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;