diff options
Diffstat (limited to 'drivers/misc/sgi-gru/grufile.c')
| -rw-r--r-- | drivers/misc/sgi-gru/grufile.c | 612 |
1 files changed, 612 insertions, 0 deletions
diff --git a/drivers/misc/sgi-gru/grufile.c b/drivers/misc/sgi-gru/grufile.c new file mode 100644 index 000000000..7ffcfc0bb --- /dev/null +++ b/drivers/misc/sgi-gru/grufile.c @@ -0,0 +1,612 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * 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. + * + * (C) Copyright 2020 Hewlett Packard Enterprise Development LP + * Copyright (c) 2008-2014 Silicon Graphics, Inc. All Rights Reserved. + */ + +#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/spinlock.h> +#include <linux/device.h> +#include <linux/miscdevice.h> +#include <linux/interrupt.h> +#include <linux/proc_fs.h> +#include <linux/uaccess.h> +#ifdef CONFIG_X86_64 +#include <asm/uv/uv_irq.h> +#endif +#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 miscdevice gru_miscdev; + +static int gru_supported(void) +{ + return is_uv_system() && + (uv_hub_info->hub_revision < UV3_HUB_REVISION_BASE); +} + +/* + * 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 mmapping 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_PFNMAP | VM_LOCKED | + VM_DONTCOPY | VM_DONTEXPAND | VM_DONTDUMP; + 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; + + mmap_write_lock(current->mm); + 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); + vdata->vd_tlb_preload_count = req.tlb_preload_count; + ret = 0; + } + mmap_write_unlock(current->mm); + + 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; + memset(&info, 0, sizeof(info)); + 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; +} + +/* + * 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, req 0x%x, 0x%lx\n", file, req, arg); + + switch (req) { + case GRU_CREATE_CONTEXT: + err = gru_create_new_context(arg); + break; + case GRU_SET_CONTEXT_OPTION: + err = gru_set_context_option(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_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_GSEG_STATISTICS: + err = gru_get_gseg_statistics(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 blade_id, int chiplet_id) +{ + 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 = blade_id * GRU_CHIPLETS_PER_BLADE + chiplet_id; + gru->gs_blade = gru_base[blade_id]; + gru->gs_blade_id = blade_id; + gru->gs_chiplet_id = chiplet_id; + 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, gid %d, vaddr %p (0x%lx)\n", + blade_id, 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_possible_blade(bid) { + pnode = uv_blade_to_pnode(bid); + nid = uv_blade_to_memory_nid(bid);/* -1 if no memory on blade */ + 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); + 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, 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 (bid--; bid >= 0; bid--) + free_pages((unsigned long)gru_base[bid], order); + return -ENOMEM; +} + +static void gru_free_tables(void) +{ + int bid; + int order = get_order(sizeof(struct gru_state) * + GRU_CHIPLETS_PER_BLADE); + + for (bid = 0; bid < GRU_MAX_BLADES; bid++) + free_pages((unsigned long)gru_base[bid], order); +} + +static unsigned long gru_chiplet_cpu_to_mmr(int chiplet, int cpu, int *corep) +{ + unsigned long mmr = 0; + int core; + + /* + * We target the cores of a blade and not the hyperthreads themselves. + * There is a max of 8 cores per socket and 2 sockets per blade, + * making for a max total of 16 cores (i.e., 16 CPUs without + * hyperthreading and 32 CPUs with hyperthreading). + */ + core = uv_cpu_core_number(cpu) + UV_MAX_INT_CORES * uv_cpu_socket_number(cpu); + if (core >= GRU_NUM_TFM || uv_cpu_ht_number(cpu)) + return 0; + + if (chiplet == 0) { + mmr = UVH_GR0_TLB_INT0_CONFIG + + core * (UVH_GR0_TLB_INT1_CONFIG - UVH_GR0_TLB_INT0_CONFIG); + } else if (chiplet == 1) { + mmr = UVH_GR1_TLB_INT0_CONFIG + + core * (UVH_GR1_TLB_INT1_CONFIG - UVH_GR1_TLB_INT0_CONFIG); + } else { + BUG(); + } + + *corep = core; + return mmr; +} + +#ifdef CONFIG_IA64 + +static int gru_irq_count[GRU_CHIPLETS_PER_BLADE]; + +static void gru_noop(struct irq_data *d) +{ +} + +static struct irq_chip gru_chip[GRU_CHIPLETS_PER_BLADE] = { + [0 ... GRU_CHIPLETS_PER_BLADE - 1] { + .irq_mask = gru_noop, + .irq_unmask = gru_noop, + .irq_ack = gru_noop + } +}; + +static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name, + irq_handler_t irq_handler, int cpu, int blade) +{ + unsigned long mmr; + int irq = IRQ_GRU + chiplet; + int ret, core; + + mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); + if (mmr == 0) + return 0; + + if (gru_irq_count[chiplet] == 0) { + gru_chip[chiplet].name = irq_name; + ret = irq_set_chip(irq, &gru_chip[chiplet]); + if (ret) { + printk(KERN_ERR "%s: set_irq_chip failed, errno=%d\n", + GRU_DRIVER_ID_STR, -ret); + return ret; + } + + ret = request_irq(irq, irq_handler, 0, irq_name, NULL); + if (ret) { + printk(KERN_ERR "%s: request_irq failed, errno=%d\n", + GRU_DRIVER_ID_STR, -ret); + return ret; + } + } + gru_irq_count[chiplet]++; + + return 0; +} + +static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade) +{ + unsigned long mmr; + int core, irq = IRQ_GRU + chiplet; + + if (gru_irq_count[chiplet] == 0) + return; + + mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); + if (mmr == 0) + return; + + if (--gru_irq_count[chiplet] == 0) + free_irq(irq, NULL); +} + +#elif defined CONFIG_X86_64 + +static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name, + irq_handler_t irq_handler, int cpu, int blade) +{ + unsigned long mmr; + int irq, core; + int ret; + + mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); + if (mmr == 0) + return 0; + + irq = uv_setup_irq(irq_name, cpu, blade, mmr, UV_AFFINITY_CPU); + if (irq < 0) { + printk(KERN_ERR "%s: uv_setup_irq failed, errno=%d\n", + GRU_DRIVER_ID_STR, -irq); + return irq; + } + + ret = request_irq(irq, irq_handler, 0, irq_name, NULL); + if (ret) { + uv_teardown_irq(irq); + printk(KERN_ERR "%s: request_irq failed, errno=%d\n", + GRU_DRIVER_ID_STR, -ret); + return ret; + } + gru_base[blade]->bs_grus[chiplet].gs_irq[core] = irq; + return 0; +} + +static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade) +{ + int irq, core; + unsigned long mmr; + + mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); + if (mmr) { + irq = gru_base[blade]->bs_grus[chiplet].gs_irq[core]; + if (irq) { + free_irq(irq, NULL); + uv_teardown_irq(irq); + } + } +} + +#endif + +static void gru_teardown_tlb_irqs(void) +{ + int blade; + int cpu; + + for_each_online_cpu(cpu) { + blade = uv_cpu_to_blade_id(cpu); + gru_chiplet_teardown_tlb_irq(0, cpu, blade); + gru_chiplet_teardown_tlb_irq(1, cpu, blade); + } + for_each_possible_blade(blade) { + if (uv_blade_nr_possible_cpus(blade)) + continue; + gru_chiplet_teardown_tlb_irq(0, 0, blade); + gru_chiplet_teardown_tlb_irq(1, 0, blade); + } +} + +static int gru_setup_tlb_irqs(void) +{ + int blade; + int cpu; + int ret; + + for_each_online_cpu(cpu) { + blade = uv_cpu_to_blade_id(cpu); + ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru0_intr, cpu, blade); + if (ret != 0) + goto exit1; + + ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru1_intr, cpu, blade); + if (ret != 0) + goto exit1; + } + for_each_possible_blade(blade) { + if (uv_blade_nr_possible_cpus(blade)) + continue; + ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru_intr_mblade, 0, blade); + if (ret != 0) + goto exit1; + + ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru_intr_mblade, 0, blade); + if (ret != 0) + goto exit1; + } + + return 0; + +exit1: + gru_teardown_tlb_irqs(); + return ret; +} + +/* + * gru_init + * + * Called at boot or module load time to initialize the GRUs. + */ +static int __init gru_init(void) +{ + int ret; + + if (!gru_supported()) + 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) & + 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); + ret = misc_register(&gru_miscdev); + if (ret) { + printk(KERN_ERR "%s: misc_register failed\n", + GRU_DRIVER_ID_STR); + goto exit0; + } + + ret = gru_proc_init(); + if (ret) { + printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR); + goto exit1; + } + + 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 exit2; + } + + ret = gru_setup_tlb_irqs(); + if (ret != 0) + goto exit3; + + gru_kservices_init(); + + printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR, + GRU_DRIVER_VERSION_STR); + return 0; + +exit3: + gru_free_tables(); +exit2: + gru_proc_exit(); +exit1: + misc_deregister(&gru_miscdev); +exit0: + return ret; + +} + +static void __exit gru_exit(void) +{ + if (!gru_supported()) + return; + + gru_teardown_tlb_irqs(); + gru_kservices_exit(); + gru_free_tables(); + misc_deregister(&gru_miscdev); + gru_proc_exit(); + mmu_notifier_synchronize(); +} + +static const struct file_operations gru_fops = { + .owner = THIS_MODULE, + .unlocked_ioctl = gru_file_unlocked_ioctl, + .mmap = gru_file_mmap, + .llseek = noop_llseek, +}; + +static struct miscdevice gru_miscdev = { + .minor = MISC_DYNAMIC_MINOR, + .name = "gru", + .fops = &gru_fops, +}; + +const 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); + |