LinuxKPI: add further constants to pci.h

Updated wireless drivers require more knowledge about PCI (BAR) bits.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: jhb
Differential Revision: https://reviews.freebsd.org/D44573

LinuxKPI: Add pci_dev_id to linux/pci.h

It returns bus/device/function number for given PCI device.
Also add intermediate PCI_DEVID macro used in some drivers.

Sponsored by: Serenity Cyber Security, LLC
Reviewed by: emaste
MFC after: 1 week

LinuxKPI: Add pcie_capability_clear_and_set_word() function

It does a Read-Modify-Write operation using clear and set bitmasks on
PCI Express Capability Register at pos. As certain PCI Express
Capability Registers are accessed concurrently in RMW fashion, hence
require locking which is handled transparently to the caller.

Sponsored by: Serenity CyberSecurity, LLC
Reviewed by: manu, bz
MFC after: 1 week
MFC TODO: Move pcie_cap_lock to bottom to preserve KBI compatibility
Differential Revision: https://reviews.freebsd.org/D42821

LinuxKPI: Remove sys/rman.h include from LKPI headers.

sys/rman.h defines `resource` structure which conflicts with the Linux
structure of the same name. To fix that remove reference to sys/rman.h
from linux/pci.h and move resource management code to linux_pci.c.
Update consumers which were depending on linux/pci.h pollution.

No functional changes intended.

Sponsored by: Serenity Cyber Security, LLC
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D42792

sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

LinuxKPI: pci.h add more constants

Add two more PCI_EXP_LNKSTA_CLS constants to the compat defines
needed by wireless drivers.

Sponsored by: The FreeBSD Foundation
MFC after: 10 days
Reviewed by: manu, emaste
Differential Revision: https://reviews.freebsd.org/D41258

LinuxKPI: pci: update struct msi_desc

It seems struct msi_desc is setup differently (or was changed) compared
to how we added it a while ago. Catch up in order to keep drivers
directly accessing fields compiling.

Sponsored by: The FreeBSD Foundation
MFC after: 10 days
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D40175

LinuxKPI: pci: add PCI_COMMAND_MEMORY

Add another PCI alias to our native defines for a wireless driver.

MFC after: 10 days
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D40247

LinuxKPI: implement pci_rescan_bus()

Try to implement pci_rescan_bus(). pci_rescan_method() is already
doing most of the job. We only have to do the count for the return
value again ourselves.

Sponsored by: The FreeBSD Foundation
MFC after: 10 days
Reviewed by: jhb
Differential Revision: https://reviews.freebsd.org/D40122

LinuxKPI: pci.h: always initialize return value

In pcie_capability_read_*() always initialize the return value to
avoid warnings of uninitialized values in callers.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D39721

linuxkpi: Define `pat_enabled()`

This new <asm/memtype.h> header is included from <linux/pci.h> because
that's how it is included in Linux too. DRM drivers depend on this.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D39052

linuxkpi: Define `pcie_aspm_enabled()`

This is not the same as querying the PCIE ASPM capability. The function
should return if the feature is actually enabled or not. It always
return false on FreeBSD.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D39053

LinuxKPI: return an address string in pci_name()

amdgpu's virtual display feature uses pci_name() to match a module parameter
string, and the documentation shows an example of `0000:26:00.0` for the name.
In our case the name was just `drmn`, which is not actually unique across
devices.

The other consumers are wireless drivers, which will benefit from this
change.

Generate the expected string for pci_name() to return.

Related to: https://github.com/freebsd/drm-kmod/issues/134
Sponsored by: https://www.patreon.com/valpackett
Reviewed by: bz, hselasky, manu (earlier)
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D34248

LinuxKPI: PCI: implement support for more than 1 MSI vector

Following e9715b1c4474333ff119aba3a9a74bff91f72372 and
4b56afaf7bf4fa37bae5b26fd93ee1ff5969c1bb, implement support
for up-to 32 MSI vectors. This is used by wireless drivers.
This also switches msi_desc to an array in order to store
per-vector information.

Sponsored by: The FreeBSD Foundation
Discussed with: grehan (in Dec)
MFC after: 3 days
Reviewed by: jhb
Differential Revision: https://reviews.freebsd.org/D38222

LinuxKPI: pci: add more functions

Add a dummy pci_assign_resource() and an implementation of
pci_irq_vector() returning the irq for MSI-X, MSI, and legacy interrupt.
Both are needed by wirless drivers.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: jhb
Differential Revision: https://reviews.freebsd.org/D38237

LinuxKPI: pci.h move function declaration to top of file.

No functional changes.

X-MFC-with: 49b6d5ed142d6c59b7a517ff5660165d8647bd01
Sponsored by: The FreeBSD Foundation

linuxkpi: Define `PCI_STD_NUM_BARS` in <linux/pci.h>

Reviewed by: emaste, manu
Approved by: emaste, manu
Differential Revision: https://reviews.freebsd.org/D38162

linuxkpi: Add `msix_cap` to `struct pci_dev`

At the same time, define `PCI_MSIX_FLAGS`and `PCI_MSIX_FLAGS_ENABLE`.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38160

linuxkpi: Add `pci_device_is_present()`

This calls bus_child_present(9) internally.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38148

LinuxKPI: implement irq_get_msi_desc()

Add irq_get_msi_desc() as a wrapper around a PCI function which will
allocate a single cached value (see comment on struct) for the
msi_desc requested if it doesn't exist yet and handle freeing it
when the PCI device goes away. We take the values from the ivars of
the native (FreeBSD) device.

While changing struct pci_dev also add the msi_cap field requested by
a wireless driver.

Bump __FreeBSD_version so these changes can be detected.

MFC after: 3 days
X-MFC: move fields to end of struct (alloc happens in linux_pci.c)
Reviewed by: hselasky (earlier version)
Differential Revision: https://reviews.freebsd.org/D37523

LinuxKPI: pci: add [linuxkpi_]pci_get_device()

Add a version of pci_get_device() as linuxkpi_pci_get_device()
not (yet) supporting the last argument.
Due to conflicts we cannot redefine it as we would normally do
in LinuxKPI so drivers have to be adjusted.

MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D37593

linuxkpi: Add `PCIE_SPEED_{32,64}_0GT` PCI-E bus speed constants

This change is a requirement to update our DRM drivers to Linux 5.12.

Differential Revision: https://reviews.freebsd.org/D37363

LinuxKPI: pci.h add more MSI related constanst and pci_is_enabled()

Add more MSI related constansts defined to our native defines and
pci_is_enabled(). All are needed for another wireless driver.

MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D37225

linuxkpi: Define `pci_reset_function()` in <linux/pci.h>

Currently, it always returns an error on FreeBSD.

Reviewed by: bz manu
Approved by: bz manu
Differential Revision: https://reviews.freebsd.org/D37366

LinuxKPI: Add pci_power querying for drm-kmod

Adds a few struct members and a function to get i915_runtime_pm_status()
to compile in drm-kmod.

Differential Revision: https://reviews.freebsd.org/D36749
Sponsored by: Google, Inc. (GSoC 2022)

LinuxKPI: pci.h split up pcim_iomap_regions_request_all()

Factor out parts of pcim_iomap_regions_request_all() into
pcim_iomap_regions() now needed for a driver.

Sponsored by: The FreeBSD Foundation
MFC after: 7 days
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D36654

LinuxKPI: pci.h add more defines and functions

Add #defines for PCI_DEVICE_ID and repoint the PCI_VENDOR_ID one.
Add dev_is_pci().
Add pcie_capability_clear_word() according to similar implementations.

Sponsored by: The FreeBSD Foundation
MFC after: 7 days
Reviewed by: hselasky, emaste
Differential Revision: https://reviews.freebsd.org/D36653

linuxkpi: pci: Add more functions needed by drm

Mostly stubs to satisfy building

Reviewed by: hselasky
Obtained from: drm-kmod
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D35938

LinuxKPI: move pm_message_t from kernel.h to pm.h

Move pm_message_t from kernel.h to pm.h and remove a private define
in usb.h as well as adjust the implementation in linux_usb.c.
This cleans up what I believe to be a historic shortcut and is
needed for future wireless driver updates.

Leave a note in UPDATING that drm-kmod users need to update to the
latest version before re-compiling a new kernel to avoid errors
(see PR).

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
PR: 264449 (drm-kmod port update, thanks wulf)
Obtained from: bz_git_iwlwifi (Dec 2020) (partly)
Reviewed by: hselasky, imp
Differential Revision: https://reviews.freebsd.org/D35276

LinuxKPI: implement pcie_capability_set_word()

Implement pcie_capability_set_word() using the already available
read/write functions.
Also define the completion timeout disable value to our PCI one.
Both needed by a driver update.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: manu, hselasky
Differential Revision: https://reviews.freebsd.org/D35250

linuxkpi: Remove unused devclass arguments to DRIVER_MODULE.

linuxkpi: Move lkpi_pcim_iomap_devres_find to .c file

lkpi_pcim_iomap_devres_find encodes the size of struct pcim_iomap_devres
in the code, so move from .h to .c to move from client driver to
linuxkpi module.

Sponsored by: Netflix
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D34775

linuxkpi: Move pci_alloc_irq_vectors to .c file

pci_alloc_irq_vectors encodes the size of struct msix_entry
into its code. Move from .h to .c to move this knowledge from
client modules to linuxkpi module.

Sponsored by: Netflix
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D34774

linuxkpi: Move pci_request_region and _lkpi_pci_iomap into .c

Both pci_request_region and _lkpi_pci_iomap encode the size of struct
pci_mmio_region into their code. Move from .h to .c files to move that
knowledge from the client drivers into the linuxkpi module.

Sponsored by: Netflix
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D34773

linuxkpi: Move lkpi_pci_devres_get_alloc into .c file

lkpi_pci_devres_get_alloc encodes the struct pci_devres into its
code. Move from .h file to .c file to move this knowledge into linuxkpi
module.

Sponsored by: Netflix
Reviewed by: hselasky, emaste
Differential Revision: https://reviews.freebsd.org/D34772

LinuxKPI: pci: implement pci_upstream_bridge()

Allow drivers to query the "upstream PCI bridge".
Currently we point back to ourselves on pdev->bus->self rather than
to the parent PCI bridge.
We keep this as status-quo with an extra comment and only on-demand
allocate a pci_dev for the parent bridge if we are asked for in
pci_upstream_bridge().
When releasing the pci_dev we check if pdev->bus->self has changed
and call pci_dev_put() to release the reference count on the parent
bridge as well.

This code moves pci_is_root_bus() higher up in pci.h but no functional
change there.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: hselasky, (jhb some earlier)
Thanks to: wulf for handling drm-kmod
Differential Revision: https://reviews.freebsd.org/D34305

LinuxKPI: pci.h MODULE_DEVICE_TABLE to MODULE_PNP_INFO

Implement MODULE_PNP_INFO() support in LinuxKPI for the Linux
MODULE_DEVICE_TABLE.

This will allow us to auto-load LinuxKPI PCI drivers (drm-kmod do
not currently as they attach to vgapci0 which in turn grabs the PCI
to my understanding) and make any loading from loader or kld_list in
rc.conf unnecessary; see devmatch(8) for more information.

We need to ensure there is a DRIVER_MODULE() (or probably just
a DECLARE_MODULE but that makes not much difference) before the
MODULE_PNP_INFO (which we otherwise would not need).

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: imp, hselasky, manu
Differential Revision: https://reviews.freebsd.org/D26651

LinuxKPI: remove duplicate include

Remove a duplicate bus.h include from pci.h.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days

LinuxKPI: allow a driver to override the default pci probe result

Add bsd_probe_return which a driver can set in their 'struct pci_driver'
definition to set a driver-sepcific LinuxKPI pci return value.
This is helpful in case of multiple drivers with overlapping IDs,
such as iwlwifi(4) and iwm(4).

Contrary to an earlier version we now assume 0 is not BUS_PROBE_SPECIFIC
(which no driver should really return these days) but the bss initialized
value (bsd_probe_return unset) and we will return BUS_PROBE_DEFAULT.

Suggested by: jhb
Reviewed by: jhb
Reviewed by: hselasky, imp (earlier versions)
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
X-MFC: new struct members need to go to the end for stable/13
Differential Revision: https://reviews.freebsd.org/D33915

LinuxKPI: pci.h add more defines

Add and sort in more defines needed by newer drivers.

MFC after: 3 days
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D34293

LinuxKPI: Constantly use _LINUXKPI_ prefix in include guards

MFC after: 1 week
Reviewed by: bz, emaste, hselasky, manu
Differential Revision: https://reviews.freebsd.org/D33562

LinuxKPI: pci.h / linux_pci.c rename pci_driver field

Rename the struct pci_driver {} field got the list_head from links
to node as a driver is actually initialsing this to {} which seems
questionable but it will at least make us match the Linux structure
field name.

MFC after: 3 days
Reviewed by: manu, hselasky
Differential Revision: https://reviews.freebsd.org/D32645

LinuxKPI: pci.h make pci_dev argument const for pci_{read,write}_config*()

Make the struct pci_dev argument to the pci_{read,write}_config*()
functions "const" to match the Linux definition as some drivers
try to pass in a const argument which we currently fail to honor.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D32644

LinuxKPI: Support lazy BAR allocation

Linux KPIs like pci_resource_start/len assume that BARs have been
allocated, but FreeBSD lazily allocates BARs if it cannot allocate the
firmware-allocated BARs. Thus using the Linux KPIs must force allocation
of the BARs rather than returning 0 for the start and length, which can
crash drm-kmod drivers that assume the BARs are valid. This is needed
for the AMDGPU driver to be able to attach on SiFive's HiFive Unmatched.

Reviewed by: hselasky, jhb, mav
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D32447

LinuxKPI: add module_pci_driver() and pci_alloc_irq_vectors()

Add the two new functions needed by rtw88 to register the driver and
handle the module bits as well as a version of pci_alloc_irq_vectors()
for what is needed.

Reviewed by: hselasky
MFC after: 10 days
Differential Revision: https://reviews.freebsd.org/D30981

LinuxKPI: Add #defines required by drm-kmod v5.5

Reviewed by: hselasky, manu
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D30767

LinuxKPI: pci re-add pci_free_irq_vectors()

Re-add pci_free_irq_vectors() accidentally removed in
d4a4960c6559caa890af0901a21296e75b961210 and now needed by drm-kmod v5.5.

Reported by: wulf
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
X-MFC with: d4a4960c6559caa890af0901a21296e75b961210

LinuxKPI: pci: cleanup some code and add support for "pcim" (managed)

Restructure some code and add support for various "managed" versions
for PCI resource management.
This is beyond of what iwlwifi needs but some was found with other
wireless drivers and it mostly all goes together.
Add one FreeBSD sepcific feature returning the resource rather than
the handle to allow us to use bus_*() functions in drivers directly.

Sponsored by: The FreeBSD Foundation
MFC after: 10 days
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D30558

LinuxKPI: extend pci.h by various functions for wireless driver

Add dummy functions for dealing with "HotPlug" events which we currently
do not support.

Add pci_dev_get(), pci_find_ext_capability() and pci_pme_capable().

The added pcie_find_root_port() is a bit special as we need to create
another linux pci device; for that make lkpinew_pci_dev() public
which is also helpful for other cases when we want to use the Linux
routines to check for device identifiers only and need a container
for the "bsddev" to use natively. This has proven to avoid basic
checking code for the sake of rewriting it to native field names
elsewhere. Given we cache the newly created "root" we also need to
make sure we clean it up.

Sponsored by: The FreeBSD Foundation
MFC after: 10 days
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D30521

linuxkpi: Add rom and romlen to struct pci_dev

Approved by: bz (src), hselasky (src)
Differential Reivison: https://reviews.freebsd.org/D30686

LinuxKPI: add more #defines to pci.h

Add more definitions for various PCI uses to linux/pci.h. Almost all
are defined to their FreeBSD counterparts which are described there.

Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D30434

linuxkpi: Fix pcie_set_readrq()

We were passing a LinuxKPI struct device * to a pci(4) function that
expects a device_t.

Reviewed by: manu, hselasky, bz
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D29675

LinuxKPI: add pci_ids.h

brcm80211 include pci_ids.h directly while historically we were tracking
IDs in pci.h. Move the current set of IDs from pci.h to pci_ids.h and
while here add IDs for Realtek and Broadcom as well as a network class
as needed by their wireless drivers.

We still include pci_ids.h from pci.h so this should not change anything.

MFC-after: 2 weeks
Reviewed-by: hselasky
Differential Revision: https://reviews.freebsd.org/D29400

LinuxKPI: enhance PCI bits for DRM

In pci_domain_nr() directly return the domain which got set in
lkpifill_pci_dev() in all cases. This was missed between D27550
and 105a37cac76b971f7a94409fbdc4f508a7e97fa0 .

In order to implement pci_dev_put() harmonize further code
(which was started in the aforementioned commit) and add kobj
related bits (through the now common lkpifill_pci_dev() code)
to the DRM specific calls without adding the DRM allocated
pci devices to the pci_devices list.
Add a release for the lkpinew_pci_dev() (DRM) case so freeing
will work.
This allows the DRM created devices to use the normal kobj/refcount
logic and work with, e.g., pci_dev_put().
(For a slightly more detailed code walk see the review).

Sponsored-by: The FreeBSD Foundation
Obtained-from: bz_iwlwifi (partially)
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D28188

linuxkpi: Add more pci functions needed by DRM

-pci_get_class : This function search for a matching pci device based on
the class/subclass and returns a newly created pci_dev.
- pci_{save,restore}_state : This is analogous to ours with the same name
- pci_is_root_bus : Return true if this is the root bus
- pci_get_domain_bus_and_slot : This function search for a matching pci
device based on domain, bus and slot/function concat into a single
unsigned int (devfn) and returns a newly created pci_dev
- pci_bus_{read,write}_config* : Read/Write to the config space.

While here add some helper function to alloc and fill the pci_dev struct.

Reviewed by: hselasky, bz (older version)
Differential Revision: https://reviews.freebsd.org/D27550

compat: clean up empty lines in .c and .h files

Ensure pci_channel_offline() actually queries the PCI register space,
and not only the software cache of that register. Else
pci_channel_offline() won't detect that the PCI device is gone when
using the LinuxKPI.

MFC after: 1 week
Sponsored by: Mellanox Technologies

linuxkpi: add pci_dev_present

pci_dev_present shows if a set of pci ids are present in the system.
It just wraps pci_find_device.
Needed by DRMv5.2

Submitted by: Austing Shafer (ashafer@badland.io)
Differential Revision: https://reviews.freebsd.org/D24796

linuxkpi: Add pci_iomap and pci_iounmap

Those function are use to map/unmap io region of a pci device.
Different resource can be mapped depending on the bar so use a
tailq to store them all.

Sponsored-by: The FreeBSD Foundation

Reviewed by: emaste, hselasky
Differential Revision: https://reviews.freebsd.org/D24696

Implement more PCI-express bandwidth functions in the LinuxKPI.

Submitted by: ashafer_badland.io (Austin Shafer)
MFC after: 1 week
Sponsored by: Mellanox Technologies

Factor code in LinuxKPI to allow attach and detach using any BSD device.
This allows non-LinuxKPI based infiniband device drivers to attach
correctly to ibcore.

No functional change intended.

Reviewed by: np @
Differential Revision: https://reviews.freebsd.org/D24514
MFC after: 1 week
Sponsored by: Mellanox Technologies

Implement a workaround for kms-drm modules

pci_iov_if.h was added to pci.h, but none of the kms-drm branches have
that. Rather than play whack a mole with the branches, move its inclusion to
linux_pci.c which is the only part of the code that needs it now.

Longer term, other solutions will be needed, but this gives us time to get those
deployed on all the supported versions.

linuxkpi: Add infrastructure to pass FreeBSD IOV method calls into
pci_driver methods.

Reviewed by: hselasky
Sponsored by: Mellanox Technologies
MFC after: 2 weeks

Implement pci_enable_msi() and pci_disable_msi() in the LinuxKPI.
This patch makes the DRM graphics driver in ports usable on aarch64.

Submitted by: Greg V <greg@unrelenting.technology>
Differential Revision: https://reviews.freebsd.org/D21008
MFC after: 1 week
Sponsored by: Mellanox Technologies

Add necessary bits for Linux KPI to work correctly on powerpc

PowerPC, and possibly other architectures, use different address ranges for
PCI space vs physical address space, which is only mapped at resource
activation time, when the BAR gets written. The DRM kernel modules do not
activate the rman resources, soas not to waste KVA, instead only mapping
parts of the PCI memory at a time. This introduces a
BUS_TRANSLATE_RESOURCE() method, implemented in the Open Firmware/FDT PCI
driver, to perform this necessary translation without activating the
resource.

In addition to system KPI changes, LinuxKPI is updated to handle a
big-endian host, by adding proper endian swaps to the I/O functions.

Submitted by: mmacy
Reported by: hselasky
Differential Revision: https://reviews.freebsd.org/D21096

Implement linux_pci_unregister_drm_driver in linuxkpi so that drm drivers
can be unloaded.

This patch is a part of D19565.

Reviewed by: hps
Approved by: imp (mentor), hps
MFC after: 1 week

Use PCIV_INVALID in pci_channel_offline() in the LinuxKPI.

Build tested drm-current-kmod prior to commit.

MFC after: 1 week
Submitted by: slavash@
Sponsored by: Mellanox Technologies

Disabling a PCI device should only disable busmaster in the LinuxKPI.

As Linux comment for this function point:
Signal to the system that the PCI device is not in use by the system
anymore. This only involves disabling PCI bus-mastering, if active.

Build tested drm-current-kmod prior to commit.

MFC after: 1 week
Submitted by: slavash@
Sponsored by: Mellanox Technologies

LinuxKPI should use bus_dma(9) to be compatible with an IOMMU

Reviewed by: hselasky, kib
Tested by: greg@unrelenting.technology
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D19845

Implement more PCI speed related functions and macros in the LinuxKPI.

Submitted by: Johannes Lundberg <johalun0@gmail.com>
MFC after: 1 week
Sponsored by: Limelight Networks
Sponsored by: Mellanox Technologies

Add full support for PCI_ANY_ID when matching PCI IDs in the LinuxKPI.

MFC after: 1 week
Sponsored by: Mellanox Technologies

linuxkpi: Really check if PCI is offline

Currently we always return false if for PCI offline query.
Try to read PCI config, if the return value if 0xffff probably the
PCI is offline.

Approved by: hselasky (mentor)
MFC after: 1 week
Sponsored by: Mellanox Technologies

Implement support for the PCI_BUS_NUM() function macro in the LinuxKPI.

Submitted by: Johannes Lundberg <johalun0@gmail.com>
MFC after: 1 week
Sponsored by: Mellanox Technologies

Swap two instances of regular macros with function macros in the LinuxKPI,
to narrow down the substitution scope.

MFC after: 1 week
Sponsored by: Mellanox Technologies

linuxkpi whitespace cleanup

Reviewed by: hselasky, markj
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D14807

The pci_disable_device() function is also expected to clear the PCI
busmaster. This fixes LinuxKPI compliancy with Linux.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Clear old MSIX IRQ numbers in the LinuxKPI.

When disabling the MSIX IRQ vectors for a PCI device through the
LinuxKPI, make sure any old MSIX IRQ numbers are no longer visible to
the linux_pci_find_irq_dev() function else IRQs can be requested from
the wrong PCI device.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Add a specialized function for DRM drivers to register themselves.

Such drivers attach to a vgapci bus rather than directly to a pci bus. For
the rest of the LinuxKPI to work correctly in this case, we override the
vgapci bus' ivars with those of the grandparent.

Reviewed by: hselasky
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D11932

Add subsystem vendor and device ID fields to struct pci_dev.

MFC after: 1 week

Add some auxiliary types for device driver support.

MFC after: 1 week

Add a field for the class code to struct pci_driver.

Fill out some previously uninitialized fields as well.

MFC after: 1 week

Add some PCI class definitions.

MFC after: 1 week

Rename the "driver" field to "bsddriver" to avoid a name collision.

MFC after: 1 week

Implement pci_disable_device() in the LinuxKPI.

Submitted by: kmacy
MFC after: 2 weeks

Add some miscellaneous definitions to support DRM drivers.

Reviewed by: hselasky
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D10985

linuxkpi: Fix not-found case of linux_pci_find_irq_dev

Linux list_for_each_entry() does not neccessarily end with the iterator
NULL (it may be an offset from NULL if the list member is not the first
element of the member struct).

Reported by: Coverity
CID: 1366940
Reviewed by: hselasky@
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D8780

Add more LinuxKPI PCI definitions.

Obtained from: kmacy @
Sponsored by: Mellanox Technologies
MFC after: 1 week

Prefer function macros over regular macros in the LinuxKPI.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Prefix some _pci_xxx() functions in the Linux KPI with linux_ and make
sure the IRQ number used by these functions is unsigned.

Sponsored by: Mellanox Technologies
MFC after: 1 week

linuxkpi: Fix PCI BAR lazy allocation support.

FreeBSD supports lazy allocation of PCI BAR, that is, when a device
driver's attach method is invoked, even if the device's PCI BAR
address wasn't initialized, the invocation of bus_alloc_resource_any()
(the call chain: pci_alloc_resource() -> pci_alloc_multi_resource() ->
pci_reserve_map() -> pci_write_bar()) would allocate a proper address
for the PCI BAR and write this 'lazy allocated' address into the PCI
BAR.

This model works fine for native FreeBSD device drivers, but _not_ for
device drivers shared with Linux (e.g. dev/mlx5/mlx5_core/mlx5_main.c
and ofed/drivers/net/mlx4/main.c. Both of them use
pci_request_regions(), which doesn't work properly with the PCI BAR
lazy allocation, because pci_resource_type() -> _pci_get_rle() always
returns NULL, so pci_request_regions() doesn't have the opportunity to
invoke bus_alloc_resource_any(). We now use pci_find_bar() in
pci_resource_type(), which is able to locate all available PCI BARs
even if some of them will be lazy allocated.

Submitted by: Dexuan Cui <decui microsoft com>
Reviewed by: hps
MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8071

The IORESOURCE_XXX defines should resemble a bitmask while SYS_RES_XXX
are not bitmasks. Fix return value of pci_resource_flags() to reflect
this change.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Add more LinuxKPI PCI related functions and defines.
Removed comments deriving from Linux.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Implement support for PCI suspend, resume and shutdown events in the
LinuxKPI. Fix a few spaces to tabs. Bump the FreeBSD version to force
recompilation of existing KMODs.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Finish process of moving the LinuxKPI module into the default kernel build.

- Move all files related to the LinuxKPI into sys/compat/linuxkpi and
its subfolders.
- Update sys/conf/files and some Makefiles to use new file locations.
- Added description of COMPAT_LINUXKPI to sys/conf/NOTES which in turn
adds the LinuxKPI to all LINT builds.
- The LinuxKPI can be added to the kernel by setting the
COMPAT_LINUXKPI option. The OFED kernel option no longer builds the
LinuxKPI into the kernel. This was done to keep the build rules for
the LinuxKPI in sys/conf/files simple.
- Extend the LinuxKPI module to include support for USB by moving the
Linux USB compat from usb.ko to linuxkpi.ko.
- Bump the FreeBSD_version.
- A universe kernel build has been done.

Reviewed by: np @ (cxgb and cxgbe related changes only)
Sponsored by: Mellanox Technologies