From: "Dey, Megha" <megha.dey@intel.com>
To: Jason Gunthorpe <jgg@mellanox.com>, Dave Jiang <dave.jiang@intel.com>
Cc: <vkoul@kernel.org>, <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: Wed, 22 Jul 2020 09:50:47 -0700 [thread overview]
Message-ID: <a99af84f-f3ef-ee3c-1f94-680909e97868@intel.com> (raw)
In-Reply-To: <20200721161344.GA2021248@mellanox.com>
Hi Jason,
On 7/21/2020 9:13 AM, Jason Gunthorpe wrote:
> 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?
Since I have introduced the DEV-MSI domain and related ops, this is
required in the dev_msi_set_hwirq and dev_msi_set_desc in this patch.
>>
>> +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);
> }
>
Sure, I will update this.
>> 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?
Hmmm, fair enough, I will change it to void.
>
> Jason
>
next prev parent reply other threads:[~2020-07-22 16:50 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
2020-07-22 16:50 ` Dey, Megha [this message]
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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