diff mbox series

[V4,05/23] ACPI: OSL: Make should_use_kmap() 0 for RISC-V

Message ID 20230404182037.863533-6-sunilvl@ventanamicro.com
State New
Headers
Series Add basic ACPI support for RISC-V |

Commit Message

Sunil V L April 4, 2023, 6:20 p.m. UTC 
  Without this, if the tables are larger than 4K,
acpi_map() will fail.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/osl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Björn Töpel April 26, 2023, 4:47 p.m. UTC | #1 
Sunil V L <sunilvl@ventanamicro.com> writes:

> Without this, if the tables are larger than 4K,
> acpi_map() will fail.
>
> Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> ---
>  drivers/acpi/osl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index 3269a888fb7a..f725813d0cce 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -276,7 +276,7 @@ acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
>  	return NULL;
>  }
>  
> -#if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
> +#if defined(CONFIG_IA64) || defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
>  /* ioremap will take care of cache attributes */
>  #define should_use_kmap(pfn)   0

An observation, which can be addressed later; The acpi_os_ioremap()
(called when the config above is enabled for RV), does not have an arch
specific implementation for RISC-V. The generic one calls
ioremap_cached(), which on RISC-V defaults to ioremap() -- caching
disabled/_PAGE_IO.

That is probably not what we want, but rather something similar that
arm64 does.


Björn
Sunil V L April 27, 2023, 9:27 a.m. UTC | #2 
Hi Bjorn,

On Wed, Apr 26, 2023 at 06:47:20PM +0200, Björn Töpel wrote:
> Sunil V L <sunilvl@ventanamicro.com> writes:
> 
> > Without this, if the tables are larger than 4K,
> > acpi_map() will fail.
> >
> > Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > ---
> >  drivers/acpi/osl.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> > index 3269a888fb7a..f725813d0cce 100644
> > --- a/drivers/acpi/osl.c
> > +++ b/drivers/acpi/osl.c
> > @@ -276,7 +276,7 @@ acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
> >  	return NULL;
> >  }
> >  
> > -#if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
> > +#if defined(CONFIG_IA64) || defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
> >  /* ioremap will take care of cache attributes */
> >  #define should_use_kmap(pfn)   0
> 
> An observation, which can be addressed later; The acpi_os_ioremap()
> (called when the config above is enabled for RV), does not have an arch
> specific implementation for RISC-V. The generic one calls
> ioremap_cached(), which on RISC-V defaults to ioremap() -- caching
> disabled/_PAGE_IO.
> 
> That is probably not what we want, but rather something similar that
> arm64 does.
> 
Actually, for RISC-V acpi_os_ioremap() is currently a wrapper around
memremap(). Sure, this can be enhanced in future if required.

Thanks,
Sunil
Björn Töpel April 27, 2023, 11:24 a.m. UTC | #3 
Sunil V L <sunilvl@ventanamicro.com> writes:

>> An observation, which can be addressed later; The acpi_os_ioremap()
>> (called when the config above is enabled for RV), does not have an arch
>> specific implementation for RISC-V. The generic one calls
>> ioremap_cached(), which on RISC-V defaults to ioremap() -- caching
>> disabled/_PAGE_IO.
>> 
>> That is probably not what we want, but rather something similar that
>> arm64 does.
>> 
> Actually, for RISC-V acpi_os_ioremap() is currently a wrapper around
> memremap(). Sure, this can be enhanced in future if required.

Yeah, realized that when I continued thru the series!

Thanks for clearing it up!
diff mbox series

Patch

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 3269a888fb7a..f725813d0cce 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -276,7 +276,7 @@  acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
 	return NULL;
 }
 
-#if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
+#if defined(CONFIG_IA64) || defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
 /* ioremap will take care of cache attributes */
 #define should_use_kmap(pfn)   0
 #else