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platform_kernel-5.15
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vfio/fsl-mc: Add support for device reset 

Currently only resetting the DPRC container is supported which
will reset all the objects inside it. Resetting individual
objects is possible from the userspace by issueing commands
towards MC firmware.

Signed-off-by: Diana Craciun <diana.craciun@oss.nxp.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Diana Craciun 2020-10-05 20:36:54 +03:00 committed by Alex Williamson
parent 1bb141ed5e
commit ac93ab2bf6
1 changed files with 17 additions and 1 deletions
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18
drivers/vfio/fsl-mc/vfio_fsl_mc.c
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@ -217,6 +217,10 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
return -EINVAL;
info.flags = VFIO_DEVICE_FLAGS_FSL_MC;
if (is_fsl_mc_bus_dprc(mc_dev))
info.flags |= VFIO_DEVICE_FLAGS_RESET;
info.num_regions = mc_dev->obj_desc.region_count;
info.num_irqs = mc_dev->obj_desc.irq_count;
@ -299,7 +303,19 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
}
case VFIO_DEVICE_RESET:
{
return -ENOTTY;
int ret;
struct fsl_mc_device *mc_dev = vdev->mc_dev;
/* reset is supported only for the DPRC */
if (!is_fsl_mc_bus_dprc(mc_dev))
return -ENOTTY;
ret = dprc_reset_container(mc_dev->mc_io, 0,
mc_dev->mc_handle,
mc_dev->obj_desc.id,
DPRC_RESET_OPTION_NON_RECURSIVE);
return ret;
}
default:
return -ENOTTY;