Re: Consult on ARM SMMU debugfs

2021-01-15 Thread Russell King - ARM Linux admin
On Mon, Jan 11, 2021 at 08:01:48PM +, Robin Murphy wrote: > On 2021-01-07 02:45, chenxiang (M) wrote: > > Hi Will,  Robin or other guys, > > > > When debugging SMMU/SVA issue on huawei ARM64 board, we find that it > > lacks of enough debugfs for ARM SMMU driver (such as > > > > the value of

Re: [PATCH 1/4] ARM/omap1: switch to use dma_direct_set_offset for lbus DMA offsets

2020-09-23 Thread Russell King - ARM Linux admin
On Mon, Sep 21, 2020 at 08:47:23AM +0200, Christoph Hellwig wrote: > On Mon, Sep 21, 2020 at 09:44:18AM +0300, Tony Lindgren wrote: > > * Janusz Krzysztofik [200919 22:29]: > > > Hi Tony, > > > > > > On Friday, September 18, 2020 7:49:33 A.M. CEST Tony Lindgren wrote: > > > > * Christoph Hellwig

Re: [PATCH 2/4] ARM/footbridge: switch to use dma_direct_set_offset for lbus DMA offsets

2020-09-17 Thread Russell King - ARM Linux admin
On Thu, Sep 17, 2020 at 07:32:27PM +0200, Christoph Hellwig wrote: > static int __init cats_pci_init(void) > { > - if (machine_is_cats()) > - pci_common_init(_pci); > + if (!machine_is_cats()) > + return 0; > + bus_register_notifier(_bus_type, _pci_dma_nb); >

Re: [PATCH 3/4] ARM/dma-mapping: don't handle NULL devices in dma-direct.h

2020-09-17 Thread Russell King - ARM Linux admin
On Thu, Sep 17, 2020 at 07:32:28PM +0200, Christoph Hellwig wrote: > The DMA API removed support for not passing in a device a long time > ago, so remove the NULL checks. What happens with ISA devices? -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps

Re: [PATCH 2/3] ARM/keystone: move the DMA offset handling under ifdef CONFIG_ARM_LPAE

2020-09-11 Thread Russell King - ARM Linux admin
On Thu, Sep 10, 2020 at 07:40:37AM +0200, Christoph Hellwig wrote: > The DMA offset notifier can only be used if PHYS_OFFSET is at least > KEYSTONE_HIGH_PHYS_START, which can't be represented by a 32-bit > phys_addr_t. Currently the code compiles fine despite that, a pending > change to the DMA

Re: decruft the vmalloc API

2020-04-08 Thread Russell King - ARM Linux admin
On Wed, Apr 08, 2020 at 01:58:58PM +0200, Christoph Hellwig wrote: > Hi all, > > Peter noticed that with some dumb luck you can toast the kernel address > space with exported vmalloc symbols. > > I used this as an opportunity to decruft the vmalloc.c API and make it > much more systematic. This

Re: [PATCH] iommu: silence iommu group prints

2020-03-04 Thread Russell King - ARM Linux admin
On Wed, Mar 04, 2020 at 12:33:14PM +0200, Laurentiu Tudor wrote: > > > On 04.03.2020 12:07, Russell King - ARM Linux admin wrote: > > On Wed, Mar 04, 2020 at 11:56:53AM +0200, Laurentiu Tudor wrote: > > > From 44ae46501b5379bd0890df87fd3827248626ed03 Mon Sep 17

Re: [PATCH] iommu: silence iommu group prints

2020-03-04 Thread Russell King - ARM Linux admin
On Wed, Mar 04, 2020 at 11:56:53AM +0200, Laurentiu Tudor wrote: > From 44ae46501b5379bd0890df87fd3827248626ed03 Mon Sep 17 00:00:00 2001 > From: Laurentiu Tudor > Date: Tue, 1 Oct 2019 16:22:48 +0300 > Subject: [PATCH 1/6] bus: fsl-mc: make mc work with smmu disable bypass on > Content-Type:

Re: [PATCH] iommu: silence iommu group prints

2020-03-04 Thread Russell King - ARM Linux admin
On Wed, Mar 04, 2020 at 11:42:16AM +0200, Laurentiu Tudor wrote: > On 04.03.2020 11:33, Russell King - ARM Linux admin wrote: > > On Wed, Mar 04, 2020 at 10:56:06AM +0200, Laurentiu Tudor wrote: > > > > > > On 04.03.2020 00:17, Russell King - ARM Linux admin wrote: &

Re: [PATCH] iommu: silence iommu group prints

2020-03-04 Thread Russell King - ARM Linux admin
On Wed, Mar 04, 2020 at 10:56:06AM +0200, Laurentiu Tudor wrote: > > On 04.03.2020 00:17, Russell King - ARM Linux admin wrote: > > On Tue, Mar 03, 2020 at 05:55:05PM +0200, Laurentiu Tudor wrote: > > > From c98dc05cdd45ae923654f2427985bd28bcde4bb2 Mon Sep 17 00:00:00 2001

Re: [PATCH] iommu: silence iommu group prints

2020-03-03 Thread Russell King - ARM Linux admin
On Tue, Mar 03, 2020 at 05:55:05PM +0200, Laurentiu Tudor wrote: > From c98dc05cdd45ae923654f2427985bd28bcde4bb2 Mon Sep 17 00:00:00 2001 > From: Laurentiu Tudor > Date: Thu, 13 Feb 2020 11:59:12 +0200 > Subject: [PATCH 1/4] bus: fsl-mc: add custom .dma_configure implementation > Content-Type:

Re: [PATCH] iommu: silence iommu group prints

2020-03-03 Thread Russell King - ARM Linux admin
the end (for context). > > > > On 28/02/2020 10:06 am, Russell King - ARM Linux admin wrote: > > > On Fri, Feb 28, 2020 at 09:33:40AM +, John Garry wrote: > > > > On 28/02/2020 02:16, Lu Baolu wrote: > > > > > Hi, > > > > > >

Re: [PATCH] iommu: silence iommu group prints

2020-02-28 Thread Russell King - ARM Linux admin
On Fri, Feb 28, 2020 at 09:33:40AM +, John Garry wrote: > On 28/02/2020 02:16, Lu Baolu wrote: > > Hi, > > > > On 2020/2/27 19:57, Russell King wrote: > > > On the LX2160A, there are lots (about 160) of IOMMU messages produced > > > during boot; this is excessive.  Reduce the severity of

Re: [PATCH] iommu: silence iommu group prints

2020-02-27 Thread Russell King - ARM Linux admin
On Thu, Feb 27, 2020 at 06:19:10PM +, Robin Murphy wrote: > On 27/02/2020 1:48 pm, Russell King - ARM Linux admin wrote: > > On Thu, Feb 27, 2020 at 01:44:56PM +, Robin Murphy wrote: > > > On 27/02/2020 11:57 am, Russell King wrote: > > > > On the LX21

Re: [PATCH] iommu: silence iommu group prints

2020-02-27 Thread Russell King - ARM Linux admin
On Thu, Feb 27, 2020 at 01:44:56PM +, Robin Murphy wrote: > On 27/02/2020 11:57 am, Russell King wrote: > > On the LX2160A, there are lots (about 160) of IOMMU messages produced > > during boot; this is excessive. Reduce the severity of these messages > > to debug level. > > That's... a lot.

Re: [PATCH] iommu/arm-smmu: fix the module name for disable_bypass parameter

2020-02-11 Thread Russell King - ARM Linux admin
On Tue, Feb 11, 2020 at 05:36:55PM -0600, Li Yang wrote: > Since commit cd221bd24ff5 ("iommu/arm-smmu: Allow building as a module"), > there is a side effect that the module name is changed from arm-smmu to > arm-smmu-mod. So the kernel parameter for disable_bypass need to be > changed too. Fix

Re: [PATCH] iommu/arm-smmu: Report USF more clearly

2019-09-13 Thread Russell King - ARM Linux admin
On Fri, Sep 13, 2019 at 12:48:37PM +0100, Robin Murphy wrote: > Although CONFIG_ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT is a welcome tool > for smoking out inadequate firmware, the failure mode is non-obvious > and can be confusing for end users. Add some special-case reporting of > Unidentified Stream

Re: [PATCH 1/4] vmalloc: lift the arm flag for coherent mappings to common code

2019-08-30 Thread Russell King - ARM Linux admin
On Fri, Aug 30, 2019 at 08:29:21AM +0200, Christoph Hellwig wrote: > The arm architecture had a VM_ARM_DMA_CONSISTENT flag to mark DMA > coherent remapping for a while. Lift this flag to common code so > that we can use it generically. We also check it in the only place > VM_USERMAP is directly

Re: [PATCH] dma-mapping: fix page attributes for dma_mmap_*

2019-08-06 Thread Russell King - ARM Linux admin
On Tue, Aug 06, 2019 at 05:45:03PM +0100, Russell King - ARM Linux admin wrote: > On Tue, Aug 06, 2019 at 05:08:54PM +0100, Will Deacon wrote: > > On Sat, Aug 03, 2019 at 08:48:12AM +0200, Christoph Hellwig wrote: > > > On Fri, Aug 02, 2019 at 11:38:03AM +0100,

Re: [PATCH] dma-mapping: fix page attributes for dma_mmap_*

2019-08-06 Thread Russell King - ARM Linux admin
On Tue, Aug 06, 2019 at 05:08:54PM +0100, Will Deacon wrote: > On Sat, Aug 03, 2019 at 08:48:12AM +0200, Christoph Hellwig wrote: > > On Fri, Aug 02, 2019 at 11:38:03AM +0100, Will Deacon wrote: > > > > > > So this boils down to a terminology mismatch. The Arm architecture > > > doesn't have > >

Re: SATA broken with LPAE

2019-06-27 Thread Russell King - ARM Linux admin
On Thu, Jun 27, 2019 at 11:15:30AM +0200, Christoph Hellwig wrote: > On Thu, Jun 27, 2019 at 10:07:53AM +0100, Russell King - ARM Linux admin > wrote: > > dmabounce has only ever been used with specific devices that have weird > > setups. Otherwise, we've never expected what y

Re: SATA broken with LPAE

2019-06-27 Thread Russell King - ARM Linux admin
On Wed, Jun 26, 2019 at 02:53:25PM +0200, Christoph Hellwig wrote: > Hi Roger, > > it seems the arm dma direct mapping code isn't doing the right thing > here. On other platforms that have > 4G memory we always use swiotlb > for bounce buffering in case a device that can't DMA to all the memory.

Re: [PATCH 2/2] ARM: dma-mapping: allow larger DMA mask than supported

2019-05-21 Thread Russell King - ARM Linux admin
On Tue, May 21, 2019 at 02:47:29PM +0200, Christoph Hellwig wrote: > Since Linux 5.1 we allow drivers to just set the largest DMA mask they > support instead of falling back to smaller ones. This doesn't make sense. "they" is confusing - why would a driver set a DMA mask larger than the driver

Re: [PATCH 1/2] dma-mapping: truncate dma masks to what dma_addr_t can hold

2019-05-21 Thread Russell King - ARM Linux admin
On Tue, May 21, 2019 at 02:47:28PM +0200, Christoph Hellwig wrote: > The dma masks in struct device are always 64-bits wide. But for builds > using a 32-bit dma_addr_t we need to ensure we don't store an > unsupportable value. Before Linux 5.0 this was handled at least by > the ARM dma mapping

Re: remove NULL struct device support in the DMA API

2019-04-03 Thread Russell King - ARM Linux admin
On Thu, Mar 21, 2019 at 03:52:28PM -0700, Christoph Hellwig wrote: > We still have a few drivers which pass a NULL struct device pointer > to DMA API functions, which generally is a bad idea as the API > implementations rely on the device not only for ops selection, but > also the dma mask and