diff mbox series

[4/4] ACPI: PM: Avoid cache flush on entering S4

Message ID 20211206122952.74139-5-kirill.shutemov@linux.intel.com
State Accepted
Commit 53d01e2016d77ff647fb2056c39c67df18ee86bf
Headers show
Series ACPI/ACPICA: Only flush caches on S1/S2/S3 and C3 | expand

Commit Message

Kirill A. Shutemov Dec. 6, 2021, 12:29 p.m. UTC
According to the ACPI spec v6.4, section 16.2 the cache flushing
required on entering to S1, S2, and S3.

No need to flush caches on hibernation (S4).

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 drivers/acpi/sleep.c | 2 --
 1 file changed, 2 deletions(-)

Comments

Rafael J. Wysocki Dec. 8, 2021, 3:10 p.m. UTC | #1
On Mon, Dec 6, 2021 at 1:30 PM Kirill A. Shutemov
<kirill.shutemov@linux.intel.com> wrote:
>
> According to the ACPI spec v6.4, section 16.2 the cache flushing
> required on entering to S1, S2, and S3.
>
> No need to flush caches on hibernation (S4).
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> ---
>  drivers/acpi/sleep.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
> index 14e8df0ac762..8166d863ed6b 100644
> --- a/drivers/acpi/sleep.c
> +++ b/drivers/acpi/sleep.c
> @@ -902,8 +902,6 @@ static int acpi_hibernation_enter(void)
>  {
>         acpi_status status = AE_OK;
>
> -       ACPI_FLUSH_CPU_CACHE();
> -
>         /* This shouldn't return.  If it returns, we have a problem */
>         status = acpi_enter_sleep_state(ACPI_STATE_S4);
>         /* Reprogram control registers */
> --

Applied (with some edits in the subject and changelog) as 5.17 material, thanks!
Kirill A. Shutemov Dec. 8, 2021, 4:04 p.m. UTC | #2
On Wed, Dec 08, 2021 at 04:10:52PM +0100, Rafael J. Wysocki wrote:
> On Mon, Dec 6, 2021 at 1:30 PM Kirill A. Shutemov
> <kirill.shutemov@linux.intel.com> wrote:
> >
> > According to the ACPI spec v6.4, section 16.2 the cache flushing
> > required on entering to S1, S2, and S3.
> >
> > No need to flush caches on hibernation (S4).
> >
> > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> > ---
> >  drivers/acpi/sleep.c | 2 --
> >  1 file changed, 2 deletions(-)
> >
> > diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
> > index 14e8df0ac762..8166d863ed6b 100644
> > --- a/drivers/acpi/sleep.c
> > +++ b/drivers/acpi/sleep.c
> > @@ -902,8 +902,6 @@ static int acpi_hibernation_enter(void)
> >  {
> >         acpi_status status = AE_OK;
> >
> > -       ACPI_FLUSH_CPU_CACHE();
> > -
> >         /* This shouldn't return.  If it returns, we have a problem */
> >         status = acpi_enter_sleep_state(ACPI_STATE_S4);
> >         /* Reprogram control registers */
> > --
> 
> Applied (with some edits in the subject and changelog) as 5.17 material, thanks!

Is it for the series or only 4/4? Do I need to do something for 2/4 and
3/4?
Rafael J. Wysocki Dec. 8, 2021, 4:16 p.m. UTC | #3
On Wed, Dec 8, 2021 at 5:04 PM Kirill A. Shutemov
<kirill.shutemov@linux.intel.com> wrote:
>
> On Wed, Dec 08, 2021 at 04:10:52PM +0100, Rafael J. Wysocki wrote:
> > On Mon, Dec 6, 2021 at 1:30 PM Kirill A. Shutemov
> > <kirill.shutemov@linux.intel.com> wrote:
> > >
> > > According to the ACPI spec v6.4, section 16.2 the cache flushing
> > > required on entering to S1, S2, and S3.
> > >
> > > No need to flush caches on hibernation (S4).
> > >
> > > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> > > ---
> > >  drivers/acpi/sleep.c | 2 --
> > >  1 file changed, 2 deletions(-)
> > >
> > > diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
> > > index 14e8df0ac762..8166d863ed6b 100644
> > > --- a/drivers/acpi/sleep.c
> > > +++ b/drivers/acpi/sleep.c
> > > @@ -902,8 +902,6 @@ static int acpi_hibernation_enter(void)
> > >  {
> > >         acpi_status status = AE_OK;
> > >
> > > -       ACPI_FLUSH_CPU_CACHE();
> > > -
> > >         /* This shouldn't return.  If it returns, we have a problem */
> > >         status = acpi_enter_sleep_state(ACPI_STATE_S4);
> > >         /* Reprogram control registers */
> > > --
> >
> > Applied (with some edits in the subject and changelog) as 5.17 material, thanks!
>
> Is it for the series or only 4/4?

Just for the [4/4].

> Do I need to do something for 2/4 and 3/4?

For [2/4] you do as per the comment and let me reply to the [3/4].
diff mbox series

Patch

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 14e8df0ac762..8166d863ed6b 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -902,8 +902,6 @@  static int acpi_hibernation_enter(void)
 {
 	acpi_status status = AE_OK;
 
-	ACPI_FLUSH_CPU_CACHE();
-
 	/* This shouldn't return.  If it returns, we have a problem */
 	status = acpi_enter_sleep_state(ACPI_STATE_S4);
 	/* Reprogram control registers */