2019-08-07 15:12:53

by Christoph Hellwig

[permalink] [raw]
Subject: [PATCH] riscv: move sifive_l2_cache.c to drivers/misc

The sifive_l2_cache.c is in no way related to RISC-V architecture
memory management. It is a little stub driver working around the fact
that the EDAC maintainers prefer their drivers to be structured in a
certain way that doesn't fit the SiFive SOCs.

Move the file to drivers/misc and only build it when the EDAC_SIFIVE
config option is selected.

Fixes: a967a289f169 ("RISC-V: sifive_l2_cache: Add L2 cache controller driver for SiFive SoCs")
Signed-off-by: Christoph Hellwig <[email protected]>
---
arch/riscv/mm/Makefile | 1 -
drivers/misc/Makefile | 1 +
{arch/riscv/mm => drivers/misc}/sifive_l2_cache.c | 0
3 files changed, 1 insertion(+), 1 deletion(-)
rename {arch/riscv/mm => drivers/misc}/sifive_l2_cache.c (100%)

diff --git a/arch/riscv/mm/Makefile b/arch/riscv/mm/Makefile
index 74055e1d6f21..d2101d0741d4 100644
--- a/arch/riscv/mm/Makefile
+++ b/arch/riscv/mm/Makefile
@@ -11,6 +11,5 @@ obj-y += extable.o
obj-y += ioremap.o
obj-y += cacheflush.o
obj-y += context.o
-obj-y += sifive_l2_cache.o

obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index abd8ae249746..886d48301e8e 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -59,3 +59,4 @@ obj-y += cardreader/
obj-$(CONFIG_PVPANIC) += pvpanic.o
obj-$(CONFIG_HABANA_AI) += habanalabs/
obj-$(CONFIG_XILINX_SDFEC) += xilinx_sdfec.o
+obj-$(CONFIG_EDAC_SIFIVE) += sifive_l2_cache.o
diff --git a/arch/riscv/mm/sifive_l2_cache.c b/drivers/misc/sifive_l2_cache.c
similarity index 100%
rename from arch/riscv/mm/sifive_l2_cache.c
rename to drivers/misc/sifive_l2_cache.c
--
2.20.1


2019-08-07 15:25:07

by Greg Kroah-Hartman

[permalink] [raw]
Subject: Re: [PATCH] riscv: move sifive_l2_cache.c to drivers/misc

On Wed, Aug 07, 2019 at 06:10:09PM +0300, Christoph Hellwig wrote:
> The sifive_l2_cache.c is in no way related to RISC-V architecture
> memory management. It is a little stub driver working around the fact
> that the EDAC maintainers prefer their drivers to be structured in a
> certain way that doesn't fit the SiFive SOCs.
>
> Move the file to drivers/misc and only build it when the EDAC_SIFIVE
> config option is selected.
>
> Fixes: a967a289f169 ("RISC-V: sifive_l2_cache: Add L2 cache controller driver for SiFive SoCs")
> Signed-off-by: Christoph Hellwig <[email protected]>
> ---
> arch/riscv/mm/Makefile | 1 -
> drivers/misc/Makefile | 1 +
> {arch/riscv/mm => drivers/misc}/sifive_l2_cache.c | 0
> 3 files changed, 1 insertion(+), 1 deletion(-)
> rename {arch/riscv/mm => drivers/misc}/sifive_l2_cache.c (100%)

Why isn't this in drivers/edac/ ?
why is this a misc driver? Seems like it should sit next to the edac
stuff.

thanks,

greg k-h

2019-08-07 15:26:28

by Christoph Hellwig

[permalink] [raw]
Subject: Re: [PATCH] riscv: move sifive_l2_cache.c to drivers/misc

On Wed, Aug 07, 2019 at 05:22:15PM +0200, Greg KH wrote:
> > Fixes: a967a289f169 ("RISC-V: sifive_l2_cache: Add L2 cache controller driver for SiFive SoCs")
> > Signed-off-by: Christoph Hellwig <[email protected]>
> > ---
> > arch/riscv/mm/Makefile | 1 -
> > drivers/misc/Makefile | 1 +
> > {arch/riscv/mm => drivers/misc}/sifive_l2_cache.c | 0
> > 3 files changed, 1 insertion(+), 1 deletion(-)
> > rename {arch/riscv/mm => drivers/misc}/sifive_l2_cache.c (100%)
>
> Why isn't this in drivers/edac/ ?
> why is this a misc driver? Seems like it should sit next to the edac
> stuff.

No idea. EDAC maintainers, would you object to taking what is
currently in arch/riscv/mm//sifive_l2_cache.c to drivers/edac/ ?

2019-08-07 15:42:30

by Paul Walmsley

[permalink] [raw]
Subject: Re: [PATCH] riscv: move sifive_l2_cache.c to drivers/misc

On Wed, 7 Aug 2019, Christoph Hellwig wrote:

> On Wed, Aug 07, 2019 at 05:22:15PM +0200, Greg KH wrote:
> > > Fixes: a967a289f169 ("RISC-V: sifive_l2_cache: Add L2 cache controller driver for SiFive SoCs")
> > > Signed-off-by: Christoph Hellwig <[email protected]>
> > > ---
> > > arch/riscv/mm/Makefile | 1 -
> > > drivers/misc/Makefile | 1 +
> > > {arch/riscv/mm => drivers/misc}/sifive_l2_cache.c | 0
> > > 3 files changed, 1 insertion(+), 1 deletion(-)
> > > rename {arch/riscv/mm => drivers/misc}/sifive_l2_cache.c (100%)
> >
> > Why isn't this in drivers/edac/ ?
> > why is this a misc driver? Seems like it should sit next to the edac
> > stuff.
>
> No idea. EDAC maintainers, would you object to taking what is
> currently in arch/riscv/mm//sifive_l2_cache.c to drivers/edac/ ?

If this driver is moved out of arch/riscv/mm, it should ideally go into
some sort of common L2 cache controller driver directory, along
with other L2 cache controller drivers like arch/arm/mm/*l2c*.

Like many L2 cache controllers, this controller also supports cache
flushing operations and SoC-specific way operations. We just don't use
those on RISC-V - yet.


- Paul

2019-08-08 07:51:37

by Christoph Hellwig

[permalink] [raw]
Subject: Re: [PATCH] riscv: move sifive_l2_cache.c to drivers/misc

On Wed, Aug 07, 2019 at 08:40:58AM -0700, Paul Walmsley wrote:
> On Wed, 7 Aug 2019, Christoph Hellwig wrote:
>
> > On Wed, Aug 07, 2019 at 05:22:15PM +0200, Greg KH wrote:
> > > > Fixes: a967a289f169 ("RISC-V: sifive_l2_cache: Add L2 cache controller driver for SiFive SoCs")
> > > > Signed-off-by: Christoph Hellwig <[email protected]>
> > > > ---
> > > > arch/riscv/mm/Makefile | 1 -
> > > > drivers/misc/Makefile | 1 +
> > > > {arch/riscv/mm => drivers/misc}/sifive_l2_cache.c | 0
> > > > 3 files changed, 1 insertion(+), 1 deletion(-)
> > > > rename {arch/riscv/mm => drivers/misc}/sifive_l2_cache.c (100%)
> > >
> > > Why isn't this in drivers/edac/ ?
> > > why is this a misc driver? Seems like it should sit next to the edac
> > > stuff.
> >
> > No idea. EDAC maintainers, would you object to taking what is
> > currently in arch/riscv/mm//sifive_l2_cache.c to drivers/edac/ ?
>
> If this driver is moved out of arch/riscv/mm, it should ideally go into
> some sort of common L2 cache controller driver directory, along
> with other L2 cache controller drivers like arch/arm/mm/*l2c*.
>
> Like many L2 cache controllers, this controller also supports cache
> flushing operations and SoC-specific way operations. We just don't use
> those on RISC-V - yet.

Well, another reason to not have it under arch/riscv/ as it is a SOC
specific driver, which we all have somewhere else, just like arm64
and new arm ports do. And especially not unconditionally built.

2019-08-08 08:08:51

by Arnd Bergmann

[permalink] [raw]
Subject: Re: [PATCH] riscv: move sifive_l2_cache.c to drivers/misc

On Thu, Aug 8, 2019 at 9:50 AM Christoph Hellwig <[email protected]> wrote:
> On Wed, Aug 07, 2019 at 08:40:58AM -0700, Paul Walmsley wrote:
> > On Wed, 7 Aug 2019, Christoph Hellwig wrote:
> > > On Wed, Aug 07, 2019 at 05:22:15PM +0200, Greg KH wrote:
> > > > > Fixes: a967a289f169 ("RISC-V: sifive_l2_cache: Add L2 cache controller driver for SiFive SoCs")
> > > > > Signed-off-by: Christoph Hellwig <[email protected]>
> > > > > ---
> > > > > arch/riscv/mm/Makefile | 1 -
> > > > > drivers/misc/Makefile | 1 +
> > > > > {arch/riscv/mm => drivers/misc}/sifive_l2_cache.c | 0
> > > > > 3 files changed, 1 insertion(+), 1 deletion(-)
> > > > > rename {arch/riscv/mm => drivers/misc}/sifive_l2_cache.c (100%)
> > > >
> > > > Why isn't this in drivers/edac/ ?
> > > > why is this a misc driver? Seems like it should sit next to the edac
> > > > stuff.
> > >
> > > No idea. EDAC maintainers, would you object to taking what is
> > > currently in arch/riscv/mm//sifive_l2_cache.c to drivers/edac/ ?
> >
> > If this driver is moved out of arch/riscv/mm, it should ideally go into
> > some sort of common L2 cache controller driver directory, along
> > with other L2 cache controller drivers like arch/arm/mm/*l2c*.
> >
> > Like many L2 cache controllers, this controller also supports cache
> > flushing operations and SoC-specific way operations. We just don't use
> > those on RISC-V - yet.
>
> Well, another reason to not have it under arch/riscv/ as it is a SOC
> specific driver, which we all have somewhere else, just like arm64
> and new arm ports do. And especially not unconditionally built.

soc specific drivers that don't have their own subsystem can
go into drivers/soc/$VENDOR/.

For this driver, I would also think that the edac subsystem is the
best fit. Right now, the driver is split in two halves: there
is drivers/edac/sifive_edac.c and arch/riscv/mm/sifive_l2_cache.c,
with neither of those working without the other.

Moving both into a single file would seem to allow simplifying
it as a proper 'platform_driver', which the drivers/edac side today
is not (it just registers a platform device in its module_init call).

Arnd