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Message-ID: <20231031161214.25560598@canb.auug.org.au>
Date: Tue, 31 Oct 2023 16:12:14 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: Joerg Roedel <joro@...tes.org>,
Joao Martins <joao.m.martins@...cle.com>,
Joerg Roedel <jroedel@...e.de>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux Next Mailing List <linux-next@...r.kernel.org>,
Nicolin Chen <nicolinc@...dia.com>, Yi Liu <yi.l.liu@...el.com>
Subject: Re: linux-next: manual merge of the iommufd tree with the iommu
tree
Hi all,
On Mon, 30 Oct 2023 15:26:21 -0300 Jason Gunthorpe <jgg@...dia.com> wrote:
>
> On Fri, Oct 27, 2023 at 05:15:22PM +1100, Stephen Rothwell wrote:
> >
> > On Fri, 27 Oct 2023 15:55:22 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> > >
> > > Today's linux-next merge of the iommufd tree got a conflict in:
> > >
> > > drivers/iommu/iommufd/selftest.c
> > >
> > > between commits:
> > >
> > > 1c68cbc64fe6 ("iommu: Add IOMMU_DOMAIN_PLATFORM")
> > > 13fbceb1b8e9 ("iommufd: Convert to alloc_domain_paging()")
> > >
> > > from the iommu tree and commits:
> > >
> > > 408663619fcf ("iommufd/selftest: Add domain_alloc_user() support in iommu mock")
> > > 266ce58989ba ("iommufd/selftest: Test IOMMU_HWPT_ALLOC_DIRTY_TRACKING")
> > > 7adf267d66d1 ("iommufd/selftest: Test IOMMU_HWPT_SET_DIRTY_TRACKING")
> > > a9af47e382a4 ("iommufd/selftest: Test IOMMU_HWPT_GET_DIRTY_BITMAP")
> > > 0795b305da89 ("iommufd/selftest: Test IOMMU_HWPT_GET_DIRTY_BITMAP_NO_CLEAR flag")
> > > 65fe32f7a447 ("iommufd/selftest: Add nested domain allocation for mock domain")
> > >
> > > from the iommufd tree.
> > >
> > > I fixed it up (see below) and can carry the fix as necessary. This
> > > is now fixed as far as linux-next is concerned, but any non trivial
> > > conflicts should be mentioned to your upstream maintainer when your tree
> > > is submitted for merging. You may also want to consider cooperating
> > > with the maintainer of the conflicting tree to minimise any particularly
> > > complex conflicts.
> >
> > The resolution should have been as below (I think).
>
> This was too horrible, I pushed a patch to reorganize the new iommufd side
> code to more closely match how the domain_alloc_paging stuff is
> supposed to work
I have used the conflict resolution below now.
--
Cheers,
Stephen Rothwell
diff --cc drivers/iommu/iommufd/selftest.c
index ee6079847091,d43a87737c1e..5d93434003d8
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@@ -155,6 -240,81 +235,72 @@@ static struct iommu_domain *mock_domain
return &mock->domain;
}
+ static struct iommu_domain *
+ __mock_domain_alloc_nested(struct mock_iommu_domain *mock_parent,
+ const struct iommu_hwpt_selftest *user_cfg)
+ {
+ struct mock_iommu_domain_nested *mock_nested;
+ int i;
+
+ mock_nested = kzalloc(sizeof(*mock_nested), GFP_KERNEL);
+ if (!mock_nested)
+ return ERR_PTR(-ENOMEM);
+ mock_nested->parent = mock_parent;
+ mock_nested->domain.ops = &domain_nested_ops;
+ mock_nested->domain.type = IOMMU_DOMAIN_NESTED;
+ for (i = 0; i < MOCK_NESTED_DOMAIN_IOTLB_NUM; i++)
+ mock_nested->iotlb[i] = user_cfg->iotlb;
+ return &mock_nested->domain;
+ }
+
-static struct iommu_domain *mock_domain_alloc(unsigned int iommu_domain_type)
-{
- if (iommu_domain_type == IOMMU_DOMAIN_BLOCKED)
- return &mock_blocking_domain;
- if (iommu_domain_type == IOMMU_DOMAIN_UNMANAGED)
- return mock_domain_alloc_paging(NULL);
- return NULL;
-}
-
+ static struct iommu_domain *
+ mock_domain_alloc_user(struct device *dev, u32 flags,
+ struct iommu_domain *parent,
+ const struct iommu_user_data *user_data)
+ {
+ struct mock_iommu_domain *mock_parent;
+ struct iommu_hwpt_selftest user_cfg;
+ int rc;
+
+ /* must be mock_domain */
+ if (!parent) {
+ struct mock_dev *mdev = container_of(dev, struct mock_dev, dev);
+ bool has_dirty_flag = flags & IOMMU_HWPT_ALLOC_DIRTY_TRACKING;
+ bool no_dirty_ops = mdev->flags & MOCK_FLAGS_DEVICE_NO_DIRTY;
+ struct iommu_domain *domain;
+
+ if (flags & (~(IOMMU_HWPT_ALLOC_NEST_PARENT |
+ IOMMU_HWPT_ALLOC_DIRTY_TRACKING)))
+ return ERR_PTR(-EOPNOTSUPP);
+ if (user_data || (has_dirty_flag && no_dirty_ops))
+ return ERR_PTR(-EOPNOTSUPP);
+ domain = mock_domain_alloc_paging(NULL);
+ if (!domain)
+ return ERR_PTR(-ENOMEM);
+ if (has_dirty_flag)
+ container_of(domain, struct mock_iommu_domain, domain)
+ ->domain.dirty_ops = &dirty_ops;
+ return domain;
+ }
+
+ /* must be mock_domain_nested */
+ if (user_data->type != IOMMU_HWPT_DATA_SELFTEST || flags)
+ return ERR_PTR(-EOPNOTSUPP);
+ if (!parent || parent->ops != mock_ops.default_domain_ops)
+ return ERR_PTR(-EINVAL);
+
+ mock_parent = container_of(parent, struct mock_iommu_domain, domain);
+ if (!mock_parent)
+ return ERR_PTR(-EINVAL);
+
+ rc = iommu_copy_struct_from_user(&user_cfg, user_data,
+ IOMMU_HWPT_DATA_SELFTEST, iotlb);
+ if (rc)
+ return ERR_PTR(rc);
+
+ return __mock_domain_alloc_nested(mock_parent, &user_cfg);
+ }
+
static void mock_domain_free(struct iommu_domain *domain)
{
struct mock_iommu_domain *mock =
@@@ -272,9 -432,28 +418,20 @@@ static phys_addr_t mock_domain_iova_to_
static bool mock_domain_capable(struct device *dev, enum iommu_cap cap)
{
- return cap == IOMMU_CAP_CACHE_COHERENCY;
+ struct mock_dev *mdev = container_of(dev, struct mock_dev, dev);
+
+ switch (cap) {
+ case IOMMU_CAP_CACHE_COHERENCY:
+ return true;
+ case IOMMU_CAP_DIRTY_TRACKING:
+ return !(mdev->flags & MOCK_FLAGS_DEVICE_NO_DIRTY);
+ default:
+ break;
+ }
+
+ return false;
}
-static void mock_domain_set_plaform_dma_ops(struct device *dev)
-{
- /*
- * mock doesn't setup default domains because we can't hook into the
- * normal probe path
- */
-}
-
static struct iommu_device mock_iommu_device = {
};
@@@ -293,8 -466,10 +450,9 @@@ static const struct iommu_ops mock_ops
.owner = THIS_MODULE,
.pgsize_bitmap = MOCK_IO_PAGE_SIZE,
.hw_info = mock_domain_hw_info,
- .domain_alloc = mock_domain_alloc,
+ .domain_alloc_paging = mock_domain_alloc_paging,
+ .domain_alloc_user = mock_domain_alloc_user,
.capable = mock_domain_capable,
- .set_platform_dma_ops = mock_domain_set_plaform_dma_ops,
.device_group = generic_device_group,
.probe_device = mock_probe_device,
.default_domain_ops =
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