diff options
| author | Andrew Turner <andrew@FreeBSD.org> | 2024-04-23 11:28:23 +0000 |
|---|---|---|
| committer | Andrew Turner <andrew@FreeBSD.org> | 2024-05-10 09:29:24 +0000 |
| commit | 4ab0f5ab3fd6dcd7f76c1ed1c9dc0dcd152fb64f (patch) | |
| tree | ee66e3a931e4580a8e98034466f6985b33fca5c5 | |
| parent | f91e9401c2098ba56f43093ef9747d0b1f60f8eb (diff) | |
| download | src-4ab0f5ab3fd6dcd7f76c1ed1c9dc0dcd152fb64f.tar.gz src-4ab0f5ab3fd6dcd7f76c1ed1c9dc0dcd152fb64f.zip | |
arm64/gicv3: Check if the hardware supports LPIs
Some simulators have the ITS in the DTB passed to the kernel, however
it is a runtime configuration option to enable it.
Check the GICD_TYPER register to see if LPIs are enabled before
attaching the ITS driver.
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D44914
| -rw-r--r-- | sys/arm64/arm64/gic_v3.c | 4 | ||||
| -rw-r--r-- | sys/arm64/arm64/gic_v3_var.h | 2 | ||||
| -rw-r--r-- | sys/arm64/arm64/gicv3_its.c | 6 |
3 files changed, 12 insertions, 0 deletions
diff --git a/sys/arm64/arm64/gic_v3.c b/sys/arm64/arm64/gic_v3.c index b57dd9be48aa..0b25650b3fbf 100644 --- a/sys/arm64/arm64/gic_v3.c +++ b/sys/arm64/arm64/gic_v3.c @@ -494,6 +494,10 @@ gic_v3_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) case GICV3_IVAR_REDIST: *result = (uintptr_t)&sc->gic_redists.pcpu[PCPU_GET(cpuid)]; return (0); + case GICV3_IVAR_SUPPORT_LPIS: + *result = + (gic_d_read(sc, 4, GICD_TYPER) & GICD_TYPER_LPIS) != 0; + return (0); case GIC_IVAR_HW_REV: KASSERT( GICR_PIDR2_ARCH(sc->gic_pidr2) == GICR_PIDR2_ARCH_GICv3 || diff --git a/sys/arm64/arm64/gic_v3_var.h b/sys/arm64/arm64/gic_v3_var.h index 81526e7cc15e..1c5d354ee217 100644 --- a/sys/arm64/arm64/gic_v3_var.h +++ b/sys/arm64/arm64/gic_v3_var.h @@ -102,9 +102,11 @@ MALLOC_DECLARE(M_GIC_V3); #define GICV3_IVAR_NIRQS 1000 /* 1001 was GICV3_IVAR_REDIST_VADDR */ #define GICV3_IVAR_REDIST 1002 +#define GICV3_IVAR_SUPPORT_LPIS 1003 __BUS_ACCESSOR(gicv3, nirqs, GICV3, NIRQS, u_int); __BUS_ACCESSOR(gicv3, redist, GICV3, REDIST, void *); +__BUS_ACCESSOR(gicv3, support_lpis, GICV3, SUPPORT_LPIS, bool); /* Device methods */ int gic_v3_attach(device_t dev); diff --git a/sys/arm64/arm64/gicv3_its.c b/sys/arm64/arm64/gicv3_its.c index 31a0ded6c95d..46695a415e86 100644 --- a/sys/arm64/arm64/gicv3_its.c +++ b/sys/arm64/arm64/gicv3_its.c @@ -2208,6 +2208,9 @@ gicv3_its_fdt_probe(device_t dev) if (!ofw_bus_is_compatible(dev, "arm,gic-v3-its")) return (ENXIO); + if (!gicv3_get_support_lpis(dev)) + return (ENXIO); + device_set_desc(dev, "ARM GIC Interrupt Translation Service"); return (BUS_PROBE_DEFAULT); } @@ -2277,6 +2280,9 @@ gicv3_its_acpi_probe(device_t dev) if (gic_get_hw_rev(dev) < 3) return (EINVAL); + if (!gicv3_get_support_lpis(dev)) + return (ENXIO); + device_set_desc(dev, "ARM GIC Interrupt Translation Service"); return (BUS_PROBE_DEFAULT); } |