Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm64 / kernel / suspend.c

diff --git a/kernel/arch/arm64/kernel/suspend.c b/kernel/arch/arm64/kernel/suspend.c
new file mode 100644 (file)
index 0000000..d7daf45
--- /dev/null
+++ b/kernel/arch/arm64/kernel/suspend.c
@@ -0,0 +1,141 @@
+#include <linux/percpu.h>
+#include <linux/slab.h>
+#include <asm/cacheflush.h>
+#include <asm/debug-monitors.h>
+#include <asm/pgtable.h>
+#include <asm/memory.h>
+#include <asm/mmu_context.h>
+#include <asm/smp_plat.h>
+#include <asm/suspend.h>
+#include <asm/tlbflush.h>
+
+extern int __cpu_suspend_enter(unsigned long arg, int (*fn)(unsigned long));
+/*
+ * This is called by __cpu_suspend_enter() 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.
+ *
+ * ptr: CPU context virtual address
+ * save_ptr: address of the location where the context physical address
+ *           must be saved
+ */
+void notrace __cpu_suspend_save(struct cpu_suspend_ctx *ptr,
+                               phys_addr_t *save_ptr)
+{
+       *save_ptr = virt_to_phys(ptr);
+
+       cpu_do_suspend(ptr);
+       /*
+        * Only flush the context that must be retrieved with the MMU
+        * off. VA primitives ensure the flush is applied to all
+        * cache levels so context is pushed to DRAM.
+        */
+       __flush_dcache_area(ptr, sizeof(*ptr));
+       __flush_dcache_area(save_ptr, sizeof(*save_ptr));
+}
+
+/*
+ * This hook is provided so that cpu_suspend code can restore HW
+ * breakpoints as early as possible in the resume path, before reenabling
+ * debug exceptions. Code cannot be run from a CPU PM notifier since by the
+ * time the notifier runs debug exceptions might have been enabled already,
+ * with HW breakpoints registers content still in an unknown state.
+ */
+void (*hw_breakpoint_restore)(void *);
+void __init cpu_suspend_set_dbg_restorer(void (*hw_bp_restore)(void *))
+{
+       /* Prevent multiple restore hook initializations */
+       if (WARN_ON(hw_breakpoint_restore))
+               return;
+       hw_breakpoint_restore = hw_bp_restore;
+}
+
+/*
+ * __cpu_suspend
+ *
+ * arg: argument to pass to the finisher function
+ * fn: finisher function pointer
+ *
+ */
+int __cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
+{
+       struct mm_struct *mm = current->active_mm;
+       int ret;
+       unsigned long flags;
+
+       /*
+        * From this point debug exceptions are disabled to prevent
+        * updates to mdscr register (saved and restored along with
+        * general purpose registers) from kernel debuggers.
+        */
+       local_dbg_save(flags);
+
+       /*
+        * mm context saved on the stack, it will be restored when
+        * the cpu comes out of reset through the identity mapped
+        * page tables, so that the thread address space is properly
+        * set-up on function return.
+        */
+       ret = __cpu_suspend_enter(arg, fn);
+       if (ret == 0) {
+               /*
+                * We are resuming from reset with TTBR0_EL1 set to the
+                * idmap to enable the MMU; restore the active_mm mappings in
+                * TTBR0_EL1 unless the active_mm == &init_mm, in which case
+                * the thread entered __cpu_suspend with TTBR0_EL1 set to
+                * reserved TTBR0 page tables and should be restored as such.
+                */
+               if (mm == &init_mm)
+                       cpu_set_reserved_ttbr0();
+               else
+                       cpu_switch_mm(mm->pgd, mm);
+
+               flush_tlb_all();
+
+               /*
+                * Restore per-cpu offset before any kernel
+                * subsystem relying on it has a chance to run.
+                */
+               set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
+
+               /*
+                * Restore HW breakpoint registers to sane values
+                * before debug exceptions are possibly reenabled
+                * through local_dbg_restore.
+                */
+               if (hw_breakpoint_restore)
+                       hw_breakpoint_restore(NULL);
+       }
+
+       /*
+        * Restore pstate flags. OS lock and mdscr have been already
+        * restored, so from this point onwards, debugging is fully
+        * renabled if it was enabled when core started shutdown.
+        */
+       local_dbg_restore(flags);
+
+       return ret;
+}
+
+struct sleep_save_sp sleep_save_sp;
+phys_addr_t sleep_idmap_phys;
+
+static int __init cpu_suspend_init(void)
+{
+       void *ctx_ptr;
+
+       /* ctx_ptr is an array of physical addresses */
+       ctx_ptr = kcalloc(mpidr_hash_size(), sizeof(phys_addr_t), 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);
+       sleep_idmap_phys = virt_to_phys(idmap_pg_dir);
+       __flush_dcache_area(&sleep_save_sp, sizeof(struct sleep_save_sp));
+       __flush_dcache_area(&sleep_idmap_phys, sizeof(sleep_idmap_phys));
+
+       return 0;
+}
+early_initcall(cpu_suspend_init);