[Xen-devel] [PATCH v3 26/62] arm/gic-v2: Add ACPI boot support for GICv2
Stefano Stabellini
stefano.stabellini at eu.citrix.com
Tue Nov 24 03:54:42 PST 2015
On Tue, 17 Nov 2015, shannon.zhao at linaro.org wrote:
> From: Parth Dixit <parth.dixit at linaro.org>
>
> ACPI on Xen hypervisor uses MADT table for proper GIC initialization.
> First get the GIC version from GIC Distributor. Then parse GIC related
> subtables, collect CPU interface and distributor addresses and call
> driver initialization function (which is hardware abstraction agnostic).
> In a similar way, FDT initialize GICv2.
>
> Signed-off-by: Tomasz Nowicki <tomasz.nowicki at linaro.org>
> Signed-off-by: Hanjun Guo <hanjun.guo at linaro.org>
> Signed-off-by: Naresh Bhat <naresh.bhat at linaro.org>
> Signed-off-by: Parth Dixit <parth.dixit at linaro.org>
> Signed-off-by: Shannon Zhao <shannon.zhao at linaro.org>
> ---
> xen/arch/arm/gic-v2.c | 122 +++++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 121 insertions(+), 1 deletion(-)
>
> diff --git a/xen/arch/arm/gic-v2.c b/xen/arch/arm/gic-v2.c
> index e31d38e..9a9fcd5 100644
> --- a/xen/arch/arm/gic-v2.c
> +++ b/xen/arch/arm/gic-v2.c
> @@ -29,6 +29,8 @@
> #include <xen/device_tree.h>
> #include <xen/libfdt/libfdt.h>
> #include <xen/sizes.h>
> +#include <xen/acpi.h>
> +#include <acpi/actables.h>
> #include <asm/p2m.h>
> #include <asm/domain.h>
> #include <asm/platform.h>
> @@ -36,6 +38,7 @@
>
> #include <asm/io.h>
> #include <asm/gic.h>
> +#include <asm/acpi.h>
>
> /*
> * LR register definitions are GIC v2 specific.
> @@ -681,11 +684,113 @@ static void __init dt_gicv2_init(void)
> csize, vsize);
> }
>
> +#ifdef CONFIG_ACPI
> +static int __init
> +gic_acpi_parse_madt_cpu(struct acpi_subtable_header *header,
> + const unsigned long end)
> +{
> + static int cpu_base_assigned = 0;
> + struct acpi_madt_generic_interrupt *processor;
> +
> + processor = (struct acpi_madt_generic_interrupt *)header;
Use container_of to cast
> + if ( BAD_MADT_ENTRY(processor, end) )
> + return -EINVAL;
> +
> + /* Read from APIC table and fill up the GIC variables */
> + if ( cpu_base_assigned == 0 )
> + {
> + cbase = processor->base_address;
> + csize = SZ_8K;
> + hbase = processor->gich_base_address;
> + vbase = processor->gicv_base_address;
> + gicv2_info.maintenance_irq = processor->vgic_interrupt;
> +
> + if( processor->flags & ACPI_MADT_VGIC_IRQ_MODE )
> + irq_set_type(gicv2_info.maintenance_irq, ACPI_IRQ_TYPE_EDGE_BOTH);
> + else
> + irq_set_type(gicv2_info.maintenance_irq, ACPI_IRQ_TYPE_LEVEL_MASK);
> +
> + cpu_base_assigned = 1;
coding style
> + }
> + else
> + {
> + if ( cbase != processor->base_address
> + || hbase != processor->gich_base_address
> + || vbase != processor->gicv_base_address
> + || gicv2_info.maintenance_irq != processor->vgic_interrupt )
> + {
> + printk("GICv2: GICC entries are not same in MADT table\n");
> + return -EINVAL;
coding style
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int __init
> +gic_acpi_parse_madt_distributor(struct acpi_subtable_header *header,
> + const unsigned long end)
> +{
> + struct acpi_madt_generic_distributor *dist;
> +
> + dist = (struct acpi_madt_generic_distributor *)header;
Same here.
It looks OK aside from these few things.
> + if ( BAD_MADT_ENTRY(dist, end) )
> + return -EINVAL;
> +
> + dbase = dist->base_address;
> +
> + return 0;
> +}
> +
> +static void __init acpi_gicv2_init(void)
> +{
> + acpi_status status;
> + struct acpi_table_header *table;
> + int count;
> +
> + status = acpi_get_table(ACPI_SIG_MADT, 0, &table);
> +
> + if ( ACPI_FAILURE(status) )
> + {
> + const char *msg = acpi_format_exception(status);
> +
> + panic("GICv2: Failed to get MADT table, %s", msg);
> + }
> +
> + /* Collect CPU base addresses */
> + count = acpi_parse_entries(ACPI_SIG_MADT, sizeof(struct acpi_table_madt),
> + gic_acpi_parse_madt_cpu, table,
> + ACPI_MADT_TYPE_GENERIC_INTERRUPT, 0);
> + if ( count <= 0 )
> + panic("GICv2: No valid GICC entries exists");
> +
> + /*
> + * Find distributor base address. We expect one distributor entry since
> + * ACPI 5.0 spec neither support multi-GIC instances nor GIC cascade.
> + */
> + count = acpi_parse_entries(ACPI_SIG_MADT, sizeof(struct acpi_table_madt),
> + gic_acpi_parse_madt_distributor, table,
> + ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, 0);
> + if ( count <= 0 )
> + panic("GICv2: No valid GICD entries exists");
> +}
> +#else
> +static void __init acpi_gicv2_init(void)
> +{
> +/* Should never reach here */
> +}
> +#endif
> +
> static int __init gicv2_init(void)
> {
> uint32_t aliased_offset = 0;
>
> - dt_gicv2_init();
> + if( acpi_disabled )
> + dt_gicv2_init();
> + else
> + acpi_gicv2_init();
>
> printk("GICv2 initialization:\n"
> " gic_dist_addr=%"PRIpaddr"\n"
> @@ -793,6 +898,21 @@ DT_DEVICE_START(gicv2, "GICv2", DEVICE_GIC)
> .init = dt_gicv2_preinit,
> DT_DEVICE_END
>
> +#ifdef CONFIG_ACPI
> +/* Set up the GIC */
> +static int __init acpi_gicv2_preinit(const void *data)
> +{
> + gicv2_info.hw_version = GIC_V2;
> + register_gic_ops(&gicv2_ops);
> +
> + return 0;
> +}
> +
> +ACPI_DEVICE_START(agicv2, "GICv2", DEVICE_GIC)
> + .class_type = GIC_V2,
> + .init = acpi_gicv2_preinit,
> +ACPI_DEVICE_END
> +#endif
> /*
> * Local variables:
> * mode: C
More information about the linux-arm-kernel
mailing list