[PATCH] drm/amdgpu: fix HMM config dependency issue

[Yang, Philip]

Only select HMM_MIRROR will get kernel config dependency warnings
if CONFIG_HMM is missing in the config. Add depends on HMM will
solve the issue.

Add conditional compilation to fix compilation errors if HMM_MIRROR
is not enabled as HMM config is not enabled.

Change-Id: I1b44a0b5285bbef5e98bfb045d1d82c167af1cb8
Signed-off-by: Philip Yang <Philip.Yang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/Kconfig      |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c |  6 ++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 12 ++++++++++++
 3 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/Kconfig b/drivers/gpu/drm/amd/amdgpu/Kconfig
index 960a63355705..67553effb649 100644
--- a/drivers/gpu/drm/amd/amdgpu/Kconfig
+++ b/drivers/gpu/drm/amd/amdgpu/Kconfig
@@ -26,6 +26,7 @@ config DRM_AMDGPU_CIK
 config DRM_AMDGPU_USERPTR
 	bool "Always enable userptr write support"
 	depends on DRM_AMDGPU
+	depends on ARCH_HAS_HMM
 	select HMM_MIRROR
 	help
 	  This option selects CONFIG_HMM and CONFIG_HMM_MIRROR if it
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 1e675048f790..c1dbca14dce5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -712,7 +712,9 @@ struct amdgpu_ttm_tt {
 	uint64_t		userptr;
 	struct task_struct	*usertask;
 	uint32_t		userflags;
+#if IS_ENABLED(CONFIG_DRM_AMDGPU_USERPTR)
 	struct hmm_range	range;
+#endif
 };
 
 /**
@@ -722,6 +724,7 @@ struct amdgpu_ttm_tt {
  * Calling function must call amdgpu_ttm_tt_userptr_range_done() once and only
  * once afterwards to stop HMM tracking
  */
+#if IS_ENABLED(CONFIG_DRM_AMDGPU_USERPTR)
 int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
 {
 	struct amdgpu_ttm_tt *gtt = (void *)ttm;
@@ -804,6 +807,7 @@ bool amdgpu_ttm_tt_get_user_pages_done(struct ttm_tt *ttm)
 
 	return r;
 }
+#endif
 
 /**
  * amdgpu_ttm_tt_set_user_pages - Copy pages in, putting old pages as necessary.
@@ -904,9 +908,11 @@ static void amdgpu_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
 
 	sg_free_table(ttm->sg);
 
+#if IS_ENABLED(CONFIG_DRM_AMDGPU_USERPTR)
 	if (gtt->range.pfns &&
 	    ttm->pages[0] == hmm_pfn_to_page(&gtt->range, gtt->range.pfns[0]))
 		WARN_ONCE(1, "Missing get_user_page_done\n");
+#endif
 }
 
 int amdgpu_ttm_gart_bind(struct amdgpu_device *adev,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
index 8988c87fff9d..c9d87271a4cb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
@@ -101,8 +101,20 @@ int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma);
 int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo);
 int amdgpu_ttm_recover_gart(struct ttm_buffer_object *tbo);
 
+#if IS_ENABLED(CONFIG_DRM_AMDGPU_USERPTR)
 int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages);
 bool amdgpu_ttm_tt_get_user_pages_done(struct ttm_tt *ttm);
+#else
+static inline int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
+{
+	return -EPERM;
+}
+static inline bool amdgpu_ttm_tt_get_user_pages_done(struct ttm_tt *ttm)
+{
+	return false;
+}
+#endif
+
 void amdgpu_ttm_tt_set_user_pages(struct ttm_tt *ttm, struct page **pages);
 void amdgpu_ttm_tt_mark_user_pages(struct ttm_tt *ttm);
 int amdgpu_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr,
-- 
2.17.1