drivers/misc/sgi-gru/grufile.c - kernel/msm-4.9 - Gitiles

 /*
  * SN Platform GRU Driver
  *
  *              FILE OPERATIONS & DRIVER INITIALIZATION
  *
  * This file supports the user system call for file open, close, mmap, etc.
  * This also incudes the driver initialization code.
  *
  *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/io.h>
 #include <linux/smp_lock.h>
 #include <linux/spinlock.h>
 #include <linux/device.h>
 #include <linux/miscdevice.h>
 #include <linux/interrupt.h>
 #include <linux/proc_fs.h>
 #include <linux/uaccess.h>
 #include <asm/uv/uv.h>
 #include "gru.h"
 #include "grulib.h"
 #include "grutables.h"

 #include <asm/uv/uv_hub.h>
 #include <asm/uv/uv_mmrs.h>

 struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly;
 unsigned long gru_start_paddr __read_mostly;
 unsigned long gru_end_paddr __read_mostly;
 unsigned int gru_max_gids __read_mostly;
 struct gru_stats_s gru_stats;

 /* Guaranteed user available resources on each node */
 static int max_user_cbrs, max_user_dsr_bytes;

 static struct file_operations gru_fops;
 static struct miscdevice gru_miscdev;


 /*
  * gru_vma_close
  *
  * Called when unmapping a device mapping. Frees all gru resources
  * and tables belonging to the vma.
  */
 static void gru_vma_close(struct vm_area_struct *vma)
 {
 	struct gru_vma_data *vdata;
 	struct gru_thread_state *gts;
 	struct list_head *entry, *next;

 	if (!vma->vm_private_data)
 		return;

 	vdata = vma->vm_private_data;
 	vma->vm_private_data = NULL;
 	gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file,
 				vdata);
 	list_for_each_safe(entry, next, &vdata->vd_head) {
 		gts =
 		    list_entry(entry, struct gru_thread_state, ts_next);
 		list_del(&gts->ts_next);
 		mutex_lock(&gts->ts_ctxlock);
 		if (gts->ts_gru)
 			gru_unload_context(gts, 0);
 		mutex_unlock(&gts->ts_ctxlock);
 		gts_drop(gts);
 	}
 	kfree(vdata);
 	STAT(vdata_free);
 }

 /*
  * gru_file_mmap
  *
  * Called when mmaping the device.  Initializes the vma with a fault handler
  * and private data structure necessary to allocate, track, and free the
  * underlying pages.
  */
 static int gru_file_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE))
 		return -EPERM;

 	if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) ||
 				vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
 		return -EINVAL;

 	vma->vm_flags |=
 	    (VM_IO | VM_DONTCOPY | VM_LOCKED | VM_DONTEXPAND | VM_PFNMAP |
 			VM_RESERVED);
 	vma->vm_page_prot = PAGE_SHARED;
 	vma->vm_ops = &gru_vm_ops;

 	vma->vm_private_data = gru_alloc_vma_data(vma, 0);
 	if (!vma->vm_private_data)
 		return -ENOMEM;

 	gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n",
 		file, vma->vm_start, vma, vma->vm_private_data);
 	return 0;
 }

 /*
  * Create a new GRU context
  */
 static int gru_create_new_context(unsigned long arg)
 {
 	struct gru_create_context_req req;
 	struct vm_area_struct *vma;
 	struct gru_vma_data *vdata;
 	int ret = -EINVAL;


 	if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
 		return -EFAULT;

 	if (req.data_segment_bytes == 0 ||
 				req.data_segment_bytes > max_user_dsr_bytes)
 		return -EINVAL;
 	if (!req.control_blocks || !req.maximum_thread_count ||
 				req.control_blocks > max_user_cbrs)
 		return -EINVAL;

 	if (!(req.options & GRU_OPT_MISS_MASK))
 		req.options |= GRU_OPT_MISS_FMM_INTR;

 	down_write(&current->mm->mmap_sem);
 	vma = gru_find_vma(req.gseg);
 	if (vma) {
 		vdata = vma->vm_private_data;
 		vdata->vd_user_options = req.options;
 		vdata->vd_dsr_au_count =
 		    GRU_DS_BYTES_TO_AU(req.data_segment_bytes);
 		vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks);
 		ret = 0;
 	}
 	up_write(&current->mm->mmap_sem);

 	return ret;
 }

 /*
  * Get GRU configuration info (temp - for emulator testing)
  */
 static long gru_get_config_info(unsigned long arg)
 {
 	struct gru_config_info info;
 	int nodesperblade;

 	if (num_online_nodes() > 1 &&
 			(uv_node_to_blade_id(1) == uv_node_to_blade_id(0)))
 		nodesperblade = 2;
 	else
 		nodesperblade = 1;
 	info.cpus = num_online_cpus();
 	info.nodes = num_online_nodes();
 	info.blades = info.nodes / nodesperblade;
 	info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades;

 	if (copy_to_user((void __user *)arg, &info, sizeof(info)))
 		return -EFAULT;
 	return 0;
 }

 /*
  * Get GRU chiplet status
  */
 static long gru_get_chiplet_status(unsigned long arg)
 {
 	struct gru_state *gru;
 	struct gru_chiplet_info info;

 	if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
 		return -EFAULT;

 	if (info.node == -1)
 		info.node = numa_node_id();
 	if (info.node >= num_possible_nodes() ||
 			info.chiplet >= GRU_CHIPLETS_PER_HUB ||
 			info.node < 0 || info.chiplet < 0)
 		return -EINVAL;

 	info.blade = uv_node_to_blade_id(info.node);
 	gru = get_gru(info.blade, info.chiplet);

 	info.total_dsr_bytes = GRU_NUM_DSR_BYTES;
 	info.total_cbr = GRU_NUM_CB;
 	info.total_user_dsr_bytes = GRU_NUM_DSR_BYTES -
 		gru->gs_reserved_dsr_bytes;
 	info.total_user_cbr = GRU_NUM_CB - gru->gs_reserved_cbrs;
 	info.free_user_dsr_bytes = hweight64(gru->gs_dsr_map) *
 			GRU_DSR_AU_BYTES;
 	info.free_user_cbr = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;

 	if (copy_to_user((void __user *)arg, &info, sizeof(info)))
 		return -EFAULT;
 	return 0;
 }

 /*
  * gru_file_unlocked_ioctl
  *
  * Called to update file attributes via IOCTL calls.
  */
 static long gru_file_unlocked_ioctl(struct file *file, unsigned int req,
 				    unsigned long arg)
 {
 	int err = -EBADRQC;

 	gru_dbg(grudev, "file %p\n", file);

 	switch (req) {
 	case GRU_CREATE_CONTEXT:
 		err = gru_create_new_context(arg);
 		break;
 	case GRU_SET_TASK_SLICE:
 		err = gru_set_task_slice(arg);
 		break;
 	case GRU_USER_GET_EXCEPTION_DETAIL:
 		err = gru_get_exception_detail(arg);
 		break;
 	case GRU_USER_UNLOAD_CONTEXT:
 		err = gru_user_unload_context(arg);
 		break;
 	case GRU_GET_CHIPLET_STATUS:
 		err = gru_get_chiplet_status(arg);
 		break;
 	case GRU_USER_FLUSH_TLB:
 		err = gru_user_flush_tlb(arg);
 		break;
 	case GRU_USER_CALL_OS:
 		err = gru_handle_user_call_os(arg);
 		break;
 	case GRU_GET_CONFIG_INFO:
 		err = gru_get_config_info(arg);
 		break;
 	}
 	return err;
 }

 /*
  * Called at init time to build tables for all GRUs that are present in the
  * system.
  */
 static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
 			     void *vaddr, int nid, int bid, int grunum)
 {
 	spin_lock_init(&gru->gs_lock);
 	spin_lock_init(&gru->gs_asid_lock);
 	gru->gs_gru_base_paddr = paddr;
 	gru->gs_gru_base_vaddr = vaddr;
 	gru->gs_gid = bid * GRU_CHIPLETS_PER_BLADE + grunum;
 	gru->gs_blade = gru_base[bid];
 	gru->gs_blade_id = bid;
 	gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
 	gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
 	gru->gs_asid_limit = MAX_ASID;
 	gru_tgh_flush_init(gru);
 	if (gru->gs_gid >= gru_max_gids)
 		gru_max_gids = gru->gs_gid + 1;
 	gru_dbg(grudev, "bid %d, nid %d, gid %d, vaddr %p (0x%lx)\n",
 		bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr,
 		gru->gs_gru_base_paddr);
 	gru_kservices_init(gru);
 }

 static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
 {
 	int pnode, nid, bid, chip;
 	int cbrs, dsrbytes, n;
 	int order = get_order(sizeof(struct gru_blade_state));
 	struct page *page;
 	struct gru_state *gru;
 	unsigned long paddr;
 	void *vaddr;

 	max_user_cbrs = GRU_NUM_CB;
 	max_user_dsr_bytes = GRU_NUM_DSR_BYTES;
 	for_each_online_node(nid) {
 		bid = uv_node_to_blade_id(nid);
 		pnode = uv_node_to_pnode(nid);
 		if (bid < 0 || gru_base[bid])
 			continue;
 		page = alloc_pages_node(nid, GFP_KERNEL, order);
 		if (!page)
 			goto fail;
 		gru_base[bid] = page_address(page);
 		memset(gru_base[bid], 0, sizeof(struct gru_blade_state));
 		gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0];
 		spin_lock_init(&gru_base[bid]->bs_lock);

 		dsrbytes = 0;
 		cbrs = 0;
 		for (gru = gru_base[bid]->bs_grus, chip = 0;
 				chip < GRU_CHIPLETS_PER_BLADE;
 				chip++, gru++) {
 			paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip);
 			vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip);
 			gru_init_chiplet(gru, paddr, vaddr, nid, bid, chip);
 			n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
 			cbrs = max(cbrs, n);
 			n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
 			dsrbytes = max(dsrbytes, n);
 		}
 		max_user_cbrs = min(max_user_cbrs, cbrs);
 		max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes);
 	}

 	return 0;

 fail:
 	for (nid--; nid >= 0; nid--)
 		free_pages((unsigned long)gru_base[nid], order);
 	return -ENOMEM;
 }

 #ifdef CONFIG_IA64

 static int get_base_irq(void)
 {
 	return IRQ_GRU;
 }

 #elif defined CONFIG_X86_64

 static void noop(unsigned int irq)
 {
 }

 static struct irq_chip gru_chip = {
 	.name		= "gru",
 	.mask		= noop,
 	.unmask		= noop,
 	.ack		= noop,
 };

 static int get_base_irq(void)
 {
 	set_irq_chip(IRQ_GRU, &gru_chip);
 	set_irq_chip(IRQ_GRU + 1, &gru_chip);
 	return IRQ_GRU;
 }
 #endif

 /*
  * gru_init
  *
  * Called at boot or module load time to initialize the GRUs.
  */
 static int __init gru_init(void)
 {
 	int ret, irq, chip;
 	char id[10];
 	void *gru_start_vaddr;

 	if (!is_uv_system())
 		return -ENODEV;

 #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);
 	irq = get_base_irq();
 	for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) {
 		ret = request_irq(irq + chip, gru_intr, 0, id, NULL);
 		/* TODO: fix irq handling on x86. For now ignore failure because
 		 * interrupts are not required & not yet fully supported */
 		if (ret) {
 			printk(KERN_WARNING
 			       "!!!WARNING: GRU ignoring request failure!!!\n");
 			ret = 0;
 		}
 		if (ret) {
 			printk(KERN_ERR "%s: request_irq failed\n",
 			       GRU_DRIVER_ID_STR);
 			goto exit1;
 		}
 	}

 	ret = misc_register(&gru_miscdev);
 	if (ret) {
 		printk(KERN_ERR "%s: misc_register failed\n",
 		       GRU_DRIVER_ID_STR);
 		goto exit1;
 	}

 	ret = gru_proc_init();
 	if (ret) {
 		printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
 		goto exit2;
 	}

 	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 exit3;
 	}

 	printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
 	       GRU_DRIVER_VERSION_STR);
 	return 0;

 exit3:
 	gru_proc_exit();
 exit2:
 	misc_deregister(&gru_miscdev);
 exit1:
 	for (--chip; chip >= 0; chip--)
 		free_irq(irq + chip, NULL);
 	return ret;

 }

 static void __exit gru_exit(void)
 {
 	int i, bid, gid;
 	int order = get_order(sizeof(struct gru_state) *
 			      GRU_CHIPLETS_PER_BLADE);

 	if (!is_uv_system())
 		return;

 	for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
 		free_irq(IRQ_GRU + i, NULL);

 	foreach_gid(gid)
 		gru_kservices_exit(GID_TO_GRU(gid));

 	for (bid = 0; bid < GRU_MAX_BLADES; bid++)
 		free_pages((unsigned long)gru_base[bid], order);

 	misc_deregister(&gru_miscdev);
 	gru_proc_exit();
 }

 static struct file_operations gru_fops = {
 	.owner		= THIS_MODULE,
 	.unlocked_ioctl	= gru_file_unlocked_ioctl,
 	.mmap		= gru_file_mmap,
 };

 static struct miscdevice gru_miscdev = {
 	.minor		= MISC_DYNAMIC_MINOR,
 	.name		= "gru",
 	.fops		= &gru_fops,
 };

 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);
	/*
	* SN Platform GRU Driver
	*
	* FILE OPERATIONS & DRIVER INITIALIZATION
	*
	* This file supports the user system call for file open, close, mmap, etc.
	* This also incudes the driver initialization code.
	*
	* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/slab.h>
	#include <linux/mm.h>
	#include <linux/io.h>
	#include <linux/smp_lock.h>
	#include <linux/spinlock.h>
	#include <linux/device.h>
	#include <linux/miscdevice.h>
	#include <linux/interrupt.h>
	#include <linux/proc_fs.h>
	#include <linux/uaccess.h>
	#include <asm/uv/uv.h>
	#include "gru.h"
	#include "grulib.h"
	#include "grutables.h"

	#include <asm/uv/uv_hub.h>
	#include <asm/uv/uv_mmrs.h>

	struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly;
	unsigned long gru_start_paddr __read_mostly;
	unsigned long gru_end_paddr __read_mostly;
	unsigned int gru_max_gids __read_mostly;
	struct gru_stats_s gru_stats;

	/* Guaranteed user available resources on each node */
	static int max_user_cbrs, max_user_dsr_bytes;

	static struct file_operations gru_fops;
	static struct miscdevice gru_miscdev;


	/*
	* gru_vma_close
	*
	* Called when unmapping a device mapping. Frees all gru resources
	* and tables belonging to the vma.
	*/
	static void gru_vma_close(struct vm_area_struct *vma)
	{
	struct gru_vma_data *vdata;
	struct gru_thread_state *gts;
	struct list_head entry, next;

	if (!vma->vm_private_data)
	return;

	vdata = vma->vm_private_data;
	vma->vm_private_data = NULL;
	gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file,
	vdata);
	list_for_each_safe(entry, next, &vdata->vd_head) {
	gts =
	list_entry(entry, struct gru_thread_state, ts_next);
	list_del(&gts->ts_next);
	mutex_lock(&gts->ts_ctxlock);
	if (gts->ts_gru)
	gru_unload_context(gts, 0);
	mutex_unlock(&gts->ts_ctxlock);
	gts_drop(gts);
	}
	kfree(vdata);
	STAT(vdata_free);
	}

	/*
	* gru_file_mmap
	*
	* Called when mmaping the device. Initializes the vma with a fault handler
	* and private data structure necessary to allocate, track, and free the
	* underlying pages.
	*/
	static int gru_file_mmap(struct file file, struct vm_area_struct vma)
	{
	if ((vma->vm_flags & (VM_SHARED \| VM_WRITE)) != (VM_SHARED \| VM_WRITE))
	return -EPERM;

	if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) \|\|
	vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
	return -EINVAL;

	vma->vm_flags \|=
	(VM_IO \| VM_DONTCOPY \| VM_LOCKED \| VM_DONTEXPAND \| VM_PFNMAP \|
	VM_RESERVED);
	vma->vm_page_prot = PAGE_SHARED;
	vma->vm_ops = &gru_vm_ops;

	vma->vm_private_data = gru_alloc_vma_data(vma, 0);
	if (!vma->vm_private_data)
	return -ENOMEM;

	gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n",
	file, vma->vm_start, vma, vma->vm_private_data);
	return 0;
	}

	/*
	* Create a new GRU context
	*/
	static int gru_create_new_context(unsigned long arg)
	{
	struct gru_create_context_req req;
	struct vm_area_struct *vma;
	struct gru_vma_data *vdata;
	int ret = -EINVAL;


	if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
	return -EFAULT;

	if (req.data_segment_bytes == 0 \|\|
	req.data_segment_bytes > max_user_dsr_bytes)
	return -EINVAL;
	if (!req.control_blocks \|\| !req.maximum_thread_count \|\|
	req.control_blocks > max_user_cbrs)
	return -EINVAL;

	if (!(req.options & GRU_OPT_MISS_MASK))
	req.options \|= GRU_OPT_MISS_FMM_INTR;

	down_write(&current->mm->mmap_sem);
	vma = gru_find_vma(req.gseg);
	if (vma) {
	vdata = vma->vm_private_data;
	vdata->vd_user_options = req.options;
	vdata->vd_dsr_au_count =
	GRU_DS_BYTES_TO_AU(req.data_segment_bytes);
	vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks);
	ret = 0;
	}
	up_write(&current->mm->mmap_sem);

	return ret;
	}

	/*
	* Get GRU configuration info (temp - for emulator testing)
	*/
	static long gru_get_config_info(unsigned long arg)
	{
	struct gru_config_info info;
	int nodesperblade;

	if (num_online_nodes() > 1 &&
	(uv_node_to_blade_id(1) == uv_node_to_blade_id(0)))
	nodesperblade = 2;
	else
	nodesperblade = 1;
	info.cpus = num_online_cpus();
	info.nodes = num_online_nodes();
	info.blades = info.nodes / nodesperblade;
	info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades;

	if (copy_to_user((void __user *)arg, &info, sizeof(info)))
	return -EFAULT;
	return 0;
	}

	/*
	* Get GRU chiplet status
	*/
	static long gru_get_chiplet_status(unsigned long arg)
	{
	struct gru_state *gru;
	struct gru_chiplet_info info;

	if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
	return -EFAULT;

	if (info.node == -1)
	info.node = numa_node_id();
	if (info.node >= num_possible_nodes() \|\|
	info.chiplet >= GRU_CHIPLETS_PER_HUB \|\|
	info.node < 0 \|\| info.chiplet < 0)
	return -EINVAL;

	info.blade = uv_node_to_blade_id(info.node);
	gru = get_gru(info.blade, info.chiplet);

	info.total_dsr_bytes = GRU_NUM_DSR_BYTES;
	info.total_cbr = GRU_NUM_CB;
	info.total_user_dsr_bytes = GRU_NUM_DSR_BYTES -
	gru->gs_reserved_dsr_bytes;
	info.total_user_cbr = GRU_NUM_CB - gru->gs_reserved_cbrs;
	info.free_user_dsr_bytes = hweight64(gru->gs_dsr_map) *
	GRU_DSR_AU_BYTES;
	info.free_user_cbr = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;

	if (copy_to_user((void __user *)arg, &info, sizeof(info)))
	return -EFAULT;
	return 0;
	}

	/*
	* gru_file_unlocked_ioctl
	*
	* Called to update file attributes via IOCTL calls.
	*/
	static long gru_file_unlocked_ioctl(struct file *file, unsigned int req,
	unsigned long arg)
	{
	int err = -EBADRQC;

	gru_dbg(grudev, "file %p\n", file);

	switch (req) {
	case GRU_CREATE_CONTEXT:
	err = gru_create_new_context(arg);
	break;
	case GRU_SET_TASK_SLICE:
	err = gru_set_task_slice(arg);
	break;
	case GRU_USER_GET_EXCEPTION_DETAIL:
	err = gru_get_exception_detail(arg);
	break;
	case GRU_USER_UNLOAD_CONTEXT:
	err = gru_user_unload_context(arg);
	break;
	case GRU_GET_CHIPLET_STATUS:
	err = gru_get_chiplet_status(arg);
	break;
	case GRU_USER_FLUSH_TLB:
	err = gru_user_flush_tlb(arg);
	break;
	case GRU_USER_CALL_OS:
	err = gru_handle_user_call_os(arg);
	break;
	case GRU_GET_CONFIG_INFO:
	err = gru_get_config_info(arg);
	break;
	}
	return err;
	}

	/*
	* Called at init time to build tables for all GRUs that are present in the
	* system.
	*/
	static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
	void *vaddr, int nid, int bid, int grunum)
	{
	spin_lock_init(&gru->gs_lock);
	spin_lock_init(&gru->gs_asid_lock);
	gru->gs_gru_base_paddr = paddr;
	gru->gs_gru_base_vaddr = vaddr;
	gru->gs_gid = bid * GRU_CHIPLETS_PER_BLADE + grunum;
	gru->gs_blade = gru_base[bid];
	gru->gs_blade_id = bid;
	gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
	gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
	gru->gs_asid_limit = MAX_ASID;
	gru_tgh_flush_init(gru);
	if (gru->gs_gid >= gru_max_gids)
	gru_max_gids = gru->gs_gid + 1;
	gru_dbg(grudev, "bid %d, nid %d, gid %d, vaddr %p (0x%lx)\n",
	bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr,
	gru->gs_gru_base_paddr);
	gru_kservices_init(gru);
	}

	static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
	{
	int pnode, nid, bid, chip;
	int cbrs, dsrbytes, n;
	int order = get_order(sizeof(struct gru_blade_state));
	struct page *page;
	struct gru_state *gru;
	unsigned long paddr;
	void *vaddr;

	max_user_cbrs = GRU_NUM_CB;
	max_user_dsr_bytes = GRU_NUM_DSR_BYTES;
	for_each_online_node(nid) {
	bid = uv_node_to_blade_id(nid);
	pnode = uv_node_to_pnode(nid);
	if (bid < 0 \|\| gru_base[bid])
	continue;
	page = alloc_pages_node(nid, GFP_KERNEL, order);
	if (!page)
	goto fail;
	gru_base[bid] = page_address(page);
	memset(gru_base[bid], 0, sizeof(struct gru_blade_state));
	gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0];
	spin_lock_init(&gru_base[bid]->bs_lock);

	dsrbytes = 0;
	cbrs = 0;
	for (gru = gru_base[bid]->bs_grus, chip = 0;
	chip < GRU_CHIPLETS_PER_BLADE;
	chip++, gru++) {
	paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip);
	vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip);
	gru_init_chiplet(gru, paddr, vaddr, nid, bid, chip);
	n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
	cbrs = max(cbrs, n);
	n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
	dsrbytes = max(dsrbytes, n);
	}
	max_user_cbrs = min(max_user_cbrs, cbrs);
	max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes);
	}

	return 0;

	fail:
	for (nid--; nid >= 0; nid--)
	free_pages((unsigned long)gru_base[nid], order);
	return -ENOMEM;
	}

	#ifdef CONFIG_IA64

	static int get_base_irq(void)
	{
	return IRQ_GRU;
	}

	#elif defined CONFIG_X86_64

	static void noop(unsigned int irq)
	{
	}

	static struct irq_chip gru_chip = {
	.name = "gru",
	.mask = noop,
	.unmask = noop,
	.ack = noop,
	};

	static int get_base_irq(void)
	{
	set_irq_chip(IRQ_GRU, &gru_chip);
	set_irq_chip(IRQ_GRU + 1, &gru_chip);
	return IRQ_GRU;
	}
	#endif

	/*
	* gru_init
	*
	* Called at boot or module load time to initialize the GRUs.
	*/
	static int __init gru_init(void)
	{
	int ret, irq, chip;
	char id[10];
	void *gru_start_vaddr;

	if (!is_uv_system())
	return -ENODEV;

	#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);
	irq = get_base_irq();
	for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) {
	ret = request_irq(irq + chip, gru_intr, 0, id, NULL);
	/* TODO: fix irq handling on x86. For now ignore failure because
	* interrupts are not required & not yet fully supported */
	if (ret) {
	printk(KERN_WARNING
	"!!!WARNING: GRU ignoring request failure!!!\n");
	ret = 0;
	}
	if (ret) {
	printk(KERN_ERR "%s: request_irq failed\n",
	GRU_DRIVER_ID_STR);
	goto exit1;
	}
	}

	ret = misc_register(&gru_miscdev);
	if (ret) {
	printk(KERN_ERR "%s: misc_register failed\n",
	GRU_DRIVER_ID_STR);
	goto exit1;
	}

	ret = gru_proc_init();
	if (ret) {
	printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
	goto exit2;
	}

	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 exit3;
	}

	printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
	GRU_DRIVER_VERSION_STR);
	return 0;

	exit3:
	gru_proc_exit();
	exit2:
	misc_deregister(&gru_miscdev);
	exit1:
	for (--chip; chip >= 0; chip--)
	free_irq(irq + chip, NULL);
	return ret;

	}

	static void __exit gru_exit(void)
	{
	int i, bid, gid;
	int order = get_order(sizeof(struct gru_state) *
	GRU_CHIPLETS_PER_BLADE);

	if (!is_uv_system())
	return;

	for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
	free_irq(IRQ_GRU + i, NULL);

	foreach_gid(gid)
	gru_kservices_exit(GID_TO_GRU(gid));

	for (bid = 0; bid < GRU_MAX_BLADES; bid++)
	free_pages((unsigned long)gru_base[bid], order);

	misc_deregister(&gru_miscdev);
	gru_proc_exit();
	}

	static struct file_operations gru_fops = {
	.owner = THIS_MODULE,
	.unlocked_ioctl = gru_file_unlocked_ioctl,
	.mmap = gru_file_mmap,
	};

	static struct miscdevice gru_miscdev = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "gru",
	.fops = &gru_fops,
	};

	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);