From: Jason Gunthorpe <jgg@mellanox.com>
To: Dave Jiang <dave.jiang@intel.com>
Cc: vkoul@kernel.org, megha.dey@intel.com, maz@kernel.org,
bhelgaas@google.com, rafael@kernel.org,
gregkh@linuxfoundation.org, tglx@linutronix.de, hpa@zytor.com,
alex.williamson@redhat.com, jacob.jun.pan@intel.com,
ashok.raj@intel.com, yi.l.liu@intel.com, baolu.lu@intel.com,
kevin.tian@intel.com, sanjay.k.kumar@intel.com,
tony.luck@intel.com, jing.lin@intel.com,
dan.j.williams@intel.com, kwankhede@nvidia.com,
eric.auger@redhat.com, parav@mellanox.com, dave.hansen@intel.com,
netanelg@mellanox.com, shahafs@mellanox.com,
yan.y.zhao@linux.intel.com, pbonzini@redhat.com,
samuel.ortiz@intel.com, mona.hossain@intel.com,
dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org,
x86@kernel.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH RFC v2 02/18] irq/dev-msi: Add support for a new DEV_MSI irq domain
Date: Tue, 21 Jul 2020 13:13:44 -0300 [thread overview]
Message-ID: <20200721161344.GA2021248@mellanox.com> (raw)
In-Reply-To: <159534734833.28840.10067945890695808535.stgit@djiang5-desk3.ch.intel.com>
On Tue, Jul 21, 2020 at 09:02:28AM -0700, Dave Jiang wrote:
> From: Megha Dey <megha.dey@intel.com>
>
> Add support for the creation of a new DEV_MSI irq domain. It creates a
> new irq chip associated with the DEV_MSI domain and adds the necessary
> domain operations to it.
>
> Add a new config option DEV_MSI which must be enabled by any
> driver that wants to support device-specific message-signaled-interrupts
> outside of PCI-MSI(-X).
>
> Lastly, add device specific mask/unmask callbacks in addition to a write
> function to the platform_msi_ops.
>
> Reviewed-by: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: Megha Dey <megha.dey@intel.com>
> Signed-off-by: Dave Jiang <dave.jiang@intel.com>
> arch/x86/include/asm/hw_irq.h | 5 ++
> drivers/base/Kconfig | 7 +++
> drivers/base/Makefile | 1
> drivers/base/dev-msi.c | 95 +++++++++++++++++++++++++++++++++++++++++
> drivers/base/platform-msi.c | 45 +++++++++++++------
> drivers/base/platform-msi.h | 23 ++++++++++
> include/linux/msi.h | 8 +++
> 7 files changed, 168 insertions(+), 16 deletions(-)
> create mode 100644 drivers/base/dev-msi.c
> create mode 100644 drivers/base/platform-msi.h
>
> diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
> index 74c12437401e..8ecd7570589d 100644
> +++ b/arch/x86/include/asm/hw_irq.h
> @@ -61,6 +61,11 @@ struct irq_alloc_info {
> irq_hw_number_t msi_hwirq;
> };
> #endif
> +#ifdef CONFIG_DEV_MSI
> + struct {
> + irq_hw_number_t hwirq;
> + };
> +#endif
Why is this in this patch? I didn't see an obvious place where it is
used?
>
> +static void __platform_msi_desc_mask_unmask_irq(struct msi_desc *desc, u32 mask)
> +{
> + const struct platform_msi_ops *ops;
> +
> + ops = desc->platform.msi_priv_data->ops;
> + if (!ops)
> + return;
> +
> + if (mask) {
> + if (ops->irq_mask)
> + ops->irq_mask(desc);
> + } else {
> + if (ops->irq_unmask)
> + ops->irq_unmask(desc);
> + }
> +}
> +
> +void platform_msi_mask_irq(struct irq_data *data)
> +{
> + __platform_msi_desc_mask_unmask_irq(irq_data_get_msi_desc(data), 1);
> +}
> +
> +void platform_msi_unmask_irq(struct irq_data *data)
> +{
> + __platform_msi_desc_mask_unmask_irq(irq_data_get_msi_desc(data), 0);
> +}
This is a bit convoluted, just call the op directly:
void platform_msi_unmask_irq(struct irq_data *data)
{
const struct platform_msi_ops *ops = desc->platform.msi_priv_data->ops;
if (ops->irq_unmask)
ops->irq_unmask(desc);
}
> diff --git a/include/linux/msi.h b/include/linux/msi.h
> index 7f6a8eb51aca..1da97f905720 100644
> +++ b/include/linux/msi.h
> @@ -323,9 +323,13 @@ enum {
>
> /*
> * platform_msi_ops - Callbacks for platform MSI ops
> + * @irq_mask: mask an interrupt source
> + * @irq_unmask: unmask an interrupt source
> * @write_msg: write message content
> */
> struct platform_msi_ops {
> + unsigned int (*irq_mask)(struct msi_desc *desc);
> + unsigned int (*irq_unmask)(struct msi_desc *desc);
Why do these functions return things if the only call site throws it
away?
Jason
next prev parent reply other threads:[~2020-07-21 16:13 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-21 16:02 [PATCH RFC v2 00/18] Add VFIO mediated device support and DEV-MSI support for the idxd driver Dave Jiang
2020-07-21 16:02 ` [PATCH RFC v2 01/18] platform-msi: Introduce platform_msi_ops Dave Jiang
2020-07-21 16:02 ` [PATCH RFC v2 02/18] irq/dev-msi: Add support for a new DEV_MSI irq domain Dave Jiang
2020-07-21 16:13 ` Jason Gunthorpe [this message]
2020-07-22 16:50 ` Dey, Megha
2020-07-22 18:52 ` Marc Zyngier
2020-07-22 19:59 ` Jason Gunthorpe
2020-07-23 8:51 ` Marc Zyngier
2020-07-24 0:16 ` Jason Gunthorpe
2020-07-24 0:36 ` Thomas Gleixner
2020-08-05 19:18 ` Dey, Megha
2020-08-05 22:15 ` Jason Gunthorpe
2020-08-05 22:36 ` Dey, Megha
2020-08-05 22:53 ` Jason Gunthorpe
2020-08-06 0:13 ` Dey, Megha
2020-08-06 0:19 ` Jason Gunthorpe
2020-08-06 0:32 ` Dey, Megha
2020-08-06 0:46 ` Jason Gunthorpe
2020-08-06 17:10 ` Thomas Gleixner
2020-08-06 17:58 ` Dey, Megha
2020-08-06 20:21 ` Thomas Gleixner
2020-08-06 22:27 ` Dey, Megha
2020-08-07 8:48 ` Thomas Gleixner
2020-08-07 12:06 ` Jason Gunthorpe
2020-08-07 12:38 ` gregkh
2020-08-07 13:34 ` Jason Gunthorpe
2020-08-07 16:47 ` Thomas Gleixner
2020-08-07 17:54 ` Dey, Megha
2020-08-07 18:39 ` Jason Gunthorpe
2020-08-07 20:31 ` Dey, Megha
2020-08-08 19:47 ` Thomas Gleixner
2020-08-10 21:46 ` Thomas Gleixner
2020-08-11 9:53 ` Thomas Gleixner
2020-08-11 18:46 ` Dey, Megha
2020-08-11 21:25 ` Thomas Gleixner
2020-08-11 18:39 ` Dey, Megha
2020-08-11 22:39 ` Thomas Gleixner
2020-08-07 15:22 ` Thomas Gleixner
2020-08-05 18:55 ` Dey, Megha
2020-07-21 16:02 ` [PATCH RFC v2 03/18] irq/dev-msi: Create IR-DEV-MSI " Dave Jiang
2020-07-21 16:21 ` Jason Gunthorpe
2020-07-22 17:03 ` Dey, Megha
2020-07-22 17:33 ` Jason Gunthorpe
2020-07-22 20:44 ` Thomas Gleixner
2020-08-05 19:02 ` Dey, Megha
2020-07-21 16:02 ` [PATCH RFC v2 04/18] irq/dev-msi: Introduce APIs to allocate/free dev-msi interrupts Dave Jiang
2020-07-21 16:25 ` Jason Gunthorpe
2020-07-22 17:05 ` Dey, Megha
2020-07-22 17:35 ` Jason Gunthorpe
2020-08-05 20:19 ` Dey, Megha
2020-07-21 16:02 ` [PATCH RFC v2 05/18] dmaengine: idxd: add support for readonly config devices Dave Jiang
2020-07-21 16:02 ` [PATCH RFC v2 06/18] dmaengine: idxd: add interrupt handle request support Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 07/18] dmaengine: idxd: add DEV-MSI support in base driver Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 08/18] dmaengine: idxd: add device support functions in prep for mdev Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 09/18] dmaengine: idxd: add basic mdev registration and helper functions Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 10/18] dmaengine: idxd: add emulation rw routines Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 11/18] dmaengine: idxd: prep for virtual device commands Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 12/18] dmaengine: idxd: virtual device commands emulation Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 13/18] dmaengine: idxd: ims setup for the vdcm Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 14/18] dmaengine: idxd: add mdev type as a new wq type Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 15/18] dmaengine: idxd: add dedicated wq mdev type Dave Jiang
2020-07-21 16:04 ` [PATCH RFC v2 16/18] dmaengine: idxd: add new wq state for mdev Dave Jiang
2020-07-21 16:04 ` [PATCH RFC v2 17/18] dmaengine: idxd: add error notification from host driver to mediated device Dave Jiang
2020-07-21 16:04 ` [PATCH RFC v2 18/18] dmaengine: idxd: add ABI documentation for mediated device support Dave Jiang
2020-07-21 16:28 ` [PATCH RFC v2 00/18] Add VFIO mediated device support and DEV-MSI support for the idxd driver Greg KH
2020-07-21 17:17 ` Dave Jiang
2020-07-21 21:35 ` Dan Williams
2020-07-21 16:45 ` Jason Gunthorpe
2020-07-21 18:00 ` Dave Jiang
2020-07-22 17:31 ` Dey, Megha
2020-07-22 18:16 ` Jason Gunthorpe
2020-07-21 23:54 ` Tian, Kevin
2020-07-24 0:19 ` Jason Gunthorpe
2020-08-06 1:22 ` Alex Williamson
2020-08-07 12:19 ` Jason Gunthorpe
2020-08-10 7:32 ` Tian, Kevin
2020-08-11 17:00 ` Alex Williamson
2020-08-12 1:58 ` Tian, Kevin
2020-08-12 2:36 ` Alex Williamson
2020-08-12 3:35 ` Tian, Kevin
2020-08-12 3:28 ` Jason Wang
2020-08-12 4:05 ` Tian, Kevin
2020-08-13 4:33 ` Jason Wang
2020-08-13 5:26 ` Tian, Kevin
2020-08-13 6:01 ` Jason Wang
2020-08-14 13:23 ` Jason Gunthorpe
2020-08-17 2:24 ` Tian, Kevin
2020-08-14 13:35 ` Jason Gunthorpe
2020-08-17 2:12 ` Tian, Kevin
2020-08-18 0:43 ` Jason Gunthorpe
2020-08-18 1:09 ` Tian, Kevin
2020-08-18 11:50 ` Jason Gunthorpe
2020-08-18 16:27 ` Paolo Bonzini
2020-08-18 16:49 ` Jason Gunthorpe
2020-08-18 17:05 ` Paolo Bonzini
2020-08-18 17:18 ` Jason Gunthorpe
2020-08-19 7:29 ` Tian, Kevin
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