diff options
Diffstat (limited to 'arch/tile/kernel')
| -rw-r--r-- | arch/tile/kernel/pci_gx.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/tile/kernel/pci_gx.c b/arch/tile/kernel/pci_gx.c index f2bf200b641..48438818d69 100644 --- a/arch/tile/kernel/pci_gx.c +++ b/arch/tile/kernel/pci_gx.c @@ -860,9 +860,15 @@ int __init pcibios_init(void) #endif + /* + * To save VMALLOC space, we take advantage of the fact that + * bit 29 in the PIO CFG address format is reserved 0. With + * TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR__MAC_SHIFT being 30, + * this cuts VMALLOC space usage from 1GB to 512MB per mac. + */ trio_context->mmio_base_pio_cfg[mac] = - iorpc_ioremap(trio_context->fd, offset, - (1 << TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR__MAC_SHIFT)); + iorpc_ioremap(trio_context->fd, offset, (1UL << + (TRIO_TILE_PIO_REGION_SETUP_CFG_ADDR__MAC_SHIFT - 1))); if (trio_context->mmio_base_pio_cfg[mac] == NULL) { pr_err("PCI: PIO map failure for mac %d on TRIO %d\n", mac, trio_index); |