dmaengine: idxd: add 'struct idxd_dev' as wrapper for conf_dev

Add a 'struct idxd_dev' that wraps the 'struct device' for idxd conf_dev
that registers with the dsa bus. This is introduced in order to deal with
multiple different types of 'devices' that are registered on the dsa_bus
when the compat driver needs to route them to the correct driver to attach.
The bind() call now can determine the type of device and then do the
appropriate driver matching.

Reviewed-by Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162637460065.744545.584492831446090984.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 59 insertions, 39 deletions

diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index 6403d55c7ff7..f500076882d2 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -200,6 +200,7 @@ static int idxd_setup_wqs(struct idxd_device *idxd)
 {
 	struct device *dev = &idxd->pdev->dev;
 	struct idxd_wq *wq;
+	struct device *conf_dev;
 	int i, rc;
 
 	idxd->wqs = kcalloc_node(idxd->max_wqs, sizeof(struct idxd_wq *),
@@ -214,15 +215,17 @@ static int idxd_setup_wqs(struct idxd_device *idxd)
 			goto err;
 		}
 
+		idxd_dev_set_type(&wq->idxd_dev, IDXD_DEV_WQ);
+		conf_dev = wq_confdev(wq);
 		wq->id = i;
 		wq->idxd = idxd;
-		device_initialize(&wq->conf_dev);
-		wq->conf_dev.parent = &idxd->conf_dev;
-		wq->conf_dev.bus = &dsa_bus_type;
-		wq->conf_dev.type = &idxd_wq_device_type;
-		rc = dev_set_name(&wq->conf_dev, "wq%d.%d", idxd->id, wq->id);
+		device_initialize(wq_confdev(wq));
+		conf_dev->parent = idxd_confdev(idxd);
+		conf_dev->bus = &dsa_bus_type;
+		conf_dev->type = &idxd_wq_device_type;
+		rc = dev_set_name(conf_dev, "wq%d.%d", idxd->id, wq->id);
 		if (rc < 0) {
-			put_device(&wq->conf_dev);
+			put_device(conf_dev);
 			goto err;
 		}
 
@@ -233,7 +236,7 @@ static int idxd_setup_wqs(struct idxd_device *idxd)
 		wq->max_batch_size = idxd->max_batch_size;
 		wq->wqcfg = kzalloc_node(idxd->wqcfg_size, GFP_KERNEL, dev_to_node(dev));
 		if (!wq->wqcfg) {
-			put_device(&wq->conf_dev);
+			put_device(conf_dev);
 			rc = -ENOMEM;
 			goto err;
 		}
@@ -243,8 +246,11 @@ static int idxd_setup_wqs(struct idxd_device *idxd)
 	return 0;
 
  err:
-	while (--i >= 0)
-		put_device(&idxd->wqs[i]->conf_dev);
+	while (--i >= 0) {
+		wq = idxd->wqs[i];
+		conf_dev = wq_confdev(wq);
+		put_device(conf_dev);
+	}
 	return rc;
 }
 
@@ -252,6 +258,7 @@ static int idxd_setup_engines(struct idxd_device *idxd)
 {
 	struct idxd_engine *engine;
 	struct device *dev = &idxd->pdev->dev;
+	struct device *conf_dev;
 	int i, rc;
 
 	idxd->engines = kcalloc_node(idxd->max_engines, sizeof(struct idxd_engine *),
@@ -266,15 +273,17 @@ static int idxd_setup_engines(struct idxd_device *idxd)
 			goto err;
 		}
 
+		idxd_dev_set_type(&engine->idxd_dev, IDXD_DEV_ENGINE);
+		conf_dev = engine_confdev(engine);
 		engine->id = i;
 		engine->idxd = idxd;
-		device_initialize(&engine->conf_dev);
-		engine->conf_dev.parent = &idxd->conf_dev;
-		engine->conf_dev.bus = &dsa_bus_type;
-		engine->conf_dev.type = &idxd_engine_device_type;
-		rc = dev_set_name(&engine->conf_dev, "engine%d.%d", idxd->id, engine->id);
+		device_initialize(conf_dev);
+		conf_dev->parent = idxd_confdev(idxd);
+		conf_dev->bus = &dsa_bus_type;
+		conf_dev->type = &idxd_engine_device_type;
+		rc = dev_set_name(conf_dev, "engine%d.%d", idxd->id, engine->id);
 		if (rc < 0) {
-			put_device(&engine->conf_dev);
+			put_device(conf_dev);
 			goto err;
 		}
 
@@ -284,14 +293,18 @@ static int idxd_setup_engines(struct idxd_device *idxd)
 	return 0;
 
  err:
-	while (--i >= 0)
-		put_device(&idxd->engines[i]->conf_dev);
+	while (--i >= 0) {
+		engine = idxd->engines[i];
+		conf_dev = engine_confdev(engine);
+		put_device(conf_dev);
+	}
 	return rc;
 }
 
 static int idxd_setup_groups(struct idxd_device *idxd)
 {
 	struct device *dev = &idxd->pdev->dev;
+	struct device *conf_dev;
 	struct idxd_group *group;
 	int i, rc;
 
@@ -307,15 +320,17 @@ static int idxd_setup_groups(struct idxd_device *idxd)
 			goto err;
 		}
 
+		idxd_dev_set_type(&group->idxd_dev, IDXD_DEV_GROUP);
+		conf_dev = group_confdev(group);
 		group->id = i;
 		group->idxd = idxd;
-		device_initialize(&group->conf_dev);
-		group->conf_dev.parent = &idxd->conf_dev;
-		group->conf_dev.bus = &dsa_bus_type;
-		group->conf_dev.type = &idxd_group_device_type;
-		rc = dev_set_name(&group->conf_dev, "group%d.%d", idxd->id, group->id);
+		device_initialize(conf_dev);
+		conf_dev->parent = idxd_confdev(idxd);
+		conf_dev->bus = &dsa_bus_type;
+		conf_dev->type = &idxd_group_device_type;
+		rc = dev_set_name(conf_dev, "group%d.%d", idxd->id, group->id);
 		if (rc < 0) {
-			put_device(&group->conf_dev);
+			put_device(conf_dev);
 			goto err;
 		}
 
@@ -327,8 +342,10 @@ static int idxd_setup_groups(struct idxd_device *idxd)
 	return 0;
 
  err:
-	while (--i >= 0)
-		put_device(&idxd->groups[i]->conf_dev);
+	while (--i >= 0) {
+		group = idxd->groups[i];
+		put_device(group_confdev(group));
+	}
 	return rc;
 }
 
@@ -337,11 +354,11 @@ static void idxd_cleanup_internals(struct idxd_device *idxd)
 	int i;
 
 	for (i = 0; i < idxd->max_groups; i++)
-		put_device(&idxd->groups[i]->conf_dev);
+		put_device(group_confdev(idxd->groups[i]));
 	for (i = 0; i < idxd->max_engines; i++)
-		put_device(&idxd->engines[i]->conf_dev);
+		put_device(engine_confdev(idxd->engines[i]));
 	for (i = 0; i < idxd->max_wqs; i++)
-		put_device(&idxd->wqs[i]->conf_dev);
+		put_device(wq_confdev(idxd->wqs[i]));
 	destroy_workqueue(idxd->wq);
 }
 
@@ -381,13 +398,13 @@ static int idxd_setup_internals(struct idxd_device *idxd)
 
  err_wkq_create:
 	for (i = 0; i < idxd->max_groups; i++)
-		put_device(&idxd->groups[i]->conf_dev);
+		put_device(group_confdev(idxd->groups[i]));
  err_group:
 	for (i = 0; i < idxd->max_engines; i++)
-		put_device(&idxd->engines[i]->conf_dev);
+		put_device(engine_confdev(idxd->engines[i]));
  err_engine:
 	for (i = 0; i < idxd->max_wqs; i++)
-		put_device(&idxd->wqs[i]->conf_dev);
+		put_device(wq_confdev(idxd->wqs[i]));
  err_wqs:
 	kfree(idxd->int_handles);
 	return rc;
@@ -469,6 +486,7 @@ static void idxd_read_caps(struct idxd_device *idxd)
 static struct idxd_device *idxd_alloc(struct pci_dev *pdev, struct idxd_driver_data *data)
 {
 	struct device *dev = &pdev->dev;
+	struct device *conf_dev;
 	struct idxd_device *idxd;
 	int rc;
 
@@ -476,19 +494,21 @@ static struct idxd_device *idxd_alloc(struct pci_dev *pdev, struct idxd_driver_d
 	if (!idxd)
 		return NULL;
 
+	conf_dev = idxd_confdev(idxd);
 	idxd->pdev = pdev;
 	idxd->data = data;
+	idxd_dev_set_type(&idxd->idxd_dev, idxd->data->type);
 	idxd->id = ida_alloc(&idxd_ida, GFP_KERNEL);
 	if (idxd->id < 0)
 		return NULL;
 
-	device_initialize(&idxd->conf_dev);
-	idxd->conf_dev.parent = dev;
-	idxd->conf_dev.bus = &dsa_bus_type;
-	idxd->conf_dev.type = idxd->data->dev_type;
-	rc = dev_set_name(&idxd->conf_dev, "%s%d", idxd->data->name_prefix, idxd->id);
+	device_initialize(conf_dev);
+	conf_dev->parent = dev;
+	conf_dev->bus = &dsa_bus_type;
+	conf_dev->type = idxd->data->dev_type;
+	rc = dev_set_name(conf_dev, "%s%d", idxd->data->name_prefix, idxd->id);
 	if (rc < 0) {
-		put_device(&idxd->conf_dev);
+		put_device(conf_dev);
 		return NULL;
 	}
 
@@ -674,7 +694,7 @@ static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
  err:
 	pci_iounmap(pdev, idxd->reg_base);
  err_iomap:
-	put_device(&idxd->conf_dev);
+	put_device(idxd_confdev(idxd));
  err_idxd_alloc:
 	pci_disable_device(pdev);
 	return rc;
@@ -787,7 +807,7 @@ static void idxd_remove(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 	destroy_workqueue(idxd->wq);
 	perfmon_pmu_remove(idxd);
-	device_unregister(&idxd->conf_dev);
+	device_unregister(idxd_confdev(idxd));
 }
 
 static struct pci_driver idxd_pci_driver = {