linux-kernel - Re: [PATCH V4 1/2] PCI: dwc: Add API support to de-initialize host

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Message-ID: <20190618142821.GC9002@e121166-lin.cambridge.arm.com>
Date:   Tue, 18 Jun 2019 15:28:21 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Vidya Sagar <vidyas@...dia.com>
Cc:     jingoohan1@...il.com, gustavo.pimentel@...opsys.com,
        bhelgaas@...gle.com, Jisheng.Zhang@...aptics.com,
        thierry.reding@...il.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, kthota@...dia.com,
        mmaddireddy@...dia.com, sagar.tv@...il.com, kishon@...com
Subject: Re: [PATCH V4 1/2] PCI: dwc: Add API support to de-initialize host

On Tue, Jun 18, 2019 at 04:21:17PM +0530, Vidya Sagar wrote:

[...]

> > 2) It is not related to this patch but I fail to see the reasoning
> >     behind the __ in __dw_pci_read_dbi(), there is no no-underscore
> >     equivalent so its definition is somewhat questionable, maybe
> >     we should clean-it up (for dbi2 alike).
> Separate no-underscore versions are present in pcie-designware.h for
> each width (i.e. l/w/b) as inline and are calling __ versions passing
> size as argument.

I understand - the __ prologue was added in b50b2db266d8 maybe
Kishon can help us understand the __ rationale.

I am happy to merge it as is, I was just curious about the
__ annotation (not related to this patch).

Lorenzo

> > Lorenzo
> > 
> > > Thanks,
> > > Vidya Sagar
> > > 
> > > > 
> > > > > 
> > > > > > > 
> > > > > > > > 
> > > > > > > > > 
> > > > > > > > > Thanks,
> > > > > > > > > Lorenzo
> > > > > > > > > 
> > > > > > > > > > diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> > > > > > > > > > index 77db32529319..d069e4290180 100644
> > > > > > > > > > --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> > > > > > > > > > +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> > > > > > > > > > @@ -496,6 +496,14 @@ int dw_pcie_host_init(struct pcie_port *pp)
> > > > > > > > > >        return ret;
> > > > > > > > > >    }
> > > > > > > > > > +void dw_pcie_host_deinit(struct pcie_port *pp)
> > > > > > > > > > +{
> > > > > > > > > > +    pci_stop_root_bus(pp->root_bus);
> > > > > > > > > > +    pci_remove_root_bus(pp->root_bus);
> > > > > > > > > > +    if (pci_msi_enabled() && !pp->ops->msi_host_init)
> > > > > > > > > > +        dw_pcie_free_msi(pp);
> > > > > > > > > > +}
> > > > > > > > > > +
> > > > > > > > > >    static int dw_pcie_access_other_conf(struct pcie_port *pp, struct pci_bus *bus,
> > > > > > > > > >                         u32 devfn, int where, int size, u32 *val,
> > > > > > > > > >                         bool write)
> > > > > > > > > > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> > > > > > > > > > index deab426affd3..4f48ec78c7b9 100644
> > > > > > > > > > --- a/drivers/pci/controller/dwc/pcie-designware.h
> > > > > > > > > > +++ b/drivers/pci/controller/dwc/pcie-designware.h
> > > > > > > > > > @@ -348,6 +348,7 @@ void dw_pcie_msi_init(struct pcie_port *pp);
> > > > > > > > > >    void dw_pcie_free_msi(struct pcie_port *pp);
> > > > > > > > > >    void dw_pcie_setup_rc(struct pcie_port *pp);
> > > > > > > > > >    int dw_pcie_host_init(struct pcie_port *pp);
> > > > > > > > > > +void dw_pcie_host_deinit(struct pcie_port *pp);
> > > > > > > > > >    int dw_pcie_allocate_domains(struct pcie_port *pp);
> > > > > > > > > >    #else
> > > > > > > > > >    static inline irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
> > > > > > > > > > @@ -372,6 +373,10 @@ static inline int dw_pcie_host_init(struct pcie_port *pp)
> > > > > > > > > >        return 0;
> > > > > > > > > >    }
> > > > > > > > > > +static inline void dw_pcie_host_deinit(struct pcie_port *pp)
> > > > > > > > > > +{
> > > > > > > > > > +}
> > > > > > > > > > +
> > > > > > > > > >    static inline int dw_pcie_allocate_domains(struct pcie_port *pp)
> > > > > > > > > >    {
> > > > > > > > > >        return 0;
> > > > > > > > > > -- 
> > > > > > > > > > 2.17.1
> > > > > > > > > > 
> > > > > > > > 
> > > > > > > 
> > > > > > 
> > > > > 
> > > > 
> > > 
>