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[3/4] fpga: dfl: add dfl bus support to MODULE_DEVICE_TABLE()

Message ID 20201103072104.12361-4-mdf@kernel.org (mailing list archive)
State Superseded, archived
Headers show
Series DFL Module support | expand

Commit Message

Moritz Fischer Nov. 3, 2020, 7:21 a.m. UTC
From: Xu Yilun <yilun.xu@intel.com>

Device Feature List (DFL) is a linked list of feature headers within the
device MMIO space. It is used by FPGA to enumerate multiple sub features
within it. Each feature can be uniquely identified by DFL type and
feature id, which can be read out from feature headers.

A dfl bus helps DFL framework modularize DFL device drivers for
different sub features. The dfl bus matches its devices and drivers by
DFL type and feature id.

This patch adds dfl bus support to MODULE_DEVICE_TABLE() by adding info
about struct dfl_device_id in devicetable-offsets.c and add a dfl entry
point in file2alias.c.

Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Acked-by: Wu Hao <hao.wu@intel.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
 scripts/mod/devicetable-offsets.c |  4 ++++
 scripts/mod/file2alias.c          | 13 +++++++++++++
 2 files changed, 17 insertions(+)
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diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
index 27007c18e754..d8350eea6d1a 100644
--- a/scripts/mod/devicetable-offsets.c
+++ b/scripts/mod/devicetable-offsets.c
@@ -243,5 +243,9 @@  int main(void)
 	DEVID_FIELD(mhi_device_id, chan);
+	DEVID(dfl_device_id);
+	DEVID_FIELD(dfl_device_id, type);
+	DEVID_FIELD(dfl_device_id, feature_id);
 	return 0;
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index 2417dd1dee33..8a438c94dcd9 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -1368,6 +1368,18 @@  static int do_mhi_entry(const char *filename, void *symval, char *alias)
 	return 1;
+/* Looks like: dfl:tNfN */
+static int do_dfl_entry(const char *filename, void *symval, char *alias)
+	DEF_FIELD(symval, dfl_device_id, type);
+	DEF_FIELD(symval, dfl_device_id, feature_id);
+	sprintf(alias, "dfl:t%04Xf%04X", type, feature_id);
+	add_wildcard(alias);
+	return 1;
 /* Does namelen bytes of name exactly match the symbol? */
 static bool sym_is(const char *name, unsigned namelen, const char *symbol)
@@ -1442,6 +1454,7 @@  static const struct devtable devtable[] = {
 	{"tee", SIZE_tee_client_device_id, do_tee_entry},
 	{"wmi", SIZE_wmi_device_id, do_wmi_entry},
 	{"mhi", SIZE_mhi_device_id, do_mhi_entry},
+	{"dfl", SIZE_dfl_device_id, do_dfl_entry},
 /* Create MODULE_ALIAS() statements.