From: Ronen Hod <rhod@redhat.com>
To: Marcel Apfelbaum <marcel.a@redhat.com>, linux-pci@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, bhelgaas@google.com,
matthew@wil.cx, mst@redhat.com
Subject: Re: [PATCH] PCI/shpchp: fix a bus speed issue on hotplug
Date: Sun, 04 May 2014 16:48:14 +0300 [thread overview]
Message-ID: <5366451E.1050800@redhat.com> (raw)
In-Reply-To: <1398954948-24219-1-git-send-email-marcel.a@redhat.com>
On 05/01/2014 05:35 PM, Marcel Apfelbaum wrote:
> When a board is added, the shpchp driver checks if there
> is a mismatch between the bridge's adapter and the bus speed.
> If there is, it sets the subordinate speed (if there is no device on it).
Since the speed is irrelevant when running in a VM, I suggest that
you either ignore it altogether, or "normalize" the speed of all the
devices/bridges/buses in QEMU in order to avoid any conflicts
in the first place.
Thanks, Ronen.
>
> However, it takes the reference of the board speed from the primary bus
> and not from the subordinate. If the primary bus is PCI and not PCIX/PCIe,
> its speed is not updated and remains 0xff. As a result hotplug fails
> with error: "Speed of bus ff and adapter 0 mismatch".
>
> Fixed that by checking the speed against the subordinate bus.
>
> Signed-off-by: Marcel Apfelbaum <marcel.a@redhat.com>
> Acked-by: Michael S. Tsirkin <mst@redhat.com>
> ---
> drivers/pci/hotplug/shpchp_ctrl.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/hotplug/shpchp_ctrl.c b/drivers/pci/hotplug/shpchp_ctrl.c
> index 5849927..6efc2ec 100644
> --- a/drivers/pci/hotplug/shpchp_ctrl.c
> +++ b/drivers/pci/hotplug/shpchp_ctrl.c
> @@ -282,8 +282,8 @@ static int board_added(struct slot *p_slot)
> return WRONG_BUS_FREQUENCY;
> }
>
> - bsp = ctrl->pci_dev->bus->cur_bus_speed;
> - msp = ctrl->pci_dev->bus->max_bus_speed;
> + bsp = ctrl->pci_dev->subordinate->cur_bus_speed;
> + msp = ctrl->pci_dev->subordinate->max_bus_speed;
>
> /* Check if there are other slots or devices on the same bus */
> if (!list_empty(&ctrl->pci_dev->subordinate->devices))
next prev parent reply other threads:[~2014-05-04 13:48 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-01 14:35 [PATCH] PCI/shpchp: fix a bus speed issue on hotplug Marcel Apfelbaum
2014-05-01 15:43 ` Michael S. Tsirkin
2014-05-01 18:02 ` Bjorn Helgaas
2014-05-01 18:13 ` Marcel Apfelbaum
2014-05-01 18:57 ` Marcel Apfelbaum
2014-05-01 20:00 ` Bjorn Helgaas
2014-05-01 20:36 ` Marcel Apfelbaum
2014-05-04 10:40 ` Marcel Apfelbaum
2014-05-04 13:48 ` Ronen Hod [this message]
2014-05-04 14:07 ` Marcel Apfelbaum
2014-05-15 18:41 ` Bjorn Helgaas
2014-05-17 18:47 ` Michael S. Tsirkin
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