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800f879a AT |
1 | /* |
2 | * Copyright (C) 2009 Red Hat, Inc. | |
3 | * Author: Michael S. Tsirkin <mst@redhat.com> | |
4 | * | |
5 | * This work is licensed under the terms of the GNU GPL, version 2. | |
6 | ||
7 | * (C) Badari Pulavarty pbadari@us.ibm.com 2010 with the following comment. | |
8 | * He posted on http://lwn.net/Articles/382543/ | |
9 | ||
10 | * virtio-block server in host kernel. | |
11 | * Inspired by vhost-net and shamlessly ripped code from it :) | |
12 | ||
13 | * For adapting to MIC | |
14 | * (C) Copyright 2012 Intel Corporation | |
15 | * Author: Caz Yokoyama <Caz.Yokoyama@intel.com> | |
16 | */ | |
17 | #include <linux/version.h> | |
18 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,34) || \ | |
19 | defined(RHEL_RELEASE_CODE) | |
20 | ||
21 | #include <linux/compat.h> | |
22 | #include <linux/eventfd.h> | |
23 | #include <linux/vhost.h> | |
24 | #include <linux/virtio_ring.h> | |
25 | #include <linux/virtio_net.h> | |
26 | #include <linux/virtio_blk.h> | |
27 | #include <linux/mmu_context.h> | |
28 | #include <linux/miscdevice.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/mutex.h> | |
31 | #include <linux/workqueue.h> | |
32 | #include <linux/rcupdate.h> | |
33 | #include <linux/file.h> | |
34 | #include <linux/fdtable.h> | |
35 | ||
36 | #ifndef VIRTIO_RING_F_EVENT_IDX /* virtio_ring.h of rhel6.0 does not define */ | |
37 | #define VIRTIO_RING_F_EVENT_IDX 29 | |
38 | #endif | |
39 | #include "mic_common.h" | |
40 | #include "mic/micveth_dma.h" | |
41 | #include "vhost.h" | |
42 | #include "mic/mic_virtio.h" | |
43 | ||
44 | #define SECTOR_SHIFT 9 | |
45 | #define SECTOR_SIZE (1UL << SECTOR_SHIFT) | |
46 | #define VIRTIO_BLK_QUEUE_SIZE 128 | |
47 | #define DISK_SEG_MAX (VIRTIO_BLK_QUEUE_SIZE - 2) | |
48 | ||
49 | #define VHOST_BLK_VQ_MAX 1 | |
50 | #define WQNAME_SIZE 16 | |
51 | ||
52 | struct vhost_blk { | |
53 | struct vhost_dev dev; | |
54 | struct vhost_virtqueue vqs[VHOST_BLK_VQ_MAX]; | |
55 | struct vhost_poll poll[VHOST_BLK_VQ_MAX]; | |
56 | struct workqueue_struct *vb_wq; | |
57 | char vb_wqname[WQNAME_SIZE]; | |
58 | struct work_struct vb_ws_bh; | |
59 | struct workqueue_struct *vblk_workqueue; | |
60 | struct board_info *bd_info; | |
61 | char *file_name; | |
62 | struct file *virtblk_file; | |
63 | }; | |
64 | ||
65 | struct vhost_blk_io { | |
66 | struct list_head list; | |
67 | struct work_struct work; | |
68 | struct vhost_blk *blk; | |
69 | struct file *file; | |
70 | int head; | |
71 | uint32_t type; | |
72 | uint32_t nvecs; | |
73 | uint64_t sector; | |
74 | uint64_t len; | |
75 | struct iovec iov[0]; | |
76 | }; | |
77 | ||
78 | #define mic_addr_in_host(va, pa) ((u8 *)(va) + (u64)(pa)) | |
79 | ||
80 | static LIST_HEAD(write_queue); | |
81 | static LIST_HEAD(read_queue); | |
82 | ||
83 | static void | |
84 | cleanup_vblk_workqueue(struct vhost_blk_io *vbio, struct vhost_virtqueue *vq) | |
85 | { | |
86 | struct list_head single, *head, *node, *tmp; | |
87 | int need_free; | |
88 | struct vhost_blk_io *entry; | |
89 | ||
90 | if (vbio->head != -1) { | |
91 | INIT_LIST_HEAD(&single); | |
92 | list_add(&vbio->list, &single); | |
93 | head = &single; | |
94 | need_free = 0; | |
95 | } else { | |
96 | head = &vbio->list; | |
97 | need_free = 1; | |
98 | } | |
99 | ||
100 | mutex_lock(&vq->mutex); | |
101 | list_for_each_safe(node, tmp, head) { | |
102 | entry = list_entry(node, struct vhost_blk_io, list); | |
103 | list_del(node); | |
104 | kfree(entry); | |
105 | } | |
106 | mutex_unlock(&vq->mutex); | |
107 | ||
108 | if (need_free) | |
109 | kfree(vbio); | |
110 | } | |
111 | ||
112 | static void handle_io_work(struct work_struct *work) | |
113 | { | |
114 | struct vhost_blk_io *vbio, *entry; | |
115 | struct vhost_virtqueue *vq; | |
116 | struct vhost_blk *blk; | |
117 | struct list_head single, *head, *node, *tmp; | |
118 | struct iovec *iov; | |
119 | uint8_t *aper_va; | |
120 | struct vring *vring; | |
121 | unsigned int num; | |
122 | ||
123 | int need_free, ret = 0; | |
124 | loff_t pos; | |
125 | uint8_t status = 0; | |
126 | ||
127 | vbio = container_of(work, struct vhost_blk_io, work); | |
128 | blk = vbio->blk; | |
129 | vq = &blk->dev.vqs[0]; | |
130 | pos = vbio->sector << SECTOR_SHIFT; | |
131 | aper_va = blk->bd_info->bi_ctx.aper.va; | |
132 | ||
133 | vring = &((struct mic_virtblk *)blk->bd_info->bi_virtio)->vb_shared.vring; | |
134 | num = readl(&vring->num); | |
135 | if (num == 0 || micpm_get_reference(&blk->bd_info->bi_ctx, true)) { | |
136 | cleanup_vblk_workqueue(vbio, vq); | |
137 | return; | |
138 | } | |
139 | ||
140 | if (atomic64_read(&vbio->file->f_count) == 0) { /* file is closed */ | |
141 | ret = -1; | |
142 | } else if (vbio->type & VIRTIO_BLK_T_FLUSH) { | |
143 | #ifdef RHEL_RELEASE_CODE | |
144 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)) | |
145 | ret = vfs_fsync(vbio->file, 1); | |
146 | #else | |
147 | ret = vfs_fsync(vbio->file, vbio->file->f_path.dentry, 1); | |
148 | #endif | |
149 | #else | |
150 | ret = vfs_fsync(vbio->file, 1); | |
151 | #endif | |
152 | } else if (vbio->type & VIRTIO_BLK_T_OUT) { | |
153 | for (iov = vbio->iov; iov < &vbio->iov[vbio->nvecs]; iov++) { | |
154 | iov->iov_base = mic_addr_in_host(aper_va, iov->iov_base); | |
155 | } | |
156 | ret = vfs_writev(vbio->file, vbio->iov, vbio->nvecs, &pos); | |
157 | } else { | |
158 | for (iov = vbio->iov; iov < &vbio->iov[vbio->nvecs]; iov++) { | |
159 | iov->iov_base = mic_addr_in_host(aper_va, iov->iov_base); | |
160 | } | |
161 | ret = vfs_readv(vbio->file, vbio->iov, vbio->nvecs, &pos); | |
162 | } | |
163 | status = (ret < 0) ? VIRTIO_BLK_S_IOERR : VIRTIO_BLK_S_OK; | |
164 | if (vbio->head != -1) { | |
165 | INIT_LIST_HEAD(&single); | |
166 | list_add(&vbio->list, &single); | |
167 | head = &single; | |
168 | need_free = 0; | |
169 | } else { | |
170 | head = &vbio->list; | |
171 | need_free = 1; | |
172 | } | |
173 | list_for_each_entry(entry, head, list) { | |
174 | memcpy_toio(mic_addr_in_host(aper_va, entry->iov[entry->nvecs].iov_base), &status, sizeof(status)); | |
175 | } | |
176 | mutex_lock(&vq->mutex); | |
177 | list_for_each_safe(node, tmp, head) { | |
178 | entry = list_entry(node, struct vhost_blk_io, list); | |
179 | vhost_add_used_and_signal(&blk->dev, vq, entry->head, ret); | |
180 | list_del(node); | |
181 | kfree(entry); | |
182 | } | |
183 | mutex_unlock(&vq->mutex); | |
184 | if (need_free) | |
185 | kfree(vbio); | |
186 | micpm_put_reference(&blk->bd_info->bi_ctx); | |
187 | } | |
188 | ||
189 | static struct vhost_blk_io *allocate_vbio(int nvecs) | |
190 | { | |
191 | struct vhost_blk_io *vbio; | |
192 | int size = sizeof(struct vhost_blk_io) + nvecs * sizeof(struct iovec); | |
193 | vbio = kmalloc(size, GFP_KERNEL); | |
194 | if (vbio) { | |
195 | INIT_WORK(&vbio->work, handle_io_work); | |
196 | INIT_LIST_HEAD(&vbio->list); | |
197 | } | |
198 | return vbio; | |
199 | } | |
200 | ||
201 | static void merge_and_handoff_work(struct list_head *queue) | |
202 | { | |
203 | struct vhost_blk_io *vbio, *entry; | |
204 | int nvecs = 0; | |
205 | int entries = 0; | |
206 | ||
207 | list_for_each_entry(entry, queue, list) { | |
208 | nvecs += entry->nvecs; | |
209 | entries++; | |
210 | } | |
211 | ||
212 | if (entries == 1) { | |
213 | vbio = list_first_entry(queue, struct vhost_blk_io, list); | |
214 | list_del(&vbio->list); | |
215 | queue_work(vbio->blk->vblk_workqueue, &vbio->work); | |
216 | return; | |
217 | } | |
218 | ||
219 | vbio = allocate_vbio(nvecs); | |
220 | if (!vbio) { | |
221 | /* Unable to allocate memory - submit IOs individually */ | |
222 | list_for_each_entry(vbio, queue, list) { | |
223 | queue_work(vbio->blk->vblk_workqueue, &vbio->work); | |
224 | } | |
225 | INIT_LIST_HEAD(queue); | |
226 | return; | |
227 | } | |
228 | ||
229 | entry = list_first_entry(queue, struct vhost_blk_io, list); | |
230 | vbio->nvecs = nvecs; | |
231 | vbio->blk = entry->blk; | |
232 | vbio->file = entry->file; | |
233 | vbio->type = entry->type; | |
234 | vbio->sector = entry->sector; | |
235 | vbio->head = -1; | |
236 | vbio->len = 0; | |
237 | nvecs = 0; | |
238 | ||
239 | list_for_each_entry(entry, queue, list) { | |
240 | memcpy(&vbio->iov[nvecs], entry->iov, entry->nvecs * sizeof(struct iovec)); | |
241 | nvecs += entry->nvecs; | |
242 | vbio->len += entry->len; | |
243 | } | |
244 | list_replace_init(queue, &vbio->list); | |
245 | queue_work(vbio->blk->vblk_workqueue, &vbio->work); | |
246 | } | |
247 | ||
248 | static void start_io(struct list_head *queue) | |
249 | { | |
250 | struct list_head start; | |
251 | struct vhost_blk_io *vbio = NULL, *entry; | |
252 | ||
253 | if (list_empty(queue)) | |
254 | return; | |
255 | ||
256 | list_for_each_entry(entry, queue, list) { | |
257 | if (!vbio) { | |
258 | vbio = entry; | |
259 | continue; | |
260 | } | |
261 | if (vbio->sector + (vbio->len >> SECTOR_SHIFT) == entry->sector) { | |
262 | vbio = entry; | |
263 | } else { | |
264 | INIT_LIST_HEAD(&start); | |
265 | list_cut_position(&start, queue, &vbio->list); | |
266 | merge_and_handoff_work(&start); | |
267 | vbio = entry; | |
268 | } | |
269 | } | |
270 | if (!list_empty(queue)) | |
271 | merge_and_handoff_work(queue); | |
272 | } | |
273 | ||
274 | static uint64_t calculate_len(struct iovec *iov, int nvecs) | |
275 | { | |
276 | uint64_t len = 0; | |
277 | int i; | |
278 | ||
279 | for (i=0; i<nvecs; i++) | |
280 | len += iov[i].iov_len; | |
281 | return len; | |
282 | } | |
283 | ||
284 | static void insert_to_queue(struct vhost_blk_io *vbio, | |
285 | struct list_head *queue) | |
286 | { | |
287 | struct vhost_blk_io *entry; | |
288 | ||
289 | list_for_each_entry(entry, queue, list) { | |
290 | if (entry->sector > vbio->sector) | |
291 | break; | |
292 | } | |
293 | list_add_tail(&vbio->list, &entry->list); | |
294 | } | |
295 | ||
296 | static int handoff_io(struct vhost_blk *blk, int head, | |
297 | uint32_t type, uint64_t sector, | |
298 | struct iovec *iov, int nvecs) | |
299 | { | |
300 | struct vhost_virtqueue *vq = &blk->dev.vqs[0]; | |
301 | struct vhost_blk_io *vbio; | |
302 | ||
303 | vbio = allocate_vbio(nvecs+1); | |
304 | if (!vbio) { | |
305 | return -ENOMEM; | |
306 | } | |
307 | vbio->blk = blk; | |
308 | vbio->head = head; | |
309 | vbio->file = vq->private_data; | |
310 | vbio->type = type; | |
311 | vbio->sector = sector; | |
312 | vbio->nvecs = nvecs; | |
313 | vbio->len = calculate_len(iov, nvecs); | |
314 | memcpy(vbio->iov, iov, (nvecs + 1) * sizeof(struct iovec)); | |
315 | ||
316 | if (vbio->type & VIRTIO_BLK_T_FLUSH) { | |
317 | #if 0 | |
318 | /* Sync called - do I need to submit IOs in the queue ? */ | |
319 | start_io(&read_queue); | |
320 | start_io(&write_queue); | |
321 | #endif | |
322 | queue_work(blk->vblk_workqueue, &vbio->work); | |
323 | } else if (vbio->type & VIRTIO_BLK_T_OUT) { | |
324 | insert_to_queue(vbio, &write_queue); | |
325 | } else { | |
326 | insert_to_queue(vbio, &read_queue); | |
327 | } | |
328 | return 0; | |
329 | } | |
330 | ||
331 | static void handle_blk(struct vhost_blk *blk) | |
332 | { | |
333 | struct vhost_virtqueue *vq = &blk->dev.vqs[0]; | |
334 | unsigned head, out, in; | |
335 | struct virtio_blk_outhdr hdr; | |
336 | int nvecs; | |
337 | struct board_info *bd_info = blk->bd_info; | |
338 | struct vring *vring; | |
339 | ||
340 | vring = &((struct mic_virtblk *)bd_info->bi_virtio)->vb_shared.vring; | |
341 | if (vring == 0 || readl(&vring->num) == 0) { | |
342 | printk("request comes in while card side driver is not loaded yet. Ignore\n"); | |
343 | return; | |
344 | } | |
345 | /* the first time since the card side driver becomes ready */ | |
346 | if (vq->desc == NULL || readb(&((struct mic_virtblk *)bd_info->bi_virtio)->vb_shared.update)) { | |
347 | vq->num = readl(&vring->num); | |
348 | vq->desc = (struct vring_desc *)readq(&vring->desc); | |
349 | vq->avail = (struct vring_avail *)readq(&vring->avail); | |
350 | vq->used = (struct vring_used *)readq(&vring->used); | |
351 | vq->last_avail_idx = 0; | |
352 | vq->avail_idx = 0; | |
353 | vq->last_used_idx = 0; | |
354 | vq->signalled_used = 0; | |
355 | vq->signalled_used_valid = false; | |
356 | vq->done_idx = 0; | |
357 | writeb(false, &((struct mic_virtblk *)bd_info->bi_virtio)->vb_shared.update); | |
358 | } | |
359 | ||
360 | if (micpm_get_reference(&blk->bd_info->bi_ctx, true)) | |
361 | return; | |
362 | ||
363 | mutex_lock(&vq->mutex); | |
364 | ||
365 | vhost_disable_notify(&blk->dev, vq); | |
366 | ||
367 | for (;;) { | |
368 | head = vhost_get_vq_desc(&blk->dev, vq, vq->iov, | |
369 | ARRAY_SIZE(vq->iov), | |
370 | &out, &in, NULL, NULL); | |
371 | if ((head == vq->num) || (head == -EFAULT) || (head == -EINVAL)) { | |
372 | if (unlikely(vhost_enable_notify(&blk->dev, vq))) { | |
373 | vhost_disable_notify(&blk->dev, vq); | |
374 | continue; | |
375 | } | |
376 | start_io(&read_queue); | |
377 | start_io(&write_queue); | |
378 | break; | |
379 | } | |
380 | ||
381 | BUG_ON(vq->iov[0].iov_len != 16); | |
382 | ||
383 | memcpy_fromio(&hdr, mic_addr_in_host(bd_info->bi_ctx.aper.va, vq->iov[0].iov_base), | |
384 | sizeof(hdr)); | |
385 | ||
386 | nvecs = out - 1; | |
387 | if (hdr.type == VIRTIO_BLK_T_IN) | |
388 | nvecs = in - 1; | |
389 | ||
390 | BUG_ON(vq->iov[nvecs+1].iov_len != 1); | |
391 | if (handoff_io(blk, head, hdr.type, hdr.sector, &vq->iov[1], nvecs) < 0) { | |
392 | vhost_discard_vq_desc(vq, 1); | |
393 | continue; | |
394 | } | |
395 | } | |
396 | mutex_unlock(&vq->mutex); | |
397 | micpm_put_reference(&blk->bd_info->bi_ctx); | |
398 | } | |
399 | ||
400 | static void handle_blk_kick(struct work_struct *work) | |
401 | { | |
402 | struct vhost_blk *vblk; | |
403 | ||
404 | vblk = container_of(work, struct vhost_blk, vb_ws_bh); | |
405 | handle_blk(vblk); | |
406 | } | |
407 | ||
408 | #if 0 | |
409 | static void handle_rq_blk(struct vhost_work *work) | |
410 | { | |
411 | struct vhost_blk *blk; | |
412 | ||
413 | blk = container_of(work, struct vhost_blk, poll[0].work); | |
414 | handle_blk(blk); | |
415 | } | |
416 | #endif | |
417 | ||
418 | static int | |
419 | vhost_doorbell_intr_handler(mic_ctx_t *mic_ctx, int doorbell) | |
420 | { | |
421 | struct board_info *bi; | |
422 | struct vhost_blk *vblk; | |
423 | ||
424 | bi = container_of(mic_ctx, struct board_info, bi_ctx); | |
425 | vblk = ((struct mic_virtblk *)bi->bi_virtio)->vblk; | |
426 | queue_work(vblk->vb_wq, &vblk->vb_ws_bh); | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
431 | static long vhost_blk_set_backend(struct vhost_blk *vblk) | |
432 | { | |
433 | struct vhost_virtqueue *vq; | |
434 | struct board_info *bd_info = vblk->bd_info; | |
435 | unsigned index = bd_info->bi_ctx.bi_id; | |
436 | struct vb_shared *vb_shared; | |
437 | int ret = 0; | |
438 | struct kstat stat; | |
439 | unsigned int virtio_blk_features = (1U << VIRTIO_BLK_F_SEG_MAX) | | |
440 | (1U << VIRTIO_BLK_F_BLK_SIZE); | |
441 | ||
442 | if (index >= MAX_BOARD_SUPPORTED) { | |
443 | ret = -ENOBUFS; | |
444 | goto _exit_; | |
445 | } | |
446 | if (vblk->virtblk_file == NULL) { | |
447 | ret = -EBADF; | |
448 | goto _exit_; | |
449 | } | |
450 | ||
451 | vq = &vblk->vqs[0]; | |
452 | mutex_lock(&vq->mutex); | |
453 | rcu_assign_pointer(vq->private_data, vblk->virtblk_file); | |
454 | mutex_unlock(&vq->mutex); | |
455 | ||
456 | snprintf(vblk->vb_wqname, sizeof(vblk->vb_wqname), | |
457 | "virtblk wq %d", index); | |
458 | vblk->vb_wq = __mic_create_singlethread_workqueue(vblk->vb_wqname); | |
459 | if (vblk->vb_wq == NULL) { | |
460 | ret = -ENOMEM; | |
461 | goto _exit_; | |
462 | } | |
463 | INIT_WORK(&vblk->vb_ws_bh, handle_blk_kick); | |
464 | ||
465 | /* They have to be accessed from "struct vhost_virtqueue *vq" in mic_vhost.c. | |
466 | They are not used in vhost block. I don't modify vhost.h. */ | |
467 | vq->log_base = (void __user *)&bd_info->bi_ctx; | |
468 | vq->log_addr = (u64)bd_info->bi_ctx.aper.va; | |
469 | ||
470 | vb_shared = &((struct mic_virtblk *)bd_info->bi_virtio)->vb_shared; | |
471 | #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,6,0)) | |
472 | virtio_blk_features |= (1U << VIRTIO_BLK_F_FLUSH); | |
473 | #endif | |
474 | writel(virtio_blk_features, &vb_shared->host_features); | |
475 | writel(DISK_SEG_MAX, &vb_shared->blk_config.seg_max); | |
476 | writel(SECTOR_SIZE, &vb_shared->blk_config.blk_size); | |
477 | ||
478 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0)) | |
479 | ret = vfs_getattr(&vblk->virtblk_file->f_path, &stat); | |
480 | #else | |
481 | ret = vfs_getattr(vblk->virtblk_file->f_path.mnt, | |
482 | vblk->virtblk_file->f_path.dentry, &stat); | |
483 | #endif | |
484 | if (ret < 0) | |
485 | goto _exit_; | |
486 | ||
487 | if (S_ISBLK(stat.mode)) { | |
488 | writel(i_size_read(I_BDEV(vblk->virtblk_file->f_mapping->host)->bd_inode) / SECTOR_SIZE, | |
489 | &vb_shared->blk_config.capacity); | |
490 | } else { | |
491 | writel(stat.size / SECTOR_SIZE, &vb_shared->blk_config.capacity); | |
492 | } | |
493 | ||
494 | ret = mic_reg_irqhandler(&bd_info->bi_ctx, MIC_IRQ_DB2, "Host DoorBell 2", | |
495 | vhost_doorbell_intr_handler); | |
496 | ||
497 | _exit_: | |
498 | return ret; | |
499 | } | |
500 | ||
501 | void | |
502 | mic_vhost_blk_stop(bd_info_t *bd_info) | |
503 | { | |
504 | struct vring *vring = &((struct mic_virtblk *)bd_info->bi_virtio)->vb_shared.vring; | |
505 | ||
506 | writel(0, &vring->num); /* reject subsequent request from MIC card */ | |
507 | } | |
508 | ||
509 | extern bd_info_t *dev_to_bdi(struct device *dev); | |
510 | ||
511 | ssize_t | |
512 | show_virtblk_file(struct device *dev, struct device_attribute *attr, char *buf) | |
513 | { | |
514 | struct board_info *bd_info = dev_to_bdi(dev); | |
515 | struct mic_virtblk *mic_virtblk; | |
516 | struct vhost_blk *vblk; | |
517 | ||
518 | BUG_ON(bd_info == NULL); | |
519 | mic_virtblk = bd_info->bi_virtio; | |
520 | BUG_ON(mic_virtblk == NULL); | |
521 | vblk = mic_virtblk->vblk; | |
522 | BUG_ON(vblk == NULL); | |
523 | ||
524 | if (vblk->file_name != NULL) | |
525 | return snprintf(buf, PAGE_SIZE, "%s\n", vblk->file_name); | |
526 | else | |
527 | return 0; | |
528 | } | |
529 | ||
530 | ssize_t | |
531 | store_virtblk_file(struct device *dev, struct device_attribute *attr, | |
532 | const char *buf, size_t count) | |
533 | { | |
534 | int ret = 0; | |
535 | struct board_info *bd_info = dev_to_bdi(dev); | |
536 | struct mic_virtblk *mic_virtblk; | |
537 | struct vhost_blk *vblk; | |
538 | struct vhost_virtqueue *vq; | |
539 | char *p; | |
540 | struct file *virtblk_file; | |
541 | ||
542 | BUG_ON(bd_info == NULL); | |
543 | mic_virtblk = bd_info->bi_virtio; | |
544 | BUG_ON(mic_virtblk == NULL); | |
545 | vblk = mic_virtblk->vblk; | |
546 | BUG_ON(vblk == NULL); | |
547 | vq = &vblk->vqs[0]; | |
548 | BUG_ON(vq == NULL); | |
549 | ||
550 | if (buf == NULL) { | |
551 | ret = -EINVAL; | |
552 | goto _return_; | |
553 | } | |
554 | if (count <= 1) { | |
555 | ret = -EINVAL; | |
556 | goto _return_; | |
557 | } | |
558 | ||
559 | p = strchr(buf, '\n'); | |
560 | if (p != NULL) | |
561 | *p = '\0'; | |
562 | ||
563 | mutex_lock(&vq->mutex); | |
564 | if (vblk->virtblk_file != NULL) { /* if virtblk file is already assigned */ | |
565 | printk(KERN_ALERT "you are changing virtblk file: %s -> %s.\n", vblk->file_name, buf); | |
566 | kfree(vblk->file_name); | |
567 | vblk->file_name = NULL; | |
568 | filp_close(vblk->virtblk_file, current->files); | |
569 | vblk->virtblk_file = NULL; | |
570 | } | |
571 | ||
572 | vblk->file_name = kmalloc(count + 1, GFP_KERNEL); | |
573 | strcpy(vblk->file_name, buf); | |
574 | virtblk_file = filp_open(vblk->file_name, O_RDWR|O_LARGEFILE, 0); | |
575 | if (IS_ERR(virtblk_file)) { | |
576 | ret = PTR_ERR(virtblk_file); | |
577 | mutex_unlock(&vq->mutex); | |
578 | goto free_file_name; | |
579 | } | |
580 | vblk->virtblk_file = virtblk_file; | |
581 | mutex_unlock(&vq->mutex); | |
582 | ||
583 | ret = vhost_blk_set_backend(vblk); | |
584 | if (ret < 0) | |
585 | goto close_virtblk_file; | |
586 | ||
587 | return count; | |
588 | ||
589 | close_virtblk_file: | |
590 | filp_close(vblk->virtblk_file, current->files); | |
591 | free_file_name: | |
592 | kfree(vblk->file_name); | |
593 | _return_: | |
594 | return ret; | |
595 | } | |
596 | ||
597 | int mic_vhost_blk_probe(bd_info_t *bd_info) | |
598 | { | |
599 | int ret = 0; | |
600 | char wq_name[8]; | |
601 | struct mic_virtblk *mic_virtblk; | |
602 | struct vhost_blk *vblk; | |
603 | ||
604 | mic_virtblk = kzalloc(sizeof(*mic_virtblk), GFP_KERNEL); | |
605 | if (mic_virtblk == NULL) { | |
606 | ret = -ENOMEM; | |
607 | goto err_vblk; | |
608 | } | |
609 | bd_info->bi_virtio = mic_virtblk; | |
610 | ||
611 | vblk = kzalloc(sizeof *vblk, GFP_KERNEL); | |
612 | if (vblk == NULL) { | |
613 | ret = -ENOMEM; | |
614 | goto free_mic_virtblk; | |
615 | } | |
616 | mic_virtblk->vblk = vblk; | |
617 | vblk->bd_info = bd_info; | |
618 | ||
619 | ret = vhost_dev_init(&vblk->dev, vblk->vqs, VHOST_BLK_VQ_MAX); | |
620 | if (ret < 0) | |
621 | goto free_vblk; | |
622 | ||
623 | #if 0 | |
624 | vhost_poll_init(vblk->poll, handle_rq_blk, POLLOUT|POLLIN, &vblk->dev); | |
625 | #endif | |
626 | ||
627 | BUG_ON(bd_info->bi_ctx.bi_id >= 1000); | |
628 | snprintf(wq_name, ARRAY_SIZE(wq_name), "vblk%03d", bd_info->bi_ctx.bi_id); | |
629 | vblk->vblk_workqueue = __mic_create_singlethread_workqueue(wq_name); | |
630 | if (vblk->vblk_workqueue == NULL) { | |
631 | ret = -ENOMEM; | |
632 | goto free_vblk; | |
633 | } | |
634 | ||
635 | return ret; | |
636 | ||
637 | free_vblk: | |
638 | kfree(vblk); | |
639 | free_mic_virtblk: | |
640 | kfree(mic_virtblk); | |
641 | err_vblk: | |
642 | return ret; | |
643 | } | |
644 | ||
645 | void mic_vhost_blk_remove(bd_info_t *bd_info) | |
646 | { | |
647 | struct mic_virtblk *mic_virtblk = bd_info->bi_virtio; | |
648 | struct vhost_blk *vblk = mic_virtblk->vblk; | |
649 | struct vb_shared *vb_shared = &mic_virtblk->vb_shared; | |
650 | ||
651 | if (vblk->virtblk_file != NULL) { | |
652 | mic_unreg_irqhandler(&bd_info->bi_ctx, MIC_IRQ_DB2, "Host DoorBell 2"); | |
653 | memset(&vb_shared->blk_config, 0, sizeof(vb_shared->blk_config)); | |
654 | destroy_workqueue(vblk->vb_wq); | |
655 | if (vblk->vqs[0].private_data != NULL) | |
656 | fput(vblk->vqs[0].private_data); | |
657 | kfree(vblk->file_name); | |
658 | filp_close(vblk->virtblk_file, current->files); | |
659 | } | |
660 | vhost_dev_cleanup(&vblk->dev); | |
661 | destroy_workqueue(vblk->vblk_workqueue); | |
662 | kfree(vblk); | |
663 | kfree(mic_virtblk); | |
664 | } | |
665 | #endif |