^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Hibernate support specific for ARM64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Derived from work on ARM hibernation support by:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Ubuntu project, hibernation support for mach-dove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2010 Nokia Corporation (Hiroshi Doyu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyright (C) 2010 Texas Instruments, Inc. (Teerth Reddy et al.)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * https://lkml.org/lkml/2010/6/18/4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * https://lists.linux-foundation.org/pipermail/linux-pm/2010-June/027422.html
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * https://patchwork.kernel.org/patch/96442/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define pr_fmt(x) "hibernate: " x
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/kvm_host.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/pm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/suspend.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/utsname.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <asm/barrier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <asm/cputype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/daifflags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <asm/irqflags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <asm/kexec.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <asm/memory.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <asm/mmu_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <asm/mte.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <asm/pgalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <asm/pgtable-hwdef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <asm/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <asm/smp_plat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <asm/suspend.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <asm/sysreg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <asm/virt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * Hibernate core relies on this value being 0 on resume, and marks it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * __nosavedata assuming it will keep the resume kernel's '0' value. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * doesn't happen with either KASLR.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * defined as "__visible int in_suspend __nosavedata" in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * kernel/power/hibernate.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) extern int in_suspend;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /* Do we need to reset el2? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #define el2_reset_needed() (is_hyp_mode_available() && !is_kernel_in_hyp_mode())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /* temporary el2 vectors in the __hibernate_exit_text section. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) extern char hibernate_el2_vectors[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /* hyp-stub vectors, used to restore el2 during resume from hibernate. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) extern char __hyp_stub_vectors[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * The logical cpu number we should resume on, initialised to a non-cpu
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static int sleep_cpu = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * Values that may not change over hibernate/resume. We put the build number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * and date in here so that we guarantee not to resume with a different
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * kernel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct arch_hibernate_hdr_invariants {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) char uts_version[__NEW_UTS_LEN + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) /* These values need to be know across a hibernate/restore. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static struct arch_hibernate_hdr {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct arch_hibernate_hdr_invariants invariants;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /* These are needed to find the relocated kernel if built with kaslr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) phys_addr_t ttbr1_el1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) void (*reenter_kernel)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * We need to know where the __hyp_stub_vectors are after restore to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * re-configure el2.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) phys_addr_t __hyp_stub_vectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) u64 sleep_cpu_mpidr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) } resume_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static inline void arch_hdr_invariants(struct arch_hibernate_hdr_invariants *i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) memset(i, 0, sizeof(*i));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) memcpy(i->uts_version, init_utsname()->version, sizeof(i->uts_version));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) int pfn_is_nosave(unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) unsigned long nosave_begin_pfn = sym_to_pfn(&__nosave_begin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) unsigned long nosave_end_pfn = sym_to_pfn(&__nosave_end - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return ((pfn >= nosave_begin_pfn) && (pfn <= nosave_end_pfn)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) crash_is_nosave(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) void notrace save_processor_state(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) WARN_ON(num_online_cpus() != 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) void notrace restore_processor_state(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) int arch_hibernation_header_save(void *addr, unsigned int max_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) struct arch_hibernate_hdr *hdr = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (max_size < sizeof(*hdr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) arch_hdr_invariants(&hdr->invariants);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) hdr->ttbr1_el1 = __pa_symbol(swapper_pg_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) hdr->reenter_kernel = _cpu_resume;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) /* We can't use __hyp_get_vectors() because kvm may still be loaded */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (el2_reset_needed())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) hdr->__hyp_stub_vectors = __pa_symbol(__hyp_stub_vectors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) hdr->__hyp_stub_vectors = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /* Save the mpidr of the cpu we called cpu_suspend() on... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (sleep_cpu < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) pr_err("Failing to hibernate on an unknown CPU.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) hdr->sleep_cpu_mpidr = cpu_logical_map(sleep_cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) pr_info("Hibernating on CPU %d [mpidr:0x%llx]\n", sleep_cpu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) hdr->sleep_cpu_mpidr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) EXPORT_SYMBOL(arch_hibernation_header_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) int arch_hibernation_header_restore(void *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct arch_hibernate_hdr_invariants invariants;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) struct arch_hibernate_hdr *hdr = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) arch_hdr_invariants(&invariants);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (memcmp(&hdr->invariants, &invariants, sizeof(invariants))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) pr_crit("Hibernate image not generated by this kernel!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) sleep_cpu = get_logical_index(hdr->sleep_cpu_mpidr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) pr_info("Hibernated on CPU %d [mpidr:0x%llx]\n", sleep_cpu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) hdr->sleep_cpu_mpidr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (sleep_cpu < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) pr_crit("Hibernated on a CPU not known to this kernel!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) sleep_cpu = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) ret = bringup_hibernate_cpu(sleep_cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) sleep_cpu = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) resume_hdr = *hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) EXPORT_SYMBOL(arch_hibernation_header_restore);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) static int trans_pgd_map_page(pgd_t *trans_pgd, void *page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) unsigned long dst_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) pgprot_t pgprot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) pgd_t *pgdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) p4d_t *p4dp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) pud_t *pudp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) pmd_t *pmdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) pte_t *ptep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) pgdp = pgd_offset_pgd(trans_pgd, dst_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) if (pgd_none(READ_ONCE(*pgdp))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) pudp = (void *)get_safe_page(GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (!pudp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) pgd_populate(&init_mm, pgdp, pudp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) p4dp = p4d_offset(pgdp, dst_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (p4d_none(READ_ONCE(*p4dp))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) pudp = (void *)get_safe_page(GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (!pudp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) p4d_populate(&init_mm, p4dp, pudp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) pudp = pud_offset(p4dp, dst_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (pud_none(READ_ONCE(*pudp))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) pmdp = (void *)get_safe_page(GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) if (!pmdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) pud_populate(&init_mm, pudp, pmdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) pmdp = pmd_offset(pudp, dst_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) if (pmd_none(READ_ONCE(*pmdp))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) ptep = (void *)get_safe_page(GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) if (!ptep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) pmd_populate_kernel(&init_mm, pmdp, ptep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) ptep = pte_offset_kernel(pmdp, dst_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) set_pte(ptep, pfn_pte(virt_to_pfn(page), PAGE_KERNEL_EXEC));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * Copies length bytes, starting at src_start into an new page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * perform cache maintenance, then maps it at the specified address low
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) * address as executable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) * This is used by hibernate to copy the code it needs to execute when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) * overwriting the kernel text. This function generates a new set of page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) * tables, which it loads into ttbr0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) * Length is provided as we probably only want 4K of data, even on a 64K
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) * page system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) static int create_safe_exec_page(void *src_start, size_t length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) unsigned long dst_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) phys_addr_t *phys_dst_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) void *page = (void *)get_safe_page(GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) pgd_t *trans_pgd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) memcpy(page, src_start, length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) __flush_icache_range((unsigned long)page, (unsigned long)page + length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) trans_pgd = (void *)get_safe_page(GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) if (!trans_pgd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) rc = trans_pgd_map_page(trans_pgd, page, dst_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) PAGE_KERNEL_EXEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) * Load our new page tables. A strict BBM approach requires that we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) * ensure that TLBs are free of any entries that may overlap with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) * global mappings we are about to install.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) * For a real hibernate/resume cycle TTBR0 currently points to a zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) * page, but TLBs may contain stale ASID-tagged entries (e.g. for EFI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) * runtime services), while for a userspace-driven test_resume cycle it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * points to userspace page tables (and we must point it at a zero page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) * ourselves). Elsewhere we only (un)install the idmap with preemption
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) * disabled, so T0SZ should be as required regardless.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) cpu_set_reserved_ttbr0();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) local_flush_tlb_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) write_sysreg(phys_to_ttbr(virt_to_phys(trans_pgd)), ttbr0_el1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) isb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) *phys_dst_addr = virt_to_phys(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) #define dcache_clean_range(start, end) __flush_dcache_area(start, (end - start))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) #ifdef CONFIG_ARM64_MTE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) static DEFINE_XARRAY(mte_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) static int save_tags(struct page *page, unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) void *tag_storage, *ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) tag_storage = mte_allocate_tag_storage();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) if (!tag_storage)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) mte_save_page_tags(page_address(page), tag_storage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) ret = xa_store(&mte_pages, pfn, tag_storage, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (WARN(xa_is_err(ret), "Failed to store MTE tags")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) mte_free_tag_storage(tag_storage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) return xa_err(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) } else if (WARN(ret, "swsusp: %s: Duplicate entry", __func__)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) mte_free_tag_storage(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) static void swsusp_mte_free_storage(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) XA_STATE(xa_state, &mte_pages, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) void *tags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) xa_lock(&mte_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) xas_for_each(&xa_state, tags, ULONG_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) mte_free_tag_storage(tags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) xa_unlock(&mte_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) xa_destroy(&mte_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) static int swsusp_mte_save_tags(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) struct zone *zone;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) unsigned long pfn, max_zone_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) int n = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) if (!system_supports_mte())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) for_each_populated_zone(zone) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) max_zone_pfn = zone_end_pfn(zone);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) struct page *page = pfn_to_online_page(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (!test_bit(PG_mte_tagged, &page->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) ret = save_tags(page, pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) swsusp_mte_free_storage();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) n++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) pr_info("Saved %d MTE pages\n", n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) static void swsusp_mte_restore_tags(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) XA_STATE(xa_state, &mte_pages, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) int n = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) void *tags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) xa_lock(&mte_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) xas_for_each(&xa_state, tags, ULONG_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) unsigned long pfn = xa_state.xa_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) struct page *page = pfn_to_online_page(pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * It is not required to invoke page_kasan_tag_reset(page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) * at this point since the tags stored in page->flags are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) * already restored.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) mte_restore_page_tags(page_address(page), tags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) mte_free_tag_storage(tags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) n++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) xa_unlock(&mte_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) pr_info("Restored %d MTE pages\n", n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) xa_destroy(&mte_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) #else /* CONFIG_ARM64_MTE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) static int swsusp_mte_save_tags(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) static void swsusp_mte_restore_tags(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) #endif /* CONFIG_ARM64_MTE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) int swsusp_arch_suspend(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) struct sleep_stack_data state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) if (cpus_are_stuck_in_kernel()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) pr_err("Can't hibernate: no mechanism to offline secondary CPUs.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) flags = local_daif_save();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) if (__cpu_suspend_enter(&state)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) /* make the crash dump kernel image visible/saveable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) crash_prepare_suspend();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) ret = swsusp_mte_save_tags();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) sleep_cpu = smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) ret = swsusp_save();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) /* Clean kernel core startup/idle code to PoC*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) dcache_clean_range(__mmuoff_data_start, __mmuoff_data_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) dcache_clean_range(__idmap_text_start, __idmap_text_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) /* Clean kvm setup code to PoC? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) if (el2_reset_needed()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) dcache_clean_range(__hyp_idmap_text_start, __hyp_idmap_text_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) dcache_clean_range(__hyp_text_start, __hyp_text_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) swsusp_mte_restore_tags();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) /* make the crash dump kernel image protected again */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) crash_post_resume();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) * Tell the hibernation core that we've just restored
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) * the memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) in_suspend = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) sleep_cpu = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) __cpu_suspend_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) * Just in case the boot kernel did turn the SSBD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * mitigation off behind our back, let's set the state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) * to what we expect it to be.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) spectre_v4_enable_mitigation(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) local_daif_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) static void _copy_pte(pte_t *dst_ptep, pte_t *src_ptep, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) pte_t pte = READ_ONCE(*src_ptep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) if (pte_valid(pte)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) * Resume will overwrite areas that may be marked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) * read only (code, rodata). Clear the RDONLY bit from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) * the temporary mappings we use during restore.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) set_pte(dst_ptep, pte_mkwrite(pte));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) } else if (debug_pagealloc_enabled() && !pte_none(pte)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) * debug_pagealloc will removed the PTE_VALID bit if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) * the page isn't in use by the resume kernel. It may have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) * been in use by the original kernel, in which case we need
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) * to put it back in our copy to do the restore.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) * Before marking this entry valid, check the pfn should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) * be mapped.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) BUG_ON(!pfn_valid(pte_pfn(pte)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) set_pte(dst_ptep, pte_mkpresent(pte_mkwrite(pte)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) static int copy_pte(pmd_t *dst_pmdp, pmd_t *src_pmdp, unsigned long start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) pte_t *src_ptep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) pte_t *dst_ptep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) unsigned long addr = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) dst_ptep = (pte_t *)get_safe_page(GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (!dst_ptep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) pmd_populate_kernel(&init_mm, dst_pmdp, dst_ptep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) dst_ptep = pte_offset_kernel(dst_pmdp, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) src_ptep = pte_offset_kernel(src_pmdp, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) _copy_pte(dst_ptep, src_ptep, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) } while (dst_ptep++, src_ptep++, addr += PAGE_SIZE, addr != end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) static int copy_pmd(pud_t *dst_pudp, pud_t *src_pudp, unsigned long start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) pmd_t *src_pmdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) pmd_t *dst_pmdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) unsigned long addr = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) if (pud_none(READ_ONCE(*dst_pudp))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) dst_pmdp = (pmd_t *)get_safe_page(GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) if (!dst_pmdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) pud_populate(&init_mm, dst_pudp, dst_pmdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) dst_pmdp = pmd_offset(dst_pudp, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) src_pmdp = pmd_offset(src_pudp, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) pmd_t pmd = READ_ONCE(*src_pmdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) next = pmd_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) if (pmd_none(pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) if (pmd_table(pmd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) if (copy_pte(dst_pmdp, src_pmdp, addr, next))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) set_pmd(dst_pmdp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) __pmd(pmd_val(pmd) & ~PMD_SECT_RDONLY));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) } while (dst_pmdp++, src_pmdp++, addr = next, addr != end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) static int copy_pud(p4d_t *dst_p4dp, p4d_t *src_p4dp, unsigned long start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) pud_t *dst_pudp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) pud_t *src_pudp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) unsigned long addr = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) if (p4d_none(READ_ONCE(*dst_p4dp))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) dst_pudp = (pud_t *)get_safe_page(GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) if (!dst_pudp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) p4d_populate(&init_mm, dst_p4dp, dst_pudp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) dst_pudp = pud_offset(dst_p4dp, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) src_pudp = pud_offset(src_p4dp, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) pud_t pud = READ_ONCE(*src_pudp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) next = pud_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) if (pud_none(pud))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) if (pud_table(pud)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) if (copy_pmd(dst_pudp, src_pudp, addr, next))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) set_pud(dst_pudp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) __pud(pud_val(pud) & ~PUD_SECT_RDONLY));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) } while (dst_pudp++, src_pudp++, addr = next, addr != end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) static int copy_p4d(pgd_t *dst_pgdp, pgd_t *src_pgdp, unsigned long start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) p4d_t *dst_p4dp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) p4d_t *src_p4dp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) unsigned long addr = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) dst_p4dp = p4d_offset(dst_pgdp, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) src_p4dp = p4d_offset(src_pgdp, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) next = p4d_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) if (p4d_none(READ_ONCE(*src_p4dp)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) if (copy_pud(dst_p4dp, src_p4dp, addr, next))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) } while (dst_p4dp++, src_p4dp++, addr = next, addr != end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) static int copy_page_tables(pgd_t *dst_pgdp, unsigned long start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) unsigned long addr = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) pgd_t *src_pgdp = pgd_offset_k(start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) dst_pgdp = pgd_offset_pgd(dst_pgdp, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) next = pgd_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if (pgd_none(READ_ONCE(*src_pgdp)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) if (copy_p4d(dst_pgdp, src_pgdp, addr, next))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) } while (dst_pgdp++, src_pgdp++, addr = next, addr != end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) static int trans_pgd_create_copy(pgd_t **dst_pgdp, unsigned long start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) pgd_t *trans_pgd = (pgd_t *)get_safe_page(GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) if (!trans_pgd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) pr_err("Failed to allocate memory for temporary page tables.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) rc = copy_page_tables(trans_pgd, start, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) if (!rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) *dst_pgdp = trans_pgd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) * Setup then Resume from the hibernate image using swsusp_arch_suspend_exit().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) * Memory allocated by get_safe_page() will be dealt with by the hibernate code,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) * we don't need to free it here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) int swsusp_arch_resume(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) void *zero_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) size_t exit_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) pgd_t *tmp_pg_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) phys_addr_t phys_hibernate_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) void __noreturn (*hibernate_exit)(phys_addr_t, phys_addr_t, void *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) void *, phys_addr_t, phys_addr_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) * Restoring the memory image will overwrite the ttbr1 page tables.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) * Create a second copy of just the linear map, and use this when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) * restoring.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) rc = trans_pgd_create_copy(&tmp_pg_dir, PAGE_OFFSET, PAGE_END);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) * We need a zero page that is zero before & after resume in order to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) * to break before make on the ttbr1 page tables.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) zero_page = (void *)get_safe_page(GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) if (!zero_page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) pr_err("Failed to allocate zero page.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) * Locate the exit code in the bottom-but-one page, so that *NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) * still has disastrous affects.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) hibernate_exit = (void *)PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) exit_size = __hibernate_exit_text_end - __hibernate_exit_text_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) * Copy swsusp_arch_suspend_exit() to a safe page. This will generate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) * a new set of ttbr0 page tables and load them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) rc = create_safe_exec_page(__hibernate_exit_text_start, exit_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) (unsigned long)hibernate_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) &phys_hibernate_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) pr_err("Failed to create safe executable page for hibernate_exit code.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) * The hibernate exit text contains a set of el2 vectors, that will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) * be executed at el2 with the mmu off in order to reload hyp-stub.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) __flush_dcache_area(hibernate_exit, exit_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) * KASLR will cause the el2 vectors to be in a different location in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) * the resumed kernel. Load hibernate's temporary copy into el2.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) * We can skip this step if we booted at EL1, or are running with VHE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) if (el2_reset_needed()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) phys_addr_t el2_vectors = phys_hibernate_exit; /* base */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) el2_vectors += hibernate_el2_vectors -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) __hibernate_exit_text_start; /* offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) __hyp_set_vectors(el2_vectors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) hibernate_exit(virt_to_phys(tmp_pg_dir), resume_hdr.ttbr1_el1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) resume_hdr.reenter_kernel, restore_pblist,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) resume_hdr.__hyp_stub_vectors, virt_to_phys(zero_page));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) int hibernate_resume_nonboot_cpu_disable(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) if (sleep_cpu < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) pr_err("Failing to resume from hibernate on an unknown CPU.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) return freeze_secondary_cpus(sleep_cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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