[PATCH] PCI Hotplug: add common acpi functions to core

shpchprm_acpi.c and pciehprm_acpi.c are nearly identical.  In addition,
there are functions in both these files that are also in acpiphp_glue.c.
This patch will remove duplicate functions from shpchp, pciehp, and
acpiphp and move this functionality to pci_hotplug, as it is not
hardware specific.  Get rid of shpchprm* and pciehprm* files since they
are no longer needed.  shpchprm_nonacpi.c and pciehprm_nonacpi.c are
identical, as well as shpchprm_legacy.c and can be replaced with a
macro.

This patch also changes acpiphp to use the common hpp code.

Signed-off-by:  Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 73 insertions, 1 deletions

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 2427b0862cbf..22dcd12e4c1c 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -38,7 +38,10 @@
 
 #include "../pci.h"
 #include "pciehp.h"
-
+#include <acpi/acpi.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/actypes.h>
+#include <linux/pci-acpi.h>
 #ifdef DEBUG
 #define DBG_K_TRACE_ENTRY      ((unsigned int)0x00000001)       /* On function entry */
 #define DBG_K_TRACE_EXIT       ((unsigned int)0x00000002)       /* On function exit */
@@ -1236,6 +1239,75 @@ static struct hpc_ops pciehp_hpc_ops = {
         .check_lnk_status               = hpc_check_lnk_status,
 };
 
+#ifdef CONFIG_ACPI
+int pciehp_acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev)
+{
+        acpi_status status;
+        acpi_handle chandle, handle = DEVICE_ACPI_HANDLE(&(dev->dev));
+        struct pci_dev *pdev = dev;
+        struct pci_bus *parent;
+        u8 *path_name = NULL;
+
+        /*
+         * Per PCI firmware specification, we should run the ACPI _OSC
+         * method to get control of hotplug hardware before using it.
+         * If an _OSC is missing, we look for an OSHP to do the same thing.
+         * To handle different BIOS behavior, we look for _OSC and OSHP
+         * within the scope of the hotplug controller and its parents, upto
+         * the host bridge under which this controller exists.
+         */
+        while (!handle) {
+                /*
+                 * This hotplug controller was not listed in the ACPI name
+                 * space at all. Try to get acpi handle of parent pci bus.
+                 */
+                if (!pdev || !pdev->bus->parent)
+                        break;
+                parent = pdev->bus->parent;
+                dbg("Could not find %s in acpi namespace, trying parent\n",
+                                pci_name(pdev));
+                if (!parent->self)
+                        /* Parent must be a host bridge */
+                        handle = acpi_get_pci_rootbridge_handle(
+                                        pci_domain_nr(parent),
+                                        parent->number);
+                else
+                        handle = DEVICE_ACPI_HANDLE(
+                                        &(parent->self->dev));
+                pdev = parent->self;
+        }
+
+        while (handle) {
+                path_name = acpi_path_name(handle);
+                dbg("Trying to get hotplug control for %s \n", path_name);
+                status = pci_osc_control_set(handle,
+                                OSC_PCI_EXPRESS_NATIVE_HP_CONTROL);
+                if (status == AE_NOT_FOUND)
+                        status = acpi_run_oshp(handle);
+                if (ACPI_SUCCESS(status)) {
+                        dbg("Gained control for hotplug HW for pci %s (%s)\n",
+                                pci_name(dev), path_name);
+                        acpi_os_free(path_name);
+                        return 0;
+                }
+                if (acpi_root_bridge(handle))
+                        break;
+                chandle = handle;
+                status = acpi_get_parent(chandle, &handle);
+                if (ACPI_FAILURE(status))
+                        break;
+        }
+
+        err("Cannot get control of hotplug hardware for pci %s\n",
+                        pci_name(dev));
+        if (path_name)
+                acpi_os_free(path_name);
+        return -1;
+}
+#endif
+
+
+
 int pcie_init(struct controller * ctrl, struct pcie_device *dev)
 {
         struct php_ctlr_state_s *php_ctlr, *p;