This is for QS21. The following patch allocates pages only from
the specified node, moves the ptcal area into the middle of the
allocated page to avoid potential prefetch problems and prints
the address of the ptcal area to facilitate diagnostics.
Signed-off-by: Gerhard Stenzel <gerhard.sten...@de.ibm.com>
Index: linux-2.6/arch/powerpc/platforms/cell/ras.c
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/ras.c
+++ linux-2.6/arch/powerpc/platforms/cell/ras.c
@@ -122,12 +122,22 @@ static int __init cbe_ptcal_enable_on_no
area->nid = nid;
area->order = order;
- area->pages = alloc_pages_node(area->nid, GFP_KERNEL, area->order);
+ area->pages = alloc_pages_node(area->nid, GFP_KERNEL | GFP_THISNODE,
area->order);
- if (!area->pages)
+ if (!area->pages) {
+ printk(KERN_INFO "%s: no page on node %d\n",
+ __FUNCTION__, area->nid);
goto out_free_area;
+ }
- addr = __pa(page_address(area->pages));
+ /*
+ * We move the ptcal area to the middle of the allocated
+ * page, in order to avoid prefetches in memcpy and similar
+ * functions stepping on it.
+ */
+ addr = __pa(page_address(area->pages)) + (PAGE_SIZE >> 1);
+ printk(KERN_INFO "%s: enabling PTCAL on node %d address=0x%016lx
PAGE_SIZE>>1=0x%016lx \n",
+ __FUNCTION__, area->nid, addr, PAGE_SIZE>>1);
ret = -EIO;
if (rtas_call(ptcal_start_tok, 3, 1, NULL, area->nid,
===================================================================
Best regards,
Gerhard Stenzel, Linux on Cell Development, LTC
-------------------------------------------------------------------------------------
IBM Deutschland Entwicklung GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter | Geschaeftsfuehrung: Erich Baier
Sitz der Gesellschaft: Boeblingen | Registergericht: Amtsgericht Stuttgart, HRB
243294
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