From: Matthew Brost <matthew.brost@intel.com>
Date: Wed, 11 Sep 2024 01:18:20 +0000 (-0700)
Subject: drm/xe: Do not run GPU page fault handler on a closed VM
X-Git-Tag: v6.13-rc1~122^2~20^2~84
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f96dbf7c321d70834d46f3aedb75a671e839b51e;p=thirdparty%2Fkernel%2Flinux.git

drm/xe: Do not run GPU page fault handler on a closed VM

Closing a VM removes page table memory thus we shouldn't touch page
tables when a VM is closed. Do not run the GPU page fault handler once
the VM is closed to avoid touching page tables.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240911011820.825127-1-matthew.brost@intel.com
---

diff --git a/drivers/gpu/drm/xe/xe_gt_pagefault.c b/drivers/gpu/drm/xe/xe_gt_pagefault.c
index 730eec07795e2..00af059a8971a 100644
--- a/drivers/gpu/drm/xe/xe_gt_pagefault.c
+++ b/drivers/gpu/drm/xe/xe_gt_pagefault.c
@@ -212,6 +212,12 @@ static int handle_pagefault(struct xe_gt *gt, struct pagefault *pf)
 	 * TODO: Change to read lock? Using write lock for simplicity.
 	 */
 	down_write(&vm->lock);
+
+	if (xe_vm_is_closed(vm)) {
+		err = -ENOENT;
+		goto unlock_vm;
+	}
+
 	vma = lookup_vma(vm, pf->page_addr);
 	if (!vma) {
 		err = -EINVAL;