This adds handle->fd and fd->handle support to i915, this is to allow
for offloading of rendering in one direction and outputs in the other.
v2 from Daniel Vetter:
- fixup conflicts with the prepare/finish gtt prep work.
- implement ppgtt binding support.
Note that we have squat i-g-t testcoverage for any of the lifetime and
access rules dma_buf/prime support brings along. And there are quite a
few intricate situations here.
Also note that the integration with the existing code is a bit
hackish, especially around get_gtt_pages and put_gtt_pages. It imo
would be easier with the prep code from Chris Wilson's unbound series,
but that is for 3.6.
Also note that I didn't bother to put the new prepare/finish gtt hooks
to good use by moving the dma_buf_map/unmap_attachment calls in there
(like we've originally planned for).
Last but not least this patch is only compile-tested, but I've changed
very little compared to Dave Airlie's version. So there's a decent
chance v2 on drm-next works as well as v1 on 3.4-rc.
v3: Right when I've hit sent I've noticed that I've screwed up one
obj->sg_list (for dmar support) and obj->sg_table (for prime support)
disdinction. We should be able to merge these 2 paths, but that's
material for another patch.
Signed-off-by: Dave Airlie <airlied at redhat.com>
Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
drivers/gpu/drm/i915/Makefile | 3 +-
drivers/gpu/drm/i915/i915_drv.c | 8 +-
drivers/gpu/drm/i915/i915_drv.h | 11 +++
drivers/gpu/drm/i915/i915_gem.c | 13 ++-
drivers/gpu/drm/i915/i915_gem_dmabuf.c | 149 ++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_gem_gtt.c | 15 +++-
6 files changed, 193 insertions(+), 6 deletions(-)
create mode 100644 drivers/gpu/drm/i915/i915_gem_dmabuf.c
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 8b8bbc7..7b7ecb8 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -37,7 +37,8 @@ i915-y := i915_drv.o i915_dma.o i915_irq.o \
dvo_ch7017.o \
dvo_ivch.o \
dvo_tfp410.o \
- dvo_sil164.o
+ dvo_sil164.o \
+ i915_gem_dmabuf.o
i915-$(CONFIG_COMPAT) += i915_ioc32.o
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 1ccfc23..ac13c2c 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1034,7 +1034,7 @@ static struct drm_driver driver = {
*/
.driver_features =
DRIVER_USE_AGP | DRIVER_REQUIRE_AGP | /* DRIVER_USE_MTRR |*/
- DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_GEM,
+ DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_GEM | DRIVER_PRIME,
.load = i915_driver_load,
.unload = i915_driver_unload,
.open = i915_driver_open,
@@ -1057,6 +1057,12 @@ static struct drm_driver driver = {
.gem_init_object = i915_gem_init_object,
.gem_free_object = i915_gem_free_object,
.gem_vm_ops = &i915_gem_vm_ops,
+
+ .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+ .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+ .gem_prime_export = i915_gem_prime_export,
+ .gem_prime_import = i915_gem_prime_import,
+
.dumb_create = i915_gem_dumb_create,
.dumb_map_offset = i915_gem_mmap_gtt,
.dumb_destroy = i915_gem_dumb_destroy,
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e03a4f8..751f25c 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -935,6 +935,8 @@ struct drm_i915_gem_object {
struct scatterlist *sg_list;
int num_sg;
+ /* prime dma-buf support */
+ struct sg_table *sg_table;
/**
* Used for performing relocations during execbuffer insertion.
*/
@@ -1240,6 +1242,8 @@ int __must_check i915_gem_object_unbind(struct drm_i915_gem_object *obj);
void i915_gem_release_mmap(struct drm_i915_gem_object *obj);
void i915_gem_lastclose(struct drm_device *dev);
+int i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj,
+ gfp_t gfpmask);
int __must_check i915_mutex_lock_interruptible(struct drm_device *dev);
int __must_check i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj);
int i915_gem_object_sync(struct drm_i915_gem_object *obj,
@@ -1337,6 +1341,13 @@ i915_gem_get_unfenced_gtt_alignment(struct drm_device *dev,
int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
enum i915_cache_level cache_level);
+struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
+ struct dma_buf *dma_buf);
+
+struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
+ struct drm_gem_object *gem_obj, int flags);
+
+
/* i915_gem_gtt.c */
int __must_check i915_gem_init_aliasing_ppgtt(struct drm_device *dev);
void i915_gem_cleanup_aliasing_ppgtt(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 44a5f24..ba0ade5 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -35,6 +35,7 @@
#include <linux/slab.h>
#include <linux/swap.h>
#include <linux/pci.h>
+#include <linux/dma-buf.h>
static __must_check int i915_gem_object_flush_gpu_write_domain(struct drm_i915_gem_object *obj);
static void i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj);
@@ -1302,8 +1303,7 @@ i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
return i915_gem_mmap_gtt(file, dev, args->handle, &args->offset);
}
-
-static int
+int
i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj,
gfp_t gfpmask)
{
@@ -1312,6 +1312,9 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj,
struct inode *inode;
struct page *page;
+ if (obj->pages || obj->sg_table)
+ return 0;
+
/* Get the list of pages out of our struct file. They'll be pinned
* at this point until we release them.
*/
@@ -1353,6 +1356,9 @@ i915_gem_object_put_pages_gtt(struct drm_i915_gem_object *obj)
int page_count = obj->base.size / PAGE_SIZE;
int i;
+ if (!obj->pages)
+ return;
+
BUG_ON(obj->madv == __I915_MADV_PURGED);
if (i915_gem_object_needs_bit17_swizzle(obj))
@@ -3321,6 +3327,9 @@ void i915_gem_free_object(struct drm_gem_object *gem_obj)
trace_i915_gem_object_destroy(obj);
+ if (gem_obj->import_attach)
+ drm_prime_gem_destroy(gem_obj, obj->sg_table);
+
if (obj->phys_obj)
i915_gem_detach_phys_object(dev, obj);
diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
new file mode 100644
index 0000000..6ee677d
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright 2012 Red Hat Inc
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ * Dave Airlie <airlied at redhat.com>
+ */
+#include "drmP.h"
+#include "i915_drv.h"
+#include <linux/dma-buf.h>
+
+struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment,
+ enum dma_data_direction dir)
+{
+ struct drm_i915_gem_object *obj = attachment->dmabuf->priv;
+ struct drm_device *dev = obj->base.dev;
+ int npages = obj->base.size / PAGE_SIZE;
+ struct sg_table *sg = NULL;
+ int ret;
+ int nents;
+
+ ret = i915_mutex_lock_interruptible(dev);
+ if (ret)
+ return NULL;
+
+ if (!obj->pages) {
+ ret = i915_gem_object_get_pages_gtt(obj, __GFP_NORETRY | __GFP_NOWARN);
+ if (ret)
+ goto out;
+ }
+
+ /* link the pages into an SG then map the sg */
+ sg = drm_prime_pages_to_sg(obj->pages, npages);
+ nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir);
+out:
+ mutex_unlock(&dev->struct_mutex);
+ return sg;
+}
+
+void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
+ struct sg_table *sg, enum dma_data_direction dir)
+{
+ dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
+ sg_free_table(sg);
+ kfree(sg);
+}
+
+void i915_gem_dmabuf_release(struct dma_buf *dma_buf)
+{
+ struct drm_i915_gem_object *obj = dma_buf->priv;
+
+ if (obj->base.export_dma_buf == dma_buf) {
+ /* drop the reference on the export fd holds */
+ obj->base.export_dma_buf = NULL;
+ drm_gem_object_unreference_unlocked(&obj->base);
+ }
+}
+
+struct dma_buf_ops i915_dmabuf_ops = {
+ .map_dma_buf = i915_gem_map_dma_buf,
+ .unmap_dma_buf = i915_gem_unmap_dma_buf,
+ .release = i915_gem_dmabuf_release,
+};
+
+struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
+ struct drm_gem_object *gem_obj, int flags)
+{
+ struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
+
+ return dma_buf_export(obj, &i915_dmabuf_ops,
+ obj->base.size, 0600);
+}
+
+struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
+ struct dma_buf *dma_buf)
+{
+ struct dma_buf_attachment *attach;
+ struct sg_table *sg;
+ struct drm_i915_gem_object *obj;
+ int npages;
+ int size;
+ int ret;
+
+ /* is this one of own objects? */
+ if (dma_buf->ops == &i915_dmabuf_ops) {
+ obj = dma_buf->priv;
+ /* is it from our device? */
+ if (obj->base.dev == dev) {
+ drm_gem_object_reference(&obj->base);
+ return &obj->base;
+ }
+ }
+
+ /* need to attach */
+ attach = dma_buf_attach(dma_buf, dev->dev);
+ if (IS_ERR(attach))
+ return ERR_PTR(-EINVAL);
+
+ sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
+ if (IS_ERR(sg)) {
+ ret = PTR_ERR(sg);
+ goto fail_detach;
+ }
+
+ size = dma_buf->size;
+ npages = size / PAGE_SIZE;
+
+ obj = kzalloc(sizeof(*obj), GFP_KERNEL);
+ if (obj == NULL) {
+ ret = -ENOMEM;
+ goto fail_unmap;
+ }
+
+ ret = drm_gem_private_object_init(dev, &obj->base, size);
+ if (ret) {
+ ret = -ENOMEM;
+ kfree(obj);
+ goto fail_unmap;
+ }
+
+ obj->sg_table = sg;
+ obj->base.import_attach = attach;
+
+ return &obj->base;
+
+fail_unmap:
+ dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
+fail_detach:
+ dma_buf_detach(dma_buf, attach);
+ return ERR_PTR(ret);
+}
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 29d573c..9fd25a4 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -267,7 +267,13 @@ void i915_ppgtt_bind_object(struct i915_hw_ppgtt *ppgtt,
BUG();
}
- if (dev_priv->mm.gtt->needs_dmar) {
+ if (obj->sg_table) {
+ i915_ppgtt_insert_sg_entries(ppgtt,
+ obj->sg_table->sgl,
+ obj->sg_table->nents,
+ obj->gtt_space->start >> PAGE_SHIFT,
+ pte_flags);
+ } else if (dev_priv->mm.gtt->needs_dmar) {
BUG_ON(!obj->sg_list);
i915_ppgtt_insert_sg_entries(ppgtt,
@@ -371,7 +377,12 @@ void i915_gem_gtt_bind_object(struct drm_i915_gem_object *obj,
struct drm_i915_private *dev_priv = dev->dev_private;
unsigned int agp_type = cache_level_to_agp_type(dev, cache_level);
- if (dev_priv->mm.gtt->needs_dmar) {
+ if (obj->sg_table) {
+ intel_gtt_insert_sg_entries(obj->sg_table->sgl,
+ obj->sg_table->nents,
+ obj->gtt_space->start >> PAGE_SHIFT,
+ agp_type);
+ } else if (dev_priv->mm.gtt->needs_dmar) {
BUG_ON(!obj->sg_list);
intel_gtt_insert_sg_entries(obj->sg_list,
--
1.7.10
