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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.

Change-Id: Ic04659686e72838a0db518e9303dd037191e3879
Cc: Fernando Guzman Lugo <fernando.lugo@ti.com>
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
[ohaugan@codeaurora.org: Resolved compilation and merge issues]
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>

Conflicts:
	drivers/video/msm/mdss/mdss_mdp.c
This commit is contained in:
Ohad Ben-Cohen 2012-05-21 20:20:05 +03:00 committed by Iliyan Malchev
parent e182f58a32
commit 6c0572bb9b
4 changed files with 14 additions and 9 deletions
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4
drivers/gpu/msm/kgsl_iommu.c
View file

@ -282,7 +282,7 @@ static void _check_if_freed(struct kgsl_iommu_device *iommu_dev,
}
static int kgsl_iommu_fault_handler(struct iommu_domain *domain,
struct device *dev, unsigned long addr, int flags)
struct device *dev, unsigned long addr, int flags, void *token)
{
int ret = 0;
struct kgsl_mmu *mmu;
@ -622,7 +622,7 @@ void *kgsl_iommu_create_pagetable(void)
return NULL;
} else {
iommu_set_fault_handler(iommu_pt->domain,
kgsl_iommu_fault_handler);
kgsl_iommu_fault_handler, NULL);
}
return iommu_pt;

5
drivers/iommu/iommu.c
View file

@ -120,6 +120,7 @@ EXPORT_SYMBOL_GPL(iommu_present);
* iommu_set_fault_handler() - set a fault handler for an iommu domain
* @domain: iommu domain
* @handler: fault handler
* @token: user data, will be passed back to the fault handler
*
* This function should be used by IOMMU users which want to be notified
* whenever an IOMMU fault happens.
@ -128,11 +129,13 @@ EXPORT_SYMBOL_GPL(iommu_present);
* error code otherwise.
*/
void iommu_set_fault_handler(struct iommu_domain *domain,
iommu_fault_handler_t handler)
iommu_fault_handler_t handler,
void *token)
{
BUG_ON(!domain);
domain->handler = handler;
domain->handler_token = token;
}
EXPORT_SYMBOL_GPL(iommu_set_fault_handler);

4
drivers/remoteproc/remoteproc_core.c
View file

@ -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) {

10
include/linux/iommu.h
View file

@ -37,12 +37,13 @@ struct iommu_domain;
#define IOMMU_FAULT_WRITE 0x1
typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
struct device *, unsigned long, int);
struct device *, unsigned long, int, void *);
struct iommu_domain {
struct iommu_ops *ops;
void *priv;
iommu_fault_handler_t handler;
void *handler_token;
};
#define IOMMU_CAP_CACHE_COHERENCY 0x1
@ -107,7 +108,7 @@ extern int iommu_domain_has_cap(struct iommu_domain *domain,
unsigned long cap);
extern phys_addr_t iommu_get_pt_base_addr(struct iommu_domain *domain);
extern void iommu_set_fault_handler(struct iommu_domain *domain,
iommu_fault_handler_t handler);
iommu_fault_handler_t handler, void *token);
extern int iommu_device_group(struct device *dev, unsigned int *groupid);
/**
@ -144,7 +145,8 @@ static inline int report_iommu_fault(struct iommu_domain *domain,
* invoke it.
*/
if (domain->handler)
ret = domain->handler(domain, dev, iova, flags);
ret = domain->handler(domain, dev, iova, flags,
domain->handler_token);
return ret;
}
@ -221,7 +223,7 @@ static inline phys_addr_t iommu_get_pt_base_addr(struct iommu_domain *domain)
}
static inline void iommu_set_fault_handler(struct iommu_domain *domain,
iommu_fault_handler_t handler)
iommu_fault_handler_t handler, void *token)
{
}