Commit a8a2be94 authored by rajesh.shah@intel.com's avatar rajesh.shah@intel.com Committed by Greg Kroah-Hartman
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[PATCH] pciehp: reduce dependence on ACPI 



Reduce the PCI Express hotplug driver's dependence on ACPI.
We don't walk the acpi namespace anymore to build a list of
bridges and devices. We go to ACPI only to run the _OSC or
_OSHP methods to transition control of hotplug hardware from
system BIOS to the hotplug driver, and to run the _HPP
method to get hotplug device parameters like cache line size,
latency timer and SERR/PERR enable from BIOS.

Note that one of the side effects of this patch is that pciehp
does not automatically enable the hot-added device or its DMA
bus mastering capability now. It expects the device driver to
do that. This may break some drivers and we will have to fix
them as they are reported.

Signed-off-by: default avatarRajesh Shah <rajesh.shah@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 71b720c0

drivers/pci/hotplug/pciehp.h

+11 −0
Original line number Diff line number Diff line
@@ -49,6 +49,13 @@ extern int pciehp_debug; 
#define info(format, arg...) printk(KERN_INFO "%s: " format, MY_NAME , ## arg)

#define warn(format, arg...) printk(KERN_WARNING "%s: " format, MY_NAME , ## arg)



struct hotplug_params {

	u8 cache_line_size;

	u8 latency_timer;

	u8 enable_serr;

	u8 enable_perr;

};



struct pci_func {

	struct pci_func *next;

	u8 bus;
@@ -199,6 +206,10 @@ extern int pciehp_save_config (struct controller *ctrl, int busnumber, int num 
extern int	pciehp_save_slot_config		(struct controller *ctrl, struct pci_func * new_slot);

extern int	pciehp_configure_device		(struct slot *ctrl);

extern int	pciehp_unconfigure_device	(struct pci_func* func);

extern int	get_hp_hw_control_from_firmware(struct pci_dev *dev);

extern void	get_hp_params_from_firmware(struct pci_dev *dev,

	       	struct hotplug_params *hpp);







/* Global variables */

drivers/pci/hotplug/pciehp_core.c

+6 −14
Original line number Diff line number Diff line
@@ -39,7 +39,6 @@ 
#include <linux/init.h>

#include <asm/uaccess.h>

#include "pciehp.h"

#include "pciehprm.h"

#include <linux/interrupt.h>



/* Global variables */
@@ -381,6 +380,7 @@ static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_ 
	dbg("%s: DRV_thread pid = %d\n", __FUNCTION__, current->pid);

	

	pdev = dev->port;

	ctrl->pci_dev = pdev;



	rc = pcie_init(ctrl, dev,

		(php_intr_callback_t) pciehp_handle_attention_button,
@@ -392,8 +392,6 @@ static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_ 
		goto err_out_free_ctrl;

	}



	ctrl->pci_dev = pdev;



	pci_set_drvdata(pdev, ctrl);



	ctrl->pci_bus = kmalloc(sizeof(*ctrl->pci_bus), GFP_KERNEL);
@@ -609,18 +607,14 @@ static int __init pcied_init(void) 
	if (retval)

		goto error_hpc_init;



	retval = pciehprm_init(PCI);

	if (!retval) {

	retval = pcie_port_service_register(&hpdriver_portdrv);

 	dbg("pcie_port_service_register = %d\n", retval);

  	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");

 	if (retval)

		dbg("%s: Failure to register service\n", __FUNCTION__);

	}



error_hpc_init:

	if (retval) {

		pciehprm_cleanup();

		pciehp_event_stop_thread();

	};
@@ -632,8 +626,6 @@ static void __exit pcied_cleanup(void) 
	dbg("unload_pciehpd()\n");

	unload_pciehpd();



	pciehprm_cleanup();



	dbg("pcie_port_service_unregister\n");

	pcie_port_service_unregister(&hpdriver_portdrv);

drivers/pci/hotplug/pciehp_ctrl.c

+0 −1
Original line number Diff line number Diff line
@@ -40,7 +40,6 @@ 
#include <linux/pci.h>

#include "../pci.h"

#include "pciehp.h"

#include "pciehprm.h"



static void interrupt_event_handler(struct controller *ctrl);

drivers/pci/hotplug/pciehp_hpc.c

+4 −0
Original line number Diff line number Diff line
@@ -1470,6 +1470,10 @@ int pcie_init(struct controller * ctrl, 
	}

	dbg("%s: SLOT_STATUS offset %x writes slot_status %x\n", __FUNCTION__, SLOT_STATUS(ctrl->cap_base), temp_word);

	

	rc = get_hp_hw_control_from_firmware(ctrl->pci_dev);

	if (rc)

		goto abort_free_ctlr;



	/*  Add this HPC instance into the HPC list */

	spin_lock(&list_lock);

	if (php_ctlr_list_head == 0) {

drivers/pci/hotplug/pciehprm.h

deleted100644 → 0
+0 −52
Original line number Diff line number Diff line 
/*

 * PCIEHPRM : PCIEHP Resource Manager for ACPI/non-ACPI platform

 *

 * Copyright (C) 1995,2001 Compaq Computer Corporation

 * Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)

 * Copyright (C) 2001 IBM Corp.

 * Copyright (C) 2003-2004 Intel Corporation

 *

 * All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or (at

 * your option) any later version.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or

 * NON INFRINGEMENT.  See the GNU General Public License for more

 * details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 *

 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>

 *

 */



#ifndef _PCIEHPRM_H_

#define _PCIEHPRM_H_



#ifdef	CONFIG_HOTPLUG_PCI_PCIE_PHPRM_NONACPI

#include "pciehprm_nonacpi.h"

#endif



int pciehprm_init(enum php_ctlr_type ct);

void pciehprm_cleanup(void);

int pciehprm_print_pirt(void);

int pciehprm_find_available_resources(struct controller *ctrl);

int pciehprm_set_hpp(struct controller *ctrl, struct pci_func *func, u8 card_type);

void pciehprm_enable_card(struct controller *ctrl, struct pci_func *func, u8 card_type);



#ifdef	DEBUG

#define RES_CHECK(this, bits)	\

	{ if (((this) & (bits - 1))) \

		printk("%s:%d ERR: potential res loss!\n", __FUNCTION__, __LINE__); }

#else

#define RES_CHECK(this, bits)

#endif



#endif				/* _PCIEHPRM_H_ */

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