Messages in this thread Patch in this message | | | From | Diana Craciun <> | Subject | [PATCH 06/10] bus/fsl-mc: Add dprc-reset-container support | Date | Thu, 19 Mar 2020 17:40:47 +0200 |
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From: Bharat Bhushan <Bharat.Bhushan@nxp.com>
DPRC reset is required by VFIO-mc in order to stop a device to further generate DMA transactions.
Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com> Signed-off-by: Diana Craciun <diana.craciun@oss.nxp.com> --- drivers/bus/fsl-mc/dprc.c | 41 +++++++++++++++++++++++++++++ drivers/bus/fsl-mc/fsl-mc-private.h | 5 ++++ include/linux/fsl/mc.h | 5 ++++ 3 files changed, 51 insertions(+)
diff --git a/drivers/bus/fsl-mc/dprc.c b/drivers/bus/fsl-mc/dprc.c index 602f030d84eb..5ae17fd957ba 100644 --- a/drivers/bus/fsl-mc/dprc.c +++ b/drivers/bus/fsl-mc/dprc.c @@ -72,6 +72,47 @@ 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 diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h b/drivers/bus/fsl-mc/fsl-mc-private.h index 81b9a9b16698..66ccf7fb34af 100644 --- a/drivers/bus/fsl-mc/fsl-mc-private.h +++ b/drivers/bus/fsl-mc/fsl-mc-private.h @@ -92,6 +92,7 @@ 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) @@ -112,6 +113,10 @@ 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; diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h index f997f8091408..b9d5e5955adb 100644 --- a/include/linux/fsl/mc.h +++ b/include/linux/fsl/mc.h @@ -471,6 +471,11 @@ static inline bool is_fsl_mc_bus_dpseci(const struct fsl_mc_device *mc_dev) return mc_dev->dev.type == &fsl_mc_bus_dpseci_type; } +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 * Contains initialization APIs and runtime control APIs for DPBP -- 2.17.1
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