![Andrea Arcangeli](/assets/img/avatar_default.png)
pte alloc routines must wait for split_huge_page if the pmd is not present and not null (i.e. pmd_trans_splitting). The additional branches are optimized away at compile time by pmd_trans_splitting if the config option is off. However we must pass the vma down in order to know the anon_vma lock to wait for. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
451 lines
11 KiB
C
451 lines
11 KiB
C
/*
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* tboot.c: main implementation of helper functions used by kernel for
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* runtime support of Intel(R) Trusted Execution Technology
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*
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* Copyright (c) 2006-2009, Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <linux/dma_remapping.h>
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#include <linux/init_task.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/dmar.h>
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#include <linux/cpu.h>
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#include <linux/pfn.h>
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#include <linux/mm.h>
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#include <linux/tboot.h>
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#include <asm/trampoline.h>
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#include <asm/processor.h>
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#include <asm/bootparam.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/fixmap.h>
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#include <asm/proto.h>
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#include <asm/setup.h>
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#include <asm/e820.h>
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#include <asm/io.h>
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#include "acpi/realmode/wakeup.h"
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/* Global pointer to shared data; NULL means no measured launch. */
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struct tboot *tboot __read_mostly;
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EXPORT_SYMBOL(tboot);
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/* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */
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#define AP_WAIT_TIMEOUT 1
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#undef pr_fmt
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#define pr_fmt(fmt) "tboot: " fmt
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static u8 tboot_uuid[16] __initdata = TBOOT_UUID;
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void __init tboot_probe(void)
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{
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/* Look for valid page-aligned address for shared page. */
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if (!boot_params.tboot_addr)
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return;
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/*
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* also verify that it is mapped as we expect it before calling
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* set_fixmap(), to reduce chance of garbage value causing crash
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*/
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if (!e820_any_mapped(boot_params.tboot_addr,
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boot_params.tboot_addr, E820_RESERVED)) {
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pr_warning("non-0 tboot_addr but it is not of type E820_RESERVED\n");
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return;
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}
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/* only a natively booted kernel should be using TXT */
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if (paravirt_enabled()) {
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pr_warning("non-0 tboot_addr but pv_ops is enabled\n");
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return;
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}
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/* Map and check for tboot UUID. */
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set_fixmap(FIX_TBOOT_BASE, boot_params.tboot_addr);
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tboot = (struct tboot *)fix_to_virt(FIX_TBOOT_BASE);
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if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) {
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pr_warning("tboot at 0x%llx is invalid\n",
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boot_params.tboot_addr);
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tboot = NULL;
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return;
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}
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if (tboot->version < 5) {
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pr_warning("tboot version is invalid: %u\n", tboot->version);
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tboot = NULL;
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return;
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}
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pr_info("found shared page at phys addr 0x%llx:\n",
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boot_params.tboot_addr);
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pr_debug("version: %d\n", tboot->version);
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pr_debug("log_addr: 0x%08x\n", tboot->log_addr);
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pr_debug("shutdown_entry: 0x%x\n", tboot->shutdown_entry);
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pr_debug("tboot_base: 0x%08x\n", tboot->tboot_base);
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pr_debug("tboot_size: 0x%x\n", tboot->tboot_size);
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}
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static pgd_t *tboot_pg_dir;
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static struct mm_struct tboot_mm = {
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.mm_rb = RB_ROOT,
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.pgd = swapper_pg_dir,
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.mm_users = ATOMIC_INIT(2),
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.mm_count = ATOMIC_INIT(1),
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.mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem),
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.page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
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.mmlist = LIST_HEAD_INIT(init_mm.mmlist),
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.cpu_vm_mask = CPU_MASK_ALL,
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};
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static inline void switch_to_tboot_pt(void)
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{
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write_cr3(virt_to_phys(tboot_pg_dir));
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}
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static int map_tboot_page(unsigned long vaddr, unsigned long pfn,
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pgprot_t prot)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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pgd = pgd_offset(&tboot_mm, vaddr);
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pud = pud_alloc(&tboot_mm, pgd, vaddr);
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if (!pud)
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return -1;
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pmd = pmd_alloc(&tboot_mm, pud, vaddr);
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if (!pmd)
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return -1;
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pte = pte_alloc_map(&tboot_mm, NULL, pmd, vaddr);
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if (!pte)
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return -1;
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set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot));
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pte_unmap(pte);
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return 0;
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}
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static int map_tboot_pages(unsigned long vaddr, unsigned long start_pfn,
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unsigned long nr)
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{
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/* Reuse the original kernel mapping */
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tboot_pg_dir = pgd_alloc(&tboot_mm);
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if (!tboot_pg_dir)
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return -1;
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for (; nr > 0; nr--, vaddr += PAGE_SIZE, start_pfn++) {
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if (map_tboot_page(vaddr, start_pfn, PAGE_KERNEL_EXEC))
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return -1;
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}
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return 0;
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}
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static void tboot_create_trampoline(void)
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{
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u32 map_base, map_size;
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/* Create identity map for tboot shutdown code. */
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map_base = PFN_DOWN(tboot->tboot_base);
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map_size = PFN_UP(tboot->tboot_size);
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if (map_tboot_pages(map_base << PAGE_SHIFT, map_base, map_size))
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panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n",
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map_base, map_size);
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}
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#ifdef CONFIG_ACPI_SLEEP
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static void add_mac_region(phys_addr_t start, unsigned long size)
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{
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struct tboot_mac_region *mr;
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phys_addr_t end = start + size;
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if (tboot->num_mac_regions >= MAX_TB_MAC_REGIONS)
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panic("tboot: Too many MAC regions\n");
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if (start && size) {
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mr = &tboot->mac_regions[tboot->num_mac_regions++];
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mr->start = round_down(start, PAGE_SIZE);
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mr->size = round_up(end, PAGE_SIZE) - mr->start;
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}
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}
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static int tboot_setup_sleep(void)
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{
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int i;
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tboot->num_mac_regions = 0;
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for (i = 0; i < e820.nr_map; i++) {
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if ((e820.map[i].type != E820_RAM)
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&& (e820.map[i].type != E820_RESERVED_KERN))
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continue;
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add_mac_region(e820.map[i].addr, e820.map[i].size);
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}
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tboot->acpi_sinfo.kernel_s3_resume_vector = acpi_wakeup_address;
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return 0;
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}
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#else /* no CONFIG_ACPI_SLEEP */
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static int tboot_setup_sleep(void)
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{
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/* S3 shutdown requested, but S3 not supported by the kernel... */
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BUG();
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return -1;
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}
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#endif
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void tboot_shutdown(u32 shutdown_type)
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{
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void (*shutdown)(void);
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if (!tboot_enabled())
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return;
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/*
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* if we're being called before the 1:1 mapping is set up then just
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* return and let the normal shutdown happen; this should only be
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* due to very early panic()
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*/
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if (!tboot_pg_dir)
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return;
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/* if this is S3 then set regions to MAC */
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if (shutdown_type == TB_SHUTDOWN_S3)
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if (tboot_setup_sleep())
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return;
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tboot->shutdown_type = shutdown_type;
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switch_to_tboot_pt();
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shutdown = (void(*)(void))(unsigned long)tboot->shutdown_entry;
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shutdown();
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/* should not reach here */
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while (1)
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halt();
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}
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static void tboot_copy_fadt(const struct acpi_table_fadt *fadt)
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{
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#define TB_COPY_GAS(tbg, g) \
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tbg.space_id = g.space_id; \
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tbg.bit_width = g.bit_width; \
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tbg.bit_offset = g.bit_offset; \
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tbg.access_width = g.access_width; \
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tbg.address = g.address;
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TB_COPY_GAS(tboot->acpi_sinfo.pm1a_cnt_blk, fadt->xpm1a_control_block);
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TB_COPY_GAS(tboot->acpi_sinfo.pm1b_cnt_blk, fadt->xpm1b_control_block);
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TB_COPY_GAS(tboot->acpi_sinfo.pm1a_evt_blk, fadt->xpm1a_event_block);
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TB_COPY_GAS(tboot->acpi_sinfo.pm1b_evt_blk, fadt->xpm1b_event_block);
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/*
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* We need phys addr of waking vector, but can't use virt_to_phys() on
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* &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys
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* addr.
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*/
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tboot->acpi_sinfo.wakeup_vector = fadt->facs +
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offsetof(struct acpi_table_facs, firmware_waking_vector);
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}
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void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
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{
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static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = {
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/* S0,1,2: */ -1, -1, -1,
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/* S3: */ TB_SHUTDOWN_S3,
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/* S4: */ TB_SHUTDOWN_S4,
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/* S5: */ TB_SHUTDOWN_S5 };
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if (!tboot_enabled())
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return;
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tboot_copy_fadt(&acpi_gbl_FADT);
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tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control;
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tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control;
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/* we always use the 32b wakeup vector */
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tboot->acpi_sinfo.vector_width = 32;
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if (sleep_state >= ACPI_S_STATE_COUNT ||
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acpi_shutdown_map[sleep_state] == -1) {
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pr_warning("unsupported sleep state 0x%x\n", sleep_state);
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return;
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}
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tboot_shutdown(acpi_shutdown_map[sleep_state]);
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}
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static atomic_t ap_wfs_count;
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static int tboot_wait_for_aps(int num_aps)
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{
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unsigned long timeout;
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timeout = AP_WAIT_TIMEOUT*HZ;
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while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps &&
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timeout) {
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mdelay(1);
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timeout--;
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}
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if (timeout)
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pr_warning("tboot wait for APs timeout\n");
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return !(atomic_read((atomic_t *)&tboot->num_in_wfs) == num_aps);
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}
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static int __cpuinit tboot_cpu_callback(struct notifier_block *nfb,
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unsigned long action, void *hcpu)
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{
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switch (action) {
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case CPU_DYING:
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atomic_inc(&ap_wfs_count);
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if (num_online_cpus() == 1)
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if (tboot_wait_for_aps(atomic_read(&ap_wfs_count)))
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return NOTIFY_BAD;
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break;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block tboot_cpu_notifier __cpuinitdata =
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{
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.notifier_call = tboot_cpu_callback,
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};
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static __init int tboot_late_init(void)
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{
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if (!tboot_enabled())
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return 0;
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tboot_create_trampoline();
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atomic_set(&ap_wfs_count, 0);
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register_hotcpu_notifier(&tboot_cpu_notifier);
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return 0;
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}
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late_initcall(tboot_late_init);
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/*
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* TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE)
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*/
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#define TXT_PUB_CONFIG_REGS_BASE 0xfed30000
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#define TXT_PRIV_CONFIG_REGS_BASE 0xfed20000
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/* # pages for each config regs space - used by fixmap */
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#define NR_TXT_CONFIG_PAGES ((TXT_PUB_CONFIG_REGS_BASE - \
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TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT)
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/* offsets from pub/priv config space */
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#define TXTCR_HEAP_BASE 0x0300
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#define TXTCR_HEAP_SIZE 0x0308
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#define SHA1_SIZE 20
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struct sha1_hash {
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u8 hash[SHA1_SIZE];
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};
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struct sinit_mle_data {
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u32 version; /* currently 6 */
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struct sha1_hash bios_acm_id;
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u32 edx_senter_flags;
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u64 mseg_valid;
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struct sha1_hash sinit_hash;
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struct sha1_hash mle_hash;
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struct sha1_hash stm_hash;
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struct sha1_hash lcp_policy_hash;
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u32 lcp_policy_control;
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u32 rlp_wakeup_addr;
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u32 reserved;
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u32 num_mdrs;
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u32 mdrs_off;
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u32 num_vtd_dmars;
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u32 vtd_dmars_off;
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} __packed;
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struct acpi_table_header *tboot_get_dmar_table(struct acpi_table_header *dmar_tbl)
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{
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void *heap_base, *heap_ptr, *config;
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if (!tboot_enabled())
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return dmar_tbl;
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/*
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* ACPI tables may not be DMA protected by tboot, so use DMAR copy
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* SINIT saved in SinitMleData in TXT heap (which is DMA protected)
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*/
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/* map config space in order to get heap addr */
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config = ioremap(TXT_PUB_CONFIG_REGS_BASE, NR_TXT_CONFIG_PAGES *
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PAGE_SIZE);
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if (!config)
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return NULL;
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/* now map TXT heap */
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heap_base = ioremap(*(u64 *)(config + TXTCR_HEAP_BASE),
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*(u64 *)(config + TXTCR_HEAP_SIZE));
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iounmap(config);
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if (!heap_base)
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return NULL;
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/* walk heap to SinitMleData */
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/* skip BiosData */
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heap_ptr = heap_base + *(u64 *)heap_base;
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/* skip OsMleData */
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heap_ptr += *(u64 *)heap_ptr;
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/* skip OsSinitData */
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heap_ptr += *(u64 *)heap_ptr;
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/* now points to SinitMleDataSize; set to SinitMleData */
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heap_ptr += sizeof(u64);
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/* get addr of DMAR table */
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dmar_tbl = (struct acpi_table_header *)(heap_ptr +
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((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off -
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sizeof(u64));
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/* don't unmap heap because dmar.c needs access to this */
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return dmar_tbl;
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}
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int tboot_force_iommu(void)
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{
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if (!tboot_enabled())
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return 0;
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if (no_iommu || swiotlb || dmar_disabled)
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pr_warning("Forcing Intel-IOMMU to enabled\n");
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dmar_disabled = 0;
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#ifdef CONFIG_SWIOTLB
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swiotlb = 0;
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#endif
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no_iommu = 0;
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return 1;
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}
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