Merge tag 'powerpc-6.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:

 - Add powerpc qspinlock implementation optimised for large system
   scalability and paravirt. See the merge message for more details

 - Enable objtool to be built on powerpc to generate mcount locations

 - Use a temporary mm for code patching with the Radix MMU, so the
   writable mapping is restricted to the patching CPU

 - Add an option to build the 64-bit big-endian kernel with the ELFv2
   ABI

 - Sanitise user registers on interrupt entry on 64-bit Book3S

 - Many other small features and fixes

Thanks to Aboorva Devarajan, Angel Iglesias, Benjamin Gray, Bjorn
Helgaas, Bo Liu, Chen Lifu, Christoph Hellwig, Christophe JAILLET,
Christophe Leroy, Christopher M. Riedl, Colin Ian King, Deming Wang,
Disha Goel, Dmitry Torokhov, Finn Thain, Geert Uytterhoeven, Gustavo A.
R. Silva, Haowen Bai, Joel Stanley, Jordan Niethe, Julia Lawall, Kajol
Jain, Laurent Dufour, Li zeming, Miaoqian Lin, Michael Jeanson, Nathan
Lynch, Naveen N. Rao, Nayna Jain, Nicholas Miehlbradt, Nicholas Piggin,
Pali Rohár, Randy Dunlap, Rohan McLure, Russell Currey, Sathvika
Vasireddy, Shaomin Deng, Stephen Kitt, Stephen Rothwell, Thomas
Weißschuh, Tiezhu Yang, Uwe Kleine-König, Xie Shaowen, Xiu Jianfeng,
XueBing Chen, Yang Yingliang, Zhang Jiaming, ruanjinjie, Jessica Yu,
and Wolfram Sang.

* tag 'powerpc-6.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (181 commits)
  powerpc/code-patching: Fix oops with DEBUG_VM enabled
  powerpc/qspinlock: Fix 32-bit build
  powerpc/prom: Fix 32-bit build
  powerpc/rtas: mandate RTAS syscall filtering
  powerpc/rtas: define pr_fmt and convert printk call sites
  powerpc/rtas: clean up includes
  powerpc/rtas: clean up rtas_error_log_max initialization
  powerpc/pseries/eeh: use correct API for error log size
  powerpc/rtas: avoid scheduling in rtas_os_term()
  powerpc/rtas: avoid device tree lookups in rtas_os_term()
  powerpc/rtasd: use correct OF API for event scan rate
  powerpc/rtas: document rtas_call()
  powerpc/pseries: unregister VPA when hot unplugging a CPU
  powerpc/pseries: reset the RCU watchdogs after a LPM
  powerpc: Take in account addition CPU node when building kexec FDT
  powerpc: export the CPU node count
  powerpc/cpuidle: Set CPUIDLE_FLAG_POLLING for snooze state
  powerpc/dts/fsl: Fix pca954x i2c-mux node names
  cxl: Remove unnecessary cxl_pci_window_alignment()
  selftests/powerpc: Fix resource leaks
  ...

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 60e12b716d3c..af8854f9eae3 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;
 }
 
 /**