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https://github.com/torvalds/linux
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0de23977cf
Use the new vma manager instead of the old hashtable. Also convert all drivers to use the new convenience helpers. This drops all the (map_list.hash.key << PAGE_SHIFT) non-sense. Locking and access-management is exactly the same as before with an additional lock inside of the vma-manager, which strictly wouldn't be needed for gem. v2: - rebase on drm-next - init nodes via drm_vma_node_reset() in drm_gem.c v3: - fix tegra v4: - remove duplicate if (drm_vma_node_has_offset()) checks - inline now trivial drm_vma_node_offset_addr() calls v5: - skip node-reset on gem-init due to kzalloc() - do not allow mapping gem-objects with offsets (backwards compat) - remove unneccessary casts Cc: Inki Dae <inki.dae@samsung.com> Cc: Rob Clark <robdclark@gmail.com> Cc: Dave Airlie <airlied@redhat.com> Cc: Thierry Reding <thierry.reding@gmail.com> Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Acked-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Dave Airlie <airlied@gmail.com>
125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
/*
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* drivers/gpu/drm/omapdrm/omap_gem_helpers.c
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*
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* Copyright (C) 2011 Texas Instruments
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* Author: Rob Clark <rob.clark@linaro.org>
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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 of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that 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, see <http://www.gnu.org/licenses/>.
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*/
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/* temporary copy of drm_gem_{get,put}_pages() until the
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* "drm/gem: add functions to get/put pages" patch is merged..
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/shmem_fs.h>
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#include <drm/drmP.h>
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/**
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* drm_gem_get_pages - helper to allocate backing pages for a GEM object
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* @obj: obj in question
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* @gfpmask: gfp mask of requested pages
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*/
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struct page **_drm_gem_get_pages(struct drm_gem_object *obj, gfp_t gfpmask)
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{
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struct inode *inode;
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struct address_space *mapping;
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struct page *p, **pages;
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int i, npages;
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/* This is the shared memory object that backs the GEM resource */
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inode = file_inode(obj->filp);
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mapping = inode->i_mapping;
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npages = obj->size >> PAGE_SHIFT;
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pages = drm_malloc_ab(npages, sizeof(struct page *));
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if (pages == NULL)
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return ERR_PTR(-ENOMEM);
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gfpmask |= mapping_gfp_mask(mapping);
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for (i = 0; i < npages; i++) {
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p = shmem_read_mapping_page_gfp(mapping, i, gfpmask);
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if (IS_ERR(p))
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goto fail;
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pages[i] = p;
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/* There is a hypothetical issue w/ drivers that require
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* buffer memory in the low 4GB.. if the pages are un-
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* pinned, and swapped out, they can end up swapped back
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* in above 4GB. If pages are already in memory, then
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* shmem_read_mapping_page_gfp will ignore the gfpmask,
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* even if the already in-memory page disobeys the mask.
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*
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* It is only a theoretical issue today, because none of
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* the devices with this limitation can be populated with
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* enough memory to trigger the issue. But this BUG_ON()
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* is here as a reminder in case the problem with
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* shmem_read_mapping_page_gfp() isn't solved by the time
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* it does become a real issue.
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*
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* See this thread: http://lkml.org/lkml/2011/7/11/238
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*/
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BUG_ON((gfpmask & __GFP_DMA32) &&
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(page_to_pfn(p) >= 0x00100000UL));
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}
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return pages;
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fail:
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while (i--)
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page_cache_release(pages[i]);
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drm_free_large(pages);
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return ERR_CAST(p);
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}
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/**
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* drm_gem_put_pages - helper to free backing pages for a GEM object
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* @obj: obj in question
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* @pages: pages to free
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*/
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void _drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
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bool dirty, bool accessed)
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{
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int i, npages;
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npages = obj->size >> PAGE_SHIFT;
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for (i = 0; i < npages; i++) {
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if (dirty)
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set_page_dirty(pages[i]);
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if (accessed)
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mark_page_accessed(pages[i]);
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/* Undo the reference we took when populating the table */
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page_cache_release(pages[i]);
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}
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drm_free_large(pages);
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}
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int
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_drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size)
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{
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struct drm_device *dev = obj->dev;
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struct drm_gem_mm *mm = dev->mm_private;
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return drm_vma_offset_add(&mm->vma_manager, &obj->vma_node,
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size / PAGE_SIZE);
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}
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