lkml.org 
[lkml]   [2008]   [Jun]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
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.




\
 
 \ /
  Last update: 2008-06-09 23:15    [from the cache]
©2003-2011 Jasper Spaans