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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Oliver O'Halloran <oohall@gmail.com>
Cc: Rajat Jain <rajatja@google.com>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Heikki Krogerus <heikki.krogerus@linux.intel.com>,
	David Woodhouse <dwmw2@infradead.org>,
	Lu Baolu <baolu.lu@linux.intel.com>,
	Joerg Roedel <joro@8bytes.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>,
	"open list:AMD IOMMU (AMD-VI)" <iommu@lists.linux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux PCI <linux-pci@vger.kernel.org>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	Raj Ashok <ashok.raj@intel.com>,
	"Krishnakumar,
	Lalithambika" <lalithambika.krishnakumar@intel.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	Prashant Malani <pmalani@google.com>,
	Benson Leung <bleung@google.com>, Todd Broch <tbroch@google.com>,
	Alex Levin <levinale@google.com>,
	Mattias Nissler <mnissler@google.com>,
	Rajat Jain <rajatxjain@gmail.com>,
	Bernie Keany <bernie.keany@intel.com>,
	Aaron Durbin <adurbin@google.com>,
	Diego Rivas <diegorivas@google.com>,
	Duncan Laurie <dlaurie@google.com>,
	Furquan Shaikh <furquan@google.com>,
	Jesse Barnes <jsbarnes@google.com>,
	Christian Kellner <christian@kellner.me>,
	Alex Williamson <alex.williamson@redhat.com>,
	Saravana Kannan <saravanak@google.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Arnd Bergmann <arnd@arndb.de>
Subject: Re: [PATCH v2 5/7] driver core: Add device location to "struct device" and expose it in sysfs
Date: Thu, 2 Jul 2020 10:52:12 +0200
Message-ID: <20200702085212.GA1089671@kroah.com> (raw)
In-Reply-To: <24f56c0ed6d10ef565cf83d47d0538d37ac0d8ef.camel@gmail.com>

On Thu, Jul 02, 2020 at 06:40:09PM +1000, Oliver O'Halloran wrote:
> On Thu, 2020-07-02 at 09:32 +0200, Greg Kroah-Hartman wrote:
> > On Thu, Jul 02, 2020 at 03:23:23PM +1000, Oliver O'Halloran wrote:
> > > Yep, that's a problem. If we want to provide a useful mechanism to
> > > userspace then the default behaviour of the kernel can't undermine
> > > that mechanism. If that means we need another kernel command line
> > > parameter then I guess we just have to live with it.
> > 
> > I really do not want yet-another-kernel-command-line-option if we can
> > help it at all.  Sane defaults are the best thing to do here.  Userspace
> > comes up really early, put your policy in there, not in blobs passed
> > from your bootloader.
> 
> Userspace comes up early, but builtin drivers will bind before init is
> started. e.g.
> 
> # dmesg | egrep '0002:01:00.0|/init'
> [    0.976800][    T1] pci 0002:01:00.0: [8086:1589] type 00 class 0x020000
> [    0.976923][    T1] pci 0002:01:00.0: reg 0x10: [mem 0x220000000000-0x2200007fffff 64bit pref]
> [    0.977004][    T1] pci 0002:01:00.0: reg 0x1c: [mem 0x220002000000-0x220002007fff 64bit pref]
> [    0.977068][    T1] pci 0002:01:00.0: reg 0x30: [mem 0x00000000-0x0007ffff pref]
> [    0.977122][    T1] pci 0002:01:00.0: BAR3 [mem size 0x00008000 64bit pref]: requesting alignment to 0x10000
> [    0.977401][    T1] pci 0002:01:00.0: PME# supported from D0 D3hot
> [    1.011929][    T1] pci 0002:01:00.0: BAR 0: assigned [mem 0x220000000000-0x2200007fffff 64bit pref]
> [    1.012085][    T1] pci 0002:01:00.0: BAR 6: assigned [mem 0x3fe100000000-0x3fe10007ffff pref]
> [    1.012127][    T1] pci 0002:01:00.0: BAR 3: assigned [mem 0x220002000000-0x220002007fff 64bit pref]
> [    4.399588][   T12] i40e 0002:01:00.0: enabling device (0140 -> 0142)
> [    4.410891][   T12] i40e 0002:01:00.0: fw 5.1.40981 api 1.5 nvm 5.03 0x80002469 1.1313.0 [8086:1589] [15d9:0000]
> [    4.647524][   T12] i40e 0002:01:00.0: MAC address: 0c:c4:7a:b7:fc:74
> [    4.647685][   T12] i40e 0002:01:00.0: FW LLDP is enabled
> [    4.653918][   T12] i40e 0002:01:00.0 eth0: NIC Link is Up, 1000 Mbps Full Duplex, Flow Control: None
> [    4.655552][   T12] i40e 0002:01:00.0: PCI-Express: Speed 8.0GT/s Width x8
> [    4.656071][   T12] i40e 0002:01:00.0: Features: PF-id[0] VSIs: 34 QP: 80 RSS FD_ATR FD_SB NTUPLE VxLAN Geneve PTP VEPA
> [   13.803709][    T1] Run /init as init process
> [   13.963242][  T711] i40e 0002:01:00.0 enP2p1s0f0: renamed from eth0
> 
> Building everything into the kernel is admittedly pretty niche. I only
> do it to avoid re-building the initramfs for my test kernels. It does
> seem relatively common on embedded systems, but I'm not sure how many
> of those care about PCIe. It would be nice to provide *something* to
> cover that case for the people who care.

Those people who care should not build those drivers into their kernel :)

  reply index

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-30  4:49 [PATCH v2 0/7] Tighten PCI security, expose dev location " Rajat Jain
2020-06-30  4:49 ` [PATCH v2 1/7] PCI: Keep the ACS capability offset in device Rajat Jain
2020-07-06 15:58   ` Bjorn Helgaas
2020-07-06 22:16     ` Rajat Jain
2020-07-06 23:18       ` Bjorn Helgaas
2020-06-30  4:49 ` [PATCH v2 2/7] PCI: Set "untrusted" flag for truly external devices only Rajat Jain
2020-06-30  7:38   ` Lu Baolu
2020-06-30  7:55   ` Greg Kroah-Hartman
2020-07-06 16:41     ` Bjorn Helgaas
2020-07-06 18:48       ` Greg Kroah-Hartman
2020-07-06 16:38   ` Bjorn Helgaas
2020-07-06 22:31     ` Rajat Jain
2020-07-06 23:30       ` Bjorn Helgaas
2020-07-06 23:40         ` Rajat Jain
2020-06-30  4:49 ` [PATCH v2 3/7] PCI/ACS: Enable PCI_ACS_TB for untrusted/external-facing devices Rajat Jain
2020-07-06 16:45   ` Bjorn Helgaas
2020-07-06 23:12     ` Rajat Jain
2020-07-06 17:07   ` Bjorn Helgaas
2020-07-06 23:19     ` Rajat Jain
2020-06-30  4:49 ` [PATCH v2 4/7] PCI: Add device even if driver attach failed Rajat Jain
2020-06-30  8:02   ` Greg Kroah-Hartman
2020-07-06 23:35     ` Rajat Jain
2020-06-30  4:49 ` [PATCH v2 5/7] driver core: Add device location to "struct device" and expose it in sysfs Rajat Jain
2020-06-30  8:01   ` Greg Kroah-Hartman
2020-06-30 10:49   ` Heikki Krogerus
2020-06-30 12:52     ` Greg Kroah-Hartman
2020-06-30 13:00       ` Rafael J. Wysocki
2020-06-30 15:38         ` Greg Kroah-Hartman
2020-06-30 16:08           ` Rafael J. Wysocki
2020-06-30 17:00             ` Greg Kroah-Hartman
2020-07-01 18:06               ` Rajat Jain
2020-07-02  5:23                 ` Oliver O'Halloran
2020-07-02  7:32                   ` Greg Kroah-Hartman
2020-07-02  8:40                     ` Oliver O'Halloran
2020-07-02  8:52                       ` Greg Kroah-Hartman [this message]
2020-07-02  8:53                         ` Greg Kroah-Hartman
2020-07-07  6:03                   ` Rajat Jain
2020-06-30 17:43   ` Saravana Kannan
2020-06-30  4:49 ` [PATCH v2 6/7] PCI: Move pci_dev->untrusted logic to use device location instead Rajat Jain
2020-06-30  7:39   ` Lu Baolu
2020-06-30  4:49 ` [PATCH v2 7/7] PCI: Add parameter to disable attaching external devices Rajat Jain
2020-07-04 11:44 ` [PATCH v2 0/7] Tighten PCI security, expose dev location in sysfs Pavel Machek
2020-07-06 22:18   ` Rajat Jain

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