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219 lines
5.6 KiB
219 lines
5.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Hibernation support for x86 |
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* |
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* Copyright (c) 2007 Rafael J. Wysocki <[email protected]> |
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* Copyright (c) 2002 Pavel Machek <[email protected]> |
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* Copyright (c) 2001 Patrick Mochel <[email protected]> |
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*/ |
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#include <linux/gfp.h> |
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#include <linux/smp.h> |
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#include <linux/suspend.h> |
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#include <linux/scatterlist.h> |
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#include <linux/kdebug.h> |
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#include <linux/cpu.h> |
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#include <linux/pgtable.h> |
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#include <linux/types.h> |
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#include <linux/crc32.h> |
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#include <asm/e820/api.h> |
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#include <asm/init.h> |
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#include <asm/proto.h> |
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#include <asm/page.h> |
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#include <asm/mtrr.h> |
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#include <asm/sections.h> |
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#include <asm/suspend.h> |
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#include <asm/tlbflush.h> |
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/* |
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* Address to jump to in the last phase of restore in order to get to the image |
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* kernel's text (this value is passed in the image header). |
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*/ |
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unsigned long restore_jump_address __visible; |
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unsigned long jump_address_phys; |
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/* |
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* Value of the cr3 register from before the hibernation (this value is passed |
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* in the image header). |
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*/ |
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unsigned long restore_cr3 __visible; |
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unsigned long temp_pgt __visible; |
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unsigned long relocated_restore_code __visible; |
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/** |
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* pfn_is_nosave - check if given pfn is in the 'nosave' section |
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*/ |
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int pfn_is_nosave(unsigned long pfn) |
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{ |
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unsigned long nosave_begin_pfn; |
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unsigned long nosave_end_pfn; |
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nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT; |
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nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT; |
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return pfn >= nosave_begin_pfn && pfn < nosave_end_pfn; |
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} |
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struct restore_data_record { |
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unsigned long jump_address; |
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unsigned long jump_address_phys; |
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unsigned long cr3; |
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unsigned long magic; |
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unsigned long e820_checksum; |
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}; |
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/** |
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* compute_e820_crc32 - calculate crc32 of a given e820 table |
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* |
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* @table: the e820 table to be calculated |
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* |
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* Return: the resulting checksum |
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*/ |
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static inline u32 compute_e820_crc32(struct e820_table *table) |
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{ |
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int size = offsetof(struct e820_table, entries) + |
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sizeof(struct e820_entry) * table->nr_entries; |
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return ~crc32_le(~0, (unsigned char const *)table, size); |
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} |
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#ifdef CONFIG_X86_64 |
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#define RESTORE_MAGIC 0x23456789ABCDEF02UL |
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#else |
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#define RESTORE_MAGIC 0x12345679UL |
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#endif |
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/** |
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* arch_hibernation_header_save - populate the architecture specific part |
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* of a hibernation image header |
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* @addr: address to save the data at |
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*/ |
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int arch_hibernation_header_save(void *addr, unsigned int max_size) |
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{ |
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struct restore_data_record *rdr = addr; |
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if (max_size < sizeof(struct restore_data_record)) |
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return -EOVERFLOW; |
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rdr->magic = RESTORE_MAGIC; |
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rdr->jump_address = (unsigned long)restore_registers; |
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rdr->jump_address_phys = __pa_symbol(restore_registers); |
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/* |
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* The restore code fixes up CR3 and CR4 in the following sequence: |
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* |
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* [in hibernation asm] |
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* 1. CR3 <= temporary page tables |
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* 2. CR4 <= mmu_cr4_features (from the kernel that restores us) |
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* 3. CR3 <= rdr->cr3 |
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* 4. CR4 <= mmu_cr4_features (from us, i.e. the image kernel) |
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* [in restore_processor_state()] |
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* 5. CR4 <= saved CR4 |
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* 6. CR3 <= saved CR3 |
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* |
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* Our mmu_cr4_features has CR4.PCIDE=0, and toggling |
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* CR4.PCIDE while CR3's PCID bits are nonzero is illegal, so |
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* rdr->cr3 needs to point to valid page tables but must not |
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* have any of the PCID bits set. |
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*/ |
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rdr->cr3 = restore_cr3 & ~CR3_PCID_MASK; |
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rdr->e820_checksum = compute_e820_crc32(e820_table_firmware); |
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return 0; |
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} |
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/** |
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* arch_hibernation_header_restore - read the architecture specific data |
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* from the hibernation image header |
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* @addr: address to read the data from |
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*/ |
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int arch_hibernation_header_restore(void *addr) |
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{ |
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struct restore_data_record *rdr = addr; |
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if (rdr->magic != RESTORE_MAGIC) { |
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pr_crit("Unrecognized hibernate image header format!\n"); |
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return -EINVAL; |
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} |
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restore_jump_address = rdr->jump_address; |
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jump_address_phys = rdr->jump_address_phys; |
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restore_cr3 = rdr->cr3; |
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if (rdr->e820_checksum != compute_e820_crc32(e820_table_firmware)) { |
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pr_crit("Hibernate inconsistent memory map detected!\n"); |
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return -ENODEV; |
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} |
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return 0; |
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} |
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int relocate_restore_code(void) |
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{ |
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pgd_t *pgd; |
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p4d_t *p4d; |
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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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relocated_restore_code = get_safe_page(GFP_ATOMIC); |
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if (!relocated_restore_code) |
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return -ENOMEM; |
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memcpy((void *)relocated_restore_code, core_restore_code, PAGE_SIZE); |
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/* Make the page containing the relocated code executable */ |
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pgd = (pgd_t *)__va(read_cr3_pa()) + |
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pgd_index(relocated_restore_code); |
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p4d = p4d_offset(pgd, relocated_restore_code); |
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if (p4d_large(*p4d)) { |
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set_p4d(p4d, __p4d(p4d_val(*p4d) & ~_PAGE_NX)); |
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goto out; |
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} |
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pud = pud_offset(p4d, relocated_restore_code); |
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if (pud_large(*pud)) { |
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set_pud(pud, __pud(pud_val(*pud) & ~_PAGE_NX)); |
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goto out; |
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} |
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pmd = pmd_offset(pud, relocated_restore_code); |
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if (pmd_large(*pmd)) { |
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set_pmd(pmd, __pmd(pmd_val(*pmd) & ~_PAGE_NX)); |
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goto out; |
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} |
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pte = pte_offset_kernel(pmd, relocated_restore_code); |
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set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_NX)); |
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out: |
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__flush_tlb_all(); |
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return 0; |
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} |
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int arch_resume_nosmt(void) |
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{ |
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int ret = 0; |
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/* |
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* We reached this while coming out of hibernation. This means |
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* that SMT siblings are sleeping in hlt, as mwait is not safe |
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* against control transition during resume (see comment in |
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* hibernate_resume_nonboot_cpu_disable()). |
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* |
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* If the resumed kernel has SMT disabled, we have to take all the |
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* SMT siblings out of hlt, and offline them again so that they |
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* end up in mwait proper. |
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* |
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* Called with hotplug disabled. |
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*/ |
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cpu_hotplug_enable(); |
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if (cpu_smt_control == CPU_SMT_DISABLED || |
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cpu_smt_control == CPU_SMT_FORCE_DISABLED) { |
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enum cpuhp_smt_control old = cpu_smt_control; |
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ret = cpuhp_smt_enable(); |
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if (ret) |
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goto out; |
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ret = cpuhp_smt_disable(old); |
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if (ret) |
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goto out; |
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} |
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out: |
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cpu_hotplug_disable(); |
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return ret; |
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}
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