arch/powerpc/include/asm/cpuidle.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_POWERPC_CPUIDLE_H
   3 #define _ASM_POWERPC_CPUIDLE_H
   4
   5 #ifdef CONFIG_PPC_POWERNV
   6 /* Thread state used in powernv idle state management */
   7 #define PNV_THREAD_RUNNING              0
   8 #define PNV_THREAD_NAP                  1
   9 #define PNV_THREAD_SLEEP                2
  10 #define PNV_THREAD_WINKLE               3
  11
  12 /*
  13  * Core state used in powernv idle for POWER8.
  14  *
  15  * The lock bit synchronizes updates to the state, as well as parts of the
  16  * sleep/wake code (see kernel/idle_book3s.S).
  17  *
  18  * Bottom 8 bits track the idle state of each thread. Bit is cleared before
  19  * the thread executes an idle instruction (nap/sleep/winkle).
  20  *
  21  * Then there is winkle tracking. A core does not lose complete state
  22  * until every thread is in winkle. So the winkle count field counts the
  23  * number of threads in winkle (small window of false positives is okay
  24  * around the sleep/wake, so long as there are no false negatives).
  25  *
  26  * When the winkle count reaches 8 (the COUNT_ALL_BIT becomes set), then
  27  * the THREAD_WINKLE_BITS are set, which indicate which threads have not
  28  * yet woken from the winkle state.
  29  */
  30 #define PNV_CORE_IDLE_LOCK_BIT                  0x10000000
  31
  32 #define PNV_CORE_IDLE_WINKLE_COUNT              0x00010000
  33 #define PNV_CORE_IDLE_WINKLE_COUNT_ALL_BIT      0x00080000
  34 #define PNV_CORE_IDLE_WINKLE_COUNT_BITS         0x000F0000
  35 #define PNV_CORE_IDLE_THREAD_WINKLE_BITS_SHIFT  8
  36 #define PNV_CORE_IDLE_THREAD_WINKLE_BITS        0x0000FF00
  37
  38 #define PNV_CORE_IDLE_THREAD_BITS               0x000000FF
  39
  40 /*
  41  * ============================ NOTE =================================
  42  * The older firmware populates only the RL field in the psscr_val and
  43  * sets the psscr_mask to 0xf. On such a firmware, the kernel sets the
  44  * remaining PSSCR fields to default values as follows:
  45  *
  46  * - ESL and EC bits are to 1. So wakeup from any stop state will be
  47  *   at vector 0x100.
  48  *
  49  * - MTL and PSLL are set to the maximum allowed value as per the ISA,
  50  *    i.e. 15.
  51  *
  52  * - The Transition Rate, TR is set to the Maximum value 3.
  53  */
  54 #define PSSCR_HV_DEFAULT_VAL    (PSSCR_ESL | PSSCR_EC |             \
  55                                 PSSCR_PSLL_MASK | PSSCR_TR_MASK |   \
  56                                 PSSCR_MTL_MASK)
  57
  58 #define PSSCR_HV_DEFAULT_MASK   (PSSCR_ESL | PSSCR_EC |             \
  59                                 PSSCR_PSLL_MASK | PSSCR_TR_MASK |   \
  60                                 PSSCR_MTL_MASK | PSSCR_RL_MASK)
  61 #define PSSCR_EC_SHIFT    20
  62 #define PSSCR_ESL_SHIFT   21
  63 #define GET_PSSCR_EC(x)   (((x) & PSSCR_EC) >> PSSCR_EC_SHIFT)
  64 #define GET_PSSCR_ESL(x)  (((x) & PSSCR_ESL) >> PSSCR_ESL_SHIFT)
  65 #define GET_PSSCR_RL(x)   ((x) & PSSCR_RL_MASK)
  66
  67 #define ERR_EC_ESL_MISMATCH             -1
  68 #define ERR_DEEP_STATE_ESL_MISMATCH     -2
  69
  70 #ifndef __ASSEMBLY__
  71 /* Additional SPRs that need to be saved/restored during stop */
  72 struct stop_sprs {
  73         u64 pid;
  74         u64 ldbar;
  75         u64 fscr;
  76         u64 hfscr;
  77         u64 mmcr1;
  78         u64 mmcr2;
  79         u64 mmcra;
  80 };
  81
  82 extern u32 pnv_fastsleep_workaround_at_entry[];
  83 extern u32 pnv_fastsleep_workaround_at_exit[];
  84
  85 extern u64 pnv_first_deep_stop_state;
  86
  87 unsigned long pnv_cpu_offline(unsigned int cpu);
  88 int validate_psscr_val_mask(u64 *psscr_val, u64 *psscr_mask, u32 flags);
  89 static inline void report_invalid_psscr_val(u64 psscr_val, int err)
  90 {
  91         switch (err) {
  92         case ERR_EC_ESL_MISMATCH:
  93                 pr_warn("Invalid psscr 0x%016llx : ESL,EC bits unequal",
  94                         psscr_val);
  95                 break;
  96         case ERR_DEEP_STATE_ESL_MISMATCH:
  97                 pr_warn("Invalid psscr 0x%016llx : ESL cleared for deep stop-state",
  98                         psscr_val);
  99         }
 100 }
 101 #endif
 102
 103 #endif
 104
 105 #endif