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haven: ctrl: add debugfs interface to control hyp uart

Browse source 
Hyp uart is disabled default today in ABL. Provide debugfs
interface to users when they want to enable hyp uart to
debug hypervisor and VM issues.

Change-Id: I5e2c0501ed309a65c9dff1304b2e88e0d58917ae
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>
This commit is contained in:
Murali Nalajala 2020-12-03 15:27:33 -08:00
commit 704f8b0a03
1 changed files with 59 additions and 25 deletions
Download patch file Download diff file Expand all files Collapse all files

84
drivers/virt/haven/hh_ctrl.c
View file

@ -15,9 +15,6 @@
#include <linux/haven/hcall.h>
#include <linux/haven/hh_errno.h>
#define QC_HYP_SMCCC_UART_DISABLE \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
ARM_SMCCC_OWNER_VENDOR_HYPERVISOR, 0x0)
#define QC_HYP_SMCCC_CALL_UID \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
ARM_SMCCC_OWNER_VENDOR_HYPERVISOR, 0xff01)
@ -48,27 +45,6 @@
static bool qc_hyp_calls;
static struct hh_hcall_hyp_identify_resp haven_api;
static bool disable_uart;
#if !defined(CONFIG_HH_DISABLE_UART)
static int __init setup_nohyp_uart(char *arg)
{
disable_uart = true;
return 0;
}
early_param("nohyp_uart", setup_nohyp_uart);
#endif
static void hh_disable_uart(void)
{
#if defined(CONFIG_HH_DISABLE_UART)
disable_uart = true;
#endif
if (disable_uart) {
pr_info("Haven: disabling HYP UART\n");
arm_smccc_1_1_smc(QC_HYP_SMCCC_UART_DISABLE, NULL);
}
}
static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buffer)
@ -119,7 +95,44 @@ static void __exit hh_sysfs_unregister(void)
}
#if defined(CONFIG_DEBUG_FS)
#define QC_HYP_SMCCC_UART_DISABLE \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
ARM_SMCCC_OWNER_VENDOR_HYPERVISOR, 0x0)
#define QC_HYP_SMCCC_UART_ENABLE \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
ARM_SMCCC_OWNER_VENDOR_HYPERVISOR, 0x1)
#define ENABLE 1
#define DISABLE 0
static struct dentry *hh_dbgfs_dir;
static int hyp_uart_enable;
static void hh_control_hyp_uart(int val)
{
switch (val) {
case ENABLE:
if (!hyp_uart_enable) {
hyp_uart_enable = val;
pr_info("Haven: enabling HYP UART\n");
arm_smccc_1_1_smc(QC_HYP_SMCCC_UART_ENABLE, NULL);
} else {
pr_info("Haven: HYP UART already enabled\n");
}
break;
case DISABLE:
if (hyp_uart_enable) {
hyp_uart_enable = val;
pr_info("Haven: disabling HYP UART\n");
arm_smccc_1_1_smc(QC_HYP_SMCCC_UART_DISABLE, NULL);
} else {
pr_info("Haven: HYP UART already disabled\n");
}
break;
default:
pr_info("Haven: supported values disable(0)/enable(1)\n");
}
}
static int hh_dbgfs_trace_class_set(void *data, u64 val)
{
@ -137,6 +150,18 @@ static int hh_dbgfs_trace_class_get(void *data, u64 *val)
return hh_remap_error(hh_hcall_trace_update_class_flags(0, 0, val));
}
static int hh_dbgfs_hyp_uart_set(void *data, u64 val)
{
hh_control_hyp_uart(val);
return 0;
}
static int hh_dbgfs_hyp_uart_get(void *data, u64 *val)
{
*val = hyp_uart_enable;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(hh_dbgfs_trace_class_set_fops,
hh_dbgfs_trace_class_get,
hh_dbgfs_trace_class_set,
@ -147,6 +172,11 @@ DEFINE_DEBUGFS_ATTRIBUTE(hh_dbgfs_trace_class_clear_fops,
hh_dbgfs_trace_class_clear,
"0x%llx\n");
DEFINE_DEBUGFS_ATTRIBUTE(hh_dbgfs_hyp_uart_ctrl_fops,
hh_dbgfs_hyp_uart_get,
hh_dbgfs_hyp_uart_set,
"0x%llx\n");
static int __init hh_dbgfs_register(void)
{
struct dentry *dentry;
@ -165,6 +195,11 @@ static int __init hh_dbgfs_register(void)
NULL, &hh_dbgfs_trace_class_clear_fops);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
dentry = debugfs_create_file("hyp_uart_ctrl", 0600, hh_dbgfs_dir,
NULL, &hh_dbgfs_hyp_uart_ctrl_fops);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
}
return 0;
@ -204,7 +239,6 @@ static int __init hh_ctrl_init(void)
qc_hyp_calls = true;
if (qc_hyp_calls) {
hh_disable_uart();
ret = hh_sysfs_register();
if (ret)
return ret;