From: "Dey, Megha" <megha.dey@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
"Jiang, Dave" <dave.jiang@intel.com>,
"vkoul@kernel.org" <vkoul@kernel.org>,
"maz@kernel.org" <maz@kernel.org>,
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"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"Pan, Jacob jun" <jacob.jun.pan@intel.com>,
"Raj, Ashok" <ashok.raj@intel.com>,
"jgg@mellanox.com" <jgg@mellanox.com>,
"Liu, Yi L" <yi.l.liu@intel.com>,
"Lu, Baolu" <baolu.lu@intel.com>,
"Tian, Kevin" <kevin.tian@intel.com>,
"Kumar, Sanjay K" <sanjay.k.kumar@intel.com>,
"Luck, Tony" <tony.luck@intel.com>,
"Lin, Jing" <jing.lin@intel.com>,
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Cc: "dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
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Subject: RE: [PATCH RFC v2 03/18] irq/dev-msi: Create IR-DEV-MSI irq domain
Date: Wed, 5 Aug 2020 19:02:35 +0000 [thread overview]
Message-ID: <ec81670539674beea58c9a6c4104b26b@intel.com> (raw)
In-Reply-To: <87lfjbz3cs.fsf@nanos.tec.linutronix.de>
Hi Thomas,
> -----Original Message-----
> From: Thomas Gleixner <tglx@linutronix.de>
> Sent: Wednesday, July 22, 2020 1:45 PM
> To: Jiang, Dave <dave.jiang@intel.com>; vkoul@kernel.org; Dey, Megha
> <megha.dey@intel.com>; maz@kernel.org; bhelgaas@google.com;
> rafael@kernel.org; gregkh@linuxfoundation.org; hpa@zytor.com;
> alex.williamson@redhat.com; Pan, Jacob jun <jacob.jun.pan@intel.com>; Raj,
> Ashok <ashok.raj@intel.com>; jgg@mellanox.com; Liu, Yi L <yi.l.liu@intel.com>;
> Lu, Baolu <baolu.lu@intel.com>; Tian, Kevin <kevin.tian@intel.com>; Kumar,
> Sanjay K <sanjay.k.kumar@intel.com>; Luck, Tony <tony.luck@intel.com>; Lin,
> Jing <jing.lin@intel.com>; Williams, Dan J <dan.j.williams@intel.com>;
> kwankhede@nvidia.com; eric.auger@redhat.com; parav@mellanox.com;
> jgg@mellanox.com; rafael@kernel.org; Hansen, Dave
> <dave.hansen@intel.com>; netanelg@mellanox.com; shahafs@mellanox.com;
> yan.y.zhao@linux.intel.com; pbonzini@redhat.com; Ortiz, Samuel
> <samuel.ortiz@intel.com>; Hossain, Mona <mona.hossain@intel.com>
> Cc: 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 03/18] irq/dev-msi: Create IR-DEV-MSI irq domain
>
> Dave Jiang <dave.jiang@intel.com> writes:
> > From: Megha Dey <megha.dey@intel.com>
> >
> > When DEV_MSI is enabled, the dev_msi_default_domain is updated to the
> > base DEV-MSI irq domain. If interrupt remapping is enabled, we create
>
> s/we//
ok
>
> > a new IR-DEV-MSI irq domain and update the dev_msi_default domain to
> > the same.
> >
> > For X86, introduce a new irq_alloc_type which will be used by the
> > interrupt remapping driver.
> >
> > 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 | 1 +
> > arch/x86/kernel/apic/msi.c | 12 ++++++
> > drivers/base/dev-msi.c | 66 +++++++++++++++++++++++++++++++----
> > drivers/iommu/intel/irq_remapping.c | 11 +++++-
> > include/linux/intel-iommu.h | 1 +
> > include/linux/irqdomain.h | 11 ++++++
> > include/linux/msi.h | 3 ++
>
> Why is this mixing generic code, x86 core code and intel specific driver code?
> This is new functionality so:
>
> 1) Provide the infrastructure
> 2) Add support to architecture specific parts
> 3) Enable it
Ok, I will try to adhere to the layering next time around..
>
> > +
> > +#ifdef CONFIG_DEV_MSI
> > +int dev_msi_prepare(struct irq_domain *domain, struct device *dev,
> > + int nvec, msi_alloc_info_t *arg) {
> > + memset(arg, 0, sizeof(*arg));
> > +
> > + arg->type = X86_IRQ_ALLOC_TYPE_DEV_MSI;
> > +
> > + return 0;
> > +}
> > +#endif
>
> What is this? Tons of new lines for taking up more space and not a single
> comment.
Hmm, I will add a comment..
>
> > -static int dev_msi_prepare(struct irq_domain *domain, struct device
> > *dev,
> > +int __weak dev_msi_prepare(struct irq_domain *domain, struct device
> > +*dev,
> > int nvec, msi_alloc_info_t *arg) {
> > memset(arg, 0, sizeof(*arg));
>
> Oh well. So every architecure which needs to override this and I assume all
> which are eventually going to support it need to do the memset() in their
> override.
>
> memset(arg,,,);
> arch_dev_msi_prepare();
>
>
Per you suggestion, I have introduced arch_dev_msi_prepare which returns 0 by default unless
overridden by arch code in the next patch set.
> > - dev_msi_default_domain = msi_create_irq_domain(fn,
> &dev_msi_domain_info, parent);
> > + /*
> > + * This initcall may come after remap code is initialized. Ensure that
> > + * dev_msi_default domain is updated correctly.
>
> What? No, this is a disgusting hack. Get your ordering straight, that's not rocket
> science.
>
Hmm yeah, actually I realized we don't really need to have 2 new IRQ domains for dev-msi
(with and without interrupt remapping enabled). Hence all this will go away in the next round
of patches.
> > +#ifdef CONFIG_IRQ_REMAP
>
> IRQ_REMAP is x86 specific. Is this file x86 only or intended to be for general use?
> If it's x86 only, then this should be clearly documented. If not, then these
> x86'isms have no place here.
True, I will take care of this in the next patch set.
>
> > +struct irq_domain *create_remap_dev_msi_irq_domain(struct irq_domain
> *parent,
> > + const char *name)
>
> So we have msi_create_irq_domain() and this is about dev_msi, right? So can
> you please stick with a consistent naming scheme?
sure
>
> > +{
> > + struct fwnode_handle *fn;
> > + struct irq_domain *domain;
> > +
> > + fn = irq_domain_alloc_named_fwnode(name);
> > + if (!fn)
> > + return NULL;
> > +
> > + domain = msi_create_irq_domain(fn, &dev_msi_ir_domain_info,
> parent);
> > + if (!domain) {
> > + pr_warn("failed to initialize irqdomain for IR-DEV-MSI.\n");
> > + return ERR_PTR(-ENXIO);
> > + }
> > +
> > + irq_domain_update_bus_token(domain,
> DOMAIN_BUS_PLATFORM_MSI);
> > +
> > + if (!dev_msi_default_domain)
> > + dev_msi_default_domain = domain;
>
> Can this be called several times? If so, then this lacks a comment. If not, then
> this condition is useless.
Hmm this will go way in the next patch set, thank you for your input!
>
> Thanks,
>
> tglx
next prev parent reply other threads:[~2020-08-05 19:04 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
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 [this message]
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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