Merge branches 'amd-iommu/fixes' and 'dma-debug/fixes' into iommu/fixes
[muen/linux.git] / arch / x86 / kernel / amd_iommu_init.c
index 1e423b2..c20001e 100644 (file)
@@ -252,7 +252,7 @@ static void iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
 /* Function to enable the hardware */
 static void iommu_enable(struct amd_iommu *iommu)
 {
-       printk(KERN_INFO "AMD IOMMU: Enabling IOMMU at %s cap 0x%hx\n",
+       printk(KERN_INFO "AMD-Vi: Enabling IOMMU at %s cap 0x%hx\n",
               dev_name(&iommu->dev->dev), iommu->cap_ptr);
 
        iommu_feature_enable(iommu, CONTROL_IOMMU_EN);
@@ -434,6 +434,20 @@ static u8 * __init alloc_command_buffer(struct amd_iommu *iommu)
        return cmd_buf;
 }
 
+/*
+ * This function resets the command buffer if the IOMMU stopped fetching
+ * commands from it.
+ */
+void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu)
+{
+       iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
+
+       writel(0x00, iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
+       writel(0x00, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
+
+       iommu_feature_enable(iommu, CONTROL_CMDBUF_EN);
+}
+
 /*
  * This function writes the command buffer address to the hardware and
  * enables it.
@@ -450,11 +464,7 @@ static void iommu_enable_command_buffer(struct amd_iommu *iommu)
        memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET,
                    &entry, sizeof(entry));
 
-       /* set head and tail to zero manually */
-       writel(0x00, iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
-       writel(0x00, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
-
-       iommu_feature_enable(iommu, CONTROL_CMDBUF_EN);
+       amd_iommu_reset_cmd_buffer(iommu);
 }
 
 static void __init free_command_buffer(struct amd_iommu *iommu)
@@ -880,7 +890,7 @@ static int __init init_iommu_all(struct acpi_table_header *table)
                switch (*p) {
                case ACPI_IVHD_TYPE:
 
-                       DUMP_printk("IOMMU: device: %02x:%02x.%01x cap: %04x "
+                       DUMP_printk("device: %02x:%02x.%01x cap: %04x "
                                    "seg: %d flags: %01x info %04x\n",
                                    PCI_BUS(h->devid), PCI_SLOT(h->devid),
                                    PCI_FUNC(h->devid), h->cap_ptr,
@@ -924,7 +934,7 @@ static int __init iommu_setup_msi(struct amd_iommu *iommu)
 
        r = request_irq(iommu->dev->irq, amd_iommu_int_handler,
                        IRQF_SAMPLE_RANDOM,
-                       "AMD IOMMU",
+                       "AMD-Vi",
                        NULL);
 
        if (r) {
@@ -1172,7 +1182,7 @@ int __init amd_iommu_init(void)
 
 
        if (no_iommu) {
-               printk(KERN_INFO "AMD IOMMU disabled by kernel command line\n");
+               printk(KERN_INFO "AMD-Vi disabled by kernel command line\n");
                return 0;
        }
 
@@ -1264,22 +1274,28 @@ int __init amd_iommu_init(void)
        if (ret)
                goto free;
 
-       ret = amd_iommu_init_dma_ops();
+       if (iommu_pass_through)
+               ret = amd_iommu_init_passthrough();
+       else
+               ret = amd_iommu_init_dma_ops();
        if (ret)
                goto free;
 
        enable_iommus();
 
-       printk(KERN_INFO "AMD IOMMU: device isolation ");
+       if (iommu_pass_through)
+               goto out;
+
+       printk(KERN_INFO "AMD-Vi: device isolation ");
        if (amd_iommu_isolate)
                printk("enabled\n");
        else
                printk("disabled\n");
 
        if (amd_iommu_unmap_flush)
-               printk(KERN_INFO "AMD IOMMU: IO/TLB flush on unmap enabled\n");
+               printk(KERN_INFO "AMD-Vi: IO/TLB flush on unmap enabled\n");
        else
-               printk(KERN_INFO "AMD IOMMU: Lazy IO/TLB flushing enabled\n");
+               printk(KERN_INFO "AMD-Vi: Lazy IO/TLB flushing enabled\n");
 
 out:
        return ret;