diff options
Diffstat (limited to 'arch/x86/power/hibernate.c')
| -rw-r--r-- | arch/x86/power/hibernate.c | 132 |
1 files changed, 50 insertions, 82 deletions
diff --git a/arch/x86/power/hibernate.c b/arch/x86/power/hibernate.c index bcddf09b5aa3..a2294c1649f6 100644 --- a/arch/x86/power/hibernate.c +++ b/arch/x86/power/hibernate.c @@ -11,14 +11,15 @@ #include <linux/suspend.h> #include <linux/scatterlist.h> #include <linux/kdebug.h> - -#include <crypto/hash.h> +#include <linux/cpu.h> +#include <linux/pgtable.h> +#include <linux/types.h> +#include <linux/crc32.h> #include <asm/e820/api.h> #include <asm/init.h> #include <asm/proto.h> #include <asm/page.h> -#include <asm/pgtable.h> #include <asm/mtrr.h> #include <asm/sections.h> #include <asm/suspend.h> @@ -41,6 +42,7 @@ unsigned long relocated_restore_code __visible; /** * pfn_is_nosave - check if given pfn is in the 'nosave' section + * @pfn: the page frame number to check. */ int pfn_is_nosave(unsigned long pfn) { @@ -53,102 +55,42 @@ int pfn_is_nosave(unsigned long pfn) return pfn >= nosave_begin_pfn && pfn < nosave_end_pfn; } - -#define MD5_DIGEST_SIZE 16 - struct restore_data_record { unsigned long jump_address; unsigned long jump_address_phys; unsigned long cr3; unsigned long magic; - u8 e820_digest[MD5_DIGEST_SIZE]; + unsigned long e820_checksum; }; -#if IS_BUILTIN(CONFIG_CRYPTO_MD5) /** - * get_e820_md5 - calculate md5 according to given e820 table + * compute_e820_crc32 - calculate crc32 of a given e820 table * * @table: the e820 table to be calculated - * @buf: the md5 result to be stored to + * + * Return: the resulting checksum */ -static int get_e820_md5(struct e820_table *table, void *buf) +static inline u32 compute_e820_crc32(struct e820_table *table) { - struct crypto_shash *tfm; - struct shash_desc *desc; - int size; - int ret = 0; - - tfm = crypto_alloc_shash("md5", 0, 0); - if (IS_ERR(tfm)) - return -ENOMEM; - - desc = kmalloc(sizeof(struct shash_desc) + crypto_shash_descsize(tfm), - GFP_KERNEL); - if (!desc) { - ret = -ENOMEM; - goto free_tfm; - } - - desc->tfm = tfm; - desc->flags = 0; - - size = offsetof(struct e820_table, entries) + + int size = offsetof(struct e820_table, entries) + sizeof(struct e820_entry) * table->nr_entries; - if (crypto_shash_digest(desc, (u8 *)table, size, buf)) - ret = -EINVAL; - - kzfree(desc); - -free_tfm: - crypto_free_shash(tfm); - return ret; -} - -static int hibernation_e820_save(void *buf) -{ - return get_e820_md5(e820_table_firmware, buf); -} - -static bool hibernation_e820_mismatch(void *buf) -{ - int ret; - u8 result[MD5_DIGEST_SIZE]; - - memset(result, 0, MD5_DIGEST_SIZE); - /* If there is no digest in suspend kernel, let it go. */ - if (!memcmp(result, buf, MD5_DIGEST_SIZE)) - return false; - - ret = get_e820_md5(e820_table_firmware, result); - if (ret) - return true; - - return memcmp(result, buf, MD5_DIGEST_SIZE) ? true : false; + return ~crc32_le(~0, (unsigned char const *)table, size); } -#else -static int hibernation_e820_save(void *buf) -{ - return 0; -} - -static bool hibernation_e820_mismatch(void *buf) -{ - /* If md5 is not builtin for restore kernel, let it go. */ - return false; -} -#endif #ifdef CONFIG_X86_64 -#define RESTORE_MAGIC 0x23456789ABCDEF01UL +#define RESTORE_MAGIC 0x23456789ABCDEF02UL #else -#define RESTORE_MAGIC 0x12345678UL +#define RESTORE_MAGIC 0x12345679UL #endif /** * arch_hibernation_header_save - populate the architecture specific part * of a hibernation image header - * @addr: address to save the data at + * @addr: address where architecture specific header data will be saved. + * @max_size: maximum size of architecture specific data in hibernation header. + * + * Return: 0 on success, -EOVERFLOW if max_size is insufficient. */ int arch_hibernation_header_save(void *addr, unsigned int max_size) { @@ -179,7 +121,8 @@ int arch_hibernation_header_save(void *addr, unsigned int max_size) */ rdr->cr3 = restore_cr3 & ~CR3_PCID_MASK; - return hibernation_e820_save(rdr->e820_digest); + rdr->e820_checksum = compute_e820_crc32(e820_table_firmware); + return 0; } /** @@ -200,7 +143,7 @@ int arch_hibernation_header_restore(void *addr) jump_address_phys = rdr->jump_address_phys; restore_cr3 = rdr->cr3; - if (hibernation_e820_mismatch(rdr->e820_digest)) { + if (rdr->e820_checksum != compute_e820_crc32(e820_table_firmware)) { pr_crit("Hibernate inconsistent memory map detected!\n"); return -ENODEV; } @@ -220,23 +163,23 @@ int relocate_restore_code(void) if (!relocated_restore_code) return -ENOMEM; - memcpy((void *)relocated_restore_code, core_restore_code, PAGE_SIZE); + __memcpy((void *)relocated_restore_code, core_restore_code, PAGE_SIZE); /* Make the page containing the relocated code executable */ pgd = (pgd_t *)__va(read_cr3_pa()) + pgd_index(relocated_restore_code); p4d = p4d_offset(pgd, relocated_restore_code); - if (p4d_large(*p4d)) { + if (p4d_leaf(*p4d)) { set_p4d(p4d, __p4d(p4d_val(*p4d) & ~_PAGE_NX)); goto out; } pud = pud_offset(p4d, relocated_restore_code); - if (pud_large(*pud)) { + if (pud_leaf(*pud)) { set_pud(pud, __pud(pud_val(*pud) & ~_PAGE_NX)); goto out; } pmd = pmd_offset(pud, relocated_restore_code); - if (pmd_large(*pmd)) { + if (pmd_leaf(*pmd)) { set_pmd(pmd, __pmd(pmd_val(*pmd) & ~_PAGE_NX)); goto out; } @@ -246,3 +189,28 @@ out: __flush_tlb_all(); return 0; } + +int arch_resume_nosmt(void) +{ + int ret; + + /* + * We reached this while coming out of hibernation. This means + * that SMT siblings are sleeping in hlt, as mwait is not safe + * against control transition during resume (see comment in + * hibernate_resume_nonboot_cpu_disable()). + * + * If the resumed kernel has SMT disabled, we have to take all the + * SMT siblings out of hlt, and offline them again so that they + * end up in mwait proper. + * + * Called with hotplug disabled. + */ + cpu_hotplug_enable(); + + ret = arch_cpu_rescan_dead_smt_siblings(); + + cpu_hotplug_disable(); + + return ret; +} |