| // 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; |
| |
| vm_flags_set(vma, 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); |
| |