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Immutable branch between pdx86 amd wbrf branch and wifi / amdgpu due for the v6.8 merge window
platform-drivers-x86-amd-wbrf-v6.8-1: v6.7-rc1 + AMD WBRF support for merging into the wifi subsys and amdgpu driver for 6.8. -----BEGIN PGP SIGNATURE----- iQFIBAABCAAyFiEEuvA7XScYQRpenhd+kuxHeUQDJ9wFAmV26S0UHGhkZWdvZWRl QHJlZGhhdC5jb20ACgkQkuxHeUQDJ9xhrggAndnZ23OehAMs+Tl5usEm/9RE6Al2 M9i/P3s2uzBUg4cRTAY0BLsNHIg9zvLv8unrJ0xoPQuoV/vI0864PMLQ1miVyvIa V99/Cz/eCH0wZp9ADE1dL7EYI76aj5TXGgAxExTJ3EKVg5j/jWMkLLrsMZNT/23Z YDPcDEPpaAGaKmJf0sJd+TRMn5hyJCVmkre9CEXJGDaogsX0BJGIhJ3nA2GzAwQ+ 1oMxlkzMoECQ3U5ilzRtdREvmZtO1mjwUmwGMDZBKGwEvm0B8CrxDGmQjjMJcqTW a85EeS/C3q+U7Pexq6/Wkixmv2pIuNzbQ1SV0P+qky8lPd6Rzp2fSmnnOg== =UXod -----END PGP SIGNATURE----- Merge tag 'platform-drivers-x86-amd-wbrf-v6.8-1' into wireless-next Merge the platform drivers tag for WRBF. Hans says: Immutable branch between pdx86 amd wbrf branch and wifi / amdgpu due for the v6.8 merge window platform-drivers-x86-amd-wbrf-v6.8-1: v6.7-rc1 + AMD WBRF support for merging into the wifi subsys and amdgpu driver for 6.8. Merge it so we can apply the wifi tie-in for this feature. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg
commit
383052d09a
@ -115,6 +115,7 @@ available subsections can be seen below.
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hte/index
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wmi
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dpll
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wbrf
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.. only:: subproject and html
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78
Documentation/driver-api/wbrf.rst
Normal file
78
Documentation/driver-api/wbrf.rst
Normal file
@ -0,0 +1,78 @@
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.. SPDX-License-Identifier: GPL-2.0-or-later
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=================================
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WBRF - Wifi Band RFI Mitigations
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=================================
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Due to electrical and mechanical constraints in certain platform designs
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there may be likely interference of relatively high-powered harmonics of
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the GPU memory clocks with local radio module frequency bands used by
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certain Wifi bands.
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To mitigate possible RFI interference producers can advertise the
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frequencies in use and consumers can use this information to avoid using
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these frequencies for sensitive features.
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When a platform is known to have this issue with any contained devices,
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the platform designer will advertise the availability of this feature via
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ACPI devices with a device specific method (_DSM).
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* Producers with this _DSM will be able to advertise the frequencies in use.
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* Consumers with this _DSM will be able to register for notifications of
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frequencies in use.
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Some general terms
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==================
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Producer: such component who can produce high-powered radio frequency
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Consumer: such component who can adjust its in-use frequency in
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response to the radio frequencies of other components to mitigate the
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possible RFI.
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To make the mechanism function, those producers should notify active use
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of their particular frequencies so that other consumers can make relative
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internal adjustments as necessary to avoid this resonance.
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ACPI interface
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==============
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Although initially used by for wifi + dGPU use cases, the ACPI interface
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can be scaled to any type of device that a platform designer discovers
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can cause interference.
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The GUID used for the _DSM is 7B7656CF-DC3D-4C1C-83E9-66E721DE3070.
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3 functions are available in this _DSM:
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* 0: discover # of functions available
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* 1: record RF bands in use
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* 2: retrieve RF bands in use
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Driver programming interface
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============================
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.. kernel-doc:: drivers/platform/x86/amd/wbrf.c
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Sample Usage
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=============
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The expected flow for the producers:
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1. During probe, call `acpi_amd_wbrf_supported_producer` to check if WBRF
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can be enabled for the device.
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2. On using some frequency band, call `acpi_amd_wbrf_add_remove` with 'add'
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param to get other consumers properly notified.
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3. Or on stopping using some frequency band, call
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`acpi_amd_wbrf_add_remove` with 'remove' param to get other consumers notified.
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The expected flow for the consumers:
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1. During probe, call `acpi_amd_wbrf_supported_consumer` to check if WBRF
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can be enabled for the device.
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2. Call `amd_wbrf_register_notifier` to register for notification
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of frequency band change(add or remove) from other producers.
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3. Call the `amd_wbrf_retrieve_freq_band` initally to retrieve
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current active frequency bands considering some producers may broadcast
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such information before the consumer is up.
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4. On receiving a notification for frequency band change, run
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`amd_wbrf_retrieve_freq_band` again to retrieve the latest
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active frequency bands.
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5. During driver cleanup, call `amd_wbrf_unregister_notifier` to
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unregister the notifier.
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@ -18,3 +18,17 @@ config AMD_HSMP
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If you choose to compile this driver as a module the module will be
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called amd_hsmp.
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config AMD_WBRF
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bool "AMD Wifi RF Band mitigations (WBRF)"
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depends on ACPI
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help
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WBRF(Wifi Band RFI mitigation) mechanism allows Wifi drivers
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to notify the frequencies they are using so that other hardware
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can be reconfigured to avoid harmonic conflicts.
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AMD provides an ACPI based mechanism to support WBRF on platform with
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appropriate underlying support.
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This mechanism will only be activated on platforms that advertise a
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need for it.
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@ -8,3 +8,4 @@ obj-$(CONFIG_AMD_PMC) += pmc/
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amd_hsmp-y := hsmp.o
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obj-$(CONFIG_AMD_HSMP) += amd_hsmp.o
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obj-$(CONFIG_AMD_PMF) += pmf/
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obj-$(CONFIG_AMD_WBRF) += wbrf.o
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317
drivers/platform/x86/amd/wbrf.c
Normal file
317
drivers/platform/x86/amd/wbrf.c
Normal file
@ -0,0 +1,317 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Wifi Frequency Band Manage Interface
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* Copyright (C) 2023 Advanced Micro Devices
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*/
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#include <linux/acpi.h>
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#include <linux/acpi_amd_wbrf.h>
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/*
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* Functions bit vector for WBRF method
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*
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* Bit 0: WBRF supported.
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* Bit 1: Function 1 (Add / Remove frequency) is supported.
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* Bit 2: Function 2 (Get frequency list) is supported.
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*/
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#define WBRF_ENABLED 0x0
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#define WBRF_RECORD 0x1
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#define WBRF_RETRIEVE 0x2
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#define WBRF_REVISION 0x1
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/*
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* The data structure used for WBRF_RETRIEVE is not naturally aligned.
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* And unfortunately the design has been settled down.
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*/
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struct amd_wbrf_ranges_out {
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u32 num_of_ranges;
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struct freq_band_range band_list[MAX_NUM_OF_WBRF_RANGES];
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} __packed;
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static const guid_t wifi_acpi_dsm_guid =
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GUID_INIT(0x7b7656cf, 0xdc3d, 0x4c1c,
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0x83, 0xe9, 0x66, 0xe7, 0x21, 0xde, 0x30, 0x70);
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/*
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* Used to notify consumer (amdgpu driver currently) about
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* the wifi frequency is change.
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*/
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static BLOCKING_NOTIFIER_HEAD(wbrf_chain_head);
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static int wbrf_record(struct acpi_device *adev, uint8_t action, struct wbrf_ranges_in_out *in)
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{
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union acpi_object argv4;
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union acpi_object *tmp;
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union acpi_object *obj;
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u32 num_of_ranges = 0;
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u32 num_of_elements;
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u32 arg_idx = 0;
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int ret;
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u32 i;
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if (!in)
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(in->band_list); i++) {
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if (in->band_list[i].start && in->band_list[i].end)
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num_of_ranges++;
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}
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/*
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* The num_of_ranges value in the "in" object supplied by
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* the caller is required to be equal to the number of
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* entries in the band_list array in there.
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*/
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if (num_of_ranges != in->num_of_ranges)
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return -EINVAL;
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/*
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* Every input frequency band comes with two end points(start/end)
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* and each is accounted as an element. Meanwhile the range count
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* and action type are accounted as an element each.
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* So, the total element count = 2 * num_of_ranges + 1 + 1.
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*/
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num_of_elements = 2 * num_of_ranges + 2;
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tmp = kcalloc(num_of_elements, sizeof(*tmp), GFP_KERNEL);
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if (!tmp)
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return -ENOMEM;
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argv4.package.type = ACPI_TYPE_PACKAGE;
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argv4.package.count = num_of_elements;
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argv4.package.elements = tmp;
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/* save the number of ranges*/
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tmp[0].integer.type = ACPI_TYPE_INTEGER;
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tmp[0].integer.value = num_of_ranges;
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/* save the action(WBRF_RECORD_ADD/REMOVE/RETRIEVE) */
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tmp[1].integer.type = ACPI_TYPE_INTEGER;
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tmp[1].integer.value = action;
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arg_idx = 2;
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for (i = 0; i < ARRAY_SIZE(in->band_list); i++) {
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if (!in->band_list[i].start || !in->band_list[i].end)
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continue;
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tmp[arg_idx].integer.type = ACPI_TYPE_INTEGER;
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tmp[arg_idx++].integer.value = in->band_list[i].start;
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tmp[arg_idx].integer.type = ACPI_TYPE_INTEGER;
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tmp[arg_idx++].integer.value = in->band_list[i].end;
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}
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obj = acpi_evaluate_dsm(adev->handle, &wifi_acpi_dsm_guid,
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WBRF_REVISION, WBRF_RECORD, &argv4);
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if (!obj)
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return -EINVAL;
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if (obj->type != ACPI_TYPE_INTEGER) {
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ret = -EINVAL;
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goto out;
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}
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ret = obj->integer.value;
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if (ret)
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ret = -EINVAL;
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out:
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ACPI_FREE(obj);
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kfree(tmp);
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return ret;
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}
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/**
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* acpi_amd_wbrf_add_remove - add or remove the frequency band the device is using
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*
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* @dev: device pointer
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* @action: remove or add the frequency band into bios
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* @in: input structure containing the frequency band the device is using
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*
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* Broadcast to other consumers the frequency band the device starts
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* to use. Underneath the surface the information is cached into an
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* internal buffer first. Then a notification is sent to all those
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* registered consumers. So then they can retrieve that buffer to
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* know the latest active frequency bands. Consumers that haven't
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* yet been registered can retrieve the information from the cache
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* when they register.
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*
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* Return:
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* 0 for success add/remove wifi frequency band.
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* Returns a negative error code for failure.
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*/
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int acpi_amd_wbrf_add_remove(struct device *dev, uint8_t action, struct wbrf_ranges_in_out *in)
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{
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struct acpi_device *adev;
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int ret;
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adev = ACPI_COMPANION(dev);
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if (!adev)
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return -ENODEV;
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ret = wbrf_record(adev, action, in);
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if (ret)
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return ret;
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blocking_notifier_call_chain(&wbrf_chain_head, WBRF_CHANGED, NULL);
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return 0;
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}
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EXPORT_SYMBOL_GPL(acpi_amd_wbrf_add_remove);
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/**
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* acpi_amd_wbrf_supported_producer - determine if the WBRF can be enabled
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* for the device as a producer
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*
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* @dev: device pointer
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*
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* Check if the platform equipped with necessary implementations to
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* support WBRF for the device as a producer.
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*
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* Return:
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* true if WBRF is supported, otherwise returns false
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*/
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bool acpi_amd_wbrf_supported_producer(struct device *dev)
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{
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struct acpi_device *adev;
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adev = ACPI_COMPANION(dev);
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if (!adev)
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return false;
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|
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return acpi_check_dsm(adev->handle, &wifi_acpi_dsm_guid,
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WBRF_REVISION, BIT(WBRF_RECORD));
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}
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EXPORT_SYMBOL_GPL(acpi_amd_wbrf_supported_producer);
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/**
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* acpi_amd_wbrf_supported_consumer - determine if the WBRF can be enabled
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||||
* for the device as a consumer
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||||
*
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||||
* @dev: device pointer
|
||||
*
|
||||
* Determine if the platform equipped with necessary implementations to
|
||||
* support WBRF for the device as a consumer.
|
||||
*
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||||
* Return:
|
||||
* true if WBRF is supported, otherwise returns false.
|
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*/
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||||
bool acpi_amd_wbrf_supported_consumer(struct device *dev)
|
||||
{
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||||
struct acpi_device *adev;
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||||
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||||
adev = ACPI_COMPANION(dev);
|
||||
if (!adev)
|
||||
return false;
|
||||
|
||||
return acpi_check_dsm(adev->handle, &wifi_acpi_dsm_guid,
|
||||
WBRF_REVISION, BIT(WBRF_RETRIEVE));
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(acpi_amd_wbrf_supported_consumer);
|
||||
|
||||
/**
|
||||
* amd_wbrf_retrieve_freq_band - retrieve current active frequency bands
|
||||
*
|
||||
* @dev: device pointer
|
||||
* @out: output structure containing all the active frequency bands
|
||||
*
|
||||
* Retrieve the current active frequency bands which were broadcasted
|
||||
* by other producers. The consumer who calls this API should take
|
||||
* proper actions if any of the frequency band may cause RFI with its
|
||||
* own frequency band used.
|
||||
*
|
||||
* Return:
|
||||
* 0 for getting wifi freq band successfully.
|
||||
* Returns a negative error code for failure.
|
||||
*/
|
||||
int amd_wbrf_retrieve_freq_band(struct device *dev, struct wbrf_ranges_in_out *out)
|
||||
{
|
||||
struct amd_wbrf_ranges_out acpi_out = {0};
|
||||
struct acpi_device *adev;
|
||||
union acpi_object *obj;
|
||||
union acpi_object param;
|
||||
int ret = 0;
|
||||
|
||||
adev = ACPI_COMPANION(dev);
|
||||
if (!adev)
|
||||
return -ENODEV;
|
||||
|
||||
param.type = ACPI_TYPE_STRING;
|
||||
param.string.length = 0;
|
||||
param.string.pointer = NULL;
|
||||
|
||||
obj = acpi_evaluate_dsm(adev->handle, &wifi_acpi_dsm_guid,
|
||||
WBRF_REVISION, WBRF_RETRIEVE, ¶m);
|
||||
if (!obj)
|
||||
return -EINVAL;
|
||||
|
||||
/*
|
||||
* The return buffer is with variable length and the format below:
|
||||
* number_of_entries(1 DWORD): Number of entries
|
||||
* start_freq of 1st entry(1 QWORD): Start frequency of the 1st entry
|
||||
* end_freq of 1st entry(1 QWORD): End frequency of the 1st entry
|
||||
* ...
|
||||
* ...
|
||||
* start_freq of the last entry(1 QWORD)
|
||||
* end_freq of the last entry(1 QWORD)
|
||||
*
|
||||
* Thus the buffer length is determined by the number of entries.
|
||||
* - For zero entry scenario, the buffer length will be 4 bytes.
|
||||
* - For one entry scenario, the buffer length will be 20 bytes.
|
||||
*/
|
||||
if (obj->buffer.length > sizeof(acpi_out) || obj->buffer.length < 4) {
|
||||
dev_err(dev, "Wrong sized WBRT information");
|
||||
ret = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
memcpy(&acpi_out, obj->buffer.pointer, obj->buffer.length);
|
||||
|
||||
out->num_of_ranges = acpi_out.num_of_ranges;
|
||||
memcpy(out->band_list, acpi_out.band_list, sizeof(acpi_out.band_list));
|
||||
|
||||
out:
|
||||
ACPI_FREE(obj);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(amd_wbrf_retrieve_freq_band);
|
||||
|
||||
/**
|
||||
* amd_wbrf_register_notifier - register for notifications of frequency
|
||||
* band update
|
||||
*
|
||||
* @nb: driver notifier block
|
||||
*
|
||||
* The consumer should register itself via this API so that it can get
|
||||
* notified on the frequency band updates from other producers.
|
||||
*
|
||||
* Return:
|
||||
* 0 for registering a consumer driver successfully.
|
||||
* Returns a negative error code for failure.
|
||||
*/
|
||||
int amd_wbrf_register_notifier(struct notifier_block *nb)
|
||||
{
|
||||
return blocking_notifier_chain_register(&wbrf_chain_head, nb);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(amd_wbrf_register_notifier);
|
||||
|
||||
/**
|
||||
* amd_wbrf_unregister_notifier - unregister for notifications of
|
||||
* frequency band update
|
||||
*
|
||||
* @nb: driver notifier block
|
||||
*
|
||||
* The consumer should call this API when it is longer interested with
|
||||
* the frequency band updates from other producers. Usually, this should
|
||||
* be performed during driver cleanup.
|
||||
*
|
||||
* Return:
|
||||
* 0 for unregistering a consumer driver.
|
||||
* Returns a negative error code for failure.
|
||||
*/
|
||||
int amd_wbrf_unregister_notifier(struct notifier_block *nb)
|
||||
{
|
||||
return blocking_notifier_chain_unregister(&wbrf_chain_head, nb);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(amd_wbrf_unregister_notifier);
|
||||
91
include/linux/acpi_amd_wbrf.h
Normal file
91
include/linux/acpi_amd_wbrf.h
Normal file
@ -0,0 +1,91 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
/*
|
||||
* Wifi Band Exclusion Interface (AMD ACPI Implementation)
|
||||
* Copyright (C) 2023 Advanced Micro Devices
|
||||
*/
|
||||
|
||||
#ifndef _ACPI_AMD_WBRF_H
|
||||
#define _ACPI_AMD_WBRF_H
|
||||
|
||||
#include <linux/device.h>
|
||||
#include <linux/notifier.h>
|
||||
|
||||
/* The maximum number of frequency band ranges */
|
||||
#define MAX_NUM_OF_WBRF_RANGES 11
|
||||
|
||||
/* Record actions */
|
||||
#define WBRF_RECORD_ADD 0x0
|
||||
#define WBRF_RECORD_REMOVE 0x1
|
||||
|
||||
/**
|
||||
* struct freq_band_range - Wifi frequency band range definition
|
||||
* @start: start frequency point (in Hz)
|
||||
* @end: end frequency point (in Hz)
|
||||
*/
|
||||
struct freq_band_range {
|
||||
u64 start;
|
||||
u64 end;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct wbrf_ranges_in_out - wbrf ranges info
|
||||
* @num_of_ranges: total number of band ranges in this struct
|
||||
* @band_list: array of Wifi band ranges
|
||||
*/
|
||||
struct wbrf_ranges_in_out {
|
||||
u64 num_of_ranges;
|
||||
struct freq_band_range band_list[MAX_NUM_OF_WBRF_RANGES];
|
||||
};
|
||||
|
||||
/**
|
||||
* enum wbrf_notifier_actions - wbrf notifier actions index
|
||||
* @WBRF_CHANGED: there was some frequency band updates. The consumers
|
||||
* should retrieve the latest active frequency bands.
|
||||
*/
|
||||
enum wbrf_notifier_actions {
|
||||
WBRF_CHANGED,
|
||||
};
|
||||
|
||||
#if IS_ENABLED(CONFIG_AMD_WBRF)
|
||||
bool acpi_amd_wbrf_supported_producer(struct device *dev);
|
||||
int acpi_amd_wbrf_add_remove(struct device *dev, uint8_t action, struct wbrf_ranges_in_out *in);
|
||||
bool acpi_amd_wbrf_supported_consumer(struct device *dev);
|
||||
int amd_wbrf_retrieve_freq_band(struct device *dev, struct wbrf_ranges_in_out *out);
|
||||
int amd_wbrf_register_notifier(struct notifier_block *nb);
|
||||
int amd_wbrf_unregister_notifier(struct notifier_block *nb);
|
||||
#else
|
||||
static inline
|
||||
bool acpi_amd_wbrf_supported_consumer(struct device *dev)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
static inline
|
||||
int acpi_amd_wbrf_add_remove(struct device *dev, uint8_t action, struct wbrf_ranges_in_out *in)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
static inline
|
||||
bool acpi_amd_wbrf_supported_producer(struct device *dev)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
static inline
|
||||
int amd_wbrf_retrieve_freq_band(struct device *dev, struct wbrf_ranges_in_out *out)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
static inline
|
||||
int amd_wbrf_register_notifier(struct notifier_block *nb)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
static inline
|
||||
int amd_wbrf_unregister_notifier(struct notifier_block *nb)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
#endif /* CONFIG_AMD_WBRF */
|
||||
|
||||
#endif /* _ACPI_AMD_WBRF_H */
|
||||
Loading…
Reference in New Issue
Block a user