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    Subject[patch 05/11] GRU Driver - driver initialization, file & vma ops
    This file contains the functions for initializing the driver, handling file & vma
    operations and for processing IOCTL requests from the user.

    Signed-off-by: Jack Steiner <steiner@sgi.com>

    ---
    drivers/misc/gru/grufile.c | 474 +++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 474 insertions(+)

    Index: linux/drivers/misc/gru/grufile.c
    ===================================================================
    --- /dev/null 1970-01-01 00:00:00.000000000 +0000
    +++ linux/drivers/misc/gru/grufile.c 2008-06-09 13:53:05.852784983 -0500
    @@ -0,0 +1,474 @@
    +/*
    + * 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/smp_lock.h>
    +#include <linux/spinlock.h>
    +#include <linux/device.h>
    +#include <linux/miscdevice.h>
    +#include <linux/proc_fs.h>
    +#include <linux/interrupt.h>
    +#include <linux/uaccess.h>
    +#include "gru.h"
    +#include "grulib.h"
    +#include "grutables.h"
    +
    +#if defined __x86_64__
    +#include <asm/genapic.h>
    +#include <asm/irq.h>
    +#define IS_UV() is_uv_system()
    +#elif defined __ia64
    +#include <asm/system.h>
    +#define IS_UV() 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(&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;
    +
    + 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_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, grunum;
    + 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, grunum = 0;
    + grunum < GRU_CHIPLETS_PER_BLADE; grunum++, gru++) {
    + paddr = gru_base_paddr + GRUCHIPOFFSET(pnode, grunum);
    + vaddr = gru_base_vaddr + GRUCHIPOFFSET(pnode, grunum);
    + gru_init_chiplet(gru, paddr, vaddr, bid, nid, grunum);
    + 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 __ia64__
    +
    +static int get_base_irq(void)
    +{
    + return IRQ_GRU;
    +}
    +
    +#elif defined __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;
    + char id[10];
    + void *gru_start_vaddr;
    +
    + if (!IS_UV())
    + return 0;
    +
    +#if defined __ia64__
    + gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */
    +#else
    + gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR);
    +#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);
    + for (irq = get_base_irq(); irq < GRU_CHIPLETS_PER_BLADE; irq++) {
    + ret = request_irq(irq, 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 (--irq; irq >= 0; irq--)
    + free_irq(IRQ_GRU + irq, 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(options, ulong, 0644);
    +MODULE_PARM_DESC(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);
    +
    --
    Thanks

    Jack Steiner (steiner@sgi.com) 651-683-5302
    Sr Principal Engineer SGI - Silicon Graphics, Inc.




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