[RFC PATCH v1 11/15] drm/msm: Add a helper function for a per-instance address space

[Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>]

Add a helper function to create a GEM address space attached to
an iommu auxiliary domain for a per-instance pagetable.

Signed-off-by: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>
---

 drivers/gpu/drm/msm/msm_drv.h     |  4 +++
 drivers/gpu/drm/msm/msm_gem_vma.c | 53 +++++++++++++++++++++++----------------
 2 files changed, 36 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 3140e8f..4423be0 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -258,6 +258,10 @@ struct msm_gem_address_space *
 msm_gem_address_space_create_a2xx(struct device *dev, struct msm_gpu *gpu,
 		const char *name, uint64_t va_start, uint64_t va_end);
 
+struct msm_gem_address_space *
+msm_gem_address_space_create_instance(struct device *dev, const char *name,
+		u64 va_start, u64 va_end);
+
 int msm_register_mmu(struct drm_device *dev, struct msm_mmu *mmu);
 void msm_unregister_mmu(struct drm_device *dev, struct msm_mmu *mmu);
 
diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c
index 49c0482..4364bf8 100644
--- a/drivers/gpu/drm/msm/msm_gem_vma.c
+++ b/drivers/gpu/drm/msm/msm_gem_vma.c
@@ -136,14 +136,12 @@ int msm_gem_init_vma(struct msm_gem_address_space *aspace,
 	return 0;
 }
 
-
-struct msm_gem_address_space *
-msm_gem_address_space_create(struct device *dev, struct iommu_domain *domain,
-		const char *name)
+static struct msm_gem_address_space *
+msm_gem_address_space_new(struct msm_mmu *mmu, const char *name,
+		u64 va_start, u64 va_end)
 {
 	struct msm_gem_address_space *aspace;
-	u64 size = domain->geometry.aperture_end -
-		domain->geometry.aperture_start;
+	u64 size = va_end - va_start;
 
 	aspace = kzalloc(sizeof(*aspace), GFP_KERNEL);
 	if (!aspace)
@@ -151,10 +149,9 @@ msm_gem_address_space_create(struct device *dev, struct iommu_domain *domain,
 
 	spin_lock_init(&aspace->lock);
 	aspace->name = name;
-	aspace->mmu = msm_iommu_new(dev, domain);
+	aspace->mmu = mmu;
 
-	drm_mm_init(&aspace->mm, (domain->geometry.aperture_start >> PAGE_SHIFT),
-		size >> PAGE_SHIFT);
+	drm_mm_init(&aspace->mm, (va_start >> PAGE_SHIFT), size >> PAGE_SHIFT);
 
 	kref_init(&aspace->kref);
 
@@ -162,24 +159,38 @@ msm_gem_address_space_create(struct device *dev, struct iommu_domain *domain,
 }
 
 struct msm_gem_address_space *
+msm_gem_address_space_create(struct device *dev, struct iommu_domain *domain,
+		const char *name)
+{
+	struct msm_mmu *mmu = msm_iommu_new(dev, domain);
+
+	if (IS_ERR(mmu))
+		return ERR_CAST(mmu);
+
+	return msm_gem_address_space_new(mmu, name,
+		domain->geometry.aperture_start, domain->geometry.aperture_end);
+}
+
+struct msm_gem_address_space *
 msm_gem_address_space_create_a2xx(struct device *dev, struct msm_gpu *gpu,
 		const char *name, uint64_t va_start, uint64_t va_end)
 {
-	struct msm_gem_address_space *aspace;
-	u64 size = va_end - va_start;
+	struct msm_mmu *mmu = msm_gpummu_new(dev, gpu);
 
-	aspace = kzalloc(sizeof(*aspace), GFP_KERNEL);
-	if (!aspace)
-		return ERR_PTR(-ENOMEM);
+	if (IS_ERR(mmu))
+		return ERR_CAST(mmu);
 
-	spin_lock_init(&aspace->lock);
-	aspace->name = name;
-	aspace->mmu = msm_gpummu_new(dev, gpu);
+	return msm_gem_address_space_new(mmu, name, va_start, va_end);
+}
 
-	drm_mm_init(&aspace->mm, (va_start >> PAGE_SHIFT),
-		size >> PAGE_SHIFT);
+struct msm_gem_address_space *
+msm_gem_address_space_create_instance(struct device *dev, const char *name,
+		u64 va_start, u64 va_end)
+{
+	struct msm_mmu *mmu = msm_iommu_new_instance(dev);
 
-	kref_init(&aspace->kref);
+	if (IS_ERR(mmu))
+		return ERR_CAST(mmu);
 
-	return aspace;
+	return msm_gem_address_space_new(mmu, name, va_start, va_end);
 }
-- 
2.7.4