From: Mike Rapoport <rppt@linux.ibm.com>
To: Christoph Hellwig <hch@lst.de>
Cc: linux-arch@vger.kernel.org, darren@stevens-zone.net,
rtd2@xtra.co.nz, linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
iommu@lists.linux-foundation.org,
Rob Herring <robh+dt@kernel.org>,
paulus@samba.org, mad skateman <madskateman@gmail.com>,
Christian Zigotzky <chzigotzky@xenosoft.de>,
"contact@a-eon.com" <contact@a-eon.com>,
Robin Murphy <robin.murphy@arm.com>,
nsaenzjulienne@suse.de
Subject: Re: Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI board installed, unless RAM size limited to 3500M
Date: Mon, 25 Nov 2019 11:32:00 +0200 [thread overview]
Message-ID: <20191125093159.GA23118@linux.ibm.com> (raw)
In-Reply-To: <20191125073923.GA30168@lst.de>
On Mon, Nov 25, 2019 at 08:39:23AM +0100, Christoph Hellwig wrote:
> On Sat, Nov 23, 2019 at 12:42:27PM +0100, Christian Zigotzky wrote:
> > Hello Christoph,
> >
> > Please find attached the dmesg of your Git kernel.
>
> Thanks. It looks like on your platform the swiotlb buffer isn't
> actually addressable based on the bus dma mask limit, which is rather
> interesting. swiotlb_init uses memblock_alloc_low to allocate the
> buffer, and I'll need some help from Mike and the powerpc maintainers
> to figure out how that select where to allocate the buffer from, and
> how we can move it to a lower address. My gut feeling would be to try
> to do what arm64 does and define a new ARCH_LOW_ADDRESS_LIMIT, preferably
> without needing too much arch specific magic.
Presuming the problem is relevant for all CoreNet boards something like
this could work:
diff --git a/arch/powerpc/include/asm/dma.h b/arch/powerpc/include/asm/dma.h
index 1b4f0254868f..7c6cfeeaff52 100644
--- a/arch/powerpc/include/asm/dma.h
+++ b/arch/powerpc/include/asm/dma.h
@@ -347,5 +347,11 @@ extern int isa_dma_bridge_buggy;
#define isa_dma_bridge_buggy (0)
#endif
+#ifdef CONFIG_CORENET_GENERIC
+extern phys_addr_t ppc_dma_phys_limit;
+#define ARCH_LOW_ADDRESS_LIMIT (ppc_dma_phys_limit - 1)
+#endif
+
+
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_DMA_H */
diff --git a/arch/powerpc/platforms/85xx/common.c b/arch/powerpc/platforms/85xx/common.c
index fe0606439b5a..346b436b6d3f 100644
--- a/arch/powerpc/platforms/85xx/common.c
+++ b/arch/powerpc/platforms/85xx/common.c
@@ -126,3 +126,7 @@ void __init mpc85xx_qe_par_io_init(void)
}
}
#endif
+
+#ifdef CONFIG_CORENET_GENERIC
+phys_addr_t ppc_dma_phys_limit = 0xffffffffUL;
+#endif
diff --git a/arch/powerpc/platforms/85xx/corenet_generic.c b/arch/powerpc/platforms/85xx/corenet_generic.c
index 7ee2c6628f64..673bcbdc7c75 100644
--- a/arch/powerpc/platforms/85xx/corenet_generic.c
+++ b/arch/powerpc/platforms/85xx/corenet_generic.c
@@ -64,7 +64,7 @@ void __init corenet_gen_setup_arch(void)
mpc85xx_smp_init();
swiotlb_detect_4g();
-
+ ppc_dma_phys_limit = 0x0fffffffUL;
pr_info("%s board\n", ppc_md.name);
mpc85xx_qe_init();
> As a quick hack can you try this patch on top of the tree from Friday?
>
> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
> index f491690d54c6..e3f95c362922 100644
> --- a/include/linux/memblock.h
> +++ b/include/linux/memblock.h
> @@ -344,7 +344,7 @@ static inline int memblock_get_region_node(const struct memblock_region *r)
> #define MEMBLOCK_LOW_LIMIT 0
>
> #ifndef ARCH_LOW_ADDRESS_LIMIT
> -#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
> +#define ARCH_LOW_ADDRESS_LIMIT 0x0fffffffUL
> #endif
>
> phys_addr_t memblock_phys_alloc_range(phys_addr_t size, phys_addr_t align,
--
Sincerely yours,
Mike.
next prev parent reply other threads:[~2019-11-25 9:34 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-16 7:06 Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI board installed, unless RAM size limited to 3500M Christian Zigotzky
2019-11-21 7:29 ` Christoph Hellwig
2019-11-21 12:16 ` Christian Zigotzky
2019-11-21 12:21 ` Christian Zigotzky
2019-11-21 13:33 ` Robin Murphy
2019-11-21 16:34 ` Christian Zigotzky
2019-11-21 18:02 ` Christoph Hellwig
2019-11-21 18:21 ` Christian Zigotzky
2019-11-23 11:42 ` Christian Zigotzky
2019-11-25 7:39 ` Christoph Hellwig
2019-11-25 9:32 ` Mike Rapoport [this message]
2019-11-25 16:38 ` Christian Zigotzky
2019-11-26 11:57 ` Christian Zigotzky
2019-11-25 16:36 ` Christian Zigotzky
2019-11-26 11:26 ` Christian Zigotzky
2019-11-26 16:40 ` Christoph Hellwig
2019-11-27 6:56 ` Mike Rapoport
2019-11-27 8:53 ` Christoph Hellwig
2019-11-27 15:14 ` Christian Zigotzky
2019-12-04 8:56 ` Christoph Hellwig
2019-12-04 12:22 ` Christian Zigotzky
2020-01-10 7:10 ` Christian Zigotzky
2020-01-15 15:18 ` Christoph Hellwig
-- strict thread matches above, loose matches on Subject: below --
2019-10-29 4:49 Christian Zigotzky
2019-10-30 0:10 ` Christian Zigotzky
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