[PATCH v2 06/14] drm/etnaviv: add GEM core functionality
Lucas Stach
l.stach at pengutronix.de
Wed Dec 9 03:48:19 PST 2015
From: The etnaviv authors <dri-devel at lists.freedesktop.org>
This adds the implementation for the GEM core functionality
for the etnaviv DRM driver.
Signed-off-by: Christian Gmeiner <christian.gmeiner at gmail.com>
Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk>
Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
---
drivers/gpu/drm/etnaviv/etnaviv_gem.c | 897 ++++++++++++++++++++++++++++
drivers/gpu/drm/etnaviv/etnaviv_gem.h | 117 ++++
drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c | 122 ++++
3 files changed, 1136 insertions(+)
create mode 100644 drivers/gpu/drm/etnaviv/etnaviv_gem.c
create mode 100644 drivers/gpu/drm/etnaviv/etnaviv_gem.h
create mode 100644 drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
new file mode 100644
index 000000000000..8d6f859f8200
--- /dev/null
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -0,0 +1,897 @@
+/*
+ * Copyright (C) 2015 Etnaviv Project
+ *
+ * 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 <linux/spinlock.h>
+#include <linux/shmem_fs.h>
+
+#include "etnaviv_drv.h"
+#include "etnaviv_gem.h"
+#include "etnaviv_gpu.h"
+#include "etnaviv_mmu.h"
+
+static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj)
+{
+ struct drm_device *dev = etnaviv_obj->base.dev;
+ struct sg_table *sgt = etnaviv_obj->sgt;
+
+ /*
+ * For non-cached buffers, ensure the new pages are clean
+ * because display controller, GPU, etc. are not coherent.
+ */
+ if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
+ dma_map_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
+}
+
+static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj)
+{
+ struct drm_device *dev = etnaviv_obj->base.dev;
+ struct sg_table *sgt = etnaviv_obj->sgt;
+
+ /*
+ * For non-cached buffers, ensure the new pages are clean
+ * because display controller, GPU, etc. are not coherent:
+ *
+ * WARNING: The DMA API does not support concurrent CPU
+ * and device access to the memory area. With BIDIRECTIONAL,
+ * we will clean the cache lines which overlap the region,
+ * and invalidate all cache lines (partially) contained in
+ * the region.
+ *
+ * If you have dirty data in the overlapping cache lines,
+ * that will corrupt the GPU-written data. If you have
+ * written into the remainder of the region, this can
+ * discard those writes.
+ */
+ if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
+ dma_unmap_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
+}
+
+/* called with etnaviv_obj->lock held */
+static int etnaviv_gem_shmem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
+{
+ struct drm_device *dev = etnaviv_obj->base.dev;
+ struct page **p = drm_gem_get_pages(&etnaviv_obj->base);
+
+ if (IS_ERR(p)) {
+ dev_err(dev->dev, "could not get pages: %ld\n", PTR_ERR(p));
+ return PTR_ERR(p);
+ }
+
+ etnaviv_obj->pages = p;
+
+ return 0;
+}
+
+static void put_pages(struct etnaviv_gem_object *etnaviv_obj)
+{
+ if (etnaviv_obj->sgt) {
+ etnaviv_gem_scatterlist_unmap(etnaviv_obj);
+ sg_free_table(etnaviv_obj->sgt);
+ kfree(etnaviv_obj->sgt);
+ etnaviv_obj->sgt = NULL;
+ }
+ if (etnaviv_obj->pages) {
+ drm_gem_put_pages(&etnaviv_obj->base, etnaviv_obj->pages,
+ true, false);
+
+ etnaviv_obj->pages = NULL;
+ }
+}
+
+struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
+{
+ int ret;
+
+ lockdep_assert_held(&etnaviv_obj->lock);
+
+ if (!etnaviv_obj->pages) {
+ ret = etnaviv_obj->ops->get_pages(etnaviv_obj);
+ if (ret < 0)
+ return ERR_PTR(ret);
+ }
+
+ if (!etnaviv_obj->sgt) {
+ struct drm_device *dev = etnaviv_obj->base.dev;
+ int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
+ struct sg_table *sgt;
+
+ sgt = drm_prime_pages_to_sg(etnaviv_obj->pages, npages);
+ if (IS_ERR(sgt)) {
+ dev_err(dev->dev, "failed to allocate sgt: %ld\n",
+ PTR_ERR(sgt));
+ return ERR_CAST(sgt);
+ }
+
+ etnaviv_obj->sgt = sgt;
+
+ etnaviv_gem_scatter_map(etnaviv_obj);
+ }
+
+ return etnaviv_obj->pages;
+}
+
+void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj)
+{
+ lockdep_assert_held(&etnaviv_obj->lock);
+ /* when we start tracking the pin count, then do something here */
+}
+
+static int etnaviv_gem_mmap_obj(struct drm_gem_object *obj,
+ struct vm_area_struct *vma)
+{
+ struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
+ pgprot_t vm_page_prot;
+
+ vma->vm_flags &= ~VM_PFNMAP;
+ vma->vm_flags |= VM_MIXEDMAP;
+
+ vm_page_prot = vm_get_page_prot(vma->vm_flags);
+
+ if (etnaviv_obj->flags & ETNA_BO_WC) {
+ vma->vm_page_prot = pgprot_writecombine(vm_page_prot);
+ } else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) {
+ vma->vm_page_prot = pgprot_noncached(vm_page_prot);
+ } else {
+ /*
+ * Shunt off cached objs to shmem file so they have their own
+ * address_space (so unmap_mapping_range does what we want,
+ * in particular in the case of mmap'd dmabufs)
+ */
+ fput(vma->vm_file);
+ get_file(obj->filp);
+ vma->vm_pgoff = 0;
+ vma->vm_file = obj->filp;
+
+ vma->vm_page_prot = vm_page_prot;
+ }
+
+ return 0;
+}
+
+int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ struct etnaviv_gem_object *obj;
+ int ret;
+
+ ret = drm_gem_mmap(filp, vma);
+ if (ret) {
+ DBG("mmap failed: %d", ret);
+ return ret;
+ }
+
+ obj = to_etnaviv_bo(vma->vm_private_data);
+ return etnaviv_gem_mmap_obj(vma->vm_private_data, vma);
+}
+
+int etnaviv_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct drm_gem_object *obj = vma->vm_private_data;
+ struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
+ struct page **pages, *page;
+ pgoff_t pgoff;
+ int ret;
+
+ /*
+ * Make sure we don't parallel update on a fault, nor move or remove
+ * something from beneath our feet. Note that vm_insert_page() is
+ * specifically coded to take care of this, so we don't have to.
+ */
+ ret = mutex_lock_interruptible(&etnaviv_obj->lock);
+ if (ret)
+ goto out;
+
+ /* make sure we have pages attached now */
+ pages = etnaviv_gem_get_pages(etnaviv_obj);
+ mutex_unlock(&etnaviv_obj->lock);
+
+ if (IS_ERR(pages)) {
+ ret = PTR_ERR(pages);
+ goto out;
+ }
+
+ /* We don't use vmf->pgoff since that has the fake offset: */
+ pgoff = ((unsigned long)vmf->virtual_address -
+ vma->vm_start) >> PAGE_SHIFT;
+
+ page = pages[pgoff];
+
+ VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
+ page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT);
+
+ ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page);
+
+out:
+ switch (ret) {
+ case -EAGAIN:
+ case 0:
+ case -ERESTARTSYS:
+ case -EINTR:
+ case -EBUSY:
+ /*
+ * EBUSY is ok: this just means that another thread
+ * already did the job.
+ */
+ return VM_FAULT_NOPAGE;
+ case -ENOMEM:
+ return VM_FAULT_OOM;
+ default:
+ return VM_FAULT_SIGBUS;
+ }
+}
+
+int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)
+{
+ int ret;
+
+ /* Make it mmapable */
+ ret = drm_gem_create_mmap_offset(obj);
+ if (ret)
+ dev_err(obj->dev->dev, "could not allocate mmap offset\n");
+ else
+ *offset = drm_vma_node_offset_addr(&obj->vma_node);
+
+ return ret;
+}
+
+static struct etnaviv_vram_mapping *
+etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj,
+ struct etnaviv_iommu *mmu)
+{
+ struct etnaviv_vram_mapping *mapping;
+
+ list_for_each_entry(mapping, &obj->vram_list, obj_node) {
+ if (mapping->mmu == mmu)
+ return mapping;
+ }
+
+ return NULL;
+}
+
+int etnaviv_gem_get_iova(struct etnaviv_gpu *gpu,
+ struct drm_gem_object *obj, u32 *iova)
+{
+ struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
+ struct etnaviv_vram_mapping *mapping;
+ struct page **pages;
+ int ret = 0;
+
+ mutex_lock(&etnaviv_obj->lock);
+ mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, gpu->mmu);
+ if (mapping) {
+ /*
+ * Holding the object lock prevents the use count changing
+ * beneath us. If the use count is zero, the MMU might be
+ * reaping this object, so take the lock and re-check that
+ * the MMU owns this mapping to close this race.
+ */
+ if (mapping->use == 0) {
+ mutex_lock(&gpu->mmu->lock);
+ if (mapping->mmu == gpu->mmu)
+ mapping->use += 1;
+ else
+ mapping = NULL;
+ mutex_unlock(&gpu->mmu->lock);
+ if (mapping)
+ goto out;
+ } else {
+ mapping->use += 1;
+ goto out;
+ }
+ }
+
+ pages = etnaviv_gem_get_pages(etnaviv_obj);
+ if (IS_ERR(pages)) {
+ ret = PTR_ERR(pages);
+ goto out;
+ }
+
+ /*
+ * See if we have a reaped vram mapping we can re-use before
+ * allocating a fresh mapping.
+ */
+ mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
+ if (!mapping) {
+ mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
+ if (!mapping)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&mapping->scan_node);
+ mapping->object = etnaviv_obj;
+ } else {
+ list_del(&mapping->obj_node);
+ }
+
+ mapping->mmu = gpu->mmu;
+ mapping->use = 1;
+
+ ret = etnaviv_iommu_map_gem(gpu->mmu, etnaviv_obj, gpu->memory_base,
+ mapping);
+ if (ret < 0)
+ kfree(mapping);
+ else
+ list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
+
+out:
+ mutex_unlock(&etnaviv_obj->lock);
+
+ if (!ret) {
+ /* Take a reference on the object */
+ drm_gem_object_reference(obj);
+ *iova = mapping->iova;
+ }
+
+ return ret;
+}
+
+void etnaviv_gem_put_iova(struct etnaviv_gpu *gpu, struct drm_gem_object *obj)
+{
+ struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
+ struct etnaviv_vram_mapping *mapping;
+
+ mutex_lock(&etnaviv_obj->lock);
+ mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, gpu->mmu);
+
+ WARN_ON(mapping->use == 0);
+ mapping->use -= 1;
+ mutex_unlock(&etnaviv_obj->lock);
+
+ drm_gem_object_unreference_unlocked(obj);
+}
+
+void *etnaviv_gem_vaddr(struct drm_gem_object *obj)
+{
+ struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
+
+ mutex_lock(&etnaviv_obj->lock);
+ if (!etnaviv_obj->vaddr) {
+ struct page **pages = etnaviv_gem_get_pages(etnaviv_obj);
+
+ if (IS_ERR(pages))
+ return ERR_CAST(pages);
+
+ etnaviv_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
+ VM_MAP, pgprot_writecombine(PAGE_KERNEL));
+ }
+ mutex_unlock(&etnaviv_obj->lock);
+
+ return etnaviv_obj->vaddr;
+}
+
+static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
+{
+ if (op & ETNA_PREP_READ)
+ return DMA_FROM_DEVICE;
+ else if (op & ETNA_PREP_WRITE)
+ return DMA_TO_DEVICE;
+ else
+ return DMA_BIDIRECTIONAL;
+}
+
+int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
+ struct timespec *timeout)
+{
+ struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
+ struct drm_device *dev = obj->dev;
+ bool write = !!(op & ETNA_PREP_WRITE);
+ int ret;
+
+ if (op & ETNA_PREP_NOSYNC) {
+ if (!reservation_object_test_signaled_rcu(etnaviv_obj->resv,
+ write))
+ return -EBUSY;
+ } else {
+ unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
+
+ ret = reservation_object_wait_timeout_rcu(etnaviv_obj->resv,
+ write, true, remain);
+ if (ret <= 0)
+ return ret == 0 ? -ETIMEDOUT : ret;
+ }
+
+ if (etnaviv_obj->flags & ETNA_BO_CACHED) {
+ if (!etnaviv_obj->sgt) {
+ void *ret;
+
+ mutex_lock(&etnaviv_obj->lock);
+ ret = etnaviv_gem_get_pages(etnaviv_obj);
+ mutex_unlock(&etnaviv_obj->lock);
+ if (IS_ERR(ret))
+ return PTR_ERR(ret);
+ }
+
+ dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl,
+ etnaviv_obj->sgt->nents,
+ etnaviv_op_to_dma_dir(op));
+ etnaviv_obj->last_cpu_prep_op = op;
+ }
+
+ return 0;
+}
+
+int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
+{
+ struct drm_device *dev = obj->dev;
+ struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
+
+ if (etnaviv_obj->flags & ETNA_BO_CACHED) {
+ /* fini without a prep is almost certainly a userspace error */
+ WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
+ dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl,
+ etnaviv_obj->sgt->nents,
+ etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
+ etnaviv_obj->last_cpu_prep_op = 0;
+ }
+
+ return 0;
+}
+
+int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
+ struct timespec *timeout)
+{
+ struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
+
+ return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void etnaviv_gem_describe_fence(struct fence *fence,
+ const char *type, struct seq_file *m)
+{
+ if (!test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->flags))
+ seq_printf(m, "\t%9s: %s %s seq %u\n",
+ type,
+ fence->ops->get_driver_name(fence),
+ fence->ops->get_timeline_name(fence),
+ fence->seqno);
+}
+
+static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
+{
+ struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
+ struct reservation_object *robj = etnaviv_obj->resv;
+ struct reservation_object_list *fobj;
+ struct fence *fence;
+ unsigned long off = drm_vma_node_start(&obj->vma_node);
+
+ seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
+ etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
+ obj->name, obj->refcount.refcount.counter,
+ off, etnaviv_obj->vaddr, obj->size);
+
+ rcu_read_lock();
+ fobj = rcu_dereference(robj->fence);
+ if (fobj) {
+ unsigned int i, shared_count = fobj->shared_count;
+
+ for (i = 0; i < shared_count; i++) {
+ fence = rcu_dereference(fobj->shared[i]);
+ etnaviv_gem_describe_fence(fence, "Shared", m);
+ }
+ }
+
+ fence = rcu_dereference(robj->fence_excl);
+ if (fence)
+ etnaviv_gem_describe_fence(fence, "Exclusive", m);
+ rcu_read_unlock();
+}
+
+void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
+ struct seq_file *m)
+{
+ struct etnaviv_gem_object *etnaviv_obj;
+ int count = 0;
+ size_t size = 0;
+
+ mutex_lock(&priv->gem_lock);
+ list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
+ struct drm_gem_object *obj = &etnaviv_obj->base;
+
+ seq_puts(m, " ");
+ etnaviv_gem_describe(obj, m);
+ count++;
+ size += obj->size;
+ }
+ mutex_unlock(&priv->gem_lock);
+
+ seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
+}
+#endif
+
+static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
+{
+ if (etnaviv_obj->vaddr)
+ vunmap(etnaviv_obj->vaddr);
+ put_pages(etnaviv_obj);
+}
+
+static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
+ .get_pages = etnaviv_gem_shmem_get_pages,
+ .release = etnaviv_gem_shmem_release,
+};
+
+void etnaviv_gem_free_object(struct drm_gem_object *obj)
+{
+ struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
+ struct etnaviv_vram_mapping *mapping, *tmp;
+
+ /* object should not be active */
+ WARN_ON(is_active(etnaviv_obj));
+
+ list_del(&etnaviv_obj->gem_node);
+
+ list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
+ obj_node) {
+ struct etnaviv_iommu *mmu = mapping->mmu;
+
+ WARN_ON(mapping->use);
+
+ if (mmu)
+ etnaviv_iommu_unmap_gem(mmu, mapping);
+
+ list_del(&mapping->obj_node);
+ kfree(mapping);
+ }
+
+ drm_gem_free_mmap_offset(obj);
+ etnaviv_obj->ops->release(etnaviv_obj);
+ if (etnaviv_obj->resv == &etnaviv_obj->_resv)
+ reservation_object_fini(&etnaviv_obj->_resv);
+ drm_gem_object_release(obj);
+
+ kfree(etnaviv_obj);
+}
+
+int etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
+{
+ struct etnaviv_drm_private *priv = dev->dev_private;
+ struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
+
+ mutex_lock(&priv->gem_lock);
+ list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
+ mutex_unlock(&priv->gem_lock);
+
+ return 0;
+}
+
+static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
+ struct reservation_object *robj, const struct etnaviv_gem_ops *ops,
+ struct drm_gem_object **obj)
+{
+ struct etnaviv_gem_object *etnaviv_obj;
+ unsigned sz = sizeof(*etnaviv_obj);
+ bool valid = true;
+
+ /* validate flags */
+ switch (flags & ETNA_BO_CACHE_MASK) {
+ case ETNA_BO_UNCACHED:
+ case ETNA_BO_CACHED:
+ case ETNA_BO_WC:
+ break;
+ default:
+ valid = false;
+ }
+
+ if (!valid) {
+ dev_err(dev->dev, "invalid cache flag: %x\n",
+ (flags & ETNA_BO_CACHE_MASK));
+ return -EINVAL;
+ }
+
+ etnaviv_obj = kzalloc(sz, GFP_KERNEL);
+ if (!etnaviv_obj)
+ return -ENOMEM;
+
+ etnaviv_obj->flags = flags;
+ etnaviv_obj->ops = ops;
+ if (robj) {
+ etnaviv_obj->resv = robj;
+ } else {
+ etnaviv_obj->resv = &etnaviv_obj->_resv;
+ reservation_object_init(&etnaviv_obj->_resv);
+ }
+
+ mutex_init(&etnaviv_obj->lock);
+ INIT_LIST_HEAD(&etnaviv_obj->vram_list);
+
+ *obj = &etnaviv_obj->base;
+
+ return 0;
+}
+
+static struct drm_gem_object *__etnaviv_gem_new(struct drm_device *dev,
+ u32 size, u32 flags)
+{
+ struct drm_gem_object *obj = NULL;
+ int ret;
+
+ size = PAGE_ALIGN(size);
+
+ ret = etnaviv_gem_new_impl(dev, size, flags, NULL,
+ &etnaviv_gem_shmem_ops, &obj);
+ if (ret)
+ goto fail;
+
+ ret = drm_gem_object_init(dev, obj, size);
+ if (ret == 0) {
+ struct address_space *mapping;
+
+ /*
+ * Our buffers are kept pinned, so allocating them
+ * from the MOVABLE zone is a really bad idea, and
+ * conflicts with CMA. See coments above new_inode()
+ * why this is required _and_ expected if you're
+ * going to pin these pages.
+ */
+ mapping = file_inode(obj->filp)->i_mapping;
+ mapping_set_gfp_mask(mapping, GFP_HIGHUSER);
+ }
+
+ if (ret)
+ goto fail;
+
+ return obj;
+
+fail:
+ if (obj)
+ drm_gem_object_unreference_unlocked(obj);
+
+ return ERR_PTR(ret);
+}
+
+/* convenience method to construct a GEM buffer object, and userspace handle */
+int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
+ u32 size, u32 flags, u32 *handle)
+{
+ struct drm_gem_object *obj;
+ int ret;
+
+ obj = __etnaviv_gem_new(dev, size, flags);
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
+
+ ret = etnaviv_gem_obj_add(dev, obj);
+ if (ret < 0) {
+ drm_gem_object_unreference_unlocked(obj);
+ return ret;
+ }
+
+ ret = drm_gem_handle_create(file, obj, handle);
+
+ /* drop reference from allocate - handle holds it now */
+ drm_gem_object_unreference_unlocked(obj);
+
+ return ret;
+}
+
+struct drm_gem_object *etnaviv_gem_new(struct drm_device *dev,
+ u32 size, u32 flags)
+{
+ struct drm_gem_object *obj;
+ int ret;
+
+ obj = __etnaviv_gem_new(dev, size, flags);
+ if (IS_ERR(obj))
+ return obj;
+
+ ret = etnaviv_gem_obj_add(dev, obj);
+ if (ret < 0) {
+ drm_gem_object_unreference_unlocked(obj);
+ return ERR_PTR(ret);
+ }
+
+ return obj;
+}
+
+int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
+ struct reservation_object *robj, const struct etnaviv_gem_ops *ops,
+ struct etnaviv_gem_object **res)
+{
+ struct drm_gem_object *obj;
+ int ret;
+
+ ret = etnaviv_gem_new_impl(dev, size, flags, robj, ops, &obj);
+ if (ret)
+ return ret;
+
+ drm_gem_private_object_init(dev, obj, size);
+
+ *res = to_etnaviv_bo(obj);
+
+ return 0;
+}
+
+struct get_pages_work {
+ struct work_struct work;
+ struct mm_struct *mm;
+ struct task_struct *task;
+ struct etnaviv_gem_object *etnaviv_obj;
+};
+
+static struct page **etnaviv_gem_userptr_do_get_pages(
+ struct etnaviv_gem_object *etnaviv_obj, struct mm_struct *mm, struct task_struct *task)
+{
+ int ret = 0, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
+ struct page **pvec;
+ uintptr_t ptr;
+
+ pvec = drm_malloc_ab(npages, sizeof(struct page *));
+ if (!pvec)
+ return ERR_PTR(-ENOMEM);
+
+ pinned = 0;
+ ptr = etnaviv_obj->userptr.ptr;
+
+ down_read(&mm->mmap_sem);
+ while (pinned < npages) {
+ ret = get_user_pages(task, mm, ptr, npages - pinned,
+ !etnaviv_obj->userptr.ro, 0,
+ pvec + pinned, NULL);
+ if (ret < 0)
+ break;
+
+ ptr += ret * PAGE_SIZE;
+ pinned += ret;
+ }
+ up_read(&mm->mmap_sem);
+
+ if (ret < 0) {
+ release_pages(pvec, pinned, 0);
+ drm_free_large(pvec);
+ return ERR_PTR(ret);
+ }
+
+ return pvec;
+}
+
+static void __etnaviv_gem_userptr_get_pages(struct work_struct *_work)
+{
+ struct get_pages_work *work = container_of(_work, typeof(*work), work);
+ struct etnaviv_gem_object *etnaviv_obj = work->etnaviv_obj;
+ struct page **pvec;
+
+ pvec = etnaviv_gem_userptr_do_get_pages(etnaviv_obj, work->mm, work->task);
+
+ mutex_lock(&etnaviv_obj->lock);
+ if (IS_ERR(pvec)) {
+ etnaviv_obj->userptr.work = ERR_CAST(pvec);
+ } else {
+ etnaviv_obj->userptr.work = NULL;
+ etnaviv_obj->pages = pvec;
+ }
+
+ mutex_unlock(&etnaviv_obj->lock);
+ drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
+
+ mmput(work->mm);
+ put_task_struct(work->task);
+ kfree(work);
+}
+
+static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
+{
+ struct page **pvec = NULL;
+ struct get_pages_work *work;
+ struct mm_struct *mm;
+ int ret, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
+
+ if (etnaviv_obj->userptr.work) {
+ if (IS_ERR(etnaviv_obj->userptr.work)) {
+ ret = PTR_ERR(etnaviv_obj->userptr.work);
+ etnaviv_obj->userptr.work = NULL;
+ } else {
+ ret = -EAGAIN;
+ }
+ return ret;
+ }
+
+ mm = get_task_mm(etnaviv_obj->userptr.task);
+ pinned = 0;
+ if (mm == current->mm) {
+ pvec = drm_malloc_ab(npages, sizeof(struct page *));
+ if (!pvec) {
+ mmput(mm);
+ return -ENOMEM;
+ }
+
+ pinned = __get_user_pages_fast(etnaviv_obj->userptr.ptr, npages,
+ !etnaviv_obj->userptr.ro, pvec);
+ if (pinned < 0) {
+ drm_free_large(pvec);
+ mmput(mm);
+ return pinned;
+ }
+
+ if (pinned == npages) {
+ etnaviv_obj->pages = pvec;
+ mmput(mm);
+ return 0;
+ }
+ }
+
+ release_pages(pvec, pinned, 0);
+ drm_free_large(pvec);
+
+ work = kmalloc(sizeof(*work), GFP_KERNEL);
+ if (!work) {
+ mmput(mm);
+ return -ENOMEM;
+ }
+
+ get_task_struct(current);
+ drm_gem_object_reference(&etnaviv_obj->base);
+
+ work->mm = mm;
+ work->task = current;
+ work->etnaviv_obj = etnaviv_obj;
+
+ etnaviv_obj->userptr.work = &work->work;
+ INIT_WORK(&work->work, __etnaviv_gem_userptr_get_pages);
+
+ etnaviv_queue_work(etnaviv_obj->base.dev, &work->work);
+
+ return -EAGAIN;
+}
+
+static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
+{
+ if (etnaviv_obj->sgt) {
+ etnaviv_gem_scatterlist_unmap(etnaviv_obj);
+ sg_free_table(etnaviv_obj->sgt);
+ kfree(etnaviv_obj->sgt);
+ }
+ if (etnaviv_obj->pages) {
+ int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
+
+ release_pages(etnaviv_obj->pages, npages, 0);
+ drm_free_large(etnaviv_obj->pages);
+ }
+ put_task_struct(etnaviv_obj->userptr.task);
+}
+
+static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
+ .get_pages = etnaviv_gem_userptr_get_pages,
+ .release = etnaviv_gem_userptr_release,
+};
+
+int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
+ uintptr_t ptr, u32 size, u32 flags, u32 *handle)
+{
+ struct etnaviv_gem_object *etnaviv_obj;
+ int ret;
+
+ ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED, NULL,
+ &etnaviv_gem_userptr_ops, &etnaviv_obj);
+ if (ret)
+ return ret;
+
+ etnaviv_obj->userptr.ptr = ptr;
+ etnaviv_obj->userptr.task = current;
+ etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
+ get_task_struct(current);
+
+ ret = etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
+ if (ret) {
+ drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
+ return ret;
+ }
+
+ ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
+
+ /* drop reference from allocate - handle holds it now */
+ drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
+
+ return ret;
+}
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.h b/drivers/gpu/drm/etnaviv/etnaviv_gem.h
new file mode 100644
index 000000000000..a300b4b3d545
--- /dev/null
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.h
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2015 Etnaviv Project
+ *
+ * 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/>.
+ */
+
+#ifndef __ETNAVIV_GEM_H__
+#define __ETNAVIV_GEM_H__
+
+#include <linux/reservation.h>
+#include "etnaviv_drv.h"
+
+struct etnaviv_gem_ops;
+struct etnaviv_gem_object;
+
+struct etnaviv_gem_userptr {
+ uintptr_t ptr;
+ struct task_struct *task;
+ struct work_struct *work;
+ bool ro;
+};
+
+struct etnaviv_vram_mapping {
+ struct list_head obj_node;
+ struct list_head scan_node;
+ struct list_head mmu_node;
+ struct etnaviv_gem_object *object;
+ struct etnaviv_iommu *mmu;
+ struct drm_mm_node vram_node;
+ unsigned int use;
+ u32 iova;
+};
+
+struct etnaviv_gem_object {
+ struct drm_gem_object base;
+ const struct etnaviv_gem_ops *ops;
+ struct mutex lock;
+
+ u32 flags;
+
+ struct list_head gem_node;
+ struct etnaviv_gpu *gpu; /* non-null if active */
+ atomic_t gpu_active;
+ u32 access;
+
+ struct page **pages;
+ struct sg_table *sgt;
+ void *vaddr;
+
+ /* normally (resv == &_resv) except for imported bo's */
+ struct reservation_object *resv;
+ struct reservation_object _resv;
+
+ struct list_head vram_list;
+
+ /* cache maintenance */
+ u32 last_cpu_prep_op;
+
+ struct etnaviv_gem_userptr userptr;
+};
+
+static inline
+struct etnaviv_gem_object *to_etnaviv_bo(struct drm_gem_object *obj)
+{
+ return container_of(obj, struct etnaviv_gem_object, base);
+}
+
+struct etnaviv_gem_ops {
+ int (*get_pages)(struct etnaviv_gem_object *);
+ void (*release)(struct etnaviv_gem_object *);
+};
+
+static inline bool is_active(struct etnaviv_gem_object *etnaviv_obj)
+{
+ return atomic_read(&etnaviv_obj->gpu_active) != 0;
+}
+
+#define MAX_CMDS 4
+
+/* Created per submit-ioctl, to track bo's and cmdstream bufs, etc,
+ * associated with the cmdstream submission for synchronization (and
+ * make it easier to unwind when things go wrong, etc). This only
+ * lasts for the duration of the submit-ioctl.
+ */
+struct etnaviv_gem_submit {
+ struct drm_device *dev;
+ struct etnaviv_gpu *gpu;
+ struct ww_acquire_ctx ticket;
+ u32 fence;
+ unsigned int nr_bos;
+ struct {
+ u32 flags;
+ struct etnaviv_gem_object *obj;
+ u32 iova;
+ } bos[0];
+};
+
+int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
+ struct timespec *timeout);
+int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
+ struct reservation_object *robj, const struct etnaviv_gem_ops *ops,
+ struct etnaviv_gem_object **res);
+int etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj);
+struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *obj);
+void etnaviv_gem_put_pages(struct etnaviv_gem_object *obj);
+
+#endif /* __ETNAVIV_GEM_H__ */
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
new file mode 100644
index 000000000000..e94db4f95770
--- /dev/null
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark at 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 <linux/dma-buf.h>
+#include "etnaviv_drv.h"
+#include "etnaviv_gem.h"
+
+
+struct sg_table *etnaviv_gem_prime_get_sg_table(struct drm_gem_object *obj)
+{
+ struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
+
+ BUG_ON(!etnaviv_obj->sgt); /* should have already pinned! */
+
+ return etnaviv_obj->sgt;
+}
+
+void *etnaviv_gem_prime_vmap(struct drm_gem_object *obj)
+{
+ return etnaviv_gem_vaddr(obj);
+}
+
+void etnaviv_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
+{
+ /* TODO msm_gem_vunmap() */
+}
+
+int etnaviv_gem_prime_pin(struct drm_gem_object *obj)
+{
+ if (!obj->import_attach) {
+ struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
+
+ mutex_lock(&etnaviv_obj->lock);
+ etnaviv_gem_get_pages(etnaviv_obj);
+ mutex_unlock(&etnaviv_obj->lock);
+ }
+ return 0;
+}
+
+void etnaviv_gem_prime_unpin(struct drm_gem_object *obj)
+{
+ if (!obj->import_attach) {
+ struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
+
+ mutex_lock(&etnaviv_obj->lock);
+ etnaviv_gem_put_pages(to_etnaviv_bo(obj));
+ mutex_unlock(&etnaviv_obj->lock);
+ }
+}
+
+static void etnaviv_gem_prime_release(struct etnaviv_gem_object *etnaviv_obj)
+{
+ if (etnaviv_obj->vaddr)
+ dma_buf_vunmap(etnaviv_obj->base.import_attach->dmabuf,
+ etnaviv_obj->vaddr);
+
+ /* Don't drop the pages for imported dmabuf, as they are not
+ * ours, just free the array we allocated:
+ */
+ if (etnaviv_obj->pages)
+ drm_free_large(etnaviv_obj->pages);
+
+ drm_prime_gem_destroy(&etnaviv_obj->base, etnaviv_obj->sgt);
+}
+
+static const struct etnaviv_gem_ops etnaviv_gem_prime_ops = {
+ /* .get_pages should never be called */
+ .release = etnaviv_gem_prime_release,
+};
+
+struct drm_gem_object *etnaviv_gem_prime_import_sg_table(struct drm_device *dev,
+ struct dma_buf_attachment *attach, struct sg_table *sgt)
+{
+ struct etnaviv_gem_object *etnaviv_obj;
+ size_t size = PAGE_ALIGN(attach->dmabuf->size);
+ int ret, npages;
+
+ ret = etnaviv_gem_new_private(dev, size, ETNA_BO_WC,
+ attach->dmabuf->resv,
+ &etnaviv_gem_prime_ops, &etnaviv_obj);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ npages = size / PAGE_SIZE;
+
+ etnaviv_obj->sgt = sgt;
+ etnaviv_obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
+ if (!etnaviv_obj->pages) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ ret = drm_prime_sg_to_page_addr_arrays(sgt, etnaviv_obj->pages,
+ NULL, npages);
+ if (ret)
+ goto fail;
+
+ ret = etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
+ if (ret)
+ goto fail;
+
+ return &etnaviv_obj->base;
+
+fail:
+ drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
+
+ return ERR_PTR(ret);
+}
--
2.6.2
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