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authorShuai Xue <xueshuai@linux.alibaba.com>2021-10-26 10:28:29 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2021-10-27 21:33:26 +0300
commitbf7fc0c369585e34652d5666ed590d5cac07c2e2 (patch)
tree6f41ca8cd2692d6e99e7c62f7219533868771642 /drivers/acpi/apei
parent3906fe9bb7f1a2c8667ae54e967dc8690824f4ea (diff)
downloadlinux-bf7fc0c369585e34652d5666ed590d5cac07c2e2.tar.xz
ACPI: APEI: EINJ: Relax platform response timeout to 1 second
When injecting an error into the platform, the OSPM executes an EXECUTE_OPERATION action to instruct the platform to begin the injection operation. And then, the OSPM busy waits for a while by continually executing CHECK_BUSY_STATUS action until the platform indicates that the operation is complete. More specifically, the platform is limited to respond within 1 millisecond right now. This is too strict for some platforms. For example, in Arm platform, when injecting a Processor Correctable error, the OSPM will warn: Firmware does not respond in time. And a message is printed on the console: echo: write error: Input/output error We observe that the waiting time for DDR error injection is about 10 ms and that for PCIe error injection is about 500 ms in Arm platform. In this patch, we relax the response timeout to 1 second. Signed-off-by: Shuai Xue <xueshuai@linux.alibaba.com> Reviewed-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/apei')
-rw-r--r--drivers/acpi/apei/einj.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c
index 2882450c443e..edb2622fd35f 100644
--- a/drivers/acpi/apei/einj.c
+++ b/drivers/acpi/apei/einj.c
@@ -28,9 +28,10 @@
#undef pr_fmt
#define pr_fmt(fmt) "EINJ: " fmt
-#define SPIN_UNIT 100 /* 100ns */
-/* Firmware should respond within 1 milliseconds */
-#define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC)
+#define SLEEP_UNIT_MIN 1000 /* 1ms */
+#define SLEEP_UNIT_MAX 5000 /* 5ms */
+/* Firmware should respond within 1 seconds */
+#define FIRMWARE_TIMEOUT (1 * USEC_PER_SEC)
#define ACPI5_VENDOR_BIT BIT(31)
#define MEM_ERROR_MASK (ACPI_EINJ_MEMORY_CORRECTABLE | \
ACPI_EINJ_MEMORY_UNCORRECTABLE | \
@@ -171,13 +172,13 @@ static int einj_get_available_error_type(u32 *type)
static int einj_timedout(u64 *t)
{
- if ((s64)*t < SPIN_UNIT) {
+ if ((s64)*t < SLEEP_UNIT_MIN) {
pr_warn(FW_WARN "Firmware does not respond in time\n");
return 1;
}
- *t -= SPIN_UNIT;
- ndelay(SPIN_UNIT);
- touch_nmi_watchdog();
+ *t -= SLEEP_UNIT_MIN;
+ usleep_range(SLEEP_UNIT_MIN, SLEEP_UNIT_MAX);
+
return 0;
}