X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fxen%2Ftpmback%2Finterface.c;fp=drivers%2Fxen%2Ftpmback%2Finterface.c;h=0105bd93bfb90d150b710cd7fd136cfbdb782d2c;hb=1db395853d4f30d6120458bd279ede1f882a8525;hp=0000000000000000000000000000000000000000;hpb=34a75f0025b9cf803b6a88db032e6ad6950c9313;p=linux-2.6.git

diff --git a/drivers/xen/tpmback/interface.c b/drivers/xen/tpmback/interface.c
new file mode 100644
index 000000000..0105bd93b
--- /dev/null
+++ b/drivers/xen/tpmback/interface.c
@@ -0,0 +1,177 @@
+ /*****************************************************************************
+ * drivers/xen/tpmback/interface.c
+ *
+ * Vritual TPM interface management.
+ *
+ * Copyright (c) 2005, IBM Corporation
+ *
+ * Author: Stefan Berger, stefanb@us.ibm.com
+ *
+ * This code has been derived from drivers/xen/netback/interface.c
+ * Copyright (c) 2004, Keir Fraser
+ */
+
+#include "common.h"
+#include <xen/balloon.h>
+#include <xen/gnttab.h>
+
+static kmem_cache_t *tpmif_cachep;
+int num_frontends = 0;
+
+LIST_HEAD(tpmif_list);
+
+static tpmif_t *alloc_tpmif(domid_t domid, struct backend_info *bi)
+{
+	tpmif_t *tpmif;
+
+	tpmif = kmem_cache_alloc(tpmif_cachep, GFP_KERNEL);
+	if (!tpmif)
+		return ERR_PTR(-ENOMEM);
+
+	memset(tpmif, 0, sizeof (*tpmif));
+	tpmif->domid = domid;
+	tpmif->status = DISCONNECTED;
+	tpmif->bi = bi;
+	snprintf(tpmif->devname, sizeof(tpmif->devname), "tpmif%d", domid);
+	atomic_set(&tpmif->refcnt, 1);
+
+	tpmif->pagerange = balloon_alloc_empty_page_range(TPMIF_TX_RING_SIZE);
+	BUG_ON(tpmif->pagerange == NULL);
+	tpmif->mmap_vstart = (unsigned long)pfn_to_kaddr(
+	                                    page_to_pfn(tpmif->pagerange));
+
+	list_add(&tpmif->tpmif_list, &tpmif_list);
+	num_frontends++;
+
+	return tpmif;
+}
+
+static void free_tpmif(tpmif_t * tpmif)
+{
+	num_frontends--;
+	list_del(&tpmif->tpmif_list);
+	balloon_dealloc_empty_page_range(tpmif->pagerange, TPMIF_TX_RING_SIZE);
+	kmem_cache_free(tpmif_cachep, tpmif);
+}
+
+tpmif_t *tpmif_find(domid_t domid, struct backend_info *bi)
+{
+	tpmif_t *tpmif;
+
+	list_for_each_entry(tpmif, &tpmif_list, tpmif_list) {
+		if (tpmif->bi == bi) {
+			if (tpmif->domid == domid) {
+				tpmif_get(tpmif);
+				return tpmif;
+			} else {
+				return ERR_PTR(-EEXIST);
+			}
+		}
+	}
+
+	return alloc_tpmif(domid, bi);
+}
+
+static int map_frontend_page(tpmif_t *tpmif, unsigned long shared_page)
+{
+	int ret;
+	struct gnttab_map_grant_ref op;
+
+	gnttab_set_map_op(&op, (unsigned long)tpmif->tx_area->addr,
+			  GNTMAP_host_map, shared_page, tpmif->domid);
+
+	lock_vm_area(tpmif->tx_area);
+	ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, &op, 1);
+	unlock_vm_area(tpmif->tx_area);
+	BUG_ON(ret);
+
+	if (op.status) {
+		DPRINTK(" Grant table operation failure !\n");
+		return op.status;
+	}
+
+	tpmif->shmem_ref = shared_page;
+	tpmif->shmem_handle = op.handle;
+
+	return 0;
+}
+
+static void unmap_frontend_page(tpmif_t *tpmif)
+{
+	struct gnttab_unmap_grant_ref op;
+	int ret;
+
+	gnttab_set_unmap_op(&op, (unsigned long)tpmif->tx_area->addr,
+			    GNTMAP_host_map, tpmif->shmem_handle);
+
+	lock_vm_area(tpmif->tx_area);
+	ret = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, &op, 1);
+	unlock_vm_area(tpmif->tx_area);
+	BUG_ON(ret);
+}
+
+int tpmif_map(tpmif_t *tpmif, unsigned long shared_page, unsigned int evtchn)
+{
+	int err;
+	struct evtchn_bind_interdomain bind_interdomain;
+
+	if (tpmif->irq) {
+		return 0;
+	}
+
+	if ((tpmif->tx_area = alloc_vm_area(PAGE_SIZE)) == NULL)
+		return -ENOMEM;
+
+	err = map_frontend_page(tpmif, shared_page);
+	if (err) {
+		free_vm_area(tpmif->tx_area);
+		return err;
+	}
+
+
+	bind_interdomain.remote_dom  = tpmif->domid;
+	bind_interdomain.remote_port = evtchn;
+
+	err = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
+					  &bind_interdomain);
+	if (err) {
+		unmap_frontend_page(tpmif);
+		free_vm_area(tpmif->tx_area);
+		return err;
+	}
+
+	tpmif->evtchn = bind_interdomain.local_port;
+
+	tpmif->tx = (tpmif_tx_interface_t *)tpmif->tx_area->addr;
+
+	tpmif->irq = bind_evtchn_to_irqhandler(
+		tpmif->evtchn, tpmif_be_int, 0, tpmif->devname, tpmif);
+	tpmif->shmem_ref = shared_page;
+	tpmif->active = 1;
+
+	return 0;
+}
+
+void tpmif_disconnect_complete(tpmif_t *tpmif)
+{
+	if (tpmif->irq)
+		unbind_from_irqhandler(tpmif->irq, tpmif);
+
+	if (tpmif->tx) {
+		unmap_frontend_page(tpmif);
+		free_vm_area(tpmif->tx_area);
+	}
+
+	free_tpmif(tpmif);
+}
+
+void __init tpmif_interface_init(void)
+{
+	tpmif_cachep = kmem_cache_create("tpmif_cache", sizeof (tpmif_t),
+					 0, 0, NULL, NULL);
+}
+
+void __exit tpmif_interface_exit(void)
+{
+	kmem_cache_destroy(tpmif_cachep);
+}