diff options
Diffstat (limited to 'drivers/irqchip/irq-gic-v3-its.c')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3-its.c | 43 |
1 files changed, 38 insertions, 5 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 4f567456296c..4251d2d8e6e7 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -28,6 +28,7 @@ #include <linux/list.h> #include <linux/list_sort.h> #include <linux/log2.h> +#include <linux/memblock.h> #include <linux/mm.h> #include <linux/msi.h> #include <linux/of.h> @@ -1629,6 +1630,33 @@ static void its_free_prop_table(struct page *prop_page) get_order(LPI_PROPBASE_SZ)); } +static bool gic_check_reserved_range(phys_addr_t addr, unsigned long size) +{ + phys_addr_t start, end, addr_end; + u64 i; + + /* + * We don't bother checking for a kdump kernel as by + * construction, the LPI tables are out of this kernel's + * memory map. + */ + if (is_kdump_kernel()) + return true; + + addr_end = addr + size - 1; + + for_each_reserved_mem_region(i, &start, &end) { + if (addr >= start && addr_end <= end) + return true; + } + + /* Not found, not a good sign... */ + pr_warn("GICv3: Expected reserved range [%pa:%pa], not found\n", + &addr, &addr_end); + add_taint(TAINT_CRAP, LOCKDEP_STILL_OK); + return false; +} + static int gic_reserve_range(phys_addr_t addr, unsigned long size) { if (efi_enabled(EFI_CONFIG_TABLES)) @@ -1976,15 +2004,19 @@ static void its_free_pending_table(struct page *pt) } /* - * Booting with kdump and LPIs enabled is generally fine. + * Booting with kdump and LPIs enabled is generally fine. Any other + * case is wrong in the absence of firmware/EFI support. */ static bool enabled_lpis_allowed(void) { - /* Allow a kdump kernel */ - if (is_kdump_kernel()) - return true; + phys_addr_t addr; + u64 val; - return false; + /* Check whether the property table is in a reserved region */ + val = gicr_read_propbaser(gic_data_rdist_rd_base() + GICR_PROPBASER); + addr = val & GENMASK_ULL(51, 12); + + return gic_check_reserved_range(addr, LPI_PROPBASE_SZ); } static int __init allocate_lpi_tables(void) @@ -2052,6 +2084,7 @@ static void its_cpu_init_lpis(void) paddr = gicr_read_pendbaser(rbase + GICR_PENDBASER); paddr &= GENMASK_ULL(51, 16); + WARN_ON(!gic_check_reserved_range(paddr, LPI_PENDBASE_SZ)); its_free_pending_table(gic_data_rdist()->pend_page); gic_data_rdist()->pend_page = NULL; |