Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1 | /* |
| 2 | * ccw based virtio transport |
| 3 | * |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 4 | * Copyright IBM Corp. 2012, 2014 |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 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 only) |
| 8 | * as published by the Free Software Foundation. |
| 9 | * |
| 10 | * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel_stat.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/bootmem.h> |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/virtio.h> |
| 18 | #include <linux/virtio_config.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | #include <linux/virtio_ring.h> |
| 22 | #include <linux/pfn.h> |
| 23 | #include <linux/async.h> |
| 24 | #include <linux/wait.h> |
| 25 | #include <linux/list.h> |
| 26 | #include <linux/bitops.h> |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/io.h> |
| 29 | #include <linux/kvm_para.h> |
Heinz Graalfs | e75279c | 2014-04-28 11:24:05 +0930 | [diff] [blame] | 30 | #include <linux/notifier.h> |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 31 | #include <asm/setup.h> |
| 32 | #include <asm/irq.h> |
| 33 | #include <asm/cio.h> |
| 34 | #include <asm/ccwdev.h> |
Cornelia Huck | 6a773cb | 2013-02-28 12:33:17 +0100 | [diff] [blame] | 35 | #include <asm/virtio-ccw.h> |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 36 | #include <asm/isc.h> |
| 37 | #include <asm/airq.h> |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 38 | |
| 39 | /* |
| 40 | * virtio related functions |
| 41 | */ |
| 42 | |
| 43 | struct vq_config_block { |
| 44 | __u16 index; |
| 45 | __u16 num; |
| 46 | } __packed; |
| 47 | |
| 48 | #define VIRTIO_CCW_CONFIG_SIZE 0x100 |
| 49 | /* same as PCI config space size, should be enough for all drivers */ |
| 50 | |
| 51 | struct virtio_ccw_device { |
| 52 | struct virtio_device vdev; |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 53 | __u8 *status; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 54 | __u8 config[VIRTIO_CCW_CONFIG_SIZE]; |
| 55 | struct ccw_device *cdev; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 56 | __u32 curr_io; |
| 57 | int err; |
Thomas Huth | 6bb2c83 | 2014-10-07 16:39:50 +0200 | [diff] [blame^] | 58 | unsigned int revision; /* Transport revision */ |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 59 | wait_queue_head_t wait_q; |
| 60 | spinlock_t lock; |
| 61 | struct list_head virtqueues; |
| 62 | unsigned long indicators; |
| 63 | unsigned long indicators2; |
| 64 | struct vq_config_block *config_block; |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 65 | bool is_thinint; |
Heinz Graalfs | 79629b2 | 2014-03-05 15:23:54 +0100 | [diff] [blame] | 66 | bool going_away; |
Heinz Graalfs | e75279c | 2014-04-28 11:24:05 +0930 | [diff] [blame] | 67 | bool device_lost; |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 68 | void *airq_info; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 69 | }; |
| 70 | |
| 71 | struct vq_info_block { |
| 72 | __u64 queue; |
| 73 | __u32 align; |
| 74 | __u16 index; |
| 75 | __u16 num; |
| 76 | } __packed; |
| 77 | |
| 78 | struct virtio_feature_desc { |
| 79 | __u32 features; |
| 80 | __u8 index; |
| 81 | } __packed; |
| 82 | |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 83 | struct virtio_thinint_area { |
| 84 | unsigned long summary_indicator; |
| 85 | unsigned long indicator; |
| 86 | u64 bit_nr; |
| 87 | u8 isc; |
| 88 | } __packed; |
| 89 | |
Thomas Huth | 6bb2c83 | 2014-10-07 16:39:50 +0200 | [diff] [blame^] | 90 | struct virtio_rev_info { |
| 91 | __u16 revision; |
| 92 | __u16 length; |
| 93 | __u8 data[]; |
| 94 | }; |
| 95 | |
| 96 | /* the highest virtio-ccw revision we support */ |
| 97 | #define VIRTIO_CCW_REV_MAX 0 |
| 98 | |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 99 | struct virtio_ccw_vq_info { |
| 100 | struct virtqueue *vq; |
| 101 | int num; |
| 102 | void *queue; |
| 103 | struct vq_info_block *info_block; |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 104 | int bit_nr; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 105 | struct list_head node; |
Michael S. Tsirkin | 07e1693 | 2013-02-28 12:33:16 +0100 | [diff] [blame] | 106 | long cookie; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 107 | }; |
| 108 | |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 109 | #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ |
| 110 | |
| 111 | #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) |
| 112 | #define MAX_AIRQ_AREAS 20 |
| 113 | |
| 114 | static int virtio_ccw_use_airq = 1; |
| 115 | |
| 116 | struct airq_info { |
| 117 | rwlock_t lock; |
| 118 | u8 summary_indicator; |
| 119 | struct airq_struct airq; |
| 120 | struct airq_iv *aiv; |
| 121 | }; |
| 122 | static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; |
| 123 | |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 124 | #define CCW_CMD_SET_VQ 0x13 |
| 125 | #define CCW_CMD_VDEV_RESET 0x33 |
| 126 | #define CCW_CMD_SET_IND 0x43 |
| 127 | #define CCW_CMD_SET_CONF_IND 0x53 |
| 128 | #define CCW_CMD_READ_FEAT 0x12 |
| 129 | #define CCW_CMD_WRITE_FEAT 0x11 |
| 130 | #define CCW_CMD_READ_CONF 0x22 |
| 131 | #define CCW_CMD_WRITE_CONF 0x21 |
| 132 | #define CCW_CMD_WRITE_STATUS 0x31 |
| 133 | #define CCW_CMD_READ_VQ_CONF 0x32 |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 134 | #define CCW_CMD_SET_IND_ADAPTER 0x73 |
Thomas Huth | 6bb2c83 | 2014-10-07 16:39:50 +0200 | [diff] [blame^] | 135 | #define CCW_CMD_SET_VIRTIO_REV 0x83 |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 136 | |
| 137 | #define VIRTIO_CCW_DOING_SET_VQ 0x00010000 |
| 138 | #define VIRTIO_CCW_DOING_RESET 0x00040000 |
| 139 | #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000 |
| 140 | #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000 |
| 141 | #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000 |
| 142 | #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000 |
| 143 | #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000 |
| 144 | #define VIRTIO_CCW_DOING_SET_IND 0x01000000 |
| 145 | #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000 |
| 146 | #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 147 | #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 |
Thomas Huth | 6bb2c83 | 2014-10-07 16:39:50 +0200 | [diff] [blame^] | 148 | #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 149 | #define VIRTIO_CCW_INTPARM_MASK 0xffff0000 |
| 150 | |
| 151 | static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) |
| 152 | { |
| 153 | return container_of(vdev, struct virtio_ccw_device, vdev); |
| 154 | } |
| 155 | |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 156 | static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info) |
| 157 | { |
| 158 | unsigned long i, flags; |
| 159 | |
| 160 | write_lock_irqsave(&info->lock, flags); |
| 161 | for (i = 0; i < airq_iv_end(info->aiv); i++) { |
| 162 | if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) { |
| 163 | airq_iv_free_bit(info->aiv, i); |
| 164 | airq_iv_set_ptr(info->aiv, i, 0); |
| 165 | break; |
| 166 | } |
| 167 | } |
| 168 | write_unlock_irqrestore(&info->lock, flags); |
| 169 | } |
| 170 | |
| 171 | static void virtio_airq_handler(struct airq_struct *airq) |
| 172 | { |
| 173 | struct airq_info *info = container_of(airq, struct airq_info, airq); |
| 174 | unsigned long ai; |
| 175 | |
| 176 | inc_irq_stat(IRQIO_VAI); |
| 177 | read_lock(&info->lock); |
| 178 | /* Walk through indicators field, summary indicator active. */ |
| 179 | for (ai = 0;;) { |
| 180 | ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); |
| 181 | if (ai == -1UL) |
| 182 | break; |
| 183 | vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); |
| 184 | } |
| 185 | info->summary_indicator = 0; |
| 186 | smp_wmb(); |
| 187 | /* Walk through indicators field, summary indicator not active. */ |
| 188 | for (ai = 0;;) { |
| 189 | ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); |
| 190 | if (ai == -1UL) |
| 191 | break; |
| 192 | vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); |
| 193 | } |
| 194 | read_unlock(&info->lock); |
| 195 | } |
| 196 | |
| 197 | static struct airq_info *new_airq_info(void) |
| 198 | { |
| 199 | struct airq_info *info; |
| 200 | int rc; |
| 201 | |
| 202 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
| 203 | if (!info) |
| 204 | return NULL; |
| 205 | rwlock_init(&info->lock); |
| 206 | info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR); |
| 207 | if (!info->aiv) { |
| 208 | kfree(info); |
| 209 | return NULL; |
| 210 | } |
| 211 | info->airq.handler = virtio_airq_handler; |
| 212 | info->airq.lsi_ptr = &info->summary_indicator; |
| 213 | info->airq.lsi_mask = 0xff; |
| 214 | info->airq.isc = VIRTIO_AIRQ_ISC; |
| 215 | rc = register_adapter_interrupt(&info->airq); |
| 216 | if (rc) { |
| 217 | airq_iv_release(info->aiv); |
| 218 | kfree(info); |
| 219 | return NULL; |
| 220 | } |
| 221 | return info; |
| 222 | } |
| 223 | |
| 224 | static void destroy_airq_info(struct airq_info *info) |
| 225 | { |
| 226 | if (!info) |
| 227 | return; |
| 228 | |
| 229 | unregister_adapter_interrupt(&info->airq); |
| 230 | airq_iv_release(info->aiv); |
| 231 | kfree(info); |
| 232 | } |
| 233 | |
| 234 | static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs, |
| 235 | u64 *first, void **airq_info) |
| 236 | { |
| 237 | int i, j; |
| 238 | struct airq_info *info; |
| 239 | unsigned long indicator_addr = 0; |
| 240 | unsigned long bit, flags; |
| 241 | |
| 242 | for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { |
| 243 | if (!airq_areas[i]) |
| 244 | airq_areas[i] = new_airq_info(); |
| 245 | info = airq_areas[i]; |
| 246 | if (!info) |
| 247 | return 0; |
| 248 | write_lock_irqsave(&info->lock, flags); |
| 249 | bit = airq_iv_alloc(info->aiv, nvqs); |
| 250 | if (bit == -1UL) { |
| 251 | /* Not enough vacancies. */ |
| 252 | write_unlock_irqrestore(&info->lock, flags); |
| 253 | continue; |
| 254 | } |
| 255 | *first = bit; |
| 256 | *airq_info = info; |
| 257 | indicator_addr = (unsigned long)info->aiv->vector; |
| 258 | for (j = 0; j < nvqs; j++) { |
| 259 | airq_iv_set_ptr(info->aiv, bit + j, |
| 260 | (unsigned long)vqs[j]); |
| 261 | } |
| 262 | write_unlock_irqrestore(&info->lock, flags); |
| 263 | } |
| 264 | return indicator_addr; |
| 265 | } |
| 266 | |
| 267 | static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) |
| 268 | { |
| 269 | struct virtio_ccw_vq_info *info; |
| 270 | |
| 271 | list_for_each_entry(info, &vcdev->virtqueues, node) |
| 272 | drop_airq_indicator(info->vq, vcdev->airq_info); |
| 273 | } |
| 274 | |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 275 | static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) |
| 276 | { |
| 277 | unsigned long flags; |
| 278 | __u32 ret; |
| 279 | |
| 280 | spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); |
| 281 | if (vcdev->err) |
| 282 | ret = 0; |
| 283 | else |
| 284 | ret = vcdev->curr_io & flag; |
| 285 | spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); |
| 286 | return ret; |
| 287 | } |
| 288 | |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 289 | static int ccw_io_helper(struct virtio_ccw_device *vcdev, |
| 290 | struct ccw1 *ccw, __u32 intparm) |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 291 | { |
| 292 | int ret; |
| 293 | unsigned long flags; |
| 294 | int flag = intparm & VIRTIO_CCW_INTPARM_MASK; |
| 295 | |
Christian Borntraeger | b26ba22 | 2013-01-07 15:51:52 +0100 | [diff] [blame] | 296 | do { |
| 297 | spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); |
| 298 | ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); |
Cornelia Huck | 99437a2 | 2013-04-04 10:25:06 +0200 | [diff] [blame] | 299 | if (!ret) { |
| 300 | if (!vcdev->curr_io) |
| 301 | vcdev->err = 0; |
Christian Borntraeger | b26ba22 | 2013-01-07 15:51:52 +0100 | [diff] [blame] | 302 | vcdev->curr_io |= flag; |
Cornelia Huck | 99437a2 | 2013-04-04 10:25:06 +0200 | [diff] [blame] | 303 | } |
Christian Borntraeger | b26ba22 | 2013-01-07 15:51:52 +0100 | [diff] [blame] | 304 | spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); |
| 305 | cpu_relax(); |
| 306 | } while (ret == -EBUSY); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 307 | wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); |
| 308 | return ret ? ret : vcdev->err; |
| 309 | } |
| 310 | |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 311 | static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, |
| 312 | struct ccw1 *ccw) |
| 313 | { |
| 314 | int ret; |
| 315 | unsigned long *indicatorp = NULL; |
| 316 | struct virtio_thinint_area *thinint_area = NULL; |
| 317 | struct airq_info *airq_info = vcdev->airq_info; |
| 318 | |
| 319 | if (vcdev->is_thinint) { |
| 320 | thinint_area = kzalloc(sizeof(*thinint_area), |
| 321 | GFP_DMA | GFP_KERNEL); |
| 322 | if (!thinint_area) |
| 323 | return; |
| 324 | thinint_area->summary_indicator = |
| 325 | (unsigned long) &airq_info->summary_indicator; |
| 326 | thinint_area->isc = VIRTIO_AIRQ_ISC; |
| 327 | ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; |
| 328 | ccw->count = sizeof(*thinint_area); |
| 329 | ccw->cda = (__u32)(unsigned long) thinint_area; |
| 330 | } else { |
| 331 | indicatorp = kmalloc(sizeof(&vcdev->indicators), |
| 332 | GFP_DMA | GFP_KERNEL); |
| 333 | if (!indicatorp) |
| 334 | return; |
| 335 | *indicatorp = 0; |
| 336 | ccw->cmd_code = CCW_CMD_SET_IND; |
| 337 | ccw->count = sizeof(vcdev->indicators); |
| 338 | ccw->cda = (__u32)(unsigned long) indicatorp; |
| 339 | } |
| 340 | /* Deregister indicators from host. */ |
| 341 | vcdev->indicators = 0; |
| 342 | ccw->flags = 0; |
| 343 | ret = ccw_io_helper(vcdev, ccw, |
| 344 | vcdev->is_thinint ? |
| 345 | VIRTIO_CCW_DOING_SET_IND_ADAPTER : |
| 346 | VIRTIO_CCW_DOING_SET_IND); |
| 347 | if (ret && (ret != -ENODEV)) |
| 348 | dev_info(&vcdev->cdev->dev, |
| 349 | "Failed to deregister indicators (%d)\n", ret); |
| 350 | else if (vcdev->is_thinint) |
| 351 | virtio_ccw_drop_indicators(vcdev); |
| 352 | kfree(indicatorp); |
| 353 | kfree(thinint_area); |
| 354 | } |
| 355 | |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 356 | static inline long do_kvm_notify(struct subchannel_id schid, |
Michael S. Tsirkin | 07e1693 | 2013-02-28 12:33:16 +0100 | [diff] [blame] | 357 | unsigned long queue_index, |
| 358 | long cookie) |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 359 | { |
| 360 | register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY; |
| 361 | register struct subchannel_id __schid asm("2") = schid; |
| 362 | register unsigned long __index asm("3") = queue_index; |
| 363 | register long __rc asm("2"); |
Michael S. Tsirkin | 07e1693 | 2013-02-28 12:33:16 +0100 | [diff] [blame] | 364 | register long __cookie asm("4") = cookie; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 365 | |
| 366 | asm volatile ("diag 2,4,0x500\n" |
Michael S. Tsirkin | 07e1693 | 2013-02-28 12:33:16 +0100 | [diff] [blame] | 367 | : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index), |
| 368 | "d"(__cookie) |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 369 | : "memory", "cc"); |
| 370 | return __rc; |
| 371 | } |
| 372 | |
Heinz Graalfs | 46f9c2b | 2013-10-29 09:38:50 +1030 | [diff] [blame] | 373 | static bool virtio_ccw_kvm_notify(struct virtqueue *vq) |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 374 | { |
| 375 | struct virtio_ccw_vq_info *info = vq->priv; |
| 376 | struct virtio_ccw_device *vcdev; |
| 377 | struct subchannel_id schid; |
| 378 | |
| 379 | vcdev = to_vc_device(info->vq->vdev); |
| 380 | ccw_device_get_schid(vcdev->cdev, &schid); |
Linus Torvalds | 01227a8 | 2013-05-05 14:47:31 -0700 | [diff] [blame] | 381 | info->cookie = do_kvm_notify(schid, vq->index, info->cookie); |
Heinz Graalfs | 46f9c2b | 2013-10-29 09:38:50 +1030 | [diff] [blame] | 382 | if (info->cookie < 0) |
| 383 | return false; |
| 384 | return true; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 385 | } |
| 386 | |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 387 | static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, |
| 388 | struct ccw1 *ccw, int index) |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 389 | { |
| 390 | vcdev->config_block->index = index; |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 391 | ccw->cmd_code = CCW_CMD_READ_VQ_CONF; |
| 392 | ccw->flags = 0; |
| 393 | ccw->count = sizeof(struct vq_config_block); |
| 394 | ccw->cda = (__u32)(unsigned long)(vcdev->config_block); |
| 395 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 396 | return vcdev->config_block->num; |
| 397 | } |
| 398 | |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 399 | static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 400 | { |
| 401 | struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); |
| 402 | struct virtio_ccw_vq_info *info = vq->priv; |
| 403 | unsigned long flags; |
| 404 | unsigned long size; |
| 405 | int ret; |
Rusty Russell | 9d0ca6e | 2013-03-21 14:17:34 +0000 | [diff] [blame] | 406 | unsigned int index = vq->index; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 407 | |
| 408 | /* Remove from our list. */ |
| 409 | spin_lock_irqsave(&vcdev->lock, flags); |
| 410 | list_del(&info->node); |
| 411 | spin_unlock_irqrestore(&vcdev->lock, flags); |
| 412 | |
| 413 | /* Release from host. */ |
| 414 | info->info_block->queue = 0; |
| 415 | info->info_block->align = 0; |
| 416 | info->info_block->index = index; |
| 417 | info->info_block->num = 0; |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 418 | ccw->cmd_code = CCW_CMD_SET_VQ; |
| 419 | ccw->flags = 0; |
| 420 | ccw->count = sizeof(*info->info_block); |
| 421 | ccw->cda = (__u32)(unsigned long)(info->info_block); |
| 422 | ret = ccw_io_helper(vcdev, ccw, |
| 423 | VIRTIO_CCW_DOING_SET_VQ | index); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 424 | /* |
| 425 | * -ENODEV isn't considered an error: The device is gone anyway. |
| 426 | * This may happen on device detach. |
| 427 | */ |
| 428 | if (ret && (ret != -ENODEV)) |
| 429 | dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d", |
| 430 | ret, index); |
| 431 | |
| 432 | vring_del_virtqueue(vq); |
| 433 | size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); |
| 434 | free_pages_exact(info->queue, size); |
| 435 | kfree(info->info_block); |
| 436 | kfree(info); |
| 437 | } |
| 438 | |
| 439 | static void virtio_ccw_del_vqs(struct virtio_device *vdev) |
| 440 | { |
| 441 | struct virtqueue *vq, *n; |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 442 | struct ccw1 *ccw; |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 443 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 444 | |
| 445 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); |
| 446 | if (!ccw) |
| 447 | return; |
| 448 | |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 449 | virtio_ccw_drop_indicator(vcdev, ccw); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 450 | |
| 451 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 452 | virtio_ccw_del_vq(vq, ccw); |
| 453 | |
| 454 | kfree(ccw); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 455 | } |
| 456 | |
| 457 | static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, |
| 458 | int i, vq_callback_t *callback, |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 459 | const char *name, |
| 460 | struct ccw1 *ccw) |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 461 | { |
| 462 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
| 463 | int err; |
Cornelia Huck | c98d368 | 2013-01-25 15:34:16 +0100 | [diff] [blame] | 464 | struct virtqueue *vq = NULL; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 465 | struct virtio_ccw_vq_info *info; |
Cornelia Huck | c98d368 | 2013-01-25 15:34:16 +0100 | [diff] [blame] | 466 | unsigned long size = 0; /* silence the compiler */ |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 467 | unsigned long flags; |
| 468 | |
| 469 | /* Allocate queue. */ |
| 470 | info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); |
| 471 | if (!info) { |
| 472 | dev_warn(&vcdev->cdev->dev, "no info\n"); |
| 473 | err = -ENOMEM; |
| 474 | goto out_err; |
| 475 | } |
| 476 | info->info_block = kzalloc(sizeof(*info->info_block), |
| 477 | GFP_DMA | GFP_KERNEL); |
| 478 | if (!info->info_block) { |
| 479 | dev_warn(&vcdev->cdev->dev, "no info block\n"); |
| 480 | err = -ENOMEM; |
| 481 | goto out_err; |
| 482 | } |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 483 | info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 484 | size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); |
| 485 | info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); |
| 486 | if (info->queue == NULL) { |
| 487 | dev_warn(&vcdev->cdev->dev, "no queue\n"); |
| 488 | err = -ENOMEM; |
| 489 | goto out_err; |
| 490 | } |
| 491 | |
| 492 | vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev, |
| 493 | true, info->queue, virtio_ccw_kvm_notify, |
| 494 | callback, name); |
| 495 | if (!vq) { |
| 496 | /* For now, we fail if we can't get the requested size. */ |
| 497 | dev_warn(&vcdev->cdev->dev, "no vq\n"); |
| 498 | err = -ENOMEM; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 499 | goto out_err; |
| 500 | } |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 501 | |
| 502 | /* Register it with the host. */ |
| 503 | info->info_block->queue = (__u64)info->queue; |
| 504 | info->info_block->align = KVM_VIRTIO_CCW_RING_ALIGN; |
| 505 | info->info_block->index = i; |
| 506 | info->info_block->num = info->num; |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 507 | ccw->cmd_code = CCW_CMD_SET_VQ; |
| 508 | ccw->flags = 0; |
| 509 | ccw->count = sizeof(*info->info_block); |
| 510 | ccw->cda = (__u32)(unsigned long)(info->info_block); |
| 511 | err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 512 | if (err) { |
| 513 | dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 514 | goto out_err; |
| 515 | } |
| 516 | |
Cornelia Huck | c98d368 | 2013-01-25 15:34:16 +0100 | [diff] [blame] | 517 | info->vq = vq; |
| 518 | vq->priv = info; |
| 519 | |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 520 | /* Save it to our list. */ |
| 521 | spin_lock_irqsave(&vcdev->lock, flags); |
| 522 | list_add(&info->node, &vcdev->virtqueues); |
| 523 | spin_unlock_irqrestore(&vcdev->lock, flags); |
| 524 | |
| 525 | return vq; |
| 526 | |
| 527 | out_err: |
Cornelia Huck | c98d368 | 2013-01-25 15:34:16 +0100 | [diff] [blame] | 528 | if (vq) |
| 529 | vring_del_virtqueue(vq); |
| 530 | if (info) { |
| 531 | if (info->queue) |
| 532 | free_pages_exact(info->queue, size); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 533 | kfree(info->info_block); |
Cornelia Huck | c98d368 | 2013-01-25 15:34:16 +0100 | [diff] [blame] | 534 | } |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 535 | kfree(info); |
| 536 | return ERR_PTR(err); |
| 537 | } |
| 538 | |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 539 | static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, |
| 540 | struct virtqueue *vqs[], int nvqs, |
| 541 | struct ccw1 *ccw) |
| 542 | { |
| 543 | int ret; |
| 544 | struct virtio_thinint_area *thinint_area = NULL; |
| 545 | struct airq_info *info; |
| 546 | |
| 547 | thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL); |
| 548 | if (!thinint_area) { |
| 549 | ret = -ENOMEM; |
| 550 | goto out; |
| 551 | } |
| 552 | /* Try to get an indicator. */ |
| 553 | thinint_area->indicator = get_airq_indicator(vqs, nvqs, |
| 554 | &thinint_area->bit_nr, |
| 555 | &vcdev->airq_info); |
| 556 | if (!thinint_area->indicator) { |
| 557 | ret = -ENOSPC; |
| 558 | goto out; |
| 559 | } |
| 560 | info = vcdev->airq_info; |
| 561 | thinint_area->summary_indicator = |
| 562 | (unsigned long) &info->summary_indicator; |
| 563 | thinint_area->isc = VIRTIO_AIRQ_ISC; |
| 564 | ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; |
| 565 | ccw->flags = CCW_FLAG_SLI; |
| 566 | ccw->count = sizeof(*thinint_area); |
| 567 | ccw->cda = (__u32)(unsigned long)thinint_area; |
| 568 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); |
| 569 | if (ret) { |
| 570 | if (ret == -EOPNOTSUPP) { |
| 571 | /* |
| 572 | * The host does not support adapter interrupts |
| 573 | * for virtio-ccw, stop trying. |
| 574 | */ |
| 575 | virtio_ccw_use_airq = 0; |
| 576 | pr_info("Adapter interrupts unsupported on host\n"); |
| 577 | } else |
| 578 | dev_warn(&vcdev->cdev->dev, |
| 579 | "enabling adapter interrupts = %d\n", ret); |
| 580 | virtio_ccw_drop_indicators(vcdev); |
| 581 | } |
| 582 | out: |
| 583 | kfree(thinint_area); |
| 584 | return ret; |
| 585 | } |
| 586 | |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 587 | static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, |
| 588 | struct virtqueue *vqs[], |
| 589 | vq_callback_t *callbacks[], |
| 590 | const char *names[]) |
| 591 | { |
| 592 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
| 593 | unsigned long *indicatorp = NULL; |
| 594 | int ret, i; |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 595 | struct ccw1 *ccw; |
| 596 | |
| 597 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); |
| 598 | if (!ccw) |
| 599 | return -ENOMEM; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 600 | |
| 601 | for (i = 0; i < nvqs; ++i) { |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 602 | vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i], |
| 603 | ccw); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 604 | if (IS_ERR(vqs[i])) { |
| 605 | ret = PTR_ERR(vqs[i]); |
| 606 | vqs[i] = NULL; |
| 607 | goto out; |
| 608 | } |
| 609 | } |
| 610 | ret = -ENOMEM; |
| 611 | /* We need a data area under 2G to communicate. */ |
| 612 | indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL); |
| 613 | if (!indicatorp) |
| 614 | goto out; |
| 615 | *indicatorp = (unsigned long) &vcdev->indicators; |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 616 | if (vcdev->is_thinint) { |
| 617 | ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); |
| 618 | if (ret) |
| 619 | /* no error, just fall back to legacy interrupts */ |
| 620 | vcdev->is_thinint = 0; |
| 621 | } |
| 622 | if (!vcdev->is_thinint) { |
| 623 | /* Register queue indicators with host. */ |
| 624 | vcdev->indicators = 0; |
| 625 | ccw->cmd_code = CCW_CMD_SET_IND; |
| 626 | ccw->flags = 0; |
| 627 | ccw->count = sizeof(vcdev->indicators); |
| 628 | ccw->cda = (__u32)(unsigned long) indicatorp; |
| 629 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); |
| 630 | if (ret) |
| 631 | goto out; |
| 632 | } |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 633 | /* Register indicators2 with host for config changes */ |
| 634 | *indicatorp = (unsigned long) &vcdev->indicators2; |
| 635 | vcdev->indicators2 = 0; |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 636 | ccw->cmd_code = CCW_CMD_SET_CONF_IND; |
| 637 | ccw->flags = 0; |
| 638 | ccw->count = sizeof(vcdev->indicators2); |
| 639 | ccw->cda = (__u32)(unsigned long) indicatorp; |
| 640 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 641 | if (ret) |
| 642 | goto out; |
| 643 | |
| 644 | kfree(indicatorp); |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 645 | kfree(ccw); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 646 | return 0; |
| 647 | out: |
| 648 | kfree(indicatorp); |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 649 | kfree(ccw); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 650 | virtio_ccw_del_vqs(vdev); |
| 651 | return ret; |
| 652 | } |
| 653 | |
| 654 | static void virtio_ccw_reset(struct virtio_device *vdev) |
| 655 | { |
| 656 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 657 | struct ccw1 *ccw; |
| 658 | |
| 659 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); |
| 660 | if (!ccw) |
| 661 | return; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 662 | |
| 663 | /* Zero status bits. */ |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 664 | *vcdev->status = 0; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 665 | |
| 666 | /* Send a reset ccw on device. */ |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 667 | ccw->cmd_code = CCW_CMD_VDEV_RESET; |
| 668 | ccw->flags = 0; |
| 669 | ccw->count = 0; |
| 670 | ccw->cda = 0; |
| 671 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); |
| 672 | kfree(ccw); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 673 | } |
| 674 | |
Michael S. Tsirkin | d025477 | 2014-10-07 16:39:43 +0200 | [diff] [blame] | 675 | static u64 virtio_ccw_get_features(struct virtio_device *vdev) |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 676 | { |
| 677 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 678 | struct virtio_feature_desc *features; |
Michael S. Tsirkin | 732c56e | 2014-11-27 13:54:28 +0200 | [diff] [blame] | 679 | int ret; |
| 680 | u64 rc; |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 681 | struct ccw1 *ccw; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 682 | |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 683 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); |
| 684 | if (!ccw) |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 685 | return 0; |
| 686 | |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 687 | features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); |
| 688 | if (!features) { |
| 689 | rc = 0; |
| 690 | goto out_free; |
| 691 | } |
| 692 | /* Read the feature bits from the host. */ |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 693 | features->index = 0; |
| 694 | ccw->cmd_code = CCW_CMD_READ_FEAT; |
| 695 | ccw->flags = 0; |
| 696 | ccw->count = sizeof(*features); |
| 697 | ccw->cda = (__u32)(unsigned long)features; |
| 698 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); |
| 699 | if (ret) { |
| 700 | rc = 0; |
| 701 | goto out_free; |
| 702 | } |
| 703 | |
| 704 | rc = le32_to_cpu(features->features); |
| 705 | |
Michael S. Tsirkin | 732c56e | 2014-11-27 13:54:28 +0200 | [diff] [blame] | 706 | /* Read second half of the feature bits from the host. */ |
| 707 | features->index = 1; |
| 708 | ccw->cmd_code = CCW_CMD_READ_FEAT; |
| 709 | ccw->flags = 0; |
| 710 | ccw->count = sizeof(*features); |
| 711 | ccw->cda = (__u32)(unsigned long)features; |
| 712 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); |
| 713 | if (ret == 0) |
| 714 | rc |= (u64)le32_to_cpu(features->features) << 32; |
| 715 | |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 716 | out_free: |
| 717 | kfree(features); |
| 718 | kfree(ccw); |
| 719 | return rc; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 720 | } |
| 721 | |
| 722 | static void virtio_ccw_finalize_features(struct virtio_device *vdev) |
| 723 | { |
| 724 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 725 | struct virtio_feature_desc *features; |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 726 | struct ccw1 *ccw; |
| 727 | |
| 728 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); |
| 729 | if (!ccw) |
| 730 | return; |
| 731 | |
| 732 | features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); |
| 733 | if (!features) |
| 734 | goto out_free; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 735 | |
| 736 | /* Give virtio_ring a chance to accept features. */ |
| 737 | vring_transport_features(vdev); |
| 738 | |
Michael S. Tsirkin | e16e12b | 2014-10-07 16:39:42 +0200 | [diff] [blame] | 739 | features->index = 0; |
Michael S. Tsirkin | 732c56e | 2014-11-27 13:54:28 +0200 | [diff] [blame] | 740 | features->features = cpu_to_le32((u32)vdev->features); |
| 741 | /* Write the first half of the feature bits to the host. */ |
| 742 | ccw->cmd_code = CCW_CMD_WRITE_FEAT; |
| 743 | ccw->flags = 0; |
| 744 | ccw->count = sizeof(*features); |
| 745 | ccw->cda = (__u32)(unsigned long)features; |
| 746 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); |
| 747 | |
| 748 | features->index = 1; |
| 749 | features->features = cpu_to_le32(vdev->features >> 32); |
| 750 | /* Write the second half of the feature bits to the host. */ |
Michael S. Tsirkin | e16e12b | 2014-10-07 16:39:42 +0200 | [diff] [blame] | 751 | ccw->cmd_code = CCW_CMD_WRITE_FEAT; |
| 752 | ccw->flags = 0; |
| 753 | ccw->count = sizeof(*features); |
| 754 | ccw->cda = (__u32)(unsigned long)features; |
| 755 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); |
| 756 | |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 757 | out_free: |
| 758 | kfree(features); |
| 759 | kfree(ccw); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 760 | } |
| 761 | |
| 762 | static void virtio_ccw_get_config(struct virtio_device *vdev, |
| 763 | unsigned int offset, void *buf, unsigned len) |
| 764 | { |
| 765 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
| 766 | int ret; |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 767 | struct ccw1 *ccw; |
| 768 | void *config_area; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 769 | |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 770 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); |
| 771 | if (!ccw) |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 772 | return; |
| 773 | |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 774 | config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); |
| 775 | if (!config_area) |
| 776 | goto out_free; |
| 777 | |
| 778 | /* Read the config area from the host. */ |
| 779 | ccw->cmd_code = CCW_CMD_READ_CONF; |
| 780 | ccw->flags = 0; |
| 781 | ccw->count = offset + len; |
| 782 | ccw->cda = (__u32)(unsigned long)config_area; |
| 783 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); |
| 784 | if (ret) |
| 785 | goto out_free; |
| 786 | |
| 787 | memcpy(vcdev->config, config_area, sizeof(vcdev->config)); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 788 | memcpy(buf, &vcdev->config[offset], len); |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 789 | |
| 790 | out_free: |
| 791 | kfree(config_area); |
| 792 | kfree(ccw); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 793 | } |
| 794 | |
| 795 | static void virtio_ccw_set_config(struct virtio_device *vdev, |
| 796 | unsigned int offset, const void *buf, |
| 797 | unsigned len) |
| 798 | { |
| 799 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 800 | struct ccw1 *ccw; |
| 801 | void *config_area; |
| 802 | |
| 803 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); |
| 804 | if (!ccw) |
| 805 | return; |
| 806 | |
| 807 | config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); |
| 808 | if (!config_area) |
| 809 | goto out_free; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 810 | |
| 811 | memcpy(&vcdev->config[offset], buf, len); |
| 812 | /* Write the config area to the host. */ |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 813 | memcpy(config_area, vcdev->config, sizeof(vcdev->config)); |
| 814 | ccw->cmd_code = CCW_CMD_WRITE_CONF; |
| 815 | ccw->flags = 0; |
| 816 | ccw->count = offset + len; |
| 817 | ccw->cda = (__u32)(unsigned long)config_area; |
| 818 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); |
| 819 | |
| 820 | out_free: |
| 821 | kfree(config_area); |
| 822 | kfree(ccw); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 823 | } |
| 824 | |
| 825 | static u8 virtio_ccw_get_status(struct virtio_device *vdev) |
| 826 | { |
| 827 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
| 828 | |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 829 | return *vcdev->status; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 830 | } |
| 831 | |
| 832 | static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) |
| 833 | { |
| 834 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 835 | struct ccw1 *ccw; |
| 836 | |
| 837 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); |
| 838 | if (!ccw) |
| 839 | return; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 840 | |
| 841 | /* Write the status to the host. */ |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 842 | *vcdev->status = status; |
| 843 | ccw->cmd_code = CCW_CMD_WRITE_STATUS; |
| 844 | ccw->flags = 0; |
| 845 | ccw->count = sizeof(status); |
| 846 | ccw->cda = (__u32)(unsigned long)vcdev->status; |
| 847 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); |
| 848 | kfree(ccw); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 849 | } |
| 850 | |
| 851 | static struct virtio_config_ops virtio_ccw_config_ops = { |
| 852 | .get_features = virtio_ccw_get_features, |
| 853 | .finalize_features = virtio_ccw_finalize_features, |
| 854 | .get = virtio_ccw_get_config, |
| 855 | .set = virtio_ccw_set_config, |
| 856 | .get_status = virtio_ccw_get_status, |
| 857 | .set_status = virtio_ccw_set_status, |
| 858 | .reset = virtio_ccw_reset, |
| 859 | .find_vqs = virtio_ccw_find_vqs, |
| 860 | .del_vqs = virtio_ccw_del_vqs, |
| 861 | }; |
| 862 | |
| 863 | |
| 864 | /* |
| 865 | * ccw bus driver related functions |
| 866 | */ |
| 867 | |
| 868 | static void virtio_ccw_release_dev(struct device *_d) |
| 869 | { |
| 870 | struct virtio_device *dev = container_of(_d, struct virtio_device, |
| 871 | dev); |
| 872 | struct virtio_ccw_device *vcdev = to_vc_device(dev); |
| 873 | |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 874 | kfree(vcdev->status); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 875 | kfree(vcdev->config_block); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 876 | kfree(vcdev); |
| 877 | } |
| 878 | |
| 879 | static int irb_is_error(struct irb *irb) |
| 880 | { |
| 881 | if (scsw_cstat(&irb->scsw) != 0) |
| 882 | return 1; |
| 883 | if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) |
| 884 | return 1; |
| 885 | if (scsw_cc(&irb->scsw) != 0) |
| 886 | return 1; |
| 887 | return 0; |
| 888 | } |
| 889 | |
| 890 | static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, |
| 891 | int index) |
| 892 | { |
| 893 | struct virtio_ccw_vq_info *info; |
| 894 | unsigned long flags; |
| 895 | struct virtqueue *vq; |
| 896 | |
| 897 | vq = NULL; |
| 898 | spin_lock_irqsave(&vcdev->lock, flags); |
| 899 | list_for_each_entry(info, &vcdev->virtqueues, node) { |
Rusty Russell | 9d0ca6e | 2013-03-21 14:17:34 +0000 | [diff] [blame] | 900 | if (info->vq->index == index) { |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 901 | vq = info->vq; |
| 902 | break; |
| 903 | } |
| 904 | } |
| 905 | spin_unlock_irqrestore(&vcdev->lock, flags); |
| 906 | return vq; |
| 907 | } |
| 908 | |
| 909 | static void virtio_ccw_int_handler(struct ccw_device *cdev, |
| 910 | unsigned long intparm, |
| 911 | struct irb *irb) |
| 912 | { |
| 913 | __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; |
| 914 | struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); |
| 915 | int i; |
| 916 | struct virtqueue *vq; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 917 | |
Heinz Graalfs | 2e02104 | 2014-02-27 14:34:35 +0100 | [diff] [blame] | 918 | if (!vcdev) |
| 919 | return; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 920 | /* Check if it's a notification from the host. */ |
| 921 | if ((intparm == 0) && |
| 922 | (scsw_stctl(&irb->scsw) == |
| 923 | (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { |
| 924 | /* OK */ |
| 925 | } |
Cornelia Huck | 19e4735 | 2013-06-04 11:04:47 +0200 | [diff] [blame] | 926 | if (irb_is_error(irb)) { |
| 927 | /* Command reject? */ |
| 928 | if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && |
| 929 | (irb->ecw[0] & SNS0_CMD_REJECT)) |
| 930 | vcdev->err = -EOPNOTSUPP; |
| 931 | else |
| 932 | /* Map everything else to -EIO. */ |
| 933 | vcdev->err = -EIO; |
| 934 | } |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 935 | if (vcdev->curr_io & activity) { |
| 936 | switch (activity) { |
| 937 | case VIRTIO_CCW_DOING_READ_FEAT: |
| 938 | case VIRTIO_CCW_DOING_WRITE_FEAT: |
| 939 | case VIRTIO_CCW_DOING_READ_CONFIG: |
| 940 | case VIRTIO_CCW_DOING_WRITE_CONFIG: |
| 941 | case VIRTIO_CCW_DOING_WRITE_STATUS: |
| 942 | case VIRTIO_CCW_DOING_SET_VQ: |
| 943 | case VIRTIO_CCW_DOING_SET_IND: |
| 944 | case VIRTIO_CCW_DOING_SET_CONF_IND: |
| 945 | case VIRTIO_CCW_DOING_RESET: |
| 946 | case VIRTIO_CCW_DOING_READ_VQ_CONF: |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 947 | case VIRTIO_CCW_DOING_SET_IND_ADAPTER: |
Thomas Huth | 6bb2c83 | 2014-10-07 16:39:50 +0200 | [diff] [blame^] | 948 | case VIRTIO_CCW_DOING_SET_VIRTIO_REV: |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 949 | vcdev->curr_io &= ~activity; |
| 950 | wake_up(&vcdev->wait_q); |
| 951 | break; |
| 952 | default: |
| 953 | /* don't know what to do... */ |
| 954 | dev_warn(&cdev->dev, "Suspicious activity '%08x'\n", |
| 955 | activity); |
| 956 | WARN_ON(1); |
| 957 | break; |
| 958 | } |
| 959 | } |
| 960 | for_each_set_bit(i, &vcdev->indicators, |
| 961 | sizeof(vcdev->indicators) * BITS_PER_BYTE) { |
| 962 | /* The bit clear must happen before the vring kick. */ |
| 963 | clear_bit(i, &vcdev->indicators); |
| 964 | barrier(); |
| 965 | vq = virtio_ccw_vq_by_ind(vcdev, i); |
| 966 | vring_interrupt(0, vq); |
| 967 | } |
| 968 | if (test_bit(0, &vcdev->indicators2)) { |
Michael S. Tsirkin | 016c98c | 2014-10-14 10:40:34 +1030 | [diff] [blame] | 969 | virtio_config_changed(&vcdev->vdev); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 970 | clear_bit(0, &vcdev->indicators2); |
| 971 | } |
| 972 | } |
| 973 | |
| 974 | /* |
| 975 | * We usually want to autoonline all devices, but give the admin |
| 976 | * a way to exempt devices from this. |
| 977 | */ |
| 978 | #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ |
| 979 | (8*sizeof(long))) |
| 980 | static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; |
| 981 | |
| 982 | static char *no_auto = ""; |
| 983 | |
| 984 | module_param(no_auto, charp, 0444); |
| 985 | MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); |
| 986 | |
| 987 | static int virtio_ccw_check_autoonline(struct ccw_device *cdev) |
| 988 | { |
| 989 | struct ccw_dev_id id; |
| 990 | |
| 991 | ccw_device_get_id(cdev, &id); |
| 992 | if (test_bit(id.devno, devs_no_auto[id.ssid])) |
| 993 | return 0; |
| 994 | return 1; |
| 995 | } |
| 996 | |
| 997 | static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) |
| 998 | { |
| 999 | struct ccw_device *cdev = data; |
| 1000 | int ret; |
| 1001 | |
| 1002 | ret = ccw_device_set_online(cdev); |
| 1003 | if (ret) |
| 1004 | dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); |
| 1005 | } |
| 1006 | |
| 1007 | static int virtio_ccw_probe(struct ccw_device *cdev) |
| 1008 | { |
| 1009 | cdev->handler = virtio_ccw_int_handler; |
| 1010 | |
| 1011 | if (virtio_ccw_check_autoonline(cdev)) |
| 1012 | async_schedule(virtio_ccw_auto_online, cdev); |
| 1013 | return 0; |
| 1014 | } |
| 1015 | |
Heinz Graalfs | 2e02104 | 2014-02-27 14:34:35 +0100 | [diff] [blame] | 1016 | static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) |
| 1017 | { |
| 1018 | unsigned long flags; |
| 1019 | struct virtio_ccw_device *vcdev; |
| 1020 | |
| 1021 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
| 1022 | vcdev = dev_get_drvdata(&cdev->dev); |
Heinz Graalfs | 79629b2 | 2014-03-05 15:23:54 +0100 | [diff] [blame] | 1023 | if (!vcdev || vcdev->going_away) { |
Heinz Graalfs | 2e02104 | 2014-02-27 14:34:35 +0100 | [diff] [blame] | 1024 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| 1025 | return NULL; |
| 1026 | } |
Heinz Graalfs | 79629b2 | 2014-03-05 15:23:54 +0100 | [diff] [blame] | 1027 | vcdev->going_away = true; |
Heinz Graalfs | 2e02104 | 2014-02-27 14:34:35 +0100 | [diff] [blame] | 1028 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| 1029 | return vcdev; |
| 1030 | } |
| 1031 | |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1032 | static void virtio_ccw_remove(struct ccw_device *cdev) |
| 1033 | { |
Heinz Graalfs | 79629b2 | 2014-03-05 15:23:54 +0100 | [diff] [blame] | 1034 | unsigned long flags; |
Heinz Graalfs | 2e02104 | 2014-02-27 14:34:35 +0100 | [diff] [blame] | 1035 | struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1036 | |
Heinz Graalfs | e75279c | 2014-04-28 11:24:05 +0930 | [diff] [blame] | 1037 | if (vcdev && cdev->online) { |
| 1038 | if (vcdev->device_lost) |
| 1039 | virtio_break_device(&vcdev->vdev); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1040 | unregister_virtio_device(&vcdev->vdev); |
Heinz Graalfs | e75279c | 2014-04-28 11:24:05 +0930 | [diff] [blame] | 1041 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
| 1042 | dev_set_drvdata(&cdev->dev, NULL); |
| 1043 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| 1044 | } |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1045 | cdev->handler = NULL; |
| 1046 | } |
| 1047 | |
| 1048 | static int virtio_ccw_offline(struct ccw_device *cdev) |
| 1049 | { |
Heinz Graalfs | 79629b2 | 2014-03-05 15:23:54 +0100 | [diff] [blame] | 1050 | unsigned long flags; |
Heinz Graalfs | 2e02104 | 2014-02-27 14:34:35 +0100 | [diff] [blame] | 1051 | struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1052 | |
Heinz Graalfs | e75279c | 2014-04-28 11:24:05 +0930 | [diff] [blame] | 1053 | if (!vcdev) |
| 1054 | return 0; |
| 1055 | if (vcdev->device_lost) |
| 1056 | virtio_break_device(&vcdev->vdev); |
| 1057 | unregister_virtio_device(&vcdev->vdev); |
| 1058 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
| 1059 | dev_set_drvdata(&cdev->dev, NULL); |
| 1060 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1061 | return 0; |
| 1062 | } |
| 1063 | |
Thomas Huth | 6bb2c83 | 2014-10-07 16:39:50 +0200 | [diff] [blame^] | 1064 | static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) |
| 1065 | { |
| 1066 | struct virtio_rev_info *rev; |
| 1067 | struct ccw1 *ccw; |
| 1068 | int ret; |
| 1069 | |
| 1070 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); |
| 1071 | if (!ccw) |
| 1072 | return -ENOMEM; |
| 1073 | rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL); |
| 1074 | if (!rev) { |
| 1075 | kfree(ccw); |
| 1076 | return -ENOMEM; |
| 1077 | } |
| 1078 | |
| 1079 | /* Set transport revision */ |
| 1080 | ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; |
| 1081 | ccw->flags = 0; |
| 1082 | ccw->count = sizeof(*rev); |
| 1083 | ccw->cda = (__u32)(unsigned long)rev; |
| 1084 | |
| 1085 | vcdev->revision = VIRTIO_CCW_REV_MAX; |
| 1086 | do { |
| 1087 | rev->revision = vcdev->revision; |
| 1088 | /* none of our supported revisions carry payload */ |
| 1089 | rev->length = 0; |
| 1090 | ret = ccw_io_helper(vcdev, ccw, |
| 1091 | VIRTIO_CCW_DOING_SET_VIRTIO_REV); |
| 1092 | if (ret == -EOPNOTSUPP) { |
| 1093 | if (vcdev->revision == 0) |
| 1094 | /* |
| 1095 | * The host device does not support setting |
| 1096 | * the revision: let's operate it in legacy |
| 1097 | * mode. |
| 1098 | */ |
| 1099 | ret = 0; |
| 1100 | else |
| 1101 | vcdev->revision--; |
| 1102 | } |
| 1103 | } while (ret == -EOPNOTSUPP); |
| 1104 | |
| 1105 | kfree(ccw); |
| 1106 | kfree(rev); |
| 1107 | return ret; |
| 1108 | } |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1109 | |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1110 | static int virtio_ccw_online(struct ccw_device *cdev) |
| 1111 | { |
| 1112 | int ret; |
| 1113 | struct virtio_ccw_device *vcdev; |
Heinz Graalfs | 2e02104 | 2014-02-27 14:34:35 +0100 | [diff] [blame] | 1114 | unsigned long flags; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1115 | |
| 1116 | vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); |
| 1117 | if (!vcdev) { |
| 1118 | dev_warn(&cdev->dev, "Could not get memory for virtio\n"); |
| 1119 | ret = -ENOMEM; |
| 1120 | goto out_free; |
| 1121 | } |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1122 | vcdev->config_block = kzalloc(sizeof(*vcdev->config_block), |
| 1123 | GFP_DMA | GFP_KERNEL); |
| 1124 | if (!vcdev->config_block) { |
| 1125 | ret = -ENOMEM; |
| 1126 | goto out_free; |
| 1127 | } |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 1128 | vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL); |
| 1129 | if (!vcdev->status) { |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1130 | ret = -ENOMEM; |
| 1131 | goto out_free; |
| 1132 | } |
| 1133 | |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 1134 | vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ |
| 1135 | |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1136 | vcdev->vdev.dev.parent = &cdev->dev; |
| 1137 | vcdev->vdev.dev.release = virtio_ccw_release_dev; |
| 1138 | vcdev->vdev.config = &virtio_ccw_config_ops; |
| 1139 | vcdev->cdev = cdev; |
| 1140 | init_waitqueue_head(&vcdev->wait_q); |
| 1141 | INIT_LIST_HEAD(&vcdev->virtqueues); |
| 1142 | spin_lock_init(&vcdev->lock); |
| 1143 | |
Heinz Graalfs | 2e02104 | 2014-02-27 14:34:35 +0100 | [diff] [blame] | 1144 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1145 | dev_set_drvdata(&cdev->dev, vcdev); |
Heinz Graalfs | 2e02104 | 2014-02-27 14:34:35 +0100 | [diff] [blame] | 1146 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1147 | vcdev->vdev.id.vendor = cdev->id.cu_type; |
| 1148 | vcdev->vdev.id.device = cdev->id.cu_model; |
Thomas Huth | 6bb2c83 | 2014-10-07 16:39:50 +0200 | [diff] [blame^] | 1149 | |
| 1150 | ret = virtio_ccw_set_transport_rev(vcdev); |
| 1151 | if (ret) |
| 1152 | goto out_free; |
| 1153 | |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1154 | ret = register_virtio_device(&vcdev->vdev); |
| 1155 | if (ret) { |
| 1156 | dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", |
| 1157 | ret); |
| 1158 | goto out_put; |
| 1159 | } |
| 1160 | return 0; |
| 1161 | out_put: |
Heinz Graalfs | 2e02104 | 2014-02-27 14:34:35 +0100 | [diff] [blame] | 1162 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1163 | dev_set_drvdata(&cdev->dev, NULL); |
Heinz Graalfs | 2e02104 | 2014-02-27 14:34:35 +0100 | [diff] [blame] | 1164 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1165 | put_device(&vcdev->vdev.dev); |
| 1166 | return ret; |
| 1167 | out_free: |
| 1168 | if (vcdev) { |
Cornelia Huck | 73fa21e | 2013-01-07 15:51:51 +0100 | [diff] [blame] | 1169 | kfree(vcdev->status); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1170 | kfree(vcdev->config_block); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1171 | } |
| 1172 | kfree(vcdev); |
| 1173 | return ret; |
| 1174 | } |
| 1175 | |
| 1176 | static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) |
| 1177 | { |
Heinz Graalfs | e75279c | 2014-04-28 11:24:05 +0930 | [diff] [blame] | 1178 | int rc; |
| 1179 | struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); |
| 1180 | |
| 1181 | /* |
| 1182 | * Make sure vcdev is set |
| 1183 | * i.e. set_offline/remove callback not already running |
| 1184 | */ |
| 1185 | if (!vcdev) |
| 1186 | return NOTIFY_DONE; |
| 1187 | |
| 1188 | switch (event) { |
| 1189 | case CIO_GONE: |
| 1190 | vcdev->device_lost = true; |
| 1191 | rc = NOTIFY_DONE; |
| 1192 | break; |
| 1193 | default: |
| 1194 | rc = NOTIFY_DONE; |
| 1195 | break; |
| 1196 | } |
| 1197 | return rc; |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1198 | } |
| 1199 | |
| 1200 | static struct ccw_device_id virtio_ids[] = { |
| 1201 | { CCW_DEVICE(0x3832, 0) }, |
| 1202 | {}, |
| 1203 | }; |
| 1204 | MODULE_DEVICE_TABLE(ccw, virtio_ids); |
| 1205 | |
| 1206 | static struct ccw_driver virtio_ccw_driver = { |
| 1207 | .driver = { |
| 1208 | .owner = THIS_MODULE, |
| 1209 | .name = "virtio_ccw", |
| 1210 | }, |
| 1211 | .ids = virtio_ids, |
| 1212 | .probe = virtio_ccw_probe, |
| 1213 | .remove = virtio_ccw_remove, |
| 1214 | .set_offline = virtio_ccw_offline, |
| 1215 | .set_online = virtio_ccw_online, |
| 1216 | .notify = virtio_ccw_cio_notify, |
Linus Torvalds | 89f8833 | 2013-02-24 13:07:18 -0800 | [diff] [blame] | 1217 | .int_class = IRQIO_VIR, |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1218 | }; |
| 1219 | |
| 1220 | static int __init pure_hex(char **cp, unsigned int *val, int min_digit, |
| 1221 | int max_digit, int max_val) |
| 1222 | { |
| 1223 | int diff; |
| 1224 | |
| 1225 | diff = 0; |
| 1226 | *val = 0; |
| 1227 | |
| 1228 | while (diff <= max_digit) { |
| 1229 | int value = hex_to_bin(**cp); |
| 1230 | |
| 1231 | if (value < 0) |
| 1232 | break; |
| 1233 | *val = *val * 16 + value; |
| 1234 | (*cp)++; |
| 1235 | diff++; |
| 1236 | } |
| 1237 | |
| 1238 | if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) |
| 1239 | return 1; |
| 1240 | |
| 1241 | return 0; |
| 1242 | } |
| 1243 | |
| 1244 | static int __init parse_busid(char *str, unsigned int *cssid, |
| 1245 | unsigned int *ssid, unsigned int *devno) |
| 1246 | { |
| 1247 | char *str_work; |
| 1248 | int rc, ret; |
| 1249 | |
| 1250 | rc = 1; |
| 1251 | |
| 1252 | if (*str == '\0') |
| 1253 | goto out; |
| 1254 | |
| 1255 | str_work = str; |
| 1256 | ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); |
| 1257 | if (ret || (str_work[0] != '.')) |
| 1258 | goto out; |
| 1259 | str_work++; |
| 1260 | ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); |
| 1261 | if (ret || (str_work[0] != '.')) |
| 1262 | goto out; |
| 1263 | str_work++; |
| 1264 | ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); |
| 1265 | if (ret || (str_work[0] != '\0')) |
| 1266 | goto out; |
| 1267 | |
| 1268 | rc = 0; |
| 1269 | out: |
| 1270 | return rc; |
| 1271 | } |
| 1272 | |
| 1273 | static void __init no_auto_parse(void) |
| 1274 | { |
| 1275 | unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; |
| 1276 | char *parm, *str; |
| 1277 | int rc; |
| 1278 | |
| 1279 | str = no_auto; |
| 1280 | while ((parm = strsep(&str, ","))) { |
| 1281 | rc = parse_busid(strsep(&parm, "-"), &from_cssid, |
| 1282 | &from_ssid, &from); |
| 1283 | if (rc) |
| 1284 | continue; |
| 1285 | if (parm != NULL) { |
| 1286 | rc = parse_busid(parm, &to_cssid, |
| 1287 | &to_ssid, &to); |
| 1288 | if ((from_ssid > to_ssid) || |
| 1289 | ((from_ssid == to_ssid) && (from > to))) |
| 1290 | rc = -EINVAL; |
| 1291 | } else { |
| 1292 | to_cssid = from_cssid; |
| 1293 | to_ssid = from_ssid; |
| 1294 | to = from; |
| 1295 | } |
| 1296 | if (rc) |
| 1297 | continue; |
| 1298 | while ((from_ssid < to_ssid) || |
| 1299 | ((from_ssid == to_ssid) && (from <= to))) { |
| 1300 | set_bit(from, devs_no_auto[from_ssid]); |
| 1301 | from++; |
| 1302 | if (from > __MAX_SUBCHANNEL) { |
| 1303 | from_ssid++; |
| 1304 | from = 0; |
| 1305 | } |
| 1306 | } |
| 1307 | } |
| 1308 | } |
| 1309 | |
| 1310 | static int __init virtio_ccw_init(void) |
| 1311 | { |
| 1312 | /* parse no_auto string before we do anything further */ |
| 1313 | no_auto_parse(); |
| 1314 | return ccw_driver_register(&virtio_ccw_driver); |
| 1315 | } |
| 1316 | module_init(virtio_ccw_init); |
| 1317 | |
| 1318 | static void __exit virtio_ccw_exit(void) |
| 1319 | { |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 1320 | int i; |
| 1321 | |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1322 | ccw_driver_unregister(&virtio_ccw_driver); |
Cornelia Huck | 96b1453 | 2013-02-06 10:23:39 +0100 | [diff] [blame] | 1323 | for (i = 0; i < MAX_AIRQ_AREAS; i++) |
| 1324 | destroy_airq_info(airq_areas[i]); |
Cornelia Huck | 7e64e05 | 2012-12-14 17:02:18 +0100 | [diff] [blame] | 1325 | } |
| 1326 | module_exit(virtio_ccw_exit); |