![Chris Wilson](/assets/img/avatar_default.png)
v2: Userspace (notably xf86-video-{intel,ati}) became confused when drmSetInterfaceVersion() started returning -EBUSY as they used a second call (the first done in drmOpen()) to check their master credentials. Since userspace wants to be able to repeatedly call drmSetInterfaceVersion() allow them to do so. v3: Rebase to drm-core-next. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Dave Airlie <airlied@redhat.com>
430 lines
10 KiB
C
430 lines
10 KiB
C
/**
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* \file drm_ioctl.c
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* IOCTL processing 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: Fri Jan 8 09:01:26 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 "drmP.h"
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#include "drm_core.h"
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#include "linux/pci.h"
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/**
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* Get the bus id.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_unique structure.
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* \return zero on success or a negative number on failure.
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*
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* Copies the bus id from drm_device::unique into user space.
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*/
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int drm_getunique(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_unique *u = data;
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struct drm_master *master = file_priv->master;
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if (u->unique_len >= master->unique_len) {
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if (copy_to_user(u->unique, master->unique, master->unique_len))
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return -EFAULT;
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}
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u->unique_len = master->unique_len;
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return 0;
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}
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static void
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drm_unset_busid(struct drm_device *dev,
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struct drm_master *master)
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{
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kfree(dev->devname);
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dev->devname = NULL;
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kfree(master->unique);
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master->unique = NULL;
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master->unique_len = 0;
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master->unique_size = 0;
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}
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/**
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* Set the bus id.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_unique structure.
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* \return zero on success or a negative number on failure.
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*
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* Copies the bus id from userspace into drm_device::unique, and verifies that
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* it matches the device this DRM is attached to (EINVAL otherwise). Deprecated
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* in interface version 1.1 and will return EBUSY when setversion has requested
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* version 1.1 or greater.
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*/
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int drm_setunique(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_unique *u = data;
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struct drm_master *master = file_priv->master;
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int domain, bus, slot, func, ret;
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if (master->unique_len || master->unique)
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return -EBUSY;
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if (!u->unique_len || u->unique_len > 1024)
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return -EINVAL;
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master->unique_len = u->unique_len;
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master->unique_size = u->unique_len + 1;
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master->unique = kmalloc(master->unique_size, GFP_KERNEL);
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if (!master->unique) {
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ret = -ENOMEM;
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goto err;
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}
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if (copy_from_user(master->unique, u->unique, master->unique_len)) {
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ret = -EFAULT;
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goto err;
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}
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master->unique[master->unique_len] = '\0';
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dev->devname = kmalloc(strlen(dev->driver->pci_driver.name) +
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strlen(master->unique) + 2, GFP_KERNEL);
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if (!dev->devname) {
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ret = -ENOMEM;
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goto err;
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}
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sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
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master->unique);
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/* Return error if the busid submitted doesn't match the device's actual
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* busid.
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*/
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ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
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if (ret != 3) {
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ret = -EINVAL;
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goto err;
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}
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domain = bus >> 8;
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bus &= 0xff;
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if ((domain != drm_get_pci_domain(dev)) ||
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(bus != dev->pdev->bus->number) ||
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(slot != PCI_SLOT(dev->pdev->devfn)) ||
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(func != PCI_FUNC(dev->pdev->devfn))) {
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ret = -EINVAL;
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goto err;
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}
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return 0;
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err:
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drm_unset_busid(dev, master);
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return ret;
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}
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static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
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{
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struct drm_master *master = file_priv->master;
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int len, ret;
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if (master->unique != NULL)
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drm_unset_busid(dev, master);
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if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE)) {
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master->unique_len = 10 + strlen(dev->platformdev->name);
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master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
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if (master->unique == NULL)
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return -ENOMEM;
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len = snprintf(master->unique, master->unique_len,
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"platform:%s", dev->platformdev->name);
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if (len > master->unique_len) {
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DRM_ERROR("Unique buffer overflowed\n");
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ret = -EINVAL;
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goto err;
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}
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dev->devname =
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kmalloc(strlen(dev->platformdev->name) +
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master->unique_len + 2, GFP_KERNEL);
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if (dev->devname == NULL) {
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ret = -ENOMEM;
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goto err;
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}
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sprintf(dev->devname, "%s@%s", dev->platformdev->name,
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master->unique);
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} else {
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master->unique_len = 40;
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master->unique_size = master->unique_len;
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master->unique = kmalloc(master->unique_size, GFP_KERNEL);
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if (master->unique == NULL)
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return -ENOMEM;
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len = snprintf(master->unique, master->unique_len,
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"pci:%04x:%02x:%02x.%d",
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drm_get_pci_domain(dev),
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dev->pdev->bus->number,
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PCI_SLOT(dev->pdev->devfn),
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PCI_FUNC(dev->pdev->devfn));
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if (len >= master->unique_len) {
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DRM_ERROR("buffer overflow");
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ret = -EINVAL;
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goto err;
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} else
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master->unique_len = len;
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dev->devname =
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kmalloc(strlen(dev->driver->pci_driver.name) +
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master->unique_len + 2, GFP_KERNEL);
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if (dev->devname == NULL) {
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ret = -ENOMEM;
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goto err;
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}
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sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
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master->unique);
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}
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return 0;
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err:
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drm_unset_busid(dev, master);
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return ret;
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}
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/**
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* Get a mapping information.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_map structure.
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*
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* \return zero on success or a negative number on failure.
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*
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* Searches for the mapping with the specified offset and copies its information
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* into userspace
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*/
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int drm_getmap(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_map *map = data;
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struct drm_map_list *r_list = NULL;
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struct list_head *list;
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int idx;
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int i;
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idx = map->offset;
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mutex_lock(&dev->struct_mutex);
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if (idx < 0) {
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mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
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}
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i = 0;
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list_for_each(list, &dev->maplist) {
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if (i == idx) {
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r_list = list_entry(list, struct drm_map_list, head);
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break;
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}
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i++;
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}
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if (!r_list || !r_list->map) {
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mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
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}
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map->offset = r_list->map->offset;
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map->size = r_list->map->size;
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map->type = r_list->map->type;
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map->flags = r_list->map->flags;
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map->handle = (void *)(unsigned long) r_list->user_token;
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map->mtrr = r_list->map->mtrr;
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mutex_unlock(&dev->struct_mutex);
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return 0;
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}
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/**
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* Get client information.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_client structure.
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*
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* \return zero on success or a negative number on failure.
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*
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* Searches for the client with the specified index and copies its information
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* into userspace
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*/
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int drm_getclient(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_client *client = data;
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struct drm_file *pt;
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int idx;
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int i;
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idx = client->idx;
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mutex_lock(&dev->struct_mutex);
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i = 0;
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list_for_each_entry(pt, &dev->filelist, lhead) {
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if (i++ >= idx) {
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client->auth = pt->authenticated;
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client->pid = pt->pid;
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client->uid = pt->uid;
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client->magic = pt->magic;
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client->iocs = pt->ioctl_count;
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mutex_unlock(&dev->struct_mutex);
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return 0;
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}
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}
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mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
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}
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/**
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* Get statistics information.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_stats structure.
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*
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* \return zero on success or a negative number on failure.
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*/
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int drm_getstats(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_stats *stats = data;
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int i;
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memset(stats, 0, sizeof(*stats));
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mutex_lock(&dev->struct_mutex);
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for (i = 0; i < dev->counters; i++) {
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if (dev->types[i] == _DRM_STAT_LOCK)
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stats->data[i].value =
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(file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0);
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else
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stats->data[i].value = atomic_read(&dev->counts[i]);
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stats->data[i].type = dev->types[i];
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}
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stats->count = dev->counters;
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mutex_unlock(&dev->struct_mutex);
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return 0;
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}
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/**
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* Setversion ioctl.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_lock structure.
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* \return zero on success or negative number on failure.
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*
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* Sets the requested interface version
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*/
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int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
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{
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struct drm_set_version *sv = data;
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int if_version, retcode = 0;
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if (sv->drm_di_major != -1) {
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if (sv->drm_di_major != DRM_IF_MAJOR ||
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sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
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retcode = -EINVAL;
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goto done;
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}
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if_version = DRM_IF_VERSION(sv->drm_di_major,
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sv->drm_di_minor);
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dev->if_version = max(if_version, dev->if_version);
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if (sv->drm_di_minor >= 1) {
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/*
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* Version 1.1 includes tying of DRM to specific device
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*/
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retcode = drm_set_busid(dev, file_priv);
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if (retcode)
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goto done;
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}
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}
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if (sv->drm_dd_major != -1) {
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if (sv->drm_dd_major != dev->driver->major ||
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sv->drm_dd_minor < 0 || sv->drm_dd_minor >
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dev->driver->minor) {
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retcode = -EINVAL;
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goto done;
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}
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if (dev->driver->set_version)
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dev->driver->set_version(dev, sv);
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}
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done:
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sv->drm_di_major = DRM_IF_MAJOR;
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sv->drm_di_minor = DRM_IF_MINOR;
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sv->drm_dd_major = dev->driver->major;
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sv->drm_dd_minor = dev->driver->minor;
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return retcode;
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}
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/** No-op ioctl. */
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int drm_noop(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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DRM_DEBUG("\n");
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return 0;
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}
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