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699 lines
17 KiB
699 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright 2014 IBM Corp. |
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*/ |
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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 <linux/sched/mm.h> |
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#include <linux/mmu_context.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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/* 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, sizeof(work))) |
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return -EFAULT; |
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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 || |
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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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if (work.flags & CXL_START_WORK_TID) |
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ctx->assign_tidr = true; |
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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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/* acquire a reference to the task's mm */ |
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ctx->mm = get_task_mm(current); |
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/* ensure this mm_struct can't be freed */ |
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cxl_context_mm_count_get(ctx); |
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if (ctx->mm) { |
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/* decrement the use count from above */ |
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mmput(ctx->mm); |
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/* make TLBIs for this context global */ |
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mm_context_add_copro(ctx->mm); |
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} |
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/* |
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* Increment driver use count. Enables global TLBIs for hash |
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* and callbacks to handle the segment table |
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*/ |
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cxl_ctx_get(); |
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/* |
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* A barrier is needed to make sure all TLBIs are global |
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* before we attach and the context starts being used by the |
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* adapter. |
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* |
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* Needed after mm_context_add_copro() for radix and |
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* cxl_ctx_get() for hash/p8. |
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* |
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* The barrier should really be mb(), since it involves a |
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* device. However, it's only useful when we have local |
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* vs. global TLBIs, i.e SMP=y. So keep smp_mb(). |
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*/ |
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smp_mb(); |
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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->pid); |
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ctx->pid = NULL; |
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cxl_ctx_put(); |
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cxl_context_mm_count_put(ctx); |
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if (ctx->mm) |
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mm_context_remove_copro(ctx->mm); |
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goto out; |
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} |
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rc = 0; |
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if (work.flags & CXL_START_WORK_TID) { |
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work.tid = ctx->tidr; |
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if (copy_to_user(uwork, &work, sizeof(work))) |
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rc = -EFAULT; |
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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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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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__poll_t 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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__poll_t 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 |= EPOLLIN | EPOLLRDNORM; |
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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 |= EPOLLERR; |
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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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|
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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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|
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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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/* |
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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, |
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.read = afu_read, |
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.release = afu_release, |
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.unlocked_ioctl = afu_ioctl, |
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.compat_ioctl = afu_compat_ioctl, |
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.mmap = afu_mmap, |
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}; |
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static const struct file_operations afu_master_fops = { |
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.owner = THIS_MODULE, |
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.open = afu_master_open, |
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.poll = afu_poll, |
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.read = afu_read, |
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.release = afu_release, |
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.unlocked_ioctl = afu_ioctl, |
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.compat_ioctl = afu_compat_ioctl, |
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.mmap = afu_mmap, |
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}; |
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|
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static char *cxl_devnode(struct device *dev, umode_t *mode) |
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{ |
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if (cpu_has_feature(CPU_FTR_HVMODE) && |
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CXL_DEVT_IS_CARD(dev->devt)) { |
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/* |
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* 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); |
|
}
|
|
|