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36b73b051c
We have DRM drivers based on USB, SPI and platform devices. All of them are fine with storing their device reference in struct drm_device.dev. PCI devices should be no exception. Therefore struct drm_device.pdev is deprecated. Instead upcast from struct drm_device.dev with to_pci_dev(). PCI-specific code can use dev_is_pci() to test for a PCI device. This patch changes the DRM core code and documentation accordingly. v4: * split-off pdev deprecation into separate patch Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Acked-by: Sam Ravnborg <sam@ravnborg.org> Tested-by: Andy Lavr <andy.lavr@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210118131420.15874-2-tzimmermann@suse.de
668 lines
17 KiB
C
668 lines
17 KiB
C
/*
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* \file drm_vm.c
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* Memory mapping for DRM
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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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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* VA LINUX SYSTEMS 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
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/export.h>
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#include <linux/pci.h>
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#include <linux/seq_file.h>
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#include <linux/vmalloc.h>
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#include <linux/pgtable.h>
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#if defined(__ia64__)
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#include <linux/efi.h>
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#include <linux/slab.h>
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#endif
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#include <linux/mem_encrypt.h>
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#include <drm/drm_agpsupport.h>
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#include <drm/drm_device.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_file.h>
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#include <drm/drm_framebuffer.h>
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#include <drm/drm_print.h>
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#include "drm_internal.h"
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#include "drm_legacy.h"
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struct drm_vma_entry {
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struct list_head head;
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struct vm_area_struct *vma;
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pid_t pid;
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};
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static void drm_vm_open(struct vm_area_struct *vma);
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static void drm_vm_close(struct vm_area_struct *vma);
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static pgprot_t drm_io_prot(struct drm_local_map *map,
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struct vm_area_struct *vma)
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{
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pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
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#if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) || \
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defined(__mips__)
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if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))
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tmp = pgprot_noncached(tmp);
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else
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tmp = pgprot_writecombine(tmp);
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#elif defined(__ia64__)
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if (efi_range_is_wc(vma->vm_start, vma->vm_end -
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vma->vm_start))
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tmp = pgprot_writecombine(tmp);
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else
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tmp = pgprot_noncached(tmp);
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#elif defined(__sparc__) || defined(__arm__)
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tmp = pgprot_noncached(tmp);
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#endif
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return tmp;
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}
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static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
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{
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pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
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#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
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tmp = pgprot_noncached_wc(tmp);
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#endif
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return tmp;
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}
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/*
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* \c fault method for AGP virtual memory.
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*
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* \param vma virtual memory area.
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* \param address access address.
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* \return pointer to the page structure.
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*
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* Find the right map and if it's AGP memory find the real physical page to
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* map, get the page, increment the use count and return it.
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*/
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#if IS_ENABLED(CONFIG_AGP)
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static vm_fault_t drm_vm_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_file *priv = vma->vm_file->private_data;
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struct drm_device *dev = priv->minor->dev;
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struct drm_local_map *map = NULL;
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struct drm_map_list *r_list;
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struct drm_hash_item *hash;
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/*
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* Find the right map
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*/
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if (!dev->agp)
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goto vm_fault_error;
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if (!dev->agp || !dev->agp->cant_use_aperture)
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goto vm_fault_error;
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if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
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goto vm_fault_error;
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r_list = drm_hash_entry(hash, struct drm_map_list, hash);
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map = r_list->map;
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if (map && map->type == _DRM_AGP) {
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/*
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* Using vm_pgoff as a selector forces us to use this unusual
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* addressing scheme.
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*/
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resource_size_t offset = vmf->address - vma->vm_start;
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resource_size_t baddr = map->offset + offset;
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struct drm_agp_mem *agpmem;
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struct page *page;
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#ifdef __alpha__
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/*
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* Adjust to a bus-relative address
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*/
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baddr -= dev->hose->mem_space->start;
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#endif
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/*
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* It's AGP memory - find the real physical page to map
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*/
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list_for_each_entry(agpmem, &dev->agp->memory, head) {
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if (agpmem->bound <= baddr &&
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agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
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break;
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}
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if (&agpmem->head == &dev->agp->memory)
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goto vm_fault_error;
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/*
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* Get the page, inc the use count, and return it
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*/
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offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
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page = agpmem->memory->pages[offset];
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get_page(page);
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vmf->page = page;
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DRM_DEBUG
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("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
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(unsigned long long)baddr,
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agpmem->memory->pages[offset],
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(unsigned long long)offset,
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page_count(page));
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return 0;
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}
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vm_fault_error:
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return VM_FAULT_SIGBUS; /* Disallow mremap */
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}
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#else
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static vm_fault_t drm_vm_fault(struct vm_fault *vmf)
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{
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return VM_FAULT_SIGBUS;
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}
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#endif
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/*
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* \c nopage method for shared virtual memory.
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*
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* \param vma virtual memory area.
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* \param address access address.
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* \return pointer to the page structure.
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*
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* Get the mapping, find the real physical page to map, get the page, and
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* return it.
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*/
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static vm_fault_t drm_vm_shm_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_local_map *map = vma->vm_private_data;
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unsigned long offset;
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unsigned long i;
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struct page *page;
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if (!map)
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return VM_FAULT_SIGBUS; /* Nothing allocated */
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offset = vmf->address - vma->vm_start;
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i = (unsigned long)map->handle + offset;
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page = vmalloc_to_page((void *)i);
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if (!page)
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return VM_FAULT_SIGBUS;
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get_page(page);
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vmf->page = page;
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DRM_DEBUG("shm_fault 0x%lx\n", offset);
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return 0;
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}
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/*
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* \c close method for shared virtual memory.
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*
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* \param vma virtual memory area.
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*
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* Deletes map information if we are the last
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* person to close a mapping and it's not in the global maplist.
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*/
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static void drm_vm_shm_close(struct vm_area_struct *vma)
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{
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struct drm_file *priv = vma->vm_file->private_data;
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struct drm_device *dev = priv->minor->dev;
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struct drm_vma_entry *pt, *temp;
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struct drm_local_map *map;
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struct drm_map_list *r_list;
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int found_maps = 0;
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DRM_DEBUG("0x%08lx,0x%08lx\n",
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vma->vm_start, vma->vm_end - vma->vm_start);
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map = vma->vm_private_data;
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mutex_lock(&dev->struct_mutex);
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list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
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if (pt->vma->vm_private_data == map)
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found_maps++;
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if (pt->vma == vma) {
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list_del(&pt->head);
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kfree(pt);
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}
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}
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/* We were the only map that was found */
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if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
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/* Check to see if we are in the maplist, if we are not, then
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* we delete this mappings information.
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*/
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found_maps = 0;
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list_for_each_entry(r_list, &dev->maplist, head) {
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if (r_list->map == map)
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found_maps++;
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}
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if (!found_maps) {
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switch (map->type) {
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case _DRM_REGISTERS:
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case _DRM_FRAME_BUFFER:
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arch_phys_wc_del(map->mtrr);
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iounmap(map->handle);
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break;
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case _DRM_SHM:
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vfree(map->handle);
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break;
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case _DRM_AGP:
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case _DRM_SCATTER_GATHER:
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break;
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case _DRM_CONSISTENT:
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dma_free_coherent(dev->dev,
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map->size,
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map->handle,
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map->offset);
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break;
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}
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kfree(map);
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}
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}
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mutex_unlock(&dev->struct_mutex);
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}
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/*
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* \c fault method for DMA virtual memory.
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*
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* \param address access address.
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* \return pointer to the page structure.
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*
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* Determine the page number from the page offset and get it from drm_device_dma::pagelist.
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*/
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static vm_fault_t drm_vm_dma_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_file *priv = vma->vm_file->private_data;
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struct drm_device *dev = priv->minor->dev;
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struct drm_device_dma *dma = dev->dma;
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unsigned long offset;
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unsigned long page_nr;
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struct page *page;
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if (!dma)
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return VM_FAULT_SIGBUS; /* Error */
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if (!dma->pagelist)
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return VM_FAULT_SIGBUS; /* Nothing allocated */
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offset = vmf->address - vma->vm_start;
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/* vm_[pg]off[set] should be 0 */
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page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
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page = virt_to_page((void *)dma->pagelist[page_nr]);
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get_page(page);
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vmf->page = page;
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DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
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return 0;
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}
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/*
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* \c fault method for scatter-gather virtual memory.
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*
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* \param address access address.
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* \return pointer to the page structure.
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*
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* Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
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*/
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static vm_fault_t drm_vm_sg_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_local_map *map = vma->vm_private_data;
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struct drm_file *priv = vma->vm_file->private_data;
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struct drm_device *dev = priv->minor->dev;
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struct drm_sg_mem *entry = dev->sg;
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unsigned long offset;
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unsigned long map_offset;
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unsigned long page_offset;
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struct page *page;
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if (!entry)
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return VM_FAULT_SIGBUS; /* Error */
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if (!entry->pagelist)
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return VM_FAULT_SIGBUS; /* Nothing allocated */
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offset = vmf->address - vma->vm_start;
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map_offset = map->offset - (unsigned long)dev->sg->virtual;
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page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
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page = entry->pagelist[page_offset];
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get_page(page);
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vmf->page = page;
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return 0;
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}
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/** AGP virtual memory operations */
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static const struct vm_operations_struct drm_vm_ops = {
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.fault = drm_vm_fault,
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.open = drm_vm_open,
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.close = drm_vm_close,
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};
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/** Shared virtual memory operations */
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static const struct vm_operations_struct drm_vm_shm_ops = {
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.fault = drm_vm_shm_fault,
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.open = drm_vm_open,
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.close = drm_vm_shm_close,
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};
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/** DMA virtual memory operations */
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static const struct vm_operations_struct drm_vm_dma_ops = {
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.fault = drm_vm_dma_fault,
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.open = drm_vm_open,
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.close = drm_vm_close,
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};
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/** Scatter-gather virtual memory operations */
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static const struct vm_operations_struct drm_vm_sg_ops = {
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.fault = drm_vm_sg_fault,
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.open = drm_vm_open,
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.close = drm_vm_close,
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};
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static void drm_vm_open_locked(struct drm_device *dev,
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struct vm_area_struct *vma)
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{
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struct drm_vma_entry *vma_entry;
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DRM_DEBUG("0x%08lx,0x%08lx\n",
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vma->vm_start, vma->vm_end - vma->vm_start);
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vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
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if (vma_entry) {
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vma_entry->vma = vma;
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vma_entry->pid = current->pid;
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list_add(&vma_entry->head, &dev->vmalist);
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}
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}
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static void drm_vm_open(struct vm_area_struct *vma)
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{
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struct drm_file *priv = vma->vm_file->private_data;
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struct drm_device *dev = priv->minor->dev;
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mutex_lock(&dev->struct_mutex);
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drm_vm_open_locked(dev, vma);
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mutex_unlock(&dev->struct_mutex);
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}
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static void drm_vm_close_locked(struct drm_device *dev,
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struct vm_area_struct *vma)
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{
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struct drm_vma_entry *pt, *temp;
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DRM_DEBUG("0x%08lx,0x%08lx\n",
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vma->vm_start, vma->vm_end - vma->vm_start);
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list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
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if (pt->vma == vma) {
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list_del(&pt->head);
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kfree(pt);
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break;
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}
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}
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}
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/*
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* \c close method for all virtual memory types.
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*
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* \param vma virtual memory area.
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*
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* Search the \p vma private data entry in drm_device::vmalist, unlink it, and
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* free it.
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*/
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static void drm_vm_close(struct vm_area_struct *vma)
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{
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struct drm_file *priv = vma->vm_file->private_data;
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struct drm_device *dev = priv->minor->dev;
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mutex_lock(&dev->struct_mutex);
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drm_vm_close_locked(dev, vma);
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mutex_unlock(&dev->struct_mutex);
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}
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/*
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* mmap DMA memory.
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*
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* \param file_priv DRM file private.
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* \param vma virtual memory area.
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* \return zero on success or a negative number on failure.
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*
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* Sets the virtual memory area operations structure to vm_dma_ops, the file
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* pointer, and calls vm_open().
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*/
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static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
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{
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struct drm_file *priv = filp->private_data;
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struct drm_device *dev;
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struct drm_device_dma *dma;
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unsigned long length = vma->vm_end - vma->vm_start;
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dev = priv->minor->dev;
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dma = dev->dma;
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DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
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vma->vm_start, vma->vm_end, vma->vm_pgoff);
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/* Length must match exact page count */
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if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
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return -EINVAL;
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}
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if (!capable(CAP_SYS_ADMIN) &&
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(dma->flags & _DRM_DMA_USE_PCI_RO)) {
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vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
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#if defined(__i386__) || defined(__x86_64__)
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pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
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#else
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/* Ye gads this is ugly. With more thought
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we could move this up higher and use
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`protection_map' instead. */
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vma->vm_page_prot =
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__pgprot(pte_val
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(pte_wrprotect
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(__pte(pgprot_val(vma->vm_page_prot)))));
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#endif
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}
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vma->vm_ops = &drm_vm_dma_ops;
|
|
|
|
vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
|
|
|
|
drm_vm_open_locked(dev, vma);
|
|
return 0;
|
|
}
|
|
|
|
static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
|
|
{
|
|
#ifdef __alpha__
|
|
return dev->hose->dense_mem_base;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* mmap DMA memory.
|
|
*
|
|
* \param file_priv DRM file private.
|
|
* \param vma virtual memory area.
|
|
* \return zero on success or a negative number on failure.
|
|
*
|
|
* If the virtual memory area has no offset associated with it then it's a DMA
|
|
* area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
|
|
* checks that the restricted flag is not set, sets the virtual memory operations
|
|
* according to the mapping type and remaps the pages. Finally sets the file
|
|
* pointer and calls vm_open().
|
|
*/
|
|
static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
|
|
{
|
|
struct drm_file *priv = filp->private_data;
|
|
struct drm_device *dev = priv->minor->dev;
|
|
struct drm_local_map *map = NULL;
|
|
resource_size_t offset = 0;
|
|
struct drm_hash_item *hash;
|
|
|
|
DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
|
|
vma->vm_start, vma->vm_end, vma->vm_pgoff);
|
|
|
|
if (!priv->authenticated)
|
|
return -EACCES;
|
|
|
|
/* We check for "dma". On Apple's UniNorth, it's valid to have
|
|
* the AGP mapped at physical address 0
|
|
* --BenH.
|
|
*/
|
|
if (!vma->vm_pgoff
|
|
#if IS_ENABLED(CONFIG_AGP)
|
|
&& (!dev->agp
|
|
|| dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
|
|
#endif
|
|
)
|
|
return drm_mmap_dma(filp, vma);
|
|
|
|
if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
|
|
DRM_ERROR("Could not find map\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
|
|
if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
|
|
return -EPERM;
|
|
|
|
/* Check for valid size. */
|
|
if (map->size < vma->vm_end - vma->vm_start)
|
|
return -EINVAL;
|
|
|
|
if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
|
|
vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
|
|
#if defined(__i386__) || defined(__x86_64__)
|
|
pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
|
|
#else
|
|
/* Ye gads this is ugly. With more thought
|
|
we could move this up higher and use
|
|
`protection_map' instead. */
|
|
vma->vm_page_prot =
|
|
__pgprot(pte_val
|
|
(pte_wrprotect
|
|
(__pte(pgprot_val(vma->vm_page_prot)))));
|
|
#endif
|
|
}
|
|
|
|
switch (map->type) {
|
|
#if !defined(__arm__)
|
|
case _DRM_AGP:
|
|
if (dev->agp && dev->agp->cant_use_aperture) {
|
|
/*
|
|
* On some platforms we can't talk to bus dma address from the CPU, so for
|
|
* memory of type DRM_AGP, we'll deal with sorting out the real physical
|
|
* pages and mappings in fault()
|
|
*/
|
|
#if defined(__powerpc__)
|
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
|
|
#endif
|
|
vma->vm_ops = &drm_vm_ops;
|
|
break;
|
|
}
|
|
fallthrough; /* to _DRM_FRAME_BUFFER... */
|
|
#endif
|
|
case _DRM_FRAME_BUFFER:
|
|
case _DRM_REGISTERS:
|
|
offset = drm_core_get_reg_ofs(dev);
|
|
vma->vm_page_prot = drm_io_prot(map, vma);
|
|
if (io_remap_pfn_range(vma, vma->vm_start,
|
|
(map->offset + offset) >> PAGE_SHIFT,
|
|
vma->vm_end - vma->vm_start,
|
|
vma->vm_page_prot))
|
|
return -EAGAIN;
|
|
DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx,"
|
|
" offset = 0x%llx\n",
|
|
map->type,
|
|
vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
|
|
|
|
vma->vm_ops = &drm_vm_ops;
|
|
break;
|
|
case _DRM_CONSISTENT:
|
|
/* Consistent memory is really like shared memory. But
|
|
* it's allocated in a different way, so avoid fault */
|
|
if (remap_pfn_range(vma, vma->vm_start,
|
|
page_to_pfn(virt_to_page(map->handle)),
|
|
vma->vm_end - vma->vm_start, vma->vm_page_prot))
|
|
return -EAGAIN;
|
|
vma->vm_page_prot = drm_dma_prot(map->type, vma);
|
|
fallthrough; /* to _DRM_SHM */
|
|
case _DRM_SHM:
|
|
vma->vm_ops = &drm_vm_shm_ops;
|
|
vma->vm_private_data = (void *)map;
|
|
break;
|
|
case _DRM_SCATTER_GATHER:
|
|
vma->vm_ops = &drm_vm_sg_ops;
|
|
vma->vm_private_data = (void *)map;
|
|
vma->vm_page_prot = drm_dma_prot(map->type, vma);
|
|
break;
|
|
default:
|
|
return -EINVAL; /* This should never happen. */
|
|
}
|
|
vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
|
|
|
|
drm_vm_open_locked(dev, vma);
|
|
return 0;
|
|
}
|
|
|
|
int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma)
|
|
{
|
|
struct drm_file *priv = filp->private_data;
|
|
struct drm_device *dev = priv->minor->dev;
|
|
int ret;
|
|
|
|
if (drm_dev_is_unplugged(dev))
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&dev->struct_mutex);
|
|
ret = drm_mmap_locked(filp, vma);
|
|
mutex_unlock(&dev->struct_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_legacy_mmap);
|
|
|
|
#if IS_ENABLED(CONFIG_DRM_LEGACY)
|
|
void drm_legacy_vma_flush(struct drm_device *dev)
|
|
{
|
|
struct drm_vma_entry *vma, *vma_temp;
|
|
|
|
/* Clear vma list (only needed for legacy drivers) */
|
|
list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
|
|
list_del(&vma->head);
|
|
kfree(vma);
|
|
}
|
|
}
|
|
#endif
|