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/pci.h> 11 #include <linux/slab.h> 12 #include <linux/anon_inodes.h> 13 #include <linux/file.h> 14 #include <misc/cxl.h> 15 #include <linux/fs.h> 16 17 #include "cxl.h" 18 19 struct cxl_context *cxl_dev_context_init(struct pci_dev *dev) 20 { 21 struct address_space *mapping; 22 struct cxl_afu *afu; 23 struct cxl_context *ctx; 24 int rc; 25 26 afu = cxl_pci_to_afu(dev); 27 28 ctx = cxl_context_alloc(); 29 if (IS_ERR(ctx)) { 30 rc = PTR_ERR(ctx); 31 goto err_dev; 32 } 33 34 ctx->kernelapi = true; 35 36 /* 37 * Make our own address space since we won't have one from the 38 * filesystem like the user api has, and even if we do associate a file 39 * with this context we don't want to use the global anonymous inode's 40 * address space as that can invalidate unrelated users: 41 */ 42 mapping = kmalloc(sizeof(struct address_space), GFP_KERNEL); 43 if (!mapping) { 44 rc = -ENOMEM; 45 goto err_ctx; 46 } 47 address_space_init_once(mapping); 48 49 /* Make it a slave context. We can promote it later? */ 50 rc = cxl_context_init(ctx, afu, false, mapping); 51 if (rc) 52 goto err_mapping; 53 54 cxl_assign_psn_space(ctx); 55 56 return ctx; 57 58 err_mapping: 59 kfree(mapping); 60 err_ctx: 61 kfree(ctx); 62 err_dev: 63 return ERR_PTR(rc); 64 } 65 EXPORT_SYMBOL_GPL(cxl_dev_context_init); 66 67 struct cxl_context *cxl_get_context(struct pci_dev *dev) 68 { 69 return dev->dev.archdata.cxl_ctx; 70 } 71 EXPORT_SYMBOL_GPL(cxl_get_context); 72 73 struct device *cxl_get_phys_dev(struct pci_dev *dev) 74 { 75 struct cxl_afu *afu; 76 77 afu = cxl_pci_to_afu(dev); 78 79 return afu->adapter->dev.parent; 80 } 81 EXPORT_SYMBOL_GPL(cxl_get_phys_dev); 82 83 int cxl_release_context(struct cxl_context *ctx) 84 { 85 if (ctx->status >= STARTED) 86 return -EBUSY; 87 88 cxl_context_free(ctx); 89 90 return 0; 91 } 92 EXPORT_SYMBOL_GPL(cxl_release_context); 93 94 int cxl_allocate_afu_irqs(struct cxl_context *ctx, int num) 95 { 96 if (num == 0) 97 num = ctx->afu->pp_irqs; 98 return afu_allocate_irqs(ctx, num); 99 } 100 EXPORT_SYMBOL_GPL(cxl_allocate_afu_irqs); 101 102 void cxl_free_afu_irqs(struct cxl_context *ctx) 103 { 104 afu_irq_name_free(ctx); 105 cxl_release_irq_ranges(&ctx->irqs, ctx->afu->adapter); 106 } 107 EXPORT_SYMBOL_GPL(cxl_free_afu_irqs); 108 109 static irq_hw_number_t cxl_find_afu_irq(struct cxl_context *ctx, int num) 110 { 111 __u16 range; 112 int r; 113 114 WARN_ON(num == 0); 115 116 for (r = 0; r < CXL_IRQ_RANGES; r++) { 117 range = ctx->irqs.range[r]; 118 if (num < range) { 119 return ctx->irqs.offset[r] + num; 120 } 121 num -= range; 122 } 123 return 0; 124 } 125 126 int cxl_map_afu_irq(struct cxl_context *ctx, int num, 127 irq_handler_t handler, void *cookie, char *name) 128 { 129 irq_hw_number_t hwirq; 130 131 /* 132 * Find interrupt we are to register. 133 */ 134 hwirq = cxl_find_afu_irq(ctx, num); 135 if (!hwirq) 136 return -ENOENT; 137 138 return cxl_map_irq(ctx->afu->adapter, hwirq, handler, cookie, name); 139 } 140 EXPORT_SYMBOL_GPL(cxl_map_afu_irq); 141 142 void cxl_unmap_afu_irq(struct cxl_context *ctx, int num, void *cookie) 143 { 144 irq_hw_number_t hwirq; 145 unsigned int virq; 146 147 hwirq = cxl_find_afu_irq(ctx, num); 148 if (!hwirq) 149 return; 150 151 virq = irq_find_mapping(NULL, hwirq); 152 if (virq) 153 cxl_unmap_irq(virq, cookie); 154 } 155 EXPORT_SYMBOL_GPL(cxl_unmap_afu_irq); 156 157 /* 158 * Start a context 159 * Code here similar to afu_ioctl_start_work(). 160 */ 161 int cxl_start_context(struct cxl_context *ctx, u64 wed, 162 struct task_struct *task) 163 { 164 int rc = 0; 165 bool kernel = true; 166 167 pr_devel("%s: pe: %i\n", __func__, ctx->pe); 168 169 mutex_lock(&ctx->status_mutex); 170 if (ctx->status == STARTED) 171 goto out; /* already started */ 172 173 if (task) { 174 ctx->pid = get_task_pid(task, PIDTYPE_PID); 175 ctx->glpid = get_task_pid(task->group_leader, PIDTYPE_PID); 176 kernel = false; 177 } 178 179 cxl_ctx_get(); 180 181 if ((rc = cxl_attach_process(ctx, kernel, wed , 0))) { 182 put_pid(ctx->pid); 183 cxl_ctx_put(); 184 goto out; 185 } 186 187 ctx->status = STARTED; 188 out: 189 mutex_unlock(&ctx->status_mutex); 190 return rc; 191 } 192 EXPORT_SYMBOL_GPL(cxl_start_context); 193 194 int cxl_process_element(struct cxl_context *ctx) 195 { 196 return ctx->pe; 197 } 198 EXPORT_SYMBOL_GPL(cxl_process_element); 199 200 /* Stop a context. Returns 0 on success, otherwise -Errno */ 201 int cxl_stop_context(struct cxl_context *ctx) 202 { 203 return __detach_context(ctx); 204 } 205 EXPORT_SYMBOL_GPL(cxl_stop_context); 206 207 void cxl_set_master(struct cxl_context *ctx) 208 { 209 ctx->master = true; 210 cxl_assign_psn_space(ctx); 211 } 212 EXPORT_SYMBOL_GPL(cxl_set_master); 213 214 /* wrappers around afu_* file ops which are EXPORTED */ 215 int cxl_fd_open(struct inode *inode, struct file *file) 216 { 217 return afu_open(inode, file); 218 } 219 EXPORT_SYMBOL_GPL(cxl_fd_open); 220 int cxl_fd_release(struct inode *inode, struct file *file) 221 { 222 return afu_release(inode, file); 223 } 224 EXPORT_SYMBOL_GPL(cxl_fd_release); 225 long cxl_fd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 226 { 227 return afu_ioctl(file, cmd, arg); 228 } 229 EXPORT_SYMBOL_GPL(cxl_fd_ioctl); 230 int cxl_fd_mmap(struct file *file, struct vm_area_struct *vm) 231 { 232 return afu_mmap(file, vm); 233 } 234 EXPORT_SYMBOL_GPL(cxl_fd_mmap); 235 unsigned int cxl_fd_poll(struct file *file, struct poll_table_struct *poll) 236 { 237 return afu_poll(file, poll); 238 } 239 EXPORT_SYMBOL_GPL(cxl_fd_poll); 240 ssize_t cxl_fd_read(struct file *file, char __user *buf, size_t count, 241 loff_t *off) 242 { 243 return afu_read(file, buf, count, off); 244 } 245 EXPORT_SYMBOL_GPL(cxl_fd_read); 246 247 #define PATCH_FOPS(NAME) if (!fops->NAME) fops->NAME = afu_fops.NAME 248 249 /* Get a struct file and fd for a context and attach the ops */ 250 struct file *cxl_get_fd(struct cxl_context *ctx, struct file_operations *fops, 251 int *fd) 252 { 253 struct file *file; 254 int rc, flags, fdtmp; 255 256 flags = O_RDWR | O_CLOEXEC; 257 258 /* This code is similar to anon_inode_getfd() */ 259 rc = get_unused_fd_flags(flags); 260 if (rc < 0) 261 return ERR_PTR(rc); 262 fdtmp = rc; 263 264 /* 265 * Patch the file ops. Needs to be careful that this is rentrant safe. 266 */ 267 if (fops) { 268 PATCH_FOPS(open); 269 PATCH_FOPS(poll); 270 PATCH_FOPS(read); 271 PATCH_FOPS(release); 272 PATCH_FOPS(unlocked_ioctl); 273 PATCH_FOPS(compat_ioctl); 274 PATCH_FOPS(mmap); 275 } else /* use default ops */ 276 fops = (struct file_operations *)&afu_fops; 277 278 file = anon_inode_getfile("cxl", fops, ctx, flags); 279 if (IS_ERR(file)) 280 goto err_fd; 281 282 file->f_mapping = ctx->mapping; 283 284 *fd = fdtmp; 285 return file; 286 287 err_fd: 288 put_unused_fd(fdtmp); 289 return NULL; 290 } 291 EXPORT_SYMBOL_GPL(cxl_get_fd); 292 293 struct cxl_context *cxl_fops_get_context(struct file *file) 294 { 295 return file->private_data; 296 } 297 EXPORT_SYMBOL_GPL(cxl_fops_get_context); 298 299 int cxl_start_work(struct cxl_context *ctx, 300 struct cxl_ioctl_start_work *work) 301 { 302 int rc; 303 304 /* code taken from afu_ioctl_start_work */ 305 if (!(work->flags & CXL_START_WORK_NUM_IRQS)) 306 work->num_interrupts = ctx->afu->pp_irqs; 307 else if ((work->num_interrupts < ctx->afu->pp_irqs) || 308 (work->num_interrupts > ctx->afu->irqs_max)) { 309 return -EINVAL; 310 } 311 312 rc = afu_register_irqs(ctx, work->num_interrupts); 313 if (rc) 314 return rc; 315 316 rc = cxl_start_context(ctx, work->work_element_descriptor, current); 317 if (rc < 0) { 318 afu_release_irqs(ctx, ctx); 319 return rc; 320 } 321 322 return 0; 323 } 324 EXPORT_SYMBOL_GPL(cxl_start_work); 325 326 void __iomem *cxl_psa_map(struct cxl_context *ctx) 327 { 328 struct cxl_afu *afu = ctx->afu; 329 int rc; 330 331 rc = cxl_afu_check_and_enable(afu); 332 if (rc) 333 return NULL; 334 335 pr_devel("%s: psn_phys%llx size:%llx\n", 336 __func__, afu->psn_phys, afu->adapter->ps_size); 337 return ioremap(ctx->psn_phys, ctx->psn_size); 338 } 339 EXPORT_SYMBOL_GPL(cxl_psa_map); 340 341 void cxl_psa_unmap(void __iomem *addr) 342 { 343 iounmap(addr); 344 } 345 EXPORT_SYMBOL_GPL(cxl_psa_unmap); 346 347 int cxl_afu_reset(struct cxl_context *ctx) 348 { 349 struct cxl_afu *afu = ctx->afu; 350 int rc; 351 352 rc = __cxl_afu_reset(afu); 353 if (rc) 354 return rc; 355 356 return cxl_afu_check_and_enable(afu); 357 } 358 EXPORT_SYMBOL_GPL(cxl_afu_reset); 359 360 void cxl_perst_reloads_same_image(struct cxl_afu *afu, 361 bool perst_reloads_same_image) 362 { 363 afu->adapter->perst_same_image = perst_reloads_same_image; 364 } 365 EXPORT_SYMBOL_GPL(cxl_perst_reloads_same_image); 366