From 350201cc09a58dcf5c49f636238b01637f5ee06d Mon Sep 17 00:00:00 2001 From: Laurentiu Tudor 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 Signed-off-by: Laurentiu Tudor --- 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 */