diff options
Diffstat (limited to 'arch/mips/cavium-octeon/setup.c')
| -rw-r--r-- | arch/mips/cavium-octeon/setup.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/arch/mips/cavium-octeon/setup.c b/arch/mips/cavium-octeon/setup.c index 041326e34f4..69197cb6c7e 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; |