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From: Harshitha Prem <quic_hprem@quicinc.com>
To: ath12k@lists.infradead.org
Cc: linux-wireless@vger.kernel.org,
        Karthikeyan Periyasamy <quic_periyasa@quicinc.com>,
        Harshitha Prem <quic_hprem@quicinc.com>
Subject: [PATCH v4 8/8] wifi: ath12k: move ath12k_hw from per soc to group
Date: Tue,  7 May 2024 10:27:02 +0530
Message-Id: <20240507045702.2858954-9-quic_hprem@quicinc.com>
In-Reply-To: <20240507045702.2858954-1-quic_hprem@quicinc.com>
References: <20240507045702.2858954-1-quic_hprem@quicinc.com>
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From: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>

Currently, hardware abstractions (ah) of different radio bands
are tightly coupled to a single device (ab). But, with hardware
device group abstraction (ag), multiple radios across different
devices in a group can possibly form different combinations of
hardware abstractions (ah) within the group. Hence, the mapping
between ah to ab can be removed and instead it can be mapped with ag.

Please find below illustration of how mapping between ath12k_hw (ah),
ath12k_base (ab) and ath12k_hw_group (ag) is changed.

        current mapping of hardware abstraction (ah) with device (ab)
            +------------------------------------------------+
            |  +-------------------------------------+       |
            |  | +---------------+ +---------------+ |       |
            |  | |ath12k_hw (ah) | |ath12k_hw (ah) | |       |
            |  | +---------------+ +---------------+ |       |
            |  |                                     |       |
            |  |  +-----------+ |   +-----------+    |       |
            |  |  | ar (2GHz) | |   | ar (5GHz) |    |       |
            |  |  +-----------+ |   +-----------+    |       |
            |  |          Dual band device-1 (ab)    |       |
            |  +-------------------------------------+       |
            |    ath12k_hw_group (ag) based on group id      |
            +------------------------------------------------+

                After, with hardware device group abstraction
                (moving ah array out of ab to ag)
            +----------------------------------------------+
            |   +---------------+  +---------------+       |
            |   |ath12k_hw (ah) |  |ath12k_hw (ah) |       |
            |   +---------------+  +---------------+       |
            |  +-------------------------------------+     |
            |  | +-----------+     +-----------+     |     |
            |  | | ar (2GHz) |     | ar (5GHz) |     |     |
            |  | +-----------+     +-----------+     |     |
            |  |     Dual band device-1 (ab)         |     |
            |  +-------------------------------------+     |
            |   ath12k_hw_group (ag) based on group id     |
            +----------------------------------------------+

This decoupling of ath12k_hw (ah) from ath12k_base (ab) and mapping it
to ath12k_hw_group (ag) will help in forming different combinations of
multi-link devices.

Say for example, device 1 has two radios (2 GHz and 5 GHz band) and
device 2 has one radio (6 GHz).

In existing code -
        device 1 will have two hardware abstractions hw1 (2 GHz) and
        hw2 (5 GHz) will be registered separately to mac80211 as phy0
        and phy1 respectively. Similarly, device 2 will register its
        hw (6 GHz) as phy2 to mac80211.

In future, with multi-link abstraction

        combination 1 - Different group id for device1 and device 2
                Device 1 will create a single hardware abstraction hw1
                (2 GHz and 5 GHz) and will be registered to mac80211 as
                phy0. similarly, device 2 will register its hardware
                (6 GHz) to mac80211 as phy1.

        combination 2 - Same group id for device1 and device 2
                Both device details are combined together as a group, say
                group1, with single hardware abstraction of radios 2 GHz,
                5 GHz and 6 GHz band details and will be registered to
                mac80211 as phy0.

Hence, Add changes to decouple ath12k_hw (ah) from ath12k_base (ab) and
map it to ath12k_hw_group (ag).

Refactor the following APIs to help simplify the registration based on
ath12k_hw_group (ag) rather than ath12k_base (ab)
        * ath12k_mac_allocate()
        * ath12k_mac_destroy()
        * ath12k_mac_register()
        * ath12k_mac_unregister()

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1

Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
Signed-off-by: Harshitha Prem <quic_hprem@quicinc.com>
---
 drivers/net/wireless/ath/ath12k/core.c | 52 +++++++----------
 drivers/net/wireless/ath/ath12k/core.h | 25 ++++----
 drivers/net/wireless/ath/ath12k/mac.c  | 81 ++++++++++++++++++--------
 drivers/net/wireless/ath/ath12k/mac.h  |  9 +--
 4 files changed, 98 insertions(+), 69 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/core.c b/drivers/net/wireless/ath/ath12k/core.c
index 1165baf31211..88b14343d91f 100644
--- a/drivers/net/wireless/ath/ath12k/core.c
+++ b/drivers/net/wireless/ath/ath12k/core.c
@@ -833,11 +833,6 @@ static void ath12k_core_device_cleanup(struct ath12k_base *ab)
 	if (test_bit(ATH12K_FLAG_PDEV_CREATED, &ab->dev_flags))
 		ath12k_core_pdev_destroy(ab);
 
-	if (test_bit(ATH12K_FLAG_REGISTERED, &ab->dev_flags)) {
-		ath12k_mac_unregister(ab);
-		ath12k_mac_destroy(ab);
-	}
-
 	mutex_unlock(&ab->core_lock);
 }
 
@@ -854,6 +849,8 @@ static void ath12k_core_hw_group_stop(struct ath12k_hw_group *ag)
 			continue;
 		ath12k_core_device_cleanup(ab);
 	}
+	ath12k_mac_unregister(ag);
+	ath12k_mac_destroy(ag);
 }
 
 static int ath12k_core_hw_group_start(struct ath12k_hw_group *ag)
@@ -864,6 +861,23 @@ static int ath12k_core_hw_group_start(struct ath12k_hw_group *ag)
 
 	lockdep_assert_held(&ag->mutex_lock);
 
+	/* Check if already registered or not, since same flow
+	 * execute for HW restart case.
+	 */
+	is_registered = test_bit(ATH12K_GROUP_FLAG_REGISTERED, &ag->flags);
+
+	if (is_registered)
+		goto core_pdev_create;
+
+	ret = ath12k_mac_allocate(ag);
+	if (WARN_ON(ret))
+		return ret;
+
+	ret = ath12k_mac_register(ag);
+	if (WARN_ON(ret))
+		goto err_mac_alloc;
+
+core_pdev_create:
 	for (i = 0; i < ag->num_devices; i++) {
 		ab = ag->ab[i];
 		if (!ab)
@@ -871,31 +885,6 @@ static int ath12k_core_hw_group_start(struct ath12k_hw_group *ag)
 
 		mutex_lock(&ab->core_lock);
 
-		/* Check if already registered or not, since same flow
-		 * execute for HW restart case.
-		 */
-		is_registered = test_bit(ATH12K_FLAG_REGISTERED, &ab->dev_flags);
-
-		if (is_registered)
-			goto core_pdev_create;
-
-		ret = ath12k_mac_allocate(ab);
-		if (ret) {
-			ath12k_err(ab, "failed to create new hw device with mac80211 :%d\n",
-				   ret);
-			mutex_unlock(&ab->core_lock);
-			return ret;
-		}
-
-		ret = ath12k_mac_register(ab);
-		if (ret) {
-			ath12k_err(ab, "failed to register radio with mac80211: %d\n",
-				   ret);
-			mutex_unlock(&ab->core_lock);
-			goto err;
-		}
-
-core_pdev_create:
 		ret = ath12k_core_pdev_create(ab);
 		if (ret) {
 			ath12k_err(ab, "failed to create pdev core %d\n", ret);
@@ -922,7 +911,10 @@ static int ath12k_core_hw_group_start(struct ath12k_hw_group *ag)
 
 err:
 	ath12k_core_hw_group_stop(ag);
+	return ret;
 
+err_mac_alloc:
+	ath12k_mac_destroy(ag);
 	return ret;
 }
 
diff --git a/drivers/net/wireless/ath/ath12k/core.h b/drivers/net/wireless/ath/ath12k/core.h
index 2c3c585797cf..58cd5428502b 100644
--- a/drivers/net/wireless/ath/ath12k/core.h
+++ b/drivers/net/wireless/ath/ath12k/core.h
@@ -60,6 +60,7 @@
 #define ATH12K_RECOVER_START_TIMEOUT_HZ		(20 * HZ)
 
 #define ATH12K_MAX_SOCS 3
+#define ATH12K_GROUP_MAX_RADIO (ATH12K_MAX_SOCS * MAX_RADIOS)
 #define ATH12K_INVALID_GROUP_ID  0xFF
 #define ATH12K_INVALID_DEVICE_ID 0xFF
 
@@ -755,6 +756,15 @@ struct ath12k_hw_group {
 	struct ath12k_base *ab[ATH12K_MAX_SOCS];
 	/* To synchronize group create, assign, start, stop */
 	struct mutex mutex_lock;
+
+	/* Holds information of wiphy (hw) registration.
+	 *
+	 * In Multi/Single Link Operation case, all pdevs are registered as
+	 * a single wiphy. In other (legacy/Non-MLO) cases, each pdev is
+	 * registered as separate wiphys.
+	 */
+	struct ath12k_hw *ah[MAX_RADIOS];
+	u8 num_hw;
 };
 
 /**
@@ -826,15 +836,6 @@ struct ath12k_base {
 
 	struct ath12k_pdev __rcu *pdevs_active[MAX_RADIOS];
 
-	/* Holds information of wiphy (hw) registration.
-	 *
-	 * In Multi/Single Link Operation case, all pdevs are registered as
-	 * a single wiphy. In other (legacy/Non-MLO) cases, each pdev is
-	 * registered as separate wiphys.
-	 */
-	struct ath12k_hw *ah[MAX_RADIOS];
-	u8 num_hw;
-
 	struct ath12k_wmi_hal_reg_capabilities_ext_arg hal_reg_cap[MAX_RADIOS];
 	unsigned long long free_vdev_map;
 	unsigned long long free_vdev_stats_id_map;
@@ -1090,18 +1091,18 @@ static inline struct ieee80211_hw *ath12k_ar_to_hw(struct ath12k *ar)
 
 static inline struct ath12k_hw *ath12k_ab_to_ah(struct ath12k_base *ab, int idx)
 {
-	return ab->ah[idx];
+	return ab->ag->ah[idx];
 }
 
 static inline void ath12k_ab_set_ah(struct ath12k_base *ab, int idx,
 				    struct ath12k_hw *ah)
 {
-	ab->ah[idx] = ah;
+	ab->ag->ah[idx] = ah;
 }
 
 static inline int ath12k_get_num_hw(struct ath12k_base *ab)
 {
-	return ab->num_hw;
+	return ab->ag->num_hw;
 }
 
 static inline
diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index ada4569fbff4..256095042948 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -8872,19 +8872,13 @@ static void ath12k_mac_setup(struct ath12k *ar)
 	clear_bit(ATH12K_FLAG_MONITOR_ENABLED, &ar->monitor_flags);
 }
 
-int ath12k_mac_register(struct ath12k_base *ab)
+int ath12k_mac_register(struct ath12k_hw_group *ag)
 {
+	struct ath12k_base *ab = ag->ab[0];
 	struct ath12k_hw *ah;
 	int i;
 	int ret;
 
-	if (test_bit(ATH12K_FLAG_REGISTERED, &ab->dev_flags))
-		return 0;
-
-	/* Initialize channel counters frequency value in hertz */
-	ab->cc_freq_hz = 320000;
-	ab->free_vdev_map = (1LL << (ab->num_radios * TARGET_NUM_VDEVS)) - 1;
-
 	for (i = 0; i < ath12k_get_num_hw(ab); i++) {
 		ah = ath12k_ab_to_ah(ab, i);
 
@@ -8908,8 +8902,9 @@ int ath12k_mac_register(struct ath12k_base *ab)
 	return ret;
 }
 
-void ath12k_mac_unregister(struct ath12k_base *ab)
+void ath12k_mac_unregister(struct ath12k_hw_group *ag)
 {
+	struct ath12k_base *ab = ag->ab[0];
 	struct ath12k_hw *ah;
 	int i;
 
@@ -8970,18 +8965,24 @@ static struct ath12k_hw *ath12k_mac_hw_allocate(struct ath12k_base *ab,
 	return ah;
 }
 
-void ath12k_mac_destroy(struct ath12k_base *ab)
+void ath12k_mac_destroy(struct ath12k_hw_group *ag)
 {
 	struct ath12k_pdev *pdev;
-	struct ath12k_hw *ah;
+	struct ath12k_base *ab = ag->ab[0];
 	int i;
+	struct ath12k_hw *ah;
 
-	for (i = 0; i < ab->num_radios; i++) {
-		pdev = &ab->pdevs[i];
-		if (!pdev->ar)
+	for (i = 0; i < ag->num_devices; i++) {
+		ab = ag->ab[i];
+		if (!ab)
 			continue;
 
-		pdev->ar = NULL;
+		for (i = 0; i < ab->num_radios; i++) {
+			pdev = &ab->pdevs[i];
+			if (!pdev->ar)
+				continue;
+			pdev->ar = NULL;
+		}
 	}
 
 	for (i = 0; i < ath12k_get_num_hw(ab); i++) {
@@ -8994,20 +8995,46 @@ void ath12k_mac_destroy(struct ath12k_base *ab)
 	}
 }
 
-int ath12k_mac_allocate(struct ath12k_base *ab)
+static void ath12k_set_device_defaults(struct ath12k_base *ab)
+{
+	/* Initialize channel counters frequency value in hertz */
+	ab->cc_freq_hz = 320000;
+	ab->free_vdev_map = (1LL << (ab->num_radios * TARGET_NUM_VDEVS)) - 1;
+	ath12k_dp_pdev_pre_alloc(ab);
+}
+
+int ath12k_mac_allocate(struct ath12k_hw_group *ag)
 {
 	struct ath12k_hw *ah;
+	struct ath12k_base *ab;
 	struct ath12k_pdev_map pdev_map[MAX_RADIOS];
 	int ret, i, j;
 	u8 radio_per_hw;
+	int mac_id, device_id;
+	int total_radio, num_hw;
 
-	if (test_bit(ATH12K_FLAG_REGISTERED, &ab->dev_flags))
-		return 0;
+	total_radio = 0;
+	for (i = 0; i < ag->num_devices; i++)
+		total_radio += ag->ab[i]->num_radios;
 
-	ab->num_hw = ab->num_radios;
+	/* All pdev get combined and register as single wiphy based on
+	 * hardware group which participate in multi-link operation else
+	 * each pdev get register separately.
+	 *
+	 * Currently, registering as single pdevs.
+	 */
 	radio_per_hw = 1;
+	num_hw = total_radio / radio_per_hw;
+
+	if (WARN_ON(num_hw >= ATH12K_GROUP_MAX_RADIO))
+		return -ENOSPC;
+
+	ag->num_hw = 0;
+	device_id = 0;
+	mac_id = 0;
+	for (i = 0; i < num_hw; i++) {
+		ab = ag->ab[device_id];
 
-	for (i = 0; i < ath12k_get_num_hw(ab); i++) {
 		for (j = 0; j < radio_per_hw; j++) {
 			pdev_map[j].ab = ab;
 			pdev_map[j].pdev_idx = (i * radio_per_hw) + j;
@@ -9021,11 +9048,19 @@ int ath12k_mac_allocate(struct ath12k_base *ab)
 			goto err;
 		}
 
-		ath12k_ab_set_ah(ab, i, ah);
+		mac_id++;
+		/* If mac_id falls beyond the current device MACs then
+		 * move to next device
+		 */
+		if (mac_id >= ab->num_radios) {
+			device_id++;
+			mac_id = 0;
+			ath12k_set_device_defaults(ab);
+		}
+		ag->ah[i] = ah;
+		ag->num_hw++;
 	}
 
-	ath12k_dp_pdev_pre_alloc(ab);
-
 	return 0;
 
 err:
diff --git a/drivers/net/wireless/ath/ath12k/mac.h b/drivers/net/wireless/ath/ath12k/mac.h
index 69fd282b9dd3..f0ea0b5f50e4 100644
--- a/drivers/net/wireless/ath/ath12k/mac.h
+++ b/drivers/net/wireless/ath/ath12k/mac.h
@@ -13,6 +13,7 @@
 struct ath12k;
 struct ath12k_base;
 struct ath12k_hw;
+struct ath12k_hw_group;
 struct ath12k_pdev_map;
 
 struct ath12k_generic_iter {
@@ -50,10 +51,10 @@ enum ath12k_supported_bw {
 
 extern const struct htt_rx_ring_tlv_filter ath12k_mac_mon_status_filter_default;
 
-void ath12k_mac_destroy(struct ath12k_base *ab);
-void ath12k_mac_unregister(struct ath12k_base *ab);
-int ath12k_mac_register(struct ath12k_base *ab);
-int ath12k_mac_allocate(struct ath12k_base *ab);
+void ath12k_mac_destroy(struct ath12k_hw_group *ag);
+void ath12k_mac_unregister(struct ath12k_hw_group *ag);
+int ath12k_mac_register(struct ath12k_hw_group *ag);
+int ath12k_mac_allocate(struct ath12k_hw_group *ag);
 int ath12k_mac_hw_ratecode_to_legacy_rate(u8 hw_rc, u8 preamble, u8 *rateidx,
 					  u16 *rate);
 u8 ath12k_mac_bitrate_to_idx(const struct ieee80211_supported_band *sband,
-- 
2.34.1