efivar/SOURCES/0015-Make-a-linux-device-root-for-SOC-devices-that-use-FD.patch
2021-10-08 10:47:49 +00:00

132 lines
4.2 KiB
Diff

From d8637ea2b540fc9d16f1d1c1312e49a24082eefe Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Wed, 20 Jun 2018 16:16:35 -0400
Subject: [PATCH 15/39] Make a linux device root for SOC devices that use FDT.
Add parsing for FDT devices in sysfs. These devices have to use HD() or
File() because we don't have a way to express FDT nodes in a Device
Path.
Signed-off-by: Peter Jones <pjones@redhat.com>
---
src/linux-soc-root.c | 72 ++++++++++++++++++++++++++++++++++++++++++++
src/linux.c | 1 +
src/linux.h | 3 +-
3 files changed, 75 insertions(+), 1 deletion(-)
create mode 100644 src/linux-soc-root.c
diff --git a/src/linux-soc-root.c b/src/linux-soc-root.c
new file mode 100644
index 00000000000..57dd9b04f2c
--- /dev/null
+++ b/src/linux-soc-root.c
@@ -0,0 +1,72 @@
+/*
+ * libefiboot - library for the manipulation of EFI boot variables
+ * Copyright 2012-2018 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of the
+ * License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "fix_coverity.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <unistd.h>
+
+#include "efiboot.h"
+
+/*
+ * support for soc platforms
+ *
+ * various devices /sys/dev/block/$major:$minor start with:
+ * maj:min -> ../../devices/platform/soc/$DEVICETREE_NODE/$BLOCKDEV_STUFF/block/$DISK/$PART
+ * i.e.: soc/1a400000.sata/ata1/host0/target0:0:0/0:0:0:0/block/sda/sda1
+ * ^ dt node ^ blockdev stuff ^ disk
+ * I don't *think* the devicetree nodes stack.
+ */
+static ssize_t
+parse_soc_root(struct device *dev UNUSED, const char *current, const char *root UNUSED)
+{
+ int rc;
+ int pos;
+ const char *devpart = current;
+ char *spaces;
+
+ pos = strlen(current);
+ spaces = alloca(pos+1);
+ memset(spaces, ' ', pos+1);
+ spaces[pos] = '\0';
+ pos = 0;
+
+ debug(DEBUG, "entry");
+
+ rc = sscanf(devpart, "../../devices/platform/soc/%*[^/]/%n", &pos);
+ if (rc != 0)
+ return 0;
+ devpart += pos;
+ debug(DEBUG, "new position is \"%s\"", devpart);
+
+ return devpart - current;
+}
+
+enum interface_type soc_root_iftypes[] = { soc_root, unknown };
+
+struct dev_probe HIDDEN soc_root_parser = {
+ .name = "soc_root",
+ .iftypes = soc_root_iftypes,
+ .flags = DEV_ABBREV_ONLY|DEV_PROVIDES_ROOT,
+ .parse = parse_soc_root,
+};
diff --git a/src/linux.c b/src/linux.c
index 83adc510944..1e7db4e3f61 100644
--- a/src/linux.c
+++ b/src/linux.c
@@ -237,6 +237,7 @@ static struct dev_probe *dev_probes[] = {
&pmem_parser,
&acpi_root_parser,
&pci_root_parser,
+ &soc_root_parser,
&pci_parser,
&virtblk_parser,
&sas_parser,
diff --git a/src/linux.h b/src/linux.h
index ef7dba769bd..99d61013e02 100644
--- a/src/linux.h
+++ b/src/linux.h
@@ -95,7 +95,7 @@ struct nvdimm_info {
enum interface_type {
unknown,
- isa, acpi_root, pci_root, pci, network,
+ isa, acpi_root, pci_root, soc_root, pci, network,
ata, atapi, scsi, sata, sas,
usb, i1394, fibre, i2o,
md, virtblk,
@@ -268,6 +268,7 @@ extern ssize_t parse_scsi_link(const char *current, uint32_t *host,
extern struct dev_probe pmem_parser;
extern struct dev_probe pci_root_parser;
extern struct dev_probe acpi_root_parser;
+extern struct dev_probe soc_root_parser;
extern struct dev_probe pci_parser;
extern struct dev_probe sas_parser;
extern struct dev_probe sata_parser;
--
2.17.1