diff options
| author | Baoquan He <bhe@redhat.com> | 2017-08-09 11:33:41 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2017-08-15 19:14:39 +0300 |
| commit | df3f7a6e8e855e4ff533508807cd7c3723faa51f (patch) | |
| tree | 454b1a92a433b8b63bb1f820f829dff32a62f337 /drivers/iommu | |
| parent | e01d1913b0d0817191418381a6fcebaa01abde2a (diff) | |
| download | linux-df3f7a6e8e855e4ff533508807cd7c3723faa51f.tar.xz | |
iommu/amd: Use is_attach_deferred call-back
Implement call-back is_attach_deferred and use it to defer the
domain attach from iommu driver init to device driver init when
iommu is pre-enabled in kdump kernel.
Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index dab901b4f0f9..eebf4590cef9 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -121,6 +121,7 @@ struct iommu_dev_data { PPR completions */ u32 errata; /* Bitmap for errata to apply */ bool use_vapic; /* Enable device to use vapic mode */ + bool defer_attach; struct ratelimit_state rs; /* Ratelimit IOPF messages */ }; @@ -371,12 +372,17 @@ static u16 get_alias(struct device *dev) static struct iommu_dev_data *find_dev_data(u16 devid) { struct iommu_dev_data *dev_data; + struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; dev_data = search_dev_data(devid); - if (dev_data == NULL) + if (dev_data == NULL) { dev_data = alloc_dev_data(devid); + if (translation_pre_enabled(iommu)) + dev_data->defer_attach = true; + } + return dev_data; } @@ -2477,11 +2483,18 @@ static struct iommu_group *amd_iommu_device_group(struct device *dev) static struct protection_domain *get_domain(struct device *dev) { struct protection_domain *domain; + struct iommu_domain *io_domain; if (!check_device(dev)) return ERR_PTR(-EINVAL); domain = get_dev_data(dev)->domain; + if (domain == NULL && get_dev_data(dev)->defer_attach) { + get_dev_data(dev)->defer_attach = false; + io_domain = iommu_get_domain_for_dev(dev); + domain = to_pdomain(io_domain); + attach_device(dev, domain); + } if (!dma_ops_domain(domain)) return ERR_PTR(-EBUSY); @@ -3372,6 +3385,13 @@ static void amd_iommu_apply_resv_region(struct device *dev, WARN_ON_ONCE(reserve_iova(&dma_dom->iovad, start, end) == NULL); } +static bool amd_iommu_is_attach_deferred(struct iommu_domain *domain, + struct device *dev) +{ + struct iommu_dev_data *dev_data = dev->archdata.iommu; + return dev_data->defer_attach; +} + const struct iommu_ops amd_iommu_ops = { .capable = amd_iommu_capable, .domain_alloc = amd_iommu_domain_alloc, @@ -3388,6 +3408,7 @@ const struct iommu_ops amd_iommu_ops = { .get_resv_regions = amd_iommu_get_resv_regions, .put_resv_regions = amd_iommu_put_resv_regions, .apply_resv_region = amd_iommu_apply_resv_region, + .is_attach_deferred = amd_iommu_is_attach_deferred, .pgsize_bitmap = AMD_IOMMU_PGSIZES, }; |