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![Daniel Vetter](/assets/img/avatar_default.png)
Only the radeon/r128/ati ums drivers use this. Furthermore the cleanup was already only done for UMS drivers. Also a quick check of the ATI ddx git history shows that only the UMS code ever used this facility. So we can safely disallow these pair of ioctls for modesetting drivers. Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Dave Airlie <airlied@redhat.com>
220 lines
5.4 KiB
C
220 lines
5.4 KiB
C
/**
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* \file drm_scatter.c
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* IOCTLs to manage scatter/gather memory
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*
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
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*
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <drm/drmP.h>
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#define DEBUG_SCATTER 0
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static inline void *drm_vmalloc_dma(unsigned long size)
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{
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#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
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return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL | _PAGE_NO_CACHE);
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#else
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return vmalloc_32(size);
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#endif
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}
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static void drm_sg_cleanup(struct drm_sg_mem * entry)
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{
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struct page *page;
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int i;
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for (i = 0; i < entry->pages; i++) {
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page = entry->pagelist[i];
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if (page)
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ClearPageReserved(page);
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}
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vfree(entry->virtual);
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kfree(entry->busaddr);
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kfree(entry->pagelist);
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kfree(entry);
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}
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void drm_legacy_sg_cleanup(struct drm_device *dev)
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{
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if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
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!drm_core_check_feature(dev, DRIVER_MODESET)) {
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drm_sg_cleanup(dev->sg);
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dev->sg = NULL;
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}
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}
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#ifdef _LP64
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# define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1)))
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#else
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# define ScatterHandle(x) (unsigned int)(x)
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#endif
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int drm_sg_alloc(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_scatter_gather *request = data;
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struct drm_sg_mem *entry;
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unsigned long pages, i, j;
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DRM_DEBUG("\n");
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if (drm_core_check_feature(dev, DRIVER_MODESET))
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return -EINVAL;
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if (!drm_core_check_feature(dev, DRIVER_SG))
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return -EINVAL;
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if (dev->sg)
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return -EINVAL;
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entry = kzalloc(sizeof(*entry), GFP_KERNEL);
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if (!entry)
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return -ENOMEM;
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pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
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DRM_DEBUG("size=%ld pages=%ld\n", request->size, pages);
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entry->pages = pages;
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entry->pagelist = kcalloc(pages, sizeof(*entry->pagelist), GFP_KERNEL);
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if (!entry->pagelist) {
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kfree(entry);
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return -ENOMEM;
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}
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entry->busaddr = kcalloc(pages, sizeof(*entry->busaddr), GFP_KERNEL);
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if (!entry->busaddr) {
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kfree(entry->pagelist);
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kfree(entry);
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return -ENOMEM;
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}
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entry->virtual = drm_vmalloc_dma(pages << PAGE_SHIFT);
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if (!entry->virtual) {
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kfree(entry->busaddr);
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kfree(entry->pagelist);
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kfree(entry);
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return -ENOMEM;
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}
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/* This also forces the mapping of COW pages, so our page list
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* will be valid. Please don't remove it...
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*/
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memset(entry->virtual, 0, pages << PAGE_SHIFT);
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entry->handle = ScatterHandle((unsigned long)entry->virtual);
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DRM_DEBUG("handle = %08lx\n", entry->handle);
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DRM_DEBUG("virtual = %p\n", entry->virtual);
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for (i = (unsigned long)entry->virtual, j = 0; j < pages;
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i += PAGE_SIZE, j++) {
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entry->pagelist[j] = vmalloc_to_page((void *)i);
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if (!entry->pagelist[j])
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goto failed;
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SetPageReserved(entry->pagelist[j]);
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}
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request->handle = entry->handle;
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dev->sg = entry;
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#if DEBUG_SCATTER
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/* Verify that each page points to its virtual address, and vice
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* versa.
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*/
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{
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int error = 0;
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for (i = 0; i < pages; i++) {
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unsigned long *tmp;
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tmp = page_address(entry->pagelist[i]);
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for (j = 0;
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j < PAGE_SIZE / sizeof(unsigned long);
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j++, tmp++) {
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*tmp = 0xcafebabe;
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}
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tmp = (unsigned long *)((u8 *) entry->virtual +
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(PAGE_SIZE * i));
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for (j = 0;
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j < PAGE_SIZE / sizeof(unsigned long);
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j++, tmp++) {
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if (*tmp != 0xcafebabe && error == 0) {
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error = 1;
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DRM_ERROR("Scatter allocation error, "
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"pagelist does not match "
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"virtual mapping\n");
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}
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}
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tmp = page_address(entry->pagelist[i]);
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for (j = 0;
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j < PAGE_SIZE / sizeof(unsigned long);
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j++, tmp++) {
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*tmp = 0;
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}
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}
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if (error == 0)
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DRM_ERROR("Scatter allocation matches pagelist\n");
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}
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#endif
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return 0;
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failed:
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drm_sg_cleanup(entry);
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return -ENOMEM;
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}
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int drm_sg_free(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_scatter_gather *request = data;
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struct drm_sg_mem *entry;
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if (drm_core_check_feature(dev, DRIVER_MODESET))
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return -EINVAL;
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if (!drm_core_check_feature(dev, DRIVER_SG))
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return -EINVAL;
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entry = dev->sg;
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dev->sg = NULL;
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if (!entry || entry->handle != request->handle)
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return -EINVAL;
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DRM_DEBUG("virtual = %p\n", entry->virtual);
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drm_sg_cleanup(entry);
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return 0;
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}
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