diff options
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm_ibmvtpm.c | 81 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_ibmvtpm.h | 5 |
2 files changed, 30 insertions, 56 deletions
diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c index efc4ab36a9d..88a95ea2ba0 100644 --- a/drivers/char/tpm/tpm_ibmvtpm.c +++ b/drivers/char/tpm/tpm_ibmvtpm.c @@ -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; + + len = ibmvtpm->res_len; - if (count < ibmvtpm->crq_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)); diff --git a/drivers/char/tpm/tpm_ibmvtpm.h b/drivers/char/tpm/tpm_ibmvtpm.h index 4296eb4b4d8..bd82a791f99 100644 --- a/drivers/char/tpm/tpm_ibmvtpm.h +++ b/drivers/char/tpm/tpm_ibmvtpm.h @@ -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; }; |