From: Nicolin Chen <nicolinc@nvidia.com>
To: Baolu Lu <baolu.lu@linux.intel.com>
Cc: Yi Liu <yi.l.liu@intel.com>, <joro@8bytes.org>,
<alex.williamson@redhat.com>, <jgg@nvidia.com>,
<kevin.tian@intel.com>, <robin.murphy@arm.com>,
<cohuck@redhat.com>, <eric.auger@redhat.com>,
<kvm@vger.kernel.org>, <mjrosato@linux.ibm.com>,
<chao.p.peng@linux.intel.com>, <yi.y.sun@linux.intel.com>,
<peterx@redhat.com>, <jasowang@redhat.com>,
<shameerali.kolothum.thodi@huawei.com>, <lulu@redhat.com>,
<suravee.suthikulpanit@amd.com>, <iommu@lists.linux.dev>,
<linux-kernel@vger.kernel.org>, <linux-kselftest@vger.kernel.org>
Subject: Re: [PATCH 08/12] iommufd/device: Report supported hwpt_types
Date: Thu, 9 Mar 2023 23:10:02 -0800 [thread overview]
Message-ID: <ZArXyj3iiPa95aCu@Asurada-Nvidia> (raw)
In-Reply-To: <f0076d6a-d764-b018-7442-08a6293f9553@linux.intel.com>
On Fri, Mar 10, 2023 at 11:30:04AM +0800, Baolu Lu wrote:
> External email: Use caution opening links or attachments
>
>
> On 3/9/23 4:09 PM, Yi Liu wrote:
> > This provides a way for userspace to probe the supported hwpt data
> > types by kernel. Currently, kernel only supports IOMMU_HWPT_TYPE_DEFAULT,
> > new types would be added per vendor drivers' extension.
> >
> > Userspace that wants to allocate hw_pagetable with user data should check
> > this. While for the allocation without user data, no need for it. It is
> > supported by default.
> >
> > Co-developed-by: Nicolin Chen <nicolinc@nvidia.com>
> > Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
> > Signed-off-by: Yi Liu <yi.l.liu@intel.com>
> > ---
> > drivers/iommu/iommufd/device.c | 1 +
> > drivers/iommu/iommufd/hw_pagetable.c | 18 +++++++++++++++---
> > drivers/iommu/iommufd/iommufd_private.h | 2 ++
> > drivers/iommu/iommufd/main.c | 2 +-
> > include/uapi/linux/iommufd.h | 8 ++++++++
> > 5 files changed, 27 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
> > index 19cd6df46c6a..0328071dcac1 100644
> > --- a/drivers/iommu/iommufd/device.c
> > +++ b/drivers/iommu/iommufd/device.c
> > @@ -322,6 +322,7 @@ int iommufd_device_get_hw_info(struct iommufd_ucmd *ucmd)
> >
> > cmd->out_data_type = ops->driver_type;
> > cmd->data_len = length;
> > + cmd->out_hwpt_type_bitmap = iommufd_hwpt_type_bitmaps[ops->driver_type];
> >
> > rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd));
> >
> > diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c
> > index 67facca98de1..160712256c64 100644
> > --- a/drivers/iommu/iommufd/hw_pagetable.c
> > +++ b/drivers/iommu/iommufd/hw_pagetable.c
> > @@ -173,6 +173,14 @@ static const size_t iommufd_hwpt_alloc_data_size[] = {
> > [IOMMU_HWPT_TYPE_DEFAULT] = 0,
> > };
> >
> > +/*
> > + * bitmaps of supported hwpt types of by underlying iommu, indexed
> > + * by ops->driver_type which is one of enum iommu_hw_info_type.
> > + */
> > +const u64 iommufd_hwpt_type_bitmaps[] = {
> > + [IOMMU_HW_INFO_TYPE_DEFAULT] = BIT_ULL(IOMMU_HWPT_TYPE_DEFAULT),
> > +};
>
> I am a bit confused here. Why do you need this array? What I read is
> that you want to convert ops->driver_type to a bit position in
> cmd->out_hwpt_type_bitmap.
>
> Am I getting it right?
>
> If so, why not just
> cmd->out_hwpt_type_bitmap = BIT_ULL(ops->driver_type);
>
> ?
A driver_type would be IOMMUFD_HW_INFO_TYPExx. What's inside the
BIT_ULL is IOMMUFD_HWPT_TYPE_*. It seems to get a bit confusing
after several rounds of renaming though. And they do seem to be
a bit of duplications at the actual values, at least for now.
I recall that we only had one enum for the types, yet later did
a separation into driver_types and hwpt_types after a discussion
regarding future PASID support?
Thanks
Nic
next prev parent reply other threads:[~2023-03-10 7:10 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-09 8:08 [PATCH 00/12] iommufd: Add nesting infrastructure Yi Liu
2023-03-09 8:08 ` [PATCH 01/12] iommu: Add new iommu op to create domains owned by userspace Yi Liu
2023-03-10 0:56 ` Jason Gunthorpe
2023-03-29 10:56 ` Liu, Yi L
2023-04-13 0:44 ` Nicolin Chen
2023-04-13 11:37 ` Jason Gunthorpe
2023-04-13 15:25 ` Nicolin Chen
2023-03-09 8:09 ` [PATCH 02/12] iommu: Add nested domain support Yi Liu
2023-03-17 10:25 ` Tian, Kevin
2023-03-18 8:34 ` Baolu Lu
2023-03-09 8:09 ` [PATCH 03/12] iommufd/hw_pagetable: Use domain_alloc_user op for domain allocation Yi Liu
2023-03-10 1:17 ` Baolu Lu
2023-03-09 8:09 ` [PATCH 04/12] iommufd: Pass parent hwpt and user_data to iommufd_hw_pagetable_alloc() Yi Liu
2023-03-10 2:10 ` Baolu Lu
2023-03-10 17:49 ` Jason Gunthorpe
2023-03-17 10:23 ` Tian, Kevin
2023-03-20 12:47 ` Jason Gunthorpe
2023-03-21 1:25 ` Tian, Kevin
2023-03-09 8:09 ` [PATCH 05/12] iommufd/hw_pagetable: Do not populate user-managed hw_pagetables Yi Liu
2023-03-10 2:25 ` Baolu Lu
2023-03-10 6:50 ` Nicolin Chen
2023-03-10 12:51 ` Baolu Lu
2023-03-23 8:06 ` Liu, Yi L
2023-03-23 8:12 ` Nicolin Chen
2023-03-23 8:28 ` Liu, Yi L
2023-03-10 15:29 ` Jason Gunthorpe
2023-03-10 23:31 ` Nicolin Chen
2023-03-09 8:09 ` [PATCH 06/12] iommufd: IOMMU_HWPT_ALLOC allocation with user data Yi Liu
2023-03-10 3:02 ` Baolu Lu
2023-03-23 8:11 ` Liu, Yi L
2023-03-09 8:09 ` [PATCH 07/12] iommufd: Add IOMMU_HWPT_INVALIDATE Yi Liu
2023-03-10 3:15 ` Baolu Lu
2023-03-14 4:12 ` Liu, Yi L
2023-03-10 17:50 ` Jason Gunthorpe
2023-03-14 4:14 ` Liu, Yi L
2023-03-14 4:18 ` Liu, Yi L
2023-03-20 12:48 ` Jason Gunthorpe
2023-03-09 8:09 ` [PATCH 08/12] iommufd/device: Report supported hwpt_types Yi Liu
2023-03-10 3:30 ` Baolu Lu
2023-03-10 7:10 ` Nicolin Chen [this message]
2023-03-10 7:39 ` Liu, Yi L
2023-03-10 7:45 ` Nicolin Chen
2023-03-10 17:52 ` Jason Gunthorpe
2023-03-23 8:08 ` Liu, Yi L
2023-03-09 8:09 ` [PATCH 09/12] iommufd/selftest: Add domain_alloc_user() support in iommu mock Yi Liu
2023-03-09 8:09 ` [PATCH 10/12] iommufd/selftest: Add coverage for IOMMU_HWPT_ALLOC with user data Yi Liu
2023-03-09 8:09 ` [PATCH 11/12] iommufd/selftest: Add IOMMU_TEST_OP_MD_CHECK_IOTLB test op Yi Liu
2023-03-09 8:09 ` [PATCH 12/12] iommufd/selftest: Add coverage for IOMMU_HWPT_INVALIDATE ioctl Yi Liu
2023-03-09 14:02 ` [PATCH 00/12] iommufd: Add nesting infrastructure Baolu Lu
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