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powerpc/pseries: add definitions for new H_SIGNAL_SYS_RESET hcall

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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: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2016-11-08 17:08:06 +11:00
committed by Michael Ellerman
parent 500c7ab1a9
commit 53ce299615
2 changed files with 12 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
arch/powerpc/include/asm/hvcall.h
View File

@@ -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__
/**

5
arch/powerpc/include/asm/plpar_wrappers.h
View File

@@ -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 */