--- /dev/null
+/*
+ * 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) 2008-2014 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/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;
+
+ 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);
+ vdata->vd_tlb_preload_count = req.tlb_preload_count;
+ 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;
+ 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_MMR) &
+ 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();
+}
+
+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);
+
Code Review / kvmfornfv.git / blobdiff