drivers/infiniband/hw/hfi1/sysfs.c

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright(c) 2015-2017 Intel Corporation.
 */

#include <linux/ctype.h>
#include <rdma/ib_sysfs.h>

#include "hfi.h"
#include "mad.h"
#include "trace.h"

static struct hfi1_pportdata *hfi1_get_pportdata_kobj(struct kobject *kobj)
{
	u32 port_num;
	struct ib_device *ibdev = ib_port_sysfs_get_ibdev_kobj(kobj, &port_num);
	struct hfi1_devdata *dd = dd_from_ibdev(ibdev);

	return &dd->pport[port_num - 1];
}

/*
 * Start of per-port congestion control structures and support code
 */

/*
 * Congestion control table size followed by table entries
 */
static ssize_t cc_table_bin_read(struct file *filp, struct kobject *kobj,
				 const struct bin_attribute *bin_attr,
				 char *buf, loff_t pos, size_t count)
{
	int ret;
	struct hfi1_pportdata *ppd = hfi1_get_pportdata_kobj(kobj);
	struct cc_state *cc_state;

	ret = ppd->total_cct_entry * sizeof(struct ib_cc_table_entry_shadow)
		 + sizeof(__be16);

	if (pos > ret)
		return -EINVAL;

	if (count > ret - pos)
		count = ret - pos;

	if (!count)
		return count;

	rcu_read_lock();
	cc_state = get_cc_state(ppd);
	if (!cc_state) {
		rcu_read_unlock();
		return -EINVAL;
	}
	memcpy(buf, (void *)&cc_state->cct + pos, count);
	rcu_read_unlock();

	return count;
}
static const BIN_ATTR_RO(cc_table_bin, PAGE_SIZE);

/*
 * Congestion settings: port control, control map and an array of 16
 * entries for the congestion entries - increase, timer, event log
 * trigger threshold and the minimum injection rate delay.
 */
static ssize_t cc_setting_bin_read(struct file *filp, struct kobject *kobj,
				   const struct bin_attribute *bin_attr,
				   char *buf, loff_t pos, size_t count)
{
	struct hfi1_pportdata *ppd = hfi1_get_pportdata_kobj(kobj);
	int ret;
	struct cc_state *cc_state;

	ret = sizeof(struct opa_congestion_setting_attr_shadow);

	if (pos > ret)
		return -EINVAL;
	if (count > ret - pos)
		count = ret - pos;

	if (!count)
		return count;

	rcu_read_lock();
	cc_state = get_cc_state(ppd);
	if (!cc_state) {
		rcu_read_unlock();
		return -EINVAL;
	}
	memcpy(buf, (void *)&cc_state->cong_setting + pos, count);
	rcu_read_unlock();

	return count;
}
static const BIN_ATTR_RO(cc_setting_bin, PAGE_SIZE);

static const struct bin_attribute *const port_cc_bin_attributes[] = {
	&bin_attr_cc_setting_bin,
	&bin_attr_cc_table_bin,
	NULL
};

static ssize_t cc_prescan_show(struct ib_device *ibdev, u32 port_num,
			       struct ib_port_attribute *attr, char *buf)
{
	struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
	struct hfi1_pportdata *ppd = &dd->pport[port_num - 1];

	return sysfs_emit(buf, "%s\n", ppd->cc_prescan ? "on" : "off");
}

static ssize_t cc_prescan_store(struct ib_device *ibdev, u32 port_num,
				struct ib_port_attribute *attr, const char *buf,
				size_t count)
{
	struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
	struct hfi1_pportdata *ppd = &dd->pport[port_num - 1];

	if (!memcmp(buf, "on", 2))
		ppd->cc_prescan = true;
	else if (!memcmp(buf, "off", 3))
		ppd->cc_prescan = false;

	return count;
}
static IB_PORT_ATTR_ADMIN_RW(cc_prescan);

static struct attribute *port_cc_attributes[] = {
	&ib_port_attr_cc_prescan.attr,
	NULL
};

static const struct attribute_group port_cc_group = {
	.name = "CCMgtA",
	.attrs = port_cc_attributes,
	.bin_attrs_new = port_cc_bin_attributes,
};

/* Start sc2vl */
struct hfi1_sc2vl_attr {
	struct ib_port_attribute attr;
	int sc;
};

static ssize_t sc2vl_attr_show(struct ib_device *ibdev, u32 port_num,
			       struct ib_port_attribute *attr, char *buf)
{
	struct hfi1_sc2vl_attr *sattr =
		container_of(attr, struct hfi1_sc2vl_attr, attr);
	struct hfi1_devdata *dd = dd_from_ibdev(ibdev);

	return sysfs_emit(buf, "%u\n", *((u8 *)dd->sc2vl + sattr->sc));
}

#define HFI1_SC2VL_ATTR(N)                                                     \
	static struct hfi1_sc2vl_attr hfi1_sc2vl_attr_##N = {                  \
		.attr = __ATTR(N, 0444, sc2vl_attr_show, NULL),                \
		.sc = N,                                                       \
	}

HFI1_SC2VL_ATTR(0);
HFI1_SC2VL_ATTR(1);
HFI1_SC2VL_ATTR(2);
HFI1_SC2VL_ATTR(3);
HFI1_SC2VL_ATTR(4);
HFI1_SC2VL_ATTR(5);
HFI1_SC2VL_ATTR(6);
HFI1_SC2VL_ATTR(7);
HFI1_SC2VL_ATTR(8);
HFI1_SC2VL_ATTR(9);
HFI1_SC2VL_ATTR(10);
HFI1_SC2VL_ATTR(11);
HFI1_SC2VL_ATTR(12);
HFI1_SC2VL_ATTR(13);
HFI1_SC2VL_ATTR(14);
HFI1_SC2VL_ATTR(15);
HFI1_SC2VL_ATTR(16);
HFI1_SC2VL_ATTR(17);
HFI1_SC2VL_ATTR(18);
HFI1_SC2VL_ATTR(19);
HFI1_SC2VL_ATTR(20);
HFI1_SC2VL_ATTR(21);
HFI1_SC2VL_ATTR(22);
HFI1_SC2VL_ATTR(23);
HFI1_SC2VL_ATTR(24);
HFI1_SC2VL_ATTR(25);
HFI1_SC2VL_ATTR(26);
HFI1_SC2VL_ATTR(27);
HFI1_SC2VL_ATTR(28);
HFI1_SC2VL_ATTR(29);
HFI1_SC2VL_ATTR(30);
HFI1_SC2VL_ATTR(31);

static struct attribute *port_sc2vl_attributes[] = {
	&hfi1_sc2vl_attr_0.attr.attr,
	&hfi1_sc2vl_attr_1.attr.attr,
	&hfi1_sc2vl_attr_2.attr.attr,
	&hfi1_sc2vl_attr_3.attr.attr,
	&hfi1_sc2vl_attr_4.attr.attr,
	&hfi1_sc2vl_attr_5.attr.attr,
	&hfi1_sc2vl_attr_6.attr.attr,
	&hfi1_sc2vl_attr_7.attr.attr,
	&hfi1_sc2vl_attr_8.attr.attr,
	&hfi1_sc2vl_attr_9.attr.attr,
	&hfi1_sc2vl_attr_10.attr.attr,
	&hfi1_sc2vl_attr_11.attr.attr,
	&hfi1_sc2vl_attr_12.attr.attr,
	&hfi1_sc2vl_attr_13.attr.attr,
	&hfi1_sc2vl_attr_14.attr.attr,
	&hfi1_sc2vl_attr_15.attr.attr,
	&hfi1_sc2vl_attr_16.attr.attr,
	&hfi1_sc2vl_attr_17.attr.attr,
	&hfi1_sc2vl_attr_18.attr.attr,
	&hfi1_sc2vl_attr_19.attr.attr,
	&hfi1_sc2vl_attr_20.attr.attr,
	&hfi1_sc2vl_attr_21.attr.attr,
	&hfi1_sc2vl_attr_22.attr.attr,
	&hfi1_sc2vl_attr_23.attr.attr,
	&hfi1_sc2vl_attr_24.attr.attr,
	&hfi1_sc2vl_attr_25.attr.attr,
	&hfi1_sc2vl_attr_26.attr.attr,
	&hfi1_sc2vl_attr_27.attr.attr,
	&hfi1_sc2vl_attr_28.attr.attr,
	&hfi1_sc2vl_attr_29.attr.attr,
	&hfi1_sc2vl_attr_30.attr.attr,
	&hfi1_sc2vl_attr_31.attr.attr,
	NULL
};

static const struct attribute_group port_sc2vl_group = {
	.name = "sc2vl",
	.attrs = port_sc2vl_attributes,
};
/* End sc2vl */

/* Start sl2sc */
struct hfi1_sl2sc_attr {
	struct ib_port_attribute attr;
	int sl;
};

static ssize_t sl2sc_attr_show(struct ib_device *ibdev, u32 port_num,
			       struct ib_port_attribute *attr, char *buf)
{
	struct hfi1_sl2sc_attr *sattr =
		container_of(attr, struct hfi1_sl2sc_attr, attr);
	struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
	struct hfi1_ibport *ibp = &dd->pport[port_num - 1].ibport_data;

	return sysfs_emit(buf, "%u\n", ibp->sl_to_sc[sattr->sl]);
}

#define HFI1_SL2SC_ATTR(N)                                                     \
	static struct hfi1_sl2sc_attr hfi1_sl2sc_attr_##N = {                  \
		.attr = __ATTR(N, 0444, sl2sc_attr_show, NULL), .sl = N        \
	}

HFI1_SL2SC_ATTR(0);
HFI1_SL2SC_ATTR(1);
HFI1_SL2SC_ATTR(2);
HFI1_SL2SC_ATTR(3);
HFI1_SL2SC_ATTR(4);
HFI1_SL2SC_ATTR(5);
HFI1_SL2SC_ATTR(6);
HFI1_SL2SC_ATTR(7);
HFI1_SL2SC_ATTR(8);
HFI1_SL2SC_ATTR(9);
HFI1_SL2SC_ATTR(10);
HFI1_SL2SC_ATTR(11);
HFI1_SL2SC_ATTR(12);
HFI1_SL2SC_ATTR(13);
HFI1_SL2SC_ATTR(14);
HFI1_SL2SC_ATTR(15);
HFI1_SL2SC_ATTR(16);
HFI1_SL2SC_ATTR(17);
HFI1_SL2SC_ATTR(18);
HFI1_SL2SC_ATTR(19);
HFI1_SL2SC_ATTR(20);
HFI1_SL2SC_ATTR(21);
HFI1_SL2SC_ATTR(22);
HFI1_SL2SC_ATTR(23);
HFI1_SL2SC_ATTR(24);
HFI1_SL2SC_ATTR(25);
HFI1_SL2SC_ATTR(26);
HFI1_SL2SC_ATTR(27);
HFI1_SL2SC_ATTR(28);
HFI1_SL2SC_ATTR(29);
HFI1_SL2SC_ATTR(30);
HFI1_SL2SC_ATTR(31);

static struct attribute *port_sl2sc_attributes[] = {
	&hfi1_sl2sc_attr_0.attr.attr,
	&hfi1_sl2sc_attr_1.attr.attr,
	&hfi1_sl2sc_attr_2.attr.attr,
	&hfi1_sl2sc_attr_3.attr.attr,
	&hfi1_sl2sc_attr_4.attr.attr,
	&hfi1_sl2sc_attr_5.attr.attr,
	&hfi1_sl2sc_attr_6.attr.attr,
	&hfi1_sl2sc_attr_7.attr.attr,
	&hfi1_sl2sc_attr_8.attr.attr,
	&hfi1_sl2sc_attr_9.attr.attr,
	&hfi1_sl2sc_attr_10.attr.attr,
	&hfi1_sl2sc_attr_11.attr.attr,
	&hfi1_sl2sc_attr_12.attr.attr,
	&hfi1_sl2sc_attr_13.attr.attr,
	&hfi1_sl2sc_attr_14.attr.attr,
	&hfi1_sl2sc_attr_15.attr.attr,
	&hfi1_sl2sc_attr_16.attr.attr,
	&hfi1_sl2sc_attr_17.attr.attr,
	&hfi1_sl2sc_attr_18.attr.attr,
	&hfi1_sl2sc_attr_19.attr.attr,
	&hfi1_sl2sc_attr_20.attr.attr,
	&hfi1_sl2sc_attr_21.attr.attr,
	&hfi1_sl2sc_attr_22.attr.attr,
	&hfi1_sl2sc_attr_23.attr.attr,
	&hfi1_sl2sc_attr_24.attr.attr,
	&hfi1_sl2sc_attr_25.attr.attr,
	&hfi1_sl2sc_attr_26.attr.attr,
	&hfi1_sl2sc_attr_27.attr.attr,
	&hfi1_sl2sc_attr_28.attr.attr,
	&hfi1_sl2sc_attr_29.attr.attr,
	&hfi1_sl2sc_attr_30.attr.attr,
	&hfi1_sl2sc_attr_31.attr.attr,
	NULL
};

static const struct attribute_group port_sl2sc_group = {
	.name = "sl2sc",
	.attrs = port_sl2sc_attributes,
};

/* End sl2sc */

/* Start vl2mtu */

struct hfi1_vl2mtu_attr {
	struct ib_port_attribute attr;
	int vl;
};

static ssize_t vl2mtu_attr_show(struct ib_device *ibdev, u32 port_num,
				struct ib_port_attribute *attr, char *buf)
{
	struct hfi1_vl2mtu_attr *vlattr =
		container_of(attr, struct hfi1_vl2mtu_attr, attr);
	struct hfi1_devdata *dd = dd_from_ibdev(ibdev);

	return sysfs_emit(buf, "%u\n", dd->vld[vlattr->vl].mtu);
}

#define HFI1_VL2MTU_ATTR(N)                                                    \
	static struct hfi1_vl2mtu_attr hfi1_vl2mtu_attr_##N = {                \
		.attr = __ATTR(N, 0444, vl2mtu_attr_show, NULL),               \
		.vl = N,                                                       \
	}

HFI1_VL2MTU_ATTR(0);
HFI1_VL2MTU_ATTR(1);
HFI1_VL2MTU_ATTR(2);
HFI1_VL2MTU_ATTR(3);
HFI1_VL2MTU_ATTR(4);
HFI1_VL2MTU_ATTR(5);
HFI1_VL2MTU_ATTR(6);
HFI1_VL2MTU_ATTR(7);
HFI1_VL2MTU_ATTR(8);
HFI1_VL2MTU_ATTR(9);
HFI1_VL2MTU_ATTR(10);
HFI1_VL2MTU_ATTR(11);
HFI1_VL2MTU_ATTR(12);
HFI1_VL2MTU_ATTR(13);
HFI1_VL2MTU_ATTR(14);
HFI1_VL2MTU_ATTR(15);

static struct attribute *port_vl2mtu_attributes[] = {
	&hfi1_vl2mtu_attr_0.attr.attr,
	&hfi1_vl2mtu_attr_1.attr.attr,
	&hfi1_vl2mtu_attr_2.attr.attr,
	&hfi1_vl2mtu_attr_3.attr.attr,
	&hfi1_vl2mtu_attr_4.attr.attr,
	&hfi1_vl2mtu_attr_5.attr.attr,
	&hfi1_vl2mtu_attr_6.attr.attr,
	&hfi1_vl2mtu_attr_7.attr.attr,
	&hfi1_vl2mtu_attr_8.attr.attr,
	&hfi1_vl2mtu_attr_9.attr.attr,
	&hfi1_vl2mtu_attr_10.attr.attr,
	&hfi1_vl2mtu_attr_11.attr.attr,
	&hfi1_vl2mtu_attr_12.attr.attr,
	&hfi1_vl2mtu_attr_13.attr.attr,
	&hfi1_vl2mtu_attr_14.attr.attr,
	&hfi1_vl2mtu_attr_15.attr.attr,
	NULL
};

static const struct attribute_group port_vl2mtu_group = {
	.name = "vl2mtu",
	.attrs = port_vl2mtu_attributes,
};

/* end of per-port file structures and support code */

/*
 * Start of per-unit (or driver, in some cases, but replicated
 * per unit) functions (these get a device *)
 */
static ssize_t hw_rev_show(struct device *device, struct device_attribute *attr,
			   char *buf)
{
	struct hfi1_ibdev *dev =
		rdma_device_to_drv_device(device, struct hfi1_ibdev, rdi.ibdev);

	return sysfs_emit(buf, "%x\n", dd_from_dev(dev)->minrev);
}
static DEVICE_ATTR_RO(hw_rev);

static ssize_t board_id_show(struct device *device,
			     struct device_attribute *attr, char *buf)
{
	struct hfi1_ibdev *dev =
		rdma_device_to_drv_device(device, struct hfi1_ibdev, rdi.ibdev);
	struct hfi1_devdata *dd = dd_from_dev(dev);

	if (!dd->boardname)
		return -EINVAL;

	return sysfs_emit(buf, "%s\n", dd->boardname);
}
static DEVICE_ATTR_RO(board_id);

static ssize_t boardversion_show(struct device *device,
				 struct device_attribute *attr, char *buf)
{
	struct hfi1_ibdev *dev =
		rdma_device_to_drv_device(device, struct hfi1_ibdev, rdi.ibdev);
	struct hfi1_devdata *dd = dd_from_dev(dev);

	/* The string printed here is already newline-terminated. */
	return sysfs_emit(buf, "%s", dd->boardversion);
}
static DEVICE_ATTR_RO(boardversion);

static ssize_t nctxts_show(struct device *device,
			   struct device_attribute *attr, char *buf)
{
	struct hfi1_ibdev *dev =
		rdma_device_to_drv_device(device, struct hfi1_ibdev, rdi.ibdev);
	struct hfi1_devdata *dd = dd_from_dev(dev);

	/*
	 * Return the smaller of send and receive contexts.
	 * Normally, user level applications would require both a send
	 * and a receive context, so returning the smaller of the two counts
	 * give a more accurate picture of total contexts available.
	 */
	return sysfs_emit(buf, "%u\n",
			  min(dd->num_user_contexts,
			      (u32)dd->sc_sizes[SC_USER].count));
}
static DEVICE_ATTR_RO(nctxts);

static ssize_t nfreectxts_show(struct device *device,
			       struct device_attribute *attr, char *buf)
{
	struct hfi1_ibdev *dev =
		rdma_device_to_drv_device(device, struct hfi1_ibdev, rdi.ibdev);
	struct hfi1_devdata *dd = dd_from_dev(dev);

	/* Return the number of free user ports (contexts) available. */
	return sysfs_emit(buf, "%u\n", dd->freectxts);
}
static DEVICE_ATTR_RO(nfreectxts);

static ssize_t serial_show(struct device *device,
			   struct device_attribute *attr, char *buf)
{
	struct hfi1_ibdev *dev =
		rdma_device_to_drv_device(device, struct hfi1_ibdev, rdi.ibdev);
	struct hfi1_devdata *dd = dd_from_dev(dev);

	/* dd->serial is already newline terminated in chip.c */
	return sysfs_emit(buf, "%s", dd->serial);
}
static DEVICE_ATTR_RO(serial);

static ssize_t chip_reset_store(struct device *device,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	struct hfi1_ibdev *dev =
		rdma_device_to_drv_device(device, struct hfi1_ibdev, rdi.ibdev);
	struct hfi1_devdata *dd = dd_from_dev(dev);
	int ret;

	if (count < 5 || memcmp(buf, "reset", 5) || !dd->diag_client) {
		ret = -EINVAL;
		goto bail;
	}

	ret = hfi1_reset_device(dd->unit);
bail:
	return ret < 0 ? ret : count;
}
static DEVICE_ATTR_WO(chip_reset);

/*
 * Convert the reported temperature from an integer (reported in
 * units of 0.25C) to a floating point number.
 */
#define temp_d(t) ((t) >> 2)
#define temp_f(t) (((t)&0x3) * 25u)

/*
 * Dump tempsense values, in decimal, to ease shell-scripts.
 */
static ssize_t tempsense_show(struct device *device,
			      struct device_attribute *attr, char *buf)
{
	struct hfi1_ibdev *dev =
		rdma_device_to_drv_device(device, struct hfi1_ibdev, rdi.ibdev);
	struct hfi1_devdata *dd = dd_from_dev(dev);
	struct hfi1_temp temp;
	int ret;

	ret = hfi1_tempsense_rd(dd, &temp);
	if (ret)
		return ret;

	return sysfs_emit(buf, "%u.%02u %u.%02u %u.%02u %u.%02u %u %u %u\n",
			  temp_d(temp.curr), temp_f(temp.curr),
			  temp_d(temp.lo_lim), temp_f(temp.lo_lim),
			  temp_d(temp.hi_lim), temp_f(temp.hi_lim),
			  temp_d(temp.crit_lim), temp_f(temp.crit_lim),
			  temp.triggers & 0x1,
			  temp.triggers & 0x2,
			  temp.triggers & 0x4);
}
static DEVICE_ATTR_RO(tempsense);

/*
 * end of per-unit (or driver, in some cases, but replicated
 * per unit) functions
 */

/* start of per-unit file structures and support code */
static struct attribute *hfi1_attributes[] = {
	&dev_attr_hw_rev.attr,
	&dev_attr_board_id.attr,
	&dev_attr_nctxts.attr,
	&dev_attr_nfreectxts.attr,
	&dev_attr_serial.attr,
	&dev_attr_boardversion.attr,
	&dev_attr_tempsense.attr,
	&dev_attr_chip_reset.attr,
	NULL,
};

const struct attribute_group ib_hfi1_attr_group = {
	.attrs = hfi1_attributes,
};

const struct attribute_group *hfi1_attr_port_groups[] = {
	&port_cc_group,
	&port_sc2vl_group,
	&port_sl2sc_group,
	&port_vl2mtu_group,
	NULL,
};

struct sde_attribute {
	struct attribute attr;
	ssize_t (*show)(struct sdma_engine *sde, char *buf);
	ssize_t (*store)(struct sdma_engine *sde, const char *buf, size_t cnt);
};

static ssize_t sde_show(struct kobject *kobj, struct attribute *attr, char *buf)
{
	struct sde_attribute *sde_attr =
		container_of(attr, struct sde_attribute, attr);
	struct sdma_engine *sde =
		container_of(kobj, struct sdma_engine, kobj);

	if (!sde_attr->show)
		return -EINVAL;

	return sde_attr->show(sde, buf);
}

static ssize_t sde_store(struct kobject *kobj, struct attribute *attr,
			 const char *buf, size_t count)
{
	struct sde_attribute *sde_attr =
		container_of(attr, struct sde_attribute, attr);
	struct sdma_engine *sde =
		container_of(kobj, struct sdma_engine, kobj);

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (!sde_attr->store)
		return -EINVAL;

	return sde_attr->store(sde, buf, count);
}

static const struct sysfs_ops sde_sysfs_ops = {
	.show = sde_show,
	.store = sde_store,
};

static struct kobj_type sde_ktype = {
	.sysfs_ops = &sde_sysfs_ops,
};

#define SDE_ATTR(_name, _mode, _show, _store) \
	struct sde_attribute sde_attr_##_name = \
		__ATTR(_name, _mode, _show, _store)

static ssize_t sde_show_cpu_to_sde_map(struct sdma_engine *sde, char *buf)
{
	return sdma_get_cpu_to_sde_map(sde, buf);
}

static ssize_t sde_store_cpu_to_sde_map(struct sdma_engine *sde,
					const char *buf, size_t count)
{
	return sdma_set_cpu_to_sde_map(sde, buf, count);
}

static ssize_t sde_show_vl(struct sdma_engine *sde, char *buf)
{
	int vl;

	vl = sdma_engine_get_vl(sde);
	if (vl < 0)
		return vl;

	return sysfs_emit(buf, "%d\n", vl);
}

static SDE_ATTR(cpu_list, S_IWUSR | S_IRUGO,
		sde_show_cpu_to_sde_map,
		sde_store_cpu_to_sde_map);
static SDE_ATTR(vl, S_IRUGO, sde_show_vl, NULL);

static struct sde_attribute *sde_attribs[] = {
	&sde_attr_cpu_list,
	&sde_attr_vl
};

/*
 * Register and create our files in /sys/class/infiniband.
 */
int hfi1_verbs_register_sysfs(struct hfi1_devdata *dd)
{
	struct ib_device *dev = &dd->verbs_dev.rdi.ibdev;
	struct device *class_dev = &dev->dev;
	int i, j, ret;

	for (i = 0; i < dd->num_sdma; i++) {
		ret = kobject_init_and_add(&dd->per_sdma[i].kobj,
					   &sde_ktype, &class_dev->kobj,
					   "sdma%d", i);
		if (ret)
			goto bail;

		for (j = 0; j < ARRAY_SIZE(sde_attribs); j++) {
			ret = sysfs_create_file(&dd->per_sdma[i].kobj,
						&sde_attribs[j]->attr);
			if (ret)
				goto bail;
		}
	}

	return 0;
bail:
	/*
	 * The function kobject_put() will call kobject_del() if the kobject
	 * has been added successfully. The sysfs files created under the
	 * kobject directory will also be removed during the process.
	 */
	for (; i >= 0; i--)
		kobject_put(&dd->per_sdma[i].kobj);

	return ret;
}

/*
 * Unregister and remove our files in /sys/class/infiniband.
 */
void hfi1_verbs_unregister_sysfs(struct hfi1_devdata *dd)
{
	int i;

	/* Unwind operations in hfi1_verbs_register_sysfs() */
	for (i = 0; i < dd->num_sdma; i++)
		kobject_put(&dd->per_sdma[i].kobj);
}