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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Clean up the TPM stack a bit.
# HG changeset patch
# User cl349@xxxxxxxxxxxxxxxxxxxx
# Node ID e9d78d8bd568d4be0461bb5b09007fd2ccc4a707
# Parent aefd8b8c6b1fc3242e6a231a4461c12780d0c254
Clean up the TPM stack a bit.
Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxx>
diff -r aefd8b8c6b1f -r e9d78d8bd568 linux-2.6-xen-sparse/drivers/char/tpm/tpm.c
--- a/linux-2.6-xen-sparse/drivers/char/tpm/tpm.c Tue Feb 7 18:16:11 2006
+++ b/linux-2.6-xen-sparse/drivers/char/tpm/tpm.c Tue Feb 7 20:38:44 2006
@@ -67,9 +67,6 @@
u32 count;
unsigned long stop;
- if (!chip)
- return -ENODEV;
-
count = be32_to_cpu(*((__be32 *) (buf + 2)));
if (count == 0)
diff -r aefd8b8c6b1f -r e9d78d8bd568
linux-2.6-xen-sparse/drivers/char/tpm/tpm_xen.c
--- a/linux-2.6-xen-sparse/drivers/char/tpm/tpm_xen.c Tue Feb 7 18:16:11 2006
+++ b/linux-2.6-xen-sparse/drivers/char/tpm/tpm_xen.c Tue Feb 7 20:38:44 2006
@@ -42,7 +42,6 @@
unsigned int request_len;
unsigned char *rcv_buffer;
unsigned int buffersize;
- struct tpm_chip *chip;
unsigned int flags;
};
@@ -74,6 +73,8 @@
static struct data_exchange dataex;
static unsigned long disconnect_time;
+
+static struct tpmfe_device tpmfe;
/* local function prototypes */
static void __exit cleanup_xen(void);
@@ -119,7 +120,7 @@
static int tpm_recv(const u8 *buffer, size_t count, const void *ptr)
{
int ret_size = 0;
- struct transmission *t, *temp;
+ struct transmission *t;
/*
* The list with requests must contain one request
@@ -127,8 +128,9 @@
* was passed to me from the front-end.
*/
if (dataex.current_request != ptr) {
- printk("WARNING: The request pointer is different than the
pointer "
- "the shared memory driver returned to me. %p != %p\n",
+ printk("WARNING: The request pointer is different than the "
+ "pointer the shared memory driver returned to me. "
+ "%p != %p\n",
dataex.current_request, ptr);
}
@@ -144,16 +146,16 @@
return 0;
}
- if (NULL != (temp = dataex.current_request)) {
- transmission_free(temp);
+ if (NULL != (t = dataex.current_request)) {
+ transmission_free(t);
dataex.current_request = NULL;
}
t = transmission_alloc();
- if (NULL != t) {
+ if (t) {
unsigned long flags;
t->rcv_buffer = kmalloc(count, GFP_KERNEL);
- if (NULL == t->rcv_buffer) {
+ if (! t->rcv_buffer) {
transmission_free(t);
return -ENOMEM;
}
@@ -258,10 +260,6 @@
if (t != NULL) {
unsigned int error = 0;
- t->rcv_buffer = NULL;
- t->buffersize = 0;
- t->chip = chip;
-
/*
* Queue the packet if the driver below is not
* ready, yet, or there is any packet already
@@ -304,9 +302,11 @@
struct transmission *qt = (struct transmission
*) dataex.queued_requests.next;
list_del(&qt->next);
dataex.current_request = qt;
- spin_unlock_irqrestore(&dataex.req_list_lock,
flags);
-
- rc = tpm_fe_send(qt->request,
+ spin_unlock_irqrestore(&dataex.req_list_lock,
+ flags);
+
+ rc = tpm_fe_send(tpmfe.tpm_private,
+ qt->request,
qt->request_len,
qt);
@@ -351,7 +351,8 @@
* amount of bytes in the request and
* a void * pointer (here: transmission
structure)
*/
- rc = tpm_fe_send(buf, count, t);
+ rc = tpm_fe_send(tpmfe.tpm_private,
+ buf, count, t);
/*
* The generic TPM driver will call
* the function to receive the response.
@@ -373,7 +374,8 @@
* queue it.
*/
dataex.flags |= DATAEX_FLAG_QUEUED_ONLY;
- list_add_tail(&t->next,
&dataex.queued_requests);
+ list_add_tail(&t->next,
+ &dataex.queued_requests);
rc = 0;
}
}
@@ -512,7 +514,7 @@
tpm_fe_unregister_receiver();
}
-fs_initcall(init_xen);
+module_init(init_xen);
module_exit(cleanup_xen);
MODULE_AUTHOR("Stefan Berger (stefanb@xxxxxxxxxx)");
diff -r aefd8b8c6b1f -r e9d78d8bd568
linux-2.6-xen-sparse/drivers/xen/tpmfront/tpmfront.c
--- a/linux-2.6-xen-sparse/drivers/xen/tpmfront/tpmfront.c Tue Feb 7
18:16:11 2006
+++ b/linux-2.6-xen-sparse/drivers/xen/tpmfront/tpmfront.c Tue Feb 7
20:38:44 2006
@@ -56,14 +56,14 @@
/* locally visible variables */
static grant_ref_t gref_head;
-static struct tpm_private my_private;
+static struct tpm_private *my_priv;
/* local function prototypes */
static irqreturn_t tpmif_int(int irq,
void *tpm_priv,
struct pt_regs *ptregs);
static void tpmif_rx_action(unsigned long unused);
-static void tpmif_connect(u16 evtchn, domid_t domid);
+static void tpmif_connect(struct tpm_private *tp, domid_t domid);
static DECLARE_TASKLET(tpmif_rx_tasklet, tpmif_rx_action, 0);
static int tpm_allocate_buffers(struct tpm_private *tp);
static void tpmif_set_connected_state(struct tpm_private *tp,
@@ -101,7 +101,7 @@
static inline struct tx_buffer *tx_buffer_alloc(void)
{
- struct tx_buffer *txb = kmalloc(sizeof (struct tx_buffer),
+ struct tx_buffer *txb = kzalloc(sizeof (struct tx_buffer),
GFP_KERNEL);
if (txb) {
@@ -118,6 +118,31 @@
/**************************************************************
+ Utility function for the tpm_private structure
+**************************************************************/
+static inline void tpm_private_init(struct tpm_private *tp)
+{
+ spin_lock_init(&tp->tx_lock);
+ init_waitqueue_head(&tp->wait_q);
+}
+
+static struct tpm_private *tpm_private_get(void)
+{
+ if (!my_priv) {
+ my_priv = kzalloc(sizeof(struct tpm_private), GFP_KERNEL);
+ if (my_priv) {
+ tpm_private_init(my_priv);
+ }
+ }
+ return my_priv;
+}
+
+static inline void tpm_private_free(struct tpm_private *tp)
+{
+ kfree(tp);
+}
+
+/**************************************************************
The interface to let the tpm plugin register its callback
function and send data to another partition using this module
@@ -131,10 +156,9 @@
/*
* Send data via this module by calling this function
*/
-int tpm_fe_send(const u8 * buf, size_t count, void *ptr)
+int tpm_fe_send(struct tpm_private *tp, const u8 * buf, size_t count, void
*ptr)
{
int sent = 0;
- struct tpm_private *tp = &my_private;
down(&suspend_lock);
sent = tpm_xmit(tp, buf, count, 0, ptr);
@@ -155,6 +179,7 @@
if (NULL == upperlayer_tpmfe) {
upperlayer_tpmfe = tpmfe_dev;
tpmfe_dev->max_tx_size = TPMIF_TX_RING_SIZE * PAGE_SIZE;
+ tpmfe_dev->tpm_private = tpm_private_get();
} else {
rc = -EBUSY;
}
@@ -197,10 +222,9 @@
**************************************************************/
static int setup_tpmring(struct xenbus_device *dev,
- struct tpmfront_info * info)
+ struct tpm_private *tp)
{
tpmif_tx_interface_t *sring;
- struct tpm_private *tp = &my_private;
int err;
sring = (void *)__get_free_page(GFP_KERNEL);
@@ -219,13 +243,13 @@
xenbus_dev_fatal(dev, err, "allocating grant reference");
goto fail;
}
- info->ring_ref = err;
+ tp->ring_ref = err;
err = xenbus_alloc_evtchn(dev, &tp->evtchn);
if (err)
goto fail;
- tpmif_connect(tp->evtchn, dev->otherend_id);
+ tpmif_connect(tp, dev->otherend_id);
return 0;
fail:
@@ -233,11 +257,11 @@
}
-static void destroy_tpmring(struct tpmfront_info *info, struct tpm_private *tp)
+static void destroy_tpmring(struct tpm_private *tp)
{
tpmif_set_connected_state(tp, 0);
if (tp->tx != NULL) {
- gnttab_end_foreign_access(info->ring_ref, 0,
+ gnttab_end_foreign_access(tp->ring_ref, 0,
(unsigned long)tp->tx);
tp->tx = NULL;
}
@@ -249,13 +273,13 @@
static int talk_to_backend(struct xenbus_device *dev,
- struct tpmfront_info *info)
+ struct tpm_private *tp)
{
const char *message = NULL;
int err;
xenbus_transaction_t xbt;
- err = setup_tpmring(dev, info);
+ err = setup_tpmring(dev, tp);
if (err) {
xenbus_dev_fatal(dev, err, "setting up ring");
goto out;
@@ -269,14 +293,14 @@
}
err = xenbus_printf(xbt, dev->nodename,
- "ring-ref","%u", info->ring_ref);
+ "ring-ref","%u", tp->ring_ref);
if (err) {
message = "writing ring-ref";
goto abort_transaction;
}
err = xenbus_printf(xbt, dev->nodename,
- "event-channel", "%u", my_private.evtchn);
+ "event-channel", "%u", tp->evtchn);
if (err) {
message = "writing event-channel";
goto abort_transaction;
@@ -301,7 +325,7 @@
if (message)
xenbus_dev_error(dev, err, "%s", message);
destroy_tpmring:
- destroy_tpmring(info, &my_private);
+ destroy_tpmring(tp);
out:
return err;
}
@@ -312,7 +336,7 @@
static void backend_changed(struct xenbus_device *dev,
XenbusState backend_state)
{
- struct tpm_private *tp = &my_private;
+ struct tpm_private *tp = dev->data;
DPRINTK("\n");
switch (backend_state) {
@@ -343,8 +367,8 @@
const struct xenbus_device_id *id)
{
int err;
- struct tpmfront_info *info;
int handle;
+ struct tpm_private *tp = tpm_private_get();
err = xenbus_scanf(XBT_NULL, dev->nodename,
"handle", "%i", &handle);
@@ -356,20 +380,12 @@
return err;
}
- info = kmalloc(sizeof(*info), GFP_KERNEL);
- if (!info) {
- err = -ENOMEM;
- xenbus_dev_fatal(dev,err,"allocating info structure");
- return err;
- }
- memset(info, 0x0, sizeof(*info));
-
- info->dev = dev;
- dev->data = info;
-
- err = talk_to_backend(dev, info);
+ tp->dev = dev;
+ dev->data = tp;
+
+ err = talk_to_backend(dev, tp);
if (err) {
- kfree(info);
+ tpm_private_free(tp);
dev->data = NULL;
return err;
}
@@ -379,18 +395,15 @@
static int tpmfront_remove(struct xenbus_device *dev)
{
- struct tpmfront_info *info = dev->data;
-
- destroy_tpmring(info, &my_private);
-
- kfree(info);
+ struct tpm_private *tp = dev->data;
+ destroy_tpmring(tp);
return 0;
}
static int
tpmfront_suspend(struct xenbus_device *dev)
{
- struct tpm_private *tp = &my_private;
+ struct tpm_private *tp = dev->data;
u32 ctr;
/* lock, so no app can send */
@@ -420,17 +433,15 @@
static int
tpmfront_resume(struct xenbus_device *dev)
{
- struct tpmfront_info *info = dev->data;
- return talk_to_backend(dev, info);
+ struct tpm_private *tp = dev->data;
+ return talk_to_backend(dev, tp);
}
static void
-tpmif_connect(u16 evtchn, domid_t domid)
+tpmif_connect(struct tpm_private *tp, domid_t domid)
{
int err;
- struct tpm_private *tp = &my_private;
-
- tp->evtchn = evtchn;
+
tp->backend_id = domid;
err = bind_evtchn_to_irqhandler(tp->evtchn,
@@ -477,9 +488,9 @@
}
static void
-tpmif_rx_action(unsigned long unused)
-{
- struct tpm_private *tp = &my_private;
+tpmif_rx_action(unsigned long priv)
+{
+ struct tpm_private *tp = (struct tpm_private *)priv;
int i = 0;
unsigned int received;
@@ -529,6 +540,7 @@
unsigned long flags;
spin_lock_irqsave(&tp->tx_lock, flags);
+ tpmif_rx_tasklet.data = (unsigned long)tp;
tasklet_schedule(&tpmif_rx_tasklet);
spin_unlock_irqrestore(&tp->tx_lock, flags);
@@ -678,12 +690,6 @@
&gref_head ) < 0) {
return -EFAULT;
}
- /*
- * Only don't send the driver status when we are in the
- * INIT domain.
- */
- spin_lock_init(&my_private.tx_lock);
- init_waitqueue_head(&my_private.wait_q);
init_tpm_xenbus();
diff -r aefd8b8c6b1f -r e9d78d8bd568
linux-2.6-xen-sparse/drivers/xen/tpmfront/tpmfront.h
--- a/linux-2.6-xen-sparse/drivers/xen/tpmfront/tpmfront.h Tue Feb 7
18:16:11 2006
+++ b/linux-2.6-xen-sparse/drivers/xen/tpmfront/tpmfront.h Tue Feb 7
20:38:44 2006
@@ -17,9 +17,6 @@
domid_t backend_id;
wait_queue_head_t wait_q;
-};
-
-struct tpmfront_info {
struct xenbus_device *dev;
int ring_ref;
};
diff -r aefd8b8c6b1f -r e9d78d8bd568 linux-2.6-xen-sparse/include/xen/tpmfe.h
--- a/linux-2.6-xen-sparse/include/xen/tpmfe.h Tue Feb 7 18:16:11 2006
+++ b/linux-2.6-xen-sparse/include/xen/tpmfe.h Tue Feb 7 20:38:44 2006
@@ -1,5 +1,7 @@
#ifndef TPM_FE_H
#define TPM_FE_H
+
+struct tpm_private;
struct tpmfe_device {
/*
@@ -19,6 +21,11 @@
* for allocation of buffers.
*/
unsigned int max_tx_size;
+ /*
+ * The following is a private structure of the underlying
+ * driver. It's expected as first parameter in the send function.
+ */
+ struct tpm_private *tpm_private;
};
enum {
@@ -26,7 +33,7 @@
TPMFE_STATUS_CONNECTED = 0x1
};
-int tpm_fe_send(const u8 * buf, size_t count, void *ptr);
+int tpm_fe_send(struct tpm_private * tp, const u8 * buf, size_t count, void
*ptr);
int tpm_fe_register_receiver(struct tpmfe_device *);
void tpm_fe_unregister_receiver(void);
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