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Commit 53ce2996 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
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powerpc/pseries: add definitions for new H_SIGNAL_SYS_RESET hcall 



This has not made its way to a PAPR release yet, but we have an hcall
number assigned.

  H_SIGNAL_SYS_RESET = 0x380

  Syntax:
    hcall(uint64 H_SIGNAL_SYS_RESET, int64 target);

  Generate a system reset NMI on the threads indicated by target.

  Values for target:
    -1 = target all online threads including the caller
    -2 = target all online threads except for the caller
    All other negative values: reserved
    Positive values: The thread to be targeted, obtained from the value
    of the "ibm,ppc-interrupt-server#s" property of the CPU in the OF
    device tree.

  Semantics:
  - Invalid target: return H_Parameter.
  - Otherwise: Generate a system reset NMI on target thread(s),
    return H_Success.

This will be used by crash/debug code to get stuck CPUs into a known
state.

Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 500c7ab1

arch/powerpc/include/asm/hvcall.h

+7 −1
Original line number Diff line number Diff line
@@ -276,7 +276,8 @@ 
#define H_GET_MPP_X		0x314

#define H_SET_MODE		0x31C

#define H_CLEAR_HPT		0x358

#define MAX_HCALL_OPCODE	H_CLEAR_HPT

#define H_SIGNAL_SYS_RESET	0x380

#define MAX_HCALL_OPCODE	H_SIGNAL_SYS_RESET



/* H_VIOCTL functions */

#define H_GET_VIOA_DUMP_SIZE	0x01
@@ -307,6 +308,11 @@ 
#define H_SET_MODE_RESOURCE_ADDR_TRANS_MODE	3

#define H_SET_MODE_RESOURCE_LE			4



/* Values for argument to H_SIGNAL_SYS_RESET */

#define H_SIGNAL_SYS_RESET_ALL			-1

#define H_SIGNAL_SYS_RESET_ALL_OTHERS		-2

/* >= 0 values are CPU number */



#ifndef __ASSEMBLY__



/**

arch/powerpc/include/asm/plpar_wrappers.h

+5 −0
Original line number Diff line number Diff line
@@ -308,4 +308,9 @@ static inline long plapr_set_watchpoint0(unsigned long dawr0, unsigned long dawr 
	return plpar_set_mode(0, H_SET_MODE_RESOURCE_SET_DAWR, dawr0, dawrx0);

}



static inline long plapr_signal_sys_reset(long cpu)

{

	return plpar_hcall_norets(H_SIGNAL_SYS_RESET, cpu);

}



#endif /* _ASM_POWERPC_PLPAR_WRAPPERS_H */