Bjorn Helgaas | 7328c8f | 2018-01-26 11:45:16 -0600 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 2 | /* |
Bjorn Helgaas | df62ab5 | 2018-03-09 16:36:33 -0600 | [diff] [blame] | 3 | * Xen PCI Frontend |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 4 | * |
Bjorn Helgaas | df62ab5 | 2018-03-09 16:36:33 -0600 | [diff] [blame] | 5 | * Author: Ryan Wilson <hap9@epoch.ncsc.mil> |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 6 | */ |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/init.h> |
| 9 | #include <linux/mm.h> |
| 10 | #include <xen/xenbus.h> |
| 11 | #include <xen/events.h> |
| 12 | #include <xen/grant_table.h> |
| 13 | #include <xen/page.h> |
| 14 | #include <linux/spinlock.h> |
| 15 | #include <linux/pci.h> |
| 16 | #include <linux/msi.h> |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 17 | #include <xen/interface/io/pciif.h> |
| 18 | #include <asm/xen/pci.h> |
| 19 | #include <linux/interrupt.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 20 | #include <linux/atomic.h> |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 21 | #include <linux/workqueue.h> |
| 22 | #include <linux/bitops.h> |
| 23 | #include <linux/time.h> |
Tina Ruchandani | e1d5bbc | 2015-05-19 11:38:09 +0530 | [diff] [blame] | 24 | #include <linux/ktime.h> |
Christoph Hellwig | 0a0f0d8 | 2020-09-22 15:31:03 +0200 | [diff] [blame] | 25 | #include <linux/swiotlb.h> |
Konrad Rzeszutek Wilk | 51c71a3 | 2013-11-26 15:05:40 -0500 | [diff] [blame] | 26 | #include <xen/platform_pci.h> |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 27 | |
Konrad Rzeszutek Wilk | 3d92532 | 2012-07-31 06:26:59 -0400 | [diff] [blame] | 28 | #include <asm/xen/swiotlb-xen.h> |
Jan Beulich | bce21a2 | 2021-03-10 11:45:26 +0100 | [diff] [blame] | 29 | |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 30 | #define INVALID_EVTCHN (-1) |
| 31 | |
| 32 | struct pci_bus_entry { |
| 33 | struct list_head list; |
| 34 | struct pci_bus *bus; |
| 35 | }; |
| 36 | |
| 37 | #define _PDEVB_op_active (0) |
| 38 | #define PDEVB_op_active (1 << (_PDEVB_op_active)) |
| 39 | |
| 40 | struct pcifront_device { |
| 41 | struct xenbus_device *xdev; |
| 42 | struct list_head root_buses; |
| 43 | |
| 44 | int evtchn; |
Jan Beulich | bce21a2 | 2021-03-10 11:45:26 +0100 | [diff] [blame] | 45 | grant_ref_t gnt_ref; |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 46 | |
| 47 | int irq; |
| 48 | |
| 49 | /* Lock this when doing any operations in sh_info */ |
| 50 | spinlock_t sh_info_lock; |
| 51 | struct xen_pci_sharedinfo *sh_info; |
| 52 | struct work_struct op_work; |
| 53 | unsigned long flags; |
| 54 | |
| 55 | }; |
| 56 | |
| 57 | struct pcifront_sd { |
Konrad Rzeszutek Wilk | 4d8c8bd | 2016-02-11 16:10:26 -0500 | [diff] [blame] | 58 | struct pci_sysdata sd; |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 59 | struct pcifront_device *pdev; |
| 60 | }; |
| 61 | |
| 62 | static inline struct pcifront_device * |
| 63 | pcifront_get_pdev(struct pcifront_sd *sd) |
| 64 | { |
| 65 | return sd->pdev; |
| 66 | } |
| 67 | |
| 68 | static inline void pcifront_init_sd(struct pcifront_sd *sd, |
| 69 | unsigned int domain, unsigned int bus, |
| 70 | struct pcifront_device *pdev) |
| 71 | { |
Konrad Rzeszutek Wilk | 4d8c8bd | 2016-02-11 16:10:26 -0500 | [diff] [blame] | 72 | /* Because we do not expose that information via XenBus. */ |
| 73 | sd->sd.node = first_online_node; |
| 74 | sd->sd.domain = domain; |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 75 | sd->pdev = pdev; |
| 76 | } |
| 77 | |
| 78 | static DEFINE_SPINLOCK(pcifront_dev_lock); |
| 79 | static struct pcifront_device *pcifront_dev; |
| 80 | |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 81 | static int errno_to_pcibios_err(int errno) |
| 82 | { |
| 83 | switch (errno) { |
| 84 | case XEN_PCI_ERR_success: |
| 85 | return PCIBIOS_SUCCESSFUL; |
| 86 | |
| 87 | case XEN_PCI_ERR_dev_not_found: |
| 88 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 89 | |
| 90 | case XEN_PCI_ERR_invalid_offset: |
| 91 | case XEN_PCI_ERR_op_failed: |
| 92 | return PCIBIOS_BAD_REGISTER_NUMBER; |
| 93 | |
| 94 | case XEN_PCI_ERR_not_implemented: |
| 95 | return PCIBIOS_FUNC_NOT_SUPPORTED; |
| 96 | |
| 97 | case XEN_PCI_ERR_access_denied: |
| 98 | return PCIBIOS_SET_FAILED; |
| 99 | } |
| 100 | return errno; |
| 101 | } |
| 102 | |
| 103 | static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev) |
| 104 | { |
| 105 | if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags) |
| 106 | && !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) { |
| 107 | dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n"); |
| 108 | schedule_work(&pdev->op_work); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op) |
| 113 | { |
| 114 | int err = 0; |
| 115 | struct xen_pci_op *active_op = &pdev->sh_info->op; |
| 116 | unsigned long irq_flags; |
| 117 | evtchn_port_t port = pdev->evtchn; |
| 118 | unsigned irq = pdev->irq; |
| 119 | s64 ns, ns_timeout; |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 120 | |
| 121 | spin_lock_irqsave(&pdev->sh_info_lock, irq_flags); |
| 122 | |
| 123 | memcpy(active_op, op, sizeof(struct xen_pci_op)); |
| 124 | |
| 125 | /* Go */ |
| 126 | wmb(); |
| 127 | set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags); |
| 128 | notify_remote_via_evtchn(port); |
| 129 | |
| 130 | /* |
| 131 | * We set a poll timeout of 3 seconds but give up on return after |
| 132 | * 2 seconds. It is better to time out too late rather than too early |
| 133 | * (in the latter case we end up continually re-executing poll() with a |
| 134 | * timeout in the past). 1s difference gives plenty of slack for error. |
| 135 | */ |
Tina Ruchandani | e1d5bbc | 2015-05-19 11:38:09 +0530 | [diff] [blame] | 136 | ns_timeout = ktime_get_ns() + 2 * (s64)NSEC_PER_SEC; |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 137 | |
| 138 | xen_clear_irq_pending(irq); |
| 139 | |
| 140 | while (test_bit(_XEN_PCIF_active, |
| 141 | (unsigned long *)&pdev->sh_info->flags)) { |
| 142 | xen_poll_irq_timeout(irq, jiffies + 3*HZ); |
| 143 | xen_clear_irq_pending(irq); |
Tina Ruchandani | e1d5bbc | 2015-05-19 11:38:09 +0530 | [diff] [blame] | 144 | ns = ktime_get_ns(); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 145 | if (ns > ns_timeout) { |
| 146 | dev_err(&pdev->xdev->dev, |
| 147 | "pciback not responding!!!\n"); |
| 148 | clear_bit(_XEN_PCIF_active, |
| 149 | (unsigned long *)&pdev->sh_info->flags); |
| 150 | err = XEN_PCI_ERR_dev_not_found; |
| 151 | goto out; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * We might lose backend service request since we |
| 157 | * reuse same evtchn with pci_conf backend response. So re-schedule |
| 158 | * aer pcifront service. |
| 159 | */ |
| 160 | if (test_bit(_XEN_PCIB_active, |
| 161 | (unsigned long *)&pdev->sh_info->flags)) { |
| 162 | dev_err(&pdev->xdev->dev, |
| 163 | "schedule aer pcifront service\n"); |
| 164 | schedule_pcifront_aer_op(pdev); |
| 165 | } |
| 166 | |
| 167 | memcpy(op, active_op, sizeof(struct xen_pci_op)); |
| 168 | |
| 169 | err = op->err; |
| 170 | out: |
| 171 | spin_unlock_irqrestore(&pdev->sh_info_lock, irq_flags); |
| 172 | return err; |
| 173 | } |
| 174 | |
| 175 | /* Access to this function is spinlocked in drivers/pci/access.c */ |
| 176 | static int pcifront_bus_read(struct pci_bus *bus, unsigned int devfn, |
| 177 | int where, int size, u32 *val) |
| 178 | { |
| 179 | int err = 0; |
| 180 | struct xen_pci_op op = { |
| 181 | .cmd = XEN_PCI_OP_conf_read, |
| 182 | .domain = pci_domain_nr(bus), |
| 183 | .bus = bus->number, |
| 184 | .devfn = devfn, |
| 185 | .offset = where, |
| 186 | .size = size, |
| 187 | }; |
| 188 | struct pcifront_sd *sd = bus->sysdata; |
| 189 | struct pcifront_device *pdev = pcifront_get_pdev(sd); |
| 190 | |
Boris Ostrovsky | 4969a3a | 2020-05-28 22:24:52 -0400 | [diff] [blame] | 191 | dev_dbg(&pdev->xdev->dev, |
| 192 | "read dev=%04x:%02x:%02x.%d - offset %x size %d\n", |
| 193 | pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), |
| 194 | PCI_FUNC(devfn), where, size); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 195 | |
| 196 | err = do_pci_op(pdev, &op); |
| 197 | |
| 198 | if (likely(!err)) { |
Boris Ostrovsky | 4969a3a | 2020-05-28 22:24:52 -0400 | [diff] [blame] | 199 | dev_dbg(&pdev->xdev->dev, "read got back value %x\n", |
| 200 | op.value); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 201 | |
| 202 | *val = op.value; |
| 203 | } else if (err == -ENODEV) { |
| 204 | /* No device here, pretend that it just returned 0 */ |
| 205 | err = 0; |
| 206 | *val = 0; |
| 207 | } |
| 208 | |
| 209 | return errno_to_pcibios_err(err); |
| 210 | } |
| 211 | |
| 212 | /* Access to this function is spinlocked in drivers/pci/access.c */ |
| 213 | static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn, |
| 214 | int where, int size, u32 val) |
| 215 | { |
| 216 | struct xen_pci_op op = { |
| 217 | .cmd = XEN_PCI_OP_conf_write, |
| 218 | .domain = pci_domain_nr(bus), |
| 219 | .bus = bus->number, |
| 220 | .devfn = devfn, |
| 221 | .offset = where, |
| 222 | .size = size, |
| 223 | .value = val, |
| 224 | }; |
| 225 | struct pcifront_sd *sd = bus->sysdata; |
| 226 | struct pcifront_device *pdev = pcifront_get_pdev(sd); |
| 227 | |
Boris Ostrovsky | 4969a3a | 2020-05-28 22:24:52 -0400 | [diff] [blame] | 228 | dev_dbg(&pdev->xdev->dev, |
| 229 | "write dev=%04x:%02x:%02x.%d - offset %x size %d val %x\n", |
| 230 | pci_domain_nr(bus), bus->number, |
| 231 | PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 232 | |
| 233 | return errno_to_pcibios_err(do_pci_op(pdev, &op)); |
| 234 | } |
| 235 | |
Konrad Rzeszutek Wilk | b8b0f55 | 2012-08-21 14:49:34 -0400 | [diff] [blame] | 236 | static struct pci_ops pcifront_bus_ops = { |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 237 | .read = pcifront_bus_read, |
| 238 | .write = pcifront_bus_write, |
| 239 | }; |
| 240 | |
| 241 | #ifdef CONFIG_PCI_MSI |
| 242 | static int pci_frontend_enable_msix(struct pci_dev *dev, |
Konrad Rzeszutek Wilk | cc0f89c | 2011-02-17 12:02:23 -0500 | [diff] [blame] | 243 | int vector[], int nvec) |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 244 | { |
| 245 | int err; |
| 246 | int i; |
| 247 | struct xen_pci_op op = { |
| 248 | .cmd = XEN_PCI_OP_enable_msix, |
| 249 | .domain = pci_domain_nr(dev->bus), |
| 250 | .bus = dev->bus->number, |
| 251 | .devfn = dev->devfn, |
| 252 | .value = nvec, |
| 253 | }; |
| 254 | struct pcifront_sd *sd = dev->bus->sysdata; |
| 255 | struct pcifront_device *pdev = pcifront_get_pdev(sd); |
| 256 | struct msi_desc *entry; |
| 257 | |
| 258 | if (nvec > SH_INFO_MAX_VEC) { |
Frederick Lawler | 7506dc7 | 2018-01-18 12:55:24 -0600 | [diff] [blame] | 259 | pci_err(dev, "too many vectors (0x%x) for PCI frontend:" |
| 260 | " Increase SH_INFO_MAX_VEC\n", nvec); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 261 | return -EINVAL; |
| 262 | } |
| 263 | |
| 264 | i = 0; |
Jiang Liu | 5004e98a | 2015-07-09 16:00:41 +0800 | [diff] [blame] | 265 | for_each_pci_msi_entry(entry, dev) { |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 266 | op.msix_entries[i].entry = entry->msi_attrib.entry_nr; |
| 267 | /* Vector is useless at this point. */ |
| 268 | op.msix_entries[i].vector = -1; |
| 269 | i++; |
| 270 | } |
| 271 | |
| 272 | err = do_pci_op(pdev, &op); |
| 273 | |
| 274 | if (likely(!err)) { |
| 275 | if (likely(!op.value)) { |
| 276 | /* we get the result */ |
Konrad Rzeszutek Wilk | 1d46105 | 2011-02-16 13:43:22 -0500 | [diff] [blame] | 277 | for (i = 0; i < nvec; i++) { |
| 278 | if (op.msix_entries[i].vector <= 0) { |
Frederick Lawler | 7506dc7 | 2018-01-18 12:55:24 -0600 | [diff] [blame] | 279 | pci_warn(dev, "MSI-X entry %d is invalid: %d!\n", |
Konrad Rzeszutek Wilk | 1d46105 | 2011-02-16 13:43:22 -0500 | [diff] [blame] | 280 | i, op.msix_entries[i].vector); |
| 281 | err = -EINVAL; |
Konrad Rzeszutek Wilk | cc0f89c | 2011-02-17 12:02:23 -0500 | [diff] [blame] | 282 | vector[i] = -1; |
Konrad Rzeszutek Wilk | 1d46105 | 2011-02-16 13:43:22 -0500 | [diff] [blame] | 283 | continue; |
| 284 | } |
Konrad Rzeszutek Wilk | cc0f89c | 2011-02-17 12:02:23 -0500 | [diff] [blame] | 285 | vector[i] = op.msix_entries[i].vector; |
Konrad Rzeszutek Wilk | 1d46105 | 2011-02-16 13:43:22 -0500 | [diff] [blame] | 286 | } |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 287 | } else { |
Mohan Kumar | 34c6b71 | 2019-04-20 07:07:20 +0300 | [diff] [blame] | 288 | pr_info("enable msix get value %x\n", op.value); |
Jan Beulich | f09d843 | 2012-04-02 15:22:39 +0100 | [diff] [blame] | 289 | err = op.value; |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 290 | } |
| 291 | } else { |
Frederick Lawler | 7506dc7 | 2018-01-18 12:55:24 -0600 | [diff] [blame] | 292 | pci_err(dev, "enable msix get err %x\n", err); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 293 | } |
Konrad Rzeszutek Wilk | 1d46105 | 2011-02-16 13:43:22 -0500 | [diff] [blame] | 294 | return err; |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 295 | } |
| 296 | |
| 297 | static void pci_frontend_disable_msix(struct pci_dev *dev) |
| 298 | { |
| 299 | int err; |
| 300 | struct xen_pci_op op = { |
| 301 | .cmd = XEN_PCI_OP_disable_msix, |
| 302 | .domain = pci_domain_nr(dev->bus), |
| 303 | .bus = dev->bus->number, |
| 304 | .devfn = dev->devfn, |
| 305 | }; |
| 306 | struct pcifront_sd *sd = dev->bus->sysdata; |
| 307 | struct pcifront_device *pdev = pcifront_get_pdev(sd); |
| 308 | |
| 309 | err = do_pci_op(pdev, &op); |
| 310 | |
| 311 | /* What should do for error ? */ |
| 312 | if (err) |
Frederick Lawler | 7506dc7 | 2018-01-18 12:55:24 -0600 | [diff] [blame] | 313 | pci_err(dev, "pci_disable_msix get err %x\n", err); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 314 | } |
| 315 | |
Konrad Rzeszutek Wilk | cc0f89c | 2011-02-17 12:02:23 -0500 | [diff] [blame] | 316 | static int pci_frontend_enable_msi(struct pci_dev *dev, int vector[]) |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 317 | { |
| 318 | int err; |
| 319 | struct xen_pci_op op = { |
| 320 | .cmd = XEN_PCI_OP_enable_msi, |
| 321 | .domain = pci_domain_nr(dev->bus), |
| 322 | .bus = dev->bus->number, |
| 323 | .devfn = dev->devfn, |
| 324 | }; |
| 325 | struct pcifront_sd *sd = dev->bus->sysdata; |
| 326 | struct pcifront_device *pdev = pcifront_get_pdev(sd); |
| 327 | |
| 328 | err = do_pci_op(pdev, &op); |
| 329 | if (likely(!err)) { |
Konrad Rzeszutek Wilk | cc0f89c | 2011-02-17 12:02:23 -0500 | [diff] [blame] | 330 | vector[0] = op.value; |
Konrad Rzeszutek Wilk | 1d46105 | 2011-02-16 13:43:22 -0500 | [diff] [blame] | 331 | if (op.value <= 0) { |
Frederick Lawler | 7506dc7 | 2018-01-18 12:55:24 -0600 | [diff] [blame] | 332 | pci_warn(dev, "MSI entry is invalid: %d!\n", |
Konrad Rzeszutek Wilk | 1d46105 | 2011-02-16 13:43:22 -0500 | [diff] [blame] | 333 | op.value); |
| 334 | err = -EINVAL; |
Konrad Rzeszutek Wilk | cc0f89c | 2011-02-17 12:02:23 -0500 | [diff] [blame] | 335 | vector[0] = -1; |
Konrad Rzeszutek Wilk | 1d46105 | 2011-02-16 13:43:22 -0500 | [diff] [blame] | 336 | } |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 337 | } else { |
Frederick Lawler | 7506dc7 | 2018-01-18 12:55:24 -0600 | [diff] [blame] | 338 | pci_err(dev, "pci frontend enable msi failed for dev " |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 339 | "%x:%x\n", op.bus, op.devfn); |
| 340 | err = -EINVAL; |
| 341 | } |
| 342 | return err; |
| 343 | } |
| 344 | |
| 345 | static void pci_frontend_disable_msi(struct pci_dev *dev) |
| 346 | { |
| 347 | int err; |
| 348 | struct xen_pci_op op = { |
| 349 | .cmd = XEN_PCI_OP_disable_msi, |
| 350 | .domain = pci_domain_nr(dev->bus), |
| 351 | .bus = dev->bus->number, |
| 352 | .devfn = dev->devfn, |
| 353 | }; |
| 354 | struct pcifront_sd *sd = dev->bus->sysdata; |
| 355 | struct pcifront_device *pdev = pcifront_get_pdev(sd); |
| 356 | |
| 357 | err = do_pci_op(pdev, &op); |
| 358 | if (err == XEN_PCI_ERR_dev_not_found) { |
| 359 | /* XXX No response from backend, what shall we do? */ |
Mohan Kumar | 34c6b71 | 2019-04-20 07:07:20 +0300 | [diff] [blame] | 360 | pr_info("get no response from backend for disable MSI\n"); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 361 | return; |
| 362 | } |
| 363 | if (err) |
| 364 | /* how can pciback notify us fail? */ |
Mohan Kumar | 34c6b71 | 2019-04-20 07:07:20 +0300 | [diff] [blame] | 365 | pr_info("get fake response from backend\n"); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 366 | } |
| 367 | |
| 368 | static struct xen_pci_frontend_ops pci_frontend_ops = { |
| 369 | .enable_msi = pci_frontend_enable_msi, |
| 370 | .disable_msi = pci_frontend_disable_msi, |
| 371 | .enable_msix = pci_frontend_enable_msix, |
| 372 | .disable_msix = pci_frontend_disable_msix, |
| 373 | }; |
| 374 | |
| 375 | static void pci_frontend_registrar(int enable) |
| 376 | { |
| 377 | if (enable) |
| 378 | xen_pci_frontend = &pci_frontend_ops; |
| 379 | else |
| 380 | xen_pci_frontend = NULL; |
| 381 | }; |
| 382 | #else |
| 383 | static inline void pci_frontend_registrar(int enable) { }; |
| 384 | #endif /* CONFIG_PCI_MSI */ |
| 385 | |
| 386 | /* Claim resources for the PCI frontend as-is, backend won't allow changes */ |
| 387 | static int pcifront_claim_resource(struct pci_dev *dev, void *data) |
| 388 | { |
| 389 | struct pcifront_device *pdev = data; |
| 390 | int i; |
| 391 | struct resource *r; |
| 392 | |
| 393 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { |
| 394 | r = &dev->resource[i]; |
| 395 | |
| 396 | if (!r->parent && r->start && r->flags) { |
| 397 | dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n", |
| 398 | pci_name(dev), i); |
| 399 | if (pci_claim_resource(dev, i)) { |
Konrad Rzeszutek Wilk | 917e3e6 | 2011-07-22 12:18:43 -0400 | [diff] [blame] | 400 | dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! " |
| 401 | "Device offline. Try using e820_host=1 in the guest config.\n", |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 402 | pci_name(dev), i); |
| 403 | } |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | return 0; |
| 408 | } |
| 409 | |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 410 | static int pcifront_scan_bus(struct pcifront_device *pdev, |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 411 | unsigned int domain, unsigned int bus, |
| 412 | struct pci_bus *b) |
| 413 | { |
| 414 | struct pci_dev *d; |
| 415 | unsigned int devfn; |
| 416 | |
| 417 | /* Scan the bus for functions and add. |
| 418 | * We omit handling of PCI bridge attachment because pciback prevents |
| 419 | * bridges from being exported. |
| 420 | */ |
| 421 | for (devfn = 0; devfn < 0x100; devfn++) { |
| 422 | d = pci_get_slot(b, devfn); |
| 423 | if (d) { |
| 424 | /* Device is already known. */ |
| 425 | pci_dev_put(d); |
| 426 | continue; |
| 427 | } |
| 428 | |
| 429 | d = pci_scan_single_device(b, devfn); |
| 430 | if (d) |
| 431 | dev_info(&pdev->xdev->dev, "New device on " |
Konrad Rzeszutek Wilk | e4de866 | 2012-01-25 16:00:00 -0500 | [diff] [blame] | 432 | "%04x:%02x:%02x.%d found.\n", domain, bus, |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 433 | PCI_SLOT(devfn), PCI_FUNC(devfn)); |
| 434 | } |
| 435 | |
| 436 | return 0; |
| 437 | } |
| 438 | |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 439 | static int pcifront_scan_root(struct pcifront_device *pdev, |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 440 | unsigned int domain, unsigned int bus) |
| 441 | { |
| 442 | struct pci_bus *b; |
Arnd Bergmann | 515d425 | 2015-04-28 17:32:33 +0800 | [diff] [blame] | 443 | LIST_HEAD(resources); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 444 | struct pcifront_sd *sd = NULL; |
| 445 | struct pci_bus_entry *bus_entry = NULL; |
| 446 | int err = 0; |
Arnd Bergmann | 515d425 | 2015-04-28 17:32:33 +0800 | [diff] [blame] | 447 | static struct resource busn_res = { |
| 448 | .start = 0, |
| 449 | .end = 255, |
| 450 | .flags = IORESOURCE_BUS, |
| 451 | }; |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 452 | |
| 453 | #ifndef CONFIG_PCI_DOMAINS |
| 454 | if (domain != 0) { |
| 455 | dev_err(&pdev->xdev->dev, |
| 456 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); |
| 457 | dev_err(&pdev->xdev->dev, |
| 458 | "Please compile with CONFIG_PCI_DOMAINS\n"); |
| 459 | err = -EINVAL; |
| 460 | goto err_out; |
| 461 | } |
| 462 | #endif |
| 463 | |
| 464 | dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n", |
| 465 | domain, bus); |
| 466 | |
Konrad Rzeszutek Wilk | 4d8c8bd | 2016-02-11 16:10:26 -0500 | [diff] [blame] | 467 | bus_entry = kzalloc(sizeof(*bus_entry), GFP_KERNEL); |
| 468 | sd = kzalloc(sizeof(*sd), GFP_KERNEL); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 469 | if (!bus_entry || !sd) { |
| 470 | err = -ENOMEM; |
| 471 | goto err_out; |
| 472 | } |
Arnd Bergmann | 515d425 | 2015-04-28 17:32:33 +0800 | [diff] [blame] | 473 | pci_add_resource(&resources, &ioport_resource); |
| 474 | pci_add_resource(&resources, &iomem_resource); |
| 475 | pci_add_resource(&resources, &busn_res); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 476 | pcifront_init_sd(sd, domain, bus, pdev); |
| 477 | |
Rafael J. Wysocki | a83919e0 | 2014-01-10 15:29:19 +0100 | [diff] [blame] | 478 | pci_lock_rescan_remove(); |
| 479 | |
Arnd Bergmann | 515d425 | 2015-04-28 17:32:33 +0800 | [diff] [blame] | 480 | b = pci_scan_root_bus(&pdev->xdev->dev, bus, |
| 481 | &pcifront_bus_ops, sd, &resources); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 482 | if (!b) { |
| 483 | dev_err(&pdev->xdev->dev, |
| 484 | "Error creating PCI Frontend Bus!\n"); |
| 485 | err = -ENOMEM; |
Rafael J. Wysocki | a83919e0 | 2014-01-10 15:29:19 +0100 | [diff] [blame] | 486 | pci_unlock_rescan_remove(); |
Arnd Bergmann | 515d425 | 2015-04-28 17:32:33 +0800 | [diff] [blame] | 487 | pci_free_resource_list(&resources); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 488 | goto err_out; |
| 489 | } |
| 490 | |
| 491 | bus_entry->bus = b; |
| 492 | |
| 493 | list_add(&bus_entry->list, &pdev->root_buses); |
| 494 | |
Arnd Bergmann | 515d425 | 2015-04-28 17:32:33 +0800 | [diff] [blame] | 495 | /* pci_scan_root_bus skips devices which do not have a |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 496 | * devfn==0. The pcifront_scan_bus enumerates all devfn. */ |
| 497 | err = pcifront_scan_bus(pdev, domain, bus, b); |
| 498 | |
| 499 | /* Claim resources before going "live" with our devices */ |
| 500 | pci_walk_bus(b, pcifront_claim_resource, pdev); |
| 501 | |
| 502 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ |
| 503 | pci_bus_add_devices(b); |
| 504 | |
Rafael J. Wysocki | a83919e0 | 2014-01-10 15:29:19 +0100 | [diff] [blame] | 505 | pci_unlock_rescan_remove(); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 506 | return err; |
| 507 | |
| 508 | err_out: |
| 509 | kfree(bus_entry); |
| 510 | kfree(sd); |
| 511 | |
| 512 | return err; |
| 513 | } |
| 514 | |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 515 | static int pcifront_rescan_root(struct pcifront_device *pdev, |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 516 | unsigned int domain, unsigned int bus) |
| 517 | { |
| 518 | int err; |
| 519 | struct pci_bus *b; |
| 520 | |
| 521 | #ifndef CONFIG_PCI_DOMAINS |
| 522 | if (domain != 0) { |
| 523 | dev_err(&pdev->xdev->dev, |
| 524 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); |
| 525 | dev_err(&pdev->xdev->dev, |
| 526 | "Please compile with CONFIG_PCI_DOMAINS\n"); |
| 527 | return -EINVAL; |
| 528 | } |
| 529 | #endif |
| 530 | |
| 531 | dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n", |
| 532 | domain, bus); |
| 533 | |
| 534 | b = pci_find_bus(domain, bus); |
| 535 | if (!b) |
| 536 | /* If the bus is unknown, create it. */ |
| 537 | return pcifront_scan_root(pdev, domain, bus); |
| 538 | |
| 539 | err = pcifront_scan_bus(pdev, domain, bus, b); |
| 540 | |
| 541 | /* Claim resources before going "live" with our devices */ |
| 542 | pci_walk_bus(b, pcifront_claim_resource, pdev); |
| 543 | |
| 544 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ |
| 545 | pci_bus_add_devices(b); |
| 546 | |
| 547 | return err; |
| 548 | } |
| 549 | |
| 550 | static void free_root_bus_devs(struct pci_bus *bus) |
| 551 | { |
| 552 | struct pci_dev *dev; |
| 553 | |
| 554 | while (!list_empty(&bus->devices)) { |
| 555 | dev = container_of(bus->devices.next, struct pci_dev, |
| 556 | bus_list); |
Frederick Lawler | 7506dc7 | 2018-01-18 12:55:24 -0600 | [diff] [blame] | 557 | pci_dbg(dev, "removing device\n"); |
Yinghai Lu | 210647a | 2012-02-25 13:54:20 -0800 | [diff] [blame] | 558 | pci_stop_and_remove_bus_device(dev); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 559 | } |
| 560 | } |
| 561 | |
| 562 | static void pcifront_free_roots(struct pcifront_device *pdev) |
| 563 | { |
| 564 | struct pci_bus_entry *bus_entry, *t; |
| 565 | |
| 566 | dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n"); |
| 567 | |
Rafael J. Wysocki | a83919e0 | 2014-01-10 15:29:19 +0100 | [diff] [blame] | 568 | pci_lock_rescan_remove(); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 569 | list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) { |
| 570 | list_del(&bus_entry->list); |
| 571 | |
| 572 | free_root_bus_devs(bus_entry->bus); |
| 573 | |
| 574 | kfree(bus_entry->bus->sysdata); |
| 575 | |
| 576 | device_unregister(bus_entry->bus->bridge); |
| 577 | pci_remove_bus(bus_entry->bus); |
| 578 | |
| 579 | kfree(bus_entry); |
| 580 | } |
Rafael J. Wysocki | a83919e0 | 2014-01-10 15:29:19 +0100 | [diff] [blame] | 581 | pci_unlock_rescan_remove(); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 582 | } |
| 583 | |
| 584 | static pci_ers_result_t pcifront_common_process(int cmd, |
| 585 | struct pcifront_device *pdev, |
| 586 | pci_channel_state_t state) |
| 587 | { |
| 588 | pci_ers_result_t result; |
| 589 | struct pci_driver *pdrv; |
| 590 | int bus = pdev->sh_info->aer_op.bus; |
| 591 | int devfn = pdev->sh_info->aer_op.devfn; |
Sinan Kaya | dd34bb4 | 2017-12-19 00:37:55 -0500 | [diff] [blame] | 592 | int domain = pdev->sh_info->aer_op.domain; |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 593 | struct pci_dev *pcidev; |
| 594 | int flag = 0; |
| 595 | |
| 596 | dev_dbg(&pdev->xdev->dev, |
| 597 | "pcifront AER process: cmd %x (bus:%x, devfn%x)", |
| 598 | cmd, bus, devfn); |
| 599 | result = PCI_ERS_RESULT_NONE; |
| 600 | |
Sinan Kaya | dd34bb4 | 2017-12-19 00:37:55 -0500 | [diff] [blame] | 601 | pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 602 | if (!pcidev || !pcidev->driver) { |
Jiri Slaby | 2a63dd7 | 2010-11-04 15:31:30 +0100 | [diff] [blame] | 603 | dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n"); |
Markus Elfring | ff0387c | 2014-11-10 21:02:17 -0700 | [diff] [blame] | 604 | pci_dev_put(pcidev); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 605 | return result; |
| 606 | } |
| 607 | pdrv = pcidev->driver; |
| 608 | |
Alan Stern | 07d2514 | 2012-01-27 10:24:40 -0500 | [diff] [blame] | 609 | if (pdrv) { |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 610 | if (pdrv->err_handler && pdrv->err_handler->error_detected) { |
Frederick Lawler | 7506dc7 | 2018-01-18 12:55:24 -0600 | [diff] [blame] | 611 | pci_dbg(pcidev, "trying to call AER service\n"); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 612 | if (pcidev) { |
| 613 | flag = 1; |
| 614 | switch (cmd) { |
| 615 | case XEN_PCI_OP_aer_detected: |
| 616 | result = pdrv->err_handler-> |
| 617 | error_detected(pcidev, state); |
| 618 | break; |
| 619 | case XEN_PCI_OP_aer_mmio: |
| 620 | result = pdrv->err_handler-> |
| 621 | mmio_enabled(pcidev); |
| 622 | break; |
| 623 | case XEN_PCI_OP_aer_slotreset: |
| 624 | result = pdrv->err_handler-> |
| 625 | slot_reset(pcidev); |
| 626 | break; |
| 627 | case XEN_PCI_OP_aer_resume: |
| 628 | pdrv->err_handler->resume(pcidev); |
| 629 | break; |
| 630 | default: |
| 631 | dev_err(&pdev->xdev->dev, |
| 632 | "bad request in aer recovery " |
| 633 | "operation!\n"); |
| 634 | |
| 635 | } |
| 636 | } |
| 637 | } |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 638 | } |
| 639 | if (!flag) |
| 640 | result = PCI_ERS_RESULT_NONE; |
| 641 | |
| 642 | return result; |
| 643 | } |
| 644 | |
| 645 | |
| 646 | static void pcifront_do_aer(struct work_struct *data) |
| 647 | { |
| 648 | struct pcifront_device *pdev = |
| 649 | container_of(data, struct pcifront_device, op_work); |
| 650 | int cmd = pdev->sh_info->aer_op.cmd; |
| 651 | pci_channel_state_t state = |
| 652 | (pci_channel_state_t)pdev->sh_info->aer_op.err; |
| 653 | |
| 654 | /*If a pci_conf op is in progress, |
| 655 | we have to wait until it is done before service aer op*/ |
| 656 | dev_dbg(&pdev->xdev->dev, |
| 657 | "pcifront service aer bus %x devfn %x\n", |
| 658 | pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn); |
| 659 | |
| 660 | pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state); |
| 661 | |
| 662 | /* Post the operation to the guest. */ |
| 663 | wmb(); |
| 664 | clear_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags); |
| 665 | notify_remote_via_evtchn(pdev->evtchn); |
| 666 | |
| 667 | /*in case of we lost an aer request in four lines time_window*/ |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 668 | smp_mb__before_atomic(); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 669 | clear_bit(_PDEVB_op_active, &pdev->flags); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 670 | smp_mb__after_atomic(); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 671 | |
| 672 | schedule_pcifront_aer_op(pdev); |
| 673 | |
| 674 | } |
| 675 | |
| 676 | static irqreturn_t pcifront_handler_aer(int irq, void *dev) |
| 677 | { |
| 678 | struct pcifront_device *pdev = dev; |
| 679 | schedule_pcifront_aer_op(pdev); |
| 680 | return IRQ_HANDLED; |
| 681 | } |
Konrad Rzeszutek Wilk | 3d92532 | 2012-07-31 06:26:59 -0400 | [diff] [blame] | 682 | static int pcifront_connect_and_init_dma(struct pcifront_device *pdev) |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 683 | { |
| 684 | int err = 0; |
| 685 | |
| 686 | spin_lock(&pcifront_dev_lock); |
| 687 | |
| 688 | if (!pcifront_dev) { |
| 689 | dev_info(&pdev->xdev->dev, "Installing PCI frontend\n"); |
| 690 | pcifront_dev = pdev; |
Konrad Rzeszutek Wilk | 098b1ae | 2013-06-10 16:48:09 -0400 | [diff] [blame] | 691 | } else |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 692 | err = -EEXIST; |
Konrad Rzeszutek Wilk | 098b1ae | 2013-06-10 16:48:09 -0400 | [diff] [blame] | 693 | |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 694 | spin_unlock(&pcifront_dev_lock); |
| 695 | |
Christoph Hellwig | 2cbc277 | 2021-03-18 17:14:24 +0100 | [diff] [blame] | 696 | if (!err && !is_swiotlb_active()) { |
Konrad Rzeszutek Wilk | 3d92532 | 2012-07-31 06:26:59 -0400 | [diff] [blame] | 697 | err = pci_xen_swiotlb_init_late(); |
| 698 | if (err) |
| 699 | dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n"); |
| 700 | } |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 701 | return err; |
| 702 | } |
| 703 | |
| 704 | static void pcifront_disconnect(struct pcifront_device *pdev) |
| 705 | { |
| 706 | spin_lock(&pcifront_dev_lock); |
| 707 | |
| 708 | if (pdev == pcifront_dev) { |
| 709 | dev_info(&pdev->xdev->dev, |
| 710 | "Disconnecting PCI Frontend Buses\n"); |
| 711 | pcifront_dev = NULL; |
| 712 | } |
| 713 | |
| 714 | spin_unlock(&pcifront_dev_lock); |
| 715 | } |
| 716 | static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev) |
| 717 | { |
| 718 | struct pcifront_device *pdev; |
| 719 | |
| 720 | pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL); |
| 721 | if (pdev == NULL) |
| 722 | goto out; |
| 723 | |
| 724 | pdev->sh_info = |
| 725 | (struct xen_pci_sharedinfo *)__get_free_page(GFP_KERNEL); |
| 726 | if (pdev->sh_info == NULL) { |
| 727 | kfree(pdev); |
| 728 | pdev = NULL; |
| 729 | goto out; |
| 730 | } |
| 731 | pdev->sh_info->flags = 0; |
| 732 | |
| 733 | /*Flag for registering PV AER handler*/ |
| 734 | set_bit(_XEN_PCIB_AERHANDLER, (void *)&pdev->sh_info->flags); |
| 735 | |
| 736 | dev_set_drvdata(&xdev->dev, pdev); |
| 737 | pdev->xdev = xdev; |
| 738 | |
| 739 | INIT_LIST_HEAD(&pdev->root_buses); |
| 740 | |
| 741 | spin_lock_init(&pdev->sh_info_lock); |
| 742 | |
| 743 | pdev->evtchn = INVALID_EVTCHN; |
| 744 | pdev->gnt_ref = INVALID_GRANT_REF; |
| 745 | pdev->irq = -1; |
| 746 | |
| 747 | INIT_WORK(&pdev->op_work, pcifront_do_aer); |
| 748 | |
| 749 | dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n", |
| 750 | pdev, pdev->sh_info); |
| 751 | out: |
| 752 | return pdev; |
| 753 | } |
| 754 | |
| 755 | static void free_pdev(struct pcifront_device *pdev) |
| 756 | { |
| 757 | dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev); |
| 758 | |
| 759 | pcifront_free_roots(pdev); |
| 760 | |
Tejun Heo | db2e2e6 | 2011-01-24 15:43:03 +0100 | [diff] [blame] | 761 | cancel_work_sync(&pdev->op_work); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 762 | |
| 763 | if (pdev->irq >= 0) |
| 764 | unbind_from_irqhandler(pdev->irq, pdev); |
| 765 | |
| 766 | if (pdev->evtchn != INVALID_EVTCHN) |
| 767 | xenbus_free_evtchn(pdev->xdev, pdev->evtchn); |
| 768 | |
| 769 | if (pdev->gnt_ref != INVALID_GRANT_REF) |
| 770 | gnttab_end_foreign_access(pdev->gnt_ref, 0 /* r/w page */, |
| 771 | (unsigned long)pdev->sh_info); |
| 772 | else |
| 773 | free_page((unsigned long)pdev->sh_info); |
| 774 | |
| 775 | dev_set_drvdata(&pdev->xdev->dev, NULL); |
| 776 | |
| 777 | kfree(pdev); |
| 778 | } |
| 779 | |
| 780 | static int pcifront_publish_info(struct pcifront_device *pdev) |
| 781 | { |
| 782 | int err = 0; |
| 783 | struct xenbus_transaction trans; |
Wei Liu | ccc9d90 | 2015-04-03 14:44:59 +0800 | [diff] [blame] | 784 | grant_ref_t gref; |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 785 | |
Wei Liu | ccc9d90 | 2015-04-03 14:44:59 +0800 | [diff] [blame] | 786 | err = xenbus_grant_ring(pdev->xdev, pdev->sh_info, 1, &gref); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 787 | if (err < 0) |
| 788 | goto out; |
| 789 | |
Wei Liu | ccc9d90 | 2015-04-03 14:44:59 +0800 | [diff] [blame] | 790 | pdev->gnt_ref = gref; |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 791 | |
| 792 | err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn); |
| 793 | if (err) |
| 794 | goto out; |
| 795 | |
| 796 | err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer, |
| 797 | 0, "pcifront", pdev); |
| 798 | |
| 799 | if (err < 0) |
| 800 | return err; |
| 801 | |
| 802 | pdev->irq = err; |
| 803 | |
| 804 | do_publish: |
| 805 | err = xenbus_transaction_start(&trans); |
| 806 | if (err) { |
| 807 | xenbus_dev_fatal(pdev->xdev, err, |
| 808 | "Error writing configuration for backend " |
| 809 | "(start transaction)"); |
| 810 | goto out; |
| 811 | } |
| 812 | |
| 813 | err = xenbus_printf(trans, pdev->xdev->nodename, |
| 814 | "pci-op-ref", "%u", pdev->gnt_ref); |
| 815 | if (!err) |
| 816 | err = xenbus_printf(trans, pdev->xdev->nodename, |
| 817 | "event-channel", "%u", pdev->evtchn); |
| 818 | if (!err) |
| 819 | err = xenbus_printf(trans, pdev->xdev->nodename, |
| 820 | "magic", XEN_PCI_MAGIC); |
| 821 | |
| 822 | if (err) { |
| 823 | xenbus_transaction_end(trans, 1); |
| 824 | xenbus_dev_fatal(pdev->xdev, err, |
| 825 | "Error writing configuration for backend"); |
| 826 | goto out; |
| 827 | } else { |
| 828 | err = xenbus_transaction_end(trans, 0); |
| 829 | if (err == -EAGAIN) |
| 830 | goto do_publish; |
| 831 | else if (err) { |
| 832 | xenbus_dev_fatal(pdev->xdev, err, |
| 833 | "Error completing transaction " |
| 834 | "for backend"); |
| 835 | goto out; |
| 836 | } |
| 837 | } |
| 838 | |
| 839 | xenbus_switch_state(pdev->xdev, XenbusStateInitialised); |
| 840 | |
| 841 | dev_dbg(&pdev->xdev->dev, "publishing successful!\n"); |
| 842 | |
| 843 | out: |
| 844 | return err; |
| 845 | } |
| 846 | |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 847 | static int pcifront_try_connect(struct pcifront_device *pdev) |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 848 | { |
| 849 | int err = -EFAULT; |
| 850 | int i, num_roots, len; |
| 851 | char str[64]; |
| 852 | unsigned int domain, bus; |
| 853 | |
| 854 | |
| 855 | /* Only connect once */ |
| 856 | if (xenbus_read_driver_state(pdev->xdev->nodename) != |
| 857 | XenbusStateInitialised) |
| 858 | goto out; |
| 859 | |
Konrad Rzeszutek Wilk | 3d92532 | 2012-07-31 06:26:59 -0400 | [diff] [blame] | 860 | err = pcifront_connect_and_init_dma(pdev); |
Konrad Rzeszutek Wilk | 098b1ae | 2013-06-10 16:48:09 -0400 | [diff] [blame] | 861 | if (err && err != -EEXIST) { |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 862 | xenbus_dev_fatal(pdev->xdev, err, |
Konrad Rzeszutek Wilk | 3d92532 | 2012-07-31 06:26:59 -0400 | [diff] [blame] | 863 | "Error setting up PCI Frontend"); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 864 | goto out; |
| 865 | } |
| 866 | |
| 867 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, |
| 868 | "root_num", "%d", &num_roots); |
| 869 | if (err == -ENOENT) { |
| 870 | xenbus_dev_error(pdev->xdev, err, |
| 871 | "No PCI Roots found, trying 0000:00"); |
| 872 | err = pcifront_scan_root(pdev, 0, 0); |
Chen Gang | 23cf1d0 | 2014-10-06 11:04:45 +0800 | [diff] [blame] | 873 | if (err) { |
| 874 | xenbus_dev_fatal(pdev->xdev, err, |
| 875 | "Error scanning PCI root 0000:00"); |
| 876 | goto out; |
| 877 | } |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 878 | num_roots = 0; |
| 879 | } else if (err != 1) { |
| 880 | if (err == 0) |
| 881 | err = -EINVAL; |
| 882 | xenbus_dev_fatal(pdev->xdev, err, |
| 883 | "Error reading number of PCI roots"); |
| 884 | goto out; |
| 885 | } |
| 886 | |
| 887 | for (i = 0; i < num_roots; i++) { |
| 888 | len = snprintf(str, sizeof(str), "root-%d", i); |
| 889 | if (unlikely(len >= (sizeof(str) - 1))) { |
| 890 | err = -ENOMEM; |
| 891 | goto out; |
| 892 | } |
| 893 | |
| 894 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, |
| 895 | "%x:%x", &domain, &bus); |
| 896 | if (err != 2) { |
| 897 | if (err >= 0) |
| 898 | err = -EINVAL; |
| 899 | xenbus_dev_fatal(pdev->xdev, err, |
| 900 | "Error reading PCI root %d", i); |
| 901 | goto out; |
| 902 | } |
| 903 | |
| 904 | err = pcifront_scan_root(pdev, domain, bus); |
| 905 | if (err) { |
| 906 | xenbus_dev_fatal(pdev->xdev, err, |
| 907 | "Error scanning PCI root %04x:%02x", |
| 908 | domain, bus); |
| 909 | goto out; |
| 910 | } |
| 911 | } |
| 912 | |
| 913 | err = xenbus_switch_state(pdev->xdev, XenbusStateConnected); |
| 914 | |
| 915 | out: |
| 916 | return err; |
| 917 | } |
| 918 | |
| 919 | static int pcifront_try_disconnect(struct pcifront_device *pdev) |
| 920 | { |
| 921 | int err = 0; |
| 922 | enum xenbus_state prev_state; |
| 923 | |
| 924 | |
| 925 | prev_state = xenbus_read_driver_state(pdev->xdev->nodename); |
| 926 | |
| 927 | if (prev_state >= XenbusStateClosing) |
| 928 | goto out; |
| 929 | |
| 930 | if (prev_state == XenbusStateConnected) { |
| 931 | pcifront_free_roots(pdev); |
| 932 | pcifront_disconnect(pdev); |
| 933 | } |
| 934 | |
| 935 | err = xenbus_switch_state(pdev->xdev, XenbusStateClosed); |
| 936 | |
| 937 | out: |
| 938 | |
| 939 | return err; |
| 940 | } |
| 941 | |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 942 | static int pcifront_attach_devices(struct pcifront_device *pdev) |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 943 | { |
| 944 | int err = -EFAULT; |
| 945 | int i, num_roots, len; |
| 946 | unsigned int domain, bus; |
| 947 | char str[64]; |
| 948 | |
| 949 | if (xenbus_read_driver_state(pdev->xdev->nodename) != |
| 950 | XenbusStateReconfiguring) |
| 951 | goto out; |
| 952 | |
| 953 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, |
| 954 | "root_num", "%d", &num_roots); |
| 955 | if (err == -ENOENT) { |
| 956 | xenbus_dev_error(pdev->xdev, err, |
| 957 | "No PCI Roots found, trying 0000:00"); |
| 958 | err = pcifront_rescan_root(pdev, 0, 0); |
Chen Gang | 23cf1d0 | 2014-10-06 11:04:45 +0800 | [diff] [blame] | 959 | if (err) { |
| 960 | xenbus_dev_fatal(pdev->xdev, err, |
| 961 | "Error scanning PCI root 0000:00"); |
| 962 | goto out; |
| 963 | } |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 964 | num_roots = 0; |
| 965 | } else if (err != 1) { |
| 966 | if (err == 0) |
| 967 | err = -EINVAL; |
| 968 | xenbus_dev_fatal(pdev->xdev, err, |
| 969 | "Error reading number of PCI roots"); |
| 970 | goto out; |
| 971 | } |
| 972 | |
| 973 | for (i = 0; i < num_roots; i++) { |
| 974 | len = snprintf(str, sizeof(str), "root-%d", i); |
| 975 | if (unlikely(len >= (sizeof(str) - 1))) { |
| 976 | err = -ENOMEM; |
| 977 | goto out; |
| 978 | } |
| 979 | |
| 980 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, |
| 981 | "%x:%x", &domain, &bus); |
| 982 | if (err != 2) { |
| 983 | if (err >= 0) |
| 984 | err = -EINVAL; |
| 985 | xenbus_dev_fatal(pdev->xdev, err, |
| 986 | "Error reading PCI root %d", i); |
| 987 | goto out; |
| 988 | } |
| 989 | |
| 990 | err = pcifront_rescan_root(pdev, domain, bus); |
| 991 | if (err) { |
| 992 | xenbus_dev_fatal(pdev->xdev, err, |
| 993 | "Error scanning PCI root %04x:%02x", |
| 994 | domain, bus); |
| 995 | goto out; |
| 996 | } |
| 997 | } |
| 998 | |
| 999 | xenbus_switch_state(pdev->xdev, XenbusStateConnected); |
| 1000 | |
| 1001 | out: |
| 1002 | return err; |
| 1003 | } |
| 1004 | |
| 1005 | static int pcifront_detach_devices(struct pcifront_device *pdev) |
| 1006 | { |
| 1007 | int err = 0; |
| 1008 | int i, num_devs; |
| 1009 | unsigned int domain, bus, slot, func; |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1010 | struct pci_dev *pci_dev; |
| 1011 | char str[64]; |
| 1012 | |
| 1013 | if (xenbus_read_driver_state(pdev->xdev->nodename) != |
| 1014 | XenbusStateConnected) |
| 1015 | goto out; |
| 1016 | |
| 1017 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d", |
| 1018 | &num_devs); |
| 1019 | if (err != 1) { |
| 1020 | if (err >= 0) |
| 1021 | err = -EINVAL; |
| 1022 | xenbus_dev_fatal(pdev->xdev, err, |
| 1023 | "Error reading number of PCI devices"); |
| 1024 | goto out; |
| 1025 | } |
| 1026 | |
| 1027 | /* Find devices being detached and remove them. */ |
| 1028 | for (i = 0; i < num_devs; i++) { |
| 1029 | int l, state; |
| 1030 | l = snprintf(str, sizeof(str), "state-%d", i); |
| 1031 | if (unlikely(l >= (sizeof(str) - 1))) { |
| 1032 | err = -ENOMEM; |
| 1033 | goto out; |
| 1034 | } |
Juergen Gross | 58faf07 | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1035 | state = xenbus_read_unsigned(pdev->xdev->otherend, str, |
| 1036 | XenbusStateUnknown); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1037 | |
| 1038 | if (state != XenbusStateClosing) |
| 1039 | continue; |
| 1040 | |
| 1041 | /* Remove device. */ |
| 1042 | l = snprintf(str, sizeof(str), "vdev-%d", i); |
| 1043 | if (unlikely(l >= (sizeof(str) - 1))) { |
| 1044 | err = -ENOMEM; |
| 1045 | goto out; |
| 1046 | } |
| 1047 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, |
| 1048 | "%x:%x:%x.%x", &domain, &bus, &slot, &func); |
| 1049 | if (err != 4) { |
| 1050 | if (err >= 0) |
| 1051 | err = -EINVAL; |
| 1052 | xenbus_dev_fatal(pdev->xdev, err, |
| 1053 | "Error reading PCI device %d", i); |
| 1054 | goto out; |
| 1055 | } |
| 1056 | |
Jiang Liu | 2ccc246 | 2012-08-28 23:43:58 +0800 | [diff] [blame] | 1057 | pci_dev = pci_get_domain_bus_and_slot(domain, bus, |
| 1058 | PCI_DEVFN(slot, func)); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1059 | if (!pci_dev) { |
| 1060 | dev_dbg(&pdev->xdev->dev, |
Konrad Rzeszutek Wilk | e4de866 | 2012-01-25 16:00:00 -0500 | [diff] [blame] | 1061 | "Cannot get PCI device %04x:%02x:%02x.%d\n", |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1062 | domain, bus, slot, func); |
| 1063 | continue; |
| 1064 | } |
Rafael J. Wysocki | a83919e0 | 2014-01-10 15:29:19 +0100 | [diff] [blame] | 1065 | pci_lock_rescan_remove(); |
Yinghai Lu | 210647a | 2012-02-25 13:54:20 -0800 | [diff] [blame] | 1066 | pci_stop_and_remove_bus_device(pci_dev); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1067 | pci_dev_put(pci_dev); |
Rafael J. Wysocki | a83919e0 | 2014-01-10 15:29:19 +0100 | [diff] [blame] | 1068 | pci_unlock_rescan_remove(); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1069 | |
| 1070 | dev_dbg(&pdev->xdev->dev, |
Konrad Rzeszutek Wilk | e4de866 | 2012-01-25 16:00:00 -0500 | [diff] [blame] | 1071 | "PCI device %04x:%02x:%02x.%d removed.\n", |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1072 | domain, bus, slot, func); |
| 1073 | } |
| 1074 | |
| 1075 | err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring); |
| 1076 | |
| 1077 | out: |
| 1078 | return err; |
| 1079 | } |
| 1080 | |
Fabian Frederick | bd721ea | 2016-08-02 14:03:33 -0700 | [diff] [blame] | 1081 | static void __ref pcifront_backend_changed(struct xenbus_device *xdev, |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1082 | enum xenbus_state be_state) |
| 1083 | { |
| 1084 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); |
| 1085 | |
| 1086 | switch (be_state) { |
| 1087 | case XenbusStateUnknown: |
| 1088 | case XenbusStateInitialising: |
| 1089 | case XenbusStateInitWait: |
| 1090 | case XenbusStateInitialised: |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1091 | break; |
| 1092 | |
| 1093 | case XenbusStateConnected: |
| 1094 | pcifront_try_connect(pdev); |
| 1095 | break; |
| 1096 | |
David Vrabel | d5af64d | 2012-10-18 11:03:36 +0100 | [diff] [blame] | 1097 | case XenbusStateClosed: |
| 1098 | if (xdev->state == XenbusStateClosed) |
| 1099 | break; |
Gustavo A. R. Silva | df561f66 | 2020-08-23 17:36:59 -0500 | [diff] [blame] | 1100 | fallthrough; /* Missed the backend's CLOSING state */ |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1101 | case XenbusStateClosing: |
| 1102 | dev_warn(&xdev->dev, "backend going away!\n"); |
| 1103 | pcifront_try_disconnect(pdev); |
| 1104 | break; |
| 1105 | |
| 1106 | case XenbusStateReconfiguring: |
| 1107 | pcifront_detach_devices(pdev); |
| 1108 | break; |
| 1109 | |
| 1110 | case XenbusStateReconfigured: |
| 1111 | pcifront_attach_devices(pdev); |
| 1112 | break; |
| 1113 | } |
| 1114 | } |
| 1115 | |
| 1116 | static int pcifront_xenbus_probe(struct xenbus_device *xdev, |
| 1117 | const struct xenbus_device_id *id) |
| 1118 | { |
| 1119 | int err = 0; |
| 1120 | struct pcifront_device *pdev = alloc_pdev(xdev); |
| 1121 | |
| 1122 | if (pdev == NULL) { |
| 1123 | err = -ENOMEM; |
| 1124 | xenbus_dev_fatal(xdev, err, |
| 1125 | "Error allocating pcifront_device struct"); |
| 1126 | goto out; |
| 1127 | } |
| 1128 | |
| 1129 | err = pcifront_publish_info(pdev); |
| 1130 | if (err) |
| 1131 | free_pdev(pdev); |
| 1132 | |
| 1133 | out: |
| 1134 | return err; |
| 1135 | } |
| 1136 | |
| 1137 | static int pcifront_xenbus_remove(struct xenbus_device *xdev) |
| 1138 | { |
| 1139 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); |
| 1140 | if (pdev) |
| 1141 | free_pdev(pdev); |
| 1142 | |
| 1143 | return 0; |
| 1144 | } |
| 1145 | |
| 1146 | static const struct xenbus_device_id xenpci_ids[] = { |
| 1147 | {"pci"}, |
| 1148 | {""}, |
| 1149 | }; |
| 1150 | |
David Vrabel | 95afae4 | 2014-09-08 17:30:41 +0100 | [diff] [blame] | 1151 | static struct xenbus_driver xenpci_driver = { |
| 1152 | .name = "pcifront", |
| 1153 | .ids = xenpci_ids, |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1154 | .probe = pcifront_xenbus_probe, |
| 1155 | .remove = pcifront_xenbus_remove, |
| 1156 | .otherend_changed = pcifront_backend_changed, |
David Vrabel | 95afae4 | 2014-09-08 17:30:41 +0100 | [diff] [blame] | 1157 | }; |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1158 | |
| 1159 | static int __init pcifront_init(void) |
| 1160 | { |
| 1161 | if (!xen_pv_domain() || xen_initial_domain()) |
| 1162 | return -ENODEV; |
| 1163 | |
Konrad Rzeszutek Wilk | 51c71a3 | 2013-11-26 15:05:40 -0500 | [diff] [blame] | 1164 | if (!xen_has_pv_devices()) |
| 1165 | return -ENODEV; |
| 1166 | |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1167 | pci_frontend_registrar(1 /* enable */); |
| 1168 | |
Jan Beulich | 73db144 | 2011-12-22 09:08:13 +0000 | [diff] [blame] | 1169 | return xenbus_register_frontend(&xenpci_driver); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1170 | } |
| 1171 | |
| 1172 | static void __exit pcifront_cleanup(void) |
| 1173 | { |
Jan Beulich | 73db144 | 2011-12-22 09:08:13 +0000 | [diff] [blame] | 1174 | xenbus_unregister_driver(&xenpci_driver); |
Ryan Wilson | 956a920 | 2010-08-02 21:31:05 -0400 | [diff] [blame] | 1175 | pci_frontend_registrar(0 /* disable */); |
| 1176 | } |
| 1177 | module_init(pcifront_init); |
| 1178 | module_exit(pcifront_cleanup); |
| 1179 | |
| 1180 | MODULE_DESCRIPTION("Xen PCI passthrough frontend."); |
| 1181 | MODULE_LICENSE("GPL"); |
| 1182 | MODULE_ALIAS("xen:pci"); |