Re: [PATCH v4 30/32] drm/xe/gt: Report 'Fault response' pagefault error using SIGID

[Michal Wajdeczko <michal.wajdeczko@intel.com>]

On 8/13/2026 8:37 PM, Rodrigo Vivi wrote:
> On Wed, Aug 12, 2026 at 09:14:46PM +0200, Michal Wajdeczko wrote:
>> Report 'Unsuccessful response' error using xe_log_err() helper.
>>
>> Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
>> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
>> Cc: Matthew Brost <matthew.brost@intel.com>
>> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
>> Cc: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
>> Cc: Mallesh Koujalagi <mallesh.koujalagi@intel.com>
>> ---
>> v2: rebased (Michal) reword message (Mallesh)
>> ---
>>  drivers/gpu/drm/xe/xe_pagefault.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/xe/xe_pagefault.c b/drivers/gpu/drm/xe/xe_pagefault.c
>> index 7e829c61387f..eb600c466187 100644
>> --- a/drivers/gpu/drm/xe/xe_pagefault.c
>> +++ b/drivers/gpu/drm/xe/xe_pagefault.c
>> @@ -14,6 +14,7 @@
>>  #include "xe_gt_types.h"
>>  #include "xe_gt_stats.h"
>>  #include "xe_hw_engine.h"
>> +#include "xe_log.h"
>>  #include "xe_pagefault.h"
>>  #include "xe_pagefault_types.h"
>>  #include "xe_svm.h"
>> @@ -625,8 +626,7 @@ static void xe_pagefault_queue_work(struct work_struct *w)
>>  				xe_pagefault_save_to_vm(gt_to_xe(gt), pf);
>>  				xe_pagefault_cache_start_invalidate(cache_start);
>>  				xe_pagefault_print(pf);
>> -				xe_gt_info(pf->gt, "Fault response: Unsuccessful %pe\n",
>> -					   ERR_PTR(err));
>> +				xe_log_err(pf->gt, PAGEFAULT, err, "Unsuccessful response\n");
> 
> I'm wondering if we should really go from info to err here...

my question was different:
	"why this err is only reported as info level?"
as once we hit this condition we also print large dump
(see xe_pagefault_print) likely for debug/diagnostics
so it seems important

@Matthew, comments?

> 
> Why not staying with xe_log_info or now?

I can change that for xe_log_info, but then (by design)
we will not print an error

> 
> But also, why err and not ERR_PTR(err)?

patch 10/32 [1] introduced helpers that take just errno
value and convert that into data { ERR_PTR(err), 0 } pair

[1] https://patchwork.freedesktop.org/patch/745993/?series=171022&rev=4

> 
>>  			} else {
>>  				xe_gt_stats_incr(pf->gt, XE_GT_STATS_ID_INVALID_PREFETCH_PAGEFAULT_COUNT, 1);
>>  				xe_gt_dbg(pf->gt, "Prefetch Fault response: Unsuccessful %pe\n",
>> -- 
>> 2.47.1
>>