0,0 → 1,420 |
/******************************************************************************* |
* |
* Module Name: hwpci - Obtain PCI bus, device, and function numbers |
* |
******************************************************************************/ |
|
/* |
* Copyright (C) 2000 - 2015, Intel Corp. |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* 1. Redistributions of source code must retain the above copyright |
* notice, this list of conditions, and the following disclaimer, |
* without modification. |
* 2. Redistributions in binary form must reproduce at minimum a disclaimer |
* substantially similar to the "NO WARRANTY" disclaimer below |
* ("Disclaimer") and any redistribution must be conditioned upon |
* including a substantially similar Disclaimer requirement for further |
* binary redistribution. |
* 3. Neither the names of the above-listed copyright holders nor the names |
* of any contributors may be used to endorse or promote products derived |
* from this software without specific prior written permission. |
* |
* Alternatively, this software may be distributed under the terms of the |
* GNU General Public License ("GPL") version 2 as published by the Free |
* Software Foundation. |
* |
* NO WARRANTY |
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
* POSSIBILITY OF SUCH DAMAGES. |
*/ |
|
#include <acpi/acpi.h> |
#include "accommon.h" |
|
#define _COMPONENT ACPI_NAMESPACE |
ACPI_MODULE_NAME("hwpci") |
|
/* PCI configuration space values */ |
#define PCI_CFG_HEADER_TYPE_REG 0x0E |
#define PCI_CFG_PRIMARY_BUS_NUMBER_REG 0x18 |
#define PCI_CFG_SECONDARY_BUS_NUMBER_REG 0x19 |
/* PCI header values */ |
#define PCI_HEADER_TYPE_MASK 0x7F |
#define PCI_TYPE_BRIDGE 0x01 |
#define PCI_TYPE_CARDBUS_BRIDGE 0x02 |
typedef struct acpi_pci_device { |
acpi_handle device; |
struct acpi_pci_device *next; |
|
} acpi_pci_device; |
|
/* Local prototypes */ |
|
static acpi_status |
acpi_hw_build_pci_list(acpi_handle root_pci_device, |
acpi_handle pci_region, |
struct acpi_pci_device **return_list_head); |
|
static acpi_status |
acpi_hw_process_pci_list(struct acpi_pci_id *pci_id, |
struct acpi_pci_device *list_head); |
|
static void acpi_hw_delete_pci_list(struct acpi_pci_device *list_head); |
|
static acpi_status |
acpi_hw_get_pci_device_info(struct acpi_pci_id *pci_id, |
acpi_handle pci_device, |
u16 *bus_number, u8 *is_bridge); |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_hw_derive_pci_id |
* |
* PARAMETERS: pci_id - Initial values for the PCI ID. May be |
* modified by this function. |
* root_pci_device - A handle to a PCI device object. This |
* object must be a PCI Root Bridge having a |
* _HID value of either PNP0A03 or PNP0A08 |
* pci_region - A handle to a PCI configuration space |
* Operation Region being initialized |
* |
* RETURN: Status |
* |
* DESCRIPTION: This function derives a full PCI ID for a PCI device, |
* consisting of a Segment number, Bus number, Device number, |
* and function code. |
* |
* The PCI hardware dynamically configures PCI bus numbers |
* depending on the bus topology discovered during system |
* initialization. This function is invoked during configuration |
* of a PCI_Config Operation Region in order to (possibly) update |
* the Bus/Device/Function numbers in the pci_id with the actual |
* values as determined by the hardware and operating system |
* configuration. |
* |
* The pci_id parameter is initially populated during the Operation |
* Region initialization. This function is then called, and is |
* will make any necessary modifications to the Bus, Device, or |
* Function number PCI ID subfields as appropriate for the |
* current hardware and OS configuration. |
* |
* NOTE: Created 08/2010. Replaces the previous OSL acpi_os_derive_pci_id |
* interface since this feature is OS-independent. This module |
* specifically avoids any use of recursion by building a local |
* temporary device list. |
* |
******************************************************************************/ |
|
acpi_status |
acpi_hw_derive_pci_id(struct acpi_pci_id *pci_id, |
acpi_handle root_pci_device, acpi_handle pci_region) |
{ |
acpi_status status; |
struct acpi_pci_device *list_head; |
|
ACPI_FUNCTION_TRACE(hw_derive_pci_id); |
|
if (!pci_id) { |
return_ACPI_STATUS(AE_BAD_PARAMETER); |
} |
|
/* Build a list of PCI devices, from pci_region up to root_pci_device */ |
|
status = |
acpi_hw_build_pci_list(root_pci_device, pci_region, &list_head); |
if (ACPI_SUCCESS(status)) { |
|
/* Walk the list, updating the PCI device/function/bus numbers */ |
|
status = acpi_hw_process_pci_list(pci_id, list_head); |
|
/* Delete the list */ |
|
acpi_hw_delete_pci_list(list_head); |
} |
|
return_ACPI_STATUS(status); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_hw_build_pci_list |
* |
* PARAMETERS: root_pci_device - A handle to a PCI device object. This |
* object is guaranteed to be a PCI Root |
* Bridge having a _HID value of either |
* PNP0A03 or PNP0A08 |
* pci_region - A handle to the PCI configuration space |
* Operation Region |
* return_list_head - Where the PCI device list is returned |
* |
* RETURN: Status |
* |
* DESCRIPTION: Builds a list of devices from the input PCI region up to the |
* Root PCI device for this namespace subtree. |
* |
******************************************************************************/ |
|
static acpi_status |
acpi_hw_build_pci_list(acpi_handle root_pci_device, |
acpi_handle pci_region, |
struct acpi_pci_device **return_list_head) |
{ |
acpi_handle current_device; |
acpi_handle parent_device; |
acpi_status status; |
struct acpi_pci_device *list_element; |
|
/* |
* Ascend namespace branch until the root_pci_device is reached, building |
* a list of device nodes. Loop will exit when either the PCI device is |
* found, or the root of the namespace is reached. |
*/ |
*return_list_head = NULL; |
current_device = pci_region; |
while (1) { |
status = acpi_get_parent(current_device, &parent_device); |
if (ACPI_FAILURE(status)) { |
|
/* Must delete the list before exit */ |
|
acpi_hw_delete_pci_list(*return_list_head); |
return (status); |
} |
|
/* Finished when we reach the PCI root device (PNP0A03 or PNP0A08) */ |
|
if (parent_device == root_pci_device) { |
return (AE_OK); |
} |
|
list_element = ACPI_ALLOCATE(sizeof(struct acpi_pci_device)); |
if (!list_element) { |
|
/* Must delete the list before exit */ |
|
acpi_hw_delete_pci_list(*return_list_head); |
return (AE_NO_MEMORY); |
} |
|
/* Put new element at the head of the list */ |
|
list_element->next = *return_list_head; |
list_element->device = parent_device; |
*return_list_head = list_element; |
|
current_device = parent_device; |
} |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_hw_process_pci_list |
* |
* PARAMETERS: pci_id - Initial values for the PCI ID. May be |
* modified by this function. |
* list_head - Device list created by |
* acpi_hw_build_pci_list |
* |
* RETURN: Status |
* |
* DESCRIPTION: Walk downward through the PCI device list, getting the device |
* info for each, via the PCI configuration space and updating |
* the PCI ID as necessary. Deletes the list during traversal. |
* |
******************************************************************************/ |
|
static acpi_status |
acpi_hw_process_pci_list(struct acpi_pci_id *pci_id, |
struct acpi_pci_device *list_head) |
{ |
acpi_status status = AE_OK; |
struct acpi_pci_device *info; |
u16 bus_number; |
u8 is_bridge = TRUE; |
|
ACPI_FUNCTION_NAME(hw_process_pci_list); |
|
ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, |
"Input PciId: Seg %4.4X Bus %4.4X Dev %4.4X Func %4.4X\n", |
pci_id->segment, pci_id->bus, pci_id->device, |
pci_id->function)); |
|
bus_number = pci_id->bus; |
|
/* |
* Descend down the namespace tree, collecting PCI device, function, |
* and bus numbers. bus_number is only important for PCI bridges. |
* Algorithm: As we descend the tree, use the last valid PCI device, |
* function, and bus numbers that are discovered, and assign them |
* to the PCI ID for the target device. |
*/ |
info = list_head; |
while (info) { |
status = acpi_hw_get_pci_device_info(pci_id, info->device, |
&bus_number, &is_bridge); |
if (ACPI_FAILURE(status)) { |
return (status); |
} |
|
info = info->next; |
} |
|
ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, |
"Output PciId: Seg %4.4X Bus %4.4X Dev %4.4X Func %4.4X " |
"Status %X BusNumber %X IsBridge %X\n", |
pci_id->segment, pci_id->bus, pci_id->device, |
pci_id->function, status, bus_number, is_bridge)); |
|
return (AE_OK); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_hw_delete_pci_list |
* |
* PARAMETERS: list_head - Device list created by |
* acpi_hw_build_pci_list |
* |
* RETURN: None |
* |
* DESCRIPTION: Free the entire PCI list. |
* |
******************************************************************************/ |
|
static void acpi_hw_delete_pci_list(struct acpi_pci_device *list_head) |
{ |
struct acpi_pci_device *next; |
struct acpi_pci_device *previous; |
|
next = list_head; |
while (next) { |
previous = next; |
next = previous->next; |
ACPI_FREE(previous); |
} |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_hw_get_pci_device_info |
* |
* PARAMETERS: pci_id - Initial values for the PCI ID. May be |
* modified by this function. |
* pci_device - Handle for the PCI device object |
* bus_number - Where a PCI bridge bus number is returned |
* is_bridge - Return value, indicates if this PCI |
* device is a PCI bridge |
* |
* RETURN: Status |
* |
* DESCRIPTION: Get the device info for a single PCI device object. Get the |
* _ADR (contains PCI device and function numbers), and for PCI |
* bridge devices, get the bus number from PCI configuration |
* space. |
* |
******************************************************************************/ |
|
static acpi_status |
acpi_hw_get_pci_device_info(struct acpi_pci_id *pci_id, |
acpi_handle pci_device, |
u16 *bus_number, u8 *is_bridge) |
{ |
acpi_status status; |
acpi_object_type object_type; |
u64 return_value; |
u64 pci_value; |
|
/* We only care about objects of type Device */ |
|
status = acpi_get_type(pci_device, &object_type); |
if (ACPI_FAILURE(status)) { |
return (status); |
} |
|
if (object_type != ACPI_TYPE_DEVICE) { |
return (AE_OK); |
} |
|
/* We need an _ADR. Ignore device if not present */ |
|
status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, |
pci_device, &return_value); |
if (ACPI_FAILURE(status)) { |
return (AE_OK); |
} |
|
/* |
* From _ADR, get the PCI Device and Function and |
* update the PCI ID. |
*/ |
pci_id->device = ACPI_HIWORD(ACPI_LODWORD(return_value)); |
pci_id->function = ACPI_LOWORD(ACPI_LODWORD(return_value)); |
|
/* |
* If the previous device was a bridge, use the previous |
* device bus number |
*/ |
if (*is_bridge) { |
pci_id->bus = *bus_number; |
} |
|
/* |
* Get the bus numbers from PCI Config space: |
* |
* First, get the PCI header_type |
*/ |
*is_bridge = FALSE; |
status = acpi_os_read_pci_configuration(pci_id, |
PCI_CFG_HEADER_TYPE_REG, |
&pci_value, 8); |
if (ACPI_FAILURE(status)) { |
return (status); |
} |
|
/* We only care about bridges (1=pci_bridge, 2=card_bus_bridge) */ |
|
pci_value &= PCI_HEADER_TYPE_MASK; |
|
if ((pci_value != PCI_TYPE_BRIDGE) && |
(pci_value != PCI_TYPE_CARDBUS_BRIDGE)) { |
return (AE_OK); |
} |
|
/* Bridge: Get the Primary bus_number */ |
|
status = acpi_os_read_pci_configuration(pci_id, |
PCI_CFG_PRIMARY_BUS_NUMBER_REG, |
&pci_value, 8); |
if (ACPI_FAILURE(status)) { |
return (status); |
} |
|
*is_bridge = TRUE; |
pci_id->bus = (u16)pci_value; |
|
/* Bridge: Get the Secondary bus_number */ |
|
status = acpi_os_read_pci_configuration(pci_id, |
PCI_CFG_SECONDARY_BUS_NUMBER_REG, |
&pci_value, 8); |
if (ACPI_FAILURE(status)) { |
return (status); |
} |
|
*bus_number = (u16)pci_value; |
return (AE_OK); |
} |