After a ton of tedious work, I am pleased to finally introduce full
support for ConnectX-3 cards in iPXE!
The work has been done by finding all publicly available versions of
the Mellanox Flexboot sources, cleaning them up, synthesizing a git
history from them, cleaning out non-significant changes, and
correlating with the iPXE upstream git history.
After this, a proof-of-concept diff was produced, that allowed iPXE to
be compiled with rudimentary ConnectX-3 support. This diff was over
10k lines, and contained many changes that were not part of the core
driver.
Special thanks to Michael Brown <mcb30@ipxe.org> for answering my
barrage of questions, and helping brainstorm the development along the
way.
Signed-off-by: Christian Iversen <ci@iversenit.dk>
Michael Brown [Mon, 1 Feb 2021 23:32:34 +0000 (23:32 +0000)]
[autoboot] Avoid closing and immediately reopening network device
Some network devices can take a substantial time to close and reopen.
Avoid closing the device from which we are about to attempt booting,
in case it happens to be already open.
Suggested-by: Christian Iversen <ci@iversenit.dk> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown [Mon, 1 Feb 2021 22:25:52 +0000 (22:25 +0000)]
[hermon] Minimise reset time
Check for reset completion by waiting for the device to respond to PCI
configuration cycles, as documented in the Programmer's Reference
Manual. On the original ConnectX HCA, this reduces the time spent on
reset from 1000ms down to 1ms.
[hermon] Throttle debug output when sensing port type
When auto-detecting the initial port type, the Hermon driver will spam
the debug output without hesitation. Add a short delay in each
iteration to fix this.
Signed-off-by: Christian Iversen <ci@iversenit.dk>
Inspired by Flexboot, the function hermon_event_port_mgmnt_change() is
added to handle the HERMON_EV_PORT_MGMNT_CHANGE event type, which
updates the Infiniband subsystem.
Signed-off-by: Christian Iversen <ci@iversenit.dk> Modified-by: Michael Brown <mcb30@ipxe.org> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Hermon Ethernet work queues have more RX than TX entries, unlike most
other drivers. This is possibly the source of some stochastic
deadlocks previously experienced with this driver.
Update the sizes to be in line with other drivers, and make them
slightly larger for better performance. These new queue sizes have
been found to work well with ConnectX-3 hardware.
Signed-off-by: Christian Iversen <ci@iversenit.dk> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown [Mon, 1 Feb 2021 01:53:15 +0000 (01:53 +0000)]
[hermon] Use reset value suitable for ConnectX-3
The programming documentation states that the reset magic value is
"0x00000001 (Big Endian)", and the current code matches this by using
the value 0x01000000 for the implicitly little-endian writel().
Inspection of the FlexBoot source code reveals an exciting variety of
reset values, some suggestive of confusion around endianness.
Experimentation suggests that the value 0x01000001 works reliably
across a wide range of hardware.
Debugged-by: Christian Iversen <ci@iversenit.dk> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown [Sun, 31 Jan 2021 23:29:45 +0000 (23:29 +0000)]
[hermon] Limit link poll frequency in DOWN state
Some older versions of the hardware (and/or firmware) do not report an
event when an Infiniband link reaches the INIT state. The driver
works around this missing event by calling ib_smc_update() on each
event queue poll while the link is in the DOWN state.
Commit 6cb12ee ("[hermon] Increase polling rate for command
completions") addressed this by speeding up the time taken to issue
each command invoked by ib_smc_update(). Experimentation shows that
the impact is still significant: for example, in a situation where an
unplugged port is opened, the throughput on the other port can be
reduced by over 99%.
Fix by throttling the rate at which link polling is attempted.
Debugged-by: Christian Iversen <ci@iversenit.dk> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown [Sun, 31 Jan 2021 00:41:34 +0000 (00:41 +0000)]
[build] Avoid using awk to format build ID as hexadecimal
The version of awk used in FreeBSD seems to be incapable of formatting
unsigned 32-bit integers above 0x80000000 and will silently render any
such value as 0x80000000. For example:
Michael Brown [Sat, 30 Jan 2021 01:56:16 +0000 (01:56 +0000)]
[build] Check for broken elftoolchain version of objcopy
The elftoolchain version of objcopy (as used in FreeBSD) seems to be
unusable for generating a raw binary file, since it will apparently
ignore the load memory addresses specified for each section in the
input file.
The binutils version of objcopy may be used on FreeBSD by specifying
OBJCOPY=/usr/local/bin/objcopy
Detect an attempt to use the unusable elftoolchain version of objcopy
and report it as an error.
Michael Brown [Sat, 30 Jan 2021 01:35:27 +0000 (01:35 +0000)]
[build] Avoid modifying load addresses when stripping .zinfo section
Some versions of objcopy will spuriously complain when asked to
extract the .zinfo section since doing so will nominally alter the
load addresses of the (non-loadable) .bss.* sections.
Avoid these warnings by placing the .zinfo section at the very end of
the load memory address space.
Allocate non-overlapping load memory addresses for the (non-loadable)
.bss.* sections, in the hope of avoiding spurious warnings about
overlapping load addresses.
Manuel Mendez [Thu, 28 Jan 2021 21:45:04 +0000 (16:45 -0500)]
[build] Replace random build ID with a deterministic one
Calculate the build ID as a checksum over the input files. Since the
input files include $(BIN)/version.%.o which itself includes the build
target name (from which TGT_LD_FLAGS is calculated), this should be
sufficient to meet the requirement that the build ID be unique for
each $(BIN)/%.tmp even within the same build run.
Modified-by: Michael Brown <mcb30@ipxe.org> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Manuel Mendez [Fri, 29 Jan 2021 14:23:54 +0000 (09:23 -0500)]
[build] Use $(shell ...) to invoke BUILD_ID_CMD
When using $(shell), make will first invoke BUILD_ID_CMD and then have
the value defined when calling $(LD). This means we get to see the
_build_id when building with make V=1. Previously the build_id was
figured out as a subshell command run during the recipe execution
without being able to see the build_id itself.
Michael Brown [Sat, 30 Jan 2021 00:11:33 +0000 (00:11 +0000)]
[build] Allow elf2efi.c to build on FreeBSD
The elf.h on FreeBSD defines ELF_R_TYPE and ELF_R_SYM (based on the
host platform) and omits some but not all of the AArch64 relocation
types.
Fix by undefining ELF_R_TYPE and ELF_R_SYM in favour of our own
definitions, and by placing each potentially missing relocation type
within an individual #ifdef guard.
[hermon] Perform clean MPT unmap on device shutdown
This change is ported from Flexboot sources. When stopping a Hermon
device, perform hermon_unmap_mpt() which runs HERMON_HCR_HW2SW_MPT to
bring the Memory Protection Table (MPT) back to software control.
Signed-off-by: Christian Iversen <ci@iversenit.dk> Modified-by: Michael Brown <mcb30@ipxe.org> Signed-off-by: Michael Brown <mcb30@ipxe.org>
The eIPoIB local Ethernet MAC is currently constructed from the port
GUID. Given a base GUID/MAC value of N, Mellanox seems to populate:
Node GUID: N + 0
Port 1 GUID: N + 1
Port 2 GUID: N + 2
and
Port 1 MAC: N + 0
Port 2 MAC: N + 1
This causes a duplicate local MAC address when port 1 is configured as
Infiniband and port 2 as Ethernet, since both will derive their MAC
address as (N + 1).
Fix by using the port's Ethernet MAC as the eIPoIB local EMAC. This
is a behavioural change that could potentially break configurations
that rely on the local EMAC value, such as a DHCP server relying on
the chaddr field for DHCP reservations.
Signed-off-by: Christian Iversen <ci@iversenit.dk> Modified-by: Michael Brown <mcb30@ipxe.org> Signed-off-by: Michael Brown <mcb30@ipxe.org>
[hermon] Increase polling rate for command completions
Some older versions of the hardware (and/or firmware) do not report an
event when an Infiniband link reaches the INIT state. The driver
works around this missing event by calling ib_smc_update() on each
event queue poll while the link is in the DOWN state. This results in
a very large number of commands being issued while any open Infiniband
link is in the DOWN state (e.g. unplugged), to the point that the 1ms
delay from waiting for each command to complete will noticeably affect
responsiveness.
Fix by decreasing the command completion polling delay from 1ms to
10us.
Signed-off-by: Christian Iversen <ci@iversenit.dk> Modified-by: Michael Brown <mcb30@ipxe.org> Signed-off-by: Michael Brown <mcb30@ipxe.org>
[hermon] Increase command timeout from 2 to 10 seconds
Some commands (particularly in relation to device initialization) can
occasionally take longer than 2 seconds, and the Mellanox documentation
recommends a 10 second timeout.
Signed-off-by: Christian Iversen <ci@iversenit.dk>
Michael Brown [Tue, 26 Jan 2021 20:46:57 +0000 (20:46 +0000)]
[efi] Use EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL if available
The original EFI_SIMPLE_TEXT_INPUT_PROTOCOL is not technically
required to handle the use of the Ctrl key, and the long-obsolete EFI
1.10 specification lists only backspace, tab, linefeed, and carriage
return as required. Some particularly brain-dead vendor UEFI firmware
implementations dutifully put in the extra effort of ensuring that all
other control characters (such as Ctrl-C) are impossible to type via
EFI_SIMPLE_TEXT_INPUT_PROTOCOL.
Current versions of the UEFI specification mandate that the console
input handle must support both EFI_SIMPLE_TEXT_INPUT_PROTOCOL and
EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL, the latter of which at least
provides access to modifier key state.
Unlike EFI_SIMPLE_TEXT_INPUT_PROTOCOL, the pointer to the
EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL instance does not appear within the
EFI system table and must therefore be opened explicitly. The UEFI
specification provides no safe way to do so, since we cannot open the
handle BY_DRIVER or BY_CHILD_CONTROLLER and so nothing guarantees that
this pointer will remain valid for the lifetime of iPXE. We must
simply hope that no UEFI firmware implementation ever discovers a
motivation for reinstalling the EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL
instance.
Use EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL if available, falling back to
the existing EFI_SIMPLE_TEXT_PROTOCOL otherwise.
Joe Groocock [Thu, 19 Dec 2019 13:08:50 +0000 (13:08 +0000)]
[image] Implicitly trust first embedded image
iPXE when used as a NIC option ROM can sometimes be reloaded by the
UEFI/BIOS and any pre-initialised memory will remain loaded. When the
imgtrust command is run it sets `require_trusted_images'. Upon
reloading, iPXE tries to load the first embedded image but fails as it
is not marked trusted.
Setting this flag ensures that imgtrust with the first embedded script
is reentrant.
Signed-off-by: Joe Groocock <jgroocock@cloudflare.com>
[infiniband] Require drivers to specify the number of ports
Require drivers to report the total number of Infiniband ports. This
is necessary to report the correct number of ports on devices with
dynamic port types.
For example, dual-port Mellanox cards configured for (eth, ib) would
be rejected by the subnet manager, because they report using "port 2,
out of 1".
Signed-off-by: Christian Iversen <ci@iversenit.dk>
Michael Brown [Mon, 25 Jan 2021 16:34:22 +0000 (16:34 +0000)]
[efi] Automatically load "/autoexec.ipxe" when booted from a filesystem
When booting iPXE from a filesystem (e.g. a FAT-formatted USB key) it
can be useful to have an iPXE script loaded automatically from the
same filesystem. Compared to using an embedded script, this has the
advantage that the script can be edited without recompiling the iPXE
binary.
For the BIOS version of iPXE, loading from a filesystem is handled
using syslinux (or isolinux) which allows the script to be passed to
the iPXE .lkrn image as an initrd.
For the UEFI version of iPXE, the platform firmware loads the iPXE
.efi image directly and there is currently no equivalent of the BIOS
initrd mechanism.
Add support for automatically loading a file "autoexec.ipxe" (if
present) from the root of the filesystem containing the UEFI iPXE
binary.
A combined BIOS and UEFI image for a USB key can be created using e.g.
Michael Brown [Sun, 24 Jan 2021 12:15:20 +0000 (12:15 +0000)]
[build] Check that mkisofs equivalent supports the required options
The "-e" option required for creating EFI boot images is supported
only by widely used patched versions of genisoimage.
Check that the required options are supported when selecting a mkisofs
equivalent, thereby allowing a fallback to the use of xorrisofs when
building a UEFI ISO image on a system with an unpatched version of
genisoimage.
Continue to prefer the use of genisoimage over xorrisofs, since there
is apparently no way to inhibit the irritatingly useless startup
banner message printed by xorrisofs even when the "-quiet" option is
specified.
Michael Brown [Fri, 22 Jan 2021 21:05:07 +0000 (21:05 +0000)]
[tftp] Allow for profiling of client and server turnaround times
Provide some visibility into the turnaround times on both client and
server sides as perceived by iPXE, to assist in debugging inexplicably
slow TFTP transfers.
Michael Brown [Fri, 22 Jan 2021 12:22:11 +0000 (12:22 +0000)]
[build] Use explicit disk geometry for generated FAT filesystem images
For FAT filesystem images larger than a 1.44MB floppy disk, round up
the image size to a whole number of 504kB cylinders before formatting.
This avoids losing up to a cylinder's worth of expected space in the
filesystem image.
Michael Brown [Thu, 21 Jan 2021 21:23:06 +0000 (21:23 +0000)]
[build] Set volume name "iPXE" on FAT filesystem images
Allow generated filesystem images to be accessed using the file:// URI
syntax by setting a defined volume name. This allows a script placed
on the same filesystem image to be accessed using e.g.
Michael Brown [Tue, 19 Jan 2021 12:54:50 +0000 (12:54 +0000)]
[dhcp] Allow for links that remained blocked for up to three minutes
With the default timeouts for Cisco MAC Authentication Bypass, the
link will remain blocked for around 90 seconds (plus a likely
subsequent delay for STP).
Extend the maximum number of DHCP discovery deferrals to allow for up
to three minutes of waiting for a link to become unblocked.
Michael Brown [Tue, 19 Jan 2021 12:37:50 +0000 (12:37 +0000)]
[eap] Treat an EAP Request-Identity as indicating a blocked link
A switch port using 802.1x authentication will send EAP
Request-Identity packets once the physical link is up, and will not be
forwarding packets until the port identity has been established.
We do not currently support 802.1x authentication. However, a
reasonably common configuration involves using a preset list of
permitted MAC addresses, with the "authentication" taking place
between the switch and a RADIUS server. In this configuration, the
end device does not need to perform any authentication step, but does
need to be prepared for the switch port to fail to forward packets for
a substantial time after physical link-up. This exactly matches the
"blocked link" semantics already used when detecting a non-forwarding
switch port via LACP or STP.
Treat a received EAP Request-Identity as indicating a blocked link.
Unlike LACP or STP, there is no way to determine the expected time
until the next EAP packet and so we must choose a fixed timeout.
Erroneously assuming that the link is blocked is relatively harmless
since we will still attempt to transmit and receive data even over a
link that is marked as blocked, and so the net effect is merely to
prolong DHCP attempts. In contrast, erroneously assuming that the
link is unblocked will potentially cause DHCP to time out and give up,
resulting in a failed boot.
The default EAP Request-Identity interval in Cisco switches (where
this is most likely to be encountered in practice) is 30 seconds, so
choose 45 seconds as a timeout that is likely to avoid gaps during
which we falsely assume that the link is unblocked.
Michael Brown [Tue, 19 Jan 2021 12:21:28 +0000 (12:21 +0000)]
[dhcp] Continue transmitting DHCPDISCOVER while link is blocked
Continue to transmit DHCPDISCOVER while waiting for a blocked link, in
order to support mechanisms such as Cisco MAC Authentication Bypass
that require repeated transmission attempts in order to trigger the
action that will result in the link becoming unblocked.
Michael Brown [Fri, 15 Jan 2021 20:54:27 +0000 (20:54 +0000)]
[build] Inhibit spurious array bounds warning on some versions of gcc
Some versions of gcc (observed with gcc 9.3.0 on NixOS Linux) produce
a spurious warning about an out-of-bounds array access for the
isa_extra_probe_addrs[] array.
Work around this compiler bug by redefining the array index as a
signed long, which seems to somehow avoid this spurious warning.
Debugged-by: Manuel Mendez <mmendez534@gmail.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown [Wed, 13 Jan 2021 11:50:26 +0000 (11:50 +0000)]
[build] Create util/genfsimg for building filesystem-based images
Generalise util/geniso, util/gensdsk, and util/genefidsk to create a
single script util/genfsimg that can be used to build either FAT
filesystem images or ISO images.
Extend the functionality to allow for building multi-architecture UEFI
bootable ISO images and combined BIOS+UEFI images.
Michael Brown [Sun, 3 Jan 2021 19:12:41 +0000 (19:12 +0000)]
[efi] Leave asynchronous USB endpoints open until device is removed
Some UEFI device drivers will react to an asynchronous USB transfer
failure by dubiously terminating the scheduled transfer from within
the completion handler.
We already have code from commit fbb776f ("[efi] Leave USB endpoint
descriptors in existence until device is removed") that avoids freeing
memory in this situation, in order to avoid use-after-free bugs. This
is not sufficient to avoid potential problems, since with an xHCI
controller the act of closing the endpoint requires issuing a command
and awaiting completion via the event ring, which may in turn dispatch
further USB transfer completion events.
Avoid these problems by leaving the USB endpoint open (but with the
refill timer stopped) until the device is finally removed, as is
already done for control and bulk transfers.
Michael Brown [Sun, 3 Jan 2021 19:08:49 +0000 (19:08 +0000)]
[xhci] Fail attempts to issue concurrent commands
The xHCI driver can handle only a single command TRB in progress at
any one time. Immediately fail any attempts to issue concurrent
commands (which should not occur in normal operation).
Michael Brown [Thu, 31 Dec 2020 20:41:49 +0000 (20:41 +0000)]
[efi] Use segment and bus number to identify PCI root bridge I/O protocol
There may be multiple instances of EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL for
a single PCI segment. Use the bus number range descriptor from the
ACPI resource list to identify the correct protocol instance.
There is some discrepancy between the ACPI and UEFI specifications
regarding the interpretation of values within the ACPI resource list.
The ACPI specification defines the min/max field values to be within
the secondary (device-side) address space, and defines the offset
field value as "the offset that must be added to the address on the
secondary side to obtain the address on the primary side".
The UEFI specification states instead that the offset field value is
the "offset to apply to the starting address to convert it to a PCI
address", helpfully omitting to clarify whether "to apply" in this
context means "to add" or "to subtract". The implication of the
wording is also that the "starting address" is not already a "PCI
address" and must therefore be a host-side address rather than the
ACPI-defined device-side address.
Code comments in the EDK2 codebase seem to support the latter
(non-ACPI) interpretation of these ACPI structures. For example, in
the PciHostBridgeDxe driver there can be found the comment
Macros to translate device address to host address and vice versa.
According to UEFI 2.7, device address = host address + translation
offset.
along with a pair of macros TO_HOST_ADDRESS() and TO_DEVICE_ADDRESS()
which similarly negate the sense of the "translation offset" from the
definition found in the ACPI specification.
The existing logic in efipci_ioremap() (based on a presumed-working
externally contributed patch) applies the non-ACPI interpretation: it
assumes that min/max field values are host-side addresses and that the
offset field value is negated.
Match this existing logic by assuming that min/max field values are
host-side bus numbers. (The bus number offset value is therefore not
required and so can be ignored.)
As noted in commit 9b25f6e ("[efi] Fall back to assuming identity
mapping of MMIO address space"), some systems seem to fail to provide
MMIO address space descriptors. Assume that some systems may
similarly fail to provide bus number range descriptors, and fall back
in this situation to assuming that matching on segment number alone is
sufficient.
Testing any of this is unfortunately impossible without access to
esoteric hardware that actually uses non-zero translation offsets.
Originally-implemented-by: Thomas Walker <twalker@twosigma.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Martin Habets [Mon, 23 Nov 2020 08:07:13 +0000 (08:07 +0000)]
[sfc] Update email addresses
Email from solarflare.com will stop working, so update those. Remove
email for Shradha Shah, as she is not involved with this any more.
Update copyright notices for files touched.
[x509] Clarify debug message for an untrusted X.509 issuer
We surface this debugging information in cases where a cert actually
lacks an issuer, but also in cases where it *has* an issuer, but we
cannot trust it (e.g. due to issues in establishing a trust chain).
Signed-off-by: Josh McSavaney <me@mcsau.cc> Modified-by: Michael Brown <mcb30@ipxe.org> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown [Thu, 17 Dec 2020 20:37:27 +0000 (20:37 +0000)]
[efi] Skip interface uninstallation during shutdown
iPXE seems to be almost alone in the UEFI world in attempting to shut
down cleanly, free resources, and leave hardware in a well-defined
reset state before handing over to the booted operating system.
The UEFI driver model does allow for graceful shutdown via
uninstallation of protocol interfaces. However, virtually no other
UEFI drivers do this, and the external code paths that react to
uninstallation are consequently poorly tested. This leads to a
proliferation of bugs found in UEFI implementations in the wild, as
described in commits such as 1295b4a ("[efi] Allow initialisation via
SNP interface even while claimed") or b6e2ea0 ("[efi] Veto the HP
XhciDxe Driver").
Try to avoid triggering such bugs by unconditionally skipping the
protocol interface uninstallation during UEFI boot services shutdown,
leaving the interfaces present but nullified and deliberately leaking
the containing memory.
Michael Brown [Wed, 16 Dec 2020 13:29:06 +0000 (13:29 +0000)]
[iphone] Add iPhone tethering driver
USB tethering via an iPhone is unreasonably complicated due to the
requirement to perform a pairing operation that involves establishing
a TLS session over a completely unrelated USB function that speaks a
protocol that is almost, but not quite, entirely unlike TCP.
Michael Brown [Tue, 8 Dec 2020 14:58:46 +0000 (14:58 +0000)]
[x509] Record root of trust used when validating a certificate
Record the root of trust used at the point that a certificate is
validated, redefine validation as checking a certificate against a
specific root of trust, and pass an explicit root of trust when
creating a TLS connection.
This allows a custom TLS connection to be used with a custom root of
trust, without causing any validated certificates to be treated as
valid for normal purposes.
Michael Brown [Tue, 8 Dec 2020 14:39:33 +0000 (14:39 +0000)]
[ocsp] Remove dummy OCSP certificate root
OCSP currently calls x509_validate() with an empty root certificate
list, on the basis that the OCSP signer certificate (if existent) must
be signed directly by the issuer certificate.
Using an empty root certificate list is not required to achieve this
goal, since x509_validate() already accepts an explicit issuer
certificate parameter. The explicit empty root certificate list
merely prevents the signer certificate from being evaluated as a
potential trusted root certificate.
Remove the dummy OCSP root certificate list and use the default root
certificate list when calling x509_validate().
Michael Brown [Mon, 7 Dec 2020 13:51:46 +0000 (13:51 +0000)]
[tls] Use intf_insert() to add TLS to an interface
Restructure the use of add_tls() to insert a TLS filter onto an
existing interface. This allows for the possibility of using
add_tls() to start TLS on an existing connection (as used in several
protocols which will negotiate the choice to use TLS before the
ClientHello is sent).
Michael Brown [Mon, 7 Dec 2020 13:49:47 +0000 (13:49 +0000)]
[interface] Provide intf_insert() to insert a filter interface
Generalise the filter interface insertion logic from block_translate()
and expose as intf_insert(), allowing a filter interface to be
inserted on any existing interface.
Michael Brown [Mon, 30 Nov 2020 17:48:52 +0000 (17:48 +0000)]
[efi] Veto the HP XhciDxe Driver
The HP XhciDxe driver (observed on an HP EliteBook 840 G6) does not
respond correctly to driver disconnection, and will leave the PciIo
protocol instance opened with BY_DRIVER attributes even after
returning successfully from its Stop() method. This prevents iPXE
from subsequently connecting to the PCI device handle.
Veto this driver if the iPXE build includes a native xHCI driver.
Michael Brown [Mon, 30 Nov 2020 17:08:58 +0000 (17:08 +0000)]
[efi] Allow vetoing of drivers that cannot be unloaded
Some UEFI drivers (observed with the "Usb Xhci Driver" on an HP
EliteBook) are particularly badly behaved: they cannot be unloaded and
will leave handles opened with BY_DRIVER attributes even after
disconnecting the driver, thereby preventing a replacement iPXE driver
from opening the handle.
Allow such drivers to be vetoed by falling back to a brute-force
mechanism that will disconnect the driver from all handles, uninstall
the driver binding protocol (to prevent it from attaching to any new
handles), and finally close any stray handles that the vetoed driver
has left open.
projects / thirdparty / ipxe.git / log
