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stand/powerpc/ofw/cas.c
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/*- | |||||
* Copyright (c) 2019 Leandro Lupori | |||||
* | |||||
* Redistribution and use in source and binary forms, with or without | |||||
* modification, are permitted provided that the following conditions | |||||
* are met: | |||||
* 1. Redistributions of source code must retain the above copyright | |||||
* notice, this list of conditions and the following disclaimer. | |||||
* 2. Redistributions in binary form must reproduce the above copyright | |||||
* notice, this list of conditions and the following disclaimer in the | |||||
* documentation and/or other materials provided with the distribution. | |||||
* | |||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND | |||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||||
* SUCH DAMAGE. | |||||
*/ | |||||
#include <sys/cdefs.h> | |||||
__FBSDID("$FreeBSD$"); | |||||
#include <openfirm.h> | |||||
#include <stand.h> | |||||
/* PVR */ | |||||
#define PVR_VER_P8E 0x004b0000 | |||||
#define PVR_VER_P8NVL 0x004c0000 | |||||
#define PVR_VER_P8 0x004d0000 | |||||
#define PVR_VER_P9 0x004e0000 | |||||
#define PVR_VER_MASK 0xffff0000 | |||||
/* loader version of kernel's CPU_MAXSIZE */ | |||||
#define MAX_CPUS ((uint32_t)256u) | |||||
/* Option Vectors' settings */ | |||||
/* length of ignored OV */ | |||||
#define OV_IGN_LEN 0 | |||||
/* byte 1 (of any OV) */ | |||||
#define OV_IGN 0x80 | |||||
/* Option Vector 5 */ | |||||
/* byte 2 */ | |||||
#define OV5_LPAR 0x80 | |||||
#define OV5_SPLPAR 0x40 | |||||
#define OV5_DRMEM 0x20 | |||||
#define OV5_LP 0x10 | |||||
#define OV5_ALPHA_PART 0x08 | |||||
#define OV5_DMA_DELAY 0x04 | |||||
#define OV5_DONATE_CPU 0x02 | |||||
#define OV5_MSI 0x01 | |||||
/* 9-12: max cpus */ | |||||
#define OV5_MAX_CPUS(n) ((MAX_CPUS >> (3*8 - (n)*8)) & 0xff) | |||||
/* 13-14: LoPAPR Level */ | |||||
#define LOPAPR_LEVEL 0x0101 /* 1.1 */ | |||||
#define OV5_LOPAPR_LEVEL(n) ((LOPAPR_LEVEL >> (8 - (n)*8)) & 0xff) | |||||
/* byte 17: Platform Facilities */ | |||||
#define OV5_RNG 0x80 | |||||
#define OV5_COMP_ENG 0x40 | |||||
#define OV5_ENC_ENG 0x20 | |||||
/* byte 21: Sub-Processors */ | |||||
#define OV5_NO_SUBPROCS 0 | |||||
#define OV5_SUBPROCS 1 | |||||
/* byte 23: interrupt controller */ | |||||
#define OV5_INTC_XICS 0 | |||||
/* byte 24: MMU */ | |||||
#define OV5_MMU_HPT 0 | |||||
/* byte 25: HPT MMU Extensions */ | |||||
#define OV5_HPT_EXT_NONE 0 | |||||
/* byte 26: Radix MMU Extensions */ | |||||
#define OV5_RPT_EXT_NONE 0 | |||||
struct pvr { | |||||
uint32_t mask; | |||||
uint32_t val; | |||||
}; | |||||
struct opt_vec_ignore { | |||||
char data[2]; | |||||
} __packed; | |||||
struct opt_vec4 { | |||||
char data[3]; | |||||
} __packed; | |||||
struct opt_vec5 { | |||||
char data[27]; | |||||
} __packed; | |||||
static struct ibm_arch_vec { | |||||
struct pvr pvr_list[5]; | |||||
uint8_t num_opts; | |||||
struct opt_vec_ignore vec1; | |||||
struct opt_vec_ignore vec2; | |||||
struct opt_vec_ignore vec3; | |||||
struct opt_vec4 vec4; | |||||
struct opt_vec5 vec5; | |||||
} __packed ibm_arch_vec = { | |||||
/* pvr_list */ { | |||||
{ PVR_VER_MASK, PVR_VER_P8 }, /* POWER8 */ | |||||
{ PVR_VER_MASK, PVR_VER_P8E }, /* POWER8E */ | |||||
{ PVR_VER_MASK, PVR_VER_P8NVL }, /* POWER8NVL */ | |||||
{ PVR_VER_MASK, PVR_VER_P9 }, /* POWER9 */ | |||||
{ 0, 0xffffffffu } /* terminator */ | |||||
}, | |||||
4, /* num_opts (4 actually means 5 option vectors) */ | |||||
{ OV_IGN_LEN, OV_IGN }, /* OV1 */ | |||||
{ OV_IGN_LEN, OV_IGN }, /* OV2 */ | |||||
{ OV_IGN_LEN, OV_IGN }, /* OV3 */ | |||||
/* OV4 (can't be ignored) */ { | |||||
sizeof(struct opt_vec4) - 2, /* length (n-2) */ | |||||
0, | |||||
10 /* Minimum VP entitled capacity percentage * 100 | |||||
* (if absent assume 10%) */ | |||||
}, | |||||
/* OV5 */ { | |||||
sizeof(struct opt_vec5) - 2, /* length (n-2) */ | |||||
0, /* don't ignore */ | |||||
OV5_LPAR | OV5_SPLPAR | OV5_LP | OV5_MSI, | |||||
0, | |||||
0, /* Cooperative Memory Over-commitment */ | |||||
0, /* Associativity Information Option */ | |||||
0, /* Binary Option Controls */ | |||||
0, /* Reserved */ | |||||
0, /* Reserved */ | |||||
OV5_MAX_CPUS(0), | |||||
OV5_MAX_CPUS(1), /* 10 */ | |||||
OV5_MAX_CPUS(2), | |||||
OV5_MAX_CPUS(3), | |||||
OV5_LOPAPR_LEVEL(0), | |||||
OV5_LOPAPR_LEVEL(1), | |||||
0, /* Reserved */ | |||||
0, /* Reserved */ | |||||
0, /* Platform Facilities */ | |||||
0, /* Reserved */ | |||||
0, /* Reserved */ | |||||
0, /* Reserved */ /* 20 */ | |||||
OV5_NO_SUBPROCS, | |||||
0, /* DRMEM_V2 */ | |||||
OV5_INTC_XICS, | |||||
OV5_MMU_HPT, | |||||
OV5_HPT_EXT_NONE, | |||||
OV5_RPT_EXT_NONE | |||||
} | |||||
}; | |||||
static __inline register_t | |||||
mfpvr(void) | |||||
{ | |||||
register_t value; | |||||
__asm __volatile ("mfpvr %0" : "=r"(value)); | |||||
return (value); | |||||
} | |||||
int | |||||
ppc64_cas(void) | |||||
{ | |||||
int rc; | |||||
ihandle_t ihandle; | |||||
cell_t err; | |||||
/* Perform CAS only for POWER8 and later cores */ | |||||
jhibbits: Can you use machine/psl.h and machine/cpufunc.h? Then you can use 'uint64_t hv = mfmsrd() &… | |||||
Done Inline ActionsOk, I'll give it a try and see if works. luporl: Ok, I'll give it a try and see if works. | |||||
Done Inline ActionsIt doesn't work, as doing so raises a couple of issues. The first issue is that stand is 32-bit, so __powerpc64__ is not defined and would need to be defined manually to get the right contents from psl.h and cpufunc.h. The second issue is that the needed contents are protected by an "#ifdef _KERNEL", needing to define it manually to make it work. The third issue, that I haven't investigate deeper, is that register_t ends up being defined as a 32-bit integer, which truncates the value returned by mfmsr(), resulting in wrong code that will test a bit that will always be 0. So in summary it seems that, at least currently, it is not possible to reuse cpufunc.h and psl.h in stand. luporl: It doesn't work, as doing so raises a couple of issues.
The first issue is that stand is 32… | |||||
switch (mfpvr() & PVR_VER_MASK) { | |||||
case PVR_VER_P8: | |||||
case PVR_VER_P8E: | |||||
case PVR_VER_P8NVL: | |||||
case PVR_VER_P9: | |||||
break; | |||||
default: | |||||
return (0); | |||||
} | |||||
ihandle = OF_open("/"); | |||||
if (ihandle == -1) { | |||||
printf("cas: failed to open / node\n"); | |||||
return (-1); | |||||
} | |||||
if (rc = OF_call_method("ibm,client-architecture-support", | |||||
jhibbitsUnsubmitted Done Inline ActionsWould this prevent loader from being used on powernv? I know currently we don't boot with loader on POWER8 and POWER9, but that may change in the future. jhibbits: Would this prevent loader from being used on powernv? I know currently we don't boot with… | |||||
luporlAuthorUnsubmitted Done Inline ActionsYes, it would. luporl: Yes, it would.
What if I add a check for PSL_HV bit and skip CAS if it is set? Kernel code… | |||||
jhibbitsUnsubmitted Done Inline ActionsThat should work, I think. jhibbits: That should work, I think. | |||||
luporlAuthorUnsubmitted Done Inline ActionsHV bit test added. I've confirmed it works on pseries. luporl: HV bit test added. I've confirmed it works on pseries. | |||||
ihandle, 1, 1, &ibm_arch_vec, &err)) | |||||
printf("cas: failed to call CAS method\n"); | |||||
else if (err) { | |||||
printf("cas: error: 0x%08lX\n", err); | |||||
rc = -1; | |||||
} | |||||
OF_close(ihandle); | |||||
return (rc); | |||||
} |
Can you use machine/psl.h and machine/cpufunc.h? Then you can use 'uint64_t hv = mfmsrd() & PSL_SF; return (hv != 0);'