dmaengine: idxd: add callback support for iaa crypto

Create a lightweight callback interface to allow idxd sub-drivers to
be notified when work sent to idxd wqs has completed.

For a sub-driver to be notified of work completion, it needs to:

  - Set the descriptor's 'Request Completion Interrupt'
    (IDXD_OP_FLAG_RCI)

  - Set the sub-driver desc_complete() callback when registering the
    sub-driver e.g.:

      struct idxd_device_driver my_drv = {
            .probe = my_probe,
            .desc_complete = my_complete,
      }

  - Set the sub-driver-specific context in the sub-driver's descriptor
    e.g:

      idxd_desc->crypto.req = req;
      idxd_desc->crypto.tfm = tfm;
      idxd_desc->crypto.src_addr = src_addr;
      idxd_desc->crypto.dst_addr = dst_addr;

When the work completes and the completion irq fires, idxd will invoke
the desc_complete() callback with pointers to the descriptor, context,
and completion_type.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
Acked-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 52 insertions, 10 deletions

diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
index 4b67181f4396..62ea21b25906 100644
--- a/drivers/dma/idxd/idxd.h
+++ b/drivers/dma/idxd/idxd.h
@@ -13,6 +13,7 @@
 #include <linux/bitmap.h>
 #include <linux/perf_event.h>
 #include <linux/iommu.h>
+#include <linux/crypto.h>
 #include <uapi/linux/idxd.h>
 #include "registers.h"
 
@@ -57,11 +58,23 @@ enum idxd_type {
 #define IDXD_ENQCMDS_RETRIES		32
 #define IDXD_ENQCMDS_MAX_RETRIES	64
 
+enum idxd_complete_type {
+	IDXD_COMPLETE_NORMAL = 0,
+	IDXD_COMPLETE_ABORT,
+	IDXD_COMPLETE_DEV_FAIL,
+};
+
+struct idxd_desc;
+
 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);
+	void (*desc_complete)(struct idxd_desc *desc,
+			      enum idxd_complete_type comp_type,
+			      bool free_desc,
+			      void *ctx, u32 *status);
 	struct device_driver drv;
 };
 
@@ -174,12 +187,6 @@ enum idxd_op_type {
 	IDXD_OP_NONBLOCK = 1,
 };
 
-enum idxd_complete_type {
-	IDXD_COMPLETE_NORMAL = 0,
-	IDXD_COMPLETE_ABORT,
-	IDXD_COMPLETE_DEV_FAIL,
-};
-
 struct idxd_dma_chan {
 	struct dma_chan chan;
 	struct idxd_wq *wq;
@@ -378,6 +385,14 @@ static inline unsigned int evl_size(struct idxd_device *idxd)
 	return idxd->evl->size * evl_ent_size(idxd);
 }
 
+struct crypto_ctx {
+	struct acomp_req *req;
+	struct crypto_tfm *tfm;
+	dma_addr_t src_addr;
+	dma_addr_t dst_addr;
+	bool compress;
+};
+
 /* IDXD software descriptor */
 struct idxd_desc {
 	union {
@@ -390,7 +405,10 @@ struct idxd_desc {
 		struct iax_completion_record *iax_completion;
 	};
 	dma_addr_t compl_dma;
-	struct dma_async_tx_descriptor txd;
+	union {
+		struct dma_async_tx_descriptor txd;
+		struct crypto_ctx crypto;
+	};
 	struct llist_node llnode;
 	struct list_head list;
 	int id;
@@ -417,6 +435,15 @@ enum idxd_completion_status {
 #define idxd_dev_to_idxd(idxd_dev) container_of(idxd_dev, struct idxd_device, idxd_dev)
 #define idxd_dev_to_wq(idxd_dev) container_of(idxd_dev, struct idxd_wq, idxd_dev)
 
+static inline struct idxd_device_driver *wq_to_idxd_drv(struct idxd_wq *wq)
+{
+	struct device *dev = wq_confdev(wq);
+	struct idxd_device_driver *idxd_drv =
+		container_of(dev->driver, struct idxd_device_driver, drv);
+
+	return idxd_drv;
+}
+
 static inline struct idxd_device *confdev_to_idxd(struct device *dev)
 {
 	struct idxd_dev *idxd_dev = confdev_to_idxd_dev(dev);
@@ -678,6 +705,24 @@ void idxd_driver_unregister(struct idxd_device_driver *idxd_drv);
 #define module_idxd_driver(__idxd_driver) \
 	module_driver(__idxd_driver, idxd_driver_register, idxd_driver_unregister)
 
+void idxd_free_desc(struct idxd_wq *wq, struct idxd_desc *desc);
+void idxd_dma_complete_txd(struct idxd_desc *desc,
+			   enum idxd_complete_type comp_type,
+			   bool free_desc, void *ctx, u32 *status);
+
+static inline void idxd_desc_complete(struct idxd_desc *desc,
+				      enum idxd_complete_type comp_type,
+				      bool free_desc)
+{
+	struct idxd_device_driver *drv;
+	u32 status;
+
+	drv = wq_to_idxd_drv(desc->wq);
+	if (drv->desc_complete)
+		drv->desc_complete(desc, comp_type, free_desc,
+				   &desc->txd, &status);
+}
+
 int idxd_register_bus_type(void);
 void idxd_unregister_bus_type(void);
 int idxd_register_devices(struct idxd_device *idxd);
@@ -731,14 +776,11 @@ int idxd_wq_request_irq(struct idxd_wq *wq);
 /* submission */
 int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc);
 struct idxd_desc *idxd_alloc_desc(struct idxd_wq *wq, enum idxd_op_type optype);
-void idxd_free_desc(struct idxd_wq *wq, struct idxd_desc *desc);
 int idxd_enqcmds(struct idxd_wq *wq, void __iomem *portal, const void *desc);
 
 /* dmaengine */
 int idxd_register_dma_device(struct idxd_device *idxd);
 void idxd_unregister_dma_device(struct idxd_device *idxd);
-void idxd_dma_complete_txd(struct idxd_desc *desc,
-			   enum idxd_complete_type comp_type, bool free_desc);
 
 /* cdev */
 int idxd_cdev_register(void);