msm: iommu: Synchronize access to IOMMU cfg port
Add remote spinlock that allows CPU and GPU to
synchronize access to IOMMU hardware.
Add usage of remote spinlock to iommu driver and
add depenency on SFPB hardware mutex being enabled.`
This feature is not using SFPB hardware mutex. However,
SFPB hardware mutex must be enabled since the remote
spinlock implementation is making use of shared memory
that is normally used when SFPB hardware mutex is not enabled.
Change-Id: Idc622f3484062e0721493be3cbbfb8889ed9d800
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
diff --git a/arch/arm/mach-msm/include/mach/iommu.h b/arch/arm/mach-msm/include/mach/iommu.h
index 57b4bd3..ea3fb64 100644
--- a/arch/arm/mach-msm/include/mach/iommu.h
+++ b/arch/arm/mach-msm/include/mach/iommu.h
@@ -147,6 +147,59 @@
irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id);
irqreturn_t msm_iommu_fault_handler_v2(int irq, void *dev_id);
+enum {
+ PROC_APPS,
+ PROC_GPU,
+ PROC_MAX
+};
+
+/* Expose structure to allow kgsl iommu driver to use the same structure to
+ * communicate to GPU the addresses of the flag and turn variables.
+ */
+struct remote_iommu_petersons_spinlock {
+ uint32_t flag[PROC_MAX];
+ uint32_t turn;
+};
+
+#ifdef CONFIG_MSM_IOMMU
+void *msm_iommu_lock_initialize(void);
+void msm_iommu_mutex_lock(void);
+void msm_iommu_mutex_unlock(void);
+#else
+static inline void *msm_iommu_lock_initialize(void)
+{
+ return NULL;
+}
+static inline void msm_iommu_mutex_lock(void) { }
+static inline void msm_iommu_mutex_unlock(void) { }
+#endif
+
+#ifdef CONFIG_MSM_IOMMU_GPU_SYNC
+void msm_iommu_remote_p0_spin_lock(void);
+void msm_iommu_remote_p0_spin_unlock(void);
+
+#define msm_iommu_remote_lock_init() _msm_iommu_remote_spin_lock_init()
+#define msm_iommu_remote_spin_lock() msm_iommu_remote_p0_spin_lock()
+#define msm_iommu_remote_spin_unlock() msm_iommu_remote_p0_spin_unlock()
+#else
+#define msm_iommu_remote_lock_init()
+#define msm_iommu_remote_spin_lock()
+#define msm_iommu_remote_spin_unlock()
+#endif
+
+/* Allows kgsl iommu driver to acquire lock */
+#define msm_iommu_lock() \
+ do { \
+ msm_iommu_mutex_lock(); \
+ msm_iommu_remote_spin_lock(); \
+ } while (0)
+
+#define msm_iommu_unlock() \
+ do { \
+ msm_iommu_remote_spin_unlock(); \
+ msm_iommu_mutex_unlock(); \
+ } while (0)
+
#ifdef CONFIG_MSM_IOMMU
/*
* Look up an IOMMU context device by its context name. NULL if none found.