wifi: mac80211: Add support for WBRF features

To support the WBRF mechanism, Wifi adapters utilized in the system must
register the frequencies in use (or unregister those frequencies no longer
used) via the dedicated calls. So that, other drivers responding to the
frequencies can take proper actions to mitigate possible interference.

Co-developed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Co-developed-by: Evan Quan <quanliangl@hotmail.com>
Signed-off-by: Evan Quan <quanliangl@hotmail.com>
Signed-off-by: Ma Jun <Jun.Ma2@amd.com>
Link: https://msgid.link/20231211100630.2170152-5-Jun.Ma2@amd.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/Makefile b/net/mac80211/Makefile
index c9eb527..4406b4f 100644 (file)
--- a/net/mac80211/Makefile
+++ b/net/mac80211/Makefile
@@ -67,4 +67,6 @@ mac80211-$(CONFIG_MAC80211_RC_MINSTREL) += $(rc80211_minstrel-y)
 
 obj-y += tests/
 
+mac80211-y += wbrf.o
+
 ccflags-y += -DDEBUG

diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 1d928f2..aa24585 100644 (file)
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -507,11 +507,16 @@ static void _ieee80211_change_chanctx(struct ieee80211_local *local,
 
        WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
 
+       ieee80211_remove_wbrf(local, &ctx->conf.def);
+
        ctx->conf.def = *chandef;
 
        /* check if min chanctx also changed */
        changed = IEEE80211_CHANCTX_CHANGE_WIDTH |
                  _ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for);
+
+       ieee80211_add_wbrf(local, &ctx->conf.def);
+
        drv_change_chanctx(local, ctx, changed);
 
        if (!local->use_chanctx) {
@@ -667,6 +672,8 @@ static int ieee80211_add_chanctx(struct ieee80211_local *local,
 
        lockdep_assert_wiphy(local->hw.wiphy);
 
+       ieee80211_add_wbrf(local, &ctx->conf.def);
+
        if (!local->use_chanctx)
                local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
 
@@ -746,6 +753,8 @@ static void ieee80211_del_chanctx(struct ieee80211_local *local,
        }
 
        ieee80211_recalc_idle(local);
+
+       ieee80211_remove_wbrf(local, &ctx->conf.def);
 }
 
 static void ieee80211_free_chanctx(struct ieee80211_local *local,

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 84df104..9dd5148 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1559,6 +1559,8 @@ struct ieee80211_local {
 
        /* extended capabilities provided by mac80211 */
        u8 ext_capa[8];
+
+       bool wbrf_supported;
 };
 
 static inline struct ieee80211_sub_if_data *
@@ -2600,4 +2602,9 @@ ieee80211_eht_cap_ie_to_sta_eht_cap(struct ieee80211_sub_if_data *sdata,
                                    const struct ieee80211_eht_cap_elem *eht_cap_ie_elem,
                                    u8 eht_cap_len,
                                    struct link_sta_info *link_sta);
+
+void ieee80211_check_wbrf_support(struct ieee80211_local *local);
+void ieee80211_add_wbrf(struct ieee80211_local *local, struct cfg80211_chan_def *chandef);
+void ieee80211_remove_wbrf(struct ieee80211_local *local, struct cfg80211_chan_def *chandef);
+
 #endif /* IEEE80211_I_H */

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 033a526..f2ece77 100644 (file)
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -1405,6 +1405,8 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
        debugfs_hw_add(local);
        rate_control_add_debugfs(local);
 
+       ieee80211_check_wbrf_support(local);
+
        rtnl_lock();
        wiphy_lock(hw->wiphy);
 

diff --git a/net/mac80211/wbrf.c b/net/mac80211/wbrf.c
new file mode 100644 (file)
index 0000000..a05c5b9
--- /dev/null
+++ b/net/mac80211/wbrf.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Wifi Band Exclusion Interface for WLAN
+ * Copyright (C) 2023 Advanced Micro Devices
+ *
+ */
+
+#include <linux/acpi_amd_wbrf.h>
+#include <linux/units.h>
+#include <net/cfg80211.h>
+#include "ieee80211_i.h"
+
+void ieee80211_check_wbrf_support(struct ieee80211_local *local)
+{
+       struct wiphy *wiphy = local->hw.wiphy;
+       struct device *dev;
+
+       if (!wiphy)
+               return;
+
+       dev = wiphy->dev.parent;
+       if (!dev)
+               return;
+
+       local->wbrf_supported = acpi_amd_wbrf_supported_producer(dev);
+       dev_dbg(dev, "WBRF is %s supported\n",
+               local->wbrf_supported ? "" : "not");
+}
+
+static void get_chan_freq_boundary(u32 center_freq, u32 bandwidth, u64 *start, u64 *end)
+{
+       bandwidth *= KHZ_PER_MHZ;
+       center_freq *= KHZ_PER_MHZ;
+
+       *start = center_freq - bandwidth / 2;
+       *end = center_freq + bandwidth / 2;
+
+       /* Frequency in Hz is expected */
+       *start = *start * HZ_PER_KHZ;
+       *end = *end * HZ_PER_KHZ;
+}
+
+static void get_ranges_from_chandef(struct cfg80211_chan_def *chandef,
+                                   struct wbrf_ranges_in_out *ranges_in)
+{
+       u64 start_freq1, end_freq1;
+       u64 start_freq2, end_freq2;
+       int bandwidth;
+
+       bandwidth = nl80211_chan_width_to_mhz(chandef->width);
+
+       get_chan_freq_boundary(chandef->center_freq1, bandwidth, &start_freq1, &end_freq1);
+
+       ranges_in->band_list[0].start = start_freq1;
+       ranges_in->band_list[0].end = end_freq1;
+       ranges_in->num_of_ranges = 1;
+
+       if (chandef->width == NL80211_CHAN_WIDTH_80P80) {
+               get_chan_freq_boundary(chandef->center_freq2, bandwidth, &start_freq2, &end_freq2);
+
+               ranges_in->band_list[1].start = start_freq2;
+               ranges_in->band_list[1].end = end_freq2;
+               ranges_in->num_of_ranges++;
+       }
+}
+
+void ieee80211_add_wbrf(struct ieee80211_local *local, struct cfg80211_chan_def *chandef)
+{
+       struct wbrf_ranges_in_out ranges_in = {0};
+       struct device *dev;
+
+       if (!local->wbrf_supported)
+               return;
+
+       dev = local->hw.wiphy->dev.parent;
+
+       get_ranges_from_chandef(chandef, &ranges_in);
+
+       acpi_amd_wbrf_add_remove(dev, WBRF_RECORD_ADD, &ranges_in);
+}
+
+void ieee80211_remove_wbrf(struct ieee80211_local *local, struct cfg80211_chan_def *chandef)
+{
+       struct wbrf_ranges_in_out ranges_in = {0};
+       struct device *dev;
+
+       if (!local->wbrf_supported)
+               return;
+
+       dev = local->hw.wiphy->dev.parent;
+
+       get_ranges_from_chandef(chandef, &ranges_in);
+
+       acpi_amd_wbrf_add_remove(dev, WBRF_RECORD_REMOVE, &ranges_in);
+}