[{"id":3677347,"web_url":"http://patchwork.ozlabs.org/comment/3677347/","msgid":"<7cij7qnjnv5ntsfmjdyozywiiwnpcpzop6mr5comt6djlh2opx@qgxp77geszoe>","list_archive_url":null,"date":"2026-04-14T17:59:42","subject":"Re: [PATCH 3/3] misc: fastrpc: Use context device bus for compute\n banks","submitter":{"id":90483,"url":"http://patchwork.ozlabs.org/api/people/90483/","name":"Dmitry Baryshkov","email":"dmitry.baryshkov@oss.qualcomm.com"},"content":"On Tue, Apr 14, 2026 at 10:01:17PM +0530, Ekansh Gupta via B4 Relay wrote:\n> From: Ekansh Gupta \n> \n> Replace the platform driver approach for compute bank (CB) devices\n> with the generic context_device_bus_type. Compute bank devices are\n> synthetic IOMMU context banks, not real platform devices, so using\n> the context device bus provides a more accurate representation in\n> the device model.\n> \n> Currently, fastrpc used of_platform_populate() to create platform\n> devices for each \"qcom,fastrpc-compute-cb\" DT node, with a platform\n> driver (fastrpc_cb_driver) to handle probe/remove. This approach\n> had a race condition: device nodes were created before channel\n> resources (like spin_lock) were initialized, and probe was async,\n> so applications could open the device before sessions were available.\n> \n> This patch addresses the race by manually creating and configuring\n> CB devices synchronously during fastrpc_rpmsg_probe(), after all\n> channel resources are initialized. The approach follows the pattern\n> used in host1x_memory_context_list_init().\n> \n> Signed-off-by: Ekansh Gupta \n> ---\n> drivers/misc/Kconfig | 1 +\n> drivers/misc/fastrpc.c | 180 ++++++++++++++++++++++++++++++++++---------------\n> 2 files changed, 125 insertions(+), 56 deletions(-)\n> \n> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig\n> index 00683bf06258..b501462a4548 100644\n> --- a/drivers/misc/Kconfig\n> +++ b/drivers/misc/Kconfig\n> @@ -304,6 +304,7 @@ config QCOM_FASTRPC\n> \tdepends on RPMSG\n> \tselect DMA_SHARED_BUFFER\n> \tselect QCOM_SCM\n> +\tselect CONTEXT_DEVICE_BUS\n> \thelp\n> \t Provides a communication mechanism that allows for clients to\n> \t make remote method invocations across processor boundary to\n> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c\n> index 1080f9acf70a..f66fd3eea5fa 100644\n> --- a/drivers/misc/fastrpc.c\n> +++ b/drivers/misc/fastrpc.c\n> @@ -13,9 +13,9 @@\n> #include \n> #include \n> #include \n> -#include \n> +#include \n> #include \n> -#include \n> +#include \n> #include \n> #include \n> #include \n> @@ -250,6 +250,18 @@ struct fastrpc_invoke_ctx {\n> \tstruct fastrpc_channel_ctx *cctx;\n> };\n> \n> +/**\n> + * struct fastrpc_cb_device - Compute bank device wrapper\n> + * @dev: Device structure\n> + * @sess: Back-pointer to the session context\n> + */\n> +struct fastrpc_cb_device {\n> +\tstruct device dev;\n> +\tstruct fastrpc_session_ctx *sess;\n> +};\n> +\n> +#define to_fastrpc_cb_device(d) container_of(d, struct fastrpc_cb_device, dev)\n> +\n> struct fastrpc_session_ctx {\n> \tstruct device *dev;\n> \tint sid;\n> @@ -2190,92 +2202,156 @@ static const struct file_operations fastrpc_fops = {\n> \t.compat_ioctl = fastrpc_device_ioctl,\n> };\n> \n> -static int fastrpc_cb_probe(struct platform_device *pdev)\n> +static void fastrpc_cb_dev_release(struct device *dev)\n> +{\n> +\tstruct fastrpc_cb_device *cb_dev = to_fastrpc_cb_device(dev);\n> +\n> +\tof_node_put(dev->of_node);\n> +\tkfree(cb_dev);\n> +}\n> +\n> +static int fastrpc_create_cb_device(struct fastrpc_channel_ctx *cctx,\n> +\t\t\t\t struct device *parent,\n> +\t\t\t\t struct device_node *cb_node)\n> {\n> -\tstruct fastrpc_channel_ctx *cctx;\n> \tstruct fastrpc_session_ctx *sess;\n> -\tstruct device *dev = &pdev->dev;\n> -\tint i, sessions = 0;\n> +\tstruct fastrpc_cb_device *cb_dev;\n> \tunsigned long flags;\n> -\tint rc;\n> -\tu32 dma_bits;\n> -\n> -\tcctx = dev_get_drvdata(dev->parent);\n> -\tif (!cctx)\n> -\t\treturn -EINVAL;\n> +\tint i, sessions = 0, rc;\n> +\tu32 dma_bits, sid = 0;\n> \n> -\tof_property_read_u32(dev->of_node, \"qcom,nsessions\", &sessions);\n> +\t/* Read SID early so it can be used in the device name */\n> +\tof_property_read_u32(cb_node, \"reg\", &sid);\n> +\tof_property_read_u32(cb_node, \"qcom,nsessions\", &sessions);\n> \n> \tspin_lock_irqsave(&cctx->lock, flags);\n> \tif (cctx->sesscount >= FASTRPC_MAX_SESSIONS) {\n> -\t\tdev_err(&pdev->dev, \"too many sessions\\n\");\n> +\t\tdev_err(parent, \"too many sessions\\n\");\n> \t\tspin_unlock_irqrestore(&cctx->lock, flags);\n> \t\treturn -ENOSPC;\n> \t}\n> \tdma_bits = cctx->soc_data->dma_addr_bits_default;\n> +\tif (cctx->domain_id == CDSP_DOMAIN_ID)\n> +\t\tdma_bits = cctx->soc_data->dma_addr_bits_cdsp;\n> +\n> \tsess = &cctx->session[cctx->sesscount++];\n> \tsess->used = false;\n> \tsess->valid = true;\n> -\tsess->dev = dev;\n> -\tdev_set_drvdata(dev, sess);\n> +\tsess->sid = sid;\n> +\tspin_unlock_irqrestore(&cctx->lock, flags);\n> \n> -\tif (cctx->domain_id == CDSP_DOMAIN_ID)\n> -\t\tdma_bits = cctx->soc_data->dma_addr_bits_cdsp;\n> +\tcb_dev = kzalloc_obj(*cb_dev);\n> +\tif (!cb_dev)\n> +\t\treturn -ENOMEM;\n> \n> -\tif (of_property_read_u32(dev->of_node, \"reg\", &sess->sid))\n> -\t\tdev_info(dev, \"FastRPC Session ID not specified in DT\\n\");\n> +\tcb_dev->sess = sess;\n> \n> -\tif (sessions > 0) {\n> -\t\tstruct fastrpc_session_ctx *dup_sess;\n> +\tdevice_initialize(&cb_dev->dev);\n> +\tcb_dev->dev.parent = parent;\n> +\tcb_dev->dev.bus = &context_device_bus_type;\n> +\tcb_dev->dev.release = fastrpc_cb_dev_release;\n> +\tcb_dev->dev.of_node = of_node_get(cb_node);\n> +\tcb_dev->dev.dma_mask = &cb_dev->dev.coherent_dma_mask;\n> +\tcb_dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);\n> +\tdev_set_name(&cb_dev->dev, \"%s:compute-cb@%u\", dev_name(parent), sid);\n\nPlease extract this code to a helper function inside the context bus and\nuse it for both host1x and fastrpc.\n\n> \n> +\trc = device_add(&cb_dev->dev);\n> +\tif (rc) {\n> +\t\tdev_err(parent, \"failed to add CB device: %d\\n\", rc);\n> +\t\tgoto err_put;\n> +\t}\n> +\n> +\trc = of_dma_configure(&cb_dev->dev, cb_node, true);\n> +\tif (rc) {\n> +\t\tdev_err(parent, \"of_dma_configure failed for CB device: %d\\n\", rc);\n> +\t\tgoto err_del;\n> +\t}\n> +\n> +\trc = dma_set_mask(&cb_dev->dev, DMA_BIT_MASK(dma_bits));\n> +\tif (rc) {\n> +\t\tdev_err(parent, \"%u-bit DMA enable failed\\n\", dma_bits);\n> +\t\tgoto err_del;\n> +\t}\n> +\n> +\tsess->dev = &cb_dev->dev;\n> +\n> +\tif (sessions > 0) {\n> +\t\tspin_lock_irqsave(&cctx->lock, flags);\n> \t\tfor (i = 1; i < sessions; i++) {\n> +\t\t\tstruct fastrpc_session_ctx *dup_sess;\n> +\n> \t\t\tif (cctx->sesscount >= FASTRPC_MAX_SESSIONS)\n> \t\t\t\tbreak;\n> \t\t\tdup_sess = &cctx->session[cctx->sesscount++];\n> \t\t\tmemcpy(dup_sess, sess, sizeof(*dup_sess));\n> \t\t}\n> -\t}\n> -\tspin_unlock_irqrestore(&cctx->lock, flags);\n> -\trc = dma_set_mask(dev, DMA_BIT_MASK(dma_bits));\n> -\tif (rc) {\n> -\t\tdev_err(dev, \"%u-bit DMA enable failed\\n\", dma_bits);\n> -\t\treturn rc;\n> +\t\tspin_unlock_irqrestore(&cctx->lock, flags);\n> \t}\n> \n> \treturn 0;\n> +\n> +err_del:\n> +\tdevice_del(&cb_dev->dev);\n> +err_put:\n> +\tof_node_put(cb_dev->dev.of_node);\n> +\tput_device(&cb_dev->dev);\n> +\treturn rc;\n> }\n> \n> -static void fastrpc_cb_remove(struct platform_device *pdev)\n> +static void fastrpc_depopulate_cb_devices(struct fastrpc_channel_ctx *cctx)\n> {\n> -\tstruct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent);\n> -\tstruct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev);\n> \tunsigned long flags;\n> -\tint i;\n> +\tint i, j;\n> \n> \tspin_lock_irqsave(&cctx->lock, flags);\n> \tfor (i = 0; i < FASTRPC_MAX_SESSIONS; i++) {\n> -\t\tif (cctx->session[i].sid == sess->sid) {\n> +\t\tif (cctx->session[i].valid) {\n> \t\t\tcctx->session[i].valid = false;\n> \t\t\tcctx->sesscount--;\n> \t\t}\n> \t}\n> \tspin_unlock_irqrestore(&cctx->lock, flags);\n> +\n> +\tfor (i = 0; i < FASTRPC_MAX_SESSIONS; i++) {\n> +\t\tstruct device *dev = cctx->session[i].dev;\n> +\n> +\t\tif (!dev)\n> +\t\t\tcontinue;\n> +\n> +\t\t/* Unregister the device once */\n> +\t\tdevice_unregister(dev);\n> +\n> +\t\t/* Clear this dev pointer from all sessions that share it */\n> +\t\tfor (j = i; j < FASTRPC_MAX_SESSIONS; j++) {\n> +\t\t\tif (cctx->session[j].dev == dev)\n> +\t\t\t\tcctx->session[j].dev = NULL;\n> +\t\t}\n> +\t}\n> }\n> \n> -static const struct of_device_id fastrpc_match_table[] = {\n> -\t{ .compatible = \"qcom,fastrpc-compute-cb\", },\n> -\t{}\n> -};\n> +static int fastrpc_populate_cb_devices(struct fastrpc_channel_ctx *cctx,\n> +\t\t\t\t\tstruct device *parent,\n> +\t\t\t\t\tstruct device_node *parent_node)\n> +{\n> +\tstruct device_node *child;\n> +\tint ret = 0;\n> \n> -static struct platform_driver fastrpc_cb_driver = {\n> -\t.probe = fastrpc_cb_probe,\n> -\t.remove = fastrpc_cb_remove,\n> -\t.driver = {\n> -\t\t.name = \"qcom,fastrpc-cb\",\n> -\t\t.of_match_table = fastrpc_match_table,\n> -\t\t.suppress_bind_attrs = true,\n> -\t},\n> -};\n> +\tfor_each_child_of_node(parent_node, child) {\n> +\t\tif (!of_device_is_compatible(child, \"qcom,fastrpc-compute-cb\"))\n> +\t\t\tcontinue;\n> +\n> +\t\tret = fastrpc_create_cb_device(cctx, parent, child);\n> +\t\tif (ret) {\n> +\t\t\tdev_err(parent, \"failed to create CB device for %s: %d\\n\",\n> +\t\t\t\tchild->name, ret);\n> +\t\t\tof_node_put(child);\n> +\t\t\tfastrpc_depopulate_cb_devices(cctx);\n> +\t\t\treturn ret;\n> +\t\t}\n> +\t}\n> +\n> +\treturn 0;\n> +}\n> \n> static int fastrpc_device_register(struct device *dev, struct fastrpc_channel_ctx *cctx,\n> \t\t\t\t bool is_secured, const char *domain)\n> @@ -2441,7 +2517,7 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)\n> \tdata->domain_id = domain_id;\n> \tdata->rpdev = rpdev;\n> \n> -\terr = of_platform_populate(rdev->of_node, NULL, NULL, rdev);\n> +\terr = fastrpc_populate_cb_devices(data, rdev, rdev->of_node);\n> \tif (err)\n> \t\tgoto err_deregister_fdev;\n> \n> @@ -2496,7 +2572,7 @@ static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)\n> \tif (cctx->remote_heap)\n> \t\tfastrpc_buf_free(cctx->remote_heap);\n> \n> -\tof_platform_depopulate(&rpdev->dev);\n> +\tfastrpc_depopulate_cb_devices(cctx);\n> \n> \tfastrpc_channel_ctx_put(cctx);\n> }\n> @@ -2558,16 +2634,9 @@ static int fastrpc_init(void)\n> {\n> \tint ret;\n> \n> -\tret = platform_driver_register(&fastrpc_cb_driver);\n> -\tif (ret < 0) {\n> -\t\tpr_err(\"fastrpc: failed to register cb driver\\n\");\n> -\t\treturn ret;\n> -\t}\n> -\n> \tret = register_rpmsg_driver(&fastrpc_driver);\n> \tif (ret < 0) {\n> \t\tpr_err(\"fastrpc: failed to register rpmsg driver\\n\");\n> -\t\tplatform_driver_unregister(&fastrpc_cb_driver);\n> \t\treturn ret;\n> \t}\n> \n> @@ -2577,7 +2646,6 @@ module_init(fastrpc_init);\n> \n> static void fastrpc_exit(void)\n> {\n> -\tplatform_driver_unregister(&fastrpc_cb_driver);\n> \tunregister_rpmsg_driver(&fastrpc_driver);\n> }\n> module_exit(fastrpc_exit);\n> \n> -- \n> 2.34.1\n> \n>","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-tegra@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 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Wysocki\" ,\n Danilo Krummrich ,\n Thierry Reding ,\n Mikko Perttunen ,\n David Airlie , Simona Vetter ,\n Joerg Roedel , Will Deacon ,\n Robin Murphy , Arnd Bergmann ,\n Srinivas Kandagatla ,\n Bharath Kumar ,\n Chenna Kesava Raju ,\n linux-kernel@vger.kernel.org, driver-core@lists.linux.dev,\n dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org,\n iommu@lists.linux.dev, linux-arm-msm@vger.kernel.org","Subject":"Re: [PATCH 3/3] misc: fastrpc: Use context device bus for compute\n banks","Message-ID":"<7cij7qnjnv5ntsfmjdyozywiiwnpcpzop6mr5comt6djlh2opx@qgxp77geszoe>","References":"<20260414-computebus-v1-0-4d904d40926a@oss.qualcomm.com>\n <20260414-computebus-v1-3-4d904d40926a@oss.qualcomm.com>","Precedence":"bulk","X-Mailing-List":"linux-tegra@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20260414-computebus-v1-3-4d904d40926a@oss.qualcomm.com>","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDE0MDE2NyBTYWx0ZWRfX+akWTdDQq6CN\n AMFGtw3XUeZIxiVZ07Ety2sls0l9gTEDY5NllETplw5kEjZq7/tj6ZCtzpwA1FgYLr94knzNO+V\n y0xlFFCFAIH4/15LflstWXswGgAVPcWdOKD5Uzy6ZoTZO7IzpKloYTtgCCmPxualRBOxSYhqT7d\n U6no3x9A1RbhYIc7zgBlQ+jjgH64IafBIkHIfzx0f3EFNCv9qkuz2uTRqgcu+x2o7XSDVaQrSo9\n cEqG4tSWLVYt0IBN7WXbD2r2VQbnqFXIBPlvd+BlrGav0fS6aoUw7uKycye2QBlDaKSXFmy7WzY\n lQPQJy1gBslDhMGggL2RHSH5GNXnfOzYw8yTSgLUXrHmktlPQtELsj7vAojaT3fb8dR1hKJYPp6\n 6PVdKIE5KHAEcvdAP9mhZKFmgVGDTRDXhdv9qQrfU7kIZ3123nZBflwP6itR+JiWC8sCbDygSia\n jKxF9XKdnUb+3SoGhTg==","X-Authority-Analysis":"v=2.4 cv=T5m8ifKQ c=1 sm=1 tr=0 ts=69de8092 cx=c_pps\n a=EVbN6Ke/fEF3bsl7X48z0g==:117 a=xqWC_Br6kY4A:10 a=kj9zAlcOel0A:10\n a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=EUspDBNiAAAA:8\n a=eP6CfP3hHy5NNNlF4cwA:9 a=CjuIK1q_8ugA:10 a=a_PwQJl-kcHnX1M80qC6:22","X-Proofpoint-GUID":"5Ywiho_9Lbh8i2ZdOi5Td85ZdCPeqt0J","X-Proofpoint-ORIG-GUID":"5Ywiho_9Lbh8i2ZdOi5Td85ZdCPeqt0J","X-Proofpoint-Virus-Version":"vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-14_03,2026-04-13_04,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=outbound_notspam policy=outbound score=0\n clxscore=1015 suspectscore=0 spamscore=0 priorityscore=1501 malwarescore=0\n impostorscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 adultscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604140167"}}]