/*
* Closes the specified connection.
*
* Upon return, the connection has been destroyed and cannot be used anymore.
*
* This function does nothing if connection is set to NULL.
*/
void tf_close(struct tf_connection *connection)
{
int error;
enum TF_CONN_STATE state;
dprintk(KERN_DEBUG "tf_close(%p)\n", connection);
if (connection == NULL)
return;
/*
* Assumption: Linux guarantees that no other operation is in progress
* and that no other operation will be started when close is called
*/
BUG_ON(atomic_read(&(connection->pending_op_count)) != 0);
/*
* Exchange a Destroy Device Context message if needed.
*/
spin_lock(&(connection->state_lock));
state = connection->state;
spin_unlock(&(connection->state_lock));
if (state == TF_CONN_STATE_VALID_DEVICE_CONTEXT) {
/*
* A DestroyDeviceContext operation was not performed. Do it
* now.
*/
error = tf_destroy_device_context(connection);
if (error != 0)
/* avoid cleanup if destroy device context fails */
goto error;
}
/*
* Clean up the shared memory
*/
tf_cleanup_shared_memories(connection);
#ifdef CONFIG_TF_ION
if (connection->ion_client != NULL)
ion_client_destroy(connection->ion_client);
#endif
spin_lock(&(connection->dev->connection_list_lock));
list_del(&(connection->list));
spin_unlock(&(connection->dev->connection_list_lock));
internal_kfree(connection);
return;
error:
dprintk(KERN_DEBUG "tf_close(%p) failed with error code %d\n",
connection, error);
}
/**
* Unmaps a shared memory
**/
static void SCXLNXConnUnmapShmem(
struct SCXLNX_CONNECTION *pConn,
struct SCXLNX_SHMEM_DESC *pShmemDesc,
u32 nFullCleanup)
{
/* check pShmemDesc contains a descriptor */
if (pShmemDesc == NULL)
return;
dprintk(KERN_DEBUG "SCXLNXConnUnmapShmem(%p)\n", pShmemDesc);
retry:
mutex_lock(&(pConn->sharedMemoriesMutex));
if (atomic_read(&pShmemDesc->nRefCnt) > 1) {
/*
* Shared mem still in use, wait for other operations completion
* before actually unmapping it.
*/
dprintk(KERN_INFO "Descriptor in use\n");
mutex_unlock(&(pConn->sharedMemoriesMutex));
schedule();
goto retry;
}
SCXLNXCommReleaseSharedMemory(
&(pConn->sAllocationContext),
pShmemDesc,
nFullCleanup);
list_del(&(pShmemDesc->list));
if ((pShmemDesc->nType == SCXLNX_SHMEM_TYPE_REGISTERED_SHMEM) ||
(nFullCleanup != 0)) {
internal_kfree(pShmemDesc);
atomic_dec(&(pConn->nShmemAllocated));
} else {
/*
* This is a preallocated shared memory, add to free list
* Since the device context is unmapped last, it is
* always the first element of the free list if no
* device context has been created
*/
pShmemDesc->hIdentifier = 0;
list_add(&(pShmemDesc->list), &(pConn->sFreeSharedMemoryList));
}
mutex_unlock(&(pConn->sharedMemoriesMutex));
}
/**
* Unmaps a shared memory
**/
void tf_unmap_shmem(
struct tf_connection *connection,
struct tf_shmem_desc *shmem_desc,
u32 full_cleanup)
{
/* check shmem_desc contains a descriptor */
if (shmem_desc == NULL)
return;
dprintk(KERN_DEBUG "tf_unmap_shmem(%p)\n", shmem_desc);
retry:
mutex_lock(&(connection->shmem_mutex));
if (atomic_read(&shmem_desc->ref_count) > 1) {
/*
* Shared mem still in use, wait for other operations completion
* before actually unmapping it.
*/
dprintk(KERN_INFO "Descriptor in use\n");
mutex_unlock(&(connection->shmem_mutex));
schedule();
goto retry;
}
tf_cleanup_shared_memory(
&(connection->cpt_alloc_context),
shmem_desc,
full_cleanup);
list_del(&(shmem_desc->list));
if ((shmem_desc->type == TF_SHMEM_TYPE_REGISTERED_SHMEM) ||
(full_cleanup != 0)) {
internal_kfree(shmem_desc);
atomic_dec(&(connection->shmem_count));
} else {
/*
* This is a preallocated shared memory, add to free list
* Since the device context is unmapped last, it is
* always the first element of the free list if no
* device context has been created
*/
shmem_desc->block_identifier = 0;
list_add(&(shmem_desc->list), &(connection->free_shmem_list));
}
mutex_unlock(&(connection->shmem_mutex));
}
/*
* Closes the specified connection.
*
* Upon return, the connection referenced by pConn has been destroyed and cannot
* be used anymore.
*
* This function does nothing if pConn is set to NULL.
*/
void SCXLNXConnClose(struct SCXLNX_CONNECTION *pConn)
{
int nError;
enum SCXLNX_CONN_STATE nState;
dprintk(KERN_DEBUG "SCXLNXConnClose(%p)\n", pConn);
if (pConn == NULL)
return;
/*
* Assumption: Linux guarantees that no other operation is in progress
* and that no other operation will be started when close is called
*/
BUG_ON(atomic_read(&(pConn->nPendingOpCounter)) != 0);
/*
* Exchange a Destroy Device Context message if needed.
*/
spin_lock(&(pConn->stateLock));
nState = pConn->nState;
spin_unlock(&(pConn->stateLock));
if (nState == SCXLNX_CONN_STATE_VALID_DEVICE_CONTEXT) {
/*
* A DestroyDeviceContext operation was not performed. Do it
* now.
*/
nError = SCXLNXConnDestroyDeviceContext(pConn);
if (nError != 0)
/* avoid cleanup if destroy device context fails */
goto error;
}
/*
* Clean up the shared memory
*/
SCXLNXConnCleanupSharedMemory(pConn);
internal_kfree(pConn);
return;
error:
dprintk(KERN_DEBUG "SCXLNXConnClose(%p) failed with error code %d\n",
pConn, nError);
}
/**
*Unmaps a shared memory descriptor
**/
static void SCXLNXConnUnmapShmem(SCXLNX_SHMEM_MONITOR *pShmemMonitor,
SCXLNX_SHMEM_DESC *pShmemDesc,
u32 nFullCleanup)
{
/*check pShmemDesc contains a descriptor */
if (pShmemDesc == NULL)
return;
dprintk(KERN_INFO "SCXLNXConnUnmapShmem(%p) : \
descriptor %p, refcnt=%d\n", pShmemMonitor,
pShmemDesc, atomic_read(&(pShmemDesc->nRefCnt)));
wait_for_unused:
down(&(pShmemMonitor->sharedMemoriesMutex));
if (atomic_read(&(pShmemDesc->nRefCnt)) > 1) {
dprintk(KERN_INFO "Descriptor in use\n");
up(&(pShmemMonitor->sharedMemoriesMutex));
schedule();
goto wait_for_unused;
}
SCXLNXSMCommReleaseDescriptor(pShmemDesc, 1);
list_del(&(pShmemDesc->list));
if ((pShmemDesc->nType == SCXLNX_SHMEM_TYPE_REGISTERED_SHMEM)
|| (nFullCleanup != 0)) {
/*free descriptor */
internal_kfree(pShmemDesc);
atomic_dec(&(pShmemMonitor->nShmemAllocated));
} else {
/*
*This is a preallocated descriptor, add to free list
*Since the device context is unmapped last, it is
*always the first element of the free list if no
*device context has been created
*/
pShmemDesc->hIdentifier = 0;
list_add(&(pShmemDesc->list),
&(pShmemMonitor->sFreeSharedMemoryList));
}
up(&(pShmemMonitor->sharedMemoriesMutex));
}
/*
* Opens a connection to the specified device.
*
* The placeholder referenced by ppConn is set to the address of the
* new connection; it is set to NULL upon failure.
*
* Returns zero upon successful completion, or an appropriate error code upon
* failure.
*/
int SCXLNXConnOpen(struct SCXLNX_DEVICE *pDevice,
struct file *file,
struct SCXLNX_CONNECTION **ppConn)
{
int nError;
struct SCXLNX_CONNECTION *pConn = NULL;
dprintk(KERN_INFO "SCXLNXConnOpen(%p, %p)\n", file, ppConn);
/*
* Allocate and initialize the connection.
* kmalloc only allocates sizeof(*pConn) virtual memory
*/
pConn = (struct SCXLNX_CONNECTION *) internal_kmalloc(sizeof(*pConn),
GFP_KERNEL);
if (pConn == NULL) {
printk(KERN_ERR "SCXLNXConnOpen(): "
"Out of memory for connection!\n");
nError = -ENOMEM;
goto error;
}
memset(pConn, 0, sizeof(*pConn));
INIT_LIST_HEAD(&(pConn->list));
pConn->nState = SCXLNX_CONN_STATE_NO_DEVICE_CONTEXT;
pConn->pDevice = pDevice;
spin_lock_init(&(pConn->stateLock));
atomic_set(&(pConn->nPendingOpCounter), 0);
/*
* Initialize the shared memory
*/
nError = SCXLNXConnInitSharedMemory(pConn);
if (nError != 0)
goto error;
#ifdef CONFIG_TF_MSHIELD
/*
* Initialize CUS specifics
*/
SCXPublicCryptoInitDeviceContext(pConn);
#endif
/*
* Successful completion.
*/
*ppConn = pConn;
dprintk(KERN_INFO "SCXLNXConnOpen(): Success (pConn=%p)\n", pConn);
return 0;
/*
* Error handling.
*/
error:
dprintk(KERN_ERR "SCXLNXConnOpen(): Failure (error %d)\n", nError);
/* Deallocate the descriptor pages if necessary */
internal_kfree(pConn);
*ppConn = NULL;
return nError;
}
/*
* Opens a connection to the specified device.
*
* The placeholder referenced by connection is set to the address of the
* new connection; it is set to NULL upon failure.
*
* Returns zero upon successful completion, or an appropriate error code upon
* failure.
*/
int tf_open(struct tf_device *dev,
struct file *file,
struct tf_connection **connection)
{
int error;
struct tf_connection *conn = NULL;
dprintk(KERN_INFO "tf_open(%p, %p)\n", file, connection);
/*
* Allocate and initialize the conn.
* kmalloc only allocates sizeof(*conn) virtual memory
*/
conn = (struct tf_connection *) internal_kmalloc(sizeof(*conn),
GFP_KERNEL);
if (conn == NULL) {
printk(KERN_ERR "tf_open(): "
"Out of memory for conn!\n");
error = -ENOMEM;
goto error;
}
memset(conn, 0, sizeof(*conn));
conn->state = TF_CONN_STATE_NO_DEVICE_CONTEXT;
conn->dev = dev;
spin_lock_init(&(conn->state_lock));
atomic_set(&(conn->pending_op_count), 0);
INIT_LIST_HEAD(&(conn->list));
/*
* Initialize the shared memory
*/
error = tf_init_shared_memory(conn);
if (error != 0)
goto error;
#ifdef CONFIG_TF_ZEBRA
/*
* Initialize CUS specifics
*/
tf_crypto_init_cus(conn);
#endif
/*
* Attach the conn to the device.
*/
spin_lock(&(dev->connection_list_lock));
list_add(&(conn->list), &(dev->connection_list));
spin_unlock(&(dev->connection_list_lock));
/*
* Successful completion.
*/
*connection = conn;
dprintk(KERN_INFO "tf_open(): Success (conn=%p)\n", conn);
return 0;
/*
* Error handling.
*/
error:
dprintk(KERN_ERR "tf_open(): Failure (error %d)\n", error);
/* Deallocate the descriptor pages if necessary */
internal_kfree(conn);
*connection = NULL;
return error;
}