3 files changed, 68 insertions, 5 deletions

diff --git a/drivers/scsi/isci/init.c b/drivers/scsi/isci/init.c
index 65519321e1cc..13105294fbea 100644
--- a/drivers/scsi/isci/init.c
+++ b/drivers/scsi/isci/init.c
@@ -474,10 +474,9 @@ static int __devinit isci_pci_probe(struct pci_dev *pdev, const struct pci_devic
 		return -ENOMEM;
 	pci_set_drvdata(pdev, pci_info);
 
-	if (efi_enabled) {
-		/* do EFI parsing here */
-		orom = NULL;
-	} else
+	if (efi_enabled)
+		orom = isci_get_efi_var(pdev);
+	else
 		orom = isci_request_oprom(pdev);
 
 	if (!orom) {
diff --git a/drivers/scsi/isci/probe_roms.c b/drivers/scsi/isci/probe_roms.c
index 0b90e7c546c0..927feaddc04d 100644
--- a/drivers/scsi/isci/probe_roms.c
+++ b/drivers/scsi/isci/probe_roms.c
@@ -27,6 +27,7 @@
 #include <linux/kernel.h>
 #include <linux/firmware.h>
 #include <linux/uaccess.h>
+#include <linux/efi.h>
 #include <asm/probe_roms.h>
 
 #include "isci.h"
@@ -36,6 +37,15 @@
 #include "sci_environment.h"
 #include "probe_roms.h"
 
+struct efi_variable {
+	efi_char16_t  VariableName[1024/sizeof(efi_char16_t)];
+	efi_guid_t    VendorGuid;
+	unsigned long DataSize;
+	__u8          Data[1024];
+	efi_status_t  Status;
+	__u32         Attributes;
+} __attribute__((packed));
+
 struct isci_orom *isci_request_oprom(struct pci_dev *pdev)
 {
 	void __iomem *oprom = pci_map_biosrom(pdev);
@@ -131,3 +141,57 @@ struct isci_orom *isci_request_firmware(struct pci_dev *pdev, const struct firmw
 
 	return orom;
 }
+
+static struct efi *get_efi(void)
+{
+	#ifdef CONFIG_EFI
+	return &efi;
+	#else
+	return NULL;
+	#endif
+}
+
+struct isci_orom *isci_get_efi_var(struct pci_dev *pdev)
+{
+	struct efi_variable *evar;
+	efi_status_t status;
+	struct isci_orom *orom = NULL;
+
+	evar = devm_kzalloc(&pdev->dev,
+			    sizeof(struct efi_variable),
+			    GFP_KERNEL);
+	if (!evar) {
+		dev_warn(&pdev->dev,
+			 "Unable to allocate memory for EFI var\n");
+		return NULL;
+	}
+
+	evar->DataSize = 1024;
+	evar->VendorGuid = ISCI_EFI_VENDOR_GUID;
+	evar->Attributes = ISCI_EFI_ATTRIBUTES;
+
+	if (get_efi())
+		status = get_efi()->get_variable(evar->VariableName,
+						 &evar->VendorGuid,
+						 &evar->Attributes,
+						 &evar->DataSize,
+						 evar->Data);
+	else
+		status = EFI_NOT_FOUND;
+
+	if (status == EFI_SUCCESS)
+		orom = (struct isci_orom *)evar->Data;
+	else
+		dev_warn(&pdev->dev,
+			 "Unable to obtain EFI variable for OEM parms\n");
+
+	if (orom && memcmp(orom->hdr.signature, ISCI_ROM_SIG,
+			   strlen(ISCI_ROM_SIG)) != 0)
+		dev_warn(&pdev->dev,
+			 "Verifying OROM signature failed\n");
+
+	if (!orom)
+		devm_kfree(&pdev->dev, evar);
+
+	return orom;
+}
diff --git a/drivers/scsi/isci/probe_roms.h b/drivers/scsi/isci/probe_roms.h
index 76651c01895a..96d8b9212457 100644
--- a/drivers/scsi/isci/probe_roms.h
+++ b/drivers/scsi/isci/probe_roms.h
@@ -69,7 +69,7 @@ enum sci_status isci_parse_oem_parameters(
 	struct isci_orom *orom,
 	int scu_index);
 struct isci_orom *isci_request_firmware(struct pci_dev *pdev, const struct firmware *fw);
-int isci_get_efi_var(struct pci_dev *pdev);
+struct isci_orom *isci_get_efi_var(struct pci_dev *pdev);
 #else
 #define SCI_MAX_PORTS 4
 #define SCI_MAX_PHYS 4