eback)
Step 3, dma_from_device
Step 4, dma_unmap_single
If a DMA buffer and a kernel structure share a same cache line, and if
the kernel structure has dirty data, cache_invalidate (no writeback)
will cause data lost.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Chen
---
drivers
I suggest to drop sync_r4k completely, because it is inaccurate. You
can use IPI to synchronize count/compare instead, as Loongson-3 does.
Huacai
On Mon, Aug 28, 2017 at 6:07 PM, Matija Glavinic Pecotic
wrote:
> On 08/23/2017 10:21 AM, Matt Redfearn wrote:
>> As noted in the commit message, upst
Yes, your original patch (8f46cca1e6c06) is needed in 4.12/4.13, but
they should be reverted in 4.1/4.4-stable branch.
Huacai
On Wed, Aug 30, 2017 at 9:24 PM, Matt Redfearn wrote:
> Hi Huacai,
>
> On 29/08/17 02:43, Huacai Chen wrote:
>>
>> I suggest to drop sync_r4k comp
dma_map_ops.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Chen
---
arch/mips/cavium-octeon/dma-octeon.c | 3 ++-
arch/mips/loongson64/common/dma-swiotlb.c | 1 +
arch/mips/mm/dma-default.c| 3 ++-
arch/mips/netlogic/common/nlm-dma.c | 3 ++-
include/linux/dma-mapping.h
)
Step 3, dma_from_device
Step 4, dma_unmap_single
If a DMA buffer and a kernel structure share a same cache line, and if
the kernel structure has dirty data, cache_invalidate (no writeback)
will cause data lost.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Chen
---
mm/dmapool.c
eback)
Step 3, dma_from_device
Step 4, dma_unmap_single
If a DMA buffer and a kernel structure share a same cache line, and if
the kernel structure has dirty data, cache_invalidate (no writeback)
will cause data lost.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Chen
---
drivers
We will use device_is_coherent() as a helper function, which will be
used in the next patch.
There is a MIPS-specific plat_device_is_coherent(), but we need a more
generic solution, so add and use a new function pointer in dma_map_ops.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Chen
Make dma_get_cache_alignment() to accept a 'dev' argument. As a result,
it can return different alignments due to different devices' I/O cache
coherency. For compatibility, make all existing callers pass a NULL dev
argument.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Che
eback)
Step 3, dma_from_device
Step 4, dma_unmap_single
If a DMA buffer and a kernel structure share a same cache line, and if
the kernel structure has dirty data, cache_invalidate (no writeback)
will cause data lost.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Chen
---
drivers
We will use plat_device_is_coherent() in generic cases, but it is
MIPS-specific now. So we provide a default implementation.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Chen
---
arch/mips/include/asm/dma-mapping.h | 1 +
include/linux/dma-mapping.h | 8
2 files changed, 9
In non-coherent DMA mode, kernel uses cache flushing operations to
maintain I/O coherency, so the dmapool objects should be aligned to
ARCH_DMA_MINALIGN.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Chen
---
mm/dmapool.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm/dmapool.c b
In non-coherent DMA mode, kernel uses cache flushing operations to
maintain I/O coherency, so scsi's block queue should be aligned to
ARCH_DMA_MINALIGN.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Chen
---
drivers/scsi/scsi_lib.c | 9 ++---
1 file changed, 6 insertions(+), 3 dele
In non-coherent DMA mode, kernel uses cache flushing operations to
maintain I/O coherency, so the dmapool objects should be aligned to
ARCH_DMA_MINALIGN.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Chen
---
mm/dmapool.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm/dmapool.c b
In non-coherent DMA mode, kernel uses cache flushing operations to
maintain I/O coherency, so scsi's block queue should be aligned to
ARCH_DMA_MINALIGN.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Chen
---
drivers/scsi/scsi_lib.c | 9 ++---
1 file changed, 6 insertions(+), 3 dele
3.16 doesn't need this, because 3.16 doesn't support Loongson-3 R2/R3.
Huacai
On Fri, Aug 18, 2017 at 9:13 PM, Ben Hutchings wrote:
> 3.16.47-rc1 review patch. If anyone has any objections, please let me know.
>
> ------
>
> From
eback)
Step 3, dma_from_device
Step 4, dma_unmap_single
If a DMA buffer and a kernel structure share a same cache line, and if
the kernel structure has dirty data, cache_invalidate (no writeback)
will cause data lost.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Chen
---
drivers
he future, so add a
new get_cache_alignment() function pointer in 'struct dma_map_ops' as a
generic solution.
For compatibility (always return ARCH_DMA_MINALIGN), make all existing
callers pass a NULL dev argument to dma_get_cache_alignment().
Cc: sta...@vger.kernel.org
Signed-off-by
OK, I'll update my patch and set it at runtime.
Huacai
On Thu, Jun 15, 2017 at 9:15 PM, Marc Zyngier wrote:
> Thanks Ralf.
>
> On 15/06/17 12:41, Ralf Baechle wrote:
>> On Thu, Jun 15, 2017 at 10:31:05AM +0800, Huacai Chen wrote:
>>
>>> With this patch we can
Hi, Linus, Stephen, Greg, Ralf and James,
We are kernel developers from Lemote Inc. and Loongson community. We
have already made some contributions in Linux kernel, but we hope we
can do more works.
Of course Loongson is a sub-arch in MIPS, but linux-mips community is
so inactive (Maybe maintaine
Add Jiaxun Yang as the MIPS/Loongson-2 maintainer and add Huacai Chen
as the MIPS/Loongson-3 maintainer.
Signed-off-by: Huacai Chen
Signed-off-by: Jiaxun Yang
---
MAINTAINERS | 20
1 file changed, 20 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index cdd6365
a SAS expander.
Fix this by ensuring that the rps_resp buffer is cacheline aligned.
This issue is similar to that fixed by Commit 84bda12af31f93 ("libata:
align ap->sector_buf") and Commit 4ee34ea3a12396f35b26 ("libata: Align
ata_device's id on a cacheline").
Cc: sta...@vger
n
Cc: Andy Gross
Cc: Mark A. Greer
Cc: Robert Baldyga
Cc: Marek Szyprowski
Signed-off-by: Huacai Chen
---
drivers/infiniband/hw/mthca/mthca_main.c | 2 +-
drivers/media/v4l2-core/videobuf2-dma-contig.c | 2 +-
drivers/net/ethernet/broadcom/b44.c| 8 +-
drivers
Currently, MIPS is an architecture which support coherent & noncoherent
devices co-exist. So implement get_cache_alignment() function pointer
in 'struct dma_map_ops' to return different dma alignments.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Chen
---
arch/mips/cav
e (no writeback) will cause data corruption.
Cc: sta...@vger.kernel.org
Signed-off-by: Huacai Chen
---
drivers/scsi/scsi_lib.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 9cf6a80..19abc2e 100644
--- a/drivers
Hi, James,
Of course we don't want to send PR directly, if there is a better way.
So, I hope you can officially be a co-maintainer of linux-mips, and as
a result, our community will become more active. I think most of MIPS
developers have the same will as me.
Huacai
On Fri, Dec 8, 2017 at 3:51 P
Hi, Thomas,
I can take this patch to the loongarch tree, but I think others should
get upstream via kselftests tree?
Huacai
On Mon, Oct 14, 2024 at 7:36 PM Thomas Weißschuh
wrote:
>
> Not all tasks have a vDSO mapped, for example kthreads never do.
> If such a task ever ends up calling stack_to
On Tue, Oct 15, 2024 at 2:14 PM Thomas Weißschuh
wrote:
>
> Hi Huacai,
>
> On Tue, Oct 15, 2024 at 10:15:39AM +0800, Huacai Chen wrote:
> > I can take this patch to the loongarch tree, but I think others should
> > get upstream via kselftests tree?
>
> Yes, sounds go
> > On Wed, Sep 11 2024 at 17:11, Huacai Chen wrote:
> >> Hi, Thomas,
> >>
> >> On Fri, Aug 30, 2024 at 5:32 PM Bibo Mao wrote:
> >>>
> >>> Interrupts can be routed to maximal four virtual CPUs with one HW
> >>> EIOINTC interr
Hi, Bibo,
On Wed, Apr 16, 2025 at 11:55 AM Bibo Mao wrote:
>
> Add KVM selftests header files for LoongArch, including processor.h
> and kvm_util_base.h. It mainly contains LoongArch CSR register
> definition and page table entry definition.
>
> Signed-off-by: Bibo Mao
> ---
> .../testing/selft
Hi, Bibo,
On Wed, Apr 16, 2025 at 11:55 AM Bibo Mao wrote:
>
> Add core KVM selftests support for LoongArch, it includes exception
> handler, mmu page table setup and vCPU startup entry support.
>
> Signed-off-by: Bibo Mao
> ---
> .../selftests/kvm/lib/loongarch/exception.S | 59 +++
> .../s
Hi, Thomas,
On Mon, Apr 14, 2025 at 4:29 PM Thomas Weißschuh
wrote:
>
> Not all tasks have an ABI associated or vDSO mapped,
> for example kthreads never do.
> If such a task ever ends up calling stack_top(), it will derefence the
> NULL vdso pointer and crash.
>
> This can for example happen whe
Hi, Bibo,
On Thu, Apr 10, 2025 at 11:57 AM Bibo Mao wrote:
>
> Add KVM selftests header files for LoongArch, including processor.h
> and kvm_util_base.h. It mainly contains LoongArch CSR register
> definition and page table entry definition.
>
> Signed-off-by: Bibo Mao
> ---
> .../testing/selft
Hi, Thomas,
On Tue, Apr 15, 2025 at 3:10 PM Thomas Weißschuh
wrote:
>
> Not all tasks have an ABI associated or vDSO mapped,
> for example kthreads never do.
> If such a task ever ends up calling stack_top(), it will derefence the
> NULL ABI pointer and crash.
>
> This can for example happen when
Hi, Bibo,
On Sun, Apr 27, 2025 at 2:45 PM Bibo Mao wrote:
>
> Add core KVM selftests support for LoongArch, it includes exception
> handler, mmu page table setup and vCPU startup entry support.
>
> Signed-off-by: Bibo Mao
> ---
> .../selftests/kvm/lib/loongarch/exception.S | 59 +++
> .../se
Hi, Bibo,
On Sun, Apr 27, 2025 at 2:45 PM Bibo Mao wrote:
>
> This patchset adds KVM selftests for LoongArch system, currently only
> some common test cases are supported and pass to run. These test cases
> are listed as following:
> coalesced_io_test
> demand_paging_test
> dirty_log_
; F: arch/loongarch/include/asm/kvm*
> F: arch/loongarch/include/uapi/asm/kvm*
> F: arch/loongarch/kvm/
> +F: tools/testing/selftests/kvm/*/loongarch/
> +F: tools/testing/selftests/kvm/lib/loongarch/
>
> KERNEL VIRTUAL MACHINE FOR MIPS (KVM/mips)
> M:
Reviewed-by: Huacai Chen
On Wed, Jun 11, 2025 at 7:28 PM Thomas Weißschuh
wrote:
>
> Not all tasks have an ABI associated or vDSO mapped,
> for example kthreads never do.
> If such a task ever ends up calling stack_top(), it will derefence the
> NULL ABI pointer and crash.
&
The following commit has been merged into the irq/irqchip-next branch of
irqchip:
Commit-ID: c1f664d2400e73d5ca0fcd067fa5847d2c789c11
Gitweb:
https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/c1f664d2400e73d5ca0fcd067fa5847d2c789c11
Author:Huacai Chen
The following commit has been merged into the irq/irqchip-next branch of
irqchip:
Commit-ID: 3ee36352e26935c7e8145eb4e7ed38b536ca01fc
Gitweb:
https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/3ee36352e26935c7e8145eb4e7ed38b536ca01fc
Author:Huacai Chen
The following commit has been merged into the irq/irqchip-next branch of
irqchip:
Commit-ID: 4cc99d03757df10a4064ba28bf6021406b04d6a9
Gitweb:
https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/4cc99d03757df10a4064ba28bf6021406b04d6a9
Author:Huacai Chen
Commit-ID: 12fee4cd5be2c4a73cc13d7ad76eb2d2feda8a71
Gitweb: https://git.kernel.org/tip/12fee4cd5be2c4a73cc13d7ad76eb2d2feda8a71
Author: Huacai Chen
AuthorDate: Thu, 17 Jan 2019 11:00:09 +0800
Committer: Thomas Gleixner
CommitDate: Fri, 18 Jan 2019 00:43:09 +0100
genirq/irqdesc: Fix
The following commit has been merged into the irq/core branch of tip:
Commit-ID: 1d1e5630de78f7253ac24b92cee6427c3ff04d56
Gitweb:
https://git.kernel.org/tip/1d1e5630de78f7253ac24b92cee6427c3ff04d56
Author:Huacai Chen
AuthorDate:Fri, 11 Sep 2020 18:26:18 +08:00
Committer
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