From 350201cc09a58dcf5c49f636238b01637f5ee06d Mon Sep 17 00:00:00 2001
From: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Date: Fri, 13 Apr 2018 11:35:10 +0300
Subject: [PATCH] bus: fsl-mc: Add dprc-reset-container support

DPRC-reset is required for VFIO and is missing from
mc-bus support.
This patch added reset-container support.

Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
---
 drivers/bus/fsl-mc/dprc.c           | 41 +++++++++++++++++++++++++++++++++++++
 drivers/bus/fsl-mc/fsl-mc-private.h | 10 +++++++++
 2 files changed, 51 insertions(+)

--- a/drivers/bus/fsl-mc/dprc.c
+++ b/drivers/bus/fsl-mc/dprc.c
@@ -73,6 +73,47 @@ int dprc_close(struct fsl_mc_io *mc_io,
 EXPORT_SYMBOL_GPL(dprc_close);
 
 /**
+ * dprc_reset_container - Reset child container.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRC object
+ * @child_container_id:	ID of the container to reset
+ *
+ * In case a software context crashes or becomes non-responsive, the parent
+ * may wish to reset its resources container before the software context is
+ * restarted.
+ *
+ * This routine informs all objects assigned to the child container that the
+ * container is being reset, so they may perform any cleanup operations that are
+ * needed. All objects handles that were owned by the child container shall be
+ * closed.
+ *
+ * Note that such request may be submitted even if the child software context
+ * has not crashed, but the resulting object cleanup operations will not be
+ * aware of that.
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprc_reset_container(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 token,
+			 int child_container_id)
+{
+	struct fsl_mc_command cmd = { 0 };
+	struct dprc_cmd_reset_container *cmd_params;
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPRC_CMDID_RESET_CONT,
+					  cmd_flags, token);
+	cmd_params = (struct dprc_cmd_reset_container *)cmd.params;
+	cmd_params->child_container_id = cpu_to_le32(child_container_id);
+
+	/* send command to mc*/
+	return mc_send_command(mc_io, &cmd);
+}
+EXPORT_SYMBOL_GPL(dprc_reset_container);
+
+/**
  * dprc_set_irq() - Set IRQ information for the DPRC to trigger an interrupt.
  * @mc_io:	Pointer to MC portal's I/O object
  * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
--- a/drivers/bus/fsl-mc/fsl-mc-private.h
+++ b/drivers/bus/fsl-mc/fsl-mc-private.h
@@ -93,6 +93,7 @@ int dpmcp_reset(struct fsl_mc_io *mc_io,
 #define DPRC_CMDID_GET_API_VERSION              DPRC_CMD(0xa05)
 
 #define DPRC_CMDID_GET_ATTR                     DPRC_CMD(0x004)
+#define DPRC_CMDID_RESET_CONT                   DPRC_CMD(0x005)
 
 #define DPRC_CMDID_SET_IRQ                      DPRC_CMD(0x010)
 #define DPRC_CMDID_SET_IRQ_ENABLE               DPRC_CMD(0x012)
@@ -111,6 +112,10 @@ struct dprc_cmd_open {
 	__le32 container_id;
 };
 
+struct dprc_cmd_reset_container {
+	__le32 child_container_id;
+};
+
 struct dprc_cmd_set_irq {
 	/* cmd word 0 */
 	__le32 irq_val;
@@ -394,6 +399,11 @@ int dprc_get_container_id(struct fsl_mc_
 			  u32 cmd_flags,
 			  int *container_id);
 
+int dprc_reset_container(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 token,
+			 int child_container_id);
+
 /*
  * Data Path Buffer Pool (DPBP) API
  */