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bus/fsl-mc: Add dprc-reset-container support

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DPRC reset is required by VFIO-mc in order to stop a device
to further generate DMA transactions.

Reviewed-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Acked-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
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>
Link: https://lore.kernel.org/r/20200929085441.17448-7-diana.craciun@oss.nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bharat Bhushan 2020-09-29 11:54:34 +03:00 committed by Greg Kroah-Hartman
parent 993577b2ef
commit 715b02ce89
3 changed files with 85 additions and 0 deletions
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71
drivers/bus/fsl-mc/dprc.c
View file

@ -80,6 +80,77 @@ 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
* @options: 32 bit options:
* - 0 (no bits set) - all the objects inside the container are
* reset. The child containers are entered recursively and the
* objects reset. All the objects (including the child containers)
* are closed.
* - bit 0 set - all the objects inside the container are reset.
* However the child containers are not entered recursively.
* This option is supported for API versions >= 6.5
* 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,
u32 options)
{
struct fsl_mc_command cmd = { 0 };
struct dprc_cmd_reset_container *cmd_params;
u32 cmdid = DPRC_CMDID_RESET_CONT;
int err;
/*
* If the DPRC object version was not yet cached, cache it now.
* Otherwise use the already cached value.
*/
if (!dprc_major_ver && !dprc_minor_ver) {
err = dprc_get_api_version(mc_io, 0,
&dprc_major_ver,
&dprc_minor_ver);
if (err)
return err;
}
/*
* MC API 6.5 introduced a new field in the command used to pass
* some flags.
* Bit 0 indicates that the child containers are not recursively reset.
*/
if (dprc_major_ver > 6 || (dprc_major_ver == 6 && dprc_minor_ver >= 5))
cmdid = DPRC_CMDID_RESET_CONT_V2;
/* prepare command */
cmd.header = mc_encode_cmd_header(cmdid, cmd_flags, token);
cmd_params = (struct dprc_cmd_reset_container *)cmd.params;
cmd_params->child_container_id = cpu_to_le32(child_container_id);
cmd_params->options = cpu_to_le32(options);
/* 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

7
drivers/bus/fsl-mc/fsl-mc-private.h
View file

@ -91,6 +91,8 @@ 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_RESET_CONT_V2 DPRC_CMD_V2(0x005)
#define DPRC_CMDID_SET_IRQ DPRC_CMD(0x010)
#define DPRC_CMDID_SET_IRQ_ENABLE DPRC_CMD(0x012)
@ -111,6 +113,11 @@ struct dprc_cmd_open {
__le32 container_id;
};
struct dprc_cmd_reset_container {
__le32 child_container_id;
__le32 options;
};
struct dprc_cmd_set_irq {
/* cmd word 0 */
__le32 irq_val;

7
include/linux/fsl/mc.h
View file

@ -524,6 +524,13 @@ static inline bool is_fsl_mc_bus_dpdmai(const struct fsl_mc_device *mc_dev)
return mc_dev->dev.type == &fsl_mc_bus_dpdmai_type;
}
#define DPRC_RESET_OPTION_NON_RECURSIVE 0x00000001
int dprc_reset_container(struct fsl_mc_io *mc_io,
u32 cmd_flags,
u16 token,
int child_container_id,
u32 options);
/*
* Data Path Buffer Pool (DPBP) API
* Contains initialization APIs and runtime control APIs for DPBP