hw/arm/smmu-common: IOMMU memory region and address space setup

We set up the infrastructure to enumerate all the PCI devices
attached to the SMMU and create an associated IOMMU memory
region and address space.

Those info are stored in SMMUDevice objects. The devices are
grouped according to the PCIBus they belong to. A hash table
indexed by the PCIBus pointer is used. Also an array indexed by
the bus number allows to find the list of SMMUDevices.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Prem Mallappa <prem.mallappa@broadcom.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1524665762-31355-3-git-send-email-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/hw/arm/smmu-common.c b/hw/arm/smmu-common.c
index e086ff52a5f57f30d0356385ee19f3a9e116c74d..3d64bcfac2f755312fe36e0f4eaca2bd6e6f4a82 100644 (file)
--- a/hw/arm/smmu-common.c
+++ b/hw/arm/smmu-common.c
@@ -28,8 +28,69 @@
 #include "qemu/error-report.h"
 #include "hw/arm/smmu-common.h"
 
+/**
+ * The bus number is used for lookup when SID based invalidation occurs.
+ * In that case we lazily populate the SMMUPciBus array from the bus hash
+ * table. At the time the SMMUPciBus is created (smmu_find_add_as), the bus
+ * numbers may not be always initialized yet.
+ */
+SMMUPciBus *smmu_find_smmu_pcibus(SMMUState *s, uint8_t bus_num)
+{
+    SMMUPciBus *smmu_pci_bus = s->smmu_pcibus_by_bus_num[bus_num];
+
+    if (!smmu_pci_bus) {
+        GHashTableIter iter;
+
+        g_hash_table_iter_init(&iter, s->smmu_pcibus_by_busptr);
+        while (g_hash_table_iter_next(&iter, NULL, (void **)&smmu_pci_bus)) {
+            if (pci_bus_num(smmu_pci_bus->bus) == bus_num) {
+                s->smmu_pcibus_by_bus_num[bus_num] = smmu_pci_bus;
+                return smmu_pci_bus;
+            }
+        }
+    }
+    return smmu_pci_bus;
+}
+
+static AddressSpace *smmu_find_add_as(PCIBus *bus, void *opaque, int devfn)
+{
+    SMMUState *s = opaque;
+    SMMUPciBus *sbus = g_hash_table_lookup(s->smmu_pcibus_by_busptr, bus);
+    SMMUDevice *sdev;
+
+    if (!sbus) {
+        sbus = g_malloc0(sizeof(SMMUPciBus) +
+                         sizeof(SMMUDevice *) * SMMU_PCI_DEVFN_MAX);
+        sbus->bus = bus;
+        g_hash_table_insert(s->smmu_pcibus_by_busptr, bus, sbus);
+    }
+
+    sdev = sbus->pbdev[devfn];
+    if (!sdev) {
+        char *name = g_strdup_printf("%s-%d-%d",
+                                     s->mrtypename,
+                                     pci_bus_num(bus), devfn);
+        sdev = sbus->pbdev[devfn] = g_new0(SMMUDevice, 1);
+
+        sdev->smmu = s;
+        sdev->bus = bus;
+        sdev->devfn = devfn;
+
+        memory_region_init_iommu(&sdev->iommu, sizeof(sdev->iommu),
+                                 s->mrtypename,
+                                 OBJECT(s), name, 1ULL << SMMU_MAX_VA_BITS);
+        address_space_init(&sdev->as,
+                           MEMORY_REGION(&sdev->iommu), name);
+        trace_smmu_add_mr(name);
+        g_free(name);
+    }
+
+    return &sdev->as;
+}
+
 static void smmu_base_realize(DeviceState *dev, Error **errp)
 {
+    SMMUState *s = ARM_SMMU(dev);
     SMMUBaseClass *sbc = ARM_SMMU_GET_CLASS(dev);
     Error *local_err = NULL;
 
@@ -38,6 +99,14 @@ static void smmu_base_realize(DeviceState *dev, Error **errp)
         error_propagate(errp, local_err);
         return;
     }
+
+    s->smmu_pcibus_by_busptr = g_hash_table_new(NULL, NULL);
+
+    if (s->primary_bus) {
+        pci_setup_iommu(s->primary_bus, smmu_find_add_as, s);
+    } else {
+        error_setg(errp, "SMMU is not attached to any PCI bus!");
+    }
 }
 
 static void smmu_base_reset(DeviceState *dev)

diff --git a/hw/arm/trace-events b/hw/arm/trace-events
index 193063ed9939b99578575156b558953c044b3498..8e8b53c95d9c260fcfccebde0baa2c093b06990b 100644 (file)
--- a/hw/arm/trace-events
+++ b/hw/arm/trace-events
@@ -2,3 +2,6 @@
 
 # hw/arm/virt-acpi-build.c
 virt_acpi_setup(void) "No fw cfg or ACPI disabled. Bailing out."
+
+# hw/arm/smmu-common.c
+smmu_add_mr(const char *name) "%s"
\ No newline at end of file

diff --git a/include/hw/arm/smmu-common.h b/include/hw/arm/smmu-common.h
index d682be82d27637765d6335abe39dabd53c2d8629..8b947774b0b72663ef76e36ba34e10f015860f18 100644 (file)
--- a/include/hw/arm/smmu-common.h
+++ b/include/hw/arm/smmu-common.h
@@ -120,4 +120,12 @@ typedef struct {
 #define ARM_SMMU_GET_CLASS(obj)                              \
     OBJECT_GET_CLASS(SMMUBaseClass, (obj), TYPE_ARM_SMMU)
 
+/* Return the SMMUPciBus handle associated to a PCI bus number */
+SMMUPciBus *smmu_find_smmu_pcibus(SMMUState *s, uint8_t bus_num);
+
+/* Return the stream ID of an SMMU device */
+static inline uint16_t smmu_get_sid(SMMUDevice *sdev)
+{
+    return PCI_BUILD_BDF(pci_bus_num(sdev->bus), sdev->devfn);
+}
 #endif  /* HW_ARM_SMMU_COMMON */