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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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621b195515
This change adds support for a new "super" bit in the PTE, using the new arch_make_huge_pte() method. The Tilera hypervisor sees the bit set at a given level of the page table and gangs together 4, 16, or 64 consecutive pages from that level of the hierarchy to create a larger TLB entry. One extra "super" page size can be specified at each of the three levels of the page table hierarchy on tilegx, using the "hugepagesz" argument on the boot command line. A new hypervisor API is added to allow Linux to tell the hypervisor how many PTEs to gang together at each level of the page table. To allow pre-allocating huge pages larger than the buddy allocator can handle, this change modifies the Tilera bootmem support to put all of memory on tilegx platforms into bootmem. As part of this change I eliminate the vestigial CONFIG_HIGHPTE support, which never worked anyway, and eliminate the hv_page_size() API in favor of the standard vma_kernel_pagesize() API. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
163 lines
3.5 KiB
C
163 lines
3.5 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#include <linux/smp.h>
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#include <linux/seq_file.h>
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/timex.h>
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#include <linux/delay.h>
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#include <linux/fs.h>
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#include <linux/proc_fs.h>
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#include <linux/sysctl.h>
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#include <linux/hardirq.h>
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#include <linux/hugetlb.h>
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#include <linux/mman.h>
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#include <asm/unaligned.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include <asm/sections.h>
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#include <asm/homecache.h>
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#include <asm/hardwall.h>
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#include <arch/chip.h>
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/*
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* Support /proc/cpuinfo
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*/
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#define cpu_to_ptr(n) ((void *)((long)(n)+1))
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#define ptr_to_cpu(p) ((long)(p) - 1)
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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int n = ptr_to_cpu(v);
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if (n == 0) {
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char buf[NR_CPUS*5];
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cpulist_scnprintf(buf, sizeof(buf), cpu_online_mask);
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seq_printf(m, "cpu count\t: %d\n", num_online_cpus());
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seq_printf(m, "cpu list\t: %s\n", buf);
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seq_printf(m, "model name\t: %s\n", chip_model);
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seq_printf(m, "flags\t\t:\n"); /* nothing for now */
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seq_printf(m, "cpu MHz\t\t: %llu.%06llu\n",
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get_clock_rate() / 1000000,
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(get_clock_rate() % 1000000));
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seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
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loops_per_jiffy/(500000/HZ),
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(loops_per_jiffy/(5000/HZ)) % 100);
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}
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#ifdef CONFIG_SMP
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if (!cpu_online(n))
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return 0;
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#endif
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seq_printf(m, "processor\t: %d\n", n);
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/* Print only num_online_cpus() blank lines total. */
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if (cpumask_next(n, cpu_online_mask) < nr_cpu_ids)
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seq_printf(m, "\n");
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return 0;
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}
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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return *pos < nr_cpu_ids ? cpu_to_ptr(*pos) : NULL;
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return c_start(m, pos);
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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}
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const struct seq_operations cpuinfo_op = {
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.start = c_start,
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.next = c_next,
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.stop = c_stop,
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.show = show_cpuinfo,
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};
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/*
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* Support /proc/tile directory
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*/
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static int __init proc_tile_init(void)
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{
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struct proc_dir_entry *root = proc_mkdir("tile", NULL);
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if (root == NULL)
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return 0;
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proc_tile_hardwall_init(root);
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return 0;
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}
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arch_initcall(proc_tile_init);
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/*
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* Support /proc/sys/tile directory
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*/
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#ifndef __tilegx__ /* FIXME: GX: no support for unaligned access yet */
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static ctl_table unaligned_subtable[] = {
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{
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.procname = "enabled",
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.data = &unaligned_fixup,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.procname = "printk",
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.data = &unaligned_printk,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{
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.procname = "count",
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.data = &unaligned_fixup_count,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec
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},
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{}
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};
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static ctl_table unaligned_table[] = {
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{
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.procname = "unaligned_fixup",
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.mode = 0555,
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.child = unaligned_subtable
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},
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{}
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};
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static struct ctl_path tile_path[] = {
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{ .procname = "tile" },
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{ }
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};
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static int __init proc_sys_tile_init(void)
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{
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register_sysctl_paths(tile_path, unaligned_table);
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return 0;
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}
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arch_initcall(proc_sys_tile_init);
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#endif
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