| Message ID | 1424904852-12719-3-git-send-email-lina.iyer@linaro.org |
|---|---|
| State | New |
| Headers | show |
On Thu, Feb 26 2015 at 11:47 -0700, Kevin Hilman wrote: >Lina Iyer <lina.iyer@linaro.org> writes: > >> A core can be powered down for cpuidle or when it is hotplugged of. > >s/of/off/ ? > Thanks, took care of it. >> In >> either case, the warmboot return address would be different. Allow >> setting the warmboot address for a specific cpu, optimize and write to >> the firmware if the address is different than the previously set >> address. >> >> Also we do not need to export the warmboot flags. Move them into the >> implementation file. >> >> Signed-off-by: Lina Iyer <lina.iyer@linaro.org> >> --- >> arch/arm/mach-qcom/scm-boot.c | 38 ++++++++++++++++++++++++++++++++++++++ >> arch/arm/mach-qcom/scm-boot.h | 7 +++---- >> 2 files changed, 41 insertions(+), 4 deletions(-) >> >> diff --git a/arch/arm/mach-qcom/scm-boot.c b/arch/arm/mach-qcom/scm-boot.c >> index 45cee3e..cb73134 100644 >> --- a/arch/arm/mach-qcom/scm-boot.c >> +++ b/arch/arm/mach-qcom/scm-boot.c >> @@ -1,4 +1,5 @@ >> /* Copyright (c) 2010, Code Aurora Forum. All rights reserved. >> + * Copyright (c) 2014, Linaro Ltd. >> * >> * This program is free software; you can redistribute it and/or modify >> * it under the terms of the GNU General Public License version 2 and >> @@ -21,6 +22,23 @@ >> #include "scm.h" >> #include "scm-boot.h" >> >> +#define SCM_FLAG_WARMBOOT_CPU0 0x04 >> +#define SCM_FLAG_WARMBOOT_CPU1 0x02 >> +#define SCM_FLAG_WARMBOOT_CPU2 0x10 >> +#define SCM_FLAG_WARMBOOT_CPU3 0x40 >> + >> +struct scm_warmboot { >> + int flag; >> + void *entry; >> +}; >> + >> +static struct scm_warmboot scm_flags[] = { >> + { .flag = SCM_FLAG_WARMBOOT_CPU0 }, >> + { .flag = SCM_FLAG_WARMBOOT_CPU1 }, >> + { .flag = SCM_FLAG_WARMBOOT_CPU2 }, >> + { .flag = SCM_FLAG_WARMBOOT_CPU3 }, >> +}; >> + >> /* >> * Set the cold/warm boot address for one of the CPU cores. >> */ >> @@ -31,9 +49,29 @@ int scm_set_boot_addr(phys_addr_t addr, int flags) >> phys_addr_t addr; >> } cmd; >> >> + might_sleep(); >> + > >Unrelated change? > >Looking closer at scm_call(), looks like the might_sleep() should go >inside scm_call() where it uses the mutex. > Removed it from this patch. >> cmd.addr = addr; >> cmd.flags = flags; >> return scm_call(SCM_SVC_BOOT, SCM_BOOT_ADDR, >> &cmd, sizeof(cmd), NULL, 0); >> } >> EXPORT_SYMBOL(scm_set_boot_addr); >> + >> +int scm_set_warm_boot_addr(void *entry, int cpu) >> +{ >> + int ret; >> + >> + /* >> + * Reassign only if we are switching from hotplug entry point >> + * to cpuidle entry point or vice versa. >> + */ >> + if (entry == scm_flags[cpu].entry) >> + return 0; >> + >> + ret = scm_set_boot_addr(virt_to_phys(entry), scm_flags[cpu].flag); >> + if (!ret) >> + scm_flags[cpu].entry = entry; >> + >> + return ret; >> +} >> diff --git a/arch/arm/mach-qcom/scm-boot.h b/arch/arm/mach-qcom/scm-boot.h >> index 02b445c..97dbf58 100644 >> --- a/arch/arm/mach-qcom/scm-boot.h >> +++ b/arch/arm/mach-qcom/scm-boot.h >> @@ -1,4 +1,5 @@ >> /* Copyright (c) 2010, Code Aurora Forum. All rights reserved. >> + * Copyright (c) 2014, Linaro Ltd. >> * >> * This program is free software; you can redistribute it and/or modify >> * it under the terms of the GNU General Public License version 2 and >> @@ -9,6 +10,7 @@ >> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the >> * GNU General Public License for more details. >> */ >> + >> #ifndef __MACH_SCM_BOOT_H >> #define __MACH_SCM_BOOT_H >> >> @@ -16,11 +18,8 @@ >> #define SCM_FLAG_COLDBOOT_CPU1 0x01 >> #define SCM_FLAG_COLDBOOT_CPU2 0x08 >> #define SCM_FLAG_COLDBOOT_CPU3 0x20 >> -#define SCM_FLAG_WARMBOOT_CPU0 0x04 >> -#define SCM_FLAG_WARMBOOT_CPU1 0x02 >> -#define SCM_FLAG_WARMBOOT_CPU2 0x10 >> -#define SCM_FLAG_WARMBOOT_CPU3 0x40 > >You just added these in patch 1, and now moved them. I would just >squash the 2 patches together. > Sure. Thanks! >Kevin -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/arm/mach-qcom/scm-boot.c b/arch/arm/mach-qcom/scm-boot.c index 45cee3e..cb73134 100644 --- a/arch/arm/mach-qcom/scm-boot.c +++ b/arch/arm/mach-qcom/scm-boot.c @@ -1,4 +1,5 @@ /* Copyright (c) 2010, Code Aurora Forum. All rights reserved. + * Copyright (c) 2014, Linaro Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and @@ -21,6 +22,23 @@ #include "scm.h" #include "scm-boot.h" +#define SCM_FLAG_WARMBOOT_CPU0 0x04 +#define SCM_FLAG_WARMBOOT_CPU1 0x02 +#define SCM_FLAG_WARMBOOT_CPU2 0x10 +#define SCM_FLAG_WARMBOOT_CPU3 0x40 + +struct scm_warmboot { + int flag; + void *entry; +}; + +static struct scm_warmboot scm_flags[] = { + { .flag = SCM_FLAG_WARMBOOT_CPU0 }, + { .flag = SCM_FLAG_WARMBOOT_CPU1 }, + { .flag = SCM_FLAG_WARMBOOT_CPU2 }, + { .flag = SCM_FLAG_WARMBOOT_CPU3 }, +}; + /* * Set the cold/warm boot address for one of the CPU cores. */ @@ -31,9 +49,29 @@ int scm_set_boot_addr(phys_addr_t addr, int flags) phys_addr_t addr; } cmd; + might_sleep(); + cmd.addr = addr; cmd.flags = flags; return scm_call(SCM_SVC_BOOT, SCM_BOOT_ADDR, &cmd, sizeof(cmd), NULL, 0); } EXPORT_SYMBOL(scm_set_boot_addr); + +int scm_set_warm_boot_addr(void *entry, int cpu) +{ + int ret; + + /* + * Reassign only if we are switching from hotplug entry point + * to cpuidle entry point or vice versa. + */ + if (entry == scm_flags[cpu].entry) + return 0; + + ret = scm_set_boot_addr(virt_to_phys(entry), scm_flags[cpu].flag); + if (!ret) + scm_flags[cpu].entry = entry; + + return ret; +} diff --git a/arch/arm/mach-qcom/scm-boot.h b/arch/arm/mach-qcom/scm-boot.h index 02b445c..97dbf58 100644 --- a/arch/arm/mach-qcom/scm-boot.h +++ b/arch/arm/mach-qcom/scm-boot.h @@ -1,4 +1,5 @@ /* Copyright (c) 2010, Code Aurora Forum. All rights reserved. + * Copyright (c) 2014, Linaro Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and @@ -9,6 +10,7 @@ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ + #ifndef __MACH_SCM_BOOT_H #define __MACH_SCM_BOOT_H @@ -16,11 +18,8 @@ #define SCM_FLAG_COLDBOOT_CPU1 0x01 #define SCM_FLAG_COLDBOOT_CPU2 0x08 #define SCM_FLAG_COLDBOOT_CPU3 0x20 -#define SCM_FLAG_WARMBOOT_CPU0 0x04 -#define SCM_FLAG_WARMBOOT_CPU1 0x02 -#define SCM_FLAG_WARMBOOT_CPU2 0x10 -#define SCM_FLAG_WARMBOOT_CPU3 0x40 int scm_set_boot_addr(phys_addr_t addr, int flags); +int scm_set_warm_boot_addr(void *entry, int cpu); #endif
A core can be powered down for cpuidle or when it is hotplugged of. In either case, the warmboot return address would be different. Allow setting the warmboot address for a specific cpu, optimize and write to the firmware if the address is different than the previously set address. Also we do not need to export the warmboot flags. Move them into the implementation file. Signed-off-by: Lina Iyer <lina.iyer@linaro.org> --- arch/arm/mach-qcom/scm-boot.c | 38 ++++++++++++++++++++++++++++++++++++++ arch/arm/mach-qcom/scm-boot.h | 7 +++---- 2 files changed, 41 insertions(+), 4 deletions(-)