From: Vikas Gupta <vikas.gupta@broadcom.com>
To: Auger Eric <eric.auger@redhat.com>
Cc: Alex Williamson <alex.williamson@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Vikram Prakash <vikram.prakash@broadcom.com>,
Srinath Mannam <srinath.mannam@broadcom.com>
Subject: Re: [RFC, v1 0/3] msi support for platform devices
Date: Fri, 13 Nov 2020 22:54:47 +0530 [thread overview]
Message-ID: <CAHLZf_uAp-CzA-rkvFF70wT5zoB98OvErXxFthoBHyvzwTRxAQ@mail.gmail.com> (raw)
In-Reply-To: <96436cba-88e3-ddb6-36d6-000929b86979@redhat.com>
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Hi Eric,
On Fri, Nov 13, 2020 at 12:10 AM Auger Eric <eric.auger@redhat.com> wrote:
>
> Hi Vikas,
>
> On 11/12/20 6:58 PM, Vikas Gupta wrote:
> > This RFC adds support for MSI for platform devices.
> > a) MSI(s) is/are added in addition to the normal interrupts.
> > b) The vendor specific MSI configuration can be done using
> > callbacks which is implemented as msi module.
> > c) Adds a msi handling module for the Broadcom platform devices.
> >
> > Changes from:
> > -------------
> > v0 to v1:
> > i) Removed MSI device flag VFIO_DEVICE_FLAGS_MSI.
> > ii) Add MSI(s) at the end of the irq list of platform IRQs.
> > MSI(s) with first entry of MSI block has count and flag
> > information.
> > IRQ list: Allocation for IRQs + MSIs are allocated as below
> > Example: if there are 'n' IRQs and 'k' MSIs
> > -------------------------------------------------------
> > |IRQ-0|IRQ-1|....|IRQ-n|MSI-0|MSI-1|MSI-2|......|MSI-k|
> > -------------------------------------------------------
> I have not taken time yet to look at your series, but to me you should have
> |IRQ-0|IRQ-1|....|IRQ-n|MSI|MSIX
> then for setting a given MSIX (i) you would select the MSIx index and
> then set start=i count=1.
As per your suggestion, we should have, if there are n-IRQs, k-MSIXs
and m-MSIs, allocation of IRQs should be done as below
|IRQ0|IRQ1|......|IRQ-(n-1)|MSI|MSIX|
| |
|
|MSIX0||MSIX1||MSXI2|....|MSIX-(k-1)|
|MSI0||MSI1||MSI2|....|MSI-(m-1)|
With this implementation user space can know that, at indexes n and
n+1, edge triggered interrupts are present.
We may add an element in vfio_platform_irq itself to allocate MSIs/MSIXs
struct vfio_platform_irq{
.....
.....
struct vfio_platform_irq *block; => this points to the block
allocation for MSIs/MSIXs and all msi/msix are type of IRQs.
};
OR
Another structure can be defined in 'vfio_pci_private.h'
struct vfio_msi_ctx {
struct eventfd_ctx *trigger;
char *name;
};
and
struct vfio_platform_irq {
.....
.....
struct vfio_msi_ctx *block; => this points to the block allocation
for MSIs/MSIXs
};
Which of the above two options sounds OK to you? Please suggest.
> to me individual MSIs are encoded in the subindex and not in the index.
> The index just selects the "type" of interrupt.
>
> For PCI you just have:
> VFIO_PCI_INTX_IRQ_INDEX,
> VFIO_PCI_MSI_IRQ_INDEX, -> MSI index and then you play with
> start/count
> VFIO_PCI_MSIX_IRQ_INDEX,
> VFIO_PCI_ERR_IRQ_INDEX,
> VFIO_PCI_REQ_IRQ_INDEX,
>
> (include/uapi/linux/vfio.h)
In pci case, type of interrupts is fixed so they can be 'indexed' by
these enums but for VFIO platform user space will need to iterate all
(num_irqs) indexes to know at which indexes edge triggered interrupts
are present.
Thanks,
Vikas
>
> Thanks
>
> Eric
> > MSI-0 will have count=k set and flags set accordingly.
> >
> > Vikas Gupta (3):
> > vfio/platform: add support for msi
> > vfio/platform: change cleanup order
> > vfio/platform: add Broadcom msi module
> >
> > drivers/vfio/platform/Kconfig | 1 +
> > drivers/vfio/platform/Makefile | 1 +
> > drivers/vfio/platform/msi/Kconfig | 9 +
> > drivers/vfio/platform/msi/Makefile | 2 +
> > .../vfio/platform/msi/vfio_platform_bcmplt.c | 74 ++++++
> > drivers/vfio/platform/vfio_platform_common.c | 86 ++++++-
> > drivers/vfio/platform/vfio_platform_irq.c | 238 +++++++++++++++++-
> > drivers/vfio/platform/vfio_platform_private.h | 23 ++
> > 8 files changed, 419 insertions(+), 15 deletions(-)
> > create mode 100644 drivers/vfio/platform/msi/Kconfig
> > create mode 100644 drivers/vfio/platform/msi/Makefile
> > create mode 100644 drivers/vfio/platform/msi/vfio_platform_bcmplt.c
> >
>
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next prev parent reply other threads:[~2020-11-13 17:25 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-05 6:02 [RFC, v0 0/3] msi support for platform devices Vikas Gupta
2020-11-05 6:02 ` [RFC, v0 1/3] vfio/platform: add support for msi Vikas Gupta
2020-11-05 7:08 ` Alex Williamson
2020-11-06 2:54 ` Vikas Gupta
2020-11-06 3:12 ` Alex Williamson
2020-11-09 6:41 ` Vikas Gupta
2020-11-09 15:18 ` Auger Eric
2020-11-09 15:28 ` Alex Williamson
2020-11-10 11:06 ` Vikas Gupta
2020-11-09 15:05 ` Auger Eric
2020-11-10 11:01 ` Vikas Gupta
2020-11-05 6:02 ` [RFC, v0 2/3] vfio/platform: change cleanup order Vikas Gupta
2020-11-05 6:02 ` [RFC, v0 3/3] vfio/platform: add Broadcom msi module Vikas Gupta
2020-11-12 17:58 ` [RFC, v1 0/3] msi support for platform devices Vikas Gupta
2020-11-12 17:58 ` [RFC v1 1/3] vfio/platform: add support for msi Vikas Gupta
2020-11-12 17:58 ` [RFC v1 2/3] vfio/platform: change cleanup order Vikas Gupta
2020-11-12 17:58 ` [RFC v1 3/3] vfio/platform: add Broadcom msi module Vikas Gupta
2020-11-12 18:40 ` [RFC, v1 0/3] msi support for platform devices Auger Eric
2020-11-13 17:24 ` Vikas Gupta [this message]
2020-11-16 13:14 ` Auger Eric
2020-11-17 6:25 ` Vikas Gupta
2020-11-17 8:05 ` Auger Eric
2020-11-17 8:25 ` Auger Eric
2020-11-17 16:36 ` Vikas Gupta
2020-11-18 11:00 ` Auger Eric
2020-11-24 16:16 ` [RFC, v2 0/1] " Vikas Gupta
2020-11-24 16:16 ` [RFC v2 1/1] vfio/platform: add support for msi Vikas Gupta
2020-12-02 14:44 ` Auger Eric
2020-12-03 14:50 ` Vikas Gupta
2020-12-07 20:43 ` Auger Eric
2020-12-10 7:34 ` Vikas Gupta
2020-12-11 8:40 ` Auger Eric
2020-12-02 14:43 ` [RFC, v2 0/1] msi support for platform devices Auger Eric
2020-12-03 14:39 ` Vikas Gupta
2020-12-14 17:45 ` [RFC, v3 0/2] " Vikas Gupta
2020-12-14 17:45 ` [RFC v3 1/2] vfio/platform: add support for msi Vikas Gupta
2020-12-22 17:27 ` Auger Eric
2021-01-05 5:53 ` Vikas Gupta
2021-01-12 9:00 ` Auger Eric
2021-01-15 6:26 ` Vikas Gupta
2021-01-15 9:25 ` Auger Eric
2020-12-14 17:45 ` [RFC v3 2/2] vfio/platform: msi: add Broadcom platform devices Vikas Gupta
2021-01-12 9:22 ` Auger Eric
2021-01-15 6:35 ` Vikas Gupta
2021-01-15 9:24 ` Auger Eric
2021-01-19 22:45 ` Alex Williamson
2021-01-20 10:22 ` Auger Eric
2021-01-29 17:24 ` [RFC v4 0/3] msi support for " Vikas Gupta
2021-01-29 17:24 ` [RFC v4 1/3] vfio/platform: add support for msi Vikas Gupta
2021-02-08 13:30 ` Auger Eric
2021-01-29 17:24 ` [RFC v4 2/3] vfio/platform: change cleanup order Vikas Gupta
2021-02-08 13:31 ` Auger Eric
2021-01-29 17:24 ` [RFC v4 3/3] vfio: platform: reset: add msi support Vikas Gupta
2021-02-08 15:27 ` Auger Eric
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