diff options
| author | Chunyan Zhang <chunyan.zhang@unisoc.com> | 2023-03-31 06:31:24 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2023-03-31 11:13:02 +0300 |
| commit | 816c698c052471f525bea92ff0aeeda8a5844a85 (patch) | |
| tree | 8dd59abafac4f7cc013255c912b913579f050f1b /drivers/iommu/sprd-iommu.c | |
| parent | 9afea57384d4ae7b2034593eac7fa76c7122762a (diff) | |
| download | linux-816c698c052471f525bea92ff0aeeda8a5844a85.tar.xz | |
iommu/sprd: Add support for reattaching an existing domain
This IOMMU driver should allow a domain to be attached more than once.
If IOMMU is reattaching to the same domain which is attached, there's
nothing to be done.
If reattching to a previously-used domain, do not alloc DMA buffer
again which stores address mapping table to avoid memory leak.
Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Link: https://lore.kernel.org/r/20230331033124.864691-3-zhang.lyra@gmail.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/sprd-iommu.c')
| -rw-r--r-- | drivers/iommu/sprd-iommu.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/drivers/iommu/sprd-iommu.c b/drivers/iommu/sprd-iommu.c index 7df1f730c778..3513b2b108bf 100644 --- a/drivers/iommu/sprd-iommu.c +++ b/drivers/iommu/sprd-iommu.c @@ -62,6 +62,7 @@ enum sprd_iommu_version { * @eb: gate clock which controls IOMMU access */ struct sprd_iommu_device { + struct sprd_iommu_domain *dom; enum sprd_iommu_version ver; u32 *prot_page_va; dma_addr_t prot_page_pa; @@ -252,15 +253,27 @@ static int sprd_iommu_attach_device(struct iommu_domain *domain, struct sprd_iommu_domain *dom = to_sprd_domain(domain); size_t pgt_size = sprd_iommu_pgt_size(domain); - if (dom->sdev) - return -EINVAL; + /* The device is attached to this domain */ + if (sdev->dom == dom) + return 0; - dom->pgt_va = dma_alloc_coherent(sdev->dev, pgt_size, &dom->pgt_pa, GFP_KERNEL); - if (!dom->pgt_va) - return -ENOMEM; + /* The first time that domain is attaching to a device */ + if (!dom->pgt_va) { + dom->pgt_va = dma_alloc_coherent(sdev->dev, pgt_size, &dom->pgt_pa, GFP_KERNEL); + if (!dom->pgt_va) + return -ENOMEM; + + dom->sdev = sdev; + } - dom->sdev = sdev; + sdev->dom = dom; + /* + * One sprd IOMMU serves one client device only, disabled it before + * configure mapping table to avoid access conflict in case other + * mapping table is stored in. + */ + sprd_iommu_hw_en(sdev, false); sprd_iommu_first_ppn(dom); sprd_iommu_first_vpn(dom); sprd_iommu_vpn_range(dom); |