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![Konstantin Khlebnikov](/assets/img/avatar_default.png)
A long time ago, in v2.4, VM_RESERVED kept swapout process off VMA, currently it lost original meaning but still has some effects: | effect | alternative flags -+------------------------+--------------------------------------------- 1| account as reserved_vm | VM_IO 2| skip in core dump | VM_IO, VM_DONTDUMP 3| do not merge or expand | VM_IO, VM_DONTEXPAND, VM_HUGETLB, VM_PFNMAP 4| do not mlock | VM_IO, VM_DONTEXPAND, VM_HUGETLB, VM_PFNMAP This patch removes reserved_vm counter from mm_struct. Seems like nobody cares about it, it does not exported into userspace directly, it only reduces total_vm showed in proc. Thus VM_RESERVED can be replaced with VM_IO or pair VM_DONTEXPAND | VM_DONTDUMP. remap_pfn_range() and io_remap_pfn_range() set VM_IO|VM_DONTEXPAND|VM_DONTDUMP. remap_vmalloc_range() set VM_DONTEXPAND | VM_DONTDUMP. [akpm@linux-foundation.org: drivers/vfio/pci/vfio_pci.c fixup] Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Carsten Otte <cotte@de.ibm.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Eric Paris <eparis@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Hugh Dickins <hughd@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Morris <james.l.morris@oracle.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Kentaro Takeda <takedakn@nttdata.co.jp> Cc: Matt Helsley <matthltc@us.ibm.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Robert Richter <robert.richter@amd.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Venkatesh Pallipadi <venki@google.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
617 lines
15 KiB
C
617 lines
15 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/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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/* 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 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 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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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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vdata->vd_tlb_preload_count = req.tlb_preload_count;
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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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* 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);
|
|
printk(KERN_ERR "%s: request_irq failed, errno=%d\n",
|
|
GRU_DRIVER_ID_STR, -ret);
|
|
return ret;
|
|
}
|
|
gru_base[blade]->bs_grus[chiplet].gs_irq[core] = irq;
|
|
return 0;
|
|
}
|
|
|
|
static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade)
|
|
{
|
|
int irq, core;
|
|
unsigned long mmr;
|
|
|
|
mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
|
|
if (mmr) {
|
|
irq = gru_base[blade]->bs_grus[chiplet].gs_irq[core];
|
|
if (irq) {
|
|
free_irq(irq, NULL);
|
|
uv_teardown_irq(irq);
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
static void gru_teardown_tlb_irqs(void)
|
|
{
|
|
int blade;
|
|
int cpu;
|
|
|
|
for_each_online_cpu(cpu) {
|
|
blade = uv_cpu_to_blade_id(cpu);
|
|
gru_chiplet_teardown_tlb_irq(0, cpu, blade);
|
|
gru_chiplet_teardown_tlb_irq(1, cpu, blade);
|
|
}
|
|
for_each_possible_blade(blade) {
|
|
if (uv_blade_nr_possible_cpus(blade))
|
|
continue;
|
|
gru_chiplet_teardown_tlb_irq(0, 0, blade);
|
|
gru_chiplet_teardown_tlb_irq(1, 0, blade);
|
|
}
|
|
}
|
|
|
|
static int gru_setup_tlb_irqs(void)
|
|
{
|
|
int blade;
|
|
int cpu;
|
|
int ret;
|
|
|
|
for_each_online_cpu(cpu) {
|
|
blade = uv_cpu_to_blade_id(cpu);
|
|
ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru0_intr, cpu, blade);
|
|
if (ret != 0)
|
|
goto exit1;
|
|
|
|
ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru1_intr, cpu, blade);
|
|
if (ret != 0)
|
|
goto exit1;
|
|
}
|
|
for_each_possible_blade(blade) {
|
|
if (uv_blade_nr_possible_cpus(blade))
|
|
continue;
|
|
ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru_intr_mblade, 0, blade);
|
|
if (ret != 0)
|
|
goto exit1;
|
|
|
|
ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru_intr_mblade, 0, blade);
|
|
if (ret != 0)
|
|
goto exit1;
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit1:
|
|
gru_teardown_tlb_irqs();
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* gru_init
|
|
*
|
|
* Called at boot or module load time to initialize the GRUs.
|
|
*/
|
|
static int __init gru_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (!is_uv_system())
|
|
return 0;
|
|
|
|
#if defined CONFIG_IA64
|
|
gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */
|
|
#else
|
|
gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) &
|
|
0x7fffffffffffUL;
|
|
#endif
|
|
gru_start_vaddr = __va(gru_start_paddr);
|
|
gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE;
|
|
printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n",
|
|
gru_start_paddr, gru_end_paddr);
|
|
ret = misc_register(&gru_miscdev);
|
|
if (ret) {
|
|
printk(KERN_ERR "%s: misc_register failed\n",
|
|
GRU_DRIVER_ID_STR);
|
|
goto exit0;
|
|
}
|
|
|
|
ret = gru_proc_init();
|
|
if (ret) {
|
|
printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
|
|
goto exit1;
|
|
}
|
|
|
|
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 (!is_uv_system())
|
|
return;
|
|
|
|
gru_teardown_tlb_irqs();
|
|
gru_kservices_exit();
|
|
gru_free_tables();
|
|
misc_deregister(&gru_miscdev);
|
|
gru_proc_exit();
|
|
}
|
|
|
|
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);
|
|
|