCI root %d", i);
8392849752fSJuergen Gross return;
840956a9202SRyan Wilson }
841956a9202SRyan Wilson
8422849752fSJuergen Gross err = pcifront_rescan_root(pdev, domain, bus);
843956a9202SRyan Wilson if (err) {
844956a9202SRyan Wilson xenbus_dev_fatal(pdev->xdev, err,
845956a9202SRyan Wilson "Error scanning PCI root %04x:%02x",
846956a9202SRyan Wilson domain, bus);
8472849752fSJuergen Gross return;
848956a9202SRyan Wilson }
849956a9202SRyan Wilson }
850956a9202SRyan Wilson
8512849752fSJuergen Gross xenbus_switch_state(pdev->xdev, XenbusStateConnected);
8522849752fSJuergen Gross }
853956a9202SRyan Wilson
pcifront_try_connect(struct pcifront_device * pdev)8542849752fSJuergen Gross static void pcifront_try_connect(struct pcifront_device *pdev)
8552849752fSJuergen Gross {
8562849752fSJuergen Gross int err;
8572849752fSJuergen Gross
8582849752fSJuergen Gross /* Only connect once */
8592849752fSJuergen Gross if (xenbus_read_driver_state(pdev->xdev->nodename) !=
8602849752fSJuergen Gross XenbusStateInitialised)
8612849752fSJuergen Gross return;
8622849752fSJuergen Gross
8632849752fSJuergen Gross err = pcifront_connect_and_init_dma(pdev);
8642849752fSJuergen Gross if (err && err != -EEXIST) {
8652849752fSJuergen Gross xenbus_dev_fatal(pdev->xdev, err,
8662849752fSJuergen Gross "Error setting up PCI Frontend");
8672849752fSJuergen Gross return;
8682849752fSJuergen Gross }
8692849752fSJuergen Gross
8702849752fSJuergen Gross pcifront_connect(pdev);
871956a9202SRyan Wilson }
872956a9202SRyan Wilson
pcifront_try_disconnect(struct pcifront_device * pdev)873956a9202SRyan Wilson static int pcifront_try_disconnect(struct pcifront_device *pdev)
874956a9202SRyan Wilson {
875956a9202SRyan Wilson int err = 0;
876956a9202SRyan Wilson enum xenbus_state prev_state;
877956a9202SRyan Wilson
878956a9202SRyan Wilson
879956a9202SRyan Wilson prev_state = xenbus_read_driver_state(pdev->xdev->nodename);
880956a9202SRyan Wilson
881956a9202SRyan Wilson if (prev_state >= XenbusStateClosing)
882956a9202SRyan Wilson goto out;
883956a9202SRyan Wilson
884956a9202SRyan Wilson if (prev_state == XenbusStateConnected) {
885956a9202SRyan Wilson pcifront_free_roots(pdev);
886956a9202SRyan Wilson pcifront_disconnect(pdev);
887956a9202SRyan Wilson }
888956a9202SRyan Wilson
889956a9202SRyan Wilson err = xenbus_switch_state(pdev->xdev, XenbusStateClosed);
890956a9202SRyan Wilson
891956a9202SRyan Wilson out:
892956a9202SRyan Wilson
893956a9202SRyan Wilson return err;
894956a9202SRyan Wilson }
895956a9202SRyan Wilson
pcifront_attach_devices(struct pcifront_device * pdev)8962849752fSJuergen Gross static void pcifront_attach_devices(struct pcifront_device *pdev)
897956a9202SRyan Wilson {
8982849752fSJuergen Gross if (xenbus_read_driver_state(pdev->xdev->nodename) ==
899956a9202SRyan Wilson XenbusStateReconfiguring)
9002849752fSJuergen Gross pcifront_connect(pdev);
901956a9202SRyan Wilson }
902956a9202SRyan Wilson
pcifront_detach_devices(struct pcifront_device * pdev)903956a9202SRyan Wilson static int pcifront_detach_devices(struct pcifront_device *pdev)
904956a9202SRyan Wilson {
905956a9202SRyan Wilson int err = 0;
906956a9202SRyan Wilson int i, num_devs;
907728c2edfSJason Andryuk enum xenbus_state state;
908956a9202SRyan Wilson unsigned int domain, bus, slot, func;
909956a9202SRyan Wilson struct pci_dev *pci_dev;
910956a9202SRyan Wilson char str[64];
911956a9202SRyan Wilson
912728c2edfSJason Andryuk state = xenbus_read_driver_state(pdev->xdev->nodename);
913728c2edfSJason Andryuk if (state == XenbusStateInitialised) {
914728c2edfSJason Andryuk dev_dbg(&pdev->xdev->dev, "Handle skipped connect.\n");
915728c2edfSJason Andryuk /* We missed Connected and need to initialize. */
916728c2edfSJason Andryuk err = pcifront_connect_and_init_dma(pdev);
917728c2edfSJason Andryuk if (err && err != -EEXIST) {
918728c2edfSJason Andryuk xenbus_dev_fatal(pdev->xdev, err,
919728c2edfSJason Andryuk "Error setting up PCI Frontend");
920956a9202SRyan Wilson goto out;
921728c2edfSJason Andryuk }
922728c2edfSJason Andryuk
923728c2edfSJason Andryuk goto out_switch_state;
924728c2edfSJason Andryuk } else if (state != XenbusStateConnected) {
925728c2edfSJason Andryuk goto out;
926728c2edfSJason Andryuk }
927956a9202SRyan Wilson
928956a9202SRyan Wilson err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d",
929956a9202SRyan Wilson &num_devs);
930956a9202SRyan Wilson if (err != 1) {
931956a9202SRyan Wilson if (err >= 0)
932956a9202SRyan Wilson err = -EINVAL;
933956a9202SRyan Wilson xenbus_dev_fatal(pdev->xdev, err,
934956a9202SRyan Wilson "Error reading number of PCI devices");
935956a9202SRyan Wilson goto out;
936956a9202SRyan Wilson }
937956a9202SRyan Wilson
938956a9202SRyan Wilson /* Find devices being detached and remove them. */
939956a9202SRyan Wilson for (i = 0; i < num_devs; i++) {
940956a9202SRyan Wilson int l, state;
941f956c1b0SSergio Miguéns Iglesias
942956a9202SRyan Wilson l = snprintf(str, sizeof(str), "state-%d", i);
943956a9202SRyan Wilson if (unlikely(l >= (sizeof(str) - 1))) {
944956a9202SRyan Wilson err = -ENOMEM;
945956a9202SRyan Wilson goto out;
946956a9202SRyan Wilson }
94758faf07bSJuergen Gross state = xenbus_read_unsigned(pdev->xdev->otherend, str,
94858faf07bSJuergen Gross XenbusStateUnknown);
949956a9202SRyan Wilson
950956a9202SRyan Wilson if (state != XenbusStateClosing)
951956a9202SRyan Wilson continue;
952956a9202SRyan Wilson
953956a9202SRyan Wilson /* Remove device. */
954956a9202SRyan Wilson l = snprintf(str, sizeof(str), "vdev-%d", i);
955956a9202SRyan Wilson if (unlikely(l >= (sizeof(str) - 1))) {
956956a9202SRyan Wilson err = -ENOMEM;
957956a9202SRyan Wilson goto out;
958956a9202SRyan Wilson }
959956a9202SRyan Wilson err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
960956a9202SRyan Wilson "%x:%x:%x.%x", &domain, &bus, &slot, &func);
961956a9202SRyan Wilson if (err != 4) {
962956a9202SRyan Wilson if (err >= 0)
963956a9202SRyan Wilson err = -EINVAL;
964956a9202SRyan Wilson xenbus_dev_fatal(pdev->xdev, err,
965956a9202SRyan Wilson "Error reading PCI device %d", i);
966956a9202SRyan Wilson goto out;
967956a9202SRyan Wilson }
968956a9202SRyan Wilson
9692ccc246dSJiang Liu pci_dev = pci_get_domain_bus_and_slot(domain, bus,
9702ccc246dSJiang Liu PCI_DEVFN(slot, func));
971956a9202SRyan Wilson if (!pci_dev) {
972956a9202SRyan Wilson dev_dbg(&pdev->xdev->dev,
973e4de866aSKonrad Rzeszutek Wilk "Cannot get PCI device %04x:%02x:%02x.%d\n",
974956a9202SRyan Wilson domain, bus, slot, func);
975956a9202SRyan Wilson continue;
976956a9202SRyan Wilson }
977a83919e0SRafael J. Wysocki pci_lock_rescan_remove();
978210647afSYinghai Lu pci_stop_and_remove_bus_device(pci_dev);
979956a9202SRyan Wilson pci_dev_put(pci_dev);
980a83919e0SRafael J. Wysocki pci_unlock_rescan_remove();
981956a9202SRyan Wilson
982956a9202SRyan Wilson dev_dbg(&pdev->xdev->dev,
983e4de866aSKonrad Rzeszutek Wilk "PCI device %04x:%02x:%02x.%d removed.\n",
984956a9202SRyan Wilson domain, bus, slot, func);
985956a9202SRyan Wilson }
986956a9202SRyan Wilson
987728c2edfSJason Andryuk out_switch_state:
988956a9202SRyan Wilson err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring);
989956a9202SRyan Wilson
990956a9202SRyan Wilson out:
991956a9202SRyan Wilson return err;
992956a9202SRyan Wilson }
993956a9202SRyan Wilson
pcifront_backend_changed(struct xenbus_device * xdev,enum xenbus_state be_state)994f956c1b0SSergio Miguéns Iglesias static void pcifront_backend_changed(struct xenbus_device *xdev,
995956a9202SRyan Wilson enum xenbus_state be_state)
996956a9202SRyan Wilson {
997956a9202SRyan Wilson struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev);
998956a9202SRyan Wilson
999956a9202SRyan Wilson switch (be_state) {
1000956a9202SRyan Wilson case XenbusStateUnknown:
1001956a9202SRyan Wilson case XenbusStateInitialising:
1002956a9202SRyan Wilson case XenbusStateInitWait:
1003956a9202SRyan Wilson case XenbusStateInitialised:
1004956a9202SRyan Wilson break;
1005956a9202SRyan Wilson
1006956a9202SRyan Wilson case XenbusStateConnected:
1007956a9202SRyan Wilson pcifront_try_connect(pdev);
1008956a9202SRyan Wilson break;
1009956a9202SRyan Wilson
1010d5af64deSDavid Vrabel case XenbusStateClosed:
1011d5af64deSDavid Vrabel if (xdev->state == XenbusStateClosed)
1012d5af64deSDavid Vrabel break;
1013df561f66SGustavo A. R. Silva fallthrough; /* Missed the backend's CLOSING state */
1014956a9202SRyan Wilson case XenbusStateClosing:
1015956a9202SRyan Wilson dev_warn(&xdev->dev, "backend going away!\n");
1016956a9202SRyan Wilson pcifront_try_disconnect(pdev);
1017956a9202SRyan Wilson break;
1018956a9202SRyan Wilson
1019956a9202SRyan Wilson case XenbusStateReconfiguring:
1020956a9202SRyan Wilson pcifront_detach_devices(pdev);
1021956a9202SRyan Wilson break;
1022956a9202SRyan Wilson
1023956a9202SRyan Wilson case XenbusStateReconfigured:
1024956a9202SRyan Wilson pcifront_attach_devices(pdev);
1025956a9202SRyan Wilson break;
1026956a9202SRyan Wilson }
1027956a9202SRyan Wilson }
1028956a9202SRyan Wilson
pcifront_xenbus_probe(struct xenbus_device * xdev,const struct xenbus_device_id * id)1029956a9202SRyan Wilson static int pcifront_xenbus_probe(struct xenbus_device *xdev,
1030956a9202SRyan Wilson const struct xenbus_device_id *id)
1031956a9202SRyan Wilson {
1032956a9202SRyan Wilson int err = 0;
1033956a9202SRyan Wilson struct pcifront_device *pdev = alloc_pdev(xdev);
1034956a9202SRyan Wilson
1035956a9202SRyan Wilson if (pdev == NULL) {
1036956a9202SRyan Wilson err = -ENOMEM;
1037956a9202SRyan Wilson xenbus_dev_fatal(xdev, err,
1038956a9202SRyan Wilson "Error allocating pcifront_device struct");
1039956a9202SRyan Wilson goto out;
1040956a9202SRyan Wilson }
1041956a9202SRyan Wilson
1042956a9202SRyan Wilson err = pcifront_publish_info(pdev);
1043956a9202SRyan Wilson if (err)
1044956a9202SRyan Wilson free_pdev(pdev);
1045956a9202SRyan Wilson
1046956a9202SRyan Wilson out:
1047956a9202SRyan Wilson return err;
1048956a9202SRyan Wilson }
1049956a9202SRyan Wilson
pcifront_xenbus_remove(struct xenbus_device * xdev)10507cffcadeSDawei Li static void pcifront_xenbus_remove(struct xenbus_device *xdev)
1051956a9202SRyan Wilson {
1052956a9202SRyan Wilson struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev);
1053f956c1b0SSergio Miguéns Iglesias
1054956a9202SRyan Wilson if (pdev)
1055956a9202SRyan Wilson free_pdev(pdev);
1056956a9202SRyan Wilson }
1057956a9202SRyan Wilson
1058956a9202SRyan Wilson static const struct xenbus_device_id xenpci_ids[] = {
1059956a9202SRyan Wilson {"pci"},
1060956a9202SRyan Wilson {""},
1061956a9202SRyan Wilson };
1062956a9202SRyan Wilson
106395afae48SDavid Vrabel static struct xenbus_driver xenpci_driver = {
106495afae48SDavid Vrabel .name = "pcifront",
106595afae48SDavid Vrabel .ids = xenpci_ids,
1066956a9202SRyan Wilson .probe = pcifront_xenbus_probe,
1067956a9202SRyan Wilson .remove = pcifront_xenbus_remove,
1068956a9202SRyan Wilson .otherend_changed = pcifront_backend_changed,
106995afae48SDavid Vrabel };
1070956a9202SRyan Wilson
pcifront_init(void)1071956a9202SRyan Wilson static int __init pcifront_init(void)
1072956a9202SRyan Wilson {
1073956a9202SRyan Wilson if (!xen_pv_domain() || xen_initial_domain())
1074956a9202SRyan Wilson return -ENODEV;
1075956a9202SRyan Wilson
107651c71a3bSKonrad Rzeszutek Wilk if (!xen_has_pv_devices())
107751c71a3bSKonrad Rzeszutek Wilk return -ENODEV;
107851c71a3bSKonrad Rzeszutek Wilk
1079956a9202SRyan Wilson pci_frontend_registrar(1 /* enable */);
1080956a9202SRyan Wilson
108173db144bSJan Beulich return xenbus_register_frontend(&xenpci_driver);
1082956a9202SRyan Wilson }
1083956a9202SRyan Wilson
pcifront_cleanup(void)1084956a9202SRyan Wilson static void __exit pcifront_cleanup(void)
1085956a9202SRyan Wilson {
108673db144bSJan Beulich xenbus_unregister_driver(&xenpci_driver);
1087956a9202SRyan Wilson pci_frontend_registrar(0 /* disable */);
1088956a9202SRyan Wilson }
1089956a9202SRyan Wilson module_init(pcifront_init);
1090956a9202SRyan Wilson module_exit(pcifront_cleanup);
1091956a9202SRyan Wilson
1092956a9202SRyan Wilson MODULE_DESCRIPTION("Xen PCI passthrough frontend.");
1093956a9202SRyan Wilson MODULE_LICENSE("GPL");
1094956a9202SRyan Wilson MODULE_ALIAS("xen:pci");
1095