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ARM: trusted_foundations: fallback when TF support is missing 

When Trusted Foundations is detected as present on the system, but
Trusted Foundations support is not built into the kernel, the kernel
used to issue a panic very early during boot, leaving little clue to the
user as to what is going wrong.

It turns out that even without TF support built-in, the kernel can boot
on a TF-enabled system provided that SMP and cpuidle are disabled. This
patch does this and continue booting on one CPU, leaving the user with a
usable (however degraded) system.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Alexandre Courbot 2014-02-07 13:35:02 +09:00 committed by Stephen Warren
parent a553b7f536
commit c3af6d6855
1 changed files with 8 additions and 3 deletions
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11
arch/arm/include/asm/trusted_foundations.h
View File

@ -30,6 +30,8 @@
#include <linux/printk.h>
#include <linux/bug.h>
#include <linux/of.h>
#include <linux/cpu.h>
#include <linux/smp.h>
struct trusted_foundations_platform_data {
unsigned int version_major;
@ -47,10 +49,13 @@ static inline void register_trusted_foundations(
struct trusted_foundations_platform_data *pd)
{
/*
* If we try to register TF, this means the system needs it to continue.
* Its absence if thus a fatal error.
* If the system requires TF and we cannot provide it, continue booting
* but disable features that cannot be provided.
*/
panic("No support for Trusted Foundations, stopping...\n");
pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
pr_err("Secondary processors as well as CPU PM will be disabled.\n");
setup_max_cpus = 0;
cpu_idle_poll_ctrl(true);
}
static inline void of_register_trusted_foundations(void)