s can decide to
use MSI polling or not based on their tests.
Signed-off-by: Barry Song
---
-v3:
* rebase on top of linux-next as arm-smmu-v3.c has moved;
* provide a command line option
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 18 ++
1 file changed, 14 insertions(
: Ganapatrao Kulkarni
Cc: Catalin Marinas
Cc: Nicolas Saenz Julienne
Cc: Steve Capper
Cc: Andrew Morton
Cc: Mike Rapoport
Signed-off-by: Barry Song
---
arch/arm64/mm/init.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index b6881d61b818
: Christoph Hellwig
Cc: Marek Szyprowski
Cc: Will Deacon
Cc: Robin Murphy
Cc: Ganapatrao Kulkarni
Cc: Catalin Marinas
Cc: Nicolas Saenz Julienne
Cc: Steve Capper
Cc: Andrew Morton
Cc: Mike Rapoport
Signed-off-by: Barry Song
---
-v5:
refine code according to Christoph Hellwig's com
arameter for per-numa could
make life easier.
* move dma_pernuma_cma_reserve() after hugetlb_cma_reserve() to
reuse the comment before hugetlb_cma_reserve() with respect to
Robin's comment
-v2:
* fix some issues reported by kernel test robot
* fallback to default cma while alloca
> -Original Message-
> From: Will Deacon [mailto:w...@kernel.org]
> Sent: Saturday, August 1, 2020 12:22 AM
> To: Song Bao Hua (Barry Song)
> Cc: John Garry ; robin.mur...@arm.com;
> j...@8bytes.org; iommu@lists.linux-foundation.org; Zengtao (B)
> ; Linux
> -Original Message-
> From: John Garry
> Sent: Friday, July 31, 2020 10:21 PM
> To: Song Bao Hua (Barry Song) ; w...@kernel.org;
> robin.mur...@arm.com; j...@8bytes.org; iommu@lists.linux-foundation.org
> Cc: Zengtao (B) ; Linuxarm
> ; linux-arm-ker...@lists.infrad
strict, TX throughput can improve from
25Gbps to 27Gbps by this patch.
This patch adds a generic function to support implementation options
based on IIDR and disables MSI polling if IIDR matches the specific
implementation tested.
Cc: Prime Zeng
Signed-off-by: Barry Song
---
-v2: rather than
> -Original Message-
> From: Christoph Hellwig [mailto:h...@lst.de]
> Sent: Wednesday, July 29, 2020 12:23 AM
> To: Song Bao Hua (Barry Song)
> Cc: Christoph Hellwig ; m.szyprow...@samsung.com;
> robin.mur...@arm.com; w...@kernel.org; ganapatrao.kulka...@cavium.c
> -Original Message-
> From: Christoph Hellwig [mailto:h...@lst.de]
> Sent: Tuesday, July 28, 2020 11:53 PM
> To: Song Bao Hua (Barry Song)
> Cc: h...@lst.de; m.szyprow...@samsung.com; robin.mur...@arm.com;
> w...@kernel.org; ganapatrao.kulka...@cavium.com;
> ca
ts have been gone from the DMA API for a while.
>
> Signed-off-by: Christoph Hellwig
Reviewed-by: Barry Song
And I have rebased per-numa CMA patchset on top of this one.
https://lore.kernel.org/linux-arm-kernel/20200723131344.41472-1-song.bao@hisilicon.com/
> ---
>
> Changes sin
ier.
* move dma_pernuma_cma_reserve() after hugetlb_cma_reserve() to
reuse the comment before hugetlb_cma_reserve() with respect to
Robin's comment
-v2:
* fix some issues reported by kernel test robot
* fallback to default cma while allocation fails in per-numa cma
free memor
: Christoph Hellwig
Cc: Marek Szyprowski
Cc: Will Deacon
Cc: Robin Murphy
Cc: Ganapatrao Kulkarni
Cc: Catalin Marinas
Cc: Nicolas Saenz Julienne
Cc: Steve Capper
Cc: Andrew Morton
Cc: Mike Rapoport
Signed-off-by: Barry Song
---
-v4:
* rebase on top of Christoph Hellwig's patch:
[PATCH v2
: Ganapatrao Kulkarni
Cc: Catalin Marinas
Cc: Nicolas Saenz Julienne
Cc: Steve Capper
Cc: Andrew Morton
Cc: Mike Rapoport
Signed-off-by: Barry Song
---
-v4:
* rebase on top of linux-next to avoid arch/arm64 conflicts
arch/arm64/mm/init.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a
> -Original Message-
> From: Christoph Hellwig [mailto:h...@lst.de]
> Sent: Friday, July 24, 2020 12:01 AM
> To: Song Bao Hua (Barry Song)
> Cc: Christoph Hellwig ; m.szyprow...@samsung.com;
> robin.mur...@arm.com; w...@kernel.org; ganapatrao.kulka...@cavium.c
> -Original Message-
> From: Christoph Hellwig [mailto:h...@lst.de]
> Sent: Thursday, July 23, 2020 2:30 AM
> To: Song Bao Hua (Barry Song)
> Cc: h...@lst.de; m.szyprow...@samsung.com; robin.mur...@arm.com;
> w...@kernel.org; ganapatrao.kulka...@cavium.com;
> ca
> -Original Message-
> From: Christoph Hellwig [mailto:h...@lst.de]
> Sent: Thursday, July 23, 2020 2:17 AM
> To: Song Bao Hua (Barry Song)
> Cc: h...@lst.de; m.szyprow...@samsung.com; robin.mur...@arm.com;
> w...@kernel.org; ganapatrao.kulka...@cavium.com;
> ca
> -Original Message-
> From: Song Bao Hua (Barry Song)
> Sent: Friday, July 17, 2020 9:06 PM
> To: 'Robin Murphy' ; w...@kernel.org;
> j...@8bytes.org
> Cc: linux-ker...@vger.kernel.org; Linuxarm ;
> linux-arm-ker...@lists.infradead.org; iommu@lists.lin
> -Original Message-
> From: Robin Murphy [mailto:robin.mur...@arm.com]
> Sent: Friday, July 17, 2020 8:55 PM
> To: Song Bao Hua (Barry Song) ; w...@kernel.org;
> j...@8bytes.org
> Cc: linux-ker...@vger.kernel.org; Linuxarm ;
> linux-arm-ker...@lists.infradead.o
rf on hns3 100G NIC with UDP packet size
in 32768bytes and set iommu to strict, TX throughput can improve from
25227.74Mbps to 27145.59Mbps by this patch. In this case, SMMU is super
busy as hns3 sends map/unmap requests extremely frequently.
Cc: Prime Zeng
Signed-off-by: Barry Song
---
drivers
> -Original Message-
> From: Song Bao Hua (Barry Song)
> Sent: Sunday, June 28, 2020 11:13 PM
> To: h...@lst.de; m.szyprow...@samsung.com; robin.mur...@arm.com;
> w...@kernel.org; ganapatrao.kulka...@cavium.com;
> catalin.mari...@arm.com
> Cc: iommu@lists.linux-fou
> -Original Message-
> From: netdev-ow...@vger.kernel.org [mailto:netdev-ow...@vger.kernel.org]
> On Behalf Of Christoph Hellwig
> Sent: Wednesday, July 8, 2020 6:50 PM
> To: Robin Murphy
> Cc: Björn Töpel ; Christoph Hellwig ;
> Daniel Borkmann ; maxi...@mellanox.com;
> konrad.w...@ora
> -Original Message-
> From: Will Deacon [mailto:w...@kernel.org]
> Sent: Saturday, July 4, 2020 4:22 AM
> To: Song Bao Hua (Barry Song)
> Cc: h...@lst.de; m.szyprow...@samsung.com; robin.mur...@arm.com;
> linux-arm-ker...@lists.infradead.org; iommu@lists.li
> -Original Message-
> From: Will Deacon [mailto:w...@kernel.org]
> Sent: Saturday, July 4, 2020 4:22 AM
> To: Song Bao Hua (Barry Song)
> Cc: robin.mur...@arm.com; h...@lst.de; m.szyprow...@samsung.com;
> iommu@lists.linux-foundation.org; linux-arm-ker...@l
ve() to
reuse the comment before hugetlb_cma_reserve() with respect to
Robin's comment
-v2:
* fix some issues reported by kernel test robot
* fallback to default cma while allocation fails in per-numa cma
free memory properly
Barry Song (2):
dma-direct: provide the ability to
: Ganapatrao Kulkarni
Cc: Catalin Marinas
Cc: Nicolas Saenz Julienne
Cc: Steve Capper
Cc: Andrew Morton
Cc: Mike Rapoport
Signed-off-by: Barry Song
---
-v3:
* move dma_pernuma_cma_reserve() after hugetlb_cma_reserve() to
reuse the comment before hugetlb_cma_reserve() with respect to
Robin&#
Hellwig
Cc: Marek Szyprowski
Cc: Will Deacon
Cc: Robin Murphy
Cc: Ganapatrao Kulkarni
Cc: Catalin Marinas
Cc: Nicolas Saenz Julienne
Cc: Steve Capper
Cc: Andrew Morton
Cc: Mike Rapoport
Signed-off-by: Barry Song
---
-v3:
* move to use page_to_nid() while freeing cma with respect to
> -Original Message-
> From: linux-kernel-ow...@vger.kernel.org
> [mailto:linux-kernel-ow...@vger.kernel.org] On Behalf Of Robin Murphy
> Sent: Thursday, June 25, 2020 11:11 PM
> To: Song Bao Hua (Barry Song) ; h...@lst.de;
> m.szyprow...@samsung.com; w...@kernel.org;
> -Original Message-
> From: Robin Murphy [mailto:robin.mur...@arm.com]
> Sent: Thursday, June 25, 2020 11:16 PM
> To: Song Bao Hua (Barry Song) ; h...@lst.de;
> m.szyprow...@samsung.com; w...@kernel.org;
> ganapatrao.kulka...@cavium.com; catalin.mari...@arm.com
>
allocation fails in
per-numa cma according to Jonathan Cameron's suggestion;
free memory properly
Barry Song (2):
dma-direct: provide the ability to reserve per-numa CMA
arm64: mm: reserve per-numa CMA after numa_init
arch/arm64/mm/init.c | 2 +
include/linux/dma-co
: Ganapatrao Kulkarni
Cc: Catalin Marinas
Cc: Nicolas Saenz Julienne
Cc: Steve Capper
Cc: Andrew Morton
Cc: Mike Rapoport
Signed-off-by: Barry Song
---
arch/arm64/mm/init.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 1e93cfc7c47a
Hellwig
Cc: Marek Szyprowski
Cc: Will Deacon
Cc: Robin Murphy
Cc: Ganapatrao Kulkarni
Cc: Catalin Marinas
Cc: Nicolas Saenz Julienne
Cc: Steve Capper
Cc: Andrew Morton
Cc: Mike Rapoport
Signed-off-by: Barry Song
---
include/linux/dma-contiguous.h | 4 ++
kernel/dma/Kconfig
> -Original Message-
> From: Matthias Brugger [mailto:matthias@gmail.com]
> Sent: Monday, June 8, 2020 8:15 AM
> To: Roman Gushchin ; Song Bao Hua (Barry Song)
>
> Cc: catalin.mari...@arm.com; John Garry ;
> linux-ker...@vger.kernel.org; Linuxarm
> -Original Message-
> From: Philip Li [mailto:philip...@intel.com]
> Sent: Saturday, June 6, 2020 3:47 PM
> To: Dan Carpenter
> Cc: Song Bao Hua (Barry Song) ;
> kbu...@lists.01.org; h...@lst.de; m.szyprow...@samsung.com;
> robin.mur...@arm.com; catalin.mari...@ar
> -Original Message-
> From: Dan Carpenter [mailto:dan.carpen...@oracle.com]
> Sent: Thursday, June 4, 2020 11:37 PM
> To: kbu...@lists.01.org; Song Bao Hua (Barry Song)
> ; h...@lst.de; m.szyprow...@samsung.com;
> robin.mur...@arm.com; catalin.mari...@arm.com
> Cc
tables. that means dma_unmap latency will be shrunk much.
Meanwhile, when iommu.passthrough is on, device drivers which call dma_
alloc_coherent() will also get local memory and avoid the travel between
numa nodes.
Cc: Will Deacon
Cc: Robin Murphy
Signed-off-by: Barry Song
---
arch/arm64/mm/init.c
-by: Barry Song
---
include/linux/dma-contiguous.h | 4
kernel/dma/Kconfig | 10 +
kernel/dma/contiguous.c| 41 +-
3 files changed, 54 insertions(+), 1 deletion(-)
diff --git a/include/linux/dma-contiguous.h b/include/linux/dma
hugetlb_cma_reserve() is called at the wrong place. numa_init has not been
done yet. so all reserved memory will be located at node0.
Cc: Roman Gushchin
Signed-off-by: Barry Song
---
arch/arm64/mm/init.c | 10 +-
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/arm64
memory from local numa node to save command
queues and page tables. that means dma_unmap latency will be shrunk much.
Meanwhile, when iommu.passthrough is on, device drivers which call dma_
alloc_coherent() will also get local memory and avoid the travel between
numa nodes.
Barry Song (3):
dma-direct
> >
> > On Tue, Jun 02, 2020 at 05:09:57AM +, Song Bao Hua (Barry Song)
> wrote:
> > > > >
> > > > > Platform devices are NUMA? That's crazy, and feels like a total
> > > > > abuse of platform devices and drivers
> -Original Message-
> From: Greg KH [mailto:gre...@linuxfoundation.org]
> Sent: Tuesday, June 2, 2020 6:11 PM
> To: Song Bao Hua (Barry Song)
> Cc: raf...@kernel.org; iommu@lists.linux-foundation.org;
> linux-arm-ker...@lists.infradead.org; linux-ker...@vger.ke
Zeng
Cc: Robin Murphy
Signed-off-by: Barry Song
---
-v2: add the numa_node entry in Documentation/ABI/
Documentation/ABI/testing/sysfs-bus-platform | 10
drivers/base/platform.c | 26 +++-
2 files changed, 35 insertions(+), 1 deletion(-)
diff --git
> >
> > Platform devices are NUMA? That's crazy, and feels like a total abuse
> > of platform devices and drivers that really should belong on a "real"
> > bus.
>
> I am not sure if it is an abuse of platform device. But smmu is a platform
> device,
> drivers/iommu/arm-smmu-v3.c is a platform dri
> -Original Message-
> From: Greg KH [mailto:gre...@linuxfoundation.org]
> Sent: Tuesday, June 2, 2020 4:24 PM
> To: Song Bao Hua (Barry Song)
> Cc: raf...@kernel.org; iommu@lists.linux-foundation.org;
> linux-arm-ker...@lists.infradead.org; linux-ker...@vger.ke
Zeng
Cc: Robin Murphy
Signed-off-by: Barry Song
---
drivers/base/platform.c | 26 +-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index b27d0f6c18c9..7794b9a38d82 100644
--- a/drivers/base/platform.c
+++ b
> -Original Message-
> From: Robin Murphy [mailto:robin.mur...@arm.com]
> Sent: Tuesday, June 2, 2020 1:14 AM
> To: Song Bao Hua (Barry Song) ; w...@kernel.org;
> h...@lst.de; m.szyprow...@samsung.com; iommu@lists.linux-foundation.org
> Cc: Linuxa
:16010101T02
TZOFFSETFROM:+1200
TZOFFSETTO:+1300
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=9
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
ORGANIZER;CN=Song Bao Hua (Barry Song):MAILTO:song.bao@hisilicon.com
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=h...@lst.de
:MAILTO:h
de2, without this patch, it takes 550ns to wait for the completion
of CMD_SYNC; with this patch, it takes 250ns to wait for the completion
of CMD_SYNC.
Signed-off-by: Barry Song
---
drivers/iommu/arm-smmu-v3.c | 63 -
1 file changed, 48 insertions(+), 15 del
without
checking hardware spec at all.
Signed-off-by: Barry Song
---
drivers/iommu/arm-smmu-v3.c | 40 -
1 file changed, 39 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 82508730feb7..754c4d59498b
> Subject: Re: arm-smmu-v3 high cpu usage for NVMe
>
> On 20/03/2020 10:41, John Garry wrote:
>
> + Barry, Alexandru
>
> > PerfTop: 85864 irqs/sec kernel:89.6% exact: 0.0% lost:
> > 0/34434 drop:
> > 0/40116 [4000Hz cycles], (all, 96 CPUs)
> >
>
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