RE: [PATCH v16 03/22] PCI: Add INTx Mechanism Messages macros

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Hello Serge,

> From: Serge Semin, Sent: Monday, June 5, 2023 8:08 AM
> 
> On Wed, May 10, 2023 at 03:22:15PM +0900, Yoshihiro Shimoda wrote:
> > Add "Message Routing" and "INTx Mechanism Messages" macros to send
> > a message by a PCIe driver.
> >
> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> > ---
> >  drivers/pci/pci.h | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >
> > diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> > index 2475098f6518..67badc40e90b 100644
> > --- a/drivers/pci/pci.h
> > +++ b/drivers/pci/pci.h
> > @@ -11,6 +11,24 @@
> >
> >  #define PCI_VSEC_ID_INTEL_TBT	0x1234	/* Thunderbolt */
> >
> 
> > +/* Message Routing */
> 
> Call it "Implicit Message Routing (r[2:0])" as per the specification.

I got it.

> > +#define PCI_MSG_ROUTING_RC	0
> > +#define PCI_MSG_ROUTING_ADDR	1
> > +#define PCI_MSG_ROUTING_ID	2
> > +#define PCI_MSG_ROUTING_BC	3
> > +#define PCI_MSG_ROUTING_LOCAL	4
> > +#define PCI_MSG_ROUTING_GATHER	5
> 
> IMO prefix like this PCI_MSG_TYPE_R_{RC,ADDR,ID,BC,...} would be a bit
> better since it would indicate that this routing flags are a sub-field of
> the Message Type field. Bjorn?

I got it. I'll rename them.

> > +
> > +/* INTx Mechanism Messages */
> > +#define PCI_CODE_ASSERT_INTA	0x20
> > +#define PCI_CODE_ASSERT_INTB	0x21
> > +#define PCI_CODE_ASSERT_INTC	0x22
> > +#define PCI_CODE_ASSERT_INTD	0x23
> > +#define PCI_CODE_DEASSERT_INTA	0x24
> > +#define PCI_CODE_DEASSERT_INTB	0x25
> > +#define PCI_CODE_DEASSERT_INTC	0x26
> > +#define PCI_CODE_DEASSERT_INTD	0x27
> 
> IMO Prefix PCI_MSG_CODE_... would be a bit more descriptive since per
> the specification the respective message field is called "Message
> Code" and not just "Code". Bjorn?

I got it. I'll rename them.

Best regards,
Yoshihiro Shimoda

> -Serge(y)
> 
> > +
> >  extern const unsigned char pcie_link_speed[];
> >  extern bool pci_early_dump;
> >
> > --
> > 2.25.1
> >




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