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[177.131.65.187]) by smtp.gmail.com with ESMTPSA id o6sm5235503qtd.59.2020.06.18.22.07.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Jun 2020 22:07:30 -0700 (PDT) From: Leonardo Bras To: Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Alexey Kardashevskiy , Leonardo Bras , Thiago Jung Bauermann , Ram Pai Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/4] powerpc/pseries/iommu: Implement ibm,reset-pe-dma-windows rtas call Date: Fri, 19 Jun 2020 02:06:18 -0300 Message-Id: <20200619050619.266888-3-leobras.c@gmail.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20200619050619.266888-1-leobras.c@gmail.com> References: <20200619050619.266888-1-leobras.c@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Platforms supporting the DDW option starting with LoPAR level 2.7 implement ibm,ddw-extensions. The first extension available (index 2) carries the token for ibm,reset-pe-dma-windows rtas call, which is used to restore the default DMA window for a device, if it has been deleted. It does so by resetting the TCE table allocation for the PE to it's boot time value, available in "ibm,dma-window" device tree node. Signed-off-by: Leonardo Bras --- arch/powerpc/platforms/pseries/iommu.c | 33 ++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c index e5a617738c8b..5e1fbc176a37 100644 --- a/arch/powerpc/platforms/pseries/iommu.c +++ b/arch/powerpc/platforms/pseries/iommu.c @@ -1012,6 +1012,39 @@ static phys_addr_t ddw_memory_hotplug_max(void) return max_addr; } +/* + * Platforms supporting the DDW option starting with LoPAR level 2.7 implement + * ibm,ddw-extensions, which carries the rtas token for + * ibm,reset-pe-dma-windows. + * That rtas-call can be used to restore the default DMA window for the device. + */ +static void reset_dma_window(struct pci_dev *dev, struct device_node *par_dn) +{ + int ret; + u32 cfg_addr, ddw_ext[3]; + u64 buid; + struct device_node *dn; + struct pci_dn *pdn; + + ret = of_property_read_u32_array(par_dn, "ibm,ddw-extensions", + &ddw_ext[0], 3); + if (ret) + return; + + dn = pci_device_to_OF_node(dev); + pdn = PCI_DN(dn); + buid = pdn->phb->buid; + cfg_addr = ((pdn->busno << 16) | (pdn->devfn << 8)); + + ret = rtas_call(ddw_ext[1], 3, 1, NULL, cfg_addr, + BUID_HI(buid), BUID_LO(buid)); + if (ret) + dev_info(&dev->dev, + "ibm,reset-pe-dma-windows(%x) %x %x %x returned %d ", + ddw_ext[1], cfg_addr, BUID_HI(buid), BUID_LO(buid), + ret); +} + /* * If the PE supports dynamic dma windows, and there is space for a table * that can map all pages in a linear offset, then setup such a table, -- 2.25.4