![Ingo Molnar](/assets/img/avatar_default.png)
Fix up affected files that include this signal functionality via sched.h. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
661 lines
16 KiB
C
661 lines
16 KiB
C
/*
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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/spinlock.h>
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#include <linux/module.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/bitmap.h>
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#include <linux/sched/signal.h>
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#include <linux/poll.h>
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#include <linux/pid.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <asm/cputable.h>
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#include <asm/current.h>
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#include <asm/copro.h>
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#include "cxl.h"
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#include "trace.h"
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#define CXL_NUM_MINORS 256 /* Total to reserve */
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#define CXL_AFU_MINOR_D(afu) (CXL_CARD_MINOR(afu->adapter) + 1 + (3 * afu->slice))
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#define CXL_AFU_MINOR_M(afu) (CXL_AFU_MINOR_D(afu) + 1)
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#define CXL_AFU_MINOR_S(afu) (CXL_AFU_MINOR_D(afu) + 2)
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#define CXL_AFU_MKDEV_D(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_D(afu))
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#define CXL_AFU_MKDEV_M(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_M(afu))
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#define CXL_AFU_MKDEV_S(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_S(afu))
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#define CXL_DEVT_AFU(dev) ((MINOR(dev) % CXL_DEV_MINORS - 1) / 3)
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#define CXL_DEVT_IS_CARD(dev) (MINOR(dev) % CXL_DEV_MINORS == 0)
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static dev_t cxl_dev;
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static struct class *cxl_class;
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static int __afu_open(struct inode *inode, struct file *file, bool master)
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{
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struct cxl *adapter;
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struct cxl_afu *afu;
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struct cxl_context *ctx;
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int adapter_num = CXL_DEVT_ADAPTER(inode->i_rdev);
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int slice = CXL_DEVT_AFU(inode->i_rdev);
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int rc = -ENODEV;
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pr_devel("afu_open afu%i.%i\n", slice, adapter_num);
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if (!(adapter = get_cxl_adapter(adapter_num)))
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return -ENODEV;
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if (slice > adapter->slices)
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goto err_put_adapter;
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spin_lock(&adapter->afu_list_lock);
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if (!(afu = adapter->afu[slice])) {
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spin_unlock(&adapter->afu_list_lock);
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goto err_put_adapter;
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}
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/*
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* taking a ref to the afu so that it doesn't go away
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* for rest of the function. This ref is released before
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* we return.
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*/
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cxl_afu_get(afu);
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spin_unlock(&adapter->afu_list_lock);
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if (!afu->current_mode)
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goto err_put_afu;
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if (!cxl_ops->link_ok(adapter, afu)) {
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rc = -EIO;
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goto err_put_afu;
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}
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if (!(ctx = cxl_context_alloc())) {
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rc = -ENOMEM;
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goto err_put_afu;
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}
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rc = cxl_context_init(ctx, afu, master);
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if (rc)
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goto err_put_afu;
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cxl_context_set_mapping(ctx, inode->i_mapping);
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pr_devel("afu_open pe: %i\n", ctx->pe);
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file->private_data = ctx;
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cxl_ctx_get();
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/* indicate success */
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rc = 0;
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err_put_afu:
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/* release the ref taken earlier */
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cxl_afu_put(afu);
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err_put_adapter:
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put_device(&adapter->dev);
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return rc;
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}
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int afu_open(struct inode *inode, struct file *file)
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{
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return __afu_open(inode, file, false);
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}
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static int afu_master_open(struct inode *inode, struct file *file)
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{
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return __afu_open(inode, file, true);
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}
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int afu_release(struct inode *inode, struct file *file)
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{
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struct cxl_context *ctx = file->private_data;
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pr_devel("%s: closing cxl file descriptor. pe: %i\n",
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__func__, ctx->pe);
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cxl_context_detach(ctx);
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/*
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* Delete the context's mapping pointer, unless it's created by the
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* kernel API, in which case leave it so it can be freed by reclaim_ctx()
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*/
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if (!ctx->kernelapi) {
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mutex_lock(&ctx->mapping_lock);
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ctx->mapping = NULL;
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mutex_unlock(&ctx->mapping_lock);
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}
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/*
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* At this this point all bottom halfs have finished and we should be
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* getting no more IRQs from the hardware for this context. Once it's
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* removed from the IDR (and RCU synchronised) it's safe to free the
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* sstp and context.
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*/
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cxl_context_free(ctx);
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return 0;
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}
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static long afu_ioctl_start_work(struct cxl_context *ctx,
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struct cxl_ioctl_start_work __user *uwork)
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{
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struct cxl_ioctl_start_work work;
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u64 amr = 0;
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int rc;
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pr_devel("%s: pe: %i\n", __func__, ctx->pe);
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/* Do this outside the status_mutex to avoid a circular dependency with
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* the locking in cxl_mmap_fault() */
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if (copy_from_user(&work, uwork,
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sizeof(struct cxl_ioctl_start_work))) {
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rc = -EFAULT;
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goto out;
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}
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mutex_lock(&ctx->status_mutex);
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if (ctx->status != OPENED) {
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rc = -EIO;
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goto out;
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}
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/*
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* if any of the reserved fields are set or any of the unused
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* flags are set it's invalid
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*/
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if (work.reserved1 || work.reserved2 || work.reserved3 ||
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work.reserved4 || work.reserved5 || work.reserved6 ||
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(work.flags & ~CXL_START_WORK_ALL)) {
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rc = -EINVAL;
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goto out;
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}
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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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rc = -EINVAL;
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goto out;
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}
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if ((rc = afu_register_irqs(ctx, work.num_interrupts)))
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goto out;
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if (work.flags & CXL_START_WORK_AMR)
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amr = work.amr & mfspr(SPRN_UAMOR);
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ctx->mmio_err_ff = !!(work.flags & CXL_START_WORK_ERR_FF);
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/*
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* Increment the mapped context count for adapter. This also checks
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* if adapter_context_lock is taken.
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*/
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rc = cxl_adapter_context_get(ctx->afu->adapter);
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if (rc) {
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afu_release_irqs(ctx, ctx);
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goto out;
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}
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/*
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* We grab the PID here and not in the file open to allow for the case
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* where a process (master, some daemon, etc) has opened the chardev on
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* behalf of another process, so the AFU's mm gets bound to the process
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* that performs this ioctl and not the process that opened the file.
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* Also we grab the PID of the group leader so that if the task that
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* has performed the attach operation exits the mm context of the
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* process is still accessible.
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*/
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ctx->pid = get_task_pid(current, PIDTYPE_PID);
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ctx->glpid = get_task_pid(current->group_leader, PIDTYPE_PID);
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trace_cxl_attach(ctx, work.work_element_descriptor, work.num_interrupts, amr);
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if ((rc = cxl_ops->attach_process(ctx, false, work.work_element_descriptor,
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amr))) {
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afu_release_irqs(ctx, ctx);
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cxl_adapter_context_put(ctx->afu->adapter);
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put_pid(ctx->glpid);
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put_pid(ctx->pid);
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ctx->glpid = ctx->pid = NULL;
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goto out;
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}
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ctx->status = STARTED;
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rc = 0;
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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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static long afu_ioctl_process_element(struct cxl_context *ctx,
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int __user *upe)
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{
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pr_devel("%s: pe: %i\n", __func__, ctx->pe);
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if (copy_to_user(upe, &ctx->external_pe, sizeof(__u32)))
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return -EFAULT;
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return 0;
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}
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static long afu_ioctl_get_afu_id(struct cxl_context *ctx,
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struct cxl_afu_id __user *upafuid)
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{
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struct cxl_afu_id afuid = { 0 };
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afuid.card_id = ctx->afu->adapter->adapter_num;
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afuid.afu_offset = ctx->afu->slice;
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afuid.afu_mode = ctx->afu->current_mode;
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/* set the flag bit in case the afu is a slave */
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if (ctx->afu->current_mode == CXL_MODE_DIRECTED && !ctx->master)
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afuid.flags |= CXL_AFUID_FLAG_SLAVE;
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if (copy_to_user(upafuid, &afuid, sizeof(afuid)))
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return -EFAULT;
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return 0;
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}
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long afu_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct cxl_context *ctx = file->private_data;
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if (ctx->status == CLOSED)
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return -EIO;
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if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
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return -EIO;
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pr_devel("afu_ioctl\n");
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switch (cmd) {
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case CXL_IOCTL_START_WORK:
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return afu_ioctl_start_work(ctx, (struct cxl_ioctl_start_work __user *)arg);
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case CXL_IOCTL_GET_PROCESS_ELEMENT:
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return afu_ioctl_process_element(ctx, (__u32 __user *)arg);
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case CXL_IOCTL_GET_AFU_ID:
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return afu_ioctl_get_afu_id(ctx, (struct cxl_afu_id __user *)
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arg);
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}
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return -EINVAL;
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}
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static long afu_compat_ioctl(struct file *file, unsigned int cmd,
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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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int afu_mmap(struct file *file, struct vm_area_struct *vm)
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{
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struct cxl_context *ctx = file->private_data;
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/* AFU must be started before we can MMIO */
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if (ctx->status != STARTED)
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return -EIO;
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if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
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return -EIO;
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return cxl_context_iomap(ctx, vm);
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}
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static inline bool ctx_event_pending(struct cxl_context *ctx)
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{
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if (ctx->pending_irq || ctx->pending_fault || ctx->pending_afu_err)
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return true;
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if (ctx->afu_driver_ops && atomic_read(&ctx->afu_driver_events))
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return true;
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return false;
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}
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unsigned int afu_poll(struct file *file, struct poll_table_struct *poll)
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{
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struct cxl_context *ctx = file->private_data;
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int mask = 0;
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unsigned long flags;
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poll_wait(file, &ctx->wq, poll);
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pr_devel("afu_poll wait done pe: %i\n", ctx->pe);
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spin_lock_irqsave(&ctx->lock, flags);
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if (ctx_event_pending(ctx))
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mask |= POLLIN | POLLRDNORM;
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else if (ctx->status == CLOSED)
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/* Only error on closed when there are no futher events pending
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*/
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mask |= POLLERR;
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spin_unlock_irqrestore(&ctx->lock, flags);
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pr_devel("afu_poll pe: %i returning %#x\n", ctx->pe, mask);
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return mask;
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}
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static ssize_t afu_driver_event_copy(struct cxl_context *ctx,
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char __user *buf,
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struct cxl_event *event,
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struct cxl_event_afu_driver_reserved *pl)
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{
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/* Check event */
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if (!pl) {
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ctx->afu_driver_ops->event_delivered(ctx, pl, -EINVAL);
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return -EFAULT;
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}
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/* Check event size */
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event->header.size += pl->data_size;
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if (event->header.size > CXL_READ_MIN_SIZE) {
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ctx->afu_driver_ops->event_delivered(ctx, pl, -EINVAL);
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return -EFAULT;
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}
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/* Copy event header */
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if (copy_to_user(buf, event, sizeof(struct cxl_event_header))) {
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ctx->afu_driver_ops->event_delivered(ctx, pl, -EFAULT);
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return -EFAULT;
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}
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/* Copy event data */
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buf += sizeof(struct cxl_event_header);
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if (copy_to_user(buf, &pl->data, pl->data_size)) {
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ctx->afu_driver_ops->event_delivered(ctx, pl, -EFAULT);
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return -EFAULT;
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}
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ctx->afu_driver_ops->event_delivered(ctx, pl, 0); /* Success */
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return event->header.size;
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}
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ssize_t afu_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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struct cxl_context *ctx = file->private_data;
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struct cxl_event_afu_driver_reserved *pl = NULL;
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struct cxl_event event;
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unsigned long flags;
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int rc;
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DEFINE_WAIT(wait);
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if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
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return -EIO;
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if (count < CXL_READ_MIN_SIZE)
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return -EINVAL;
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spin_lock_irqsave(&ctx->lock, flags);
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for (;;) {
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prepare_to_wait(&ctx->wq, &wait, TASK_INTERRUPTIBLE);
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if (ctx_event_pending(ctx) || (ctx->status == CLOSED))
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break;
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if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) {
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rc = -EIO;
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goto out;
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}
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if (file->f_flags & O_NONBLOCK) {
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rc = -EAGAIN;
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goto out;
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}
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if (signal_pending(current)) {
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rc = -ERESTARTSYS;
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goto out;
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}
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spin_unlock_irqrestore(&ctx->lock, flags);
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pr_devel("afu_read going to sleep...\n");
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schedule();
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pr_devel("afu_read woken up\n");
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spin_lock_irqsave(&ctx->lock, flags);
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}
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finish_wait(&ctx->wq, &wait);
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memset(&event, 0, sizeof(event));
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event.header.process_element = ctx->pe;
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event.header.size = sizeof(struct cxl_event_header);
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if (ctx->afu_driver_ops && atomic_read(&ctx->afu_driver_events)) {
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pr_devel("afu_read delivering AFU driver specific event\n");
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pl = ctx->afu_driver_ops->fetch_event(ctx);
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atomic_dec(&ctx->afu_driver_events);
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event.header.type = CXL_EVENT_AFU_DRIVER;
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} else if (ctx->pending_irq) {
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pr_devel("afu_read delivering AFU interrupt\n");
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event.header.size += sizeof(struct cxl_event_afu_interrupt);
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event.header.type = CXL_EVENT_AFU_INTERRUPT;
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event.irq.irq = find_first_bit(ctx->irq_bitmap, ctx->irq_count) + 1;
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clear_bit(event.irq.irq - 1, ctx->irq_bitmap);
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if (bitmap_empty(ctx->irq_bitmap, ctx->irq_count))
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ctx->pending_irq = false;
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} else if (ctx->pending_fault) {
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pr_devel("afu_read delivering data storage fault\n");
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event.header.size += sizeof(struct cxl_event_data_storage);
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event.header.type = CXL_EVENT_DATA_STORAGE;
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event.fault.addr = ctx->fault_addr;
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event.fault.dsisr = ctx->fault_dsisr;
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ctx->pending_fault = false;
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} else if (ctx->pending_afu_err) {
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pr_devel("afu_read delivering afu error\n");
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event.header.size += sizeof(struct cxl_event_afu_error);
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event.header.type = CXL_EVENT_AFU_ERROR;
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event.afu_error.error = ctx->afu_err;
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ctx->pending_afu_err = false;
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} else if (ctx->status == CLOSED) {
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pr_devel("afu_read fatal error\n");
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spin_unlock_irqrestore(&ctx->lock, flags);
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return -EIO;
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} else
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WARN(1, "afu_read must be buggy\n");
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spin_unlock_irqrestore(&ctx->lock, flags);
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if (event.header.type == CXL_EVENT_AFU_DRIVER)
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return afu_driver_event_copy(ctx, buf, &event, pl);
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if (copy_to_user(buf, &event, event.header.size))
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return -EFAULT;
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return event.header.size;
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out:
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finish_wait(&ctx->wq, &wait);
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spin_unlock_irqrestore(&ctx->lock, flags);
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return rc;
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}
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/*
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* Note: if this is updated, we need to update api.c to patch the new ones in
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* too
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*/
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const struct file_operations afu_fops = {
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.owner = THIS_MODULE,
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.open = afu_open,
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.poll = afu_poll,
|
|
.read = afu_read,
|
|
.release = afu_release,
|
|
.unlocked_ioctl = afu_ioctl,
|
|
.compat_ioctl = afu_compat_ioctl,
|
|
.mmap = afu_mmap,
|
|
};
|
|
|
|
static const struct file_operations afu_master_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = afu_master_open,
|
|
.poll = afu_poll,
|
|
.read = afu_read,
|
|
.release = afu_release,
|
|
.unlocked_ioctl = afu_ioctl,
|
|
.compat_ioctl = afu_compat_ioctl,
|
|
.mmap = afu_mmap,
|
|
};
|
|
|
|
|
|
static char *cxl_devnode(struct device *dev, umode_t *mode)
|
|
{
|
|
if (cpu_has_feature(CPU_FTR_HVMODE) &&
|
|
CXL_DEVT_IS_CARD(dev->devt)) {
|
|
/*
|
|
* These minor numbers will eventually be used to program the
|
|
* PSL and AFUs once we have dynamic reprogramming support
|
|
*/
|
|
return NULL;
|
|
}
|
|
return kasprintf(GFP_KERNEL, "cxl/%s", dev_name(dev));
|
|
}
|
|
|
|
extern struct class *cxl_class;
|
|
|
|
static int cxl_add_chardev(struct cxl_afu *afu, dev_t devt, struct cdev *cdev,
|
|
struct device **chardev, char *postfix, char *desc,
|
|
const struct file_operations *fops)
|
|
{
|
|
struct device *dev;
|
|
int rc;
|
|
|
|
cdev_init(cdev, fops);
|
|
if ((rc = cdev_add(cdev, devt, 1))) {
|
|
dev_err(&afu->dev, "Unable to add %s chardev: %i\n", desc, rc);
|
|
return rc;
|
|
}
|
|
|
|
dev = device_create(cxl_class, &afu->dev, devt, afu,
|
|
"afu%i.%i%s", afu->adapter->adapter_num, afu->slice, postfix);
|
|
if (IS_ERR(dev)) {
|
|
dev_err(&afu->dev, "Unable to create %s chardev in sysfs: %i\n", desc, rc);
|
|
rc = PTR_ERR(dev);
|
|
goto err;
|
|
}
|
|
|
|
*chardev = dev;
|
|
|
|
return 0;
|
|
err:
|
|
cdev_del(cdev);
|
|
return rc;
|
|
}
|
|
|
|
int cxl_chardev_d_afu_add(struct cxl_afu *afu)
|
|
{
|
|
return cxl_add_chardev(afu, CXL_AFU_MKDEV_D(afu), &afu->afu_cdev_d,
|
|
&afu->chardev_d, "d", "dedicated",
|
|
&afu_master_fops); /* Uses master fops */
|
|
}
|
|
|
|
int cxl_chardev_m_afu_add(struct cxl_afu *afu)
|
|
{
|
|
return cxl_add_chardev(afu, CXL_AFU_MKDEV_M(afu), &afu->afu_cdev_m,
|
|
&afu->chardev_m, "m", "master",
|
|
&afu_master_fops);
|
|
}
|
|
|
|
int cxl_chardev_s_afu_add(struct cxl_afu *afu)
|
|
{
|
|
return cxl_add_chardev(afu, CXL_AFU_MKDEV_S(afu), &afu->afu_cdev_s,
|
|
&afu->chardev_s, "s", "shared",
|
|
&afu_fops);
|
|
}
|
|
|
|
void cxl_chardev_afu_remove(struct cxl_afu *afu)
|
|
{
|
|
if (afu->chardev_d) {
|
|
cdev_del(&afu->afu_cdev_d);
|
|
device_unregister(afu->chardev_d);
|
|
afu->chardev_d = NULL;
|
|
}
|
|
if (afu->chardev_m) {
|
|
cdev_del(&afu->afu_cdev_m);
|
|
device_unregister(afu->chardev_m);
|
|
afu->chardev_m = NULL;
|
|
}
|
|
if (afu->chardev_s) {
|
|
cdev_del(&afu->afu_cdev_s);
|
|
device_unregister(afu->chardev_s);
|
|
afu->chardev_s = NULL;
|
|
}
|
|
}
|
|
|
|
int cxl_register_afu(struct cxl_afu *afu)
|
|
{
|
|
afu->dev.class = cxl_class;
|
|
|
|
return device_register(&afu->dev);
|
|
}
|
|
|
|
int cxl_register_adapter(struct cxl *adapter)
|
|
{
|
|
adapter->dev.class = cxl_class;
|
|
|
|
/*
|
|
* Future: When we support dynamically reprogramming the PSL & AFU we
|
|
* will expose the interface to do that via a chardev:
|
|
* adapter->dev.devt = CXL_CARD_MKDEV(adapter);
|
|
*/
|
|
|
|
return device_register(&adapter->dev);
|
|
}
|
|
|
|
dev_t cxl_get_dev(void)
|
|
{
|
|
return cxl_dev;
|
|
}
|
|
|
|
int __init cxl_file_init(void)
|
|
{
|
|
int rc;
|
|
|
|
/*
|
|
* If these change we really need to update API. Either change some
|
|
* flags or update API version number CXL_API_VERSION.
|
|
*/
|
|
BUILD_BUG_ON(CXL_API_VERSION != 3);
|
|
BUILD_BUG_ON(sizeof(struct cxl_ioctl_start_work) != 64);
|
|
BUILD_BUG_ON(sizeof(struct cxl_event_header) != 8);
|
|
BUILD_BUG_ON(sizeof(struct cxl_event_afu_interrupt) != 8);
|
|
BUILD_BUG_ON(sizeof(struct cxl_event_data_storage) != 32);
|
|
BUILD_BUG_ON(sizeof(struct cxl_event_afu_error) != 16);
|
|
|
|
if ((rc = alloc_chrdev_region(&cxl_dev, 0, CXL_NUM_MINORS, "cxl"))) {
|
|
pr_err("Unable to allocate CXL major number: %i\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
pr_devel("CXL device allocated, MAJOR %i\n", MAJOR(cxl_dev));
|
|
|
|
cxl_class = class_create(THIS_MODULE, "cxl");
|
|
if (IS_ERR(cxl_class)) {
|
|
pr_err("Unable to create CXL class\n");
|
|
rc = PTR_ERR(cxl_class);
|
|
goto err;
|
|
}
|
|
cxl_class->devnode = cxl_devnode;
|
|
|
|
return 0;
|
|
|
|
err:
|
|
unregister_chrdev_region(cxl_dev, CXL_NUM_MINORS);
|
|
return rc;
|
|
}
|
|
|
|
void cxl_file_exit(void)
|
|
{
|
|
unregister_chrdev_region(cxl_dev, CXL_NUM_MINORS);
|
|
class_destroy(cxl_class);
|
|
}
|