diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/kexec/file_load_64.c | 59 |
1 files changed, 58 insertions, 1 deletions
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c index 349a781cea0b..2500c37c628c 100644 --- a/arch/powerpc/kexec/file_load_64.c +++ b/arch/powerpc/kexec/file_load_64.c @@ -26,6 +26,7 @@ #include <asm/firmware.h> #include <asm/kexec_ranges.h> #include <asm/crashdump-ppc64.h> +#include <asm/prom.h> struct umem_info { u64 *buf; /* data buffer for usable-memory property */ @@ -929,6 +930,45 @@ out: } /** + * get_cpu_node_size - Compute the size of a CPU node in the FDT. + * This should be done only once and the value is stored in + * a static variable. + * Returns the max size of a CPU node in the FDT. + */ +static unsigned int cpu_node_size(void) +{ + static unsigned int size; + struct device_node *dn; + struct property *pp; + + /* + * Don't compute it twice, we are assuming that the per CPU node size + * doesn't change during the system's life. + */ + if (size) + return size; + + dn = of_find_node_by_type(NULL, "cpu"); + if (WARN_ON_ONCE(!dn)) { + // Unlikely to happen + return 0; + } + + /* + * We compute the sub node size for a CPU node, assuming it + * will be the same for all. + */ + size += strlen(dn->name) + 5; + for_each_property_of_node(dn, pp) { + size += strlen(pp->name); + size += pp->length; + } + + of_node_put(dn); + return size; +} + +/** * kexec_extra_fdt_size_ppc64 - Return the estimated additional size needed to * setup FDT for kexec/kdump kernel. * @image: kexec image being loaded. @@ -937,6 +977,8 @@ out: */ unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image) { + unsigned int cpu_nodes, extra_size; + struct device_node *dn; u64 usm_entries; if (image->type != KEXEC_TYPE_CRASH) @@ -949,7 +991,22 @@ unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image) */ usm_entries = ((memblock_end_of_DRAM() / drmem_lmb_size()) + (2 * (resource_size(&crashk_res) / drmem_lmb_size()))); - return (unsigned int)(usm_entries * sizeof(u64)); + + extra_size = (unsigned int)(usm_entries * sizeof(u64)); + + /* + * Get the number of CPU nodes in the current DT. This allows to + * reserve places for CPU nodes added since the boot time. + */ + cpu_nodes = 0; + for_each_node_by_type(dn, "cpu") { + cpu_nodes++; + } + + if (cpu_nodes > boot_cpu_node_count) + extra_size += (cpu_nodes - boot_cpu_node_count) * cpu_node_size(); + + return extra_size; } /** |