Currently on Qualcomm SoC, download_mode is enabled if CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT is selected or passed a boolean value from command line. Refactor the code such that it supports multiple download modes and drop CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT config instead, give interface to set the download mode from module parameter while being backword compatible at the same time. Signed-off-by: Mukesh Ojha <quic_mojha@xxxxxxxxxxx> --- Change in v8: https://lore.kernel.org/lkml/20240109153200.12848-12-quic_mojha@xxxxxxxxxxx/ - Rebased it on top of https://lore.kernel.org/lkml/20240708155332.4056479-1-quic_mojha@xxxxxxxxxxx/ - Sending them separately as they are not dependent on kernel minidump driver as minidump as a download mode exists even without kernel driver and it can be enabled via SCM driver to collect firmware minidump. drivers/firmware/qcom/Kconfig | 11 ------ drivers/firmware/qcom/qcom_scm.c | 60 +++++++++++++++++++++++++++----- 2 files changed, 52 insertions(+), 19 deletions(-) diff --git a/drivers/firmware/qcom/Kconfig b/drivers/firmware/qcom/Kconfig index 7f6eb4174734..33b282aaec01 100644 --- a/drivers/firmware/qcom/Kconfig +++ b/drivers/firmware/qcom/Kconfig @@ -40,17 +40,6 @@ config QCOM_TZMEM_MODE_SHMBRIDGE endchoice -config QCOM_SCM_DOWNLOAD_MODE_DEFAULT - bool "Qualcomm download mode enabled by default" - depends on QCOM_SCM - help - A device with "download mode" enabled will upon an unexpected - warm-restart enter a special debug mode that allows the user to - "download" memory content over USB for offline postmortem analysis. - The feature can be enabled/disabled on the kernel command line. - - Say Y here to enable "download mode" by default. - config QCOM_QSEECOM bool "Qualcomm QSEECOM interface driver" depends on QCOM_SCM=y diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c index 0f5ac346bda4..55955f675cd0 100644 --- a/drivers/firmware/qcom/qcom_scm.c +++ b/drivers/firmware/qcom/qcom_scm.c @@ -18,6 +18,7 @@ #include <linux/init.h> #include <linux/interconnect.h> #include <linux/interrupt.h> +#include <linux/kstrtox.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_address.h> @@ -32,8 +33,7 @@ #include "qcom_scm.h" #include "qcom_tzmem.h" -static bool download_mode = IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT); -module_param(download_mode, bool, 0); +static u32 download_mode; struct qcom_scm { struct device *dev; @@ -134,6 +134,11 @@ static const char * const qcom_scm_convention_names[] = { [SMC_CONVENTION_LEGACY] = "smc legacy", }; +static const char * const download_mode_name[] = { + [QCOM_DLOAD_NODUMP] = "off", + [QCOM_DLOAD_FULLDUMP] = "full", +}; + static struct qcom_scm *__scm; static int qcom_scm_clk_enable(void) @@ -526,17 +531,16 @@ static int qcom_scm_io_rmw(phys_addr_t addr, unsigned int mask, unsigned int val return qcom_scm_io_writel(addr, new); } -static void qcom_scm_set_download_mode(bool enable) +static void qcom_scm_set_download_mode(u32 dload_mode) { - u32 val = enable ? QCOM_DLOAD_FULLDUMP : QCOM_DLOAD_NODUMP; int ret = 0; if (__scm->dload_mode_addr) { ret = qcom_scm_io_rmw(__scm->dload_mode_addr, QCOM_DLOAD_MASK, - FIELD_PREP(QCOM_DLOAD_MASK, val)); + FIELD_PREP(QCOM_DLOAD_MASK, dload_mode)); } else if (__qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_BOOT, QCOM_SCM_BOOT_SET_DLOAD_MODE)) { - ret = __qcom_scm_set_dload_mode(__scm->dev, enable); + ret = __qcom_scm_set_dload_mode(__scm->dev, !!dload_mode); } else { dev_err(__scm->dev, "No available mechanism for setting download mode\n"); @@ -1886,6 +1890,46 @@ static irqreturn_t qcom_scm_irq_handler(int irq, void *data) return IRQ_HANDLED; } +static int get_download_mode(char *buffer, const struct kernel_param *kp) +{ + if (download_mode >= ARRAY_SIZE(download_mode_name)) + return sysfs_emit(buffer, "unknown mode\n"); + + return sysfs_emit(buffer, "%s\n", download_mode_name[download_mode]); +} + +static int set_download_mode(const char *val, const struct kernel_param *kp) +{ + bool tmp; + int ret; + + ret = sysfs_match_string(download_mode_name, val); + if (ret < 0) { + ret = kstrtobool(val, &tmp); + if (ret < 0) { + pr_err("qcom_scm: err: %d\n", ret); + return ret; + } + + ret = tmp ? 1 : 0; + } + + download_mode = ret; + if (__scm) + qcom_scm_set_download_mode(download_mode); + + return 0; +} + +static const struct kernel_param_ops download_mode_param_ops = { + .get = get_download_mode, + .set = set_download_mode, +}; + +module_param_cb(download_mode, &download_mode_param_ops, NULL, 0644); +MODULE_PARM_DESC(download_mode, + "download mode: off/0/N for no dump mode, full/on/1/Y for full dump mode"); + static int qcom_scm_probe(struct platform_device *pdev) { struct qcom_tzmem_pool_config pool_config; @@ -1950,7 +1994,7 @@ static int qcom_scm_probe(struct platform_device *pdev) __get_convention(); /* - * If requested enable "download mode", from this point on warmboot + * If "download mode" is requested, from this point on warmboot * will cause the boot stages to enter download mode, unless * disabled below by a clean shutdown/reboot. */ @@ -2001,7 +2045,7 @@ static int qcom_scm_probe(struct platform_device *pdev) static void qcom_scm_shutdown(struct platform_device *pdev) { /* Clean shutdown, disable download mode to allow normal restart */ - qcom_scm_set_download_mode(false); + qcom_scm_set_download_mode(QCOM_DLOAD_NODUMP); } static const struct of_device_id qcom_scm_dt_match[] = { -- 2.34.1
