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Wed, 21 Apr 2021 07:34:02 -0700 (PDT) Subject: Re: [v5.4 stable] arm: stm32: Regression observed on "no-map" reserved memory region To: Quentin Perret Cc: Ard Biesheuvel , Rob Herring , Alexandre TORGUE , Greg Kroah-Hartman , Sasha Levin , stable , Arnd Bergmann , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , "linux-kernel@vger.kernel.org" , Nicolas Boichat , Stephen Boyd , KarimAllah Ahmed , Android Kernel Team , Architecture Mailman List , Frank Rowand , linux-arm-kernel References: <4a4734d6-49df-677b-71d3-b926c44d89a9@foss.st.com> <001f8550-b625-17d2-85a6-98a483557c70@foss.st.com> From: Florian Fainelli Message-ID: Date: Wed, 21 Apr 2021 07:33:52 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0 Thunderbird/78.9.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210421_073408_327863_0F5D0A33 X-CRM114-Status: GOOD ( 29.03 ) 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="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 4/21/2021 1:31 AM, Quentin Perret wrote: > On Tuesday 20 Apr 2021 at 09:33:56 (-0700), Florian Fainelli wrote: >> I do wonder as well, we have a 32MB "no-map" reserved memory region on >> our platforms located at 0xfe000000. Without the offending commit, >> /proc/iomem looks like this: >> >> 40000000-fdffefff : System RAM >> 40008000-40ffffff : Kernel code >> 41e00000-41ef1d77 : Kernel data >> 100000000-13fffffff : System RAM >> >> and with the patch applied, we have this: >> >> 40000000-fdffefff : System RAM >> 40008000-40ffffff : Kernel code >> 41e00000-41ef3db7 : Kernel data >> fdfff000-ffffffff : System RAM >> 100000000-13fffffff : System RAM >> >> so we can now see that the region 0xfe000000 - 0xfffffff is also cobbled >> up with the preceding region which is a mailbox between Linux and the >> secure monitor at 0xfdfff000 and of size 4KB. It seems like there is >> >> The memblock=debug outputs is also different: >> >> [ 0.000000] MEMBLOCK configuration: >> [ 0.000000] memory size = 0xfdfff000 reserved size = 0x7ce4d20d >> [ 0.000000] memory.cnt = 0x2 >> [ 0.000000] memory[0x0] [0x00000040000000-0x000000fdffefff], >> 0xbdfff000 bytes flags: 0x0 >> [ 0.000000] memory[0x1] [0x00000100000000-0x0000013fffffff], >> 0x40000000 bytes flags: 0x0 >> [ 0.000000] reserved.cnt = 0x6 >> [ 0.000000] reserved[0x0] [0x00000040003000-0x0000004000e494], >> 0xb495 bytes flags: 0x0 >> [ 0.000000] reserved[0x1] [0x00000040200000-0x00000041ef1d77], >> 0x1cf1d78 bytes flags: 0x0 >> [ 0.000000] reserved[0x2] [0x00000045000000-0x000000450fffff], >> 0x100000 bytes flags: 0x0 >> [ 0.000000] reserved[0x3] [0x00000047000000-0x0000004704ffff], >> 0x50000 bytes flags: 0x0 >> [ 0.000000] reserved[0x4] [0x000000c2c00000-0x000000fdbfffff], >> 0x3b000000 bytes flags: 0x0 >> [ 0.000000] reserved[0x5] [0x00000100000000-0x0000013fffffff], >> 0x40000000 bytes flags: 0x0 >> >> [ 0.000000] MEMBLOCK configuration: >> [ 0.000000] memory size = 0x100000000 reserved size = 0x7ca4f24d >> [ 0.000000] memory.cnt = 0x3 >> [ 0.000000] memory[0x0] [0x00000040000000-0x000000fdffefff], >> 0xbdfff000 bytes flags: 0x0 >> [ 0.000000] memory[0x1] [0x000000fdfff000-0x000000ffffffff], >> 0x2001000 bytes flags: 0x4 >> [ 0.000000] memory[0x2] [0x00000100000000-0x0000013fffffff], >> 0x40000000 bytes flags: 0x0 >> [ 0.000000] reserved.cnt = 0x6 >> [ 0.000000] reserved[0x0] [0x00000040003000-0x0000004000e494], >> 0xb495 bytes flags: 0x0 >> [ 0.000000] reserved[0x1] [0x00000040200000-0x00000041ef3db7], >> 0x1cf3db8 bytes flags: 0x0 >> [ 0.000000] reserved[0x2] [0x00000045000000-0x000000450fffff], >> 0x100000 bytes flags: 0x0 >> [ 0.000000] reserved[0x3] [0x00000047000000-0x0000004704ffff], >> 0x50000 bytes flags: 0x0 >> [ 0.000000] reserved[0x4] [0x000000c3000000-0x000000fdbfffff], >> 0x3ac00000 bytes flags: 0x0 >> [ 0.000000] reserved[0x5] [0x00000100000000-0x0000013fffffff], >> 0x40000000 bytes flags: 0x0 >> >> in the second case we can clearly see that the 32MB no-map region is now >> considered as usable RAM. >> >> Hope this helps. >> >>> >>> In any case, the mere fact that this causes a regression should be >>> sufficient justification to revert/withdraw it from v5.4, as I don't >>> see a reason why it was merged there in the first place. (It has no >>> fixes tag or cc:stable) >> >> Agreed, however that means we still need to find out whether a more >> recent kernel is also broken, I should be able to tell you that a little >> later. > > FWIW I did test this on Qemu before posting. With 5.12-rc8 and a 1MiB > no-map region at 0x80000000, I have the following: > > 40000000-7fffffff : System RAM > 40210000-417fffff : Kernel code > 41800000-41daffff : reserved > 41db0000-4210ffff : Kernel data > 48000000-48008fff : reserved > 80000000-800fffff : reserved > 80100000-13fffffff : System RAM > fa000000-ffffffff : reserved > 13b000000-13f5fffff : reserved > 13f6de000-13f77dfff : reserved > 13f77e000-13f77efff : reserved > 13f77f000-13f7dafff : reserved > 13f7dd000-13f7defff : reserved > 13f7df000-13f7dffff : reserved > 13f7e0000-13f7f3fff : reserved > 13f7f4000-13f7fdfff : reserved > 13f7fe000-13fffffff : reserved > > If I remove the 'no-map' qualifier from DT, I get this: > > 40000000-13fffffff : System RAM > 40210000-417fffff : Kernel code > 41800000-41daffff : reserved > 41db0000-4210ffff : Kernel data > 48000000-48008fff : reserved > 80000000-800fffff : reserved > fa000000-ffffffff : reserved > 13b000000-13f5fffff : reserved > 13f6de000-13f77dfff : reserved > 13f77e000-13f77efff : reserved > 13f77f000-13f7dafff : reserved > 13f7dd000-13f7defff : reserved > 13f7df000-13f7dffff : reserved > 13f7e0000-13f7f3fff : reserved > 13f7f4000-13f7fdfff : reserved > 13f7fe000-13fffffff : reserved > > So this does seem to be working fine on my setup. I'll try again with > 5.4 to see if I can repro. > > Also, 8a5a75e5e9e5 ("of/fdt: Make sure no-map does not remove already > reserved regions") looks more likely to cause the issue observed here, > but that shouldn't be silent. I get the following error message in dmesg > if I if place the no-map region on top of the kernel image: > > OF: fdt: Reserved memory: failed to reserve memory for node 'foobar@40210000': base 0x0000000040210000, size 1 MiB > > Is that triggering on your end? It is not, otherwise I would have noticed earlier, can you try the same thing that happens on my platform with a reserved region (without no-map) adjacent to a reserved region with 'no-map'? I will test different and newer kernels than 5.4 today to find out if this is still a problem with upstream. I could confirm that v4.9.259 also have this problem now. -- Florian _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel