Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2006 Jake Moilanen <moilanen@austin.ibm.com>, IBM Corp. |
| 3 | * Copyright 2006-2007 Michael Ellerman, IBM Corp. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * as published by the Free Software Foundation; version 2 of the |
| 8 | * License. |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #include <linux/device.h> |
| 13 | #include <linux/irq.h> |
| 14 | #include <linux/msi.h> |
| 15 | |
| 16 | #include <asm/rtas.h> |
| 17 | #include <asm/hw_irq.h> |
| 18 | #include <asm/ppc-pci.h> |
| 19 | |
| 20 | static int query_token, change_token; |
| 21 | |
| 22 | #define RTAS_QUERY_FN 0 |
| 23 | #define RTAS_CHANGE_FN 1 |
| 24 | #define RTAS_RESET_FN 2 |
| 25 | #define RTAS_CHANGE_MSI_FN 3 |
| 26 | #define RTAS_CHANGE_MSIX_FN 4 |
| 27 | |
| 28 | static struct pci_dn *get_pdn(struct pci_dev *pdev) |
| 29 | { |
| 30 | struct device_node *dn; |
| 31 | struct pci_dn *pdn; |
| 32 | |
| 33 | dn = pci_device_to_OF_node(pdev); |
| 34 | if (!dn) { |
| 35 | dev_dbg(&pdev->dev, "rtas_msi: No OF device node\n"); |
| 36 | return NULL; |
| 37 | } |
| 38 | |
| 39 | pdn = PCI_DN(dn); |
| 40 | if (!pdn) { |
| 41 | dev_dbg(&pdev->dev, "rtas_msi: No PCI DN\n"); |
| 42 | return NULL; |
| 43 | } |
| 44 | |
| 45 | return pdn; |
| 46 | } |
| 47 | |
| 48 | /* RTAS Helpers */ |
| 49 | |
| 50 | static int rtas_change_msi(struct pci_dn *pdn, u32 func, u32 num_irqs) |
| 51 | { |
| 52 | u32 addr, seq_num, rtas_ret[3]; |
| 53 | unsigned long buid; |
| 54 | int rc; |
| 55 | |
| 56 | addr = rtas_config_addr(pdn->busno, pdn->devfn, 0); |
| 57 | buid = pdn->phb->buid; |
| 58 | |
| 59 | seq_num = 1; |
| 60 | do { |
| 61 | if (func == RTAS_CHANGE_MSI_FN || func == RTAS_CHANGE_MSIX_FN) |
| 62 | rc = rtas_call(change_token, 6, 4, rtas_ret, addr, |
| 63 | BUID_HI(buid), BUID_LO(buid), |
| 64 | func, num_irqs, seq_num); |
| 65 | else |
| 66 | rc = rtas_call(change_token, 6, 3, rtas_ret, addr, |
| 67 | BUID_HI(buid), BUID_LO(buid), |
| 68 | func, num_irqs, seq_num); |
| 69 | |
| 70 | seq_num = rtas_ret[1]; |
| 71 | } while (rtas_busy_delay(rc)); |
| 72 | |
Michael Ellerman | d385366 | 2007-09-20 16:36:50 +1000 | [diff] [blame] | 73 | /* |
Michael Ellerman | 6071ed0 | 2009-01-22 20:54:33 +0000 | [diff] [blame] | 74 | * If the RTAS call succeeded, return the number of irqs allocated. |
| 75 | * If not, make sure we return a negative error code. |
Michael Ellerman | d385366 | 2007-09-20 16:36:50 +1000 | [diff] [blame] | 76 | */ |
Michael Ellerman | 6071ed0 | 2009-01-22 20:54:33 +0000 | [diff] [blame] | 77 | if (rc == 0) |
| 78 | rc = rtas_ret[0]; |
| 79 | else if (rc > 0) |
| 80 | rc = -rc; |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 81 | |
Michael Ellerman | d385366 | 2007-09-20 16:36:50 +1000 | [diff] [blame] | 82 | pr_debug("rtas_msi: ibm,change_msi(func=%d,num=%d), got %d rc = %d\n", |
| 83 | func, num_irqs, rtas_ret[0], rc); |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 84 | |
| 85 | return rc; |
| 86 | } |
| 87 | |
| 88 | static void rtas_disable_msi(struct pci_dev *pdev) |
| 89 | { |
| 90 | struct pci_dn *pdn; |
| 91 | |
| 92 | pdn = get_pdn(pdev); |
| 93 | if (!pdn) |
| 94 | return; |
| 95 | |
Nishanth Aravamudan | 964a299 | 2011-03-03 15:41:02 +0000 | [diff] [blame] | 96 | /* |
| 97 | * disabling MSI with the explicit interface also disables MSI-X |
| 98 | */ |
| 99 | if (rtas_change_msi(pdn, RTAS_CHANGE_MSI_FN, 0) != 0) { |
| 100 | /* |
| 101 | * may have failed because explicit interface is not |
| 102 | * present |
| 103 | */ |
| 104 | if (rtas_change_msi(pdn, RTAS_CHANGE_FN, 0) != 0) { |
| 105 | pr_debug("rtas_msi: Setting MSIs to 0 failed!\n"); |
| 106 | } |
| 107 | } |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 108 | } |
| 109 | |
| 110 | static int rtas_query_irq_number(struct pci_dn *pdn, int offset) |
| 111 | { |
| 112 | u32 addr, rtas_ret[2]; |
| 113 | unsigned long buid; |
| 114 | int rc; |
| 115 | |
| 116 | addr = rtas_config_addr(pdn->busno, pdn->devfn, 0); |
| 117 | buid = pdn->phb->buid; |
| 118 | |
| 119 | do { |
| 120 | rc = rtas_call(query_token, 4, 3, rtas_ret, addr, |
| 121 | BUID_HI(buid), BUID_LO(buid), offset); |
| 122 | } while (rtas_busy_delay(rc)); |
| 123 | |
| 124 | if (rc) { |
| 125 | pr_debug("rtas_msi: error (%d) querying source number\n", rc); |
| 126 | return rc; |
| 127 | } |
| 128 | |
| 129 | return rtas_ret[0]; |
| 130 | } |
| 131 | |
| 132 | static void rtas_teardown_msi_irqs(struct pci_dev *pdev) |
| 133 | { |
| 134 | struct msi_desc *entry; |
| 135 | |
| 136 | list_for_each_entry(entry, &pdev->msi_list, list) { |
| 137 | if (entry->irq == NO_IRQ) |
| 138 | continue; |
| 139 | |
Thomas Gleixner | ec775d0 | 2011-03-25 16:45:20 +0100 | [diff] [blame] | 140 | irq_set_msi_desc(entry->irq, NULL); |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 141 | irq_dispose_mapping(entry->irq); |
| 142 | } |
| 143 | |
| 144 | rtas_disable_msi(pdev); |
| 145 | } |
| 146 | |
Michael Ellerman | 3a51c0c | 2009-01-22 20:54:31 +0000 | [diff] [blame] | 147 | static int check_req(struct pci_dev *pdev, int nvec, char *prop_name) |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 148 | { |
| 149 | struct device_node *dn; |
| 150 | struct pci_dn *pdn; |
| 151 | const u32 *req_msi; |
| 152 | |
| 153 | pdn = get_pdn(pdev); |
| 154 | if (!pdn) |
| 155 | return -ENODEV; |
| 156 | |
| 157 | dn = pdn->node; |
| 158 | |
Michael Ellerman | 3a51c0c | 2009-01-22 20:54:31 +0000 | [diff] [blame] | 159 | req_msi = of_get_property(dn, prop_name, NULL); |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 160 | if (!req_msi) { |
Michael Ellerman | 3a51c0c | 2009-01-22 20:54:31 +0000 | [diff] [blame] | 161 | pr_debug("rtas_msi: No %s on %s\n", prop_name, dn->full_name); |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 162 | return -ENOENT; |
| 163 | } |
| 164 | |
| 165 | if (*req_msi < nvec) { |
Michael Ellerman | 3a51c0c | 2009-01-22 20:54:31 +0000 | [diff] [blame] | 166 | pr_debug("rtas_msi: %s requests < %d MSIs\n", prop_name, nvec); |
Michael Ellerman | d523cc3 | 2009-02-17 00:18:49 +0000 | [diff] [blame] | 167 | |
| 168 | if (*req_msi == 0) /* Be paranoid */ |
| 169 | return -ENOSPC; |
| 170 | |
| 171 | return *req_msi; |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | return 0; |
| 175 | } |
| 176 | |
Michael Ellerman | 3a51c0c | 2009-01-22 20:54:31 +0000 | [diff] [blame] | 177 | static int check_req_msi(struct pci_dev *pdev, int nvec) |
| 178 | { |
| 179 | return check_req(pdev, nvec, "ibm,req#msi"); |
| 180 | } |
| 181 | |
| 182 | static int check_req_msix(struct pci_dev *pdev, int nvec) |
| 183 | { |
| 184 | return check_req(pdev, nvec, "ibm,req#msi-x"); |
| 185 | } |
| 186 | |
Michael Ellerman | 448e2ca | 2009-02-17 00:21:56 +0000 | [diff] [blame] | 187 | /* Quota calculation */ |
| 188 | |
| 189 | static struct device_node *find_pe_total_msi(struct pci_dev *dev, int *total) |
| 190 | { |
| 191 | struct device_node *dn; |
| 192 | const u32 *p; |
| 193 | |
| 194 | dn = of_node_get(pci_device_to_OF_node(dev)); |
| 195 | while (dn) { |
| 196 | p = of_get_property(dn, "ibm,pe-total-#msi", NULL); |
| 197 | if (p) { |
| 198 | pr_debug("rtas_msi: found prop on dn %s\n", |
| 199 | dn->full_name); |
| 200 | *total = *p; |
| 201 | return dn; |
| 202 | } |
| 203 | |
| 204 | dn = of_get_next_parent(dn); |
| 205 | } |
| 206 | |
| 207 | return NULL; |
| 208 | } |
| 209 | |
| 210 | static struct device_node *find_pe_dn(struct pci_dev *dev, int *total) |
| 211 | { |
| 212 | struct device_node *dn; |
Gavin Shan | 66523d9 | 2012-09-07 22:44:13 +0000 | [diff] [blame^] | 213 | struct eeh_dev *edev; |
Michael Ellerman | 448e2ca | 2009-02-17 00:21:56 +0000 | [diff] [blame] | 214 | |
| 215 | /* Found our PE and assume 8 at that point. */ |
| 216 | |
| 217 | dn = pci_device_to_OF_node(dev); |
| 218 | if (!dn) |
| 219 | return NULL; |
| 220 | |
Gavin Shan | 66523d9 | 2012-09-07 22:44:13 +0000 | [diff] [blame^] | 221 | /* Get the top level device in the PE */ |
| 222 | edev = of_node_to_eeh_dev(dn); |
| 223 | edev = list_first_entry(&edev->pe->edevs, struct eeh_dev, list); |
| 224 | dn = eeh_dev_to_of_node(edev); |
Michael Ellerman | 448e2ca | 2009-02-17 00:21:56 +0000 | [diff] [blame] | 225 | if (!dn) |
| 226 | return NULL; |
| 227 | |
| 228 | /* We actually want the parent */ |
| 229 | dn = of_get_parent(dn); |
| 230 | if (!dn) |
| 231 | return NULL; |
| 232 | |
| 233 | /* Hardcode of 8 for old firmwares */ |
| 234 | *total = 8; |
| 235 | pr_debug("rtas_msi: using PE dn %s\n", dn->full_name); |
| 236 | |
| 237 | return dn; |
| 238 | } |
| 239 | |
| 240 | struct msi_counts { |
| 241 | struct device_node *requestor; |
| 242 | int num_devices; |
| 243 | int request; |
| 244 | int quota; |
| 245 | int spare; |
| 246 | int over_quota; |
| 247 | }; |
| 248 | |
| 249 | static void *count_non_bridge_devices(struct device_node *dn, void *data) |
| 250 | { |
| 251 | struct msi_counts *counts = data; |
| 252 | const u32 *p; |
| 253 | u32 class; |
| 254 | |
| 255 | pr_debug("rtas_msi: counting %s\n", dn->full_name); |
| 256 | |
| 257 | p = of_get_property(dn, "class-code", NULL); |
| 258 | class = p ? *p : 0; |
| 259 | |
| 260 | if ((class >> 8) != PCI_CLASS_BRIDGE_PCI) |
| 261 | counts->num_devices++; |
| 262 | |
| 263 | return NULL; |
| 264 | } |
| 265 | |
| 266 | static void *count_spare_msis(struct device_node *dn, void *data) |
| 267 | { |
| 268 | struct msi_counts *counts = data; |
| 269 | const u32 *p; |
| 270 | int req; |
| 271 | |
| 272 | if (dn == counts->requestor) |
| 273 | req = counts->request; |
| 274 | else { |
| 275 | /* We don't know if a driver will try to use MSI or MSI-X, |
| 276 | * so we just have to punt and use the larger of the two. */ |
| 277 | req = 0; |
| 278 | p = of_get_property(dn, "ibm,req#msi", NULL); |
| 279 | if (p) |
| 280 | req = *p; |
| 281 | |
| 282 | p = of_get_property(dn, "ibm,req#msi-x", NULL); |
| 283 | if (p) |
| 284 | req = max(req, (int)*p); |
| 285 | } |
| 286 | |
| 287 | if (req < counts->quota) |
| 288 | counts->spare += counts->quota - req; |
| 289 | else if (req > counts->quota) |
| 290 | counts->over_quota++; |
| 291 | |
| 292 | return NULL; |
| 293 | } |
| 294 | |
| 295 | static int msi_quota_for_device(struct pci_dev *dev, int request) |
| 296 | { |
| 297 | struct device_node *pe_dn; |
| 298 | struct msi_counts counts; |
| 299 | int total; |
| 300 | |
| 301 | pr_debug("rtas_msi: calc quota for %s, request %d\n", pci_name(dev), |
| 302 | request); |
| 303 | |
| 304 | pe_dn = find_pe_total_msi(dev, &total); |
| 305 | if (!pe_dn) |
| 306 | pe_dn = find_pe_dn(dev, &total); |
| 307 | |
| 308 | if (!pe_dn) { |
| 309 | pr_err("rtas_msi: couldn't find PE for %s\n", pci_name(dev)); |
| 310 | goto out; |
| 311 | } |
| 312 | |
| 313 | pr_debug("rtas_msi: found PE %s\n", pe_dn->full_name); |
| 314 | |
| 315 | memset(&counts, 0, sizeof(struct msi_counts)); |
| 316 | |
| 317 | /* Work out how many devices we have below this PE */ |
| 318 | traverse_pci_devices(pe_dn, count_non_bridge_devices, &counts); |
| 319 | |
| 320 | if (counts.num_devices == 0) { |
| 321 | pr_err("rtas_msi: found 0 devices under PE for %s\n", |
| 322 | pci_name(dev)); |
| 323 | goto out; |
| 324 | } |
| 325 | |
| 326 | counts.quota = total / counts.num_devices; |
| 327 | if (request <= counts.quota) |
| 328 | goto out; |
| 329 | |
| 330 | /* else, we have some more calculating to do */ |
| 331 | counts.requestor = pci_device_to_OF_node(dev); |
| 332 | counts.request = request; |
| 333 | traverse_pci_devices(pe_dn, count_spare_msis, &counts); |
| 334 | |
| 335 | /* If the quota isn't an integer multiple of the total, we can |
| 336 | * use the remainder as spare MSIs for anyone that wants them. */ |
| 337 | counts.spare += total % counts.num_devices; |
| 338 | |
| 339 | /* Divide any spare by the number of over-quota requestors */ |
| 340 | if (counts.over_quota) |
| 341 | counts.quota += counts.spare / counts.over_quota; |
| 342 | |
| 343 | /* And finally clamp the request to the possibly adjusted quota */ |
| 344 | request = min(counts.quota, request); |
| 345 | |
| 346 | pr_debug("rtas_msi: request clamped to quota %d\n", request); |
| 347 | out: |
| 348 | of_node_put(pe_dn); |
| 349 | |
| 350 | return request; |
| 351 | } |
| 352 | |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 353 | static int rtas_msi_check_device(struct pci_dev *pdev, int nvec, int type) |
| 354 | { |
Michael Ellerman | 448e2ca | 2009-02-17 00:21:56 +0000 | [diff] [blame] | 355 | int quota, rc; |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 356 | |
Michael Ellerman | 448e2ca | 2009-02-17 00:21:56 +0000 | [diff] [blame] | 357 | if (type == PCI_CAP_ID_MSIX) |
| 358 | rc = check_req_msix(pdev, nvec); |
| 359 | else |
| 360 | rc = check_req_msi(pdev, nvec); |
| 361 | |
| 362 | if (rc) |
| 363 | return rc; |
| 364 | |
| 365 | quota = msi_quota_for_device(pdev, nvec); |
| 366 | |
| 367 | if (quota && quota < nvec) |
| 368 | return quota; |
| 369 | |
| 370 | return 0; |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 371 | } |
| 372 | |
Michael Ellerman | 94afa5a | 2009-03-05 14:44:26 +0000 | [diff] [blame] | 373 | static int check_msix_entries(struct pci_dev *pdev) |
| 374 | { |
| 375 | struct msi_desc *entry; |
| 376 | int expected; |
| 377 | |
| 378 | /* There's no way for us to express to firmware that we want |
| 379 | * a discontiguous, or non-zero based, range of MSI-X entries. |
| 380 | * So we must reject such requests. */ |
| 381 | |
| 382 | expected = 0; |
| 383 | list_for_each_entry(entry, &pdev->msi_list, list) { |
| 384 | if (entry->msi_attrib.entry_nr != expected) { |
| 385 | pr_debug("rtas_msi: bad MSI-X entries.\n"); |
| 386 | return -EINVAL; |
| 387 | } |
| 388 | expected++; |
| 389 | } |
| 390 | |
| 391 | return 0; |
| 392 | } |
| 393 | |
Anton Blanchard | 752f521 | 2012-06-04 16:47:03 +0000 | [diff] [blame] | 394 | static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec_in, int type) |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 395 | { |
| 396 | struct pci_dn *pdn; |
| 397 | int hwirq, virq, i, rc; |
| 398 | struct msi_desc *entry; |
Michael Ellerman | 1db3e89 | 2007-10-23 14:23:44 +1000 | [diff] [blame] | 399 | struct msi_msg msg; |
Anton Blanchard | 752f521 | 2012-06-04 16:47:03 +0000 | [diff] [blame] | 400 | int nvec = nvec_in; |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 401 | |
| 402 | pdn = get_pdn(pdev); |
| 403 | if (!pdn) |
| 404 | return -ENODEV; |
| 405 | |
Michael Ellerman | 94afa5a | 2009-03-05 14:44:26 +0000 | [diff] [blame] | 406 | if (type == PCI_CAP_ID_MSIX && check_msix_entries(pdev)) |
| 407 | return -EINVAL; |
| 408 | |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 409 | /* |
Anton Blanchard | 752f521 | 2012-06-04 16:47:03 +0000 | [diff] [blame] | 410 | * Firmware currently refuse any non power of two allocation |
| 411 | * so we round up if the quota will allow it. |
| 412 | */ |
| 413 | if (type == PCI_CAP_ID_MSIX) { |
| 414 | int m = roundup_pow_of_two(nvec); |
| 415 | int quota = msi_quota_for_device(pdev, m); |
| 416 | |
| 417 | if (quota >= m) |
| 418 | nvec = m; |
| 419 | } |
| 420 | |
| 421 | /* |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 422 | * Try the new more explicit firmware interface, if that fails fall |
| 423 | * back to the old interface. The old interface is known to never |
| 424 | * return MSI-Xs. |
| 425 | */ |
Anton Blanchard | 752f521 | 2012-06-04 16:47:03 +0000 | [diff] [blame] | 426 | again: |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 427 | if (type == PCI_CAP_ID_MSI) { |
| 428 | rc = rtas_change_msi(pdn, RTAS_CHANGE_MSI_FN, nvec); |
| 429 | |
Michael Ellerman | 6071ed0 | 2009-01-22 20:54:33 +0000 | [diff] [blame] | 430 | if (rc < 0) { |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 431 | pr_debug("rtas_msi: trying the old firmware call.\n"); |
| 432 | rc = rtas_change_msi(pdn, RTAS_CHANGE_FN, nvec); |
| 433 | } |
| 434 | } else |
| 435 | rc = rtas_change_msi(pdn, RTAS_CHANGE_MSIX_FN, nvec); |
| 436 | |
Michael Ellerman | 6071ed0 | 2009-01-22 20:54:33 +0000 | [diff] [blame] | 437 | if (rc != nvec) { |
Anton Blanchard | 752f521 | 2012-06-04 16:47:03 +0000 | [diff] [blame] | 438 | if (nvec != nvec_in) { |
| 439 | nvec = nvec_in; |
| 440 | goto again; |
| 441 | } |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 442 | pr_debug("rtas_msi: rtas_change_msi() failed\n"); |
Michael Ellerman | fcbe809 | 2007-09-20 16:36:48 +1000 | [diff] [blame] | 443 | return rc; |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 444 | } |
| 445 | |
| 446 | i = 0; |
| 447 | list_for_each_entry(entry, &pdev->msi_list, list) { |
Michael Ellerman | e27ed69 | 2009-01-22 20:54:31 +0000 | [diff] [blame] | 448 | hwirq = rtas_query_irq_number(pdn, i++); |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 449 | if (hwirq < 0) { |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 450 | pr_debug("rtas_msi: error (%d) getting hwirq\n", rc); |
Michael Ellerman | fcbe809 | 2007-09-20 16:36:48 +1000 | [diff] [blame] | 451 | return hwirq; |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 452 | } |
| 453 | |
| 454 | virq = irq_create_mapping(NULL, hwirq); |
| 455 | |
| 456 | if (virq == NO_IRQ) { |
| 457 | pr_debug("rtas_msi: Failed mapping hwirq %d\n", hwirq); |
Michael Ellerman | fcbe809 | 2007-09-20 16:36:48 +1000 | [diff] [blame] | 458 | return -ENOSPC; |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 459 | } |
| 460 | |
| 461 | dev_dbg(&pdev->dev, "rtas_msi: allocated virq %d\n", virq); |
Thomas Gleixner | ec775d0 | 2011-03-25 16:45:20 +0100 | [diff] [blame] | 462 | irq_set_msi_desc(virq, entry); |
Michael Ellerman | 1db3e89 | 2007-10-23 14:23:44 +1000 | [diff] [blame] | 463 | |
| 464 | /* Read config space back so we can restore after reset */ |
| 465 | read_msi_msg(virq, &msg); |
| 466 | entry->msg = msg; |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 467 | } |
| 468 | |
| 469 | return 0; |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 470 | } |
| 471 | |
| 472 | static void rtas_msi_pci_irq_fixup(struct pci_dev *pdev) |
| 473 | { |
| 474 | /* No LSI -> leave MSIs (if any) configured */ |
| 475 | if (pdev->irq == NO_IRQ) { |
| 476 | dev_dbg(&pdev->dev, "rtas_msi: no LSI, nothing to do.\n"); |
| 477 | return; |
| 478 | } |
| 479 | |
| 480 | /* No MSI -> MSIs can't have been assigned by fw, leave LSI */ |
Michael Ellerman | 649781f | 2009-01-22 20:54:32 +0000 | [diff] [blame] | 481 | if (check_req_msi(pdev, 1) && check_req_msix(pdev, 1)) { |
| 482 | dev_dbg(&pdev->dev, "rtas_msi: no req#msi/x, nothing to do.\n"); |
Michael Ellerman | 85f2bf9 | 2007-05-08 12:58:35 +1000 | [diff] [blame] | 483 | return; |
| 484 | } |
| 485 | |
| 486 | dev_dbg(&pdev->dev, "rtas_msi: disabling existing MSI.\n"); |
| 487 | rtas_disable_msi(pdev); |
| 488 | } |
| 489 | |
| 490 | static int rtas_msi_init(void) |
| 491 | { |
| 492 | query_token = rtas_token("ibm,query-interrupt-source-number"); |
| 493 | change_token = rtas_token("ibm,change-msi"); |
| 494 | |
| 495 | if ((query_token == RTAS_UNKNOWN_SERVICE) || |
| 496 | (change_token == RTAS_UNKNOWN_SERVICE)) { |
| 497 | pr_debug("rtas_msi: no RTAS tokens, no MSI support.\n"); |
| 498 | return -1; |
| 499 | } |
| 500 | |
| 501 | pr_debug("rtas_msi: Registering RTAS MSI callbacks.\n"); |
| 502 | |
| 503 | WARN_ON(ppc_md.setup_msi_irqs); |
| 504 | ppc_md.setup_msi_irqs = rtas_setup_msi_irqs; |
| 505 | ppc_md.teardown_msi_irqs = rtas_teardown_msi_irqs; |
| 506 | ppc_md.msi_check_device = rtas_msi_check_device; |
| 507 | |
| 508 | WARN_ON(ppc_md.pci_irq_fixup); |
| 509 | ppc_md.pci_irq_fixup = rtas_msi_pci_irq_fixup; |
| 510 | |
| 511 | return 0; |
| 512 | } |
| 513 | arch_initcall(rtas_msi_init); |