linux-kernel - RE: [PATCH v3 1/2] PCI: xilinx-nwl: Enable coherent PCIe DMA traffic using CCI

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Date:   Fri, 2 Apr 2021 05:31:14 +0000
From:   Bharat Kumar Gogada <bharatku@...inx.com>
To:     Bharat Kumar Gogada <bharatku@...inx.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>
Subject: RE: [PATCH v3 1/2] PCI: xilinx-nwl: Enable coherent PCIe DMA traffic
 using CCI

Hi Lorenzo,

Any inputs on this ?

Regards,
Bharat

> -----Original Message-----
> From: Bharat Kumar Gogada
> Sent: Tuesday, March 23, 2021 4:48 PM
> To: Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>; linux-
> pci@...r.kernel.org; linux-kernel@...r.kernel.org
> Cc: bhelgaas@...gle.com; Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Subject: RE: [PATCH v3 1/2] PCI: xilinx-nwl: Enable coherent PCIe DMA traffic
> using CCI
> 
> Ping.
> 
> > -----Original Message-----
> > From: Bharat Kumar Gogada
> > Sent: Monday, March 15, 2021 11:43 AM
> > To: Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>; linux-
> > pci@...r.kernel.org; linux-kernel@...r.kernel.org
> > Cc: bhelgaas@...gle.com
> > Subject: RE: [PATCH v3 1/2] PCI: xilinx-nwl: Enable coherent PCIe DMA
> > traffic using CCI
> >
> > Ping.
> >
> > > -----Original Message-----
> > > From: Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
> > > Sent: Monday, February 22, 2021 2:18 PM
> > > To: linux-pci@...r.kernel.org; linux-kernel@...r.kernel.org
> > > Cc: bhelgaas@...gle.com; Bharat Kumar Gogada <bharatku@...inx.com>
> > > Subject: [PATCH v3 1/2] PCI: xilinx-nwl: Enable coherent PCIe DMA
> > > traffic using CCI
> > >
> > > Add support for routing PCIe DMA traffic coherently when Cache
> > > Coherent Interconnect (CCI) is enabled in the system.
> > > The "dma-coherent" property is used to determine if CCI is enabled or
> not.
> > > Refer to https://developer.arm.com/documentation/ddi0470/k/preface
> > > for the CCI specification.
> > >
> > > Signed-off-by: Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
> > > ---
> > >  drivers/pci/controller/pcie-xilinx-nwl.c | 7 +++++++
> > >  1 file changed, 7 insertions(+)
> > >
> > > diff --git a/drivers/pci/controller/pcie-xilinx-nwl.c
> > > b/drivers/pci/controller/pcie-xilinx-nwl.c
> > > index 07e36661bbc2..8689311c5ef6 100644
> > > --- a/drivers/pci/controller/pcie-xilinx-nwl.c
> > > +++ b/drivers/pci/controller/pcie-xilinx-nwl.c
> > > @@ -26,6 +26,7 @@
> > >
> > >  /* Bridge core config registers */
> > >  #define BRCFG_PCIE_RX0			0x00000000
> > > +#define BRCFG_PCIE_RX1			0x00000004
> > >  #define BRCFG_INTERRUPT			0x00000010
> > >  #define BRCFG_PCIE_RX_MSG_FILTER	0x00000020
> > >
> > > @@ -128,6 +129,7 @@
> > >  #define NWL_ECAM_VALUE_DEFAULT		12
> > >
> > >  #define CFG_DMA_REG_BAR			GENMASK(2, 0)
> > > +#define CFG_PCIE_CACHE			GENMASK(7, 0)
> > >
> > >  #define INT_PCI_MSI_NR			(2 * 32)
> > >
> > > @@ -675,6 +677,11 @@ static int nwl_pcie_bridge_init(struct nwl_pcie
> > > *pcie)
> > >  	nwl_bridge_writel(pcie, CFG_ENABLE_MSG_FILTER_MASK,
> > >  			  BRCFG_PCIE_RX_MSG_FILTER);
> > >
> > > +	/* This routes the PCIe DMA traffic to go through CCI path */
> > > +	if (of_dma_is_coherent(dev->of_node))
> > > +		nwl_bridge_writel(pcie, nwl_bridge_readl(pcie,
> > > BRCFG_PCIE_RX1) |
> > > +				  CFG_PCIE_CACHE, BRCFG_PCIE_RX1);
> > > +
> > >  	err = nwl_wait_for_link(pcie);
> > >  	if (err)
> > >  		return err;
> > > --
> > > 2.17.1