[PATCH v6 0/6] drm/xe/xe_vm: Implement xe_vm_get_faults_ioctl

[Lin, Shuicheng]

One generic question, do we have test case to verify whether the function is working correctly? Thanks.
I think we could have IGT test case to trigger the fault, then have another IGT test case to query it with this new uapi.
And make sure we could get the expected data with the new uapi.

Shuicheng 

On Fri, Mar 7, 2025 2:41 PM Cavitt, Jonathan wrote
> Add additional information to each VM so they can report up to the first
> 50 seen pagefaults.  Only failed pagefaults are saved this way, as successful
> pagefaults should recover and not need to be reported to userspace.
> 
> Additionally, add a new ioctl - xe_vm_get_faults_ioctl - that allows the user to
> query these pagefaults
> 
> v2: (Matt Brost)
> - Break full ban list request into a separate property.
> - Reformat drm_xe_vm_get_property struct.
> - Remove need for drm_xe_faults helper struct.
> - Separate data pointer and scalar return value in ioctl.
> - Get address type on pagefault report and save it to the pagefault.
> - Correctly reject writes to read-only VMAs.
> - Miscellaneous formatting fixes.
> 
> v3: (Matt Brost)
> - Only allow querying of failed pagefaults
> 
> v4:
> - Remove unnecessary size parameter from helper function, as it
>   is a property of the arguments. (jcavitt)
> - Remove unnecessary copy_from_user (Jainxun)
> - Set address_precision to 1 (Jainxun)
> - Report max size instead of dynamic size for memory allocation
>   purposes.  Total memory usage is reported separately.
> 
> v5:
> - Return int from xe_vm_get_property_size (Shuicheng)
> - Fix memory leak (Shuicheng)
> - Remove unnecessary size variable (jcavitt)
> 
> v6:
> - Free vm after use (Shuicheng)
> - Compress pf copy logic (Shuicheng)
> - Update fault_unsuccessful before storing (Shuicheng)
> - Fix old struct name in comments (Shuicheng)
> - Keep first 50 pagefaults instead of last 50 (Jianxun)
> - Rename ioctl to xe_vm_get_faults_ioctl (jcavitt)
> 
> Signed-off-by: Jonathan Cavitt <joanthan.cavitt at intel.com>
> Suggested-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Suggested-by: Matthew Brost <matthew.brost at intel.com>
> CC: Zhang Jianxun <jianxun.zhang at intel.com>
> CC: Shuicheng Lin <shuicheng.lin at intel.com>
> 
> Jonathan Cavitt (6):
>   drm/xe/xe_gt_pagefault: Disallow writes to read-only VMAs
>   drm/xe/xe_gt_pagefault: Migrate pagefault struct to header
>   drm/xe/xe_vm: Add per VM pagefault info
>   drm/xe/uapi: Define drm_xe_vm_get_faults
>   drm/xe/xe_gt_pagefault: Add address_type field to pagefaults
>   drm/xe/xe_vm: Implement xe_vm_get_faults_ioctl
> 
>  drivers/gpu/drm/xe/xe_device.c       |   3 +
>  drivers/gpu/drm/xe/xe_gt_pagefault.c |  64 +++++++-------
> drivers/gpu/drm/xe/xe_gt_pagefault.h |  29 +++++++
>  drivers/gpu/drm/xe/xe_vm.c           | 120 +++++++++++++++++++++++++++
>  drivers/gpu/drm/xe/xe_vm.h           |   8 ++
>  drivers/gpu/drm/xe/xe_vm_types.h     |  20 +++++
>  include/uapi/drm/xe_drm.h            |  49 +++++++++++
>  7 files changed, 260 insertions(+), 33 deletions(-)
> 
> --
> 2.43.0