[RFC 2/3] drm/gem: Add drm_gem_object_funcs
Noralf Trønnes
noralf at tronnes.org
Fri Sep 21 16:42:29 UTC 2018
This adds an optional function table on GEM objects.
The main benefit is for drivers that support more than one type of
memory (shmem,vram,cma) for their buffers depending on the hardware it
runs on. With the callbacks attached to the GEM object itself, it is
easier to have core helpers for the the various buffer types. The driver
only has to make the decision about buffer type on GEM object creation
and all other callbacks can be handled by the chosen helper.
drm_driver->gem_prime_res_obj has not been added since there's a todo to
put a reservation_object into drm_gem_object.
The individual drm_driver callbacks take priority over the GEM attached
callbacks.
Signed-off-by: Noralf Trønnes <noralf at tronnes.org>
---
drivers/gpu/drm/drm_client.c | 12 ++--
drivers/gpu/drm/drm_fb_helper.c | 8 ++-
drivers/gpu/drm/drm_gem.c | 108 +++++++++++++++++++++++++++++--
drivers/gpu/drm/drm_prime.c | 40 ++++++------
include/drm/drm_gem.h | 138 ++++++++++++++++++++++++++++++++++++++++
5 files changed, 272 insertions(+), 34 deletions(-)
diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
index 17d9a64e885e..eca7331762e4 100644
--- a/drivers/gpu/drm/drm_client.c
+++ b/drivers/gpu/drm/drm_client.c
@@ -80,8 +80,7 @@ int drm_client_new(struct drm_device *dev, struct drm_client_dev *client,
{
int ret;
- if (!drm_core_check_feature(dev, DRIVER_MODESET) ||
- !dev->driver->dumb_create || !dev->driver->gem_prime_vmap)
+ if (!drm_core_check_feature(dev, DRIVER_MODESET) || !dev->driver->dumb_create)
return -EOPNOTSUPP;
if (funcs && !try_module_get(funcs->owner))
@@ -212,8 +211,7 @@ static void drm_client_buffer_delete(struct drm_client_buffer *buffer)
{
struct drm_device *dev = buffer->client->dev;
- if (buffer->vaddr && dev->driver->gem_prime_vunmap)
- dev->driver->gem_prime_vunmap(buffer->gem, buffer->vaddr);
+ drm_gem_vunmap(buffer->gem, buffer->vaddr);
if (buffer->gem)
drm_gem_object_put_unlocked(buffer->gem);
@@ -266,9 +264,9 @@ drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height, u
* fd_install step out of the driver backend hooks, to make that
* final step optional for internal users.
*/
- vaddr = dev->driver->gem_prime_vmap(obj);
- if (!vaddr) {
- ret = -ENOMEM;
+ vaddr = drm_gem_vmap(obj);
+ if (IS_ERR(vaddr)) {
+ ret = PTR_ERR(vaddr);
goto err_delete;
}
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 8e95d0f7c71d..66969f0facbb 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -38,6 +38,7 @@
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
@@ -3010,9 +3011,12 @@ static void drm_fbdev_fb_destroy(struct fb_info *info)
static int drm_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct drm_fb_helper *fb_helper = info->par;
+ struct drm_gem_object *obj = fb_helper->buffer->gem;
- if (fb_helper->dev->driver->gem_prime_mmap)
- return fb_helper->dev->driver->gem_prime_mmap(fb_helper->buffer->gem, vma);
+ if (obj->dev->driver->gem_prime_mmap)
+ return obj->dev->driver->gem_prime_mmap(obj, vma);
+ else if (obj->funcs && obj->funcs->mmap)
+ return drm_gem_mmap_obj(obj, obj->size, vma);
else
return -ENODEV;
}
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 512078ebd97b..7da2549667ce 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -259,6 +259,8 @@ drm_gem_object_release_handle(int id, void *ptr, void *data)
if (dev->driver->gem_close_object)
dev->driver->gem_close_object(obj, file_priv);
+ else if (obj->funcs && obj->funcs->close)
+ obj->funcs->close(obj, file_priv);
if (drm_core_check_feature(dev, DRIVER_PRIME))
drm_gem_remove_prime_handles(obj, file_priv);
@@ -414,6 +416,10 @@ drm_gem_handle_create_tail(struct drm_file *file_priv,
ret = dev->driver->gem_open_object(obj, file_priv);
if (ret)
goto err_revoke;
+ } else if (obj->funcs && obj->funcs->open) {
+ ret = obj->funcs->open(obj, file_priv);
+ if (ret)
+ goto err_revoke;
}
*handlep = handle;
@@ -841,6 +847,8 @@ drm_gem_object_free(struct kref *kref)
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
dev->driver->gem_free_object(obj);
+ } else if (obj->funcs) {
+ obj->funcs->free(obj);
}
}
EXPORT_SYMBOL(drm_gem_object_free);
@@ -864,13 +872,13 @@ drm_gem_object_put_unlocked(struct drm_gem_object *obj)
dev = obj->dev;
- if (dev->driver->gem_free_object_unlocked) {
- kref_put(&obj->refcount, drm_gem_object_free);
- } else {
+ if (dev->driver->gem_free_object) {
might_lock(&dev->struct_mutex);
if (kref_put_mutex(&obj->refcount, drm_gem_object_free,
&dev->struct_mutex))
mutex_unlock(&dev->struct_mutex);
+ } else {
+ kref_put(&obj->refcount, drm_gem_object_free);
}
}
EXPORT_SYMBOL(drm_gem_object_put_unlocked);
@@ -955,20 +963,30 @@ int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
struct vm_area_struct *vma)
{
struct drm_device *dev = obj->dev;
+ int ret;
/* Check for valid size. */
if (obj_size < vma->vm_end - vma->vm_start)
return -EINVAL;
- if (!dev->driver->gem_vm_ops)
+ if (dev->driver->gem_vm_ops)
+ vma->vm_ops = dev->driver->gem_vm_ops;
+ else if (obj->funcs && obj->funcs->vm_ops)
+ vma->vm_ops = obj->funcs->vm_ops;
+ else
return -EINVAL;
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
- vma->vm_ops = dev->driver->gem_vm_ops;
vma->vm_private_data = obj;
vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
+ if (obj->funcs && obj->funcs->mmap) {
+ ret = obj->funcs->mmap(obj, vma);
+ if (ret)
+ return ret;
+ }
+
/* Take a ref for this mapping of the object, so that the fault
* handler can dereference the mmap offset's pointer to the object.
* This reference is cleaned up by the corresponding vm_close
@@ -1068,4 +1086,84 @@ void drm_gem_print_info(struct drm_printer *p, unsigned int indent,
if (obj->dev->driver->gem_print_info)
obj->dev->driver->gem_print_info(p, indent, obj);
+ else if (obj->funcs && obj->funcs->print_info)
+ obj->funcs->print_info(p, indent, obj);
}
+
+/**
+ * drm_gem_pin - Pin backing buffer in memory
+ * @obj: GEM object
+ *
+ * Make sure the backing buffer is pinned in memory.
+ *
+ * Returns:
+ * 0 on success or a negative error code on failure.
+ */
+int drm_gem_pin(struct drm_gem_object *obj)
+{
+ if (obj->dev->driver->gem_prime_pin)
+ return obj->dev->driver->gem_prime_pin(obj);
+ else if (obj->funcs && obj->funcs->pin)
+ return obj->funcs->pin(obj);
+ else
+ return 0;
+}
+EXPORT_SYMBOL(drm_gem_pin);
+
+/**
+ * drm_gem_pin - Unpin backing buffer from memory
+ * @obj: GEM object
+ *
+ * Relax the requirement that the backing buffer is pinned in memory.
+ */
+void drm_gem_unpin(struct drm_gem_object *obj)
+{
+ if (obj->dev->driver->gem_prime_unpin)
+ obj->dev->driver->gem_prime_unpin(obj);
+ else if (obj->funcs && obj->funcs->unpin)
+ obj->funcs->unpin(obj);
+}
+EXPORT_SYMBOL(drm_gem_unpin);
+
+/**
+ * drm_gem_vmap - Map buffer into kernel virtual address space
+ * @obj: GEM object
+ *
+ * Returns:
+ * A virtual pointer to a newly created GEM object or an ERR_PTR-encoded negative
+ * error code on failure.
+ */
+void *drm_gem_vmap(struct drm_gem_object *obj)
+{
+ void *vaddr;
+
+ if (obj->dev->driver->gem_prime_vmap)
+ vaddr = obj->dev->driver->gem_prime_vmap(obj);
+ else if (obj->funcs && obj->funcs->vmap)
+ vaddr = obj->funcs->vmap(obj);
+ else
+ vaddr = ERR_PTR(-EOPNOTSUPP);
+
+ if (!vaddr)
+ vaddr = ERR_PTR(-ENOMEM);
+
+ return vaddr;
+}
+EXPORT_SYMBOL(drm_gem_vmap);
+
+/**
+ * drm_gem_vunmap - Remove buffer mapping from kernel virtual address space
+ * @obj: GEM object
+ * @vaddr: Virtual address (can be NULL)
+ */
+void drm_gem_vunmap(struct drm_gem_object *obj, void *vaddr)
+{
+ if (!vaddr)
+ return;
+
+ if (obj->dev->driver->gem_prime_vunmap)
+ obj->dev->driver->gem_prime_vunmap(obj, vaddr);
+ else if (obj->funcs && obj->funcs->vunmap)
+ obj->funcs->vunmap(obj, vaddr);
+}
+EXPORT_SYMBOL(drm_gem_vunmap);
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 6721571749ff..7f5c9500136b 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -199,7 +199,6 @@ int drm_gem_map_attach(struct dma_buf *dma_buf,
{
struct drm_prime_attachment *prime_attach;
struct drm_gem_object *obj = dma_buf->priv;
- struct drm_device *dev = obj->dev;
prime_attach = kzalloc(sizeof(*prime_attach), GFP_KERNEL);
if (!prime_attach)
@@ -208,10 +207,7 @@ int drm_gem_map_attach(struct dma_buf *dma_buf,
prime_attach->dir = DMA_NONE;
attach->priv = prime_attach;
- if (!dev->driver->gem_prime_pin)
- return 0;
-
- return dev->driver->gem_prime_pin(obj);
+ return drm_gem_pin(obj);
}
EXPORT_SYMBOL(drm_gem_map_attach);
@@ -228,7 +224,6 @@ void drm_gem_map_detach(struct dma_buf *dma_buf,
{
struct drm_prime_attachment *prime_attach = attach->priv;
struct drm_gem_object *obj = dma_buf->priv;
- struct drm_device *dev = obj->dev;
if (prime_attach) {
struct sg_table *sgt = prime_attach->sgt;
@@ -247,8 +242,7 @@ void drm_gem_map_detach(struct dma_buf *dma_buf,
attach->priv = NULL;
}
- if (dev->driver->gem_prime_unpin)
- dev->driver->gem_prime_unpin(obj);
+ drm_gem_unpin(obj);
}
EXPORT_SYMBOL(drm_gem_map_detach);
@@ -310,7 +304,10 @@ struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
if (WARN_ON(prime_attach->dir != DMA_NONE))
return ERR_PTR(-EBUSY);
- sgt = obj->dev->driver->gem_prime_get_sg_table(obj);
+ if (obj->dev->driver->gem_prime_get_sg_table)
+ sgt = obj->dev->driver->gem_prime_get_sg_table(obj);
+ else
+ sgt = obj->funcs->get_sg_table(obj);
if (!IS_ERR(sgt)) {
if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
@@ -406,12 +403,13 @@ EXPORT_SYMBOL(drm_gem_dmabuf_release);
void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf)
{
struct drm_gem_object *obj = dma_buf->priv;
- struct drm_device *dev = obj->dev;
+ void *vaddr;
- if (dev->driver->gem_prime_vmap)
- return dev->driver->gem_prime_vmap(obj);
- else
- return NULL;
+ vaddr = drm_gem_vmap(obj);
+ if (IS_ERR(vaddr))
+ vaddr = NULL;
+
+ return vaddr;
}
EXPORT_SYMBOL(drm_gem_dmabuf_vmap);
@@ -426,10 +424,8 @@ EXPORT_SYMBOL(drm_gem_dmabuf_vmap);
void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
{
struct drm_gem_object *obj = dma_buf->priv;
- struct drm_device *dev = obj->dev;
- if (dev->driver->gem_prime_vunmap)
- dev->driver->gem_prime_vunmap(obj, vaddr);
+ drm_gem_vunmap(obj, vaddr);
}
EXPORT_SYMBOL(drm_gem_dmabuf_vunmap);
@@ -476,10 +472,12 @@ int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
struct drm_gem_object *obj = dma_buf->priv;
struct drm_device *dev = obj->dev;
- if (!dev->driver->gem_prime_mmap)
+ if (dev->driver->gem_prime_mmap)
+ return dev->driver->gem_prime_mmap(obj, vma);
+ else if (obj->funcs && obj->funcs->mmap)
+ return drm_gem_mmap_obj(obj, obj->size, vma);
+ else
return -ENOSYS;
-
- return dev->driver->gem_prime_mmap(obj, vma);
}
EXPORT_SYMBOL(drm_gem_dmabuf_mmap);
@@ -561,6 +559,8 @@ static struct dma_buf *export_and_register_object(struct drm_device *dev,
if (dev->driver->gem_prime_export)
dmabuf = dev->driver->gem_prime_export(dev, obj, flags);
+ else if (obj->funcs && obj->funcs->export)
+ dmabuf = obj->funcs->export(obj, flags);
else
dmabuf = drm_gem_prime_export(dev, obj, flags);
if (IS_ERR(dmabuf)) {
diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index 3583b98a1718..3ae3665bf4e7 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -38,6 +38,130 @@
#include <drm/drm_vma_manager.h>
+struct drm_gem_object;
+
+/**
+ * struct drm_gem_object_funcs - GEM object functions
+ */
+struct drm_gem_object_funcs {
+ /**
+ * @free:
+ *
+ * Deconstructor for drm_gem_objects.
+ *
+ * This callback is mandatory.
+ */
+ void (*free)(struct drm_gem_object *obj);
+
+ /**
+ * @open:
+ *
+ * Called upon GEM handle creation.
+ *
+ * This callback is optional.
+ */
+ int (*open)(struct drm_gem_object *obj, struct drm_file *file);
+
+ /**
+ * @close_object:
+ *
+ * Called upon GEM handle release.
+ *
+ * This callback is optional.
+ */
+ void (*close)(struct drm_gem_object *obj, struct drm_file *file);
+
+ /**
+ * @print_info:
+ *
+ * If driver subclasses struct &drm_gem_object, it can implement this
+ * optional hook for printing additional driver specific info.
+ *
+ * drm_printf_indent() should be used in the callback passing it the
+ * indent argument.
+ *
+ * This callback is called from drm_gem_print_info().
+ *
+ * This callback is optional.
+ */
+ void (*print_info)(struct drm_printer *p, unsigned int indent,
+ const struct drm_gem_object *obj);
+
+ /**
+ * @export:
+ *
+ * Export backing buffer as a &dma_buf.
+ * If this is not set drm_gem_prime_export() is used.
+ *
+ * This callback is optional.
+ */
+ struct dma_buf *(*export)(struct drm_gem_object *obj, int flags);
+
+ /*
+ * @pin:
+ *
+ * Pin backing buffer in memory.
+ *
+ * This callback is optional.
+ */
+ int (*pin)(struct drm_gem_object *obj);
+
+ /*
+ * @unpin:
+ *
+ * Unpin backing buffer.
+ *
+ * This callback is optional.
+ */
+ void (*unpin)(struct drm_gem_object *obj);
+
+ /*
+ * @get_sg_table:
+ *
+ * Returns a Scatter-Gather table representation of the buffer.
+ * Used when exporting a buffer.
+ *
+ * This callback is mandatory if buffer export is supported.
+ */
+ struct sg_table *(*get_sg_table)(struct drm_gem_object *obj);
+
+ /*
+ * @vmap:
+ *
+ * Returns a virtual address for the buffer.
+ *
+ * This callback is optional.
+ */
+ void *(*vmap)(struct drm_gem_object *obj);
+
+ /*
+ * @vunmap:
+ *
+ * Releases the the address previously returned by @vmap.
+ *
+ * This callback is optional.
+ */
+ void (*vunmap)(struct drm_gem_object *obj, void *vaddr);
+
+ /*
+ * @mmap:
+ *
+ * Setup userspace mapping with the given vma.
+ *
+ * This callback is optional.
+ */
+ int (*mmap)(struct drm_gem_object *obj, struct vm_area_struct *vma);
+
+ /**
+ * @vm_ops:
+ *
+ * Virtual memory operations used with mmap.
+ *
+ * This is optional but necessary for mmap support.
+ */
+ const struct vm_operations_struct *vm_ops;
+};
+
/**
* struct drm_gem_object - GEM buffer object
*
@@ -146,6 +270,15 @@ struct drm_gem_object {
* simply leave it as NULL.
*/
struct dma_buf_attachment *import_attach;
+
+ /*
+ * @funcs:
+ *
+ * Optional GEM object functions. If this is set, it will be used if the
+ * corresponding &drm_driver GEM callback is not set.
+ *
+ */
+ const struct drm_gem_object_funcs *funcs;
};
/**
@@ -293,4 +426,9 @@ int drm_gem_dumb_destroy(struct drm_file *file,
struct drm_device *dev,
uint32_t handle);
+int drm_gem_pin(struct drm_gem_object *obj);
+void drm_gem_unpin(struct drm_gem_object *obj);
+void *drm_gem_vmap(struct drm_gem_object *obj);
+void drm_gem_vunmap(struct drm_gem_object *obj, void *vaddr);
+
#endif /* __DRM_GEM_H__ */
--
2.15.1
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