diff options
Diffstat (limited to 'drivers/misc/sgi-gru/grufile.c')
| -rw-r--r-- | drivers/misc/sgi-gru/grufile.c | 485 |
1 files changed, 485 insertions, 0 deletions
diff --git a/drivers/misc/sgi-gru/grufile.c b/drivers/misc/sgi-gru/grufile.c new file mode 100644 index 00000000000..23c91f5f6b6 --- /dev/null +++ b/drivers/misc/sgi-gru/grufile.c @@ -0,0 +1,485 @@ +/* + * 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); + |