drm/amd/display: DMUB Outbound Interrupt Process-X86

[Why]
dmub would notify x86 response time violation by GPINT_DATAOUT

[How]
1. Use GPINT_DATAOUT to trigger x86 interrupt
2. Register GPINT_DATAOUT interrupt handler.
3. Trigger ACR while GPINT_DATAOUT occurred.

Signed-off-by: Chun-Liang Chang <[e-mail]>
Reviewed-by: Jun Lei <[e-mail]>
Acked-by: Rodrigo Siqueira <[e-mail]>
Tested-by: Daniel Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/core/dc_stat.c

···
 	status = dmub_srv_stat_get_notification(dmub, notify);
 	ASSERT(status == DMUB_STATUS_OK);
 }
+
+/**
+ *****************************************************************************
+ *  Function: dc_stat_get_dmub_dataout
+ *
+ *  @brief
+ *		Calls dmub layer to retrieve dmub gpint dataout
+ *
+ *  @param
+ *		[in] dc: dc structure
+ *		[in] dataout: dmub gpint dataout
+ *
+ *  @return
+ *     None
+ *****************************************************************************
+ */
+void dc_stat_get_dmub_dataout(const struct dc *dc, uint32_t *dataout)
+{
+	struct dmub_srv *dmub = dc->ctx->dmub_srv->dmub;
+	enum dmub_status status;
+
+	status = dmub_srv_get_gpint_dataout(dmub, dataout);
+	ASSERT(status == DMUB_STATUS_OK);
+}

drivers/gpu/drm/amd/display/dc/dc_stat.h

···
 #include "dmub/dmub_srv.h"
 
 void dc_stat_get_dmub_notification(const struct dc *dc, struct dmub_notification *notify);
+void dc_stat_get_dmub_dataout(const struct dc *dc, uint32_t *dataout);
 
 #endif /* _DC_STAT_H_ */

drivers/gpu/drm/amd/display/dc/irq_types.h

···
 	DC_IRQ_SOURCE_DC6_VLINE1,
 	DC_IRQ_SOURCE_DMCUB_OUTBOX,
 	DC_IRQ_SOURCE_DMCUB_OUTBOX0,
-
+	DC_IRQ_SOURCE_DMCUB_GENERAL_DATAOUT,
 	DAL_IRQ_SOURCES_NUMBER
 };
 

drivers/gpu/drm/amd/display/dmub/dmub_srv.h

···
 
 	uint32_t (*get_gpint_response)(struct dmub_srv *dmub);
 
+	uint32_t (*get_gpint_dataout)(struct dmub_srv *dmub);
+
 	void (*send_inbox0_cmd)(struct dmub_srv *dmub, union dmub_inbox0_data_register data);
 	uint32_t (*get_current_time)(struct dmub_srv *dmub);
 
···
  */
 enum dmub_status dmub_srv_get_gpint_response(struct dmub_srv *dmub,
 					     uint32_t *response);
+
+/**
+ * dmub_srv_get_gpint_dataout() - Queries the GPINT DATAOUT.
+ * @dmub: the dmub service
+ * @dataout: the data for the GPINT DATAOUT
+ *
+ * Returns the response code for the last GPINT DATAOUT interrupt.
+ *
+ * Can be called after software initialization.
+ *
+ * Return:
+ *   DMUB_STATUS_OK - success
+ *   DMUB_STATUS_INVALID - unspecified error
+ */
+enum dmub_status dmub_srv_get_gpint_dataout(struct dmub_srv *dmub,
+					     uint32_t *dataout);
 
 /**
  * dmub_flush_buffer_mem() - Read back entire frame buffer region.

drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.c

···
 	return REG_READ(DMCUB_SCRATCH7);
 }
 
+uint32_t dmub_dcn31_get_gpint_dataout(struct dmub_srv *dmub)
+{
+	uint32_t dataout = REG_READ(DMCUB_GPINT_DATAOUT);
+
+	REG_UPDATE(DMCUB_INTERRUPT_ENABLE, DMCUB_GPINT_IH_INT_EN, 0);
+
+	REG_WRITE(DMCUB_GPINT_DATAOUT, 0);
+	REG_UPDATE(DMCUB_INTERRUPT_ACK, DMCUB_GPINT_IH_INT_ACK, 1);
+	REG_UPDATE(DMCUB_INTERRUPT_ACK, DMCUB_GPINT_IH_INT_ACK, 0);
+
+	REG_UPDATE(DMCUB_INTERRUPT_ENABLE, DMCUB_GPINT_IH_INT_EN, 1);
+
+	return dataout;
+}
+
 union dmub_fw_boot_status dmub_dcn31_get_fw_boot_status(struct dmub_srv *dmub)
 {
 	union dmub_fw_boot_status status;

drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.h

···
 	DMUB_SR(DMCUB_TIMER_CURRENT) \
 	DMUB_SR(DMCUB_INST_FETCH_FAULT_ADDR) \
 	DMUB_SR(DMCUB_UNDEFINED_ADDRESS_FAULT_ADDR) \
-	DMUB_SR(DMCUB_DATA_WRITE_FAULT_ADDR)
+	DMUB_SR(DMCUB_DATA_WRITE_FAULT_ADDR) \
+	DMUB_SR(DMCUB_INTERRUPT_ENABLE) \
+	DMUB_SR(DMCUB_INTERRUPT_ACK)
 
 #define DMUB_DCN31_FIELDS() \
 	DMUB_SF(DMCUB_CNTL, DMCUB_ENABLE) \
···
 	DMUB_SF(MMHUBBUB_SOFT_RESET, DMUIF_SOFT_RESET) \
 	DMUB_SF(DCN_VM_FB_LOCATION_BASE, FB_BASE) \
 	DMUB_SF(DCN_VM_FB_OFFSET, FB_OFFSET) \
-	DMUB_SF(DMCUB_INBOX0_WPTR, DMCUB_INBOX0_WPTR)
+	DMUB_SF(DMCUB_INBOX0_WPTR, DMCUB_INBOX0_WPTR) \
+	DMUB_SF(DMCUB_INTERRUPT_ENABLE, DMCUB_GPINT_IH_INT_EN) \
+	DMUB_SF(DMCUB_INTERRUPT_ACK, DMCUB_GPINT_IH_INT_ACK)
 
 struct dmub_srv_dcn31_reg_offset {
 #define DMUB_SR(reg) uint32_t reg;
···
 			       union dmub_gpint_data_register reg);
 
 uint32_t dmub_dcn31_get_gpint_response(struct dmub_srv *dmub);
+
+uint32_t dmub_dcn31_get_gpint_dataout(struct dmub_srv *dmub);
 
 void dmub_dcn31_enable_dmub_boot_options(struct dmub_srv *dmub, const struct dmub_srv_hw_params *params);
 

drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c

···
 		funcs->set_gpint = dmub_dcn31_set_gpint;
 		funcs->is_gpint_acked = dmub_dcn31_is_gpint_acked;
 		funcs->get_gpint_response = dmub_dcn31_get_gpint_response;
+		funcs->get_gpint_dataout = dmub_dcn31_get_gpint_dataout;
 		funcs->get_fw_status = dmub_dcn31_get_fw_boot_status;
 		funcs->enable_dmub_boot_options = dmub_dcn31_enable_dmub_boot_options;
 		funcs->skip_dmub_panel_power_sequence = dmub_dcn31_skip_dmub_panel_power_sequence;
···
 		return DMUB_STATUS_INVALID;
 
 	*response = dmub->hw_funcs.get_gpint_response(dmub);
+
+	return DMUB_STATUS_OK;
+}
+
+enum dmub_status dmub_srv_get_gpint_dataout(struct dmub_srv *dmub,
+					     uint32_t *dataout)
+{
+	*dataout = 0;
+
+	if (!dmub->sw_init)
+		return DMUB_STATUS_INVALID;
+
+	if (!dmub->hw_funcs.get_gpint_dataout)
+		return DMUB_STATUS_INVALID;
+
+	*dataout = dmub->hw_funcs.get_gpint_dataout(dmub);
 
 	return DMUB_STATUS_OK;
 }

drivers/gpu/drm/amd/include/asic_reg/dcn/dcn_3_1_2_sh_mask.h

···
 #define DMCUB_INTERRUPT_ENABLE__DMCUB_GPINT1_INT_EN__SHIFT                                                    0xb
 #define DMCUB_INTERRUPT_ENABLE__DMCUB_GPINT2_INT_EN__SHIFT                                                    0xc
 #define DMCUB_INTERRUPT_ENABLE__DMCUB_UNDEFINED_ADDRESS_FAULT_INT_EN__SHIFT                                   0xd
+#define DMCUB_INTERRUPT_ENABLE__DMCUB_GPINT_IH_INT_EN__SHIFT                                                  0x11
 #define DMCUB_INTERRUPT_ENABLE__DMCUB_TIMER0_INT_EN_MASK                                                      0x00000001L
 #define DMCUB_INTERRUPT_ENABLE__DMCUB_TIMER1_INT_EN_MASK                                                      0x00000002L
 #define DMCUB_INTERRUPT_ENABLE__DMCUB_INBOX0_READY_INT_EN_MASK                                                0x00000004L
···
 #define DMCUB_INTERRUPT_ENABLE__DMCUB_GPINT1_INT_EN_MASK                                                      0x00000800L
 #define DMCUB_INTERRUPT_ENABLE__DMCUB_GPINT2_INT_EN_MASK                                                      0x00001000L
 #define DMCUB_INTERRUPT_ENABLE__DMCUB_UNDEFINED_ADDRESS_FAULT_INT_EN_MASK                                     0x00002000L
+#define DMCUB_INTERRUPT_ENABLE__DMCUB_GPINT_IH_INT_EN_MASK                                                    0x00020000L
 //DMCUB_INTERRUPT_ACK
 #define DMCUB_INTERRUPT_ACK__DMCUB_TIMER0_INT_ACK__SHIFT                                                      0x0
 #define DMCUB_INTERRUPT_ACK__DMCUB_TIMER1_INT_ACK__SHIFT                                                      0x1
···
 #define DMCUB_INTERRUPT_ACK__DMCUB_GPINT1_INT_ACK__SHIFT                                                      0xb
 #define DMCUB_INTERRUPT_ACK__DMCUB_GPINT2_INT_ACK__SHIFT                                                      0xc
 #define DMCUB_INTERRUPT_ACK__DMCUB_UNDEFINED_ADDRESS_FAULT_ACK__SHIFT                                         0xd
+#define DMCUB_INTERRUPT_ACK__DMCUB_GPINT_IH_INT_ACK__SHIFT                                                    0x11
 #define DMCUB_INTERRUPT_ACK__DMCUB_TIMER0_INT_ACK_MASK                                                        0x00000001L
 #define DMCUB_INTERRUPT_ACK__DMCUB_TIMER1_INT_ACK_MASK                                                        0x00000002L
 #define DMCUB_INTERRUPT_ACK__DMCUB_INBOX0_READY_INT_ACK_MASK                                                  0x00000004L
···
 #define DMCUB_INTERRUPT_ACK__DMCUB_GPINT1_INT_ACK_MASK                                                        0x00000800L
 #define DMCUB_INTERRUPT_ACK__DMCUB_GPINT2_INT_ACK_MASK                                                        0x00001000L
 #define DMCUB_INTERRUPT_ACK__DMCUB_UNDEFINED_ADDRESS_FAULT_ACK_MASK                                           0x00002000L
+#define DMCUB_INTERRUPT_ACK__DMCUB_GPINT_IH_INT_ACK_MASK                                                      0x00020000L
 //DMCUB_INTERRUPT_STATUS
 #define DMCUB_INTERRUPT_STATUS__DMCUB_TIMER0_INT_STAT__SHIFT                                                  0x0
 #define DMCUB_INTERRUPT_STATUS__DMCUB_TIMER1_INT_STAT__SHIFT                                                  0x1