drivers/gpu/drm/drm_pci.c - third_party/linux - Git at Google

 /* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */
 /**
  * \file drm_pci.c
  * \brief Functions and ioctls to manage PCI memory
  *
  * \warning These interfaces aren't stable yet.
  *
  * \todo Implement the remaining ioctl's for the PCI pools.
  * \todo The wrappers here are so thin that they would be better off inlined..
  *
  * \author José Fonseca <jrfonseca@tungstengraphics.com>
  * \author Leif Delgass <ldelgass@retinalburn.net>
  */

 /*
  * Copyright 2003 José Fonseca.
  * Copyright 2003 Leif Delgass.
  * All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice (including the next
  * paragraph) shall be included in all copies or substantial portions of the
  * Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */

 #include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/dma-mapping.h>
 #include "drmP.h"

 /**********************************************************************/
 /** \name PCI memory */
 /*@{*/

 /**
  * \brief Allocate a PCI consistent memory block, for DMA.
  */
 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
 {
 	drm_dma_handle_t *dmah;
 #if 1
 	unsigned long addr;
 	size_t sz;
 #endif

 	/* pci_alloc_consistent only guarantees alignment to the smallest
 	 * PAGE_SIZE order which is greater than or equal to the requested size.
 	 * Return NULL here for now to make sure nobody tries for larger alignment
 	 */
 	if (align > size)
 		return NULL;

 	dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
 	if (!dmah)
 		return NULL;

 	dmah->size = size;
 	dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);

 	if (dmah->vaddr == NULL) {
 		kfree(dmah);
 		return NULL;
 	}

 	memset(dmah->vaddr, 0, size);

 	/* XXX - Is virt_to_page() legal for consistent mem? */
 	/* Reserve */
 	for (addr = (unsigned long)dmah->vaddr, sz = size;
 	     sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
 		SetPageReserved(virt_to_page(addr));
 	}

 	return dmah;
 }

 EXPORT_SYMBOL(drm_pci_alloc);

 /**
  * \brief Free a PCI consistent memory block without freeing its descriptor.
  *
  * This function is for internal use in the Linux-specific DRM core code.
  */
 void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
 {
 #if 1
 	unsigned long addr;
 	size_t sz;
 #endif

 	if (dmah->vaddr) {
 		/* XXX - Is virt_to_page() legal for consistent mem? */
 		/* Unreserve */
 		for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
 		     sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
 			ClearPageReserved(virt_to_page(addr));
 		}
 		dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
 				  dmah->busaddr);
 	}
 }

 /**
  * \brief Free a PCI consistent memory block
  */
 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
 {
 	__drm_pci_free(dev, dmah);
 	kfree(dmah);
 }

 EXPORT_SYMBOL(drm_pci_free);

 #ifdef CONFIG_PCI
 /**
  * Register.
  *
  * \param pdev - PCI device structure
  * \param ent entry from the PCI ID table with device type flags
  * \return zero on success or a negative number on failure.
  *
  * Attempt to gets inter module "drm" information. If we are first
  * then register the character device and inter module information.
  * Try and register, if we fail to register, backout previous work.
  */
 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 		    struct drm_driver *driver)
 {
 	struct drm_device *dev;
 	int ret;

 	DRM_DEBUG("\n");

 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 	if (!dev)
 		return -ENOMEM;

 	ret = pci_enable_device(pdev);
 	if (ret)
 		goto err_g1;

 	pci_set_master(pdev);

 	dev->pdev = pdev;
 	dev->dev = &pdev->dev;

 	dev->pci_device = pdev->device;
 	dev->pci_vendor = pdev->vendor;

 #ifdef __alpha__
 	dev->hose = pdev->sysdata;
 #endif

 	if ((ret = drm_fill_in_dev(dev, ent, driver))) {
 		printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
 		goto err_g2;
 	}

 	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 		pci_set_drvdata(pdev, dev);
 		ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
 		if (ret)
 			goto err_g2;
 	}

 	if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
 		goto err_g3;

 	if (dev->driver->load) {
 		ret = dev->driver->load(dev, ent->driver_data);
 		if (ret)
 			goto err_g4;
 	}

 	/* setup the grouping for the legacy output */
 	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 		ret = drm_mode_group_init_legacy_group(dev,
 						&dev->primary->mode_group);
 		if (ret)
 			goto err_g4;
 	}

 	list_add_tail(&dev->driver_item, &driver->device_list);

 	DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
 		 driver->name, driver->major, driver->minor, driver->patchlevel,
 		 driver->date, pci_name(pdev), dev->primary->index);

 	return 0;

 err_g4:
 	drm_put_minor(&dev->primary);
 err_g3:
 	if (drm_core_check_feature(dev, DRIVER_MODESET))
 		drm_put_minor(&dev->control);
 err_g2:
 	pci_disable_device(pdev);
 err_g1:
 	kfree(dev);
 	return ret;
 }
 EXPORT_SYMBOL(drm_get_pci_dev);

 /**
  * PCI device initialization. Called via drm_init at module load time,
  *
  * \return zero on success or a negative number on failure.
  *
  * Initializes a drm_device structures,registering the
  * stubs and initializing the AGP device.
  *
  * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
  * after the initialization for driver customization.
  */
 int drm_pci_init(struct drm_driver *driver)
 {
 	struct pci_dev *pdev = NULL;
 	const struct pci_device_id *pid;
 	int i;

 	if (driver->driver_features & DRIVER_MODESET)
 		return pci_register_driver(&driver->pci_driver);

 	/* If not using KMS, fall back to stealth mode manual scanning. */
 	for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
 		pid = &driver->pci_driver.id_table[i];

 		/* Loop around setting up a DRM device for each PCI device
 		 * matching our ID and device class.  If we had the internal
 		 * function that pci_get_subsys and pci_get_class used, we'd
 		 * be able to just pass pid in instead of doing a two-stage
 		 * thing.
 		 */
 		pdev = NULL;
 		while ((pdev =
 			pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
 				       pid->subdevice, pdev)) != NULL) {
 			if ((pdev->class & pid->class_mask) != pid->class)
 				continue;

 			/* stealth mode requires a manual probe */
 			pci_dev_get(pdev);
 			drm_get_pci_dev(pdev, pid, driver);
 		}
 	}
 	return 0;
 }

 #else

 int drm_pci_init(struct drm_driver *driver)
 {
 	return -1;
 }

 #endif
 /*@}*/
	/* drm_pci.h -- PCI DMA memory management wrappers for DRM -- linux-c -- */
	/**
	* \file drm_pci.c
	* \brief Functions and ioctls to manage PCI memory
	*
	* \warning These interfaces aren't stable yet.
	*
	* \todo Implement the remaining ioctl's for the PCI pools.
	* \todo The wrappers here are so thin that they would be better off inlined..
	*
	* \author José Fonseca <jrfonseca@tungstengraphics.com>
	* \author Leif Delgass <ldelgass@retinalburn.net>
	*/

	/*
	* Copyright 2003 José Fonseca.
	* Copyright 2003 Leif Delgass.
	* All Rights Reserved.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice (including the next
	* paragraph) shall be included in all copies or substantial portions of the
	* Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
	* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	*/

	#include <linux/pci.h>
	#include <linux/slab.h>
	#include <linux/dma-mapping.h>
	#include "drmP.h"

	/**********************************************************************/
	/** \name PCI memory */
	/@{/

	/**
	* \brief Allocate a PCI consistent memory block, for DMA.
	*/
	drm_dma_handle_t drm_pci_alloc(struct drm_device dev, size_t size, size_t align)
	{
	drm_dma_handle_t *dmah;
	#if 1
	unsigned long addr;
	size_t sz;
	#endif

	/* pci_alloc_consistent only guarantees alignment to the smallest
	* PAGE_SIZE order which is greater than or equal to the requested size.
	* Return NULL here for now to make sure nobody tries for larger alignment
	*/
	if (align > size)
	return NULL;

	dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
	if (!dmah)
	return NULL;

	dmah->size = size;
	dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL \| __GFP_COMP);

	if (dmah->vaddr == NULL) {
	kfree(dmah);
	return NULL;
	}

	memset(dmah->vaddr, 0, size);

	/* XXX - Is virt_to_page() legal for consistent mem? */
	/* Reserve */
	for (addr = (unsigned long)dmah->vaddr, sz = size;
	sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
	SetPageReserved(virt_to_page(addr));
	}

	return dmah;
	}

	EXPORT_SYMBOL(drm_pci_alloc);

	/**
	* \brief Free a PCI consistent memory block without freeing its descriptor.
	*
	* This function is for internal use in the Linux-specific DRM core code.
	*/
	void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
	{
	#if 1
	unsigned long addr;
	size_t sz;
	#endif

	if (dmah->vaddr) {
	/* XXX - Is virt_to_page() legal for consistent mem? */
	/* Unreserve */
	for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
	sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
	ClearPageReserved(virt_to_page(addr));
	}
	dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
	dmah->busaddr);
	}
	}

	/**
	* \brief Free a PCI consistent memory block
	*/
	void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
	{
	__drm_pci_free(dev, dmah);
	kfree(dmah);
	}

	EXPORT_SYMBOL(drm_pci_free);

	#ifdef CONFIG_PCI
	/**
	* Register.
	*
	* \param pdev - PCI device structure
	* \param ent entry from the PCI ID table with device type flags
	* \return zero on success or a negative number on failure.
	*
	* Attempt to gets inter module "drm" information. If we are first
	* then register the character device and inter module information.
	* Try and register, if we fail to register, backout previous work.
	*/
	int drm_get_pci_dev(struct pci_dev pdev, const struct pci_device_id ent,
	struct drm_driver *driver)
	{
	struct drm_device *dev;
	int ret;

	DRM_DEBUG("\n");

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
	return -ENOMEM;

	ret = pci_enable_device(pdev);
	if (ret)
	goto err_g1;

	pci_set_master(pdev);

	dev->pdev = pdev;
	dev->dev = &pdev->dev;

	dev->pci_device = pdev->device;
	dev->pci_vendor = pdev->vendor;

	#ifdef __alpha__
	dev->hose = pdev->sysdata;
	#endif

	if ((ret = drm_fill_in_dev(dev, ent, driver))) {
	printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
	goto err_g2;
	}

	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
	pci_set_drvdata(pdev, dev);
	ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
	if (ret)
	goto err_g2;
	}

	if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
	goto err_g3;

	if (dev->driver->load) {
	ret = dev->driver->load(dev, ent->driver_data);
	if (ret)
	goto err_g4;
	}

	/* setup the grouping for the legacy output */
	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
	ret = drm_mode_group_init_legacy_group(dev,
	&dev->primary->mode_group);
	if (ret)
	goto err_g4;
	}

	list_add_tail(&dev->driver_item, &driver->device_list);

	DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
	driver->name, driver->major, driver->minor, driver->patchlevel,
	driver->date, pci_name(pdev), dev->primary->index);

	return 0;

	err_g4:
	drm_put_minor(&dev->primary);
	err_g3:
	if (drm_core_check_feature(dev, DRIVER_MODESET))
	drm_put_minor(&dev->control);
	err_g2:
	pci_disable_device(pdev);
	err_g1:
	kfree(dev);
	return ret;
	}
	EXPORT_SYMBOL(drm_get_pci_dev);

	/**
	* PCI device initialization. Called via drm_init at module load time,
	*
	* \return zero on success or a negative number on failure.
	*
	* Initializes a drm_device structures,registering the
	* stubs and initializing the AGP device.
	*
	* Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
	* after the initialization for driver customization.
	*/
	int drm_pci_init(struct drm_driver *driver)
	{
	struct pci_dev *pdev = NULL;
	const struct pci_device_id *pid;
	int i;

	if (driver->driver_features & DRIVER_MODESET)
	return pci_register_driver(&driver->pci_driver);

	/* If not using KMS, fall back to stealth mode manual scanning. */
	for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
	pid = &driver->pci_driver.id_table[i];

	/* Loop around setting up a DRM device for each PCI device
	* matching our ID and device class. If we had the internal
	* function that pci_get_subsys and pci_get_class used, we'd
	* be able to just pass pid in instead of doing a two-stage
	* thing.
	*/
	pdev = NULL;
	while ((pdev =
	pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
	pid->subdevice, pdev)) != NULL) {
	if ((pdev->class & pid->class_mask) != pid->class)
	continue;

	/* stealth mode requires a manual probe */
	pci_dev_get(pdev);
	drm_get_pci_dev(pdev, pid, driver);
	}
	}
	return 0;
	}

	#else

	int drm_pci_init(struct drm_driver *driver)
	{
	return -1;
	}

	#endif
	/@}/