1 files changed, 190 insertions, 127 deletions

diff --git a/drivers/pci/hotplug/acpi_pcihp.c b/drivers/pci/hotplug/acpi_pcihp.c
index 270a33cc08f..a94d850ae22 100644
--- a/drivers/pci/hotplug/acpi_pcihp.c
+++ b/drivers/pci/hotplug/acpi_pcihp.c
@@ -30,22 +30,21 @@
 #include <linux/types.h>
 #include <linux/pci.h>
 #include <linux/pci_hotplug.h>
-#include <acpi/acpi.h>
-#include <acpi/acpi_bus.h>
-#include <acpi/actypes.h>
+#include <linux/acpi.h>
+#include <linux/pci-acpi.h>
+#include <linux/slab.h>
 
 #define MY_NAME	"acpi_pcihp"
 
-#define dbg(fmt, arg...) do { if (debug_acpi) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __FUNCTION__ , ## arg); } while (0)
+#define dbg(fmt, arg...) do { if (debug_acpi) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0)
 #define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
 #define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
 #define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
 
 #define	METHOD_NAME__SUN	"_SUN"
-#define	METHOD_NAME__HPP	"_HPP"
 #define	METHOD_NAME_OSHP	"OSHP"
 
-static int debug_acpi;
+static bool debug_acpi;
 
 static acpi_status
 decode_type0_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
@@ -71,7 +70,7 @@ decode_type0_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
 	default:
 		printk(KERN_WARNING
 		       "%s: Type 0 Revision %d record not supported\n",
-		       __FUNCTION__, revision);
+		       __func__, revision);
 		return AE_ERROR;
 	}
 	return AE_OK;
@@ -100,7 +99,7 @@ decode_type1_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
 	default:
 		printk(KERN_WARNING
 		       "%s: Type 1 Revision %d record not supported\n",
-		       __FUNCTION__, revision);
+		       __func__, revision);
 		return AE_ERROR;
 	}
 	return AE_OK;
@@ -142,7 +141,7 @@ decode_type2_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
 	default:
 		printk(KERN_WARNING
 		       "%s: Type 2 Revision %d record not supported\n",
-		       __FUNCTION__, revision);
+		       __func__, revision);
 		return AE_ERROR;
 	}
 	return AE_OK;
@@ -203,7 +202,7 @@ acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
 			break;
 		default:
 			printk(KERN_ERR "%s: Type %d record not supported\n",
-			       __FUNCTION__, type);
+			       __func__, type);
 			status = AE_ERROR;
 			goto exit;
 		}
@@ -216,80 +215,41 @@ acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
 static acpi_status
 acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
 {
-	acpi_status		status;
-	u8			nui[4];
-	struct acpi_buffer	ret_buf = { 0, NULL};
-	struct acpi_buffer	string = { ACPI_ALLOCATE_BUFFER, NULL };
-	union acpi_object	*ext_obj, *package;
-	int			i, len = 0;
-
-	acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
+	acpi_status status;
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *package, *fields;
+	int i;
 
-	/* Clear the return buffer with zeros */
 	memset(hpp, 0, sizeof(struct hotplug_params));
 
-	/* get _hpp */
-	status = acpi_evaluate_object(handle, METHOD_NAME__HPP, NULL, &ret_buf);
-	switch (status) {
-	case AE_BUFFER_OVERFLOW:
-		ret_buf.pointer = kmalloc (ret_buf.length, GFP_KERNEL);
-		if (!ret_buf.pointer) {
-			printk(KERN_ERR "%s:%s alloc for _HPP fail\n",
-				__FUNCTION__, (char *)string.pointer);
-			kfree(string.pointer);
-			return AE_NO_MEMORY;
-		}
-		status = acpi_evaluate_object(handle, METHOD_NAME__HPP,
-				NULL, &ret_buf);
-		if (ACPI_SUCCESS(status))
-			break;
-	default:
-		if (ACPI_FAILURE(status)) {
-			pr_debug("%s:%s _HPP fail=0x%x\n", __FUNCTION__,
-				(char *)string.pointer, status);
-			kfree(string.pointer);
-			return status;
-		}
-	}
+	status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
+	if (ACPI_FAILURE(status))
+		return status;
 
-	ext_obj = (union acpi_object *) ret_buf.pointer;
-	if (ext_obj->type != ACPI_TYPE_PACKAGE) {
-		printk(KERN_ERR "%s:%s _HPP obj not a package\n", __FUNCTION__,
-				(char *)string.pointer);
+	package = (union acpi_object *) buffer.pointer;
+	if (package->type != ACPI_TYPE_PACKAGE ||
+	    package->package.count != 4) {
 		status = AE_ERROR;
-		goto free_and_return;
+		goto exit;
 	}
 
-	len = ext_obj->package.count;
-	package = (union acpi_object *) ret_buf.pointer;
-	for ( i = 0; (i < len) || (i < 4); i++) {
-		ext_obj = (union acpi_object *) &package->package.elements[i];
-		switch (ext_obj->type) {
-		case ACPI_TYPE_INTEGER:
-			nui[i] = (u8)ext_obj->integer.value;
-			break;
-		default:
-			printk(KERN_ERR "%s:%s _HPP obj type incorrect\n",
-				__FUNCTION__, (char *)string.pointer);
+	fields = package->package.elements;
+	for (i = 0; i < 4; i++) {
+		if (fields[i].type != ACPI_TYPE_INTEGER) {
 			status = AE_ERROR;
-			goto free_and_return;
+			goto exit;
 		}
 	}
 
 	hpp->t0 = &hpp->type0_data;
-	hpp->t0->cache_line_size = nui[0];
-	hpp->t0->latency_timer = nui[1];
-	hpp->t0->enable_serr = nui[2];
-	hpp->t0->enable_perr = nui[3];
-
-	pr_debug("  _HPP: cache_line_size=0x%x\n", hpp->t0->cache_line_size);
-	pr_debug("  _HPP: latency timer  =0x%x\n", hpp->t0->latency_timer);
-	pr_debug("  _HPP: enable SERR    =0x%x\n", hpp->t0->enable_serr);
-	pr_debug("  _HPP: enable PERR    =0x%x\n", hpp->t0->enable_perr);
+	hpp->t0->revision        = 1;
+	hpp->t0->cache_line_size = fields[0].integer.value;
+	hpp->t0->latency_timer   = fields[1].integer.value;
+	hpp->t0->enable_serr     = fields[2].integer.value;
+	hpp->t0->enable_perr     = fields[3].integer.value;
 
-free_and_return:
-	kfree(string.pointer);
-	kfree(ret_buf.pointer);
+exit:
+	kfree(buffer.pointer);
 	return status;
 }
 
@@ -299,7 +259,7 @@ free_and_return:
  *
  * @handle - the handle of the hotplug controller.
  */
-acpi_status acpi_run_oshp(acpi_handle handle)
+static acpi_status acpi_run_oshp(acpi_handle handle)
 {
 	acpi_status		status;
 	struct acpi_buffer	string = { ACPI_ALLOCATE_BUFFER, NULL };
@@ -311,104 +271,207 @@ acpi_status acpi_run_oshp(acpi_handle handle)
 	if (ACPI_FAILURE(status))
 		if (status != AE_NOT_FOUND)
 			printk(KERN_ERR "%s:%s OSHP fails=0x%x\n",
-			       __FUNCTION__, (char *)string.pointer, status);
+			       __func__, (char *)string.pointer, status);
 		else
 			dbg("%s:%s OSHP not found\n",
-			    __FUNCTION__, (char *)string.pointer);
+			    __func__, (char *)string.pointer);
 	else
-		pr_debug("%s:%s OSHP passes\n", __FUNCTION__,
+		pr_debug("%s:%s OSHP passes\n", __func__,
 			(char *)string.pointer);
 
 	kfree(string.pointer);
 	return status;
 }
-EXPORT_SYMBOL_GPL(acpi_run_oshp);
-
 
-
-/* acpi_get_hp_params_from_firmware
+/* pci_get_hp_params
  *
- * @bus - the pci_bus of the bus on which the device is newly added
+ * @dev - the pci_dev for which we want parameters
  * @hpp - allocated by the caller
  */
-acpi_status acpi_get_hp_params_from_firmware(struct pci_bus *bus,
-		struct hotplug_params *hpp)
+int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp)
 {
-	acpi_status status = AE_NOT_FOUND;
+	acpi_status status;
 	acpi_handle handle, phandle;
-	struct pci_bus *pbus = bus;
-	struct pci_dev *pdev;
-
-	do {
-		pdev = pbus->self;
-		if (!pdev) {
-			handle = acpi_get_pci_rootbridge_handle(
-				pci_domain_nr(pbus), pbus->number);
+	struct pci_bus *pbus;
+
+	handle = NULL;
+	for (pbus = dev->bus; pbus; pbus = pbus->parent) {
+		handle = acpi_pci_get_bridge_handle(pbus);
+		if (handle)
 			break;
-		}
-		handle = DEVICE_ACPI_HANDLE(&(pdev->dev));
-		pbus = pbus->parent;
-	} while (!handle);
+	}
 
 	/*
 	 * _HPP settings apply to all child buses, until another _HPP is
 	 * encountered. If we don't find an _HPP for the input pci dev,
 	 * look for it in the parent device scope since that would apply to
-	 * this pci dev. If we don't find any _HPP, use hardcoded defaults
+	 * this pci dev.
 	 */
 	while (handle) {
 		status = acpi_run_hpx(handle, hpp);
 		if (ACPI_SUCCESS(status))
-			break;
+			return 0;
 		status = acpi_run_hpp(handle, hpp);
 		if (ACPI_SUCCESS(status))
-			break;
-		if (acpi_root_bridge(handle))
+			return 0;
+		if (acpi_is_root_bridge(handle))
 			break;
 		status = acpi_get_parent(handle, &phandle);
 		if (ACPI_FAILURE(status))
 			break;
 		handle = phandle;
 	}
-	return status;
+	return -ENODEV;
 }
-EXPORT_SYMBOL_GPL(acpi_get_hp_params_from_firmware);
+EXPORT_SYMBOL_GPL(pci_get_hp_params);
 
-
-/* acpi_root_bridge - check to see if this acpi object is a root bridge
+/**
+ * acpi_get_hp_hw_control_from_firmware
+ * @dev: the pci_dev of the bridge that has a hotplug controller
+ * @flags: requested control bits for _OSC
  *
- * @handle - the acpi object in question.
+ * Attempt to take hotplug control from firmware.
  */
-int acpi_root_bridge(acpi_handle handle)
+int acpi_get_hp_hw_control_from_firmware(struct pci_dev *pdev, u32 flags)
 {
 	acpi_status status;
-	struct acpi_device_info *info;
-	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
-	int i;
+	acpi_handle chandle, handle;
+	struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
 
-	status = acpi_get_object_info(handle, &buffer);
-	if (ACPI_SUCCESS(status)) {
-		info = buffer.pointer;
-		if ((info->valid & ACPI_VALID_HID) &&
-			!strcmp(PCI_ROOT_HID_STRING,
-					info->hardware_id.value)) {
-			kfree(buffer.pointer);
-			return 1;
-		}
-		if (info->valid & ACPI_VALID_CID) {
-			for (i=0; i < info->compatibility_id.count; i++) {
-				if (!strcmp(PCI_ROOT_HID_STRING,
-					info->compatibility_id.id[i].value)) {
-					kfree(buffer.pointer);
-					return 1;
-				}
-			}
+	flags &= OSC_PCI_SHPC_NATIVE_HP_CONTROL;
+	if (!flags) {
+		err("Invalid flags %u specified!\n", flags);
+		return -EINVAL;
+	}
+
+	/*
+	 * 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 on a root
+	 * bridge preferentially (according to PCI fw spec). Later for
+	 * OSHP within the scope of the hotplug controller and its parents,
+	 * up to the host bridge under which this controller exists.
+	 */
+	handle = acpi_find_root_bridge_handle(pdev);
+	if (handle) {
+		acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
+		dbg("Trying to get hotplug control for %s\n",
+				(char *)string.pointer);
+		status = acpi_pci_osc_control_set(handle, &flags, flags);
+		if (ACPI_SUCCESS(status))
+			goto got_one;
+		if (status == AE_SUPPORT)
+			goto no_control;
+		kfree(string.pointer);
+		string = (struct acpi_buffer){ ACPI_ALLOCATE_BUFFER, NULL };
+	}
+
+	handle = ACPI_HANDLE(&pdev->dev);
+	if (!handle) {
+		/*
+		 * This hotplug controller was not listed in the ACPI name
+		 * space at all. Try to get acpi handle of parent pci bus.
+		 */
+		struct pci_bus *pbus;
+		for (pbus = pdev->bus; pbus; pbus = pbus->parent) {
+			handle = acpi_pci_get_bridge_handle(pbus);
+			if (handle)
+				break;
 		}
-		kfree(buffer.pointer);
 	}
+
+	while (handle) {
+		acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
+		dbg("Trying to get hotplug control for %s \n",
+		    (char *)string.pointer);
+		status = acpi_run_oshp(handle);
+		if (ACPI_SUCCESS(status))
+			goto got_one;
+		if (acpi_is_root_bridge(handle))
+			break;
+		chandle = handle;
+		status = acpi_get_parent(chandle, &handle);
+		if (ACPI_FAILURE(status))
+			break;
+	}
+no_control:
+	dbg("Cannot get control of hotplug hardware for pci %s\n",
+	    pci_name(pdev));
+	kfree(string.pointer);
+	return -ENODEV;
+got_one:
+	dbg("Gained control for hotplug HW for pci %s (%s)\n",
+	    pci_name(pdev), (char *)string.pointer);
+	kfree(string.pointer);
+	return 0;
+}
+EXPORT_SYMBOL(acpi_get_hp_hw_control_from_firmware);
+
+static int pcihp_is_ejectable(acpi_handle handle)
+{
+	acpi_status status;
+	unsigned long long removable;
+	if (!acpi_has_method(handle, "_ADR"))
+		return 0;
+	if (acpi_has_method(handle, "_EJ0"))
+		return 1;
+	status = acpi_evaluate_integer(handle, "_RMV", NULL, &removable);
+	if (ACPI_SUCCESS(status) && removable)
+		return 1;
 	return 0;
 }
-EXPORT_SYMBOL_GPL(acpi_root_bridge);
+
+/**
+ * acpi_pcihp_check_ejectable - check if handle is ejectable ACPI PCI slot
+ * @pbus: the PCI bus of the PCI slot corresponding to 'handle'
+ * @handle: ACPI handle to check
+ *
+ * Return 1 if handle is ejectable PCI slot, 0 otherwise.
+ */
+int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle)
+{
+	acpi_handle bridge_handle, parent_handle;
+
+	if (!(bridge_handle = acpi_pci_get_bridge_handle(pbus)))
+		return 0;
+	if ((ACPI_FAILURE(acpi_get_parent(handle, &parent_handle))))
+		return 0;
+	if (bridge_handle != parent_handle)
+		return 0;
+	return pcihp_is_ejectable(handle);
+}
+EXPORT_SYMBOL_GPL(acpi_pci_check_ejectable);
+
+static acpi_status
+check_hotplug(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+	int *found = (int *)context;
+	if (pcihp_is_ejectable(handle)) {
+		*found = 1;
+		return AE_CTRL_TERMINATE;
+	}
+	return AE_OK;
+}
+
+/**
+ * acpi_pci_detect_ejectable - check if the PCI bus has ejectable slots
+ * @handle - handle of the PCI bus to scan
+ *
+ * Returns 1 if the PCI bus has ACPI based ejectable slots, 0 otherwise.
+ */
+int acpi_pci_detect_ejectable(acpi_handle handle)
+{
+	int found = 0;
+
+	if (!handle)
+		return found;
+
+	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
+			    check_hotplug, NULL, (void *)&found, NULL);
+	return found;
+}
+EXPORT_SYMBOL_GPL(acpi_pci_detect_ejectable);
 
 module_param(debug_acpi, bool, 0644);
 MODULE_PARM_DESC(debug_acpi, "Debugging mode for ACPI enabled or not");