drm/amdgpu: Keep reset handlers shared

Instead of maintaining a list per device, keep the reset handlers common
per ASIC family. A pointer to the list of handlers is maintained in
reset control.
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Le Ma <le.ma@amd.com>
Reviewed-by: Asad Kamal <asad.kamal@amd.com>
Tested-by: Asad Kamal <asad.kamal@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/aldebaran.c

@@ -48,20 +48,19 @@ aldebaran_get_reset_handler(struct amdgpu_reset_control *reset_ctl,
 {
 	struct amdgpu_reset_handler *handler;
 	struct amdgpu_device *adev = (struct amdgpu_device *)reset_ctl->handle;
+	int i;
 
 	if (reset_context->method != AMD_RESET_METHOD_NONE) {
 		dev_dbg(adev->dev, "Getting reset handler for method %d\n",
 			reset_context->method);
-		list_for_each_entry(handler, &reset_ctl->reset_handlers,
-				     handler_list) {
+		for_each_handler(i, handler, reset_ctl) {
 			if (handler->reset_method == reset_context->method)
 				return handler;
 		}
 	}
 
 	if (aldebaran_is_mode2_default(reset_ctl)) {
-		list_for_each_entry(handler, &reset_ctl->reset_handlers,
-				     handler_list) {
+		for_each_handler(i, handler, reset_ctl)	{
 			if (handler->reset_method == AMD_RESET_METHOD_MODE2) {
 				reset_context->method = AMD_RESET_METHOD_MODE2;
 				return handler;
@@ -124,9 +123,9 @@ static void aldebaran_async_reset(struct work_struct *work)
 	struct amdgpu_reset_control *reset_ctl =
 		container_of(work, struct amdgpu_reset_control, reset_work);
 	struct amdgpu_device *adev = (struct amdgpu_device *)reset_ctl->handle;
+	int i;
 
-	list_for_each_entry(handler, &reset_ctl->reset_handlers,
-			     handler_list) {
+	for_each_handler(i, handler, reset_ctl)	{
 		if (handler->reset_method == reset_ctl->active_reset) {
 			dev_dbg(adev->dev, "Resetting device\n");
 			handler->do_reset(adev);
@@ -395,6 +394,11 @@ static struct amdgpu_reset_handler aldebaran_mode2_handler = {
 	.do_reset		= aldebaran_mode2_reset,
 };
 
+static struct amdgpu_reset_handler
+	*aldebaran_rst_handlers[AMDGPU_RESET_MAX_HANDLERS] = {
+		&aldebaran_mode2_handler,
+	};
+
 int aldebaran_reset_init(struct amdgpu_device *adev)
 {
 	struct amdgpu_reset_control *reset_ctl;
@@ -408,10 +412,9 @@ int aldebaran_reset_init(struct amdgpu_device *adev)
 	reset_ctl->active_reset = AMD_RESET_METHOD_NONE;
 	reset_ctl->get_reset_handler = aldebaran_get_reset_handler;
 
-	INIT_LIST_HEAD(&reset_ctl->reset_handlers);
 	INIT_WORK(&reset_ctl->reset_work, reset_ctl->async_reset);
 	/* Only mode2 is handled through reset control now */
-	amdgpu_reset_add_handler(reset_ctl, &aldebaran_mode2_handler);
+	reset_ctl->reset_handlers = &aldebaran_rst_handlers;
 
 	adev->reset_cntl = reset_ctl;
 

drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c

@@ -26,14 +26,6 @@
 #include "sienna_cichlid.h"
 #include "smu_v13_0_10.h"
 
-int amdgpu_reset_add_handler(struct amdgpu_reset_control *reset_ctl,
-			     struct amdgpu_reset_handler *handler)
-{
-	/* TODO: Check if handler exists? */
-	list_add_tail(&handler->handler_list, &reset_ctl->reset_handlers);
-	return 0;
-}
-
 int amdgpu_reset_init(struct amdgpu_device *adev)
 {
 	int ret = 0;

drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h

@@ -26,6 +26,8 @@
 
 #include "amdgpu.h"
 
+#define AMDGPU_RESET_MAX_HANDLERS 5
+
 enum AMDGPU_RESET_FLAGS {
 
 	AMDGPU_NEED_FULL_RESET = 0,
@@ -44,7 +46,6 @@ struct amdgpu_reset_context {
 
 struct amdgpu_reset_handler {
 	enum amd_reset_method reset_method;
-	struct list_head handler_list;
 	int (*prepare_env)(struct amdgpu_reset_control *reset_ctl,
 			   struct amdgpu_reset_context *context);
 	int (*prepare_hwcontext)(struct amdgpu_reset_control *reset_ctl,
@@ -63,7 +64,8 @@ struct amdgpu_reset_control {
 	void *handle;
 	struct work_struct reset_work;
 	struct mutex reset_lock;
-	struct list_head reset_handlers;
+	struct amdgpu_reset_handler *(
+		*reset_handlers)[AMDGPU_RESET_MAX_HANDLERS];
 	atomic_t in_reset;
 	enum amd_reset_method active_reset;
 	struct amdgpu_reset_handler *(*get_reset_handler)(
@@ -97,8 +99,10 @@ int amdgpu_reset_prepare_hwcontext(struct amdgpu_device *adev,
 int amdgpu_reset_perform_reset(struct amdgpu_device *adev,
 			       struct amdgpu_reset_context *reset_context);
 
-int amdgpu_reset_add_handler(struct amdgpu_reset_control *reset_ctl,
-			     struct amdgpu_reset_handler *handler);
+int amdgpu_reset_prepare_env(struct amdgpu_device *adev,
+			     struct amdgpu_reset_context *reset_context);
+int amdgpu_reset_restore_env(struct amdgpu_device *adev,
+			     struct amdgpu_reset_context *reset_context);
 
 struct amdgpu_reset_domain *amdgpu_reset_create_reset_domain(enum amdgpu_reset_domain_type type,
 							     char *wq_name);
@@ -126,4 +130,8 @@ void amdgpu_device_lock_reset_domain(struct amdgpu_reset_domain *reset_domain);
 
 void amdgpu_device_unlock_reset_domain(struct amdgpu_reset_domain *reset_domain);
 
+#define for_each_handler(i, handler, reset_ctl)                  \
+	for (i = 0; (i < AMDGPU_RESET_MAX_HANDLERS) &&           \
+		    (handler = (*reset_ctl->reset_handlers)[i]); \
+	     ++i)
 #endif

drivers/gpu/drm/amd/amdgpu/sienna_cichlid.c

@@ -48,18 +48,17 @@ sienna_cichlid_get_reset_handler(struct amdgpu_reset_control *reset_ctl,
 			    struct amdgpu_reset_context *reset_context)
 {
 	struct amdgpu_reset_handler *handler;
+	int i;
 
 	if (reset_context->method != AMD_RESET_METHOD_NONE) {
-		list_for_each_entry(handler, &reset_ctl->reset_handlers,
-				     handler_list) {
+		for_each_handler(i, handler, reset_ctl)	{
 			if (handler->reset_method == reset_context->method)
 				return handler;
 		}
 	}
 
 	if (sienna_cichlid_is_mode2_default(reset_ctl)) {
-		list_for_each_entry (handler, &reset_ctl->reset_handlers,
-				     handler_list) {
+		for_each_handler(i, handler, reset_ctl)	{
 			if (handler->reset_method == AMD_RESET_METHOD_MODE2)
 				return handler;
 		}
@@ -120,9 +119,9 @@ static void sienna_cichlid_async_reset(struct work_struct *work)
 	struct amdgpu_reset_control *reset_ctl =
 		container_of(work, struct amdgpu_reset_control, reset_work);
 	struct amdgpu_device *adev = (struct amdgpu_device *)reset_ctl->handle;
+	int i;
 
-	list_for_each_entry(handler, &reset_ctl->reset_handlers,
-			     handler_list) {
+	for_each_handler(i, handler, reset_ctl)	{
 		if (handler->reset_method == reset_ctl->active_reset) {
 			dev_dbg(adev->dev, "Resetting device\n");
 			handler->do_reset(adev);
@@ -281,6 +280,11 @@ static struct amdgpu_reset_handler sienna_cichlid_mode2_handler = {
 	.do_reset		= sienna_cichlid_mode2_reset,
 };
 
+static struct amdgpu_reset_handler
+	*sienna_cichlid_rst_handlers[AMDGPU_RESET_MAX_HANDLERS] = {
+		&sienna_cichlid_mode2_handler,
+	};
+
 int sienna_cichlid_reset_init(struct amdgpu_device *adev)
 {
 	struct amdgpu_reset_control *reset_ctl;
@@ -294,11 +298,9 @@ int sienna_cichlid_reset_init(struct amdgpu_device *adev)
 	reset_ctl->active_reset = AMD_RESET_METHOD_NONE;
 	reset_ctl->get_reset_handler = sienna_cichlid_get_reset_handler;
 
-	INIT_LIST_HEAD(&reset_ctl->reset_handlers);
 	INIT_WORK(&reset_ctl->reset_work, reset_ctl->async_reset);
 	/* Only mode2 is handled through reset control now */
-	amdgpu_reset_add_handler(reset_ctl, &sienna_cichlid_mode2_handler);
-
+	reset_ctl->reset_handlers = &sienna_cichlid_rst_handlers;
 	adev->reset_cntl = reset_ctl;
 
 	return 0;

drivers/gpu/drm/amd/amdgpu/smu_v13_0_10.c

@@ -44,10 +44,10 @@ smu_v13_0_10_get_reset_handler(struct amdgpu_reset_control *reset_ctl,
 {
 	struct amdgpu_reset_handler *handler;
 	struct amdgpu_device *adev = (struct amdgpu_device *)reset_ctl->handle;
+	int i;
 
 	if (reset_context->method != AMD_RESET_METHOD_NONE) {
-		list_for_each_entry(handler, &reset_ctl->reset_handlers,
-				     handler_list) {
+		for_each_handler(i, handler, reset_ctl) {
 			if (handler->reset_method == reset_context->method)
 				return handler;
 		}
@@ -55,8 +55,7 @@ smu_v13_0_10_get_reset_handler(struct amdgpu_reset_control *reset_ctl,
 
 	if (smu_v13_0_10_is_mode2_default(reset_ctl) &&
 		amdgpu_asic_reset_method(adev) == AMD_RESET_METHOD_MODE2) {
-		list_for_each_entry (handler, &reset_ctl->reset_handlers,
-				     handler_list) {
+		for_each_handler(i, handler, reset_ctl)	{
 			if (handler->reset_method == AMD_RESET_METHOD_MODE2)
 				return handler;
 		}
@@ -119,9 +118,9 @@ static void smu_v13_0_10_async_reset(struct work_struct *work)
 	struct amdgpu_reset_control *reset_ctl =
 		container_of(work, struct amdgpu_reset_control, reset_work);
 	struct amdgpu_device *adev = (struct amdgpu_device *)reset_ctl->handle;
+	int i;
 
-	list_for_each_entry(handler, &reset_ctl->reset_handlers,
-			     handler_list) {
+	for_each_handler(i, handler, reset_ctl)	{
 		if (handler->reset_method == reset_ctl->active_reset) {
 			dev_dbg(adev->dev, "Resetting device\n");
 			handler->do_reset(adev);
@@ -272,6 +271,11 @@ static struct amdgpu_reset_handler smu_v13_0_10_mode2_handler = {
 	.do_reset		= smu_v13_0_10_mode2_reset,
 };
 
+static struct amdgpu_reset_handler
+	*smu_v13_0_10_rst_handlers[AMDGPU_RESET_MAX_HANDLERS] = {
+		&smu_v13_0_10_mode2_handler,
+	};
+
 int smu_v13_0_10_reset_init(struct amdgpu_device *adev)
 {
 	struct amdgpu_reset_control *reset_ctl;
@@ -285,10 +289,9 @@ int smu_v13_0_10_reset_init(struct amdgpu_device *adev)
 	reset_ctl->active_reset = AMD_RESET_METHOD_NONE;
 	reset_ctl->get_reset_handler = smu_v13_0_10_get_reset_handler;
 
-	INIT_LIST_HEAD(&reset_ctl->reset_handlers);
 	INIT_WORK(&reset_ctl->reset_work, reset_ctl->async_reset);
 	/* Only mode2 is handled through reset control now */
-	amdgpu_reset_add_handler(reset_ctl, &smu_v13_0_10_mode2_handler);
+	reset_ctl->reset_handlers = &smu_v13_0_10_rst_handlers;
 
 	adev->reset_cntl = reset_ctl;