GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/trusted-firmware/trusted-firmware-a-2.8/bl32/tsp/tsp_interrupt.c

@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2014-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <inttypes.h>
+
+#include <platform_def.h>
+
+#include <arch_helpers.h>
+#include <bl32/tsp/tsp.h>
+#include <common/debug.h>
+#include <plat/common/platform.h>
+
+#include "tsp_private.h"
+
+/*******************************************************************************
+ * This function updates the TSP statistics for S-EL1 interrupts handled
+ * synchronously i.e the ones that have been handed over by the TSPD. It also
+ * keeps count of the number of times control was passed back to the TSPD
+ * after handling the interrupt. In the future it will be possible that the
+ * TSPD hands over an S-EL1 interrupt to the TSP but does not expect it to
+ * return execution. This statistic will be useful to distinguish between these
+ * two models of synchronous S-EL1 interrupt handling. The 'elr_el3' parameter
+ * contains the address of the instruction in normal world where this S-EL1
+ * interrupt was generated.
+ ******************************************************************************/
+void tsp_update_sync_sel1_intr_stats(uint32_t type, uint64_t elr_el3)
+{
+	uint32_t linear_id = plat_my_core_pos();
+
+	tsp_stats[linear_id].sync_sel1_intr_count++;
+	if (type == TSP_HANDLE_SEL1_INTR_AND_RETURN)
+		tsp_stats[linear_id].sync_sel1_intr_ret_count++;
+
+	VERBOSE("TSP: cpu 0x%lx sync s-el1 interrupt request from 0x%" PRIx64 "\n",
+		read_mpidr(), elr_el3);
+	VERBOSE("TSP: cpu 0x%lx: %d sync s-el1 interrupt requests,"
+		" %d sync s-el1 interrupt returns\n",
+		read_mpidr(),
+		tsp_stats[linear_id].sync_sel1_intr_count,
+		tsp_stats[linear_id].sync_sel1_intr_ret_count);
+}
+
+/******************************************************************************
+ * This function is invoked when a non S-EL1 interrupt is received and causes
+ * the preemption of TSP. This function returns TSP_PREEMPTED and results
+ * in the control being handed over to EL3 for handling the interrupt.
+ *****************************************************************************/
+int32_t tsp_handle_preemption(void)
+{
+	uint32_t linear_id = plat_my_core_pos();
+
+	tsp_stats[linear_id].preempt_intr_count++;
+	VERBOSE("TSP: cpu 0x%lx: %d preempt interrupt requests\n",
+		read_mpidr(), tsp_stats[linear_id].preempt_intr_count);
+	return TSP_PREEMPTED;
+}
+
+/*******************************************************************************
+ * TSP interrupt handler is called as a part of both synchronous and
+ * asynchronous handling of TSP interrupts. Currently the physical timer
+ * interrupt is the only S-EL1 interrupt that this handler expects. It returns
+ * 0 upon successfully handling the expected interrupt and all other
+ * interrupts are treated as normal world or EL3 interrupts.
+ ******************************************************************************/
+int32_t tsp_common_int_handler(void)
+{
+	uint32_t linear_id = plat_my_core_pos(), id;
+
+	/*
+	 * Get the highest priority pending interrupt id and see if it is the
+	 * secure physical generic timer interrupt in which case, handle it.
+	 * Otherwise throw this interrupt at the EL3 firmware.
+	 *
+	 * There is a small time window between reading the highest priority
+	 * pending interrupt and acknowledging it during which another
+	 * interrupt of higher priority could become the highest pending
+	 * interrupt. This is not expected to happen currently for TSP.
+	 */
+	id = plat_ic_get_pending_interrupt_id();
+
+	/* TSP can only handle the secure physical timer interrupt */
+	if (id != TSP_IRQ_SEC_PHY_TIMER) {
+#if SPMC_AT_EL3
+		/*
+		 * With the EL3 FF-A SPMC we expect only Timer secure interrupt to fire in
+		 * the TSP, so panic if any other interrupt does.
+		 */
+		ERROR("Unexpected interrupt id %u\n", id);
+		panic();
+#else
+		return tsp_handle_preemption();
+#endif
+	}
+
+	/*
+	 * Acknowledge and handle the secure timer interrupt. Also sanity check
+	 * if it has been preempted by another interrupt through an assertion.
+	 */
+	id = plat_ic_acknowledge_interrupt();
+	assert(id == TSP_IRQ_SEC_PHY_TIMER);
+	tsp_generic_timer_handler();
+	plat_ic_end_of_interrupt(id);
+
+	/* Update the statistics and print some messages */
+	tsp_stats[linear_id].sel1_intr_count++;
+	VERBOSE("TSP: cpu 0x%lx handled S-EL1 interrupt %d\n",
+	       read_mpidr(), id);
+	VERBOSE("TSP: cpu 0x%lx: %d S-EL1 requests\n",
+	     read_mpidr(), tsp_stats[linear_id].sel1_intr_count);
+	return 0;
+}