1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Intel I/OAT DMA Linux driver 4 * Copyright(c) 2004 - 2015 Intel Corporation. 5 */ 6 7 #include <linux/init.h> 8 #include <linux/module.h> 9 #include <linux/slab.h> 10 #include <linux/pci.h> 11 #include <linux/interrupt.h> 12 #include <linux/dmaengine.h> 13 #include <linux/delay.h> 14 #include <linux/dma-mapping.h> 15 #include <linux/workqueue.h> 16 #include <linux/prefetch.h> 17 #include <linux/dca.h> 18 #include <linux/sizes.h> 19 #include "dma.h" 20 #include "registers.h" 21 #include "hw.h" 22 23 #include "../dmaengine.h" 24 25 MODULE_VERSION(IOAT_DMA_VERSION); 26 MODULE_LICENSE("Dual BSD/GPL"); 27 MODULE_AUTHOR("Intel Corporation"); 28 29 static const struct pci_device_id ioat_pci_tbl[] = { 30 /* I/OAT v3 platforms */ 31 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) }, 32 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) }, 33 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) }, 34 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) }, 35 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) }, 36 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) }, 37 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) }, 38 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) }, 39 40 /* I/OAT v3.2 platforms */ 41 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) }, 42 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) }, 43 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) }, 44 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) }, 45 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) }, 46 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) }, 47 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) }, 48 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) }, 49 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) }, 50 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) }, 51 52 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB0) }, 53 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB1) }, 54 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB2) }, 55 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB3) }, 56 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB4) }, 57 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB5) }, 58 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB6) }, 59 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB7) }, 60 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB8) }, 61 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB9) }, 62 63 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB0) }, 64 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB1) }, 65 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB2) }, 66 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB3) }, 67 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB4) }, 68 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB5) }, 69 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB6) }, 70 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB7) }, 71 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB8) }, 72 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB9) }, 73 74 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW0) }, 75 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW1) }, 76 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW2) }, 77 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW3) }, 78 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW4) }, 79 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW5) }, 80 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW6) }, 81 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW7) }, 82 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW8) }, 83 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW9) }, 84 85 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX0) }, 86 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX1) }, 87 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX2) }, 88 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX3) }, 89 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX4) }, 90 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX5) }, 91 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX6) }, 92 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX7) }, 93 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX8) }, 94 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX9) }, 95 96 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SKX) }, 97 98 /* I/OAT v3.3 platforms */ 99 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD0) }, 100 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD1) }, 101 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD2) }, 102 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD3) }, 103 104 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE0) }, 105 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE1) }, 106 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE2) }, 107 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE3) }, 108 109 /* I/OAT v3.4 platforms */ 110 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_ICX) }, 111 112 { 0, } 113 }; 114 MODULE_DEVICE_TABLE(pci, ioat_pci_tbl); 115 116 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id); 117 static void ioat_remove(struct pci_dev *pdev); 118 static void 119 ioat_init_channel(struct ioatdma_device *ioat_dma, 120 struct ioatdma_chan *ioat_chan, int idx); 121 static void ioat_intr_quirk(struct ioatdma_device *ioat_dma); 122 static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma); 123 static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma); 124 125 static int ioat_dca_enabled = 1; 126 module_param(ioat_dca_enabled, int, 0644); 127 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)"); 128 int ioat_pending_level = 7; 129 module_param(ioat_pending_level, int, 0644); 130 MODULE_PARM_DESC(ioat_pending_level, 131 "high-water mark for pushing ioat descriptors (default: 7)"); 132 static char ioat_interrupt_style[32] = "msix"; 133 module_param_string(ioat_interrupt_style, ioat_interrupt_style, 134 sizeof(ioat_interrupt_style), 0644); 135 MODULE_PARM_DESC(ioat_interrupt_style, 136 "set ioat interrupt style: msix (default), msi, intx"); 137 138 struct kmem_cache *ioat_cache; 139 struct kmem_cache *ioat_sed_cache; 140 141 static bool is_jf_ioat(struct pci_dev *pdev) 142 { 143 switch (pdev->device) { 144 case PCI_DEVICE_ID_INTEL_IOAT_JSF0: 145 case PCI_DEVICE_ID_INTEL_IOAT_JSF1: 146 case PCI_DEVICE_ID_INTEL_IOAT_JSF2: 147 case PCI_DEVICE_ID_INTEL_IOAT_JSF3: 148 case PCI_DEVICE_ID_INTEL_IOAT_JSF4: 149 case PCI_DEVICE_ID_INTEL_IOAT_JSF5: 150 case PCI_DEVICE_ID_INTEL_IOAT_JSF6: 151 case PCI_DEVICE_ID_INTEL_IOAT_JSF7: 152 case PCI_DEVICE_ID_INTEL_IOAT_JSF8: 153 case PCI_DEVICE_ID_INTEL_IOAT_JSF9: 154 return true; 155 default: 156 return false; 157 } 158 } 159 160 static bool is_snb_ioat(struct pci_dev *pdev) 161 { 162 switch (pdev->device) { 163 case PCI_DEVICE_ID_INTEL_IOAT_SNB0: 164 case PCI_DEVICE_ID_INTEL_IOAT_SNB1: 165 case PCI_DEVICE_ID_INTEL_IOAT_SNB2: 166 case PCI_DEVICE_ID_INTEL_IOAT_SNB3: 167 case PCI_DEVICE_ID_INTEL_IOAT_SNB4: 168 case PCI_DEVICE_ID_INTEL_IOAT_SNB5: 169 case PCI_DEVICE_ID_INTEL_IOAT_SNB6: 170 case PCI_DEVICE_ID_INTEL_IOAT_SNB7: 171 case PCI_DEVICE_ID_INTEL_IOAT_SNB8: 172 case PCI_DEVICE_ID_INTEL_IOAT_SNB9: 173 return true; 174 default: 175 return false; 176 } 177 } 178 179 static bool is_ivb_ioat(struct pci_dev *pdev) 180 { 181 switch (pdev->device) { 182 case PCI_DEVICE_ID_INTEL_IOAT_IVB0: 183 case PCI_DEVICE_ID_INTEL_IOAT_IVB1: 184 case PCI_DEVICE_ID_INTEL_IOAT_IVB2: 185 case PCI_DEVICE_ID_INTEL_IOAT_IVB3: 186 case PCI_DEVICE_ID_INTEL_IOAT_IVB4: 187 case PCI_DEVICE_ID_INTEL_IOAT_IVB5: 188 case PCI_DEVICE_ID_INTEL_IOAT_IVB6: 189 case PCI_DEVICE_ID_INTEL_IOAT_IVB7: 190 case PCI_DEVICE_ID_INTEL_IOAT_IVB8: 191 case PCI_DEVICE_ID_INTEL_IOAT_IVB9: 192 return true; 193 default: 194 return false; 195 } 196 197 } 198 199 static bool is_hsw_ioat(struct pci_dev *pdev) 200 { 201 switch (pdev->device) { 202 case PCI_DEVICE_ID_INTEL_IOAT_HSW0: 203 case PCI_DEVICE_ID_INTEL_IOAT_HSW1: 204 case PCI_DEVICE_ID_INTEL_IOAT_HSW2: 205 case PCI_DEVICE_ID_INTEL_IOAT_HSW3: 206 case PCI_DEVICE_ID_INTEL_IOAT_HSW4: 207 case PCI_DEVICE_ID_INTEL_IOAT_HSW5: 208 case PCI_DEVICE_ID_INTEL_IOAT_HSW6: 209 case PCI_DEVICE_ID_INTEL_IOAT_HSW7: 210 case PCI_DEVICE_ID_INTEL_IOAT_HSW8: 211 case PCI_DEVICE_ID_INTEL_IOAT_HSW9: 212 return true; 213 default: 214 return false; 215 } 216 217 } 218 219 static bool is_bdx_ioat(struct pci_dev *pdev) 220 { 221 switch (pdev->device) { 222 case PCI_DEVICE_ID_INTEL_IOAT_BDX0: 223 case PCI_DEVICE_ID_INTEL_IOAT_BDX1: 224 case PCI_DEVICE_ID_INTEL_IOAT_BDX2: 225 case PCI_DEVICE_ID_INTEL_IOAT_BDX3: 226 case PCI_DEVICE_ID_INTEL_IOAT_BDX4: 227 case PCI_DEVICE_ID_INTEL_IOAT_BDX5: 228 case PCI_DEVICE_ID_INTEL_IOAT_BDX6: 229 case PCI_DEVICE_ID_INTEL_IOAT_BDX7: 230 case PCI_DEVICE_ID_INTEL_IOAT_BDX8: 231 case PCI_DEVICE_ID_INTEL_IOAT_BDX9: 232 return true; 233 default: 234 return false; 235 } 236 } 237 238 static inline bool is_skx_ioat(struct pci_dev *pdev) 239 { 240 return (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_SKX) ? true : false; 241 } 242 243 static bool is_xeon_cb32(struct pci_dev *pdev) 244 { 245 return is_jf_ioat(pdev) || is_snb_ioat(pdev) || is_ivb_ioat(pdev) || 246 is_hsw_ioat(pdev) || is_bdx_ioat(pdev) || is_skx_ioat(pdev); 247 } 248 249 bool is_bwd_ioat(struct pci_dev *pdev) 250 { 251 switch (pdev->device) { 252 case PCI_DEVICE_ID_INTEL_IOAT_BWD0: 253 case PCI_DEVICE_ID_INTEL_IOAT_BWD1: 254 case PCI_DEVICE_ID_INTEL_IOAT_BWD2: 255 case PCI_DEVICE_ID_INTEL_IOAT_BWD3: 256 /* even though not Atom, BDX-DE has same DMA silicon */ 257 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0: 258 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1: 259 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2: 260 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3: 261 return true; 262 default: 263 return false; 264 } 265 } 266 267 static bool is_bwd_noraid(struct pci_dev *pdev) 268 { 269 switch (pdev->device) { 270 case PCI_DEVICE_ID_INTEL_IOAT_BWD2: 271 case PCI_DEVICE_ID_INTEL_IOAT_BWD3: 272 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0: 273 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1: 274 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2: 275 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3: 276 return true; 277 default: 278 return false; 279 } 280 281 } 282 283 /* 284 * Perform a IOAT transaction to verify the HW works. 285 */ 286 #define IOAT_TEST_SIZE 2000 287 288 static void ioat_dma_test_callback(void *dma_async_param) 289 { 290 struct completion *cmp = dma_async_param; 291 292 complete(cmp); 293 } 294 295 /** 296 * ioat_dma_self_test - Perform a IOAT transaction to verify the HW works. 297 * @ioat_dma: dma device to be tested 298 */ 299 static int ioat_dma_self_test(struct ioatdma_device *ioat_dma) 300 { 301 int i; 302 u8 *src; 303 u8 *dest; 304 struct dma_device *dma = &ioat_dma->dma_dev; 305 struct device *dev = &ioat_dma->pdev->dev; 306 struct dma_chan *dma_chan; 307 struct dma_async_tx_descriptor *tx; 308 dma_addr_t dma_dest, dma_src; 309 dma_cookie_t cookie; 310 int err = 0; 311 struct completion cmp; 312 unsigned long tmo; 313 unsigned long flags; 314 315 src = kzalloc(IOAT_TEST_SIZE, GFP_KERNEL); 316 if (!src) 317 return -ENOMEM; 318 dest = kzalloc(IOAT_TEST_SIZE, GFP_KERNEL); 319 if (!dest) { 320 kfree(src); 321 return -ENOMEM; 322 } 323 324 /* Fill in src buffer */ 325 for (i = 0; i < IOAT_TEST_SIZE; i++) 326 src[i] = (u8)i; 327 328 /* Start copy, using first DMA channel */ 329 dma_chan = container_of(dma->channels.next, struct dma_chan, 330 device_node); 331 if (dma->device_alloc_chan_resources(dma_chan) < 1) { 332 dev_err(dev, "selftest cannot allocate chan resource\n"); 333 err = -ENODEV; 334 goto out; 335 } 336 337 dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE); 338 if (dma_mapping_error(dev, dma_src)) { 339 dev_err(dev, "mapping src buffer failed\n"); 340 err = -ENOMEM; 341 goto free_resources; 342 } 343 dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE); 344 if (dma_mapping_error(dev, dma_dest)) { 345 dev_err(dev, "mapping dest buffer failed\n"); 346 err = -ENOMEM; 347 goto unmap_src; 348 } 349 flags = DMA_PREP_INTERRUPT; 350 tx = ioat_dma->dma_dev.device_prep_dma_memcpy(dma_chan, dma_dest, 351 dma_src, IOAT_TEST_SIZE, 352 flags); 353 if (!tx) { 354 dev_err(dev, "Self-test prep failed, disabling\n"); 355 err = -ENODEV; 356 goto unmap_dma; 357 } 358 359 async_tx_ack(tx); 360 init_completion(&cmp); 361 tx->callback = ioat_dma_test_callback; 362 tx->callback_param = &cmp; 363 cookie = tx->tx_submit(tx); 364 if (cookie < 0) { 365 dev_err(dev, "Self-test setup failed, disabling\n"); 366 err = -ENODEV; 367 goto unmap_dma; 368 } 369 dma->device_issue_pending(dma_chan); 370 371 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); 372 373 if (tmo == 0 || 374 dma->device_tx_status(dma_chan, cookie, NULL) 375 != DMA_COMPLETE) { 376 dev_err(dev, "Self-test copy timed out, disabling\n"); 377 err = -ENODEV; 378 goto unmap_dma; 379 } 380 if (memcmp(src, dest, IOAT_TEST_SIZE)) { 381 dev_err(dev, "Self-test copy failed compare, disabling\n"); 382 err = -ENODEV; 383 goto unmap_dma; 384 } 385 386 unmap_dma: 387 dma_unmap_single(dev, dma_dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE); 388 unmap_src: 389 dma_unmap_single(dev, dma_src, IOAT_TEST_SIZE, DMA_TO_DEVICE); 390 free_resources: 391 dma->device_free_chan_resources(dma_chan); 392 out: 393 kfree(src); 394 kfree(dest); 395 return err; 396 } 397 398 /** 399 * ioat_dma_setup_interrupts - setup interrupt handler 400 * @ioat_dma: ioat dma device 401 */ 402 int ioat_dma_setup_interrupts(struct ioatdma_device *ioat_dma) 403 { 404 struct ioatdma_chan *ioat_chan; 405 struct pci_dev *pdev = ioat_dma->pdev; 406 struct device *dev = &pdev->dev; 407 struct msix_entry *msix; 408 int i, j, msixcnt; 409 int err = -EINVAL; 410 u8 intrctrl = 0; 411 412 if (!strcmp(ioat_interrupt_style, "msix")) 413 goto msix; 414 if (!strcmp(ioat_interrupt_style, "msi")) 415 goto msi; 416 if (!strcmp(ioat_interrupt_style, "intx")) 417 goto intx; 418 dev_err(dev, "invalid ioat_interrupt_style %s\n", ioat_interrupt_style); 419 goto err_no_irq; 420 421 msix: 422 /* The number of MSI-X vectors should equal the number of channels */ 423 msixcnt = ioat_dma->chancnt; 424 for (i = 0; i < msixcnt; i++) 425 ioat_dma->msix_entries[i].entry = i; 426 427 err = pci_enable_msix_exact(pdev, ioat_dma->msix_entries, msixcnt); 428 if (err) 429 goto msi; 430 431 for (i = 0; i < msixcnt; i++) { 432 msix = &ioat_dma->msix_entries[i]; 433 ioat_chan = ioat_chan_by_index(ioat_dma, i); 434 err = devm_request_irq(dev, msix->vector, 435 ioat_dma_do_interrupt_msix, 0, 436 "ioat-msix", ioat_chan); 437 if (err) { 438 for (j = 0; j < i; j++) { 439 msix = &ioat_dma->msix_entries[j]; 440 ioat_chan = ioat_chan_by_index(ioat_dma, j); 441 devm_free_irq(dev, msix->vector, ioat_chan); 442 } 443 goto msi; 444 } 445 } 446 intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL; 447 ioat_dma->irq_mode = IOAT_MSIX; 448 goto done; 449 450 msi: 451 err = pci_enable_msi(pdev); 452 if (err) 453 goto intx; 454 455 err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, 0, 456 "ioat-msi", ioat_dma); 457 if (err) { 458 pci_disable_msi(pdev); 459 goto intx; 460 } 461 ioat_dma->irq_mode = IOAT_MSI; 462 goto done; 463 464 intx: 465 err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, 466 IRQF_SHARED, "ioat-intx", ioat_dma); 467 if (err) 468 goto err_no_irq; 469 470 ioat_dma->irq_mode = IOAT_INTX; 471 done: 472 if (is_bwd_ioat(pdev)) 473 ioat_intr_quirk(ioat_dma); 474 intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN; 475 writeb(intrctrl, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET); 476 return 0; 477 478 err_no_irq: 479 /* Disable all interrupt generation */ 480 writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET); 481 ioat_dma->irq_mode = IOAT_NOIRQ; 482 dev_err(dev, "no usable interrupts\n"); 483 return err; 484 } 485 486 static void ioat_disable_interrupts(struct ioatdma_device *ioat_dma) 487 { 488 /* Disable all interrupt generation */ 489 writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET); 490 } 491 492 static int ioat_probe(struct ioatdma_device *ioat_dma) 493 { 494 int err = -ENODEV; 495 struct dma_device *dma = &ioat_dma->dma_dev; 496 struct pci_dev *pdev = ioat_dma->pdev; 497 struct device *dev = &pdev->dev; 498 499 ioat_dma->completion_pool = dma_pool_create("completion_pool", dev, 500 sizeof(u64), 501 SMP_CACHE_BYTES, 502 SMP_CACHE_BYTES); 503 504 if (!ioat_dma->completion_pool) { 505 err = -ENOMEM; 506 goto err_out; 507 } 508 509 ioat_enumerate_channels(ioat_dma); 510 511 dma_cap_set(DMA_MEMCPY, dma->cap_mask); 512 dma->dev = &pdev->dev; 513 514 if (!ioat_dma->chancnt) { 515 dev_err(dev, "channel enumeration error\n"); 516 goto err_setup_interrupts; 517 } 518 519 err = ioat_dma_setup_interrupts(ioat_dma); 520 if (err) 521 goto err_setup_interrupts; 522 523 err = ioat3_dma_self_test(ioat_dma); 524 if (err) 525 goto err_self_test; 526 527 return 0; 528 529 err_self_test: 530 ioat_disable_interrupts(ioat_dma); 531 err_setup_interrupts: 532 dma_pool_destroy(ioat_dma->completion_pool); 533 err_out: 534 return err; 535 } 536 537 static int ioat_register(struct ioatdma_device *ioat_dma) 538 { 539 int err = dma_async_device_register(&ioat_dma->dma_dev); 540 541 if (err) { 542 ioat_disable_interrupts(ioat_dma); 543 dma_pool_destroy(ioat_dma->completion_pool); 544 } 545 546 return err; 547 } 548 549 static void ioat_dma_remove(struct ioatdma_device *ioat_dma) 550 { 551 struct dma_device *dma = &ioat_dma->dma_dev; 552 553 ioat_disable_interrupts(ioat_dma); 554 555 ioat_kobject_del(ioat_dma); 556 557 dma_async_device_unregister(dma); 558 } 559 560 /** 561 * ioat_enumerate_channels - find and initialize the device's channels 562 * @ioat_dma: the ioat dma device to be enumerated 563 */ 564 static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma) 565 { 566 struct ioatdma_chan *ioat_chan; 567 struct device *dev = &ioat_dma->pdev->dev; 568 struct dma_device *dma = &ioat_dma->dma_dev; 569 u8 xfercap_log; 570 int chancnt; 571 int i; 572 573 INIT_LIST_HEAD(&dma->channels); 574 chancnt = readb(ioat_dma->reg_base + IOAT_CHANCNT_OFFSET); 575 chancnt &= 0x1f; /* bits [4:0] valid */ 576 if (chancnt > ARRAY_SIZE(ioat_dma->idx)) { 577 dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n", 578 chancnt, ARRAY_SIZE(ioat_dma->idx)); 579 chancnt = ARRAY_SIZE(ioat_dma->idx); 580 } 581 xfercap_log = readb(ioat_dma->reg_base + IOAT_XFERCAP_OFFSET); 582 xfercap_log &= 0x1f; /* bits [4:0] valid */ 583 if (xfercap_log == 0) 584 return; 585 dev_dbg(dev, "%s: xfercap = %d\n", __func__, 1 << xfercap_log); 586 587 for (i = 0; i < chancnt; i++) { 588 ioat_chan = kzalloc(sizeof(*ioat_chan), GFP_KERNEL); 589 if (!ioat_chan) 590 break; 591 592 ioat_init_channel(ioat_dma, ioat_chan, i); 593 ioat_chan->xfercap_log = xfercap_log; 594 spin_lock_init(&ioat_chan->prep_lock); 595 if (ioat_reset_hw(ioat_chan)) { 596 i = 0; 597 break; 598 } 599 } 600 ioat_dma->chancnt = i; 601 } 602 603 /** 604 * ioat_free_chan_resources - release all the descriptors 605 * @c: the channel to be cleaned 606 */ 607 static void ioat_free_chan_resources(struct dma_chan *c) 608 { 609 struct ioatdma_chan *ioat_chan = to_ioat_chan(c); 610 struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma; 611 struct ioat_ring_ent *desc; 612 const int total_descs = 1 << ioat_chan->alloc_order; 613 int descs; 614 int i; 615 616 /* Before freeing channel resources first check 617 * if they have been previously allocated for this channel. 618 */ 619 if (!ioat_chan->ring) 620 return; 621 622 ioat_stop(ioat_chan); 623 624 if (!test_bit(IOAT_CHAN_DOWN, &ioat_chan->state)) { 625 ioat_reset_hw(ioat_chan); 626 627 /* Put LTR to idle */ 628 if (ioat_dma->version >= IOAT_VER_3_4) 629 writeb(IOAT_CHAN_LTR_SWSEL_IDLE, 630 ioat_chan->reg_base + 631 IOAT_CHAN_LTR_SWSEL_OFFSET); 632 } 633 634 spin_lock_bh(&ioat_chan->cleanup_lock); 635 spin_lock_bh(&ioat_chan->prep_lock); 636 descs = ioat_ring_space(ioat_chan); 637 dev_dbg(to_dev(ioat_chan), "freeing %d idle descriptors\n", descs); 638 for (i = 0; i < descs; i++) { 639 desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head + i); 640 ioat_free_ring_ent(desc, c); 641 } 642 643 if (descs < total_descs) 644 dev_err(to_dev(ioat_chan), "Freeing %d in use descriptors!\n", 645 total_descs - descs); 646 647 for (i = 0; i < total_descs - descs; i++) { 648 desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail + i); 649 dump_desc_dbg(ioat_chan, desc); 650 ioat_free_ring_ent(desc, c); 651 } 652 653 for (i = 0; i < ioat_chan->desc_chunks; i++) { 654 dma_free_coherent(to_dev(ioat_chan), IOAT_CHUNK_SIZE, 655 ioat_chan->descs[i].virt, 656 ioat_chan->descs[i].hw); 657 ioat_chan->descs[i].virt = NULL; 658 ioat_chan->descs[i].hw = 0; 659 } 660 ioat_chan->desc_chunks = 0; 661 662 kfree(ioat_chan->ring); 663 ioat_chan->ring = NULL; 664 ioat_chan->alloc_order = 0; 665 dma_pool_free(ioat_dma->completion_pool, ioat_chan->completion, 666 ioat_chan->completion_dma); 667 spin_unlock_bh(&ioat_chan->prep_lock); 668 spin_unlock_bh(&ioat_chan->cleanup_lock); 669 670 ioat_chan->last_completion = 0; 671 ioat_chan->completion_dma = 0; 672 ioat_chan->dmacount = 0; 673 } 674 675 /* ioat_alloc_chan_resources - allocate/initialize ioat descriptor ring 676 * @chan: channel to be initialized 677 */ 678 static int ioat_alloc_chan_resources(struct dma_chan *c) 679 { 680 struct ioatdma_chan *ioat_chan = to_ioat_chan(c); 681 struct ioat_ring_ent **ring; 682 u64 status; 683 int order; 684 int i = 0; 685 u32 chanerr; 686 687 /* have we already been set up? */ 688 if (ioat_chan->ring) 689 return 1 << ioat_chan->alloc_order; 690 691 /* Setup register to interrupt and write completion status on error */ 692 writew(IOAT_CHANCTRL_RUN, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET); 693 694 /* allocate a completion writeback area */ 695 /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ 696 ioat_chan->completion = 697 dma_pool_zalloc(ioat_chan->ioat_dma->completion_pool, 698 GFP_NOWAIT, &ioat_chan->completion_dma); 699 if (!ioat_chan->completion) 700 return -ENOMEM; 701 702 writel(((u64)ioat_chan->completion_dma) & 0x00000000FFFFFFFF, 703 ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); 704 writel(((u64)ioat_chan->completion_dma) >> 32, 705 ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); 706 707 order = IOAT_MAX_ORDER; 708 ring = ioat_alloc_ring(c, order, GFP_NOWAIT); 709 if (!ring) 710 return -ENOMEM; 711 712 spin_lock_bh(&ioat_chan->cleanup_lock); 713 spin_lock_bh(&ioat_chan->prep_lock); 714 ioat_chan->ring = ring; 715 ioat_chan->head = 0; 716 ioat_chan->issued = 0; 717 ioat_chan->tail = 0; 718 ioat_chan->alloc_order = order; 719 set_bit(IOAT_RUN, &ioat_chan->state); 720 spin_unlock_bh(&ioat_chan->prep_lock); 721 spin_unlock_bh(&ioat_chan->cleanup_lock); 722 723 /* Setting up LTR values for 3.4 or later */ 724 if (ioat_chan->ioat_dma->version >= IOAT_VER_3_4) { 725 u32 lat_val; 726 727 lat_val = IOAT_CHAN_LTR_ACTIVE_SNVAL | 728 IOAT_CHAN_LTR_ACTIVE_SNLATSCALE | 729 IOAT_CHAN_LTR_ACTIVE_SNREQMNT; 730 writel(lat_val, ioat_chan->reg_base + 731 IOAT_CHAN_LTR_ACTIVE_OFFSET); 732 733 lat_val = IOAT_CHAN_LTR_IDLE_SNVAL | 734 IOAT_CHAN_LTR_IDLE_SNLATSCALE | 735 IOAT_CHAN_LTR_IDLE_SNREQMNT; 736 writel(lat_val, ioat_chan->reg_base + 737 IOAT_CHAN_LTR_IDLE_OFFSET); 738 739 /* Select to active */ 740 writeb(IOAT_CHAN_LTR_SWSEL_ACTIVE, 741 ioat_chan->reg_base + 742 IOAT_CHAN_LTR_SWSEL_OFFSET); 743 } 744 745 ioat_start_null_desc(ioat_chan); 746 747 /* check that we got off the ground */ 748 do { 749 udelay(1); 750 status = ioat_chansts(ioat_chan); 751 } while (i++ < 20 && !is_ioat_active(status) && !is_ioat_idle(status)); 752 753 if (is_ioat_active(status) || is_ioat_idle(status)) 754 return 1 << ioat_chan->alloc_order; 755 756 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); 757 758 dev_WARN(to_dev(ioat_chan), 759 "failed to start channel chanerr: %#x\n", chanerr); 760 ioat_free_chan_resources(c); 761 return -EFAULT; 762 } 763 764 /* common channel initialization */ 765 static void 766 ioat_init_channel(struct ioatdma_device *ioat_dma, 767 struct ioatdma_chan *ioat_chan, int idx) 768 { 769 struct dma_device *dma = &ioat_dma->dma_dev; 770 771 ioat_chan->ioat_dma = ioat_dma; 772 ioat_chan->reg_base = ioat_dma->reg_base + (0x80 * (idx + 1)); 773 spin_lock_init(&ioat_chan->cleanup_lock); 774 ioat_chan->dma_chan.device = dma; 775 dma_cookie_init(&ioat_chan->dma_chan); 776 list_add_tail(&ioat_chan->dma_chan.device_node, &dma->channels); 777 ioat_dma->idx[idx] = ioat_chan; 778 timer_setup(&ioat_chan->timer, ioat_timer_event, 0); 779 tasklet_setup(&ioat_chan->cleanup_task, ioat_cleanup_event); 780 } 781 782 #define IOAT_NUM_SRC_TEST 6 /* must be <= 8 */ 783 static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma) 784 { 785 int i, src_idx; 786 struct page *dest; 787 struct page *xor_srcs[IOAT_NUM_SRC_TEST]; 788 struct page *xor_val_srcs[IOAT_NUM_SRC_TEST + 1]; 789 dma_addr_t dma_srcs[IOAT_NUM_SRC_TEST + 1]; 790 dma_addr_t dest_dma; 791 struct dma_async_tx_descriptor *tx; 792 struct dma_chan *dma_chan; 793 dma_cookie_t cookie; 794 u8 cmp_byte = 0; 795 u32 cmp_word; 796 u32 xor_val_result; 797 int err = 0; 798 struct completion cmp; 799 unsigned long tmo; 800 struct device *dev = &ioat_dma->pdev->dev; 801 struct dma_device *dma = &ioat_dma->dma_dev; 802 u8 op = 0; 803 804 dev_dbg(dev, "%s\n", __func__); 805 806 if (!dma_has_cap(DMA_XOR, dma->cap_mask)) 807 return 0; 808 809 for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) { 810 xor_srcs[src_idx] = alloc_page(GFP_KERNEL); 811 if (!xor_srcs[src_idx]) { 812 while (src_idx--) 813 __free_page(xor_srcs[src_idx]); 814 return -ENOMEM; 815 } 816 } 817 818 dest = alloc_page(GFP_KERNEL); 819 if (!dest) { 820 while (src_idx--) 821 __free_page(xor_srcs[src_idx]); 822 return -ENOMEM; 823 } 824 825 /* Fill in src buffers */ 826 for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) { 827 u8 *ptr = page_address(xor_srcs[src_idx]); 828 829 for (i = 0; i < PAGE_SIZE; i++) 830 ptr[i] = (1 << src_idx); 831 } 832 833 for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) 834 cmp_byte ^= (u8) (1 << src_idx); 835 836 cmp_word = (cmp_byte << 24) | (cmp_byte << 16) | 837 (cmp_byte << 8) | cmp_byte; 838 839 memset(page_address(dest), 0, PAGE_SIZE); 840 841 dma_chan = container_of(dma->channels.next, struct dma_chan, 842 device_node); 843 if (dma->device_alloc_chan_resources(dma_chan) < 1) { 844 err = -ENODEV; 845 goto out; 846 } 847 848 /* test xor */ 849 op = IOAT_OP_XOR; 850 851 dest_dma = dma_map_page(dev, dest, 0, PAGE_SIZE, DMA_FROM_DEVICE); 852 if (dma_mapping_error(dev, dest_dma)) { 853 err = -ENOMEM; 854 goto free_resources; 855 } 856 857 for (i = 0; i < IOAT_NUM_SRC_TEST; i++) { 858 dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE, 859 DMA_TO_DEVICE); 860 if (dma_mapping_error(dev, dma_srcs[i])) { 861 err = -ENOMEM; 862 goto dma_unmap; 863 } 864 } 865 tx = dma->device_prep_dma_xor(dma_chan, dest_dma, dma_srcs, 866 IOAT_NUM_SRC_TEST, PAGE_SIZE, 867 DMA_PREP_INTERRUPT); 868 869 if (!tx) { 870 dev_err(dev, "Self-test xor prep failed\n"); 871 err = -ENODEV; 872 goto dma_unmap; 873 } 874 875 async_tx_ack(tx); 876 init_completion(&cmp); 877 tx->callback = ioat_dma_test_callback; 878 tx->callback_param = &cmp; 879 cookie = tx->tx_submit(tx); 880 if (cookie < 0) { 881 dev_err(dev, "Self-test xor setup failed\n"); 882 err = -ENODEV; 883 goto dma_unmap; 884 } 885 dma->device_issue_pending(dma_chan); 886 887 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); 888 889 if (tmo == 0 || 890 dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) { 891 dev_err(dev, "Self-test xor timed out\n"); 892 err = -ENODEV; 893 goto dma_unmap; 894 } 895 896 for (i = 0; i < IOAT_NUM_SRC_TEST; i++) 897 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE); 898 899 dma_sync_single_for_cpu(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); 900 for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) { 901 u32 *ptr = page_address(dest); 902 903 if (ptr[i] != cmp_word) { 904 dev_err(dev, "Self-test xor failed compare\n"); 905 err = -ENODEV; 906 goto free_resources; 907 } 908 } 909 dma_sync_single_for_device(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); 910 911 dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); 912 913 /* skip validate if the capability is not present */ 914 if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask)) 915 goto free_resources; 916 917 op = IOAT_OP_XOR_VAL; 918 919 /* validate the sources with the destintation page */ 920 for (i = 0; i < IOAT_NUM_SRC_TEST; i++) 921 xor_val_srcs[i] = xor_srcs[i]; 922 xor_val_srcs[i] = dest; 923 924 xor_val_result = 1; 925 926 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) { 927 dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE, 928 DMA_TO_DEVICE); 929 if (dma_mapping_error(dev, dma_srcs[i])) { 930 err = -ENOMEM; 931 goto dma_unmap; 932 } 933 } 934 tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs, 935 IOAT_NUM_SRC_TEST + 1, PAGE_SIZE, 936 &xor_val_result, DMA_PREP_INTERRUPT); 937 if (!tx) { 938 dev_err(dev, "Self-test zero prep failed\n"); 939 err = -ENODEV; 940 goto dma_unmap; 941 } 942 943 async_tx_ack(tx); 944 init_completion(&cmp); 945 tx->callback = ioat_dma_test_callback; 946 tx->callback_param = &cmp; 947 cookie = tx->tx_submit(tx); 948 if (cookie < 0) { 949 dev_err(dev, "Self-test zero setup failed\n"); 950 err = -ENODEV; 951 goto dma_unmap; 952 } 953 dma->device_issue_pending(dma_chan); 954 955 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); 956 957 if (tmo == 0 || 958 dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) { 959 dev_err(dev, "Self-test validate timed out\n"); 960 err = -ENODEV; 961 goto dma_unmap; 962 } 963 964 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) 965 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE); 966 967 if (xor_val_result != 0) { 968 dev_err(dev, "Self-test validate failed compare\n"); 969 err = -ENODEV; 970 goto free_resources; 971 } 972 973 memset(page_address(dest), 0, PAGE_SIZE); 974 975 /* test for non-zero parity sum */ 976 op = IOAT_OP_XOR_VAL; 977 978 xor_val_result = 0; 979 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) { 980 dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE, 981 DMA_TO_DEVICE); 982 if (dma_mapping_error(dev, dma_srcs[i])) { 983 err = -ENOMEM; 984 goto dma_unmap; 985 } 986 } 987 tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs, 988 IOAT_NUM_SRC_TEST + 1, PAGE_SIZE, 989 &xor_val_result, DMA_PREP_INTERRUPT); 990 if (!tx) { 991 dev_err(dev, "Self-test 2nd zero prep failed\n"); 992 err = -ENODEV; 993 goto dma_unmap; 994 } 995 996 async_tx_ack(tx); 997 init_completion(&cmp); 998 tx->callback = ioat_dma_test_callback; 999 tx->callback_param = &cmp; 1000 cookie = tx->tx_submit(tx); 1001 if (cookie < 0) { 1002 dev_err(dev, "Self-test 2nd zero setup failed\n"); 1003 err = -ENODEV; 1004 goto dma_unmap; 1005 } 1006 dma->device_issue_pending(dma_chan); 1007 1008 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); 1009 1010 if (tmo == 0 || 1011 dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) { 1012 dev_err(dev, "Self-test 2nd validate timed out\n"); 1013 err = -ENODEV; 1014 goto dma_unmap; 1015 } 1016 1017 if (xor_val_result != SUM_CHECK_P_RESULT) { 1018 dev_err(dev, "Self-test validate failed compare\n"); 1019 err = -ENODEV; 1020 goto dma_unmap; 1021 } 1022 1023 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) 1024 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE); 1025 1026 goto free_resources; 1027 dma_unmap: 1028 if (op == IOAT_OP_XOR) { 1029 while (--i >= 0) 1030 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, 1031 DMA_TO_DEVICE); 1032 dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); 1033 } else if (op == IOAT_OP_XOR_VAL) { 1034 while (--i >= 0) 1035 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, 1036 DMA_TO_DEVICE); 1037 } 1038 free_resources: 1039 dma->device_free_chan_resources(dma_chan); 1040 out: 1041 src_idx = IOAT_NUM_SRC_TEST; 1042 while (src_idx--) 1043 __free_page(xor_srcs[src_idx]); 1044 __free_page(dest); 1045 return err; 1046 } 1047 1048 static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma) 1049 { 1050 int rc; 1051 1052 rc = ioat_dma_self_test(ioat_dma); 1053 if (rc) 1054 return rc; 1055 1056 rc = ioat_xor_val_self_test(ioat_dma); 1057 1058 return rc; 1059 } 1060 1061 static void ioat_intr_quirk(struct ioatdma_device *ioat_dma) 1062 { 1063 struct dma_device *dma; 1064 struct dma_chan *c; 1065 struct ioatdma_chan *ioat_chan; 1066 u32 errmask; 1067 1068 dma = &ioat_dma->dma_dev; 1069 1070 /* 1071 * if we have descriptor write back error status, we mask the 1072 * error interrupts 1073 */ 1074 if (ioat_dma->cap & IOAT_CAP_DWBES) { 1075 list_for_each_entry(c, &dma->channels, device_node) { 1076 ioat_chan = to_ioat_chan(c); 1077 errmask = readl(ioat_chan->reg_base + 1078 IOAT_CHANERR_MASK_OFFSET); 1079 errmask |= IOAT_CHANERR_XOR_P_OR_CRC_ERR | 1080 IOAT_CHANERR_XOR_Q_ERR; 1081 writel(errmask, ioat_chan->reg_base + 1082 IOAT_CHANERR_MASK_OFFSET); 1083 } 1084 } 1085 } 1086 1087 static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca) 1088 { 1089 struct pci_dev *pdev = ioat_dma->pdev; 1090 int dca_en = system_has_dca_enabled(pdev); 1091 struct dma_device *dma; 1092 struct dma_chan *c; 1093 struct ioatdma_chan *ioat_chan; 1094 int err; 1095 u16 val16; 1096 1097 dma = &ioat_dma->dma_dev; 1098 dma->device_prep_dma_memcpy = ioat_dma_prep_memcpy_lock; 1099 dma->device_issue_pending = ioat_issue_pending; 1100 dma->device_alloc_chan_resources = ioat_alloc_chan_resources; 1101 dma->device_free_chan_resources = ioat_free_chan_resources; 1102 1103 dma_cap_set(DMA_INTERRUPT, dma->cap_mask); 1104 dma->device_prep_dma_interrupt = ioat_prep_interrupt_lock; 1105 1106 ioat_dma->cap = readl(ioat_dma->reg_base + IOAT_DMA_CAP_OFFSET); 1107 1108 if (is_xeon_cb32(pdev) || is_bwd_noraid(pdev)) 1109 ioat_dma->cap &= 1110 ~(IOAT_CAP_XOR | IOAT_CAP_PQ | IOAT_CAP_RAID16SS); 1111 1112 /* dca is incompatible with raid operations */ 1113 if (dca_en && (ioat_dma->cap & (IOAT_CAP_XOR|IOAT_CAP_PQ))) 1114 ioat_dma->cap &= ~(IOAT_CAP_XOR|IOAT_CAP_PQ); 1115 1116 if (ioat_dma->cap & IOAT_CAP_XOR) { 1117 dma->max_xor = 8; 1118 1119 dma_cap_set(DMA_XOR, dma->cap_mask); 1120 dma->device_prep_dma_xor = ioat_prep_xor; 1121 1122 dma_cap_set(DMA_XOR_VAL, dma->cap_mask); 1123 dma->device_prep_dma_xor_val = ioat_prep_xor_val; 1124 } 1125 1126 if (ioat_dma->cap & IOAT_CAP_PQ) { 1127 1128 dma->device_prep_dma_pq = ioat_prep_pq; 1129 dma->device_prep_dma_pq_val = ioat_prep_pq_val; 1130 dma_cap_set(DMA_PQ, dma->cap_mask); 1131 dma_cap_set(DMA_PQ_VAL, dma->cap_mask); 1132 1133 if (ioat_dma->cap & IOAT_CAP_RAID16SS) 1134 dma_set_maxpq(dma, 16, 0); 1135 else 1136 dma_set_maxpq(dma, 8, 0); 1137 1138 if (!(ioat_dma->cap & IOAT_CAP_XOR)) { 1139 dma->device_prep_dma_xor = ioat_prep_pqxor; 1140 dma->device_prep_dma_xor_val = ioat_prep_pqxor_val; 1141 dma_cap_set(DMA_XOR, dma->cap_mask); 1142 dma_cap_set(DMA_XOR_VAL, dma->cap_mask); 1143 1144 if (ioat_dma->cap & IOAT_CAP_RAID16SS) 1145 dma->max_xor = 16; 1146 else 1147 dma->max_xor = 8; 1148 } 1149 } 1150 1151 dma->device_tx_status = ioat_tx_status; 1152 1153 /* starting with CB3.3 super extended descriptors are supported */ 1154 if (ioat_dma->cap & IOAT_CAP_RAID16SS) { 1155 char pool_name[14]; 1156 int i; 1157 1158 for (i = 0; i < MAX_SED_POOLS; i++) { 1159 snprintf(pool_name, 14, "ioat_hw%d_sed", i); 1160 1161 /* allocate SED DMA pool */ 1162 ioat_dma->sed_hw_pool[i] = dmam_pool_create(pool_name, 1163 &pdev->dev, 1164 SED_SIZE * (i + 1), 64, 0); 1165 if (!ioat_dma->sed_hw_pool[i]) 1166 return -ENOMEM; 1167 1168 } 1169 } 1170 1171 if (!(ioat_dma->cap & (IOAT_CAP_XOR | IOAT_CAP_PQ))) 1172 dma_cap_set(DMA_PRIVATE, dma->cap_mask); 1173 1174 err = ioat_probe(ioat_dma); 1175 if (err) 1176 return err; 1177 1178 list_for_each_entry(c, &dma->channels, device_node) { 1179 ioat_chan = to_ioat_chan(c); 1180 writel(IOAT_DMA_DCA_ANY_CPU, 1181 ioat_chan->reg_base + IOAT_DCACTRL_OFFSET); 1182 } 1183 1184 err = ioat_register(ioat_dma); 1185 if (err) 1186 return err; 1187 1188 ioat_kobject_add(ioat_dma, &ioat_ktype); 1189 1190 if (dca) 1191 ioat_dma->dca = ioat_dca_init(pdev, ioat_dma->reg_base); 1192 1193 /* disable relaxed ordering */ 1194 err = pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &val16); 1195 if (err) 1196 return pcibios_err_to_errno(err); 1197 1198 /* clear relaxed ordering enable */ 1199 val16 &= ~PCI_EXP_DEVCTL_RELAX_EN; 1200 err = pcie_capability_write_word(pdev, PCI_EXP_DEVCTL, val16); 1201 if (err) 1202 return pcibios_err_to_errno(err); 1203 1204 if (ioat_dma->cap & IOAT_CAP_DPS) 1205 writeb(ioat_pending_level + 1, 1206 ioat_dma->reg_base + IOAT_PREFETCH_LIMIT_OFFSET); 1207 1208 return 0; 1209 } 1210 1211 static void ioat_shutdown(struct pci_dev *pdev) 1212 { 1213 struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev); 1214 struct ioatdma_chan *ioat_chan; 1215 int i; 1216 1217 if (!ioat_dma) 1218 return; 1219 1220 for (i = 0; i < IOAT_MAX_CHANS; i++) { 1221 ioat_chan = ioat_dma->idx[i]; 1222 if (!ioat_chan) 1223 continue; 1224 1225 spin_lock_bh(&ioat_chan->prep_lock); 1226 set_bit(IOAT_CHAN_DOWN, &ioat_chan->state); 1227 spin_unlock_bh(&ioat_chan->prep_lock); 1228 /* 1229 * Synchronization rule for del_timer_sync(): 1230 * - The caller must not hold locks which would prevent 1231 * completion of the timer's handler. 1232 * So prep_lock cannot be held before calling it. 1233 */ 1234 del_timer_sync(&ioat_chan->timer); 1235 1236 /* this should quiesce then reset */ 1237 ioat_reset_hw(ioat_chan); 1238 } 1239 1240 ioat_disable_interrupts(ioat_dma); 1241 } 1242 1243 static void ioat_resume(struct ioatdma_device *ioat_dma) 1244 { 1245 struct ioatdma_chan *ioat_chan; 1246 u32 chanerr; 1247 int i; 1248 1249 for (i = 0; i < IOAT_MAX_CHANS; i++) { 1250 ioat_chan = ioat_dma->idx[i]; 1251 if (!ioat_chan) 1252 continue; 1253 1254 spin_lock_bh(&ioat_chan->prep_lock); 1255 clear_bit(IOAT_CHAN_DOWN, &ioat_chan->state); 1256 spin_unlock_bh(&ioat_chan->prep_lock); 1257 1258 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); 1259 writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET); 1260 1261 /* no need to reset as shutdown already did that */ 1262 } 1263 } 1264 1265 #define DRV_NAME "ioatdma" 1266 1267 static pci_ers_result_t ioat_pcie_error_detected(struct pci_dev *pdev, 1268 pci_channel_state_t error) 1269 { 1270 dev_dbg(&pdev->dev, "%s: PCIe AER error %d\n", DRV_NAME, error); 1271 1272 /* quiesce and block I/O */ 1273 ioat_shutdown(pdev); 1274 1275 return PCI_ERS_RESULT_NEED_RESET; 1276 } 1277 1278 static pci_ers_result_t ioat_pcie_error_slot_reset(struct pci_dev *pdev) 1279 { 1280 pci_ers_result_t result = PCI_ERS_RESULT_RECOVERED; 1281 1282 dev_dbg(&pdev->dev, "%s post reset handling\n", DRV_NAME); 1283 1284 if (pci_enable_device_mem(pdev) < 0) { 1285 dev_err(&pdev->dev, 1286 "Failed to enable PCIe device after reset.\n"); 1287 result = PCI_ERS_RESULT_DISCONNECT; 1288 } else { 1289 pci_set_master(pdev); 1290 pci_restore_state(pdev); 1291 pci_save_state(pdev); 1292 pci_wake_from_d3(pdev, false); 1293 } 1294 1295 return result; 1296 } 1297 1298 static void ioat_pcie_error_resume(struct pci_dev *pdev) 1299 { 1300 struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev); 1301 1302 dev_dbg(&pdev->dev, "%s: AER handling resuming\n", DRV_NAME); 1303 1304 /* initialize and bring everything back */ 1305 ioat_resume(ioat_dma); 1306 } 1307 1308 static const struct pci_error_handlers ioat_err_handler = { 1309 .error_detected = ioat_pcie_error_detected, 1310 .slot_reset = ioat_pcie_error_slot_reset, 1311 .resume = ioat_pcie_error_resume, 1312 }; 1313 1314 static struct pci_driver ioat_pci_driver = { 1315 .name = DRV_NAME, 1316 .id_table = ioat_pci_tbl, 1317 .probe = ioat_pci_probe, 1318 .remove = ioat_remove, 1319 .shutdown = ioat_shutdown, 1320 .err_handler = &ioat_err_handler, 1321 }; 1322 1323 static void release_ioatdma(struct dma_device *device) 1324 { 1325 struct ioatdma_device *d = to_ioatdma_device(device); 1326 int i; 1327 1328 for (i = 0; i < IOAT_MAX_CHANS; i++) 1329 kfree(d->idx[i]); 1330 1331 dma_pool_destroy(d->completion_pool); 1332 kfree(d); 1333 } 1334 1335 static struct ioatdma_device * 1336 alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase) 1337 { 1338 struct ioatdma_device *d = kzalloc(sizeof(*d), GFP_KERNEL); 1339 1340 if (!d) 1341 return NULL; 1342 d->pdev = pdev; 1343 d->reg_base = iobase; 1344 d->dma_dev.device_release = release_ioatdma; 1345 return d; 1346 } 1347 1348 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 1349 { 1350 void __iomem * const *iomap; 1351 struct device *dev = &pdev->dev; 1352 struct ioatdma_device *device; 1353 int err; 1354 1355 err = pcim_enable_device(pdev); 1356 if (err) 1357 return err; 1358 1359 err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME); 1360 if (err) 1361 return err; 1362 iomap = pcim_iomap_table(pdev); 1363 if (!iomap) 1364 return -ENOMEM; 1365 1366 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); 1367 if (err) 1368 return err; 1369 1370 device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]); 1371 if (!device) 1372 return -ENOMEM; 1373 pci_set_master(pdev); 1374 pci_set_drvdata(pdev, device); 1375 1376 device->version = readb(device->reg_base + IOAT_VER_OFFSET); 1377 if (device->version >= IOAT_VER_3_4) 1378 ioat_dca_enabled = 0; 1379 if (device->version >= IOAT_VER_3_0) { 1380 if (is_skx_ioat(pdev)) 1381 device->version = IOAT_VER_3_2; 1382 err = ioat3_dma_probe(device, ioat_dca_enabled); 1383 } else 1384 return -ENODEV; 1385 1386 if (err) { 1387 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n"); 1388 return -ENODEV; 1389 } 1390 1391 return 0; 1392 } 1393 1394 static void ioat_remove(struct pci_dev *pdev) 1395 { 1396 struct ioatdma_device *device = pci_get_drvdata(pdev); 1397 1398 if (!device) 1399 return; 1400 1401 ioat_shutdown(pdev); 1402 1403 dev_err(&pdev->dev, "Removing dma and dca services\n"); 1404 if (device->dca) { 1405 unregister_dca_provider(device->dca, &pdev->dev); 1406 free_dca_provider(device->dca); 1407 device->dca = NULL; 1408 } 1409 1410 ioat_dma_remove(device); 1411 } 1412 1413 static int __init ioat_init_module(void) 1414 { 1415 int err = -ENOMEM; 1416 1417 pr_info("%s: Intel(R) QuickData Technology Driver %s\n", 1418 DRV_NAME, IOAT_DMA_VERSION); 1419 1420 ioat_cache = kmem_cache_create("ioat", sizeof(struct ioat_ring_ent), 1421 0, SLAB_HWCACHE_ALIGN, NULL); 1422 if (!ioat_cache) 1423 return -ENOMEM; 1424 1425 ioat_sed_cache = KMEM_CACHE(ioat_sed_ent, 0); 1426 if (!ioat_sed_cache) 1427 goto err_ioat_cache; 1428 1429 err = pci_register_driver(&ioat_pci_driver); 1430 if (err) 1431 goto err_ioat3_cache; 1432 1433 return 0; 1434 1435 err_ioat3_cache: 1436 kmem_cache_destroy(ioat_sed_cache); 1437 1438 err_ioat_cache: 1439 kmem_cache_destroy(ioat_cache); 1440 1441 return err; 1442 } 1443 module_init(ioat_init_module); 1444 1445 static void __exit ioat_exit_module(void) 1446 { 1447 pci_unregister_driver(&ioat_pci_driver); 1448 kmem_cache_destroy(ioat_cache); 1449 } 1450 module_exit(ioat_exit_module); 1451