From: Bjorn Helgaas <helgaas@kernel.org>
To: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc: bhelgaas@google.com, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org, ashok.raj@intel.com,
knsathya@kernel.org
Subject: Re: [PATCH v11 2/5] ACPI/PCI: Ignore _OSC negotiation result if pcie_ports_native is set.
Date: Wed, 25 Nov 2020 14:28:10 -0600 [thread overview]
Message-ID: <20201125202810.GA674732@bjorn-Precision-5520> (raw)
In-Reply-To: <bc87c9e675118960949043a832bed86bc22becbd.1603766889.git.sathyanarayanan.kuppuswamy@linux.intel.com>
On Mon, Oct 26, 2020 at 07:57:05PM -0700, Kuppuswamy Sathyanarayanan wrote:
> pcie_ports_native is set only if user requests native handling
> of PCIe capabilities via pcie_port_setup command line option.
> User input takes precedence over _OSC based control negotiation
> result. So consider the _OSC negotiated result only if
> pcie_ports_native is unset.
>
> Also, since struct pci_host_bridge ->native_* members caches the
> ownership status of various PCIe capabilities, use them instead
> of distributed checks for pcie_ports_native.
> diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
> index 50a9522ab07d..ccd5e0ce5605 100644
> --- a/drivers/pci/pcie/portdrv_core.c
> +++ b/drivers/pci/pcie/portdrv_core.c
> @@ -208,8 +208,7 @@ static int get_port_device_capability(struct pci_dev *dev)
> struct pci_host_bridge *host = pci_find_host_bridge(dev->bus);
> int services = 0;
>
> - if (dev->is_hotplug_bridge &&
> - (pcie_ports_native || host->native_pcie_hotplug)) {
> + if (dev->is_hotplug_bridge && host->native_pcie_hotplug) {
This is a nit, but I think this and similar checks should be reordered
so we do the most generic test first, i.e.,
if (host->native_pcie_hotplug && dev->is_hotplug_bridge)
Logically there's no point in looking at the device things if we
don't have native control.
> services |= PCIE_PORT_SERVICE_HP;
>
> /*
> @@ -221,8 +220,7 @@ static int get_port_device_capability(struct pci_dev *dev)
> }
>
> #ifdef CONFIG_PCIEAER
> - if (dev->aer_cap && pci_aer_available() &&
> - (pcie_ports_native || host->native_aer)) {
> + if (dev->aer_cap && pci_aer_available() && host->native_aer) {
Can't we clear host->native_aer when pci_aer_available() returns
false? I'd like to have all the checks about whether we have native
control to be in one place instead of being scattered. Something like
this above:
OSC_OWNER(ctrl, OSC_PCI_EXPRESS_AER_CONTROL, host_bridge->native_aer);
if (!pci_aer_available())
host_bridge->native_aer = 0;
So this test would become:
if (host->native_aer && dev->aer_cap)
> services |= PCIE_PORT_SERVICE_AER;
>
> /*
> @@ -238,8 +236,7 @@ static int get_port_device_capability(struct pci_dev *dev)
> * Event Collectors can also generate PMEs, but we don't handle
> * those yet.
> */
> - if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT &&
> - (pcie_ports_native || host->native_pme)) {
> + if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT && host->native_pme) {
> services |= PCIE_PORT_SERVICE_PME;
Also here:
if (host->native_pme && pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT)
next prev parent reply other threads:[~2020-11-25 20:28 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-27 2:57 [PATCH v11 0/5] Simplify PCIe native ownership detection logic Kuppuswamy Sathyanarayanan
2020-10-27 2:57 ` [PATCH v11 1/5] PCI: Conditionally initialize host bridge native_* members Kuppuswamy Sathyanarayanan
2020-10-28 6:09 ` Ethan Zhao
2020-10-28 17:14 ` Kuppuswamy, Sathyanarayanan
2020-10-27 2:57 ` [PATCH v11 2/5] ACPI/PCI: Ignore _OSC negotiation result if pcie_ports_native is set Kuppuswamy Sathyanarayanan
2020-11-25 20:12 ` Bjorn Helgaas
2020-11-25 22:21 ` Kuppuswamy, Sathyanarayanan
2020-11-25 22:25 ` Bjorn Helgaas
2020-11-25 22:38 ` Kuppuswamy, Sathyanarayanan
2020-11-25 20:28 ` Bjorn Helgaas [this message]
2020-11-26 0:58 ` Kuppuswamy, Sathyanarayanan
2020-10-27 2:57 ` [PATCH v11 3/5] ACPI/PCI: Ignore _OSC DPC negotiation result if pcie_ports_dpc_native " Kuppuswamy Sathyanarayanan
2020-11-25 20:50 ` Bjorn Helgaas
2020-10-27 2:57 ` [PATCH v11 4/5] PCI/portdrv: Remove redundant pci_aer_available() check in DPC enable logic Kuppuswamy Sathyanarayanan
2020-10-28 6:00 ` Ethan Zhao
2020-10-28 17:13 ` Kuppuswamy, Sathyanarayanan
2020-11-02 9:59 ` Ethan Zhao
2020-10-27 2:57 ` [PATCH v11 5/5] PCI/DPC: Move AER/DPC dependency checks out of DPC driver Kuppuswamy Sathyanarayanan
2020-11-13 21:59 ` [PATCH v11 0/5] Simplify PCIe native ownership detection logic Kuppuswamy, Sathyanarayanan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201125202810.GA674732@bjorn-Precision-5520 \
--to=helgaas@kernel.org \
--cc=ashok.raj@intel.com \
--cc=bhelgaas@google.com \
--cc=knsathya@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=sathyanarayanan.kuppuswamy@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).