![Souptick Joarder](/assets/img/avatar_default.png)
Use new return type vm_fault_t for fault handler. For now, this is just
documenting that the function returns a VM_FAULT value rather than an
errno. Once all instances are converted, vm_fault_t will become a
distinct type.
Ref-> 1c8f422059
("mm: change return type to vm_fault_t")
Previously vm_insert_{pfn,mixed} returns err which driver mapped into
VM_FAULT_* type. The new function vmf_insert_{pfn,mixed} will replace
this inefficiency by returning VM_FAULT_* type.
vmf_error() is the newly introduce inline function in 4.17-rc6.
Link: http://lkml.kernel.org/r/20180713154541.GA3345@jordon-HP-15-Notebook-PC
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
186 lines
5.6 KiB
C
186 lines
5.6 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_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_put_unlocked(&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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vm_fault_t psb_gem_fault(struct vm_fault *vmf)
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{
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struct vm_area_struct *vma = vmf->vma;
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struct drm_gem_object *obj;
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struct gtt_range *r;
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int err;
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vm_fault_t 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_priv->mmap_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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err = psb_gtt_pin(r);
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if (err < 0) {
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dev_err(dev->dev, "gma500: pin failed: %d\n", err);
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ret = vmf_error(err);
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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 = (vmf->address - vma->vm_start) >> 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 = vmf_insert_pfn(vma, vmf->address, pfn);
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fail:
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mutex_unlock(&dev_priv->mmap_mutex);
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return ret;
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}
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