Revert "x86-64/efi: Use EFI to deal with platform wall clock (again)"
This reverts commitbd52276fa1
("x86-64/efi: Use EFI to deal with platform wall clock (again)"), and the two supporting commits:da5a108d05
: "x86/kernel: remove tboot 1:1 page table creation code"185034e72d
: "x86, efi: 1:1 pagetable mapping for virtual EFI calls") as they all depend semantically on commit53b87cf088
("x86, mm: Include the entire kernel memory map in trampoline_pgd") that got reverted earlier due to the problems it caused. This was pointed out by Yinghai Lu, and verified by me on my Macbook Air that uses EFI. Pointed-out-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
5bd665f28d
commit
11520e5e7c
7 changed files with 116 additions and 55 deletions
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@ -69,37 +69,23 @@ extern u64 efi_call6(void *fp, u64 arg1, u64 arg2, u64 arg3,
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efi_call6((void *)(f), (u64)(a1), (u64)(a2), (u64)(a3), \
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(u64)(a4), (u64)(a5), (u64)(a6))
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extern unsigned long efi_call_virt_prelog(void);
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extern void efi_call_virt_epilog(unsigned long);
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#define efi_callx(x, func, ...) \
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({ \
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efi_status_t __status; \
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unsigned long __pgd; \
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\
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__pgd = efi_call_virt_prelog(); \
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__status = efi_call##x(func, __VA_ARGS__); \
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efi_call_virt_epilog(__pgd); \
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__status; \
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})
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#define efi_call_virt0(f) \
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efi_callx(0, (void *)(efi.systab->runtime->f))
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efi_call0((void *)(efi.systab->runtime->f))
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#define efi_call_virt1(f, a1) \
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efi_callx(1, (void *)(efi.systab->runtime->f), (u64)(a1))
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efi_call1((void *)(efi.systab->runtime->f), (u64)(a1))
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#define efi_call_virt2(f, a1, a2) \
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efi_callx(2, (void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2))
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efi_call2((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2))
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#define efi_call_virt3(f, a1, a2, a3) \
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efi_callx(3, (void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
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efi_call3((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
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(u64)(a3))
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#define efi_call_virt4(f, a1, a2, a3, a4) \
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efi_callx(4, (void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
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efi_call4((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
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(u64)(a3), (u64)(a4))
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#define efi_call_virt5(f, a1, a2, a3, a4, a5) \
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efi_callx(5, (void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
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efi_call5((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
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(u64)(a3), (u64)(a4), (u64)(a5))
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#define efi_call_virt6(f, a1, a2, a3, a4, a5, a6) \
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efi_callx(6, (void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
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efi_call6((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
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(u64)(a3), (u64)(a4), (u64)(a5), (u64)(a6))
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extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size,
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@ -103,13 +103,71 @@ void __init tboot_probe(void)
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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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};
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static inline void switch_to_tboot_pt(void)
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{
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#ifdef CONFIG_X86_32
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load_cr3(initial_page_table);
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#else
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write_cr3(real_mode_header->trampoline_pgd);
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#endif
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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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@ -167,6 +225,14 @@ void tboot_shutdown(u32 shutdown_type)
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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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@ -277,6 +343,8 @@ static __init int tboot_late_init(void)
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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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@ -919,13 +919,11 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
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/*
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* On success we use clflush, when the CPU supports it to
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* avoid the wbindv. If the CPU does not support it, in the
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* error case, and during early boot (for EFI) we fall back
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* to cpa_flush_all (which uses wbinvd):
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* avoid the wbindv. If the CPU does not support it and in the
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* error case we fall back to cpa_flush_all (which uses
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* wbindv):
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*/
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if (early_boot_irqs_disabled)
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__cpa_flush_all((void *)(long)cache);
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else if (!ret && cpu_has_clflush) {
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if (!ret && cpu_has_clflush) {
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if (cpa.flags & (CPA_PAGES_ARRAY | CPA_ARRAY)) {
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cpa_flush_array(addr, numpages, cache,
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cpa.flags, pages);
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@ -239,7 +239,22 @@ static efi_status_t __init phys_efi_set_virtual_address_map(
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return status;
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}
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static int efi_set_rtc_mmss(unsigned long nowtime)
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static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
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efi_time_cap_t *tc)
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{
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unsigned long flags;
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efi_status_t status;
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spin_lock_irqsave(&rtc_lock, flags);
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efi_call_phys_prelog();
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status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm),
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virt_to_phys(tc));
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efi_call_phys_epilog();
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spin_unlock_irqrestore(&rtc_lock, flags);
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return status;
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}
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int efi_set_rtc_mmss(unsigned long nowtime)
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{
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int real_seconds, real_minutes;
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efi_status_t status;
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@ -268,7 +283,7 @@ static int efi_set_rtc_mmss(unsigned long nowtime)
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return 0;
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}
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static unsigned long efi_get_time(void)
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unsigned long efi_get_time(void)
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{
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efi_status_t status;
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efi_time_t eft;
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@ -624,13 +639,18 @@ static int __init efi_runtime_init(void)
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}
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/*
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* We will only need *early* access to the following
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* EFI runtime service before set_virtual_address_map
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* two EFI runtime services before set_virtual_address_map
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* is invoked.
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*/
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efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
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efi_phys.set_virtual_address_map =
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(efi_set_virtual_address_map_t *)
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runtime->set_virtual_address_map;
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/*
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* Make efi_get_time can be called before entering
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* virtual mode.
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*/
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efi.get_time = phys_efi_get_time;
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early_iounmap(runtime, sizeof(efi_runtime_services_t));
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return 0;
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@ -716,10 +736,12 @@ void __init efi_init(void)
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efi_enabled = 0;
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return;
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}
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#ifdef CONFIG_X86_32
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if (efi_is_native()) {
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x86_platform.get_wallclock = efi_get_time;
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x86_platform.set_wallclock = efi_set_rtc_mmss;
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}
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#endif
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#if EFI_DEBUG
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print_efi_memmap();
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@ -58,21 +58,6 @@ static void __init early_code_mapping_set_exec(int executable)
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}
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}
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unsigned long efi_call_virt_prelog(void)
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{
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unsigned long saved;
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saved = read_cr3();
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write_cr3(real_mode_header->trampoline_pgd);
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return saved;
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}
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void efi_call_virt_epilog(unsigned long saved)
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{
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write_cr3(saved);
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}
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void __init efi_call_phys_prelog(void)
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{
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unsigned long vaddress;
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@ -587,6 +587,8 @@ extern u64 efi_mem_attribute (unsigned long phys_addr, unsigned long size);
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extern int __init efi_uart_console_only (void);
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extern void efi_initialize_iomem_resources(struct resource *code_resource,
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struct resource *data_resource, struct resource *bss_resource);
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extern unsigned long efi_get_time(void);
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extern int efi_set_rtc_mmss(unsigned long nowtime);
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extern void efi_reserve_boot_services(void);
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extern struct efi_memory_map memmap;
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@ -463,10 +463,6 @@ static void __init mm_init(void)
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percpu_init_late();
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pgtable_cache_init();
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vmalloc_init();
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#ifdef CONFIG_X86
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if (efi_enabled)
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efi_enter_virtual_mode();
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#endif
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}
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asmlinkage void __init start_kernel(void)
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calibrate_delay();
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pidmap_init();
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anon_vma_init();
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#ifdef CONFIG_X86
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if (efi_enabled)
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efi_enter_virtual_mode();
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#endif
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thread_info_cache_init();
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cred_init();
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fork_init(totalram_pages);
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