dmaengine: idxd: remove detection of device type

Move all static data type for per device type to an idxd_driver_data data
structure. The data can be attached to the pci_device_id and provided by
the pci probe function. This removes a lot of unnecessary type detection
and setup code.
Suggested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/161852988924.2203940.2787590808682466398.stgit@djiang5-desk3.ch.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/idxd/cdev.c

@@ -45,7 +45,7 @@ static void idxd_cdev_dev_release(struct device *dev)
 	struct idxd_cdev_context *cdev_ctx;
 	struct idxd_wq *wq = idxd_cdev->wq;
 
-	cdev_ctx = &ictx[wq->idxd->type];
+	cdev_ctx = &ictx[wq->idxd->data->type];
 	ida_simple_remove(&cdev_ctx->minor_ida, idxd_cdev->minor);
 	kfree(idxd_cdev);
 }
@@ -239,7 +239,7 @@ static const struct file_operations idxd_cdev_fops = {
 
 int idxd_cdev_get_major(struct idxd_device *idxd)
 {
-	return MAJOR(ictx[idxd->type].devt);
+	return MAJOR(ictx[idxd->data->type].devt);
 }
 
 int idxd_wq_add_cdev(struct idxd_wq *wq)
@@ -258,7 +258,7 @@ int idxd_wq_add_cdev(struct idxd_wq *wq)
 	idxd_cdev->wq = wq;
 	cdev = &idxd_cdev->cdev;
 	dev = &idxd_cdev->dev;
-	cdev_ctx = &ictx[wq->idxd->type];
+	cdev_ctx = &ictx[wq->idxd->data->type];
 	minor = ida_simple_get(&cdev_ctx->minor_ida, 0, MINORMASK, GFP_KERNEL);
 	if (minor < 0) {
 		kfree(idxd_cdev);
@@ -272,8 +272,7 @@ int idxd_wq_add_cdev(struct idxd_wq *wq)
 	dev->type = &idxd_cdev_device_type;
 	dev->devt = MKDEV(MAJOR(cdev_ctx->devt), minor);
 
-	rc = dev_set_name(dev, "%s/wq%u.%u", idxd_get_dev_name(idxd),
-			  idxd->id, wq->id);
+	rc = dev_set_name(dev, "%s/wq%u.%u", idxd->data->name_prefix, idxd->id, wq->id);
 	if (rc < 0)
 		goto err;
 
@@ -298,7 +297,7 @@ void idxd_wq_del_cdev(struct idxd_wq *wq)
 	struct idxd_cdev *idxd_cdev;
 	struct idxd_cdev_context *cdev_ctx;
 
-	cdev_ctx = &ictx[wq->idxd->type];
+	cdev_ctx = &ictx[wq->idxd->data->type];
 	idxd_cdev = wq->idxd_cdev;
 	wq->idxd_cdev = NULL;
 	cdev_device_del(&idxd_cdev->cdev, &idxd_cdev->dev);

drivers/dma/idxd/device.c

@@ -144,14 +144,8 @@ int idxd_wq_alloc_resources(struct idxd_wq *wq)
 	if (rc < 0)
 		return rc;
 
-	if (idxd->type == IDXD_TYPE_DSA)
-		align = 32;
-	else if (idxd->type == IDXD_TYPE_IAX)
-		align = 64;
-	else
-		return -ENODEV;
-
-	wq->compls_size = num_descs * idxd->compl_size + align;
+	align = idxd->data->align;
+	wq->compls_size = num_descs * idxd->data->compl_size + align;
 	wq->compls_raw = dma_alloc_coherent(dev, wq->compls_size,
 					    &wq->compls_addr_raw, GFP_KERNEL);
 	if (!wq->compls_raw) {
@@ -178,11 +172,11 @@ int idxd_wq_alloc_resources(struct idxd_wq *wq)
 		struct idxd_desc *desc = wq->descs[i];
 
 		desc->hw = wq->hw_descs[i];
-		if (idxd->type == IDXD_TYPE_DSA)
+		if (idxd->data->type == IDXD_TYPE_DSA)
 			desc->completion = &wq->compls[i];
-		else if (idxd->type == IDXD_TYPE_IAX)
+		else if (idxd->data->type == IDXD_TYPE_IAX)
 			desc->iax_completion = &wq->iax_compls[i];
-		desc->compl_dma = wq->compls_addr + idxd->compl_size * i;
+		desc->compl_dma = wq->compls_addr + idxd->data->compl_size * i;
 		desc->id = i;
 		desc->wq = wq;
 		desc->cpu = -1;

drivers/dma/idxd/idxd.h

@@ -178,9 +178,17 @@ struct idxd_dma_dev {
 	struct dma_device dma;
 };
 
-struct idxd_device {
+struct idxd_driver_data {
+	const char *name_prefix;
 	enum idxd_type type;
+	struct device_type *dev_type;
+	int compl_size;
+	int align;
+};
+
+struct idxd_device {
 	struct device conf_dev;
+	struct idxd_driver_data *data;
 	struct list_head list;
 	struct idxd_hw hw;
 	enum idxd_device_state state;
@@ -218,7 +226,6 @@ struct idxd_device {
 	int token_limit;
 	int nr_tokens;		/* non-reserved tokens */
 	unsigned int wqcfg_size;
-	int compl_size;
 
 	union sw_err_reg sw_err;
 	wait_queue_head_t cmd_waitq;
@@ -347,14 +354,12 @@ static inline int idxd_wq_refcount(struct idxd_wq *wq)
 	return wq->client_count;
 };
 
-const char *idxd_get_dev_name(struct idxd_device *idxd);
 int idxd_register_bus_type(void);
 void idxd_unregister_bus_type(void);
 int idxd_register_devices(struct idxd_device *idxd);
 void idxd_unregister_devices(struct idxd_device *idxd);
 int idxd_register_driver(void);
 void idxd_unregister_driver(void);
-struct device_type *idxd_get_device_type(struct idxd_device *idxd);
 
 /* device interrupt control */
 void idxd_msix_perm_setup(struct idxd_device *idxd);

drivers/dma/idxd/init.c

@@ -35,26 +35,33 @@ MODULE_PARM_DESC(sva, "Toggle SVA support on/off");
 bool support_enqcmd;
 DEFINE_IDA(idxd_ida);
 
+static struct idxd_driver_data idxd_driver_data[] = {
+	[IDXD_TYPE_DSA] = {
+		.name_prefix = "dsa",
+		.type = IDXD_TYPE_DSA,
+		.compl_size = sizeof(struct dsa_completion_record),
+		.align = 32,
+		.dev_type = &dsa_device_type,
+	},
+	[IDXD_TYPE_IAX] = {
+		.name_prefix = "iax",
+		.type = IDXD_TYPE_IAX,
+		.compl_size = sizeof(struct iax_completion_record),
+		.align = 64,
+		.dev_type = &iax_device_type,
+	},
+};
+
 static struct pci_device_id idxd_pci_tbl[] = {
 	/* DSA ver 1.0 platforms */
-	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_DSA_SPR0) },
+	{ PCI_DEVICE_DATA(INTEL, DSA_SPR0, &idxd_driver_data[IDXD_TYPE_DSA]) },
 
 	/* IAX ver 1.0 platforms */
-	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IAX_SPR0) },
+	{ PCI_DEVICE_DATA(INTEL, IAX_SPR0, &idxd_driver_data[IDXD_TYPE_IAX]) },
 	{ 0, }
 };
 MODULE_DEVICE_TABLE(pci, idxd_pci_tbl);
 
-static char *idxd_name[] = {
-	"dsa",
-	"iax"
-};
-
-const char *idxd_get_dev_name(struct idxd_device *idxd)
-{
-	return idxd_name[idxd->type];
-}
-
 static int idxd_setup_interrupts(struct idxd_device *idxd)
 {
 	struct pci_dev *pdev = idxd->pdev;
@@ -379,19 +386,7 @@ static void idxd_read_caps(struct idxd_device *idxd)
 	}
 }
 
-static inline void idxd_set_type(struct idxd_device *idxd)
-{
-	struct pci_dev *pdev = idxd->pdev;
-
-	if (pdev->device == PCI_DEVICE_ID_INTEL_DSA_SPR0)
-		idxd->type = IDXD_TYPE_DSA;
-	else if (pdev->device == PCI_DEVICE_ID_INTEL_IAX_SPR0)
-		idxd->type = IDXD_TYPE_IAX;
-	else
-		idxd->type = IDXD_TYPE_UNKNOWN;
-}
-
-static struct idxd_device *idxd_alloc(struct pci_dev *pdev)
+static struct idxd_device *idxd_alloc(struct pci_dev *pdev, struct idxd_driver_data *data)
 {
 	struct device *dev = &pdev->dev;
 	struct idxd_device *idxd;
@@ -402,7 +397,7 @@ static struct idxd_device *idxd_alloc(struct pci_dev *pdev)
 		return NULL;
 
 	idxd->pdev = pdev;
-	idxd_set_type(idxd);
+	idxd->data = data;
 	idxd->id = ida_alloc(&idxd_ida, GFP_KERNEL);
 	if (idxd->id < 0)
 		return NULL;
@@ -410,8 +405,8 @@ static struct idxd_device *idxd_alloc(struct pci_dev *pdev)
 	device_initialize(&idxd->conf_dev);
 	idxd->conf_dev.parent = dev;
 	idxd->conf_dev.bus = &dsa_bus_type;
-	idxd->conf_dev.type = idxd_get_device_type(idxd);
-	rc = dev_set_name(&idxd->conf_dev, "%s%d", idxd_get_dev_name(idxd), idxd->id);
+	idxd->conf_dev.type = idxd->data->dev_type;
+	rc = dev_set_name(&idxd->conf_dev, "%s%d", idxd->data->name_prefix, idxd->id);
 	if (rc < 0) {
 		put_device(&idxd->conf_dev);
 		return NULL;
@@ -503,18 +498,11 @@ static int idxd_probe(struct idxd_device *idxd)
 	return rc;
 }
 
-static void idxd_type_init(struct idxd_device *idxd)
-{
-	if (idxd->type == IDXD_TYPE_DSA)
-		idxd->compl_size = sizeof(struct dsa_completion_record);
-	else if (idxd->type == IDXD_TYPE_IAX)
-		idxd->compl_size = sizeof(struct iax_completion_record);
-}
-
 static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct device *dev = &pdev->dev;
 	struct idxd_device *idxd;
+	struct idxd_driver_data *data = (struct idxd_driver_data *)id->driver_data;
 	int rc;
 
 	rc = pci_enable_device(pdev);
@@ -522,7 +510,7 @@ static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		return rc;
 
 	dev_dbg(dev, "Alloc IDXD context\n");
-	idxd = idxd_alloc(pdev);
+	idxd = idxd_alloc(pdev, data);
 	if (!idxd) {
 		rc = -ENOMEM;
 		goto err_idxd_alloc;
@@ -548,9 +536,6 @@ static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (rc)
 		goto err;
 
-
-	idxd_type_init(idxd);
-
 	dev_dbg(dev, "Set PCI master\n");
 	pci_set_master(pdev);
 	pci_set_drvdata(pdev, idxd);

drivers/dma/idxd/submit.c

@@ -15,7 +15,7 @@ static struct idxd_desc *__get_desc(struct idxd_wq *wq, int idx, int cpu)
 
 	desc = wq->descs[idx];
 	memset(desc->hw, 0, sizeof(struct dsa_hw_desc));
-	memset(desc->completion, 0, idxd->compl_size);
+	memset(desc->completion, 0, idxd->data->compl_size);
 	desc->cpu = cpu;
 
 	if (device_pasid_enabled(idxd))

drivers/dma/idxd/sysfs.c

@@ -310,16 +310,6 @@ static struct idxd_device_driver dsa_drv = {
 	},
 };
 
-struct device_type *idxd_get_device_type(struct idxd_device *idxd)
-{
-	if (idxd->type == IDXD_TYPE_DSA)
-		return &dsa_device_type;
-	else if (idxd->type == IDXD_TYPE_IAX)
-		return &iax_device_type;
-	else
-		return NULL;
-}
-
 /* IDXD generic driver setup */
 int idxd_register_driver(void)
 {
@@ -453,7 +443,7 @@ static ssize_t group_tokens_reserved_store(struct device *dev,
 	if (rc < 0)
 		return -EINVAL;
 
-	if (idxd->type == IDXD_TYPE_IAX)
+	if (idxd->data->type == IDXD_TYPE_IAX)
 		return -EOPNOTSUPP;
 
 	if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
@@ -501,7 +491,7 @@ static ssize_t group_tokens_allowed_store(struct device *dev,
 	if (rc < 0)
 		return -EINVAL;
 
-	if (idxd->type == IDXD_TYPE_IAX)
+	if (idxd->data->type == IDXD_TYPE_IAX)
 		return -EOPNOTSUPP;
 
 	if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
@@ -546,7 +536,7 @@ static ssize_t group_use_token_limit_store(struct device *dev,
 	if (rc < 0)
 		return -EINVAL;
 
-	if (idxd->type == IDXD_TYPE_IAX)
+	if (idxd->data->type == IDXD_TYPE_IAX)
 		return -EOPNOTSUPP;
 
 	if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))