From: Zhu Lingshan <lingshan.zhu@amd.com>
Date: Mon, 30 Jun 2025 03:00:29 +0000 (+0800)
Subject: amdkfd: process USERPTR allocation only on the primary kfd process
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1707d5760c71b813fb5a4b6ccedcf21bc0ecb481;p=thirdparty%2Fkernel%2Flinux.git

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 <lingshan.zhu@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

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).