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net/mlx5: Extract MTCTR register read logic into helper function

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Refactor the MTCTR register reading logic into a dedicated helper to
lay the groundwork for the next patch.

Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/1755008228-88881-3-git-send-email-tariqt@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Carolina Jubran 2025-08-12 17:17:07 +03:00 committed by Paolo Abeni
parent faf23f54d3
commit 96c345c3c5
1 changed files with 27 additions and 12 deletions
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39
drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
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@ -247,27 +247,24 @@ static bool mlx5_is_ptm_source_time_available(struct mlx5_core_dev *dev)
return !!MLX5_GET(mtptm_reg, out, psta);
}
static int mlx5_mtctr_syncdevicetime(ktime_t *device_time,
struct system_counterval_t *sys_counterval,
void *ctx)
static int mlx5_mtctr_read(struct mlx5_core_dev *mdev,
bool real_time_mode,
struct system_counterval_t *sys_counterval,
u64 *device)
{
u32 out[MLX5_ST_SZ_DW(mtctr_reg)] = {0};
u32 in[MLX5_ST_SZ_DW(mtctr_reg)] = {0};
struct mlx5_core_dev *mdev = ctx;
bool real_time_mode;
u64 host, device;
u64 host;
int err;
real_time_mode = mlx5_real_time_mode(mdev);
MLX5_SET(mtctr_reg, in, first_clock_timestamp_request,
MLX5_MTCTR_REQUEST_PTM_ROOT_CLOCK);
MLX5_SET(mtctr_reg, in, second_clock_timestamp_request,
real_time_mode ? MLX5_MTCTR_REQUEST_REAL_TIME_CLOCK :
MLX5_MTCTR_REQUEST_FREE_RUNNING_COUNTER);
MLX5_MTCTR_REQUEST_FREE_RUNNING_COUNTER);
err = mlx5_core_access_reg(mdev, in, sizeof(in), out, sizeof(out), MLX5_REG_MTCTR,
0, 0);
err = mlx5_core_access_reg(mdev, in, sizeof(in), out, sizeof(out),
MLX5_REG_MTCTR, 0, 0);
if (err)
return err;
@ -281,8 +278,26 @@ static int mlx5_mtctr_syncdevicetime(ktime_t *device_time,
.cs_id = CSID_X86_ART,
.use_nsecs = true,
};
*device = MLX5_GET64(mtctr_reg, out, second_clock_timestamp);
return 0;
}
static int mlx5_mtctr_syncdevicetime(ktime_t *device_time,
struct system_counterval_t *sys_counterval,
void *ctx)
{
struct mlx5_core_dev *mdev = ctx;
bool real_time_mode;
u64 device;
int err;
real_time_mode = mlx5_real_time_mode(mdev);
err = mlx5_mtctr_read(mdev, real_time_mode, sys_counterval, &device);
if (err)
return err;
device = MLX5_GET64(mtctr_reg, out, second_clock_timestamp);
if (real_time_mode)
*device_time = ns_to_ktime(REAL_TIME_TO_NS(device >> 32, device & U32_MAX));
else