Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1294 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
new file mode 100644
index 000000000..1dee0d18a
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -0,0 +1,1294 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ */
+
+#include <linux/dma-map-ops.h>
+#include <linux/vmalloc.h>
+#include <linux/spinlock.h>
+#include <linux/shmem_fs.h>
+#include <linux/dma-buf.h>
+#include <linux/pfn_t.h>
+
+#include <drm/drm_prime.h>
+
+#include "msm_drv.h"
+#include "msm_fence.h"
+#include "msm_gem.h"
+#include "msm_gpu.h"
+#include "msm_mmu.h"
+
+static void update_lru(struct drm_gem_object *obj);
+
+static dma_addr_t physaddr(struct drm_gem_object *obj)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct msm_drm_private *priv = obj->dev->dev_private;
+	return (((dma_addr_t)msm_obj->vram_node->start) << PAGE_SHIFT) +
+			priv->vram.paddr;
+}
+
+static bool use_pages(struct drm_gem_object *obj)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	return !msm_obj->vram_node;
+}
+
+/*
+ * Cache sync.. this is a bit over-complicated, to fit dma-mapping
+ * API.  Really GPU cache is out of scope here (handled on cmdstream)
+ * and all we need to do is invalidate newly allocated pages before
+ * mapping to CPU as uncached/writecombine.
+ *
+ * On top of this, we have the added headache, that depending on
+ * display generation, the display's iommu may be wired up to either
+ * the toplevel drm device (mdss), or to the mdp sub-node, meaning
+ * that here we either have dma-direct or iommu ops.
+ *
+ * Let this be a cautionary tail of abstraction gone wrong.
+ */
+
+static void sync_for_device(struct msm_gem_object *msm_obj)
+{
+	struct device *dev = msm_obj->base.dev->dev;
+
+	dma_map_sgtable(dev, msm_obj->sgt, DMA_BIDIRECTIONAL, 0);
+}
+
+static void sync_for_cpu(struct msm_gem_object *msm_obj)
+{
+	struct device *dev = msm_obj->base.dev->dev;
+
+	dma_unmap_sgtable(dev, msm_obj->sgt, DMA_BIDIRECTIONAL, 0);
+}
+
+/* allocate pages from VRAM carveout, used when no IOMMU: */
+static struct page **get_pages_vram(struct drm_gem_object *obj, int npages)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct msm_drm_private *priv = obj->dev->dev_private;
+	dma_addr_t paddr;
+	struct page **p;
+	int ret, i;
+
+	p = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
+	if (!p)
+		return ERR_PTR(-ENOMEM);
+
+	spin_lock(&priv->vram.lock);
+	ret = drm_mm_insert_node(&priv->vram.mm, msm_obj->vram_node, npages);
+	spin_unlock(&priv->vram.lock);
+	if (ret) {
+		kvfree(p);
+		return ERR_PTR(ret);
+	}
+
+	paddr = physaddr(obj);
+	for (i = 0; i < npages; i++) {
+		p[i] = pfn_to_page(__phys_to_pfn(paddr));
+		paddr += PAGE_SIZE;
+	}
+
+	return p;
+}
+
+static struct page **get_pages(struct drm_gem_object *obj)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+
+	msm_gem_assert_locked(obj);
+
+	if (!msm_obj->pages) {
+		struct drm_device *dev = obj->dev;
+		struct page **p;
+		int npages = obj->size >> PAGE_SHIFT;
+
+		if (use_pages(obj))
+			p = drm_gem_get_pages(obj);
+		else
+			p = get_pages_vram(obj, npages);
+
+		if (IS_ERR(p)) {
+			DRM_DEV_ERROR(dev->dev, "could not get pages: %ld\n",
+					PTR_ERR(p));
+			return p;
+		}
+
+		msm_obj->pages = p;
+
+		msm_obj->sgt = drm_prime_pages_to_sg(obj->dev, p, npages);
+		if (IS_ERR(msm_obj->sgt)) {
+			void *ptr = ERR_CAST(msm_obj->sgt);
+
+			DRM_DEV_ERROR(dev->dev, "failed to allocate sgt\n");
+			msm_obj->sgt = NULL;
+			return ptr;
+		}
+
+		/* For non-cached buffers, ensure the new pages are clean
+		 * because display controller, GPU, etc. are not coherent:
+		 */
+		if (msm_obj->flags & MSM_BO_WC)
+			sync_for_device(msm_obj);
+
+		update_lru(obj);
+	}
+
+	return msm_obj->pages;
+}
+
+static void put_pages_vram(struct drm_gem_object *obj)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct msm_drm_private *priv = obj->dev->dev_private;
+
+	spin_lock(&priv->vram.lock);
+	drm_mm_remove_node(msm_obj->vram_node);
+	spin_unlock(&priv->vram.lock);
+
+	kvfree(msm_obj->pages);
+}
+
+static void put_pages(struct drm_gem_object *obj)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+
+	if (msm_obj->pages) {
+		if (msm_obj->sgt) {
+			/* For non-cached buffers, ensure the new
+			 * pages are clean because display controller,
+			 * GPU, etc. are not coherent:
+			 */
+			if (msm_obj->flags & MSM_BO_WC)
+				sync_for_cpu(msm_obj);
+
+			sg_free_table(msm_obj->sgt);
+			kfree(msm_obj->sgt);
+			msm_obj->sgt = NULL;
+		}
+
+		if (use_pages(obj))
+			drm_gem_put_pages(obj, msm_obj->pages, true, false);
+		else
+			put_pages_vram(obj);
+
+		msm_obj->pages = NULL;
+		update_lru(obj);
+	}
+}
+
+static struct page **msm_gem_pin_pages_locked(struct drm_gem_object *obj)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct page **p;
+
+	msm_gem_assert_locked(obj);
+
+	if (GEM_WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED)) {
+		return ERR_PTR(-EBUSY);
+	}
+
+	p = get_pages(obj);
+	if (!IS_ERR(p)) {
+		to_msm_bo(obj)->pin_count++;
+		update_lru(obj);
+	}
+
+	return p;
+}
+
+struct page **msm_gem_pin_pages(struct drm_gem_object *obj)
+{
+	struct page **p;
+
+	msm_gem_lock(obj);
+	p = msm_gem_pin_pages_locked(obj);
+	msm_gem_unlock(obj);
+
+	return p;
+}
+
+void msm_gem_unpin_pages(struct drm_gem_object *obj)
+{
+	msm_gem_lock(obj);
+	msm_gem_unpin_locked(obj);
+	msm_gem_unlock(obj);
+}
+
+static pgprot_t msm_gem_pgprot(struct msm_gem_object *msm_obj, pgprot_t prot)
+{
+	if (msm_obj->flags & MSM_BO_WC)
+		return pgprot_writecombine(prot);
+	return prot;
+}
+
+static vm_fault_t msm_gem_fault(struct vm_fault *vmf)
+{
+	struct vm_area_struct *vma = vmf->vma;
+	struct drm_gem_object *obj = vma->vm_private_data;
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct page **pages;
+	unsigned long pfn;
+	pgoff_t pgoff;
+	int err;
+	vm_fault_t ret;
+
+	/*
+	 * vm_ops.open/drm_gem_mmap_obj and close get and put
+	 * a reference on obj. So, we dont need to hold one here.
+	 */
+	err = msm_gem_lock_interruptible(obj);
+	if (err) {
+		ret = VM_FAULT_NOPAGE;
+		goto out;
+	}
+
+	if (GEM_WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED)) {
+		msm_gem_unlock(obj);
+		return VM_FAULT_SIGBUS;
+	}
+
+	/* make sure we have pages attached now */
+	pages = get_pages(obj);
+	if (IS_ERR(pages)) {
+		ret = vmf_error(PTR_ERR(pages));
+		goto out_unlock;
+	}
+
+	/* We don't use vmf->pgoff since that has the fake offset: */
+	pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
+
+	pfn = page_to_pfn(pages[pgoff]);
+
+	VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
+			pfn, pfn << PAGE_SHIFT);
+
+	ret = vmf_insert_pfn(vma, vmf->address, pfn);
+
+out_unlock:
+	msm_gem_unlock(obj);
+out:
+	return ret;
+}
+
+/** get mmap offset */
+static uint64_t mmap_offset(struct drm_gem_object *obj)
+{
+	struct drm_device *dev = obj->dev;
+	int ret;
+
+	msm_gem_assert_locked(obj);
+
+	/* Make it mmapable */
+	ret = drm_gem_create_mmap_offset(obj);
+
+	if (ret) {
+		DRM_DEV_ERROR(dev->dev, "could not allocate mmap offset\n");
+		return 0;
+	}
+
+	return drm_vma_node_offset_addr(&obj->vma_node);
+}
+
+uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj)
+{
+	uint64_t offset;
+
+	msm_gem_lock(obj);
+	offset = mmap_offset(obj);
+	msm_gem_unlock(obj);
+	return offset;
+}
+
+static struct msm_gem_vma *add_vma(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct msm_gem_vma *vma;
+
+	msm_gem_assert_locked(obj);
+
+	vma = kzalloc(sizeof(*vma), GFP_KERNEL);
+	if (!vma)
+		return ERR_PTR(-ENOMEM);
+
+	vma->aspace = aspace;
+
+	list_add_tail(&vma->list, &msm_obj->vmas);
+
+	return vma;
+}
+
+static struct msm_gem_vma *lookup_vma(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct msm_gem_vma *vma;
+
+	msm_gem_assert_locked(obj);
+
+	list_for_each_entry(vma, &msm_obj->vmas, list) {
+		if (vma->aspace == aspace)
+			return vma;
+	}
+
+	return NULL;
+}
+
+static void del_vma(struct msm_gem_vma *vma)
+{
+	if (!vma)
+		return;
+
+	list_del(&vma->list);
+	kfree(vma);
+}
+
+/*
+ * If close is true, this also closes the VMA (releasing the allocated
+ * iova range) in addition to removing the iommu mapping.  In the eviction
+ * case (!close), we keep the iova allocated, but only remove the iommu
+ * mapping.
+ */
+static void
+put_iova_spaces(struct drm_gem_object *obj, bool close)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct msm_gem_vma *vma;
+
+	msm_gem_assert_locked(obj);
+
+	list_for_each_entry(vma, &msm_obj->vmas, list) {
+		if (vma->aspace) {
+			msm_gem_purge_vma(vma->aspace, vma);
+			if (close)
+				msm_gem_close_vma(vma->aspace, vma);
+		}
+	}
+}
+
+/* Called with msm_obj locked */
+static void
+put_iova_vmas(struct drm_gem_object *obj)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct msm_gem_vma *vma, *tmp;
+
+	msm_gem_assert_locked(obj);
+
+	list_for_each_entry_safe(vma, tmp, &msm_obj->vmas, list) {
+		del_vma(vma);
+	}
+}
+
+static struct msm_gem_vma *get_vma_locked(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace,
+		u64 range_start, u64 range_end)
+{
+	struct msm_gem_vma *vma;
+
+	msm_gem_assert_locked(obj);
+
+	vma = lookup_vma(obj, aspace);
+
+	if (!vma) {
+		int ret;
+
+		vma = add_vma(obj, aspace);
+		if (IS_ERR(vma))
+			return vma;
+
+		ret = msm_gem_init_vma(aspace, vma, obj->size,
+			range_start, range_end);
+		if (ret) {
+			del_vma(vma);
+			return ERR_PTR(ret);
+		}
+	} else {
+		GEM_WARN_ON(vma->iova < range_start);
+		GEM_WARN_ON((vma->iova + obj->size) > range_end);
+	}
+
+	return vma;
+}
+
+int msm_gem_pin_vma_locked(struct drm_gem_object *obj, struct msm_gem_vma *vma)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct page **pages;
+	int ret, prot = IOMMU_READ;
+
+	if (!(msm_obj->flags & MSM_BO_GPU_READONLY))
+		prot |= IOMMU_WRITE;
+
+	if (msm_obj->flags & MSM_BO_MAP_PRIV)
+		prot |= IOMMU_PRIV;
+
+	if (msm_obj->flags & MSM_BO_CACHED_COHERENT)
+		prot |= IOMMU_CACHE;
+
+	msm_gem_assert_locked(obj);
+
+	if (GEM_WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED))
+		return -EBUSY;
+
+	pages = msm_gem_pin_pages_locked(obj);
+	if (IS_ERR(pages))
+		return PTR_ERR(pages);
+
+	ret = msm_gem_map_vma(vma->aspace, vma, prot, msm_obj->sgt, obj->size);
+	if (ret)
+		msm_gem_unpin_locked(obj);
+
+	return ret;
+}
+
+void msm_gem_unpin_locked(struct drm_gem_object *obj)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+
+	msm_gem_assert_locked(obj);
+
+	msm_obj->pin_count--;
+	GEM_WARN_ON(msm_obj->pin_count < 0);
+
+	update_lru(obj);
+}
+
+struct msm_gem_vma *msm_gem_get_vma_locked(struct drm_gem_object *obj,
+					   struct msm_gem_address_space *aspace)
+{
+	return get_vma_locked(obj, aspace, 0, U64_MAX);
+}
+
+static int get_and_pin_iova_range_locked(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace, uint64_t *iova,
+		u64 range_start, u64 range_end)
+{
+	struct msm_gem_vma *vma;
+	int ret;
+
+	msm_gem_assert_locked(obj);
+
+	vma = get_vma_locked(obj, aspace, range_start, range_end);
+	if (IS_ERR(vma))
+		return PTR_ERR(vma);
+
+	ret = msm_gem_pin_vma_locked(obj, vma);
+	if (!ret)
+		*iova = vma->iova;
+
+	return ret;
+}
+
+/*
+ * get iova and pin it. Should have a matching put
+ * limits iova to specified range (in pages)
+ */
+int msm_gem_get_and_pin_iova_range(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace, uint64_t *iova,
+		u64 range_start, u64 range_end)
+{
+	int ret;
+
+	msm_gem_lock(obj);
+	ret = get_and_pin_iova_range_locked(obj, aspace, iova, range_start, range_end);
+	msm_gem_unlock(obj);
+
+	return ret;
+}
+
+/* get iova and pin it. Should have a matching put */
+int msm_gem_get_and_pin_iova(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace, uint64_t *iova)
+{
+	return msm_gem_get_and_pin_iova_range(obj, aspace, iova, 0, U64_MAX);
+}
+
+/*
+ * Get an iova but don't pin it. Doesn't need a put because iovas are currently
+ * valid for the life of the object
+ */
+int msm_gem_get_iova(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace, uint64_t *iova)
+{
+	struct msm_gem_vma *vma;
+	int ret = 0;
+
+	msm_gem_lock(obj);
+	vma = get_vma_locked(obj, aspace, 0, U64_MAX);
+	if (IS_ERR(vma)) {
+		ret = PTR_ERR(vma);
+	} else {
+		*iova = vma->iova;
+	}
+	msm_gem_unlock(obj);
+
+	return ret;
+}
+
+static int clear_iova(struct drm_gem_object *obj,
+		      struct msm_gem_address_space *aspace)
+{
+	struct msm_gem_vma *vma = lookup_vma(obj, aspace);
+
+	if (!vma)
+		return 0;
+
+	if (msm_gem_vma_inuse(vma))
+		return -EBUSY;
+
+	msm_gem_purge_vma(vma->aspace, vma);
+	msm_gem_close_vma(vma->aspace, vma);
+	del_vma(vma);
+
+	return 0;
+}
+
+/*
+ * Get the requested iova but don't pin it.  Fails if the requested iova is
+ * not available.  Doesn't need a put because iovas are currently valid for
+ * the life of the object.
+ *
+ * Setting an iova of zero will clear the vma.
+ */
+int msm_gem_set_iova(struct drm_gem_object *obj,
+		     struct msm_gem_address_space *aspace, uint64_t iova)
+{
+	int ret = 0;
+
+	msm_gem_lock(obj);
+	if (!iova) {
+		ret = clear_iova(obj, aspace);
+	} else {
+		struct msm_gem_vma *vma;
+		vma = get_vma_locked(obj, aspace, iova, iova + obj->size);
+		if (IS_ERR(vma)) {
+			ret = PTR_ERR(vma);
+		} else if (GEM_WARN_ON(vma->iova != iova)) {
+			clear_iova(obj, aspace);
+			ret = -EBUSY;
+		}
+	}
+	msm_gem_unlock(obj);
+
+	return ret;
+}
+
+/*
+ * Unpin a iova by updating the reference counts. The memory isn't actually
+ * purged until something else (shrinker, mm_notifier, destroy, etc) decides
+ * to get rid of it
+ */
+void msm_gem_unpin_iova(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace)
+{
+	struct msm_gem_vma *vma;
+
+	msm_gem_lock(obj);
+	vma = lookup_vma(obj, aspace);
+	if (!GEM_WARN_ON(!vma)) {
+		msm_gem_unpin_vma(vma);
+		msm_gem_unpin_locked(obj);
+	}
+	msm_gem_unlock(obj);
+}
+
+int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
+		struct drm_mode_create_dumb *args)
+{
+	args->pitch = align_pitch(args->width, args->bpp);
+	args->size  = PAGE_ALIGN(args->pitch * args->height);
+	return msm_gem_new_handle(dev, file, args->size,
+			MSM_BO_SCANOUT | MSM_BO_WC, &args->handle, "dumb");
+}
+
+int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
+		uint32_t handle, uint64_t *offset)
+{
+	struct drm_gem_object *obj;
+	int ret = 0;
+
+	/* GEM does all our handle to object mapping */
+	obj = drm_gem_object_lookup(file, handle);
+	if (obj == NULL) {
+		ret = -ENOENT;
+		goto fail;
+	}
+
+	*offset = msm_gem_mmap_offset(obj);
+
+	drm_gem_object_put(obj);
+
+fail:
+	return ret;
+}
+
+static void *get_vaddr(struct drm_gem_object *obj, unsigned madv)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	int ret = 0;
+
+	msm_gem_assert_locked(obj);
+
+	if (obj->import_attach)
+		return ERR_PTR(-ENODEV);
+
+	if (GEM_WARN_ON(msm_obj->madv > madv)) {
+		DRM_DEV_ERROR(obj->dev->dev, "Invalid madv state: %u vs %u\n",
+			msm_obj->madv, madv);
+		return ERR_PTR(-EBUSY);
+	}
+
+	/* increment vmap_count *before* vmap() call, so shrinker can
+	 * check vmap_count (is_vunmapable()) outside of msm_obj lock.
+	 * This guarantees that we won't try to msm_gem_vunmap() this
+	 * same object from within the vmap() call (while we already
+	 * hold msm_obj lock)
+	 */
+	msm_obj->vmap_count++;
+
+	if (!msm_obj->vaddr) {
+		struct page **pages = get_pages(obj);
+		if (IS_ERR(pages)) {
+			ret = PTR_ERR(pages);
+			goto fail;
+		}
+		msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
+				VM_MAP, msm_gem_pgprot(msm_obj, PAGE_KERNEL));
+		if (msm_obj->vaddr == NULL) {
+			ret = -ENOMEM;
+			goto fail;
+		}
+
+		update_lru(obj);
+	}
+
+	return msm_obj->vaddr;
+
+fail:
+	msm_obj->vmap_count--;
+	return ERR_PTR(ret);
+}
+
+void *msm_gem_get_vaddr_locked(struct drm_gem_object *obj)
+{
+	return get_vaddr(obj, MSM_MADV_WILLNEED);
+}
+
+void *msm_gem_get_vaddr(struct drm_gem_object *obj)
+{
+	void *ret;
+
+	msm_gem_lock(obj);
+	ret = msm_gem_get_vaddr_locked(obj);
+	msm_gem_unlock(obj);
+
+	return ret;
+}
+
+/*
+ * Don't use this!  It is for the very special case of dumping
+ * submits from GPU hangs or faults, were the bo may already
+ * be MSM_MADV_DONTNEED, but we know the buffer is still on the
+ * active list.
+ */
+void *msm_gem_get_vaddr_active(struct drm_gem_object *obj)
+{
+	return get_vaddr(obj, __MSM_MADV_PURGED);
+}
+
+void msm_gem_put_vaddr_locked(struct drm_gem_object *obj)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+
+	msm_gem_assert_locked(obj);
+	GEM_WARN_ON(msm_obj->vmap_count < 1);
+
+	msm_obj->vmap_count--;
+}
+
+void msm_gem_put_vaddr(struct drm_gem_object *obj)
+{
+	msm_gem_lock(obj);
+	msm_gem_put_vaddr_locked(obj);
+	msm_gem_unlock(obj);
+}
+
+/* Update madvise status, returns true if not purged, else
+ * false or -errno.
+ */
+int msm_gem_madvise(struct drm_gem_object *obj, unsigned madv)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+
+	msm_gem_lock(obj);
+
+	if (msm_obj->madv != __MSM_MADV_PURGED)
+		msm_obj->madv = madv;
+
+	madv = msm_obj->madv;
+
+	/* If the obj is inactive, we might need to move it
+	 * between inactive lists
+	 */
+	update_lru(obj);
+
+	msm_gem_unlock(obj);
+
+	return (madv != __MSM_MADV_PURGED);
+}
+
+void msm_gem_purge(struct drm_gem_object *obj)
+{
+	struct drm_device *dev = obj->dev;
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+
+	msm_gem_assert_locked(obj);
+	GEM_WARN_ON(!is_purgeable(msm_obj));
+
+	/* Get rid of any iommu mapping(s): */
+	put_iova_spaces(obj, true);
+
+	msm_gem_vunmap(obj);
+
+	drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
+
+	put_pages(obj);
+
+	put_iova_vmas(obj);
+
+	msm_obj->madv = __MSM_MADV_PURGED;
+
+	drm_gem_free_mmap_offset(obj);
+
+	/* Our goal here is to return as much of the memory as
+	 * is possible back to the system as we are called from OOM.
+	 * To do this we must instruct the shmfs to drop all of its
+	 * backing pages, *now*.
+	 */
+	shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1);
+
+	invalidate_mapping_pages(file_inode(obj->filp)->i_mapping,
+			0, (loff_t)-1);
+}
+
+/*
+ * Unpin the backing pages and make them available to be swapped out.
+ */
+void msm_gem_evict(struct drm_gem_object *obj)
+{
+	struct drm_device *dev = obj->dev;
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+
+	msm_gem_assert_locked(obj);
+	GEM_WARN_ON(is_unevictable(msm_obj));
+
+	/* Get rid of any iommu mapping(s): */
+	put_iova_spaces(obj, false);
+
+	drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
+
+	put_pages(obj);
+}
+
+void msm_gem_vunmap(struct drm_gem_object *obj)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+
+	msm_gem_assert_locked(obj);
+
+	if (!msm_obj->vaddr || GEM_WARN_ON(!is_vunmapable(msm_obj)))
+		return;
+
+	vunmap(msm_obj->vaddr);
+	msm_obj->vaddr = NULL;
+}
+
+static void update_lru(struct drm_gem_object *obj)
+{
+	struct msm_drm_private *priv = obj->dev->dev_private;
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+
+	msm_gem_assert_locked(&msm_obj->base);
+
+	if (!msm_obj->pages) {
+		GEM_WARN_ON(msm_obj->pin_count);
+		GEM_WARN_ON(msm_obj->vmap_count);
+
+		drm_gem_lru_move_tail(&priv->lru.unbacked, obj);
+	} else if (msm_obj->pin_count || msm_obj->vmap_count) {
+		drm_gem_lru_move_tail(&priv->lru.pinned, obj);
+	} else if (msm_obj->madv == MSM_MADV_WILLNEED) {
+		drm_gem_lru_move_tail(&priv->lru.willneed, obj);
+	} else {
+		GEM_WARN_ON(msm_obj->madv != MSM_MADV_DONTNEED);
+
+		drm_gem_lru_move_tail(&priv->lru.dontneed, obj);
+	}
+}
+
+bool msm_gem_active(struct drm_gem_object *obj)
+{
+	msm_gem_assert_locked(obj);
+
+	if (to_msm_bo(obj)->pin_count)
+		return true;
+
+	return !dma_resv_test_signaled(obj->resv, dma_resv_usage_rw(true));
+}
+
+int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
+{
+	bool write = !!(op & MSM_PREP_WRITE);
+	unsigned long remain =
+		op & MSM_PREP_NOSYNC ? 0 : timeout_to_jiffies(timeout);
+	long ret;
+
+	ret = dma_resv_wait_timeout(obj->resv, dma_resv_usage_rw(write),
+				    true,  remain);
+	if (ret == 0)
+		return remain == 0 ? -EBUSY : -ETIMEDOUT;
+	else if (ret < 0)
+		return ret;
+
+	/* TODO cache maintenance */
+
+	return 0;
+}
+
+int msm_gem_cpu_fini(struct drm_gem_object *obj)
+{
+	/* TODO cache maintenance */
+	return 0;
+}
+
+#ifdef CONFIG_DEBUG_FS
+void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m,
+		struct msm_gem_stats *stats)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct dma_resv *robj = obj->resv;
+	struct msm_gem_vma *vma;
+	uint64_t off = drm_vma_node_start(&obj->vma_node);
+	const char *madv;
+
+	msm_gem_lock(obj);
+
+	stats->all.count++;
+	stats->all.size += obj->size;
+
+	if (msm_gem_active(obj)) {
+		stats->active.count++;
+		stats->active.size += obj->size;
+	}
+
+	if (msm_obj->pages) {
+		stats->resident.count++;
+		stats->resident.size += obj->size;
+	}
+
+	switch (msm_obj->madv) {
+	case __MSM_MADV_PURGED:
+		stats->purged.count++;
+		stats->purged.size += obj->size;
+		madv = " purged";
+		break;
+	case MSM_MADV_DONTNEED:
+		stats->purgeable.count++;
+		stats->purgeable.size += obj->size;
+		madv = " purgeable";
+		break;
+	case MSM_MADV_WILLNEED:
+	default:
+		madv = "";
+		break;
+	}
+
+	seq_printf(m, "%08x: %c %2d (%2d) %08llx %p",
+			msm_obj->flags, msm_gem_active(obj) ? 'A' : 'I',
+			obj->name, kref_read(&obj->refcount),
+			off, msm_obj->vaddr);
+
+	seq_printf(m, " %08zu %9s %-32s\n", obj->size, madv, msm_obj->name);
+
+	if (!list_empty(&msm_obj->vmas)) {
+
+		seq_puts(m, "      vmas:");
+
+		list_for_each_entry(vma, &msm_obj->vmas, list) {
+			const char *name, *comm;
+			if (vma->aspace) {
+				struct msm_gem_address_space *aspace = vma->aspace;
+				struct task_struct *task =
+					get_pid_task(aspace->pid, PIDTYPE_PID);
+				if (task) {
+					comm = kstrdup(task->comm, GFP_KERNEL);
+					put_task_struct(task);
+				} else {
+					comm = NULL;
+				}
+				name = aspace->name;
+			} else {
+				name = comm = NULL;
+			}
+			seq_printf(m, " [%s%s%s: aspace=%p, %08llx,%s,inuse=%d]",
+				name, comm ? ":" : "", comm ? comm : "",
+				vma->aspace, vma->iova,
+				vma->mapped ? "mapped" : "unmapped",
+				msm_gem_vma_inuse(vma));
+			kfree(comm);
+		}
+
+		seq_puts(m, "\n");
+	}
+
+	dma_resv_describe(robj, m);
+	msm_gem_unlock(obj);
+}
+
+void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
+{
+	struct msm_gem_stats stats = {};
+	struct msm_gem_object *msm_obj;
+
+	seq_puts(m, "   flags       id ref  offset   kaddr            size     madv      name\n");
+	list_for_each_entry(msm_obj, list, node) {
+		struct drm_gem_object *obj = &msm_obj->base;
+		seq_puts(m, "   ");
+		msm_gem_describe(obj, m, &stats);
+	}
+
+	seq_printf(m, "Total:     %4d objects, %9zu bytes\n",
+			stats.all.count, stats.all.size);
+	seq_printf(m, "Active:    %4d objects, %9zu bytes\n",
+			stats.active.count, stats.active.size);
+	seq_printf(m, "Resident:  %4d objects, %9zu bytes\n",
+			stats.resident.count, stats.resident.size);
+	seq_printf(m, "Purgeable: %4d objects, %9zu bytes\n",
+			stats.purgeable.count, stats.purgeable.size);
+	seq_printf(m, "Purged:    %4d objects, %9zu bytes\n",
+			stats.purged.count, stats.purged.size);
+}
+#endif
+
+/* don't call directly!  Use drm_gem_object_put() */
+static void msm_gem_free_object(struct drm_gem_object *obj)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct drm_device *dev = obj->dev;
+	struct msm_drm_private *priv = dev->dev_private;
+
+	mutex_lock(&priv->obj_lock);
+	list_del(&msm_obj->node);
+	mutex_unlock(&priv->obj_lock);
+
+	put_iova_spaces(obj, true);
+
+	if (obj->import_attach) {
+		GEM_WARN_ON(msm_obj->vaddr);
+
+		/* Don't drop the pages for imported dmabuf, as they are not
+		 * ours, just free the array we allocated:
+		 */
+		kvfree(msm_obj->pages);
+
+		put_iova_vmas(obj);
+
+		drm_prime_gem_destroy(obj, msm_obj->sgt);
+	} else {
+		msm_gem_vunmap(obj);
+		put_pages(obj);
+		put_iova_vmas(obj);
+	}
+
+	drm_gem_object_release(obj);
+
+	kfree(msm_obj);
+}
+
+static int msm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+
+	vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
+	vma->vm_page_prot = msm_gem_pgprot(msm_obj, vm_get_page_prot(vma->vm_flags));
+
+	return 0;
+}
+
+/* convenience method to construct a GEM buffer object, and userspace handle */
+int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
+		uint32_t size, uint32_t flags, uint32_t *handle,
+		char *name)
+{
+	struct drm_gem_object *obj;
+	int ret;
+
+	obj = msm_gem_new(dev, size, flags);
+
+	if (IS_ERR(obj))
+		return PTR_ERR(obj);
+
+	if (name)
+		msm_gem_object_set_name(obj, "%s", name);
+
+	ret = drm_gem_handle_create(file, obj, handle);
+
+	/* drop reference from allocate - handle holds it now */
+	drm_gem_object_put(obj);
+
+	return ret;
+}
+
+static const struct vm_operations_struct vm_ops = {
+	.fault = msm_gem_fault,
+	.open = drm_gem_vm_open,
+	.close = drm_gem_vm_close,
+};
+
+static const struct drm_gem_object_funcs msm_gem_object_funcs = {
+	.free = msm_gem_free_object,
+	.pin = msm_gem_prime_pin,
+	.unpin = msm_gem_prime_unpin,
+	.get_sg_table = msm_gem_prime_get_sg_table,
+	.vmap = msm_gem_prime_vmap,
+	.vunmap = msm_gem_prime_vunmap,
+	.mmap = msm_gem_object_mmap,
+	.vm_ops = &vm_ops,
+};
+
+static int msm_gem_new_impl(struct drm_device *dev,
+		uint32_t size, uint32_t flags,
+		struct drm_gem_object **obj)
+{
+	struct msm_drm_private *priv = dev->dev_private;
+	struct msm_gem_object *msm_obj;
+
+	switch (flags & MSM_BO_CACHE_MASK) {
+	case MSM_BO_CACHED:
+	case MSM_BO_WC:
+		break;
+	case MSM_BO_CACHED_COHERENT:
+		if (priv->has_cached_coherent)
+			break;
+		fallthrough;
+	default:
+		DRM_DEV_DEBUG(dev->dev, "invalid cache flag: %x\n",
+				(flags & MSM_BO_CACHE_MASK));
+		return -EINVAL;
+	}
+
+	msm_obj = kzalloc(sizeof(*msm_obj), GFP_KERNEL);
+	if (!msm_obj)
+		return -ENOMEM;
+
+	msm_obj->flags = flags;
+	msm_obj->madv = MSM_MADV_WILLNEED;
+
+	INIT_LIST_HEAD(&msm_obj->node);
+	INIT_LIST_HEAD(&msm_obj->vmas);
+
+	*obj = &msm_obj->base;
+	(*obj)->funcs = &msm_gem_object_funcs;
+
+	return 0;
+}
+
+struct drm_gem_object *msm_gem_new(struct drm_device *dev, uint32_t size, uint32_t flags)
+{
+	struct msm_drm_private *priv = dev->dev_private;
+	struct msm_gem_object *msm_obj;
+	struct drm_gem_object *obj = NULL;
+	bool use_vram = false;
+	int ret;
+
+	size = PAGE_ALIGN(size);
+
+	if (!msm_use_mmu(dev))
+		use_vram = true;
+	else if ((flags & (MSM_BO_STOLEN | MSM_BO_SCANOUT)) && priv->vram.size)
+		use_vram = true;
+
+	if (GEM_WARN_ON(use_vram && !priv->vram.size))
+		return ERR_PTR(-EINVAL);
+
+	/* Disallow zero sized objects as they make the underlying
+	 * infrastructure grumpy
+	 */
+	if (size == 0)
+		return ERR_PTR(-EINVAL);
+
+	ret = msm_gem_new_impl(dev, size, flags, &obj);
+	if (ret)
+		return ERR_PTR(ret);
+
+	msm_obj = to_msm_bo(obj);
+
+	if (use_vram) {
+		struct msm_gem_vma *vma;
+		struct page **pages;
+
+		drm_gem_private_object_init(dev, obj, size);
+
+		msm_gem_lock(obj);
+
+		vma = add_vma(obj, NULL);
+		msm_gem_unlock(obj);
+		if (IS_ERR(vma)) {
+			ret = PTR_ERR(vma);
+			goto fail;
+		}
+
+		to_msm_bo(obj)->vram_node = &vma->node;
+
+		msm_gem_lock(obj);
+		pages = get_pages(obj);
+		msm_gem_unlock(obj);
+		if (IS_ERR(pages)) {
+			ret = PTR_ERR(pages);
+			goto fail;
+		}
+
+		vma->iova = physaddr(obj);
+	} else {
+		ret = drm_gem_object_init(dev, obj, size);
+		if (ret)
+			goto fail;
+		/*
+		 * Our buffers are kept pinned, so allocating them from the
+		 * MOVABLE zone is a really bad idea, and conflicts with CMA.
+		 * See comments above new_inode() why this is required _and_
+		 * expected if you're going to pin these pages.
+		 */
+		mapping_set_gfp_mask(obj->filp->f_mapping, GFP_HIGHUSER);
+	}
+
+	drm_gem_lru_move_tail(&priv->lru.unbacked, obj);
+
+	mutex_lock(&priv->obj_lock);
+	list_add_tail(&msm_obj->node, &priv->objects);
+	mutex_unlock(&priv->obj_lock);
+
+	return obj;
+
+fail:
+	drm_gem_object_put(obj);
+	return ERR_PTR(ret);
+}
+
+struct drm_gem_object *msm_gem_import(struct drm_device *dev,
+		struct dma_buf *dmabuf, struct sg_table *sgt)
+{
+	struct msm_drm_private *priv = dev->dev_private;
+	struct msm_gem_object *msm_obj;
+	struct drm_gem_object *obj;
+	uint32_t size;
+	int ret, npages;
+
+	/* if we don't have IOMMU, don't bother pretending we can import: */
+	if (!msm_use_mmu(dev)) {
+		DRM_DEV_ERROR(dev->dev, "cannot import without IOMMU\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	size = PAGE_ALIGN(dmabuf->size);
+
+	ret = msm_gem_new_impl(dev, size, MSM_BO_WC, &obj);
+	if (ret)
+		return ERR_PTR(ret);
+
+	drm_gem_private_object_init(dev, obj, size);
+
+	npages = size / PAGE_SIZE;
+
+	msm_obj = to_msm_bo(obj);
+	msm_gem_lock(obj);
+	msm_obj->sgt = sgt;
+	msm_obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
+	if (!msm_obj->pages) {
+		msm_gem_unlock(obj);
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	ret = drm_prime_sg_to_page_array(sgt, msm_obj->pages, npages);
+	if (ret) {
+		msm_gem_unlock(obj);
+		goto fail;
+	}
+
+	msm_gem_unlock(obj);
+
+	drm_gem_lru_move_tail(&priv->lru.pinned, obj);
+
+	mutex_lock(&priv->obj_lock);
+	list_add_tail(&msm_obj->node, &priv->objects);
+	mutex_unlock(&priv->obj_lock);
+
+	return obj;
+
+fail:
+	drm_gem_object_put(obj);
+	return ERR_PTR(ret);
+}
+
+void *msm_gem_kernel_new(struct drm_device *dev, uint32_t size,
+		uint32_t flags, struct msm_gem_address_space *aspace,
+		struct drm_gem_object **bo, uint64_t *iova)
+{
+	void *vaddr;
+	struct drm_gem_object *obj = msm_gem_new(dev, size, flags);
+	int ret;
+
+	if (IS_ERR(obj))
+		return ERR_CAST(obj);
+
+	if (iova) {
+		ret = msm_gem_get_and_pin_iova(obj, aspace, iova);
+		if (ret)
+			goto err;
+	}
+
+	vaddr = msm_gem_get_vaddr(obj);
+	if (IS_ERR(vaddr)) {
+		msm_gem_unpin_iova(obj, aspace);
+		ret = PTR_ERR(vaddr);
+		goto err;
+	}
+
+	if (bo)
+		*bo = obj;
+
+	return vaddr;
+err:
+	drm_gem_object_put(obj);
+
+	return ERR_PTR(ret);
+
+}
+
+void msm_gem_kernel_put(struct drm_gem_object *bo,
+		struct msm_gem_address_space *aspace)
+{
+	if (IS_ERR_OR_NULL(bo))
+		return;
+
+	msm_gem_put_vaddr(bo);
+	msm_gem_unpin_iova(bo, aspace);
+	drm_gem_object_put(bo);
+}
+
+void msm_gem_object_set_name(struct drm_gem_object *bo, const char *fmt, ...)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(bo);
+	va_list ap;
+
+	if (!fmt)
+		return;
+
+	va_start(ap, fmt);
+	vsnprintf(msm_obj->name, sizeof(msm_obj->name), fmt, ap);
+	va_end(ap);
+}