Re: [PATCH V1] accel/amdxdna: Skip unmapped range in aie2_populate_range()

[Lizhi Hou <lizhi.hou@amd.com>]

Applied to drm-misc-fixes

On 8/12/26 14:26, Max Zhen wrote:
>
>
> On 8/12/2026 Wed 13:56, Lizhi Hou wrote:
>> aie2_populate_range() incorrectly failed jobs for BOs with multiple
>> mmaps: if the unmapped entry appeared first in umap_list, the loop would
>> pick it up, call hmm_range_fault() on a gone VMA, and return -EFAULT
>> without ever trying the remaining valid mapps.
>>
>> Fix it by skipping unmapped entries. After the loop, if the map list is
>> empty or all maps are valid, map_invalid can be cleared normally.
>>
>> Fixes: e486147c912f ("accel/amdxdna: Add BO import and export")
>> Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
> Reviewed-by: Max Zhen <max.zhen@amd.com>
>> ---
>>   drivers/accel/amdxdna/aie2_ctx.c | 16 ++++++++++++++++
>>   1 file changed, 16 insertions(+)
>>
>> diff --git a/drivers/accel/amdxdna/aie2_ctx.c 
>> b/drivers/accel/amdxdna/aie2_ctx.c
>> index 4b3a62aa8798..8d9c283f606a 100644
>> --- a/drivers/accel/amdxdna/aie2_ctx.c
>> +++ b/drivers/accel/amdxdna/aie2_ctx.c
>> @@ -1052,6 +1052,16 @@ static int aie2_populate_range(struct 
>> amdxdna_gem_obj *abo)
>>       found = false;
>>       down_write(&xdna->notifier_lock);
>>       list_for_each_entry(mapp, &abo->mem.umap_list, node) {
>> +        /*
>> +         * Skip entries that have already been unmapped.
>> +         *
>> +         * If userspace unmaps the address and later submits I/O using
>> +         * it, the IOMMU will reject the access and report a fault.
>> +         * Ignore such entries here.
>> +         */
>> +        if (mapp->unmapped)
>> +            continue;
>> +
>>           if (mapp->invalid && kref_get_unless_zero(&mapp->refcnt)) {
>>               found = true;
>>               break;
>> @@ -1059,6 +1069,12 @@ static int aie2_populate_range(struct 
>> amdxdna_gem_obj *abo)
>>       }
>>         if (!found) {
>> +        /*
>> +         * This also covers the case where all mappings have been
>> +         * removed. There are no invalid mappings left to process.
>> +         * Any subsequent I/O using the unmapped address will be
>> +         * rejected by the IOMMU.
>> +         */
>>           abo->mem.map_invalid = false;
>>           up_write(&xdna->notifier_lock);
>>           return 0;
>