From 1707d5760c71b813fb5a4b6ccedcf21bc0ecb481 Mon Sep 17 00:00:00 2001 From: Zhu Lingshan Date: Mon, 30 Jun 2025 11:00:29 +0800 Subject: [PATCH] amdkfd: process USERPTR allocation only on the primary kfd process The lifecycle of the primary kfd process is tied to the user space program, all secondary kfd process would be destroyed when fd close. Thus only the primary kfd process should process USERPTR memory allocation. Signed-off-by: Zhu Lingshan Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c index 2226281e8146..ff1a6a903463 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c @@ -1062,6 +1062,12 @@ static int kfd_ioctl_alloc_memory_of_gpu(struct file *filep, if (args->size == 0) return -EINVAL; + if (p->context_id != KFD_CONTEXT_ID_PRIMARY && (flags & KFD_IOC_ALLOC_MEM_FLAGS_USERPTR)) { + pr_debug("USERPTR is not supported on non-primary kfd_process\n"); + + return -EOPNOTSUPP; + } + #if IS_ENABLED(CONFIG_HSA_AMD_SVM) /* Flush pending deferred work to avoid racing with deferred actions * from previous memory map changes (e.g. munmap). -- 2.47.3