From: Jason Gunthorpe <jgg@nvidia.com>
To: "Gupta, Nipun" <Nipun.Gupta@amd.com>
Cc: Robin Murphy <robin.murphy@arm.com>,
Saravana Kannan <saravanak@google.com>,
Greg KH <gregkh@linuxfoundation.org>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"krzysztof.kozlowski+dt@linaro.org"
<krzysztof.kozlowski+dt@linaro.org>,
"rafael@kernel.org" <rafael@kernel.org>,
"eric.auger@redhat.com" <eric.auger@redhat.com>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"cohuck@redhat.com" <cohuck@redhat.com>,
"Gupta, Puneet (DCG-ENG)" <puneet.gupta@amd.com>,
"song.bao.hua@hisilicon.com" <song.bao.hua@hisilicon.com>,
"mchehab+huawei@kernel.org" <mchehab+huawei@kernel.org>,
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"Michael.Srba@seznam.cz" <Michael.Srba@seznam.cz>,
"mani@kernel.org" <mani@kernel.org>,
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"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"okaya@kernel.org" <okaya@kernel.org>,
"Anand, Harpreet" <harpreet.anand@amd.com>,
"Agarwal, Nikhil" <nikhil.agarwal@amd.com>,
"Simek, Michal" <michal.simek@amd.com>,
"git (AMD-Xilinx)" <git@amd.com>
Subject: Re: [RFC PATCH v2 2/6] bus/cdx: add the cdx bus driver
Date: Tue, 30 Aug 2022 10:01:29 -0300 [thread overview]
Message-ID: <Yw4KKWIGsR8MKa1j@nvidia.com> (raw)
In-Reply-To: <MN2PR12MB30870CE2759A9ABE652FAFD8E8799@MN2PR12MB3087.namprd12.prod.outlook.com>
On Tue, Aug 30, 2022 at 07:06:12AM +0000, Gupta, Nipun wrote:
> [AMD Official Use Only - General]
>
>
>
> > -----Original Message-----
> > From: Jason Gunthorpe <jgg@nvidia.com>
> > Sent: Monday, August 29, 2022 9:02 PM
> > To: Gupta, Nipun <Nipun.Gupta@amd.com>
> > Cc: Robin Murphy <robin.murphy@arm.com>; Saravana Kannan
> > <saravanak@google.com>; Greg KH <gregkh@linuxfoundation.org>;
> > robh+dt@kernel.org; krzysztof.kozlowski+dt@linaro.org; rafael@kernel.org;
> > eric.auger@redhat.com; alex.williamson@redhat.com; cohuck@redhat.com;
> > Gupta, Puneet (DCG-ENG) <puneet.gupta@amd.com>;
> > song.bao.hua@hisilicon.com; mchehab+huawei@kernel.org;
> > maz@kernel.org; f.fainelli@gmail.com; jeffrey.l.hugo@gmail.com;
> > Michael.Srba@seznam.cz; mani@kernel.org; yishaih@nvidia.com; linux-
> > kernel@vger.kernel.org; devicetree@vger.kernel.org; kvm@vger.kernel.org;
> > okaya@kernel.org; Anand, Harpreet <harpreet.anand@amd.com>; Agarwal,
> > Nikhil <nikhil.agarwal@amd.com>; Simek, Michal <michal.simek@amd.com>;
> > git (AMD-Xilinx) <git@amd.com>
> > Subject: Re: [RFC PATCH v2 2/6] bus/cdx: add the cdx bus driver
> >
> > [CAUTION: External Email]
> >
> > On Mon, Aug 29, 2022 at 04:49:02AM +0000, Gupta, Nipun wrote:
> >
> > > Devices are created in FPFGA with a CDX wrapper, and CDX
> > controller(firmware)
> > > reads that CDX wrapper to find out new devices. Host driver then interacts
> > with
> > > firmware to find newly discovered devices. This bus aligns with PCI
> > infrastructure.
> > > It happens to be an embedded interface as opposed to off-chip
> > connection.
> >
> > Why do you need an FW in all of this?
> >
> > And why do you need DT at all?
>
> We need DT to describe the CDX controller only, similar to
> how PCI controller is described in DT. PCI devices are
> never enumerated in DT. All children are to be dynamically
> discovered.
>
> Children devices do not require DT as they will be discovered
> by the bus driver.
>
> Like PCI controller talks to PCI device over PCI spec defined channel,
> we need CDX controller to talk to CDX device over a custom
> defined (FW managed) channel.
It would be alot clearer to see a rfc cdx driver that doesn't have all
the dt,fwnode,of stuff in it and works like PCI does, with a custom
matcher and custom properies instead of trying to co-opt the DT things:
Eg stuff like this make it look like you are building DT nodes:
+ struct property_entry port_props[] = {
+ PROPERTY_ENTRY_STRING("compatible",
+ dev_types[dev_params->dev_type_idx].compat),
+ { }
+ ret = of_map_id(np, req_id, "iommu-map", "iommu-map-mask",
+ NULL, &dev_params.stream_id);
I still don't understand why FW would be involved, we usually don't
involve FW for PCI..
Jason
next prev parent reply other threads:[~2022-08-30 13:01 UTC|newest]
Thread overview: 113+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-03 12:26 [RFC PATCH 0/2] add support for CDX bus MSI domain Nipun Gupta
2022-08-03 12:26 ` [RFC PATCH 1/2] irqchip: cdx-bus: add cdx-MSI domain with gic-its domain as parent Nipun Gupta
2022-08-03 12:33 ` Greg KH
2022-08-03 12:37 ` Gupta, Nipun
2022-08-04 8:49 ` Marc Zyngier
2022-08-04 9:18 ` Gupta, Nipun
[not found] ` <87mtckwaxa.wl-maz@kernel.org>
2022-08-04 12:11 ` Gupta, Nipun
2022-08-03 12:26 ` [RFC PATCH 2/2] driver core: add compatible string in sysfs for platform devices Nipun Gupta
2022-08-03 12:31 ` Greg KH
2022-08-03 12:46 ` Gupta, Nipun
2022-08-03 14:16 ` [RFC PATCH 0/2] add support for CDX bus MSI domain Robin Murphy
2022-08-04 4:23 ` Gupta, Nipun
2022-08-17 16:00 ` Jason Gunthorpe
2022-08-17 15:05 ` [RFC PATCH v2 0/6] add support for CDX bus controller Nipun Gupta
2022-08-17 15:05 ` [RFC PATCH v2 1/6] Documentation: DT: Add entry for CDX controller Nipun Gupta
2022-08-18 9:54 ` Krzysztof Kozlowski
2022-08-18 9:59 ` Krzysztof Kozlowski
2022-09-05 14:05 ` Gupta, Nipun
2022-09-06 6:55 ` Krzysztof Kozlowski
2022-09-06 7:03 ` Gupta, Nipun
2022-09-06 7:20 ` Krzysztof Kozlowski
2022-08-17 15:05 ` [RFC PATCH v2 2/6] bus/cdx: add the cdx bus driver Nipun Gupta
2022-08-17 15:32 ` Greg KH
2022-08-17 15:46 ` Marc Zyngier
2022-08-22 13:21 ` Gupta, Nipun
2022-08-22 13:29 ` Greg KH
2022-08-24 8:50 ` Gupta, Nipun
2022-08-24 12:11 ` Greg KH
2022-08-24 23:31 ` Jason Gunthorpe
2022-08-25 18:38 ` Saravana Kannan
2022-08-25 19:57 ` Robin Murphy
2022-08-26 0:08 ` Jason Gunthorpe
2022-08-29 4:49 ` Gupta, Nipun
2022-08-29 4:49 ` Gupta, Nipun
2022-08-29 15:31 ` Jason Gunthorpe
2022-08-30 7:06 ` Gupta, Nipun
2022-08-30 11:25 ` Robin Murphy
2022-08-30 13:01 ` Jason Gunthorpe [this message]
2022-08-30 13:12 ` Gupta, Nipun
2022-08-17 15:05 ` [RFC PATCH v2 3/6] bus/cdx: add cdx-MSI domain with gic-its domain as parent Nipun Gupta
2022-08-17 15:33 ` Greg KH
2022-08-17 15:05 ` [RFC PATCH v2 4/6] bus/cdx: add rescan and reset support Nipun Gupta
2022-08-17 15:05 ` [RFC PATCH v2 5/6] vfio: platform: reset: add reset for cdx devices Nipun Gupta
2022-08-17 15:05 ` [RFC PATCH v2 6/6] driver core: add compatible string in sysfs for platform devices Nipun Gupta
2022-08-17 15:30 ` Greg KH
2022-08-17 16:04 ` Saravana Kannan
2022-09-05 13:54 ` Gupta, Nipun
2022-09-06 13:47 ` [RFC PATCH v3 0/7] add support for CDX bus Nipun Gupta
2022-09-06 13:47 ` [RFC PATCH v3 1/7] dt-bindings: bus: add CDX bus device tree bindings Nipun Gupta
2022-09-06 17:46 ` Rob Herring
2022-09-07 3:13 ` Gupta, Nipun
2022-09-08 10:51 ` Krzysztof Kozlowski
2022-09-06 13:47 ` [RFC PATCH v3 2/7] bus/cdx: add the cdx bus driver Nipun Gupta
2022-09-07 0:32 ` Saravana Kannan
2022-09-07 3:21 ` Gupta, Nipun
2022-09-07 18:06 ` Saravana Kannan
2022-09-07 12:32 ` Greg KH
2022-09-08 13:29 ` Gupta, Nipun
2022-09-06 13:47 ` [RFC PATCH v3 3/7] iommu/arm-smmu-v3: support ops registration for CDX bus Nipun Gupta
2022-09-07 0:10 ` Saravana Kannan
2022-09-07 3:17 ` Gupta, Nipun
2022-09-07 8:27 ` Robin Murphy
2022-09-07 18:24 ` Saravana Kannan
2022-09-07 20:40 ` Robin Murphy
2022-09-08 0:14 ` Saravana Kannan
2022-09-06 13:47 ` [RFC PATCH v3 4/7] bus/cdx: add cdx-MSI domain with gic-its domain as parent Nipun Gupta
2022-09-06 17:19 ` Jason Gunthorpe
2022-09-07 11:17 ` Marc Zyngier
2022-09-07 11:33 ` Robin Murphy
2022-09-07 12:14 ` Marc Zyngier
2022-09-07 11:35 ` Radovanovic, Aleksandar
[not found] ` <87illzuzyw.wl-maz@kernel.org>
2022-09-07 13:18 ` Radovanovic, Aleksandar
[not found] ` <87edwmuw4f.wl-maz@kernel.org>
2022-09-08 9:51 ` Radovanovic, Aleksandar
2022-09-08 11:49 ` Robin Murphy
2022-09-07 13:18 ` Marc Zyngier
2022-09-08 14:13 ` Gupta, Nipun
[not found] ` <87a67aueg7.wl-maz@kernel.org>
2022-09-09 6:32 ` Gupta, Nipun
2022-10-12 10:04 ` Gupta, Nipun
2022-10-12 10:34 ` Radovanovic, Aleksandar
2022-10-12 13:02 ` Jason Gunthorpe
2022-10-12 13:37 ` Radovanovic, Aleksandar
2022-10-12 14:38 ` Jason Gunthorpe
2022-10-12 15:09 ` Radovanovic, Aleksandar
2022-10-13 12:43 ` Jason Gunthorpe
2022-10-14 11:18 ` Radovanovic, Aleksandar
2022-10-14 11:54 ` gregkh
2022-10-14 12:13 ` Radovanovic, Aleksandar
2022-10-14 13:46 ` gregkh
2022-10-14 13:58 ` Jason Gunthorpe
2022-09-06 13:47 ` [RFC PATCH v3 5/7] bus/cdx: add bus and device attributes Nipun Gupta
2022-09-06 13:48 ` [RFC PATCH v3 6/7] vfio/cdx: add support for CDX bus Nipun Gupta
2022-09-06 17:20 ` Jason Gunthorpe
2022-09-06 17:23 ` Gupta, Nipun
2022-09-06 13:48 ` [RFC PATCH v3 7/7] vfio/cdx: add interrupt support Nipun Gupta
2022-10-14 4:40 ` [RFC PATCH v4 0/8] add support for CDX bus Nipun Gupta
2022-10-14 4:40 ` [RFC PATCH v4 1/8] dt-bindings: bus: add CDX bus device tree bindings Nipun Gupta
2022-10-14 14:17 ` Rob Herring
2022-10-17 10:18 ` Gupta, Nipun
2022-10-14 4:40 ` [RFC PATCH v4 2/8] bus/cdx: add the cdx bus driver Nipun Gupta
2022-10-14 7:15 ` Greg KH
2022-10-14 8:12 ` Gupta, Nipun
2022-10-14 7:18 ` Greg KH
2022-10-14 8:20 ` Gupta, Nipun
2022-10-14 4:40 ` [RFC PATCH v4 3/8] iommu/arm-smmu-v3: support ops registration for CDX bus Nipun Gupta
2022-10-14 4:51 ` Gupta, Nipun
2022-10-14 4:40 ` [RFC PATCH v4 4/8] bux/cdx: support dma configuration for CDX devices Nipun Gupta
2022-10-14 4:40 ` [RFC PATCH v4 5/8] bus/cdx: add bus and device attributes Nipun Gupta
2022-10-14 4:40 ` [RFC PATCH v4 6/8] irq/msi: use implicit msi domain for alloc and free Nipun Gupta
2022-10-14 4:40 ` [RFC PATCH v4 7/8] bus/cdx: add cdx-MSI domain with gic-its domain as parent Nipun Gupta
2022-11-17 19:10 ` Thomas Gleixner
2022-10-14 4:40 ` [RFC PATCH v4 8/8] bus/cdx: add cdx controller Nipun Gupta
2022-10-14 14:10 ` [RFC PATCH v4 0/8] add support for CDX bus Rob Herring
2022-10-17 10:08 ` Gupta, Nipun
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