platfrom_intel: find OROM based on Intel AHCI and SAS driver device id

We use PCI device id exposed by AHCI and ISCU drivers (SAS controller)
to find OROM version table.
In this way there is no need to maintain AHCI and ISCU device id list
in mdadm. The consequence is that the OROM properties can be found by mdadm when AHCI or
SAS drivers are loaded in the system.

Signed-off-by: Marcin Labun <marcin.labun@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

platform-intel.c

@@ -31,6 +31,9 @@
 #include <limits.h>
 
 
+static int devpath_to_ll(const char *dev_path, const char *entry,
+			 unsigned long long *val);
+
 static __u16 devpath_to_vendor(const char *dev_path);
 
 void free_sys_dev(struct sys_dev **list)
@@ -56,6 +59,7 @@ struct sys_dev *find_driver_devices(const char *bus, const char *driver)
 	struct sys_dev *head = NULL;
 	struct sys_dev *list = NULL;
 	enum sys_dev_type type;
+	unsigned long long dev_id;
 
 	if (strcmp(driver, "isci") == 0)
 		type = SYS_DEV_SAS;
@@ -93,6 +97,9 @@ struct sys_dev *find_driver_devices(const char *bus, const char *driver)
 		if (devpath_to_vendor(path) != 0x8086)
 			continue;
 
+		if (devpath_to_ll(path, "device", &dev_id) != 0)
+			continue;
+
 		/* start / add list entry */
 		if (!head) {
 			head = malloc(sizeof(*head));
@@ -107,6 +114,7 @@ struct sys_dev *find_driver_devices(const char *bus, const char *driver)
 			break;
 		}
 
+		list->dev_id = (__u16) dev_id;
 		list->type = type;
 		list->path = canonicalize_file_name(path);
 		list->next = NULL;
@@ -118,6 +126,35 @@ struct sys_dev *find_driver_devices(const char *bus, const char *driver)
 }
 
 
+static struct sys_dev *intel_devices=NULL;
+
+static enum sys_dev_type device_type_by_id(__u16 device_id)
+{
+	struct sys_dev *iter;
+
+	for(iter = intel_devices; iter != NULL; iter = iter->next)
+		if (iter->dev_id == device_id)
+			return iter->type;
+	return SYS_DEV_UNKNOWN;
+}
+
+static int devpath_to_ll(const char *dev_path, const char *entry, unsigned long long *val)
+{
+	char path[strlen(dev_path) + strlen(entry) + 2];
+	int fd;
+	int n;
+
+	sprintf(path, "%s/%s", dev_path, entry);
+
+	fd = open(path, O_RDONLY);
+	if (fd < 0)
+		return -1;
+	n = sysfs_fd_get_ll(fd, val);
+	close(fd);
+	return n;
+}
+
+
 static __u16 devpath_to_vendor(const char *dev_path)
 {
 	char path[strlen(dev_path) + strlen("/vendor") + 1];
@@ -160,17 +197,6 @@ struct sys_dev *find_intel_devices(void)
 	return ahci;
 }
 
-static int platform_has_intel_devices(void)
-{
-	struct sys_dev *devices;
-	devices = find_intel_devices();
-	if (devices) {
-		free_sys_dev(&devices);
-		return 1;
-	}
-	return 0;
-}
-
 /*
  * PCI Expansion ROM Data Structure Format */
 struct pciExpDataStructFormat {
@@ -190,16 +216,21 @@ static int scan(const void *start, const void *end, const void *data)
 	int len = (end - start);
 	struct pciExpDataStructFormat *ptr= (struct pciExpDataStructFormat *)data;
 
+	if (data + 0x18 > end) {
+		dprintf("cannot find pciExpDataStruct \n");
+		return 0;
+	}
+
 	dprintf("ptr->vendorID: %lx __le16_to_cpu(ptr->deviceID): %lx \n",
 		(ulong) __le16_to_cpu(ptr->vendorID),
 		(ulong) __le16_to_cpu(ptr->deviceID));
 
-	if ((__le16_to_cpu(ptr->vendorID) == 0x8086) &&
-	    (__le16_to_cpu(ptr->deviceID) == 0x2822))
-		dev = SYS_DEV_SATA;
-	else if ((__le16_to_cpu(ptr->vendorID) == 0x8086) &&
-		 (__le16_to_cpu(ptr->deviceID) == 0x1D60))
-		dev = SYS_DEV_SAS;
+	if (__le16_to_cpu(ptr->vendorID) == 0x8086) {
+		/* serach  attached intel devices by device id from OROM */
+		dev = device_type_by_id(__le16_to_cpu(ptr->deviceID));
+		if (dev == SYS_DEV_UNKNOWN)
+			return 0;
+	}
 	else
 		return 0;
 
@@ -275,7 +306,13 @@ static const struct imsm_orom *find_imsm_hba_orom(enum sys_dev_type hba_id)
 	    check_env("IMSM_TEST_SCU_EFI"))
 		return NULL;
 
-	if (!platform_has_intel_devices())
+
+	if (intel_devices != NULL)
+		free_sys_dev(&intel_devices);
+
+	intel_devices = find_intel_devices();
+
+	if (intel_devices == NULL)
 		return NULL;
 
 	/* scan option-rom memory looking for an imsm signature */
@@ -286,10 +323,14 @@ static const struct imsm_orom *find_imsm_hba_orom(enum sys_dev_type hba_id)
 	if (probe_roms_init(align) != 0)
 		return NULL;
 	probe_roms();
-	/* ignore result - True is returned if both are found */
+	/* ignore return value - True is returned if both adapater roms are found */
 	scan_adapter_roms(scan);
 	probe_roms_exit();
 
+	if (intel_devices != NULL)
+		free_sys_dev(&intel_devices);
+	intel_devices = NULL;
+
 	if (populated_orom[hba_id])
 		return &imsm_orom[hba_id];
 	return NULL;

platform-intel.h

@@ -194,6 +194,7 @@ struct sys_dev {
 	enum sys_dev_type type;
 	char *path;
 	char *pci_id;
+	__u16  dev_id;
 	struct sys_dev *next;
 };