[PATCH v4 2/4] firmware: coreboot: Generate aliases for coreboot modules

From: "Nícolas F. R. A. Prado" <nfraprado@collabora.com>
To: Tzung-Bi Shih <tzungbi@kernel.org>
Cc: "Arnd Bergmann" <arnd@arndb.de>,
	"Brian Norris" <briannorris@chromium.org>,
	"Julius Werner" <jwerner@chromium.org>,
	"Masahiro Yamada" <masahiroy@kernel.org>,
	"Nathan Chancellor" <nathan@kernel.org>,
	"Nicolas Schier" <nicolas@fjasle.eu>,
	"Catalin Marinas" <catalin.marinas@arm.com>,
	"Will Deacon" <will@kernel.org>,
	"AngeloGioacchino Del Regno"
	<angelogioacchino.delregno@collabora.com>,
	"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	kernel@collabora.com, chrome-platform@lists.linux.dev,
	linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	"Nícolas F. R. A. Prado" <nfraprado@collabora.com>
Subject: [PATCH v4 2/4] firmware: coreboot: Generate aliases for coreboot modules
Date: Mon, 12 Feb 2024 09:50:06 -0500	[thread overview]
Message-ID: <20240212-coreboot-mod-defconfig-v4-2-d14172676f6d@collabora.com> (raw)
In-Reply-To: <20240212-coreboot-mod-defconfig-v4-0-d14172676f6d@collabora.com>

Generate aliases for coreboot modules to allow automatic module probing.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
---
 include/linux/mod_devicetable.h   | 10 ++++++++++
 scripts/mod/devicetable-offsets.c |  3 +++
 scripts/mod/file2alias.c          | 10 ++++++++++
 3 files changed, 23 insertions(+)

diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index f458469c5ce5..7a9a07ea451b 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -960,4 +960,14 @@ struct vchiq_device_id {
 	char name[32];
 };
 
+/**
+ * struct coreboot_device_id - Identifies a coreboot table entry
+ * @tag: tag ID
+ * @driver_data: driver specific data
+ */
+struct coreboot_device_id {
+	__u32 tag;
+	kernel_ulong_t driver_data;
+};
+
 #endif /* LINUX_MOD_DEVICETABLE_H */
diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
index e91a3c38143b..518200813d4e 100644
--- a/scripts/mod/devicetable-offsets.c
+++ b/scripts/mod/devicetable-offsets.c
@@ -274,5 +274,8 @@ int main(void)
 	DEVID(vchiq_device_id);
 	DEVID_FIELD(vchiq_device_id, name);
 
+	DEVID(coreboot_device_id);
+	DEVID_FIELD(coreboot_device_id, tag);
+
 	return 0;
 }
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index 4829680a0a6d..5d1c61fa5a55 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -1494,6 +1494,15 @@ static int do_vchiq_entry(const char *filename, void *symval, char *alias)
 	return 1;
 }
 
+/* Looks like: coreboot:tN */
+static int do_coreboot_entry(const char *filename, void *symval, char *alias)
+{
+	DEF_FIELD(symval, coreboot_device_id, tag);
+	sprintf(alias, "coreboot:t%08X", tag);
+
+	return 1;
+}
+
 /* Does namelen bytes of name exactly match the symbol? */
 static bool sym_is(const char *name, unsigned namelen, const char *symbol)
 {
@@ -1575,6 +1584,7 @@ static const struct devtable devtable[] = {
 	{"ishtp", SIZE_ishtp_device_id, do_ishtp_entry},
 	{"cdx", SIZE_cdx_device_id, do_cdx_entry},
 	{"vchiq", SIZE_vchiq_device_id, do_vchiq_entry},
+	{"coreboot", SIZE_coreboot_device_id, do_coreboot_entry},
 };
 
 /* Create MODULE_ALIAS() statements.

-- 
2.43.0


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