isci: Adding EFI variable skeletal support
Adding EFI variable retrieving for OEM parameters. Still need GUID and
variable name.
Also updated the data struct for oem parameters and hex file for firmware
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
[fix CONFIG_EFI=n compile error]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/scsi/isci/probe_roms.c b/drivers/scsi/isci/probe_roms.c
index 0b90e7c..927fead 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 @@
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;
+}