The Common Clock Configuration (CCC) is a PCIe feature for cases where
the upstream and downstream device of a link share the same reference
clock. After a change in this setting a link re-training is mandatory
to make it effective.
On recent Intel platforms (tested on Elkhart Lake) the FSP code which is
executed before coreboot performs the PCI scan already enumerates all
PCI buses for its internal uses. While this is done, all the PCI express
features of a link are configured, which includes CCC. If the link
supports common clock, FSP performs the link re-training already. When the
execution flow is returned to coreboot, the same link treatment is
applied again (coded in 'pciexp_tune_dev()') and CCC is enabled a second
time, just a few milliseconds after FSP did this already.
Because enabling CCC requires a link re-training, there are two link
re-trainings on the PCIe link within a few milliseconds (one from the FSP
code and one from coreboot) which can lead to issues with a connected
PCIe device on this link. In particular, link issues were discovered
with a Pericom PCIe switch (PI7C9X2G608) on mc_ehl1 where the link has
stalled for a while after the second re-training. This in turn leads to
non-initialized PCI devices on the bus after coreboot has finished.
This patch checks if CCC is already enabled on a link and does not
perform the steps to enable it again in coreboot which safes a link
re-training (and thus execution time) and a potential link stability
issue.
Test=Check log output on mc_ehl1 which shows the following lines:
[DEBUG] PCI: pci_scan_bus for bus 09
[DEBUG] PCI: 09:00.0 [8086/1533] enabled
[INFO ] PCIe: Common Clock Configuration already enabled
Change-Id: I747fa406a120a215de189d7252f160c8ea2e3716
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73310
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Add pcie_find_dsn() to detect and match PCIe device serial
number. In addition, vendor ID is matched when provided.
Change-Id: I54b6dc42c8da47cd7b4447ab23a6a21562c7618
Signed-off-by: Jonathan Zhang <jonzhang@meta.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54510
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>
Refer to PCI Express Base rev6.0 v1.0, 4.2.7 Link Training and Status
State Rules, Lane Error Status is normal to record the error when link
training. To make sure Lane Error Status is correct in OS runtime,
add a Kconfig PCIEXP_LANE_ERR_STAT_CLEAR that clears the PCIe lane error
status register at the end of PCIe link training.
Test=On Crater Lake, lspci -vvv shows
bb:01.0 PCI bridge: Intel Corporation Device 352a (rev 03)
(prog-if 00 [Normal decode])
Capabilities: [a30 v1] Secondary PCI Express
LnkCtl3: LnkEquIntrruptEn- PerformEqu-
LaneErrStat: LaneErr at lane: 0
Signed-off-by: Wilson Chou <Wilson.Chou@quantatw.com>
Change-Id: I6344223636409d8fc25e365a6375fc81e69f41a5
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67264
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Zhang <jonzhang@fb.com>
The `IORESOURCE_ABOVE_4G` flag was only explicitly set for our dummy
device that reserves resources behind a hotplug port. The current re-
source allocator implicitly extends this to all devices below the port,
including real ones. Let's make that explicit, so future changes to the
allocator can't break this rule.
Change-Id: Id4c90b60682cf5c8949cde25362d286625b3e953
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66719
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
If we have a PCIe root port without `ops_pci` or without
`get_ltr_max_latencies`, the parent device wouldn't be PCI.
Hence, check for a PCI path early.
Change-Id: I358cb6756750bb10d0a23ab7133b917bfa25988b
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66845
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Zhang <jonzhang@fb.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
The PCIe spec explicitly states that the bottom-two bits of the next
offset are reserved for future use and should be masked. We can also
change the loop condition to avoid wrong offsets below 0x100 (exten-
ded capabilities always reside in the extended config space).
The whole patch series was tested on Google Samus and keeps the L1ss
configuration of the WiFi device in tact.
Change-Id: I0b622a0ce0a4a1127d266226ade0ec1e66e9fb79
Signed-off-by: Nico Huber <nico.h@gmx.de>
Tested-by: Patrick Georgi <patrick@coreboot.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66459
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Add some inline functions for the bit-wise operations, change the loop
body to an if-bail-out style and remove stateful variables.
Change-Id: Ia8db915f375737064e3486d313383d9b6c3eb2b8
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66458
Reviewed-by: Bill XIE <persmule@hardenedlinux.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Keeping these checks in generic code seems rather dangerous.
In theory, it could lead to endless loops even for compliant
devices, if we accidentally detect arbitrary register contents
as capability and use them as a pointer to another one. Not
to forget that the register reads can have side effects.
All users of this `cafe` have been converted to use
pciexp_find_ext_vendor_cap().
Change-Id: I70d21534e04282a4156572a290b83c46be085e0c
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66456
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
We have this quirk in our tree since the introduction of L1-substate
support[1]. The way we searched for this capability was rather crude:
We simply assumed that it would show up in the first data word of
another capability.
As it turned out that it is actually a proper vendor-specific capa-
bility that we are looking for, we can drop some of the mystic code.
This was confirmed to work on the device that was originally used
during development, Google/Samus.
[1] commit 31c6e632cf (PCIe: Add L1 Sub-State support.)
Change-Id: I886fb96e9a92387bc0e2a7feb746f7842cee5476
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66455
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Vendors can choose to add non-standard capabilities inside a
Vendor-Specific Extended Capability. These are identified by
the Extended Capability ID 0x0b.
Change-Id: Idd6dd0e98bd53b19077afdd4c402114578bec966
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66454
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Move the `offset` parameter into pciexp_find_extended_cap(). If it's
called with `0`, we start a new search. If it's an existing offset,
we continue the search.
This makes it easier to search for multiple occurences of a capa-
bility in a single loop.
Change-Id: I80115372a82523b90460d97f0fd0fa565c3f56cb
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66453
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
If we already encountered the last extended capability in the
list, we'd call pciexp_get_ext_cap_offset() with `offset == 0`.
So it also needs to check if the passed offset is valid.
As there were no callers of pciexp_find_next_extended_cap()
yet, pciexp_get_ext_cap_offset() was only ever called with
`PCIE_EXT_CAP_OFFSET`.
Change-Id: I155c4691a34ff16661919913a3446fa915ac535e
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66452
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Bill XIE <persmule@hardenedlinux.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Looking into pciexp_get_ext_cap_offset() it seems a little hackish
and prone to endless loops. Either it should limit the loop or bail
out when pci_read_config32() returns 0xffffffff, meaning "Unsupported
Requests".
This commit fixes an endless loop when the queried PCIe device is
downstream of a legacy PCI bus which doesn't support extended config
space, thus pci_read_config32() will return 0xffffffff, for example,
the combination below with CONFIG_PCIEXP_SUPPORT_RESIZABLE_BARS
enabled.
TEST=Build and boot to OS in ASUS P8C WS with the following
peripherals and CONFIG_PCIEXP_SUPPORT_RESIZABLE_BARS enabled:
00:1c.4 PCI bridge [0604]: Intel Corporation 7 Series/C210 Series
Chipset Family PCI Express Root Port 5 [8086:1e18] (rev c4)
00:1c.4/00.0 SATA controller [0106]: Marvell Technology Group Ltd.
88SE9170 PCIe 2.0 x1 2-port SATA 6 Gb/s Controller [1b4b:9170]
(rev 13)
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 PCI Bridge
[8086:244e] (rev a4)
00:1e.0/00.0 PCI bridge [0604]: PLX Technology, Inc. PEX 8111 PCI
Express-to-PCI Bridge [10b5:8111] (rev 21)
00:1e.0/03.0 FireWire (IEEE 1394) [0c00]: VIA Technologies, Inc.
VT6306/7/8 [Fire II(M)] IEEE 1394 OHCI Controller [1106:3044]
(rev c0)
00:1e.0/00.0/00.0 Network controller [0280]: Qualcomm Atheros AR93xx
Wireless Network Adapter [168c:0030] (rev 01)
with 00:1c.4/00.0 being successfully tuned with pciexp_tune_dev(), and
00: 1e.0/00.0/00.0 not tuned as expected.
Change-Id: Ibb92548c47288b40e851fcc0a8a37937e8bdbf3c
Signed-off-by: Bill XIE <persmule@hardenedlinux.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66439
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
'parent_cap' should be found from 'parent' instead of 'dev'.
Signed-off-by: Bill XIE <persmule@hardenedlinux.org>
Change-Id: I99dab83d90287ca924d30dc4aeac0ff96e877e5c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66385
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Without setting the set_resources field for pciexp_hotplug_dummy_ops,
we will get an error during pciexp_hotplug_dummy.
[ERROR] NONE missing set_resources
Because the set_resources field is considered mandatory, explicitly set
it as no-op noop_set_resources.
BUG=b:220639445
TEST=emerge-brya coreboot
Signed-off-by: John Su <john_su@compal.corp-partner.google.com>
Change-Id: Ifee7479c69cf16025dbd4e3924056ed7f8e253cf
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63101
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Some PCIe devices have extended capability lists that contain
multiples instances of the same capability. This patch provides a
function similar to pciexp_find_extended_cap that can be used to
search through multiple instances of the same capability by returning
the offset of the next extended capability of the given type following
the passed-in offset. The base functionality of searching for a given
capability from an offset is extracted to a local helper function and
both pciexp_find_extended_cap and pciexp_find_next_extended_cap use
this helper.
Change-Id: Ie68dc26012ba57650484c4f2ff53cc694a5347aa
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57784
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
The object pointed to by the struct device * argument is not modified,
therefore it can be made const.
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: I300d2a59eb0513ddd08d4f1d2a3c6eb829e3f836
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61214
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Some device drivers may need to get access to the LTR values for their
respective devices, therefore export this function instead of marking it
static.
BUG=b:204343849
Change-Id: Id372600e8adec0d55d3483726bb9353139685774
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60015
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
I was bugged by spurious "Failed to enable LTR" messages for years.
Looking at the the current algorithm, it is flawed in multiple ways:
* It looks like the author didn't know they implemented a
recursive algorithm (pciexp_enable_ltr()) inside another
recursive algorithm (pciexp_scan_bridge()). Thus, at every
tree level, everything is run again for the whole sub-
tree.
* LTR is enabled no matter if `.set_ltr_max_latencies` is
implemented or not. Leaving the endpoints' LTR settings
at 0: They are told to always report zero tolerance.
In theory, depending on the root-complex implementation,
this may result in higher power consumption than without
LTR messages.
* `.set_ltr_max_latencies` is only considered for the direct
parent of a device. Thus, even with it implemented, an
endpoint below a (non-root) bridge may suffer from the 0
settings as described above.
* Due to the double-recursive nature, LTR is enabled starting
with the endpoints, then moving up the tree, while the PCIe
spec tells us to do it in the exact opposite order.
With the current implementation of pciexp_scan_bridge(), it is
hard to hook anything in that runs for each device from top to
bottom. So the proposed solution still adds some redundancy:
First, for every device that uses pciexp_scan_bus(), we enable
LTR if possible (see below). Then, when returning from the bus-
scanning recursion, we enable LTR for every device and configure
the maximum latencies (if supported). The latter runs again on
all bridges, because it's hard to know if pciexp_scan_bus() was
used for them.
When to enable LTR:
* For all devices that implement `.set_ltr_max_latencies`.
* For all devices below a bridge that has it enabled already.
Change-Id: I2c5b8658f1fc8cec15e8b0824464c6fc9bee7e0e
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51328
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Let the linker do its job.
This fixes building with !CONFIG_PCIEXP_HOTPLUG on some platforms.
Change-Id: I46560722dcb5f1d902709e40b714ef092515b164
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51417
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
This change allows a generic device to be described in the devicetree
under a PCI device, such as a root port.
Previously any device under a PCI device was expected to also be a PCI
device and that does not allow for a virtual/generic device to be
present, for example to provide ACPI properties for a root port.
The changes are:
- Ignore non-PCI devices found under a PCI device when scanning and do
not print an error for each devfn scanned.
- Don't treat non-PCI devices as leftover and remove them, instead
enable them as a static device.
- Don't attempt to configure a static device in the tree that is not a
PCIe device type.
With these changes it is now possible to have a generic device under a
PCI device, for example in a USB4/TBT root port (PCIe hotplug device)
this generic device will add ACPI properties for the PCIe tunnel routed
to the external port:
device pci 07.0 on
chip soc/intel/common/block/pcie
device generic 0 on end
end
end
TEST=boot on volteer with the USB4 root port devices in chipset.cb and
ensure they are enabled properly and there are no errors printed in the
coreboot log, and that the device properties are created in the SSDT.
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Change-Id: I56a491808067dc862a7adfd46852f0bd6b41cd95
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46542
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This reverts commit e15f352039a371156ceef37f0434003228166e99.
Reason for revert: Resource allocator is split into old(v3) and
new(v4). So, this change to provide an option to allocate prefetch
memory above 4G boundary can be added back. Since the support for
allocating above 4G boundary is available only in resource allocator
v4, Kconfig option is accordingly updated to add depends on
RESOURCE_ALLOCATOR_V4.
Change-Id: I94e5866458c79c2719fd780f336fb5da71a7df66
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41467
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This reverts commit dcbf6454b6.
Reason for revert: Resource allocator patches need to be reverted
until the AMD chipsets can be fixed to handle the resource allocation
flow correctly.
Change-Id: I58c9fff1a18ea1c9941e29c2c6e60e338c517c30
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41465
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Mike Banon <mikebdp2@gmail.com>
This change adds a Kconfig option to request allocation of prefetch
memory for hotplug devices above the 4G boundary. In order to
select this option by default and still allow users to disable this if
required, another option is added to request allocation of prefetch
memory below 4G boundary which defaults to n but can be overriden
by mainboards.
Without this change, if the number of pciexp bridges supporting
hot-plug is more than 4 or if the reserved prefetch memory size for
hot-plug cases was increased, then the resource allocator would fail
to satisfy the resource requirement below 4G boundary.
BUG=b:149186922
TEST=Enabled resource allocation above 4G for prefetch memory on volteer
and verified that it gets allocated above 4G boundary.
Signed-off-by: Furquan Shaikh <furquan@google.com>
Change-Id: I061d935eef9fcda352230b03b5cf14e467924e50
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39489
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Stefan thinks they don't add value.
Command used:
sed -i -e '/file is part of /d' $(git grep "file is part of " |egrep ":( */\*.*\*/\$|#|;#|-- | *\* )" | cut -d: -f1 |grep -v crossgcc |grep -v gcov | grep -v /elf.h |grep -v nvramtool)
The exceptions are for:
- crossgcc (patch file)
- gcov (imported from gcc)
- elf.h (imported from GNU's libc)
- nvramtool (more complicated header)
The removed lines are:
- fmt.Fprintln(f, "/* This file is part of the coreboot project. */")
-# This file is part of a set of unofficial pre-commit hooks available
-/* This file is part of coreboot */
-# This file is part of msrtool.
-/* This file is part of msrtool. */
- * This file is part of ncurses, designed to be appended after curses.h.in
-/* This file is part of pgtblgen. */
- * This file is part of the coreboot project.
- /* This file is part of the coreboot project. */
-# This file is part of the coreboot project.
-# This file is part of the coreboot project.
-## This file is part of the coreboot project.
--- This file is part of the coreboot project.
-/* This file is part of the coreboot project */
-/* This file is part of the coreboot project. */
-;## This file is part of the coreboot project.
-# This file is part of the coreboot project. It originated in the
- * This file is part of the coreinfo project.
-## This file is part of the coreinfo project.
- * This file is part of the depthcharge project.
-/* This file is part of the depthcharge project. */
-/* This file is part of the ectool project. */
- * This file is part of the GNU C Library.
- * This file is part of the libpayload project.
-## This file is part of the libpayload project.
-/* This file is part of the Linux kernel. */
-## This file is part of the superiotool project.
-/* This file is part of the superiotool project */
-/* This file is part of uio_usbdebug */
Change-Id: I82d872b3b337388c93d5f5bf704e9ee9e53ab3a9
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41194
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Unmentioned fields are initialized with 0 (or NULL) implicitly. Beside
that, the struct has grown over the years. There are too many optional
fields to list them all.
Change-Id: Icb9e14c58153d7c14817bcde148e86e977666e4b
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40126
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Done with sed and God Lines. Only done for C-like code for now.
Change-Id: Id5fe26564147ec532850430ea55b19ee94d5c5a5
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40050
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
This change adds support for allocating resources for PCI express hotplug
bridges when PCIEXP_HOTPLUG is selected. By default, this will add 32 PCI
subordinate numbers (buses), 256 MiB of prefetchable memory, 8 MiB of
non-prefetchable memory, and 8 KiB of I/O space to any device with the
PCI_EXP_SLTCAP_HPC bit set in the PCI_EXP_SLTCAP register, which
indicates hot-plugging capability. The resource allocation is configurable,
please see the PCIEXP_HOTPLUG_* variables in src/device/Kconfig.
In order to support the allocation of hotplugged PCI buses, a new field
is added to struct device called hotplug_buses. This is defaulted to
zero, but when set, it adds the hotplug_buses value to the subordinate
value of the PCI bridge. This allows devices to be plugged in and
unplugged after boot.
This code was tested on the System76 Darter Pro (darp6). Before this
change, there are not enough resources allocated to the Thunderbolt
PCI bridge to allow plugging in new devices after boot. This can be
worked around in the Linux kernel by passing a boot param such as:
pci=assign-busses,hpbussize=32,realloc
This change makes it possible to use Thunderbolt hotplugging without
kernel parameters, and attempts to match closely what our motherboard
manufacturer's firmware does by default.
Signed-off-by: Jeremy Soller <jeremy@system76.com>
Change-Id: I500191626584b83e6a8ae38417fd324b5e803afc
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35946
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Ends of a PCIe link may advertise different Max_Payload_Size in
their PCIe Express Capabilities, Device Capabilities block.
For correct operation, both ends of the link need to have their
Device Control Max_Payload_Size programmed to match and not
exceed the other end's Device Capabilities.
Fixes: https://ticket.coreboot.org/issues/218
Change-Id: I8b1de13e9c73abb30e5ccc792918bb4f81e5fe84
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37769
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
As discussed on the mailing list and voted upon, the coreboot project
is going to move the majority of copyrights out of the headers and into
an AUTHORS file. This will happen a bit at a time, as we'll be unifying
license headers at the same time.
Additional cleanup - Unify "Inc" to "Inc." and "LLC." to "LLC"
Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: Ie03a3ce1f6085494bd5f38da76e2467970cf301a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35430
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
This patch is a raw application of
find src/ -type f | xargs sed -i -e 's/IS_ENABLED\s*(CONFIG_/CONFIG(/g'
Change-Id: I6262d6d5c23cabe23c242b4f38d446b74fe16b88
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31774
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Use of `device_t` has been abandoned in ramstage.
Change-Id: I82b73e1698d8d44e32ad9f21e575a7fce35baa1c
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/26003
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
For broken devices that spuriously advertise ASPM, make it possible to
decide ASPM activation in the device driver.
Change-Id: I491aa32a3ec954be87a474478609f0f3971d0fdf
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/25617
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Move inline function where they belong to. Fixes compilation
on non x86 platforms.
Change-Id: Ia05391c43b8d501bd68df5654bcfb587f8786f71
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/25720
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
As noted on linux-pci, we have a weird way to handling "value" and
"scale" fields that are supposed to contain numerical values: we encode
them as a bitfield.
Instead define the two fields (offset and mask) and use numbers.
Another issue, not fixed in this CL, is that we write hard-coded values
while these fields really need to contain the max() of acceptable delays
of the downstream devices. That way the controller can decide whether or
not to enter a deeper power management state. It's noted as a TODO.
Change-Id: I895b9fe2ee438d3958c2d787e70a84d73eaa49d2
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Found-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-on: https://review.coreboot.org/22740
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This patch moves out LTR programming under L1 substate
to pchexp_tune_device function, as substate programming
and LTR programming are independent.
LTR programming scheme is updated to scan through entire
tree and enable LTR mechanism on pci device if LTR mechanism
is supported by device.
BRANCH=none
BUG=b:66722364
TEST=Verify LTR is configured for end point devices and max
snoop latency gets configured.
Change-Id: I6be99c3b590c1457adf88bc1b40f128fcade3fbe
Signed-off-by: Aamir Bohra <aamir.bohra@intel.com>
Reviewed-on: https://review.coreboot.org/21868
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
The Role-Based Error Reporting is not a configurable field,
it's a read only field in the Device Capability register.
This code was old and comes from commit f6eb88ad but evidently
is not useful in any way. The PCIe Specification [1] states
that it's read-only and must always be set to 1.
I have also done tests on purism/librem13 hardware, trying to
change that value, without any success.
[1]: PCI Express Base Specification Revision 3.0
Page 612
Change-Id: I729617a5c6f4f52dfc4c422df78379b309066399
Signed-off-by: Youness Alaoui <youness.alaoui@puri.sm>
Reviewed-on: https://review.coreboot.org/19901
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
Reviewed-by: Martin Roth <martinroth@google.com>
The PCIe specification[1] describes a race condition that
can occur when using the Retrain Link bit in the Link
Control Register.
The race condition is avoided by checking the retrain link
bit in the link status register and waiting until it is
set to 0, before initiating a new link retraining.
[1] PCI Express Base Specification Revision 3.0
Page 633
Change-Id: I9d5840fb9a6e63838b5a4084d3bbe483f1d870ed
Signed-off-by: Youness Alaoui <youness.alaoui@puri.sm>
Reviewed-on: https://review.coreboot.org/19556
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Martin Roth <martinroth@google.com>
Some PCI-e capability registers are located starting from
0x100, these are not accessible using the conventional
PCI IO config operations at 0xcf8/0xcfc, unless PCI_CFG_EXT_IO
was selected.
Thus any feature that calls pciexp_find_extended_cap()
depends on either MMCONF_SUPPORT_DEFAULT or PCI_CFG_EXT_IO
being enabled on the platform.
In theory there can be system without MMCONF_SUPPORT, but
with complete PCI Express configuration space available
using PCI_CFG_EXT_IO. Do not use explicit PCI MMCONF
operations here, but rely on the default PCI access
method to be able to access all of the configuration space.
While at it, convert to IS_ENABLED() everywhere in the source
and organize Kconfig file better.
Change-Id: Ica6e16d2fb2adc532e644c4b2c47806490235715
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17546
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Error reporting can be enabled together with ASPM, there
is no other use for function return value.
Change-Id: I58081fac0df5205a5aea65d735d34b375c2af9cd
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17654
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
It encourages users from writing to the FSF without giving an address.
Linux also prefers to drop that and their checkpatch.pl (that we
imported) looks out for that.
This is the result of util/scripts/no-fsf-addresses.sh with no further
editing.
Change-Id: Ie96faea295fe001911d77dbc51e9a6789558fbd6
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/11888
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This reverts commit 785b3eb6e8.
The commit re-tuned the upstream link again, it does not tune secondary side.
Change-Id: I9be70e95b06ceff99beba8a7c7eb6402b32fcca1
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/12253
Reviewed-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Peter Stuge <peter@stuge.se>
