example:

static const struct dmi_system_id yyy[] = {
	{
		.ident = "<Platform ident string>",
		.callback = <handler>,
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "<system vendor>"),
			DMI_MATCH(DMI_PRODUCT_NAME, "<product name>"),
			DMI_MATCH(DMI_PRODUCT_VERSION, "product version"),
		},
	},
	{ }
};

static struct pci_ops ecam_pci_ops = {
	.map_bus = pci_mcfg_dev_base,
	.read = xxxx_ecam_config_read,
	.write = xxxx_ecam_config_write,
};
DECLARE_ACPI_MCFG_FIXUP(yyy, &ecam_pci_ops, <domain_nr>, <bus_nr>);

Note, that more custom actions can be done via DMI callback hook.

Signed-off-by: Tomasz Nowicki <redacted>
---
 drivers/acpi/mcfg.c               | 35
+++++++++++++++++++++++++++++++++--
 include/asm-generic/vmlinux.lds.h |  7 +++++++
 include/linux/ecam.h              | 17 +++++++++++++++++
 3 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/mcfg.c b/drivers/acpi/mcfg.c index

a9b2231..6d0194d 100644

--- a/drivers/acpi/mcfg.c
+++ b/drivers/acpi/mcfg.c

@@ -8,6 +8,7 @@
  */

 #include <linux/acpi.h>
+#include <linux/dmi.h>
 #include <linux/ecam.h>
 #include <linux/pci.h>
 #include <linux/pci-acpi.h>

@@ -34,6 +35,31 @@ int __weak raw_pci_write(unsigned int domain,

unsigned int bus,
 	return PCIBIOS_DEVICE_NOT_FOUND;
 }

+extern struct pci_mcfg_fixup __start_acpi_mcfg_fixups[]; extern struct
+pci_mcfg_fixup __end_acpi_mcfg_fixups[];
+
+static struct pci_ops *pci_mcfg_check_quirks(int domain, int
+bus_number) {
+	struct pci_mcfg_fixup *fixup;
+
+	fixup = __start_acpi_mcfg_fixups;
+	while (fixup < __end_acpi_mcfg_fixups) {
+		if (dmi_check_system(fixup->system) &&
+		    (fixup->domain == domain ||
+		     fixup->domain == PCI_MCFG_DOMAIN_ANY) &&
+		    (fixup->bus_number == bus_number ||
+		     fixup->bus_number == PCI_MCFG_BUS_ANY)) {
+			pr_info(PREFIX "Fixup applied: Platform [%s] domain
[%d] bus number [%d]\n",
+				fixup->system->ident, fixup->domain,
+				fixup->bus_number);
+			return fixup->ops;
+		}
+		++fixup;
+	}
+
+	return NULL;
+}
+
 void __iomem *
 pci_mcfg_dev_base(struct pci_bus *bus, unsigned int devfn, int offset)
{ @@ -56,10 +82,15 @@ static struct pci_ops default_pci_mcfg_ops = {

 struct pci_ops *pci_mcfg_get_ops(int domain, int bus)  {
+	struct pci_ops *pci_mcfg_ops_quirk;
+
 	/*
-	 * TODO: Match against platform specific quirks and return
-	 * corresponding PCI config space accessor set.
+	 * Match against platform specific quirks and return
corresponding
+	 * PCI config space accessor set.
 	 */
+	pci_mcfg_ops_quirk = pci_mcfg_check_quirks(domain, bus);
+	if (pci_mcfg_ops_quirk)
+		return pci_mcfg_ops_quirk;

 	return &default_pci_mcfg_ops;
 }

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-

generic/vmlinux.lds.h
index c4bd0e2..c93fc97 100644

--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h

@@ -298,6 +298,13 @@
 		VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;	\
 	}								\
 									\
+	/* ACPI MCFG quirks */						\
+	.acpi_fixup        : AT(ADDR(.acpi_fixup) - LOAD_OFFSET) {	\
+		VMLINUX_SYMBOL(__start_acpi_mcfg_fixups) = .;		\
+		*(.acpi_fixup_mcfg)					\
+		VMLINUX_SYMBOL(__end_acpi_mcfg_fixups) = .;		\
+	}								\
+									\
 	/* Built-in firmware blobs */					\
 	.builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {	\
 		VMLINUX_SYMBOL(__start_builtin_fw) = .;			\

diff --git a/include/linux/ecam.h b/include/linux/ecam.h index

e0f322e..1319fa8 100644

--- a/include/linux/ecam.h
+++ b/include/linux/ecam.h

@@ -20,6 +20,23 @@ struct pci_mmcfg_region {
 	bool hot_added;
 };

+struct pci_mcfg_fixup {
+	const struct dmi_system_id *system;
+	struct pci_ops *ops;
+	int domain;
+	int bus_number;
+};
+
+#define PCI_MCFG_DOMAIN_ANY	-1
+#define PCI_MCFG_BUS_ANY	-1
+
+/* Designate a routine to fix up buggy MCFG */
+#define DECLARE_ACPI_MCFG_FIXUP(system, ops, dom, bus)

	\
+	static const struct pci_mcfg_fixup
__mcfg_fixup_##system##dom##bus\
+	 __used	__attribute__((__section__(".acpi_fixup_mcfg"),
	\
+				aligned((sizeof(void *))))) =		\
+	{ system, ops, dom, bus };
+
 struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start,
 						   int end, u64 addr);
--
1.9.1

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