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arm64/gicv3: Check if the hardware supports LPIs

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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
This commit is contained in:
Andrew Turner 2024-04-23 12:28:23 +01:00
parent f91e9401c2
commit 4ab0f5ab3f
3 changed files with 12 additions and 0 deletions
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4
sys/arm64/arm64/gic_v3.c
View file

@ -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 ||

2
sys/arm64/arm64/gic_v3_var.h
View file

@ -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);

6
sys/arm64/arm64/gicv3_its.c
View file

@ -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);
}