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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c 
 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>
....@@ -28,18 +15,13 @@
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>
3521 #include <linux/dmi.h>
3622 #include <linux/platform_data/x86/apple.h>
37
-#include <acpi/apei.h>	/* for acpi_hest_init() */
38
-
3923 #include "internal.h"
4024 
41
-#define _COMPONENT		ACPI_PCI_COMPONENT
42
-ACPI_MODULE_NAME("pci_root");
4325 #define ACPI_PCI_ROOT_CLASS		"pci_bridge"
4426 #define ACPI_PCI_ROOT_DEVICE_NAME	"PCI Root Bridge"
4527 static int acpi_pci_root_add(struct acpi_device *device,
....@@ -76,7 +58,7 @@
7658 
7759 /**
7860  * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
79
- * @handle - the ACPI CA node in question.
61
+ * @handle:  the ACPI CA node in question.
8062  *
8163  * Note: we could make this API take a struct acpi_device * instead, but
8264  * for now, it's more convenient to operate on an acpi_handle.
....@@ -145,6 +127,8 @@
145127 	{ OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
146128 	{ OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
147129 	{ OSC_PCI_MSI_SUPPORT, "MSI" },
130
+	{ OSC_PCI_EDR_SUPPORT, "EDR" },
131
+	{ OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" },
148132 };
149133 
150134 static struct pci_osc_bit_struct pci_osc_control_bit[] = {
....@@ -154,6 +138,7 @@
154138 	{ OSC_PCI_EXPRESS_AER_CONTROL, "AER" },
155139 	{ OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" },
156140 	{ OSC_PCI_EXPRESS_LTR_CONTROL, "LTR" },
141
+	{ OSC_PCI_EXPRESS_DPC_CONTROL, "DPC" },
157142 };
158143 
159144 static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word,
....@@ -166,7 +151,7 @@
166151 	buf[0] = '\0';
167152 	for (i = 0, entry = table; i < size; i++, entry++)
168153 		if (word & entry->bit)
169
-			len += snprintf(buf + len, sizeof(buf) - len, "%s%s",
154
+			len += scnprintf(buf + len, sizeof(buf) - len, "%s%s",
170155 					len ? " " : "", entry->desc);
171156 
172157 	dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf);
....@@ -421,7 +406,8 @@
421406 }
422407 EXPORT_SYMBOL(acpi_pci_osc_control_set);
423408 
424
-static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
409
+static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,
410
+				 bool is_pcie)
425411 {
426412 	u32 support, control, requested;
427413 	acpi_status status;
....@@ -445,20 +431,28 @@
445431 	 * PCI domains, so we indicate this in _OSC support capabilities.
446432 	 */
447433 	support = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
434
+	support |= OSC_PCI_HPX_TYPE_3_SUPPORT;
448435 	if (pci_ext_cfg_avail())
449436 		support |= OSC_PCI_EXT_CONFIG_SUPPORT;
450437 	if (pcie_aspm_support_enabled())
451438 		support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT;
452439 	if (pci_msi_enabled())
453440 		support |= OSC_PCI_MSI_SUPPORT;
441
+	if (IS_ENABLED(CONFIG_PCIE_EDR))
442
+		support |= OSC_PCI_EDR_SUPPORT;
454443 
455444 	decode_osc_support(root, "OS supports", support);
456445 	status = acpi_pci_osc_support(root, support);
457446 	if (ACPI_FAILURE(status)) {
447
+		*no_aspm = 1;
448
+
449
+		/* _OSC is optional for PCI host bridges */
450
+		if ((status == AE_NOT_FOUND) && !is_pcie)
451
+			return;
452
+
458453 		dev_info(&device->dev, "_OSC failed (%s)%s\n",
459454 			 acpi_format_exception(status),
460455 			 pcie_aspm_support_enabled() ? "; disabling ASPM" : "");
461
-		*no_aspm = 1;
462456 		return;
463457 	}
464458 
....@@ -485,13 +479,17 @@
485479 	if (IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC))
486480 		control |= OSC_PCI_SHPC_NATIVE_HP_CONTROL;
487481 
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
-	}
482
+	if (pci_aer_available())
483
+		control |= OSC_PCI_EXPRESS_AER_CONTROL;
484
+
485
+	/*
486
+	 * Per the Downstream Port Containment Related Enhancements ECN to
487
+	 * the PCI Firmware Spec, r3.2, sec 4.5.1, table 4-5,
488
+	 * OSC_PCI_EXPRESS_DPC_CONTROL indicates the OS supports both DPC
489
+	 * and EDR.
490
+	 */
491
+	if (IS_ENABLED(CONFIG_PCIE_DPC) && IS_ENABLED(CONFIG_PCIE_EDR))
492
+		control |= OSC_PCI_EXPRESS_DPC_CONTROL;
495493 
496494 	requested = control;
497495 	status = acpi_pci_osc_control_set(handle, &control,
....@@ -534,6 +532,7 @@
534532 	acpi_handle handle = device->handle;
535533 	int no_aspm = 0;
536534 	bool hotadd = system_state == SYSTEM_RUNNING;
535
+	bool is_pcie;
537536 
538537 	root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
539538 	if (!root)
....@@ -591,7 +590,8 @@
591590 
592591 	root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);
593592 
594
-	negotiate_os_control(root, &no_aspm);
593
+	is_pcie = strcmp(acpi_device_hid(device), "PNP0A08") == 0;
594
+	negotiate_os_control(root, &no_aspm, is_pcie);
595595 
596596 	/*
597597 	 * TBD: Need PCI interface for enumeration/configuration of roots.
....@@ -884,6 +884,7 @@
884884 	int node = acpi_get_node(device->handle);
885885 	struct pci_bus *bus;
886886 	struct pci_host_bridge *host_bridge;
887
+	union acpi_object *obj;
887888 
888889 	info->root = root;
889890 	info->bridge = device;
....@@ -919,6 +920,19 @@
919920 		host_bridge->native_pme = 0;
920921 	if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL))
921922 		host_bridge->native_ltr = 0;
923
+	if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL))
924
+		host_bridge->native_dpc = 0;
925
+
926
+	/*
927
+	 * Evaluate the "PCI Boot Configuration" _DSM Function.  If it
928
+	 * exists and returns 0, we must preserve any PCI resource
929
+	 * assignments made by firmware for this host bridge.
930
+	 */
931
+	obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 1,
932
+				DSM_PCI_PRESERVE_BOOT_CONFIG, NULL);
933
+	if (obj && obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 0)
934
+		host_bridge->preserve_config = 1;
935
+	ACPI_FREE(obj);
922936 
923937 	pci_scan_child_bus(bus);
924938 	pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info,
....@@ -934,7 +948,6 @@
934948 
935949 void __init acpi_pci_root_init(void)
936950 {
937
-	acpi_hest_init();
938951 	if (acpi_pci_disabled)
939952 		return;
940953