2 * Copyright 2014 IBM Corp.
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.
10 #include <linux/pci.h>
11 #include <linux/slab.h>
12 #include <linux/anon_inodes.h>
13 #include <linux/file.h>
19 struct cxl_context *cxl_dev_context_init(struct pci_dev *dev)
21 struct address_space *mapping;
23 struct cxl_context *ctx;
26 afu = cxl_pci_to_afu(dev);
28 ctx = cxl_context_alloc();
34 ctx->kernelapi = true;
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:
42 mapping = kmalloc(sizeof(struct address_space), GFP_KERNEL);
47 address_space_init_once(mapping);
49 /* Make it a slave context. We can promote it later? */
50 rc = cxl_context_init(ctx, afu, false, mapping);
63 EXPORT_SYMBOL_GPL(cxl_dev_context_init);
65 struct cxl_context *cxl_get_context(struct pci_dev *dev)
67 return dev->dev.archdata.cxl_ctx;
69 EXPORT_SYMBOL_GPL(cxl_get_context);
71 int cxl_release_context(struct cxl_context *ctx)
73 if (ctx->status >= STARTED)
76 cxl_context_free(ctx);
80 EXPORT_SYMBOL_GPL(cxl_release_context);
82 static irq_hw_number_t cxl_find_afu_irq(struct cxl_context *ctx, int num)
87 for (r = 0; r < CXL_IRQ_RANGES; r++) {
88 range = ctx->irqs.range[r];
90 return ctx->irqs.offset[r] + num;
97 int cxl_allocate_afu_irqs(struct cxl_context *ctx, int num)
100 irq_hw_number_t hwirq;
103 num = ctx->afu->pp_irqs;
104 res = afu_allocate_irqs(ctx, num);
105 if (!res && !cpu_has_feature(CPU_FTR_HVMODE)) {
106 /* In a guest, the PSL interrupt is not multiplexed. It was
107 * allocated above, and we need to set its handler
109 hwirq = cxl_find_afu_irq(ctx, 0);
111 cxl_map_irq(ctx->afu->adapter, hwirq, cxl_ops->psl_interrupt, ctx, "psl");
115 EXPORT_SYMBOL_GPL(cxl_allocate_afu_irqs);
117 void cxl_free_afu_irqs(struct cxl_context *ctx)
119 irq_hw_number_t hwirq;
122 if (!cpu_has_feature(CPU_FTR_HVMODE)) {
123 hwirq = cxl_find_afu_irq(ctx, 0);
125 virq = irq_find_mapping(NULL, hwirq);
127 cxl_unmap_irq(virq, ctx);
130 afu_irq_name_free(ctx);
131 cxl_ops->release_irq_ranges(&ctx->irqs, ctx->afu->adapter);
133 EXPORT_SYMBOL_GPL(cxl_free_afu_irqs);
135 int cxl_map_afu_irq(struct cxl_context *ctx, int num,
136 irq_handler_t handler, void *cookie, char *name)
138 irq_hw_number_t hwirq;
141 * Find interrupt we are to register.
143 hwirq = cxl_find_afu_irq(ctx, num);
147 return cxl_map_irq(ctx->afu->adapter, hwirq, handler, cookie, name);
149 EXPORT_SYMBOL_GPL(cxl_map_afu_irq);
151 void cxl_unmap_afu_irq(struct cxl_context *ctx, int num, void *cookie)
153 irq_hw_number_t hwirq;
156 hwirq = cxl_find_afu_irq(ctx, num);
160 virq = irq_find_mapping(NULL, hwirq);
162 cxl_unmap_irq(virq, cookie);
164 EXPORT_SYMBOL_GPL(cxl_unmap_afu_irq);
168 * Code here similar to afu_ioctl_start_work().
170 int cxl_start_context(struct cxl_context *ctx, u64 wed,
171 struct task_struct *task)
176 pr_devel("%s: pe: %i\n", __func__, ctx->pe);
178 mutex_lock(&ctx->status_mutex);
179 if (ctx->status == STARTED)
180 goto out; /* already started */
183 ctx->pid = get_task_pid(task, PIDTYPE_PID);
184 ctx->glpid = get_task_pid(task->group_leader, PIDTYPE_PID);
186 ctx->real_mode = false;
191 if ((rc = cxl_ops->attach_process(ctx, kernel, wed, 0))) {
197 ctx->status = STARTED;
199 mutex_unlock(&ctx->status_mutex);
202 EXPORT_SYMBOL_GPL(cxl_start_context);
204 int cxl_process_element(struct cxl_context *ctx)
206 return ctx->external_pe;
208 EXPORT_SYMBOL_GPL(cxl_process_element);
210 /* Stop a context. Returns 0 on success, otherwise -Errno */
211 int cxl_stop_context(struct cxl_context *ctx)
213 return __detach_context(ctx);
215 EXPORT_SYMBOL_GPL(cxl_stop_context);
217 void cxl_set_master(struct cxl_context *ctx)
221 EXPORT_SYMBOL_GPL(cxl_set_master);
223 int cxl_set_translation_mode(struct cxl_context *ctx, bool real_mode)
225 if (ctx->status == STARTED) {
227 * We could potentially update the PE and issue an update LLCMD
228 * to support this, but it doesn't seem to have a good use case
229 * since it's trivial to just create a second kernel context
230 * with different translation modes, so until someone convinces
236 ctx->real_mode = real_mode;
239 EXPORT_SYMBOL_GPL(cxl_set_translation_mode);
241 /* wrappers around afu_* file ops which are EXPORTED */
242 int cxl_fd_open(struct inode *inode, struct file *file)
244 return afu_open(inode, file);
246 EXPORT_SYMBOL_GPL(cxl_fd_open);
247 int cxl_fd_release(struct inode *inode, struct file *file)
249 return afu_release(inode, file);
251 EXPORT_SYMBOL_GPL(cxl_fd_release);
252 long cxl_fd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
254 return afu_ioctl(file, cmd, arg);
256 EXPORT_SYMBOL_GPL(cxl_fd_ioctl);
257 int cxl_fd_mmap(struct file *file, struct vm_area_struct *vm)
259 return afu_mmap(file, vm);
261 EXPORT_SYMBOL_GPL(cxl_fd_mmap);
262 unsigned int cxl_fd_poll(struct file *file, struct poll_table_struct *poll)
264 return afu_poll(file, poll);
266 EXPORT_SYMBOL_GPL(cxl_fd_poll);
267 ssize_t cxl_fd_read(struct file *file, char __user *buf, size_t count,
270 return afu_read(file, buf, count, off);
272 EXPORT_SYMBOL_GPL(cxl_fd_read);
274 #define PATCH_FOPS(NAME) if (!fops->NAME) fops->NAME = afu_fops.NAME
276 /* Get a struct file and fd for a context and attach the ops */
277 struct file *cxl_get_fd(struct cxl_context *ctx, struct file_operations *fops,
281 int rc, flags, fdtmp;
283 flags = O_RDWR | O_CLOEXEC;
285 /* This code is similar to anon_inode_getfd() */
286 rc = get_unused_fd_flags(flags);
292 * Patch the file ops. Needs to be careful that this is rentrant safe.
299 PATCH_FOPS(unlocked_ioctl);
300 PATCH_FOPS(compat_ioctl);
302 } else /* use default ops */
303 fops = (struct file_operations *)&afu_fops;
305 file = anon_inode_getfile("cxl", fops, ctx, flags);
309 file->f_mapping = ctx->mapping;
315 put_unused_fd(fdtmp);
318 EXPORT_SYMBOL_GPL(cxl_get_fd);
320 struct cxl_context *cxl_fops_get_context(struct file *file)
322 return file->private_data;
324 EXPORT_SYMBOL_GPL(cxl_fops_get_context);
326 int cxl_start_work(struct cxl_context *ctx,
327 struct cxl_ioctl_start_work *work)
331 /* code taken from afu_ioctl_start_work */
332 if (!(work->flags & CXL_START_WORK_NUM_IRQS))
333 work->num_interrupts = ctx->afu->pp_irqs;
334 else if ((work->num_interrupts < ctx->afu->pp_irqs) ||
335 (work->num_interrupts > ctx->afu->irqs_max)) {
339 rc = afu_register_irqs(ctx, work->num_interrupts);
343 rc = cxl_start_context(ctx, work->work_element_descriptor, current);
345 afu_release_irqs(ctx, ctx);
351 EXPORT_SYMBOL_GPL(cxl_start_work);
353 void __iomem *cxl_psa_map(struct cxl_context *ctx)
355 if (ctx->status != STARTED)
358 pr_devel("%s: psn_phys%llx size:%llx\n",
359 __func__, ctx->psn_phys, ctx->psn_size);
360 return ioremap(ctx->psn_phys, ctx->psn_size);
362 EXPORT_SYMBOL_GPL(cxl_psa_map);
364 void cxl_psa_unmap(void __iomem *addr)
368 EXPORT_SYMBOL_GPL(cxl_psa_unmap);
370 int cxl_afu_reset(struct cxl_context *ctx)
372 struct cxl_afu *afu = ctx->afu;
375 rc = cxl_ops->afu_reset(afu);
379 return cxl_ops->afu_check_and_enable(afu);
381 EXPORT_SYMBOL_GPL(cxl_afu_reset);
383 void cxl_perst_reloads_same_image(struct cxl_afu *afu,
384 bool perst_reloads_same_image)
386 afu->adapter->perst_same_image = perst_reloads_same_image;
388 EXPORT_SYMBOL_GPL(cxl_perst_reloads_same_image);
390 ssize_t cxl_read_adapter_vpd(struct pci_dev *dev, void *buf, size_t count)
392 struct cxl_afu *afu = cxl_pci_to_afu(dev);
394 return cxl_ops->read_adapter_vpd(afu->adapter, buf, count);
396 EXPORT_SYMBOL_GPL(cxl_read_adapter_vpd);