static int pseries_remove_lmb(unsigned long base, unsigned int lmb_size)
{
unsigned long start, start_pfn;
struct zone *zone;
int ret;
start_pfn = base >> PAGE_SHIFT;
if (!pfn_valid(start_pfn)) {
lmb_remove(base, lmb_size);
return 0;
}
zone = page_zone(pfn_to_page(start_pfn));
/*
* Remove section mappings and sysfs entries for the
* section of the memory we are removing.
*
* NOTE: Ideally, this should be done in generic code like
* remove_memory(). But remove_memory() gets called by writing
* to sysfs "state" file and we can't remove sysfs entries
* while writing to it. So we have to defer it to here.
*/
ret = __remove_pages(zone, start_pfn, lmb_size >> PAGE_SHIFT);
if (ret)
return ret;
/*
* Update memory regions for memory remove
*/
lmb_remove(base, lmb_size);
/*
* Remove htab bolted mappings for this section of memory
*/
start = (unsigned long)__va(base);
ret = remove_section_mapping(start, start + lmb_size);
/* Ensure all vmalloc mappings are flushed in case they also
* hit that section of memory
*/
vm_unmap_aliases();
return ret;
}
static int pseries_remove_memory(struct device_node *np)
{
const char *type;
const unsigned int *my_index;
const unsigned int *regs;
u64 start_pfn, start;
struct zone *zone;
int ret = -EINVAL;
/*
* Check to see if we are actually removing memory
*/
type = of_get_property(np, "device_type", NULL);
if (type == NULL || strcmp(type, "memory") != 0)
return 0;
/*
* Find the memory index and size of the removing section
*/
my_index = of_get_property(np, "ibm,my-drc-index", NULL);
if (!my_index)
return ret;
regs = of_get_property(np, "reg", NULL);
if (!regs)
return ret;
start_pfn = section_nr_to_pfn(*my_index & 0xffff);
zone = page_zone(pfn_to_page(start_pfn));
/*
* Remove section mappings and sysfs entries for the
* section of the memory we are removing.
*
* NOTE: Ideally, this should be done in generic code like
* remove_memory(). But remove_memory() gets called by writing
* to sysfs "state" file and we can't remove sysfs entries
* while writing to it. So we have to defer it to here.
*/
ret = __remove_pages(zone, start_pfn, regs[3] >> PAGE_SHIFT);
if (ret)
return ret;
/*
* Update memory regions for memory remove
*/
lmb_remove(start_pfn << PAGE_SHIFT, regs[3]);
/*
* Remove htab bolted mappings for this section of memory
*/
start = (unsigned long)__va(start_pfn << PAGE_SHIFT);
ret = remove_section_mapping(start, start + regs[3]);
return ret;
}
