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From:   LeoLiu-oc <LeoLiu-oc@zhaoxin.com>
To:     <rafael@kernel.org>, <lenb@kernel.org>, <james.morse@arm.com>,
        <tony.luck@intel.com>, <bp@alien8.de>, <robert.moore@intel.com>,
        <ying.huang@intel.com>, <rdunlap@infradead.org>,
        <bhelgaas@google.com>, <linux-acpi@vger.kernel.org>,
        <linux-pci@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <devel@acpica.org>
CC:     <CobeChen@zhaoxin.com>, <TonyWWang@zhaoxin.com>,
        <ErosZhang@zhaoxin.com>, leoliu-oc <leoliu-oc@zhaoxin.com>
Subject: [PATCH 1/5] ACPI/APEI: Add apei_hest_parse_aer()
Date:   Thu, 27 Oct 2022 11:15:18 +0800
Message-ID: <20221027031518.2855743-1-LeoLiu-oc@zhaoxin.com>
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From: leoliu-oc <leoliu-oc@zhaoxin.com>

apei_hest_parse_aer() is used to parse and record the PCI Express AER
Structure in the HEST Table.

Signed-off-by: leoliu-oc <leoliu-oc@zhaoxin.com>
---
 drivers/acpi/apei/hest.c | 119 ++++++++++++++++++++++++++++++++++++++-
 include/acpi/actbl1.h    |  69 +++++++++++++++++++++++
 include/acpi/apei.h      |   7 +++
 3 files changed, 194 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
index 6aef1ee5e1bd..0bfdc18758f5 100644
--- a/drivers/acpi/apei/hest.c
+++ b/drivers/acpi/apei/hest.c
@@ -25,6 +25,7 @@
 #include <linux/platform_device.h>
 #include <acpi/apei.h>
 #include <acpi/ghes.h>
+#include <linux/pci.h>
 
 #include "apei-internal.h"
 
@@ -86,7 +87,48 @@ static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
 	return len;
 };
 
-typedef int (*apei_hest_func_t)(struct acpi_hest_header *hest_hdr, void *data);
+static inline bool hest_source_is_pcie_aer(struct acpi_hest_header *hest_hdr)
+{
+	if (hest_hdr->type == ACPI_HEST_TYPE_AER_ROOT_PORT ||
+		hest_hdr->type == ACPI_HEST_TYPE_AER_ENDPOINT ||
+		hest_hdr->type == ACPI_HEST_TYPE_AER_BRIDGE)
+		return true;
+	return false;
+}
+
+static inline bool hest_match_type(struct acpi_hest_header *hest_hdr,
+				struct pci_dev *dev)
+{
+	u16 hest_type = hest_hdr->type;
+	u8 pcie_type = pci_pcie_type(dev);
+
+	if ((hest_type == ACPI_HEST_TYPE_AER_ROOT_PORT &&
+		pcie_type == PCI_EXP_TYPE_ROOT_PORT) ||
+		(hest_type == ACPI_HEST_TYPE_AER_ENDPOINT &&
+		pcie_type == PCI_EXP_TYPE_ENDPOINT) ||
+		(hest_type == ACPI_HEST_TYPE_AER_BRIDGE &&
+		(pcie_type == PCI_EXP_TYPE_PCI_BRIDGE || pcie_type == PCI_EXP_TYPE_PCIE_BRIDGE)))
+		return true;
+	return false;
+}
+
+static inline bool hest_match_pci_devfn(struct acpi_hest_aer_common *p,
+		struct pci_dev *pci)
+{
+	return	ACPI_HEST_SEGMENT(p->bus) == pci_domain_nr(pci->bus) &&
+			ACPI_HEST_BUS(p->bus)     == pci->bus->number &&
+			p->device                 == PCI_SLOT(pci->devfn) &&
+			p->function               == PCI_FUNC(pci->devfn);
+}
+
+static inline bool hest_match_pci(struct acpi_hest_header *hest_hdr,
+		struct acpi_hest_aer_common *p, struct pci_dev *pci)
+{
+	if (hest_match_type(hest_hdr, pci))
+		return(hest_match_pci_devfn(p, pci));
+	else
+		return false;
+}
 
 static int apei_hest_parse(apei_hest_func_t func, void *data)
 {
@@ -124,6 +166,81 @@ static int apei_hest_parse(apei_hest_func_t func, void *data)
 	return 0;
 }
 
+/*
+ * apei_hest_parse_aer - Find the AER structure in the HEST Table and
+ * match it with the PCI device.
+ *
+ * @hest_hdr: To save the acpi aer error source in hest table
+ *
+ * Return 1 if the pci dev matched with the acpi aer error source in
+ * hest table, else return 0.
+ */
+int apei_hest_parse_aer(struct acpi_hest_header *hest_hdr, void *data)
+{
+	struct acpi_hest_parse_aer_info *info = data;
+	struct acpi_hest_aer_endpoint *acpi_hest_aer_endpoint = NULL;
+	struct acpi_hest_aer_root_port *acpi_hest_aer_root_port = NULL;
+	struct acpi_hest_aer_for_bridge *acpi_hest_aer_for_bridge = NULL;
+
+	if (!hest_source_is_pcie_aer(hest_hdr))
+		return 0;
+
+	if (hest_hdr->type == ACPI_HEST_TYPE_AER_ROOT_PORT) {
+		acpi_hest_aer_root_port = (struct acpi_hest_aer_root_port *)(hest_hdr + 1);
+		if (acpi_hest_aer_root_port->flags & ACPI_HEST_GLOBAL) {
+			if (hest_match_type(hest_hdr, info->pci_dev)) {
+				info->acpi_hest_aer_root_port = acpi_hest_aer_root_port;
+				info->hest_matched_with_dev = 1;
+			} else
+				info->hest_matched_with_dev = 0;
+		} else {
+			if (hest_match_pci(hest_hdr,
+					(struct acpi_hest_aer_common *)acpi_hest_aer_root_port,
+					info->pci_dev)) {
+				info->acpi_hest_aer_root_port = acpi_hest_aer_root_port;
+				info->hest_matched_with_dev = 1;
+			} else
+				info->hest_matched_with_dev = 0;
+		}
+	} else if (hest_hdr->type == ACPI_HEST_TYPE_AER_ENDPOINT) {
+		acpi_hest_aer_endpoint = (struct acpi_hest_aer_endpoint *)(hest_hdr + 1);
+		if (acpi_hest_aer_endpoint->flags & ACPI_HEST_GLOBAL) {
+			if (hest_match_type(hest_hdr, info->pci_dev)) {
+				info->acpi_hest_aer_endpoint = acpi_hest_aer_endpoint;
+				info->hest_matched_with_dev = 1;
+			} else
+				info->hest_matched_with_dev = 0;
+		} else {
+			if (hest_match_pci(hest_hdr,
+					(struct acpi_hest_aer_common *)acpi_hest_aer_endpoint,
+					info->pci_dev)) {
+				info->acpi_hest_aer_endpoint = acpi_hest_aer_endpoint;
+				info->hest_matched_with_dev = 1;
+			} else
+				info->hest_matched_with_dev = 0;
+		}
+	} else if (hest_hdr->type == ACPI_HEST_TYPE_AER_BRIDGE) {
+		acpi_hest_aer_for_bridge =
+			(struct acpi_hest_aer_for_bridge *)(hest_hdr + 1);
+		if (acpi_hest_aer_for_bridge->flags & ACPI_HEST_GLOBAL) {
+			if (hest_match_type(hest_hdr, info->pci_dev)) {
+				info->acpi_hest_aer_for_bridge = acpi_hest_aer_for_bridge;
+				info->hest_matched_with_dev = 1;
+			} else
+				info->hest_matched_with_dev = 0;
+		} else {
+			if (hest_match_pci(hest_hdr,
+					(struct acpi_hest_aer_common *)acpi_hest_aer_for_bridge,
+					info->pci_dev)) {
+				info->acpi_hest_aer_for_bridge = acpi_hest_aer_for_bridge;
+				info->hest_matched_with_dev = 1;
+			} else
+				info->hest_matched_with_dev = 0;
+		}
+	}
+	return info->hest_matched_with_dev;
+}
+
 /*
  * Check if firmware advertises firmware first mode. We need FF bit to be set
  * along with a set of MC banks which work in FF mode.
diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
index 15c78678c5d3..7f52035512b2 100644
--- a/include/acpi/actbl1.h
+++ b/include/acpi/actbl1.h
@@ -1385,6 +1385,75 @@ struct acpi_hest_aer_bridge {
 	u32 advanced_capabilities2;
 };
 
+struct acpi_hest_parse_aer_info {
+	struct pci_dev *pci_dev;
+	int hest_matched_with_dev;
+	struct acpi_hest_aer_endpoint *acpi_hest_aer_endpoint;
+	struct acpi_hest_aer_root_port *acpi_hest_aer_root_port;
+	struct acpi_hest_aer_for_bridge *acpi_hest_aer_for_bridge;
+};
+
+/* HEST Sub-structure for PCIE EndPoint Structure (6) */
+
+struct acpi_hest_aer_root_port {
+	u16 reserved1;
+	u8 flags;
+	u8 enabled;
+	u32 records_to_preallocate;
+	u32 max_sections_per_record;
+	u32 bus;		/* Bus and Segment numbers */
+	u16 device;
+	u16 function;
+	u16 device_control;
+	u16 reserved2;
+	u32 uncorrectable_mask;
+	u32 uncorrectable_severity;
+	u32 correctable_mask;
+	u32 advanced_capabilities;
+	u32 root_error_command;
+};
+
+/* HEST Sub-structure for PCIE EndPoint Structure (7) */
+
+struct acpi_hest_aer_endpoint {
+	u16 reserved1;
+	u8 flags;
+	u8 enabled;
+	u32 records_to_preallocate;
+	u32 max_sections_per_record;
+	u32 bus;		/* Bus and Segment numbers */
+	u16 device;
+	u16 function;
+	u16 device_control;
+	u16 reserved2;
+	u32 uncorrectable_mask;
+	u32 uncorrectable_severity;
+	u32 correctable_mask;
+	u32 advanced_capabilities;
+};
+
+/* HEST Sub-structure for PCIE/PCI Bridge Structure (8) */
+
+struct acpi_hest_aer_for_bridge {
+	u16 reserved1;
+	u8 flags;
+	u8 enabled;
+	u32 records_to_preallocate;
+	u32 max_sections_per_record;
+	u32 bus;
+	u16 device;
+	u16 function;
+	u16 device_control;
+	u16 reserved2;
+	u32 uncorrectable_mask;
+	u32 uncorrectable_severity;
+	u32 correctable_mask;
+	u32 advanced_capabilities;
+	u32 uncorrectable_mask2;
+	u32 uncorrectable_severity2;
+	u32 advanced_capabilities2;
+};
+
 /* 9: Generic Hardware Error Source */
 
 struct acpi_hest_generic {
diff --git a/include/acpi/apei.h b/include/acpi/apei.h
index dc60f7db5524..8a0b2b9edbaf 100644
--- a/include/acpi/apei.h
+++ b/include/acpi/apei.h
@@ -33,10 +33,17 @@ void __init acpi_ghes_init(void);
 static inline void acpi_ghes_init(void) { }
 #endif
 
+typedef int (*apei_hest_func_t)(struct acpi_hest_header *hest_hdr, void *data);
+
 #ifdef CONFIG_ACPI_APEI
 void __init acpi_hest_init(void);
+int apei_hest_parse_aer(struct acpi_hest_header *hest_hdr, void *data);
 #else
 static inline void acpi_hest_init(void) { }
+static inline int apei_hest_parse_aer(struct acpi_hest_header *hest_hdr, void *data)
+{
+	return -EINVAL;
+}
 #endif
 
 int erst_write(const struct cper_record_header *record);
-- 
2.20.1