Date: Thu, 30 Sep 2021 11:35:05 GMT From: Leandro Lupori <luporl@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: cc8e726c85be - stable/13 - powerpc64: change CAS to support Radix MMU Message-ID: <202109301135.18UBZ5as052514@gitrepo.freebsd.org>
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The branch stable/13 has been updated by luporl: URL: https://cgit.FreeBSD.org/src/commit/?id=cc8e726c85bee3f3da0fb02c12028f2310a7ee17 commit cc8e726c85bee3f3da0fb02c12028f2310a7ee17 Author: Leandro Lupori <luporl@FreeBSD.org> AuthorDate: 2021-09-15 18:12:37 +0000 Commit: Leandro Lupori <luporl@FreeBSD.org> CommitDate: 2021-09-30 11:34:16 +0000 powerpc64: change CAS to support Radix MMU Use radix_mmu environment variable to select between Hash or Radix MMU, when performing the CAS method call. This matches kernel's behavior, by selecting Hash MMU by default and Radix if radix_mmu is not zero, to make sure that both loader and kernel always select the same MMU. The device tree is queried to detect Radix/GTSE support and to find out if CAS is supported, making the old CPU version and HV bit checks unnecessary now. Reviewed by: jhibbits Sponsored by: Instituto de Pesquisas Eldorado (eldorado.org.br) Differential Revision: https://reviews.freebsd.org/D31951 (cherry picked from commit a58abcde2c83b71e5bf19575750564f7bff78833) --- stand/powerpc/ofw/cas.c | 120 +++++++++++++++++++++++++++++------------------- 1 file changed, 74 insertions(+), 46 deletions(-) diff --git a/stand/powerpc/ofw/cas.c b/stand/powerpc/ofw/cas.c index 96d276386b71..4f36a147f36d 100644 --- a/stand/powerpc/ofw/cas.c +++ b/stand/powerpc/ofw/cas.c @@ -29,6 +29,13 @@ __FBSDID("$FreeBSD$"); #include <openfirm.h> #include <stand.h> +/* #define CAS_DEBUG */ +#ifdef CAS_DEBUG +#define DPRINTF(fmt, ...) printf(fmt, ## __VA_ARGS__) +#else +#define DPRINTF(fmt, ...) do { ; } while (0) +#endif + /* PVR */ #define PVR_CPU_P8E 0x004b0000 #define PVR_CPU_P8NVL 0x004c0000 @@ -83,13 +90,19 @@ __FBSDID("$FreeBSD$"); #define OV5_INTC_XICS 0 /* byte 24: MMU */ +#define OV5_MMU_INDEX 24 #define OV5_MMU_HPT 0 +#define OV5_MMU_RADIX 0x40 +#define OV5_MMU_EITHER 0x80 +#define OV5_MMU_DYNAMIC 0xc0 /* byte 25: HPT MMU Extensions */ -#define OV5_HPT_EXT_NONE 0 +#define OV5_HPT_EXT_INDEX 25 +#define OV5_HPT_GTSE 0x40 /* byte 26: Radix MMU Extensions */ -#define OV5_RPT_EXT_NONE 0 +#define OV5_RADIX_EXT_INDEX 26 +#define OV5_RADIX_GTSE 0x40 struct pvr { @@ -163,69 +176,84 @@ static struct ibm_arch_vec { 0, /* DRMEM_V2 */ OV5_INTC_XICS, OV5_MMU_HPT, - OV5_HPT_EXT_NONE, - OV5_RPT_EXT_NONE + 0, + 0 } }; -static __inline register_t -mfpvr(void) -{ - register_t value; - - __asm __volatile ("mfpvr %0" : "=r"(value)); - - return (value); -} - -static __inline int -ppc64_hv(void) -{ - int hv; - - /* PSL_HV is bit 3 of 64-bit MSR */ - __asm __volatile ("mfmsr %0\n\t" - "rldicl %0,%0,4,63" : "=r"(hv)); - - return (hv); -} - int ppc64_cas(void) { - int rc; - ihandle_t ihandle; + phandle_t pkg; + ihandle_t inst; cell_t err; + uint8_t buf[16], idx, val; + int i, len, rc, radix_mmu; + const char *var; + char *ov5; + + pkg = OF_finddevice("/chosen"); + if (pkg == -1) { + printf("cas: couldn't find /chosen\n"); + return (-1); + } + + len = OF_getprop(pkg, "ibm,arch-vec-5-platform-support", buf, + sizeof(buf)); + if (len == -1) + /* CAS not supported */ + return (0); - /* Perform CAS only for POWER8 and later cores */ - switch (mfpvr() & PVR_CPU_MASK) { - case PVR_CPU_P8: - case PVR_CPU_P8E: - case PVR_CPU_P8NVL: - case PVR_CPU_P9: + radix_mmu = 0; + ov5 = ibm_arch_vec.vec5.data; + for (i = 0; i < len; i += 2) { + idx = buf[i]; + val = buf[i + 1]; + DPRINTF("idx 0x%02x val 0x%02x\n", idx, val); + + switch (idx) { + case OV5_MMU_INDEX: + /* + * Note that testing for OV5_MMU_RADIX/OV5_MMU_EITHER + * also covers OV5_MMU_DYNAMIC. + */ + if ((val & OV5_MMU_RADIX) || (val & OV5_MMU_EITHER)) + radix_mmu = 1; break; + + case OV5_RADIX_EXT_INDEX: + if (val & OV5_RADIX_GTSE) + ov5[idx] = OV5_RADIX_GTSE; + break; + + case OV5_HPT_EXT_INDEX: default: - return (0); + break; + } } - /* Skip CAS when running on PowerNV */ - if (ppc64_hv()) - return (0); + if (radix_mmu && (var = getenv("radix_mmu")) != NULL && var[0] != '0') + ov5[OV5_MMU_INDEX] = OV5_MMU_RADIX; + else + radix_mmu = 0; - ihandle = OF_open("/"); - if (ihandle == -1) { + inst = OF_open("/"); + if (inst == -1) { printf("cas: failed to open / node\n"); return (-1); } - if (rc = OF_call_method("ibm,client-architecture-support", - 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); + DPRINTF("MMU 0x%02x RADIX_EXT 0x%02x\n", + ov5[OV5_MMU_INDEX], ov5[OV5_RADIX_EXT_INDEX]); + rc = OF_call_method("ibm,client-architecture-support", + inst, 1, 1, &ibm_arch_vec, &err); + if (rc != 0 || err) { + printf("cas: CAS method returned an error: rc %d err %jd\n", + rc, (intmax_t)err); rc = -1; } - OF_close(ihandle); + OF_close(inst); + printf("cas: selected %s MMU\n", radix_mmu ? "radix" : "hash"); return (rc); }
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