Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / drivers / acpi / pci_root.c
index d724736..5b0f075 100644 (file)
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/types.h>
-#include <linux/proc_fs.h>
 #include <linux/spinlock.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/pci.h>
 #include <linux/pci-acpi.h>
+#include <linux/pci-aspm.h>
 #include <linux/acpi.h>
+#include <linux/slab.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
+#include <acpi/apei.h>
 
 #define PREFIX "ACPI: "
 
@@ -47,6 +49,11 @@ static int acpi_pci_root_add(struct acpi_device *device);
 static int acpi_pci_root_remove(struct acpi_device *device, int type);
 static int acpi_pci_root_start(struct acpi_device *device);
 
+#define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \
+                               | OSC_ACTIVE_STATE_PWR_SUPPORT \
+                               | OSC_CLOCK_PWR_CAPABILITY_SUPPORT \
+                               | OSC_MSI_SUPPORT)
+
 static const struct acpi_device_id root_device_ids[] = {
        {"PNP0A03", 0},
        {"", 0},
@@ -119,7 +126,8 @@ acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
        struct acpi_pci_root *root;
        
        list_for_each_entry(root, &acpi_pci_roots, node)
-               if ((root->segment == (u16) seg) && (root->bus_nr == (u16) bus))
+               if ((root->segment == (u16) seg) &&
+                   (root->secondary.start == (u16) bus))
                        return root->device->handle;
        return NULL;            
 }
@@ -153,7 +161,7 @@ EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
 static acpi_status
 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
 {
-       int *busnr = data;
+       struct resource *res = data;
        struct acpi_resource_address64 address;
 
        if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
@@ -163,28 +171,27 @@ get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
 
        acpi_resource_to_address64(resource, &address);
        if ((address.address_length > 0) &&
-           (address.resource_type == ACPI_BUS_NUMBER_RANGE))
-               *busnr = address.minimum;
+           (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
+               res->start = address.minimum;
+               res->end = address.minimum + address.address_length - 1;
+       }
 
        return AE_OK;
 }
 
 static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
-                                            unsigned long long *bus)
+                                            struct resource *res)
 {
        acpi_status status;
-       int busnum;
 
-       busnum = -1;
+       res->start = -1;
        status =
            acpi_walk_resources(handle, METHOD_NAME__CRS,
-                               get_root_bridge_busnr_callback, &busnum);
+                               get_root_bridge_busnr_callback, res);
        if (ACPI_FAILURE(status))
                return status;
-       /* Check if we really get a bus number from _CRS */
-       if (busnum == -1)
+       if (res->start == -1)
                return AE_ERROR;
-       *bus = busnum;
        return AE_OK;
 }
 
@@ -224,22 +231,31 @@ static acpi_status acpi_pci_run_osc(acpi_handle handle,
        return status;
 }
 
-static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 flags)
+static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
+                                       u32 support,
+                                       u32 *control)
 {
        acpi_status status;
-       u32 support_set, result, capbuf[3];
+       u32 result, capbuf[3];
+
+       support &= OSC_PCI_SUPPORT_MASKS;
+       support |= root->osc_support_set;
 
-       /* do _OSC query for all possible controls */
-       support_set = root->osc_support_set | (flags & OSC_PCI_SUPPORT_MASKS);
        capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
-       capbuf[OSC_SUPPORT_TYPE] = support_set;
-       capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS;
+       capbuf[OSC_SUPPORT_TYPE] = support;
+       if (control) {
+               *control &= OSC_PCI_CONTROL_MASKS;
+               capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set;
+       } else {
+               /* Run _OSC query only with existing controls. */
+               capbuf[OSC_CONTROL_TYPE] = root->osc_control_set;
+       }
 
        status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
        if (ACPI_SUCCESS(status)) {
-               root->osc_support_set = support_set;
-               root->osc_control_qry = result;
-               root->osc_queried = 1;
+               root->osc_support_set = support;
+               if (control)
+                       *control = result;
        }
        return status;
 }
@@ -253,7 +269,7 @@ static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
        if (ACPI_FAILURE(status))
                return status;
        mutex_lock(&osc_lock);
-       status = acpi_pci_query_osc(root, flags);
+       status = acpi_pci_query_osc(root, flags, NULL);
        mutex_unlock(&osc_lock);
        return status;
 }
@@ -363,55 +379,70 @@ out:
 EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
 
 /**
- * acpi_pci_osc_control_set - commit requested control to Firmware
- * @handle: acpi_handle for the target ACPI object
- * @flags: driver's requested control bits
+ * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
+ * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
+ * @mask: Mask of _OSC bits to request control of, place to store control mask.
+ * @req: Mask of _OSC bits the control of is essential to the caller.
+ *
+ * Run _OSC query for @mask and if that is successful, compare the returned
+ * mask of control bits with @req.  If all of the @req bits are set in the
+ * returned mask, run _OSC request for it.
  *
- * Attempt to take control from Firmware on requested control bits.
+ * The variable at the @mask address may be modified regardless of whether or
+ * not the function returns success.  On success it will contain the mask of
+ * _OSC bits the BIOS has granted control of, but its contents are meaningless
+ * on failure.
  **/
-acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 flags)
+acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
 {
+       struct acpi_pci_root *root;
        acpi_status status;
-       u32 control_req, result, capbuf[3];
+       u32 ctrl, capbuf[3];
        acpi_handle tmp;
-       struct acpi_pci_root *root;
 
-       status = acpi_get_handle(handle, "_OSC", &tmp);
-       if (ACPI_FAILURE(status))
-               return status;
+       if (!mask)
+               return AE_BAD_PARAMETER;
 
-       control_req = (flags & OSC_PCI_CONTROL_MASKS);
-       if (!control_req)
+       ctrl = *mask & OSC_PCI_CONTROL_MASKS;
+       if ((ctrl & req) != req)
                return AE_TYPE;
 
        root = acpi_pci_find_root(handle);
        if (!root)
                return AE_NOT_EXIST;
 
+       status = acpi_get_handle(handle, "_OSC", &tmp);
+       if (ACPI_FAILURE(status))
+               return status;
+
        mutex_lock(&osc_lock);
+
+       *mask = ctrl | root->osc_control_set;
        /* No need to evaluate _OSC if the control was already granted. */
-       if ((root->osc_control_set & control_req) == control_req)
+       if ((root->osc_control_set & ctrl) == ctrl)
                goto out;
 
-       /* Need to query controls first before requesting them */
-       if (!root->osc_queried) {
-               status = acpi_pci_query_osc(root, root->osc_support_set);
+       /* Need to check the available controls bits before requesting them. */
+       while (*mask) {
+               status = acpi_pci_query_osc(root, root->osc_support_set, mask);
                if (ACPI_FAILURE(status))
                        goto out;
+               if (ctrl == *mask)
+                       break;
+               ctrl = *mask;
        }
-       if ((root->osc_control_qry & control_req) != control_req) {
-               printk(KERN_DEBUG
-                      "Firmware did not grant requested _OSC control\n");
+
+       if ((ctrl & req) != req) {
                status = AE_SUPPORT;
                goto out;
        }
 
        capbuf[OSC_QUERY_TYPE] = 0;
        capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
-       capbuf[OSC_CONTROL_TYPE] = root->osc_control_set | control_req;
-       status = acpi_pci_run_osc(handle, capbuf, &result);
+       capbuf[OSC_CONTROL_TYPE] = ctrl;
+       status = acpi_pci_run_osc(handle, capbuf, mask);
        if (ACPI_SUCCESS(status))
-               root->osc_control_set = result;
+               root->osc_control_set = *mask;
 out:
        mutex_unlock(&osc_lock);
        return status;
@@ -428,34 +459,48 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
        struct acpi_device *child;
        u32 flags, base_flags;
 
+       root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
+       if (!root)
+               return -ENOMEM;
+
        segment = 0;
        status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
                                       &segment);
        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
                printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
-               return -ENODEV;
+               result = -ENODEV;
+               goto end;
        }
 
        /* Check _CRS first, then _BBN.  If no _BBN, default to zero. */
-       bus = 0;
-       status = try_get_root_bridge_busnr(device->handle, &bus);
+       root->secondary.flags = IORESOURCE_BUS;
+       status = try_get_root_bridge_busnr(device->handle, &root->secondary);
        if (ACPI_FAILURE(status)) {
-               status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN,                                               NULL, &bus);
-               if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
-                       printk(KERN_ERR PREFIX
-                            "no bus number in _CRS and can't evaluate _BBN\n");
-                       return -ENODEV;
+               /*
+                * We need both the start and end of the downstream bus range
+                * to interpret _CBA (MMCONFIG base address), so it really is
+                * supposed to be in _CRS.  If we don't find it there, all we
+                * can do is assume [_BBN-0xFF] or [0-0xFF].
+                */
+               root->secondary.end = 0xFF;
+               printk(KERN_WARNING FW_BUG PREFIX
+                      "no secondary bus range in _CRS\n");
+               status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN,
+                                              NULL, &bus);
+               if (ACPI_SUCCESS(status))
+                       root->secondary.start = bus;
+               else if (status == AE_NOT_FOUND)
+                       root->secondary.start = 0;
+               else {
+                       printk(KERN_ERR PREFIX "can't evaluate _BBN\n");
+                       result = -ENODEV;
+                       goto end;
                }
        }
 
-       root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
-       if (!root)
-               return -ENOMEM;
-
        INIT_LIST_HEAD(&root->node);
        root->device = device;
        root->segment = segment & 0xFFFF;
-       root->bus_nr = bus & 0xFF;
        strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
        strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
        device->driver_data = root;
@@ -474,9 +519,9 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
        /* TBD: Locking */
        list_add_tail(&root->node, &acpi_pci_roots);
 
-       printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
+       printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n",
               acpi_device_name(device), acpi_device_bid(device),
-              root->segment, root->bus_nr);
+              root->segment, &root->secondary);
 
        /*
         * Scan the Root Bridge
@@ -485,11 +530,11 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
         * PCI namespace does not get created until this call is made (and 
         * thus the root bridge's pci_dev does not exist).
         */
-       root->bus = pci_acpi_scan_root(device, segment, bus);
+       root->bus = pci_acpi_scan_root(root);
        if (!root->bus) {
                printk(KERN_ERR PREFIX
                            "Bus %04x:%02x not present in PCI namespace\n",
-                           root->segment, root->bus_nr);
+                           root->segment, (unsigned int)root->secondary.start);
                result = -ENODEV;
                goto end;
        }
@@ -521,7 +566,7 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
        /* Indicate support for various _OSC capabilities. */
        if (pci_ext_cfg_avail(root->bus->self))
                flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
-       if (pcie_aspm_enabled())
+       if (pcie_aspm_support_enabled())
                flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
                        OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
        if (pci_msi_enabled())
@@ -529,6 +574,50 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
        if (flags != base_flags)
                acpi_pci_osc_support(root, flags);
 
+       if (!pcie_ports_disabled
+           && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) {
+               flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL
+                       | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
+                       | OSC_PCI_EXPRESS_PME_CONTROL;
+
+               if (pci_aer_available()) {
+                       if (aer_acpi_firmware_first())
+                               dev_dbg(root->bus->bridge,
+                                       "PCIe errors handled by BIOS.\n");
+                       else
+                               flags |= OSC_PCI_EXPRESS_AER_CONTROL;
+               }
+
+               dev_info(root->bus->bridge,
+                       "Requesting ACPI _OSC control (0x%02x)\n", flags);
+
+               status = acpi_pci_osc_control_set(device->handle, &flags,
+                                       OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
+               if (ACPI_SUCCESS(status)) {
+                       dev_info(root->bus->bridge,
+                               "ACPI _OSC control (0x%02x) granted\n", flags);
+                       if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
+                               /*
+                                * We have ASPM control, but the FADT indicates
+                                * that it's unsupported. Clear it.
+                                */
+                               pcie_clear_aspm(root->bus);
+                       }
+               } else {
+                       dev_info(root->bus->bridge,
+                               "ACPI _OSC request failed (%s), "
+                               "returned control mask: 0x%02x\n",
+                               acpi_format_exception(status), flags);
+                       pr_info("ACPI _OSC control for PCIe not granted, "
+                               "disabling ASPM\n");
+                       pcie_no_aspm();
+               }
+       } else {
+               dev_info(root->bus->bridge,
+                        "Unable to request _OSC control "
+                        "(_OSC support mask: 0x%02x)\n", flags);
+       }
+
        pci_acpi_add_bus_pm_notifier(device, root->bus);
        if (device->wakeup.flags.run_wake)
                device_set_run_wake(root->bus->bridge, true);
@@ -563,6 +652,8 @@ static int acpi_pci_root_remove(struct acpi_device *device, int type)
 
 static int __init acpi_pci_root_init(void)
 {
+       acpi_hest_init();
+
        if (acpi_pci_disabled)
                return 0;