| 1 | /* |
| 2 | * Intel MIC Platform Software Stack (MPSS) |
| 3 | * |
| 4 | * Copyright(c) 2016 Intel Corporation. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License, version 2, as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * The full GNU General Public License is included in this distribution in |
| 16 | * the file called "COPYING". |
| 17 | * |
| 18 | * Intel Virtio Over PCIe (VOP) driver. |
| 19 | * |
| 20 | */ |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/poll.h> |
| 23 | #include <linux/dma-mapping.h> |
| 24 | |
| 25 | #include <linux/mic_common.h> |
| 26 | #include "../common/mic_dev.h" |
| 27 | |
| 28 | #include <linux/mic_ioctl.h> |
| 29 | #include "vop_main.h" |
| 30 | |
| 31 | /* Helper API to obtain the VOP PCIe device */ |
| 32 | static inline struct device *vop_dev(struct vop_vdev *vdev) |
| 33 | { |
| 34 | return vdev->vpdev->dev.parent; |
| 35 | } |
| 36 | |
| 37 | /* Helper API to check if a virtio device is initialized */ |
| 38 | static inline int vop_vdev_inited(struct vop_vdev *vdev) |
| 39 | { |
| 40 | if (!vdev) |
| 41 | return -EINVAL; |
| 42 | /* Device has not been created yet */ |
| 43 | if (!vdev->dd || !vdev->dd->type) { |
| 44 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 45 | __func__, __LINE__, -EINVAL); |
| 46 | return -EINVAL; |
| 47 | } |
| 48 | /* Device has been removed/deleted */ |
| 49 | if (vdev->dd->type == -1) { |
| 50 | dev_dbg(vop_dev(vdev), "%s %d err %d\n", |
| 51 | __func__, __LINE__, -ENODEV); |
| 52 | return -ENODEV; |
| 53 | } |
| 54 | return 0; |
| 55 | } |
| 56 | |
| 57 | static void _vop_notify(struct vringh *vrh) |
| 58 | { |
| 59 | struct vop_vringh *vvrh = container_of(vrh, struct vop_vringh, vrh); |
| 60 | struct vop_vdev *vdev = vvrh->vdev; |
| 61 | struct vop_device *vpdev = vdev->vpdev; |
| 62 | s8 db = vdev->dc->h2c_vdev_db; |
| 63 | |
| 64 | if (db != -1) |
| 65 | vpdev->hw_ops->send_intr(vpdev, db); |
| 66 | } |
| 67 | |
| 68 | static void vop_virtio_init_post(struct vop_vdev *vdev) |
| 69 | { |
| 70 | struct mic_vqconfig *vqconfig = mic_vq_config(vdev->dd); |
| 71 | struct vop_device *vpdev = vdev->vpdev; |
| 72 | int i, used_size; |
| 73 | |
| 74 | for (i = 0; i < vdev->dd->num_vq; i++) { |
| 75 | used_size = PAGE_ALIGN(sizeof(u16) * 3 + |
| 76 | sizeof(struct vring_used_elem) * |
| 77 | le16_to_cpu(vqconfig->num)); |
| 78 | if (!le64_to_cpu(vqconfig[i].used_address)) { |
| 79 | dev_warn(vop_dev(vdev), "used_address zero??\n"); |
| 80 | continue; |
| 81 | } |
| 82 | vdev->vvr[i].vrh.vring.used = |
| 83 | (void __force *)vpdev->hw_ops->ioremap( |
| 84 | vpdev, |
| 85 | le64_to_cpu(vqconfig[i].used_address), |
| 86 | used_size); |
| 87 | } |
| 88 | |
| 89 | vdev->dc->used_address_updated = 0; |
| 90 | |
| 91 | dev_info(vop_dev(vdev), "%s: device type %d LINKUP\n", |
| 92 | __func__, vdev->virtio_id); |
| 93 | } |
| 94 | |
| 95 | static inline void vop_virtio_device_reset(struct vop_vdev *vdev) |
| 96 | { |
| 97 | int i; |
| 98 | |
| 99 | dev_dbg(vop_dev(vdev), "%s: status %d device type %d RESET\n", |
| 100 | __func__, vdev->dd->status, vdev->virtio_id); |
| 101 | |
| 102 | for (i = 0; i < vdev->dd->num_vq; i++) |
| 103 | /* |
| 104 | * Avoid lockdep false positive. The + 1 is for the vop |
| 105 | * mutex which is held in the reset devices code path. |
| 106 | */ |
| 107 | mutex_lock_nested(&vdev->vvr[i].vr_mutex, i + 1); |
| 108 | |
| 109 | /* 0 status means "reset" */ |
| 110 | vdev->dd->status = 0; |
| 111 | vdev->dc->vdev_reset = 0; |
| 112 | vdev->dc->host_ack = 1; |
| 113 | |
| 114 | for (i = 0; i < vdev->dd->num_vq; i++) { |
| 115 | struct vringh *vrh = &vdev->vvr[i].vrh; |
| 116 | |
| 117 | vdev->vvr[i].vring.info->avail_idx = 0; |
| 118 | vrh->completed = 0; |
| 119 | vrh->last_avail_idx = 0; |
| 120 | vrh->last_used_idx = 0; |
| 121 | } |
| 122 | |
| 123 | for (i = 0; i < vdev->dd->num_vq; i++) |
| 124 | mutex_unlock(&vdev->vvr[i].vr_mutex); |
| 125 | } |
| 126 | |
| 127 | static void vop_virtio_reset_devices(struct vop_info *vi) |
| 128 | { |
| 129 | struct list_head *pos, *tmp; |
| 130 | struct vop_vdev *vdev; |
| 131 | |
| 132 | list_for_each_safe(pos, tmp, &vi->vdev_list) { |
| 133 | vdev = list_entry(pos, struct vop_vdev, list); |
| 134 | vop_virtio_device_reset(vdev); |
| 135 | vdev->poll_wake = 1; |
| 136 | wake_up(&vdev->waitq); |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | static void vop_bh_handler(struct work_struct *work) |
| 141 | { |
| 142 | struct vop_vdev *vdev = container_of(work, struct vop_vdev, |
| 143 | virtio_bh_work); |
| 144 | |
| 145 | if (vdev->dc->used_address_updated) |
| 146 | vop_virtio_init_post(vdev); |
| 147 | |
| 148 | if (vdev->dc->vdev_reset) |
| 149 | vop_virtio_device_reset(vdev); |
| 150 | |
| 151 | vdev->poll_wake = 1; |
| 152 | wake_up(&vdev->waitq); |
| 153 | } |
| 154 | |
| 155 | static irqreturn_t _vop_virtio_intr_handler(int irq, void *data) |
| 156 | { |
| 157 | struct vop_vdev *vdev = data; |
| 158 | struct vop_device *vpdev = vdev->vpdev; |
| 159 | |
| 160 | vpdev->hw_ops->ack_interrupt(vpdev, vdev->virtio_db); |
| 161 | schedule_work(&vdev->virtio_bh_work); |
| 162 | return IRQ_HANDLED; |
| 163 | } |
| 164 | |
| 165 | static int vop_virtio_config_change(struct vop_vdev *vdev, void *argp) |
| 166 | { |
| 167 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake); |
| 168 | int ret = 0, retry, i; |
| 169 | struct vop_device *vpdev = vdev->vpdev; |
| 170 | struct vop_info *vi = dev_get_drvdata(&vpdev->dev); |
| 171 | struct mic_bootparam *bootparam = vpdev->hw_ops->get_dp(vpdev); |
| 172 | s8 db = bootparam->h2c_config_db; |
| 173 | |
| 174 | mutex_lock(&vi->vop_mutex); |
| 175 | for (i = 0; i < vdev->dd->num_vq; i++) |
| 176 | mutex_lock_nested(&vdev->vvr[i].vr_mutex, i + 1); |
| 177 | |
| 178 | if (db == -1 || vdev->dd->type == -1) { |
| 179 | ret = -EIO; |
| 180 | goto exit; |
| 181 | } |
| 182 | |
| 183 | memcpy(mic_vq_configspace(vdev->dd), argp, vdev->dd->config_len); |
| 184 | vdev->dc->config_change = MIC_VIRTIO_PARAM_CONFIG_CHANGED; |
| 185 | vpdev->hw_ops->send_intr(vpdev, db); |
| 186 | |
| 187 | for (retry = 100; retry--;) { |
| 188 | ret = wait_event_timeout(wake, vdev->dc->guest_ack, |
| 189 | msecs_to_jiffies(100)); |
| 190 | if (ret) |
| 191 | break; |
| 192 | } |
| 193 | |
| 194 | dev_dbg(vop_dev(vdev), |
| 195 | "%s %d retry: %d\n", __func__, __LINE__, retry); |
| 196 | vdev->dc->config_change = 0; |
| 197 | vdev->dc->guest_ack = 0; |
| 198 | exit: |
| 199 | for (i = 0; i < vdev->dd->num_vq; i++) |
| 200 | mutex_unlock(&vdev->vvr[i].vr_mutex); |
| 201 | mutex_unlock(&vi->vop_mutex); |
| 202 | return ret; |
| 203 | } |
| 204 | |
| 205 | static int vop_copy_dp_entry(struct vop_vdev *vdev, |
| 206 | struct mic_device_desc *argp, __u8 *type, |
| 207 | struct mic_device_desc **devpage) |
| 208 | { |
| 209 | struct vop_device *vpdev = vdev->vpdev; |
| 210 | struct mic_device_desc *devp; |
| 211 | struct mic_vqconfig *vqconfig; |
| 212 | int ret = 0, i; |
| 213 | bool slot_found = false; |
| 214 | |
| 215 | vqconfig = mic_vq_config(argp); |
| 216 | for (i = 0; i < argp->num_vq; i++) { |
| 217 | if (le16_to_cpu(vqconfig[i].num) > MIC_MAX_VRING_ENTRIES) { |
| 218 | ret = -EINVAL; |
| 219 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 220 | __func__, __LINE__, ret); |
| 221 | goto exit; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | /* Find the first free device page entry */ |
| 226 | for (i = sizeof(struct mic_bootparam); |
| 227 | i < MIC_DP_SIZE - mic_total_desc_size(argp); |
| 228 | i += mic_total_desc_size(devp)) { |
| 229 | devp = vpdev->hw_ops->get_dp(vpdev) + i; |
| 230 | if (devp->type == 0 || devp->type == -1) { |
| 231 | slot_found = true; |
| 232 | break; |
| 233 | } |
| 234 | } |
| 235 | if (!slot_found) { |
| 236 | ret = -EINVAL; |
| 237 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 238 | __func__, __LINE__, ret); |
| 239 | goto exit; |
| 240 | } |
| 241 | /* |
| 242 | * Save off the type before doing the memcpy. Type will be set in the |
| 243 | * end after completing all initialization for the new device. |
| 244 | */ |
| 245 | *type = argp->type; |
| 246 | argp->type = 0; |
| 247 | memcpy(devp, argp, mic_desc_size(argp)); |
| 248 | |
| 249 | *devpage = devp; |
| 250 | exit: |
| 251 | return ret; |
| 252 | } |
| 253 | |
| 254 | static void vop_init_device_ctrl(struct vop_vdev *vdev, |
| 255 | struct mic_device_desc *devpage) |
| 256 | { |
| 257 | struct mic_device_ctrl *dc; |
| 258 | |
| 259 | dc = (void *)devpage + mic_aligned_desc_size(devpage); |
| 260 | |
| 261 | dc->config_change = 0; |
| 262 | dc->guest_ack = 0; |
| 263 | dc->vdev_reset = 0; |
| 264 | dc->host_ack = 0; |
| 265 | dc->used_address_updated = 0; |
| 266 | dc->c2h_vdev_db = -1; |
| 267 | dc->h2c_vdev_db = -1; |
| 268 | vdev->dc = dc; |
| 269 | } |
| 270 | |
| 271 | static int vop_virtio_add_device(struct vop_vdev *vdev, |
| 272 | struct mic_device_desc *argp) |
| 273 | { |
| 274 | struct vop_info *vi = vdev->vi; |
| 275 | struct vop_device *vpdev = vi->vpdev; |
| 276 | struct mic_device_desc *dd = NULL; |
| 277 | struct mic_vqconfig *vqconfig; |
| 278 | int vr_size, i, j, ret; |
| 279 | u8 type = 0; |
| 280 | s8 db = -1; |
| 281 | char irqname[16]; |
| 282 | struct mic_bootparam *bootparam; |
| 283 | u16 num; |
| 284 | dma_addr_t vr_addr; |
| 285 | |
| 286 | bootparam = vpdev->hw_ops->get_dp(vpdev); |
| 287 | init_waitqueue_head(&vdev->waitq); |
| 288 | INIT_LIST_HEAD(&vdev->list); |
| 289 | vdev->vpdev = vpdev; |
| 290 | |
| 291 | ret = vop_copy_dp_entry(vdev, argp, &type, &dd); |
| 292 | if (ret) { |
| 293 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 294 | __func__, __LINE__, ret); |
| 295 | kfree(vdev); |
| 296 | return ret; |
| 297 | } |
| 298 | |
| 299 | vop_init_device_ctrl(vdev, dd); |
| 300 | |
| 301 | vdev->dd = dd; |
| 302 | vdev->virtio_id = type; |
| 303 | vqconfig = mic_vq_config(dd); |
| 304 | INIT_WORK(&vdev->virtio_bh_work, vop_bh_handler); |
| 305 | |
| 306 | for (i = 0; i < dd->num_vq; i++) { |
| 307 | struct vop_vringh *vvr = &vdev->vvr[i]; |
| 308 | struct mic_vring *vr = &vdev->vvr[i].vring; |
| 309 | |
| 310 | num = le16_to_cpu(vqconfig[i].num); |
| 311 | mutex_init(&vvr->vr_mutex); |
| 312 | vr_size = PAGE_ALIGN(vring_size(num, MIC_VIRTIO_RING_ALIGN) + |
| 313 | sizeof(struct _mic_vring_info)); |
| 314 | vr->va = (void *) |
| 315 | __get_free_pages(GFP_KERNEL | __GFP_ZERO, |
| 316 | get_order(vr_size)); |
| 317 | if (!vr->va) { |
| 318 | ret = -ENOMEM; |
| 319 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 320 | __func__, __LINE__, ret); |
| 321 | goto err; |
| 322 | } |
| 323 | vr->len = vr_size; |
| 324 | vr->info = vr->va + vring_size(num, MIC_VIRTIO_RING_ALIGN); |
| 325 | vr->info->magic = cpu_to_le32(MIC_MAGIC + vdev->virtio_id + i); |
| 326 | vr_addr = dma_map_single(&vpdev->dev, vr->va, vr_size, |
| 327 | DMA_BIDIRECTIONAL); |
| 328 | if (dma_mapping_error(&vpdev->dev, vr_addr)) { |
| 329 | free_pages((unsigned long)vr->va, get_order(vr_size)); |
| 330 | ret = -ENOMEM; |
| 331 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 332 | __func__, __LINE__, ret); |
| 333 | goto err; |
| 334 | } |
| 335 | vqconfig[i].address = cpu_to_le64(vr_addr); |
| 336 | |
| 337 | vring_init(&vr->vr, num, vr->va, MIC_VIRTIO_RING_ALIGN); |
| 338 | ret = vringh_init_kern(&vvr->vrh, |
| 339 | *(u32 *)mic_vq_features(vdev->dd), |
| 340 | num, false, vr->vr.desc, vr->vr.avail, |
| 341 | vr->vr.used); |
| 342 | if (ret) { |
| 343 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 344 | __func__, __LINE__, ret); |
| 345 | goto err; |
| 346 | } |
| 347 | vringh_kiov_init(&vvr->riov, NULL, 0); |
| 348 | vringh_kiov_init(&vvr->wiov, NULL, 0); |
| 349 | vvr->head = USHRT_MAX; |
| 350 | vvr->vdev = vdev; |
| 351 | vvr->vrh.notify = _vop_notify; |
| 352 | dev_dbg(&vpdev->dev, |
| 353 | "%s %d index %d va %p info %p vr_size 0x%x\n", |
| 354 | __func__, __LINE__, i, vr->va, vr->info, vr_size); |
| 355 | vvr->buf = (void *)__get_free_pages(GFP_KERNEL, |
| 356 | get_order(VOP_INT_DMA_BUF_SIZE)); |
| 357 | vvr->buf_da = dma_map_single(&vpdev->dev, |
| 358 | vvr->buf, VOP_INT_DMA_BUF_SIZE, |
| 359 | DMA_BIDIRECTIONAL); |
| 360 | } |
| 361 | |
| 362 | snprintf(irqname, sizeof(irqname), "vop%dvirtio%d", vpdev->index, |
| 363 | vdev->virtio_id); |
| 364 | vdev->virtio_db = vpdev->hw_ops->next_db(vpdev); |
| 365 | vdev->virtio_cookie = vpdev->hw_ops->request_irq(vpdev, |
| 366 | _vop_virtio_intr_handler, irqname, vdev, |
| 367 | vdev->virtio_db); |
| 368 | if (IS_ERR(vdev->virtio_cookie)) { |
| 369 | ret = PTR_ERR(vdev->virtio_cookie); |
| 370 | dev_dbg(&vpdev->dev, "request irq failed\n"); |
| 371 | goto err; |
| 372 | } |
| 373 | |
| 374 | vdev->dc->c2h_vdev_db = vdev->virtio_db; |
| 375 | |
| 376 | /* |
| 377 | * Order the type update with previous stores. This write barrier |
| 378 | * is paired with the corresponding read barrier before the uncached |
| 379 | * system memory read of the type, on the card while scanning the |
| 380 | * device page. |
| 381 | */ |
| 382 | smp_wmb(); |
| 383 | dd->type = type; |
| 384 | argp->type = type; |
| 385 | |
| 386 | if (bootparam) { |
| 387 | db = bootparam->h2c_config_db; |
| 388 | if (db != -1) |
| 389 | vpdev->hw_ops->send_intr(vpdev, db); |
| 390 | } |
| 391 | dev_dbg(&vpdev->dev, "Added virtio id %d db %d\n", dd->type, db); |
| 392 | return 0; |
| 393 | err: |
| 394 | vqconfig = mic_vq_config(dd); |
| 395 | for (j = 0; j < i; j++) { |
| 396 | struct vop_vringh *vvr = &vdev->vvr[j]; |
| 397 | |
| 398 | dma_unmap_single(&vpdev->dev, le64_to_cpu(vqconfig[j].address), |
| 399 | vvr->vring.len, DMA_BIDIRECTIONAL); |
| 400 | free_pages((unsigned long)vvr->vring.va, |
| 401 | get_order(vvr->vring.len)); |
| 402 | } |
| 403 | return ret; |
| 404 | } |
| 405 | |
| 406 | static void vop_dev_remove(struct vop_info *pvi, struct mic_device_ctrl *devp, |
| 407 | struct vop_device *vpdev) |
| 408 | { |
| 409 | struct mic_bootparam *bootparam = vpdev->hw_ops->get_dp(vpdev); |
| 410 | s8 db; |
| 411 | int ret, retry; |
| 412 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake); |
| 413 | |
| 414 | devp->config_change = MIC_VIRTIO_PARAM_DEV_REMOVE; |
| 415 | db = bootparam->h2c_config_db; |
| 416 | if (db != -1) |
| 417 | vpdev->hw_ops->send_intr(vpdev, db); |
| 418 | else |
| 419 | goto done; |
| 420 | for (retry = 15; retry--;) { |
| 421 | ret = wait_event_timeout(wake, devp->guest_ack, |
| 422 | msecs_to_jiffies(1000)); |
| 423 | if (ret) |
| 424 | break; |
| 425 | } |
| 426 | done: |
| 427 | devp->config_change = 0; |
| 428 | devp->guest_ack = 0; |
| 429 | } |
| 430 | |
| 431 | static void vop_virtio_del_device(struct vop_vdev *vdev) |
| 432 | { |
| 433 | struct vop_info *vi = vdev->vi; |
| 434 | struct vop_device *vpdev = vdev->vpdev; |
| 435 | int i; |
| 436 | struct mic_vqconfig *vqconfig; |
| 437 | struct mic_bootparam *bootparam = vpdev->hw_ops->get_dp(vpdev); |
| 438 | |
| 439 | if (!bootparam) |
| 440 | goto skip_hot_remove; |
| 441 | vop_dev_remove(vi, vdev->dc, vpdev); |
| 442 | skip_hot_remove: |
| 443 | vpdev->hw_ops->free_irq(vpdev, vdev->virtio_cookie, vdev); |
| 444 | flush_work(&vdev->virtio_bh_work); |
| 445 | vqconfig = mic_vq_config(vdev->dd); |
| 446 | for (i = 0; i < vdev->dd->num_vq; i++) { |
| 447 | struct vop_vringh *vvr = &vdev->vvr[i]; |
| 448 | |
| 449 | dma_unmap_single(&vpdev->dev, |
| 450 | vvr->buf_da, VOP_INT_DMA_BUF_SIZE, |
| 451 | DMA_BIDIRECTIONAL); |
| 452 | free_pages((unsigned long)vvr->buf, |
| 453 | get_order(VOP_INT_DMA_BUF_SIZE)); |
| 454 | vringh_kiov_cleanup(&vvr->riov); |
| 455 | vringh_kiov_cleanup(&vvr->wiov); |
| 456 | dma_unmap_single(&vpdev->dev, le64_to_cpu(vqconfig[i].address), |
| 457 | vvr->vring.len, DMA_BIDIRECTIONAL); |
| 458 | free_pages((unsigned long)vvr->vring.va, |
| 459 | get_order(vvr->vring.len)); |
| 460 | } |
| 461 | /* |
| 462 | * Order the type update with previous stores. This write barrier |
| 463 | * is paired with the corresponding read barrier before the uncached |
| 464 | * system memory read of the type, on the card while scanning the |
| 465 | * device page. |
| 466 | */ |
| 467 | smp_wmb(); |
| 468 | vdev->dd->type = -1; |
| 469 | } |
| 470 | |
| 471 | /* |
| 472 | * vop_sync_dma - Wrapper for synchronous DMAs. |
| 473 | * |
| 474 | * @dev - The address of the pointer to the device instance used |
| 475 | * for DMA registration. |
| 476 | * @dst - destination DMA address. |
| 477 | * @src - source DMA address. |
| 478 | * @len - size of the transfer. |
| 479 | * |
| 480 | * Return DMA_SUCCESS on success |
| 481 | */ |
| 482 | static int vop_sync_dma(struct vop_vdev *vdev, dma_addr_t dst, dma_addr_t src, |
| 483 | size_t len) |
| 484 | { |
| 485 | int err = 0; |
| 486 | struct dma_device *ddev; |
| 487 | struct dma_async_tx_descriptor *tx; |
| 488 | struct vop_info *vi = dev_get_drvdata(&vdev->vpdev->dev); |
| 489 | struct dma_chan *vop_ch = vi->dma_ch; |
| 490 | |
| 491 | if (!vop_ch) { |
| 492 | err = -EBUSY; |
| 493 | goto error; |
| 494 | } |
| 495 | ddev = vop_ch->device; |
| 496 | tx = ddev->device_prep_dma_memcpy(vop_ch, dst, src, len, |
| 497 | DMA_PREP_FENCE); |
| 498 | if (!tx) { |
| 499 | err = -ENOMEM; |
| 500 | goto error; |
| 501 | } else { |
| 502 | dma_cookie_t cookie; |
| 503 | |
| 504 | cookie = tx->tx_submit(tx); |
| 505 | if (dma_submit_error(cookie)) { |
| 506 | err = -ENOMEM; |
| 507 | goto error; |
| 508 | } |
| 509 | dma_async_issue_pending(vop_ch); |
| 510 | err = dma_sync_wait(vop_ch, cookie); |
| 511 | } |
| 512 | error: |
| 513 | if (err) |
| 514 | dev_err(&vi->vpdev->dev, "%s %d err %d\n", |
| 515 | __func__, __LINE__, err); |
| 516 | return err; |
| 517 | } |
| 518 | |
| 519 | #define VOP_USE_DMA true |
| 520 | |
| 521 | /* |
| 522 | * Initiates the copies across the PCIe bus from card memory to a user |
| 523 | * space buffer. When transfers are done using DMA, source/destination |
| 524 | * addresses and transfer length must follow the alignment requirements of |
| 525 | * the MIC DMA engine. |
| 526 | */ |
| 527 | static int vop_virtio_copy_to_user(struct vop_vdev *vdev, void __user *ubuf, |
| 528 | size_t len, u64 daddr, size_t dlen, |
| 529 | int vr_idx) |
| 530 | { |
| 531 | struct vop_device *vpdev = vdev->vpdev; |
| 532 | void __iomem *dbuf = vpdev->hw_ops->ioremap(vpdev, daddr, len); |
| 533 | struct vop_vringh *vvr = &vdev->vvr[vr_idx]; |
| 534 | struct vop_info *vi = dev_get_drvdata(&vpdev->dev); |
| 535 | size_t dma_alignment = 1 << vi->dma_ch->device->copy_align; |
| 536 | bool x200 = is_dma_copy_aligned(vi->dma_ch->device, 1, 1, 1); |
| 537 | size_t dma_offset, partlen; |
| 538 | int err; |
| 539 | |
| 540 | if (!VOP_USE_DMA) { |
| 541 | if (copy_to_user(ubuf, (void __force *)dbuf, len)) { |
| 542 | err = -EFAULT; |
| 543 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 544 | __func__, __LINE__, err); |
| 545 | goto err; |
| 546 | } |
| 547 | vdev->in_bytes += len; |
| 548 | err = 0; |
| 549 | goto err; |
| 550 | } |
| 551 | |
| 552 | dma_offset = daddr - round_down(daddr, dma_alignment); |
| 553 | daddr -= dma_offset; |
| 554 | len += dma_offset; |
| 555 | /* |
| 556 | * X100 uses DMA addresses as seen by the card so adding |
| 557 | * the aperture base is not required for DMA. However x200 |
| 558 | * requires DMA addresses to be an offset into the bar so |
| 559 | * add the aperture base for x200. |
| 560 | */ |
| 561 | if (x200) |
| 562 | daddr += vpdev->aper->pa; |
| 563 | while (len) { |
| 564 | partlen = min_t(size_t, len, VOP_INT_DMA_BUF_SIZE); |
| 565 | err = vop_sync_dma(vdev, vvr->buf_da, daddr, |
| 566 | ALIGN(partlen, dma_alignment)); |
| 567 | if (err) { |
| 568 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 569 | __func__, __LINE__, err); |
| 570 | goto err; |
| 571 | } |
| 572 | if (copy_to_user(ubuf, vvr->buf + dma_offset, |
| 573 | partlen - dma_offset)) { |
| 574 | err = -EFAULT; |
| 575 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 576 | __func__, __LINE__, err); |
| 577 | goto err; |
| 578 | } |
| 579 | daddr += partlen; |
| 580 | ubuf += partlen; |
| 581 | dbuf += partlen; |
| 582 | vdev->in_bytes_dma += partlen; |
| 583 | vdev->in_bytes += partlen; |
| 584 | len -= partlen; |
| 585 | dma_offset = 0; |
| 586 | } |
| 587 | err = 0; |
| 588 | err: |
| 589 | vpdev->hw_ops->iounmap(vpdev, dbuf); |
| 590 | dev_dbg(vop_dev(vdev), |
| 591 | "%s: ubuf %p dbuf %p len 0x%lx vr_idx 0x%x\n", |
| 592 | __func__, ubuf, dbuf, len, vr_idx); |
| 593 | return err; |
| 594 | } |
| 595 | |
| 596 | /* |
| 597 | * Initiates copies across the PCIe bus from a user space buffer to card |
| 598 | * memory. When transfers are done using DMA, source/destination addresses |
| 599 | * and transfer length must follow the alignment requirements of the MIC |
| 600 | * DMA engine. |
| 601 | */ |
| 602 | static int vop_virtio_copy_from_user(struct vop_vdev *vdev, void __user *ubuf, |
| 603 | size_t len, u64 daddr, size_t dlen, |
| 604 | int vr_idx) |
| 605 | { |
| 606 | struct vop_device *vpdev = vdev->vpdev; |
| 607 | void __iomem *dbuf = vpdev->hw_ops->ioremap(vpdev, daddr, len); |
| 608 | struct vop_vringh *vvr = &vdev->vvr[vr_idx]; |
| 609 | struct vop_info *vi = dev_get_drvdata(&vdev->vpdev->dev); |
| 610 | size_t dma_alignment = 1 << vi->dma_ch->device->copy_align; |
| 611 | bool x200 = is_dma_copy_aligned(vi->dma_ch->device, 1, 1, 1); |
| 612 | size_t partlen; |
| 613 | bool dma = VOP_USE_DMA; |
| 614 | int err = 0; |
| 615 | |
| 616 | if (daddr & (dma_alignment - 1)) { |
| 617 | vdev->tx_dst_unaligned += len; |
| 618 | dma = false; |
| 619 | } else if (ALIGN(len, dma_alignment) > dlen) { |
| 620 | vdev->tx_len_unaligned += len; |
| 621 | dma = false; |
| 622 | } |
| 623 | |
| 624 | if (!dma) |
| 625 | goto memcpy; |
| 626 | |
| 627 | /* |
| 628 | * X100 uses DMA addresses as seen by the card so adding |
| 629 | * the aperture base is not required for DMA. However x200 |
| 630 | * requires DMA addresses to be an offset into the bar so |
| 631 | * add the aperture base for x200. |
| 632 | */ |
| 633 | if (x200) |
| 634 | daddr += vpdev->aper->pa; |
| 635 | while (len) { |
| 636 | partlen = min_t(size_t, len, VOP_INT_DMA_BUF_SIZE); |
| 637 | |
| 638 | if (copy_from_user(vvr->buf, ubuf, partlen)) { |
| 639 | err = -EFAULT; |
| 640 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 641 | __func__, __LINE__, err); |
| 642 | goto err; |
| 643 | } |
| 644 | err = vop_sync_dma(vdev, daddr, vvr->buf_da, |
| 645 | ALIGN(partlen, dma_alignment)); |
| 646 | if (err) { |
| 647 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 648 | __func__, __LINE__, err); |
| 649 | goto err; |
| 650 | } |
| 651 | daddr += partlen; |
| 652 | ubuf += partlen; |
| 653 | dbuf += partlen; |
| 654 | vdev->out_bytes_dma += partlen; |
| 655 | vdev->out_bytes += partlen; |
| 656 | len -= partlen; |
| 657 | } |
| 658 | memcpy: |
| 659 | /* |
| 660 | * We are copying to IO below and should ideally use something |
| 661 | * like copy_from_user_toio(..) if it existed. |
| 662 | */ |
| 663 | if (copy_from_user((void __force *)dbuf, ubuf, len)) { |
| 664 | err = -EFAULT; |
| 665 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 666 | __func__, __LINE__, err); |
| 667 | goto err; |
| 668 | } |
| 669 | vdev->out_bytes += len; |
| 670 | err = 0; |
| 671 | err: |
| 672 | vpdev->hw_ops->iounmap(vpdev, dbuf); |
| 673 | dev_dbg(vop_dev(vdev), |
| 674 | "%s: ubuf %p dbuf %p len 0x%lx vr_idx 0x%x\n", |
| 675 | __func__, ubuf, dbuf, len, vr_idx); |
| 676 | return err; |
| 677 | } |
| 678 | |
| 679 | #define MIC_VRINGH_READ true |
| 680 | |
| 681 | /* Determine the total number of bytes consumed in a VRINGH KIOV */ |
| 682 | static inline u32 vop_vringh_iov_consumed(struct vringh_kiov *iov) |
| 683 | { |
| 684 | int i; |
| 685 | u32 total = iov->consumed; |
| 686 | |
| 687 | for (i = 0; i < iov->i; i++) |
| 688 | total += iov->iov[i].iov_len; |
| 689 | return total; |
| 690 | } |
| 691 | |
| 692 | /* |
| 693 | * Traverse the VRINGH KIOV and issue the APIs to trigger the copies. |
| 694 | * This API is heavily based on the vringh_iov_xfer(..) implementation |
| 695 | * in vringh.c. The reason we cannot reuse vringh_iov_pull_kern(..) |
| 696 | * and vringh_iov_push_kern(..) directly is because there is no |
| 697 | * way to override the VRINGH xfer(..) routines as of v3.10. |
| 698 | */ |
| 699 | static int vop_vringh_copy(struct vop_vdev *vdev, struct vringh_kiov *iov, |
| 700 | void __user *ubuf, size_t len, bool read, int vr_idx, |
| 701 | size_t *out_len) |
| 702 | { |
| 703 | int ret = 0; |
| 704 | size_t partlen, tot_len = 0; |
| 705 | |
| 706 | while (len && iov->i < iov->used) { |
| 707 | struct kvec *kiov = &iov->iov[iov->i]; |
| 708 | |
| 709 | partlen = min(kiov->iov_len, len); |
| 710 | if (read) |
| 711 | ret = vop_virtio_copy_to_user(vdev, ubuf, partlen, |
| 712 | (u64)kiov->iov_base, |
| 713 | kiov->iov_len, |
| 714 | vr_idx); |
| 715 | else |
| 716 | ret = vop_virtio_copy_from_user(vdev, ubuf, partlen, |
| 717 | (u64)kiov->iov_base, |
| 718 | kiov->iov_len, |
| 719 | vr_idx); |
| 720 | if (ret) { |
| 721 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 722 | __func__, __LINE__, ret); |
| 723 | break; |
| 724 | } |
| 725 | len -= partlen; |
| 726 | ubuf += partlen; |
| 727 | tot_len += partlen; |
| 728 | iov->consumed += partlen; |
| 729 | kiov->iov_len -= partlen; |
| 730 | kiov->iov_base += partlen; |
| 731 | if (!kiov->iov_len) { |
| 732 | /* Fix up old iov element then increment. */ |
| 733 | kiov->iov_len = iov->consumed; |
| 734 | kiov->iov_base -= iov->consumed; |
| 735 | |
| 736 | iov->consumed = 0; |
| 737 | iov->i++; |
| 738 | } |
| 739 | } |
| 740 | *out_len = tot_len; |
| 741 | return ret; |
| 742 | } |
| 743 | |
| 744 | /* |
| 745 | * Use the standard VRINGH infrastructure in the kernel to fetch new |
| 746 | * descriptors, initiate the copies and update the used ring. |
| 747 | */ |
| 748 | static int _vop_virtio_copy(struct vop_vdev *vdev, struct mic_copy_desc *copy) |
| 749 | { |
| 750 | int ret = 0; |
| 751 | u32 iovcnt = copy->iovcnt; |
| 752 | struct iovec iov; |
| 753 | struct iovec __user *u_iov = copy->iov; |
| 754 | void __user *ubuf = NULL; |
| 755 | struct vop_vringh *vvr = &vdev->vvr[copy->vr_idx]; |
| 756 | struct vringh_kiov *riov = &vvr->riov; |
| 757 | struct vringh_kiov *wiov = &vvr->wiov; |
| 758 | struct vringh *vrh = &vvr->vrh; |
| 759 | u16 *head = &vvr->head; |
| 760 | struct mic_vring *vr = &vvr->vring; |
| 761 | size_t len = 0, out_len; |
| 762 | |
| 763 | copy->out_len = 0; |
| 764 | /* Fetch a new IOVEC if all previous elements have been processed */ |
| 765 | if (riov->i == riov->used && wiov->i == wiov->used) { |
| 766 | ret = vringh_getdesc_kern(vrh, riov, wiov, |
| 767 | head, GFP_KERNEL); |
| 768 | /* Check if there are available descriptors */ |
| 769 | if (ret <= 0) |
| 770 | return ret; |
| 771 | } |
| 772 | while (iovcnt) { |
| 773 | if (!len) { |
| 774 | /* Copy over a new iovec from user space. */ |
| 775 | ret = copy_from_user(&iov, u_iov, sizeof(*u_iov)); |
| 776 | if (ret) { |
| 777 | ret = -EINVAL; |
| 778 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 779 | __func__, __LINE__, ret); |
| 780 | break; |
| 781 | } |
| 782 | len = iov.iov_len; |
| 783 | ubuf = iov.iov_base; |
| 784 | } |
| 785 | /* Issue all the read descriptors first */ |
| 786 | ret = vop_vringh_copy(vdev, riov, ubuf, len, |
| 787 | MIC_VRINGH_READ, copy->vr_idx, &out_len); |
| 788 | if (ret) { |
| 789 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 790 | __func__, __LINE__, ret); |
| 791 | break; |
| 792 | } |
| 793 | len -= out_len; |
| 794 | ubuf += out_len; |
| 795 | copy->out_len += out_len; |
| 796 | /* Issue the write descriptors next */ |
| 797 | ret = vop_vringh_copy(vdev, wiov, ubuf, len, |
| 798 | !MIC_VRINGH_READ, copy->vr_idx, &out_len); |
| 799 | if (ret) { |
| 800 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 801 | __func__, __LINE__, ret); |
| 802 | break; |
| 803 | } |
| 804 | len -= out_len; |
| 805 | ubuf += out_len; |
| 806 | copy->out_len += out_len; |
| 807 | if (!len) { |
| 808 | /* One user space iovec is now completed */ |
| 809 | iovcnt--; |
| 810 | u_iov++; |
| 811 | } |
| 812 | /* Exit loop if all elements in KIOVs have been processed. */ |
| 813 | if (riov->i == riov->used && wiov->i == wiov->used) |
| 814 | break; |
| 815 | } |
| 816 | /* |
| 817 | * Update the used ring if a descriptor was available and some data was |
| 818 | * copied in/out and the user asked for a used ring update. |
| 819 | */ |
| 820 | if (*head != USHRT_MAX && copy->out_len && copy->update_used) { |
| 821 | u32 total = 0; |
| 822 | |
| 823 | /* Determine the total data consumed */ |
| 824 | total += vop_vringh_iov_consumed(riov); |
| 825 | total += vop_vringh_iov_consumed(wiov); |
| 826 | vringh_complete_kern(vrh, *head, total); |
| 827 | *head = USHRT_MAX; |
| 828 | if (vringh_need_notify_kern(vrh) > 0) |
| 829 | vringh_notify(vrh); |
| 830 | vringh_kiov_cleanup(riov); |
| 831 | vringh_kiov_cleanup(wiov); |
| 832 | /* Update avail idx for user space */ |
| 833 | vr->info->avail_idx = vrh->last_avail_idx; |
| 834 | } |
| 835 | return ret; |
| 836 | } |
| 837 | |
| 838 | static inline int vop_verify_copy_args(struct vop_vdev *vdev, |
| 839 | struct mic_copy_desc *copy) |
| 840 | { |
| 841 | if (!vdev || copy->vr_idx >= vdev->dd->num_vq) |
| 842 | return -EINVAL; |
| 843 | return 0; |
| 844 | } |
| 845 | |
| 846 | /* Copy a specified number of virtio descriptors in a chain */ |
| 847 | static int vop_virtio_copy_desc(struct vop_vdev *vdev, |
| 848 | struct mic_copy_desc *copy) |
| 849 | { |
| 850 | int err; |
| 851 | struct vop_vringh *vvr; |
| 852 | |
| 853 | err = vop_verify_copy_args(vdev, copy); |
| 854 | if (err) |
| 855 | return err; |
| 856 | |
| 857 | vvr = &vdev->vvr[copy->vr_idx]; |
| 858 | mutex_lock(&vvr->vr_mutex); |
| 859 | if (!vop_vdevup(vdev)) { |
| 860 | err = -ENODEV; |
| 861 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 862 | __func__, __LINE__, err); |
| 863 | goto err; |
| 864 | } |
| 865 | err = _vop_virtio_copy(vdev, copy); |
| 866 | if (err) { |
| 867 | dev_err(vop_dev(vdev), "%s %d err %d\n", |
| 868 | __func__, __LINE__, err); |
| 869 | } |
| 870 | err: |
| 871 | mutex_unlock(&vvr->vr_mutex); |
| 872 | return err; |
| 873 | } |
| 874 | |
| 875 | static int vop_open(struct inode *inode, struct file *f) |
| 876 | { |
| 877 | struct vop_vdev *vdev; |
| 878 | struct vop_info *vi = container_of(f->private_data, |
| 879 | struct vop_info, miscdev); |
| 880 | |
| 881 | vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); |
| 882 | if (!vdev) |
| 883 | return -ENOMEM; |
| 884 | vdev->vi = vi; |
| 885 | mutex_init(&vdev->vdev_mutex); |
| 886 | f->private_data = vdev; |
| 887 | init_completion(&vdev->destroy); |
| 888 | complete(&vdev->destroy); |
| 889 | return 0; |
| 890 | } |
| 891 | |
| 892 | static int vop_release(struct inode *inode, struct file *f) |
| 893 | { |
| 894 | struct vop_vdev *vdev = f->private_data, *vdev_tmp; |
| 895 | struct vop_info *vi = vdev->vi; |
| 896 | struct list_head *pos, *tmp; |
| 897 | bool found = false; |
| 898 | |
| 899 | mutex_lock(&vdev->vdev_mutex); |
| 900 | if (vdev->deleted) |
| 901 | goto unlock; |
| 902 | mutex_lock(&vi->vop_mutex); |
| 903 | list_for_each_safe(pos, tmp, &vi->vdev_list) { |
| 904 | vdev_tmp = list_entry(pos, struct vop_vdev, list); |
| 905 | if (vdev == vdev_tmp) { |
| 906 | vop_virtio_del_device(vdev); |
| 907 | list_del(pos); |
| 908 | found = true; |
| 909 | break; |
| 910 | } |
| 911 | } |
| 912 | mutex_unlock(&vi->vop_mutex); |
| 913 | unlock: |
| 914 | mutex_unlock(&vdev->vdev_mutex); |
| 915 | if (!found) |
| 916 | wait_for_completion(&vdev->destroy); |
| 917 | f->private_data = NULL; |
| 918 | kfree(vdev); |
| 919 | return 0; |
| 920 | } |
| 921 | |
| 922 | static long vop_ioctl(struct file *f, unsigned int cmd, unsigned long arg) |
| 923 | { |
| 924 | struct vop_vdev *vdev = f->private_data; |
| 925 | struct vop_info *vi = vdev->vi; |
| 926 | void __user *argp = (void __user *)arg; |
| 927 | int ret; |
| 928 | |
| 929 | switch (cmd) { |
| 930 | case MIC_VIRTIO_ADD_DEVICE: |
| 931 | { |
| 932 | struct mic_device_desc dd, *dd_config; |
| 933 | |
| 934 | if (copy_from_user(&dd, argp, sizeof(dd))) |
| 935 | return -EFAULT; |
| 936 | |
| 937 | if (mic_aligned_desc_size(&dd) > MIC_MAX_DESC_BLK_SIZE || |
| 938 | dd.num_vq > MIC_MAX_VRINGS) |
| 939 | return -EINVAL; |
| 940 | |
| 941 | dd_config = kzalloc(mic_desc_size(&dd), GFP_KERNEL); |
| 942 | if (!dd_config) |
| 943 | return -ENOMEM; |
| 944 | if (copy_from_user(dd_config, argp, mic_desc_size(&dd))) { |
| 945 | ret = -EFAULT; |
| 946 | goto free_ret; |
| 947 | } |
| 948 | /* Ensure desc has not changed between the two reads */ |
| 949 | if (memcmp(&dd, dd_config, sizeof(dd))) { |
| 950 | ret = -EINVAL; |
| 951 | goto free_ret; |
| 952 | } |
| 953 | mutex_lock(&vdev->vdev_mutex); |
| 954 | mutex_lock(&vi->vop_mutex); |
| 955 | ret = vop_virtio_add_device(vdev, dd_config); |
| 956 | if (ret) |
| 957 | goto unlock_ret; |
| 958 | list_add_tail(&vdev->list, &vi->vdev_list); |
| 959 | unlock_ret: |
| 960 | mutex_unlock(&vi->vop_mutex); |
| 961 | mutex_unlock(&vdev->vdev_mutex); |
| 962 | free_ret: |
| 963 | kfree(dd_config); |
| 964 | return ret; |
| 965 | } |
| 966 | case MIC_VIRTIO_COPY_DESC: |
| 967 | { |
| 968 | struct mic_copy_desc copy; |
| 969 | |
| 970 | mutex_lock(&vdev->vdev_mutex); |
| 971 | ret = vop_vdev_inited(vdev); |
| 972 | if (ret) |
| 973 | goto _unlock_ret; |
| 974 | |
| 975 | if (copy_from_user(©, argp, sizeof(copy))) { |
| 976 | ret = -EFAULT; |
| 977 | goto _unlock_ret; |
| 978 | } |
| 979 | |
| 980 | ret = vop_virtio_copy_desc(vdev, ©); |
| 981 | if (ret < 0) |
| 982 | goto _unlock_ret; |
| 983 | if (copy_to_user( |
| 984 | &((struct mic_copy_desc __user *)argp)->out_len, |
| 985 | ©.out_len, sizeof(copy.out_len))) |
| 986 | ret = -EFAULT; |
| 987 | _unlock_ret: |
| 988 | mutex_unlock(&vdev->vdev_mutex); |
| 989 | return ret; |
| 990 | } |
| 991 | case MIC_VIRTIO_CONFIG_CHANGE: |
| 992 | { |
| 993 | void *buf; |
| 994 | |
| 995 | mutex_lock(&vdev->vdev_mutex); |
| 996 | ret = vop_vdev_inited(vdev); |
| 997 | if (ret) |
| 998 | goto __unlock_ret; |
| 999 | buf = kzalloc(vdev->dd->config_len, GFP_KERNEL); |
| 1000 | if (!buf) { |
| 1001 | ret = -ENOMEM; |
| 1002 | goto __unlock_ret; |
| 1003 | } |
| 1004 | if (copy_from_user(buf, argp, vdev->dd->config_len)) { |
| 1005 | ret = -EFAULT; |
| 1006 | goto done; |
| 1007 | } |
| 1008 | ret = vop_virtio_config_change(vdev, buf); |
| 1009 | done: |
| 1010 | kfree(buf); |
| 1011 | __unlock_ret: |
| 1012 | mutex_unlock(&vdev->vdev_mutex); |
| 1013 | return ret; |
| 1014 | } |
| 1015 | default: |
| 1016 | return -ENOIOCTLCMD; |
| 1017 | }; |
| 1018 | return 0; |
| 1019 | } |
| 1020 | |
| 1021 | /* |
| 1022 | * We return POLLIN | POLLOUT from poll when new buffers are enqueued, and |
| 1023 | * not when previously enqueued buffers may be available. This means that |
| 1024 | * in the card->host (TX) path, when userspace is unblocked by poll it |
| 1025 | * must drain all available descriptors or it can stall. |
| 1026 | */ |
| 1027 | static unsigned int vop_poll(struct file *f, poll_table *wait) |
| 1028 | { |
| 1029 | struct vop_vdev *vdev = f->private_data; |
| 1030 | int mask = 0; |
| 1031 | |
| 1032 | mutex_lock(&vdev->vdev_mutex); |
| 1033 | if (vop_vdev_inited(vdev)) { |
| 1034 | mask = POLLERR; |
| 1035 | goto done; |
| 1036 | } |
| 1037 | poll_wait(f, &vdev->waitq, wait); |
| 1038 | if (vop_vdev_inited(vdev)) { |
| 1039 | mask = POLLERR; |
| 1040 | } else if (vdev->poll_wake) { |
| 1041 | vdev->poll_wake = 0; |
| 1042 | mask = POLLIN | POLLOUT; |
| 1043 | } |
| 1044 | done: |
| 1045 | mutex_unlock(&vdev->vdev_mutex); |
| 1046 | return mask; |
| 1047 | } |
| 1048 | |
| 1049 | static inline int |
| 1050 | vop_query_offset(struct vop_vdev *vdev, unsigned long offset, |
| 1051 | unsigned long *size, unsigned long *pa) |
| 1052 | { |
| 1053 | struct vop_device *vpdev = vdev->vpdev; |
| 1054 | unsigned long start = MIC_DP_SIZE; |
| 1055 | int i; |
| 1056 | |
| 1057 | /* |
| 1058 | * MMAP interface is as follows: |
| 1059 | * offset region |
| 1060 | * 0x0 virtio device_page |
| 1061 | * 0x1000 first vring |
| 1062 | * 0x1000 + size of 1st vring second vring |
| 1063 | * .... |
| 1064 | */ |
| 1065 | if (!offset) { |
| 1066 | *pa = virt_to_phys(vpdev->hw_ops->get_dp(vpdev)); |
| 1067 | *size = MIC_DP_SIZE; |
| 1068 | return 0; |
| 1069 | } |
| 1070 | |
| 1071 | for (i = 0; i < vdev->dd->num_vq; i++) { |
| 1072 | struct vop_vringh *vvr = &vdev->vvr[i]; |
| 1073 | |
| 1074 | if (offset == start) { |
| 1075 | *pa = virt_to_phys(vvr->vring.va); |
| 1076 | *size = vvr->vring.len; |
| 1077 | return 0; |
| 1078 | } |
| 1079 | start += vvr->vring.len; |
| 1080 | } |
| 1081 | return -1; |
| 1082 | } |
| 1083 | |
| 1084 | /* |
| 1085 | * Maps the device page and virtio rings to user space for readonly access. |
| 1086 | */ |
| 1087 | static int vop_mmap(struct file *f, struct vm_area_struct *vma) |
| 1088 | { |
| 1089 | struct vop_vdev *vdev = f->private_data; |
| 1090 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; |
| 1091 | unsigned long pa, size = vma->vm_end - vma->vm_start, size_rem = size; |
| 1092 | int i, err; |
| 1093 | |
| 1094 | err = vop_vdev_inited(vdev); |
| 1095 | if (err) |
| 1096 | goto ret; |
| 1097 | if (vma->vm_flags & VM_WRITE) { |
| 1098 | err = -EACCES; |
| 1099 | goto ret; |
| 1100 | } |
| 1101 | while (size_rem) { |
| 1102 | i = vop_query_offset(vdev, offset, &size, &pa); |
| 1103 | if (i < 0) { |
| 1104 | err = -EINVAL; |
| 1105 | goto ret; |
| 1106 | } |
| 1107 | err = remap_pfn_range(vma, vma->vm_start + offset, |
| 1108 | pa >> PAGE_SHIFT, size, |
| 1109 | vma->vm_page_prot); |
| 1110 | if (err) |
| 1111 | goto ret; |
| 1112 | size_rem -= size; |
| 1113 | offset += size; |
| 1114 | } |
| 1115 | ret: |
| 1116 | return err; |
| 1117 | } |
| 1118 | |
| 1119 | static const struct file_operations vop_fops = { |
| 1120 | .open = vop_open, |
| 1121 | .release = vop_release, |
| 1122 | .unlocked_ioctl = vop_ioctl, |
| 1123 | .poll = vop_poll, |
| 1124 | .mmap = vop_mmap, |
| 1125 | .owner = THIS_MODULE, |
| 1126 | }; |
| 1127 | |
| 1128 | int vop_host_init(struct vop_info *vi) |
| 1129 | { |
| 1130 | int rc; |
| 1131 | struct miscdevice *mdev; |
| 1132 | struct vop_device *vpdev = vi->vpdev; |
| 1133 | |
| 1134 | INIT_LIST_HEAD(&vi->vdev_list); |
| 1135 | vi->dma_ch = vpdev->dma_ch; |
| 1136 | mdev = &vi->miscdev; |
| 1137 | mdev->minor = MISC_DYNAMIC_MINOR; |
| 1138 | snprintf(vi->name, sizeof(vi->name), "vop_virtio%d", vpdev->index); |
| 1139 | mdev->name = vi->name; |
| 1140 | mdev->fops = &vop_fops; |
| 1141 | mdev->parent = &vpdev->dev; |
| 1142 | |
| 1143 | rc = misc_register(mdev); |
| 1144 | if (rc) |
| 1145 | dev_err(&vpdev->dev, "%s failed rc %d\n", __func__, rc); |
| 1146 | return rc; |
| 1147 | } |
| 1148 | |
| 1149 | void vop_host_uninit(struct vop_info *vi) |
| 1150 | { |
| 1151 | struct list_head *pos, *tmp; |
| 1152 | struct vop_vdev *vdev; |
| 1153 | |
| 1154 | mutex_lock(&vi->vop_mutex); |
| 1155 | vop_virtio_reset_devices(vi); |
| 1156 | list_for_each_safe(pos, tmp, &vi->vdev_list) { |
| 1157 | vdev = list_entry(pos, struct vop_vdev, list); |
| 1158 | list_del(pos); |
| 1159 | reinit_completion(&vdev->destroy); |
| 1160 | mutex_unlock(&vi->vop_mutex); |
| 1161 | mutex_lock(&vdev->vdev_mutex); |
| 1162 | vop_virtio_del_device(vdev); |
| 1163 | vdev->deleted = true; |
| 1164 | mutex_unlock(&vdev->vdev_mutex); |
| 1165 | complete(&vdev->destroy); |
| 1166 | mutex_lock(&vi->vop_mutex); |
| 1167 | } |
| 1168 | mutex_unlock(&vi->vop_mutex); |
| 1169 | misc_deregister(&vi->miscdev); |
| 1170 | } |