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charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 25, 2021 at 1:18 PM Ard Biesheuvel wrote: > > On Tue, 25 May 2021 at 19:01, Peter Geis wrote: > > > > On Tue, May 25, 2021 at 12:44 PM Ard Biesheuvel wrote= : > > > > > > On Tue, 25 May 2021 at 18:23, Peter Geis wrote: > > > > > > > > On Tue, May 25, 2021 at 11:55 AM Ard Biesheuvel w= rote: > > > > > > > > > > On Tue, 25 May 2021 at 17:34, Peter Geis wr= ote: > > > > > > > > > > > > On Tue, May 25, 2021 at 9:57 AM Ard Biesheuvel wrote: > > > > > > > > > > > > > > On Tue, 25 May 2021 at 15:42, Punit Agrawal wrote: > > > > > > > > > > > > > > > > Hi Ard, > > > > > > > > > > > > > > > > Ard Biesheuvel writes: > > > > > > > > > > > > > > > > > On Sun, 23 May 2021 at 13:06, Punit Agrawal wrote: > > > > > > > > >> > > > > > > > > >> Robin Murphy writes: > > > > > > > > >> > > > > > > > > >> > [ +linux-pci for visibility ] > > > > > > > > >> > > > > > > > > > >> > On 2021-05-18 10:09, Alexandru Elisei wrote: > > > > > > > > >> >> After doing a git bisect I was able to trace the foll= owing error when booting my > > > > > > > > >> >> rockpro64 v2 (rk3399 SoC) with a PCIE NVME expansion = card: > > > > > > > > >> >> [..] > > > > > > > > >> >> [ 0.305183] rockchip-pcie f8000000.pcie: host brid= ge /pcie@f8000000 ranges: > > > > > > > > >> >> [ 0.305248] rockchip-pcie f8000000.pcie: MEM = 0x00fa000000..0x00fbdfffff -> > > > > > > > > >> >> 0x00fa000000 > > > > > > > > >> >> [ 0.305285] rockchip-pcie f8000000.pcie: IO = 0x00fbe00000..0x00fbefffff -> > > > > > > > > >> >> 0x00fbe00000 > > > > > > > > >> >> [ 0.306201] rockchip-pcie f8000000.pcie: supply vp= cie1v8 not found, using dummy > > > > > > > > >> >> regulator > > > > > > > > >> >> [ 0.306334] rockchip-pcie f8000000.pcie: supply vp= cie0v9 not found, using dummy > > > > > > > > >> >> regulator > > > > > > > > >> >> [ 0.373705] rockchip-pcie f8000000.pcie: PCI host = bridge to bus 0000:00 > > > > > > > > >> >> [ 0.373730] pci_bus 0000:00: root bus resource [bu= s 00-1f] > > > > > > > > >> >> [ 0.373751] pci_bus 0000:00: root bus resource [me= m 0xfa000000-0xfbdfffff 64bit] > > > > > > > > >> >> [ 0.373777] pci_bus 0000:00: root bus resource [io= 0x0000-0xfffff] (bus > > > > > > > > >> >> address [0xfbe00000-0xfbefffff]) > > > > > > > > >> >> [ 0.373839] pci 0000:00:00.0: [1d87:0100] type 01 = class 0x060400 > > > > > > > > >> >> [ 0.373973] pci 0000:00:00.0: supports D1 > > > > > > > > >> >> [ 0.373992] pci 0000:00:00.0: PME# supported from = D0 D1 D3hot > > > > > > > > >> >> [ 0.378518] pci 0000:00:00.0: bridge configuration= invalid ([bus 00-00]), > > > > > > > > >> >> reconfiguring > > > > > > > > >> >> [ 0.378765] pci 0000:01:00.0: [144d:a808] type 00 = class 0x010802 > > > > > > > > >> >> [ 0.378869] pci 0000:01:00.0: reg 0x10: [mem 0x000= 00000-0x00003fff 64bit] > > > > > > > > >> >> [ 0.379051] pci 0000:01:00.0: Max Payload Size set= to 256 (was 128, max 256) > > > > > > > > >> >> [ 0.379661] pci 0000:01:00.0: 8.000 Gb/s available= PCIe bandwidth, limited by > > > > > > > > >> >> 2.5 GT/s PCIe x4 link at 0000:00:00.0 (capable of 31.= 504 Gb/s with 8.0 GT/s PCIe > > > > > > > > >> >> x4 link) > > > > > > > > >> >> [ 0.393269] pci_bus 0000:01: busn_res: [bus 01-1f]= end is updated to 01 > > > > > > > > >> >> [ 0.393311] pci 0000:00:00.0: BAR 14: no space for= [mem size 0x00100000] > > > > > > > > >> >> [ 0.393333] pci 0000:00:00.0: BAR 14: failed to as= sign [mem size 0x00100000] > > > > > > > > >> >> [ 0.393356] pci 0000:01:00.0: BAR 0: no space for = [mem size 0x00004000 64bit] > > > > > > > > >> >> [ 0.393375] pci 0000:01:00.0: BAR 0: failed to ass= ign [mem size 0x00004000 64bit] > > > > > > > > >> >> [ 0.393397] pci 0000:00:00.0: PCI bridge to [bus 0= 1] > > > > > > > > >> >> [ 0.393839] pcieport 0000:00:00.0: PME: Signaling = with IRQ 78 > > > > > > > > >> >> [ 0.394165] pcieport 0000:00:00.0: AER: enabled wi= th IRQ 78 > > > > > > > > >> >> [..] > > > > > > > > >> >> to the commit 9d57e61bf723 ("of/pci: Add IORESOURCE_M= EM_64 to > > > > > > > > >> >> resource flags for > > > > > > > > >> >> 64-bit memory addresses"). > > > > > > > > >> > > > > > > > > > >> > FWFW, my hunch is that the host bridge advertising no = 32-bit memory > > > > > > > > >> > resource, only only a single 64-bit non-prefetchable o= ne (even though > > > > > > > > >> > it's entirely below 4GB) might be a bit weird and trip= ping something > > > > > > > > >> > up in the resource assignment code. It certainly seems= like the thing > > > > > > > > >> > most directly related to the offending commit. > > > > > > > > >> > > > > > > > > > >> > I'd be tempted to try fiddling with that in the DT (i.= e. changing > > > > > > > > >> > 0x83000000 to 0x82000000 in the PCIe node's "ranges" p= roperty) to see > > > > > > > > >> > if it makes any difference. Note that even if it helps= , though, I > > > > > > > > >> > don't know whether that's the correct fix or just a bo= dge around a > > > > > > > > >> > corner-case bug somewhere in the resource code. > > > > > > > > >> > > > > > > > > >> From digging into this further the failure seems to be d= ue to a mismatch > > > > > > > > >> of flags when allocating resources in pci_bus_alloc_from= _region() - > > > > > > > > >> > > > > > > > > >> if ((res->flags ^ r->flags) & type_mask) > > > > > > > > >> continue; > > > > > > > > >> > > > > > > > > >> Though I am also not sure why the failure is only being = reported on > > > > > > > > >> RK3399 - does a single 64-bit window have anything to do= with it? > > > > > > > > >> > > > > > > > > > > > > > > > > > > The NVMe in the example exposes a single 64-bit non-prefe= tchable BAR. > > > > > > > > > Such BARs can not be allocated in a prefetchable host bri= dge window > > > > > > > > > (unlike the converse, i.e., allocating a prefetchable BAR= in a > > > > > > > > > non-prefetchable host bridge window is fine) > > > > > > > > > > > > > > > > > > 64-bit non-prefetchable host bridge windows cannot be for= warded by PCI > > > > > > > > > to PCI bridges, they simply lack the BAR registers to des= cribe them. > > > > > > > > > Therefore, non-prefetchable endpoint BARs (even 64-bit on= es) need to > > > > > > > > > be carved out of a host bridge's non-prefetchable 32-bit = window if > > > > > > > > > they need to pass through a bridge. > > > > > > > > > > > > > > > > Thank you for the explanation. I also looked at the PCI-to-= PCI Bridge > > > > > > > > spec to understand where some of the limitations are coming= from. > > > > > > > > > > > > > > > > > So the error seems to be here that the host bridge's 32-b= it > > > > > > > > > non-prefetchable window has the 64-bit attribute set, eve= n though it > > > > > > > > > resides below 4 GB entirely. I suppose that the resource = allocation > > > > > > > > > could be made more forgiving (and it was in the past, bef= ore commit > > > > > > > > > 9d57e61bf723 was applied). However, I would strongly reco= mmend not > > > > > > > > > deviating from common practice, and just describe the 32-= bit > > > > > > > > > addressable non-prefetchable resource window as such. > > > > > > > > > > > > > > > > IIUC, the host bridge's configuration (64-bit on non-prefet= chable > > > > > > > > window) is based on what the hardware advertises. > > > > > > > > > > > > > > > > > > > > > > What do you mean by 'what the hardware advertises'? The host = bridge is > > > > > > > apparently configured to decode a 32-bit addressable window a= s MMIO, > > > > > > > and the question is why this window has the 64-bit attribute = set in > > > > > > > the DT description. > > > > > > > > > > > > > > > Can you elaborate on what you have in mind to correct the > > > > > > > > non-prefetchable resource window? Are you thinking of addin= g a quirk > > > > > > > > somewhere to address this? > > > > > > > > > > > > > > > > > > > > > > No. Just fix the DT. > > > > > > > > > > > > Good Morning, > > > > > > > > > > > > I believe Robin is correct that there is more to this. > > > > > > While attempting to work out why dGPUs won't work with the rk35= 6x > > > > > > series PCIe controllers, Christian K=C3=B6nig from the amd-gpu = driver > > > > > > mailing list noticed the gpu was incorrectly allocated a 64bit > > > > > > non-prefetchable BAR which should instead be a 32 non-prefetcha= ble > > > > > > BAR. > > > > > > > > > > > > > > > > This is due to the translation. For some reason, lspci translates= the > > > > > BAR values to CPU addresses, but the PCI side addresses are withi= n > > > > > 32-bits. > > > > > > > > The kernel log reports the same thing: > > > > [ 6.662141] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x0fffff= ff > > > > 64bit pref] > > > > [ 6.662963] pci 0000:01:00.0: reg 0x18: [mem 0x00000000-0x0001ff= ff 64bit] > > > > > > > > You are saying this is a display only issue? > > > > > > > > > > Yes. What do the 'root bus resource' log lines say for these regions? > > > Those should give you both the CPU address as well as the bus address= . > > > > [ 6.673497] pci_bus 0000:00: root bus resource [io 0x0000-0xfffff] > > (bus address [0x3f700000-0x3f7fffff]) > > [ 6.674642] pci_bus 0000:00: root bus resource [mem > > 0x300000000-0x33f6fffff] (bus address [0x00000000-0x3f6fffff]) > > > > I tweaked the original Rockchip values to place the non-prefetchable > > memory first with the configuration and io later in this boot. > > > > > > > > > > > > > > > > > > Are you sure the amdgpu driver can even deal with non-1:1 host br= idges? > > > > > > > > I cannot answer this as I'm not an amdgpu dev. > > > > > > > > > > > > > > > The ranges currently set are: > > > > > > ranges =3D <0x81000000 0x0 0x00800000 0x3 0x00800000 0x0 0x0010= 0000 > > > > > > 0x82000000 0x0 0x00900000 0x3 0x00900000 0x0 0x3f700000>; > > > > > > > > > > > > > > > > So you have two ranges here. > > > > > > > > The IO and PCI memory ranges. > > > > > > > > There is a third range, the configuration range, which is defined i= n > > > > the reg block: > > > > <0x3 0x00000000 0x0 0x800000> > > > > All three are shared in the same 1GB window on the rk356x. > > > > > > > > > > But the reg block is not a resource window, it is a configuration > > > range to program the host bridge. > > > > > > > https://elixir.bootlin.com/linux/v5.13-rc3/source/Documentation/dev= icetree/bindings/pci/designware-pcie.txt#L12 > > > > > > > > > > > > > > > but the final allocation was: > > > > > > > > > > > > lspci -v > > > > > > 00:00.0 PCI bridge: Fuzhou Rockchip Electronics Co., Ltd Device= 3566 > > > > > > (rev 01) (prog-if 00 [Normal decode]) > > > > > > Flags: bus master, fast devsel, latency 0, IRQ 96 > > > > > > Bus: primary=3D00, secondary=3D01, subordinate=3Dff, se= c-latency=3D0 > > > > > > I/O behind bridge: 00001000-00001fff [size=3D4K] > > > > > > Memory behind bridge: 00900000-009fffff [size=3D1M] > > > > > > Prefetchable memory behind bridge: > > > > > > 0000000010000000-000000001fffffff [size=3D256M] > > > > > > > > > > But the host bridge/root port decodes two disjoint regions?? > > > > > > > > > > > Expansion ROM at 300a00000 [virtual] [disabled] [size= =3D64K] > > > > > > Capabilities: [40] Power Management version 3 > > > > > > Capabilities: [50] MSI: Enable+ Count=3D1/32 Maskable- = 64bit+ > > > > > > Capabilities: [70] Express Root Port (Slot-), MSI 00 > > > > > > Capabilities: [b0] MSI-X: Enable- Count=3D1 Masked- > > > > > > Capabilities: [100] Advanced Error Reporting > > > > > > Capabilities: [148] Secondary PCI Express > > > > > > Capabilities: [160] L1 PM Substates > > > > > > Capabilities: [170] Vendor Specific Information: ID=3D0= 002 Rev=3D4 > > > > > > Len=3D100 > > > > > > Kernel driver in use: pcieport > > > > > > > > > > > > 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. > > > > > > [AMD/ATI] Turks PRO [Radeon HD 7570] (prog-if 00 [VGA controlle= r]) > > > > > > Subsystem: Dell Turks PRO [Radeon HD 7570] > > > > > > Flags: bus master, fast devsel, latency 0, IRQ 95 > > > > > > Memory at 310000000 (64-bit, prefetchable) [size=3D256M= ] > > > > > > Memory at 300900000 (64-bit, non-prefetchable) [size=3D= 128K] > > > > > > I/O ports at 1000 [size=3D256] > > > > > > Expansion ROM at 300920000 [disabled] [size=3D128K] > > > > > > Capabilities: [50] Power Management version 3 > > > > > > Capabilities: [58] Express Legacy Endpoint, MSI 00 > > > > > > Capabilities: [a0] MSI: Enable- Count=3D1/1 Maskable- 6= 4bit+ > > > > > > Capabilities: [100] Vendor Specific Information: ID=3D0= 001 Rev=3D1 > > > > > > Len=3D010 > > > > > > Capabilities: [150] Advanced Error Reporting > > > > > > Kernel driver in use: radeon > > > > > > > > > > > > 01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Tu= rks > > > > > > HDMI Audio [Radeon HD 6500/6600 / 6700M Series] > > > > > > Subsystem: Dell Turks HDMI Audio [Radeon HD 6500/6600 /= 6700M Series] > > > > > > Flags: bus master, fast devsel, latency 0, IRQ 98 > > > > > > Memory at 300940000 (64-bit, non-prefetchable) [size=3D= 16K] > > > > > > Capabilities: [50] Power Management version 3 > > > > > > Capabilities: [58] Express Legacy Endpoint, MSI 00 > > > > > > Capabilities: [a0] MSI: Enable+ Count=3D1/1 Maskable- 6= 4bit+ > > > > > > Capabilities: [100] Vendor Specific Information: ID=3D0= 001 Rev=3D1 > > > > > > Len=3D010 > > > > > > Capabilities: [150] Advanced Error Reporting > > > > > > Kernel driver in use: snd_hda_intel > > > > > > > > > > > > This will obviously clobber registers during writes. > > > > > > > > > > I don't follow. Which writes will clobber which registers, and ho= w is > > > > > it obvious? > > > > > > > > Writing a 64 bit word into a 32 bit register will either clobber th= e > > > > next higher 32 bit register. > > > > Quoting Christian: > > > > "When you program a 32bit BAR as 64bit you overwrite the register b= ehind > > > > the BAR address with the upper 32bits of the 64bit address value. > > > > So even if the allocation fits into 32bits, the extra register writ= e > > > > will certainly put your device into a banana state." > > > > > > > > https://lists.freedesktop.org/archives/amd-gfx/2021-May/064232.html > > > > > > > > > > I seriously doubt that this is what is going on here. > > > > > > lspci -x will give you the bare BAR values - I suspect that those are > > > probably fine. > > > > lspci -x > > 00:00.0 PCI bridge: Fuzhou Rockchip Electronics Co., Ltd Device 3566 (r= ev 01) > > 00: 87 1d 66 35 07 05 10 40 01 00 04 06 00 00 01 00 > > 10: 00 00 00 00 00 00 00 00 00 01 ff 00 10 10 00 20 > > 20: 00 10 00 10 01 00 f1 0f 00 00 00 00 00 00 00 00 > > 30: 00 00 00 00 40 00 00 00 00 00 00 00 5f 01 02 00 > > > > 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. > > [AMD/ATI] Turks PRO [Radeon HD 7570] > > 00: 02 10 5d 67 07 00 10 20 00 00 00 03 00 00 80 00 > > 10: 0c 00 00 00 00 00 00 00 > > This is a 64-bit prefetchable BAR programmed with bus address 0x0 > > > 04 00 00 10 00 00 00 00 > > This is a 64-bit non-prefetchable BAR programmed with bus address 0x1000_= 0000 According to the AMD mailing list, this is a problem, since it should be 32= -bit. > > (https://en.wikipedia.org/wiki/PCI_configuration_space describes the > meaning of the low order BAR bits) > > > 20: 01 10 70 3f 00 00 00 00 > > This looks odd. This looks like a 32-bit MMIO address poked into a I/O BA= R. Could this be because it's the only memory that is listed as 32-bit, since the IO space is forced as such? What are the implications of that? > > > > 00 00 00 00 28 10 20 2b > > 30: 00 00 02 10 50 00 00 00 00 00 00 00 5f 01 00 00 > > > > 01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Turks > > HDMI Audio [Radeon HD 6500/6600 / 6700M Series] > > 00: 02 10 90 aa 06 00 10 20 00 00 03 04 00 00 80 00 > > 10: 04 00 04 10 00 00 00 00 00 00 00 00 00 00 00 00 > > 20: 00 00 00 00 00 00 00 00 00 00 00 00 28 10 90 aa > > 30: 00 00 00 00 50 00 00 00 00 00 00 00 ff 02 00 00 > > > > > > > > > > > > > > > > > > > Also, if <0x82000000> (32 bit) is changed to <0x83000000> (64 b= it), > > > > > > most of the allocations for the dGPU fail due to no valid regio= ns > > > > > > available. > > > > > > > > > > > > > > > > But wasn't the original problem that the resource window was 64-b= it to > > > > > begin with? Are you sure we are talking about the same problem he= re? > > > > > > > > The rk3399 in the original report has a 32MB memory window in the > > > > upper end of the 4GB range. > > > > The rk356x has a similar layout, or it can use a 1GB window availab= le > > > > at <0x3 0x00000000>. > > > > Rockchip's default windows are defined as 64bit. > > > > > > > > The rk3399 doesn't have enough space to reasonably define two windo= ws, > > > > one 32bit, one 64bit, to work around an allocation bug. > > > > These are the defined regions in the rk3399: > > > > ranges =3D <0x83000000 0x0 0xfa000000 0x0 0xfa000000 0x0 0x1e00000>= , > > > > <0x81000000 0x0 0xfbe00000 0x0 0xfbe00000 0x0 0x100000>; > > > > > > > > > > All you really need is a 32-bit non-prefetchable resource window: any > > > BAR can be allocated from that. A 64-bit BAR can carry a 32-bit numbe= r > > > (just add zeroes at the top), and a prefetchable BAR can happily live > > > in a non-prefetchable window, with a theoretical performance impact i= f > > > the OS actually does use different memory attributes for the > > > prefetchable window (but I don't think Linux ever handles it this way= ) > > > > So is the IO range necessary as well or will it be automatically > > allocated as well? > > > > You need one I/O range and one 32-bit non-prefetchable MMIO window at > the very least, even though the I/O range is rarely used, even by > endpoints that expose I/O BARs. > > The translation is tricky to get right, and confuses some drivers, so > it is better avoided if possible. If you do need translation, make > sure to translate in the right direction. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > I am happy to put something together once I understand the = preferred way > > > > > > > > to go about it. > > > > > > > > > > > > > > > > Thanks, > > > > > > > > Punit > > > > > > > > > > > > > > > > [...] > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > > > > Linux-rockchip mailing list > > > > > > > Linux-rockchip@lists.infradead.org > > > > > > > http://lists.infradead.org/mailman/listinfo/linux-rockchip From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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-0400 Message-ID: Subject: Re: [BUG] rockpro64: PCI BAR reassignment broken by commit 9d57e61bf723 ("of/pci: Add IORESOURCE_MEM_64 to resource flags for 64-bit memory addresses") To: Ard Biesheuvel Cc: Punit Agrawal , Robin Murphy , Alexandru Elisei , Linux Kernel Mailing List , "open list:ARM/Rockchip SoC..." , arm-mail-list , Heiko Stuebner , Leonardo Bras , Rob Herring , PCI , =?UTF-8?Q?Christian_K=C3=B6nig?= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210525_103726_350514_01DA1E01 X-CRM114-Status: GOOD ( 54.17 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org 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IORESOURCE_MEM_64 to resource flags for 64-bit memory addresses") To: Ard Biesheuvel Cc: Punit Agrawal , Robin Murphy , Alexandru Elisei , Linux Kernel Mailing List , "open list:ARM/Rockchip SoC..." , arm-mail-list , Heiko Stuebner , Leonardo Bras , Rob Herring , PCI , =?UTF-8?Q?Christian_K=C3=B6nig?= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210525_103726_350514_01DA1E01 X-CRM114-Status: GOOD ( 54.17 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVHVlLCBNYXkgMjUsIDIwMjEgYXQgMToxOCBQTSBBcmQgQmllc2hldXZlbCA8YXJkYkBrZXJu ZWwub3JnPiB3cm90ZToKPgo+IE9uIFR1ZSwgMjUgTWF5IDIwMjEgYXQgMTk6MDEsIFBldGVyIEdl 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