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Mon, 28 Oct 2024 14:08:51 GMT Received: from [169.254.0.1] (10.49.16.6) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Mon, 28 Oct 2024 07:08:50 -0700 From: Jeff Johnson Date: Mon, 28 Oct 2024 07:08:40 -0700 Subject: [PATCH] wifi: ath12k: mark QMI driver event helpers as noinline Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20241028-ath12k_qmi_driver_event_work-v1-1-0d532eb593fa@quicinc.com> X-B4-Tracking: v=1; b=H4sIAOeaH2cC/42O0Q6CIBiFX8VxHU2Q1LrqPZpjCH/xzwkJRjXnu 4c+QZffds53zkIiBIRILsVCAiSM6F0GdiiItso9gKLJTHjJBSv5iarZMj7IaURpAiYIEhK4Wb5 9GCioc1NWWghlGpIVzwB3/Oz6W5e5VxFoH5TTdpNmFx0Vui1qMc4+fPcjiW2FPzcTo4y2fV3xl rO2NuI6vVCj00ftR9Kt6/oDzFJSGeUAAAA= To: , Kalle Valo , Jeff Johnson , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Arnd Bergmann CC: , , , , Jeff Johnson X-Mailer: b4 0.14.0 X-ClientProxiedBy: nalasex01c.na.qualcomm.com (10.47.97.35) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: lCpZeS_j_RfWys6-w64f4zA4uqEA4Ei4 X-Proofpoint-GUID: lCpZeS_j_RfWys6-w64f4zA4uqEA4Ei4 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 bulkscore=0 adultscore=0 clxscore=1011 impostorscore=0 malwarescore=0 priorityscore=1501 phishscore=0 mlxscore=0 suspectscore=0 mlxlogscore=999 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410280113 As described in [1], compiling the ath12k driver using clang with KASAN enabled warns about some functions with excessive stack usage, with the worst case being: drivers/net/wireless/ath/ath12k/qmi.c:3546:13: warning: stack frame size (2456) exceeds limit (1024) in 'ath12k_qmi_driver_event_work' [-Wframe-larger-than] Nathan [2] highlighted work done by Arnd [3] to address similar issues in other portions of the kernel. ath12k_qmi_driver_event_work() itself is a pretty lightweight function, but it dispatches to several other functions which do the real work: ath12k_qmi_driver_event_work() ath12k_qmi_event_server_arrive() ath12k_qmi_host_cap_send() ath12k_qmi_event_mem_request() ath12k_qmi_respond_fw_mem_request() ath12k_qmi_event_load_bdf() ath12k_qmi_request_target_cap() ath12k_qmi_load_bdf_qmi() ath12k_qmi_wlanfw_m3_info_send() Mark all of those underlying functions as 'noinline_for_stack' to prevent them from being inlined in ath12k_qmi_driver_event_work(), thereby eliminating the excessive stack usage. Link: https://msgid.link/bc214795-1c51-4cb7-922f-67d6ef98bff2@quicinc.com # [1] Link: https://msgid.link/20241025223321.GA3647469@thelio-3990X # [2] Link: https://lore.kernel.org/all/?q=f:arnd@kernel.org+Wframe-larger-than # [3] Signed-off-by: Jeff Johnson --- drivers/net/wireless/ath/ath12k/qmi.c | 34 +++++++++++++++++++++++++--------- 1 file changed, 25 insertions(+), 9 deletions(-) --- base-commit: 8a58dcd8db9c7af1187f0236d71a99cbbe146f6a change-id: 20241025-ath12k_qmi_driver_event_work-ea9703c44ad7 diff --git a/drivers/net/wireless/ath/ath12k/qmi.c b/drivers/net/wireless/ath/ath12k/qmi.c index b93ce9f87f61..d2d9d03c7a28 100644 --- a/drivers/net/wireless/ath/ath12k/qmi.c +++ b/drivers/net/wireless/ath/ath12k/qmi.c @@ -2066,7 +2066,9 @@ static void ath12k_host_cap_parse_mlo(struct ath12k_base *ab, req->mlo_chip_info_valid = 1; } -static int ath12k_qmi_host_cap_send(struct ath12k_base *ab) +/* clang stack usage explodes if this is inlined */ +static noinline_for_stack +int ath12k_qmi_host_cap_send(struct ath12k_base *ab) { struct qmi_wlanfw_host_cap_req_msg_v01 req = {}; struct qmi_wlanfw_host_cap_resp_msg_v01 resp = {}; @@ -2275,7 +2277,9 @@ static int ath12k_qmi_fw_ind_register_send(struct ath12k_base *ab) return ret; } -static int ath12k_qmi_respond_fw_mem_request(struct ath12k_base *ab) +/* clang stack usage explodes if this is inlined */ +static noinline_for_stack +int ath12k_qmi_respond_fw_mem_request(struct ath12k_base *ab) { struct qmi_wlanfw_respond_mem_req_msg_v01 *req; struct qmi_wlanfw_respond_mem_resp_msg_v01 resp = {}; @@ -2433,7 +2437,9 @@ static int ath12k_qmi_alloc_target_mem_chunk(struct ath12k_base *ab) return 0; } -static int ath12k_qmi_request_target_cap(struct ath12k_base *ab) +/* clang stack usage explodes if this is inlined */ +static noinline_for_stack +int ath12k_qmi_request_target_cap(struct ath12k_base *ab) { struct qmi_wlanfw_cap_req_msg_v01 req = {}; struct qmi_wlanfw_cap_resp_msg_v01 resp = {}; @@ -2619,8 +2625,10 @@ static int ath12k_qmi_load_file_target_mem(struct ath12k_base *ab, return ret; } -static int ath12k_qmi_load_bdf_qmi(struct ath12k_base *ab, - enum ath12k_qmi_bdf_type type) +/* clang stack usage explodes if this is inlined */ +static noinline_for_stack +int ath12k_qmi_load_bdf_qmi(struct ath12k_base *ab, + enum ath12k_qmi_bdf_type type) { struct device *dev = ab->dev; char filename[ATH12K_QMI_MAX_BDF_FILE_NAME_SIZE]; @@ -2791,7 +2799,9 @@ static int ath12k_qmi_m3_load(struct ath12k_base *ab) return ret; } -static int ath12k_qmi_wlanfw_m3_info_send(struct ath12k_base *ab) +/* clang stack usage explodes if this is inlined */ +static noinline_for_stack +int ath12k_qmi_wlanfw_m3_info_send(struct ath12k_base *ab) { struct m3_mem_region *m3_mem = &ab->qmi.m3_mem; struct qmi_wlanfw_m3_info_req_msg_v01 req = {}; @@ -3079,7 +3089,9 @@ ath12k_qmi_driver_event_post(struct ath12k_qmi *qmi, return 0; } -static int ath12k_qmi_event_server_arrive(struct ath12k_qmi *qmi) +/* clang stack usage explodes if this is inlined */ +static noinline_for_stack +int ath12k_qmi_event_server_arrive(struct ath12k_qmi *qmi) { struct ath12k_base *ab = qmi->ab; int ret; @@ -3101,7 +3113,9 @@ static int ath12k_qmi_event_server_arrive(struct ath12k_qmi *qmi) return ret; } -static int ath12k_qmi_event_mem_request(struct ath12k_qmi *qmi) +/* clang stack usage explodes if this is inlined */ +static noinline_for_stack +int ath12k_qmi_event_mem_request(struct ath12k_qmi *qmi) { struct ath12k_base *ab = qmi->ab; int ret; @@ -3115,7 +3129,9 @@ static int ath12k_qmi_event_mem_request(struct ath12k_qmi *qmi) return ret; } -static int ath12k_qmi_event_load_bdf(struct ath12k_qmi *qmi) +/* clang stack usage explodes if this is inlined */ +static noinline_for_stack +int ath12k_qmi_event_load_bdf(struct ath12k_qmi *qmi) { struct ath12k_base *ab = qmi->ab; int ret;