static int omap_dmm_release(struct inode *inode, struct file *filp)
{
int status = 0;
struct iodmm_struct *obj;
if (!filp->private_data) {
status = -EIO;
goto err_out;
}
obj = filp->private_data;
flush_signals(current);
status = mutex_lock_interruptible(&obj->iovmm->dmm_map_lock);
if (status == 0) {
/*
* Report to remote Processor of the cleanup of these
* resources before cleaning in order to avoid MMU fault
* type of behavior
*/
if (!list_empty(&obj->map_list)) {
iommu_notify_event(obj->iovmm->iommu, IOMMU_CLOSE,
NULL);
}
mutex_unlock(&obj->iovmm->dmm_map_lock);
} else {
pr_err("%s mutex_lock_interruptible returned 0x%x\n",
__func__, status);
}
user_remove_resources(obj);
iommu_put(obj->iovmm->iommu);
/* Delete all the DMM pools after the reference count goes to zero */
if (--obj->iovmm->refcount == 0)
omap_delete_dmm_pools(obj);
kfree(obj);
filp->private_data = NULL;
err_out:
return status;
}
/*
* Device IOMMU generic operations
*/
static irqreturn_t iommu_fault_handler(int irq, void *data)
{
u32 stat, da;
u32 *iopgd, *iopte;
int err = -EIO;
struct iommu *obj = data;
if (!obj->refcount)
return IRQ_NONE;
eventfd_notification(obj);
/* Dynamic loading TLB or PTE */
err = iommu_notify_event(obj, IOMMU_FAULT, data);
if (err == NOTIFY_OK)
return IRQ_HANDLED;
if (!cpu_is_omap44xx())
clk_enable(obj->clk);
stat = iommu_report_fault(obj, &da);
if (!cpu_is_omap44xx())
clk_disable(obj->clk);
if (!stat)
return IRQ_HANDLED;
iopgd = iopgd_offset(obj, da);
if (!(*iopgd & IOPGD_TABLE)) {
dev_err(obj->dev, "%s: da:%08x pgd:%p *pgd:%08x\n", __func__,
da, iopgd, *iopgd);
return IRQ_NONE;
}
iopte = iopte_offset(iopgd, da);
dev_err(obj->dev, "%s: da:%08x pgd:%p *pgd:%08x pte:%p *pte:%08x\n",
__func__, da, iopgd, *iopgd, iopte, *iopte);
return IRQ_NONE;
}