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-rw-r--r--drivers/gpu/drm/Kconfig1
-rw-r--r--drivers/gpu/drm/Makefile2
-rw-r--r--drivers/gpu/drm/drm_drv.c4
-rw-r--r--drivers/gpu/drm/drm_fops.c7
-rw-r--r--drivers/gpu/drm/drm_gem.c9
-rw-r--r--drivers/gpu/drm/drm_prime.c304
6 files changed, 326 insertions, 1 deletions
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index cc1148837e24..e354bc0b052a 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -9,6 +9,7 @@ menuconfig DRM
depends on (AGP || AGP=n) && !EMULATED_CMPXCHG && MMU
select I2C
select I2C_ALGOBIT
+ select DMA_SHARED_BUFFER
help
Kernel-level support for the Direct Rendering Infrastructure (DRI)
introduced in XFree86 4.0. If you say Y here, you need to select
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index a858532806ae..c20da5bda355 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -12,7 +12,7 @@ drm-y := drm_auth.o drm_buffer.o drm_bufs.o drm_cache.o \
drm_platform.o drm_sysfs.o drm_hashtab.o drm_mm.o \
drm_crtc.o drm_modes.o drm_edid.o \
drm_info.o drm_debugfs.o drm_encoder_slave.o \
- drm_trace_points.o drm_global.o
+ drm_trace_points.o drm_global.o drm_prime.o
drm-$(CONFIG_COMPAT) += drm_ioc32.o
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 0b65fbc8a630..6116e3b75393 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -136,6 +136,10 @@ static struct drm_ioctl_desc drm_ioctls[] = {
DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
+
+ DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED),
+ DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED),
+
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index 7348a3dab250..cdfbf27b2b3c 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -271,6 +271,9 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
if (dev->driver->driver_features & DRIVER_GEM)
drm_gem_open(dev, priv);
+ if (drm_core_check_feature(dev, DRIVER_PRIME))
+ drm_prime_init_file_private(&priv->prime);
+
if (dev->driver->open) {
ret = dev->driver->open(dev, priv);
if (ret < 0)
@@ -571,6 +574,10 @@ int drm_release(struct inode *inode, struct file *filp)
if (dev->driver->postclose)
dev->driver->postclose(dev, file_priv);
+
+ if (drm_core_check_feature(dev, DRIVER_PRIME))
+ drm_prime_destroy_file_private(&file_priv->prime);
+
kfree(file_priv);
/* ========================================================
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 0ef358e53245..83114b5e3cee 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -35,6 +35,7 @@
#include <linux/mman.h>
#include <linux/pagemap.h>
#include <linux/shmem_fs.h>
+#include <linux/dma-buf.h>
#include "drmP.h"
/** @file drm_gem.c
@@ -232,6 +233,10 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
idr_remove(&filp->object_idr, handle);
spin_unlock(&filp->table_lock);
+ if (obj->import_attach)
+ drm_prime_remove_imported_buf_handle(&filp->prime,
+ obj->import_attach->dmabuf);
+
if (dev->driver->gem_close_object)
dev->driver->gem_close_object(obj, filp);
drm_gem_object_handle_unreference_unlocked(obj);
@@ -527,6 +532,10 @@ drm_gem_object_release_handle(int id, void *ptr, void *data)
struct drm_gem_object *obj = ptr;
struct drm_device *dev = obj->dev;
+ if (obj->import_attach)
+ drm_prime_remove_imported_buf_handle(&file_priv->prime,
+ obj->import_attach->dmabuf);
+
if (dev->driver->gem_close_object)
dev->driver->gem_close_object(obj, file_priv);
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
new file mode 100644
index 000000000000..1bdf2b54eaf6
--- /dev/null
+++ b/drivers/gpu/drm/drm_prime.c
@@ -0,0 +1,304 @@
+/*
+ * Copyright © 2012 Red Hat
+ *
+ * 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@redhat.com>
+ * Rob Clark <rob.clark@linaro.org>
+ *
+ */
+
+#include <linux/export.h>
+#include <linux/dma-buf.h>
+#include "drmP.h"
+
+/*
+ * DMA-BUF/GEM Object references and lifetime overview:
+ *
+ * On the export the dma_buf holds a reference to the exporting GEM
+ * object. It takes this reference in handle_to_fd_ioctl, when it
+ * first calls .prime_export and stores the exporting GEM object in
+ * the dma_buf priv. This reference is released when the dma_buf
+ * object goes away in the driver .release function.
+ *
+ * On the import the importing GEM object holds a reference to the
+ * dma_buf (which in turn holds a ref to the exporting GEM object).
+ * It takes that reference in the fd_to_handle ioctl.
+ * It calls dma_buf_get, creates an attachment to it and stores the
+ * attachment in the GEM object. When this attachment is destroyed
+ * when the imported object is destroyed, we remove the attachment
+ * and drop the reference to the dma_buf.
+ *
+ * Thus the chain of references always flows in one direction
+ * (avoiding loops): importing_gem -> dmabuf -> exporting_gem
+ *
+ * Self-importing: if userspace is using PRIME as a replacement for flink
+ * then it will get a fd->handle request for a GEM object that it created.
+ * Drivers should detect this situation and return back the gem object
+ * from the dma-buf private.
+ */
+
+struct drm_prime_member {
+ struct list_head entry;
+ struct dma_buf *dma_buf;
+ uint32_t handle;
+};
+
+int drm_gem_prime_handle_to_fd(struct drm_device *dev,
+ struct drm_file *file_priv, uint32_t handle, uint32_t flags,
+ int *prime_fd)
+{
+ struct drm_gem_object *obj;
+ void *buf;
+
+ obj = drm_gem_object_lookup(dev, file_priv, handle);
+ if (!obj)
+ return -ENOENT;
+
+ mutex_lock(&file_priv->prime.lock);
+ /* re-export the original imported object */
+ if (obj->import_attach) {
+ get_dma_buf(obj->import_attach->dmabuf);
+ *prime_fd = dma_buf_fd(obj->import_attach->dmabuf, flags);
+ drm_gem_object_unreference_unlocked(obj);
+ mutex_unlock(&file_priv->prime.lock);
+ return 0;
+ }
+
+ if (obj->export_dma_buf) {
+ get_dma_buf(obj->export_dma_buf);
+ *prime_fd = dma_buf_fd(obj->export_dma_buf, flags);
+ drm_gem_object_unreference_unlocked(obj);
+ } else {
+ buf = dev->driver->gem_prime_export(dev, obj, flags);
+ if (IS_ERR(buf)) {
+ /* normally the created dma-buf takes ownership of the ref,
+ * but if that fails then drop the ref
+ */
+ drm_gem_object_unreference_unlocked(obj);
+ mutex_unlock(&file_priv->prime.lock);
+ return PTR_ERR(buf);
+ }
+ obj->export_dma_buf = buf;
+ *prime_fd = dma_buf_fd(buf, flags);
+ }
+ mutex_unlock(&file_priv->prime.lock);
+ return 0;
+}
+EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);
+
+int drm_gem_prime_fd_to_handle(struct drm_device *dev,
+ struct drm_file *file_priv, int prime_fd, uint32_t *handle)
+{
+ struct dma_buf *dma_buf;
+ struct drm_gem_object *obj;
+ int ret;
+
+ dma_buf = dma_buf_get(prime_fd);
+ if (IS_ERR(dma_buf))
+ return PTR_ERR(dma_buf);
+
+ mutex_lock(&file_priv->prime.lock);
+
+ ret = drm_prime_lookup_imported_buf_handle(&file_priv->prime,
+ dma_buf, handle);
+ if (!ret) {
+ ret = 0;
+ goto out_put;
+ }
+
+ /* never seen this one, need to import */
+ obj = dev->driver->gem_prime_import(dev, dma_buf);
+ if (IS_ERR(obj)) {
+ ret = PTR_ERR(obj);
+ goto out_put;
+ }
+
+ ret = drm_gem_handle_create(file_priv, obj, handle);
+ drm_gem_object_unreference_unlocked(obj);
+ if (ret)
+ goto out_put;
+
+ ret = drm_prime_add_imported_buf_handle(&file_priv->prime,
+ dma_buf, *handle);
+ if (ret)
+ goto fail;
+
+ mutex_unlock(&file_priv->prime.lock);
+ return 0;
+
+fail:
+ /* hmm, if driver attached, we are relying on the free-object path
+ * to detach.. which seems ok..
+ */
+ drm_gem_object_handle_unreference_unlocked(obj);
+out_put:
+ dma_buf_put(dma_buf);
+ mutex_unlock(&file_priv->prime.lock);
+ return ret;
+}
+EXPORT_SYMBOL(drm_gem_prime_fd_to_handle);
+
+int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_prime_handle *args = data;
+ uint32_t flags;
+
+ if (!drm_core_check_feature(dev, DRIVER_PRIME))
+ return -EINVAL;
+
+ if (!dev->driver->prime_handle_to_fd)
+ return -ENOSYS;
+
+ /* check flags are valid */
+ if (args->flags & ~DRM_CLOEXEC)
+ return -EINVAL;
+
+ /* we only want to pass DRM_CLOEXEC which is == O_CLOEXEC */
+ flags = args->flags & DRM_CLOEXEC;
+
+ return dev->driver->prime_handle_to_fd(dev, file_priv,
+ args->handle, flags, &args->fd);
+}
+
+int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_prime_handle *args = data;
+
+ if (!drm_core_check_feature(dev, DRIVER_PRIME))
+ return -EINVAL;
+
+ if (!dev->driver->prime_fd_to_handle)
+ return -ENOSYS;
+
+ return dev->driver->prime_fd_to_handle(dev, file_priv,
+ args->fd, &args->handle);
+}
+
+/*
+ * drm_prime_pages_to_sg
+ *
+ * this helper creates an sg table object from a set of pages
+ * the driver is responsible for mapping the pages into the
+ * importers address space
+ */
+struct sg_table *drm_prime_pages_to_sg(struct page **pages, int nr_pages)
+{
+ struct sg_table *sg = NULL;
+ struct scatterlist *iter;
+ int i;
+ int ret;
+
+ sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
+ if (!sg)
+ goto out;
+
+ ret = sg_alloc_table(sg, nr_pages, GFP_KERNEL);
+ if (ret)
+ goto out;
+
+ for_each_sg(sg->sgl, iter, nr_pages, i)
+ sg_set_page(iter, pages[i], PAGE_SIZE, 0);
+
+ return sg;
+out:
+ kfree(sg);
+ return NULL;
+}
+EXPORT_SYMBOL(drm_prime_pages_to_sg);
+
+/* helper function to cleanup a GEM/prime object */
+void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg)
+{
+ struct dma_buf_attachment *attach;
+ struct dma_buf *dma_buf;
+ attach = obj->import_attach;
+ if (sg)
+ dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
+ dma_buf = attach->dmabuf;
+ dma_buf_detach(attach->dmabuf, attach);
+ /* remove the reference */
+ dma_buf_put(dma_buf);
+}
+EXPORT_SYMBOL(drm_prime_gem_destroy);
+
+void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv)
+{
+ INIT_LIST_HEAD(&prime_fpriv->head);
+ mutex_init(&prime_fpriv->lock);
+}
+EXPORT_SYMBOL(drm_prime_init_file_private);
+
+void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv)
+{
+ struct drm_prime_member *member, *safe;
+ list_for_each_entry_safe(member, safe, &prime_fpriv->head, entry) {
+ list_del(&member->entry);
+ kfree(member);
+ }
+}
+EXPORT_SYMBOL(drm_prime_destroy_file_private);
+
+int drm_prime_add_imported_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t handle)
+{
+ struct drm_prime_member *member;
+
+ member = kmalloc(sizeof(*member), GFP_KERNEL);
+ if (!member)
+ return -ENOMEM;
+
+ member->dma_buf = dma_buf;
+ member->handle = handle;
+ list_add(&member->entry, &prime_fpriv->head);
+ return 0;
+}
+EXPORT_SYMBOL(drm_prime_add_imported_buf_handle);
+
+int drm_prime_lookup_imported_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t *handle)
+{
+ struct drm_prime_member *member;
+
+ list_for_each_entry(member, &prime_fpriv->head, entry) {
+ if (member->dma_buf == dma_buf) {
+ *handle = member->handle;
+ return 0;
+ }
+ }
+ return -ENOENT;
+}
+EXPORT_SYMBOL(drm_prime_lookup_imported_buf_handle);
+
+void drm_prime_remove_imported_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf)
+{
+ struct drm_prime_member *member, *safe;
+
+ mutex_lock(&prime_fpriv->lock);
+ list_for_each_entry_safe(member, safe, &prime_fpriv->head, entry) {
+ if (member->dma_buf == dma_buf) {
+ list_del(&member->entry);
+ kfree(member);
+ }
+ }
+ mutex_unlock(&prime_fpriv->lock);
+}
+EXPORT_SYMBOL(drm_prime_remove_imported_buf_handle);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-25 10:29:11 +0000