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habanalabs/gaudi: use COMMS to reset device / halt CPU

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This is needed because legacy FW 'communication' protocol will soon
become obsolete.
Because COMMS is a boot protocol, communicating through it is supported
only until Linux is loaded to the device CPU, where in that case we
will fallback to the former implementation.

Signed-off-by: Koby Elbaz <kelbaz@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
This commit is contained in:
Koby Elbaz
2021-05-20 12:45:58 +03:00
committed by Oded Gabbay
parent 3649eaea27
commit 4080308e33
3 changed files with 39 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/misc/habanalabs/common/firmware_if.c
View File

@@ -1390,7 +1390,7 @@ static int hl_fw_dynamic_send_clear_cmd(struct hl_device *hdev,
* leftovers between command
* NOOP command: necessary to avoid loop on the clear command by the FW
*/
static int hl_fw_dynamic_send_protocol_cmd(struct hl_device *hdev,
int hl_fw_dynamic_send_protocol_cmd(struct hl_device *hdev,
struct fw_load_mgr *fw_loader,
enum comms_cmd cmd, unsigned int size,
bool wait_ok, u32 timeout)

5
drivers/misc/habanalabs/common/habanalabs.h
View File

@@ -2574,7 +2574,10 @@ int hl_fw_read_preboot_status(struct hl_device *hdev, u32 cpu_boot_status_reg,
u32 sts_boot_dev_sts0_reg,
u32 sts_boot_dev_sts1_reg, u32 boot_err0_reg,
u32 boot_err1_reg, u32 timeout);
int hl_fw_dynamic_send_protocol_cmd(struct hl_device *hdev,
struct fw_load_mgr *fw_loader,
enum comms_cmd cmd, unsigned int size,
bool wait_ok, u32 timeout);
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);

36
drivers/misc/habanalabs/gaudi/gaudi.c
View File

@@ -1931,6 +1931,38 @@ static void gaudi_disable_msi(struct hl_device *hdev)
gaudi->hw_cap_initialized &= ~HW_CAP_MSI;
}
static void gaudi_fw_hard_reset(struct hl_device *hdev)
{
int rc;
if (hdev->asic_prop.dynamic_fw_load && !hdev->fw_loader.linux_loaded) {
rc = hl_fw_dynamic_send_protocol_cmd(hdev, &hdev->fw_loader,
COMMS_RST_DEV, 0, false,
hdev->fw_loader.cpu_timeout);
if (rc)
dev_warn(hdev->dev, "Failed sending COMMS_RST_DEV\n");
} else {
WREG32(mmPSOC_GLOBAL_CONF_KMD_MSG_TO_CPU, KMD_MSG_RST_DEV);
}
}
static void gaudi_fw_halt_cpu(struct hl_device *hdev)
{
int rc;
/* Stop device CPU to make sure nothing bad happens */
if (hdev->asic_prop.dynamic_fw_load && !hdev->fw_loader.linux_loaded) {
rc = hl_fw_dynamic_send_protocol_cmd(hdev, &hdev->fw_loader,
COMMS_GOTO_WFE, 0, true,
hdev->fw_loader.cpu_timeout);
if (rc)
dev_warn(hdev->dev, "Failed sending COMMS_GOTO_WFE\n");
} else {
WREG32(mmPSOC_GLOBAL_CONF_KMD_MSG_TO_CPU, KMD_MSG_GOTO_WFE);
msleep(GAUDI_CPU_RESET_WAIT_MSEC);
}
}
static void gaudi_init_scrambler_sram(struct hl_device *hdev)
{
struct gaudi_device *gaudi = hdev->asic_specific;
@@ -4106,9 +4138,9 @@ static void gaudi_hw_fini(struct hl_device *hdev, bool hard_reset)
* stopped in any means necessary
*/
if (hdev->asic_prop.hard_reset_done_by_fw)
WREG32(mmPSOC_GLOBAL_CONF_KMD_MSG_TO_CPU, KMD_MSG_RST_DEV);
gaudi_fw_hard_reset(hdev);
else
WREG32(mmPSOC_GLOBAL_CONF_KMD_MSG_TO_CPU, KMD_MSG_GOTO_WFE);
gaudi_fw_halt_cpu(hdev);
if (hdev->fw_loader.linux_loaded) {
irq_handler_offset = hdev->asic_prop.gic_interrupts_enable ?