[IA64] SN specific version of dma_get_required_mask()
Create a platform specific version of dma_get_required_mask()
for ia64 SN Altix. All SN Altix platforms support 64 bit DMA
addressing regardless of the size of system memory.
Create an ia64 machvec for dma_get_required_mask, with the
SN version unconditionally returning DMA_64BIT_MASK.
Signed-off-by: John Keller <jpk@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 211fcfd..61f1af5 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -19,6 +19,7 @@
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
+#include <linux/bootmem.h>
#include <asm/machvec.h>
#include <asm/page.h>
@@ -748,6 +749,32 @@
pci_cache_line_size = (1 << cci.pcci_line_size) / 4;
}
+u64 ia64_dma_get_required_mask(struct device *dev)
+{
+ u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
+ u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
+ u64 mask;
+
+ if (!high_totalram) {
+ /* convert to mask just covering totalram */
+ low_totalram = (1 << (fls(low_totalram) - 1));
+ low_totalram += low_totalram - 1;
+ mask = low_totalram;
+ } else {
+ high_totalram = (1 << (fls(high_totalram) - 1));
+ high_totalram += high_totalram - 1;
+ mask = (((u64)high_totalram) << 32) + 0xffffffff;
+ }
+ return mask;
+}
+EXPORT_SYMBOL_GPL(ia64_dma_get_required_mask);
+
+u64 dma_get_required_mask(struct device *dev)
+{
+ return platform_dma_get_required_mask(dev);
+}
+EXPORT_SYMBOL_GPL(dma_get_required_mask);
+
static int __init pcibios_init(void)
{
set_pci_cacheline_size();