imsm: add read OROM form ACPI UEFI tables

OROM - IMSM hardware capabilities

EFI vars depends on userspace, they need to be mounted to be accessible.
Sporadic problems have been observed with availability at an early
assemble stage. It is not possible to fully synchronize EFI vars mounts
with udev rules processing.

For the reason above, read of IMSM OROM from ACPI tables as secondary
option is added. This method will be used for SATA and VMD family
controllers.

ACPI tables are generated by sysfs, earlier in the boot process, before
the stage of RAID assembly. The way of loading OROM via EFI vars is
retained, ACPI tables will be a backup way.

Two paths will be maintained, because IMSM hardware capabilities are
necessary for RAID assembly during booting, so access to them must be
provided.

Signed-off-by: Blazej Kucman <blazej.kucman@intel.com>

1 files changed, 299 insertions, 25 deletions

diff --git a/platform-intel.c b/platform-intel.c
index d6a53533..9705c925 100644
--- a/platform-intel.c
+++ b/platform-intel.c
@@ -577,6 +577,9 @@ static const struct imsm_orom *find_imsm_hba_orom(struct sys_dev *hba)
 
 #define SYS_EFI_VAR_PATH "/sys/firmware/efi/vars"
 #define SYS_EFIVARS_PATH "/sys/firmware/efi/efivars"
+#define ACPI_TABLES_PATH "/sys/firmware/acpi/tables/"
+#define ACPI_UEFI_TABLE_BASE_NAME "UEFI"
+#define ACPI_UEFI_DATA_OFFSET 52
 #define SCU_PROP "RstScuV"
 #define AHCI_PROP "RstSataV"
 #define AHCI_SSATA_PROP "RstsSatV"
@@ -584,10 +587,73 @@ static const struct imsm_orom *find_imsm_hba_orom(struct sys_dev *hba)
 #define VROC_VMD_PROP "RstUefiV"
 #define RST_VMD_PROP "RstVmdV"
 
-#define VENDOR_GUID \
+#define PCI_CLASS_RAID_CNTRL 0x010400
+
+/* GUID length in Bytes */
+#define GUID_LENGTH 16
+
+/* GUID entry in 'UEFI' for Sata controller. */
+#define RST_SATA_V_GUID \
+	EFI_GUID(0xe4dd92e0, 0xac7d, 0x11df, 0x94, 0xe2, 0x08, 0x00, 0x20, 0x0c, 0x9a, 0x66)
+
+/* GUID entry in 'UEFI' for sSata controller. */
+#define RST_SSATA_V_GUID \
+	EFI_GUID(0xb002be42, 0x901d, 0x4018, 0xb4, 0x1e, 0xd7, 0x04, 0xab, 0x3a, 0x0f, 0x15)
+
+/* GUID entry in 'UEFI' for tSata controller. */
+#define RST_TSATA_V_GUID \
+	EFI_GUID(0x101ce8f1, 0xb873, 0x4362, 0xa9, 0x76, 0xb5, 0x54, 0x31, 0x74, 0x52, 0x7e)
+
+/* GUID entry in 'UEFI' for Intel(R) VROC VMD. */
+#define RST_UEFI_V_GUID \
+	EFI_GUID(0x4bf2da96, 0xde6e, 0x4d8a, 0xa8, 0x8b, 0xb3, 0xd, 0x33, 0xf6, 0xf, 0x3e)
+
+/**
+ * GUID entry in 'UEFI' for Intel(R) RST VMD.
+ * Currently is the same like in 'UEFI' for Sata controller.
+ */
+#define RST_VMD_V_GUID RST_SATA_V_GUID
+
+/* GUID of intel RST vendor EFI var. */
+#define INTEL_RST_VENDOR_GUID \
 	EFI_GUID(0x193dfefa, 0xa445, 0x4302, 0x99, 0xd8, 0xef, 0x3a, 0xad, 0x1a, 0x04, 0xc6)
 
-#define PCI_CLASS_RAID_CNTRL 0x010400
+/*
+ * Unified Extensible Firmware Interface (UEFI) Specification Release 2.10
+ * UEFI ACPI DATA TABLE, Table O.1
+ */
+typedef struct uefi_acpi_table {
+	char signature[4];
+	__u32 length;
+	__u8 revision;
+	__u8 checksum;
+	char oemid[6];
+	/* controller name */
+	char oem_table_id[8];
+	__u32 oem_revision;
+	__u32 creator_id;
+	__u32 creator_revision;
+	/* controller GUID */
+	struct efi_guid identifier;
+	/* OROM data offeset */
+	__u16 dataOffset;
+} uefi_acpi_table_t;
+
+typedef struct uefi_acpi_table_with_orom {
+	struct uefi_acpi_table table;
+	struct imsm_orom orom;
+} uefi_acpi_table_with_orom_t;
+
+/* imsm_orom_id - Identifier used to match imsm efi var or acpi table
+ * @name: name of the UEFI property, it is part of efivar name or ACPI table oem_table_id
+ * @guid: acpi table guid identifier
+ *
+ * vendor guid (second part of evifar name) is not added here because it is cost.
+ */
+typedef struct imsm_orom_id {
+	char *name;
+	struct efi_guid guid;
+} imsm_orom_id_t;
 
 static int read_efi_var(void *buffer, ssize_t buf_size,
 			const char *variable_name, struct efi_guid guid)
@@ -669,14 +735,238 @@ static int read_efi_variable(void *buffer, ssize_t buf_size,
 	return 0;
 }
 
+/**
+ * is_efi_guid_equal() - check if EFI guids are equal.
+ * @guid: EFI guid.
+ * @guid1: EFI guid to compare.
+ *
+ * Return: %true if guid are equal, %false otherwise.
+ */
+static inline bool is_efi_guid_equal(struct efi_guid guid, struct efi_guid guid1)
+{
+	if (memcmp(guid.b, guid1.b, GUID_LENGTH) == 0)
+		return true;
+	return false;
+}
+
+/**
+ * acpi_any_imsm_orom_id_matching() - match ACPI table with any of given imsm_orom_id.
+ * @imsm_orom_ids: array of IMSM OROM Identifiers.
+ * @imsm_orom_ids_number: number of IMSM OROM Identifiers.
+ * @table: struct with read ACPI UEFI table.
+ *
+ * Check if read UEFI table contains requested OROM id.
+ * EFI GUID and controller name are compared with expected.
+ *
+ * Return: %true if length is proper table, %false otherwise.
+ */
+bool acpi_any_imsm_orom_id_matching(imsm_orom_id_t *imsm_orom_ids, int imsm_orom_ids_number,
+				    struct uefi_acpi_table table)
+{
+	int index;
+
+	for (index = 0; index < imsm_orom_ids_number; index++)
+		if (strncmp(table.oem_table_id, imsm_orom_ids[index].name,
+			    strlen(imsm_orom_ids[index].name)) == 0 &&
+		    is_efi_guid_equal(table.identifier,
+				      imsm_orom_ids[index].guid) == true)
+			return true;
+	return false;
+}
+
+/**
+ * read_uefi_acpi_orom_data() - read OROM data from UEFI ACPI table.
+ * @fd: file descriptor.
+ * @uefi_table: struct to fill out.
+ *
+ * Read OROM from ACPI UEFI table under given file descriptor.
+ * Table must have the appropriate OROM data, which should be confirmed before call this function.
+ * In case of success, &orom in structure in &uefi_table will be filled..
+ *
+ * Return: %MDADM_STATUS_SUCCESS on success, %MDADM_STATUS_ERROR otherwise.
+ */
+mdadm_status_t
+read_uefi_acpi_orom_data(int fd, uefi_acpi_table_with_orom_t *uefi_table)
+{
+	assert(is_fd_valid(fd));
+
+	if (lseek(fd, uefi_table->table.dataOffset, 0) == -1L)
+		return MDADM_STATUS_ERROR;
+
+	if (read(fd, &uefi_table->orom, sizeof(uefi_table->orom)) == -1)
+		return MDADM_STATUS_ERROR;
+
+	return MDADM_STATUS_SUCCESS;
+}
+
+/**
+ * verify_uefi_acpi_table_length() - verify if ACPI UEFI table have correct length with focus at
+ * OROM.
+ * @table: struct with UEFI table.
+ *
+ * Verify if ACPI UEFI table have correct length with focus at OROM. Make sure that the file is
+ * correct and contains the appropriate length data based on the length of the OROM.
+ *
+ * Return: %true if length is correct, %false otherwise.
+ */
+bool verify_uefi_acpi_table_length(struct uefi_acpi_table table)
+{
+	if (table.length < ACPI_UEFI_DATA_OFFSET)
+		return false;
+
+	if (table.length - table.dataOffset != sizeof(struct imsm_orom))
+		return false;
+	return true;
+}
+
+/**
+ * find_orom_in_acpi_uefi_tables() - find OROM in UEFI ACPI tables based on requested OROM ids.
+ * @imsm_orom_ids: array of IMSM OROM Identifiers.
+ * @imsm_orom_ids_number: number of IMSM OROM Identifiers.
+ * @orom: OROM struct buffer to fill out.
+ *
+ * Find OROM in UEFI ACPI tables provided by Intel, based on requested controllers.
+ * The first one to be matched, will be used.
+ * If found, the buffer with the OROM structure will be filled.
+ *
+ * Return: %MDADM_STATUS_SUCCESS on success, %MDADM_STATUS_ERROR otherwise.
+ */
+mdadm_status_t
+find_orom_in_acpi_uefi_tables(imsm_orom_id_t *imsm_orom_ids, int imsm_orom_ids_number,
+			      struct imsm_orom *orom)
+{
+	mdadm_status_t status = MDADM_STATUS_ERROR;
+	uefi_acpi_table_with_orom_t uefi_table;
+	char path[PATH_MAX];
+	struct dirent *ent;
+	int fd = -1;
+	DIR *dir;
+
+	dir = opendir(ACPI_TABLES_PATH);
+	if (!dir)
+		return MDADM_STATUS_ERROR;
+
+	for (ent = readdir(dir); ent; ent = readdir(dir)) {
+		close_fd(&fd);
+
+		/* Check if file is a UEFI table */
+		if (strncmp(ent->d_name, ACPI_UEFI_TABLE_BASE_NAME,
+			    strlen(ACPI_UEFI_TABLE_BASE_NAME)) != 0)
+			continue;
+
+		snprintf(path, PATH_MAX, "%s/%s", ACPI_TABLES_PATH, ent->d_name);
+
+		fd = open(path, O_RDONLY);
+		if (!is_fd_valid(fd)) {
+			pr_err("Fail to open ACPI UEFI table file. File: %s, Error: %s\n",
+			       ent->d_name, strerror(errno));
+			continue;
+		}
+
+		if (read(fd, &uefi_table.table, sizeof(struct uefi_acpi_table)) == -1) {
+			pr_err("Fail to read IMSM OROM from ACPI UEFI table file. File: %s\n",
+			       ent->d_name);
+			continue;
+		}
+
+		if (!acpi_any_imsm_orom_id_matching(imsm_orom_ids, imsm_orom_ids_number,
+						    uefi_table.table))
+			continue;
+
+		if (!verify_uefi_acpi_table_length(uefi_table.table))
+			continue;
+
+		if (read_uefi_acpi_orom_data(fd, &uefi_table)) {
+			pr_err("Fail to read IMSM OROM from ACPI UEFI table file. File: %s\n",
+			       ent->d_name);
+			continue;
+		}
+
+		memcpy(orom, &uefi_table.orom, sizeof(uefi_table.orom));
+		status = MDADM_STATUS_SUCCESS;
+		break;
+	}
+
+	close_fd(&fd);
+	closedir(dir);
+	return status;
+}
+
+/**
+ * find_orom_in_efi_variables() - find first IMSM OROM in EFI vars that matches any imsm_orom_id.
+ * @imsm_orom_ids: array of IMSM OROM Identifiers.
+ * @imsm_orom_ids_number: number of IMSM OROM Identifiers.
+ * @orom: OROM struct buffer to fill out.
+ *
+ * Find IMSM OROM that matches on of imsm_orom_id in EFI variables. The first match is used.
+ * If found, the buffer with the OROM structure is filled.
+ *
+ * Return: %MDADM_STATUS_SUCCESS on success, %MDADM_STATUS_ERROR otherwise.
+ */
+mdadm_status_t
+find_orom_in_efi_variables(imsm_orom_id_t *imsm_orom_ids, int imsm_orom_ids_number,
+			   struct imsm_orom *orom)
+{
+	int index;
+
+	for (index = 0; index < imsm_orom_ids_number; index++)
+		if (!read_efi_variable(orom, sizeof(struct imsm_orom), imsm_orom_ids[index].name,
+				       INTEL_RST_VENDOR_GUID))
+			return MDADM_STATUS_SUCCESS;
+	return MDADM_STATUS_ERROR;
+}
+
+/**
+ * find_imsm_efi_orom() - find OROM for requested controller.
+ * @orom: buffer for OROM.
+ * @controller_type: requested controller type.
+ *
+ * Based on controller type, function first search in EFI vars then in ACPI UEFI tables.
+ * For each controller there is defined an array of OROM ids from which we can read OROM,
+ * the first one to be matched, will be used.
+ * In case of success, the structure &orom will be filed out.
+ *
+ * Return: %MDADM_STATUS_SUCCESS on success.
+ */
+static mdadm_status_t
+find_imsm_efi_orom(struct imsm_orom *orom, enum sys_dev_type controller_type)
+{
+	static imsm_orom_id_t sata_imsm_orrom_ids[] = {
+		{AHCI_PROP, RST_SATA_V_GUID},
+		{AHCI_SSATA_PROP, RST_SSATA_V_GUID},
+		{AHCI_TSATA_PROP, RST_TSATA_V_GUID},
+	};
+	static imsm_orom_id_t vmd_imsm_orom_ids[] = {
+		{VROC_VMD_PROP, RST_UEFI_V_GUID},
+		{RST_VMD_PROP, RST_VMD_V_GUID},
+	};
+	static imsm_orom_id_t *imsm_orom_ids;
+	int imsm_orom_ids_number;
+
+	switch (controller_type) {
+	case SYS_DEV_SATA:
+		imsm_orom_ids = sata_imsm_orrom_ids;
+		imsm_orom_ids_number = ARRAY_SIZE(sata_imsm_orrom_ids);
+		break;
+	case SYS_DEV_VMD:
+	case SYS_DEV_SATA_VMD:
+		imsm_orom_ids = vmd_imsm_orom_ids;
+		imsm_orom_ids_number = ARRAY_SIZE(vmd_imsm_orom_ids);
+		break;
+	default:
+		return MDADM_STATUS_UNDEF;
+	}
+
+	if (!find_orom_in_efi_variables(imsm_orom_ids, imsm_orom_ids_number, orom))
+		return MDADM_STATUS_SUCCESS;
+
+	return find_orom_in_acpi_uefi_tables(imsm_orom_ids, imsm_orom_ids_number, orom);
+}
+
 const struct imsm_orom *find_imsm_efi(struct sys_dev *hba)
 {
 	struct imsm_orom orom;
 	struct orom_entry *ret;
-	static const char * const sata_efivars[] = {AHCI_PROP, AHCI_SSATA_PROP,
-						    AHCI_TSATA_PROP};
-	static const char * const vmd_efivars[] = {VROC_VMD_PROP, RST_VMD_PROP};
-	unsigned long i;
 
 	if (check_env("IMSM_TEST_AHCI_EFI") || check_env("IMSM_TEST_SCU_EFI"))
 		return imsm_platform_test(hba);
@@ -687,36 +977,20 @@ const struct imsm_orom *find_imsm_efi(struct sys_dev *hba)
 
 	switch (hba->type) {
 	case SYS_DEV_SAS:
-		if (!read_efi_variable(&orom, sizeof(orom), SCU_PROP,
-				       VENDOR_GUID))
+		if (!read_efi_variable(&orom, sizeof(orom), SCU_PROP, INTEL_RST_VENDOR_GUID))
 			break;
-
 		return NULL;
 	case SYS_DEV_SATA:
 		if (hba->class != PCI_CLASS_RAID_CNTRL)
 			return NULL;
 
-		for (i = 0; i < ARRAY_SIZE(sata_efivars); i++) {
-			if (!read_efi_variable(&orom, sizeof(orom),
-						sata_efivars[i], VENDOR_GUID))
-				break;
-
-		}
-		if (i == ARRAY_SIZE(sata_efivars))
+		if (find_imsm_efi_orom(&orom, hba->type))
 			return NULL;
-
 		break;
 	case SYS_DEV_VMD:
 	case SYS_DEV_SATA_VMD:
-		for (i = 0; i < ARRAY_SIZE(vmd_efivars); i++) {
-			if (!read_efi_variable(&orom, sizeof(orom),
-						vmd_efivars[i], VENDOR_GUID))
-				break;
-		}
-
-		if (i == ARRAY_SIZE(vmd_efivars))
+		if (find_imsm_efi_orom(&orom, hba->type))
 			return NULL;
-
 		break;
 	default:
 		return NULL;