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[35.81.238.112]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e5ad25cb6dsm4836169a91.1.2024.10.21.21.17.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Oct 2024 21:17:15 -0700 (PDT) From: Bjorn Andersson Date: Tue, 22 Oct 2024 04:17:12 +0000 Subject: [PATCH 2/2] soc: qcom: pmic_glink: Handle GLINK intent allocation rejections Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241022-pmic-glink-ecancelled-v1-2-9e26fc74e0a3@oss.qualcomm.com> References: <20241022-pmic-glink-ecancelled-v1-0-9e26fc74e0a3@oss.qualcomm.com> In-Reply-To: <20241022-pmic-glink-ecancelled-v1-0-9e26fc74e0a3@oss.qualcomm.com> To: Bjorn Andersson , Mathieu Poirier , Chris Lew , Konrad Dybcio , Johan Hovold Cc: linux-arm-msm@vger.kernel.org, Bjorn Andersson , linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, Bjorn Andersson , stable@vger.kernel.org X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1729570634; l=2629; i=bjorn.andersson@oss.qualcomm.com; s=20241022; h=from:subject:message-id; bh=/58otU+mAPd8jrtLUJ/LEJCMOq0Y8R9ln/E00PBpe04=; b=M6z9243vFSnt4Z0ApB6ZfscKtvvptNe5YFen5SppKT1aQOu4RImpegyQ4k25IyQz4rf6KNRxa /ZYKK2MuDGuBQtLSHVdzPZBR1b3v+3HaMrrStXFySAM+BSkjyplaLIP X-Developer-Key: i=bjorn.andersson@oss.qualcomm.com; a=ed25519; pk=SAhIzN2NcG7kdNPq3QMED+Agjgc2IyfGAldevLwbJnU= X-Proofpoint-ORIG-GUID: e4XlYLSiUze7Gr8jv9n_f945HZlk1sS2 X-Proofpoint-GUID: e4XlYLSiUze7Gr8jv9n_f945HZlk1sS2 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 malwarescore=0 phishscore=0 mlxlogscore=999 bulkscore=0 spamscore=0 mlxscore=0 clxscore=1015 suspectscore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410220026 Some versions of the pmic_glink firmware does not allow dynamic GLINK intent allocations, attempting to send a message before the firmware has allocated its receive buffers and announced these intent allocations will fail. When this happens something like this showns up in the log: [ 9.799719] pmic_glink_altmode.pmic_glink_altmode pmic_glink.altmode.0:= failed to send altmode request: 0x10 (-125) [ 9.812446] pmic_glink_altmode.pmic_glink_altmode pmic_glink.altmode.0:= failed to request altmode notifications: -125 [ 9.831796] ucsi_glink.pmic_glink_ucsi pmic_glink.ucsi.0: failed to sen= d UCSI read request: -125 GLINK has been updated to distinguish between the cases where the remote is going down (-ECANCELLED) and the intent allocation being rejected (-EAGAIN). Retry the send until intent buffers becomes available, or an actual error occur. To avoid infinitely waiting for the firmware in the event that this misbehaves and no intents arrive, an arbitrary 10 second timeout is used. This patch was developed with input from Chris Lew. Reported-by: Johan Hovold Closes: https://lore.kernel.org/all/Zqet8iInnDhnxkT9@hovoldconsulting.com/#t Cc: stable@vger.kernel.org Signed-off-by: Bjorn Andersson Reviewed-by: Johan Hovold Tested-by: Johan Hovold --- drivers/soc/qcom/pmic_glink.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/soc/qcom/pmic_glink.c b/drivers/soc/qcom/pmic_glink.c index 9606222993fd78e80d776ea299cad024a0197e91..221639f3da149da1f967dbc769a= 97d327ffd6c63 100644 --- a/drivers/soc/qcom/pmic_glink.c +++ b/drivers/soc/qcom/pmic_glink.c @@ -13,6 +13,8 @@ #include #include =20 +#define PMIC_GLINK_SEND_TIMEOUT (10*HZ) + enum { PMIC_GLINK_CLIENT_BATT =3D 0, PMIC_GLINK_CLIENT_ALTMODE, @@ -112,13 +114,23 @@ EXPORT_SYMBOL_GPL(pmic_glink_client_register); int pmic_glink_send(struct pmic_glink_client *client, void *data, size_t l= en) { struct pmic_glink *pg =3D client->pg; + unsigned long start; + bool timeout_reached =3D false; int ret; =20 mutex_lock(&pg->state_lock); - if (!pg->ept) + if (!pg->ept) { ret =3D -ECONNRESET; - else - ret =3D rpmsg_send(pg->ept, data, len); + } else { + start =3D jiffies; + do { + timeout_reached =3D time_after(jiffies, start + PMIC_GLINK_SEND_TIMEOUT= ); + ret =3D rpmsg_send(pg->ept, data, len); + } while (ret =3D=3D -EAGAIN && !timeout_reached); + + if (ret =3D=3D -EAGAIN && timeout_reached) + ret =3D -ETIMEDOUT; + } mutex_unlock(&pg->state_lock); =20 return ret; --=20 2.43.0