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612 lines
14 KiB
612 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* SN Platform GRU Driver |
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* |
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* FILE OPERATIONS & DRIVER INITIALIZATION |
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* |
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* This file supports the user system call for file open, close, mmap, etc. |
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* This also incudes the driver initialization code. |
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* |
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* (C) Copyright 2020 Hewlett Packard Enterprise Development LP |
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* Copyright (c) 2008-2014 Silicon Graphics, Inc. All Rights Reserved. |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/slab.h> |
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#include <linux/mm.h> |
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#include <linux/io.h> |
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#include <linux/spinlock.h> |
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#include <linux/device.h> |
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#include <linux/miscdevice.h> |
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#include <linux/interrupt.h> |
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#include <linux/proc_fs.h> |
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#include <linux/uaccess.h> |
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#ifdef CONFIG_X86_64 |
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#include <asm/uv/uv_irq.h> |
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#endif |
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#include <asm/uv/uv.h> |
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#include "gru.h" |
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#include "grulib.h" |
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#include "grutables.h" |
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#include <asm/uv/uv_hub.h> |
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#include <asm/uv/uv_mmrs.h> |
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struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly; |
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unsigned long gru_start_paddr __read_mostly; |
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void *gru_start_vaddr __read_mostly; |
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unsigned long gru_end_paddr __read_mostly; |
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unsigned int gru_max_gids __read_mostly; |
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struct gru_stats_s gru_stats; |
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|
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/* Guaranteed user available resources on each node */ |
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static int max_user_cbrs, max_user_dsr_bytes; |
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|
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static struct miscdevice gru_miscdev; |
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static int gru_supported(void) |
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{ |
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return is_uv_system() && |
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(uv_hub_info->hub_revision < UV3_HUB_REVISION_BASE); |
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} |
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/* |
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* gru_vma_close |
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* |
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* Called when unmapping a device mapping. Frees all gru resources |
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* and tables belonging to the vma. |
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*/ |
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static void gru_vma_close(struct vm_area_struct *vma) |
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{ |
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struct gru_vma_data *vdata; |
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struct gru_thread_state *gts; |
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struct list_head *entry, *next; |
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if (!vma->vm_private_data) |
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return; |
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vdata = vma->vm_private_data; |
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vma->vm_private_data = NULL; |
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gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file, |
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vdata); |
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list_for_each_safe(entry, next, &vdata->vd_head) { |
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gts = |
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list_entry(entry, struct gru_thread_state, ts_next); |
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list_del(>s->ts_next); |
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mutex_lock(>s->ts_ctxlock); |
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if (gts->ts_gru) |
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gru_unload_context(gts, 0); |
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mutex_unlock(>s->ts_ctxlock); |
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gts_drop(gts); |
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} |
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kfree(vdata); |
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STAT(vdata_free); |
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} |
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/* |
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* gru_file_mmap |
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* |
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* Called when mmapping the device. Initializes the vma with a fault handler |
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* and private data structure necessary to allocate, track, and free the |
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* underlying pages. |
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*/ |
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static int gru_file_mmap(struct file *file, struct vm_area_struct *vma) |
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{ |
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if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE)) |
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return -EPERM; |
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if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) || |
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vma->vm_end & (GRU_GSEG_PAGESIZE - 1)) |
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return -EINVAL; |
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vma->vm_flags |= VM_IO | VM_PFNMAP | VM_LOCKED | |
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VM_DONTCOPY | VM_DONTEXPAND | VM_DONTDUMP; |
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vma->vm_page_prot = PAGE_SHARED; |
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vma->vm_ops = &gru_vm_ops; |
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vma->vm_private_data = gru_alloc_vma_data(vma, 0); |
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if (!vma->vm_private_data) |
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return -ENOMEM; |
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gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n", |
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file, vma->vm_start, vma, vma->vm_private_data); |
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return 0; |
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} |
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/* |
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* Create a new GRU context |
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*/ |
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static int gru_create_new_context(unsigned long arg) |
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{ |
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struct gru_create_context_req req; |
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struct vm_area_struct *vma; |
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struct gru_vma_data *vdata; |
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int ret = -EINVAL; |
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if (copy_from_user(&req, (void __user *)arg, sizeof(req))) |
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return -EFAULT; |
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if (req.data_segment_bytes > max_user_dsr_bytes) |
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return -EINVAL; |
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if (req.control_blocks > max_user_cbrs || !req.maximum_thread_count) |
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return -EINVAL; |
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if (!(req.options & GRU_OPT_MISS_MASK)) |
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req.options |= GRU_OPT_MISS_FMM_INTR; |
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mmap_write_lock(current->mm); |
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vma = gru_find_vma(req.gseg); |
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if (vma) { |
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vdata = vma->vm_private_data; |
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vdata->vd_user_options = req.options; |
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vdata->vd_dsr_au_count = |
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GRU_DS_BYTES_TO_AU(req.data_segment_bytes); |
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vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks); |
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vdata->vd_tlb_preload_count = req.tlb_preload_count; |
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ret = 0; |
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} |
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mmap_write_unlock(current->mm); |
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return ret; |
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} |
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/* |
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* Get GRU configuration info (temp - for emulator testing) |
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*/ |
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static long gru_get_config_info(unsigned long arg) |
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{ |
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struct gru_config_info info; |
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int nodesperblade; |
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if (num_online_nodes() > 1 && |
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(uv_node_to_blade_id(1) == uv_node_to_blade_id(0))) |
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nodesperblade = 2; |
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else |
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nodesperblade = 1; |
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memset(&info, 0, sizeof(info)); |
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info.cpus = num_online_cpus(); |
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info.nodes = num_online_nodes(); |
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info.blades = info.nodes / nodesperblade; |
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info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades; |
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if (copy_to_user((void __user *)arg, &info, sizeof(info))) |
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return -EFAULT; |
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return 0; |
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} |
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/* |
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* gru_file_unlocked_ioctl |
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* |
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* Called to update file attributes via IOCTL calls. |
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*/ |
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static long gru_file_unlocked_ioctl(struct file *file, unsigned int req, |
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unsigned long arg) |
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{ |
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int err = -EBADRQC; |
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gru_dbg(grudev, "file %p, req 0x%x, 0x%lx\n", file, req, arg); |
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switch (req) { |
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case GRU_CREATE_CONTEXT: |
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err = gru_create_new_context(arg); |
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break; |
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case GRU_SET_CONTEXT_OPTION: |
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err = gru_set_context_option(arg); |
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break; |
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case GRU_USER_GET_EXCEPTION_DETAIL: |
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err = gru_get_exception_detail(arg); |
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break; |
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case GRU_USER_UNLOAD_CONTEXT: |
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err = gru_user_unload_context(arg); |
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break; |
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case GRU_USER_FLUSH_TLB: |
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err = gru_user_flush_tlb(arg); |
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break; |
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case GRU_USER_CALL_OS: |
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err = gru_handle_user_call_os(arg); |
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break; |
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case GRU_GET_GSEG_STATISTICS: |
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err = gru_get_gseg_statistics(arg); |
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break; |
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case GRU_KTEST: |
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err = gru_ktest(arg); |
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break; |
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case GRU_GET_CONFIG_INFO: |
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err = gru_get_config_info(arg); |
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break; |
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case GRU_DUMP_CHIPLET_STATE: |
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err = gru_dump_chiplet_request(arg); |
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break; |
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} |
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return err; |
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} |
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/* |
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* Called at init time to build tables for all GRUs that are present in the |
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* system. |
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*/ |
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static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr, |
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void *vaddr, int blade_id, int chiplet_id) |
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{ |
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spin_lock_init(&gru->gs_lock); |
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spin_lock_init(&gru->gs_asid_lock); |
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gru->gs_gru_base_paddr = paddr; |
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gru->gs_gru_base_vaddr = vaddr; |
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gru->gs_gid = blade_id * GRU_CHIPLETS_PER_BLADE + chiplet_id; |
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gru->gs_blade = gru_base[blade_id]; |
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gru->gs_blade_id = blade_id; |
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gru->gs_chiplet_id = chiplet_id; |
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gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1; |
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gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1; |
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gru->gs_asid_limit = MAX_ASID; |
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gru_tgh_flush_init(gru); |
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if (gru->gs_gid >= gru_max_gids) |
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gru_max_gids = gru->gs_gid + 1; |
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gru_dbg(grudev, "bid %d, gid %d, vaddr %p (0x%lx)\n", |
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blade_id, gru->gs_gid, gru->gs_gru_base_vaddr, |
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gru->gs_gru_base_paddr); |
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} |
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static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr) |
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{ |
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int pnode, nid, bid, chip; |
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int cbrs, dsrbytes, n; |
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int order = get_order(sizeof(struct gru_blade_state)); |
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struct page *page; |
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struct gru_state *gru; |
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unsigned long paddr; |
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void *vaddr; |
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max_user_cbrs = GRU_NUM_CB; |
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max_user_dsr_bytes = GRU_NUM_DSR_BYTES; |
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for_each_possible_blade(bid) { |
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pnode = uv_blade_to_pnode(bid); |
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nid = uv_blade_to_memory_nid(bid);/* -1 if no memory on blade */ |
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page = alloc_pages_node(nid, GFP_KERNEL, order); |
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if (!page) |
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goto fail; |
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gru_base[bid] = page_address(page); |
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memset(gru_base[bid], 0, sizeof(struct gru_blade_state)); |
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gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0]; |
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spin_lock_init(&gru_base[bid]->bs_lock); |
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init_rwsem(&gru_base[bid]->bs_kgts_sema); |
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dsrbytes = 0; |
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cbrs = 0; |
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for (gru = gru_base[bid]->bs_grus, chip = 0; |
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chip < GRU_CHIPLETS_PER_BLADE; |
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chip++, gru++) { |
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paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip); |
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vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip); |
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gru_init_chiplet(gru, paddr, vaddr, bid, chip); |
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n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE; |
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cbrs = max(cbrs, n); |
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n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES; |
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dsrbytes = max(dsrbytes, n); |
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} |
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max_user_cbrs = min(max_user_cbrs, cbrs); |
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max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes); |
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} |
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return 0; |
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fail: |
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for (bid--; bid >= 0; bid--) |
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free_pages((unsigned long)gru_base[bid], order); |
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return -ENOMEM; |
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} |
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static void gru_free_tables(void) |
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{ |
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int bid; |
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int order = get_order(sizeof(struct gru_state) * |
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GRU_CHIPLETS_PER_BLADE); |
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for (bid = 0; bid < GRU_MAX_BLADES; bid++) |
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free_pages((unsigned long)gru_base[bid], order); |
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} |
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static unsigned long gru_chiplet_cpu_to_mmr(int chiplet, int cpu, int *corep) |
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{ |
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unsigned long mmr = 0; |
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int core; |
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/* |
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* We target the cores of a blade and not the hyperthreads themselves. |
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* There is a max of 8 cores per socket and 2 sockets per blade, |
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* making for a max total of 16 cores (i.e., 16 CPUs without |
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* hyperthreading and 32 CPUs with hyperthreading). |
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*/ |
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core = uv_cpu_core_number(cpu) + UV_MAX_INT_CORES * uv_cpu_socket_number(cpu); |
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if (core >= GRU_NUM_TFM || uv_cpu_ht_number(cpu)) |
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return 0; |
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if (chiplet == 0) { |
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mmr = UVH_GR0_TLB_INT0_CONFIG + |
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core * (UVH_GR0_TLB_INT1_CONFIG - UVH_GR0_TLB_INT0_CONFIG); |
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} else if (chiplet == 1) { |
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mmr = UVH_GR1_TLB_INT0_CONFIG + |
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core * (UVH_GR1_TLB_INT1_CONFIG - UVH_GR1_TLB_INT0_CONFIG); |
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} else { |
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BUG(); |
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} |
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*corep = core; |
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return mmr; |
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} |
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#ifdef CONFIG_IA64 |
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static int gru_irq_count[GRU_CHIPLETS_PER_BLADE]; |
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static void gru_noop(struct irq_data *d) |
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{ |
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} |
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static struct irq_chip gru_chip[GRU_CHIPLETS_PER_BLADE] = { |
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[0 ... GRU_CHIPLETS_PER_BLADE - 1] { |
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.irq_mask = gru_noop, |
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.irq_unmask = gru_noop, |
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.irq_ack = gru_noop |
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} |
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}; |
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static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name, |
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irq_handler_t irq_handler, int cpu, int blade) |
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{ |
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unsigned long mmr; |
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int irq = IRQ_GRU + chiplet; |
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int ret, core; |
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mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); |
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if (mmr == 0) |
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return 0; |
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if (gru_irq_count[chiplet] == 0) { |
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gru_chip[chiplet].name = irq_name; |
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ret = irq_set_chip(irq, &gru_chip[chiplet]); |
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if (ret) { |
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printk(KERN_ERR "%s: set_irq_chip failed, errno=%d\n", |
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GRU_DRIVER_ID_STR, -ret); |
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return ret; |
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} |
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ret = request_irq(irq, irq_handler, 0, irq_name, NULL); |
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if (ret) { |
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printk(KERN_ERR "%s: request_irq failed, errno=%d\n", |
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GRU_DRIVER_ID_STR, -ret); |
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return ret; |
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} |
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} |
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gru_irq_count[chiplet]++; |
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return 0; |
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} |
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static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade) |
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{ |
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unsigned long mmr; |
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int core, irq = IRQ_GRU + chiplet; |
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if (gru_irq_count[chiplet] == 0) |
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return; |
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mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); |
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if (mmr == 0) |
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return; |
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if (--gru_irq_count[chiplet] == 0) |
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free_irq(irq, NULL); |
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} |
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#elif defined CONFIG_X86_64 |
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static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name, |
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irq_handler_t irq_handler, int cpu, int blade) |
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{ |
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unsigned long mmr; |
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int irq, core; |
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int ret; |
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mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); |
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if (mmr == 0) |
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return 0; |
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irq = uv_setup_irq(irq_name, cpu, blade, mmr, UV_AFFINITY_CPU); |
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if (irq < 0) { |
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printk(KERN_ERR "%s: uv_setup_irq failed, errno=%d\n", |
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GRU_DRIVER_ID_STR, -irq); |
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return irq; |
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} |
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ret = request_irq(irq, irq_handler, 0, irq_name, NULL); |
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if (ret) { |
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uv_teardown_irq(irq); |
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printk(KERN_ERR "%s: request_irq failed, errno=%d\n", |
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GRU_DRIVER_ID_STR, -ret); |
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return ret; |
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} |
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gru_base[blade]->bs_grus[chiplet].gs_irq[core] = irq; |
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return 0; |
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} |
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static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade) |
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{ |
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int irq, core; |
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unsigned long mmr; |
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mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); |
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if (mmr) { |
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irq = gru_base[blade]->bs_grus[chiplet].gs_irq[core]; |
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if (irq) { |
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free_irq(irq, NULL); |
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uv_teardown_irq(irq); |
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} |
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} |
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} |
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#endif |
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static void gru_teardown_tlb_irqs(void) |
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{ |
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int blade; |
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int cpu; |
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for_each_online_cpu(cpu) { |
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blade = uv_cpu_to_blade_id(cpu); |
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gru_chiplet_teardown_tlb_irq(0, cpu, blade); |
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gru_chiplet_teardown_tlb_irq(1, cpu, blade); |
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} |
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for_each_possible_blade(blade) { |
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if (uv_blade_nr_possible_cpus(blade)) |
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continue; |
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gru_chiplet_teardown_tlb_irq(0, 0, blade); |
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gru_chiplet_teardown_tlb_irq(1, 0, blade); |
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} |
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} |
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static int gru_setup_tlb_irqs(void) |
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{ |
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int blade; |
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int cpu; |
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int ret; |
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for_each_online_cpu(cpu) { |
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blade = uv_cpu_to_blade_id(cpu); |
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ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru0_intr, cpu, blade); |
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if (ret != 0) |
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goto exit1; |
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ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru1_intr, cpu, blade); |
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if (ret != 0) |
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goto exit1; |
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} |
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for_each_possible_blade(blade) { |
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if (uv_blade_nr_possible_cpus(blade)) |
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continue; |
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ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru_intr_mblade, 0, blade); |
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if (ret != 0) |
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goto exit1; |
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ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru_intr_mblade, 0, blade); |
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if (ret != 0) |
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goto exit1; |
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} |
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return 0; |
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exit1: |
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gru_teardown_tlb_irqs(); |
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return ret; |
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} |
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|
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/* |
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* gru_init |
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* |
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* Called at boot or module load time to initialize the GRUs. |
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*/ |
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static int __init gru_init(void) |
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{ |
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int ret; |
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|
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if (!gru_supported()) |
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return 0; |
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|
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#if defined CONFIG_IA64 |
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gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */ |
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#else |
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gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG) & |
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0x7fffffffffffUL; |
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#endif |
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gru_start_vaddr = __va(gru_start_paddr); |
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gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE; |
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printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n", |
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gru_start_paddr, gru_end_paddr); |
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ret = misc_register(&gru_miscdev); |
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if (ret) { |
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printk(KERN_ERR "%s: misc_register failed\n", |
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GRU_DRIVER_ID_STR); |
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goto exit0; |
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} |
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ret = gru_proc_init(); |
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if (ret) { |
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printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR); |
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goto exit1; |
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} |
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|
|
ret = gru_init_tables(gru_start_paddr, gru_start_vaddr); |
|
if (ret) { |
|
printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR); |
|
goto exit2; |
|
} |
|
|
|
ret = gru_setup_tlb_irqs(); |
|
if (ret != 0) |
|
goto exit3; |
|
|
|
gru_kservices_init(); |
|
|
|
printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR, |
|
GRU_DRIVER_VERSION_STR); |
|
return 0; |
|
|
|
exit3: |
|
gru_free_tables(); |
|
exit2: |
|
gru_proc_exit(); |
|
exit1: |
|
misc_deregister(&gru_miscdev); |
|
exit0: |
|
return ret; |
|
|
|
} |
|
|
|
static void __exit gru_exit(void) |
|
{ |
|
if (!gru_supported()) |
|
return; |
|
|
|
gru_teardown_tlb_irqs(); |
|
gru_kservices_exit(); |
|
gru_free_tables(); |
|
misc_deregister(&gru_miscdev); |
|
gru_proc_exit(); |
|
mmu_notifier_synchronize(); |
|
} |
|
|
|
static const struct file_operations gru_fops = { |
|
.owner = THIS_MODULE, |
|
.unlocked_ioctl = gru_file_unlocked_ioctl, |
|
.mmap = gru_file_mmap, |
|
.llseek = noop_llseek, |
|
}; |
|
|
|
static struct miscdevice gru_miscdev = { |
|
.minor = MISC_DYNAMIC_MINOR, |
|
.name = "gru", |
|
.fops = &gru_fops, |
|
}; |
|
|
|
const struct vm_operations_struct gru_vm_ops = { |
|
.close = gru_vma_close, |
|
.fault = gru_fault, |
|
}; |
|
|
|
#ifndef MODULE |
|
fs_initcall(gru_init); |
|
#else |
|
module_init(gru_init); |
|
#endif |
|
module_exit(gru_exit); |
|
|
|
module_param(gru_options, ulong, 0644); |
|
MODULE_PARM_DESC(gru_options, "Various debug options"); |
|
|
|
MODULE_AUTHOR("Silicon Graphics, Inc."); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR); |
|
MODULE_VERSION(GRU_DRIVER_VERSION_STR); |
|
|
|
|