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[209.85.210.170]) by smtp.gmail.com with ESMTPSA id b7sm3193758pfi.42.2021.04.22.19.53.20 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Apr 2021 19:53:20 -0700 (PDT) Received: by mail-pf1-f170.google.com with SMTP id m11so33139217pfc.11 for ; Thu, 22 Apr 2021 19:53:20 -0700 (PDT) X-Received: by 2002:a6b:c913:: with SMTP id z19mr1627785iof.50.1619146389385; Thu, 22 Apr 2021 19:53:09 -0700 (PDT) MIME-Version: 1.0 References: <20210422081508.3942748-1-tientzu@chromium.org> <20210422081508.3942748-17-tientzu@chromium.org> In-Reply-To: <20210422081508.3942748-17-tientzu@chromium.org> From: Claire Chang Date: Fri, 23 Apr 2021 10:52:58 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v5 16/16] of: Add plumbing for restricted DMA pool To: Joerg Roedel , Will Deacon , Frank Rowand , Konrad Rzeszutek Wilk , boris.ostrovsky@oracle.com, jgross@suse.com, Christoph Hellwig , Marek Szyprowski Cc: benh@kernel.crashing.org, paulus@samba.org, "list@263.net:IOMMU DRIVERS" , sstabellini@kernel.org, Robin Murphy , grant.likely@arm.com, xypron.glpk@gmx.de, Thierry Reding , mingo@kernel.org, bauerman@linux.ibm.com, peterz@infradead.org, Greg KH , Saravana Kannan , "Rafael J . Wysocki" , heikki.krogerus@linux.intel.com, Andy Shevchenko , Randy Dunlap , Dan Williams , Bartosz Golaszewski , linux-devicetree , lkml , linuxppc-dev@lists.ozlabs.org, xen-devel@lists.xenproject.org, Nicolas Boichat , Jim Quinlan , Tomasz Figa , bskeggs@redhat.com, bhelgaas@google.com, chris@chris-wilson.co.uk, daniel@ffwll.ch, airlied@linux.ie, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, jani.nikula@linux.intel.com, jxgao@google.com, joonas.lahtinen@linux.intel.com, linux-pci@vger.kernel.org, maarten.lankhorst@linux.intel.com, matthew.auld@intel.com, nouveau@lists.freedesktop.org, rodrigo.vivi@intel.com, thomas.hellstrom@linux.intel.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Thu, Apr 22, 2021 at 4:17 PM Claire Chang wrote: > > If a device is not behind an IOMMU, we look up the device node and set > up the restricted DMA when the restricted-dma-pool is presented. > > Signed-off-by: Claire Chang > --- > drivers/of/address.c | 25 +++++++++++++++++++++++++ > drivers/of/device.c | 3 +++ > drivers/of/of_private.h | 5 +++++ > 3 files changed, 33 insertions(+) > > diff --git a/drivers/of/address.c b/drivers/of/address.c > index 54f221dde267..fff3adfe4986 100644 > --- a/drivers/of/address.c > +++ b/drivers/of/address.c > @@ -8,6 +8,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -1109,6 +1110,30 @@ bool of_dma_is_coherent(struct device_node *np) > } > EXPORT_SYMBOL_GPL(of_dma_is_coherent); > > +int of_dma_set_restricted_buffer(struct device *dev) > +{ > + struct device_node *node; > + int count, i; > + > + if (!dev->of_node) > + return 0; > + > + count = of_property_count_elems_of_size(dev->of_node, "memory-region", > + sizeof(phandle)); > + for (i = 0; i < count; i++) { > + node = of_parse_phandle(dev->of_node, "memory-region", i); > + /* There might be multiple memory regions, but only one > + * restriced-dma-pool region is allowed. > + */ > + if (of_device_is_compatible(node, "restricted-dma-pool") && > + of_device_is_available(node)) > + return of_reserved_mem_device_init_by_idx( > + dev, dev->of_node, i); > + } > + > + return 0; > +} > + > /** > * of_mmio_is_nonposted - Check if device uses non-posted MMIO > * @np: device node > diff --git a/drivers/of/device.c b/drivers/of/device.c > index c5a9473a5fb1..d8d865223e51 100644 > --- a/drivers/of/device.c > +++ b/drivers/of/device.c > @@ -165,6 +165,9 @@ int of_dma_configure_id(struct device *dev, struct device_node *np, > > arch_setup_dma_ops(dev, dma_start, size, iommu, coherent); > > + if (!iommu) > + return of_dma_set_restricted_buffer(dev); > + > return 0; > } > EXPORT_SYMBOL_GPL(of_dma_configure_id); > diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h > index d717efbd637d..e9237f5eff48 100644 > --- a/drivers/of/of_private.h > +++ b/drivers/of/of_private.h > @@ -163,12 +163,17 @@ struct bus_dma_region; > #if defined(CONFIG_OF_ADDRESS) && defined(CONFIG_HAS_DMA) > int of_dma_get_range(struct device_node *np, > const struct bus_dma_region **map); > +int of_dma_set_restricted_buffer(struct device *dev); > #else > static inline int of_dma_get_range(struct device_node *np, > const struct bus_dma_region **map) > { > return -ENODEV; > } > +static inline int of_dma_get_restricted_buffer(struct device *dev) This one should be of_dma_set_restricted_buffer. Sorry for the typo. > +{ > + return -ENODEV; > +} > #endif > > #endif /* _LINUX_OF_PRIVATE_H */ > -- > 2.31.1.368.gbe11c130af-goog >