[PATCH 12/14] drm/msm: Add support for per-instance address spaces

[Jordan Crouse]

Add a function to allocate a new pasid from a existing
MMU domain and create a per-instance address space.

Signed-off-by: Jordan Crouse <jcrouse at codeaurora.org>
---
 drivers/gpu/drm/msm/msm_drv.h     |  3 +++
 drivers/gpu/drm/msm/msm_gem_vma.c | 36 +++++++++++++++++++++++++++++++-----
 2 files changed, 34 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 0499b1708f52..4fbc3188d776 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -178,6 +178,9 @@ void msm_gem_address_space_put(struct msm_gem_address_space *aspace);
 struct msm_gem_address_space *
 msm_gem_address_space_create(struct device *dev, struct iommu_domain *domain,
 		const char *name);
+struct msm_gem_address_space *
+msm_gem_address_space_create_instance(struct msm_mmu *parent, const char *name,
+		u64 start, u64 end);
 
 void msm_gem_submit_free(struct msm_gem_submit *submit);
 int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c
index d34e331554f3..ef33026f593f 100644
--- a/drivers/gpu/drm/msm/msm_gem_vma.c
+++ b/drivers/gpu/drm/msm/msm_gem_vma.c
@@ -92,10 +92,11 @@ msm_gem_map_vma(struct msm_gem_address_space *aspace,
 }
 
 struct msm_gem_address_space *
-msm_gem_address_space_create(struct device *dev, struct iommu_domain *domain,
-		const char *name)
+msm_gem_address_space_new(struct msm_mmu *mmu, const char *name,
+		u64 start, u64 end)
 {
 	struct msm_gem_address_space *aspace;
+	u64 size = end - start;
 
 	aspace = kzalloc(sizeof(*aspace), GFP_KERNEL);
 	if (!aspace)
@@ -103,12 +104,37 @@ 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),
-			(domain->geometry.aperture_end >> PAGE_SHIFT) - 1);
+	drm_mm_init(&aspace->mm, (start >> PAGE_SHIFT), size >> PAGE_SHIFT);
 
 	kref_init(&aspace->kref);
 
 	return aspace;
 }
+
+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_instance(struct msm_mmu *parent, const char *name,
+		u64 start, u64 end)
+{
+	struct msm_mmu *instance = msm_iommu_pasid_new(parent);
+
+	if (IS_ERR(instance))
+		return ERR_CAST(instance);
+
+	return msm_gem_address_space_new(instance, name, start, end);
+}
-- 
2.16.1