linux_dsm_epyc7002/drivers/net/ethernet/mellanox/mlx4/crdump.c
Alex Vesker 3c641ba4a8 net/mlx4_core: Use devlink region_snapshot parameter
This parameter enables capturing region snapshot of the crspace
during critical errors. The default value of this parameter is
disabled, it can be enabled using devlink param commands.
It is possible to configure during runtime and also driver init.

Signed-off-by: Alex Vesker <valex@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Moshe Shemesh <moshe@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-12 17:37:13 -07:00

240 lines
7.1 KiB
C

/*
* Copyright (c) 2018, Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "mlx4.h"
#define BAD_ACCESS 0xBADACCE5
#define HEALTH_BUFFER_SIZE 0x40
#define CR_ENABLE_BIT swab32(BIT(6))
#define CR_ENABLE_BIT_OFFSET 0xF3F04
#define MAX_NUM_OF_DUMPS_TO_STORE (8)
static const char *region_cr_space_str = "cr-space";
static const char *region_fw_health_str = "fw-health";
/* Set to true in case cr enable bit was set to true before crdump */
static bool crdump_enbale_bit_set;
static void crdump_enable_crspace_access(struct mlx4_dev *dev,
u8 __iomem *cr_space)
{
/* Get current enable bit value */
crdump_enbale_bit_set =
readl(cr_space + CR_ENABLE_BIT_OFFSET) & CR_ENABLE_BIT;
/* Enable FW CR filter (set bit6 to 0) */
if (crdump_enbale_bit_set)
writel(readl(cr_space + CR_ENABLE_BIT_OFFSET) & ~CR_ENABLE_BIT,
cr_space + CR_ENABLE_BIT_OFFSET);
/* Enable block volatile crspace accesses */
writel(swab32(1), cr_space + dev->caps.health_buffer_addrs +
HEALTH_BUFFER_SIZE);
}
static void crdump_disable_crspace_access(struct mlx4_dev *dev,
u8 __iomem *cr_space)
{
/* Disable block volatile crspace accesses */
writel(0, cr_space + dev->caps.health_buffer_addrs +
HEALTH_BUFFER_SIZE);
/* Restore FW CR filter value (set bit6 to original value) */
if (crdump_enbale_bit_set)
writel(readl(cr_space + CR_ENABLE_BIT_OFFSET) | CR_ENABLE_BIT,
cr_space + CR_ENABLE_BIT_OFFSET);
}
static void mlx4_crdump_collect_crspace(struct mlx4_dev *dev,
u8 __iomem *cr_space,
u32 id)
{
struct mlx4_fw_crdump *crdump = &dev->persist->crdump;
struct pci_dev *pdev = dev->persist->pdev;
unsigned long cr_res_size;
u8 *crspace_data;
int offset;
int err;
if (!crdump->region_crspace) {
mlx4_err(dev, "crdump: cr-space region is NULL\n");
return;
}
/* Try to collect CR space */
cr_res_size = pci_resource_len(pdev, 0);
crspace_data = kvmalloc(cr_res_size, GFP_KERNEL);
if (crspace_data) {
for (offset = 0; offset < cr_res_size; offset += 4)
*(u32 *)(crspace_data + offset) =
readl(cr_space + offset);
err = devlink_region_snapshot_create(crdump->region_crspace,
cr_res_size, crspace_data,
id, &kvfree);
if (err) {
kvfree(crspace_data);
mlx4_warn(dev, "crdump: devlink create %s snapshot id %d err %d\n",
region_cr_space_str, id, err);
} else {
mlx4_info(dev, "crdump: added snapshot %d to devlink region %s\n",
id, region_cr_space_str);
}
} else {
mlx4_err(dev, "crdump: Failed to allocate crspace buffer\n");
}
}
static void mlx4_crdump_collect_fw_health(struct mlx4_dev *dev,
u8 __iomem *cr_space,
u32 id)
{
struct mlx4_fw_crdump *crdump = &dev->persist->crdump;
u8 *health_data;
int offset;
int err;
if (!crdump->region_fw_health) {
mlx4_err(dev, "crdump: fw-health region is NULL\n");
return;
}
/* Try to collect health buffer */
health_data = kvmalloc(HEALTH_BUFFER_SIZE, GFP_KERNEL);
if (health_data) {
u8 __iomem *health_buf_start =
cr_space + dev->caps.health_buffer_addrs;
for (offset = 0; offset < HEALTH_BUFFER_SIZE; offset += 4)
*(u32 *)(health_data + offset) =
readl(health_buf_start + offset);
err = devlink_region_snapshot_create(crdump->region_fw_health,
HEALTH_BUFFER_SIZE,
health_data,
id, &kvfree);
if (err) {
kvfree(health_data);
mlx4_warn(dev, "crdump: devlink create %s snapshot id %d err %d\n",
region_fw_health_str, id, err);
} else {
mlx4_info(dev, "crdump: added snapshot %d to devlink region %s\n",
id, region_fw_health_str);
}
} else {
mlx4_err(dev, "crdump: Failed to allocate health buffer\n");
}
}
int mlx4_crdump_collect(struct mlx4_dev *dev)
{
struct devlink *devlink = priv_to_devlink(mlx4_priv(dev));
struct mlx4_fw_crdump *crdump = &dev->persist->crdump;
struct pci_dev *pdev = dev->persist->pdev;
unsigned long cr_res_size;
u8 __iomem *cr_space;
u32 id;
if (!dev->caps.health_buffer_addrs) {
mlx4_info(dev, "crdump: FW doesn't support health buffer access, skipping\n");
return 0;
}
if (!crdump->snapshot_enable) {
mlx4_info(dev, "crdump: devlink snapshot disabled, skipping\n");
return 0;
}
cr_res_size = pci_resource_len(pdev, 0);
cr_space = ioremap(pci_resource_start(pdev, 0), cr_res_size);
if (!cr_space) {
mlx4_err(dev, "crdump: Failed to map pci cr region\n");
return -ENODEV;
}
crdump_enable_crspace_access(dev, cr_space);
/* Get the available snapshot ID for the dumps */
id = devlink_region_shapshot_id_get(devlink);
/* Try to capture dumps */
mlx4_crdump_collect_crspace(dev, cr_space, id);
mlx4_crdump_collect_fw_health(dev, cr_space, id);
crdump_disable_crspace_access(dev, cr_space);
iounmap(cr_space);
return 0;
}
int mlx4_crdump_init(struct mlx4_dev *dev)
{
struct devlink *devlink = priv_to_devlink(mlx4_priv(dev));
struct mlx4_fw_crdump *crdump = &dev->persist->crdump;
struct pci_dev *pdev = dev->persist->pdev;
crdump->snapshot_enable = false;
/* Create cr-space region */
crdump->region_crspace =
devlink_region_create(devlink,
region_cr_space_str,
MAX_NUM_OF_DUMPS_TO_STORE,
pci_resource_len(pdev, 0));
if (IS_ERR(crdump->region_crspace))
mlx4_warn(dev, "crdump: create devlink region %s err %ld\n",
region_cr_space_str,
PTR_ERR(crdump->region_crspace));
/* Create fw-health region */
crdump->region_fw_health =
devlink_region_create(devlink,
region_fw_health_str,
MAX_NUM_OF_DUMPS_TO_STORE,
HEALTH_BUFFER_SIZE);
if (IS_ERR(crdump->region_fw_health))
mlx4_warn(dev, "crdump: create devlink region %s err %ld\n",
region_fw_health_str,
PTR_ERR(crdump->region_fw_health));
return 0;
}
void mlx4_crdump_end(struct mlx4_dev *dev)
{
struct mlx4_fw_crdump *crdump = &dev->persist->crdump;
devlink_region_destroy(crdump->region_fw_health);
devlink_region_destroy(crdump->region_crspace);
}