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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: bp.renesas.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: TY3PR01MB11346.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 6d819d64-767a-450a-7fab-08de85c7372f X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2026 14:53:00.3770 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 53d82571-da19-47e4-9cb4-625a166a4a2a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: ZCZ0cpzunFaERir3zBOHqhZS1DtWo2toHVAq9Pshn+mPVYE3vNcpua6qP2SbmU04DxsJHnp39S5dZO2+AmWcRlvXYCCfaC5InjwO2LGQxqQ= X-MS-Exchange-Transport-CrossTenantHeadersStamped: OS3PR01MB8019 X-Rspamd-Queue-Id: 2E4B0140017 X-Rspamd-Server: rspam07 X-Stat-Signature: i8eus6h9teq81mnr4qxnh7juyp8mbmbw X-Rspam-User: X-HE-Tag: 1773931985-455957 X-HE-Meta: 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 1QjRY2cn yZnE/87L26khklM7saasTfALnB6jvVoR9vD+i0cQh7Xhd+5Av79Lw4nsgWImGNv56U3/MjhFBAXeDCQx4RQ+nlUKdfvrI3E0baLQ0rUF4QwSJp83IYGwmR9qvz1Bhc3BJFfPYPpP4lBQ5S1pMfM6hnTCKrbU8GdRn9mT6xi1q5udiw24W4MijBrnowMOpjGcLXUkqVr523m1TvLoJtBSh12WhaoQ6UPuKEcoZTORRNcYmWajuq3OKVBwcl/3gfUCiWapKbWPPIa5s2N3jg9tLnFLkq1VAK815TT0THKkbg2s6j2zVPY8s1cmbugMMv79exOJ26qudJO6qMo+BuL2xdad3X7GXg76cVa7a/h9nH7ufQScmi5IPDJ+dPVUGEvdcl3RnKL7R053+LDRm/NUWvMJpFb1eQtxHCRdL0Us54dyrInO3kn9BqsBpJlfVKm2t2uf7faFcKVxZ26oEEy5/cRaB31Nqk8dqa2eyZbVB+wtG506F44+oEiYq4wbRMOsIDrKKimMTjkah1RpNvj/aqIqh8aGcXbm/gsYKFOlTS+W3yWnq7JKb+hh33EG048fVI8lHC/khDUdwidsJWhHmPTuFAWmComLj7X8jzDqGy1P8qYADy9q+GKFu+PPVf2hSqH3Y+q0QP1/3pL6HJ0dUzLouI4lQfCdoswzRCnot/Qt/AB9GnhZqd6Uxydga8II9ZvDMlHdHNc/KXVDXcKkLeTRRaQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi Boris, > -----Original Message----- > From: dri-devel On Behalf Of Bo= ris Brezillon > Sent: 19 March 2026 14:50 > Subject: Re: [PATCH v4 5/6] drm/gem-shmem: Track folio accessed/dirty sta= tus in mmap >=20 > On Thu, 19 Mar 2026 14:17:31 +0000 > Biju Das wrote: >=20 > > Hi All, > > > > > -----Original Message----- > > > From: Biju Das > > > Sent: 14 March 2026 09:43 > > > Subject: RE: [PATCH v4 5/6] drm/gem-shmem: Track folio > > > accessed/dirty status in mmap > > > > > > Hi Boris Brezillon, > > > > > > > -----Original Message----- > > > > From: dri-devel On > > > > Behalf Of Boris Brezillon > > > > Sent: 13 March 2026 17:46 > > > > Subject: Re: [PATCH v4 5/6] drm/gem-shmem: Track folio > > > > accessed/dirty status in mmap > > > > > > > > On Fri, 13 Mar 2026 13:55:21 +0100 Boris Brezillon > > > > wrote: > > > > > > > > > On Fri, 13 Mar 2026 13:43:28 +0100 Boris Brezillon > > > > > wrote: > > > > > > > > > > > On Fri, 13 Mar 2026 13:18:35 +0100 Boris Brezillon > > > > > > wrote: > > > > > > > > > > > > > On Fri, 13 Mar 2026 12:04:25 +0000 Biju Das > > > > > > > wrote: > > > > > > > > > > > > > > > > -----Original Message----- > > > > > > > > > From: dri-devel > > > > > > > > > On Behalf Of > > > > > > > > > Boris Brezillon > > > > > > > > > Sent: 13 March 2026 11:57 > > > > > > > > > Subject: Re: [PATCH v4 5/6] drm/gem-shmem: Track folio > > > > > > > > > accessed/dirty status in mmap > > > > > > > > > > > > > > > > > > On Fri, 13 Mar 2026 11:29:47 +0100 Thomas Zimmermann > > > > > > > > > wrote: > > > > > > > > > > > > > > > > > > > Hi > > > > > > > > > > > > > > > > > > > > Am 13.03.26 um 11:18 schrieb Boris Brezillon: > > > > > > > > > > [...] > > > > > > > > > > >>>>> + if (drm_WARN_ON(obj->dev, !shmem->pages || page= _offset >=3D num_pages)) > > > > > > > > > > >>>>> + return VM_FAULT_SIGBUS; > > > > > > > > > > >>>>> + > > > > > > > > > > >>>>> + file_update_time(vma->vm_file); > > > > > > > > > > >>>>> + > > > > > > > > > > >>>>> + > > > > > > > > > > >>>>> +folio_mark_dirty(page_folio(shmem->pages[page_o > > > > > > > > > > >>>>> +ffse > > > > > > > > > > >>>>> +t])); > > > > > > > > > > > Do we need a folio_mark_dirty_lock() here? > > > > > > > > > > > > > > > > > > > > There is a helper for that with some documentation. > > > > > > > > > > [1] > > > > > > > > > > > > > > > > > > This [1] seems to solve the problem for me. Still unsure > > > > > > > > > about the folio_mark_dirty_lock vs folio_mark_dirty thoug= h. > > > > > > > > > > > > > > > > > > [1]https://yhbt.net/lore/dri-devel/20260312155027.168260 > > > > > > > > > 6-1- pedrodemargomes@gmail.com/ > > > > > > > > > > > > > > > > FYI, I used folio_mark_dirty_lock() still it does not solve= the issue with weston hang. > > > > > > > > > > > > > > The patch I pointed to has nothing to do with > > > > > > > folio_mark_dirty_lock(), It's a bug caused by huge page mappi= ng changes. > > > > > > > > > > > > Scratch that. I had a bunch of other changes on top, and it > > > > > > hangs again now that I dropped those. > > > > > > > > > > Seems like it's the combination of huge pages and mkwrite that's > > > > > causing issues, if I disable huge pages, it doesn't hang... > > > > > > > > I managed to have it working with the following diff. I still need > > > > to check why the "map-RO-split+RW- on-demand" approach doesn't > > > > work (races between huge_fault and pfn_mkwrite?), but I think it's > > > > okay to map the real thing writable on the first attempt anyway > > > > (we're not trying to do CoW here, since we're always pointing to > > > > the same page, it's just the permissions that change). Note that > > > > there's still the race fixed by > > > > https://yhbt.net/lore/dri-devel/20260312155027.1682606-1-pedrodema > > > > rgom es@gmail.com/ in this diff, I just tried to keep the diffstat > > > > minimal. > > > > > > I confirm with this diff, weston is now coming up on RZ/V2L SMARC EVK= . > > > > > > I am just using drm-misc-next + this diff + arm64 defconfig + Poky > > > (Yocto Project Reference Distro) > > > 5.0.11 + Mesa > > > > > > Cheers, > > > Biju > > > > > > > > > > > --->8--- > > > > diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c > > > > b/drivers/gpu/drm/drm_gem_shmem_helper.c > > > > index 4500deef4127..4efdce5a60f0 100644 > > > > --- a/drivers/gpu/drm/drm_gem_shmem_helper.c > > > > +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c > > > > @@ -561,9 +561,8 @@ static vm_fault_t drm_gem_shmem_try_insert_pfn_= pmd(struct vm_fault *vmf, > unsigne > > > > bool aligned =3D (vmf->address & ~PMD_MASK) =3D=3D (paddr & > > > > ~PMD_MASK); > > > > > > > > if (aligned && pmd_none(*vmf->pmd)) { > > > > - /* Read-only mapping; split upon write fault */ > > > > pfn &=3D PMD_MASK >> PAGE_SHIFT; > > > > - return vmf_insert_pfn_pmd(vmf, pfn, false); > > > > + return vmf_insert_pfn_pmd(vmf, pfn, vmf->flags & > > > > + FAULT_FLAG_WRITE); > > > > } > > > > #endif > > > > > > > > @@ -597,8 +596,12 @@ static vm_fault_t drm_gem_shmem_fault(struct > > > > vm_fault *vmf) > > > > > > > > pfn =3D page_to_pfn(page); > > > > > > > > - if (folio_test_pmd_mappable(folio)) > > > > + if (folio_test_pmd_mappable(folio)) { > > > > ret =3D drm_gem_shmem_try_insert_pfn_pmd(vmf, pfn); > > > > + if (ret =3D=3D VM_FAULT_NOPAGE && vmf->flags & FAUL= T_FLAG_WRITE) > > > > + folio_mark_dirty(folio); > > > > + } > > > > + > > > > if (ret !=3D VM_FAULT_NOPAGE) > > > > ret =3D vmf_insert_pfn(vma, vmf->address, pfn); > > > > > > > > Any patch available to fix the weston issue? Still the issue is > > present with drm-misc-next Please let me know. >=20 > Not yet. I want to land [1] first. I'll try to post an official version o= f the proposed fix tomorrow, > though I'd really like to have some inputs from the MM maintainers before= claiming this is the right > fix... >=20 > [1]https://yhbt.net/lore/dri-devel/20260319015224.46896-1-pedrodemargomes= @gmail.com/ Thanks for the update. Cheers, Biju