229 lines
6.7 KiB
C
229 lines
6.7 KiB
C
/*
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* psb GEM interface
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*
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* Copyright (c) 2011, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Authors: Alan Cox
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*
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* TODO:
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* - we need to work out if the MMU is relevant (eg for
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* accelerated operations on a GEM object)
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*/
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#include <drm/drmP.h>
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#include <drm/drm.h>
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#include <drm/gma_drm.h>
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#include <drm/drm_vma_manager.h>
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#include "psb_drv.h"
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void psb_gem_free_object(struct drm_gem_object *obj)
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{
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struct gtt_range *gtt = container_of(obj, struct gtt_range, gem);
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/* Remove the list map if one is present */
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drm_gem_free_mmap_offset(obj);
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drm_gem_object_release(obj);
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/* This must occur last as it frees up the memory of the GEM object */
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psb_gtt_free_range(obj->dev, gtt);
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}
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int psb_gem_get_aperture(struct drm_device *dev, void *data,
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struct drm_file *file)
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{
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return -EINVAL;
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}
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/**
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* psb_gem_dumb_map_gtt - buffer mapping for dumb interface
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* @file: our drm client file
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* @dev: drm device
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* @handle: GEM handle to the object (from dumb_create)
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*
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* Do the necessary setup to allow the mapping of the frame buffer
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* into user memory. We don't have to do much here at the moment.
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*/
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int psb_gem_dumb_map_gtt(struct drm_file *file, struct drm_device *dev,
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uint32_t handle, uint64_t *offset)
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{
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int ret = 0;
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struct drm_gem_object *obj;
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mutex_lock(&dev->struct_mutex);
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/* GEM does all our handle to object mapping */
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obj = drm_gem_object_lookup(dev, file, handle);
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if (obj == NULL) {
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ret = -ENOENT;
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goto unlock;
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}
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/* What validation is needed here ? */
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/* Make it mmapable */
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ret = drm_gem_create_mmap_offset(obj);
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if (ret)
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goto out;
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*offset = drm_vma_node_offset_addr(&obj->vma_node);
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out:
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drm_gem_object_unreference(obj);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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/**
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* psb_gem_create - create a mappable object
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* @file: the DRM file of the client
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* @dev: our device
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* @size: the size requested
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* @handlep: returned handle (opaque number)
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*
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* Create a GEM object, fill in the boilerplate and attach a handle to
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* it so that userspace can speak about it. This does the core work
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* for the various methods that do/will create GEM objects for things
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*/
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int psb_gem_create(struct drm_file *file, struct drm_device *dev, u64 size,
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u32 *handlep, int stolen, u32 align)
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{
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struct gtt_range *r;
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int ret;
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u32 handle;
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size = roundup(size, PAGE_SIZE);
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/* Allocate our object - for now a direct gtt range which is not
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stolen memory backed */
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r = psb_gtt_alloc_range(dev, size, "gem", 0, PAGE_SIZE);
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if (r == NULL) {
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dev_err(dev->dev, "no memory for %lld byte GEM object\n", size);
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return -ENOSPC;
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}
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/* Initialize the extra goodies GEM needs to do all the hard work */
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if (drm_gem_object_init(dev, &r->gem, size) != 0) {
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psb_gtt_free_range(dev, r);
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/* GEM doesn't give an error code so use -ENOMEM */
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dev_err(dev->dev, "GEM init failed for %lld\n", size);
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return -ENOMEM;
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}
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/* Limit the object to 32bit mappings */
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mapping_set_gfp_mask(r->gem.filp->f_mapping, GFP_KERNEL | __GFP_DMA32);
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/* Give the object a handle so we can carry it more easily */
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ret = drm_gem_handle_create(file, &r->gem, &handle);
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if (ret) {
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dev_err(dev->dev, "GEM handle failed for %p, %lld\n",
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&r->gem, size);
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drm_gem_object_release(&r->gem);
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psb_gtt_free_range(dev, r);
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return ret;
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}
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/* We have the initial and handle reference but need only one now */
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drm_gem_object_unreference(&r->gem);
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*handlep = handle;
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return 0;
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}
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/**
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* psb_gem_dumb_create - create a dumb buffer
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* @drm_file: our client file
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* @dev: our device
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* @args: the requested arguments copied from userspace
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*
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* Allocate a buffer suitable for use for a frame buffer of the
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* form described by user space. Give userspace a handle by which
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* to reference it.
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*/
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int psb_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
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struct drm_mode_create_dumb *args)
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{
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args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64);
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args->size = args->pitch * args->height;
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return psb_gem_create(file, dev, args->size, &args->handle, 0,
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PAGE_SIZE);
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}
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/**
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* psb_gem_fault - pagefault handler for GEM objects
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* @vma: the VMA of the GEM object
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* @vmf: fault detail
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*
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* Invoked when a fault occurs on an mmap of a GEM managed area. GEM
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* does most of the work for us including the actual map/unmap calls
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* but we need to do the actual page work.
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*
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* This code eventually needs to handle faulting objects in and out
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* of the GTT and repacking it when we run out of space. We can put
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* that off for now and for our simple uses
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*
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* The VMA was set up by GEM. In doing so it also ensured that the
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* vma->vm_private_data points to the GEM object that is backing this
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* mapping.
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*/
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int psb_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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struct drm_gem_object *obj;
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struct gtt_range *r;
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int ret;
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unsigned long pfn;
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pgoff_t page_offset;
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struct drm_device *dev;
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struct drm_psb_private *dev_priv;
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obj = vma->vm_private_data; /* GEM object */
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dev = obj->dev;
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dev_priv = dev->dev_private;
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r = container_of(obj, struct gtt_range, gem); /* Get the gtt range */
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/* Make sure we don't parallel update on a fault, nor move or remove
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something from beneath our feet */
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mutex_lock(&dev->struct_mutex);
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/* For now the mmap pins the object and it stays pinned. As things
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stand that will do us no harm */
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if (r->mmapping == 0) {
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ret = psb_gtt_pin(r);
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if (ret < 0) {
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dev_err(dev->dev, "gma500: pin failed: %d\n", ret);
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goto fail;
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}
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r->mmapping = 1;
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}
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/* Page relative to the VMA start - we must calculate this ourselves
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because vmf->pgoff is the fake GEM offset */
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page_offset = ((unsigned long) vmf->virtual_address - vma->vm_start)
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>> PAGE_SHIFT;
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/* CPU view of the page, don't go via the GART for CPU writes */
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if (r->stolen)
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pfn = (dev_priv->stolen_base + r->offset) >> PAGE_SHIFT;
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else
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pfn = page_to_pfn(r->pages[page_offset]);
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ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
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fail:
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mutex_unlock(&dev->struct_mutex);
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switch (ret) {
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case 0:
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case -ERESTARTSYS:
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case -EINTR:
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return VM_FAULT_NOPAGE;
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case -ENOMEM:
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return VM_FAULT_OOM;
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default:
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return VM_FAULT_SIGBUS;
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}
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}
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