[PATCH 05/10] accel/habanalabs: do soft-reset using cpucp packet

[Oded Gabbay]

From: Dafna Hirschfeld <dhirschfeld at habana.ai>

This is done depending on the FW version. The cpucp method is
preferable and saves scratchpads resource.

Signed-off-by: Dafna Hirschfeld <dhirschfeld at habana.ai>
Reviewed-by: Oded Gabbay <ogabbay at kernel.org>
Signed-off-by: Oded Gabbay <ogabbay at kernel.org>
---
 drivers/accel/habanalabs/common/firmware_if.c | 14 ++++++++++
 drivers/accel/habanalabs/common/habanalabs.h  |  1 +
 drivers/accel/habanalabs/gaudi2/gaudi2.c      | 26 ++++++++++++-------
 .../habanalabs/include/common/cpucp_if.h      |  4 +++
 4 files changed, 35 insertions(+), 10 deletions(-)

diff --git a/drivers/accel/habanalabs/common/firmware_if.c b/drivers/accel/habanalabs/common/firmware_if.c
index 62052cfe694f..e48f024d8649 100644
--- a/drivers/accel/habanalabs/common/firmware_if.c
+++ b/drivers/accel/habanalabs/common/firmware_if.c
@@ -591,6 +591,20 @@ void hl_fw_cpu_accessible_dma_pool_free(struct hl_device *hdev, size_t size,
 			size);
 }
 
+int hl_fw_send_soft_reset(struct hl_device *hdev)
+{
+	struct cpucp_packet pkt;
+	int rc;
+
+	memset(&pkt, 0, sizeof(pkt));
+	pkt.ctl = cpu_to_le32(CPUCP_PACKET_SOFT_RESET << CPUCP_PKT_CTL_OPCODE_SHIFT);
+	rc = hdev->asic_funcs->send_cpu_message(hdev, (u32 *) &pkt, sizeof(pkt), 0, NULL);
+	if (rc)
+		dev_err(hdev->dev, "failed to send soft-reset msg (err = %d)\n", rc);
+
+	return rc;
+}
+
 int hl_fw_send_device_activity(struct hl_device *hdev, bool open)
 {
 	struct cpucp_packet pkt;
diff --git a/drivers/accel/habanalabs/common/habanalabs.h b/drivers/accel/habanalabs/common/habanalabs.h
index 02620654ccdf..6b102947cb90 100644
--- a/drivers/accel/habanalabs/common/habanalabs.h
+++ b/drivers/accel/habanalabs/common/habanalabs.h
@@ -3884,6 +3884,7 @@ int hl_fw_dram_replaced_row_get(struct hl_device *hdev,
 int hl_fw_dram_pending_row_get(struct hl_device *hdev, u32 *pend_rows_num);
 int hl_fw_cpucp_engine_core_asid_set(struct hl_device *hdev, u32 asid);
 int hl_fw_send_device_activity(struct hl_device *hdev, bool open);
+int hl_fw_send_soft_reset(struct hl_device *hdev);
 int hl_pci_bars_map(struct hl_device *hdev, const char * const name[3],
 			bool is_wc[3]);
 int hl_pci_elbi_read(struct hl_device *hdev, u64 addr, u32 *data);
diff --git a/drivers/accel/habanalabs/gaudi2/gaudi2.c b/drivers/accel/habanalabs/gaudi2/gaudi2.c
index 6e3aa89b19c2..5c80e7af5b78 100644
--- a/drivers/accel/habanalabs/gaudi2/gaudi2.c
+++ b/drivers/accel/habanalabs/gaudi2/gaudi2.c
@@ -6148,18 +6148,24 @@ static int gaudi2_execute_soft_reset(struct hl_device *hdev, bool driver_perform
 						u32 poll_timeout_us)
 {
 	struct cpu_dyn_regs *dyn_regs = &hdev->fw_loader.dynamic_loader.comm_desc.cpu_dyn_regs;
+	int rc = 0;
 
 	if (!driver_performs_reset) {
-		/* set SP to indicate reset request sent to FW */
-		if (dyn_regs->cpu_rst_status)
-			WREG32(le32_to_cpu(dyn_regs->cpu_rst_status), CPU_RST_STATUS_NA);
-		else
-			WREG32(mmCPU_RST_STATUS_TO_HOST, CPU_RST_STATUS_NA);
-
-		WREG32(le32_to_cpu(dyn_regs->gic_host_soft_rst_irq),
-			gaudi2_irq_map_table[GAUDI2_EVENT_CPU_SOFT_RESET].cpu_id);
-
-		return gaudi2_get_soft_rst_done_indication(hdev, poll_timeout_us);
+		if (hl_is_fw_sw_ver_below(hdev, 1, 10)) {
+			/* set SP to indicate reset request sent to FW */
+			if (dyn_regs->cpu_rst_status)
+				WREG32(le32_to_cpu(dyn_regs->cpu_rst_status), CPU_RST_STATUS_NA);
+			else
+				WREG32(mmCPU_RST_STATUS_TO_HOST, CPU_RST_STATUS_NA);
+			WREG32(le32_to_cpu(dyn_regs->gic_host_soft_rst_irq),
+				gaudi2_irq_map_table[GAUDI2_EVENT_CPU_SOFT_RESET].cpu_id);
+
+			/* wait for f/w response */
+			rc = gaudi2_get_soft_rst_done_indication(hdev, poll_timeout_us);
+		} else {
+			rc = hl_fw_send_soft_reset(hdev);
+		}
+		return rc;
 	}
 
 	/* Block access to engines, QMANs and SM during reset, these
diff --git a/drivers/accel/habanalabs/include/common/cpucp_if.h b/drivers/accel/habanalabs/include/common/cpucp_if.h
index 8bbe685458c4..f68308cc2524 100644
--- a/drivers/accel/habanalabs/include/common/cpucp_if.h
+++ b/drivers/accel/habanalabs/include/common/cpucp_if.h
@@ -665,6 +665,9 @@ enum pq_init_status {
  *
  * CPUCP_PACKET_REGISTER_INTERRUPTS -
  *       Packet to register interrupts indicating LKD is ready to receive events from FW.
+ *
+ * CPUCP_PACKET_SOFT_RESET -
+ *	 Packet to perform soft-reset.
  */
 
 enum cpucp_packet_id {
@@ -731,6 +734,7 @@ enum cpucp_packet_id {
 	CPUCP_PACKET_RESERVED11,		/* not used */
 	CPUCP_PACKET_RESERVED12,		/* internal */
 	CPUCP_PACKET_REGISTER_INTERRUPTS,	/* internal */
+	CPUCP_PACKET_SOFT_RESET,		/* internal */
 	CPUCP_PACKET_ID_MAX			/* must be last */
 };
 
-- 
2.40.0