[Intel-gfx] [PATCH] Core-for-CI:ICL_only Disable ACPI idle driver

[Anshuman Gupta]

There were system hung observed while running i915_pm_rpm test.
FDO https://bugs.freedesktop.org/show_bug.cgi?id=108840
Root cause is believed to due to page fault in ACPI idle (FDO comment 18)
driver, it has been suggested by Daniel to disable ACPI idle
driver for CI system, this patch only meant for ICL.

Cc: martin.peres at intel.com
Cc: daniel.vetter at intel.com

Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
---
 drivers/acpi/processor_driver.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 9d6aff2..6e3ef2d 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -35,6 +35,9 @@
 
 #include <acpi/processor.h>
 
+#include <asm/cpu_device_id.h>
+#include <asm/intel-family.h>
+
 #include "internal.h"
 
 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
@@ -58,6 +61,13 @@ static const struct acpi_device_id processor_device_ids[] = {
 };
 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
 
+#define ICPU(model)	{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
+static const struct x86_cpu_id intel_cpu_ids[] = {
+	ICPU(INTEL_FAM6_ICELAKE_MOBILE),	/* ICL */
+	{}
+};
+MODULE_DEVICE_TABLE(x86cpu, intel_pmc_core_ids);
+
 static struct device_driver acpi_processor_driver = {
 	.name = "processor",
 	.bus = &cpu_subsys,
@@ -226,6 +236,7 @@ static inline void acpi_pss_perf_exit(struct acpi_processor *pr,
 static int __acpi_processor_start(struct acpi_device *device)
 {
 	struct acpi_processor *pr = acpi_driver_data(device);
+	const struct x86_cpu_id *id;
 	acpi_status status;
 	int result = 0;
 
@@ -239,7 +250,9 @@ static int __acpi_processor_start(struct acpi_device *device)
 	if (result && !IS_ENABLED(CONFIG_ACPI_CPU_FREQ_PSS))
 		dev_dbg(&device->dev, "CPPC data invalid or not present\n");
 
-	if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
+	id = x86_match_cpu(intel_cpu_ids);
+	if (!id && (!cpuidle_get_driver() || cpuidle_get_driver() ==
+		&acpi_idle_driver))
 		acpi_processor_power_init(pr);
 
 	result = acpi_pss_perf_init(pr, device);
-- 
2.7.4