IOMMU: store name for extra reserved device memory

It will be useful for error reporting in a subsequent patch.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

xen/drivers/char/xhci-dbc.c

@@ -1421,7 +1421,8 @@ void __init xhci_dbc_uart_init(void)
         iommu_add_extra_reserved_device_memory(
                 PFN_DOWN(virt_to_maddr(&dbc_dma_bufs)),
                 PFN_UP(sizeof(dbc_dma_bufs)),
-                uart->dbc.sbdf);
+                uart->dbc.sbdf,
+                "XHCI console");
         serial_register_uart(SERHND_XHCI, &dbc_uart_driver, &dbc_uart);
     }
 }

xen/drivers/passthrough/iommu.c

@@ -682,6 +682,7 @@ struct extra_reserved_range {
     unsigned long start;
     unsigned long nr;
     pci_sbdf_t sbdf;
+    const char *name;
 };
 static unsigned int __initdata nr_extra_reserved_ranges;
 static struct extra_reserved_range __initdata
@@ -689,7 +690,8 @@ static struct extra_reserved_range __initdata
 
 int __init iommu_add_extra_reserved_device_memory(unsigned long start,
                                                   unsigned long nr,
-                                                  pci_sbdf_t sbdf)
+                                                  pci_sbdf_t sbdf,
+                                                  const char *name)
 {
     unsigned int idx;
 
@@ -700,6 +702,7 @@ int __init iommu_add_extra_reserved_device_memory(unsigned long start,
     extra_reserved_ranges[idx].start = start;
     extra_reserved_ranges[idx].nr = nr;
     extra_reserved_ranges[idx].sbdf = sbdf;
+    extra_reserved_ranges[idx].name = name;
 
     return 0;
 }

xen/include/xen/iommu.h

@@ -326,7 +326,8 @@ struct iommu_ops {
  */
 extern int iommu_add_extra_reserved_device_memory(unsigned long start,
                                                   unsigned long nr,
-                                                  pci_sbdf_t sbdf);
+                                                  pci_sbdf_t sbdf,
+                                                  const char *name);
 /*
  * To be called by specific IOMMU driver during initialization,
  * to fetch ranges registered with iommu_add_extra_reserved_device_memory().