Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 IBM Corp. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/spinlock.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/export.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/bitmap.h> |
| 15 | #include <linux/sched.h> |
| 16 | #include <linux/poll.h> |
| 17 | #include <linux/pid.h> |
| 18 | #include <linux/fs.h> |
| 19 | #include <linux/mm.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <asm/cputable.h> |
| 22 | #include <asm/current.h> |
| 23 | #include <asm/copro.h> |
| 24 | |
| 25 | #include "cxl.h" |
Ian Munsie | 9bcf28c | 2015-01-09 20:34:36 +1100 | [diff] [blame] | 26 | #include "trace.h" |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 27 | |
| 28 | #define CXL_NUM_MINORS 256 /* Total to reserve */ |
| 29 | #define CXL_DEV_MINORS 13 /* 1 control + 4 AFUs * 3 (dedicated/master/shared) */ |
| 30 | |
| 31 | #define CXL_CARD_MINOR(adapter) (adapter->adapter_num * CXL_DEV_MINORS) |
| 32 | #define CXL_AFU_MINOR_D(afu) (CXL_CARD_MINOR(afu->adapter) + 1 + (3 * afu->slice)) |
| 33 | #define CXL_AFU_MINOR_M(afu) (CXL_AFU_MINOR_D(afu) + 1) |
| 34 | #define CXL_AFU_MINOR_S(afu) (CXL_AFU_MINOR_D(afu) + 2) |
| 35 | #define CXL_AFU_MKDEV_D(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_D(afu)) |
| 36 | #define CXL_AFU_MKDEV_M(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_M(afu)) |
| 37 | #define CXL_AFU_MKDEV_S(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_S(afu)) |
| 38 | |
| 39 | #define CXL_DEVT_ADAPTER(dev) (MINOR(dev) / CXL_DEV_MINORS) |
| 40 | #define CXL_DEVT_AFU(dev) ((MINOR(dev) % CXL_DEV_MINORS - 1) / 3) |
| 41 | |
| 42 | #define CXL_DEVT_IS_CARD(dev) (MINOR(dev) % CXL_DEV_MINORS == 0) |
| 43 | |
| 44 | static dev_t cxl_dev; |
| 45 | |
| 46 | static struct class *cxl_class; |
| 47 | |
| 48 | static int __afu_open(struct inode *inode, struct file *file, bool master) |
| 49 | { |
| 50 | struct cxl *adapter; |
| 51 | struct cxl_afu *afu; |
| 52 | struct cxl_context *ctx; |
| 53 | int adapter_num = CXL_DEVT_ADAPTER(inode->i_rdev); |
| 54 | int slice = CXL_DEVT_AFU(inode->i_rdev); |
| 55 | int rc = -ENODEV; |
| 56 | |
| 57 | pr_devel("afu_open afu%i.%i\n", slice, adapter_num); |
| 58 | |
| 59 | if (!(adapter = get_cxl_adapter(adapter_num))) |
| 60 | return -ENODEV; |
| 61 | |
| 62 | if (slice > adapter->slices) |
| 63 | goto err_put_adapter; |
| 64 | |
| 65 | spin_lock(&adapter->afu_list_lock); |
| 66 | if (!(afu = adapter->afu[slice])) { |
| 67 | spin_unlock(&adapter->afu_list_lock); |
| 68 | goto err_put_adapter; |
| 69 | } |
Vaibhav Jain | 1b5df59 | 2015-11-16 09:33:45 +0530 | [diff] [blame] | 70 | |
| 71 | /* |
| 72 | * taking a ref to the afu so that it doesn't go away |
| 73 | * for rest of the function. This ref is released before |
| 74 | * we return. |
| 75 | */ |
| 76 | cxl_afu_get(afu); |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 77 | spin_unlock(&adapter->afu_list_lock); |
| 78 | |
| 79 | if (!afu->current_mode) |
| 80 | goto err_put_afu; |
| 81 | |
Daniel Axtens | 0b3f9c7 | 2015-08-14 17:41:18 +1000 | [diff] [blame] | 82 | if (!cxl_adapter_link_ok(adapter)) { |
| 83 | rc = -EIO; |
| 84 | goto err_put_afu; |
| 85 | } |
| 86 | |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 87 | if (!(ctx = cxl_context_alloc())) { |
| 88 | rc = -ENOMEM; |
| 89 | goto err_put_afu; |
| 90 | } |
| 91 | |
Ian Munsie | b123429 | 2014-12-08 19:18:01 +1100 | [diff] [blame] | 92 | if ((rc = cxl_context_init(ctx, afu, master, inode->i_mapping))) |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 93 | goto err_put_afu; |
| 94 | |
| 95 | pr_devel("afu_open pe: %i\n", ctx->pe); |
| 96 | file->private_data = ctx; |
| 97 | cxl_ctx_get(); |
| 98 | |
Vaibhav Jain | 1b5df59 | 2015-11-16 09:33:45 +0530 | [diff] [blame] | 99 | /* indicate success */ |
| 100 | rc = 0; |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 101 | |
| 102 | err_put_afu: |
Vaibhav Jain | 1b5df59 | 2015-11-16 09:33:45 +0530 | [diff] [blame] | 103 | /* release the ref taken earlier */ |
| 104 | cxl_afu_put(afu); |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 105 | err_put_adapter: |
| 106 | put_device(&adapter->dev); |
| 107 | return rc; |
| 108 | } |
Michael Neuling | 0520336 | 2015-05-27 16:07:17 +1000 | [diff] [blame] | 109 | |
| 110 | int afu_open(struct inode *inode, struct file *file) |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 111 | { |
| 112 | return __afu_open(inode, file, false); |
| 113 | } |
| 114 | |
| 115 | static int afu_master_open(struct inode *inode, struct file *file) |
| 116 | { |
| 117 | return __afu_open(inode, file, true); |
| 118 | } |
| 119 | |
Michael Neuling | 0520336 | 2015-05-27 16:07:17 +1000 | [diff] [blame] | 120 | int afu_release(struct inode *inode, struct file *file) |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 121 | { |
| 122 | struct cxl_context *ctx = file->private_data; |
| 123 | |
| 124 | pr_devel("%s: closing cxl file descriptor. pe: %i\n", |
| 125 | __func__, ctx->pe); |
| 126 | cxl_context_detach(ctx); |
| 127 | |
Andrew Donnellan | 5f81b95 | 2015-09-30 11:58:07 +1000 | [diff] [blame] | 128 | |
| 129 | /* |
| 130 | * Delete the context's mapping pointer, unless it's created by the |
| 131 | * kernel API, in which case leave it so it can be freed by reclaim_ctx() |
| 132 | */ |
| 133 | if (!ctx->kernelapi) { |
| 134 | mutex_lock(&ctx->mapping_lock); |
| 135 | ctx->mapping = NULL; |
| 136 | mutex_unlock(&ctx->mapping_lock); |
| 137 | } |
Ian Munsie | b123429 | 2014-12-08 19:18:01 +1100 | [diff] [blame] | 138 | |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 139 | /* |
| 140 | * At this this point all bottom halfs have finished and we should be |
| 141 | * getting no more IRQs from the hardware for this context. Once it's |
| 142 | * removed from the IDR (and RCU synchronised) it's safe to free the |
| 143 | * sstp and context. |
| 144 | */ |
| 145 | cxl_context_free(ctx); |
| 146 | |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | static long afu_ioctl_start_work(struct cxl_context *ctx, |
| 151 | struct cxl_ioctl_start_work __user *uwork) |
| 152 | { |
| 153 | struct cxl_ioctl_start_work work; |
| 154 | u64 amr = 0; |
| 155 | int rc; |
| 156 | |
| 157 | pr_devel("%s: pe: %i\n", __func__, ctx->pe); |
| 158 | |
Ian Munsie | 0712dc7 | 2015-01-07 16:33:04 +1100 | [diff] [blame] | 159 | /* Do this outside the status_mutex to avoid a circular dependency with |
| 160 | * the locking in cxl_mmap_fault() */ |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 161 | if (copy_from_user(&work, uwork, |
| 162 | sizeof(struct cxl_ioctl_start_work))) { |
| 163 | rc = -EFAULT; |
| 164 | goto out; |
| 165 | } |
| 166 | |
Ian Munsie | 0712dc7 | 2015-01-07 16:33:04 +1100 | [diff] [blame] | 167 | mutex_lock(&ctx->status_mutex); |
| 168 | if (ctx->status != OPENED) { |
| 169 | rc = -EIO; |
| 170 | goto out; |
| 171 | } |
| 172 | |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 173 | /* |
| 174 | * if any of the reserved fields are set or any of the unused |
| 175 | * flags are set it's invalid |
| 176 | */ |
| 177 | if (work.reserved1 || work.reserved2 || work.reserved3 || |
| 178 | work.reserved4 || work.reserved5 || work.reserved6 || |
| 179 | (work.flags & ~CXL_START_WORK_ALL)) { |
| 180 | rc = -EINVAL; |
| 181 | goto out; |
| 182 | } |
| 183 | |
| 184 | if (!(work.flags & CXL_START_WORK_NUM_IRQS)) |
| 185 | work.num_interrupts = ctx->afu->pp_irqs; |
| 186 | else if ((work.num_interrupts < ctx->afu->pp_irqs) || |
| 187 | (work.num_interrupts > ctx->afu->irqs_max)) { |
| 188 | rc = -EINVAL; |
| 189 | goto out; |
| 190 | } |
| 191 | if ((rc = afu_register_irqs(ctx, work.num_interrupts))) |
| 192 | goto out; |
| 193 | |
| 194 | if (work.flags & CXL_START_WORK_AMR) |
| 195 | amr = work.amr & mfspr(SPRN_UAMOR); |
| 196 | |
Ian Munsie | d9232a3 | 2015-07-23 16:43:56 +1000 | [diff] [blame] | 197 | ctx->mmio_err_ff = !!(work.flags & CXL_START_WORK_ERR_FF); |
| 198 | |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 199 | /* |
| 200 | * We grab the PID here and not in the file open to allow for the case |
| 201 | * where a process (master, some daemon, etc) has opened the chardev on |
| 202 | * behalf of another process, so the AFU's mm gets bound to the process |
| 203 | * that performs this ioctl and not the process that opened the file. |
Vaibhav Jain | 7b8ad49 | 2015-11-24 16:26:18 +0530 | [diff] [blame] | 204 | * Also we grab the PID of the group leader so that if the task that |
| 205 | * has performed the attach operation exits the mm context of the |
| 206 | * process is still accessible. |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 207 | */ |
Vaibhav Jain | 7b8ad49 | 2015-11-24 16:26:18 +0530 | [diff] [blame] | 208 | ctx->pid = get_task_pid(current, PIDTYPE_PID); |
| 209 | ctx->glpid = get_task_pid(current->group_leader, PIDTYPE_PID); |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 210 | |
Ian Munsie | 9bcf28c | 2015-01-09 20:34:36 +1100 | [diff] [blame] | 211 | trace_cxl_attach(ctx, work.work_element_descriptor, work.num_interrupts, amr); |
| 212 | |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 213 | if ((rc = cxl_attach_process(ctx, false, work.work_element_descriptor, |
Ian Munsie | 456295e | 2014-12-08 19:17:57 +1100 | [diff] [blame] | 214 | amr))) { |
Michael Neuling | 6428832 | 2015-05-27 16:07:07 +1000 | [diff] [blame] | 215 | afu_release_irqs(ctx, ctx); |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 216 | goto out; |
Ian Munsie | 456295e | 2014-12-08 19:17:57 +1100 | [diff] [blame] | 217 | } |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 218 | |
| 219 | ctx->status = STARTED; |
| 220 | rc = 0; |
| 221 | out: |
| 222 | mutex_unlock(&ctx->status_mutex); |
| 223 | return rc; |
| 224 | } |
| 225 | static long afu_ioctl_process_element(struct cxl_context *ctx, |
| 226 | int __user *upe) |
| 227 | { |
| 228 | pr_devel("%s: pe: %i\n", __func__, ctx->pe); |
| 229 | |
| 230 | if (copy_to_user(upe, &ctx->pe, sizeof(__u32))) |
| 231 | return -EFAULT; |
| 232 | |
| 233 | return 0; |
| 234 | } |
| 235 | |
Vaibhav Jain | 27d4dc7 | 2015-04-29 15:47:23 +0530 | [diff] [blame] | 236 | static long afu_ioctl_get_afu_id(struct cxl_context *ctx, |
| 237 | struct cxl_afu_id __user *upafuid) |
| 238 | { |
| 239 | struct cxl_afu_id afuid = { 0 }; |
| 240 | |
| 241 | afuid.card_id = ctx->afu->adapter->adapter_num; |
| 242 | afuid.afu_offset = ctx->afu->slice; |
| 243 | afuid.afu_mode = ctx->afu->current_mode; |
| 244 | |
| 245 | /* set the flag bit in case the afu is a slave */ |
| 246 | if (ctx->afu->current_mode == CXL_MODE_DIRECTED && !ctx->master) |
| 247 | afuid.flags |= CXL_AFUID_FLAG_SLAVE; |
| 248 | |
| 249 | if (copy_to_user(upafuid, &afuid, sizeof(afuid))) |
| 250 | return -EFAULT; |
| 251 | |
| 252 | return 0; |
| 253 | } |
| 254 | |
Michael Neuling | 0520336 | 2015-05-27 16:07:17 +1000 | [diff] [blame] | 255 | long afu_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 256 | { |
| 257 | struct cxl_context *ctx = file->private_data; |
| 258 | |
| 259 | if (ctx->status == CLOSED) |
| 260 | return -EIO; |
| 261 | |
Daniel Axtens | 0b3f9c7 | 2015-08-14 17:41:18 +1000 | [diff] [blame] | 262 | if (!cxl_adapter_link_ok(ctx->afu->adapter)) |
| 263 | return -EIO; |
| 264 | |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 265 | pr_devel("afu_ioctl\n"); |
| 266 | switch (cmd) { |
| 267 | case CXL_IOCTL_START_WORK: |
| 268 | return afu_ioctl_start_work(ctx, (struct cxl_ioctl_start_work __user *)arg); |
| 269 | case CXL_IOCTL_GET_PROCESS_ELEMENT: |
| 270 | return afu_ioctl_process_element(ctx, (__u32 __user *)arg); |
Vaibhav Jain | 27d4dc7 | 2015-04-29 15:47:23 +0530 | [diff] [blame] | 271 | case CXL_IOCTL_GET_AFU_ID: |
| 272 | return afu_ioctl_get_afu_id(ctx, (struct cxl_afu_id __user *) |
| 273 | arg); |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 274 | } |
| 275 | return -EINVAL; |
| 276 | } |
| 277 | |
Daniel Axtens | 3d6b040 | 2015-08-07 13:18:18 +1000 | [diff] [blame] | 278 | static long afu_compat_ioctl(struct file *file, unsigned int cmd, |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 279 | unsigned long arg) |
| 280 | { |
| 281 | return afu_ioctl(file, cmd, arg); |
| 282 | } |
| 283 | |
Michael Neuling | 0520336 | 2015-05-27 16:07:17 +1000 | [diff] [blame] | 284 | int afu_mmap(struct file *file, struct vm_area_struct *vm) |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 285 | { |
| 286 | struct cxl_context *ctx = file->private_data; |
| 287 | |
| 288 | /* AFU must be started before we can MMIO */ |
| 289 | if (ctx->status != STARTED) |
| 290 | return -EIO; |
| 291 | |
Daniel Axtens | 0b3f9c7 | 2015-08-14 17:41:18 +1000 | [diff] [blame] | 292 | if (!cxl_adapter_link_ok(ctx->afu->adapter)) |
| 293 | return -EIO; |
| 294 | |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 295 | return cxl_context_iomap(ctx, vm); |
| 296 | } |
| 297 | |
Michael Neuling | 0520336 | 2015-05-27 16:07:17 +1000 | [diff] [blame] | 298 | unsigned int afu_poll(struct file *file, struct poll_table_struct *poll) |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 299 | { |
| 300 | struct cxl_context *ctx = file->private_data; |
| 301 | int mask = 0; |
| 302 | unsigned long flags; |
| 303 | |
| 304 | |
| 305 | poll_wait(file, &ctx->wq, poll); |
| 306 | |
| 307 | pr_devel("afu_poll wait done pe: %i\n", ctx->pe); |
| 308 | |
| 309 | spin_lock_irqsave(&ctx->lock, flags); |
| 310 | if (ctx->pending_irq || ctx->pending_fault || |
| 311 | ctx->pending_afu_err) |
| 312 | mask |= POLLIN | POLLRDNORM; |
| 313 | else if (ctx->status == CLOSED) |
| 314 | /* Only error on closed when there are no futher events pending |
| 315 | */ |
| 316 | mask |= POLLERR; |
| 317 | spin_unlock_irqrestore(&ctx->lock, flags); |
| 318 | |
| 319 | pr_devel("afu_poll pe: %i returning %#x\n", ctx->pe, mask); |
| 320 | |
| 321 | return mask; |
| 322 | } |
| 323 | |
| 324 | static inline int ctx_event_pending(struct cxl_context *ctx) |
| 325 | { |
| 326 | return (ctx->pending_irq || ctx->pending_fault || |
| 327 | ctx->pending_afu_err || (ctx->status == CLOSED)); |
| 328 | } |
| 329 | |
Michael Neuling | 0520336 | 2015-05-27 16:07:17 +1000 | [diff] [blame] | 330 | ssize_t afu_read(struct file *file, char __user *buf, size_t count, |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 331 | loff_t *off) |
| 332 | { |
| 333 | struct cxl_context *ctx = file->private_data; |
| 334 | struct cxl_event event; |
| 335 | unsigned long flags; |
Ian Munsie | d53ba6b | 2014-10-09 11:17:46 +1100 | [diff] [blame] | 336 | int rc; |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 337 | DEFINE_WAIT(wait); |
| 338 | |
Daniel Axtens | 0b3f9c7 | 2015-08-14 17:41:18 +1000 | [diff] [blame] | 339 | if (!cxl_adapter_link_ok(ctx->afu->adapter)) |
| 340 | return -EIO; |
| 341 | |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 342 | if (count < CXL_READ_MIN_SIZE) |
| 343 | return -EINVAL; |
| 344 | |
| 345 | spin_lock_irqsave(&ctx->lock, flags); |
| 346 | |
| 347 | for (;;) { |
| 348 | prepare_to_wait(&ctx->wq, &wait, TASK_INTERRUPTIBLE); |
| 349 | if (ctx_event_pending(ctx)) |
| 350 | break; |
| 351 | |
Daniel Axtens | 0b3f9c7 | 2015-08-14 17:41:18 +1000 | [diff] [blame] | 352 | if (!cxl_adapter_link_ok(ctx->afu->adapter)) { |
| 353 | rc = -EIO; |
| 354 | goto out; |
| 355 | } |
| 356 | |
Ian Munsie | d53ba6b | 2014-10-09 11:17:46 +1100 | [diff] [blame] | 357 | if (file->f_flags & O_NONBLOCK) { |
| 358 | rc = -EAGAIN; |
| 359 | goto out; |
| 360 | } |
| 361 | |
| 362 | if (signal_pending(current)) { |
| 363 | rc = -ERESTARTSYS; |
| 364 | goto out; |
| 365 | } |
| 366 | |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 367 | spin_unlock_irqrestore(&ctx->lock, flags); |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 368 | pr_devel("afu_read going to sleep...\n"); |
| 369 | schedule(); |
| 370 | pr_devel("afu_read woken up\n"); |
| 371 | spin_lock_irqsave(&ctx->lock, flags); |
| 372 | } |
| 373 | |
| 374 | finish_wait(&ctx->wq, &wait); |
| 375 | |
| 376 | memset(&event, 0, sizeof(event)); |
| 377 | event.header.process_element = ctx->pe; |
| 378 | event.header.size = sizeof(struct cxl_event_header); |
| 379 | if (ctx->pending_irq) { |
| 380 | pr_devel("afu_read delivering AFU interrupt\n"); |
| 381 | event.header.size += sizeof(struct cxl_event_afu_interrupt); |
| 382 | event.header.type = CXL_EVENT_AFU_INTERRUPT; |
| 383 | event.irq.irq = find_first_bit(ctx->irq_bitmap, ctx->irq_count) + 1; |
| 384 | clear_bit(event.irq.irq - 1, ctx->irq_bitmap); |
| 385 | if (bitmap_empty(ctx->irq_bitmap, ctx->irq_count)) |
| 386 | ctx->pending_irq = false; |
| 387 | } else if (ctx->pending_fault) { |
| 388 | pr_devel("afu_read delivering data storage fault\n"); |
| 389 | event.header.size += sizeof(struct cxl_event_data_storage); |
| 390 | event.header.type = CXL_EVENT_DATA_STORAGE; |
| 391 | event.fault.addr = ctx->fault_addr; |
| 392 | event.fault.dsisr = ctx->fault_dsisr; |
| 393 | ctx->pending_fault = false; |
| 394 | } else if (ctx->pending_afu_err) { |
| 395 | pr_devel("afu_read delivering afu error\n"); |
| 396 | event.header.size += sizeof(struct cxl_event_afu_error); |
| 397 | event.header.type = CXL_EVENT_AFU_ERROR; |
| 398 | event.afu_error.error = ctx->afu_err; |
| 399 | ctx->pending_afu_err = false; |
| 400 | } else if (ctx->status == CLOSED) { |
| 401 | pr_devel("afu_read fatal error\n"); |
| 402 | spin_unlock_irqrestore(&ctx->lock, flags); |
| 403 | return -EIO; |
| 404 | } else |
| 405 | WARN(1, "afu_read must be buggy\n"); |
| 406 | |
| 407 | spin_unlock_irqrestore(&ctx->lock, flags); |
| 408 | |
| 409 | if (copy_to_user(buf, &event, event.header.size)) |
| 410 | return -EFAULT; |
| 411 | return event.header.size; |
Ian Munsie | d53ba6b | 2014-10-09 11:17:46 +1100 | [diff] [blame] | 412 | |
| 413 | out: |
| 414 | finish_wait(&ctx->wq, &wait); |
| 415 | spin_unlock_irqrestore(&ctx->lock, flags); |
| 416 | return rc; |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 417 | } |
| 418 | |
Michael Neuling | 0520336 | 2015-05-27 16:07:17 +1000 | [diff] [blame] | 419 | /* |
| 420 | * Note: if this is updated, we need to update api.c to patch the new ones in |
| 421 | * too |
| 422 | */ |
| 423 | const struct file_operations afu_fops = { |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 424 | .owner = THIS_MODULE, |
| 425 | .open = afu_open, |
| 426 | .poll = afu_poll, |
| 427 | .read = afu_read, |
| 428 | .release = afu_release, |
| 429 | .unlocked_ioctl = afu_ioctl, |
| 430 | .compat_ioctl = afu_compat_ioctl, |
| 431 | .mmap = afu_mmap, |
| 432 | }; |
| 433 | |
Daniel Axtens | 3d6b040 | 2015-08-07 13:18:18 +1000 | [diff] [blame] | 434 | static const struct file_operations afu_master_fops = { |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 435 | .owner = THIS_MODULE, |
| 436 | .open = afu_master_open, |
| 437 | .poll = afu_poll, |
| 438 | .read = afu_read, |
| 439 | .release = afu_release, |
| 440 | .unlocked_ioctl = afu_ioctl, |
| 441 | .compat_ioctl = afu_compat_ioctl, |
| 442 | .mmap = afu_mmap, |
| 443 | }; |
| 444 | |
| 445 | |
| 446 | static char *cxl_devnode(struct device *dev, umode_t *mode) |
| 447 | { |
| 448 | if (CXL_DEVT_IS_CARD(dev->devt)) { |
| 449 | /* |
| 450 | * These minor numbers will eventually be used to program the |
| 451 | * PSL and AFUs once we have dynamic reprogramming support |
| 452 | */ |
| 453 | return NULL; |
| 454 | } |
| 455 | return kasprintf(GFP_KERNEL, "cxl/%s", dev_name(dev)); |
| 456 | } |
| 457 | |
| 458 | extern struct class *cxl_class; |
| 459 | |
| 460 | static int cxl_add_chardev(struct cxl_afu *afu, dev_t devt, struct cdev *cdev, |
| 461 | struct device **chardev, char *postfix, char *desc, |
| 462 | const struct file_operations *fops) |
| 463 | { |
| 464 | struct device *dev; |
| 465 | int rc; |
| 466 | |
| 467 | cdev_init(cdev, fops); |
| 468 | if ((rc = cdev_add(cdev, devt, 1))) { |
| 469 | dev_err(&afu->dev, "Unable to add %s chardev: %i\n", desc, rc); |
| 470 | return rc; |
| 471 | } |
| 472 | |
| 473 | dev = device_create(cxl_class, &afu->dev, devt, afu, |
| 474 | "afu%i.%i%s", afu->adapter->adapter_num, afu->slice, postfix); |
| 475 | if (IS_ERR(dev)) { |
| 476 | dev_err(&afu->dev, "Unable to create %s chardev in sysfs: %i\n", desc, rc); |
| 477 | rc = PTR_ERR(dev); |
| 478 | goto err; |
| 479 | } |
| 480 | |
| 481 | *chardev = dev; |
| 482 | |
| 483 | return 0; |
| 484 | err: |
| 485 | cdev_del(cdev); |
| 486 | return rc; |
| 487 | } |
| 488 | |
| 489 | int cxl_chardev_d_afu_add(struct cxl_afu *afu) |
| 490 | { |
| 491 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_D(afu), &afu->afu_cdev_d, |
| 492 | &afu->chardev_d, "d", "dedicated", |
| 493 | &afu_master_fops); /* Uses master fops */ |
| 494 | } |
| 495 | |
| 496 | int cxl_chardev_m_afu_add(struct cxl_afu *afu) |
| 497 | { |
| 498 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_M(afu), &afu->afu_cdev_m, |
| 499 | &afu->chardev_m, "m", "master", |
| 500 | &afu_master_fops); |
| 501 | } |
| 502 | |
| 503 | int cxl_chardev_s_afu_add(struct cxl_afu *afu) |
| 504 | { |
| 505 | return cxl_add_chardev(afu, CXL_AFU_MKDEV_S(afu), &afu->afu_cdev_s, |
| 506 | &afu->chardev_s, "s", "shared", |
| 507 | &afu_fops); |
| 508 | } |
| 509 | |
| 510 | void cxl_chardev_afu_remove(struct cxl_afu *afu) |
| 511 | { |
| 512 | if (afu->chardev_d) { |
| 513 | cdev_del(&afu->afu_cdev_d); |
| 514 | device_unregister(afu->chardev_d); |
| 515 | afu->chardev_d = NULL; |
| 516 | } |
| 517 | if (afu->chardev_m) { |
| 518 | cdev_del(&afu->afu_cdev_m); |
| 519 | device_unregister(afu->chardev_m); |
| 520 | afu->chardev_m = NULL; |
| 521 | } |
| 522 | if (afu->chardev_s) { |
| 523 | cdev_del(&afu->afu_cdev_s); |
| 524 | device_unregister(afu->chardev_s); |
| 525 | afu->chardev_s = NULL; |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | int cxl_register_afu(struct cxl_afu *afu) |
| 530 | { |
| 531 | afu->dev.class = cxl_class; |
| 532 | |
| 533 | return device_register(&afu->dev); |
| 534 | } |
| 535 | |
| 536 | int cxl_register_adapter(struct cxl *adapter) |
| 537 | { |
| 538 | adapter->dev.class = cxl_class; |
| 539 | |
| 540 | /* |
| 541 | * Future: When we support dynamically reprogramming the PSL & AFU we |
| 542 | * will expose the interface to do that via a chardev: |
| 543 | * adapter->dev.devt = CXL_CARD_MKDEV(adapter); |
| 544 | */ |
| 545 | |
| 546 | return device_register(&adapter->dev); |
| 547 | } |
| 548 | |
| 549 | int __init cxl_file_init(void) |
| 550 | { |
| 551 | int rc; |
| 552 | |
| 553 | /* |
| 554 | * If these change we really need to update API. Either change some |
| 555 | * flags or update API version number CXL_API_VERSION. |
| 556 | */ |
Ian Munsie | d9232a3 | 2015-07-23 16:43:56 +1000 | [diff] [blame] | 557 | BUILD_BUG_ON(CXL_API_VERSION != 2); |
Ian Munsie | f204e0b | 2014-10-08 19:55:02 +1100 | [diff] [blame] | 558 | BUILD_BUG_ON(sizeof(struct cxl_ioctl_start_work) != 64); |
| 559 | BUILD_BUG_ON(sizeof(struct cxl_event_header) != 8); |
| 560 | BUILD_BUG_ON(sizeof(struct cxl_event_afu_interrupt) != 8); |
| 561 | BUILD_BUG_ON(sizeof(struct cxl_event_data_storage) != 32); |
| 562 | BUILD_BUG_ON(sizeof(struct cxl_event_afu_error) != 16); |
| 563 | |
| 564 | if ((rc = alloc_chrdev_region(&cxl_dev, 0, CXL_NUM_MINORS, "cxl"))) { |
| 565 | pr_err("Unable to allocate CXL major number: %i\n", rc); |
| 566 | return rc; |
| 567 | } |
| 568 | |
| 569 | pr_devel("CXL device allocated, MAJOR %i\n", MAJOR(cxl_dev)); |
| 570 | |
| 571 | cxl_class = class_create(THIS_MODULE, "cxl"); |
| 572 | if (IS_ERR(cxl_class)) { |
| 573 | pr_err("Unable to create CXL class\n"); |
| 574 | rc = PTR_ERR(cxl_class); |
| 575 | goto err; |
| 576 | } |
| 577 | cxl_class->devnode = cxl_devnode; |
| 578 | |
| 579 | return 0; |
| 580 | |
| 581 | err: |
| 582 | unregister_chrdev_region(cxl_dev, CXL_NUM_MINORS); |
| 583 | return rc; |
| 584 | } |
| 585 | |
| 586 | void cxl_file_exit(void) |
| 587 | { |
| 588 | unregister_chrdev_region(cxl_dev, CXL_NUM_MINORS); |
| 589 | class_destroy(cxl_class); |
| 590 | } |