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Diffstat (limited to 'arch/mips/cavium-octeon/setup.c')
-rw-r--r--arch/mips/cavium-octeon/setup.c34
1 files changed, 33 insertions, 1 deletions
diff --git a/arch/mips/cavium-octeon/setup.c b/arch/mips/cavium-octeon/setup.c
index 041326e34f4d..69197cb6c7ea 100644
--- a/arch/mips/cavium-octeon/setup.c
+++ b/arch/mips/cavium-octeon/setup.c
@@ -32,6 +32,7 @@
#include <asm/time.h>
#include <asm/octeon/octeon.h>
+#include <asm/octeon/pci-octeon.h>
#ifdef CONFIG_CAVIUM_DECODE_RSL
extern void cvmx_interrupt_rsl_decode(void);
@@ -609,6 +610,22 @@ void __init prom_init(void)
register_smp_ops(&octeon_smp_ops);
}
+/* Exclude a single page from the regions obtained in plat_mem_setup. */
+static __init void memory_exclude_page(u64 addr, u64 *mem, u64 *size)
+{
+ if (addr > *mem && addr < *mem + *size) {
+ u64 inc = addr - *mem;
+ add_memory_region(*mem, inc, BOOT_MEM_RAM);
+ *mem += inc;
+ *size -= inc;
+ }
+
+ if (addr == *mem && *size > PAGE_SIZE) {
+ *mem += PAGE_SIZE;
+ *size -= PAGE_SIZE;
+ }
+}
+
void __init plat_mem_setup(void)
{
uint64_t mem_alloc_size;
@@ -659,12 +676,27 @@ void __init plat_mem_setup(void)
CVMX_BOOTMEM_FLAG_NO_LOCKING);
#endif
if (memory >= 0) {
+ u64 size = mem_alloc_size;
+
+ /*
+ * exclude a page at the beginning and end of
+ * the 256MB PCIe 'hole' so the kernel will not
+ * try to allocate multi-page buffers that
+ * span the discontinuity.
+ */
+ memory_exclude_page(CVMX_PCIE_BAR1_PHYS_BASE,
+ &memory, &size);
+ memory_exclude_page(CVMX_PCIE_BAR1_PHYS_BASE +
+ CVMX_PCIE_BAR1_PHYS_SIZE,
+ &memory, &size);
+
/*
* This function automatically merges address
* regions next to each other if they are
* received in incrementing order.
*/
- add_memory_region(memory, mem_alloc_size, BOOT_MEM_RAM);
+ if (size)
+ add_memory_region(memory, size, BOOT_MEM_RAM);
total += mem_alloc_size;
} else {
break;