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- #include <linux/init.h>
- #include <linux/slab.h>
- #include <asm/cacheflush.h>
- #include <asm/idmap.h>
- #include <asm/pgalloc.h>
- #include <asm/pgtable.h>
- #include <asm/memory.h>
- #include <asm/smp_plat.h>
- #include <asm/suspend.h>
- #include <asm/tlbflush.h>
- extern int __cpu_suspend(unsigned long, int (*)(unsigned long), u32 cpuid);
- extern void cpu_resume_mmu(void);
- #ifdef CONFIG_MMU
- int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
- {
- struct mm_struct *mm = current->active_mm;
- u32 __mpidr = cpu_logical_map(smp_processor_id());
- int ret;
- if (!idmap_pgd)
- return -EINVAL;
- /*
- * Provide a temporary page table with an identity mapping for
- * the MMU-enable code, required for resuming. On successful
- * resume (indicated by a zero return code), we need to switch
- * back to the correct page tables.
- */
- ret = __cpu_suspend(arg, fn, __mpidr);
- if (ret == 0) {
- cpu_switch_mm(mm->pgd, mm);
- local_flush_bp_all();
- local_flush_tlb_all();
- }
- return ret;
- }
- #else
- int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
- {
- u32 __mpidr = cpu_logical_map(smp_processor_id());
- return __cpu_suspend(arg, fn, __mpidr);
- }
- #define idmap_pgd NULL
- #endif
- /*
- * This is called by __cpu_suspend() to save the state, and do whatever
- * flushing is required to ensure that when the CPU goes to sleep we have
- * the necessary data available when the caches are not searched.
- */
- void __cpu_suspend_save(u32 *ptr, u32 ptrsz, u32 sp, u32 *save_ptr)
- {
- u32 *ctx = ptr;
- *save_ptr = virt_to_phys(ptr);
- /* This must correspond to the LDM in cpu_resume() assembly */
- *ptr++ = virt_to_phys(idmap_pgd);
- *ptr++ = sp;
- *ptr++ = virt_to_phys(cpu_do_resume);
- cpu_do_suspend(ptr);
- flush_cache_louis();
- /*
- * flush_cache_louis does not guarantee that
- * save_ptr and ptr are cleaned to main memory,
- * just up to the Level of Unification Inner Shareable.
- * Since the context pointer and context itself
- * are to be retrieved with the MMU off that
- * data must be cleaned from all cache levels
- * to main memory using "area" cache primitives.
- */
- __cpuc_flush_dcache_area(ctx, ptrsz);
- __cpuc_flush_dcache_area(save_ptr, sizeof(*save_ptr));
- outer_clean_range(*save_ptr, *save_ptr + ptrsz);
- outer_clean_range(virt_to_phys(save_ptr),
- virt_to_phys(save_ptr) + sizeof(*save_ptr));
- }
- extern struct sleep_save_sp sleep_save_sp;
- static int cpu_suspend_alloc_sp(void)
- {
- void *ctx_ptr;
- /* ctx_ptr is an array of physical addresses */
- ctx_ptr = kcalloc(mpidr_hash_size(), sizeof(u32), GFP_KERNEL);
- if (WARN_ON(!ctx_ptr))
- return -ENOMEM;
- sleep_save_sp.save_ptr_stash = ctx_ptr;
- sleep_save_sp.save_ptr_stash_phys = virt_to_phys(ctx_ptr);
- sync_cache_w(&sleep_save_sp);
- return 0;
- }
- early_initcall(cpu_suspend_alloc_sp);
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