359 lines
10 KiB
C
359 lines
10 KiB
C
/**
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* \file drm_stub.h
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* Stub support
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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*/
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/*
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* Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
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*
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* Copyright 2001 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 "drmP.h"
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static unsigned int cards_limit = 16; /* Enough for one machine */
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static unsigned int debug = 0; /* 1 to enable debug output */
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MODULE_AUTHOR( DRIVER_AUTHOR );
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MODULE_DESCRIPTION( DRIVER_DESC );
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MODULE_LICENSE("GPL and additional rights");
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MODULE_PARM_DESC(cards_limit, "Maximum number of graphics cards");
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MODULE_PARM_DESC(debug, "Enable debug output");
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module_param(cards_limit, int, 0444);
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module_param(debug, int, 0666);
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drm_global_t *DRM(global);
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/**
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* File \c open operation.
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*
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* \param inode device inode.
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* \param filp file pointer.
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*
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* Puts the dev->fops corresponding to the device minor number into
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* \p filp, call the \c open method, and restore the file operations.
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*/
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static int stub_open(struct inode *inode, struct file *filp)
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{
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drm_device_t *dev = NULL;
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int minor = iminor(inode);
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int err = -ENODEV;
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struct file_operations *old_fops;
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DRM_DEBUG("\n");
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if (!((minor >= 0) && (minor < DRM(global)->cards_limit)))
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return -ENODEV;
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dev = DRM(global)->minors[minor].dev;
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if (!dev)
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return -ENODEV;
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old_fops = filp->f_op;
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filp->f_op = fops_get(dev->fops);
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if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
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fops_put(filp->f_op);
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filp->f_op = fops_get(old_fops);
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}
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fops_put(old_fops);
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return err;
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}
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/** File operations structure */
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static struct file_operations DRM(stub_fops) = {
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.owner = THIS_MODULE,
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.open = stub_open
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};
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/**
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* Get a device minor number.
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*
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* \param pdev PCI device structure
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* \param ent entry from the PCI ID table with device type flags
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* \return negative number on failure.
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*
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* Search an empty entry and initialize it to the given parameters, and
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* create the proc init entry via proc_init().
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*/
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static int get_minor(struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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struct class_device *dev_class;
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drm_device_t *dev;
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int ret;
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int minor;
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drm_minor_t *minors = &DRM(global)->minors[0];
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DRM_DEBUG("\n");
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for (minor = 0; minor < DRM(global)->cards_limit; minor++, minors++) {
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if (minors->class == DRM_MINOR_FREE) {
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DRM_DEBUG("assigning minor %d\n", minor);
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dev = DRM(calloc)(1, sizeof(*dev), DRM_MEM_STUB);
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if(!dev)
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return -ENOMEM;
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*minors = (drm_minor_t){.dev = dev, .class = DRM_MINOR_PRIMARY};
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dev->minor = minor;
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if ((ret = DRM(fill_in_dev)(dev, pdev, ent))) {
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printk (KERN_ERR "DRM: Fill_in_dev failed.\n");
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goto err_g1;
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}
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if ((ret = DRM(proc_init)(dev, minor, DRM(global)->proc_root, &minors->dev_root))) {
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printk (KERN_ERR "DRM: Failed to initialize /proc/dri.\n");
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goto err_g1;
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}
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if (!DRM(fb_loaded)) {
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pci_set_drvdata(pdev, dev);
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pci_request_regions(pdev, DRIVER_NAME);
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pci_enable_device(pdev);
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}
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dev_class = DRM(sysfs_device_add)(DRM(global)->drm_class,
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MKDEV(DRM_MAJOR, minor), DRM_PCI_DEV(pdev), "card%d", minor);
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if (IS_ERR(dev_class)) {
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printk (KERN_ERR "DRM: Error sysfs_device_add.\n");
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ret = PTR_ERR(dev_class);
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goto err_g2;
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}
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DRM_DEBUG("new primary minor assigned %d\n", minor);
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return 0;
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}
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}
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DRM_ERROR("out of minors\n");
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return -ENOMEM;
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err_g2:
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if (!DRM(fb_loaded)) {
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pci_set_drvdata(pdev, NULL);
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pci_release_regions(pdev);
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pci_disable_device(pdev);
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}
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DRM(proc_cleanup)(minor, DRM(global)->proc_root, minors->dev_root);
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err_g1:
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*minors = (drm_minor_t){.dev = NULL, .class = DRM_MINOR_FREE};
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DRM(free)(dev, sizeof(*dev), DRM_MEM_STUB);
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return ret;
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}
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/**
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* Get a secondary minor number.
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*
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* \param dev device data structure
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* \param sec-minor structure to hold the assigned minor
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* \return negative number on failure.
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*
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* Search an empty entry and initialize it to the given parameters, and
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* create the proc init entry via proc_init(). This routines assigns
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* minor numbers to secondary heads of multi-headed cards
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*/
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int DRM(get_secondary_minor)(drm_device_t *dev, drm_minor_t **sec_minor)
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{
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drm_minor_t *minors = &DRM(global)->minors[0];
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struct class_device *dev_class;
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int ret;
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int minor;
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DRM_DEBUG("\n");
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for (minor = 0; minor < DRM(global)->cards_limit; minor++, minors++) {
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if (minors->class == DRM_MINOR_FREE) {
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*minors = (drm_minor_t){.dev = dev, .class = DRM_MINOR_SECONDARY};
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if ((ret = DRM(proc_init)(dev, minor, DRM(global)->proc_root, &minors->dev_root))) {
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printk (KERN_ERR "DRM: Failed to initialize /proc/dri.\n");
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goto err_g1;
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}
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dev_class = DRM(sysfs_device_add)(DRM(global)->drm_class,
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MKDEV(DRM_MAJOR, minor), DRM_PCI_DEV(dev->pdev), "card%d", minor);
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if (IS_ERR(dev_class)) {
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printk (KERN_ERR "DRM: Error sysfs_device_add.\n");
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ret = PTR_ERR(dev_class);
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goto err_g2;
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}
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*sec_minor = minors;
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DRM_DEBUG("new secondary minor assigned %d\n", minor);
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return 0;
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}
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}
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DRM_ERROR("out of minors\n");
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return -ENOMEM;
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err_g2:
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DRM(proc_cleanup)(minor, DRM(global)->proc_root, minors->dev_root);
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err_g1:
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*minors = (drm_minor_t){.dev = NULL, .class = DRM_MINOR_FREE};
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DRM(free)(dev, sizeof(*dev), DRM_MEM_STUB);
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return ret;
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}
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/**
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* Put a device minor number.
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*
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* \param dev device data structure
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* \return always zero
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*
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* Cleans up the proc resources. If it is the last minor then release the foreign
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* "drm" data, otherwise unregisters the "drm" data, frees the dev list and
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* unregisters the character device.
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*/
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int DRM(put_minor)(drm_device_t *dev)
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{
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drm_minor_t *minors = &DRM(global)->minors[dev->minor];
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int i;
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DRM_DEBUG("release primary minor %d\n", dev->minor);
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DRM(proc_cleanup)(dev->minor, DRM(global)->proc_root, minors->dev_root);
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DRM(sysfs_device_remove)(MKDEV(DRM_MAJOR, dev->minor));
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*minors = (drm_minor_t){.dev = NULL, .class = DRM_MINOR_FREE};
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DRM(free)(dev, sizeof(*dev), DRM_MEM_STUB);
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/* if any device pointers are non-NULL we are not the last module */
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for (i = 0; i < DRM(global)->cards_limit; i++) {
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if (DRM(global)->minors[i].class != DRM_MINOR_FREE) {
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DRM_DEBUG("inter_module_put called\n");
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inter_module_put("drm");
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return 0;
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}
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}
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DRM_DEBUG("unregistering inter_module \n");
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inter_module_unregister("drm");
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remove_proc_entry("dri", NULL);
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DRM(sysfs_destroy)(DRM(global)->drm_class);
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unregister_chrdev(DRM_MAJOR, "drm");
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DRM(free)(DRM(global)->minors, sizeof(*DRM(global)->minors) *
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DRM(global)->cards_limit, DRM_MEM_STUB);
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DRM(free)(DRM(global), sizeof(*DRM(global)), DRM_MEM_STUB);
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DRM(global) = NULL;
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return 0;
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}
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/**
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* Put a secondary minor number.
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*
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* \param sec_minor - structure to be released
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* \return always zero
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*
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* Cleans up the proc resources. Not legal for this to be the
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* last minor released.
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*
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*/
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int DRM(put_secondary_minor)(drm_minor_t *sec_minor)
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{
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int minor = sec_minor - &DRM(global)->minors[0];
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DRM_DEBUG("release secondary minor %d\n", minor);
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DRM(proc_cleanup)(minor, DRM(global)->proc_root, sec_minor->dev_root);
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DRM(sysfs_device_remove)(MKDEV(DRM_MAJOR, minor));
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*sec_minor = (drm_minor_t){.dev = NULL, .class = DRM_MINOR_FREE};
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return 0;
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}
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/**
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* Register.
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*
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* \param pdev - PCI device structure
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* \param ent entry from the PCI ID table with device type flags
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* \return zero on success or a negative number on failure.
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*
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* Attempt to gets inter module "drm" information. If we are first
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* then register the character device and inter module information.
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* Try and register, if we fail to register, backout previous work.
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*/
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int DRM(probe)(struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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drm_global_t *global;
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int ret = -ENOMEM;
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DRM_DEBUG("\n");
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/* use the inter_module_get to check - as if the same module
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registers chrdev twice it succeeds */
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global = (drm_global_t *)inter_module_get("drm");
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if (global) {
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DRM(global) = global;
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global = NULL;
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} else {
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DRM_DEBUG("first probe\n");
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global = DRM(calloc)(1, sizeof(*global), DRM_MEM_STUB);
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if(!global)
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return -ENOMEM;
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global->cards_limit = (cards_limit < DRM_MAX_MINOR + 1 ? cards_limit : DRM_MAX_MINOR + 1);
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global->minors = DRM(calloc)(global->cards_limit,
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sizeof(*global->minors), DRM_MEM_STUB);
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if(!global->minors)
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goto err_p1;
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if (register_chrdev(DRM_MAJOR, "drm", &DRM(stub_fops)))
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goto err_p1;
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global->drm_class = DRM(sysfs_create)(THIS_MODULE, "drm");
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if (IS_ERR(global->drm_class)) {
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printk (KERN_ERR "DRM: Error creating drm class.\n");
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ret = PTR_ERR(global->drm_class);
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goto err_p2;
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}
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global->proc_root = create_proc_entry("dri", S_IFDIR, NULL);
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if (!global->proc_root) {
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DRM_ERROR("Cannot create /proc/dri\n");
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ret = -1;
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goto err_p3;
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}
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DRM_DEBUG("calling inter_module_register\n");
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inter_module_register("drm", THIS_MODULE, global);
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DRM(global) = global;
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}
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if ((ret = get_minor(pdev, ent))) {
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if (global)
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goto err_p3;
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return ret;
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}
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return 0;
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err_p3:
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DRM(sysfs_destroy)(global->drm_class);
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err_p2:
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unregister_chrdev(DRM_MAJOR, "drm");
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DRM(free)(global->minors, sizeof(*global->minors) * global->cards_limit, DRM_MEM_STUB);
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err_p1:
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DRM(free)(global, sizeof(*global), DRM_MEM_STUB);
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DRM(global) = NULL;
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return ret;
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}
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