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![Qian Cai](/assets/img/avatar_default.png)
The opening comment mark "/**" is reserved for kernel-doc comments, so it will generate warnings for comments that are not kernel-doc with "make W=1". For example, drivers/gpu/drm/drm_memory.c:2: warning: Cannot understand * \file drm_memory.c Signed-off-by: Qian Cai <cai@lca.pw> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/1563198173-7317-1-git-send-email-cai@lca.pw
226 lines
5.5 KiB
C
226 lines
5.5 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/mm.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <drm/drm.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_print.h>
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#include "drm_legacy.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, pgprot_noncached_wc(PAGE_KERNEL));
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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_LEGACY)) {
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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_legacy_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_LEGACY))
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return -EOPNOTSUPP;
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if (!drm_core_check_feature(dev, DRIVER_SG))
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return -EOPNOTSUPP;
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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_legacy_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_LEGACY))
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return -EOPNOTSUPP;
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if (!drm_core_check_feature(dev, DRIVER_SG))
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return -EOPNOTSUPP;
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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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