1 files changed, 230 insertions, 27 deletions

diff --git a/drivers/pci/hotplug/acpi_pcihp.c b/drivers/pci/hotplug/acpi_pcihp.c
index 39af9c3..51cb9f8 100644
--- a/drivers/pci/hotplug/acpi_pcihp.c
+++ b/drivers/pci/hotplug/acpi_pcihp.c
@@ -25,6 +25,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/pci.h>
@@ -33,10 +34,184 @@
 #include <acpi/actypes.h>
 #include "pci_hotplug.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 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 acpi_status
+decode_type0_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
+{
+	int i;
+	union acpi_object *fields = record->package.elements;
+	u32 revision = fields[1].integer.value;
+
+	switch (revision) {
+	case 1:
+		if (record->package.count != 6)
+			return AE_ERROR;
+		for (i = 2; i < 6; i++)
+			if (fields[i].type != ACPI_TYPE_INTEGER)
+				return AE_ERROR;
+		hpx->t0 = &hpx->type0_data;
+		hpx->t0->revision        = revision;
+		hpx->t0->cache_line_size = fields[2].integer.value;
+		hpx->t0->latency_timer   = fields[3].integer.value;
+		hpx->t0->enable_serr     = fields[4].integer.value;
+		hpx->t0->enable_perr     = fields[5].integer.value;
+		break;
+	default:
+		printk(KERN_WARNING
+		       "%s: Type 0 Revision %d record not supported\n",
+		       __FUNCTION__, revision);
+		return AE_ERROR;
+	}
+	return AE_OK;
+}
+
+static acpi_status
+decode_type1_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
+{
+	int i;
+	union acpi_object *fields = record->package.elements;
+	u32 revision = fields[1].integer.value;
+
+	switch (revision) {
+	case 1:
+		if (record->package.count != 5)
+			return AE_ERROR;
+		for (i = 2; i < 5; i++)
+			if (fields[i].type != ACPI_TYPE_INTEGER)
+				return AE_ERROR;
+		hpx->t1 = &hpx->type1_data;
+		hpx->t1->revision      = revision;
+		hpx->t1->max_mem_read  = fields[2].integer.value;
+		hpx->t1->avg_max_split = fields[3].integer.value;
+		hpx->t1->tot_max_split = fields[4].integer.value;
+		break;
+	default:
+		printk(KERN_WARNING
+		       "%s: Type 1 Revision %d record not supported\n",
+		       __FUNCTION__, revision);
+		return AE_ERROR;
+	}
+	return AE_OK;
+}
+
+static acpi_status
+decode_type2_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
+{
+	int i;
+	union acpi_object *fields = record->package.elements;
+	u32 revision = fields[1].integer.value;
+
+	switch (revision) {
+	case 1:
+		if (record->package.count != 18)
+			return AE_ERROR;
+		for (i = 2; i < 18; i++)
+			if (fields[i].type != ACPI_TYPE_INTEGER)
+				return AE_ERROR;
+		hpx->t2 = &hpx->type2_data;
+		hpx->t2->revision      = revision;
+		hpx->t2->unc_err_mask_and      = fields[2].integer.value;
+		hpx->t2->unc_err_mask_or       = fields[3].integer.value;
+		hpx->t2->unc_err_sever_and     = fields[4].integer.value;
+		hpx->t2->unc_err_sever_or      = fields[5].integer.value;
+		hpx->t2->cor_err_mask_and      = fields[6].integer.value;
+		hpx->t2->cor_err_mask_or       = fields[7].integer.value;
+		hpx->t2->adv_err_cap_and       = fields[8].integer.value;
+		hpx->t2->adv_err_cap_or        = fields[9].integer.value;
+		hpx->t2->pci_exp_devctl_and    = fields[10].integer.value;
+		hpx->t2->pci_exp_devctl_or     = fields[11].integer.value;
+		hpx->t2->pci_exp_lnkctl_and    = fields[12].integer.value;
+		hpx->t2->pci_exp_lnkctl_or     = fields[13].integer.value;
+		hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
+		hpx->t2->sec_unc_err_sever_or  = fields[15].integer.value;
+		hpx->t2->sec_unc_err_mask_and  = fields[16].integer.value;
+		hpx->t2->sec_unc_err_mask_or   = fields[17].integer.value;
+		break;
+	default:
+		printk(KERN_WARNING
+		       "%s: Type 2 Revision %d record not supported\n",
+		       __FUNCTION__, revision);
+		return AE_ERROR;
+	}
+	return AE_OK;
+}
+
+static acpi_status
+acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
+{
+	acpi_status status;
+	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+	union acpi_object *package, *record, *fields;
+	u32 type;
+	int i;
+
+	/* Clear the return buffer with zeros */
+	memset(hpx, 0, sizeof(struct hotplug_params));
+
+	status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
+	if (ACPI_FAILURE(status))
+		return status;
+
+	package = (union acpi_object *)buffer.pointer;
+	if (package->type != ACPI_TYPE_PACKAGE) {
+		status = AE_ERROR;
+		goto exit;
+	}
+
+	for (i = 0; i < package->package.count; i++) {
+		record = &package->package.elements[i];
+		if (record->type != ACPI_TYPE_PACKAGE) {
+			status = AE_ERROR;
+			goto exit;
+		}
+
+		fields = record->package.elements;
+		if (fields[0].type != ACPI_TYPE_INTEGER ||
+		    fields[1].type != ACPI_TYPE_INTEGER) {
+			status = AE_ERROR;
+			goto exit;
+		}
+
+		type = fields[0].integer.value;
+		switch (type) {
+		case 0:
+			status = decode_type0_hpx_record(record, hpx);
+			if (ACPI_FAILURE(status))
+				goto exit;
+			break;
+		case 1:
+			status = decode_type1_hpx_record(record, hpx);
+			if (ACPI_FAILURE(status))
+				goto exit;
+			break;
+		case 2:
+			status = decode_type2_hpx_record(record, hpx);
+			if (ACPI_FAILURE(status))
+				goto exit;
+			break;
+		default:
+			printk(KERN_ERR "%s: Type %d record not supported\n",
+			       __FUNCTION__, type);
+			status = AE_ERROR;
+			goto exit;
+		}
+	}
+ exit:
+	kfree(buffer.pointer);
+	return status;
+}
 
 static acpi_status
 acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
@@ -50,6 +225,9 @@ acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
 
 	acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
 
+	/* 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) {
@@ -58,7 +236,7 @@ acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
 		if (!ret_buf.pointer) {
 			printk(KERN_ERR "%s:%s alloc for _HPP fail\n",
 				__FUNCTION__, (char *)string.pointer);
-			acpi_os_free(string.pointer);
+			kfree(string.pointer);
 			return AE_NO_MEMORY;
 		}
 		status = acpi_evaluate_object(handle, METHOD_NAME__HPP,
@@ -69,7 +247,7 @@ acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
 		if (ACPI_FAILURE(status)) {
 			pr_debug("%s:%s _HPP fail=0x%x\n", __FUNCTION__,
 				(char *)string.pointer, status);
-			acpi_os_free(string.pointer);
+			kfree(string.pointer);
 			return status;
 		}
 	}
@@ -98,19 +276,20 @@ acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
 		}
 	}
 
-	hpp->cache_line_size = nui[0];
-	hpp->latency_timer = nui[1];
-	hpp->enable_serr = nui[2];
-	hpp->enable_perr = nui[3];
+	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->cache_line_size);
-	pr_debug("  _HPP: latency timer  =0x%x\n", hpp->latency_timer);
-	pr_debug("  _HPP: enable SERR    =0x%x\n", hpp->enable_serr);
-	pr_debug("  _HPP: enable PERR    =0x%x\n", hpp->enable_perr);
+	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);
 
 free_and_return:
-	acpi_os_free(string.pointer);
-	acpi_os_free(ret_buf.pointer);
+	kfree(string.pointer);
+	kfree(ret_buf.pointer);
 	return status;
 }
 
@@ -130,13 +309,17 @@ acpi_status acpi_run_oshp(acpi_handle handle)
 	/* run OSHP */
 	status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL);
 	if (ACPI_FAILURE(status))
-		printk(KERN_ERR "%s:%s OSHP fails=0x%x\n", __FUNCTION__,
-			(char *)string.pointer, status);
+		if (status != AE_NOT_FOUND)
+			printk(KERN_ERR "%s:%s OSHP fails=0x%x\n",
+			       __FUNCTION__, (char *)string.pointer, status);
+		else
+			dbg("%s:%s OSHP not found\n",
+			    __FUNCTION__, (char *)string.pointer);
 	else
 		pr_debug("%s:%s OSHP passes\n", __FUNCTION__,
 			(char *)string.pointer);
 
-	acpi_os_free(string.pointer);
+	kfree(string.pointer);
 	return status;
 }
 EXPORT_SYMBOL_GPL(acpi_run_oshp);
@@ -145,14 +328,27 @@ EXPORT_SYMBOL_GPL(acpi_run_oshp);
 
 /* acpi_get_hp_params_from_firmware
  *
- * @dev - the pci_dev of the newly added device
+ * @bus - the pci_bus of the bus on which the device is newly added
  * @hpp - allocated by the caller
  */
-acpi_status acpi_get_hp_params_from_firmware(struct pci_dev *dev,
+acpi_status acpi_get_hp_params_from_firmware(struct pci_bus *bus,
 		struct hotplug_params *hpp)
 {
 	acpi_status status = AE_NOT_FOUND;
-	struct pci_dev *pdev = dev;
+	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);
+			break;
+		}
+		handle = DEVICE_ACPI_HANDLE(&(pdev->dev));
+		pbus = pbus->parent;
+	} while (!handle);
 
 	/*
 	 * _HPP settings apply to all child buses, until another _HPP is
@@ -160,15 +356,19 @@ acpi_status acpi_get_hp_params_from_firmware(struct pci_dev *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
 	 */
-	while (pdev && (ACPI_FAILURE(status))) {
-		acpi_handle handle = DEVICE_ACPI_HANDLE(&(pdev->dev));
-		if (!handle)
+	while (handle) {
+		status = acpi_run_hpx(handle, hpp);
+		if (ACPI_SUCCESS(status))
 			break;
 		status = acpi_run_hpp(handle, hpp);
-		if (!(pdev->bus->parent))
+		if (ACPI_SUCCESS(status))
 			break;
-		/* Check if a parent object supports _HPP */
-		pdev = pdev->bus->parent->self;
+		if (acpi_root_bridge(handle))
+			break;
+		status = acpi_get_parent(handle, &phandle);
+		if (ACPI_FAILURE(status))
+			break;
+		handle = phandle;
 	}
 	return status;
 }
@@ -192,20 +392,23 @@ int acpi_root_bridge(acpi_handle handle)
 		if ((info->valid & ACPI_VALID_HID) &&
 			!strcmp(PCI_ROOT_HID_STRING,
 					info->hardware_id.value)) {
-			acpi_os_free(buffer.pointer);
+			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)) {
-					acpi_os_free(buffer.pointer);
+					kfree(buffer.pointer);
 					return 1;
 				}
 			}
 		}
-		acpi_os_free(buffer.pointer);
+		kfree(buffer.pointer);
 	}
 	return 0;
 }
 EXPORT_SYMBOL_GPL(acpi_root_bridge);
+
+module_param(debug_acpi, bool, 0644);
+MODULE_PARM_DESC(debug_acpi, "Debugging mode for ACPI enabled or not");