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iommu/core: pass a user-provided token to fault handlers

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Sometimes a single IOMMU user may have to deal with several
different IOMMU devices (e.g. remoteproc).

When an IOMMU fault happens, such users have to regain their
context in order to deal with the fault.

Users can't use the private fields of neither the iommu_domain nor
the IOMMU device, because those are already used by the IOMMU core
and low level driver (respectively).

This patch just simply allows users to pass a private token (most
notably their own context pointer) to iommu_set_fault_handler(),
and then makes sure it is provided back to the users whenever
an IOMMU fault happens.

The patch also adopts remoteproc to the new fault handling
interface, but the real functionality using this (recovery of
remote processors) will only be added later in a subsequent patch
set.

Cc: Fernando Guzman Lugo <[email protected]>
Signed-off-by: Ohad Ben-Cohen <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>
This commit is contained in:
Ohad Ben-Cohen 2012-05-21 20:20:05 +03:00 • committed by Joerg Roedel
commit 77ca233235
3 changed files with 12 additions and 7 deletions
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4
drivers/remoteproc/remoteproc_core.c
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@ -78,7 +78,7 @@ typedef int (*rproc_handle_resource_t)(struct rproc *rproc, void *, int avail);
* the recovery of the remote processor.
*/
static int rproc_iommu_fault(struct iommu_domain *domain, struct device *dev,
unsigned long iova, int flags)
unsigned long iova, int flags, void *token)
{
dev_err(dev, "iommu fault: da 0x%lx flags 0x%x\n", iova, flags);
@ -117,7 +117,7 @@ static int rproc_enable_iommu(struct rproc *rproc)
return -ENOMEM;
}
iommu_set_fault_handler(domain, rproc_iommu_fault);
iommu_set_fault_handler(domain, rproc_iommu_fault, rproc);
ret = iommu_attach_device(domain, dev);
if (ret) {