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soc: qcom: add kryo_e76 debugfs node

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To disable and enable Kryo hardware errata 76 workaround at
runtime, expose a debugfs interface. Wrote codes using e74/e76
API and data as a starting point.

/sys/kernel/debug/scm_errata/kryo_e76
This allows Kryo errata 76 workaround to be toggled
off or on (on affected devices) by echoing 0 or 1 to the file.

Change-Id: I3d682021aa98eef5421ac2e7578da02f2ea98081
Signed-off-by: Se Wang (Patrick) Oh <sewango@codeaurora.org>
This commit is contained in:
Se Wang (Patrick) Oh 2015-10-21 18:21:23 -07:00 • committed by Rohit Vaswani
parent 32b29d83ff
commit 051df5bd9b
1 changed files with 51 additions and 3 deletions
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54
drivers/soc/qcom/scm-errata.c
View file

@ -17,12 +17,15 @@
#include <linux/cpu.h>
#include <soc/qcom/scm.h>
#define KRYO_ERRATA_74_75_ID 0x12
#define SCM_KRYO_ERRATA_ID 0x12
#define ERRATA_WA_DISABLE 0
#define ERRATA_WA_ENABLE 1
#define ERRATA_74_75_ID_BIT 0x000
#define ERRATA_76_ID_BIT 0x100
static struct dentry *debugfs_base;
static bool kryo_e74_e75_wa = true;
static bool kryo_e76_wa;
static void kryo_e74_e75_scm(void *enable)
{
@ -34,8 +37,9 @@ static void kryo_e74_e75_scm(void *enable)
desc.arginfo = SCM_ARGS(1);
desc.args[0] = enable ? ERRATA_WA_ENABLE : ERRATA_WA_DISABLE;
desc.args[0] |= ERRATA_74_75_ID_BIT;
ret = scm_call2_atomic(SCM_SIP_FNID(SCM_SVC_BOOT, KRYO_ERRATA_74_75_ID),
ret = scm_call2_atomic(SCM_SIP_FNID(SCM_SVC_BOOT, SCM_KRYO_ERRATA_ID),
&desc);
if (ret)
pr_err("Failed to %s ERRATA_74_75 workaround\n",
@ -62,8 +66,49 @@ static int kryo_e74_e75_get(void *data, u64 *val)
return 0;
}
static void kryo_e76_scm(void *enable)
{
int ret;
struct scm_desc desc = {0};
if (!is_scm_armv8())
return;
desc.arginfo = SCM_ARGS(1);
desc.args[0] = enable ? ERRATA_WA_ENABLE : ERRATA_WA_DISABLE;
desc.args[0] |= ERRATA_76_ID_BIT;
ret = scm_call2_atomic(SCM_SIP_FNID(SCM_SVC_BOOT, SCM_KRYO_ERRATA_ID),
&desc);
if (ret)
pr_err("Failed to %s ERRATA_76 workaround\n",
enable ? "enable" : "disable");
}
static int kryo_e76_set(void *data, u64 val)
{
if ((val && kryo_e76_wa) || (!val && !kryo_e76_wa))
return 0;
kryo_e76_wa = !!val;
get_cpu();
on_each_cpu(kryo_e76_scm, (void *)kryo_e76_wa, 1);
put_cpu();
return 0;
}
static int kryo_e76_get(void *data, u64 *val)
{
*val = kryo_e76_wa;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(kryo_e74_e75_fops, kryo_e74_e75_get,
kryo_e74_e75_set, "%llu\n");
DEFINE_SIMPLE_ATTRIBUTE(kryo_e76_fops, kryo_e76_get,
kryo_e76_set, "%llu\n");
static int scm_errata_notifier_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
@ -71,6 +116,7 @@ static int scm_errata_notifier_callback(struct notifier_block *nfb,
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_STARTING:
kryo_e74_e75_scm((void *)kryo_e74_e75_wa);
kryo_e76_scm((void *)kryo_e76_wa);
break;
}
return 0;
@ -91,7 +137,9 @@ static int __init scm_errata_init(void)
if (!debugfs_create_file("kryo_e74_e75", S_IRUGO | S_IWUSR,
debugfs_base, NULL, &kryo_e74_e75_fops))
goto err;
if (!debugfs_create_file("kryo_e76", S_IRUGO | S_IWUSR,
debugfs_base, NULL, &kryo_e76_fops))
goto err;
ret = register_hotcpu_notifier(&scm_errata_notifier);
if (ret)
goto err;