Re: [PATCH] pseries: Fix 64 bit logical memory block panic

Anton Blanchard [off-list ref] writes:

quoted

Booting with a 4GB LMB size causes us to panic:

  qemu-system-ppc64: OS terminated: OS panic:
      Memory block size not suitable: 0x0

Fix pseries_memory_block_size() to handle 64 bit LMBs.

Cc: stable@vger.kernel.org
Signed-off-by: Anton Blanchard <redacted>
---
 arch/powerpc/platforms/pseries/hotplug-memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
index 5ace2f9a277e..6574ac33e887 100644
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c

@@ -27,7 +27,7 @@ static bool rtas_hp_event;
 unsigned long pseries_memory_block_size(void)
 {
 	struct device_node *np;
-	unsigned int memblock_size = MIN_MEMORY_BLOCK_SIZE;
+	uint64_t memblock_size = MIN_MEMORY_BLOCK_SIZE;
 	struct resource r;
 
 	np = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");

We need similar changes at more places?

modified   arch/powerpc/include/asm/book3s/64/mmu.h

@@ -85,7 +85,7 @@ extern unsigned int mmu_base_pid;
 /*
  * memory block size used with radix translation.
  */
-extern unsigned int __ro_after_init radix_mem_block_size;
+extern unsigned long __ro_after_init radix_mem_block_size;
 
 #define PRTB_SIZE_SHIFT	(mmu_pid_bits + 4)
 #define PRTB_ENTRIES	(1ul << mmu_pid_bits)

modified   arch/powerpc/include/asm/drmem.h

@@ -21,7 +21,7 @@ struct drmem_lmb {
 struct drmem_lmb_info {
 	struct drmem_lmb        *lmbs;
 	int                     n_lmbs;
-	u32                     lmb_size;
+	u64                     lmb_size;
 };
 
 extern struct drmem_lmb_info *drmem_info;

modified   arch/powerpc/mm/book3s64/radix_pgtable.c

@@ -34,7 +34,7 @@
 
 unsigned int mmu_pid_bits;
 unsigned int mmu_base_pid;
-unsigned int radix_mem_block_size __ro_after_init;
+unsigned long radix_mem_block_size __ro_after_init;

 static __ref void *early_alloc_pgtable(unsigned long size, int nid,
 			unsigned long region_start, unsigned long region_end)
modified   arch/powerpc/mm/drmem.c

@@ -268,14 +268,15 @@ static void __init __walk_drmem_v2_lmbs(const __be32 *prop, const __be32 *usm,
 void __init walk_drmem_lmbs_early(unsigned long node,
 			void (*func)(struct drmem_lmb *, const __be32 **))
 {
+	const __be64 *lmb_prop;
 	const __be32 *prop, *usm;
 	int len;
 
-	prop = of_get_flat_dt_prop(node, "ibm,lmb-size", &len);
-	if (!prop || len < dt_root_size_cells * sizeof(__be32))
+	lmb_prop = of_get_flat_dt_prop(node, "ibm,lmb-size", &len);
+	if (!lmb_prop || len < sizeof(__be64))
 		return;
 
-	drmem_info->lmb_size = dt_mem_next_cell(dt_root_size_cells, &prop);
+	drmem_info->lmb_size = be64_to_cpup(lmb_prop);

 	usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory", &len);
 

@@ -296,19 +297,19 @@ void __init walk_drmem_lmbs_early(unsigned long node,
 
 static int __init init_drmem_lmb_size(struct device_node *dn)
 {
-	const __be32 *prop;
+	const __be64 *prop;
 	int len;
 
 	if (drmem_info->lmb_size)
 		return 0;
 
 	prop = of_get_property(dn, "ibm,lmb-size", &len);
-	if (!prop || len < dt_root_size_cells * sizeof(__be32)) {
+	if (!prop || len < sizeof(__be64)) {
 		pr_info("Could not determine LMB size\n");
 		return -1;
 	}
 
-	drmem_info->lmb_size = dt_mem_next_cell(dt_root_size_cells, &prop);
+	drmem_info->lmb_size = be64_to_cpup(prop);