7574364906
NX can set the 3rd bit in CR register for XER[SO] (Summary overflow)
which is not related to paste request. The current paste function
returns failure for a successful request when this bit is set. So mask
this bit and check the proper return status.
Fixes: 2392c8c8c0 ("powerpc/powernv/vas: Define copy/paste interfaces")
Cc: stable@vger.kernel.org # v4.14+
Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
47 lines
1 KiB
C
47 lines
1 KiB
C
/*
|
|
* Copyright 2016-17 IBM Corp.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
#include <asm/ppc-opcode.h>
|
|
#include <asm/reg.h>
|
|
|
|
/*
|
|
* Copy/paste instructions:
|
|
*
|
|
* copy RA,RB
|
|
* Copy contents of address (RA) + effective_address(RB)
|
|
* to internal copy-buffer.
|
|
*
|
|
* paste RA,RB
|
|
* Paste contents of internal copy-buffer to the address
|
|
* (RA) + effective_address(RB)
|
|
*/
|
|
static inline int vas_copy(void *crb, int offset)
|
|
{
|
|
asm volatile(PPC_COPY(%0, %1)";"
|
|
:
|
|
: "b" (offset), "b" (crb)
|
|
: "memory");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int vas_paste(void *paste_address, int offset)
|
|
{
|
|
u32 cr;
|
|
|
|
cr = 0;
|
|
asm volatile(PPC_PASTE(%1, %2)";"
|
|
"mfocrf %0, 0x80;"
|
|
: "=r" (cr)
|
|
: "b" (offset), "b" (paste_address)
|
|
: "memory", "cr0");
|
|
|
|
/* We mask with 0xE to ignore SO */
|
|
return (cr >> CR0_SHIFT) & 0xE;
|
|
}
|