diff options
Diffstat (limited to 'drivers/iommu/amd/init.c')
| -rw-r--r-- | drivers/iommu/amd/init.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c index 4b2953418977..106ee3cf3038 100644 --- a/drivers/iommu/amd/init.c +++ b/drivers/iommu/amd/init.c @@ -1136,9 +1136,13 @@ static void set_dte_bit(struct dev_table_entry *dte, u8 bit) static bool __reuse_device_table(struct amd_iommu *iommu) { struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg; - u32 lo, hi, old_devtb_size; + struct dev_table_entry *old_dev_tbl_entry; + u32 lo, hi, old_devtb_size, devid; phys_addr_t old_devtb_phys; + u16 dom_id; + bool dte_v; u64 entry; + int ret; /* Each IOMMU use separate device table with the same size */ lo = readl(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET); @@ -1173,6 +1177,23 @@ static bool __reuse_device_table(struct amd_iommu *iommu) return false; } + for (devid = 0; devid <= pci_seg->last_bdf; devid++) { + old_dev_tbl_entry = &pci_seg->old_dev_tbl_cpy[devid]; + dte_v = FIELD_GET(DTE_FLAG_V, old_dev_tbl_entry->data[0]); + dom_id = FIELD_GET(DEV_DOMID_MASK, old_dev_tbl_entry->data[1]); + + if (!dte_v || !dom_id) + continue; + /* + * ID reservation can fail with -ENOSPC when there + * are multiple devices present in the same domain, + * hence check only for -ENOMEM. + */ + ret = ida_alloc_range(&pdom_ids, dom_id, dom_id, GFP_KERNEL); + if (ret == -ENOMEM) + return false; + } + return true; } |