From 5fee6567ec387088ec965ee60c63051bbe102cac Mon Sep 17 00:00:00 2001
From: Dave Jiang <dave.jiang@intel.com>
Date: Thu, 15 Jul 2021 11:44:18 -0700
Subject: [PATCH] dmaengine: idxd: add type to driver in order to allow device matching
Git-commit: 5fee6567ec387088ec965ee60c63051bbe102cac
Patch-mainline: v5.15-rc1
References: jsc#SLE-18899

Add an array of support device types to the idxd_device_driver
definition in order to enable simple matching of device type to a
given driver. The deprecated / omnibus dsa_drv driver specifies
IDXD_DEV_NONE as its only role is to service legacy userspace (old
accel-config) directed bind requests and route them to them the proper
driver. It need not attach to a device when the bus is autoprobed. The
accel-config tooling is being updated to drop its dependency on this
deprecated bind scheme.

Reviewed-by: Dan Willliams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162637465882.744545.17456174666211577867.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/dma/idxd/idxd.h  |  1 +
 drivers/dma/idxd/init.c  |  5 +++++
 drivers/dma/idxd/sysfs.c | 16 +++++++++++++++-
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
index 7fc26b7727c0..4bb5a65ec237 100644
--- a/drivers/dma/idxd/idxd.h
+++ b/drivers/dma/idxd/idxd.h
@@ -51,6 +51,7 @@ enum idxd_type {
 
 struct idxd_device_driver {
 	const char *name;
+	enum idxd_dev_type *type;
 	int (*probe)(struct idxd_dev *idxd_dev);
 	void (*remove)(struct idxd_dev *idxd_dev);
 	struct device_driver drv;
diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index 5b628e6c04bf..544ff7137292 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -879,6 +879,11 @@ int __idxd_driver_register(struct idxd_device_driver *idxd_drv, struct module *o
 {
 	struct device_driver *drv = &idxd_drv->drv;
 
+	if (!idxd_drv->type) {
+		pr_debug("driver type not set (%ps)\n", __builtin_return_address(0));
+		return -EINVAL;
+	}
+
 	drv->name = idxd_drv->name;
 	drv->bus = &dsa_bus_type;
 	drv->owner = owner;
diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
index 9f2d06c2aa98..8d48903df131 100644
--- a/drivers/dma/idxd/sysfs.c
+++ b/drivers/dma/idxd/sysfs.c
@@ -19,9 +19,18 @@ static char *idxd_wq_type_names[] = {
 static int idxd_config_bus_match(struct device *dev,
 				 struct device_driver *drv)
 {
+	struct idxd_device_driver *idxd_drv =
+		container_of(drv, struct idxd_device_driver, drv);
 	struct idxd_dev *idxd_dev = confdev_to_idxd_dev(dev);
+	int i = 0;
+
+	while (idxd_drv->type[i] != IDXD_DEV_NONE) {
+		if (idxd_dev->type == idxd_drv->type[i])
+			return 1;
+		i++;
+	}
 
-	return (is_idxd_dev(idxd_dev) || is_idxd_wq_dev(idxd_dev));
+	return 0;
 }
 
 static int idxd_config_bus_probe(struct device *dev)
@@ -79,10 +88,15 @@ static void idxd_dsa_drv_remove(struct idxd_dev *idxd_dev)
 	}
 }
 
+static enum idxd_dev_type dev_types[] = {
+	IDXD_DEV_NONE,
+};
+
 struct idxd_device_driver dsa_drv = {
 	.name = "dsa",
 	.probe = idxd_dsa_drv_probe,
 	.remove = idxd_dsa_drv_remove,
+	.type = dev_types,
 };
 
 /* IDXD engine attributes */
-- 
2.26.2