| Message ID | 20210803113134.2262882-14-iwona.winiarska@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Introduce PECI subsystem | expand |
On Tue, Aug 03, 2021 at 01:31:32PM +0200, Iwona Winiarska wrote: > Add peci-dimmtemp driver for Temperature Sensor on DIMM readings that > are accessible via the processor PECI interface. > > The main use case for the driver (and PECI interface) is out-of-band > management, where we're able to obtain thermal readings from an external > entity connected with PECI, e.g. BMC on server platforms. > > Co-developed-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com> > Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com> > Signed-off-by: Iwona Winiarska <iwona.winiarska@intel.com> > Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> > --- > Note that the timeout was completely removed - we're going to probe > for detected DIMMs every 5 seconds until we reach "stable" state of > either getting correct DIMM data or getting all -EINVAL (which > suggest that the CPU doesn't have any DIMMs). > > drivers/hwmon/peci/Kconfig | 13 + > drivers/hwmon/peci/Makefile | 2 + > drivers/hwmon/peci/dimmtemp.c | 614 ++++++++++++++++++++++++++++++++++ > 3 files changed, 629 insertions(+) > create mode 100644 drivers/hwmon/peci/dimmtemp.c > > diff --git a/drivers/hwmon/peci/Kconfig b/drivers/hwmon/peci/Kconfig > index e10eed68d70a..9d32a57badfe 100644 > --- a/drivers/hwmon/peci/Kconfig > +++ b/drivers/hwmon/peci/Kconfig > @@ -14,5 +14,18 @@ config SENSORS_PECI_CPUTEMP > This driver can also be built as a module. If so, the module > will be called peci-cputemp. > > +config SENSORS_PECI_DIMMTEMP > + tristate "PECI DIMM temperature monitoring client" > + depends on PECI > + select SENSORS_PECI > + select PECI_CPU > + help > + If you say yes here you get support for the generic Intel PECI hwmon > + driver which provides Temperature Sensor on DIMM readings that are > + accessible via the processor PECI interface. > + > + This driver can also be built as a module. If so, the module > + will be called peci-dimmtemp. > + > config SENSORS_PECI > tristate > diff --git a/drivers/hwmon/peci/Makefile b/drivers/hwmon/peci/Makefile > index e8a0ada5ab1f..191cfa0227f3 100644 > --- a/drivers/hwmon/peci/Makefile > +++ b/drivers/hwmon/peci/Makefile > @@ -1,5 +1,7 @@ > # SPDX-License-Identifier: GPL-2.0-only > > peci-cputemp-y := cputemp.o > +peci-dimmtemp-y := dimmtemp.o > > obj-$(CONFIG_SENSORS_PECI_CPUTEMP) += peci-cputemp.o > +obj-$(CONFIG_SENSORS_PECI_DIMMTEMP) += peci-dimmtemp.o > diff --git a/drivers/hwmon/peci/dimmtemp.c b/drivers/hwmon/peci/dimmtemp.c > new file mode 100644 > index 000000000000..6264c29bb6c0 > --- /dev/null > +++ b/drivers/hwmon/peci/dimmtemp.c > @@ -0,0 +1,614 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +// Copyright (c) 2018-2021 Intel Corporation > + > +#include <linux/auxiliary_bus.h> > +#include <linux/bitfield.h> > +#include <linux/bitops.h> > +#include <linux/hwmon.h> > +#include <linux/jiffies.h> > +#include <linux/module.h> > +#include <linux/peci.h> > +#include <linux/peci-cpu.h> > +#include <linux/units.h> > +#include <linux/workqueue.h> > +#include <linux/x86/intel-family.h> > + > +#include "common.h" > + > +#define DIMM_MASK_CHECK_DELAY_JIFFIES msecs_to_jiffies(5000) > + > +/* Max number of channel ranks and DIMM index per channel */ > +#define CHAN_RANK_MAX_ON_HSX 8 > +#define DIMM_IDX_MAX_ON_HSX 3 > +#define CHAN_RANK_MAX_ON_BDX 4 > +#define DIMM_IDX_MAX_ON_BDX 3 > +#define CHAN_RANK_MAX_ON_BDXD 2 > +#define DIMM_IDX_MAX_ON_BDXD 2 > +#define CHAN_RANK_MAX_ON_SKX 6 > +#define DIMM_IDX_MAX_ON_SKX 2 > +#define CHAN_RANK_MAX_ON_ICX 8 > +#define DIMM_IDX_MAX_ON_ICX 2 > +#define CHAN_RANK_MAX_ON_ICXD 4 > +#define DIMM_IDX_MAX_ON_ICXD 2 > + > +#define CHAN_RANK_MAX CHAN_RANK_MAX_ON_HSX > +#define DIMM_IDX_MAX DIMM_IDX_MAX_ON_HSX > +#define DIMM_NUMS_MAX (CHAN_RANK_MAX * DIMM_IDX_MAX) > + > +#define CPU_SEG_MASK GENMASK(23, 16) > +#define GET_CPU_SEG(x) (((x) & CPU_SEG_MASK) >> 16) > +#define CPU_BUS_MASK GENMASK(7, 0) > +#define GET_CPU_BUS(x) ((x) & CPU_BUS_MASK) > + > +#define DIMM_TEMP_MAX GENMASK(15, 8) > +#define DIMM_TEMP_CRIT GENMASK(23, 16) > +#define GET_TEMP_MAX(x) (((x) & DIMM_TEMP_MAX) >> 8) > +#define GET_TEMP_CRIT(x) (((x) & DIMM_TEMP_CRIT) >> 16) > + > +struct peci_dimmtemp; > + > +struct dimm_info { > + int chan_rank_max; > + int dimm_idx_max; > + u8 min_peci_revision; > + int (*read_thresholds)(struct peci_dimmtemp *priv, int dimm_order, > + int chan_rank, u32 *data); > +}; > + > +struct peci_dimm_thresholds { > + long temp_max; > + long temp_crit; > + struct peci_sensor_state state; > +}; > + > +enum peci_dimm_threshold_type { > + temp_max_type, > + temp_crit_type, > +}; > + > +struct peci_dimmtemp { > + struct peci_device *peci_dev; > + struct device *dev; > + const char *name; > + const struct dimm_info *gen_info; > + struct delayed_work detect_work; > + struct { > + struct peci_sensor_data temp; > + struct peci_dimm_thresholds thresholds; > + } dimm[DIMM_NUMS_MAX]; > + char **dimmtemp_label; > + DECLARE_BITMAP(dimm_mask, DIMM_NUMS_MAX); > +}; > + > +static u8 __dimm_temp(u32 reg, int dimm_order) > +{ > + return (reg >> (dimm_order * 8)) & 0xff; > +} > + > +static int get_dimm_temp(struct peci_dimmtemp *priv, int dimm_no, long *val) > +{ > + int dimm_order = dimm_no % priv->gen_info->dimm_idx_max; > + int chan_rank = dimm_no / priv->gen_info->dimm_idx_max; > + u32 data; > + int ret; int ret = 0; > + > + mutex_lock(&priv->dimm[dimm_no].temp.state.lock); > + if (!peci_sensor_need_update(&priv->dimm[dimm_no].temp.state)) > + goto skip_update; > + > + ret = peci_pcs_read(priv->peci_dev, PECI_PCS_DDR_DIMM_TEMP, chan_rank, &data); > + if (ret) { > + mutex_unlock(&priv->dimm[dimm_no].temp.state.lock); > + return ret; > + } if (ret) goto unlock; > + > + priv->dimm[dimm_no].temp.value = __dimm_temp(data, dimm_order) * MILLIDEGREE_PER_DEGREE; > + > + peci_sensor_mark_updated(&priv->dimm[dimm_no].temp.state); > + > +skip_update: > + *val = priv->dimm[dimm_no].temp.value; unlock: > + mutex_unlock(&priv->dimm[dimm_no].temp.state.lock); > + return 0; return ret; > +} > + > +static int update_thresholds(struct peci_dimmtemp *priv, int dimm_no) > +{ > + int dimm_order = dimm_no % priv->gen_info->dimm_idx_max; > + int chan_rank = dimm_no / priv->gen_info->dimm_idx_max; > + u32 data; > + int ret; > + > + if (!peci_sensor_need_update(&priv->dimm[dimm_no].thresholds.state)) > + return 0; > + > + ret = priv->gen_info->read_thresholds(priv, dimm_order, chan_rank, &data); > + if (ret == -ENODATA) /* Use default or previous value */ > + return 0; > + if (ret) > + return ret; > + > + priv->dimm[dimm_no].thresholds.temp_max = GET_TEMP_MAX(data) * MILLIDEGREE_PER_DEGREE; > + priv->dimm[dimm_no].thresholds.temp_crit = GET_TEMP_CRIT(data) * MILLIDEGREE_PER_DEGREE; > + > + peci_sensor_mark_updated(&priv->dimm[dimm_no].thresholds.state); > + > + return 0; > +} > + > +static int get_dimm_thresholds(struct peci_dimmtemp *priv, enum peci_dimm_threshold_type type, > + int dimm_no, long *val) > +{ > + int ret; > + > + mutex_lock(&priv->dimm[dimm_no].thresholds.state.lock); > + ret = update_thresholds(priv, dimm_no); > + if (ret) > + goto unlock; > + > + switch (type) { > + case temp_max_type: > + *val = priv->dimm[dimm_no].thresholds.temp_max; > + break; > + case temp_crit_type: > + *val = priv->dimm[dimm_no].thresholds.temp_crit; > + break; > + default: > + ret = -EOPNOTSUPP; > + break; > + } > +unlock: > + mutex_unlock(&priv->dimm[dimm_no].thresholds.state.lock); > + > + return ret; > +} > + > +static int dimmtemp_read_string(struct device *dev, > + enum hwmon_sensor_types type, > + u32 attr, int channel, const char **str) > +{ > + struct peci_dimmtemp *priv = dev_get_drvdata(dev); > + > + if (attr != hwmon_temp_label) > + return -EOPNOTSUPP; > + > + *str = (const char *)priv->dimmtemp_label[channel]; > + > + return 0; > +} > + > +static int dimmtemp_read(struct device *dev, enum hwmon_sensor_types type, > + u32 attr, int channel, long *val) > +{ > + struct peci_dimmtemp *priv = dev_get_drvdata(dev); > + > + switch (attr) { > + case hwmon_temp_input: > + return get_dimm_temp(priv, channel, val); > + case hwmon_temp_max: > + return get_dimm_thresholds(priv, temp_max_type, channel, val); > + case hwmon_temp_crit: > + return get_dimm_thresholds(priv, temp_crit_type, channel, val); > + default: > + break; > + } > + > + return -EOPNOTSUPP; > +} > + > +static umode_t dimmtemp_is_visible(const void *data, enum hwmon_sensor_types type, > + u32 attr, int channel) > +{ > + const struct peci_dimmtemp *priv = data; > + > + if (test_bit(channel, priv->dimm_mask)) > + return 0444; > + > + return 0; > +} > + > +static const struct hwmon_ops peci_dimmtemp_ops = { > + .is_visible = dimmtemp_is_visible, > + .read_string = dimmtemp_read_string, > + .read = dimmtemp_read, > +}; > + > +static int check_populated_dimms(struct peci_dimmtemp *priv) > +{ > + int chan_rank_max = priv->gen_info->chan_rank_max; > + int dimm_idx_max = priv->gen_info->dimm_idx_max; > + u32 chan_rank_empty = 0; > + u64 dimm_mask = 0; > + int chan_rank, dimm_idx, ret; > + u32 pcs; > + > + BUILD_BUG_ON(CHAN_RANK_MAX > 32); > + BUILD_BUG_ON(DIMM_NUMS_MAX > 64); I don't immediately see the value of those build bugs. What happens if CHAN_RANK_MAX > 32 or DIMM_NUMS_MAX > 64 ? Where do those limits come from ? > + if (chan_rank_max * dimm_idx_max > DIMM_NUMS_MAX) { > + WARN_ONCE(1, "Unsupported number of DIMMs"); Maybe display the values (chan_rank_max and dimm_idx_max). > + return -EINVAL; > + } > + > + for (chan_rank = 0; chan_rank < chan_rank_max; chan_rank++) { > + ret = peci_pcs_read(priv->peci_dev, PECI_PCS_DDR_DIMM_TEMP, chan_rank, &pcs); > + if (ret) { > + /* > + * Overall, we expect either success or -EINVAL in > + * order to determine whether DIMM is populated or not. > + * For anything else - we fall back to defering the Why " - " ? > + * detection to be performed at a later point in time. > + */ > + if (ret == -EINVAL) { > + chan_rank_empty |= BIT(chan_rank); > + continue; > + } > + > + return -EAGAIN; > + } > + > + for (dimm_idx = 0; dimm_idx < dimm_idx_max; dimm_idx++) > + if (__dimm_temp(pcs, dimm_idx)) > + dimm_mask |= BIT(chan_rank * dimm_idx_max + dimm_idx); > + } > + > + /* If we got all -EINVALs, it means that the CPU doesn't have any DIMMs. */ > + if (chan_rank_empty == GENMASK(chan_rank_max - 1, 0)) > + return -ENODEV; > + > + /* > + * It's possible that memory training is not done yet. In this case we > + * defer the detection to be performed at a later point in time. > + */ > + if (!dimm_mask) > + return -EAGAIN; > + > + dev_dbg(priv->dev, "Scanned populated DIMMs: %#llx\n", dimm_mask); > + > + bitmap_from_u64(priv->dimm_mask, dimm_mask); > + > + return 0; > +} > + > +static int create_dimm_temp_label(struct peci_dimmtemp *priv, int chan) > +{ > + int rank = chan / priv->gen_info->dimm_idx_max; > + int idx = chan % priv->gen_info->dimm_idx_max; > + > + priv->dimmtemp_label[chan] = devm_kasprintf(priv->dev, GFP_KERNEL, > + "DIMM %c%d", 'A' + rank, > + idx + 1); > + if (!priv->dimmtemp_label[chan]) > + return -ENOMEM; > + > + return 0; > +} > + > +static const u32 peci_dimmtemp_temp_channel_config[] = { > + [0 ... DIMM_NUMS_MAX - 1] = HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT, > + 0 > +}; > + > +static const struct hwmon_channel_info peci_dimmtemp_temp_channel = { > + .type = hwmon_temp, > + .config = peci_dimmtemp_temp_channel_config, > +}; > + > +static const struct hwmon_channel_info *peci_dimmtemp_temp_info[] = { > + &peci_dimmtemp_temp_channel, > + NULL > +}; > + > +static const struct hwmon_chip_info peci_dimmtemp_chip_info = { > + .ops = &peci_dimmtemp_ops, > + .info = peci_dimmtemp_temp_info, > +}; > + > +static int create_dimm_temp_info(struct peci_dimmtemp *priv) > +{ > + int ret, i, channels; > + struct device *dev; > + > + /* > + * We expect to either find populated DIMMs and carry on with creating > + * sensors, or find out that there are no DIMMs populated. > + * All other states mean that the platform never reached the state that > + * allows to check DIMM state - causing us to retry later on. > + */ > + ret = check_populated_dimms(priv); > + if (ret == -ENODEV) { > + dev_dbg(priv->dev, "No DIMMs found\n"); > + return 0; > + } else if (ret) { > + schedule_delayed_work(&priv->detect_work, DIMM_MASK_CHECK_DELAY_JIFFIES); > + dev_dbg(priv->dev, "Deferred populating DIMM temp info\n"); > + return ret; > + } > + > + channels = priv->gen_info->chan_rank_max * priv->gen_info->dimm_idx_max; > + > + priv->dimmtemp_label = devm_kzalloc(priv->dev, channels * sizeof(char *), GFP_KERNEL); > + if (!priv->dimmtemp_label) > + return -ENOMEM; > + > + for_each_set_bit(i, priv->dimm_mask, DIMM_NUMS_MAX) { > + ret = create_dimm_temp_label(priv, i); > + if (ret) > + return ret; > + mutex_init(&priv->dimm[i].thresholds.state.lock); > + mutex_init(&priv->dimm[i].temp.state.lock); > + } > + > + dev = devm_hwmon_device_register_with_info(priv->dev, priv->name, priv, > + &peci_dimmtemp_chip_info, NULL); > + if (IS_ERR(dev)) { > + dev_err(priv->dev, "Failed to register hwmon device\n"); > + return PTR_ERR(dev); > + } > + > + dev_dbg(priv->dev, "%s: sensor '%s'\n", dev_name(dev), priv->name); > + > + return 0; > +} > + > +static void create_dimm_temp_info_delayed(struct work_struct *work) > +{ > + struct peci_dimmtemp *priv = container_of(to_delayed_work(work), > + struct peci_dimmtemp, > + detect_work); > + int ret; > + > + ret = create_dimm_temp_info(priv); > + if (ret && ret != -EAGAIN) > + dev_err(priv->dev, "Failed to populate DIMM temp info\n"); > +} > + > +static void remove_delayed_work(void *_priv) > +{ > + struct peci_dimmtemp *priv = _priv; > + > + cancel_delayed_work_sync(&priv->detect_work); > +} > + > +static int peci_dimmtemp_probe(struct auxiliary_device *adev, const struct auxiliary_device_id *id) > +{ > + struct device *dev = &adev->dev; > + struct peci_device *peci_dev = to_peci_device(dev->parent); > + struct peci_dimmtemp *priv; > + int ret; > + > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + priv->name = devm_kasprintf(dev, GFP_KERNEL, "peci_dimmtemp.cpu%d", > + peci_dev->info.socket_id); > + if (!priv->name) > + return -ENOMEM; > + > + priv->dev = dev; > + priv->peci_dev = peci_dev; > + priv->gen_info = (const struct dimm_info *)id->driver_data; > + > + /* > + * This is just a sanity check. Since we're using commands that are > + * guaranteed to be supported on a given platform, we should never see > + * revision lower than expected. > + */ > + if (peci_dev->info.peci_revision < priv->gen_info->min_peci_revision) > + dev_warn(priv->dev, > + "Unexpected PECI revision %#x, some features may be unavailable\n", > + peci_dev->info.peci_revision); > + > + INIT_DELAYED_WORK(&priv->detect_work, create_dimm_temp_info_delayed); > + > + ret = devm_add_action_or_reset(priv->dev, remove_delayed_work, priv); > + if (ret) > + return ret; > + > + ret = create_dimm_temp_info(priv); > + if (ret && ret != -EAGAIN) { > + dev_err(dev, "Failed to populate DIMM temp info\n"); > + return ret; > + } > + > + return 0; > +} > + > +static int > +read_thresholds_hsx(struct peci_dimmtemp *priv, int dimm_order, int chan_rank, u32 *data) > +{ > + u8 dev, func; > + u16 reg; > + int ret; > + > + /* > + * Device 20, Function 0: IMC 0 channel 0 -> rank 0 > + * Device 20, Function 1: IMC 0 channel 1 -> rank 1 > + * Device 21, Function 0: IMC 0 channel 2 -> rank 2 > + * Device 21, Function 1: IMC 0 channel 3 -> rank 3 > + * Device 23, Function 0: IMC 1 channel 0 -> rank 4 > + * Device 23, Function 1: IMC 1 channel 1 -> rank 5 > + * Device 24, Function 0: IMC 1 channel 2 -> rank 6 > + * Device 24, Function 1: IMC 1 channel 3 -> rank 7 > + */ > + dev = 20 + chan_rank / 2 + chan_rank / 4; > + func = chan_rank % 2; > + reg = 0x120 + dimm_order * 4; > + > + ret = peci_pci_local_read(priv->peci_dev, 1, dev, func, reg, data); > + if (ret) > + return ret; > + > + return 0; > +} > + > +static int > +read_thresholds_bdxd(struct peci_dimmtemp *priv, int dimm_order, int chan_rank, u32 *data) > +{ > + u8 dev, func; > + u16 reg; > + int ret; > + > + /* > + * Device 10, Function 2: IMC 0 channel 0 -> rank 0 > + * Device 10, Function 6: IMC 0 channel 1 -> rank 1 > + * Device 12, Function 2: IMC 1 channel 0 -> rank 2 > + * Device 12, Function 6: IMC 1 channel 1 -> rank 3 > + */ > + dev = 10 + chan_rank / 2 * 2; > + func = (chan_rank % 2) ? 6 : 2; > + reg = 0x120 + dimm_order * 4; > + > + ret = peci_pci_local_read(priv->peci_dev, 2, dev, func, reg, data); > + if (ret) > + return ret; > + > + return 0; > +} > + > +static int > +read_thresholds_skx(struct peci_dimmtemp *priv, int dimm_order, int chan_rank, u32 *data) > +{ > + u8 dev, func; > + u16 reg; > + int ret; > + > + /* > + * Device 10, Function 2: IMC 0 channel 0 -> rank 0 > + * Device 10, Function 6: IMC 0 channel 1 -> rank 1 > + * Device 11, Function 2: IMC 0 channel 2 -> rank 2 > + * Device 12, Function 2: IMC 1 channel 0 -> rank 3 > + * Device 12, Function 6: IMC 1 channel 1 -> rank 4 > + * Device 13, Function 2: IMC 1 channel 2 -> rank 5 > + */ > + dev = 10 + chan_rank / 3 * 2 + (chan_rank % 3 == 2 ? 1 : 0); > + func = chan_rank % 3 == 1 ? 6 : 2; > + reg = 0x120 + dimm_order * 4; > + > + ret = peci_pci_local_read(priv->peci_dev, 2, dev, func, reg, data); > + if (ret) > + return ret; > + > + return 0; > +} > + > +static int > +read_thresholds_icx(struct peci_dimmtemp *priv, int dimm_order, int chan_rank, u32 *data) > +{ > + u32 reg_val; > + u64 offset; > + int ret; > + u8 dev; > + > + ret = peci_ep_pci_local_read(priv->peci_dev, 0, 13, 0, 2, 0xd4, ®_val); > + if (ret || !(reg_val & BIT(31))) > + return -ENODATA; /* Use default or previous value */ > + > + ret = peci_ep_pci_local_read(priv->peci_dev, 0, 13, 0, 2, 0xd0, ®_val); > + if (ret) > + return -ENODATA; /* Use default or previous value */ > + > + /* > + * Device 26, Offset 224e0: IMC 0 channel 0 -> rank 0 > + * Device 26, Offset 264e0: IMC 0 channel 1 -> rank 1 > + * Device 27, Offset 224e0: IMC 1 channel 0 -> rank 2 > + * Device 27, Offset 264e0: IMC 1 channel 1 -> rank 3 > + * Device 28, Offset 224e0: IMC 2 channel 0 -> rank 4 > + * Device 28, Offset 264e0: IMC 2 channel 1 -> rank 5 > + * Device 29, Offset 224e0: IMC 3 channel 0 -> rank 6 > + * Device 29, Offset 264e0: IMC 3 channel 1 -> rank 7 > + */ > + dev = 26 + chan_rank / 2; > + offset = 0x224e0 + dimm_order * 4 + (chan_rank % 2) * 0x4000; > + > + ret = peci_mmio_read(priv->peci_dev, 0, GET_CPU_SEG(reg_val), GET_CPU_BUS(reg_val), > + dev, 0, offset, data); > + if (ret) > + return ret; > + > + return 0; > +} > + > +static const struct dimm_info dimm_hsx = { > + .chan_rank_max = CHAN_RANK_MAX_ON_HSX, > + .dimm_idx_max = DIMM_IDX_MAX_ON_HSX, > + .min_peci_revision = 0x33, > + .read_thresholds = &read_thresholds_hsx, > +}; > + > +static const struct dimm_info dimm_bdx = { > + .chan_rank_max = CHAN_RANK_MAX_ON_BDX, > + .dimm_idx_max = DIMM_IDX_MAX_ON_BDX, > + .min_peci_revision = 0x33, > + .read_thresholds = &read_thresholds_hsx, > +}; > + > +static const struct dimm_info dimm_bdxd = { > + .chan_rank_max = CHAN_RANK_MAX_ON_BDXD, > + .dimm_idx_max = DIMM_IDX_MAX_ON_BDXD, > + .min_peci_revision = 0x33, > + .read_thresholds = &read_thresholds_bdxd, > +}; > + > +static const struct dimm_info dimm_skx = { > + .chan_rank_max = CHAN_RANK_MAX_ON_SKX, > + .dimm_idx_max = DIMM_IDX_MAX_ON_SKX, > + .min_peci_revision = 0x33, > + .read_thresholds = &read_thresholds_skx, > +}; > + > +static const struct dimm_info dimm_icx = { > + .chan_rank_max = CHAN_RANK_MAX_ON_ICX, > + .dimm_idx_max = DIMM_IDX_MAX_ON_ICX, > + .min_peci_revision = 0x40, > + .read_thresholds = &read_thresholds_icx, > +}; > + > +static const struct dimm_info dimm_icxd = { > + .chan_rank_max = CHAN_RANK_MAX_ON_ICXD, > + .dimm_idx_max = DIMM_IDX_MAX_ON_ICXD, > + .min_peci_revision = 0x40, > + .read_thresholds = &read_thresholds_icx, > +}; > + > +static const struct auxiliary_device_id peci_dimmtemp_ids[] = { > + { > + .name = "peci_cpu.dimmtemp.hsx", > + .driver_data = (kernel_ulong_t)&dimm_hsx, > + }, > + { > + .name = "peci_cpu.dimmtemp.bdx", > + .driver_data = (kernel_ulong_t)&dimm_bdx, > + }, > + { > + .name = "peci_cpu.dimmtemp.bdxd", > + .driver_data = (kernel_ulong_t)&dimm_bdxd, > + }, > + { > + .name = "peci_cpu.dimmtemp.skx", > + .driver_data = (kernel_ulong_t)&dimm_skx, > + }, > + { > + .name = "peci_cpu.dimmtemp.icx", > + .driver_data = (kernel_ulong_t)&dimm_icx, > + }, > + { > + .name = "peci_cpu.dimmtemp.icxd", > + .driver_data = (kernel_ulong_t)&dimm_icxd, > + }, > + { } > +}; > +MODULE_DEVICE_TABLE(auxiliary, peci_dimmtemp_ids); > + > +static struct auxiliary_driver peci_dimmtemp_driver = { > + .probe = peci_dimmtemp_probe, > + .id_table = peci_dimmtemp_ids, > +}; > + > +module_auxiliary_driver(peci_dimmtemp_driver); > + > +MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>"); > +MODULE_AUTHOR("Iwona Winiarska <iwona.winiarska@intel.com>"); > +MODULE_DESCRIPTION("PECI dimmtemp driver"); > +MODULE_LICENSE("GPL"); > +MODULE_IMPORT_NS(PECI_CPU);
On Tue, 2021-08-03 at 08:39 -0700, Guenter Roeck wrote: > On Tue, Aug 03, 2021 at 01:31:32PM +0200, Iwona Winiarska wrote: > > Add peci-dimmtemp driver for Temperature Sensor on DIMM readings that > > are accessible via the processor PECI interface. > > > > The main use case for the driver (and PECI interface) is out-of-band > > management, where we're able to obtain thermal readings from an external > > entity connected with PECI, e.g. BMC on server platforms. > > > > Co-developed-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com> > > Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com> > > Signed-off-by: Iwona Winiarska <iwona.winiarska@intel.com> > > Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> > > --- > > Note that the timeout was completely removed - we're going to probe > > for detected DIMMs every 5 seconds until we reach "stable" state of > > either getting correct DIMM data or getting all -EINVAL (which > > suggest that the CPU doesn't have any DIMMs). > > > > drivers/hwmon/peci/Kconfig | 13 + > > drivers/hwmon/peci/Makefile | 2 + > > drivers/hwmon/peci/dimmtemp.c | 614 ++++++++++++++++++++++++++++++++++ > > 3 files changed, 629 insertions(+) > > create mode 100644 drivers/hwmon/peci/dimmtemp.c > > > > diff --git a/drivers/hwmon/peci/Kconfig b/drivers/hwmon/peci/Kconfig > > index e10eed68d70a..9d32a57badfe 100644 > > --- a/drivers/hwmon/peci/Kconfig > > +++ b/drivers/hwmon/peci/Kconfig > > @@ -14,5 +14,18 @@ config SENSORS_PECI_CPUTEMP > > This driver can also be built as a module. If so, the module > > will be called peci-cputemp. > > > > +config SENSORS_PECI_DIMMTEMP > > + tristate "PECI DIMM temperature monitoring client" > > + depends on PECI > > + select SENSORS_PECI > > + select PECI_CPU > > + help > > + If you say yes here you get support for the generic Intel PECI > > hwmon > > + driver which provides Temperature Sensor on DIMM readings that are > > + accessible via the processor PECI interface. > > + > > + This driver can also be built as a module. If so, the module > > + will be called peci-dimmtemp. > > + > > config SENSORS_PECI > > tristate > > diff --git a/drivers/hwmon/peci/Makefile b/drivers/hwmon/peci/Makefile > > index e8a0ada5ab1f..191cfa0227f3 100644 > > --- a/drivers/hwmon/peci/Makefile > > +++ b/drivers/hwmon/peci/Makefile > > @@ -1,5 +1,7 @@ > > # SPDX-License-Identifier: GPL-2.0-only > > > > peci-cputemp-y := cputemp.o > > +peci-dimmtemp-y := dimmtemp.o > > > > obj-$(CONFIG_SENSORS_PECI_CPUTEMP) += peci-cputemp.o > > +obj-$(CONFIG_SENSORS_PECI_DIMMTEMP) += peci-dimmtemp.o > > diff --git a/drivers/hwmon/peci/dimmtemp.c b/drivers/hwmon/peci/dimmtemp.c > > new file mode 100644 > > index 000000000000..6264c29bb6c0 > > --- /dev/null > > +++ b/drivers/hwmon/peci/dimmtemp.c > > @@ -0,0 +1,614 @@ > > +// SPDX-License-Identifier: GPL-2.0-only > > +// Copyright (c) 2018-2021 Intel Corporation > > + > > +#include <linux/auxiliary_bus.h> > > +#include <linux/bitfield.h> > > +#include <linux/bitops.h> > > +#include <linux/hwmon.h> > > +#include <linux/jiffies.h> > > +#include <linux/module.h> > > +#include <linux/peci.h> > > +#include <linux/peci-cpu.h> > > +#include <linux/units.h> > > +#include <linux/workqueue.h> > > +#include <linux/x86/intel-family.h> > > + > > +#include "common.h" > > + > > +#define DIMM_MASK_CHECK_DELAY_JIFFIES msecs_to_jiffies(5000) > > + > > +/* Max number of channel ranks and DIMM index per channel */ > > +#define CHAN_RANK_MAX_ON_HSX 8 > > +#define DIMM_IDX_MAX_ON_HSX 3 > > +#define CHAN_RANK_MAX_ON_BDX 4 > > +#define DIMM_IDX_MAX_ON_BDX 3 > > +#define CHAN_RANK_MAX_ON_BDXD 2 > > +#define DIMM_IDX_MAX_ON_BDXD 2 > > +#define CHAN_RANK_MAX_ON_SKX 6 > > +#define DIMM_IDX_MAX_ON_SKX 2 > > +#define CHAN_RANK_MAX_ON_ICX 8 > > +#define DIMM_IDX_MAX_ON_ICX 2 > > +#define CHAN_RANK_MAX_ON_ICXD 4 > > +#define DIMM_IDX_MAX_ON_ICXD 2 > > + > > +#define CHAN_RANK_MAX CHAN_RANK_MAX_ON_HSX > > +#define DIMM_IDX_MAX DIMM_IDX_MAX_ON_HSX > > +#define DIMM_NUMS_MAX (CHAN_RANK_MAX * DIMM_IDX_MAX) > > + > > +#define CPU_SEG_MASK GENMASK(23, 16) > > +#define GET_CPU_SEG(x) (((x) & CPU_SEG_MASK) >> 16) > > +#define CPU_BUS_MASK GENMASK(7, 0) > > +#define GET_CPU_BUS(x) ((x) & CPU_BUS_MASK) > > + > > +#define DIMM_TEMP_MAX GENMASK(15, 8) > > +#define DIMM_TEMP_CRIT GENMASK(23, 16) > > +#define GET_TEMP_MAX(x) (((x) & DIMM_TEMP_MAX) >> 8) > > +#define GET_TEMP_CRIT(x) (((x) & DIMM_TEMP_CRIT) >> 16) > > + > > +struct peci_dimmtemp; > > + > > +struct dimm_info { > > + int chan_rank_max; > > + int dimm_idx_max; > > + u8 min_peci_revision; > > + int (*read_thresholds)(struct peci_dimmtemp *priv, int dimm_order, > > + int chan_rank, u32 *data); > > +}; > > + > > +struct peci_dimm_thresholds { > > + long temp_max; > > + long temp_crit; > > + struct peci_sensor_state state; > > +}; > > + > > +enum peci_dimm_threshold_type { > > + temp_max_type, > > + temp_crit_type, > > +}; > > + > > +struct peci_dimmtemp { > > + struct peci_device *peci_dev; > > + struct device *dev; > > + const char *name; > > + const struct dimm_info *gen_info; > > + struct delayed_work detect_work; > > + struct { > > + struct peci_sensor_data temp; > > + struct peci_dimm_thresholds thresholds; > > + } dimm[DIMM_NUMS_MAX]; > > + char **dimmtemp_label; > > + DECLARE_BITMAP(dimm_mask, DIMM_NUMS_MAX); > > +}; > > + > > +static u8 __dimm_temp(u32 reg, int dimm_order) > > +{ > > + return (reg >> (dimm_order * 8)) & 0xff; > > +} > > + > > +static int get_dimm_temp(struct peci_dimmtemp *priv, int dimm_no, long > > *val) > > +{ > > + int dimm_order = dimm_no % priv->gen_info->dimm_idx_max; > > + int chan_rank = dimm_no / priv->gen_info->dimm_idx_max; > > + u32 data; > > + int ret; > > int ret = 0; > > > + > > + mutex_lock(&priv->dimm[dimm_no].temp.state.lock); > > + if (!peci_sensor_need_update(&priv->dimm[dimm_no].temp.state)) > > + goto skip_update; > > + > > + ret = peci_pcs_read(priv->peci_dev, PECI_PCS_DDR_DIMM_TEMP, > > chan_rank, &data); > > + if (ret) { > > + mutex_unlock(&priv->dimm[dimm_no].temp.state.lock); > > + return ret; > > + } > > if (ret) > goto unlock; > > > + > > + priv->dimm[dimm_no].temp.value = __dimm_temp(data, dimm_order) * > > MILLIDEGREE_PER_DEGREE; > > + > > + peci_sensor_mark_updated(&priv->dimm[dimm_no].temp.state); > > + > > +skip_update: > > + *val = priv->dimm[dimm_no].temp.value; > > unlock: > > + mutex_unlock(&priv->dimm[dimm_no].temp.state.lock); > > + return 0; > > return ret; Ack. > > > +} > > + > > +static int update_thresholds(struct peci_dimmtemp *priv, int dimm_no) > > +{ > > + int dimm_order = dimm_no % priv->gen_info->dimm_idx_max; > > + int chan_rank = dimm_no / priv->gen_info->dimm_idx_max; > > + u32 data; > > + int ret; > > + > > + if (!peci_sensor_need_update(&priv->dimm[dimm_no].thresholds.state)) > > + return 0; > > + > > + ret = priv->gen_info->read_thresholds(priv, dimm_order, chan_rank, > > &data); > > + if (ret == -ENODATA) /* Use default or previous value */ > > + return 0; > > + if (ret) > > + return ret; > > + > > + priv->dimm[dimm_no].thresholds.temp_max = GET_TEMP_MAX(data) * > > MILLIDEGREE_PER_DEGREE; > > + priv->dimm[dimm_no].thresholds.temp_crit = GET_TEMP_CRIT(data) * > > MILLIDEGREE_PER_DEGREE; > > + > > + peci_sensor_mark_updated(&priv->dimm[dimm_no].thresholds.state); > > + > > + return 0; > > +} > > + > > +static int get_dimm_thresholds(struct peci_dimmtemp *priv, enum > > peci_dimm_threshold_type type, > > + int dimm_no, long *val) > > +{ > > + int ret; > > + > > + mutex_lock(&priv->dimm[dimm_no].thresholds.state.lock); > > + ret = update_thresholds(priv, dimm_no); > > + if (ret) > > + goto unlock; > > + > > + switch (type) { > > + case temp_max_type: > > + *val = priv->dimm[dimm_no].thresholds.temp_max; > > + break; > > + case temp_crit_type: > > + *val = priv->dimm[dimm_no].thresholds.temp_crit; > > + break; > > + default: > > + ret = -EOPNOTSUPP; > > + break; > > + } > > +unlock: > > + mutex_unlock(&priv->dimm[dimm_no].thresholds.state.lock); > > + > > + return ret; > > +} > > + > > +static int dimmtemp_read_string(struct device *dev, > > + enum hwmon_sensor_types type, > > + u32 attr, int channel, const char **str) > > +{ > > + struct peci_dimmtemp *priv = dev_get_drvdata(dev); > > + > > + if (attr != hwmon_temp_label) > > + return -EOPNOTSUPP; > > + > > + *str = (const char *)priv->dimmtemp_label[channel]; > > + > > + return 0; > > +} > > + > > +static int dimmtemp_read(struct device *dev, enum hwmon_sensor_types type, > > + u32 attr, int channel, long *val) > > +{ > > + struct peci_dimmtemp *priv = dev_get_drvdata(dev); > > + > > + switch (attr) { > > + case hwmon_temp_input: > > + return get_dimm_temp(priv, channel, val); > > + case hwmon_temp_max: > > + return get_dimm_thresholds(priv, temp_max_type, channel, > > val); > > + case hwmon_temp_crit: > > + return get_dimm_thresholds(priv, temp_crit_type, channel, > > val); > > + default: > > + break; > > + } > > + > > + return -EOPNOTSUPP; > > +} > > + > > +static umode_t dimmtemp_is_visible(const void *data, enum > > hwmon_sensor_types type, > > + u32 attr, int channel) > > +{ > > + const struct peci_dimmtemp *priv = data; > > + > > + if (test_bit(channel, priv->dimm_mask)) > > + return 0444; > > + > > + return 0; > > +} > > + > > +static const struct hwmon_ops peci_dimmtemp_ops = { > > + .is_visible = dimmtemp_is_visible, > > + .read_string = dimmtemp_read_string, > > + .read = dimmtemp_read, > > +}; > > + > > +static int check_populated_dimms(struct peci_dimmtemp *priv) > > +{ > > + int chan_rank_max = priv->gen_info->chan_rank_max; > > + int dimm_idx_max = priv->gen_info->dimm_idx_max; > > + u32 chan_rank_empty = 0; > > + u64 dimm_mask = 0; > > + int chan_rank, dimm_idx, ret; > > + u32 pcs; > > + > > + BUILD_BUG_ON(CHAN_RANK_MAX > 32); > > + BUILD_BUG_ON(DIMM_NUMS_MAX > 64); > > I don't immediately see the value of those build bugs. What happens if > CHAN_RANK_MAX > 32 or DIMM_NUMS_MAX > 64 ? Where do those limits come > from ? Supported HW doesn't come near the limit for now - it's just an "artificial" limit imposed by variables we're using (u64 for dimm_mask and u32 for chan_rank_empty). > > > + if (chan_rank_max * dimm_idx_max > DIMM_NUMS_MAX) { > > + WARN_ONCE(1, "Unsupported number of DIMMs"); > > Maybe display the values (chan_rank_max and dimm_idx_max). Ok. > > > + return -EINVAL; > > + } > > + > > + for (chan_rank = 0; chan_rank < chan_rank_max; chan_rank++) { > > + ret = peci_pcs_read(priv->peci_dev, PECI_PCS_DDR_DIMM_TEMP, > > chan_rank, &pcs); > > + if (ret) { > > + /* > > + * Overall, we expect either success or -EINVAL in > > + * order to determine whether DIMM is populated or > > not. > > + * For anything else - we fall back to defering the > > Why " - " ? Hum... No idea after reading it now. I'll drop it. Thank you -Iwona > > > + * detection to be performed at a later point in > > time. > > + */ > > + if (ret == -EINVAL) { > > + chan_rank_empty |= BIT(chan_rank); > > + continue; > > + } > > + > > + return -EAGAIN; > > + } > > + > > + for (dimm_idx = 0; dimm_idx < dimm_idx_max; dimm_idx++) > > + if (__dimm_temp(pcs, dimm_idx)) > > + dimm_mask |= BIT(chan_rank * dimm_idx_max + > > dimm_idx); > > + } > > + > > + /* If we got all -EINVALs, it means that the CPU doesn't have any > > DIMMs. */ > > + if (chan_rank_empty == GENMASK(chan_rank_max - 1, 0)) > > + return -ENODEV; > > + > > + /* > > + * It's possible that memory training is not done yet. In this case > > we > > + * defer the detection to be performed at a later point in time. > > + */ > > + if (!dimm_mask) > > + return -EAGAIN; > > + > > + dev_dbg(priv->dev, "Scanned populated DIMMs: %#llx\n", dimm_mask); > > + > > + bitmap_from_u64(priv->dimm_mask, dimm_mask); > > + > > + return 0; > > +} > > + > > +static int create_dimm_temp_label(struct peci_dimmtemp *priv, int chan) > > +{ > > + int rank = chan / priv->gen_info->dimm_idx_max; > > + int idx = chan % priv->gen_info->dimm_idx_max; > > + > > + priv->dimmtemp_label[chan] = devm_kasprintf(priv->dev, GFP_KERNEL, > > + "DIMM %c%d", 'A' + rank, > > + idx + 1); > > + if (!priv->dimmtemp_label[chan]) > > + return -ENOMEM; > > + > > + return 0; > > +} > > + > > +static const u32 peci_dimmtemp_temp_channel_config[] = { > > + [0 ... DIMM_NUMS_MAX - 1] = HWMON_T_LABEL | HWMON_T_INPUT | > > HWMON_T_MAX | HWMON_T_CRIT, > > + 0 > > +}; > > + > > +static const struct hwmon_channel_info peci_dimmtemp_temp_channel = { > > + .type = hwmon_temp, > > + .config = peci_dimmtemp_temp_channel_config, > > +}; > > + > > +static const struct hwmon_channel_info *peci_dimmtemp_temp_info[] = { > > + &peci_dimmtemp_temp_channel, > > + NULL > > +}; > > + > > +static const struct hwmon_chip_info peci_dimmtemp_chip_info = { > > + .ops = &peci_dimmtemp_ops, > > + .info = peci_dimmtemp_temp_info, > > +}; > > + > > +static int create_dimm_temp_info(struct peci_dimmtemp *priv) > > +{ > > + int ret, i, channels; > > + struct device *dev; > > + > > + /* > > + * We expect to either find populated DIMMs and carry on with > > creating > > + * sensors, or find out that there are no DIMMs populated. > > + * All other states mean that the platform never reached the state > > that > > + * allows to check DIMM state - causing us to retry later on. > > + */ > > + ret = check_populated_dimms(priv); > > + if (ret == -ENODEV) { > > + dev_dbg(priv->dev, "No DIMMs found\n"); > > + return 0; > > + } else if (ret) { > > + schedule_delayed_work(&priv->detect_work, > > DIMM_MASK_CHECK_DELAY_JIFFIES); > > + dev_dbg(priv->dev, "Deferred populating DIMM temp info\n"); > > + return ret; > > + } > > + > > + channels = priv->gen_info->chan_rank_max * priv->gen_info- > > >dimm_idx_max; > > + > > + priv->dimmtemp_label = devm_kzalloc(priv->dev, channels * > > sizeof(char *), GFP_KERNEL); > > + if (!priv->dimmtemp_label) > > + return -ENOMEM; > > + > > + for_each_set_bit(i, priv->dimm_mask, DIMM_NUMS_MAX) { > > + ret = create_dimm_temp_label(priv, i); > > + if (ret) > > + return ret; > > + mutex_init(&priv->dimm[i].thresholds.state.lock); > > + mutex_init(&priv->dimm[i].temp.state.lock); > > + } > > + > > + dev = devm_hwmon_device_register_with_info(priv->dev, priv->name, > > priv, > > + &peci_dimmtemp_chip_info, > > NULL); > > + if (IS_ERR(dev)) { > > + dev_err(priv->dev, "Failed to register hwmon device\n"); > > + return PTR_ERR(dev); > > + } > > + > > + dev_dbg(priv->dev, "%s: sensor '%s'\n", dev_name(dev), priv->name); > > + > > + return 0; > > +} > > + > > +static void create_dimm_temp_info_delayed(struct work_struct *work) > > +{ > > + struct peci_dimmtemp *priv = container_of(to_delayed_work(work), > > + struct peci_dimmtemp, > > + detect_work); > > + int ret; > > + > > + ret = create_dimm_temp_info(priv); > > + if (ret && ret != -EAGAIN) > > + dev_err(priv->dev, "Failed to populate DIMM temp info\n"); > > +} > > + > > +static void remove_delayed_work(void *_priv) > > +{ > > + struct peci_dimmtemp *priv = _priv; > > + > > + cancel_delayed_work_sync(&priv->detect_work); > > +} > > + > > +static int peci_dimmtemp_probe(struct auxiliary_device *adev, const struct > > auxiliary_device_id *id) > > +{ > > + struct device *dev = &adev->dev; > > + struct peci_device *peci_dev = to_peci_device(dev->parent); > > + struct peci_dimmtemp *priv; > > + int ret; > > + > > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > > + if (!priv) > > + return -ENOMEM; > > + > > + priv->name = devm_kasprintf(dev, GFP_KERNEL, "peci_dimmtemp.cpu%d", > > + peci_dev->info.socket_id); > > + if (!priv->name) > > + return -ENOMEM; > > + > > + priv->dev = dev; > > + priv->peci_dev = peci_dev; > > + priv->gen_info = (const struct dimm_info *)id->driver_data; > > + > > + /* > > + * This is just a sanity check. Since we're using commands that are > > + * guaranteed to be supported on a given platform, we should never > > see > > + * revision lower than expected. > > + */ > > + if (peci_dev->info.peci_revision < priv->gen_info- > > >min_peci_revision) > > + dev_warn(priv->dev, > > + "Unexpected PECI revision %#x, some features may be > > unavailable\n", > > + peci_dev->info.peci_revision); > > + > > + INIT_DELAYED_WORK(&priv->detect_work, > > create_dimm_temp_info_delayed); > > + > > + ret = devm_add_action_or_reset(priv->dev, remove_delayed_work, > > priv); > > + if (ret) > > + return ret; > > + > > + ret = create_dimm_temp_info(priv); > > + if (ret && ret != -EAGAIN) { > > + dev_err(dev, "Failed to populate DIMM temp info\n"); > > + return ret; > > + } > > + > > + return 0; > > +} > > + > > +static int > > +read_thresholds_hsx(struct peci_dimmtemp *priv, int dimm_order, int > > chan_rank, u32 *data) > > +{ > > + u8 dev, func; > > + u16 reg; > > + int ret; > > + > > + /* > > + * Device 20, Function 0: IMC 0 channel 0 -> rank 0 > > + * Device 20, Function 1: IMC 0 channel 1 -> rank 1 > > + * Device 21, Function 0: IMC 0 channel 2 -> rank 2 > > + * Device 21, Function 1: IMC 0 channel 3 -> rank 3 > > + * Device 23, Function 0: IMC 1 channel 0 -> rank 4 > > + * Device 23, Function 1: IMC 1 channel 1 -> rank 5 > > + * Device 24, Function 0: IMC 1 channel 2 -> rank 6 > > + * Device 24, Function 1: IMC 1 channel 3 -> rank 7 > > + */ > > + dev = 20 + chan_rank / 2 + chan_rank / 4; > > + func = chan_rank % 2; > > + reg = 0x120 + dimm_order * 4; > > + > > + ret = peci_pci_local_read(priv->peci_dev, 1, dev, func, reg, data); > > + if (ret) > > + return ret; > > + > > + return 0; > > +} > > + > > +static int > > +read_thresholds_bdxd(struct peci_dimmtemp *priv, int dimm_order, int > > chan_rank, u32 *data) > > +{ > > + u8 dev, func; > > + u16 reg; > > + int ret; > > + > > + /* > > + * Device 10, Function 2: IMC 0 channel 0 -> rank 0 > > + * Device 10, Function 6: IMC 0 channel 1 -> rank 1 > > + * Device 12, Function 2: IMC 1 channel 0 -> rank 2 > > + * Device 12, Function 6: IMC 1 channel 1 -> rank 3 > > + */ > > + dev = 10 + chan_rank / 2 * 2; > > + func = (chan_rank % 2) ? 6 : 2; > > + reg = 0x120 + dimm_order * 4; > > + > > + ret = peci_pci_local_read(priv->peci_dev, 2, dev, func, reg, data); > > + if (ret) > > + return ret; > > + > > + return 0; > > +} > > + > > +static int > > +read_thresholds_skx(struct peci_dimmtemp *priv, int dimm_order, int > > chan_rank, u32 *data) > > +{ > > + u8 dev, func; > > + u16 reg; > > + int ret; > > + > > + /* > > + * Device 10, Function 2: IMC 0 channel 0 -> rank 0 > > + * Device 10, Function 6: IMC 0 channel 1 -> rank 1 > > + * Device 11, Function 2: IMC 0 channel 2 -> rank 2 > > + * Device 12, Function 2: IMC 1 channel 0 -> rank 3 > > + * Device 12, Function 6: IMC 1 channel 1 -> rank 4 > > + * Device 13, Function 2: IMC 1 channel 2 -> rank 5 > > + */ > > + dev = 10 + chan_rank / 3 * 2 + (chan_rank % 3 == 2 ? 1 : 0); > > + func = chan_rank % 3 == 1 ? 6 : 2; > > + reg = 0x120 + dimm_order * 4; > > + > > + ret = peci_pci_local_read(priv->peci_dev, 2, dev, func, reg, data); > > + if (ret) > > + return ret; > > + > > + return 0; > > +} > > + > > +static int > > +read_thresholds_icx(struct peci_dimmtemp *priv, int dimm_order, int > > chan_rank, u32 *data) > > +{ > > + u32 reg_val; > > + u64 offset; > > + int ret; > > + u8 dev; > > + > > + ret = peci_ep_pci_local_read(priv->peci_dev, 0, 13, 0, 2, 0xd4, > > ®_val); > > + if (ret || !(reg_val & BIT(31))) > > + return -ENODATA; /* Use default or previous value */ > > + > > + ret = peci_ep_pci_local_read(priv->peci_dev, 0, 13, 0, 2, 0xd0, > > ®_val); > > + if (ret) > > + return -ENODATA; /* Use default or previous value */ > > + > > + /* > > + * Device 26, Offset 224e0: IMC 0 channel 0 -> rank 0 > > + * Device 26, Offset 264e0: IMC 0 channel 1 -> rank 1 > > + * Device 27, Offset 224e0: IMC 1 channel 0 -> rank 2 > > + * Device 27, Offset 264e0: IMC 1 channel 1 -> rank 3 > > + * Device 28, Offset 224e0: IMC 2 channel 0 -> rank 4 > > + * Device 28, Offset 264e0: IMC 2 channel 1 -> rank 5 > > + * Device 29, Offset 224e0: IMC 3 channel 0 -> rank 6 > > + * Device 29, Offset 264e0: IMC 3 channel 1 -> rank 7 > > + */ > > + dev = 26 + chan_rank / 2; > > + offset = 0x224e0 + dimm_order * 4 + (chan_rank % 2) * 0x4000; > > + > > + ret = peci_mmio_read(priv->peci_dev, 0, GET_CPU_SEG(reg_val), > > GET_CPU_BUS(reg_val), > > + dev, 0, offset, data); > > + if (ret) > > + return ret; > > + > > + return 0; > > +} > > + > > +static const struct dimm_info dimm_hsx = { > > + .chan_rank_max = CHAN_RANK_MAX_ON_HSX, > > + .dimm_idx_max = DIMM_IDX_MAX_ON_HSX, > > + .min_peci_revision = 0x33, > > + .read_thresholds = &read_thresholds_hsx, > > +}; > > + > > +static const struct dimm_info dimm_bdx = { > > + .chan_rank_max = CHAN_RANK_MAX_ON_BDX, > > + .dimm_idx_max = DIMM_IDX_MAX_ON_BDX, > > + .min_peci_revision = 0x33, > > + .read_thresholds = &read_thresholds_hsx, > > +}; > > + > > +static const struct dimm_info dimm_bdxd = { > > + .chan_rank_max = CHAN_RANK_MAX_ON_BDXD, > > + .dimm_idx_max = DIMM_IDX_MAX_ON_BDXD, > > + .min_peci_revision = 0x33, > > + .read_thresholds = &read_thresholds_bdxd, > > +}; > > + > > +static const struct dimm_info dimm_skx = { > > + .chan_rank_max = CHAN_RANK_MAX_ON_SKX, > > + .dimm_idx_max = DIMM_IDX_MAX_ON_SKX, > > + .min_peci_revision = 0x33, > > + .read_thresholds = &read_thresholds_skx, > > +}; > > + > > +static const struct dimm_info dimm_icx = { > > + .chan_rank_max = CHAN_RANK_MAX_ON_ICX, > > + .dimm_idx_max = DIMM_IDX_MAX_ON_ICX, > > + .min_peci_revision = 0x40, > > + .read_thresholds = &read_thresholds_icx, > > +}; > > + > > +static const struct dimm_info dimm_icxd = { > > + .chan_rank_max = CHAN_RANK_MAX_ON_ICXD, > > + .dimm_idx_max = DIMM_IDX_MAX_ON_ICXD, > > + .min_peci_revision = 0x40, > > + .read_thresholds = &read_thresholds_icx, > > +}; > > + > > +static const struct auxiliary_device_id peci_dimmtemp_ids[] = { > > + { > > + .name = "peci_cpu.dimmtemp.hsx", > > + .driver_data = (kernel_ulong_t)&dimm_hsx, > > + }, > > + { > > + .name = "peci_cpu.dimmtemp.bdx", > > + .driver_data = (kernel_ulong_t)&dimm_bdx, > > + }, > > + { > > + .name = "peci_cpu.dimmtemp.bdxd", > > + .driver_data = (kernel_ulong_t)&dimm_bdxd, > > + }, > > + { > > + .name = "peci_cpu.dimmtemp.skx", > > + .driver_data = (kernel_ulong_t)&dimm_skx, > > + }, > > + { > > + .name = "peci_cpu.dimmtemp.icx", > > + .driver_data = (kernel_ulong_t)&dimm_icx, > > + }, > > + { > > + .name = "peci_cpu.dimmtemp.icxd", > > + .driver_data = (kernel_ulong_t)&dimm_icxd, > > + }, > > + { } > > +}; > > +MODULE_DEVICE_TABLE(auxiliary, peci_dimmtemp_ids); > > + > > +static struct auxiliary_driver peci_dimmtemp_driver = { > > + .probe = peci_dimmtemp_probe, > > + .id_table = peci_dimmtemp_ids, > > +}; > > + > > +module_auxiliary_driver(peci_dimmtemp_driver); > > + > > +MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>"); > > +MODULE_AUTHOR("Iwona Winiarska <iwona.winiarska@intel.com>"); > > +MODULE_DESCRIPTION("PECI dimmtemp driver"); > > +MODULE_LICENSE("GPL"); > > +MODULE_IMPORT_NS(PECI_CPU);
On 8/4/21 3:46 AM, Winiarska, Iwona wrote: > On Tue, 2021-08-03 at 08:39 -0700, Guenter Roeck wrote: >> On Tue, Aug 03, 2021 at 01:31:32PM +0200, Iwona Winiarska wrote: >>> Add peci-dimmtemp driver for Temperature Sensor on DIMM readings that >>> are accessible via the processor PECI interface. >>> >>> The main use case for the driver (and PECI interface) is out-of-band >>> management, where we're able to obtain thermal readings from an external >>> entity connected with PECI, e.g. BMC on server platforms. >>> >>> Co-developed-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com> >>> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com> >>> Signed-off-by: Iwona Winiarska <iwona.winiarska@intel.com> >>> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> >>> --- >>> Note that the timeout was completely removed - we're going to probe >>> for detected DIMMs every 5 seconds until we reach "stable" state of >>> either getting correct DIMM data or getting all -EINVAL (which >>> suggest that the CPU doesn't have any DIMMs). >>> >>> drivers/hwmon/peci/Kconfig | 13 + >>> drivers/hwmon/peci/Makefile | 2 + >>> drivers/hwmon/peci/dimmtemp.c | 614 ++++++++++++++++++++++++++++++++++ >>> 3 files changed, 629 insertions(+) >>> create mode 100644 drivers/hwmon/peci/dimmtemp.c >>> >>> diff --git a/drivers/hwmon/peci/Kconfig b/drivers/hwmon/peci/Kconfig >>> index e10eed68d70a..9d32a57badfe 100644 >>> --- a/drivers/hwmon/peci/Kconfig >>> +++ b/drivers/hwmon/peci/Kconfig >>> @@ -14,5 +14,18 @@ config SENSORS_PECI_CPUTEMP >>> This driver can also be built as a module. If so, the module >>> will be called peci-cputemp. >>> >>> +config SENSORS_PECI_DIMMTEMP >>> + tristate "PECI DIMM temperature monitoring client" >>> + depends on PECI >>> + select SENSORS_PECI >>> + select PECI_CPU >>> + help >>> + If you say yes here you get support for the generic Intel PECI >>> hwmon >>> + driver which provides Temperature Sensor on DIMM readings that are >>> + accessible via the processor PECI interface. >>> + >>> + This driver can also be built as a module. If so, the module >>> + will be called peci-dimmtemp. >>> + >>> config SENSORS_PECI >>> tristate >>> diff --git a/drivers/hwmon/peci/Makefile b/drivers/hwmon/peci/Makefile >>> index e8a0ada5ab1f..191cfa0227f3 100644 >>> --- a/drivers/hwmon/peci/Makefile >>> +++ b/drivers/hwmon/peci/Makefile >>> @@ -1,5 +1,7 @@ >>> # SPDX-License-Identifier: GPL-2.0-only >>> >>> peci-cputemp-y := cputemp.o >>> +peci-dimmtemp-y := dimmtemp.o >>> >>> obj-$(CONFIG_SENSORS_PECI_CPUTEMP) += peci-cputemp.o >>> +obj-$(CONFIG_SENSORS_PECI_DIMMTEMP) += peci-dimmtemp.o >>> diff --git a/drivers/hwmon/peci/dimmtemp.c b/drivers/hwmon/peci/dimmtemp.c >>> new file mode 100644 >>> index 000000000000..6264c29bb6c0 >>> --- /dev/null >>> +++ b/drivers/hwmon/peci/dimmtemp.c >>> @@ -0,0 +1,614 @@ >>> +// SPDX-License-Identifier: GPL-2.0-only >>> +// Copyright (c) 2018-2021 Intel Corporation >>> + >>> +#include <linux/auxiliary_bus.h> >>> +#include <linux/bitfield.h> >>> +#include <linux/bitops.h> >>> +#include <linux/hwmon.h> >>> +#include <linux/jiffies.h> >>> +#include <linux/module.h> >>> +#include <linux/peci.h> >>> +#include <linux/peci-cpu.h> >>> +#include <linux/units.h> >>> +#include <linux/workqueue.h> >>> +#include <linux/x86/intel-family.h> >>> + >>> +#include "common.h" >>> + >>> +#define DIMM_MASK_CHECK_DELAY_JIFFIES msecs_to_jiffies(5000) >>> + >>> +/* Max number of channel ranks and DIMM index per channel */ >>> +#define CHAN_RANK_MAX_ON_HSX 8 >>> +#define DIMM_IDX_MAX_ON_HSX 3 >>> +#define CHAN_RANK_MAX_ON_BDX 4 >>> +#define DIMM_IDX_MAX_ON_BDX 3 >>> +#define CHAN_RANK_MAX_ON_BDXD 2 >>> +#define DIMM_IDX_MAX_ON_BDXD 2 >>> +#define CHAN_RANK_MAX_ON_SKX 6 >>> +#define DIMM_IDX_MAX_ON_SKX 2 >>> +#define CHAN_RANK_MAX_ON_ICX 8 >>> +#define DIMM_IDX_MAX_ON_ICX 2 >>> +#define CHAN_RANK_MAX_ON_ICXD 4 >>> +#define DIMM_IDX_MAX_ON_ICXD 2 >>> + >>> +#define CHAN_RANK_MAX CHAN_RANK_MAX_ON_HSX >>> +#define DIMM_IDX_MAX DIMM_IDX_MAX_ON_HSX >>> +#define DIMM_NUMS_MAX (CHAN_RANK_MAX * DIMM_IDX_MAX) >>> + >>> +#define CPU_SEG_MASK GENMASK(23, 16) >>> +#define GET_CPU_SEG(x) (((x) & CPU_SEG_MASK) >> 16) >>> +#define CPU_BUS_MASK GENMASK(7, 0) >>> +#define GET_CPU_BUS(x) ((x) & CPU_BUS_MASK) >>> + >>> +#define DIMM_TEMP_MAX GENMASK(15, 8) >>> +#define DIMM_TEMP_CRIT GENMASK(23, 16) >>> +#define GET_TEMP_MAX(x) (((x) & DIMM_TEMP_MAX) >> 8) >>> +#define GET_TEMP_CRIT(x) (((x) & DIMM_TEMP_CRIT) >> 16) >>> + >>> +struct peci_dimmtemp; >>> + >>> +struct dimm_info { >>> + int chan_rank_max; >>> + int dimm_idx_max; >>> + u8 min_peci_revision; >>> + int (*read_thresholds)(struct peci_dimmtemp *priv, int dimm_order, >>> + int chan_rank, u32 *data); >>> +}; >>> + >>> +struct peci_dimm_thresholds { >>> + long temp_max; >>> + long temp_crit; >>> + struct peci_sensor_state state; >>> +}; >>> + >>> +enum peci_dimm_threshold_type { >>> + temp_max_type, >>> + temp_crit_type, >>> +}; >>> + >>> +struct peci_dimmtemp { >>> + struct peci_device *peci_dev; >>> + struct device *dev; >>> + const char *name; >>> + const struct dimm_info *gen_info; >>> + struct delayed_work detect_work; >>> + struct { >>> + struct peci_sensor_data temp; >>> + struct peci_dimm_thresholds thresholds; >>> + } dimm[DIMM_NUMS_MAX]; >>> + char **dimmtemp_label; >>> + DECLARE_BITMAP(dimm_mask, DIMM_NUMS_MAX); >>> +}; >>> + >>> +static u8 __dimm_temp(u32 reg, int dimm_order) >>> +{ >>> + return (reg >> (dimm_order * 8)) & 0xff; >>> +} >>> + >>> +static int get_dimm_temp(struct peci_dimmtemp *priv, int dimm_no, long >>> *val) >>> +{ >>> + int dimm_order = dimm_no % priv->gen_info->dimm_idx_max; >>> + int chan_rank = dimm_no / priv->gen_info->dimm_idx_max; >>> + u32 data; >>> + int ret; >> >> int ret = 0; >> >>> + >>> + mutex_lock(&priv->dimm[dimm_no].temp.state.lock); >>> + if (!peci_sensor_need_update(&priv->dimm[dimm_no].temp.state)) >>> + goto skip_update; >>> + >>> + ret = peci_pcs_read(priv->peci_dev, PECI_PCS_DDR_DIMM_TEMP, >>> chan_rank, &data); >>> + if (ret) { >>> + mutex_unlock(&priv->dimm[dimm_no].temp.state.lock); >>> + return ret; >>> + } >> >> if (ret) >> goto unlock; >> >>> + >>> + priv->dimm[dimm_no].temp.value = __dimm_temp(data, dimm_order) * >>> MILLIDEGREE_PER_DEGREE; >>> + >>> + peci_sensor_mark_updated(&priv->dimm[dimm_no].temp.state); >>> + >>> +skip_update: >>> + *val = priv->dimm[dimm_no].temp.value; >> >> unlock: >>> + mutex_unlock(&priv->dimm[dimm_no].temp.state.lock); >>> + return 0; >> >> return ret; > > Ack. > >> >>> +} >>> + >>> +static int update_thresholds(struct peci_dimmtemp *priv, int dimm_no) >>> +{ >>> + int dimm_order = dimm_no % priv->gen_info->dimm_idx_max; >>> + int chan_rank = dimm_no / priv->gen_info->dimm_idx_max; >>> + u32 data; >>> + int ret; >>> + >>> + if (!peci_sensor_need_update(&priv->dimm[dimm_no].thresholds.state)) >>> + return 0; >>> + >>> + ret = priv->gen_info->read_thresholds(priv, dimm_order, chan_rank, >>> &data); >>> + if (ret == -ENODATA) /* Use default or previous value */ >>> + return 0; >>> + if (ret) >>> + return ret; >>> + >>> + priv->dimm[dimm_no].thresholds.temp_max = GET_TEMP_MAX(data) * >>> MILLIDEGREE_PER_DEGREE; >>> + priv->dimm[dimm_no].thresholds.temp_crit = GET_TEMP_CRIT(data) * >>> MILLIDEGREE_PER_DEGREE; >>> + >>> + peci_sensor_mark_updated(&priv->dimm[dimm_no].thresholds.state); >>> + >>> + return 0; >>> +} >>> + >>> +static int get_dimm_thresholds(struct peci_dimmtemp *priv, enum >>> peci_dimm_threshold_type type, >>> + int dimm_no, long *val) >>> +{ >>> + int ret; >>> + >>> + mutex_lock(&priv->dimm[dimm_no].thresholds.state.lock); >>> + ret = update_thresholds(priv, dimm_no); >>> + if (ret) >>> + goto unlock; >>> + >>> + switch (type) { >>> + case temp_max_type: >>> + *val = priv->dimm[dimm_no].thresholds.temp_max; >>> + break; >>> + case temp_crit_type: >>> + *val = priv->dimm[dimm_no].thresholds.temp_crit; >>> + break; >>> + default: >>> + ret = -EOPNOTSUPP; >>> + break; >>> + } >>> +unlock: >>> + mutex_unlock(&priv->dimm[dimm_no].thresholds.state.lock); >>> + >>> + return ret; >>> +} >>> + >>> +static int dimmtemp_read_string(struct device *dev, >>> + enum hwmon_sensor_types type, >>> + u32 attr, int channel, const char **str) >>> +{ >>> + struct peci_dimmtemp *priv = dev_get_drvdata(dev); >>> + >>> + if (attr != hwmon_temp_label) >>> + return -EOPNOTSUPP; >>> + >>> + *str = (const char *)priv->dimmtemp_label[channel]; >>> + >>> + return 0; >>> +} >>> + >>> +static int dimmtemp_read(struct device *dev, enum hwmon_sensor_types type, >>> + u32 attr, int channel, long *val) >>> +{ >>> + struct peci_dimmtemp *priv = dev_get_drvdata(dev); >>> + >>> + switch (attr) { >>> + case hwmon_temp_input: >>> + return get_dimm_temp(priv, channel, val); >>> + case hwmon_temp_max: >>> + return get_dimm_thresholds(priv, temp_max_type, channel, >>> val); >>> + case hwmon_temp_crit: >>> + return get_dimm_thresholds(priv, temp_crit_type, channel, >>> val); >>> + default: >>> + break; >>> + } >>> + >>> + return -EOPNOTSUPP; >>> +} >>> + >>> +static umode_t dimmtemp_is_visible(const void *data, enum >>> hwmon_sensor_types type, >>> + u32 attr, int channel) >>> +{ >>> + const struct peci_dimmtemp *priv = data; >>> + >>> + if (test_bit(channel, priv->dimm_mask)) >>> + return 0444; >>> + >>> + return 0; >>> +} >>> + >>> +static const struct hwmon_ops peci_dimmtemp_ops = { >>> + .is_visible = dimmtemp_is_visible, >>> + .read_string = dimmtemp_read_string, >>> + .read = dimmtemp_read, >>> +}; >>> + >>> +static int check_populated_dimms(struct peci_dimmtemp *priv) >>> +{ >>> + int chan_rank_max = priv->gen_info->chan_rank_max; >>> + int dimm_idx_max = priv->gen_info->dimm_idx_max; >>> + u32 chan_rank_empty = 0; >>> + u64 dimm_mask = 0; >>> + int chan_rank, dimm_idx, ret; >>> + u32 pcs; >>> + >>> + BUILD_BUG_ON(CHAN_RANK_MAX > 32); >>> + BUILD_BUG_ON(DIMM_NUMS_MAX > 64); >> >> I don't immediately see the value of those build bugs. What happens if >> CHAN_RANK_MAX > 32 or DIMM_NUMS_MAX > 64 ? Where do those limits come >> from ? > > Supported HW doesn't come near the limit for now - it's just an "artificial" > limit imposed by variables we're using (u64 for dimm_mask and u32 for > chan_rank_empty). > Please use a value derived from the size of those variables for the check to clarify and explain the constraints. Thanks, Guenter
On Wed, 2021-08-04 at 10:33 -0700, Guenter Roeck wrote: > On 8/4/21 3:46 AM, Winiarska, Iwona wrote: > > On Tue, 2021-08-03 at 08:39 -0700, Guenter Roeck wrote: > > > On Tue, Aug 03, 2021 at 01:31:32PM +0200, Iwona Winiarska wrote: > > > > Add peci-dimmtemp driver for Temperature Sensor on DIMM readings that > > > > are accessible via the processor PECI interface. > > > > > > > > The main use case for the driver (and PECI interface) is out-of-band > > > > management, where we're able to obtain thermal readings from an external > > > > entity connected with PECI, e.g. BMC on server platforms. > > > > > > > > Co-developed-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com> > > > > Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com> > > > > Signed-off-by: Iwona Winiarska <iwona.winiarska@intel.com> > > > > Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> > > > > --- > > > > Note that the timeout was completely removed - we're going to probe > > > > for detected DIMMs every 5 seconds until we reach "stable" state of > > > > either getting correct DIMM data or getting all -EINVAL (which > > > > suggest that the CPU doesn't have any DIMMs). > > > > > > > > drivers/hwmon/peci/Kconfig | 13 + > > > > drivers/hwmon/peci/Makefile | 2 + > > > > drivers/hwmon/peci/dimmtemp.c | 614 ++++++++++++++++++++++++++++++++++ > > > > 3 files changed, 629 insertions(+) > > > > create mode 100644 drivers/hwmon/peci/dimmtemp.c > > > > > > > > diff --git a/drivers/hwmon/peci/Kconfig b/drivers/hwmon/peci/Kconfig > > > > index e10eed68d70a..9d32a57badfe 100644 > > > > --- a/drivers/hwmon/peci/Kconfig > > > > +++ b/drivers/hwmon/peci/Kconfig > > > > @@ -14,5 +14,18 @@ config SENSORS_PECI_CPUTEMP > > > > This driver can also be built as a module. If so, the module > > > > will be called peci-cputemp. > > > > > > > > +config SENSORS_PECI_DIMMTEMP > > > > + tristate "PECI DIMM temperature monitoring client" > > > > + depends on PECI > > > > + select SENSORS_PECI > > > > + select PECI_CPU > > > > + help > > > > + If you say yes here you get support for the generic Intel PECI > > > > hwmon > > > > + driver which provides Temperature Sensor on DIMM readings that > > > > are > > > > + accessible via the processor PECI interface. > > > > + > > > > + This driver can also be built as a module. If so, the module > > > > + will be called peci-dimmtemp. > > > > + > > > > config SENSORS_PECI > > > > tristate > > > > diff --git a/drivers/hwmon/peci/Makefile b/drivers/hwmon/peci/Makefile > > > > index e8a0ada5ab1f..191cfa0227f3 100644 > > > > --- a/drivers/hwmon/peci/Makefile > > > > +++ b/drivers/hwmon/peci/Makefile > > > > @@ -1,5 +1,7 @@ > > > > # SPDX-License-Identifier: GPL-2.0-only > > > > > > > > peci-cputemp-y := cputemp.o > > > > +peci-dimmtemp-y := dimmtemp.o > > > > > > > > obj-$(CONFIG_SENSORS_PECI_CPUTEMP) += peci-cputemp.o > > > > +obj-$(CONFIG_SENSORS_PECI_DIMMTEMP) += peci-dimmtemp.o > > > > diff --git a/drivers/hwmon/peci/dimmtemp.c > > > > b/drivers/hwmon/peci/dimmtemp.c > > > > new file mode 100644 > > > > index 000000000000..6264c29bb6c0 > > > > --- /dev/null > > > > +++ b/drivers/hwmon/peci/dimmtemp.c > > > > @@ -0,0 +1,614 @@ > > > > +// SPDX-License-Identifier: GPL-2.0-only > > > > +// Copyright (c) 2018-2021 Intel Corporation > > > > + > > > > +#include <linux/auxiliary_bus.h> > > > > +#include <linux/bitfield.h> > > > > +#include <linux/bitops.h> > > > > +#include <linux/hwmon.h> > > > > +#include <linux/jiffies.h> > > > > +#include <linux/module.h> > > > > +#include <linux/peci.h> > > > > +#include <linux/peci-cpu.h> > > > > +#include <linux/units.h> > > > > +#include <linux/workqueue.h> > > > > +#include <linux/x86/intel-family.h> > > > > + > > > > +#include "common.h" > > > > + > > > > +#define DIMM_MASK_CHECK_DELAY_JIFFIES msecs_to_jiffies(5000) > > > > + > > > > +/* Max number of channel ranks and DIMM index per channel */ > > > > +#define CHAN_RANK_MAX_ON_HSX 8 > > > > +#define DIMM_IDX_MAX_ON_HSX 3 > > > > +#define CHAN_RANK_MAX_ON_BDX 4 > > > > +#define DIMM_IDX_MAX_ON_BDX 3 > > > > +#define CHAN_RANK_MAX_ON_BDXD 2 > > > > +#define DIMM_IDX_MAX_ON_BDXD 2 > > > > +#define CHAN_RANK_MAX_ON_SKX 6 > > > > +#define DIMM_IDX_MAX_ON_SKX 2 > > > > +#define CHAN_RANK_MAX_ON_ICX 8 > > > > +#define DIMM_IDX_MAX_ON_ICX 2 > > > > +#define CHAN_RANK_MAX_ON_ICXD 4 > > > > +#define DIMM_IDX_MAX_ON_ICXD 2 > > > > + > > > > +#define CHAN_RANK_MAX CHAN_RANK_MAX_ON_HSX > > > > +#define DIMM_IDX_MAX DIMM_IDX_MAX_ON_HSX > > > > +#define DIMM_NUMS_MAX (CHAN_RANK_MAX * DIMM_IDX_MAX) > > > > + > > > > +#define CPU_SEG_MASK GENMASK(23, 16) > > > > +#define GET_CPU_SEG(x) (((x) & CPU_SEG_MASK) >> 16) > > > > +#define CPU_BUS_MASK GENMASK(7, 0) > > > > +#define GET_CPU_BUS(x) ((x) & CPU_BUS_MASK) > > > > + > > > > +#define DIMM_TEMP_MAX GENMASK(15, 8) > > > > +#define DIMM_TEMP_CRIT GENMASK(23, 16) > > > > +#define GET_TEMP_MAX(x) (((x) & DIMM_TEMP_MAX) >> 8) > > > > +#define GET_TEMP_CRIT(x) (((x) & DIMM_TEMP_CRIT) >> 16) > > > > + > > > > +struct peci_dimmtemp; > > > > + > > > > +struct dimm_info { > > > > + int chan_rank_max; > > > > + int dimm_idx_max; > > > > + u8 min_peci_revision; > > > > + int (*read_thresholds)(struct peci_dimmtemp *priv, int > > > > dimm_order, > > > > + int chan_rank, u32 *data); > > > > +}; > > > > + > > > > +struct peci_dimm_thresholds { > > > > + long temp_max; > > > > + long temp_crit; > > > > + struct peci_sensor_state state; > > > > +}; > > > > + > > > > +enum peci_dimm_threshold_type { > > > > + temp_max_type, > > > > + temp_crit_type, > > > > +}; > > > > + > > > > +struct peci_dimmtemp { > > > > + struct peci_device *peci_dev; > > > > + struct device *dev; > > > > + const char *name; > > > > + const struct dimm_info *gen_info; > > > > + struct delayed_work detect_work; > > > > + struct { > > > > + struct peci_sensor_data temp; > > > > + struct peci_dimm_thresholds thresholds; > > > > + } dimm[DIMM_NUMS_MAX]; > > > > + char **dimmtemp_label; > > > > + DECLARE_BITMAP(dimm_mask, DIMM_NUMS_MAX); > > > > +}; > > > > + > > > > +static u8 __dimm_temp(u32 reg, int dimm_order) > > > > +{ > > > > + return (reg >> (dimm_order * 8)) & 0xff; > > > > +} > > > > + > > > > +static int get_dimm_temp(struct peci_dimmtemp *priv, int dimm_no, long > > > > *val) > > > > +{ > > > > + int dimm_order = dimm_no % priv->gen_info->dimm_idx_max; > > > > + int chan_rank = dimm_no / priv->gen_info->dimm_idx_max; > > > > + u32 data; > > > > + int ret; > > > > > > int ret = 0; > > > > > > > + > > > > + mutex_lock(&priv->dimm[dimm_no].temp.state.lock); > > > > + if (!peci_sensor_need_update(&priv->dimm[dimm_no].temp.state)) > > > > + goto skip_update; > > > > + > > > > + ret = peci_pcs_read(priv->peci_dev, PECI_PCS_DDR_DIMM_TEMP, > > > > chan_rank, &data); > > > > + if (ret) { > > > > + mutex_unlock(&priv->dimm[dimm_no].temp.state.lock); > > > > + return ret; > > > > + } > > > > > > if (ret) > > > goto unlock; > > > > > > > + > > > > + priv->dimm[dimm_no].temp.value = __dimm_temp(data, dimm_order) * > > > > MILLIDEGREE_PER_DEGREE; > > > > + > > > > + peci_sensor_mark_updated(&priv->dimm[dimm_no].temp.state); > > > > + > > > > +skip_update: > > > > + *val = priv->dimm[dimm_no].temp.value; > > > > > > unlock: > > > > + mutex_unlock(&priv->dimm[dimm_no].temp.state.lock); > > > > + return 0; > > > > > > return ret; > > > > Ack. > > > > > > > > > +} > > > > + > > > > +static int update_thresholds(struct peci_dimmtemp *priv, int dimm_no) > > > > +{ > > > > + int dimm_order = dimm_no % priv->gen_info->dimm_idx_max; > > > > + int chan_rank = dimm_no / priv->gen_info->dimm_idx_max; > > > > + u32 data; > > > > + int ret; > > > > + > > > > + if (!peci_sensor_need_update(&priv- > > > > >dimm[dimm_no].thresholds.state)) > > > > + return 0; > > > > + > > > > + ret = priv->gen_info->read_thresholds(priv, dimm_order, > > > > chan_rank, > > > > &data); > > > > + if (ret == -ENODATA) /* Use default or previous value */ > > > > + return 0; > > > > + if (ret) > > > > + return ret; > > > > + > > > > + priv->dimm[dimm_no].thresholds.temp_max = GET_TEMP_MAX(data) * > > > > MILLIDEGREE_PER_DEGREE; > > > > + priv->dimm[dimm_no].thresholds.temp_crit = GET_TEMP_CRIT(data) * > > > > MILLIDEGREE_PER_DEGREE; > > > > + > > > > + peci_sensor_mark_updated(&priv->dimm[dimm_no].thresholds.state); > > > > + > > > > + return 0; > > > > +} > > > > + > > > > +static int get_dimm_thresholds(struct peci_dimmtemp *priv, enum > > > > peci_dimm_threshold_type type, > > > > + int dimm_no, long *val) > > > > +{ > > > > + int ret; > > > > + > > > > + mutex_lock(&priv->dimm[dimm_no].thresholds.state.lock); > > > > + ret = update_thresholds(priv, dimm_no); > > > > + if (ret) > > > > + goto unlock; > > > > + > > > > + switch (type) { > > > > + case temp_max_type: > > > > + *val = priv->dimm[dimm_no].thresholds.temp_max; > > > > + break; > > > > + case temp_crit_type: > > > > + *val = priv->dimm[dimm_no].thresholds.temp_crit; > > > > + break; > > > > + default: > > > > + ret = -EOPNOTSUPP; > > > > + break; > > > > + } > > > > +unlock: > > > > + mutex_unlock(&priv->dimm[dimm_no].thresholds.state.lock); > > > > + > > > > + return ret; > > > > +} > > > > + > > > > +static int dimmtemp_read_string(struct device *dev, > > > > + enum hwmon_sensor_types type, > > > > + u32 attr, int channel, const char **str) > > > > +{ > > > > + struct peci_dimmtemp *priv = dev_get_drvdata(dev); > > > > + > > > > + if (attr != hwmon_temp_label) > > > > + return -EOPNOTSUPP; > > > > + > > > > + *str = (const char *)priv->dimmtemp_label[channel]; > > > > + > > > > + return 0; > > > > +} > > > > + > > > > +static int dimmtemp_read(struct device *dev, enum hwmon_sensor_types > > > > type, > > > > + u32 attr, int channel, long *val) > > > > +{ > > > > + struct peci_dimmtemp *priv = dev_get_drvdata(dev); > > > > + > > > > + switch (attr) { > > > > + case hwmon_temp_input: > > > > + return get_dimm_temp(priv, channel, val); > > > > + case hwmon_temp_max: > > > > + return get_dimm_thresholds(priv, temp_max_type, channel, > > > > val); > > > > + case hwmon_temp_crit: > > > > + return get_dimm_thresholds(priv, temp_crit_type, > > > > channel, > > > > val); > > > > + default: > > > > + break; > > > > + } > > > > + > > > > + return -EOPNOTSUPP; > > > > +} > > > > + > > > > +static umode_t dimmtemp_is_visible(const void *data, enum > > > > hwmon_sensor_types type, > > > > + u32 attr, int channel) > > > > +{ > > > > + const struct peci_dimmtemp *priv = data; > > > > + > > > > + if (test_bit(channel, priv->dimm_mask)) > > > > + return 0444; > > > > + > > > > + return 0; > > > > +} > > > > + > > > > +static const struct hwmon_ops peci_dimmtemp_ops = { > > > > + .is_visible = dimmtemp_is_visible, > > > > + .read_string = dimmtemp_read_string, > > > > + .read = dimmtemp_read, > > > > +}; > > > > + > > > > +static int check_populated_dimms(struct peci_dimmtemp *priv) > > > > +{ > > > > + int chan_rank_max = priv->gen_info->chan_rank_max; > > > > + int dimm_idx_max = priv->gen_info->dimm_idx_max; > > > > + u32 chan_rank_empty = 0; > > > > + u64 dimm_mask = 0; > > > > + int chan_rank, dimm_idx, ret; > > > > + u32 pcs; > > > > + > > > > + BUILD_BUG_ON(CHAN_RANK_MAX > 32); > > > > + BUILD_BUG_ON(DIMM_NUMS_MAX > 64); > > > > > > I don't immediately see the value of those build bugs. What happens if > > > CHAN_RANK_MAX > 32 or DIMM_NUMS_MAX > 64 ? Where do those limits come > > > from ? > > > > Supported HW doesn't come near the limit for now - it's just an "artificial" > > limit imposed by variables we're using (u64 for dimm_mask and u32 for > > chan_rank_empty). > > > > Please use a value derived from the size of those variables for the check > to clarify and explain the constraints. Sure, I'll use BITS_PER_TYPE. Thanks -Iwona > > Thanks, > Guenter
diff --git a/drivers/hwmon/peci/Kconfig b/drivers/hwmon/peci/Kconfig index e10eed68d70a..9d32a57badfe 100644 --- a/drivers/hwmon/peci/Kconfig +++ b/drivers/hwmon/peci/Kconfig @@ -14,5 +14,18 @@ config SENSORS_PECI_CPUTEMP This driver can also be built as a module. If so, the module will be called peci-cputemp. +config SENSORS_PECI_DIMMTEMP + tristate "PECI DIMM temperature monitoring client" + depends on PECI + select SENSORS_PECI + select PECI_CPU + help + If you say yes here you get support for the generic Intel PECI hwmon + driver which provides Temperature Sensor on DIMM readings that are + accessible via the processor PECI interface. + + This driver can also be built as a module. If so, the module + will be called peci-dimmtemp. + config SENSORS_PECI tristate diff --git a/drivers/hwmon/peci/Makefile b/drivers/hwmon/peci/Makefile index e8a0ada5ab1f..191cfa0227f3 100644 --- a/drivers/hwmon/peci/Makefile +++ b/drivers/hwmon/peci/Makefile @@ -1,5 +1,7 @@ # SPDX-License-Identifier: GPL-2.0-only peci-cputemp-y := cputemp.o +peci-dimmtemp-y := dimmtemp.o obj-$(CONFIG_SENSORS_PECI_CPUTEMP) += peci-cputemp.o +obj-$(CONFIG_SENSORS_PECI_DIMMTEMP) += peci-dimmtemp.o diff --git a/drivers/hwmon/peci/dimmtemp.c b/drivers/hwmon/peci/dimmtemp.c new file mode 100644 index 000000000000..6264c29bb6c0 --- /dev/null +++ b/drivers/hwmon/peci/dimmtemp.c @@ -0,0 +1,614 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Copyright (c) 2018-2021 Intel Corporation + +#include <linux/auxiliary_bus.h> +#include <linux/bitfield.h> +#include <linux/bitops.h> +#include <linux/hwmon.h> +#include <linux/jiffies.h> +#include <linux/module.h> +#include <linux/peci.h> +#include <linux/peci-cpu.h> +#include <linux/units.h> +#include <linux/workqueue.h> +#include <linux/x86/intel-family.h> + +#include "common.h" + +#define DIMM_MASK_CHECK_DELAY_JIFFIES msecs_to_jiffies(5000) + +/* Max number of channel ranks and DIMM index per channel */ +#define CHAN_RANK_MAX_ON_HSX 8 +#define DIMM_IDX_MAX_ON_HSX 3 +#define CHAN_RANK_MAX_ON_BDX 4 +#define DIMM_IDX_MAX_ON_BDX 3 +#define CHAN_RANK_MAX_ON_BDXD 2 +#define DIMM_IDX_MAX_ON_BDXD 2 +#define CHAN_RANK_MAX_ON_SKX 6 +#define DIMM_IDX_MAX_ON_SKX 2 +#define CHAN_RANK_MAX_ON_ICX 8 +#define DIMM_IDX_MAX_ON_ICX 2 +#define CHAN_RANK_MAX_ON_ICXD 4 +#define DIMM_IDX_MAX_ON_ICXD 2 + +#define CHAN_RANK_MAX CHAN_RANK_MAX_ON_HSX +#define DIMM_IDX_MAX DIMM_IDX_MAX_ON_HSX +#define DIMM_NUMS_MAX (CHAN_RANK_MAX * DIMM_IDX_MAX) + +#define CPU_SEG_MASK GENMASK(23, 16) +#define GET_CPU_SEG(x) (((x) & CPU_SEG_MASK) >> 16) +#define CPU_BUS_MASK GENMASK(7, 0) +#define GET_CPU_BUS(x) ((x) & CPU_BUS_MASK) + +#define DIMM_TEMP_MAX GENMASK(15, 8) +#define DIMM_TEMP_CRIT GENMASK(23, 16) +#define GET_TEMP_MAX(x) (((x) & DIMM_TEMP_MAX) >> 8) +#define GET_TEMP_CRIT(x) (((x) & DIMM_TEMP_CRIT) >> 16) + +struct peci_dimmtemp; + +struct dimm_info { + int chan_rank_max; + int dimm_idx_max; + u8 min_peci_revision; + int (*read_thresholds)(struct peci_dimmtemp *priv, int dimm_order, + int chan_rank, u32 *data); +}; + +struct peci_dimm_thresholds { + long temp_max; + long temp_crit; + struct peci_sensor_state state; +}; + +enum peci_dimm_threshold_type { + temp_max_type, + temp_crit_type, +}; + +struct peci_dimmtemp { + struct peci_device *peci_dev; + struct device *dev; + const char *name; + const struct dimm_info *gen_info; + struct delayed_work detect_work; + struct { + struct peci_sensor_data temp; + struct peci_dimm_thresholds thresholds; + } dimm[DIMM_NUMS_MAX]; + char **dimmtemp_label; + DECLARE_BITMAP(dimm_mask, DIMM_NUMS_MAX); +}; + +static u8 __dimm_temp(u32 reg, int dimm_order) +{ + return (reg >> (dimm_order * 8)) & 0xff; +} + +static int get_dimm_temp(struct peci_dimmtemp *priv, int dimm_no, long *val) +{ + int dimm_order = dimm_no % priv->gen_info->dimm_idx_max; + int chan_rank = dimm_no / priv->gen_info->dimm_idx_max; + u32 data; + int ret; + + mutex_lock(&priv->dimm[dimm_no].temp.state.lock); + if (!peci_sensor_need_update(&priv->dimm[dimm_no].temp.state)) + goto skip_update; + + ret = peci_pcs_read(priv->peci_dev, PECI_PCS_DDR_DIMM_TEMP, chan_rank, &data); + if (ret) { + mutex_unlock(&priv->dimm[dimm_no].temp.state.lock); + return ret; + } + + priv->dimm[dimm_no].temp.value = __dimm_temp(data, dimm_order) * MILLIDEGREE_PER_DEGREE; + + peci_sensor_mark_updated(&priv->dimm[dimm_no].temp.state); + +skip_update: + *val = priv->dimm[dimm_no].temp.value; + mutex_unlock(&priv->dimm[dimm_no].temp.state.lock); + return 0; +} + +static int update_thresholds(struct peci_dimmtemp *priv, int dimm_no) +{ + int dimm_order = dimm_no % priv->gen_info->dimm_idx_max; + int chan_rank = dimm_no / priv->gen_info->dimm_idx_max; + u32 data; + int ret; + + if (!peci_sensor_need_update(&priv->dimm[dimm_no].thresholds.state)) + return 0; + + ret = priv->gen_info->read_thresholds(priv, dimm_order, chan_rank, &data); + if (ret == -ENODATA) /* Use default or previous value */ + return 0; + if (ret) + return ret; + + priv->dimm[dimm_no].thresholds.temp_max = GET_TEMP_MAX(data) * MILLIDEGREE_PER_DEGREE; + priv->dimm[dimm_no].thresholds.temp_crit = GET_TEMP_CRIT(data) * MILLIDEGREE_PER_DEGREE; + + peci_sensor_mark_updated(&priv->dimm[dimm_no].thresholds.state); + + return 0; +} + +static int get_dimm_thresholds(struct peci_dimmtemp *priv, enum peci_dimm_threshold_type type, + int dimm_no, long *val) +{ + int ret; + + mutex_lock(&priv->dimm[dimm_no].thresholds.state.lock); + ret = update_thresholds(priv, dimm_no); + if (ret) + goto unlock; + + switch (type) { + case temp_max_type: + *val = priv->dimm[dimm_no].thresholds.temp_max; + break; + case temp_crit_type: + *val = priv->dimm[dimm_no].thresholds.temp_crit; + break; + default: + ret = -EOPNOTSUPP; + break; + } +unlock: + mutex_unlock(&priv->dimm[dimm_no].thresholds.state.lock); + + return ret; +} + +static int dimmtemp_read_string(struct device *dev, + enum hwmon_sensor_types type, + u32 attr, int channel, const char **str) +{ + struct peci_dimmtemp *priv = dev_get_drvdata(dev); + + if (attr != hwmon_temp_label) + return -EOPNOTSUPP; + + *str = (const char *)priv->dimmtemp_label[channel]; + + return 0; +} + +static int dimmtemp_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct peci_dimmtemp *priv = dev_get_drvdata(dev); + + switch (attr) { + case hwmon_temp_input: + return get_dimm_temp(priv, channel, val); + case hwmon_temp_max: + return get_dimm_thresholds(priv, temp_max_type, channel, val); + case hwmon_temp_crit: + return get_dimm_thresholds(priv, temp_crit_type, channel, val); + default: + break; + } + + return -EOPNOTSUPP; +} + +static umode_t dimmtemp_is_visible(const void *data, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + const struct peci_dimmtemp *priv = data; + + if (test_bit(channel, priv->dimm_mask)) + return 0444; + + return 0; +} + +static const struct hwmon_ops peci_dimmtemp_ops = { + .is_visible = dimmtemp_is_visible, + .read_string = dimmtemp_read_string, + .read = dimmtemp_read, +}; + +static int check_populated_dimms(struct peci_dimmtemp *priv) +{ + int chan_rank_max = priv->gen_info->chan_rank_max; + int dimm_idx_max = priv->gen_info->dimm_idx_max; + u32 chan_rank_empty = 0; + u64 dimm_mask = 0; + int chan_rank, dimm_idx, ret; + u32 pcs; + + BUILD_BUG_ON(CHAN_RANK_MAX > 32); + BUILD_BUG_ON(DIMM_NUMS_MAX > 64); + if (chan_rank_max * dimm_idx_max > DIMM_NUMS_MAX) { + WARN_ONCE(1, "Unsupported number of DIMMs"); + return -EINVAL; + } + + for (chan_rank = 0; chan_rank < chan_rank_max; chan_rank++) { + ret = peci_pcs_read(priv->peci_dev, PECI_PCS_DDR_DIMM_TEMP, chan_rank, &pcs); + if (ret) { + /* + * Overall, we expect either success or -EINVAL in + * order to determine whether DIMM is populated or not. + * For anything else - we fall back to defering the + * detection to be performed at a later point in time. + */ + if (ret == -EINVAL) { + chan_rank_empty |= BIT(chan_rank); + continue; + } + + return -EAGAIN; + } + + for (dimm_idx = 0; dimm_idx < dimm_idx_max; dimm_idx++) + if (__dimm_temp(pcs, dimm_idx)) + dimm_mask |= BIT(chan_rank * dimm_idx_max + dimm_idx); + } + + /* If we got all -EINVALs, it means that the CPU doesn't have any DIMMs. */ + if (chan_rank_empty == GENMASK(chan_rank_max - 1, 0)) + return -ENODEV; + + /* + * It's possible that memory training is not done yet. In this case we + * defer the detection to be performed at a later point in time. + */ + if (!dimm_mask) + return -EAGAIN; + + dev_dbg(priv->dev, "Scanned populated DIMMs: %#llx\n", dimm_mask); + + bitmap_from_u64(priv->dimm_mask, dimm_mask); + + return 0; +} + +static int create_dimm_temp_label(struct peci_dimmtemp *priv, int chan) +{ + int rank = chan / priv->gen_info->dimm_idx_max; + int idx = chan % priv->gen_info->dimm_idx_max; + + priv->dimmtemp_label[chan] = devm_kasprintf(priv->dev, GFP_KERNEL, + "DIMM %c%d", 'A' + rank, + idx + 1); + if (!priv->dimmtemp_label[chan]) + return -ENOMEM; + + return 0; +} + +static const u32 peci_dimmtemp_temp_channel_config[] = { + [0 ... DIMM_NUMS_MAX - 1] = HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT, + 0 +}; + +static const struct hwmon_channel_info peci_dimmtemp_temp_channel = { + .type = hwmon_temp, + .config = peci_dimmtemp_temp_channel_config, +}; + +static const struct hwmon_channel_info *peci_dimmtemp_temp_info[] = { + &peci_dimmtemp_temp_channel, + NULL +}; + +static const struct hwmon_chip_info peci_dimmtemp_chip_info = { + .ops = &peci_dimmtemp_ops, + .info = peci_dimmtemp_temp_info, +}; + +static int create_dimm_temp_info(struct peci_dimmtemp *priv) +{ + int ret, i, channels; + struct device *dev; + + /* + * We expect to either find populated DIMMs and carry on with creating + * sensors, or find out that there are no DIMMs populated. + * All other states mean that the platform never reached the state that + * allows to check DIMM state - causing us to retry later on. + */ + ret = check_populated_dimms(priv); + if (ret == -ENODEV) { + dev_dbg(priv->dev, "No DIMMs found\n"); + return 0; + } else if (ret) { + schedule_delayed_work(&priv->detect_work, DIMM_MASK_CHECK_DELAY_JIFFIES); + dev_dbg(priv->dev, "Deferred populating DIMM temp info\n"); + return ret; + } + + channels = priv->gen_info->chan_rank_max * priv->gen_info->dimm_idx_max; + + priv->dimmtemp_label = devm_kzalloc(priv->dev, channels * sizeof(char *), GFP_KERNEL); + if (!priv->dimmtemp_label) + return -ENOMEM; + + for_each_set_bit(i, priv->dimm_mask, DIMM_NUMS_MAX) { + ret = create_dimm_temp_label(priv, i); + if (ret) + return ret; + mutex_init(&priv->dimm[i].thresholds.state.lock); + mutex_init(&priv->dimm[i].temp.state.lock); + } + + dev = devm_hwmon_device_register_with_info(priv->dev, priv->name, priv, + &peci_dimmtemp_chip_info, NULL); + if (IS_ERR(dev)) { + dev_err(priv->dev, "Failed to register hwmon device\n"); + return PTR_ERR(dev); + } + + dev_dbg(priv->dev, "%s: sensor '%s'\n", dev_name(dev), priv->name); + + return 0; +} + +static void create_dimm_temp_info_delayed(struct work_struct *work) +{ + struct peci_dimmtemp *priv = container_of(to_delayed_work(work), + struct peci_dimmtemp, + detect_work); + int ret; + + ret = create_dimm_temp_info(priv); + if (ret && ret != -EAGAIN) + dev_err(priv->dev, "Failed to populate DIMM temp info\n"); +} + +static void remove_delayed_work(void *_priv) +{ + struct peci_dimmtemp *priv = _priv; + + cancel_delayed_work_sync(&priv->detect_work); +} + +static int peci_dimmtemp_probe(struct auxiliary_device *adev, const struct auxiliary_device_id *id) +{ + struct device *dev = &adev->dev; + struct peci_device *peci_dev = to_peci_device(dev->parent); + struct peci_dimmtemp *priv; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->name = devm_kasprintf(dev, GFP_KERNEL, "peci_dimmtemp.cpu%d", + peci_dev->info.socket_id); + if (!priv->name) + return -ENOMEM; + + priv->dev = dev; + priv->peci_dev = peci_dev; + priv->gen_info = (const struct dimm_info *)id->driver_data; + + /* + * This is just a sanity check. Since we're using commands that are + * guaranteed to be supported on a given platform, we should never see + * revision lower than expected. + */ + if (peci_dev->info.peci_revision < priv->gen_info->min_peci_revision) + dev_warn(priv->dev, + "Unexpected PECI revision %#x, some features may be unavailable\n", + peci_dev->info.peci_revision); + + INIT_DELAYED_WORK(&priv->detect_work, create_dimm_temp_info_delayed); + + ret = devm_add_action_or_reset(priv->dev, remove_delayed_work, priv); + if (ret) + return ret; + + ret = create_dimm_temp_info(priv); + if (ret && ret != -EAGAIN) { + dev_err(dev, "Failed to populate DIMM temp info\n"); + return ret; + } + + return 0; +} + +static int +read_thresholds_hsx(struct peci_dimmtemp *priv, int dimm_order, int chan_rank, u32 *data) +{ + u8 dev, func; + u16 reg; + int ret; + + /* + * Device 20, Function 0: IMC 0 channel 0 -> rank 0 + * Device 20, Function 1: IMC 0 channel 1 -> rank 1 + * Device 21, Function 0: IMC 0 channel 2 -> rank 2 + * Device 21, Function 1: IMC 0 channel 3 -> rank 3 + * Device 23, Function 0: IMC 1 channel 0 -> rank 4 + * Device 23, Function 1: IMC 1 channel 1 -> rank 5 + * Device 24, Function 0: IMC 1 channel 2 -> rank 6 + * Device 24, Function 1: IMC 1 channel 3 -> rank 7 + */ + dev = 20 + chan_rank / 2 + chan_rank / 4; + func = chan_rank % 2; + reg = 0x120 + dimm_order * 4; + + ret = peci_pci_local_read(priv->peci_dev, 1, dev, func, reg, data); + if (ret) + return ret; + + return 0; +} + +static int +read_thresholds_bdxd(struct peci_dimmtemp *priv, int dimm_order, int chan_rank, u32 *data) +{ + u8 dev, func; + u16 reg; + int ret; + + /* + * Device 10, Function 2: IMC 0 channel 0 -> rank 0 + * Device 10, Function 6: IMC 0 channel 1 -> rank 1 + * Device 12, Function 2: IMC 1 channel 0 -> rank 2 + * Device 12, Function 6: IMC 1 channel 1 -> rank 3 + */ + dev = 10 + chan_rank / 2 * 2; + func = (chan_rank % 2) ? 6 : 2; + reg = 0x120 + dimm_order * 4; + + ret = peci_pci_local_read(priv->peci_dev, 2, dev, func, reg, data); + if (ret) + return ret; + + return 0; +} + +static int +read_thresholds_skx(struct peci_dimmtemp *priv, int dimm_order, int chan_rank, u32 *data) +{ + u8 dev, func; + u16 reg; + int ret; + + /* + * Device 10, Function 2: IMC 0 channel 0 -> rank 0 + * Device 10, Function 6: IMC 0 channel 1 -> rank 1 + * Device 11, Function 2: IMC 0 channel 2 -> rank 2 + * Device 12, Function 2: IMC 1 channel 0 -> rank 3 + * Device 12, Function 6: IMC 1 channel 1 -> rank 4 + * Device 13, Function 2: IMC 1 channel 2 -> rank 5 + */ + dev = 10 + chan_rank / 3 * 2 + (chan_rank % 3 == 2 ? 1 : 0); + func = chan_rank % 3 == 1 ? 6 : 2; + reg = 0x120 + dimm_order * 4; + + ret = peci_pci_local_read(priv->peci_dev, 2, dev, func, reg, data); + if (ret) + return ret; + + return 0; +} + +static int +read_thresholds_icx(struct peci_dimmtemp *priv, int dimm_order, int chan_rank, u32 *data) +{ + u32 reg_val; + u64 offset; + int ret; + u8 dev; + + ret = peci_ep_pci_local_read(priv->peci_dev, 0, 13, 0, 2, 0xd4, ®_val); + if (ret || !(reg_val & BIT(31))) + return -ENODATA; /* Use default or previous value */ + + ret = peci_ep_pci_local_read(priv->peci_dev, 0, 13, 0, 2, 0xd0, ®_val); + if (ret) + return -ENODATA; /* Use default or previous value */ + + /* + * Device 26, Offset 224e0: IMC 0 channel 0 -> rank 0 + * Device 26, Offset 264e0: IMC 0 channel 1 -> rank 1 + * Device 27, Offset 224e0: IMC 1 channel 0 -> rank 2 + * Device 27, Offset 264e0: IMC 1 channel 1 -> rank 3 + * Device 28, Offset 224e0: IMC 2 channel 0 -> rank 4 + * Device 28, Offset 264e0: IMC 2 channel 1 -> rank 5 + * Device 29, Offset 224e0: IMC 3 channel 0 -> rank 6 + * Device 29, Offset 264e0: IMC 3 channel 1 -> rank 7 + */ + dev = 26 + chan_rank / 2; + offset = 0x224e0 + dimm_order * 4 + (chan_rank % 2) * 0x4000; + + ret = peci_mmio_read(priv->peci_dev, 0, GET_CPU_SEG(reg_val), GET_CPU_BUS(reg_val), + dev, 0, offset, data); + if (ret) + return ret; + + return 0; +} + +static const struct dimm_info dimm_hsx = { + .chan_rank_max = CHAN_RANK_MAX_ON_HSX, + .dimm_idx_max = DIMM_IDX_MAX_ON_HSX, + .min_peci_revision = 0x33, + .read_thresholds = &read_thresholds_hsx, +}; + +static const struct dimm_info dimm_bdx = { + .chan_rank_max = CHAN_RANK_MAX_ON_BDX, + .dimm_idx_max = DIMM_IDX_MAX_ON_BDX, + .min_peci_revision = 0x33, + .read_thresholds = &read_thresholds_hsx, +}; + +static const struct dimm_info dimm_bdxd = { + .chan_rank_max = CHAN_RANK_MAX_ON_BDXD, + .dimm_idx_max = DIMM_IDX_MAX_ON_BDXD, + .min_peci_revision = 0x33, + .read_thresholds = &read_thresholds_bdxd, +}; + +static const struct dimm_info dimm_skx = { + .chan_rank_max = CHAN_RANK_MAX_ON_SKX, + .dimm_idx_max = DIMM_IDX_MAX_ON_SKX, + .min_peci_revision = 0x33, + .read_thresholds = &read_thresholds_skx, +}; + +static const struct dimm_info dimm_icx = { + .chan_rank_max = CHAN_RANK_MAX_ON_ICX, + .dimm_idx_max = DIMM_IDX_MAX_ON_ICX, + .min_peci_revision = 0x40, + .read_thresholds = &read_thresholds_icx, +}; + +static const struct dimm_info dimm_icxd = { + .chan_rank_max = CHAN_RANK_MAX_ON_ICXD, + .dimm_idx_max = DIMM_IDX_MAX_ON_ICXD, + .min_peci_revision = 0x40, + .read_thresholds = &read_thresholds_icx, +}; + +static const struct auxiliary_device_id peci_dimmtemp_ids[] = { + { + .name = "peci_cpu.dimmtemp.hsx", + .driver_data = (kernel_ulong_t)&dimm_hsx, + }, + { + .name = "peci_cpu.dimmtemp.bdx", + .driver_data = (kernel_ulong_t)&dimm_bdx, + }, + { + .name = "peci_cpu.dimmtemp.bdxd", + .driver_data = (kernel_ulong_t)&dimm_bdxd, + }, + { + .name = "peci_cpu.dimmtemp.skx", + .driver_data = (kernel_ulong_t)&dimm_skx, + }, + { + .name = "peci_cpu.dimmtemp.icx", + .driver_data = (kernel_ulong_t)&dimm_icx, + }, + { + .name = "peci_cpu.dimmtemp.icxd", + .driver_data = (kernel_ulong_t)&dimm_icxd, + }, + { } +}; +MODULE_DEVICE_TABLE(auxiliary, peci_dimmtemp_ids); + +static struct auxiliary_driver peci_dimmtemp_driver = { + .probe = peci_dimmtemp_probe, + .id_table = peci_dimmtemp_ids, +}; + +module_auxiliary_driver(peci_dimmtemp_driver); + +MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>"); +MODULE_AUTHOR("Iwona Winiarska <iwona.winiarska@intel.com>"); +MODULE_DESCRIPTION("PECI dimmtemp driver"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(PECI_CPU);