commit a3ca37efcf3a80c6b0c02ac4d3995fac29b86dd7
author Patrick Wildt <patrick@blueri.se> Thu Oct 03 16:24:17 2019 +0200
committer Heinrich Schuchardt <xypron.glpk@gmx.de> Sun Oct 06 16:02:37 2019 +0200
tree 0f7f380419c76254588551874dd5712d403b10a4
parent ccdff86f280f4a933cbec9786928697a4a18646b

efi: device path for nvme

This allows our EFI API to create a device path node for NVMe
devices.  It adds the necessary device path struct, uses the
nvme namespace accessor to retrieve the id and eui64, and also
provides support for the device path text protocol.

Signed-off-by: Patrick Wildt <patrick@blueri.se>
Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

include/efi_api.h

diff --git a/include/efi_api.h b/include/efi_api.h
index 37e56da..2239617 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -422,6 +422,7 @@
 #  define DEVICE_PATH_SUB_TYPE_MSG_USB		0x05
 #  define DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR	0x0b
 #  define DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS	0x0f
+#  define DEVICE_PATH_SUB_TYPE_MSG_NVME		0x17
 #  define DEVICE_PATH_SUB_TYPE_MSG_SD		0x1a
 #  define DEVICE_PATH_SUB_TYPE_MSG_MMC		0x1d
 
@@ -464,6 +465,12 @@
 	u8 slot_number;
 } __packed;
 
+struct efi_device_path_nvme {
+	struct efi_device_path dp;
+	u32 ns_id;
+	u8 eui64[8];
+} __packed;
+
 #define DEVICE_PATH_TYPE_MEDIA_DEVICE		0x04
 #  define DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH	0x01
 #  define DEVICE_PATH_SUB_TYPE_CDROM_PATH	0x02

lib/efi_loader/efi_device_path.c

diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
index 86297bb..897fc1b 100644
--- a/lib/efi_loader/efi_device_path.c
+++ b/lib/efi_loader/efi_device_path.c
@@ -10,6 +10,7 @@
 #include <dm.h>
 #include <usb.h>
 #include <mmc.h>
+#include <nvme.h>
 #include <efi_loader.h>
 #include <part.h>
 #include <sandboxblockdev.h>
@@ -451,6 +452,11 @@
 			return dp_size(dev->parent) +
 				sizeof(struct efi_device_path_sd_mmc_path);
 #endif
+#if defined(CONFIG_NVME)
+		case UCLASS_NVME:
+			return dp_size(dev->parent) +
+				sizeof(struct efi_device_path_nvme);
+#endif
 #ifdef CONFIG_SANDBOX
 		case UCLASS_ROOT:
 			 /*
@@ -584,6 +590,20 @@
 			return &sddp[1];
 			}
 #endif
+#if defined(CONFIG_NVME)
+		case UCLASS_NVME: {
+			struct efi_device_path_nvme *dp =
+				dp_fill(buf, dev->parent);
+			u32 ns_id;
+
+			dp->dp.type     = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
+			dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_NVME;
+			dp->dp.length   = sizeof(*dp);
+			nvme_get_namespace_id(dev, &ns_id, dp->eui64);
+			memcpy(&dp->ns_id, &ns_id, sizeof(ns_id));
+			return &dp[1];
+			}
+#endif
 		default:
 			debug("%s(%u) %s: unhandled parent class: %s (%u)\n",
 			      __FILE__, __LINE__, __func__,

lib/efi_loader/efi_device_path_to_text.c

diff --git a/lib/efi_loader/efi_device_path_to_text.c b/lib/efi_loader/efi_device_path_to_text.c
index 0f3796b..af1adbb 100644
--- a/lib/efi_loader/efi_device_path_to_text.c
+++ b/lib/efi_loader/efi_device_path_to_text.c
@@ -148,6 +148,21 @@
 
 		break;
 	}
+	case DEVICE_PATH_SUB_TYPE_MSG_NVME: {
+		struct efi_device_path_nvme *ndp =
+			(struct efi_device_path_nvme *)dp;
+		u32 ns_id;
+		int i;
+
+		memcpy(&ns_id, &ndp->ns_id, sizeof(ns_id));
+		s += sprintf(s, "NVMe(0x%x,", ns_id);
+		for (i = 0; i < sizeof(ndp->eui64); ++i)
+			s += sprintf(s, "%s%02x", i ? "-" : "",
+				     ndp->eui64[i]);
+		s += sprintf(s, ")");
+
+		break;
+	}
 	case DEVICE_PATH_SUB_TYPE_MSG_SD:
 	case DEVICE_PATH_SUB_TYPE_MSG_MMC: {
 		const char *typename =