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122 lines
3.1 KiB
122 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/ftrace.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/mm_types.h> |
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#include <linux/pgtable.h> |
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#include <asm/bugs.h> |
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#include <asm/cacheflush.h> |
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#include <asm/idmap.h> |
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#include <asm/memory.h> |
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#include <asm/smp_plat.h> |
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#include <asm/suspend.h> |
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#include <asm/tlbflush.h> |
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extern int __cpu_suspend(unsigned long, int (*)(unsigned long), u32 cpuid); |
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extern void cpu_resume_mmu(void); |
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#ifdef CONFIG_MMU |
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int cpu_suspend(unsigned long arg, int (*fn)(unsigned long)) |
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{ |
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struct mm_struct *mm = current->active_mm; |
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u32 __mpidr = cpu_logical_map(smp_processor_id()); |
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int ret; |
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if (!idmap_pgd) |
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return -EINVAL; |
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/* |
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* Function graph tracer state gets incosistent when the kernel |
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* calls functions that never return (aka suspend finishers) hence |
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* disable graph tracing during their execution. |
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*/ |
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pause_graph_tracing(); |
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/* |
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* Provide a temporary page table with an identity mapping for |
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* the MMU-enable code, required for resuming. On successful |
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* resume (indicated by a zero return code), we need to switch |
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* back to the correct page tables. |
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*/ |
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ret = __cpu_suspend(arg, fn, __mpidr); |
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unpause_graph_tracing(); |
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if (ret == 0) { |
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cpu_switch_mm(mm->pgd, mm); |
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local_flush_bp_all(); |
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local_flush_tlb_all(); |
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check_other_bugs(); |
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} |
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return ret; |
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} |
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#else |
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int cpu_suspend(unsigned long arg, int (*fn)(unsigned long)) |
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{ |
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u32 __mpidr = cpu_logical_map(smp_processor_id()); |
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int ret; |
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pause_graph_tracing(); |
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ret = __cpu_suspend(arg, fn, __mpidr); |
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unpause_graph_tracing(); |
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return ret; |
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} |
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#define idmap_pgd NULL |
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#endif |
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/* |
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* This is called by __cpu_suspend() to save the state, and do whatever |
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* flushing is required to ensure that when the CPU goes to sleep we have |
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* the necessary data available when the caches are not searched. |
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*/ |
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void __cpu_suspend_save(u32 *ptr, u32 ptrsz, u32 sp, u32 *save_ptr) |
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{ |
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u32 *ctx = ptr; |
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*save_ptr = virt_to_phys(ptr); |
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/* This must correspond to the LDM in cpu_resume() assembly */ |
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*ptr++ = virt_to_phys(idmap_pgd); |
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*ptr++ = sp; |
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*ptr++ = virt_to_phys(cpu_do_resume); |
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cpu_do_suspend(ptr); |
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flush_cache_louis(); |
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/* |
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* flush_cache_louis does not guarantee that |
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* save_ptr and ptr are cleaned to main memory, |
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* just up to the Level of Unification Inner Shareable. |
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* Since the context pointer and context itself |
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* are to be retrieved with the MMU off that |
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* data must be cleaned from all cache levels |
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* to main memory using "area" cache primitives. |
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*/ |
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__cpuc_flush_dcache_area(ctx, ptrsz); |
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__cpuc_flush_dcache_area(save_ptr, sizeof(*save_ptr)); |
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outer_clean_range(*save_ptr, *save_ptr + ptrsz); |
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outer_clean_range(virt_to_phys(save_ptr), |
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virt_to_phys(save_ptr) + sizeof(*save_ptr)); |
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} |
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extern struct sleep_save_sp sleep_save_sp; |
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static int cpu_suspend_alloc_sp(void) |
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{ |
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void *ctx_ptr; |
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/* ctx_ptr is an array of physical addresses */ |
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ctx_ptr = kcalloc(mpidr_hash_size(), sizeof(u32), GFP_KERNEL); |
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if (WARN_ON(!ctx_ptr)) |
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return -ENOMEM; |
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sleep_save_sp.save_ptr_stash = ctx_ptr; |
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sleep_save_sp.save_ptr_stash_phys = virt_to_phys(ctx_ptr); |
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sync_cache_w(&sleep_save_sp); |
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return 0; |
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} |
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early_initcall(cpu_suspend_alloc_sp);
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