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ppc/spapr: Implement H_WATCHDOG

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The new PAPR 2.12 defines a watchdog facility managed via the new
H_WATCHDOG hypercall.

This adds H_WATCHDOG support which a proposed driver for pseries uses:
https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=303120

This was tested by running QEMU with a debug kernel and command line:
-append \
 "pseries-wdt.timeout=60 pseries-wdt.nowayout=1 pseries-wdt.action=2"

and running "echo V > /dev/watchdog0" inside the VM.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20220622051008.1067464-1-aik@ozlabs.ru>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Alexey Kardashevskiy 2022-06-22 15:10:08 +10:00 • committed by Daniel Henrique Barboza
parent 95444afcab
commit 81b205cecf
5 changed files with 310 additions and 1 deletions
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25
include/hw/ppc/spapr.h
View file

@ -164,6 +164,21 @@ struct SpaprMachineClass {
SpaprIrq *irq;
};
#define WDT_MAX_WATCHDOGS 4 /* Maximum number of watchdog devices */
#define TYPE_SPAPR_WDT "spapr-wdt"
OBJECT_DECLARE_SIMPLE_TYPE(SpaprWatchdog, SPAPR_WDT)
typedef struct SpaprWatchdog {
/*< private >*/
DeviceState parent_obj;
/*< public >*/
QEMUTimer timer;
uint8_t action; /* One of PSERIES_WDTF_ACTION_xxx */
uint8_t leave_others; /* leaveOtherWatchdogsRunningOnTimeout */
} SpaprWatchdog;
/**
* SpaprMachineState:
*/
@ -264,6 +279,8 @@ struct SpaprMachineState {
uint32_t FORM2_assoc_array[NUMA_NODES_MAX_NUM][FORM2_NUMA_ASSOC_SIZE];
Error *fwnmi_migration_blocker;
SpaprWatchdog wds[WDT_MAX_WATCHDOGS];
};
#define H_SUCCESS 0
@ -344,6 +361,7 @@ struct SpaprMachineState {
#define H_P7 -60
#define H_P8 -61
#define H_P9 -62
#define H_NOOP -63
#define H_UNSUPPORTED -67
#define H_OVERLAP -68
#define H_UNSUPPORTED_FLAG -256
@ -564,8 +582,9 @@ struct SpaprMachineState {
#define H_SCM_HEALTH 0x400
#define H_RPT_INVALIDATE 0x448
#define H_SCM_FLUSH 0x44C
#define H_WATCHDOG 0x45C
#define MAX_HCALL_OPCODE H_SCM_FLUSH
#define MAX_HCALL_OPCODE H_WATCHDOG
/* The hcalls above are standardized in PAPR and implemented by pHyp
* as well.
@ -1028,6 +1047,7 @@ extern const VMStateDescription vmstate_spapr_cap_large_decr;
extern const VMStateDescription vmstate_spapr_cap_ccf_assist;
extern const VMStateDescription vmstate_spapr_cap_fwnmi;
extern const VMStateDescription vmstate_spapr_cap_rpt_invalidate;
extern const VMStateDescription vmstate_spapr_wdt;
static inline uint8_t spapr_get_cap(SpaprMachineState *spapr, int cap)
{
@ -1064,4 +1084,7 @@ target_ulong spapr_vof_client_architecture_support(MachineState *ms,
target_ulong ovec_addr);
void spapr_vof_client_dt_finalize(SpaprMachineState *spapr, void *fdt);
/* H_WATCHDOG */
void spapr_watchdog_init(SpaprMachineState *spapr);
#endif /* HW_SPAPR_H */