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From: Qian Cai <cai@lca.pw>
To: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Cc: f.fainelli@gmail.com, will@kernel.org, marc.zyngier@arm.com,
	catalin.marinas@arm.com, wahrenst@gmx.net,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	linux-mm@kvack.org, mbrugger@suse.com,
	linux-rpi-kernel@lists.infradead.org, phill@raspberrypi.org,
	Robin Murphy <Robin.Murphy@arm.com>,
	Christoph Hellwig <hch@lst.de>,
	linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com
Subject: Re: [PATCH v6 3/4] arm64: use both ZONE_DMA and ZONE_DMA32
Date: Mon, 21 Oct 2019 16:36:57 -0400
Message-ID: <AA6D37F1-A1B3-4EC4-8620-007095168BC7@lca.pw> (raw)
In-Reply-To: <9208de061fe2b9ee7b74206b3cd52cc116e43ac0.camel@suse.de>



> On Oct 21, 2019, at 1:55 PM, Nicolas Saenz Julienne <nsaenzjulienne@suse.de> wrote:
> 
> On Mon, 2019-10-21 at 13:25 -0400, Qian Cai wrote:
>>> On Oct 21, 2019, at 1:01 PM, Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
>>> wrote:
>>> 
>>> Could you enable CMA debugging to see if anything interesting comes out of
>>> it.
>> 
>> I did but nothing interesting came out. Did you use the same config I gave?
> 
> Yes, aside from enabling ZONE_DMA.
> 
>> Also, it has those cmdline.
>> 
>> page_poison=on page_owner=on numa_balancing=enable \
>> systemd.unified_cgroup_hierarchy=1 debug_guardpage_minorder=1 \
>> page_alloc.shuffle=1
> 
> No luck, still works for me even after adding those extra flags. IIRC most of
> them (if not all) are not even parsed by the time CMA is configured.
> 
> So, can you confirm the zones setup you're seeing is similar to this one:
> 
> [    0.000000][    T0] Zone ranges:
> [    0.000000][    T0]   DMA      [mem 0x00000000802f0000-0x00000000bfffffff]
> [    0.000000][    T0]   DMA32    [mem 0x00000000c0000000-0x00000000ffffffff]
> [    0.000000][    T0]   Normal   [mem 0x0000000100000000-0x00000093fcffffff]
> 
> Maybe your memory starts between 0xe0000000-0xffffffff. That would be
> problematic (although somewhat unwarranted).

I managed to get more information here,

[    0.000000] cma: dma_contiguous_reserve(limit c0000000)
[    0.000000] cma: dma_contiguous_reserve: reserving 64 MiB for global area
[    0.000000] cma: cma_declare_contiguous(size 0x0000000004000000, base 0x0000000000000000, limit 0x00000000c0000000 alignment 0x0000000000000000)
[    0.000000] cma: Failed to reserve 512 MiB

Full dmesg:

https://cailca.github.io/files/dmesg.txt
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Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-11 18:25 [PATCH v6 0/4] Raspberry Pi 4 DMA addressing support Nicolas Saenz Julienne
2019-09-11 18:25 ` [PATCH v6 1/4] arm64: mm: use arm64_dma_phys_limit instead of calling max_zone_dma_phys() Nicolas Saenz Julienne
2019-09-11 18:25 ` [PATCH v6 2/4] arm64: rename variables used to calculate ZONE_DMA32's size Nicolas Saenz Julienne
2019-09-11 18:25 ` [PATCH v6 3/4] arm64: use both ZONE_DMA and ZONE_DMA32 Nicolas Saenz Julienne
2019-10-21 14:15   ` Qian Cai
2019-10-21 14:34     ` Nicolas Saenz Julienne
2019-10-21 14:46       ` Qian Cai
2019-10-21 17:01         ` Nicolas Saenz Julienne
2019-10-21 17:25           ` Qian Cai
2019-10-21 17:55             ` Nicolas Saenz Julienne
2019-10-21 20:36               ` Qian Cai [this message]
2019-10-22 11:23                 ` Nicolas Saenz Julienne
2019-10-23  7:11                   ` Matthias Brugger
2019-10-31 15:51                   ` Catalin Marinas
2019-10-31 16:04                     ` Nicolas Saenz Julienne
2019-10-31 18:02                       ` Catalin Marinas
2019-10-31 18:11                         ` Nicolas Saenz Julienne
2019-10-31 18:13                           ` Catalin Marinas
2019-09-11 18:25 ` [PATCH v6 4/4] mm: refresh ZONE_DMA and ZONE_DMA32 comments in 'enum zone_type' Nicolas Saenz Julienne
2019-10-01 16:05 ` [PATCH v6 0/4] Raspberry Pi 4 DMA addressing support Catalin Marinas

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