Linux-PCI Archive on lore.kernel.org
 help / color / Atom feed
From: Xiaowei Bao <xiaowei.bao@nxp.com>
To: Kishon Vijay Abraham I <kishon@ti.com>,
	Andrew Murray <andrew.murray@arm.com>
Cc: "jingoohan1@gmail.com" <jingoohan1@gmail.com>,
	"gustavo.pimentel@synopsys.com" <gustavo.pimentel@synopsys.com>,
	"bhelgaas@google.com" <bhelgaas@google.com>,
	"robh+dt@kernel.org" <robh+dt@kernel.org>,
	"mark.rutland@arm.com" <mark.rutland@arm.com>,
	"shawnguo@kernel.org" <shawnguo@kernel.org>,
	Leo Li <leoyang.li@nxp.com>,
	"lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>,
	"arnd@arndb.de" <arnd@arndb.de>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	"M.h. Lian" <minghuan.lian@nxp.com>,
	Mingkai Hu <mingkai.hu@nxp.com>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
	"Z.q. Hou" <zhiqiang.hou@nxp.com>
Subject: RE: [PATCH 02/10] PCI: designware-ep: Add the doorbell mode of MSI-X in EP mode
Date: Fri, 16 Aug 2019 11:14:53 +0000
Message-ID: <AM5PR04MB3299ABCA78FB6B105F4BCDC7F5AF0@AM5PR04MB3299.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <02cf2f3d-336c-85bb-1fb5-a141c5a9cf79@ti.com>



> -----Original Message-----
> From: Kishon Vijay Abraham I <kishon@ti.com>
> Sent: 2019年8月16日 18:50
> To: Xiaowei Bao <xiaowei.bao@nxp.com>; Andrew Murray
> <andrew.murray@arm.com>
> Cc: jingoohan1@gmail.com; gustavo.pimentel@synopsys.com;
> bhelgaas@google.com; robh+dt@kernel.org; mark.rutland@arm.com;
> shawnguo@kernel.org; Leo Li <leoyang.li@nxp.com>;
> lorenzo.pieralisi@arm.com; arnd@arndb.de; gregkh@linuxfoundation.org;
> M.h. Lian <minghuan.lian@nxp.com>; Mingkai Hu <mingkai.hu@nxp.com>;
> linux-pci@vger.kernel.org; devicetree@vger.kernel.org;
> linux-kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
> linuxppc-dev@lists.ozlabs.org; Z.q. Hou <zhiqiang.hou@nxp.com>
> Subject: Re: [PATCH 02/10] PCI: designware-ep: Add the doorbell mode of
> MSI-X in EP mode
> 
> Hi,
> 
> On 16/08/19 8:28 AM, Xiaowei Bao wrote:
> >
> >
> >> -----Original Message-----
> >> From: Andrew Murray <andrew.murray@arm.com>
> >> Sent: 2019年8月15日 19:54
> >> To: Xiaowei Bao <xiaowei.bao@nxp.com>
> >> Cc: jingoohan1@gmail.com; gustavo.pimentel@synopsys.com;
> >> bhelgaas@google.com; robh+dt@kernel.org; mark.rutland@arm.com;
> >> shawnguo@kernel.org; Leo Li <leoyang.li@nxp.com>; kishon@ti.com;
> >> lorenzo.pieralisi@arm.com; arnd@arndb.de; gregkh@linuxfoundation.org;
> >> M.h. Lian <minghuan.lian@nxp.com>; Mingkai Hu
> <mingkai.hu@nxp.com>;
> >> Roy Zang <roy.zang@nxp.com>; linux-pci@vger.kernel.org;
> >> devicetree@vger.kernel.org; linux-kernel@vger.kernel.org;
> >> linux-arm-kernel@lists.infradead.org; linuxppc-dev@lists.ozlabs.org
> >> Subject: Re: [PATCH 02/10] PCI: designware-ep: Add the doorbell mode
> >> of MSI-X in EP mode
> >>
> >> On Thu, Aug 15, 2019 at 04:37:08PM +0800, Xiaowei Bao wrote:
> >>> Add the doorbell mode of MSI-X in EP mode.
> >>>
> >>> Signed-off-by: Xiaowei Bao <xiaowei.bao@nxp.com>
> >>> ---
> >>>  drivers/pci/controller/dwc/pcie-designware-ep.c | 14
> ++++++++++++++
> >>>  drivers/pci/controller/dwc/pcie-designware.h    | 14
> ++++++++++++++
> >>>  2 files changed, 28 insertions(+)
> >>>
> >>> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c
> >>> b/drivers/pci/controller/dwc/pcie-designware-ep.c
> >>> index 75e2955..e3a7cdf 100644
> >>> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> >>> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> >>> @@ -454,6 +454,20 @@ int dw_pcie_ep_raise_msi_irq(struct
> dw_pcie_ep
> >> *ep, u8 func_no,
> >>>  	return 0;
> >>>  }
> >>>
> >>> +int dw_pcie_ep_raise_msix_irq_doorbell(struct dw_pcie_ep *ep, u8
> >> func_no,
> >>> +				       u16 interrupt_num)
> >>> +{
> >>> +	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> >>> +	u32 msg_data;
> >>> +
> >>> +	msg_data = (func_no << PCIE_MSIX_DOORBELL_PF_SHIFT) |
> >>> +		   (interrupt_num - 1);
> >>> +
> >>> +	dw_pcie_writel_dbi(pci, PCIE_MSIX_DOORBELL, msg_data);
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>>  int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
> >>>  			      u16 interrupt_num)
> >>
> >> Have I understood correctly that the hardware provides an alternative
> >> mechanism that allows for raising MSI-X interrupts without the bother
> >> of reading the capabilities registers?
> > Yes, the hardware provide two way to MSI-X, please check the page 492
> > of
> > DWC_pcie_dm_registers_4.30 Menu.
> > MSIX_DOORBELL_OFF on page 492 0x948 Description: MSI-X Doorbell
> > Register....>
> >>
> >> If so is there any good reason to keep dw_pcie_ep_raise_msix_irq?
> >> (And thus use it in dw_plat_pcie_ep_raise_irq also)?
> > I am not sure, but I think the dw_pcie_ep_raise_msix_irq function is
> > not correct, because I think we can't get the MSIX table from the
> > address ep->phys_base + tbl_addr, but I also don't know where I can get the
> correct MSIX table.
> 
> Sometime back when I tried raising MSI-X from EP, it was failing. It's quite
> possible dw_pcie_ep_raise_msix_irq function is not correct.
> 
> MSI-X table can be obtained from the inbound ATU corresponding to the MSIX
> bar.
> IMO MSI-X support in EP mode needs rework. For instance set_msix should
> also take BAR number as input to be configured in the MSI-X capability. The
> function driver (pci-epf-test.c) should allocate memory taking into account the
> MSI-X table.
Hi Kishon,

Thanks a lot for your explain, yes, we can get the MSI-X table from the inbound ATU of
the MSIX BAR.
> 
> Thanks
> Kishon

  reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-15  8:37 [PATCH 01/10] PCI: designware-ep: Add multiple PFs support for DWC Xiaowei Bao
2019-08-15  8:37 ` [PATCH 02/10] PCI: designware-ep: Add the doorbell mode of MSI-X in EP mode Xiaowei Bao
2019-08-15 11:53   ` Andrew Murray
2019-08-16  2:58     ` Xiaowei Bao
2019-08-16 10:20       ` Andrew Murray
2019-08-16 11:01         ` Xiaowei Bao
2019-08-16 10:49       ` Kishon Vijay Abraham I
2019-08-16 11:14         ` Xiaowei Bao [this message]
2019-08-15  8:37 ` [PATCH 03/10] PCI: designware-ep: Move the function of getting MSI capability forward Xiaowei Bao
2019-08-15  8:37 ` [PATCH 04/10] dt-bindings: pci: layerscape-pci: add compatible strings for ls1088a and ls2088a Xiaowei Bao
2019-08-15  8:37 ` [PATCH 05/10] PCI: layerscape: Modify the way of getting capability with different PEX Xiaowei Bao
2019-08-15 12:51   ` Andrew Murray
2019-08-16  3:00     ` Xiaowei Bao
2019-08-16 10:25       ` Andrew Murray
2019-08-16 11:03         ` Xiaowei Bao
2019-08-15  8:37 ` [PATCH 06/10] PCI: layerscape: Modify the MSIX to the doorbell way Xiaowei Bao
2019-08-15  8:37 ` [PATCH 07/10] PCI: layerscape: Fix some format issue of the code Xiaowei Bao
2019-08-15  8:37 ` [PATCH 08/10] dt-bindings: PCI: Add the pf-offset property Xiaowei Bao
2019-08-27 16:26   ` Rob Herring
2019-08-15  8:37 ` [PATCH 09/10] arm64: dts: layerscape: Add PCIe EP node for ls1088a Xiaowei Bao
2019-08-15  8:37 ` [PATCH 10/10] misc: pci_endpoint_test: Add LS1088a in pci_device_id table Xiaowei Bao
2019-08-15 11:31 ` [PATCH 01/10] PCI: designware-ep: Add multiple PFs support for DWC Andrew Murray
2019-08-16  2:55   ` Xiaowei Bao
2019-08-16  9:44     ` Andrew Murray
2019-08-16 11:00       ` Xiaowei Bao
2019-08-16 12:35         ` Andrew Murray
2019-08-16 15:11           ` Xiaowei Bao

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=AM5PR04MB3299ABCA78FB6B105F4BCDC7F5AF0@AM5PR04MB3299.eurprd04.prod.outlook.com \
    --to=xiaowei.bao@nxp.com \
    --cc=andrew.murray@arm.com \
    --cc=arnd@arndb.de \
    --cc=bhelgaas@google.com \
    --cc=devicetree@vger.kernel.org \
    --cc=gregkh@linuxfoundation.org \
    --cc=gustavo.pimentel@synopsys.com \
    --cc=jingoohan1@gmail.com \
    --cc=kishon@ti.com \
    --cc=leoyang.li@nxp.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=lorenzo.pieralisi@arm.com \
    --cc=mark.rutland@arm.com \
    --cc=minghuan.lian@nxp.com \
    --cc=mingkai.hu@nxp.com \
    --cc=robh+dt@kernel.org \
    --cc=shawnguo@kernel.org \
    --cc=zhiqiang.hou@nxp.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-PCI Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-pci/0 linux-pci/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-pci linux-pci/ https://lore.kernel.org/linux-pci \
		linux-pci@vger.kernel.org
	public-inbox-index linux-pci

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-pci


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git