Messages in this thread | | | Date | Thu, 29 Jun 2023 14:46:18 +0530 | Subject | Re: [PATCH v4 10/21] soc: qcom: Add qcom's pstore minidump driver support | From | Mukesh Ojha <> |
| |
On 6/29/2023 4:27 AM, Rob Herring wrote: > On Wed, Jun 28, 2023 at 6:37 AM Mukesh Ojha <quic_mojha@quicinc.com> wrote: >> >> This driver was inspired from the fact pstore ram region should be >> fixed and boot firmware need to have awarness about this region, >> so that it will be persistent across boot. But, there are many >> QCOM SoC which does not support warm boot from hardware but they >> have minidump support from the software, and for them, there is >> no need of this pstore ram region to be fixed, but at the same >> time have interest in the pstore frontends data. So, this driver >> get the dynamic reserved region from the ram and register the >> ramoops platform device. >> >> +---------+ +---------+ +--------+ +---------+ >> | console | | pmsg | | ftrace | | dmesg | >> +---------+ +---------+ +--------+ +---------+ >> | | | | >> | | | | >> +------------------------------------------+ >> | >> \ / >> +----------------+ >> (1) |pstore frontends| >> +----------------+ >> | >> \ / >> +------------------- + >> (2) | pstore backend(ram)| >> +--------------------+ >> | >> \ / >> +--------------------+ >> (3) |qcom_pstore_minidump| >> +--------------------+ >> | >> \ / >> +---------------+ >> (4) | qcom_minidump | >> +---------------+ >> >> This driver will route all the pstore front data to the stored >> in qcom pstore reserved region and the reason of showing an >> arrow from (3) to (4) as qcom_pstore_minidump driver will register >> all the available frontends region with qcom minidump driver >> in upcoming patch. >> >> Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com> >> --- >> drivers/soc/qcom/Kconfig | 12 +++++ >> drivers/soc/qcom/Makefile | 1 + >> drivers/soc/qcom/qcom_pstore_minidump.c | 85 +++++++++++++++++++++++++++++++++ > > drivers/soc/ is the dumping ground for things with no other place. As > this is a pstore driver, it belongs with pstore.
The inspiration of this driver was taken from drivers/platform/chrome/chromeos_pstore.c, do you think that is misplaced ?
> >> 3 files changed, 98 insertions(+) >> create mode 100644 drivers/soc/qcom/qcom_pstore_minidump.c >> >> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig >> index 1834213fd652..fbf08e30feda 100644 >> --- a/drivers/soc/qcom/Kconfig >> +++ b/drivers/soc/qcom/Kconfig >> @@ -306,4 +306,16 @@ config QCOM_MINIDUMP_SMEM >> >> This config should be enabled if the low level minidump is implemented >> as part of SMEM. >> + >> +config QCOM_PSTORE_MINIDUMP >> + tristate "Pstore support for QCOM Minidump" >> + depends on ARCH_QCOM >> + depends on PSTORE_RAM >> + depends on QCOM_MINIDUMP >> + help >> + Enablement of this driver ensures that ramoops region can be anywhere >> + reserved in ram instead of being fixed address which needs boot firmware >> + awareness. So, this driver creates plaform device and registers available >> + frontend region with the Qualcomm's minidump driver. >> + >> endmenu >> diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile >> index 737d868757ac..1ab59c1b364d 100644 >> --- a/drivers/soc/qcom/Makefile >> +++ b/drivers/soc/qcom/Makefile >> @@ -36,3 +36,4 @@ qcom_ice-objs += ice.o >> obj-$(CONFIG_QCOM_INLINE_CRYPTO_ENGINE) += qcom_ice.o >> obj-$(CONFIG_QCOM_MINIDUMP) += qcom_minidump.o >> obj-$(CONFIG_QCOM_MINIDUMP_SMEM) += qcom_minidump_smem.o >> +obj-$(CONFIG_QCOM_PSTORE_MINIDUMP) += qcom_pstore_minidump.o >> diff --git a/drivers/soc/qcom/qcom_pstore_minidump.c b/drivers/soc/qcom/qcom_pstore_minidump.c >> new file mode 100644 >> index 000000000000..b07cd10340df >> --- /dev/null >> +++ b/drivers/soc/qcom/qcom_pstore_minidump.c >> @@ -0,0 +1,85 @@ >> +// SPDX-License-Identifier: GPL-2.0-only >> + >> +/* >> + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved. >> + */ >> + >> +#include <linux/module.h> >> +#include <linux/of_device.h> > > You probably don't need this include. Use the actual includes you need > and don't rely on implicit includes (because I'm trying to remove > those).
Ok, will try to check..
- Mukesh
> >> +#include <linux/of_reserved_mem.h> >> +#include <linux/platform_device.h> >> +#include <linux/pstore_ram.h> >> + >> +struct qcom_ramoops_dd { >> + struct ramoops_platform_data qcom_ramoops_pdata; >> + struct platform_device *ramoops_pdev; >> +}; >> + >> +static int qcom_ramoops_probe(struct platform_device *pdev) >> +{ >> + struct device_node *of_node = pdev->dev.of_node; >> + struct qcom_ramoops_dd *qcom_rdd; >> + struct ramoops_platform_data *pdata; >> + struct reserved_mem *rmem; >> + struct device_node *node; >> + long ret; >> + >> + node = of_parse_phandle(of_node, "memory-region", 0); >> + if (!node) >> + return -ENODEV; >> + >> + rmem = of_reserved_mem_lookup(node); >> + of_node_put(node); >> + if (!rmem) { >> + dev_err(&pdev->dev, "failed to locate DT /reserved-memory resource\n"); >> + return -EINVAL; >> + } >> + >> + qcom_rdd = devm_kzalloc(&pdev->dev, sizeof(*qcom_rdd), GFP_KERNEL); >> + if (!qcom_rdd) >> + return -ENOMEM; >> + >> + pdata = &qcom_rdd->qcom_ramoops_pdata; >> + pdata->mem_size = rmem->size; >> + pdata->mem_address = rmem->base; >> + ramoops_parse_dt(pdev, pdata); >> + >> + qcom_rdd->ramoops_pdev = platform_device_register_data(NULL, "ramoops", -1, >> + pdata, sizeof(*pdata)); >> + if (IS_ERR(qcom_rdd->ramoops_pdev)) { >> + ret = PTR_ERR(qcom_rdd->ramoops_pdev); >> + dev_err(&pdev->dev, "could not create platform device: %ld\n", ret); >> + qcom_rdd->ramoops_pdev = NULL; >> + } >> + platform_set_drvdata(pdev, qcom_rdd); >> + >> + return ret; >> +} >> + >> +static void qcom_ramoops_remove(struct platform_device *pdev) >> +{ >> + struct qcom_ramoops_dd *qcom_rdd = platform_get_drvdata(pdev); >> + >> + platform_device_unregister(qcom_rdd->ramoops_pdev); >> + qcom_rdd->ramoops_pdev = NULL; >> +} >> + >> +static const struct of_device_id qcom_ramoops_of_match[] = { >> + { .compatible = "qcom,ramoops"}, >> + {} >> +}; >> +MODULE_DEVICE_TABLE(of, qcom_ramoops_of_match); >> + >> +static struct platform_driver qcom_ramoops_drv = { >> + .driver = { >> + .name = "qcom,ramoops", >> + .of_match_table = qcom_ramoops_of_match, >> + }, >> + .probe = qcom_ramoops_probe, >> + .remove_new = qcom_ramoops_remove, >> +}; >> + >> +module_platform_driver(qcom_ramoops_drv); >> + >> +MODULE_DESCRIPTION("Qualcomm ramoops minidump driver"); >> +MODULE_LICENSE("GPL"); >> -- >> 2.7.4 >>
| |