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ehea: Detect 16GB hugepages for firmware restriction

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All kernel memory which is used for kernel/hardware data transfer must
be registered with firmware using "memory regions". 16GB hugepages
may not be part of a memory region due to firmware restrictions.
This patch modifies the walk_memory_resource callback fn to filter
hugepages and add only standard memory to the busmap which is later
on used for MR registration.

Signed-off-by: Thomas Klein <tklein@de.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Thomas Klein
2008-10-27 10:38:46 +01:00
committed by Jeff Garzik
parent 74d5e8acd9
commit 3fd09c45bf
3 changed files with 56 additions and 6 deletions
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57
drivers/net/ehea/ehea_qmr.c
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@@ -632,10 +632,13 @@ static void ehea_rebuild_busmap(void)
}
}
static int ehea_update_busmap(unsigned long pfn, unsigned long pgnum, int add)
static int ehea_update_busmap(unsigned long pfn, unsigned long nr_pages, int add)
{
unsigned long i, start_section, end_section;
if (!nr_pages)
return 0;
if (!ehea_bmap) {
ehea_bmap = kzalloc(sizeof(struct ehea_bmap), GFP_KERNEL);
if (!ehea_bmap)
@@ -643,7 +646,7 @@ static int ehea_update_busmap(unsigned long pfn, unsigned long pgnum, int add)
}
start_section = (pfn * PAGE_SIZE) / EHEA_SECTSIZE;
end_section = start_section + ((pgnum * PAGE_SIZE) / EHEA_SECTSIZE);
end_section = start_section + ((nr_pages * PAGE_SIZE) / EHEA_SECTSIZE);
/* Mark entries as valid or invalid only; address is assigned later */
for (i = start_section; i < end_section; i++) {
u64 flag;
@@ -692,10 +695,54 @@ int ehea_rem_sect_bmap(unsigned long pfn, unsigned long nr_pages)
return ret;
}
static int ehea_create_busmap_callback(unsigned long pfn,
unsigned long nr_pages, void *arg)
static int ehea_is_hugepage(unsigned long pfn)
{
return ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
int page_order;
if (pfn & EHEA_HUGEPAGE_PFN_MASK)
return 0;
page_order = compound_order(pfn_to_page(pfn));
if (page_order + PAGE_SHIFT != EHEA_HUGEPAGESHIFT)
return 0;
return 1;
}
static int ehea_create_busmap_callback(unsigned long initial_pfn,
unsigned long total_nr_pages, void *arg)
{
int ret;
unsigned long pfn, start_pfn, end_pfn, nr_pages;
if ((total_nr_pages * PAGE_SIZE) < EHEA_HUGEPAGE_SIZE)
return ehea_update_busmap(initial_pfn, total_nr_pages,
EHEA_BUSMAP_ADD_SECT);
/* Given chunk is >= 16GB -> check for hugepages */
start_pfn = initial_pfn;
end_pfn = initial_pfn + total_nr_pages;
pfn = start_pfn;
while (pfn < end_pfn) {
if (ehea_is_hugepage(pfn)) {
/* Add mem found in front of the hugepage */
nr_pages = pfn - start_pfn;
ret = ehea_update_busmap(start_pfn, nr_pages,
EHEA_BUSMAP_ADD_SECT);
if (ret)
return ret;
/* Skip the hugepage */
pfn += (EHEA_HUGEPAGE_SIZE / PAGE_SIZE);
start_pfn = pfn;
} else
pfn += (EHEA_SECTSIZE / PAGE_SIZE);
}
/* Add mem found behind the hugepage(s) */
nr_pages = pfn - start_pfn;
return ehea_update_busmap(start_pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
}
int ehea_create_busmap(void)