/* * Copyright 2014 IBM Corp. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/pci.h> #include <linux/slab.h> #include <linux/anon_inodes.h> #include <linux/file.h> #include <misc/cxl.h> #include <linux/fs.h> #include "cxl.h" struct cxl_context *cxl_dev_context_init(struct pci_dev *dev) { struct address_space *mapping; struct cxl_afu *afu; struct cxl_context *ctx; int rc; afu = cxl_pci_to_afu(dev); ctx = cxl_context_alloc(); if (IS_ERR(ctx)) { rc = PTR_ERR(ctx); goto err_dev; } ctx->kernelapi = true; /* * Make our own address space since we won't have one from the * filesystem like the user api has, and even if we do associate a file * with this context we don't want to use the global anonymous inode's * address space as that can invalidate unrelated users: */ mapping = kmalloc(sizeof(struct address_space), GFP_KERNEL); if (!mapping) { rc = -ENOMEM; goto err_ctx; } address_space_init_once(mapping); /* Make it a slave context. We can promote it later? */ rc = cxl_context_init(ctx, afu, false, mapping); if (rc) goto err_mapping; return ctx; err_mapping: kfree(mapping); err_ctx: kfree(ctx); err_dev: return ERR_PTR(rc); } EXPORT_SYMBOL_GPL(cxl_dev_context_init); struct cxl_context *cxl_get_context(struct pci_dev *dev) { return dev->dev.archdata.cxl_ctx; } EXPORT_SYMBOL_GPL(cxl_get_context); int cxl_release_context(struct cxl_context *ctx) { if (ctx->status >= STARTED) return -EBUSY; cxl_context_free(ctx); return 0; } EXPORT_SYMBOL_GPL(cxl_release_context); static irq_hw_number_t cxl_find_afu_irq(struct cxl_context *ctx, int num) { __u16 range; int r; for (r = 0; r < CXL_IRQ_RANGES; r++) { range = ctx->irqs.range[r]; if (num < range) { return ctx->irqs.offset[r] + num; } num -= range; } return 0; } int cxl_allocate_afu_irqs(struct cxl_context *ctx, int num) { int res; irq_hw_number_t hwirq; if (num == 0) num = ctx->afu->pp_irqs; res = afu_allocate_irqs(ctx, num); if (!res && !cpu_has_feature(CPU_FTR_HVMODE)) { /* In a guest, the PSL interrupt is not multiplexed. It was * allocated above, and we need to set its handler */ hwirq = cxl_find_afu_irq(ctx, 0); if (hwirq) cxl_map_irq(ctx->afu->adapter, hwirq, cxl_ops->psl_interrupt, ctx, "psl"); } return res; } EXPORT_SYMBOL_GPL(cxl_allocate_afu_irqs); void cxl_free_afu_irqs(struct cxl_context *ctx) { irq_hw_number_t hwirq; unsigned int virq; if (!cpu_has_feature(CPU_FTR_HVMODE)) { hwirq = cxl_find_afu_irq(ctx, 0); if (hwirq) { virq = irq_find_mapping(NULL, hwirq); if (virq) cxl_unmap_irq(virq, ctx); } } afu_irq_name_free(ctx); cxl_ops->release_irq_ranges(&ctx->irqs, ctx->afu->adapter); } EXPORT_SYMBOL_GPL(cxl_free_afu_irqs); int cxl_map_afu_irq(struct cxl_context *ctx, int num, irq_handler_t handler, void *cookie, char *name) { irq_hw_number_t hwirq; /* * Find interrupt we are to register. */ hwirq = cxl_find_afu_irq(ctx, num); if (!hwirq) return -ENOENT; return cxl_map_irq(ctx->afu->adapter, hwirq, handler, cookie, name); } EXPORT_SYMBOL_GPL(cxl_map_afu_irq); void cxl_unmap_afu_irq(struct cxl_context *ctx, int num, void *cookie) { irq_hw_number_t hwirq; unsigned int virq; hwirq = cxl_find_afu_irq(ctx, num); if (!hwirq) return; virq = irq_find_mapping(NULL, hwirq); if (virq) cxl_unmap_irq(virq, cookie); } EXPORT_SYMBOL_GPL(cxl_unmap_afu_irq); /* * Start a context * Code here similar to afu_ioctl_start_work(). */ int cxl_start_context(struct cxl_context *ctx, u64 wed, struct task_struct *task) { int rc = 0; bool kernel = true; pr_devel("%s: pe: %i\n", __func__, ctx->pe); mutex_lock(&ctx->status_mutex); if (ctx->status == STARTED) goto out; /* already started */ if (task) { ctx->pid = get_task_pid(task, PIDTYPE_PID); ctx->glpid = get_task_pid(task->group_leader, PIDTYPE_PID); kernel = false; ctx->real_mode = false; } cxl_ctx_get(); if ((rc = cxl_ops->attach_process(ctx, kernel, wed, 0))) { put_pid(ctx->pid); cxl_ctx_put(); goto out; } ctx->status = STARTED; out: mutex_unlock(&ctx->status_mutex); return rc; } EXPORT_SYMBOL_GPL(cxl_start_context); int cxl_process_element(struct cxl_context *ctx) { return ctx->external_pe; } EXPORT_SYMBOL_GPL(cxl_process_element); /* Stop a context. Returns 0 on success, otherwise -Errno */ int cxl_stop_context(struct cxl_context *ctx) { return __detach_context(ctx); } EXPORT_SYMBOL_GPL(cxl_stop_context); void cxl_set_master(struct cxl_context *ctx) { ctx->master = true; } EXPORT_SYMBOL_GPL(cxl_set_master); int cxl_set_translation_mode(struct cxl_context *ctx, bool real_mode) { if (ctx->status == STARTED) { /* * We could potentially update the PE and issue an update LLCMD * to support this, but it doesn't seem to have a good use case * since it's trivial to just create a second kernel context * with different translation modes, so until someone convinces * me otherwise: */ return -EBUSY; } ctx->real_mode = real_mode; return 0; } EXPORT_SYMBOL_GPL(cxl_set_translation_mode); /* wrappers around afu_* file ops which are EXPORTED */ int cxl_fd_open(struct inode *inode, struct file *file) { return afu_open(inode, file); } EXPORT_SYMBOL_GPL(cxl_fd_open); int cxl_fd_release(struct inode *inode, struct file *file) { return afu_release(inode, file); } EXPORT_SYMBOL_GPL(cxl_fd_release); long cxl_fd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { return afu_ioctl(file, cmd, arg); } EXPORT_SYMBOL_GPL(cxl_fd_ioctl); int cxl_fd_mmap(struct file *file, struct vm_area_struct *vm) { return afu_mmap(file, vm); } EXPORT_SYMBOL_GPL(cxl_fd_mmap); unsigned int cxl_fd_poll(struct file *file, struct poll_table_struct *poll) { return afu_poll(file, poll); } EXPORT_SYMBOL_GPL(cxl_fd_poll); ssize_t cxl_fd_read(struct file *file, char __user *buf, size_t count, loff_t *off) { return afu_read(file, buf, count, off); } EXPORT_SYMBOL_GPL(cxl_fd_read); #define PATCH_FOPS(NAME) if (!fops->NAME) fops->NAME = afu_fops.NAME /* Get a struct file and fd for a context and attach the ops */ struct file *cxl_get_fd(struct cxl_context *ctx, struct file_operations *fops, int *fd) { struct file *file; int rc, flags, fdtmp; flags = O_RDWR | O_CLOEXEC; /* This code is similar to anon_inode_getfd() */ rc = get_unused_fd_flags(flags); if (rc < 0) return ERR_PTR(rc); fdtmp = rc; /* * Patch the file ops. Needs to be careful that this is rentrant safe. */ if (fops) { PATCH_FOPS(open); PATCH_FOPS(poll); PATCH_FOPS(read); PATCH_FOPS(release); PATCH_FOPS(unlocked_ioctl); PATCH_FOPS(compat_ioctl); PATCH_FOPS(mmap); } else /* use default ops */ fops = (struct file_operations *)&afu_fops; file = anon_inode_getfile("cxl", fops, ctx, flags); if (IS_ERR(file)) goto err_fd; file->f_mapping = ctx->mapping; *fd = fdtmp; return file; err_fd: put_unused_fd(fdtmp); return NULL; } EXPORT_SYMBOL_GPL(cxl_get_fd); struct cxl_context *cxl_fops_get_context(struct file *file) { return file->private_data; } EXPORT_SYMBOL_GPL(cxl_fops_get_context); int cxl_start_work(struct cxl_context *ctx, struct cxl_ioctl_start_work *work) { int rc; /* code taken from afu_ioctl_start_work */ if (!(work->flags & CXL_START_WORK_NUM_IRQS)) work->num_interrupts = ctx->afu->pp_irqs; else if ((work->num_interrupts < ctx->afu->pp_irqs) || (work->num_interrupts > ctx->afu->irqs_max)) { return -EINVAL; } rc = afu_register_irqs(ctx, work->num_interrupts); if (rc) return rc; rc = cxl_start_context(ctx, work->work_element_descriptor, current); if (rc < 0) { afu_release_irqs(ctx, ctx); return rc; } return 0; } EXPORT_SYMBOL_GPL(cxl_start_work); void __iomem *cxl_psa_map(struct cxl_context *ctx) { if (ctx->status != STARTED) return NULL; pr_devel("%s: psn_phys%llx size:%llx\n", __func__, ctx->psn_phys, ctx->psn_size); return ioremap(ctx->psn_phys, ctx->psn_size); } EXPORT_SYMBOL_GPL(cxl_psa_map); void cxl_psa_unmap(void __iomem *addr) { iounmap(addr); } EXPORT_SYMBOL_GPL(cxl_psa_unmap); int cxl_afu_reset(struct cxl_context *ctx) { struct cxl_afu *afu = ctx->afu; int rc; rc = cxl_ops->afu_reset(afu); if (rc) return rc; return cxl_ops->afu_check_and_enable(afu); } EXPORT_SYMBOL_GPL(cxl_afu_reset); void cxl_perst_reloads_same_image(struct cxl_afu *afu, bool perst_reloads_same_image) { afu->adapter->perst_same_image = perst_reloads_same_image; } EXPORT_SYMBOL_GPL(cxl_perst_reloads_same_image); ssize_t cxl_read_adapter_vpd(struct pci_dev *dev, void *buf, size_t count) { struct cxl_afu *afu = cxl_pci_to_afu(dev); return cxl_ops->read_adapter_vpd(afu->adapter, buf, count); } EXPORT_SYMBOL_GPL(cxl_read_adapter_vpd);