From: Christian Zigotzky <chzigotzky@xenosoft.de>
To: Christoph Hellwig <hch@lst.de>
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, iommu@lists.linux-foundation.org,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
paulus@samba.org, darren@stevens-zone.net,
"contact@a-eon.com" <contact@a-eon.com>,
rtd2@xtra.co.nz, mad skateman <madskateman@gmail.com>,
Rob Herring <robh+dt@kernel.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: Re: Bug 205201 - overflow of DMA mask and bus mask
Date: Mon, 11 Nov 2019 09:16:55 +0100 [thread overview]
Message-ID: <0c5a8009-d28b-601f-3d1a-9de0e869911c@xenosoft.de> (raw)
In-Reply-To: <af32bfcc-5559-578d-e1f4-75e454c965bf@xenosoft.de>
On 11 November 2019 at 09:12 am, Christian Zigotzky wrote:
> On 10 November 2019 at 08:27 am, Christian Zigotzky wrote:
>> On 07 November 2019 at 10:53 am, Christian Zigotzky wrote:
>>> On 05 November 2019 at 05:28 pm, Christoph Hellwig wrote:
>>>> On Tue, Nov 05, 2019 at 08:56:27AM +0100, Christian Zigotzky wrote:
>>>>> Hi All,
>>>>>
>>>>> We still have DMA problems with some PCI devices. Since the
>>>>> PowerPC updates
>>>>> 4.21-1 [1] we need to decrease the RAM to 3500MB (mem=3500M) if we
>>>>> want to
>>>>> work with our PCI devices. The FSL P5020 and P5040 have these
>>>>> problems
>>>>> currently.
>>>>>
>>>>> Error message:
>>>>>
>>>>> [ 25.654852] bttv 1000:04:05.0: overflow 0x00000000fe077000+4096
>>>>> of DMA
>>>>> mask ffffffff bus mask df000000
>>>>>
>>>>> All 5.x Linux kernels can't initialize a SCSI PCI card anymore so
>>>>> booting
>>>>> of a Linux userland isn't possible.
>>>>>
>>>>> PLEASE check the DMA changes in the PowerPC updates 4.21-1 [1].
>>>>> The kernel
>>>>> 4.20 works with all PCI devices without limitation of RAM.
>>>> Can you send me the .config and a dmesg? And in the meantime try the
>>>> patch below?
>>>>
>>>> ---
>>>> >From 4d659b7311bd4141fdd3eeeb80fa2d7602ea01d4 Mon Sep 17 00:00:00
>>>> 2001
>>>> From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
>>>> Date: Fri, 18 Oct 2019 13:00:43 +0200
>>>> Subject: dma-direct: check for overflows on 32 bit DMA addresses
>>>>
>>>> As seen on the new Raspberry Pi 4 and sta2x11's DMA implementation
>>>> it is
>>>> possible for a device configured with 32 bit DMA addresses and a
>>>> partial
>>>> DMA mapping located at the end of the address space to overflow. It
>>>> happens when a higher physical address, not DMAable, is translated to
>>>> it's DMA counterpart.
>>>>
>>>> For example the Raspberry Pi 4, configurable up to 4 GB of memory, has
>>>> an interconnect capable of addressing the lower 1 GB of physical
>>>> memory
>>>> with a DMA offset of 0xc0000000. It transpires that, any attempt to
>>>> translate physical addresses higher than the first GB will result
>>>> in an
>>>> overflow which dma_capable() can't detect as it only checks for
>>>> addresses bigger then the maximum allowed DMA address.
>>>>
>>>> Fix this by verifying in dma_capable() if the DMA address range
>>>> provided
>>>> is at any point lower than the minimum possible DMA address on the
>>>> bus.
>>>>
>>>> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
>>>> ---
>>>> include/linux/dma-direct.h | 8 ++++++++
>>>> 1 file changed, 8 insertions(+)
>>>>
>>>> diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
>>>> index adf993a3bd58..6ad9e9ea7564 100644
>>>> --- a/include/linux/dma-direct.h
>>>> +++ b/include/linux/dma-direct.h
>>>> @@ -3,6 +3,7 @@
>>>> #define _LINUX_DMA_DIRECT_H 1
>>>> #include <linux/dma-mapping.h>
>>>> +#include <linux/memblock.h> /* for min_low_pfn */
>>>> #include <linux/mem_encrypt.h>
>>>> #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
>>>> @@ -27,6 +28,13 @@ static inline bool dma_capable(struct device
>>>> *dev, dma_addr_t addr, size_t size)
>>>> if (!dev->dma_mask)
>>>> return false;
>>>> +#ifndef CONFIG_ARCH_DMA_ADDR_T_64BIT
>>>> + /* Check if DMA address overflowed */
>>>> + if (min(addr, addr + size - 1) <
>>>> + __phys_to_dma(dev, (phys_addr_t)(min_low_pfn << PAGE_SHIFT)))
>>>> + return false;
>>>> +#endif
>>>> +
>>>> return addr + size - 1 <=
>>>> min_not_zero(*dev->dma_mask, dev->bus_dma_mask);
>>>> }
>>> Hello Christoph,
>>>
>>> Thanks a lot for your patch! Unfortunately this patch doesn't solve
>>> the issue.
>>>
>>> Error messages:
>>>
>>> [ 6.041163] bttv: driver version 0.9.19 loaded
>>> [ 6.041167] bttv: using 8 buffers with 2080k (520 pages) each for
>>> capture
>>> [ 6.041559] bttv: Bt8xx card found (0)
>>> [ 6.041609] bttv: 0: Bt878 (rev 17) at 1000:04:05.0, irq: 19,
>>> latency: 128, mmio: 0xc20001000
>>> [ 6.041622] bttv: 0: using: Typhoon TView RDS + FM Stereo / KNC1
>>> TV Station RDS [card=53,insmod option]
>>> [ 6.042216] bttv: 0: tuner type=5
>>> [ 6.111994] bttv: 0: audio absent, no audio device found!
>>> [ 6.176425] bttv: 0: Setting PLL: 28636363 => 35468950 (needs up
>>> to 100ms)
>>> [ 6.200005] bttv: PLL set ok
>>> [ 6.209351] bttv: 0: registered device video0
>>> [ 6.211576] bttv: 0: registered device vbi0
>>> [ 6.214897] bttv: 0: registered device radio0
>>> [ 114.218806] bttv 1000:04:05.0: overflow 0x00000000ff507000+4096
>>> of DMA mask ffffffff bus mask df000000
>>> [ 114.218848] Modules linked in: rfcomm bnep tuner_simple
>>> tuner_types tea5767 tuner tda7432 tvaudio msp3400 bttv tea575x
>>> tveeprom videobuf_dma_sg videobuf_core rc_core videodev mc btusb
>>> btrtl btbcm btintel bluetooth uio_pdrv_genirq uio ecdh_generic ecc
>>> [ 114.219012] [c0000001ecddf720] [80000000008ff6e8]
>>> .buffer_prepare+0x150/0x268 [bttv]
>>> [ 114.219029] [c0000001ecddf860] [80000000008fff6c]
>>> .bttv_qbuf+0x50/0x64 [bttv]
>>>
>>> -----
>>>
>>> Trace:
>>>
>>> [ 462.783184] Call Trace:
>>> [ 462.783187] [c0000001c6c67420] [c0000000000b3358]
>>> .report_addr+0xb8/0xc0 (unreliable)
>>> [ 462.783192] [c0000001c6c67490] [c0000000000b351c]
>>> .dma_direct_map_page+0xf0/0x128
>>> [ 462.783195] [c0000001c6c67530] [c0000000000b35b0]
>>> .dma_direct_map_sg+0x5c/0xac
>>> [ 462.783205] [c0000001c6c675e0] [8000000000862e88]
>>> .__videobuf_iolock+0x660/0x6d8 [videobuf_dma_sg]
>>> [ 462.783220] [c0000001c6c676b0] [8000000000854274]
>>> .videobuf_iolock+0x98/0xb4 [videobuf_core]
>>> [ 462.783271] [c0000001c6c67720] [80000000008686e8]
>>> .buffer_prepare+0x150/0x268 [bttv]
>>> [ 462.783276] [c0000001c6c677c0] [8000000000854afc]
>>> .videobuf_qbuf+0x2b8/0x428 [videobuf_core]
>>> [ 462.783288] [c0000001c6c67860] [8000000000868f6c]
>>> .bttv_qbuf+0x50/0x64 [bttv]
>>> [ 462.783383] [c0000001c6c678e0] [80000000007bf208]
>>> .v4l_qbuf+0x54/0x60 [videodev]
>>> [ 462.783402] [c0000001c6c67970] [80000000007c1eac]
>>> .__video_do_ioctl+0x30c/0x3f8 [videodev]
>>> [ 462.783421] [c0000001c6c67a80] [80000000007c3c08]
>>> .video_usercopy+0x18c/0x3dc [videodev]
>>> [ 462.783440] [c0000001c6c67c00] [80000000007bb14c]
>>> .v4l2_ioctl+0x60/0x78 [videodev]
>>> [ 462.783460] [c0000001c6c67c90] [80000000007d3c48]
>>> .v4l2_compat_ioctl32+0x9b4/0x1850 [videodev]
>>> [ 462.783468] [c0000001c6c67d70] [c0000000001ad9cc]
>>> .__se_compat_sys_ioctl+0x284/0x127c
>>> [ 462.783473] [c0000001c6c67e20] [c00000000000067c]
>>> system_call+0x60/0x6c
>>> [ 462.783475] Instruction dump:
>>> [ 462.783477] 40fe0044 60000000 892255d0 2f890000 40fe0020 3c82ffc5
>>> 39200001 60000000
>>> [ 462.783483] 38842029 992255d0 485ad0d9 60000000 <0fe00000>
>>> 38210070 e8010010 7c0803a6
>>> [ 462.783490] ---[ end trace b677d4a00458e277 ]---
>>>
>>> -----
>>>
>>> dmesg fsl p5040: https://bugzilla.kernel.org/attachment.cgi?id=285813
>>>
>>> Kernel 5.4-rc6 config for the Cyrus+ board and for the QEMU ppce500
>>> board (CPU: P5040 and P5020):
>>> https://bugzilla.kernel.org/attachment.cgi?id=285815
>>>
>>> Bug report: https://bugzilla.kernel.org/show_bug.cgi?id=205201
>>>
>>> Thanks for your help,
>>>
>>> Christian
>>
>> Christoph,
>>
>> Do you have another patch for testing or shall I bisect?
>>
>> Thanks,
>> Christian
>
> Hi Christoph,
>
> I have seen that I have activated the kernel config option
> CONFIG_ARCH_DMA_ADDR_T_64BIT. That means your code in your patch won't
> work if this kernel option is enabled.
>
> +#ifndef CONFIG_ARCH_DMA_ADDR_T_64BIT
> + /* Check if DMA address overflowed */
> + if (min(addr, addr + size - 1) <
> + __phys_to_dma(dev, (phys_addr_t)(min_low_pfn << PAGE_SHIFT)))
> + return false;
> +#endif
>
> I will delete the lines with ifndef and endif and will try it again.
>
> Cheers,
> Christian
Christoph,
I have seen that the patch above isn't from you. It's from Nicolas Saenz
Julienne.
Cheers,
Christian
next prev parent reply other threads:[~2019-11-11 8:17 UTC|newest]
Thread overview: 181+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-14 8:22 use generic DMA mapping code in powerpc V4 Christoph Hellwig
2018-11-14 8:22 ` [PATCH 01/34] powerpc: use mm zones more sensibly Christoph Hellwig
2018-12-06 14:09 ` Christoph Hellwig
2018-12-07 12:18 ` Michael Ellerman
2018-12-07 14:09 ` Christoph Hellwig
2018-12-07 15:04 ` Christian Zigotzky
2018-11-14 8:22 ` [PATCH 02/34] powerpc: allow NOT_COHERENT_CACHE for amigaone Christoph Hellwig
2018-12-06 14:09 ` Christoph Hellwig
2018-11-14 8:22 ` [PATCH 03/34] powerpc/dma: remove the unused ARCH_HAS_DMA_MMAP_COHERENT define Christoph Hellwig
2018-12-06 14:09 ` Christoph Hellwig
2018-11-14 8:22 ` [PATCH 04/34] powerpc/dma: remove the unused ISA_DMA_THRESHOLD export Christoph Hellwig
2018-12-06 14:10 ` Christoph Hellwig
2018-11-14 8:22 ` [PATCH 05/34] powerpc/dma: remove the unused dma_iommu_ops export Christoph Hellwig
2018-12-06 14:10 ` Christoph Hellwig
2018-11-14 8:22 ` [PATCH 06/34] powerpc/dma: split the two __dma_alloc_coherent implementations Christoph Hellwig
2018-12-06 14:10 ` Christoph Hellwig
2018-11-14 8:22 ` [PATCH 07/34] powerpc/dma: remove the no-op dma_nommu_unmap_{page,sg} routines Christoph Hellwig
2018-12-06 14:10 ` [PATCH 07/34] powerpc/dma: remove the no-op dma_nommu_unmap_{page, sg} routines Christoph Hellwig
2018-11-14 8:22 ` [PATCH 08/34] powerpc/dma: untangle vio_dma_mapping_ops from dma_iommu_ops Christoph Hellwig
2018-12-06 14:10 ` Christoph Hellwig
2018-11-14 8:22 ` [PATCH 09/34] powerpc/dma: handle iommu bypass in dma_iommu_ops Christoph Hellwig
2018-11-14 8:22 ` [PATCH 10/34] powerpc/pseries: unwind dma_get_required_mask_pSeriesLP a bit Christoph Hellwig
2018-11-14 8:22 ` [PATCH 11/34] powerpc/pseries: use the generic iommu bypass code Christoph Hellwig
2018-11-14 8:22 ` [PATCH 12/34] powerpc/cell: move dma direct window setup out of dma_configure Christoph Hellwig
2018-12-09 10:23 ` Michael Ellerman
2018-12-12 14:36 ` Christoph Hellwig
2018-12-14 13:29 ` Michael Ellerman
2018-12-14 16:42 ` Christoph Hellwig
2018-11-14 8:22 ` [PATCH 13/34] powerpc/cell: use the generic iommu bypass code Christoph Hellwig
2018-11-14 8:22 ` [PATCH 14/34] powerpc/dart: remove dead cleanup code in iommu_init_early_dart Christoph Hellwig
2018-12-06 14:11 ` Christoph Hellwig
2018-11-14 8:22 ` [PATCH 15/34] powerpc/dart: use the generic iommu bypass code Christoph Hellwig
2018-11-14 8:22 ` [PATCH 16/34] powerpc/powernv: remove pnv_pci_ioda_pe_single_vendor Christoph Hellwig
2018-11-14 8:22 ` [PATCH 17/34] powerpc/powernv: remove pnv_npu_dma_set_mask Christoph Hellwig
2018-11-14 8:22 ` [PATCH 18/34] powerpc/powernv: use the generic iommu bypass code Christoph Hellwig
2018-11-14 8:22 ` [PATCH 19/34] cxl: drop the dma_set_mask callback from vphb Christoph Hellwig
2018-12-06 14:10 ` Christoph Hellwig
2018-11-14 8:23 ` [PATCH 20/34] powerpc/dma: stop overriding dma_get_required_mask Christoph Hellwig
2018-11-14 8:23 ` [PATCH 21/34] powerpc/pci: remove the dma_set_mask pci_controller ops methods Christoph Hellwig
2018-11-14 8:23 ` [PATCH 22/34] powerpc/dma: remove the iommu fallback for coherent allocations Christoph Hellwig
2018-11-14 8:23 ` [PATCH 23/34] powerpc/dma: remove get_pci_dma_ops Christoph Hellwig
2018-11-14 8:23 ` [PATCH 24/34] powerpc/dma: move pci_dma_dev_setup_swiotlb to fsl_pci.c Christoph Hellwig
2018-11-14 8:23 ` [PATCH 25/34] powerpc/dma: remove max_direct_dma_addr Christoph Hellwig
2018-11-14 8:23 ` [PATCH 26/34] powerpc/dma: fix an off-by-one in dma_capable Christoph Hellwig
2018-11-14 8:23 ` [PATCH 27/34] powerpc/fsl_pci: simplify fsl_pci_dma_set_mask Christoph Hellwig
2018-11-14 8:23 ` [PATCH 28/34] dma-mapping, powerpc: simplify the arch dma_set_mask override Christoph Hellwig
2018-11-14 8:23 ` [PATCH 29/34] powerpc/dma: use phys_to_dma instead of get_dma_offset Christoph Hellwig
2018-11-14 8:23 ` [PATCH 30/34] powerpc/dma: remove dma_nommu_mmap_coherent Christoph Hellwig
2018-11-14 8:23 ` [PATCH 31/34] powerpc/dma: use generic direct and swiotlb ops Christoph Hellwig
2018-11-14 8:23 ` [PATCH 32/34] powerpc/dma: remove get_dma_offset Christoph Hellwig
2018-11-14 8:23 ` [PATCH 33/34] powerpc/dma: remove set_dma_offset Christoph Hellwig
2018-11-14 8:23 ` [PATCH 34/34] powerpc/dma: trim the fat from <asm/dma-mapping.h> Christoph Hellwig
2018-11-27 7:42 ` use generic DMA mapping code in powerpc V4 Christoph Hellwig
2018-11-27 22:05 ` Benjamin Herrenschmidt
2018-11-28 11:05 ` Michael Ellerman
2018-11-28 15:55 ` Christian Zigotzky
2018-11-28 20:02 ` Christian Zigotzky
2018-11-28 20:35 ` Michal Suchánek
2018-11-29 17:03 ` Christoph Hellwig
2019-12-19 13:54 ` Christian Zigotzky
2018-11-29 12:05 ` Christian Zigotzky
2018-11-29 15:30 ` Christian Zigotzky
2018-11-29 17:03 ` Christoph Hellwig
2018-11-29 23:07 ` Christian Zigotzky
2018-11-30 10:53 ` Christoph Hellwig
2018-11-30 12:23 ` Christian Zigotzky
2018-11-30 13:10 ` Christoph Hellwig
2018-11-30 15:29 ` Christian Zigotzky
2018-12-04 7:31 ` Christian Zigotzky
2018-12-04 9:53 ` Christian Zigotzky
2018-12-04 14:24 ` Christoph Hellwig
2018-12-05 9:44 ` Christian Zigotzky
2018-12-05 14:05 ` Christoph Hellwig
2018-12-06 10:55 ` Christian Zigotzky
2018-12-06 17:10 ` Christian Zigotzky
2018-12-06 19:36 ` Christoph Hellwig
2018-12-07 7:48 ` Christian Zigotzky
2018-12-07 13:45 ` Christian Zigotzky
2018-12-07 18:33 ` Christian Zigotzky
2018-12-08 10:29 ` Christian Zigotzky
2018-12-08 13:47 ` Christian Zigotzky
2018-12-09 14:20 ` Christian Zigotzky
2018-12-09 18:26 ` Christian Zigotzky
2018-12-10 15:54 ` Christian Zigotzky
2018-12-11 14:28 ` Christian Zigotzky
2018-12-11 18:17 ` Christian Zigotzky
2018-12-12 0:47 ` Benjamin Herrenschmidt
2018-12-12 7:03 ` Christian Zigotzky
2018-12-12 14:15 ` Christoph Hellwig
2018-12-12 14:39 ` Christian Zigotzky
2018-12-13 8:41 ` Christian Zigotzky
2018-12-13 9:10 ` Christoph Hellwig
2018-12-13 9:47 ` Christian Zigotzky
2018-12-13 11:19 ` Christian Zigotzky
2018-12-13 11:25 ` Christoph Hellwig
2018-12-13 13:34 ` Christian Zigotzky
2018-12-13 17:48 ` Christian Zigotzky
2018-12-13 21:53 ` Christian Zigotzky
2018-12-14 12:00 ` Christian Zigotzky
2018-12-14 16:45 ` Christoph Hellwig
2019-01-03 7:36 ` Christoph Hellwig
2019-01-03 19:26 ` Christian Zigotzky
2019-01-05 16:03 ` Christian Zigotzky
2019-01-09 9:31 ` Christian Zigotzky
2019-01-11 2:10 ` Christian Zigotzky
2019-01-12 18:14 ` Christian Zigotzky
2019-01-15 8:07 ` Christian Zigotzky
2019-01-15 8:49 ` Christian Zigotzky
2019-01-15 10:55 ` Christian Zigotzky
2019-01-15 13:35 ` Christoph Hellwig
2019-01-15 13:56 ` Christian Zigotzky
2019-01-15 15:17 ` Christoph Hellwig
2019-01-17 9:21 ` Christian Zigotzky
2019-01-17 9:31 ` Christoph Hellwig
2019-01-17 9:44 ` Christian Zigotzky
2019-01-18 8:35 ` Christoph Hellwig
2019-01-18 11:10 ` Christian Zigotzky
2019-01-18 11:28 ` Christoph Hellwig
2019-01-18 12:07 ` Christian Zigotzky
2019-01-18 12:18 ` Christoph Hellwig
2019-01-18 12:46 ` Christian Zigotzky
2019-01-18 12:55 ` Christoph Hellwig
2019-01-18 15:06 ` Christian Zigotzky
2019-01-19 11:40 ` Christian Zigotzky
2019-01-19 11:52 ` Christian Zigotzky
2019-01-19 13:02 ` Christoph Hellwig
2019-01-19 14:04 ` Christoph Hellwig
2019-01-21 14:38 ` Christian Zigotzky
2019-01-23 14:34 ` Christian Zigotzky
2019-01-25 13:37 ` Christian Zigotzky
2019-01-27 13:13 ` Christian Zigotzky
2019-01-28 7:04 ` Christoph Hellwig
[not found] ` <20190128070422.GA2772-jcswGhMUV9g@public.gmane.org>
2019-01-28 16:22 ` Christoph Hellwig
2019-01-28 16:22 ` Christoph Hellwig
2019-01-28 16:52 ` Christian Zigotzky
2019-01-28 16:52 ` Christian Zigotzky
2019-01-29 15:03 ` Christian Zigotzky
2019-01-29 16:14 ` Christoph Hellwig
2019-01-29 16:34 ` Christoph Hellwig
2019-01-30 4:40 ` Christian Zigotzky
2019-01-31 12:48 ` Christian Zigotzky
2019-02-01 8:04 ` Christoph Hellwig
2019-02-01 16:54 ` Christian Zigotzky
2019-02-03 16:49 ` Christian Zigotzky
2019-02-04 7:56 ` Christoph Hellwig
2019-02-04 12:13 ` Christian Zigotzky
2019-02-04 12:38 ` Christoph Hellwig
2019-02-06 13:45 ` Christian Zigotzky
2019-02-06 15:15 ` Christoph Hellwig
2019-02-06 15:16 ` Christoph Hellwig
2019-02-07 4:34 ` Christian Zigotzky
2019-02-08 9:01 ` Christian Zigotzky
2019-02-08 9:18 ` Christoph Hellwig
2019-02-08 10:59 ` Christian Zigotzky
2019-02-10 12:00 ` Christian Zigotzky
2019-02-11 7:16 ` Christian Zigotzky
2019-02-11 7:21 ` Christian Zigotzky
2019-02-11 7:38 ` Christoph Hellwig
2019-02-12 12:42 ` Christian Zigotzky
2019-02-12 15:25 ` Christoph Hellwig
2019-02-12 19:31 ` Christian Zigotzky
2019-02-12 19:50 ` Christian Zigotzky
2019-02-12 19:52 ` Christoph Hellwig
2019-11-05 7:56 ` Bug 205201 - overflow of DMA mask and bus mask Christian Zigotzky
2019-11-05 16:28 ` Christoph Hellwig
2019-11-06 14:09 ` Robin Murphy
2019-11-21 17:26 ` Christoph Hellwig
2019-11-07 9:53 ` Christian Zigotzky
2019-11-10 7:27 ` Christian Zigotzky
2019-11-11 8:12 ` Christian Zigotzky
2019-11-11 8:16 ` Christian Zigotzky [this message]
2019-11-11 12:22 ` Christian Zigotzky
2019-11-12 14:41 ` Christoph Hellwig
2019-11-12 22:58 ` Christian Zigotzky
2019-11-13 10:14 ` Christian Zigotzky
2019-11-13 11:02 ` Christoph Hellwig
2018-11-29 17:02 ` use generic DMA mapping code in powerpc V4 Christoph Hellwig
2018-11-30 3:17 ` Benjamin Herrenschmidt
2018-12-08 17:03 ` Christoph Hellwig
2018-12-16 16:51 ` Christoph Hellwig
2018-12-17 1:14 ` Michael Ellerman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=0c5a8009-d28b-601f-3d1a-9de0e869911c@xenosoft.de \
--to=chzigotzky@xenosoft.de \
--cc=benh@kernel.crashing.org \
--cc=contact@a-eon.com \
--cc=darren@stevens-zone.net \
--cc=hch@lst.de \
--cc=iommu@lists.linux-foundation.org \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=madskateman@gmail.com \
--cc=paulus@samba.org \
--cc=robh+dt@kernel.org \
--cc=rtd2@xtra.co.nz \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).