mirror of https://gitee.com/openkylin/linux.git
489 lines
12 KiB
C
489 lines
12 KiB
C
/*
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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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* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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/smp_lock.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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#include "gru.h"
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#include "grulib.h"
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#include "grutables.h"
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#if defined CONFIG_X86_64
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#include <asm/genapic.h>
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#include <asm/irq.h>
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#define IS_UV() is_uv_system()
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#elif defined CONFIG_IA64
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#include <asm/system.h>
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#include <asm/sn/simulator.h>
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/* temp support for running on hardware simulator */
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#define IS_UV() IS_MEDUSA() || ia64_platform_is("uv")
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#else
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#define IS_UV() 0
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#endif
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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, gru_end_paddr __read_mostly;
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struct gru_stats_s gru_stats;
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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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static struct file_operations gru_fops;
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static struct miscdevice gru_miscdev;
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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 mmaping 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 |=
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(VM_IO | VM_DONTCOPY | VM_LOCKED | VM_DONTEXPAND | VM_PFNMAP |
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VM_RESERVED);
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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 == 0 ||
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req.data_segment_bytes > max_user_dsr_bytes)
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return -EINVAL;
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if (!req.control_blocks || !req.maximum_thread_count ||
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req.control_blocks > max_user_cbrs)
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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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down_write(¤t->mm->mmap_sem);
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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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ret = 0;
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}
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up_write(¤t->mm->mmap_sem);
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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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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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* Get GRU chiplet status
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*/
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static long gru_get_chiplet_status(unsigned long arg)
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{
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struct gru_state *gru;
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struct gru_chiplet_info info;
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if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
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return -EFAULT;
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if (info.node == -1)
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info.node = numa_node_id();
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if (info.node >= num_possible_nodes() ||
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info.chiplet >= GRU_CHIPLETS_PER_HUB ||
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info.node < 0 || info.chiplet < 0)
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return -EINVAL;
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info.blade = uv_node_to_blade_id(info.node);
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gru = get_gru(info.blade, info.chiplet);
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info.total_dsr_bytes = GRU_NUM_DSR_BYTES;
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info.total_cbr = GRU_NUM_CB;
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info.total_user_dsr_bytes = GRU_NUM_DSR_BYTES -
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gru->gs_reserved_dsr_bytes;
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info.total_user_cbr = GRU_NUM_CB - gru->gs_reserved_cbrs;
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info.free_user_dsr_bytes = hweight64(gru->gs_dsr_map) *
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GRU_DSR_AU_BYTES;
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info.free_user_cbr = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
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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\n", file);
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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_TASK_SLICE:
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err = gru_set_task_slice(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_GET_CHIPLET_STATUS:
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err = gru_get_chiplet_status(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_CONFIG_INFO:
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err = gru_get_config_info(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 nid, int bid, int grunum)
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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 = bid * GRU_CHIPLETS_PER_BLADE + grunum;
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gru->gs_blade = gru_base[bid];
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gru->gs_blade_id = bid;
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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_tgh_flush_init(gru);
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gru_dbg(grudev, "bid %d, nid %d, gru %x, vaddr %p (0x%lx)\n",
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bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr,
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gru->gs_gru_base_paddr);
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gru_kservices_init(gru);
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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_online_node(nid) {
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bid = uv_node_to_blade_id(nid);
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pnode = uv_node_to_pnode(nid);
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if (gru_base[bid])
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continue;
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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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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, nid, 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 (nid--; nid >= 0; nid--)
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free_pages((unsigned long)gru_base[nid], order);
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return -ENOMEM;
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}
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#ifdef CONFIG_IA64
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static int get_base_irq(void)
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{
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return IRQ_GRU;
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}
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#elif defined CONFIG_X86_64
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static void noop(unsigned int irq)
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{
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}
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static struct irq_chip gru_chip = {
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.name = "gru",
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.mask = noop,
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.unmask = noop,
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.ack = noop,
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};
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static int get_base_irq(void)
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{
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set_irq_chip(IRQ_GRU, &gru_chip);
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set_irq_chip(IRQ_GRU + 1, &gru_chip);
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return IRQ_GRU;
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}
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#endif
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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, irq, chip;
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char id[10];
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void *gru_start_vaddr;
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if (!IS_UV())
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return 0;
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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_MMR) &
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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 + MAX_NUMNODES * 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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irq = get_base_irq();
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for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) {
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ret = request_irq(irq + chip, gru_intr, 0, id, NULL);
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if (ret) {
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printk(KERN_ERR "%s: request_irq failed\n",
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GRU_DRIVER_ID_STR);
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goto exit1;
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}
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}
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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 exit1;
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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 exit2;
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}
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ret = gru_init_tables(gru_start_paddr, gru_start_vaddr);
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if (ret) {
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printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR);
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goto exit3;
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}
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printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
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GRU_DRIVER_VERSION_STR);
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return 0;
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exit3:
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gru_proc_exit();
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exit2:
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misc_deregister(&gru_miscdev);
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exit1:
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for (--chip; chip >= 0; chip--)
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free_irq(irq + chip, NULL);
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return ret;
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}
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static void __exit gru_exit(void)
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{
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int i, 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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if (!IS_UV())
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return;
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for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
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free_irq(IRQ_GRU + i, NULL);
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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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misc_deregister(&gru_miscdev);
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gru_proc_exit();
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}
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static struct file_operations gru_fops = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = gru_file_unlocked_ioctl,
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.mmap = gru_file_mmap,
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};
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static struct miscdevice gru_miscdev = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "gru",
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.fops = &gru_fops,
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};
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struct vm_operations_struct gru_vm_ops = {
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.close = gru_vma_close,
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.fault = gru_fault,
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};
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module_init(gru_init);
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module_exit(gru_exit);
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module_param(gru_options, ulong, 0644);
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MODULE_PARM_DESC(gru_options, "Various debug options");
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MODULE_AUTHOR("Silicon Graphics, Inc.");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
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MODULE_VERSION(GRU_DRIVER_VERSION_STR);
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