Hi Will,
On Mon, Nov 09, 2015 at 10:10:59AM +, Will Deacon wrote:
>On Mon, Nov 09, 2015 at 02:13:28PM +0800, Peng Fan wrote:
>> The basic flow for iommu_group_for_dev is:
>> iommu_group_get_for_dev
>> |-> iommu_group_get : increase reference count by 1.
>
Hi Alex,
On Mon, Nov 09, 2015 at 08:28:09AM -0700, Alex Williamson wrote:
>On Mon, 2015-11-09 at 14:13 +0800, Peng Fan wrote:
>> The basic flow for iommu_group_for_dev is:
>> iommu_group_get_for_dev
>> |-> iommu_group_get : increase reference count by 1.
>
nly increase reference count by 1.
Signed-off-by: Peng Fan <van.free...@gmail.com>
Cc: Joerg Roedel <j...@8bytes.org>
Cc: Will Deacon <will.dea...@arm.com>
---
V1 thread: https://lkml.org/lkml/2015/11/3/304
Changes V2:
I did not see the update about device_group when I wor
Hi Will,
On Fri, Nov 06, 2015 at 12:23:39PM +, Will Deacon wrote:
>On Wed, Nov 04, 2015 at 10:48:28AM +0800, Peng Fan wrote:
>> On Tue, Nov 03, 2015 at 01:17:34PM +, Will Deacon wrote:
>> >On Tue, Nov 03, 2015 at 08:59:17PM +0800, Peng Fan wrote:
>> >> iom
Hi Robin, Will,
On Wed, Nov 04, 2015 at 03:31:55PM +, Robin Murphy wrote:
>On 04/11/15 14:43, Will Deacon wrote:
>>On Wed, Nov 04, 2015 at 09:44:40PM +0800, Peng Fan wrote:
>>>Hi Will,
>>
>>Hello,
>>
>>>I am trying to enable SMMU(mmu500) on an
Hi Will,
I am trying to enable SMMU(mmu500) on an platform.
My platform support only 32 SIDs, but it have more than 100 masters.
So I need to let different masters share one SID. I read current
arm-smmu.c, but it needs each master has unique SID. Do you have
some suggestions about how to let
iommu_group_alloc will initialize the reference count for group to 1.
iommu_group_add_device also increase the group reference count,
if nothing bad happends. And we need to add iommu_group_put to
decrease the reference count for group.
Signed-off-by: Peng Fan <van.free...@gmail.com&
Hi Will,
On Tue, Nov 03, 2015 at 01:17:34PM +, Will Deacon wrote:
>On Tue, Nov 03, 2015 at 08:59:17PM +0800, Peng Fan wrote:
>> iommu_group_alloc will initialize the reference count for group to 1.
>> iommu_group_add_device also increase the group reference count,
>> if
>Since we are adding one device, the flow is (2) and the group reference
>count will be increased by 2. So, we need to add iommu_group_put at the
>end of arm_smmu_add_device to decrease the count by 1.
>
>Also take the failure path into consideration when fail to add a device.
>
Hi Will,
On Tue, Nov 17, 2015 at 04:17:46PM +, Will Deacon wrote:
>On Tue, Nov 10, 2015 at 09:56:26AM +0800, Peng Fan wrote:
>> The basic flow for add a device:
>> arm_smmu_add_device
>> |->iommu_group_get_for_dev
>> |->iommu_group_get
>
According MMU-500 TRM, section 3.7.1 Auxiliary Control registers,
You can modify ACTLR only when the ACR.CACHE_LOCK bit is 0.
So before clearing ARM_MMU500_ACTLR_CPRE of each context bank,
need clear CACHE_LOCK bit of ACR register first.
Signed-off-by: Peng Fan <van.free...@gmail.com&
Hi Robin,
On Tue, May 03, 2016 at 12:15:52PM +0100, Robin Murphy wrote:
>On 03/05/16 11:15, Peng Fan wrote:
>>According MMU-500 TRM, section 3.7.1 Auxiliary Control registers,
>>You can modify ACTLR only when the ACR.CACHE_LOCK bit is 0.
>>
>>So before clearing AR
There is no need to call devm_free_irq when driver detach.
devres_release_all which is called after 'drv->remove' will
release all managed resources.
Signed-off-by: Peng Fan <van.free...@gmail.com>
Reviewed-by: Robin Murphy <robin.mur...@arm.com>
Cc: Will Deacon <will.dea..
There is no need to call devm_free_irq when driver detach.
devres_release_all which is called after 'drv->remove' will
release all managed resources.
Signed-off-by: Peng Fan <van.free...@gmail.com>
Cc: Will Deacon <will.dea...@arm.com>
Cc: Robin Murphy <robin.mur...@arm.com&g
Hi Robin,
On Mon, Jul 11, 2016 at 11:32:55AM +0100, Robin Murphy wrote:
>On 04/07/16 10:38, Peng Fan wrote:
>> Use devm_request_irq to simplify error handling path,
>> when probe smmu device.
>>
>> Also devm_{request|free}_irq when init or destroy domain context.
>
>From code "SMR mask 0x%x out of range for SMMU",
so, we need to use mask, not sid.
Signed-off-by: Peng Fan <peng@nxp.com>
Cc: Will Deacon <will.dea...@arm.com>
Cc: Robin Murphy <robin.mur...@arm.com>
---
drivers/iommu/arm-smmu.c | 2 +-
1 file changed, 1 in
> -Original Message-
> From: Peng Fan
> Sent: Sunday, November 26, 2017 9:14 PM
> To: h...@lst.de; m.szyprow...@samsung.com; robin.mur...@arm.com;
> gre...@linuxfoundation.org; robh...@kernel.org; frowand.l...@gmail.com
> Cc: iommu@lists.linux-foundation.org; linux-ker.
Invoke of_reserved_mem_device_init at dma_configure, then
there is no need to call of_reserved_mem_device_init in device
specific probe function.
Signed-off-by: Peng Fan <peng@nxp.com>
---
drivers/base/dma-mapping.c | 6 +-
1 file changed, 5 insertions(+), 1 deletion(-)
diff
reserved memory for a device which needs iommu.
Signed-off-by: Peng Fan <peng@nxp.com>
---
drivers/of/of_reserved_mem.c | 9 ++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 22b75c82e377..61523819b50
Hi Marek,
On Mon, Nov 27, 2017 at 09:31:00AM +0100, Marek Szyprowski wrote:
>Hi
>
>On 2017-11-26 14:13, Peng Fan wrote:
>> Invoke of_reserved_mem_device_init at dma_configure, then
>> there is no need to call of_reserved_mem_device_init in device
>> specific probe
Hi Marek,
On Mon, Nov 27, 2017 at 09:44:20AM +0100, Marek Szyprowski wrote:
>Hi Peng,
>
>On 2017-11-27 09:37, Peng Fan wrote:
>> Hi Marek,
>>
>> On Mon, Nov 27, 2017 at 09:31:00AM +0100, Marek Szyprowski wrote:
>> > Hi
>> >
>> &
From: Peng Fan
When booting xen on i.MX8QM, met:
"
[3.602128] Unable to handle kernel paging request at virtual address
00272d40
[3.610804] Mem abort info:
[3.613905] ESR = 0x9604
[3.617332] EC = 0x25: DABT (current EL), IL = 32 bits
[3.623211] SET = 0
age_boundary(phys, size) are true, it will create
> > contiguous region. So when free, we need to free contiguous region use
> > upper check condition.
> >
> > Signed-off-by: Peng Fan
> > ---
> > drivers/xen/swiotlb-xen.c | 4 ++--
> > 1 file changed, 2 ins
> Subject: Re: [PATCH] xen/swiotlb: correct the check for
> xen_destroy_contiguous_region
>
> On 28.04.20 09:33, peng@nxp.com wrote:
> > From: Peng Fan
> >
> > When booting xen on i.MX8QM, met:
> > "
> > [3.602128] Unable to
> Subject: RE: [PATCH] xen: introduce xen_vring_use_dma
>
> On Mon, 29 Jun 2020, Peng Fan wrote:
> > > > If that is the case, how is it possible that virtio breaks on ARM
> > > > using the default dma_ops? The breakage is not Xen related (except
> > >
> Subject: Re: [PATCH] xen: introduce xen_vring_use_dma
>
> Sorry for the late reply -- a couple of conferences kept me busy.
>
>
> On Wed, 1 Jul 2020, Michael S. Tsirkin wrote:
> > On Wed, Jul 01, 2020 at 10:34:53AM -0700, Stefano Stabellini wrote:
> > > Would you be in favor of a more
Export xen_swiotlb for all platforms using xen swiotlb
Use xen_swiotlb to determine when vring should use dma APIs to map the
ring: when xen_swiotlb is enabled the dma API is required. When it is
disabled, it is not required.
Signed-off-by: Peng Fan
---
V2:
This is a modified version from
> On Wed, 24 Jun 2020, Michael S. Tsirkin wrote:
> > > > > On Wed, Jun 24, 2020 at 10:59:47AM -0700, Stefano Stabellini wrote:
> > > > > > On Wed, 24 Jun 2020, Michael S. Tsirkin wrote:
> > > > > > > On Wed, Jun 24, 2020 at 05:17:32PM +08
4, 2020 at 10:59:47AM -0700, Stefano Stabellini wrote:
> > > > > On Wed, 24 Jun 2020, Michael S. Tsirkin wrote:
> > > > > > On Wed, Jun 24, 2020 at 05:17:32PM +0800, Peng Fan wrote:
> > > > > > > Export xen_swiotlb for all platforms using xen swiot
> Subject: Re: [PATCH] xen: introduce xen_vring_use_dma
>
> On Mon, Jun 29, 2020 at 03:05:19AM +0000, Peng Fan wrote:
> > > Subject: Re: [PATCH] xen: introduce xen_vring_use_dma
> > >
> > > On Thu, Jun 25, 2020 at 10:31:27AM -0700, Stefano Stabellini wrote:
&g
> Subject: Re: [PATCH] xen: introduce xen_vring_use_dma
>
> On Mon, Jun 29, 2020 at 06:25:41AM +0000, Peng Fan wrote:
> > > > > > Anyway, re-reading the last messages of the original thread
> > > > > > [1], it looks like Peng had a clear idea
i.MX8MP-EVK, works well now.
Tested-by: Peng Fan #i.MX8MP-EVK
Thanks,
Peng.
>
> -Saravana
>
> Cc: Sascha Hauer
> Cc: Peng Fan
> Cc: Kevin Hilman
> Cc: Ulf Hansson
> Cc: Len Brown
> Cc: Pavel Machek
> Cc: Joerg Roedel
> Cc: Will Deacon
> Cc: Andrew Lun
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