drm/amdkfd: Add CONFIG_HSA_AMD_SVM

Control whether to build SVM support into amdgpu with a Kconfig option.
This makes it easier to disable it in production kernels if this new
feature causes problems in production environments.

Use "depends on" instead of "select" for DEVICE_PRIVATE, as is
recommended for visible options.

Reviewed-by: Philip Yang <Philip.Yang@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
index aa829b3c992d..573f984b81fe 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
@@ -25,6 +25,8 @@
 #ifndef KFD_SVM_H_
 #define KFD_SVM_H_
 
+#if IS_ENABLED(CONFIG_HSA_AMD_SVM)
+
 #include <linux/rwsem.h>
 #include <linux/list.h>
 #include <linux/mutex.h>
@@ -173,4 +175,32 @@ void svm_range_dma_unmap(struct device *dev, dma_addr_t *dma_addr,
 void svm_range_free_dma_mappings(struct svm_range *prange);
 void svm_range_prefault(struct svm_range *prange, struct mm_struct *mm);
 
+#else
+
+struct kfd_process;
+
+static inline int svm_range_list_init(struct kfd_process *p)
+{
+	return 0;
+}
+static inline void svm_range_list_fini(struct kfd_process *p)
+{
+	/* empty */
+}
+
+static inline int svm_range_restore_pages(struct amdgpu_device *adev,
+					  unsigned int pasid, uint64_t addr)
+{
+	return -EFAULT;
+}
+
+static inline int svm_range_schedule_evict_svm_bo(
+		struct amdgpu_amdkfd_fence *fence)
+{
+	WARN_ONCE(1, "SVM eviction fence triggered, but SVM is disabled");
+	return -EINVAL;
+}
+
+#endif /* IS_ENABLED(CONFIG_HSA_AMD_SVM) */
+
 #endif /* KFD_SVM_H_ */