gma500: GEM and GEM glue
The driver uses GEM along with a couple of small bits of wrapping of its own. The only real oddity here is the support for using the 'stolen' memory rather than wasting several MB. We use a simple resource manager as we don't need to manage our space intensively at all as we only do 2D work. We also have a GTT which is entirely GPU facing so in the Cedarview case are not even allocating from host address space. Signed-off-by: Alan Cox <alan@linux.intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
parent
3abcf41fb1
commit
e32681d66d
3 changed files with 386 additions and 0 deletions
295
drivers/gpu/drm/gma500/gem.c
Normal file
295
drivers/gpu/drm/gma500/gem.c
Normal file
|
@ -0,0 +1,295 @@
|
|||
/*
|
||||
* psb GEM interface
|
||||
*
|
||||
* Copyright (c) 2011, Intel Corporation.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms and conditions of the GNU General Public License,
|
||||
* version 2, as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope 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, write to the Free Software Foundation, Inc.,
|
||||
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
|
||||
*
|
||||
* Authors: Alan Cox
|
||||
*
|
||||
* TODO:
|
||||
* - we need to work out if the MMU is relevant (eg for
|
||||
* accelerated operations on a GEM object)
|
||||
*/
|
||||
|
||||
#include <drm/drmP.h>
|
||||
#include <drm/drm.h>
|
||||
#include "psb_drm.h"
|
||||
#include "psb_drv.h"
|
||||
|
||||
int psb_gem_init_object(struct drm_gem_object *obj)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
void psb_gem_free_object(struct drm_gem_object *obj)
|
||||
{
|
||||
struct gtt_range *gtt = container_of(obj, struct gtt_range, gem);
|
||||
drm_gem_object_release_wrap(obj);
|
||||
/* This must occur last as it frees up the memory of the GEM object */
|
||||
psb_gtt_free_range(obj->dev, gtt);
|
||||
}
|
||||
|
||||
int psb_gem_get_aperture(struct drm_device *dev, void *data,
|
||||
struct drm_file *file)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/**
|
||||
* psb_gem_dumb_map_gtt - buffer mapping for dumb interface
|
||||
* @file: our drm client file
|
||||
* @dev: drm device
|
||||
* @handle: GEM handle to the object (from dumb_create)
|
||||
*
|
||||
* Do the necessary setup to allow the mapping of the frame buffer
|
||||
* into user memory. We don't have to do much here at the moment.
|
||||
*/
|
||||
int psb_gem_dumb_map_gtt(struct drm_file *file, struct drm_device *dev,
|
||||
uint32_t handle, uint64_t *offset)
|
||||
{
|
||||
int ret = 0;
|
||||
struct drm_gem_object *obj;
|
||||
|
||||
if (!(dev->driver->driver_features & DRIVER_GEM))
|
||||
return -ENODEV;
|
||||
|
||||
mutex_lock(&dev->struct_mutex);
|
||||
|
||||
/* GEM does all our handle to object mapping */
|
||||
obj = drm_gem_object_lookup(dev, file, handle);
|
||||
if (obj == NULL) {
|
||||
ret = -ENOENT;
|
||||
goto unlock;
|
||||
}
|
||||
/* What validation is needed here ? */
|
||||
|
||||
/* Make it mmapable */
|
||||
if (!obj->map_list.map) {
|
||||
ret = gem_create_mmap_offset(obj);
|
||||
if (ret)
|
||||
goto out;
|
||||
}
|
||||
/* GEM should really work out the hash offsets for us */
|
||||
*offset = (u64)obj->map_list.hash.key << PAGE_SHIFT;
|
||||
out:
|
||||
drm_gem_object_unreference(obj);
|
||||
unlock:
|
||||
mutex_unlock(&dev->struct_mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* psb_gem_create - create a mappable object
|
||||
* @file: the DRM file of the client
|
||||
* @dev: our device
|
||||
* @size: the size requested
|
||||
* @handlep: returned handle (opaque number)
|
||||
*
|
||||
* Create a GEM object, fill in the boilerplate and attach a handle to
|
||||
* it so that userspace can speak about it. This does the core work
|
||||
* for the various methods that do/will create GEM objects for things
|
||||
*/
|
||||
static int psb_gem_create(struct drm_file *file,
|
||||
struct drm_device *dev, uint64_t size, uint32_t *handlep)
|
||||
{
|
||||
struct gtt_range *r;
|
||||
int ret;
|
||||
u32 handle;
|
||||
|
||||
size = roundup(size, PAGE_SIZE);
|
||||
|
||||
/* Allocate our object - for now a direct gtt range which is not
|
||||
stolen memory backed */
|
||||
r = psb_gtt_alloc_range(dev, size, "gem", 0);
|
||||
if (r == NULL) {
|
||||
dev_err(dev->dev, "no memory for %lld byte GEM object\n", size);
|
||||
return -ENOSPC;
|
||||
}
|
||||
/* Initialize the extra goodies GEM needs to do all the hard work */
|
||||
if (drm_gem_object_init(dev, &r->gem, size) != 0) {
|
||||
psb_gtt_free_range(dev, r);
|
||||
/* GEM doesn't give an error code and we don't have an
|
||||
EGEMSUCKS so make something up for now - FIXME */
|
||||
dev_err(dev->dev, "GEM init failed for %lld\n", size);
|
||||
return -ENOMEM;
|
||||
}
|
||||
/* Give the object a handle so we can carry it more easily */
|
||||
ret = drm_gem_handle_create(file, &r->gem, &handle);
|
||||
if (ret) {
|
||||
dev_err(dev->dev, "GEM handle failed for %p, %lld\n",
|
||||
&r->gem, size);
|
||||
drm_gem_object_release(&r->gem);
|
||||
psb_gtt_free_range(dev, r);
|
||||
return ret;
|
||||
}
|
||||
/* We have the initial and handle reference but need only one now */
|
||||
drm_gem_object_unreference(&r->gem);
|
||||
*handlep = handle;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* psb_gem_dumb_create - create a dumb buffer
|
||||
* @drm_file: our client file
|
||||
* @dev: our device
|
||||
* @args: the requested arguments copied from userspace
|
||||
*
|
||||
* Allocate a buffer suitable for use for a frame buffer of the
|
||||
* form described by user space. Give userspace a handle by which
|
||||
* to reference it.
|
||||
*/
|
||||
int psb_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
|
||||
struct drm_mode_create_dumb *args)
|
||||
{
|
||||
args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64);
|
||||
args->size = args->pitch * args->height;
|
||||
return psb_gem_create(file, dev, args->size, &args->handle);
|
||||
}
|
||||
|
||||
/**
|
||||
* psb_gem_dumb_destroy - destroy a dumb buffer
|
||||
* @file: client file
|
||||
* @dev: our DRM device
|
||||
* @handle: the object handle
|
||||
*
|
||||
* Destroy a handle that was created via psb_gem_dumb_create, at least
|
||||
* we hope it was created that way. i915 seems to assume the caller
|
||||
* does the checking but that might be worth review ! FIXME
|
||||
*/
|
||||
int psb_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev,
|
||||
uint32_t handle)
|
||||
{
|
||||
/* No special work needed, drop the reference and see what falls out */
|
||||
return drm_gem_handle_delete(file, handle);
|
||||
}
|
||||
|
||||
/**
|
||||
* psb_gem_fault - pagefault handler for GEM objects
|
||||
* @vma: the VMA of the GEM object
|
||||
* @vmf: fault detail
|
||||
*
|
||||
* Invoked when a fault occurs on an mmap of a GEM managed area. GEM
|
||||
* does most of the work for us including the actual map/unmap calls
|
||||
* but we need to do the actual page work.
|
||||
*
|
||||
* This code eventually needs to handle faulting objects in and out
|
||||
* of the GTT and repacking it when we run out of space. We can put
|
||||
* that off for now and for our simple uses
|
||||
*
|
||||
* The VMA was set up by GEM. In doing so it also ensured that the
|
||||
* vma->vm_private_data points to the GEM object that is backing this
|
||||
* mapping.
|
||||
*
|
||||
* FIXME
|
||||
*/
|
||||
int psb_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
||||
{
|
||||
struct drm_gem_object *obj;
|
||||
struct gtt_range *r;
|
||||
int ret;
|
||||
unsigned long pfn;
|
||||
pgoff_t page_offset;
|
||||
struct drm_device *dev;
|
||||
struct drm_psb_private *dev_priv;
|
||||
|
||||
obj = vma->vm_private_data; /* GEM object */
|
||||
dev = obj->dev;
|
||||
dev_priv = dev->dev_private;
|
||||
|
||||
r = container_of(obj, struct gtt_range, gem); /* Get the gtt range */
|
||||
|
||||
/* Make sure we don't parallel update on a fault, nor move or remove
|
||||
something from beneath our feet */
|
||||
mutex_lock(&dev->struct_mutex);
|
||||
|
||||
/* For now the mmap pins the object and it stays pinned. As things
|
||||
stand that will do us no harm */
|
||||
if (r->mmapping == 0) {
|
||||
ret = psb_gtt_pin(r);
|
||||
if (ret < 0) {
|
||||
dev_err(dev->dev, "gma500: pin failed: %d\n", ret);
|
||||
goto fail;
|
||||
}
|
||||
r->mmapping = 1;
|
||||
}
|
||||
|
||||
/* Page relative to the VMA start - we must calculate this ourselves
|
||||
because vmf->pgoff is the fake GEM offset */
|
||||
page_offset = ((unsigned long) vmf->virtual_address - vma->vm_start)
|
||||
>> PAGE_SHIFT;
|
||||
|
||||
/* CPU view of the page, don't go via the GART for CPU writes */
|
||||
if (r->stolen)
|
||||
pfn = (dev_priv->stolen_base + r->offset) >> PAGE_SHIFT;
|
||||
else
|
||||
pfn = page_to_pfn(r->pages[page_offset]);
|
||||
ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
|
||||
|
||||
fail:
|
||||
mutex_unlock(&dev->struct_mutex);
|
||||
switch (ret) {
|
||||
case 0:
|
||||
case -ERESTARTSYS:
|
||||
case -EINTR:
|
||||
return VM_FAULT_NOPAGE;
|
||||
case -ENOMEM:
|
||||
return VM_FAULT_OOM;
|
||||
default:
|
||||
return VM_FAULT_SIGBUS;
|
||||
}
|
||||
}
|
||||
|
||||
static int psb_gem_create_stolen(struct drm_file *file, struct drm_device *dev,
|
||||
int size, u32 *handle)
|
||||
{
|
||||
struct gtt_range *gtt = psb_gtt_alloc_range(dev, size, "gem", 1);
|
||||
if (gtt == NULL)
|
||||
return -ENOMEM;
|
||||
if (drm_gem_private_object_init(dev, >t->gem, size) != 0)
|
||||
goto free_gtt;
|
||||
if (drm_gem_handle_create(file, >t->gem, handle) == 0)
|
||||
return 0;
|
||||
free_gtt:
|
||||
psb_gtt_free_range(dev, gtt);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
/*
|
||||
* GEM interfaces for our specific client
|
||||
*/
|
||||
int psb_gem_create_ioctl(struct drm_device *dev, void *data,
|
||||
struct drm_file *file)
|
||||
{
|
||||
struct drm_psb_gem_create *args = data;
|
||||
int ret;
|
||||
if (args->flags & PSB_GEM_CREATE_STOLEN) {
|
||||
ret = psb_gem_create_stolen(file, dev, args->size,
|
||||
&args->handle);
|
||||
if (ret == 0)
|
||||
return 0;
|
||||
/* Fall throguh */
|
||||
args->flags &= ~PSB_GEM_CREATE_STOLEN;
|
||||
}
|
||||
return psb_gem_create(file, dev, args->size, &args->handle);
|
||||
}
|
||||
|
||||
int psb_gem_mmap_ioctl(struct drm_device *dev, void *data,
|
||||
struct drm_file *file)
|
||||
{
|
||||
struct drm_psb_gem_mmap *args = data;
|
||||
return dev->driver->dumb_map_offset(file, dev,
|
||||
args->handle, &args->offset);
|
||||
}
|
||||
|
89
drivers/gpu/drm/gma500/gem_glue.c
Normal file
89
drivers/gpu/drm/gma500/gem_glue.c
Normal file
|
@ -0,0 +1,89 @@
|
|||
/**************************************************************************
|
||||
* Copyright (c) 2011, Intel Corporation.
|
||||
* All Rights Reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms and conditions of the GNU General Public License,
|
||||
* version 2, as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope 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, write to the Free Software Foundation, Inc.,
|
||||
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
|
||||
*
|
||||
**************************************************************************/
|
||||
|
||||
#include <drm/drmP.h>
|
||||
#include <drm/drm.h>
|
||||
|
||||
void drm_gem_object_release_wrap(struct drm_gem_object *obj)
|
||||
{
|
||||
/* Remove the list map if one is present */
|
||||
if (obj->map_list.map) {
|
||||
struct drm_gem_mm *mm = obj->dev->mm_private;
|
||||
struct drm_map_list *list = &obj->map_list;
|
||||
drm_ht_remove_item(&mm->offset_hash, &list->hash);
|
||||
drm_mm_put_block(list->file_offset_node);
|
||||
kfree(list->map);
|
||||
list->map = NULL;
|
||||
}
|
||||
drm_gem_object_release(obj);
|
||||
}
|
||||
|
||||
/**
|
||||
* gem_create_mmap_offset - invent an mmap offset
|
||||
* @obj: our object
|
||||
*
|
||||
* Standard implementation of offset generation for mmap as is
|
||||
* duplicated in several drivers. This belongs in GEM.
|
||||
*/
|
||||
int gem_create_mmap_offset(struct drm_gem_object *obj)
|
||||
{
|
||||
struct drm_device *dev = obj->dev;
|
||||
struct drm_gem_mm *mm = dev->mm_private;
|
||||
struct drm_map_list *list;
|
||||
struct drm_local_map *map;
|
||||
int ret;
|
||||
|
||||
list = &obj->map_list;
|
||||
list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL);
|
||||
if (list->map == NULL)
|
||||
return -ENOMEM;
|
||||
map = list->map;
|
||||
map->type = _DRM_GEM;
|
||||
map->size = obj->size;
|
||||
map->handle = obj;
|
||||
|
||||
list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
|
||||
obj->size / PAGE_SIZE, 0, 0);
|
||||
if (!list->file_offset_node) {
|
||||
dev_err(dev->dev, "failed to allocate offset for bo %d\n",
|
||||
obj->name);
|
||||
ret = -ENOSPC;
|
||||
goto free_it;
|
||||
}
|
||||
list->file_offset_node = drm_mm_get_block(list->file_offset_node,
|
||||
obj->size / PAGE_SIZE, 0);
|
||||
if (!list->file_offset_node) {
|
||||
ret = -ENOMEM;
|
||||
goto free_it;
|
||||
}
|
||||
list->hash.key = list->file_offset_node->start;
|
||||
ret = drm_ht_insert_item(&mm->offset_hash, &list->hash);
|
||||
if (ret) {
|
||||
dev_err(dev->dev, "failed to add to map hash\n");
|
||||
goto free_mm;
|
||||
}
|
||||
return 0;
|
||||
|
||||
free_mm:
|
||||
drm_mm_put_block(list->file_offset_node);
|
||||
free_it:
|
||||
kfree(list->map);
|
||||
list->map = NULL;
|
||||
return ret;
|
||||
}
|
2
drivers/gpu/drm/gma500/gem_glue.h
Normal file
2
drivers/gpu/drm/gma500/gem_glue.h
Normal file
|
@ -0,0 +1,2 @@
|
|||
extern void drm_gem_object_release_wrap(struct drm_gem_object *obj);
|
||||
extern int gem_create_mmap_offset(struct drm_gem_object *obj);
|
Reference in a new issue