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Fri, 13 Mar 2026 08:33:40 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id +8fqOuTLs2lVSAAAD6G6ig (envelope-from ); Fri, 13 Mar 2026 08:33:40 +0000 Content-Type: multipart/mixed; boundary="------------7ZdkRrZrk9ysaFnV0R6IQqxK" Message-ID: Date: Fri, 13 Mar 2026 09:33:40 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 5/6] drm/gem-shmem: Track folio accessed/dirty status in mmap To: Biju Das , Tommaso Merciai Cc: "boris.brezillon@collabora.com" , "loic.molinari@collabora.com" , "willy@infradead.org" , "frank.binns@imgtec.com" , "matt.coster@imgtec.com" , "maarten.lankhorst@linux.intel.com" , "mripard@kernel.org" , "airlied@gmail.com" , "simona@ffwll.ch" , "linux-mm@kvack.org" , "dri-devel@lists.freedesktop.org" References: <20260227114509.165572-1-tzimmermann@suse.de> <20260227114509.165572-6-tzimmermann@suse.de> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi Am 12.03.26 um 18:46 schrieb Biju Das: > Hi Tommaso, > >> -----Original Message----- >> From: Tommaso Merciai >> Sent: 12 March 2026 17:37 >> Subject: Re: [PATCH v4 5/6] drm/gem-shmem: Track folio accessed/dirty status in mmap >> >> Hi Thomas, >> Thanks for your patch. >> >> I'm working on DSI support for RZ/G3E from this morning rebasing on top of next-20260311 I'm seeing >> that weston hang on my side: >> >> Reverting this patch fix the issue. >> (git revert 28e3918179aa) Just a guess, but maybe vm_file is NULL. The attached patch should handle this. Could either of you please test? Best regards Thomas >> >> I'm wondering if anyone encountered this issue? >> Thanks in advance. > > I am also seeing same issue on RZ/G3L with weston. > > Cheers, > Biju > > > >> Kind Regards, >> Tommaso >> >> On Fri, Feb 27, 2026 at 12:42:10PM +0100, Thomas Zimmermann wrote: >>> Invoke folio_mark_accessed() in mmap page faults to add the folio to >>> the memory manager's LRU list. Userspace invokes mmap to get the >>> memory for software rendering. Compositors do the same when creating >>> the final on-screen image, so keeping the pages in LRU makes sense. >>> Avoids paging out graphics buffers when under memory pressure. >>> >>> In pfn_mkwrite, further invoke the folio_mark_dirty() to add the folio >>> for writeback should the underlying file be paged out from system memory. >>> This rarely happens in practice, yet it would corrupt the buffer content. >>> >>> This has little effect on a system's hardware-accelerated rendering, >>> which only mmaps for an initial setup of textures, meshes, shaders, etc. >>> >>> v4: >>> - test for VM_FAULT_NOPAGE before marking folio as accessed (Boris) >>> - test page-array bounds in mkwrite handler (Boris) >>> v3: >>> - rewrite for VM_PFNMAP >>> v2: >>> - adapt to changes in drm_gem_shmem_try_mmap_pmd() >>> >>> Signed-off-by: Thomas Zimmermann >>> Reviewed-by: Boris Brezillon >>> --- >>> drivers/gpu/drm/drm_gem_shmem_helper.c | 22 ++++++++++++++++++++++ >>> 1 file changed, 22 insertions(+) >>> >>> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c >>> b/drivers/gpu/drm/drm_gem_shmem_helper.c >>> index cefa50eaf7a4..1ab2bbd3860c 100644 >>> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c >>> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c >>> @@ -598,6 +598,9 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf) >>> if (ret != VM_FAULT_NOPAGE) >>> ret = vmf_insert_pfn(vma, vmf->address, pfn); >>> >>> + if (ret == VM_FAULT_NOPAGE) >>> + folio_mark_accessed(folio); >>> + >>> out: >>> dma_resv_unlock(obj->resv); >>> >>> @@ -638,10 +641,29 @@ static void drm_gem_shmem_vm_close(struct vm_area_struct *vma) >>> drm_gem_vm_close(vma); >>> } >>> >>> +static vm_fault_t drm_gem_shmem_pfn_mkwrite(struct vm_fault *vmf) { >>> + struct vm_area_struct *vma = vmf->vma; >>> + struct drm_gem_object *obj = vma->vm_private_data; >>> + struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); >>> + loff_t num_pages = obj->size >> PAGE_SHIFT; >>> + pgoff_t page_offset = vmf->pgoff - vma->vm_pgoff; /* page offset >>> +within VMA */ >>> + >>> + if (drm_WARN_ON(obj->dev, !shmem->pages || page_offset >= num_pages)) >>> + return VM_FAULT_SIGBUS; >>> + >>> + file_update_time(vma->vm_file); >>> + >>> + folio_mark_dirty(page_folio(shmem->pages[page_offset])); >>> + >>> + return 0; >>> +} >>> + >>> const struct vm_operations_struct drm_gem_shmem_vm_ops = { >>> .fault = drm_gem_shmem_fault, >>> .open = drm_gem_shmem_vm_open, >>> .close = drm_gem_shmem_vm_close, >>> + .pfn_mkwrite = drm_gem_shmem_pfn_mkwrite, >>> }; >>> EXPORT_SYMBOL_GPL(drm_gem_shmem_vm_ops); >>> >>> -- >>> 2.52.0 >>> -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg) --------------7ZdkRrZrk9ysaFnV0R6IQqxK Content-Type: text/x-patch; charset=UTF-8; name="0001-test-for-vm_file-before-updating-file-access-time.patch" Content-Disposition: attachment; filename*0="0001-test-for-vm_file-before-updating-file-access-time.patch" Content-Transfer-Encoding: base64 RnJvbSBlNjQzNDZjNmIzZDk0NmU0NDI0MDY2ZDg4OGNiNDFmZTYwZWI5ZDg4IE1vbiBTZXAg MTcgMDA6MDA6MDAgMjAwMQpGcm9tOiBUaG9tYXMgWmltbWVybWFubiA8dHppbW1lcm1hbm5A c3VzZS5kZT4KRGF0ZTogRnJpLCAxMyBNYXIgMjAyNiAwOToyOToyNiArMDEwMApTdWJqZWN0 OiBbUEFUQ0hdIHRlc3QgZm9yIHZtX2ZpbGUgYmVmb3JlIHVwZGF0aW5nIGZpbGUgYWNjZXNz IHRpbWUKCi0tLQogZHJpdmVycy9ncHUvZHJtL2RybV9nZW1fc2htZW1faGVscGVyLmMgfCAz ICsrLQogMSBmaWxlIGNoYW5nZWQsIDIgaW5zZXJ0aW9ucygrKSwgMSBkZWxldGlvbigtKQoK ZGlmZiAtLWdpdCBhL2RyaXZlcnMvZ3B1L2RybS9kcm1fZ2VtX3NobWVtX2hlbHBlci5jIGIv ZHJpdmVycy9ncHUvZHJtL2RybV9nZW1fc2htZW1faGVscGVyLmMKaW5kZXggNDUwMGRlZWY0 MTI3Li43ZmFkNzJjYzAxZGMgMTAwNjQ0Ci0tLSBhL2RyaXZlcnMvZ3B1L2RybS9kcm1fZ2Vt X3NobWVtX2hlbHBlci5jCisrKyBiL2RyaXZlcnMvZ3B1L2RybS9kcm1fZ2VtX3NobWVtX2hl bHBlci5jCkBAIC02NTYsNyArNjU2LDggQEAgc3RhdGljIHZtX2ZhdWx0X3QgZHJtX2dlbV9z aG1lbV9wZm5fbWt3cml0ZShzdHJ1Y3Qgdm1fZmF1bHQgKnZtZikKIAlpZiAoZHJtX1dBUk5f T04ob2JqLT5kZXYsICFzaG1lbS0+cGFnZXMgfHwgcGFnZV9vZmZzZXQgPj0gbnVtX3BhZ2Vz KSkKIAkJcmV0dXJuIFZNX0ZBVUxUX1NJR0JVUzsKIAotCWZpbGVfdXBkYXRlX3RpbWUodm1h LT52bV9maWxlKTsKKwlpZiAodm1hLT52bV9maWxlKQorCQlmaWxlX3VwZGF0ZV90aW1lKHZt YS0+dm1fZmlsZSk7CiAKIAlmb2xpb19tYXJrX2RpcnR5KHBhZ2VfZm9saW8oc2htZW0tPnBh Z2VzW3BhZ2Vfb2Zmc2V0XSkpOwogCi0tIAoyLjUzLjAKCg== --------------7ZdkRrZrk9ysaFnV0R6IQqxK--