drivers/misc/sgi-gru/grufile.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * 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) 2008-2014 Silicon Graphics, Inc.  All Rights Reserved.
  */

 #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/spinlock.h>
 #include <linux/device.h>
 #include <linux/miscdevice.h>
 #include <linux/interrupt.h>
 #include <linux/proc_fs.h>
 #include <linux/uaccess.h>
 #ifdef CONFIG_X86_64
 #include <asm/uv/uv_irq.h>
 #endif
 #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;
 void *gru_start_vaddr __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 miscdevice gru_miscdev;

 static int gru_supported(void)
 {
 	return is_uv_system() &&
 		(uv_hub_info->hub_revision < UV3_HUB_REVISION_BASE);
 }

 /*
  * 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 mmapping 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_PFNMAP | VM_LOCKED |
 			 VM_DONTCOPY | VM_DONTEXPAND | VM_DONTDUMP;
 	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 > max_user_dsr_bytes)
 		return -EINVAL;
 	if (req.control_blocks > max_user_cbrs || !req.maximum_thread_count)
 		return -EINVAL;

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

 	mmap_write_lock(current->mm);
 	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);
 		vdata->vd_tlb_preload_count = req.tlb_preload_count;
 		ret = 0;
 	}
 	mmap_write_unlock(current->mm);

 	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;
 	memset(&info, 0, sizeof(info));
 	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;
 }

 /*
  * 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, req 0x%x, 0x%lx\n", file, req, arg);

 	switch (req) {
 	case GRU_CREATE_CONTEXT:
 		err = gru_create_new_context(arg);
 		break;
 	case GRU_SET_CONTEXT_OPTION:
 		err = gru_set_context_option(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_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_GSEG_STATISTICS:
 		err = gru_get_gseg_statistics(arg);
 		break;
 	case GRU_KTEST:
 		err = gru_ktest(arg);
 		break;
 	case GRU_GET_CONFIG_INFO:
 		err = gru_get_config_info(arg);
 		break;
 	case GRU_DUMP_CHIPLET_STATE:
 		err = gru_dump_chiplet_request(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 blade_id, int chiplet_id)
 {
 	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 = blade_id * GRU_CHIPLETS_PER_BLADE + chiplet_id;
 	gru->gs_blade = gru_base[blade_id];
 	gru->gs_blade_id = blade_id;
 	gru->gs_chiplet_id = chiplet_id;
 	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, gid %d, vaddr %p (0x%lx)\n",
 		blade_id, gru->gs_gid, gru->gs_gru_base_vaddr,
 		gru->gs_gru_base_paddr);
 }

 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_possible_blade(bid) {
 		pnode = uv_blade_to_pnode(bid);
 		nid = uv_blade_to_memory_nid(bid);/* -1 if no memory on blade */
 		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);
 		init_rwsem(&gru_base[bid]->bs_kgts_sema);

 		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, 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 (bid--; bid >= 0; bid--)
 		free_pages((unsigned long)gru_base[bid], order);
 	return -ENOMEM;
 }

 static void gru_free_tables(void)
 {
 	int bid;
 	int order = get_order(sizeof(struct gru_state) *
 			      GRU_CHIPLETS_PER_BLADE);

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

 static unsigned long gru_chiplet_cpu_to_mmr(int chiplet, int cpu, int *corep)
 {
 	unsigned long mmr = 0;
 	int core;

 	/*
 	 * We target the cores of a blade and not the hyperthreads themselves.
 	 * There is a max of 8 cores per socket and 2 sockets per blade,
 	 * making for a max total of 16 cores (i.e., 16 CPUs without
 	 * hyperthreading and 32 CPUs with hyperthreading).
 	 */
 	core = uv_cpu_core_number(cpu) + UV_MAX_INT_CORES * uv_cpu_socket_number(cpu);
 	if (core >= GRU_NUM_TFM || uv_cpu_ht_number(cpu))
 		return 0;

 	if (chiplet == 0) {
 		mmr = UVH_GR0_TLB_INT0_CONFIG +
 		    core * (UVH_GR0_TLB_INT1_CONFIG - UVH_GR0_TLB_INT0_CONFIG);
 	} else if (chiplet == 1) {
 		mmr = UVH_GR1_TLB_INT0_CONFIG +
 		    core * (UVH_GR1_TLB_INT1_CONFIG - UVH_GR1_TLB_INT0_CONFIG);
 	} else {
 		BUG();
 	}

 	*corep = core;
 	return mmr;
 }

 #ifdef CONFIG_IA64

 static int gru_irq_count[GRU_CHIPLETS_PER_BLADE];

 static void gru_noop(struct irq_data *d)
 {
 }

 static struct irq_chip gru_chip[GRU_CHIPLETS_PER_BLADE] = {
 	[0 ... GRU_CHIPLETS_PER_BLADE - 1] {
 		.irq_mask	= gru_noop,
 		.irq_unmask	= gru_noop,
 		.irq_ack	= gru_noop
 	}
 };

 static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name,
 			irq_handler_t irq_handler, int cpu, int blade)
 {
 	unsigned long mmr;
 	int irq = IRQ_GRU + chiplet;
 	int ret, core;

 	mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
 	if (mmr == 0)
 		return 0;

 	if (gru_irq_count[chiplet] == 0) {
 		gru_chip[chiplet].name = irq_name;
 		ret = irq_set_chip(irq, &gru_chip[chiplet]);
 		if (ret) {
 			printk(KERN_ERR "%s: set_irq_chip failed, errno=%d\n",
 			       GRU_DRIVER_ID_STR, -ret);
 			return ret;
 		}

 		ret = request_irq(irq, irq_handler, 0, irq_name, NULL);
 		if (ret) {
 			printk(KERN_ERR "%s: request_irq failed, errno=%d\n",
 			       GRU_DRIVER_ID_STR, -ret);
 			return ret;
 		}
 	}
 	gru_irq_count[chiplet]++;

 	return 0;
 }

 static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade)
 {
 	unsigned long mmr;
 	int core, irq = IRQ_GRU + chiplet;

 	if (gru_irq_count[chiplet] == 0)
 		return;

 	mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
 	if (mmr == 0)
 		return;

 	if (--gru_irq_count[chiplet] == 0)
 		free_irq(irq, NULL);
 }

 #elif defined CONFIG_X86_64

 static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name,
 			irq_handler_t irq_handler, int cpu, int blade)
 {
 	unsigned long mmr;
 	int irq, core;
 	int ret;

 	mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
 	if (mmr == 0)
 		return 0;

 	irq = uv_setup_irq(irq_name, cpu, blade, mmr, UV_AFFINITY_CPU);
 	if (irq < 0) {
 		printk(KERN_ERR "%s: uv_setup_irq failed, errno=%d\n",
 		       GRU_DRIVER_ID_STR, -irq);
 		return irq;
 	}

 	ret = request_irq(irq, irq_handler, 0, irq_name, NULL);
 	if (ret) {
 		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 (!gru_supported())
 		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 (!gru_supported())
 		return;

 	gru_teardown_tlb_irqs();
 	gru_kservices_exit();
 	gru_free_tables();
 	misc_deregister(&gru_miscdev);
 	gru_proc_exit();
 	mmu_notifier_synchronize();
 }

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

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

 const struct vm_operations_struct gru_vm_ops = {
 	.close		= gru_vma_close,
 	.fault		= gru_fault,
 };

 #ifndef MODULE
 fs_initcall(gru_init);
 #else
 module_init(gru_init);
 #endif
 module_exit(gru_exit);

 module_param(gru_options, ulong, 0644);
 MODULE_PARM_DESC(gru_options, "Various debug options");

 MODULE_AUTHOR("Silicon Graphics, Inc.");
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
 MODULE_VERSION(GRU_DRIVER_VERSION_STR);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* 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) 2008-2014 Silicon Graphics, Inc. All Rights Reserved.
	*/

	#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/spinlock.h>
	#include <linux/device.h>
	#include <linux/miscdevice.h>
	#include <linux/interrupt.h>
	#include <linux/proc_fs.h>
	#include <linux/uaccess.h>
	#ifdef CONFIG_X86_64
	#include <asm/uv/uv_irq.h>
	#endif
	#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;
	void *gru_start_vaddr __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 miscdevice gru_miscdev;

	static int gru_supported(void)
	{
	return is_uv_system() &&
	(uv_hub_info->hub_revision < UV3_HUB_REVISION_BASE);
	}

	/*
	* 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 mmapping 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_PFNMAP \| VM_LOCKED \|
	VM_DONTCOPY \| VM_DONTEXPAND \| VM_DONTDUMP;
	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 > max_user_dsr_bytes)
	return -EINVAL;
	if (req.control_blocks > max_user_cbrs \|\| !req.maximum_thread_count)
	return -EINVAL;

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

	mmap_write_lock(current->mm);
	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);
	vdata->vd_tlb_preload_count = req.tlb_preload_count;
	ret = 0;
	}
	mmap_write_unlock(current->mm);

	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;
	memset(&info, 0, sizeof(info));
	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;
	}

	/*
	* 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, req 0x%x, 0x%lx\n", file, req, arg);

	switch (req) {
	case GRU_CREATE_CONTEXT:
	err = gru_create_new_context(arg);
	break;
	case GRU_SET_CONTEXT_OPTION:
	err = gru_set_context_option(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_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_GSEG_STATISTICS:
	err = gru_get_gseg_statistics(arg);
	break;
	case GRU_KTEST:
	err = gru_ktest(arg);
	break;
	case GRU_GET_CONFIG_INFO:
	err = gru_get_config_info(arg);
	break;
	case GRU_DUMP_CHIPLET_STATE:
	err = gru_dump_chiplet_request(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 blade_id, int chiplet_id)
	{
	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 = blade_id * GRU_CHIPLETS_PER_BLADE + chiplet_id;
	gru->gs_blade = gru_base[blade_id];
	gru->gs_blade_id = blade_id;
	gru->gs_chiplet_id = chiplet_id;
	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, gid %d, vaddr %p (0x%lx)\n",
	blade_id, gru->gs_gid, gru->gs_gru_base_vaddr,
	gru->gs_gru_base_paddr);
	}

	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_possible_blade(bid) {
	pnode = uv_blade_to_pnode(bid);
	nid = uv_blade_to_memory_nid(bid);/* -1 if no memory on blade */
	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);
	init_rwsem(&gru_base[bid]->bs_kgts_sema);

	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, 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 (bid--; bid >= 0; bid--)
	free_pages((unsigned long)gru_base[bid], order);
	return -ENOMEM;
	}

	static void gru_free_tables(void)
	{
	int bid;
	int order = get_order(sizeof(struct gru_state) *
	GRU_CHIPLETS_PER_BLADE);

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

	static unsigned long gru_chiplet_cpu_to_mmr(int chiplet, int cpu, int *corep)
	{
	unsigned long mmr = 0;
	int core;

	/*
	* We target the cores of a blade and not the hyperthreads themselves.
	* There is a max of 8 cores per socket and 2 sockets per blade,
	* making for a max total of 16 cores (i.e., 16 CPUs without
	* hyperthreading and 32 CPUs with hyperthreading).
	*/
	core = uv_cpu_core_number(cpu) + UV_MAX_INT_CORES * uv_cpu_socket_number(cpu);
	if (core >= GRU_NUM_TFM \|\| uv_cpu_ht_number(cpu))
	return 0;

	if (chiplet == 0) {
	mmr = UVH_GR0_TLB_INT0_CONFIG +
	core * (UVH_GR0_TLB_INT1_CONFIG - UVH_GR0_TLB_INT0_CONFIG);
	} else if (chiplet == 1) {
	mmr = UVH_GR1_TLB_INT0_CONFIG +
	core * (UVH_GR1_TLB_INT1_CONFIG - UVH_GR1_TLB_INT0_CONFIG);
	} else {
	BUG();
	}

	*corep = core;
	return mmr;
	}

	#ifdef CONFIG_IA64

	static int gru_irq_count[GRU_CHIPLETS_PER_BLADE];

	static void gru_noop(struct irq_data *d)
	{
	}

	static struct irq_chip gru_chip[GRU_CHIPLETS_PER_BLADE] = {
	[0 ... GRU_CHIPLETS_PER_BLADE - 1] {
	.irq_mask = gru_noop,
	.irq_unmask = gru_noop,
	.irq_ack = gru_noop
	}
	};

	static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name,
	irq_handler_t irq_handler, int cpu, int blade)
	{
	unsigned long mmr;
	int irq = IRQ_GRU + chiplet;
	int ret, core;

	mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
	if (mmr == 0)
	return 0;

	if (gru_irq_count[chiplet] == 0) {
	gru_chip[chiplet].name = irq_name;
	ret = irq_set_chip(irq, &gru_chip[chiplet]);
	if (ret) {
	printk(KERN_ERR "%s: set_irq_chip failed, errno=%d\n",
	GRU_DRIVER_ID_STR, -ret);
	return ret;
	}

	ret = request_irq(irq, irq_handler, 0, irq_name, NULL);
	if (ret) {
	printk(KERN_ERR "%s: request_irq failed, errno=%d\n",
	GRU_DRIVER_ID_STR, -ret);
	return ret;
	}
	}
	gru_irq_count[chiplet]++;

	return 0;
	}

	static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade)
	{
	unsigned long mmr;
	int core, irq = IRQ_GRU + chiplet;

	if (gru_irq_count[chiplet] == 0)
	return;

	mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
	if (mmr == 0)
	return;

	if (--gru_irq_count[chiplet] == 0)
	free_irq(irq, NULL);
	}

	#elif defined CONFIG_X86_64

	static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name,
	irq_handler_t irq_handler, int cpu, int blade)
	{
	unsigned long mmr;
	int irq, core;
	int ret;

	mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
	if (mmr == 0)
	return 0;

	irq = uv_setup_irq(irq_name, cpu, blade, mmr, UV_AFFINITY_CPU);
	if (irq < 0) {
	printk(KERN_ERR "%s: uv_setup_irq failed, errno=%d\n",
	GRU_DRIVER_ID_STR, -irq);
	return irq;
	}

	ret = request_irq(irq, irq_handler, 0, irq_name, NULL);
	if (ret) {
	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 (!gru_supported())
	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 (!gru_supported())
	return;

	gru_teardown_tlb_irqs();
	gru_kservices_exit();
	gru_free_tables();
	misc_deregister(&gru_miscdev);
	gru_proc_exit();
	mmu_notifier_synchronize();
	}

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

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

	const struct vm_operations_struct gru_vm_ops = {
	.close = gru_vma_close,
	.fault = gru_fault,
	};

	#ifndef MODULE
	fs_initcall(gru_init);
	#else
	module_init(gru_init);
	#endif
	module_exit(gru_exit);

	module_param(gru_options, ulong, 0644);
	MODULE_PARM_DESC(gru_options, "Various debug options");

	MODULE_AUTHOR("Silicon Graphics, Inc.");
	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
	MODULE_VERSION(GRU_DRIVER_VERSION_STR);