/*
* 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 "gru.h"
#include "grulib.h"
#include "grutables.h"
#if defined CONFIG_X86_64
#include <asm/genapic.h>
#include <asm/irq.h>
#define IS_UV() is_uv_system()
#elif defined CONFIG_IA64
#include <asm/system.h>
#include <asm/sn/simulator.h>
/* temp support for running on hardware simulator */
#define IS_UV() IS_MEDUSA() || ia64_platform_is("uv")
#else
#define IS_UV() 0
#endif
#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, gru_end_paddr __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(>s->ts_next);
mutex_lock(>s->ts_ctxlock);
if (gts->ts_gru)
gru_unload_context(gts, 0);
mutex_unlock(>s->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(¤t->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(¤t->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_tgh_flush_init(gru);
gru_dbg(grudev, "bid %d, nid %d, gru %x, 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 (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, bid, nid, 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())
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 + MAX_NUMNODES * 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);
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;
int order = get_order(sizeof(struct gru_state) *
GRU_CHIPLETS_PER_BLADE);
for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
free_irq(IRQ_GRU + i, NULL);
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,
};
module_init(gru_init);
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);
