2015-05-27 14:07:18 +08:00
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/*
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* Copyright 2014 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/anon_inodes.h>
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#include <linux/file.h>
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#include <misc/cxl.h>
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2015-08-27 17:50:19 +08:00
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#include <linux/fs.h>
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2015-05-27 14:07:18 +08:00
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#include "cxl.h"
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struct cxl_context *cxl_dev_context_init(struct pci_dev *dev)
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{
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2015-08-27 17:50:19 +08:00
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struct address_space *mapping;
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2015-05-27 14:07:18 +08:00
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struct cxl_afu *afu;
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struct cxl_context *ctx;
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int rc;
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afu = cxl_pci_to_afu(dev);
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ctx = cxl_context_alloc();
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2015-08-27 17:50:18 +08:00
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if (IS_ERR(ctx)) {
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rc = PTR_ERR(ctx);
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goto err_dev;
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}
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2015-05-27 14:07:18 +08:00
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2015-08-27 17:50:19 +08:00
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ctx->kernelapi = true;
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/*
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* Make our own address space since we won't have one from the
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* filesystem like the user api has, and even if we do associate a file
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* with this context we don't want to use the global anonymous inode's
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* address space as that can invalidate unrelated users:
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*/
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mapping = kmalloc(sizeof(struct address_space), GFP_KERNEL);
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if (!mapping) {
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rc = -ENOMEM;
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goto err_ctx;
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}
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address_space_init_once(mapping);
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2015-05-27 14:07:18 +08:00
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/* Make it a slave context. We can promote it later? */
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2015-08-27 17:50:19 +08:00
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rc = cxl_context_init(ctx, afu, false, mapping);
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2015-08-27 17:50:18 +08:00
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if (rc)
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2015-08-27 17:50:19 +08:00
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goto err_mapping;
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2015-05-27 14:07:18 +08:00
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return ctx;
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2015-08-27 17:50:18 +08:00
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2015-08-27 17:50:19 +08:00
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err_mapping:
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kfree(mapping);
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2015-08-27 17:50:18 +08:00
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err_ctx:
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kfree(ctx);
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err_dev:
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return ERR_PTR(rc);
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2015-05-27 14:07:18 +08:00
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}
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EXPORT_SYMBOL_GPL(cxl_dev_context_init);
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struct cxl_context *cxl_get_context(struct pci_dev *dev)
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{
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return dev->dev.archdata.cxl_ctx;
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}
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EXPORT_SYMBOL_GPL(cxl_get_context);
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struct device *cxl_get_phys_dev(struct pci_dev *dev)
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{
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struct cxl_afu *afu;
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afu = cxl_pci_to_afu(dev);
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return afu->adapter->dev.parent;
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}
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EXPORT_SYMBOL_GPL(cxl_get_phys_dev);
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int cxl_release_context(struct cxl_context *ctx)
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{
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2015-08-19 07:27:18 +08:00
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if (ctx->status >= STARTED)
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2015-05-27 14:07:18 +08:00
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return -EBUSY;
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cxl_context_free(ctx);
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return 0;
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}
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EXPORT_SYMBOL_GPL(cxl_release_context);
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int cxl_allocate_afu_irqs(struct cxl_context *ctx, int num)
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{
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if (num == 0)
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num = ctx->afu->pp_irqs;
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return afu_allocate_irqs(ctx, num);
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}
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EXPORT_SYMBOL_GPL(cxl_allocate_afu_irqs);
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void cxl_free_afu_irqs(struct cxl_context *ctx)
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{
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2015-09-30 09:58:05 +08:00
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afu_irq_name_free(ctx);
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2016-03-04 19:26:28 +08:00
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cxl_ops->release_irq_ranges(&ctx->irqs, ctx->afu->adapter);
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2015-05-27 14:07:18 +08:00
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}
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EXPORT_SYMBOL_GPL(cxl_free_afu_irqs);
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static irq_hw_number_t cxl_find_afu_irq(struct cxl_context *ctx, int num)
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{
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__u16 range;
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int r;
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WARN_ON(num == 0);
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for (r = 0; r < CXL_IRQ_RANGES; r++) {
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range = ctx->irqs.range[r];
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if (num < range) {
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return ctx->irqs.offset[r] + num;
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}
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num -= range;
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}
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return 0;
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}
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int cxl_map_afu_irq(struct cxl_context *ctx, int num,
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irq_handler_t handler, void *cookie, char *name)
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{
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irq_hw_number_t hwirq;
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/*
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* Find interrupt we are to register.
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*/
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hwirq = cxl_find_afu_irq(ctx, num);
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if (!hwirq)
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return -ENOENT;
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return cxl_map_irq(ctx->afu->adapter, hwirq, handler, cookie, name);
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}
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EXPORT_SYMBOL_GPL(cxl_map_afu_irq);
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void cxl_unmap_afu_irq(struct cxl_context *ctx, int num, void *cookie)
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{
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irq_hw_number_t hwirq;
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unsigned int virq;
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hwirq = cxl_find_afu_irq(ctx, num);
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if (!hwirq)
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return;
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virq = irq_find_mapping(NULL, hwirq);
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if (virq)
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cxl_unmap_irq(virq, cookie);
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}
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EXPORT_SYMBOL_GPL(cxl_unmap_afu_irq);
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/*
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* Start a context
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* Code here similar to afu_ioctl_start_work().
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*/
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int cxl_start_context(struct cxl_context *ctx, u64 wed,
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struct task_struct *task)
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{
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int rc = 0;
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bool kernel = true;
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pr_devel("%s: pe: %i\n", __func__, ctx->pe);
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mutex_lock(&ctx->status_mutex);
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if (ctx->status == STARTED)
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goto out; /* already started */
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if (task) {
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ctx->pid = get_task_pid(task, PIDTYPE_PID);
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2015-11-24 18:56:18 +08:00
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ctx->glpid = get_task_pid(task->group_leader, PIDTYPE_PID);
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2015-05-27 14:07:18 +08:00
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kernel = false;
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}
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cxl_ctx_get();
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2016-03-04 19:26:28 +08:00
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if ((rc = cxl_ops->attach_process(ctx, kernel, wed, 0))) {
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2015-05-27 14:07:18 +08:00
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put_pid(ctx->pid);
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cxl_ctx_put();
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goto out;
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}
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ctx->status = STARTED;
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out:
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mutex_unlock(&ctx->status_mutex);
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return rc;
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}
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EXPORT_SYMBOL_GPL(cxl_start_context);
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int cxl_process_element(struct cxl_context *ctx)
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{
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return ctx->pe;
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}
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EXPORT_SYMBOL_GPL(cxl_process_element);
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/* Stop a context. Returns 0 on success, otherwise -Errno */
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int cxl_stop_context(struct cxl_context *ctx)
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{
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2015-07-07 09:01:17 +08:00
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return __detach_context(ctx);
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2015-05-27 14:07:18 +08:00
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}
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EXPORT_SYMBOL_GPL(cxl_stop_context);
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void cxl_set_master(struct cxl_context *ctx)
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{
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ctx->master = true;
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}
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EXPORT_SYMBOL_GPL(cxl_set_master);
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/* wrappers around afu_* file ops which are EXPORTED */
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int cxl_fd_open(struct inode *inode, struct file *file)
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{
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return afu_open(inode, file);
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}
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EXPORT_SYMBOL_GPL(cxl_fd_open);
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int cxl_fd_release(struct inode *inode, struct file *file)
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{
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return afu_release(inode, file);
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}
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EXPORT_SYMBOL_GPL(cxl_fd_release);
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long cxl_fd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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return afu_ioctl(file, cmd, arg);
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}
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EXPORT_SYMBOL_GPL(cxl_fd_ioctl);
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int cxl_fd_mmap(struct file *file, struct vm_area_struct *vm)
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{
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return afu_mmap(file, vm);
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}
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EXPORT_SYMBOL_GPL(cxl_fd_mmap);
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unsigned int cxl_fd_poll(struct file *file, struct poll_table_struct *poll)
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{
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return afu_poll(file, poll);
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}
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EXPORT_SYMBOL_GPL(cxl_fd_poll);
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ssize_t cxl_fd_read(struct file *file, char __user *buf, size_t count,
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loff_t *off)
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{
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return afu_read(file, buf, count, off);
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}
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EXPORT_SYMBOL_GPL(cxl_fd_read);
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#define PATCH_FOPS(NAME) if (!fops->NAME) fops->NAME = afu_fops.NAME
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/* Get a struct file and fd for a context and attach the ops */
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struct file *cxl_get_fd(struct cxl_context *ctx, struct file_operations *fops,
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int *fd)
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{
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struct file *file;
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int rc, flags, fdtmp;
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flags = O_RDWR | O_CLOEXEC;
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/* This code is similar to anon_inode_getfd() */
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rc = get_unused_fd_flags(flags);
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if (rc < 0)
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return ERR_PTR(rc);
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fdtmp = rc;
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/*
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* Patch the file ops. Needs to be careful that this is rentrant safe.
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*/
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if (fops) {
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PATCH_FOPS(open);
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PATCH_FOPS(poll);
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PATCH_FOPS(read);
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PATCH_FOPS(release);
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PATCH_FOPS(unlocked_ioctl);
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PATCH_FOPS(compat_ioctl);
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PATCH_FOPS(mmap);
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} else /* use default ops */
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fops = (struct file_operations *)&afu_fops;
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file = anon_inode_getfile("cxl", fops, ctx, flags);
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if (IS_ERR(file))
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2015-08-27 17:50:19 +08:00
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goto err_fd;
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file->f_mapping = ctx->mapping;
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2015-05-27 14:07:18 +08:00
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*fd = fdtmp;
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return file;
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2015-08-27 17:50:19 +08:00
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err_fd:
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put_unused_fd(fdtmp);
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return NULL;
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2015-05-27 14:07:18 +08:00
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}
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EXPORT_SYMBOL_GPL(cxl_get_fd);
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struct cxl_context *cxl_fops_get_context(struct file *file)
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{
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return file->private_data;
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}
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EXPORT_SYMBOL_GPL(cxl_fops_get_context);
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int cxl_start_work(struct cxl_context *ctx,
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struct cxl_ioctl_start_work *work)
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{
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int rc;
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/* code taken from afu_ioctl_start_work */
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if (!(work->flags & CXL_START_WORK_NUM_IRQS))
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work->num_interrupts = ctx->afu->pp_irqs;
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else if ((work->num_interrupts < ctx->afu->pp_irqs) ||
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(work->num_interrupts > ctx->afu->irqs_max)) {
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return -EINVAL;
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}
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rc = afu_register_irqs(ctx, work->num_interrupts);
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if (rc)
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return rc;
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rc = cxl_start_context(ctx, work->work_element_descriptor, current);
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if (rc < 0) {
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afu_release_irqs(ctx, ctx);
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return rc;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(cxl_start_work);
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void __iomem *cxl_psa_map(struct cxl_context *ctx)
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{
|
2016-03-04 19:26:27 +08:00
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if (ctx->status != STARTED)
|
2015-05-27 14:07:18 +08:00
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return NULL;
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pr_devel("%s: psn_phys%llx size:%llx\n",
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2016-03-04 19:26:27 +08:00
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__func__, ctx->psn_phys, ctx->psn_size);
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2015-05-27 14:07:18 +08:00
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return ioremap(ctx->psn_phys, ctx->psn_size);
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}
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EXPORT_SYMBOL_GPL(cxl_psa_map);
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void cxl_psa_unmap(void __iomem *addr)
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{
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iounmap(addr);
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}
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EXPORT_SYMBOL_GPL(cxl_psa_unmap);
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int cxl_afu_reset(struct cxl_context *ctx)
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{
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struct cxl_afu *afu = ctx->afu;
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int rc;
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|
2016-03-04 19:26:28 +08:00
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rc = cxl_ops->afu_reset(afu);
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2015-05-27 14:07:18 +08:00
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if (rc)
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return rc;
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2016-03-04 19:26:28 +08:00
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return cxl_ops->afu_check_and_enable(afu);
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2015-05-27 14:07:18 +08:00
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}
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EXPORT_SYMBOL_GPL(cxl_afu_reset);
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2015-08-14 15:41:25 +08:00
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void cxl_perst_reloads_same_image(struct cxl_afu *afu,
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bool perst_reloads_same_image)
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{
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afu->adapter->perst_same_image = perst_reloads_same_image;
|
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}
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EXPORT_SYMBOL_GPL(cxl_perst_reloads_same_image);
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