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| author | Nicholas Piggin <npiggin@gmail.com> | 2017-11-29 15:37:01 +1000 |
|---|---|---|
| committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2017-12-03 22:10:55 -0600 |
| commit | 0d84ea6bda03a00a1765dd7240a9e5231a537e96 (patch) | |
| tree | f3b3b27baa34392bb77dece570087d871ae71f99 /include | |
| parent | 602c6d44a302aedb02065934ab8db57311261654 (diff) | |
| download | skiboot-0d84ea6bda03a00a1765dd7240a9e5231a537e96.zip skiboot-0d84ea6bda03a00a1765dd7240a9e5231a537e96.tar.gz skiboot-0d84ea6bda03a00a1765dd7240a9e5231a537e96.tar.bz2 | |
core: Add support for quiescing OPAL
Quiescing is ensuring all host controlled CPUs (except the current
one) are out of OPAL and prevented from entering. This can be use in
debug and shutdown paths, particularly with system reset sequences.
This patch adds per-CPU entry and exit tracking for OPAL calls, and
adds logic to "hold" or "reject" at entry time, if OPAL is quiesced.
An OPAL call is added, to expose the functionality to Linux, where it
can be used for shutdown, kexec, and before generating sreset IPIs for
debugging (so the debug code does not recurse into OPAL).
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/cpu.h | 2 | ||||
| -rw-r--r-- | include/opal-api.h | 9 | ||||
| -rw-r--r-- | include/opal-internal.h | 2 |
3 files changed, 12 insertions, 1 deletions
diff --git a/include/cpu.h b/include/cpu.h index 3d5dbd4..2804105 100644 --- a/include/cpu.h +++ b/include/cpu.h @@ -55,9 +55,11 @@ struct cpu_thread { struct trace_info *trace; uint64_t save_r1; void *icp_regs; + uint32_t in_opal_call; uint32_t lock_depth; uint32_t con_suspend; bool con_need_flush; + bool quiesce_opal_call; bool in_mcount; bool in_poller; bool in_reinit; diff --git a/include/opal-api.h b/include/opal-api.h index e058089..1c1b9cc 100644 --- a/include/opal-api.h +++ b/include/opal-api.h @@ -214,7 +214,14 @@ #define OPAL_SET_POWER_SHIFT_RATIO 155 #define OPAL_SENSOR_GROUP_CLEAR 156 #define OPAL_PCI_SET_P2P 157 -#define OPAL_LAST 157 +#define OPAL_QUIESCE 158 +#define OPAL_LAST 158 + +#define QUIESCE_HOLD 1 /* Spin all calls at entry */ +#define QUIESCE_REJECT 2 /* Fail all calls with OPAL_BUSY */ +#define QUIESCE_LOCK_BREAK 3 /* Set to ignore locks. */ +#define QUIESCE_RESUME 4 /* Un-quiesce */ +#define QUIESCE_RESUME_FAST_REBOOT 5 /* Un-quiesce, fast reboot */ /* Device tree flags */ diff --git a/include/opal-internal.h b/include/opal-internal.h index 583e999..8d3d0a1 100644 --- a/include/opal-internal.h +++ b/include/opal-internal.h @@ -61,6 +61,8 @@ extern void add_opal_node(void); (func), (nargs)) extern void __opal_register(uint64_t token, void *func, unsigned num_args); +int64_t opal_quiesce(uint32_t shutdown_type, int32_t cpu); + /* Warning: no locking at the moment, do at init time only * * XXX TODO: Add the big RCU-ish "opal API lock" to protect us here |