linux-kernel - Re: [PATCH 3/6] PCI: dwc: Add outbound MSG TLPs support

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Date: Wed, 31 Jan 2024 23:18:18 -0500
From: Frank Li <Frank.li@....com>
To: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, Jingoo Han <jingoohan1@...il.com>,
	Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Serge Semin <fancer.lancer@...il.com>
Subject: Re: [PATCH 3/6] PCI: dwc: Add outbound MSG TLPs support

On Thu, Feb 01, 2024 at 03:07:24AM +0000, Yoshihiro Shimoda wrote:
> Hi Frank,
> 
> > From: Frank Li, Sent: Wednesday, January 31, 2024 9:45 AM
> > 
> > From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> > 
> > Add "code" and "routing" into struct dw_pcie_ob_atu_cfg for triggering
> > INTx IRQs by iATU in the PCIe endpoint mode in near the future.
> > PCIE_ATU_INHIBIT_PAYLOAD is set to issue TLP type of Msg instead of
> > MsgD. So, this implementation supports the data-less messages only
> > for now.
> > 
> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> > Reviewed-by: Serge Semin <fancer.lancer@...il.com>
> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> 
> Perhaps, your Signed-off-by is needed here?

Yes, I will add at next version.

Frank
> 
> Best regards,
> Yoshihiro Shimoda
> 
> > ---
> >  drivers/pci/controller/dwc/pcie-designware.c | 9 +++++++--
> >  drivers/pci/controller/dwc/pcie-designware.h | 4 ++++
> >  2 files changed, 11 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> > index df2575ec5f44c..ba909fade9db1 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware.c
> > @@ -499,7 +499,7 @@ int dw_pcie_prog_outbound_atu(struct dw_pcie *pci,
> >  	dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_UPPER_TARGET,
> >  			      upper_32_bits(atu->pci_addr));
> > 
> > -	val = atu->type | PCIE_ATU_FUNC_NUM(atu->func_no);
> > +	val = atu->type | atu->routing | PCIE_ATU_FUNC_NUM(atu->func_no);
> >  	if (upper_32_bits(limit_addr) > upper_32_bits(cpu_addr) &&
> >  	    dw_pcie_ver_is_ge(pci, 460A))
> >  		val |= PCIE_ATU_INCREASE_REGION_SIZE;
> > @@ -507,7 +507,12 @@ int dw_pcie_prog_outbound_atu(struct dw_pcie *pci,
> >  		val = dw_pcie_enable_ecrc(val);
> >  	dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_REGION_CTRL1, val);
> > 
> > -	dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_REGION_CTRL2, PCIE_ATU_ENABLE);
> > +	val = PCIE_ATU_ENABLE;
> > +	if (atu->type == PCIE_ATU_TYPE_MSG) {
> > +		/* The data-less messages only for now */
> > +		val |= PCIE_ATU_INHIBIT_PAYLOAD | atu->code;
> > +	}
> > +	dw_pcie_writel_atu_ob(pci, atu->index, PCIE_ATU_REGION_CTRL2, val);
> > 
> >  	/*
> >  	 * Make sure ATU enable takes effect before any subsequent config
> > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> > index d21db82e586d5..703b50bc5e0f1 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.h
> > +++ b/drivers/pci/controller/dwc/pcie-designware.h
> > @@ -148,11 +148,13 @@
> >  #define PCIE_ATU_TYPE_IO		0x2
> >  #define PCIE_ATU_TYPE_CFG0		0x4
> >  #define PCIE_ATU_TYPE_CFG1		0x5
> > +#define PCIE_ATU_TYPE_MSG		0x10
> >  #define PCIE_ATU_TD			BIT(8)
> >  #define PCIE_ATU_FUNC_NUM(pf)           ((pf) << 20)
> >  #define PCIE_ATU_REGION_CTRL2		0x004
> >  #define PCIE_ATU_ENABLE			BIT(31)
> >  #define PCIE_ATU_BAR_MODE_ENABLE	BIT(30)
> > +#define PCIE_ATU_INHIBIT_PAYLOAD	BIT(22)
> >  #define PCIE_ATU_FUNC_NUM_MATCH_EN      BIT(19)
> >  #define PCIE_ATU_LOWER_BASE		0x008
> >  #define PCIE_ATU_UPPER_BASE		0x00C
> > @@ -303,6 +305,8 @@ struct dw_pcie_ob_atu_cfg {
> >  	int index;
> >  	int type;
> >  	u8 func_no;
> > +	u8 code;
> > +	u8 routing;
> >  	u64 cpu_addr;
> >  	u64 pci_addr;
> >  	u64 size;
> > 
> > --
> > 2.34.1
>