irqchip/gic-v3: Only provision redistributors that are enabled in ACPI

We currently allocate redistributor region structures for
individual redistributors when ACPI doesn't present us with
compact MMIO regions covering multiple redistributors.

It turns out that we allocate these structures even when
the redistributor is flagged as disabled by ACPI. It works
fine until someone actually tries to tarse one of these
structures, and access the corresponding MMIO region.

Instead, track the number of enabled redistributors, and
only allocate what is required. This makes sure that there
is no invalid data to misuse.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reported-by: Heyi Guo <guoheyi@huawei.com>
Tested-by: Heyi Guo <guoheyi@huawei.com>
Link: https://lore.kernel.org/r/20191216062745.63397-1-guoheyi@huawei.com

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 286f98222878128758da9fc81ba18e5e2fe3e01c..c1f7af9d9ae719a8b01cf7c84760ce6cd9781070 100644 (file)
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1839,6 +1839,7 @@ static struct
        struct redist_region *redist_regs;
        u32 nr_redist_regions;
        bool single_redist;
+       int enabled_rdists;
        u32 maint_irq;
        int maint_irq_mode;
        phys_addr_t vcpu_base;
@@ -1933,8 +1934,10 @@ static int __init gic_acpi_match_gicc(union acpi_subtable_headers *header,
         * If GICC is enabled and has valid gicr base address, then it means
         * GICR base is presented via GICC
         */
-       if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address)
+       if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address) {
+               acpi_data.enabled_rdists++;
                return 0;
+       }
 
        /*
         * It's perfectly valid firmware can pass disabled GICC entry, driver
@@ -1964,8 +1967,10 @@ static int __init gic_acpi_count_gicr_regions(void)
 
        count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
                                      gic_acpi_match_gicc, 0);
-       if (count > 0)
+       if (count > 0) {
                acpi_data.single_redist = true;
+               count = acpi_data.enabled_rdists;
+       }
 
        return count;
 }