msm: kgsl: Synchronize access to IOMMU cfg port
Add a software based spinlock between CPU and GPU.
This spinlock is used to grant mutually exclusive access to
SMMU configuration between CPU and GPU. This mutual exclusion
is required to prevent deadlock in the system.
CRs-Fixed: 409198
Change-Id: Ic375beaaf4c5505b41d3fabc4adf15965d71b13a
Signed-off-by: Tarun Karra <tkarra@codeaurora.org>
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rajeev Kulkarnie <krajeev@codeaurora.org>
diff --git a/drivers/gpu/msm/kgsl_mmu.h b/drivers/gpu/msm/kgsl_mmu.h
index b8b9149..0865978 100644
--- a/drivers/gpu/msm/kgsl_mmu.h
+++ b/drivers/gpu/msm/kgsl_mmu.h
@@ -148,6 +148,12 @@
unsigned int (*mmu_get_pt_base_addr)
(struct kgsl_mmu *mmu,
struct kgsl_pagetable *pt);
+ unsigned int (*mmu_sync_lock)
+ (struct kgsl_mmu *mmu,
+ unsigned int *cmds);
+ unsigned int (*mmu_sync_unlock)
+ (struct kgsl_mmu *mmu,
+ unsigned int *cmds);
};
struct kgsl_mmu_pt_ops {
@@ -162,6 +168,8 @@
void (*mmu_destroy_pagetable) (void *pt);
};
+#define KGSL_MMU_FLAGS_IOMMU_SYNC BIT(31)
+
struct kgsl_mmu {
unsigned int refcnt;
uint32_t flags;
@@ -321,4 +329,24 @@
return 0;
}
+static inline int kgsl_mmu_sync_lock(struct kgsl_mmu *mmu,
+ unsigned int *cmds)
+{
+ if ((mmu->flags & KGSL_MMU_FLAGS_IOMMU_SYNC) &&
+ mmu->mmu_ops && mmu->mmu_ops->mmu_sync_lock)
+ return mmu->mmu_ops->mmu_sync_lock(mmu, cmds);
+ else
+ return 0;
+}
+
+static inline int kgsl_mmu_sync_unlock(struct kgsl_mmu *mmu,
+ unsigned int *cmds)
+{
+ if ((mmu->flags & KGSL_MMU_FLAGS_IOMMU_SYNC) &&
+ mmu->mmu_ops && mmu->mmu_ops->mmu_sync_unlock)
+ return mmu->mmu_ops->mmu_sync_unlock(mmu, cmds);
+ else
+ return 0;
+}
+
#endif /* __KGSL_MMU_H */