diff mbox series

[04/18] PCI: Add PCI_EXP_SLTCAP_*_SHIFT macros

Message ID 20220220193346.23789-5-kabel@kernel.org (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show
Series PCI: aardvark controller changes BATCH 5 | expand

Commit Message

Marek Behún Feb. 20, 2022, 7:33 p.m. UTC 
From: Pali Rohár <pali@kernel.org>

These macros allows to easily compose and extract Slot Power Limit and
Physical Slot Number values from Slot Capability Register.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
---
 include/uapi/linux/pci_regs.h | 3 +++
 1 file changed, 3 insertions(+)

Comments

Lorenzo Pieralisi April 28, 2022, 11:09 a.m. UTC | #1 
On Sun, Feb 20, 2022 at 08:33:32PM +0100, Marek Behún wrote:
> From: Pali Rohár <pali@kernel.org>
> 
> These macros allows to easily compose and extract Slot Power Limit and
> Physical Slot Number values from Slot Capability Register.
> 
> Signed-off-by: Pali Rohár <pali@kernel.org>
> Signed-off-by: Marek Behún <kabel@kernel.org>
> ---
>  include/uapi/linux/pci_regs.h | 3 +++
>  1 file changed, 3 insertions(+)

This patch can be dropped, correct ?

Thanks,
Lorenzo

> 
> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> index bee1a9ed6e66..d825e17e448c 100644
> --- a/include/uapi/linux/pci_regs.h
> +++ b/include/uapi/linux/pci_regs.h
> @@ -591,10 +591,13 @@
>  #define  PCI_EXP_SLTCAP_HPS	0x00000020 /* Hot-Plug Surprise */
>  #define  PCI_EXP_SLTCAP_HPC	0x00000040 /* Hot-Plug Capable */
>  #define  PCI_EXP_SLTCAP_SPLV	0x00007f80 /* Slot Power Limit Value */
> +#define  PCI_EXP_SLTCAP_SPLV_SHIFT	7  /* Slot Power Limit Value shift */
>  #define  PCI_EXP_SLTCAP_SPLS	0x00018000 /* Slot Power Limit Scale */
> +#define  PCI_EXP_SLTCAP_SPLS_SHIFT	15 /* Slot Power Limit Scale shift */
>  #define  PCI_EXP_SLTCAP_EIP	0x00020000 /* Electromechanical Interlock Present */
>  #define  PCI_EXP_SLTCAP_NCCS	0x00040000 /* No Command Completed Support */
>  #define  PCI_EXP_SLTCAP_PSN	0xfff80000 /* Physical Slot Number */
> +#define  PCI_EXP_SLTCAP_PSN_SHIFT	19 /* Physical Slot Number shift */
>  #define PCI_EXP_SLTCTL		0x18	/* Slot Control */
>  #define  PCI_EXP_SLTCTL_ABPE	0x0001	/* Attention Button Pressed Enable */
>  #define  PCI_EXP_SLTCTL_PFDE	0x0002	/* Power Fault Detected Enable */
> -- 
> 2.34.1
>
Pali Rohár April 28, 2022, 11:16 a.m. UTC | #2 
On Thursday 28 April 2022 12:09:26 Lorenzo Pieralisi wrote:
> On Sun, Feb 20, 2022 at 08:33:32PM +0100, Marek Behún wrote:
> > From: Pali Rohár <pali@kernel.org>
> > 
> > These macros allows to easily compose and extract Slot Power Limit and
> > Physical Slot Number values from Slot Capability Register.
> > 
> > Signed-off-by: Pali Rohár <pali@kernel.org>
> > Signed-off-by: Marek Behún <kabel@kernel.org>
> > ---
> >  include/uapi/linux/pci_regs.h | 3 +++
> >  1 file changed, 3 insertions(+)
> 
> This patch can be dropped, correct ?

Yes!

And note that 'slot-power-limit-milliwatt' DT property patch you took
into pci/power-slot branch.

> Thanks,
> Lorenzo
> 
> > 
> > diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> > index bee1a9ed6e66..d825e17e448c 100644
> > --- a/include/uapi/linux/pci_regs.h
> > +++ b/include/uapi/linux/pci_regs.h
> > @@ -591,10 +591,13 @@
> >  #define  PCI_EXP_SLTCAP_HPS	0x00000020 /* Hot-Plug Surprise */
> >  #define  PCI_EXP_SLTCAP_HPC	0x00000040 /* Hot-Plug Capable */
> >  #define  PCI_EXP_SLTCAP_SPLV	0x00007f80 /* Slot Power Limit Value */
> > +#define  PCI_EXP_SLTCAP_SPLV_SHIFT	7  /* Slot Power Limit Value shift */
> >  #define  PCI_EXP_SLTCAP_SPLS	0x00018000 /* Slot Power Limit Scale */
> > +#define  PCI_EXP_SLTCAP_SPLS_SHIFT	15 /* Slot Power Limit Scale shift */
> >  #define  PCI_EXP_SLTCAP_EIP	0x00020000 /* Electromechanical Interlock Present */
> >  #define  PCI_EXP_SLTCAP_NCCS	0x00040000 /* No Command Completed Support */
> >  #define  PCI_EXP_SLTCAP_PSN	0xfff80000 /* Physical Slot Number */
> > +#define  PCI_EXP_SLTCAP_PSN_SHIFT	19 /* Physical Slot Number shift */
> >  #define PCI_EXP_SLTCTL		0x18	/* Slot Control */
> >  #define  PCI_EXP_SLTCTL_ABPE	0x0001	/* Attention Button Pressed Enable */
> >  #define  PCI_EXP_SLTCTL_PFDE	0x0002	/* Power Fault Detected Enable */
> > -- 
> > 2.34.1
> >
Bjorn Helgaas May 18, 2022, 7:23 p.m. UTC | #3 
On Sun, Feb 20, 2022 at 08:33:32PM +0100, Marek Behún wrote:
> From: Pali Rohár <pali@kernel.org>
> 
> These macros allows to easily compose and extract Slot Power Limit and
> Physical Slot Number values from Slot Capability Register.
> 
> Signed-off-by: Pali Rohár <pali@kernel.org>
> Signed-off-by: Marek Behún <kabel@kernel.org>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

We talked about using FIELD_PREP() / FIELD_GET(), which I think would
remove the need for the *_SHIFT macros.  But we can always do that
later.

> ---
>  include/uapi/linux/pci_regs.h | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> index bee1a9ed6e66..d825e17e448c 100644
> --- a/include/uapi/linux/pci_regs.h
> +++ b/include/uapi/linux/pci_regs.h
> @@ -591,10 +591,13 @@
>  #define  PCI_EXP_SLTCAP_HPS	0x00000020 /* Hot-Plug Surprise */
>  #define  PCI_EXP_SLTCAP_HPC	0x00000040 /* Hot-Plug Capable */
>  #define  PCI_EXP_SLTCAP_SPLV	0x00007f80 /* Slot Power Limit Value */
> +#define  PCI_EXP_SLTCAP_SPLV_SHIFT	7  /* Slot Power Limit Value shift */
>  #define  PCI_EXP_SLTCAP_SPLS	0x00018000 /* Slot Power Limit Scale */
> +#define  PCI_EXP_SLTCAP_SPLS_SHIFT	15 /* Slot Power Limit Scale shift */
>  #define  PCI_EXP_SLTCAP_EIP	0x00020000 /* Electromechanical Interlock Present */
>  #define  PCI_EXP_SLTCAP_NCCS	0x00040000 /* No Command Completed Support */
>  #define  PCI_EXP_SLTCAP_PSN	0xfff80000 /* Physical Slot Number */
> +#define  PCI_EXP_SLTCAP_PSN_SHIFT	19 /* Physical Slot Number shift */
>  #define PCI_EXP_SLTCTL		0x18	/* Slot Control */
>  #define  PCI_EXP_SLTCTL_ABPE	0x0001	/* Attention Button Pressed Enable */
>  #define  PCI_EXP_SLTCTL_PFDE	0x0002	/* Power Fault Detected Enable */
> -- 
> 2.34.1
>
Pali Rohár May 18, 2022, 7:26 p.m. UTC | #4 
On Wednesday 18 May 2022 14:23:22 Bjorn Helgaas wrote:
> On Sun, Feb 20, 2022 at 08:33:32PM +0100, Marek Behún wrote:
> > From: Pali Rohár <pali@kernel.org>
> > 
> > These macros allows to easily compose and extract Slot Power Limit and
> > Physical Slot Number values from Slot Capability Register.
> > 
> > Signed-off-by: Pali Rohár <pali@kernel.org>
> > Signed-off-by: Marek Behún <kabel@kernel.org>
> 
> Acked-by: Bjorn Helgaas <bhelgaas@google.com>
> 
> We talked about using FIELD_PREP() / FIELD_GET(), which I think would
> remove the need for the *_SHIFT macros.  But we can always do that
> later.

I have already done this for pci-mvebu.c driver and patch was merged:
https://lore.kernel.org/linux-pci/20220412094946.27069-5-pali@kernel.org/

IIRC we have decided to not use those *_SHIFT macros as it would flood
public uapi file and from this file we cannot remove macros due to
userspace backward compatibility.

> > ---
> >  include/uapi/linux/pci_regs.h | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> > index bee1a9ed6e66..d825e17e448c 100644
> > --- a/include/uapi/linux/pci_regs.h
> > +++ b/include/uapi/linux/pci_regs.h
> > @@ -591,10 +591,13 @@
> >  #define  PCI_EXP_SLTCAP_HPS	0x00000020 /* Hot-Plug Surprise */
> >  #define  PCI_EXP_SLTCAP_HPC	0x00000040 /* Hot-Plug Capable */
> >  #define  PCI_EXP_SLTCAP_SPLV	0x00007f80 /* Slot Power Limit Value */
> > +#define  PCI_EXP_SLTCAP_SPLV_SHIFT	7  /* Slot Power Limit Value shift */
> >  #define  PCI_EXP_SLTCAP_SPLS	0x00018000 /* Slot Power Limit Scale */
> > +#define  PCI_EXP_SLTCAP_SPLS_SHIFT	15 /* Slot Power Limit Scale shift */
> >  #define  PCI_EXP_SLTCAP_EIP	0x00020000 /* Electromechanical Interlock Present */
> >  #define  PCI_EXP_SLTCAP_NCCS	0x00040000 /* No Command Completed Support */
> >  #define  PCI_EXP_SLTCAP_PSN	0xfff80000 /* Physical Slot Number */
> > +#define  PCI_EXP_SLTCAP_PSN_SHIFT	19 /* Physical Slot Number shift */
> >  #define PCI_EXP_SLTCTL		0x18	/* Slot Control */
> >  #define  PCI_EXP_SLTCTL_ABPE	0x0001	/* Attention Button Pressed Enable */
> >  #define  PCI_EXP_SLTCTL_PFDE	0x0002	/* Power Fault Detected Enable */
> > -- 
> > 2.34.1
> >
Marek Behún May 18, 2022, 8:05 p.m. UTC | #5 
On Wed, 18 May 2022 21:26:00 +0200
Pali Rohár <pali@kernel.org> wrote:

> On Wednesday 18 May 2022 14:23:22 Bjorn Helgaas wrote:
> > On Sun, Feb 20, 2022 at 08:33:32PM +0100, Marek Behún wrote:  
> > > From: Pali Rohár <pali@kernel.org>
> > > 
> > > These macros allows to easily compose and extract Slot Power Limit and
> > > Physical Slot Number values from Slot Capability Register.
> > > 
> > > Signed-off-by: Pali Rohár <pali@kernel.org>
> > > Signed-off-by: Marek Behún <kabel@kernel.org>  
> > 
> > Acked-by: Bjorn Helgaas <bhelgaas@google.com>
> > 
> > We talked about using FIELD_PREP() / FIELD_GET(), which I think would
> > remove the need for the *_SHIFT macros.  But we can always do that
> > later.  
> 
> I have already done this for pci-mvebu.c driver and patch was merged:
> https://lore.kernel.org/linux-pci/20220412094946.27069-5-pali@kernel.org/
> 
> IIRC we have decided to not use those *_SHIFT macros as it would flood
> public uapi file and from this file we cannot remove macros due to
> userspace backward compatibility.

So should I change patch 5 of the aardvark batch 5 to also use
FIELD_GET(), so that this patch is not needed?

Marek
Bjorn Helgaas May 18, 2022, 8:27 p.m. UTC | #6 
On Wed, May 18, 2022 at 10:05:56PM +0200, Marek Behún wrote:
> On Wed, 18 May 2022 21:26:00 +0200
> Pali Rohár <pali@kernel.org> wrote:
> 
> > On Wednesday 18 May 2022 14:23:22 Bjorn Helgaas wrote:
> > > On Sun, Feb 20, 2022 at 08:33:32PM +0100, Marek Behún wrote:  
> > > > From: Pali Rohár <pali@kernel.org>
> > > > 
> > > > These macros allows to easily compose and extract Slot Power Limit and
> > > > Physical Slot Number values from Slot Capability Register.
> > > > 
> > > > Signed-off-by: Pali Rohár <pali@kernel.org>
> > > > Signed-off-by: Marek Behún <kabel@kernel.org>  
> > > 
> > > Acked-by: Bjorn Helgaas <bhelgaas@google.com>
> > > 
> > > We talked about using FIELD_PREP() / FIELD_GET(), which I think would
> > > remove the need for the *_SHIFT macros.  But we can always do that
> > > later.  
> > 
> > I have already done this for pci-mvebu.c driver and patch was merged:
> > https://lore.kernel.org/linux-pci/20220412094946.27069-5-pali@kernel.org/
> > 
> > IIRC we have decided to not use those *_SHIFT macros as it would flood
> > public uapi file and from this file we cannot remove macros due to
> > userspace backward compatibility.
> 
> So should I change patch 5 of the aardvark batch 5 to also use
> FIELD_GET(), so that this patch is not needed?

That would be awesome if you could.  I forgot about the backward
compatibility issue with include/uapi/linux/pci_regs.h

Bjorn
diff mbox series

Patch

diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
index bee1a9ed6e66..d825e17e448c 100644
--- a/include/uapi/linux/pci_regs.h
+++ b/include/uapi/linux/pci_regs.h
@@ -591,10 +591,13 @@ 
 #define  PCI_EXP_SLTCAP_HPS	0x00000020 /* Hot-Plug Surprise */
 #define  PCI_EXP_SLTCAP_HPC	0x00000040 /* Hot-Plug Capable */
 #define  PCI_EXP_SLTCAP_SPLV	0x00007f80 /* Slot Power Limit Value */
+#define  PCI_EXP_SLTCAP_SPLV_SHIFT	7  /* Slot Power Limit Value shift */
 #define  PCI_EXP_SLTCAP_SPLS	0x00018000 /* Slot Power Limit Scale */
+#define  PCI_EXP_SLTCAP_SPLS_SHIFT	15 /* Slot Power Limit Scale shift */
 #define  PCI_EXP_SLTCAP_EIP	0x00020000 /* Electromechanical Interlock Present */
 #define  PCI_EXP_SLTCAP_NCCS	0x00040000 /* No Command Completed Support */
 #define  PCI_EXP_SLTCAP_PSN	0xfff80000 /* Physical Slot Number */
+#define  PCI_EXP_SLTCAP_PSN_SHIFT	19 /* Physical Slot Number shift */
 #define PCI_EXP_SLTCTL		0x18	/* Slot Control */
 #define  PCI_EXP_SLTCTL_ABPE	0x0001	/* Attention Button Pressed Enable */
 #define  PCI_EXP_SLTCTL_PFDE	0x0002	/* Power Fault Detected Enable */