From mboxrd@z Thu Jan 1 00:00:00 1970 From: Swapna Nannapaneni Subject: Re: [PATCH 02/16] iommu: Introduce iommu domain types Date: Thu, 26 Mar 2015 08:52:51 -0400 Message-ID: <20150326125251.5005382.96732.4883@gmail.com> References: <1427373799-18662-1-git-send-email-joro@8bytes.org> <1427373799-18662-3-git-send-email-joro@8bytes.org> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <1427373799-18662-3-git-send-email-joro@8bytes.org> Sender: linux-samsung-soc-owner@vger.kernel.org To: iommu@lists.linux-foundation.org Cc: Will Deacon , Kukjin Kim , David Woodhouse , Heiko Stuebner , Hiroshi Doyu , Stephen Warren , Thierry Reding , Alexandre Courbot , Alex Williamson , Arnd Bergmann , Yingjoe Chen , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-tegra@vger.kernel.org, Joerg Roedel , jroedel@suse.de List-Id: iommu@lists.linux-foundation.org X Sent=A0from=A0my=A0BlackBerry=A010=A0smartphone=A0on=A0the=A0TELUS=A0ne= twork. =A0 Original Message =A0 =46rom: Joerg Roedel Sentuv: Thursday, March 26, 2015 8:51 AM To: iommu@lists.linux-foundation.org Cc: Will Deacon; Kukjin Kim; David Woodhouse; Heiko Stuebner; Hiroshi D= oyu; Stephen Warren; Thierry Reding; Alexandre Courbot; Alex Williamson= ; Arnd Bergmann; Yingjoe Chen; linux-kernel@vger.kernel.org; linux-arm-= kernel@lists.infradead.org; linux-samsung-soc@vger.kernel.org; linux-ro= ckchip@lists.infradead.org; linux-tegra@vger.kernel.org; Joerg Roedel; = jroedel@suse.de Subject: [PATCH 02/16] iommu: Introduce iommu domain types =46rom: Joerg Roedel This allows to handle domains differently based on their type in the future. An IOMMU driver can implement certain optimizations for DMA-API domains for example. The domain types can be extended later and some of the existing domain attributes can be migrated to become domain flags. Signed-off-by: Joerg Roedel --- drivers/iommu/iommu.c | 5 +++-- include/linux/iommu.h | 27 ++++++++++++++++++++++++++- 2 files changed, 29 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 11de262..4920605 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -909,14 +909,15 @@ struct iommu_domain *iommu_domain_alloc(struct bu= s_type *bus) ops =3D bus->iommu_ops; if (ops->domain_alloc) - domain =3D ops->domain_alloc(); + domain =3D ops->domain_alloc(IOMMU_DOMAIN_UNMANAGED); else domain =3D kzalloc(sizeof(*domain), GFP_KERNEL); if (!domain) return NULL; - domain->ops =3D bus->iommu_ops; + domain->ops =3D bus->iommu_ops; + domain->type =3D IOMMU_DOMAIN_UNMANAGED; if (ops->domain_init && domain->ops->domain_init(domain)) goto out_free; diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 69d1d12..72d03fe 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -51,7 +51,32 @@ struct iommu_domain_geometry { bool force_aperture; /* DMA only allowed in mappable range? */ }; +/* Domain feature flags */ +#define __IOMMU_DOMAIN_PAGING (1U << 0) /* Support for iommu_map/unmap= */ +#define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API + implementation */ +#define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */ + +/* + * This are the possible domain-types + * + * IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate + * devices + * IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses + * IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, us= ed + * for VMs + * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations. + * This flag allows IOMMU drivers to implement + * certain optimizations for these domains + */ +#define IOMMU_DOMAIN_BLOCKED (0U) +#define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT) +#define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING) +#define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \ + __IOMMU_DOMAIN_DMA_API) + struct iommu_domain { + unsigned type; const struct iommu_ops *ops; void *priv; iommu_fault_handler_t handler; @@ -117,7 +142,7 @@ struct iommu_ops { void (*domain_destroy)(struct iommu_domain *domain); /* Domain allocation and freeing by the iommu driver */ - struct iommu_domain *(*domain_alloc)(void); + struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type); void (*domain_free)(struct iommu_domain *); int (*attach_dev)(struct iommu_domain *domain, struct device *dev); --=20 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung= -soc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html