drm/msm: support multiple address spaces

We can have various combinations of 64b and 32b address space, ie. 64b
CPU but 32b display and gpu, or 64b CPU and GPU but 32b display.  So
best to decouple the device iova's from mmap offset.

Signed-off-by: Rob Clark <robdclark@gmail.com>

1 files changed, 90 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c
new file mode 100644
index 000000000000..a311d26ccb21
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_gem_vma.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2016 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "msm_drv.h"
+#include "msm_gem.h"
+#include "msm_mmu.h"
+
+void
+msm_gem_unmap_vma(struct msm_gem_address_space *aspace,
+		struct msm_gem_vma *vma, struct sg_table *sgt)
+{
+	if (!vma->iova)
+		return;
+
+	if (aspace->mmu) {
+		unsigned size = vma->node.size << PAGE_SHIFT;
+		aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, sgt, size);
+	}
+
+	drm_mm_remove_node(&vma->node);
+
+	vma->iova = 0;
+}
+
+int
+msm_gem_map_vma(struct msm_gem_address_space *aspace,
+		struct msm_gem_vma *vma, struct sg_table *sgt, int npages)
+{
+	int ret;
+
+	if (WARN_ON(drm_mm_node_allocated(&vma->node)))
+		return 0;
+
+	ret = drm_mm_insert_node(&aspace->mm, &vma->node, npages,
+			0, DRM_MM_SEARCH_DEFAULT);
+	if (ret)
+		return ret;
+
+	vma->iova = vma->node.start << PAGE_SHIFT;
+
+	if (aspace->mmu) {
+		unsigned size = npages << PAGE_SHIFT;
+		ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt,
+				size, IOMMU_READ | IOMMU_WRITE);
+	}
+
+	return ret;
+}
+
+void
+msm_gem_address_space_destroy(struct msm_gem_address_space *aspace)
+{
+	drm_mm_takedown(&aspace->mm);
+	if (aspace->mmu)
+		aspace->mmu->funcs->destroy(aspace->mmu);
+	kfree(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 *aspace;
+
+	aspace = kzalloc(sizeof(*aspace), GFP_KERNEL);
+	if (!aspace)
+		return ERR_PTR(-ENOMEM);
+
+	aspace->name = name;
+	aspace->mmu = msm_iommu_new(dev, domain);
+
+	drm_mm_init(&aspace->mm, (domain->geometry.aperture_start >> PAGE_SHIFT),
+			(domain->geometry.aperture_end >> PAGE_SHIFT) - 1);
+
+	return aspace;
+}