x86, AMD IOMMU: add pre-allocation of protection domains

This patch adds a function to pre-allocate protection domains. So we don't have
to allocate it on the first request for a device (which can happen in atomic
mode).

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Cc: Sebastian.Biemueller@amd.com
Cc: robert.richter@amd.com
Cc: joro@8bytes.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 34 insertions, 0 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index aab9125ac0b2..bed5f820898d 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -872,3 +872,37 @@ free_mem:
         free_pages((unsigned long)virt_addr, get_order(size));
 }
 
+/*
+ * If the driver core informs the DMA layer if a driver grabs a device
+ * we don't need to preallocate the protection domains anymore.
+ * For now we have to.
+ */
+void prealloc_protection_domains(void)
+{
+        struct pci_dev *dev = NULL;
+        struct dma_ops_domain *dma_dom;
+        struct amd_iommu *iommu;
+        int order = amd_iommu_aperture_order;
+        u16 devid;
+
+        while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
+                devid = (dev->bus->number << 8) | dev->devfn;
+                if (devid >= amd_iommu_last_bdf)
+                        continue;
+                devid = amd_iommu_alias_table[devid];
+                if (domain_for_device(devid))
+                        continue;
+                iommu = amd_iommu_rlookup_table[devid];
+                if (!iommu)
+                        continue;
+                dma_dom = dma_ops_domain_alloc(iommu, order);
+                if (!dma_dom)
+                        continue;
+                init_unity_mappings_for_device(dma_dom, devid);
+                set_device_domain(iommu, &dma_dom->domain, devid);
+                printk(KERN_INFO "AMD IOMMU: Allocated domain %d for device ",
+                       dma_dom->domain.id);
+                print_devid(devid, 1);
+        }
+}
+