[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / misc / sgi-gru / grufile.c

/*
 * 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;
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 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 > 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;

	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_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 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);
}

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_exact_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, 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];

	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);
	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;
	}
	gru_kservices_init();

	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;
	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);
	gru_kservices_exit();
	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);
Commit	Line	Data
78cf1de4 JS	1	/*
	2	* SN Platform GRU Driver
	3	*
	4	* FILE OPERATIONS & DRIVER INITIALIZATION
	5	*
	6	* This file supports the user system call for file open, close, mmap, etc.
	7	* This also incudes the driver initialization code.
	8	*
	9	* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	24	*/
	25
	26	#include <linux/module.h>
	27	#include <linux/kernel.h>
	28	#include <linux/errno.h>
	29	#include <linux/slab.h>
	30	#include <linux/mm.h>
	31	#include <linux/io.h>
	32	#include <linux/smp_lock.h>
	33	#include <linux/spinlock.h>
	34	#include <linux/device.h>
	35	#include <linux/miscdevice.h>
	36	#include <linux/interrupt.h>
	37	#include <linux/proc_fs.h>
	38	#include <linux/uaccess.h>
1c004004	39	#include <asm/uv/uv.h>
78cf1de4 JS	40	#include "gru.h"
	41	#include "grulib.h"
	42	#include "grutables.h"
	43
78cf1de4 JS	44	#include <asm/uv/uv_hub.h>
	45	#include <asm/uv/uv_mmrs.h>
	46
	47	struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly;
fe5bb6b0	48	unsigned long gru_start_paddr __read_mostly;
1a2c09e3	49	void *gru_start_vaddr __read_mostly;
fe5bb6b0	50	unsigned long gru_end_paddr __read_mostly;
e1c3219d	51	unsigned int gru_max_gids __read_mostly;
78cf1de4 JS	52	struct gru_stats_s gru_stats;
	53
	54	/* Guaranteed user available resources on each node */
	55	static int max_user_cbrs, max_user_dsr_bytes;
	56
	57	static struct file_operations gru_fops;
	58	static struct miscdevice gru_miscdev;
	59
	60
	61	/*
	62	* gru_vma_close
	63	*
	64	* Called when unmapping a device mapping. Frees all gru resources
	65	* and tables belonging to the vma.
	66	*/
	67	static void gru_vma_close(struct vm_area_struct *vma)
	68	{
	69	struct gru_vma_data *vdata;
	70	struct gru_thread_state *gts;
	71	struct list_head entry, next;
	72
	73	if (!vma->vm_private_data)
	74	return;
	75
	76	vdata = vma->vm_private_data;
	77	vma->vm_private_data = NULL;
	78	gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file,
	79	vdata);
	80	list_for_each_safe(entry, next, &vdata->vd_head) {
	81	gts =
	82	list_entry(entry, struct gru_thread_state, ts_next);
	83	list_del(&gts->ts_next);
	84	mutex_lock(&gts->ts_ctxlock);
	85	if (gts->ts_gru)
	86	gru_unload_context(gts, 0);
	87	mutex_unlock(&gts->ts_ctxlock);
	88	gts_drop(gts);
	89	}
	90	kfree(vdata);
	91	STAT(vdata_free);
	92	}
	93
	94	/*
	95	* gru_file_mmap
	96	*
	97	* Called when mmaping the device. Initializes the vma with a fault handler
	98	* and private data structure necessary to allocate, track, and free the
	99	* underlying pages.
	100	*/
	101	static int gru_file_mmap(struct file file, struct vm_area_struct vma)
	102	{
	103	if ((vma->vm_flags & (VM_SHARED \| VM_WRITE)) != (VM_SHARED \| VM_WRITE))
	104	return -EPERM;
	105
9ca8e40c	106	if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) \|\|
fe5bb6b0	107	vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
9ca8e40c JS	108	return -EINVAL;
9ca8e40c JS	109
78cf1de4 JS	110	vma->vm_flags \|=
	111	(VM_IO \| VM_DONTCOPY \| VM_LOCKED \| VM_DONTEXPAND \| VM_PFNMAP \|
	112	VM_RESERVED);
	113	vma->vm_page_prot = PAGE_SHARED;
	114	vma->vm_ops = &gru_vm_ops;
	115
	116	vma->vm_private_data = gru_alloc_vma_data(vma, 0);
	117	if (!vma->vm_private_data)
	118	return -ENOMEM;
	119
	120	gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n",
	121	file, vma->vm_start, vma, vma->vm_private_data);
	122	return 0;
	123	}
	124
	125	/*
	126	* Create a new GRU context
	127	*/
	128	static int gru_create_new_context(unsigned long arg)
	129	{
	130	struct gru_create_context_req req;
	131	struct vm_area_struct *vma;
	132	struct gru_vma_data *vdata;
	133	int ret = -EINVAL;
	134
	135
	136	if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
	137	return -EFAULT;
	138
3eac2e95	139	if (req.data_segment_bytes > max_user_dsr_bytes)
78cf1de4	140	return -EINVAL;
3eac2e95	141	if (req.control_blocks > max_user_cbrs \|\| !req.maximum_thread_count)
78cf1de4 JS	142	return -EINVAL;
	143
	144	if (!(req.options & GRU_OPT_MISS_MASK))
	145	req.options \|= GRU_OPT_MISS_FMM_INTR;
	146
	147	down_write(&current->mm->mmap_sem);
	148	vma = gru_find_vma(req.gseg);
	149	if (vma) {
	150	vdata = vma->vm_private_data;
	151	vdata->vd_user_options = req.options;
	152	vdata->vd_dsr_au_count =
	153	GRU_DS_BYTES_TO_AU(req.data_segment_bytes);
	154	vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks);
	155	ret = 0;
	156	}
	157	up_write(&current->mm->mmap_sem);
	158
	159	return ret;
	160	}
	161
	162	/*
	163	* Get GRU configuration info (temp - for emulator testing)
	164	*/
	165	static long gru_get_config_info(unsigned long arg)
	166	{
	167	struct gru_config_info info;
	168	int nodesperblade;
	169
	170	if (num_online_nodes() > 1 &&
	171	(uv_node_to_blade_id(1) == uv_node_to_blade_id(0)))
	172	nodesperblade = 2;
	173	else
	174	nodesperblade = 1;
	175	info.cpus = num_online_cpus();
	176	info.nodes = num_online_nodes();
	177	info.blades = info.nodes / nodesperblade;
	178	info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades;
	179
	180	if (copy_to_user((void __user *)arg, &info, sizeof(info)))
	181	return -EFAULT;
	182	return 0;
	183	}
	184
	185	/*
	186	* Get GRU chiplet status
	187	*/
	188	static long gru_get_chiplet_status(unsigned long arg)
	189	{
	190	struct gru_state *gru;
	191	struct gru_chiplet_info info;
	192
	193	if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
	194	return -EFAULT;
	195
	196	if (info.node == -1)
	197	info.node = numa_node_id();
	198	if (info.node >= num_possible_nodes() \|\|
	199	info.chiplet >= GRU_CHIPLETS_PER_HUB \|\|
	200	info.node < 0 \|\| info.chiplet < 0)
	201	return -EINVAL;
	202
	203	info.blade = uv_node_to_blade_id(info.node);
	204	gru = get_gru(info.blade, info.chiplet);
	205
206	info.total_dsr_bytes = GRU_NUM_DSR_BYTES;
207	info.total_cbr = GRU_NUM_CB;
208	info.total_user_dsr_bytes = GRU_NUM_DSR_BYTES -
209	gru->gs_reserved_dsr_bytes;
210	info.total_user_cbr = GRU_NUM_CB - gru->gs_reserved_cbrs;
211	info.free_user_dsr_bytes = hweight64(gru->gs_dsr_map) *
212	GRU_DSR_AU_BYTES;
213	info.free_user_cbr = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
214
215	if (copy_to_user((void __user *)arg, &info, sizeof(info)))
216	return -EFAULT;
217	return 0;
218	}
219
220	/*
221	* gru_file_unlocked_ioctl
222	*
223	* Called to update file attributes via IOCTL calls.
224	*/
225	static long gru_file_unlocked_ioctl(struct file *file, unsigned int req,
226	unsigned long arg)
227	{
228	int err = -EBADRQC;
229
230	gru_dbg(grudev, "file %p\n", file);
231
232	switch (req) {
233	case GRU_CREATE_CONTEXT:
234	err = gru_create_new_context(arg);
235	break;
236	case GRU_SET_TASK_SLICE:
237	err = gru_set_task_slice(arg);
238	break;
239	case GRU_USER_GET_EXCEPTION_DETAIL:
240	err = gru_get_exception_detail(arg);
241	break;
242	case GRU_USER_UNLOAD_CONTEXT:
243	err = gru_user_unload_context(arg);
244	break;
245	case GRU_GET_CHIPLET_STATUS:
246	err = gru_get_chiplet_status(arg);
247	break;
248	case GRU_USER_FLUSH_TLB:
249	err = gru_user_flush_tlb(arg);
250	break;
251	case GRU_USER_CALL_OS:
252	err = gru_handle_user_call_os(arg);
253	break;
eb5bd5e5 JS	254	case GRU_KTEST:
	255	err = gru_ktest(arg);
	256	break;
78cf1de4 JS	257	case GRU_GET_CONFIG_INFO:
	258	err = gru_get_config_info(arg);
	259	break;
9cc9b056 JS	260	case GRU_DUMP_CHIPLET_STATE:
	261	err = gru_dump_chiplet_request(arg);
	262	break;
78cf1de4 JS	263	}
	264	return err;
	265	}
	266
	267	/*
	268	* Called at init time to build tables for all GRUs that are present in the
	269	* system.
	270	*/
	271	static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
	272	void *vaddr, int nid, int bid, int grunum)
	273	{
	274	spin_lock_init(&gru->gs_lock);
	275	spin_lock_init(&gru->gs_asid_lock);
	276	gru->gs_gru_base_paddr = paddr;
	277	gru->gs_gru_base_vaddr = vaddr;
	278	gru->gs_gid = bid * GRU_CHIPLETS_PER_BLADE + grunum;
	279	gru->gs_blade = gru_base[bid];
	280	gru->gs_blade_id = bid;
	281	gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
	282	gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
87419412	283	gru->gs_asid_limit = MAX_ASID;
78cf1de4	284	gru_tgh_flush_init(gru);
e1c3219d JS	285	if (gru->gs_gid >= gru_max_gids)
e1c3219d JS	286	gru_max_gids = gru->gs_gid + 1;
43884604	287	gru_dbg(grudev, "bid %d, nid %d, gid %d, vaddr %p (0x%lx)\n",
78cf1de4 JS	288	bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr,
78cf1de4 JS	289	gru->gs_gru_base_paddr);
78cf1de4 JS	290	}
	291
	292	static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
	293	{
	294	int pnode, nid, bid, chip;
	295	int cbrs, dsrbytes, n;
	296	int order = get_order(sizeof(struct gru_blade_state));
	297	struct page *page;
	298	struct gru_state *gru;
	299	unsigned long paddr;
	300	void *vaddr;
	301
	302	max_user_cbrs = GRU_NUM_CB;
	303	max_user_dsr_bytes = GRU_NUM_DSR_BYTES;
	304	for_each_online_node(nid) {
	305	bid = uv_node_to_blade_id(nid);
	306	pnode = uv_node_to_pnode(nid);
fe5bb6b0	307	if (bid < 0 \|\| gru_base[bid])
78cf1de4	308	continue;
6484eb3e	309	page = alloc_pages_exact_node(nid, GFP_KERNEL, order);
78cf1de4 JS	310	if (!page)
	311	goto fail;
	312	gru_base[bid] = page_address(page);
	313	memset(gru_base[bid], 0, sizeof(struct gru_blade_state));
	314	gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0];
	315	spin_lock_init(&gru_base[bid]->bs_lock);
d5826dd6	316	init_rwsem(&gru_base[bid]->bs_kgts_sema);
78cf1de4 JS	317
	318	dsrbytes = 0;
	319	cbrs = 0;
	320	for (gru = gru_base[bid]->bs_grus, chip = 0;
fe5bb6b0	321	chip < GRU_CHIPLETS_PER_BLADE;
78cf1de4 JS	322	chip++, gru++) {
	323	paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip);
	324	vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip);
fe5bb6b0	325	gru_init_chiplet(gru, paddr, vaddr, nid, bid, chip);
78cf1de4 JS	326	n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
	327	cbrs = max(cbrs, n);
	328	n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
	329	dsrbytes = max(dsrbytes, n);
	330	}
	331	max_user_cbrs = min(max_user_cbrs, cbrs);
	332	max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes);
	333	}
	334
	335	return 0;
	336
	337	fail:
	338	for (nid--; nid >= 0; nid--)
	339	free_pages((unsigned long)gru_base[nid], order);
	340	return -ENOMEM;
	341	}
	342
	343	#ifdef CONFIG_IA64
	344
	345	static int get_base_irq(void)
	346	{
	347	return IRQ_GRU;
	348	}
	349
	350	#elif defined CONFIG_X86_64
	351
	352	static void noop(unsigned int irq)
	353	{
	354	}
	355
	356	static struct irq_chip gru_chip = {
	357	.name = "gru",
	358	.mask = noop,
	359	.unmask = noop,
	360	.ack = noop,
	361	};
	362
	363	static int get_base_irq(void)
	364	{
	365	set_irq_chip(IRQ_GRU, &gru_chip);
	366	set_irq_chip(IRQ_GRU + 1, &gru_chip);
	367	return IRQ_GRU;
	368	}
	369	#endif
	370
	371	/*
	372	* gru_init
	373	*
	374	* Called at boot or module load time to initialize the GRUs.
	375	*/
	376	static int __init gru_init(void)
	377	{
	378	int ret, irq, chip;
	379	char id[10];
78cf1de4	380
1c004004	381	if (!is_uv_system())
e873cff0	382	return 0;
78cf1de4 JS	383
	384	#if defined CONFIG_IA64
	385	gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */
	386	#else
	387	gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) &
	388	0x7fffffffffffUL;
78cf1de4 JS	389	#endif
78cf1de4 JS	390	gru_start_vaddr = __va(gru_start_paddr);
fe5bb6b0	391	gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE;
78cf1de4 JS	392	printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n",
	393	gru_start_paddr, gru_end_paddr);
	394	irq = get_base_irq();
	395	for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) {
	396	ret = request_irq(irq + chip, gru_intr, 0, id, NULL);
fe5bb6b0	397	/* TODO: fix irq handling on x86. For now ignore failure because
923f7f69 JS	398	* interrupts are not required & not yet fully supported */
923f7f69 JS	399	if (ret) {
fe5bb6b0 JS	400	printk(KERN_WARNING
fe5bb6b0 JS	401	"!!!WARNING: GRU ignoring request failure!!!\n");
923f7f69 JS	402	ret = 0;
923f7f69 JS	403	}
78cf1de4 JS	404	if (ret) {
	405	printk(KERN_ERR "%s: request_irq failed\n",
	406	GRU_DRIVER_ID_STR);
	407	goto exit1;
	408	}
	409	}
	410
	411	ret = misc_register(&gru_miscdev);
	412	if (ret) {
	413	printk(KERN_ERR "%s: misc_register failed\n",
	414	GRU_DRIVER_ID_STR);
	415	goto exit1;
	416	}
	417
	418	ret = gru_proc_init();
	419	if (ret) {
	420	printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
	421	goto exit2;
	422	}
	423
	424	ret = gru_init_tables(gru_start_paddr, gru_start_vaddr);
	425	if (ret) {
	426	printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR);
	427	goto exit3;
	428	}
d5826dd6	429	gru_kservices_init();
78cf1de4 JS	430
	431	printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
	432	GRU_DRIVER_VERSION_STR);
	433	return 0;
	434
	435	exit3:
	436	gru_proc_exit();
	437	exit2:
	438	misc_deregister(&gru_miscdev);
	439	exit1:
	440	for (--chip; chip >= 0; chip--)
	441	free_irq(irq + chip, NULL);
	442	return ret;
	443
	444	}
	445
	446	static void __exit gru_exit(void)
	447	{
d5826dd6	448	int i, bid;
78cf1de4 JS	449	int order = get_order(sizeof(struct gru_state) *
	450	GRU_CHIPLETS_PER_BLADE);
	451
1c004004	452	if (!is_uv_system())
8275d102 RH	453	return;
8275d102 RH	454
78cf1de4 JS	455	for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
78cf1de4 JS	456	free_irq(IRQ_GRU + i, NULL);
d5826dd6	457	gru_kservices_exit();
78cf1de4 JS	458	for (bid = 0; bid < GRU_MAX_BLADES; bid++)
	459	free_pages((unsigned long)gru_base[bid], order);
	460
	461	misc_deregister(&gru_miscdev);
	462	gru_proc_exit();
	463	}
	464
	465	static struct file_operations gru_fops = {
	466	.owner = THIS_MODULE,
	467	.unlocked_ioctl = gru_file_unlocked_ioctl,
	468	.mmap = gru_file_mmap,
	469	};
	470
	471	static struct miscdevice gru_miscdev = {
	472	.minor = MISC_DYNAMIC_MINOR,
	473	.name = "gru",
	474	.fops = &gru_fops,
	475	};
	476
	477	struct vm_operations_struct gru_vm_ops = {
	478	.close = gru_vma_close,
	479	.fault = gru_fault,
	480	};
	481
fe5bb6b0	482	#ifndef MODULE
026bde12	483	fs_initcall(gru_init);
fe5bb6b0 JS	484	#else
	485	module_init(gru_init);
	486	#endif
78cf1de4 JS	487	module_exit(gru_exit);
78cf1de4 JS	488
9ca8e40c JS	489	module_param(gru_options, ulong, 0644);
9ca8e40c JS	490	MODULE_PARM_DESC(gru_options, "Various debug options");
78cf1de4 JS	491
	492	MODULE_AUTHOR("Silicon Graphics, Inc.");
	493	MODULE_LICENSE("GPL");
	494	MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
	495	MODULE_VERSION(GRU_DRIVER_VERSION_STR);
	496