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Tue, 8 Jul 2025 21:48:59 +0000 From: Ethan MILON To: "iommu@lists.linux.dev" CC: David Woodhouse , Lu Baolu , CLEMENT MATHIEU--DRIF , Ethan MILON Subject: [PATCH 2/2] iommu/vt-d: Deduplicate cache_tag_flush_all by reusing flush_range Thread-Topic: [PATCH 2/2] iommu/vt-d: Deduplicate cache_tag_flush_all by reusing flush_range Thread-Index: AQHb8FIcrKLxrDextkKSlHvtVWu1RQ== Date: Tue, 8 Jul 2025 21:48:59 +0000 Message-ID: <20250708214821.30967-2-ethan.milon@eviden.com> References: <20250708214821.30967-1-ethan.milon@eviden.com> In-Reply-To: <20250708214821.30967-1-ethan.milon@eviden.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=eviden.com; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: VI0PR07MB10776:EE_|AS1PR07MB8456:EE_ x-ms-office365-filtering-correlation-id: b443302c-59a2-4e4a-e039-08ddbe693efd x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0;ARA:13230040|366016|1800799024|376014|38070700018; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: eviden.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: VI0PR07MB10776.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: b443302c-59a2-4e4a-e039-08ddbe693efd X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Jul 2025 21:48:59.4098 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 7d1c7785-2d8a-437d-b842-1ed5d8fbe00a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: M8aNVWmZAmYfMudK/F4+liTIKizhorPs8boId6csWkjMe5q+OFsyegFWIdW4UZ2v3kzUtQX0lgK7oegxWo+gOA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS1PR07MB8456 The logic in cache_tag_flush_all() to iterate over cache tags and issue TLB invalidations is largely duplicated in cache_tag_flush_range(), with the only difference being the range parameters. Extend cache_tag_flush_range() to handle a full address space flush when called with start =3D 0 and end =3D ULONG_MAX. This allows cache_tag_flush_all() to simply delegate to cache_tag_flush_range() Signed-off-by: Ethan Milon --- drivers/iommu/intel/cache.c | 34 ++++++++-------------------------- drivers/iommu/intel/trace.h | 5 ----- 2 files changed, 8 insertions(+), 31 deletions(-) diff --git a/drivers/iommu/intel/cache.c b/drivers/iommu/intel/cache.c index c8b79de84d3f..e69f04bd54bf 100644 --- a/drivers/iommu/intel/cache.c +++ b/drivers/iommu/intel/cache.c @@ -434,7 +434,13 @@ void cache_tag_flush_range(struct dmar_domain *domain,= unsigned long start, struct cache_tag *tag; unsigned long flags; =20 - addr =3D calculate_psi_aligned_address(start, end, &pages, &mask); + if (start =3D=3D 0 && end =3D=3D ULONG_MAX) { + addr =3D 0; + pages =3D -1; + mask =3D MAX_AGAW_PFN_WIDTH; + } else { + addr =3D calculate_psi_aligned_address(start, end, &pages, &mask); + } =20 spin_lock_irqsave(&domain->cache_lock, flags); list_for_each_entry(tag, &domain->cache_tags, node) { @@ -475,31 +481,7 @@ void cache_tag_flush_range(struct dmar_domain *domain,= unsigned long start, */ void cache_tag_flush_all(struct dmar_domain *domain) { - struct intel_iommu *iommu =3D NULL; - struct cache_tag *tag; - unsigned long flags; - - spin_lock_irqsave(&domain->cache_lock, flags); - list_for_each_entry(tag, &domain->cache_tags, node) { - if (iommu && iommu !=3D tag->iommu) - qi_batch_flush_descs(iommu, domain->qi_batch); - iommu =3D tag->iommu; - - switch (tag->type) { - case CACHE_TAG_IOTLB: - case CACHE_TAG_NESTING_IOTLB: - cache_tag_flush_iotlb(domain, tag, 0, -1, 0, 0); - break; - case CACHE_TAG_DEVTLB: - case CACHE_TAG_NESTING_DEVTLB: - cache_tag_flush_devtlb_psi(domain, tag, 0, MAX_AGAW_PFN_WIDTH); - break; - } - - trace_cache_tag_flush_all(tag); - } - qi_batch_flush_descs(iommu, domain->qi_batch); - spin_unlock_irqrestore(&domain->cache_lock, flags); + cache_tag_flush_range(domain, 0, ULONG_MAX, 0); } =20 /* diff --git a/drivers/iommu/intel/trace.h b/drivers/iommu/intel/trace.h index 9defdae6ebae..6311ba3f1691 100644 --- a/drivers/iommu/intel/trace.h +++ b/drivers/iommu/intel/trace.h @@ -130,11 +130,6 @@ DEFINE_EVENT(cache_tag_log, cache_tag_unassign, TP_ARGS(tag) ); =20 -DEFINE_EVENT(cache_tag_log, cache_tag_flush_all, - TP_PROTO(struct cache_tag *tag), - TP_ARGS(tag) -); - DECLARE_EVENT_CLASS(cache_tag_flush, TP_PROTO(struct cache_tag *tag, unsigned long start, unsigned long end, unsigned long addr, unsigned long pages, unsigned long mask), --=20 2.50.0