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2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d 
 kernel/drivers/acpi/pci_root.c
....@@ -1,22 +1,9 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *  pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
34  *
45  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
56  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6
- *
7
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8
- *
9
- *  This program is free software; you can redistribute it and/or modify
10
- *  it under the terms of the GNU General Public License as published by
11
- *  the Free Software Foundation; either version 2 of the License, or (at
12
- *  your option) any later version.
13
- *
14
- *  This program is distributed in the hope that it will be useful, but
15
- *  WITHOUT ANY WARRANTY; without even the implied warranty of
16
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17
- *  General Public License for more details.
18
- *
19
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
207  */
218 
229 #include <linux/kernel.h>
....@@ -28,7 +15,6 @@
2815 #include <linux/pm_runtime.h>
2916 #include <linux/pci.h>
3017 #include <linux/pci-acpi.h>
31
-#include <linux/pci-aspm.h>
3218 #include <linux/dmar.h>
3319 #include <linux/acpi.h>
3420 #include <linux/slab.h>
....@@ -38,8 +24,6 @@
3824 
3925 #include "internal.h"
4026 
41
-#define _COMPONENT		ACPI_PCI_COMPONENT
42
-ACPI_MODULE_NAME("pci_root");
4327 #define ACPI_PCI_ROOT_CLASS		"pci_bridge"
4428 #define ACPI_PCI_ROOT_DEVICE_NAME	"PCI Root Bridge"
4529 static int acpi_pci_root_add(struct acpi_device *device,
....@@ -76,7 +60,7 @@
7660 
7761 /**
7862  * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
79
- * @handle - the ACPI CA node in question.
63
+ * @handle:  the ACPI CA node in question.
8064  *
8165  * Note: we could make this API take a struct acpi_device * instead, but
8266  * for now, it's more convenient to operate on an acpi_handle.
....@@ -145,6 +129,8 @@
145129 	{ OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
146130 	{ OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
147131 	{ OSC_PCI_MSI_SUPPORT, "MSI" },
132
+	{ OSC_PCI_EDR_SUPPORT, "EDR" },
133
+	{ OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" },
148134 };
149135 
150136 static struct pci_osc_bit_struct pci_osc_control_bit[] = {
....@@ -154,6 +140,7 @@
154140 	{ OSC_PCI_EXPRESS_AER_CONTROL, "AER" },
155141 	{ OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" },
156142 	{ OSC_PCI_EXPRESS_LTR_CONTROL, "LTR" },
143
+	{ OSC_PCI_EXPRESS_DPC_CONTROL, "DPC" },
157144 };
158145 
159146 static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word,
....@@ -166,7 +153,7 @@
166153 	buf[0] = '\0';
167154 	for (i = 0, entry = table; i < size; i++, entry++)
168155 		if (word & entry->bit)
169
-			len += snprintf(buf + len, sizeof(buf) - len, "%s%s",
156
+			len += scnprintf(buf + len, sizeof(buf) - len, "%s%s",
170157 					len ? " " : "", entry->desc);
171158 
172159 	dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf);
....@@ -421,7 +408,8 @@
421408 }
422409 EXPORT_SYMBOL(acpi_pci_osc_control_set);
423410 
424
-static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
411
+static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,
412
+				 bool is_pcie)
425413 {
426414 	u32 support, control, requested;
427415 	acpi_status status;
....@@ -445,20 +433,28 @@
445433 	 * PCI domains, so we indicate this in _OSC support capabilities.
446434 	 */
447435 	support = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
436
+	support |= OSC_PCI_HPX_TYPE_3_SUPPORT;
448437 	if (pci_ext_cfg_avail())
449438 		support |= OSC_PCI_EXT_CONFIG_SUPPORT;
450439 	if (pcie_aspm_support_enabled())
451440 		support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT;
452441 	if (pci_msi_enabled())
453442 		support |= OSC_PCI_MSI_SUPPORT;
443
+	if (IS_ENABLED(CONFIG_PCIE_EDR))
444
+		support |= OSC_PCI_EDR_SUPPORT;
454445 
455446 	decode_osc_support(root, "OS supports", support);
456447 	status = acpi_pci_osc_support(root, support);
457448 	if (ACPI_FAILURE(status)) {
449
+		*no_aspm = 1;
450
+
451
+		/* _OSC is optional for PCI host bridges */
452
+		if ((status == AE_NOT_FOUND) && !is_pcie)
453
+			return;
454
+
458455 		dev_info(&device->dev, "_OSC failed (%s)%s\n",
459456 			 acpi_format_exception(status),
460457 			 pcie_aspm_support_enabled() ? "; disabling ASPM" : "");
461
-		*no_aspm = 1;
462458 		return;
463459 	}
464460 
....@@ -485,13 +481,17 @@
485481 	if (IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC))
486482 		control |= OSC_PCI_SHPC_NATIVE_HP_CONTROL;
487483 
488
-	if (pci_aer_available()) {
489
-		if (aer_acpi_firmware_first())
490
-			dev_info(&device->dev,
491
-				 "PCIe AER handled by firmware\n");
492
-		else
493
-			control |= OSC_PCI_EXPRESS_AER_CONTROL;
494
-	}
484
+	if (pci_aer_available())
485
+		control |= OSC_PCI_EXPRESS_AER_CONTROL;
486
+
487
+	/*
488
+	 * Per the Downstream Port Containment Related Enhancements ECN to
489
+	 * the PCI Firmware Spec, r3.2, sec 4.5.1, table 4-5,
490
+	 * OSC_PCI_EXPRESS_DPC_CONTROL indicates the OS supports both DPC
491
+	 * and EDR.
492
+	 */
493
+	if (IS_ENABLED(CONFIG_PCIE_DPC) && IS_ENABLED(CONFIG_PCIE_EDR))
494
+		control |= OSC_PCI_EXPRESS_DPC_CONTROL;
495495 
496496 	requested = control;
497497 	status = acpi_pci_osc_control_set(handle, &control,
....@@ -534,6 +534,7 @@
534534 	acpi_handle handle = device->handle;
535535 	int no_aspm = 0;
536536 	bool hotadd = system_state == SYSTEM_RUNNING;
537
+	bool is_pcie;
537538 
538539 	root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
539540 	if (!root)
....@@ -591,7 +592,8 @@
591592 
592593 	root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);
593594 
594
-	negotiate_os_control(root, &no_aspm);
595
+	is_pcie = strcmp(acpi_device_hid(device), "PNP0A08") == 0;
596
+	negotiate_os_control(root, &no_aspm, is_pcie);
595597 
596598 	/*
597599 	 * TBD: Need PCI interface for enumeration/configuration of roots.
....@@ -884,6 +886,7 @@
884886 	int node = acpi_get_node(device->handle);
885887 	struct pci_bus *bus;
886888 	struct pci_host_bridge *host_bridge;
889
+	union acpi_object *obj;
887890 
888891 	info->root = root;
889892 	info->bridge = device;
....@@ -919,6 +922,19 @@
919922 		host_bridge->native_pme = 0;
920923 	if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL))
921924 		host_bridge->native_ltr = 0;
925
+	if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL))
926
+		host_bridge->native_dpc = 0;
927
+
928
+	/*
929
+	 * Evaluate the "PCI Boot Configuration" _DSM Function.  If it
930
+	 * exists and returns 0, we must preserve any PCI resource
931
+	 * assignments made by firmware for this host bridge.
932
+	 */
933
+	obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 1,
934
+				DSM_PCI_PRESERVE_BOOT_CONFIG, NULL);
935
+	if (obj && obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 0)
936
+		host_bridge->preserve_config = 1;
937
+	ACPI_FREE(obj);
922938 
923939 	pci_scan_child_bus(bus);
924940 	pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info,