linux-kernel - [PATCH 2/2] x86/pci: Add Hygon Dhyana support to PCI and north bridge

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Message-Id: <5f8877bd413f2ea0833378dd5454df0720e1c0df.1537885177.git.puwen@hygon.cn>
Date:   Tue, 25 Sep 2018 22:46:11 +0800
From:   Pu Wen <puwen@...on.cn>
To:     bp@...en8.de, bhelgaas@...gle.com, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com, x86@...nel.org,
        thomas.lendacky@....com, helgaas@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-pci@...r.kernel.org, Pu Wen <puwen@...on.cn>
Subject: [PATCH 2/2] x86/pci: Add Hygon Dhyana support to PCI and north bridge

As Hygon registered its PCI Vendor ID as a new one 0x1d94, and there
are PCI Devices 0x1450/0x1463/0x1464 for Host bridge on Hygon Dhyana
platform, so add Hygon Dhyana support to the PCI and north bridge
subsystem by using the code path of AMD family 17h.

Signed-off-by: Pu Wen <puwen@...on.cn>
Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>	# pci_ids.h
---
 arch/x86/kernel/amd_nb.c | 41 +++++++++++++++++++++++++++++++++++------
 arch/x86/pci/amd_bus.c   |  6 ++++--
 include/linux/pci_ids.h  |  2 ++
 3 files changed, 41 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c
index b51c6b1..b6ceaf0 100644
--- a/arch/x86/kernel/amd_nb.c
+++ b/arch/x86/kernel/amd_nb.c
@@ -61,6 +61,21 @@ static const struct pci_device_id amd_nb_link_ids[] = {
 	{}
 };
 
+static const struct pci_device_id hygon_root_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_ROOT) },
+	{}
+};
+
+const struct pci_device_id hygon_nb_misc_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_DF_F3) },
+	{}
+};
+
+static const struct pci_device_id hygon_nb_link_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_DF_F4) },
+	{}
+};
+
 const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[] __initconst = {
 	{ 0x00, 0x18, 0x20 },
 	{ 0xff, 0x00, 0x20 },
@@ -197,12 +212,21 @@ int amd_cache_northbridges(void)
 	u16 i = 0;
 	struct amd_northbridge *nb;
 	struct pci_dev *root, *misc, *link;
+	const struct pci_device_id *root_ids = amd_root_ids;
+	const struct pci_device_id *misc_ids = amd_nb_misc_ids;
+	const struct pci_device_id *link_ids = amd_nb_link_ids;
+
+	if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
+		root_ids = hygon_root_ids;
+		misc_ids = hygon_nb_misc_ids;
+		link_ids = hygon_nb_link_ids;
+	}
 
 	if (amd_northbridges.num)
 		return 0;
 
 	misc = NULL;
-	while ((misc = next_northbridge(misc, amd_nb_misc_ids)) != NULL)
+	while ((misc = next_northbridge(misc, misc_ids)) != NULL)
 		i++;
 
 	if (!i)
@@ -218,11 +242,11 @@ int amd_cache_northbridges(void)
 	link = misc = root = NULL;
 	for (i = 0; i != amd_northbridges.num; i++) {
 		node_to_amd_nb(i)->root = root =
-			next_northbridge(root, amd_root_ids);
+			next_northbridge(root, root_ids);
 		node_to_amd_nb(i)->misc = misc =
-			next_northbridge(misc, amd_nb_misc_ids);
+			next_northbridge(misc, misc_ids);
 		node_to_amd_nb(i)->link = link =
-			next_northbridge(link, amd_nb_link_ids);
+			next_northbridge(link, link_ids);
 	}
 
 	if (amd_gart_present())
@@ -263,13 +287,17 @@ bool __init early_is_amd_nb(u32 device)
 {
 	const struct pci_device_id *id;
 	u32 vendor = device & 0xffff;
+	const struct pci_device_id *misc_ids = amd_nb_misc_ids;
 
 	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
 	    boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
 		return false;
 
+	if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
+		misc_ids = hygon_nb_misc_ids;
+
 	device >>= 16;
-	for (id = amd_nb_misc_ids; id->vendor; id++)
+	for (id = misc_ids; id->vendor; id++)
 		if (vendor == id->vendor && device == id->device)
 			return true;
 	return false;
@@ -281,7 +309,8 @@ struct resource *amd_get_mmconfig_range(struct resource *res)
 	u64 base, msr;
 	unsigned int segn_busn_bits;
 
-	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
+	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
+	    boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
 		return NULL;
 
 	/* assume all cpus from fam10h have mmconfig */
diff --git a/arch/x86/pci/amd_bus.c b/arch/x86/pci/amd_bus.c
index 649bdde..bfa50e6 100644
--- a/arch/x86/pci/amd_bus.c
+++ b/arch/x86/pci/amd_bus.c
@@ -93,7 +93,8 @@ static int __init early_root_info_init(void)
 		vendor = id & 0xffff;
 		device = (id>>16) & 0xffff;
 
-		if (vendor != PCI_VENDOR_ID_AMD)
+		if (vendor != PCI_VENDOR_ID_AMD &&
+		    vendor != PCI_VENDOR_ID_HYGON)
 			continue;
 
 		if (hb_probes[i].device == device) {
@@ -390,7 +391,8 @@ static int __init pci_io_ecs_init(void)
 
 static int __init amd_postcore_init(void)
 {
-	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
+	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
+	    boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
 		return 0;
 
 	early_root_info_init();
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index d157983..8a0841c 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -2561,6 +2561,8 @@
 
 #define PCI_VENDOR_ID_AMAZON		0x1d0f
 
+#define PCI_VENDOR_ID_HYGON		0x1d94
+
 #define PCI_VENDOR_ID_TEKRAM		0x1de1
 #define PCI_DEVICE_ID_TEKRAM_DC290	0xdc29
 
-- 
2.7.4