From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C702D2E0411; Tue, 8 Jul 2025 16:37:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751992638; cv=none; b=aHcEdk/UAZd4UbLGUU3NN2nkr/6678vQSgqAjx5mngyHGsky1L3PL9XEMLTsUJ1GZbyvnftvmwUyLzngQ55Kk5xa8NPA7CwbLi5wTAWtBGM1+pmM+KwlMye8qsSddHOTkGwFpCPmxpAoFPx3mGXQniWW9uMPuUMrRHpcpRhKJTs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751992638; c=relaxed/simple; bh=+0iqOl/mpfx8ff7YBc39jydO9U9C7qfoxUFN8HSX+cc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Q/DsYmqti8TCv/KrGAuv6zcFT8MqFIK1JKkUhcQXlj+GtkA7xMch6v758BT7rhMRMLBX9k8w/f6Nu224crl6GkiE9KGJamSC4W9xlBdvQEeUvT/Fi9KMnbSonLLCAD7Djtkrw/HTOqun8qWJzFGQAMLOsUeqkkxI31LC/7vNHUA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=D+9MosiV; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="D+9MosiV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 56672C4CEED; Tue, 8 Jul 2025 16:37:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1751992638; bh=+0iqOl/mpfx8ff7YBc39jydO9U9C7qfoxUFN8HSX+cc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D+9MosiV4LaTUsiuV32+WRv60F2ZLaN19ldEYIqPU/cMU8LG0jI71IpXs88LK7W+0 vBE3VLJySz3fo5pth7oThCe2jokDqcXLkenaEVNMXPsSY5/zUilj8QlSjw5bs3yzjt OaOoDkTyrL4XVY/z3TJQAE+T2lN1HHCte6LV+KIQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Viresh Kumar , Sudeep Holla , Sasha Levin Subject: [PATCH 6.12 029/232] firmware: arm_ffa: Add support for {un,}registration of framework notifications Date: Tue, 8 Jul 2025 18:20:25 +0200 Message-ID: <20250708162242.198209294@linuxfoundation.org> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250708162241.426806072@linuxfoundation.org> References: <20250708162241.426806072@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sudeep Holla [ Upstream commit c10debfe7f028c11f7a501a0f8e937c9be9e5327 ] Framework notifications are doorbells that are rung by the partition managers to signal common events to an endpoint. These doorbells cannot be rung by an endpoint directly. A partition manager can signal a Framework notification in response to an FF-A ABI invocation by an endpoint. Two additional notify_ops interface is being added for any FF-A device/ driver to register and unregister for such a framework notifications. Tested-by: Viresh Kumar Message-Id: <20250217-ffa_updates-v3-16-bd1d9de615e7@arm.com> Signed-off-by: Sudeep Holla Stable-dep-of: 27e850c88df0 ("firmware: arm_ffa: Move memory allocation outside the mutex locking") Signed-off-by: Sasha Levin --- drivers/firmware/arm_ffa/driver.c | 113 ++++++++++++++++++++++++------ include/linux/arm_ffa.h | 5 ++ 2 files changed, 97 insertions(+), 21 deletions(-) diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c index f0c7f417d7524..f19b142645cc5 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -1079,6 +1079,7 @@ static int ffa_memory_lend(struct ffa_mem_ops_args *args) struct notifier_cb_info { struct hlist_node hnode; struct ffa_device *dev; + ffa_fwk_notifier_cb fwk_cb; ffa_notifier_cb cb; void *cb_data; }; @@ -1142,28 +1143,61 @@ static enum notify_type ffa_notify_type_get(u16 vm_id) return NON_SECURE_VM; } -/* Should be called while the notify_lock is taken */ +/* notifier_hnode_get* should be called with notify_lock held */ static struct notifier_cb_info * -notifier_hash_node_get(u16 notify_id, enum notify_type type) +notifier_hnode_get_by_vmid(u16 notify_id, int vmid) { struct notifier_cb_info *node; hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id) - if (type == ffa_notify_type_get(node->dev->vm_id)) + if (node->fwk_cb && vmid == node->dev->vm_id) + return node; + + return NULL; +} + +static struct notifier_cb_info * +notifier_hnode_get_by_vmid_uuid(u16 notify_id, int vmid, const uuid_t *uuid) +{ + struct notifier_cb_info *node; + + if (uuid_is_null(uuid)) + return notifier_hnode_get_by_vmid(notify_id, vmid); + + hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id) + if (node->fwk_cb && vmid == node->dev->vm_id && + uuid_equal(&node->dev->uuid, uuid)) + return node; + + return NULL; +} + +static struct notifier_cb_info * +notifier_hnode_get_by_type(u16 notify_id, enum notify_type type) +{ + struct notifier_cb_info *node; + + hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id) + if (node->cb && type == ffa_notify_type_get(node->dev->vm_id)) return node; return NULL; } static int -update_notifier_cb(struct ffa_device *dev, int notify_id, ffa_notifier_cb cb, - void *cb_data, bool is_registration) +update_notifier_cb(struct ffa_device *dev, int notify_id, void *cb, + void *cb_data, bool is_registration, bool is_framework) { struct notifier_cb_info *cb_info = NULL; enum notify_type type = ffa_notify_type_get(dev->vm_id); bool cb_found; - cb_info = notifier_hash_node_get(notify_id, type); + if (is_framework) + cb_info = notifier_hnode_get_by_vmid_uuid(notify_id, dev->vm_id, + &dev->uuid); + else + cb_info = notifier_hnode_get_by_type(notify_id, type); + cb_found = !!cb_info; if (!(is_registration ^ cb_found)) @@ -1175,8 +1209,11 @@ update_notifier_cb(struct ffa_device *dev, int notify_id, ffa_notifier_cb cb, return -ENOMEM; cb_info->dev = dev; - cb_info->cb = cb; cb_info->cb_data = cb_data; + if (is_framework) + cb_info->fwk_cb = cb; + else + cb_info->cb = cb; hash_add(drv_info->notifier_hash, &cb_info->hnode, notify_id); } else { @@ -1187,7 +1224,8 @@ update_notifier_cb(struct ffa_device *dev, int notify_id, ffa_notifier_cb cb, return 0; } -static int ffa_notify_relinquish(struct ffa_device *dev, int notify_id) +static int __ffa_notify_relinquish(struct ffa_device *dev, int notify_id, + bool is_framework) { int rc; @@ -1199,22 +1237,35 @@ static int ffa_notify_relinquish(struct ffa_device *dev, int notify_id) mutex_lock(&drv_info->notify_lock); - rc = update_notifier_cb(dev, notify_id, NULL, NULL, false); + rc = update_notifier_cb(dev, notify_id, NULL, NULL, false, + is_framework); if (rc) { pr_err("Could not unregister notification callback\n"); mutex_unlock(&drv_info->notify_lock); return rc; } - rc = ffa_notification_unbind(dev->vm_id, BIT(notify_id)); + if (!is_framework) + rc = ffa_notification_unbind(dev->vm_id, BIT(notify_id)); mutex_unlock(&drv_info->notify_lock); return rc; } -static int ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu, - ffa_notifier_cb cb, void *cb_data, int notify_id) +static int ffa_notify_relinquish(struct ffa_device *dev, int notify_id) +{ + return __ffa_notify_relinquish(dev, notify_id, false); +} + +static int ffa_fwk_notify_relinquish(struct ffa_device *dev, int notify_id) +{ + return __ffa_notify_relinquish(dev, notify_id, true); +} + +static int __ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu, + void *cb, void *cb_data, + int notify_id, bool is_framework) { int rc; u32 flags = 0; @@ -1227,26 +1278,44 @@ static int ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu, mutex_lock(&drv_info->notify_lock); - if (is_per_vcpu) - flags = PER_VCPU_NOTIFICATION_FLAG; + if (!is_framework) { + if (is_per_vcpu) + flags = PER_VCPU_NOTIFICATION_FLAG; - rc = ffa_notification_bind(dev->vm_id, BIT(notify_id), flags); - if (rc) { - mutex_unlock(&drv_info->notify_lock); - return rc; + rc = ffa_notification_bind(dev->vm_id, BIT(notify_id), flags); + if (rc) { + mutex_unlock(&drv_info->notify_lock); + return rc; + } } - rc = update_notifier_cb(dev, notify_id, cb, cb_data, true); + rc = update_notifier_cb(dev, notify_id, cb, cb_data, true, + is_framework); if (rc) { pr_err("Failed to register callback for %d - %d\n", notify_id, rc); - ffa_notification_unbind(dev->vm_id, BIT(notify_id)); + if (!is_framework) + ffa_notification_unbind(dev->vm_id, BIT(notify_id)); } mutex_unlock(&drv_info->notify_lock); return rc; } +static int ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu, + ffa_notifier_cb cb, void *cb_data, int notify_id) +{ + return __ffa_notify_request(dev, is_per_vcpu, cb, cb_data, notify_id, + false); +} + +static int +ffa_fwk_notify_request(struct ffa_device *dev, ffa_fwk_notifier_cb cb, + void *cb_data, int notify_id) +{ + return __ffa_notify_request(dev, false, cb, cb_data, notify_id, true); +} + static int ffa_notify_send(struct ffa_device *dev, int notify_id, bool is_per_vcpu, u16 vcpu) { @@ -1276,7 +1345,7 @@ static void handle_notif_callbacks(u64 bitmap, enum notify_type type) continue; mutex_lock(&drv_info->notify_lock); - cb_info = notifier_hash_node_get(notify_id, type); + cb_info = notifier_hnode_get_by_type(notify_id, type); mutex_unlock(&drv_info->notify_lock); if (cb_info && cb_info->cb) @@ -1349,6 +1418,8 @@ static const struct ffa_notifier_ops ffa_drv_notifier_ops = { .sched_recv_cb_unregister = ffa_sched_recv_cb_unregister, .notify_request = ffa_notify_request, .notify_relinquish = ffa_notify_relinquish, + .fwk_notify_request = ffa_fwk_notify_request, + .fwk_notify_relinquish = ffa_fwk_notify_relinquish, .notify_send = ffa_notify_send, }; diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h index 74169dd0f6594..5e2530f23b793 100644 --- a/include/linux/arm_ffa.h +++ b/include/linux/arm_ffa.h @@ -455,6 +455,7 @@ struct ffa_cpu_ops { typedef void (*ffa_sched_recv_cb)(u16 vcpu, bool is_per_vcpu, void *cb_data); typedef void (*ffa_notifier_cb)(int notify_id, void *cb_data); +typedef void (*ffa_fwk_notifier_cb)(int notify_id, void *cb_data, void *buf); struct ffa_notifier_ops { int (*sched_recv_cb_register)(struct ffa_device *dev, @@ -463,6 +464,10 @@ struct ffa_notifier_ops { int (*notify_request)(struct ffa_device *dev, bool per_vcpu, ffa_notifier_cb cb, void *cb_data, int notify_id); int (*notify_relinquish)(struct ffa_device *dev, int notify_id); + int (*fwk_notify_request)(struct ffa_device *dev, + ffa_fwk_notifier_cb cb, void *cb_data, + int notify_id); + int (*fwk_notify_relinquish)(struct ffa_device *dev, int notify_id); int (*notify_send)(struct ffa_device *dev, int notify_id, bool per_vcpu, u16 vcpu); }; -- 2.39.5