sw:kernel: pause the CPU on dump

If we want to use DUMP to inspect the firmware status at a given moment in time we must stop the code execution so that nothing change while the driver extracts the data. Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

sw:kernel: pause the CPU on dump
If we want to use DUMP to inspect the firmware status at a given moment in time we must stop the code execution so that nothing change while the driver extracts the data. Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
49239d14 · Federico Vaga · ed718e60 · 49239d14
Commit 49239d14 authored Mar 24, 2017 by Federico Vaga
Hide whitespace changes
Inline Side-by-side

Showing with 8 additions and 1 deletion

mockturtle-cpu.c kernel/mockturtle-cpu.c +8 -1

No files found.
--- a/kernel/mockturtle-cpu.c
+++ b/kernel/mockturtle-cpu.c
@@ -239,7 +239,7 @@ static int trtl_cpu_firmware_dump(struct trtl_cpu *cpu, void *fw_buf,
 				  size_t count, loff_t off)
 {
 	struct trtl_dev *trtl = to_trtl_dev(cpu->dev.parent);
-	uint32_t *fw = fw_buf, word;
+	uint32_t *fw = fw_buf, word, enable;
 	int size, offset, i, cpu_memsize;
@@ -258,6 +258,10 @@ static int trtl_cpu_firmware_dump(struct trtl_cpu *cpu, void *fw_buf,
 		return -ENOMEM;
 	}
+	/* Stop the CPU before dumping its memory */
+	enable = trtl_ioread(trtl, trtl->base_csr + WRN_CPU_CSR_REG_ENABLE);
+	trtl_cpu_enable_set(trtl, (1 << cpu->index));
 	/* Dump the firmware */
 	for (i = 0; i < size; ++i) {
 		trtl_iowrite(trtl, i + offset,
@@ -268,6 +272,9 @@ static int trtl_cpu_firmware_dump(struct trtl_cpu *cpu, void *fw_buf,
 		fw[i] = be32_to_cpu(word);
 	}
+	/* Restore the previous enable status */
+	trtl_iowrite(trtl, enable, trtl->base_csr + WRN_CPU_CSR_REG_ENABLE);
 	return 0;
 }