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powerpc: export the CPU node count

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At boot time, the FDT is parsed to compute the number of CPUs.
In addition count the number of CPU nodes and export it.

This is useful when building the FDT for a kexeced kernel since we need to
take in account the CPU node added since the boot time during CPU hotplug
operations.

Signed-off-by: Laurent Dufour <ldufour@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221110180619.15796-2-ldufour@linux.ibm.com
This commit is contained in:
Laurent Dufour 2022-11-10 19:06:18 +01:00 committed by Michael Ellerman
parent 5ddcc03a07
commit e13d23a404
2 changed files with 4 additions and 0 deletions
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1
arch/powerpc/include/asm/prom.h
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@ -85,6 +85,7 @@ struct of_drc_info {
extern int of_read_drc_info_cell(struct property **prop,
const __be32 **curval, struct of_drc_info *data);
extern unsigned int boot_cpu_node_count;
/*
* There are two methods for telling firmware what our capabilities are.

3
arch/powerpc/kernel/prom.c
View file

@ -72,6 +72,7 @@ int __initdata iommu_is_off;
int __initdata iommu_force_on;
unsigned long tce_alloc_start, tce_alloc_end;
u64 ppc64_rma_size;
unsigned int boot_cpu_node_count __ro_after_init;
#endif
static phys_addr_t first_memblock_size;
static int __initdata boot_cpu_count;
@ -335,6 +336,8 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
if (type == NULL || strcmp(type, "cpu") != 0)
return 0;
boot_cpu_node_count++;
/* Get physical cpuid */
intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
if (!intserv)