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Mon, 02 Nov 2026 00:31:29 -0800 (PST) Received: from hu-vkatoch-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8aad9d03be0sm1674680b3a.27.2026.11.02.00.31.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Nov 2026 00:31:29 -0800 (PST) From: Vinayak Katoch Date: Mon, 02 Nov 2026 14:01:03 +0530 Subject: [PATCH v7 2/3] misc: fastrpc: move ADSP duplicate session creation to the driver X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261102-dup-sessions-v7-2-03f06c014e78@oss.qualcomm.com> References: <20261102-dup-sessions-v7-0-03f06c014e78@oss.qualcomm.com> In-Reply-To: <20261102-dup-sessions-v7-0-03f06c014e78@oss.qualcomm.com> To: Srinivas Kandagatla , Amol Maheshwari , Arnd Bergmann , Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Ekansh Gupta Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Bharath Kumar , Chenna Kesava Raju , devicetree@vger.kernel.org, Vinayak Katoch X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; 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Each CB supports a single session, which means only a few processes can run on ADSP simultaneously. If all sessions are consumed by fastrpc daemons, no session remains available when a user application starts, causing the application to fail. To work around this, qcom,nsessions = <5> was set in DT to duplicate sessions inline during fastrpc_cb_init(). This policy does not belong in DT and should be handled at the driver level instead. Remove the qcom,nsessions DT property read and the per-CB duplication logic from fastrpc_cb_init(). After all context banks have been initialised in fastrpc_rpmsg_probe(), append FASTRPC_DUP_SESSIONS (4) copies of the last successfully initialised session for the ADSP domain. Signed-off-by: Vinayak Katoch --- drivers/misc/fastrpc.c | 33 +++++++++++++++++++++------------ 1 file changed, 21 insertions(+), 12 deletions(-) diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index 7441e9b8940d..b4be0ee2bc18 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -35,6 +35,11 @@ #define CDSP_DOMAIN_ID (3) #define GDSP_DOMAIN_ID (4) #define FASTRPC_MAX_SESSIONS 14 +/* + * Extra ADSP sessions duplicated from the last CB, as each CB supports + * only one session. + */ +#define FASTRPC_DUP_SESSIONS 4 #define FASTRPC_MAX_VMIDS 16 #define FASTRPC_ALIGN 128 #define FASTRPC_MAX_FDLIST 16 @@ -2339,7 +2344,6 @@ static int fastrpc_cb_init(struct platform_device *pdev) struct fastrpc_channel_ctx *cctx; struct fastrpc_session_ctx *sess; struct device *dev = &pdev->dev; - int i, sessions = 0; unsigned long flags; u32 dma_bits; u32 sid = 0; @@ -2349,7 +2353,6 @@ static int fastrpc_cb_init(struct platform_device *pdev) if (!cctx) return -EINVAL; - of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions); if (of_property_read_u32(dev->of_node, "reg", &sid)) dev_info(dev, "FastRPC Session ID not specified in DT\n"); @@ -2369,16 +2372,6 @@ static int fastrpc_cb_init(struct platform_device *pdev) if (cctx->domain_id == CDSP_DOMAIN_ID) dma_bits = cctx->soc_data->dma_addr_bits_cdsp; - if (sessions > 0) { - struct fastrpc_session_ctx *dup_sess; - - for (i = 1; i < sessions; i++) { - if (cctx->sesscount >= FASTRPC_MAX_SESSIONS) - break; - dup_sess = &cctx->session[cctx->sesscount++]; - memcpy(dup_sess, sess, sizeof(*dup_sess)); - } - } spin_unlock_irqrestore(&cctx->lock, flags); rc = dma_set_mask(dev, DMA_BIT_MASK(dma_bits)); if (rc) { @@ -2681,6 +2674,22 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev) if (err) goto err_deregister_fdev; + if (data->domain_id == ADSP_DOMAIN_ID && data->sesscount > 0) { + struct fastrpc_session_ctx *last_sess; + struct fastrpc_session_ctx *dup_sess; + unsigned long flags; + + spin_lock_irqsave(&data->lock, flags); + last_sess = &data->session[data->sesscount - 1]; + for (i = 0; i < FASTRPC_DUP_SESSIONS; i++) { + if (data->sesscount >= FASTRPC_MAX_SESSIONS) + break; + dup_sess = &data->session[data->sesscount++]; + memcpy(dup_sess, last_sess, sizeof(*dup_sess)); + } + spin_unlock_irqrestore(&data->lock, flags); + } + return 0; err_deregister_fdev: -- 2.34.1