Pali Rohár [Sun, 2 Jan 2022 19:50:41 +0000 (20:50 +0100)]
libpci: mmio-ports: Add Extended PCIe Intel Type 1 access method
Extended method allows to access all PCIe registers, including extended
registers starting at 0x100 offset. This method uses 4 reserved buts above
bus bits for PCIe registers. On ARM platforms it is very common for PCIe
controllers. Like standard method, it needs to be properly configured.
Pali Rohár [Fri, 4 Mar 2022 00:07:53 +0000 (01:07 +0100)]
libpci: Add new windows kldbgdrv.sys implementation
Microsoft Kernel Local Debugging Driver (kldbgdrv.sys) allow access for
userspace processes to the PCI config space. It supports access up to
65536 domains and whole 4096 bytes long extended PCIe config space. Driver
is signed by Microsoft and is available for both 32-bit and 64-bit systems.
Driver is not part of Windows system and has to be installed via WinDbg
installation package. Standalone installers for WinDbg 6.12.2.633 version:
https://download.microsoft.com/download/A/6/A/A6AC035D-DA3F-4F0C-ADA4-37C8E5D34E3D/setup/WinSDKDebuggingTools_amd64/dbg_amd64.msi
https://download.microsoft.com/download/A/6/A/A6AC035D-DA3F-4F0C-ADA4-37C8E5D34E3D/setup/WinSDKDebuggingTools/dbg_x86.msi
This kldbgdrv.sys API is used by the !pci command of new WinDbg kernel
debugger for displaying PCI config space.
API of this driver is available only for processes with Debug privilege and
only if system was booted with Debugging option.
Pali Rohár [Sun, 6 Nov 2022 17:57:39 +0000 (18:57 +0100)]
i386-ports: Fix intel_io_lock usage
Do not call pci_generic_block_read() and pci_generic_block_write()
functions when io is locked. These functions call back same backend
read/write function which tries to lock and unlock io again.
Pali Rohár [Sun, 6 Nov 2022 12:58:55 +0000 (13:58 +0100)]
i386-io-linux: Prefer usage of ioperm()
Since Linux 2.6.8, it is possible to use ioperm() syscall to gain access
for all I/O ports. Because iopl() syscall before Linux 5.5 allowed
userspace to disable interrupts, prefer usage of ioperm() syscall and ask
for access only for PCI ports.
Pali Rohár [Sun, 2 Jan 2022 19:50:41 +0000 (20:50 +0100)]
libpci: Add Intel Type 1 implementation for memory mapped systems
Lot of non-x86 platforms also support Intel Type 1 mechanism. x86 IO ports
CF8 and CFC are on these platforms mapped into standard memory space.
Address mapping itself is platform or board specific and there is no
default value.
Lot of ARM boards with multiple PCIe controllers are multi-domain and each
PCI domain has its own CF8/CFC (address/data) registers mapped into memory
space.
Add new mmio-conf1 backend which access CF8/CFC ports via MMIO and define
new config option mmio-conf1.addrs which specify list of address/data
register pairs in memory space for each PCI domain. Format of this option
is: 0xaddr1/0xdata1,0xaddr2/0xdata2,...
Jaxon Haws [Mon, 31 Oct 2022 21:57:43 +0000 (16:57 -0500)]
cxl: Fix Register Locator DVSEC decoding
Fix decoding of register blocks by introducing offset to position
calculation (8.1.9 of CXL 3.0 spec) and removed unused defines for
Register Locator DVSEC.
Show error message from intel_setup_io() function into debug area instead
of error area. This is what other backends do as intel_setup_io() is called
during quite detect phase, which may fail.
Also show human readable failure instead of magic code number.
Pali Rohár [Sun, 8 May 2022 12:31:11 +0000 (14:31 +0200)]
libpci: Put name and version information into DLL library
Generate rc file from in template and fill DLL name and DLL version from
Makefile.
It looks like that the only possible way via GNU tools to specify version
information for DLL library is via text rc file compiled as COFF object
file via GNU windres and linked into the final DLL library via GNU ld.
Pali Rohár [Sun, 8 May 2022 08:52:35 +0000 (10:52 +0200)]
libpci: Do not call unversioned symbols from libpci itself
Windows version of GNU LD has bugs which cause that linker would translate
this unknown unversioned symbols to some random version.
So change pci_fill_info() to pci_fill_info_v38() in lib/filter.c to ensure
that last version of this function would be used also by Windows version of
GNU LD linker.
Before this change GNU LD translated this function call to symbol
_pci_fill_info@LIBPCI_3.0. After this change GNU LD translate it to
_pci_fill_info@LIBPCI_3.8.
Pali Rohár [Sun, 8 May 2022 08:25:59 +0000 (10:25 +0200)]
libpci: Add support for building versioned shared Windows DLL library libpci3.dll
PE/COFF format, used by DLL libraries, does not support version symbols
like ELF format. Recommendation from Microsoft for DLL symbol versioning is
to use DLL API sets. But DLL API sets scheme requires for every API change
to generated a new slim forwarding DLL library, which is unsuitable for
distribution which wants just one DLL library with all version symbols.
So instead of Microsoft recommended scheme for DLL versioning, use new
different versioning scheme: Symbol is composed by function name, at (@)
character and version string (version is same as for ELF targets). Symbol
name without version information is added only into the DLL DEF file as
alias to symbol with higest version. So linker at application link time
resolves "unversioned" symbol to the versioned one via this alias and puts
"versioned" symbol into final executable. This works fine if GNU LD is
linking application via import library libpci3.dll.a generated from that
DLL DEF file libpci3.def. But does not work when linking directly to the
DLL library because library itself does not contain aliases. Note that GNU
LD does not support linking to DEF file (it is required to first generated
import library from DEF file).
Note that older GNU LD versions have bug which cause generation of
corrupted DLL files if some symbol contains dot (.) character. Hopefully
this bug was fixed in GNU LD 2.21.
At the end application lspci.exe requires library libpci3.dll with symbols
pci_alloc@LIBPCI_3.0, pci_init@LIBPCI_3.5, pci_fill_info@LIBPCI_3.8 and
therefore libpci3.dll stays backward compatible with future changes.
PE/COFF executables can reference symbols either via name or via its
ordinal number. Because DLL DEF files are generated from libpci version
script and generator ver2def.pl preserves order of symbols, it means that
ordinal numbers stay backward compatible unless order of lines in version
script is changed.
WARNINGS:
GCC an GNU LD for Windows target have some bugs which cause that
-fvisibility=hidden switch and __attribute__((visibility("default"))) does
not work. Seems that they are broken and ignored when building DLL library.
So instead use -Wl,--exclude-all-symbols switch with explicit DLL DEF file
for building DLL library, which seems to work. This switch is supported
since GNU LD 2.21.
GNU LD has also another bug which results in broken DLL library if input
DLL DEF file which describes symbols for exports, contains also symbol
aliases via == operator.
So do not specify symbol aliases in input DLL DEF file for building DLL
library. Instead construct separate DLL DEF file for building libpci3.dll
without symbol aliases and separate DLL DEF file libpci3.def with symbol
aliases for building import library libpci3.dll.a suitable for linking into
target applications. Note that operator == for symbol aliases is supported
since GNU dlltool 2.21.
Generate those two DLL DEF files via new script ver2def.pl from libpci.ver
version script. So exported functions and version symbols would be defined
only at one place in file libpci.ver.
Note that GNU LD for Windows targets has also broken support for version
scripts, it exports nonsense data and completely ignores version
information. So always use only DLL DEF files generated by ver2def.pl
script and never pass original version script to GNU LD.
Due to another bugs in GNU dlltool, ordinals for aliased symbols from DLL
DEF file are calculated incorrectly when building import library. So
calculate ordinals manually in ver2def.pl script and explicitly put then
into generated libpci3.def DLL DEF file for every symbol, including
aliases.
And because aliases are stored only in libpci3.def file (and in import
library libpci3.dll.a generated from that DEF file) and not in DLL library
libpci3.dll itself, it is required to link all libpci applications via
import library and not directly to libpci3.dll. This is limitation of
PE/COFF format used by DLL libraries.
So for building Windows DLL library libpci3.dll is needed to use GNU
binutils 2.21 or new.
Pali Rohár [Thu, 16 Jun 2022 14:14:56 +0000 (16:14 +0200)]
setpci: Check if standard register on device exist
Some standard registers are available only on device with header type 0,
some only on header type 1, some other only on header type 2 and some on
header type 0 and 1. Add definitions which registers are available on which
header type and add check to access only available registers.
libpci: i386-io-windows.h: Do not define __readeflags() for GCC 4.9+
GCC header file <x86intrin.h> defines static inline function __readeflags()
which calls correct __builtin_ia32_readeflags_XX() builtin.
Header file <x86intrin.h> is included by MinGW-w64's <intrin.h> header file
in new versions of MinGW-w64 and <intrin.h> may be included transitionally
by some other header files automatically.
Defining __readeflags() as both macro and static inline function cause
compile errors.
Fix this compile error by not defining __readeflags() macro and instead
include GCC header file <x86intrin.h>.
Pali Rohár [Sun, 2 Jan 2022 19:51:02 +0000 (20:51 +0100)]
libpci: Add new windows NT sysdbg implementation
NT SysDbg interface allow access to the PCI config space. Only devices on
the first domain are available and only first 256 bytes of the PCI config
space can be accessed. Compared to intel-conf1 access, this API is race
free as NT kernel serialize access to PCI I/O ports. This NT SysDbg API is
used by the !pci command of 32-bit WinDbg kernel debugger for displaying
PCI config space. Debug privilege is required to use this NT interface.
Pali Rohár [Thu, 10 Mar 2022 20:38:18 +0000 (21:38 +0100)]
lspci: Fix detection of memory space bar
intel-conf1 backend never show AtomicOpsCap: capabilities despite the fact
that is successfuly detects memory bars on device. But other backends show
this capability.
Error is in device_has_memory_space_bar() function, it expects that ->size
member is always filled. But size of the BAR is not available in PCI config
space and therefore raw backends cannot retrieve it.
Probably intention of the non-zero check was to verify that base address
was filled with non-zero size. So either base address is non-zero or length
is non-zero. Adjust check.
Pali Rohár [Sat, 5 Mar 2022 23:22:03 +0000 (00:22 +0100)]
lspci: Fix detection of virtual regions
There are many issues with detection of virtual regions.
1. Variable for detecting virtual region is global and if one BAR is marked
as virtual then all remaining BARs are treated as virtual too as this
variable is not reset at next loop iteration.
2. Lower address is read from flg variable which on backends without config
space is initialized from PCI flags, not from base address.
3. Code mixes at many places PCI flags, resource flags, PCI addresses and
resource addresses. Some backends reports PCI flags in PCI addresses,
some not.
Cleanup mess of ->base_addr, ->flags and PCI_BASE_ADDRESS. If backend
provides ->flags value (test via PCI_FILL_IO_FLAGS) then use it instead of
reading flags from pci config space.
Fix reading of PCI hw_lower and hw_upper addresses. If PCI_BASE_ADDRESS
reports different type than what is stored in base_addr then completely
ignore hw_lower and hw_upper values. It means that backend either provide
fiction information or provide resources in different order as they are
stored in hardware. In any case values from HW cannot be used as they do
not match values reported by backend.
And in the last case, make virtual variable local to the current BAR
processing and do not increment loop variable i when 64-bit MEM type is
detected via data from config space. It could miss some virtual resource
reported by the backend.
This change fixes displaying resources of PCI devices which have some
unset/unused BARs in the middle and OS reports virtual regions and
remaining regions without holes. E.g. HW BARs 0, 2, 5 are used and OS
reports base_addr 0, 1, 2, 3.
Pali Rohár [Sun, 27 Feb 2022 00:57:38 +0000 (01:57 +0100)]
libpci: Always call pci_set_name_list_path() in pci_init_name_list_path()
If pci_init_name_list_path() does not call pci_set_name_list_path() then
a->id_file_name variable is NULL and pci_load_name_list() would crash as it
tries to do fopen(NULL, ...).
If libpci was configured at compile time to use current executable path for
locating pci.ids file and it is not possible to determinate current
executable path then call pci_set_name_list_path() with just filename
without path (this would fallback to the current working directory).
Pali Rohár [Tue, 28 Dec 2021 19:29:21 +0000 (20:29 +0100)]
lspci: Do not access config space when it is emulated
Emulated config space contains only few information so it could look like
some valid config space. libpci compose emulated config space either from
struct pci_dev or put some fake information (when struct pci_dev does not
have them).
To prevent showing to user fake/bogus information about PCI devices, show
only information which are directly stored in struct pci_dev when emulated
config space is used.
Do it via setting lspci's header type to invalid value (byte)-1, so lspci
code will handle device as unknown without trying to interpret values
config space. This header type is set only in lspci, not in libpci, so
other libpci applications would see valid config space.
lspci users are probably not interested in fake information provided by
libpci just for purpose to export syntactically valid config space.
Information stored in struct pci_dev are the correct one (or rather what OS
things that is correct).
Pali Rohár [Fri, 31 Dec 2021 16:49:00 +0000 (17:49 +0100)]
libpci: Add windows cfgmgr32 implementation
Access via cfgmgr32.dll library allows to list PCI devices and retrieve
their basic properties and system resource configuration. Access is
available to all users and should not require special privileges, access
tokens, rights or permissions.
This cfgmgr32.dll library does not provide access to PCI config space.
Pali Rohár [Sun, 2 Jan 2022 12:33:12 +0000 (13:33 +0100)]
libpci: Implement virtual config space for provides without access to config space
Add a new pci_dev member no_config_access which signals that there is no
access to config space for particular device. Reading operation in this
case should return data from emulated virtual config space. For provides
there is a new helper function pci_generic_read() which emulates config
spaces based on struct pci_dev members.
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