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IB/hfi1: Fix infinite loop in 8051 command error path

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When an 8051 command times out, the entire DC block is restarted. During
the restart, the host interface version bit is set, which calls
do_8051_command() recursively. The host version bit needs to be set
before the link moves into polling, so the host version bit can be set
in set_local_link_attributes() instead. Thus, the 8051 command functions
can be simplied as a non-locking version (dd->dc8051_lock) of those
functions are no longer needed.

Fixes: 9be6a5d788 ("IB/hfi1: Prevent LNI out of sync by resetting host interface version")
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Sebastian Sanchez <sebastian.sanchez@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Sebastian Sanchez 2017-12-18 19:56:59 -08:00 committed by Doug Ledford
parent f5b53b0434
commit 9996b049f6
3 changed files with 46 additions and 102 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

82
drivers/infiniband/hw/hfi1/chip.c
View File

@ -6518,11 +6518,12 @@ static void _dc_start(struct hfi1_devdata *dd)
if (!dd->dc_shutdown)
return;
/*
* Take the 8051 out of reset, wait until 8051 is ready, and set host
* version bit.
*/
release_and_wait_ready_8051_firmware(dd);
/* Take the 8051 out of reset */
write_csr(dd, DC_DC8051_CFG_RST, 0ull);
/* Wait until 8051 is ready */
if (wait_fm_ready(dd, TIMEOUT_8051_START))
dd_dev_err(dd, "%s: timeout starting 8051 firmware\n",
__func__);
/* Take away reset for LCB and RX FPE (set in lcb_shutdown). */
write_csr(dd, DCC_CFG_RESET, 0x10);
@ -8564,23 +8565,27 @@ int write_lcb_csr(struct hfi1_devdata *dd, u32 addr, u64 data)
}
/*
* If the 8051 is in reset mode (dd->dc_shutdown == 1), this function
* will still continue executing.
*
* Returns:
* < 0 = Linux error, not able to get access
* > 0 = 8051 command RETURN_CODE
*/
static int _do_8051_command(struct hfi1_devdata *dd, u32 type, u64 in_data,
u64 *out_data)
static int do_8051_command(struct hfi1_devdata *dd, u32 type, u64 in_data,
u64 *out_data)
{
u64 reg, completed;
int return_code;
unsigned long timeout;
lockdep_assert_held(&dd->dc8051_lock);
hfi1_cdbg(DC8051, "type %d, data 0x%012llx", type, in_data);
mutex_lock(&dd->dc8051_lock);
/* We can't send any commands to the 8051 if it's in reset */
if (dd->dc_shutdown) {
return_code = -ENODEV;
goto fail;
}
/*
* If an 8051 host command timed out previously, then the 8051 is
* stuck.
@ -8680,29 +8685,6 @@ static int _do_8051_command(struct hfi1_devdata *dd, u32 type, u64 in_data,
*/
write_csr(dd, DC_DC8051_CFG_HOST_CMD_0, 0);
fail:
return return_code;
}
/*
* Returns:
* < 0 = Linux error, not able to get access
* > 0 = 8051 command RETURN_CODE
*/
static int do_8051_command(struct hfi1_devdata *dd, u32 type, u64 in_data,
u64 *out_data)
{
int return_code;
mutex_lock(&dd->dc8051_lock);
/* We can't send any commands to the 8051 if it's in reset */
if (dd->dc_shutdown) {
return_code = -ENODEV;
goto fail;
}
return_code = _do_8051_command(dd, type, in_data, out_data);
fail:
mutex_unlock(&dd->dc8051_lock);
return return_code;
@ -8713,17 +8695,16 @@ static int set_physical_link_state(struct hfi1_devdata *dd, u64 state)
return do_8051_command(dd, HCMD_CHANGE_PHY_STATE, state, NULL);
}
static int _load_8051_config(struct hfi1_devdata *dd, u8 field_id,
u8 lane_id, u32 config_data)
int load_8051_config(struct hfi1_devdata *dd, u8 field_id,
u8 lane_id, u32 config_data)
{
u64 data;
int ret;
lockdep_assert_held(&dd->dc8051_lock);
data = (u64)field_id << LOAD_DATA_FIELD_ID_SHIFT
| (u64)lane_id << LOAD_DATA_LANE_ID_SHIFT
| (u64)config_data << LOAD_DATA_DATA_SHIFT;
ret = _do_8051_command(dd, HCMD_LOAD_CONFIG_DATA, data, NULL);
ret = do_8051_command(dd, HCMD_LOAD_CONFIG_DATA, data, NULL);
if (ret != HCMD_SUCCESS) {
dd_dev_err(dd,
"load 8051 config: field id %d, lane %d, err %d\n",
@ -8732,18 +8713,6 @@ static int _load_8051_config(struct hfi1_devdata *dd, u8 field_id,
return ret;
}
int load_8051_config(struct hfi1_devdata *dd, u8 field_id,
u8 lane_id, u32 config_data)
{
int return_code;
mutex_lock(&dd->dc8051_lock);
return_code = _load_8051_config(dd, field_id, lane_id, config_data);
mutex_unlock(&dd->dc8051_lock);
return return_code;
}
/*
* Read the 8051 firmware "registers". Use the RAM directly. Always
* set the result, even on error.
@ -8859,14 +8828,13 @@ int write_host_interface_version(struct hfi1_devdata *dd, u8 version)
u32 frame;
u32 mask;
lockdep_assert_held(&dd->dc8051_lock);
mask = (HOST_INTERFACE_VERSION_MASK << HOST_INTERFACE_VERSION_SHIFT);
read_8051_config(dd, RESERVED_REGISTERS, GENERAL_CONFIG, &frame);
/* Clear, then set field */
frame &= ~mask;
frame |= ((u32)version << HOST_INTERFACE_VERSION_SHIFT);
return _load_8051_config(dd, RESERVED_REGISTERS, GENERAL_CONFIG,
frame);
return load_8051_config(dd, RESERVED_REGISTERS, GENERAL_CONFIG,
frame);
}
void read_misc_status(struct hfi1_devdata *dd, u8 *ver_major, u8 *ver_minor,
@ -9270,6 +9238,14 @@ static int set_local_link_attributes(struct hfi1_pportdata *ppd)
if (ret != HCMD_SUCCESS)
goto set_local_link_attributes_fail;
ret = write_host_interface_version(dd, HOST_INTERFACE_VERSION);
if (ret != HCMD_SUCCESS) {
dd_dev_err(dd,
"Failed to set host interface version, return 0x%x\n",
ret);
goto set_local_link_attributes_fail;
}
/*
* DC supports continuous updates.
*/

2
drivers/infiniband/hw/hfi1/chip.h
View File

@ -508,6 +508,7 @@
#define DOWN_REMOTE_REASON_SHIFT 16
#define DOWN_REMOTE_REASON_MASK 0xff
#define HOST_INTERFACE_VERSION 1
#define HOST_INTERFACE_VERSION_SHIFT 16
#define HOST_INTERFACE_VERSION_MASK 0xff
@ -713,7 +714,6 @@ void read_misc_status(struct hfi1_devdata *dd, u8 *ver_major, u8 *ver_minor,
u8 *ver_patch);
int write_host_interface_version(struct hfi1_devdata *dd, u8 version);
void read_guid(struct hfi1_devdata *dd);
int release_and_wait_ready_8051_firmware(struct hfi1_devdata *dd);
int wait_fm_ready(struct hfi1_devdata *dd, u32 mstimeout);
void set_link_down_reason(struct hfi1_pportdata *ppd, u8 lcl_reason,
u8 neigh_reason, u8 rem_reason);

64
drivers/infiniband/hw/hfi1/firmware.c
View File

@ -68,7 +68,6 @@
#define ALT_FW_FABRIC_NAME "hfi1_fabric_d.fw"
#define ALT_FW_SBUS_NAME "hfi1_sbus_d.fw"
#define ALT_FW_PCIE_NAME "hfi1_pcie_d.fw"
#define HOST_INTERFACE_VERSION 1
MODULE_FIRMWARE(DEFAULT_FW_8051_NAME_ASIC);
MODULE_FIRMWARE(DEFAULT_FW_FABRIC_NAME);
@ -975,46 +974,6 @@ int wait_fm_ready(struct hfi1_devdata *dd, u32 mstimeout)
}
}
/*
* Clear all reset bits, releasing the 8051.
* Wait for firmware to be ready to accept host requests.
* Then, set host version bit.
*
* This function executes even if the 8051 is in reset mode when
* dd->dc_shutdown == 1.
*
* Expects dd->dc8051_lock to be held.
*/
int release_and_wait_ready_8051_firmware(struct hfi1_devdata *dd)
{
int ret;
lockdep_assert_held(&dd->dc8051_lock);
/* clear all reset bits, releasing the 8051 */
write_csr(dd, DC_DC8051_CFG_RST, 0ull);
/*
* Wait for firmware to be ready to accept host
* requests.
*/
ret = wait_fm_ready(dd, TIMEOUT_8051_START);
if (ret) {
dd_dev_err(dd, "8051 start timeout, current FW state 0x%x\n",
get_firmware_state(dd));
return ret;
}
ret = write_host_interface_version(dd, HOST_INTERFACE_VERSION);
if (ret != HCMD_SUCCESS) {
dd_dev_err(dd,
"Failed to set host interface version, return 0x%x\n",
ret);
return -EIO;
}
return 0;
}
/*
* Load the 8051 firmware.
*/
@ -1080,22 +1039,31 @@ static int load_8051_firmware(struct hfi1_devdata *dd,
if (ret)
return ret;
/* clear all reset bits, releasing the 8051 */
write_csr(dd, DC_DC8051_CFG_RST, 0ull);
/*
* Clear all reset bits, releasing the 8051.
* DC reset step 5. Wait for firmware to be ready to accept host
* requests.
* Then, set host version bit.
*/
mutex_lock(&dd->dc8051_lock);
ret = release_and_wait_ready_8051_firmware(dd);
mutex_unlock(&dd->dc8051_lock);
if (ret)
return ret;
ret = wait_fm_ready(dd, TIMEOUT_8051_START);
if (ret) { /* timed out */
dd_dev_err(dd, "8051 start timeout, current state 0x%x\n",
get_firmware_state(dd));
return -ETIMEDOUT;
}
read_misc_status(dd, &ver_major, &ver_minor, &ver_patch);
dd_dev_info(dd, "8051 firmware version %d.%d.%d\n",
(int)ver_major, (int)ver_minor, (int)ver_patch);
dd->dc8051_ver = dc8051_ver(ver_major, ver_minor, ver_patch);
ret = write_host_interface_version(dd, HOST_INTERFACE_VERSION);
if (ret != HCMD_SUCCESS) {
dd_dev_err(dd,
"Failed to set host interface version, return 0x%x\n",
ret);
return -EIO;
}
return 0;
}