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drivers/char/tpm: remove tasklet and cleanup

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This patch removed the tasklet and moved the wait queue into the
private structure.  It also cleaned up the response CRQ path.

Signed-off-by: Ashley Lai <adlai@us.ibm.com>
Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
This commit is contained in:
Ashley Lai 2012-09-12 12:49:50 -05:00 committed by Kent Yoder
parent 61d335dd27
commit b566650270
2 changed files with 30 additions and 56 deletions
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81
drivers/char/tpm/tpm_ibmvtpm.c
View File

@ -38,8 +38,6 @@ static struct vio_device_id tpm_ibmvtpm_device_table[] __devinitdata = {
};
MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table);
DECLARE_WAIT_QUEUE_HEAD(wq);
/**
* ibmvtpm_send_crq - Send a CRQ request
* @vdev: vio device struct
@ -83,6 +81,7 @@ static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count)
{
struct ibmvtpm_dev *ibmvtpm;
u16 len;
int sig;
ibmvtpm = (struct ibmvtpm_dev *)chip->vendor.data;
@ -91,22 +90,23 @@ static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count)
return 0;
}
wait_event_interruptible(wq, ibmvtpm->crq_res.len != 0);
sig = wait_event_interruptible(ibmvtpm->wq, ibmvtpm->res_len != 0);
if (sig)
return -EINTR;
if (count < ibmvtpm->crq_res.len) {
len = ibmvtpm->res_len;
if (count < len) {
dev_err(ibmvtpm->dev,
"Invalid size in recv: count=%ld, crq_size=%d\n",
count, ibmvtpm->crq_res.len);
count, len);
return -EIO;
}
spin_lock(&ibmvtpm->rtce_lock);
memcpy((void *)buf, (void *)ibmvtpm->rtce_buf, ibmvtpm->crq_res.len);
memset(ibmvtpm->rtce_buf, 0, ibmvtpm->crq_res.len);
ibmvtpm->crq_res.valid = 0;
ibmvtpm->crq_res.msg = 0;
len = ibmvtpm->crq_res.len;
ibmvtpm->crq_res.len = 0;
memcpy((void *)buf, (void *)ibmvtpm->rtce_buf, len);
memset(ibmvtpm->rtce_buf, 0, len);
ibmvtpm->res_len = 0;
spin_unlock(&ibmvtpm->rtce_lock);
return len;
}
@ -273,7 +273,6 @@ static int __devexit tpm_ibmvtpm_remove(struct vio_dev *vdev)
int rc = 0;
free_irq(vdev->irq, ibmvtpm);
tasklet_kill(&ibmvtpm->tasklet);
do {
if (rc)
@ -372,7 +371,6 @@ static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm)
static int tpm_ibmvtpm_resume(struct device *dev)
{
struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
unsigned long flags;
int rc = 0;
do {
@ -387,10 +385,11 @@ static int tpm_ibmvtpm_resume(struct device *dev)
return rc;
}
spin_lock_irqsave(&ibmvtpm->lock, flags);
vio_disable_interrupts(ibmvtpm->vdev);
tasklet_schedule(&ibmvtpm->tasklet);
spin_unlock_irqrestore(&ibmvtpm->lock, flags);
rc = vio_enable_interrupts(ibmvtpm->vdev);
if (rc) {
dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc);
return rc;
}
rc = ibmvtpm_crq_send_init(ibmvtpm);
if (rc)
@ -467,7 +466,7 @@ static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm)
if (crq->valid & VTPM_MSG_RES) {
if (++crq_q->index == crq_q->num_entry)
crq_q->index = 0;
rmb();
smp_rmb();
} else
crq = NULL;
return crq;
@ -535,11 +534,9 @@ static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
ibmvtpm->vtpm_version = crq->data;
return;
case VTPM_TPM_COMMAND_RES:
ibmvtpm->crq_res.valid = crq->valid;
ibmvtpm->crq_res.msg = crq->msg;
ibmvtpm->crq_res.len = crq->len;
ibmvtpm->crq_res.data = crq->data;
wake_up_interruptible(&wq);
/* len of the data in rtce buffer */
ibmvtpm->res_len = crq->len;
wake_up_interruptible(&ibmvtpm->wq);
return;
default:
return;
@ -559,38 +556,19 @@ static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance)
{
struct ibmvtpm_dev *ibmvtpm = (struct ibmvtpm_dev *) vtpm_instance;
unsigned long flags;
spin_lock_irqsave(&ibmvtpm->lock, flags);
vio_disable_interrupts(ibmvtpm->vdev);
tasklet_schedule(&ibmvtpm->tasklet);
spin_unlock_irqrestore(&ibmvtpm->lock, flags);
return IRQ_HANDLED;
}
/**
* ibmvtpm_tasklet - Interrupt handler tasklet
* @data: ibm vtpm device struct
*
* Returns:
* Nothing
**/
static void ibmvtpm_tasklet(void *data)
{
struct ibmvtpm_dev *ibmvtpm = data;
struct ibmvtpm_crq *crq;
unsigned long flags;
spin_lock_irqsave(&ibmvtpm->lock, flags);
/* while loop is needed for initial setup (get version and
* get rtce_size). There should be only one tpm request at any
* given time.
*/
while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) {
ibmvtpm_crq_process(crq, ibmvtpm);
crq->valid = 0;
wmb();
smp_wmb();
}
vio_enable_interrupts(ibmvtpm->vdev);
spin_unlock_irqrestore(&ibmvtpm->lock, flags);
return IRQ_HANDLED;
}
/**
@ -650,9 +628,6 @@ static int __devinit tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
goto reg_crq_cleanup;
}
tasklet_init(&ibmvtpm->tasklet, (void *)ibmvtpm_tasklet,
(unsigned long)ibmvtpm);
rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0,
tpm_ibmvtpm_driver_name, ibmvtpm);
if (rc) {
@ -666,13 +641,14 @@ static int __devinit tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
goto init_irq_cleanup;
}
init_waitqueue_head(&ibmvtpm->wq);
crq_q->index = 0;
ibmvtpm->dev = dev;
ibmvtpm->vdev = vio_dev;
chip->vendor.data = (void *)ibmvtpm;
spin_lock_init(&ibmvtpm->lock);
spin_lock_init(&ibmvtpm->rtce_lock);
rc = ibmvtpm_crq_send_init(ibmvtpm);
@ -689,7 +665,6 @@ static int __devinit tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
return rc;
init_irq_cleanup:
tasklet_kill(&ibmvtpm->tasklet);
do {
rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address);
} while (rc1 == H_BUSY || H_IS_LONG_BUSY(rc1));

5
drivers/char/tpm/tpm_ibmvtpm.h
View File

@ -38,13 +38,12 @@ struct ibmvtpm_dev {
struct vio_dev *vdev;
struct ibmvtpm_crq_queue crq_queue;
dma_addr_t crq_dma_handle;
spinlock_t lock;
struct tasklet_struct tasklet;
u32 rtce_size;
void __iomem *rtce_buf;
dma_addr_t rtce_dma_handle;
spinlock_t rtce_lock;
struct ibmvtpm_crq crq_res;
wait_queue_head_t wq;
u16 res_len;
u32 vtpm_version;
};