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[124.171.83.152]) by smtp.gmail.com with ESMTPSA id ev20sm12693732pjb.8.2020.06.22.03.02.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 22 Jun 2020 03:02:16 -0700 (PDT) Subject: Re: [PATCH 1/4] powerpc/pseries/iommu: Update call to ibm,query-pe-dma-windows To: Leonardo Bras Cc: Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Thiago Jung Bauermann , Ram Pai , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org References: <20200619050619.266888-1-leobras.c@gmail.com> <20200619050619.266888-2-leobras.c@gmail.com> From: Alexey Kardashevskiy Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR tfLAeVpslNfWCi5ybPlowLx6KJqOsI9R2a9o4qRXWGP7IwiMRAC3iiPyk9cknt8ee6EUIxI6 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DG9EMkK8IBXnLulqVk54kf7fE0jT/d8RTtJIA92GzsgdK2rpT1MBKKVffjRFGwN7nQVOzi4T XrB5p+6ML7Bd84xOEGsj/vdaXmz1esuH7BOZAGEZfLRCHJ0GVCSssg== Message-ID: Date: Mon, 22 Jun 2020 20:02:11 +1000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200619050619.266888-2-leobras.c@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 19/06/2020 15:06, Leonardo Bras wrote: > From LoPAR level 2.8, "ibm,ddw-extensions" index 3 can make the number of > outputs from "ibm,query-pe-dma-windows" go from 5 to 6. > > This change of output size is meant to expand the address size of > largest_available_block PE TCE from 32-bit to 64-bit, which ends up > shifting page_size and migration_capable. > > This ends up requiring the update of > ddw_query_response->largest_available_block from u32 to u64, and manually > assigning the values from the buffer into this struct, according to > output size. > > Signed-off-by: Leonardo Bras > --- > arch/powerpc/platforms/pseries/iommu.c | 57 +++++++++++++++++++++----- > 1 file changed, 46 insertions(+), 11 deletions(-) > > diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c > index 6d47b4a3ce39..e5a617738c8b 100644 > --- a/arch/powerpc/platforms/pseries/iommu.c > +++ b/arch/powerpc/platforms/pseries/iommu.c > @@ -334,7 +334,7 @@ struct direct_window { > /* Dynamic DMA Window support */ > struct ddw_query_response { > u32 windows_available; > - u32 largest_available_block; > + u64 largest_available_block; > u32 page_size; > u32 migration_capable; > }; > @@ -869,14 +869,32 @@ static int find_existing_ddw_windows(void) > } > machine_arch_initcall(pseries, find_existing_ddw_windows); > > +/* > + * From LoPAR level 2.8, "ibm,ddw-extensions" index 3 can rule how many output > + * parameters ibm,query-pe-dma-windows will have, ranging from 5 to 6. > + */ > + > +static int query_ddw_out_sz(struct device_node *par_dn) Can easily be folded into query_ddw(). > +{ > + int ret; > + u32 ddw_ext[3]; > + > + ret = of_property_read_u32_array(par_dn, "ibm,ddw-extensions", > + &ddw_ext[0], 3); > + if (ret || ddw_ext[0] < 2 || ddw_ext[2] != 1) Oh that PAPR thing again :-/ === The “ibm,ddw-extensions” property value is a list of integers the first integer indicates the number of extensions implemented and subsequent integers, one per extension, provide a value associated with that extension. === So ddw_ext[0] is length. Listindex==2 is for "reset" says PAPR and Listindex==3 is for this new 64bit "largest_available_block". So I'd expect ddw_ext[2] to have the "reset" token and ddw_ext[3] to have "1" for this new feature but indexes are smaller. I am confused. Either way these "2" and "3" needs to be defined in macros, "0" probably too. Please post 'lsprop "ibm,ddw-extensions"' here. Thanks, > + return 5; > + return 6; > +} > + > static int query_ddw(struct pci_dev *dev, const u32 *ddw_avail, > - struct ddw_query_response *query) > + struct ddw_query_response *query, > + struct device_node *par_dn) > { > struct device_node *dn; > struct pci_dn *pdn; > - u32 cfg_addr; > + u32 cfg_addr, query_out[5]; > u64 buid; > - int ret; > + int ret, out_sz; > > /* > * Get the config address and phb buid of the PE window. > @@ -888,12 +906,29 @@ static int query_ddw(struct pci_dev *dev, const u32 *ddw_avail, > pdn = PCI_DN(dn); > buid = pdn->phb->buid; > cfg_addr = ((pdn->busno << 16) | (pdn->devfn << 8)); > + out_sz = query_ddw_out_sz(par_dn); > + > + ret = rtas_call(ddw_avail[0], 3, out_sz, query_out, > + cfg_addr, BUID_HI(buid), BUID_LO(buid)); > + dev_info(&dev->dev, "ibm,query-pe-dma-windows(%x) %x %x %x returned %d\n", > + ddw_avail[0], cfg_addr, BUID_HI(buid), BUID_LO(buid), ret); > + > + switch (out_sz) { > + case 5: > + query->windows_available = query_out[0]; > + query->largest_available_block = query_out[1]; > + query->page_size = query_out[2]; > + query->migration_capable = query_out[3]; > + break; > + case 6: > + query->windows_available = query_out[0]; > + query->largest_available_block = ((u64)query_out[1] << 32) | > + query_out[2]; > + query->page_size = query_out[3]; > + query->migration_capable = query_out[4]; > + break; > + } > > - ret = rtas_call(ddw_avail[0], 3, 5, (u32 *)query, > - cfg_addr, BUID_HI(buid), BUID_LO(buid)); > - dev_info(&dev->dev, "ibm,query-pe-dma-windows(%x) %x %x %x" > - " returned %d\n", ddw_avail[0], cfg_addr, BUID_HI(buid), > - BUID_LO(buid), ret); > return ret; > } > > @@ -1040,7 +1075,7 @@ static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn) > * of page sizes: supported and supported for migrate-dma. > */ > dn = pci_device_to_OF_node(dev); > - ret = query_ddw(dev, ddw_avail, &query); > + ret = query_ddw(dev, ddw_avail, &query, pdn); > if (ret != 0) > goto out_failed; > > @@ -1068,7 +1103,7 @@ static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn) > /* check largest block * page size > max memory hotplug addr */ > max_addr = ddw_memory_hotplug_max(); > if (query.largest_available_block < (max_addr >> page_shift)) { > - dev_dbg(&dev->dev, "can't map partition max 0x%llx with %u " > + dev_dbg(&dev->dev, "can't map partition max 0x%llx with %llu " > "%llu-sized pages\n", max_addr, query.largest_available_block, > 1ULL << page_shift); > goto out_failed; > -- Alexey