v4.19.13 snapshot.
diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
new file mode 100644
index 0000000..4f80100
--- /dev/null
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -0,0 +1,667 @@
+/*
+ * NVIDIA Tegra DRM GEM helper functions
+ *
+ * Copyright (C) 2012 Sascha Hauer, Pengutronix
+ * Copyright (C) 2013-2015 NVIDIA CORPORATION, All rights reserved.
+ *
+ * Based on the GEM/CMA helpers
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *
+ * 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.
+ */
+
+#include <linux/dma-buf.h>
+#include <linux/iommu.h>
+#include <drm/tegra_drm.h>
+
+#include "drm.h"
+#include "gem.h"
+
+static void tegra_bo_put(struct host1x_bo *bo)
+{
+ struct tegra_bo *obj = host1x_to_tegra_bo(bo);
+
+ drm_gem_object_put_unlocked(&obj->gem);
+}
+
+static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
+{
+ struct tegra_bo *obj = host1x_to_tegra_bo(bo);
+
+ *sgt = obj->sgt;
+
+ return obj->paddr;
+}
+
+static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
+{
+}
+
+static void *tegra_bo_mmap(struct host1x_bo *bo)
+{
+ struct tegra_bo *obj = host1x_to_tegra_bo(bo);
+
+ if (obj->vaddr)
+ return obj->vaddr;
+ else if (obj->gem.import_attach)
+ return dma_buf_vmap(obj->gem.import_attach->dmabuf);
+ else
+ return vmap(obj->pages, obj->num_pages, VM_MAP,
+ pgprot_writecombine(PAGE_KERNEL));
+}
+
+static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
+{
+ struct tegra_bo *obj = host1x_to_tegra_bo(bo);
+
+ if (obj->vaddr)
+ return;
+ else if (obj->gem.import_attach)
+ dma_buf_vunmap(obj->gem.import_attach->dmabuf, addr);
+ else
+ vunmap(addr);
+}
+
+static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
+{
+ struct tegra_bo *obj = host1x_to_tegra_bo(bo);
+
+ if (obj->vaddr)
+ return obj->vaddr + page * PAGE_SIZE;
+ else if (obj->gem.import_attach)
+ return dma_buf_kmap(obj->gem.import_attach->dmabuf, page);
+ else
+ return vmap(obj->pages + page, 1, VM_MAP,
+ pgprot_writecombine(PAGE_KERNEL));
+}
+
+static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
+ void *addr)
+{
+ struct tegra_bo *obj = host1x_to_tegra_bo(bo);
+
+ if (obj->vaddr)
+ return;
+ else if (obj->gem.import_attach)
+ dma_buf_kunmap(obj->gem.import_attach->dmabuf, page, addr);
+ else
+ vunmap(addr);
+}
+
+static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
+{
+ struct tegra_bo *obj = host1x_to_tegra_bo(bo);
+
+ drm_gem_object_get(&obj->gem);
+
+ return bo;
+}
+
+static const struct host1x_bo_ops tegra_bo_ops = {
+ .get = tegra_bo_get,
+ .put = tegra_bo_put,
+ .pin = tegra_bo_pin,
+ .unpin = tegra_bo_unpin,
+ .mmap = tegra_bo_mmap,
+ .munmap = tegra_bo_munmap,
+ .kmap = tegra_bo_kmap,
+ .kunmap = tegra_bo_kunmap,
+};
+
+static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
+{
+ int prot = IOMMU_READ | IOMMU_WRITE;
+ int err;
+
+ if (bo->mm)
+ return -EBUSY;
+
+ bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
+ if (!bo->mm)
+ return -ENOMEM;
+
+ mutex_lock(&tegra->mm_lock);
+
+ err = drm_mm_insert_node_generic(&tegra->mm,
+ bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
+ if (err < 0) {
+ dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
+ err);
+ goto unlock;
+ }
+
+ bo->paddr = bo->mm->start;
+
+ bo->size = iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl,
+ bo->sgt->nents, prot);
+ if (!bo->size) {
+ dev_err(tegra->drm->dev, "failed to map buffer\n");
+ err = -ENOMEM;
+ goto remove;
+ }
+
+ mutex_unlock(&tegra->mm_lock);
+
+ return 0;
+
+remove:
+ drm_mm_remove_node(bo->mm);
+unlock:
+ mutex_unlock(&tegra->mm_lock);
+ kfree(bo->mm);
+ return err;
+}
+
+static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
+{
+ if (!bo->mm)
+ return 0;
+
+ mutex_lock(&tegra->mm_lock);
+ iommu_unmap(tegra->domain, bo->paddr, bo->size);
+ drm_mm_remove_node(bo->mm);
+ mutex_unlock(&tegra->mm_lock);
+
+ kfree(bo->mm);
+
+ return 0;
+}
+
+static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
+ size_t size)
+{
+ struct tegra_bo *bo;
+ int err;
+
+ bo = kzalloc(sizeof(*bo), GFP_KERNEL);
+ if (!bo)
+ return ERR_PTR(-ENOMEM);
+
+ host1x_bo_init(&bo->base, &tegra_bo_ops);
+ size = round_up(size, PAGE_SIZE);
+
+ err = drm_gem_object_init(drm, &bo->gem, size);
+ if (err < 0)
+ goto free;
+
+ err = drm_gem_create_mmap_offset(&bo->gem);
+ if (err < 0)
+ goto release;
+
+ return bo;
+
+release:
+ drm_gem_object_release(&bo->gem);
+free:
+ kfree(bo);
+ return ERR_PTR(err);
+}
+
+static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
+{
+ if (bo->pages) {
+ dma_unmap_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
+ DMA_BIDIRECTIONAL);
+ drm_gem_put_pages(&bo->gem, bo->pages, true, true);
+ sg_free_table(bo->sgt);
+ kfree(bo->sgt);
+ } else if (bo->vaddr) {
+ dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
+ }
+}
+
+static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
+{
+ int err;
+
+ bo->pages = drm_gem_get_pages(&bo->gem);
+ if (IS_ERR(bo->pages))
+ return PTR_ERR(bo->pages);
+
+ bo->num_pages = bo->gem.size >> PAGE_SHIFT;
+
+ bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
+ if (IS_ERR(bo->sgt)) {
+ err = PTR_ERR(bo->sgt);
+ goto put_pages;
+ }
+
+ err = dma_map_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
+ DMA_BIDIRECTIONAL);
+ if (err == 0) {
+ err = -EFAULT;
+ goto free_sgt;
+ }
+
+ return 0;
+
+free_sgt:
+ sg_free_table(bo->sgt);
+ kfree(bo->sgt);
+put_pages:
+ drm_gem_put_pages(&bo->gem, bo->pages, false, false);
+ return err;
+}
+
+static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
+{
+ struct tegra_drm *tegra = drm->dev_private;
+ int err;
+
+ if (tegra->domain) {
+ err = tegra_bo_get_pages(drm, bo);
+ if (err < 0)
+ return err;
+
+ err = tegra_bo_iommu_map(tegra, bo);
+ if (err < 0) {
+ tegra_bo_free(drm, bo);
+ return err;
+ }
+ } else {
+ size_t size = bo->gem.size;
+
+ bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->paddr,
+ GFP_KERNEL | __GFP_NOWARN);
+ if (!bo->vaddr) {
+ dev_err(drm->dev,
+ "failed to allocate buffer of size %zu\n",
+ size);
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
+struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
+ unsigned long flags)
+{
+ struct tegra_bo *bo;
+ int err;
+
+ bo = tegra_bo_alloc_object(drm, size);
+ if (IS_ERR(bo))
+ return bo;
+
+ err = tegra_bo_alloc(drm, bo);
+ if (err < 0)
+ goto release;
+
+ if (flags & DRM_TEGRA_GEM_CREATE_TILED)
+ bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
+
+ if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
+ bo->flags |= TEGRA_BO_BOTTOM_UP;
+
+ return bo;
+
+release:
+ drm_gem_object_release(&bo->gem);
+ kfree(bo);
+ return ERR_PTR(err);
+}
+
+struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
+ struct drm_device *drm,
+ size_t size,
+ unsigned long flags,
+ u32 *handle)
+{
+ struct tegra_bo *bo;
+ int err;
+
+ bo = tegra_bo_create(drm, size, flags);
+ if (IS_ERR(bo))
+ return bo;
+
+ err = drm_gem_handle_create(file, &bo->gem, handle);
+ if (err) {
+ tegra_bo_free_object(&bo->gem);
+ return ERR_PTR(err);
+ }
+
+ drm_gem_object_put_unlocked(&bo->gem);
+
+ return bo;
+}
+
+static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
+ struct dma_buf *buf)
+{
+ struct tegra_drm *tegra = drm->dev_private;
+ struct dma_buf_attachment *attach;
+ struct tegra_bo *bo;
+ int err;
+
+ bo = tegra_bo_alloc_object(drm, buf->size);
+ if (IS_ERR(bo))
+ return bo;
+
+ attach = dma_buf_attach(buf, drm->dev);
+ if (IS_ERR(attach)) {
+ err = PTR_ERR(attach);
+ goto free;
+ }
+
+ get_dma_buf(buf);
+
+ bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
+ if (IS_ERR(bo->sgt)) {
+ err = PTR_ERR(bo->sgt);
+ goto detach;
+ }
+
+ if (tegra->domain) {
+ err = tegra_bo_iommu_map(tegra, bo);
+ if (err < 0)
+ goto detach;
+ } else {
+ if (bo->sgt->nents > 1) {
+ err = -EINVAL;
+ goto detach;
+ }
+
+ bo->paddr = sg_dma_address(bo->sgt->sgl);
+ }
+
+ bo->gem.import_attach = attach;
+
+ return bo;
+
+detach:
+ if (!IS_ERR_OR_NULL(bo->sgt))
+ dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
+
+ dma_buf_detach(buf, attach);
+ dma_buf_put(buf);
+free:
+ drm_gem_object_release(&bo->gem);
+ kfree(bo);
+ return ERR_PTR(err);
+}
+
+void tegra_bo_free_object(struct drm_gem_object *gem)
+{
+ struct tegra_drm *tegra = gem->dev->dev_private;
+ struct tegra_bo *bo = to_tegra_bo(gem);
+
+ if (tegra->domain)
+ tegra_bo_iommu_unmap(tegra, bo);
+
+ if (gem->import_attach) {
+ dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
+ DMA_TO_DEVICE);
+ drm_prime_gem_destroy(gem, NULL);
+ } else {
+ tegra_bo_free(gem->dev, bo);
+ }
+
+ drm_gem_object_release(gem);
+ kfree(bo);
+}
+
+int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
+ struct drm_mode_create_dumb *args)
+{
+ unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
+ struct tegra_drm *tegra = drm->dev_private;
+ struct tegra_bo *bo;
+
+ args->pitch = round_up(min_pitch, tegra->pitch_align);
+ args->size = args->pitch * args->height;
+
+ bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
+ &args->handle);
+ if (IS_ERR(bo))
+ return PTR_ERR(bo);
+
+ return 0;
+}
+
+static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ struct drm_gem_object *gem = vma->vm_private_data;
+ struct tegra_bo *bo = to_tegra_bo(gem);
+ struct page *page;
+ pgoff_t offset;
+
+ if (!bo->pages)
+ return VM_FAULT_SIGBUS;
+
+ offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
+ page = bo->pages[offset];
+
+ return vmf_insert_page(vma, vmf->address, page);
+}
+
+const struct vm_operations_struct tegra_bo_vm_ops = {
+ .fault = tegra_bo_fault,
+ .open = drm_gem_vm_open,
+ .close = drm_gem_vm_close,
+};
+
+int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
+{
+ struct tegra_bo *bo = to_tegra_bo(gem);
+
+ if (!bo->pages) {
+ unsigned long vm_pgoff = vma->vm_pgoff;
+ int err;
+
+ /*
+ * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
+ * and set the vm_pgoff (used as a fake buffer offset by DRM)
+ * to 0 as we want to map the whole buffer.
+ */
+ vma->vm_flags &= ~VM_PFNMAP;
+ vma->vm_pgoff = 0;
+
+ err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->paddr,
+ gem->size);
+ if (err < 0) {
+ drm_gem_vm_close(vma);
+ return err;
+ }
+
+ vma->vm_pgoff = vm_pgoff;
+ } else {
+ pgprot_t prot = vm_get_page_prot(vma->vm_flags);
+
+ vma->vm_flags |= VM_MIXEDMAP;
+ vma->vm_flags &= ~VM_PFNMAP;
+
+ vma->vm_page_prot = pgprot_writecombine(prot);
+ }
+
+ return 0;
+}
+
+int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct drm_gem_object *gem;
+ int err;
+
+ err = drm_gem_mmap(file, vma);
+ if (err < 0)
+ return err;
+
+ gem = vma->vm_private_data;
+
+ return __tegra_gem_mmap(gem, vma);
+}
+
+static struct sg_table *
+tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
+ enum dma_data_direction dir)
+{
+ struct drm_gem_object *gem = attach->dmabuf->priv;
+ struct tegra_bo *bo = to_tegra_bo(gem);
+ struct sg_table *sgt;
+
+ sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
+ if (!sgt)
+ return NULL;
+
+ if (bo->pages) {
+ struct scatterlist *sg;
+ unsigned int i;
+
+ if (sg_alloc_table(sgt, bo->num_pages, GFP_KERNEL))
+ goto free;
+
+ for_each_sg(sgt->sgl, sg, bo->num_pages, i)
+ sg_set_page(sg, bo->pages[i], PAGE_SIZE, 0);
+
+ if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
+ goto free;
+ } else {
+ if (sg_alloc_table(sgt, 1, GFP_KERNEL))
+ goto free;
+
+ sg_dma_address(sgt->sgl) = bo->paddr;
+ sg_dma_len(sgt->sgl) = gem->size;
+ }
+
+ return sgt;
+
+free:
+ sg_free_table(sgt);
+ kfree(sgt);
+ return NULL;
+}
+
+static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
+ struct sg_table *sgt,
+ enum dma_data_direction dir)
+{
+ struct drm_gem_object *gem = attach->dmabuf->priv;
+ struct tegra_bo *bo = to_tegra_bo(gem);
+
+ if (bo->pages)
+ dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
+
+ sg_free_table(sgt);
+ kfree(sgt);
+}
+
+static void tegra_gem_prime_release(struct dma_buf *buf)
+{
+ drm_gem_dmabuf_release(buf);
+}
+
+static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
+ enum dma_data_direction direction)
+{
+ struct drm_gem_object *gem = buf->priv;
+ struct tegra_bo *bo = to_tegra_bo(gem);
+ struct drm_device *drm = gem->dev;
+
+ if (bo->pages)
+ dma_sync_sg_for_cpu(drm->dev, bo->sgt->sgl, bo->sgt->nents,
+ DMA_FROM_DEVICE);
+
+ return 0;
+}
+
+static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
+ enum dma_data_direction direction)
+{
+ struct drm_gem_object *gem = buf->priv;
+ struct tegra_bo *bo = to_tegra_bo(gem);
+ struct drm_device *drm = gem->dev;
+
+ if (bo->pages)
+ dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
+ DMA_TO_DEVICE);
+
+ return 0;
+}
+
+static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
+{
+ return NULL;
+}
+
+static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
+ void *addr)
+{
+}
+
+static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
+{
+ struct drm_gem_object *gem = buf->priv;
+ int err;
+
+ err = drm_gem_mmap_obj(gem, gem->size, vma);
+ if (err < 0)
+ return err;
+
+ return __tegra_gem_mmap(gem, vma);
+}
+
+static void *tegra_gem_prime_vmap(struct dma_buf *buf)
+{
+ struct drm_gem_object *gem = buf->priv;
+ struct tegra_bo *bo = to_tegra_bo(gem);
+
+ return bo->vaddr;
+}
+
+static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
+{
+}
+
+static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
+ .map_dma_buf = tegra_gem_prime_map_dma_buf,
+ .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
+ .release = tegra_gem_prime_release,
+ .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
+ .end_cpu_access = tegra_gem_prime_end_cpu_access,
+ .map = tegra_gem_prime_kmap,
+ .unmap = tegra_gem_prime_kunmap,
+ .mmap = tegra_gem_prime_mmap,
+ .vmap = tegra_gem_prime_vmap,
+ .vunmap = tegra_gem_prime_vunmap,
+};
+
+struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
+ struct drm_gem_object *gem,
+ int flags)
+{
+ DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
+
+ exp_info.exp_name = KBUILD_MODNAME;
+ exp_info.owner = drm->driver->fops->owner;
+ exp_info.ops = &tegra_gem_prime_dmabuf_ops;
+ exp_info.size = gem->size;
+ exp_info.flags = flags;
+ exp_info.priv = gem;
+
+ return drm_gem_dmabuf_export(drm, &exp_info);
+}
+
+struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
+ struct dma_buf *buf)
+{
+ struct tegra_bo *bo;
+
+ if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
+ struct drm_gem_object *gem = buf->priv;
+
+ if (gem->dev == drm) {
+ drm_gem_object_get(gem);
+ return gem;
+ }
+ }
+
+ bo = tegra_bo_import(drm, buf);
+ if (IS_ERR(bo))
+ return ERR_CAST(bo);
+
+ return &bo->gem;
+}