git: ff9c290648df - stable/14 - powernv: Explicitly enable the facilities we support

The branch stable/14 has been updated by jhibbits:

URL: https://cgit.FreeBSD.org/src/commit/?id=ff9c290648dfd36e6cd8850ec9d79aad88a10d84

commit ff9c290648dfd36e6cd8850ec9d79aad88a10d84
Author:     Justin Hibbits <jhibbits@FreeBSD.org>
AuthorDate: 2025-03-19 22:25:40 +0000
Commit:     Justin Hibbits <jhibbits@FreeBSD.org>
CommitDate: 2025-03-28 02:32:20 +0000

    powernv: Explicitly enable the facilities we support
    
    Thus far we've relied on the firmware setting HFSCR correctly, enabling
    all facilities.  However, it appears some recent firmwares do not.
    Linux explicitly enables all facilities it supports (including
    transactional memory, which new firmwares apparently do not enable), so
    do the same here, explicitly enable all the facilities FreeBSD supports.
    
    MFC after:      1 week
    
    (cherry picked from commit fe73eb441f1c98fe350f4822c7d2abfeef046bf8)
---
 sys/powerpc/include/spr.h              | 5 +++++
 sys/powerpc/powernv/platform_powernv.c | 6 ++++++
 2 files changed, 11 insertions(+)

diff --git a/sys/powerpc/include/spr.h b/sys/powerpc/include/spr.h
index 5bb3858b0fb5..605b1be194d9 100644
--- a/sys/powerpc/include/spr.h
+++ b/sys/powerpc/include/spr.h
@@ -162,6 +162,11 @@
 #define	  FSCR_DSCR		  0x0000000000000004 /* DSCR available in PR state */
 #define	SPR_UAMOR		0x09d	/* User Authority Mask Override Register */
 #define	SPR_DPDES		0x0b0	/* .6. Directed Privileged Doorbell Exception State Register */
+#define	SPR_HFSCR		0xbe	/* Hypervisor Facility Status and Control Register */
+#define	  HFSCR_BHRB		  0x0000000000000010 /* BHRB instructions */
+#define	  HFSCR_PM		  0x0000000000000008 /* Performance monitor SPRs */
+#define	  HFSCR_VECVSX		  0x0000000000000002 /* Vector and VSX facilities */
+#define	  HFSCR_FP		  0x0000000000000001 /* Floating Point facility */
 #define	SPR_USPRG0		0x100	/* 4.8 User SPR General 0 */
 #define	SPR_VRSAVE		0x100	/* .6. AltiVec VRSAVE */
 #define	SPR_SPRG0		0x110	/* 468 SPR General 0 */
diff --git a/sys/powerpc/powernv/platform_powernv.c b/sys/powerpc/powernv/platform_powernv.c
index e9babc128af0..cf5249313880 100644
--- a/sys/powerpc/powernv/platform_powernv.c
+++ b/sys/powerpc/powernv/platform_powernv.c
@@ -139,6 +139,7 @@ powernv_attach(platform_t plat)
 	phandle_t opal;
 	int res, len, idx;
 	register_t msr;
+	register_t fscr;
 	bool has_lp;
 
 	/* Ping OPAL again just to make sure */
@@ -180,6 +181,11 @@ powernv_attach(platform_t plat)
 	mtspr(SPR_LPCR, lpcr);
 	isync();
 
+	fscr = mfspr(SPR_HFSCR);
+	fscr |= FSCR_TAR | FSCR_EBB | HFSCR_BHRB | HFSCR_PM |
+	    HFSCR_VECVSX | HFSCR_FP | FSCR_MSGP | FSCR_DSCR;
+	mtspr(SPR_HFSCR, fscr);
+
 	mtmsr(msr);
 
 	powernv_cpuref_init();