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Commit 21823259 authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: Ensure active regions have a backing PMB entry. 



In the NUMA or memory hot-add case where system memory has been
partitioned up, we immediately run in to a situation where the existing
PMB entry doesn't cover the new range (primarily as a result of the entry
size being shrunk to match the node size early in the initialization). In
order to fix this up it's necessary to preload a PMB mapping for the new
range prior to activation in order to circumvent reset by MMU.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent dfbca899

arch/sh/kernel/setup.c

+15 −2
Original line number Diff line number Diff line
@@ -191,13 +191,18 @@ void __init __add_active_range(unsigned int nid, unsigned long start_pfn, 
						unsigned long end_pfn)

{

	struct resource *res = &mem_resources[nid];

	unsigned long start, end;



	WARN_ON(res->name); /* max one active range per node for now */



	start = start_pfn << PAGE_SHIFT;

	end = end_pfn << PAGE_SHIFT;



	res->name = "System RAM";

	res->start = start_pfn << PAGE_SHIFT;

	res->end = (end_pfn << PAGE_SHIFT) - 1;

	res->start = start;

	res->end = end - 1;

	res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;



	if (request_resource(&iomem_resource, res)) {

		pr_err("unable to request memory_resource 0x%lx 0x%lx\n",

		       start_pfn, end_pfn);
@@ -213,6 +218,14 @@ void __init __add_active_range(unsigned int nid, unsigned long start_pfn, 
	request_resource(res, &data_resource);

	request_resource(res, &bss_resource);



	/*

	 * Also make sure that there is a PMB mapping that covers this

	 * range before we attempt to activate it, to avoid reset by MMU.

	 * We can hit this path with NUMA or memory hot-add.

	 */

	pmb_bolt_mapping((unsigned long)__va(start), start, end - start,

			 PAGE_KERNEL);



	add_active_range(nid, start_pfn, end_pfn);

}