From: Bjorn Helgaas <helgaas@kernel.org>
To: "Antti Järvinen" <antti.jarvinen@gmail.com>
Cc: alex.williamson@redhat.com, bhelgaas@google.com, kishon@ti.com,
kw@linux.com, linux-kernel@vger.kernel.org,
linux-pci@vger.kernel.org, m-karicheri2@ti.com
Subject: Re: [PATCH v4] PCI: Add quirk for preventing bus reset on TI C667X
Date: Thu, 27 May 2021 18:07:23 -0500 [thread overview]
Message-ID: <20210527230723.GA1441318@bjorn-Precision-5520> (raw)
In-Reply-To: <20210315102606.17153-1-antti.jarvinen@gmail.com>
On Mon, Mar 15, 2021 at 10:26:06AM +0000, Antti Järvinen wrote:
> Some TI KeyStone C667X devices do not support bus/hot reset. Its PCIESS
> automatically disables LTSSM when secondary bus reset is received and
> device stops working. Prevent bus reset by adding quirk_no_bus_reset to
> the device. With this change device can be assigned to VMs with VFIO,
> but it will leak state between VMs.
>
> Reference: https://e2e.ti.com/support/processors/f/791/t/954382
> Signed-off-by: Antti Järvinen <antti.jarvinen@gmail.com>
Applied to pci/virtualization for v5.14 with subject
PCI: Mark TI C667X to avoid bus reset
Thanks!
> ---
> drivers/pci/quirks.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 653660e3ba9e..d9201ad1ca39 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -3578,6 +3578,16 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0034, quirk_no_bus_reset);
> */
> DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CAVIUM, 0xa100, quirk_no_bus_reset);
>
> +/*
> + * Some TI keystone C667X devices do no support bus/hot reset.
> + * Its PCIESS automatically disables LTSSM when secondary bus reset is
> + * received and device stops working. Prevent bus reset by adding
> + * quirk_no_bus_reset to the device. With this change device can be
> + * assigned to VMs with VFIO, but it will leak state between VMs.
> + * Reference https://e2e.ti.com/support/processors/f/791/t/954382
> + */
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TI, 0xb005, quirk_no_bus_reset);
> +
> static void quirk_no_pm_reset(struct pci_dev *dev)
> {
> /*
> --
> 2.17.1
>
next prev parent reply other threads:[~2021-05-27 23:07 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-12 15:36 [PATCH] PCI: quirk for preventing bus reset on TI C667X Antti Järvinen
2021-01-21 23:55 ` Bjorn Helgaas
2021-01-26 11:22 ` Antti Järvinen
2021-01-29 23:49 ` Bjorn Helgaas
2021-02-17 21:18 ` Bjorn Helgaas
2021-02-28 13:53 ` [PATCH v2] " Antti Järvinen
2021-03-07 0:22 ` Krzysztof Wilczyński
2021-03-08 14:21 ` [PATCH v3] PCI: Add " Antti Järvinen
2021-03-12 21:09 ` Bjorn Helgaas
2021-03-15 10:26 ` [PATCH v4] " Antti Järvinen
2021-04-19 12:44 ` Kishon Vijay Abraham I
2021-05-27 23:07 ` Bjorn Helgaas [this message]
2021-03-15 10:45 ` [PATCH v3] " Antti Järvinen
2021-03-08 14:28 ` [PATCH v2] PCI: " Antti Järvinen
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