lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <4AE52B68.3070501@jp.fujitsu.com>
Date:	Mon, 26 Oct 2009 13:54:00 +0900
From:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Alex Chiang <achiang@...com>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Bjorn Helgaas <bjorn.helgaas@...com>
Subject: Re: [PATCH] pci: pciehp update the slot bridge res to get big range
 for pcie devices

Yinghai Lu wrote:
> move out bus_size_bridges and assign resources out of pciehp_add_bridge()
> and at last do them all together one time including slot bridge, to avoid to call
> assign resources several times, when there are several bridges under the slot bridge.
> 
> need to introduce pci_bridge_assign_resources there.
> 
> handle the case the first bridge that doesn't get pre-allocated big enough res from FW.
> for example pcie devices need 256M, but the bridge only get preallocated 2M...
> 

Though I have not looked at the patch deeply yet (sorry), I have
some questions and concerns about this change. Please correct me
if my understanding is not correct.

- Your patch doesn't seems to have the code to free resources.
  If we need to expand the resource range, don't we need to free
  preallocated resource before allocating the new one?

- Your patch seems to update BARs for bridge itself. I think it
  would break the bridge's driver (port service driver) that if
  it controls the device's capability by using IO/Mem, though I
  don't know if such driver or capabilities exists now.

And one comment about pci_configure_slot(). We need to program
hotplug parameters before the device start working. So we need
to call pci_configure_slot() before calling pci_bus_add_devices().

Thanks,
Kenji Kaneshige


> pci_is_enabled must be removed in pci_setup_bridge(), otherwise update res is not
> updated to bridge BAR. and we are safe to do that, because only have one bus_size
> and assigned resources are called.
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> 
> ---
>  drivers/pci/hotplug/pciehp_pci.c |   29 ++++++++++++----
>  drivers/pci/setup-bus.c          |   70 +++++++++++++++++++++++++++++++++++++--
>  include/linux/pci.h              |    1 
>  3 files changed, 90 insertions(+), 10 deletions(-)
> 
> Index: linux-2.6/drivers/pci/hotplug/pciehp_pci.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/hotplug/pciehp_pci.c
> +++ linux-2.6/drivers/pci/hotplug/pciehp_pci.c
> @@ -53,19 +53,18 @@ static int __ref pciehp_add_bridge(struc
>  		busnr = pci_scan_bridge(parent, dev, busnr, pass);
>  	if (!dev->subordinate)
>  		return -1;
> -	pci_bus_size_bridges(dev->subordinate);
> -	pci_bus_assign_resources(parent);
> -	pci_enable_bridges(parent);
> -	pci_bus_add_devices(parent);
> +
>  	return 0;
>  }
>  
>  int pciehp_configure_device(struct slot *p_slot)
>  {
>  	struct pci_dev *dev;
> -	struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
> +	struct pci_dev *bridge = p_slot->ctrl->pcie->port;
> +	struct pci_bus *parent = bridge->subordinate;
>  	int num, fn;
>  	struct controller *ctrl = p_slot->ctrl;
> +	int retval;
>  
>  	dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
>  	if (dev) {
> @@ -96,12 +95,28 @@ int pciehp_configure_device(struct slot
>  				(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
>  			pciehp_add_bridge(dev);
>  		}
> -		pci_configure_slot(dev);
>  		pci_dev_put(dev);
>  	}
>  
> -	pci_bus_assign_resources(parent);
> +	pci_bus_size_bridges(parent);
> +	pci_bridge_assign_resources(bridge);
> +	retval = pci_reenable_device(bridge);
> +	pci_set_master(bridge);
> +	pci_enable_bridges(parent);
>  	pci_bus_add_devices(parent);
> +
> +	for (fn = 0; fn < 8; fn++) {
> +		dev = pci_get_slot(parent, PCI_DEVFN(0, fn));
> +		if (!dev)
> +			continue;
> +		if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
> +			pci_dev_put(dev);
> +			continue;
> +		}
> +		pci_configure_slot(dev);
> +		pci_dev_put(dev);
> +	}
> +
>  	return 0;
>  }
>  
> Index: linux-2.6/drivers/pci/setup-bus.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/setup-bus.c
> +++ linux-2.6/drivers/pci/setup-bus.c
> @@ -27,6 +27,44 @@
>  #include <linux/slab.h>
>  #include "pci.h"
>  
> +static void pdev_assign_resources_sorted(struct pci_dev *dev)
> +{
> +	struct resource *res;
> +	struct resource_list head, *list, *tmp;
> +	int idx;
> +	u16 class = dev->class >> 8;
> +
> +	head.next = NULL;
> +
> +	/* Don't touch classless devices or host bridges or ioapics.  */
> +	if (class == PCI_CLASS_NOT_DEFINED ||
> +	    class == PCI_CLASS_BRIDGE_HOST)
> +		return;
> +
> +	/* Don't touch ioapic devices already enabled by firmware */
> +	if (class == PCI_CLASS_SYSTEM_PIC) {
> +		u16 command;
> +		pci_read_config_word(dev, PCI_COMMAND, &command);
> +		if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
> +			return;
> +	}
> +
> +	pdev_sort_resources(dev, &head);
> +
> +	for (list = head.next; list;) {
> +		res = list->res;
> +		idx = res - &list->dev->resource[0];
> +		if (pci_assign_resource(list->dev, idx)) {
> +			res->start = 0;
> +			res->end = 0;
> +			res->flags = 0;
> +		}
> +		tmp = list;
> +		list = list->next;
> +		kfree(tmp);
> +	}
> +}
> +
>  static void pbus_assign_resources_sorted(const struct pci_bus *bus)
>  {
>  	struct pci_dev *dev;
> @@ -144,9 +182,6 @@ static void pci_setup_bridge(struct pci_
>  	u32 l, bu, lu, io_upper16;
>  	int pref_mem64;
>  
> -	if (pci_is_enabled(bridge))
> -		return;
> -
>  	dev_info(&bridge->dev, "PCI bridge, secondary bus %04x:%02x\n",
>  		 pci_domain_nr(bus), bus->number);
>  
> @@ -550,6 +585,35 @@ void __ref pci_bus_size_bridges(struct p
>  }
>  EXPORT_SYMBOL(pci_bus_size_bridges);
>  
> +void __ref pci_bridge_assign_resources(const struct pci_dev *bridge)
> +{
> +	struct pci_bus *b;
> +
> +	pdev_assign_resources_sorted((struct pci_dev *)bridge);
> +
> +	b = bridge->subordinate;
> +	if (!b)
> +		return;
> +
> +	pci_bus_assign_resources(b);
> +
> +	switch (bridge->class >> 8) {
> +	case PCI_CLASS_BRIDGE_PCI:
> +		pci_setup_bridge(b);
> +		break;
> +
> +	case PCI_CLASS_BRIDGE_CARDBUS:
> +		pci_setup_cardbus(b);
> +		break;
> +
> +	default:
> +		dev_info(&bridge->dev, "not setting up bridge for bus "
> +			 "%04x:%02x\n", pci_domain_nr(b), b->number);
> +		break;
> +	}
> +}
> +EXPORT_SYMBOL(pci_bridge_assign_resources);
> +
>  void __ref pci_bus_assign_resources(const struct pci_bus *bus)
>  {
>  	struct pci_bus *b;
> Index: linux-2.6/include/linux/pci.h
> ===================================================================
> --- linux-2.6.orig/include/linux/pci.h
> +++ linux-2.6/include/linux/pci.h
> @@ -756,6 +756,7 @@ ssize_t pci_write_vpd(struct pci_dev *de
>  int pci_vpd_truncate(struct pci_dev *dev, size_t size);
>  
>  /* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */
> +void pci_bridge_assign_resources(const struct pci_dev *bridge);
>  void pci_bus_assign_resources(const struct pci_bus *bus);
>  void pci_bus_size_bridges(struct pci_bus *bus);
>  int pci_claim_resource(struct pci_dev *, int);
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> 


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ