diff options
Diffstat (limited to 'drivers/platform/mellanox/mlxbf-bootctl.c')
| -rw-r--r-- | drivers/platform/mellanox/mlxbf-bootctl.c | 144 |
1 files changed, 142 insertions, 2 deletions
diff --git a/drivers/platform/mellanox/mlxbf-bootctl.c b/drivers/platform/mellanox/mlxbf-bootctl.c index 1bad1d278672..fb9f7815c6cd 100644 --- a/drivers/platform/mellanox/mlxbf-bootctl.c +++ b/drivers/platform/mellanox/mlxbf-bootctl.c @@ -11,6 +11,7 @@ #include <linux/acpi.h> #include <linux/arm-smccc.h> #include <linux/delay.h> +#include <linux/iopoll.h> #include <linux/module.h> #include <linux/platform_device.h> @@ -45,10 +46,39 @@ static const char * const mlxbf_bootctl_lifecycle_states[] = { [3] = "RMA", }; +/* Log header format. */ +#define MLXBF_RSH_LOG_TYPE_MASK GENMASK_ULL(59, 56) +#define MLXBF_RSH_LOG_LEN_MASK GENMASK_ULL(54, 48) +#define MLXBF_RSH_LOG_LEVEL_MASK GENMASK_ULL(7, 0) + +/* Log module ID and type (only MSG type in Linux driver for now). */ +#define MLXBF_RSH_LOG_TYPE_MSG 0x04ULL + +/* Log ctl/data register offset. */ +#define MLXBF_RSH_SCRATCH_BUF_CTL_OFF 0 +#define MLXBF_RSH_SCRATCH_BUF_DATA_OFF 0x10 + +/* Log message levels. */ +enum { + MLXBF_RSH_LOG_INFO, + MLXBF_RSH_LOG_WARN, + MLXBF_RSH_LOG_ERR, + MLXBF_RSH_LOG_ASSERT +}; + /* Mapped pointer for RSH_BOOT_FIFO_DATA and RSH_BOOT_FIFO_COUNT register. */ static void __iomem *mlxbf_rsh_boot_data; static void __iomem *mlxbf_rsh_boot_cnt; +/* Mapped pointer for rsh log semaphore/ctrl/data register. */ +static void __iomem *mlxbf_rsh_semaphore; +static void __iomem *mlxbf_rsh_scratch_buf_ctl; +static void __iomem *mlxbf_rsh_scratch_buf_data; + +/* Rsh log levels. */ +static const char * const mlxbf_rsh_log_level[] = { + "INFO", "WARN", "ERR", "ASSERT"}; + /* ARM SMC call which is atomic and no need for lock. */ static int mlxbf_bootctl_smc(unsigned int smc_op, int smc_arg) { @@ -266,12 +296,108 @@ static ssize_t fw_reset_store(struct device *dev, return count; } +/* Size(8-byte words) of the log buffer. */ +#define RSH_SCRATCH_BUF_CTL_IDX_MASK 0x7f + +/* 100ms timeout */ +#define RSH_SCRATCH_BUF_POLL_TIMEOUT 100000 + +static int mlxbf_rsh_log_sem_lock(void) +{ + unsigned long reg; + + return readq_poll_timeout(mlxbf_rsh_semaphore, reg, !reg, 0, + RSH_SCRATCH_BUF_POLL_TIMEOUT); +} + +static void mlxbf_rsh_log_sem_unlock(void) +{ + writeq(0, mlxbf_rsh_semaphore); +} + +static ssize_t rsh_log_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int rc, idx, num, len, level = MLXBF_RSH_LOG_INFO; + size_t size = count; + u64 data; + + if (!size) + return -EINVAL; + + if (!mlxbf_rsh_semaphore || !mlxbf_rsh_scratch_buf_ctl) + return -EOPNOTSUPP; + + /* Ignore line break at the end. */ + if (buf[size - 1] == '\n') + size--; + + /* Check the message prefix. */ + for (idx = 0; idx < ARRAY_SIZE(mlxbf_rsh_log_level); idx++) { + len = strlen(mlxbf_rsh_log_level[idx]); + if (len + 1 < size && + !strncmp(buf, mlxbf_rsh_log_level[idx], len)) { + buf += len; + size -= len; + level = idx; + break; + } + } + + /* Ignore leading spaces. */ + while (size > 0 && buf[0] == ' ') { + size--; + buf++; + } + + /* Take the semaphore. */ + rc = mlxbf_rsh_log_sem_lock(); + if (rc) + return rc; + + /* Calculate how many words are available. */ + idx = readq(mlxbf_rsh_scratch_buf_ctl); + num = min((int)DIV_ROUND_UP(size, sizeof(u64)), + RSH_SCRATCH_BUF_CTL_IDX_MASK - idx - 1); + if (num <= 0) + goto done; + + /* Write Header. */ + data = FIELD_PREP(MLXBF_RSH_LOG_TYPE_MASK, MLXBF_RSH_LOG_TYPE_MSG); + data |= FIELD_PREP(MLXBF_RSH_LOG_LEN_MASK, num); + data |= FIELD_PREP(MLXBF_RSH_LOG_LEVEL_MASK, level); + writeq(data, mlxbf_rsh_scratch_buf_data); + + /* Write message. */ + for (idx = 0; idx < num && size > 0; idx++) { + if (size < sizeof(u64)) { + data = 0; + memcpy(&data, buf, size); + size = 0; + } else { + memcpy(&data, buf, sizeof(u64)); + size -= sizeof(u64); + buf += sizeof(u64); + } + writeq(data, mlxbf_rsh_scratch_buf_data); + } + +done: + /* Release the semaphore. */ + mlxbf_rsh_log_sem_unlock(); + + /* Ignore the rest if no more space. */ + return count; +} + static DEVICE_ATTR_RW(post_reset_wdog); static DEVICE_ATTR_RW(reset_action); static DEVICE_ATTR_RW(second_reset_action); static DEVICE_ATTR_RO(lifecycle_state); static DEVICE_ATTR_RO(secure_boot_fuse_state); static DEVICE_ATTR_WO(fw_reset); +static DEVICE_ATTR_WO(rsh_log); static struct attribute *mlxbf_bootctl_attrs[] = { &dev_attr_post_reset_wdog.attr, @@ -280,6 +406,7 @@ static struct attribute *mlxbf_bootctl_attrs[] = { &dev_attr_lifecycle_state.attr, &dev_attr_secure_boot_fuse_state.attr, &dev_attr_fw_reset.attr, + &dev_attr_rsh_log.attr, NULL }; @@ -345,19 +472,32 @@ static bool mlxbf_bootctl_guid_match(const guid_t *guid, static int mlxbf_bootctl_probe(struct platform_device *pdev) { struct arm_smccc_res res = { 0 }; + void __iomem *reg; guid_t guid; int ret; - /* Get the resource of the bootfifo data register. */ + /* Map the resource of the bootfifo data register. */ mlxbf_rsh_boot_data = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(mlxbf_rsh_boot_data)) return PTR_ERR(mlxbf_rsh_boot_data); - /* Get the resource of the bootfifo counter register. */ + /* Map the resource of the bootfifo counter register. */ mlxbf_rsh_boot_cnt = devm_platform_ioremap_resource(pdev, 1); if (IS_ERR(mlxbf_rsh_boot_cnt)) return PTR_ERR(mlxbf_rsh_boot_cnt); + /* Map the resource of the rshim semaphore register. */ + mlxbf_rsh_semaphore = devm_platform_ioremap_resource(pdev, 2); + if (IS_ERR(mlxbf_rsh_semaphore)) + return PTR_ERR(mlxbf_rsh_semaphore); + + /* Map the resource of the scratch buffer (log) registers. */ + reg = devm_platform_ioremap_resource(pdev, 3); + if (IS_ERR(reg)) + return PTR_ERR(reg); + mlxbf_rsh_scratch_buf_ctl = reg + MLXBF_RSH_SCRATCH_BUF_CTL_OFF; + mlxbf_rsh_scratch_buf_data = reg + MLXBF_RSH_SCRATCH_BUF_DATA_OFF; + /* Ensure we have the UUID we expect for this service. */ arm_smccc_smc(MLXBF_BOOTCTL_SIP_SVC_UID, 0, 0, 0, 0, 0, 0, 0, &res); guid_parse(mlxbf_bootctl_svc_uuid_str, &guid); |