x86/PCI: MMCONFIG: add PCI_MMCFG_BUS_OFFSET() to factor common expression

This factors out the common "bus << 20" expression used when computing the
MMCONFIG address.

Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

3 files changed, 16 insertions, 17 deletions

diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index 067a2cfed15..4820f0e8c59 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -355,8 +355,9 @@ static void __init pci_mmcfg_insert_resources(void)
                 snprintf(names, PCI_MMCFG_RESOURCE_NAME_LEN,
                          "PCI MMCONFIG %u [%02x-%02x]", cfg->pci_segment,
                          cfg->start_bus_number, cfg->end_bus_number);
-                res->start = cfg->address + (cfg->start_bus_number << 20);
-                res->end = res->start + (num_buses << 20) - 1;
+                res->start = cfg->address +
+                        PCI_MMCFG_BUS_OFFSET(cfg->start_bus_number);
+                res->end = res->start + PCI_MMCFG_BUS_OFFSET(num_buses) - 1;
                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
                 insert_resource(&iomem_resource, res);
                 names += PCI_MMCFG_RESOURCE_NAME_LEN;
@@ -478,15 +479,14 @@ static void __init pci_mmcfg_reject_broken(int early)
                 return;
 
         for (i = 0; i < pci_mmcfg_config_num; i++) {
-                int valid = 0;
+                int num_buses, valid = 0;
                 u64 addr, size;
 
                 cfg = &pci_mmcfg_config[i];
-                addr = cfg->start_bus_number;
-                addr <<= 20;
-                addr += cfg->address;
-                size = cfg->end_bus_number + 1 - cfg->start_bus_number;
-                size <<= 20;
+                addr = cfg->address +
+                        PCI_MMCFG_BUS_OFFSET(cfg->start_bus_number);
+                num_buses = cfg->end_bus_number - cfg->start_bus_number + 1;
+                size = PCI_MMCFG_BUS_OFFSET(num_buses);
                 printk(KERN_NOTICE "PCI: MCFG configuration %d: base %lx "
                        "segment %hu buses %u - %u\n",
                        i, (unsigned long)cfg->address, cfg->pci_segment,
diff --git a/arch/x86/pci/mmconfig_32.c b/arch/x86/pci/mmconfig_32.c
index f10a7e94a84..8c19df89ad7 100644
--- a/arch/x86/pci/mmconfig_32.c
+++ b/arch/x86/pci/mmconfig_32.c
@@ -47,7 +47,7 @@ static u32 get_base_addr(unsigned int seg, int bus, unsigned devfn)
  */
 static void pci_exp_set_dev_base(unsigned int base, int bus, int devfn)
 {
-        u32 dev_base = base | (bus << 20) | (devfn << 12);
+        u32 dev_base = base | PCI_MMCFG_BUS_OFFSET(bus) | (devfn << 12);
         int cpu = smp_processor_id();
         if (dev_base != mmcfg_last_accessed_device ||
             cpu != mmcfg_last_accessed_cpu) {
diff --git a/arch/x86/pci/mmconfig_64.c b/arch/x86/pci/mmconfig_64.c
index 94349f8b2f9..8588711924c 100644
--- a/arch/x86/pci/mmconfig_64.c
+++ b/arch/x86/pci/mmconfig_64.c
@@ -43,7 +43,7 @@ static char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned i
         addr = get_virt(seg, bus);
         if (!addr)
                 return NULL;
-        return addr + ((bus << 20) | (devfn << 12));
+        return addr + (PCI_MMCFG_BUS_OFFSET(bus) | (devfn << 12));
 }
 
 static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
@@ -113,17 +113,16 @@ static void __iomem * __init mcfg_ioremap(struct acpi_mcfg_allocation *cfg)
 {
         void __iomem *addr;
         u64 start, size;
+        int num_buses;
 
-        start = cfg->start_bus_number;
-        start <<= 20;
-        start += cfg->address;
-        size = cfg->end_bus_number + 1 - cfg->start_bus_number;
-        size <<= 20;
+        start = cfg->address + PCI_MMCFG_BUS_OFFSET(cfg->start_bus_number);
+        num_buses = cfg->end_bus_number - cfg->start_bus_number + 1;
+        size = PCI_MMCFG_BUS_OFFSET(num_buses);
         addr = ioremap_nocache(start, size);
         if (addr) {
                 printk(KERN_INFO "PCI: Using MMCONFIG at %Lx - %Lx\n",
                        start, start + size - 1);
-                addr -= cfg->start_bus_number << 20;
+                addr -= PCI_MMCFG_BUS_OFFSET(cfg->start_bus_number);
         }
         return addr;
 }
@@ -162,7 +161,7 @@ void __init pci_mmcfg_arch_free(void)
 
         for (i = 0; i < pci_mmcfg_config_num; ++i) {
                 if (pci_mmcfg_virt[i].virt) {
-                        iounmap(pci_mmcfg_virt[i].virt + (pci_mmcfg_virt[i].cfg->start_bus_number << 20));
+                        iounmap(pci_mmcfg_virt[i].virt + PCI_MMCFG_BUS_OFFSET(pci_mmcfg_virt[i].cfg->start_bus_number));
                         pci_mmcfg_virt[i].virt = NULL;
                         pci_mmcfg_virt[i].cfg = NULL;
                 }