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linux/drivers/infiniband/hw/mlx5/cmd.c
Leon Romanovsky 91a7c58fce RDMA: Restore ability to fail on PD deallocate 
The IB verbs objects are counted by the kernel and ib_core ensures that
deallocate PD will success so it will be called once all other objects
that depends on PD will be released. This is achieved by managing various
reference counters on such objects.

The mlx5 driver didn't follow this standard flow when allowed DEVX objects
that are not managed by ib_core to be interleaved with the ones under
ib_core responsibility.

In such interleaved scenarios deallocate command can fail and ib_core will
leave uobject in internal DB and attempt to clean it later to free
resources anyway.

This change partially restores returned value from dealloc_pd() for all
drivers, but keeping in mind that non-DEVX devices and kernel verbs paths
shouldn't fail.

Fixes: 21a428a019 ("RDMA: Handle PD allocations by IB/core")
Link: https://lore.kernel.org/r/20200907120921.476363-2-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
2020-09-09 13:57:22 -03:00

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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
* Copyright (c) 2017-2020, Mellanox Technologies inc. All rights reserved.
*/
#include "cmd.h"
int mlx5_cmd_dump_fill_mkey(struct mlx5_core_dev *dev, u32 *mkey)
{
u32 out[MLX5_ST_SZ_DW(query_special_contexts_out)] = {};
u32 in[MLX5_ST_SZ_DW(query_special_contexts_in)] = {};
int err;
MLX5_SET(query_special_contexts_in, in, opcode,
MLX5_CMD_OP_QUERY_SPECIAL_CONTEXTS);
err = mlx5_cmd_exec_inout(dev, query_special_contexts, in, out);
if (!err)
*mkey = MLX5_GET(query_special_contexts_out, out,
dump_fill_mkey);
return err;
}
int mlx5_cmd_null_mkey(struct mlx5_core_dev *dev, u32 *null_mkey)
{
u32 out[MLX5_ST_SZ_DW(query_special_contexts_out)] = {};
u32 in[MLX5_ST_SZ_DW(query_special_contexts_in)] = {};
int err;
MLX5_SET(query_special_contexts_in, in, opcode,
MLX5_CMD_OP_QUERY_SPECIAL_CONTEXTS);
err = mlx5_cmd_exec_inout(dev, query_special_contexts, in, out);
if (!err)
*null_mkey = MLX5_GET(query_special_contexts_out, out,
null_mkey);
return err;
}
int mlx5_cmd_query_cong_params(struct mlx5_core_dev *dev, int cong_point,
void *out)
{
u32 in[MLX5_ST_SZ_DW(query_cong_params_in)] = {};
MLX5_SET(query_cong_params_in, in, opcode,
MLX5_CMD_OP_QUERY_CONG_PARAMS);
MLX5_SET(query_cong_params_in, in, cong_protocol, cong_point);
return mlx5_cmd_exec_inout(dev, query_cong_params, in, out);
}
int mlx5_cmd_alloc_memic(struct mlx5_dm *dm, phys_addr_t *addr,
u64 length, u32 alignment)
{
struct mlx5_core_dev *dev = dm->dev;
u64 num_memic_hw_pages = MLX5_CAP_DEV_MEM(dev, memic_bar_size)
>> PAGE_SHIFT;
u64 hw_start_addr = MLX5_CAP64_DEV_MEM(dev, memic_bar_start_addr);
u32 max_alignment = MLX5_CAP_DEV_MEM(dev, log_max_memic_addr_alignment);
u32 num_pages = DIV_ROUND_UP(length, PAGE_SIZE);
u32 out[MLX5_ST_SZ_DW(alloc_memic_out)] = {};
u32 in[MLX5_ST_SZ_DW(alloc_memic_in)] = {};
u32 mlx5_alignment;
u64 page_idx = 0;
int ret = 0;
if (!length || (length & MLX5_MEMIC_ALLOC_SIZE_MASK))
return -EINVAL;
/* mlx5 device sets alignment as 64*2^driver_value
* so normalizing is needed.
*/
mlx5_alignment = (alignment < MLX5_MEMIC_BASE_ALIGN) ? 0 :
alignment - MLX5_MEMIC_BASE_ALIGN;
if (mlx5_alignment > max_alignment)
return -EINVAL;
MLX5_SET(alloc_memic_in, in, opcode, MLX5_CMD_OP_ALLOC_MEMIC);
MLX5_SET(alloc_memic_in, in, range_size, num_pages * PAGE_SIZE);
MLX5_SET(alloc_memic_in, in, memic_size, length);
MLX5_SET(alloc_memic_in, in, log_memic_addr_alignment,
mlx5_alignment);
while (page_idx < num_memic_hw_pages) {
spin_lock(&dm->lock);
page_idx = bitmap_find_next_zero_area(dm->memic_alloc_pages,
num_memic_hw_pages,
page_idx,
num_pages, 0);
if (page_idx < num_memic_hw_pages)
bitmap_set(dm->memic_alloc_pages,
page_idx, num_pages);
spin_unlock(&dm->lock);
if (page_idx >= num_memic_hw_pages)
break;
MLX5_SET64(alloc_memic_in, in, range_start_addr,
hw_start_addr + (page_idx * PAGE_SIZE));
ret = mlx5_cmd_exec_inout(dev, alloc_memic, in, out);
if (ret) {
spin_lock(&dm->lock);
bitmap_clear(dm->memic_alloc_pages,
page_idx, num_pages);
spin_unlock(&dm->lock);
if (ret == -EAGAIN) {
page_idx++;
continue;
}
return ret;
}
*addr = dev->bar_addr +
MLX5_GET64(alloc_memic_out, out, memic_start_addr);
return 0;
}
return -ENOMEM;
}
void mlx5_cmd_dealloc_memic(struct mlx5_dm *dm, phys_addr_t addr, u64 length)
{
struct mlx5_core_dev *dev = dm->dev;
u64 hw_start_addr = MLX5_CAP64_DEV_MEM(dev, memic_bar_start_addr);
u32 num_pages = DIV_ROUND_UP(length, PAGE_SIZE);
u32 in[MLX5_ST_SZ_DW(dealloc_memic_in)] = {};
u64 start_page_idx;
int err;
addr -= dev->bar_addr;
start_page_idx = (addr - hw_start_addr) >> PAGE_SHIFT;
MLX5_SET(dealloc_memic_in, in, opcode, MLX5_CMD_OP_DEALLOC_MEMIC);
MLX5_SET64(dealloc_memic_in, in, memic_start_addr, addr);
MLX5_SET(dealloc_memic_in, in, memic_size, length);
err = mlx5_cmd_exec_in(dev, dealloc_memic, in);
if (err)
return;
spin_lock(&dm->lock);
bitmap_clear(dm->memic_alloc_pages,
start_page_idx, num_pages);
spin_unlock(&dm->lock);
}
void mlx5_cmd_destroy_tir(struct mlx5_core_dev *dev, u32 tirn, u16 uid)
{
u32 in[MLX5_ST_SZ_DW(destroy_tir_in)] = {};
MLX5_SET(destroy_tir_in, in, opcode, MLX5_CMD_OP_DESTROY_TIR);
MLX5_SET(destroy_tir_in, in, tirn, tirn);
MLX5_SET(destroy_tir_in, in, uid, uid);
mlx5_cmd_exec_in(dev, destroy_tir, in);
}
void mlx5_cmd_destroy_tis(struct mlx5_core_dev *dev, u32 tisn, u16 uid)
{
u32 in[MLX5_ST_SZ_DW(destroy_tis_in)] = {};
MLX5_SET(destroy_tis_in, in, opcode, MLX5_CMD_OP_DESTROY_TIS);
MLX5_SET(destroy_tis_in, in, tisn, tisn);
MLX5_SET(destroy_tis_in, in, uid, uid);
mlx5_cmd_exec_in(dev, destroy_tis, in);
}
void mlx5_cmd_destroy_rqt(struct mlx5_core_dev *dev, u32 rqtn, u16 uid)
{
u32 in[MLX5_ST_SZ_DW(destroy_rqt_in)] = {};
MLX5_SET(destroy_rqt_in, in, opcode, MLX5_CMD_OP_DESTROY_RQT);
MLX5_SET(destroy_rqt_in, in, rqtn, rqtn);
MLX5_SET(destroy_rqt_in, in, uid, uid);
mlx5_cmd_exec_in(dev, destroy_rqt, in);
}
int mlx5_cmd_alloc_transport_domain(struct mlx5_core_dev *dev, u32 *tdn,
u16 uid)
{
u32 in[MLX5_ST_SZ_DW(alloc_transport_domain_in)] = {};
u32 out[MLX5_ST_SZ_DW(alloc_transport_domain_out)] = {};
int err;
MLX5_SET(alloc_transport_domain_in, in, opcode,
MLX5_CMD_OP_ALLOC_TRANSPORT_DOMAIN);
MLX5_SET(alloc_transport_domain_in, in, uid, uid);
err = mlx5_cmd_exec_inout(dev, alloc_transport_domain, in, out);
if (!err)
*tdn = MLX5_GET(alloc_transport_domain_out, out,
transport_domain);
return err;
}
void mlx5_cmd_dealloc_transport_domain(struct mlx5_core_dev *dev, u32 tdn,
u16 uid)
{
u32 in[MLX5_ST_SZ_DW(dealloc_transport_domain_in)] = {};
MLX5_SET(dealloc_transport_domain_in, in, opcode,
MLX5_CMD_OP_DEALLOC_TRANSPORT_DOMAIN);
MLX5_SET(dealloc_transport_domain_in, in, uid, uid);
MLX5_SET(dealloc_transport_domain_in, in, transport_domain, tdn);
mlx5_cmd_exec_in(dev, dealloc_transport_domain, in);
}
int mlx5_cmd_dealloc_pd(struct mlx5_core_dev *dev, u32 pdn, u16 uid)
{
u32 in[MLX5_ST_SZ_DW(dealloc_pd_in)] = {};
MLX5_SET(dealloc_pd_in, in, opcode, MLX5_CMD_OP_DEALLOC_PD);
MLX5_SET(dealloc_pd_in, in, pd, pdn);
MLX5_SET(dealloc_pd_in, in, uid, uid);
return mlx5_cmd_exec_in(dev, dealloc_pd, in);
}
int mlx5_cmd_attach_mcg(struct mlx5_core_dev *dev, union ib_gid *mgid,
u32 qpn, u16 uid)
{
u32 in[MLX5_ST_SZ_DW(attach_to_mcg_in)] = {};
void *gid;
MLX5_SET(attach_to_mcg_in, in, opcode, MLX5_CMD_OP_ATTACH_TO_MCG);
MLX5_SET(attach_to_mcg_in, in, qpn, qpn);
MLX5_SET(attach_to_mcg_in, in, uid, uid);
gid = MLX5_ADDR_OF(attach_to_mcg_in, in, multicast_gid);
memcpy(gid, mgid, sizeof(*mgid));
return mlx5_cmd_exec_in(dev, attach_to_mcg, in);
}
int mlx5_cmd_detach_mcg(struct mlx5_core_dev *dev, union ib_gid *mgid,
u32 qpn, u16 uid)
{
u32 in[MLX5_ST_SZ_DW(detach_from_mcg_in)] = {};
void *gid;
MLX5_SET(detach_from_mcg_in, in, opcode, MLX5_CMD_OP_DETACH_FROM_MCG);
MLX5_SET(detach_from_mcg_in, in, qpn, qpn);
MLX5_SET(detach_from_mcg_in, in, uid, uid);
gid = MLX5_ADDR_OF(detach_from_mcg_in, in, multicast_gid);
memcpy(gid, mgid, sizeof(*mgid));
return mlx5_cmd_exec_in(dev, detach_from_mcg, in);
}
int mlx5_cmd_xrcd_alloc(struct mlx5_core_dev *dev, u32 *xrcdn, u16 uid)
{
u32 out[MLX5_ST_SZ_DW(alloc_xrcd_out)] = {};
u32 in[MLX5_ST_SZ_DW(alloc_xrcd_in)] = {};
int err;
MLX5_SET(alloc_xrcd_in, in, opcode, MLX5_CMD_OP_ALLOC_XRCD);
MLX5_SET(alloc_xrcd_in, in, uid, uid);
err = mlx5_cmd_exec_inout(dev, alloc_xrcd, in, out);
if (!err)
*xrcdn = MLX5_GET(alloc_xrcd_out, out, xrcd);
return err;
}
int mlx5_cmd_xrcd_dealloc(struct mlx5_core_dev *dev, u32 xrcdn, u16 uid)
{
u32 in[MLX5_ST_SZ_DW(dealloc_xrcd_in)] = {};
MLX5_SET(dealloc_xrcd_in, in, opcode, MLX5_CMD_OP_DEALLOC_XRCD);
MLX5_SET(dealloc_xrcd_in, in, xrcd, xrcdn);
MLX5_SET(dealloc_xrcd_in, in, uid, uid);
return mlx5_cmd_exec_in(dev, dealloc_xrcd, in);
}
int mlx5_cmd_mad_ifc(struct mlx5_core_dev *dev, const void *inb, void *outb,
u16 opmod, u8 port)
{
int outlen = MLX5_ST_SZ_BYTES(mad_ifc_out);
int inlen = MLX5_ST_SZ_BYTES(mad_ifc_in);
int err = -ENOMEM;
void *data;
void *resp;
u32 *out;
u32 *in;
in = kzalloc(inlen, GFP_KERNEL);
out = kzalloc(outlen, GFP_KERNEL);
if (!in || !out)
goto out;
MLX5_SET(mad_ifc_in, in, opcode, MLX5_CMD_OP_MAD_IFC);
MLX5_SET(mad_ifc_in, in, op_mod, opmod);
MLX5_SET(mad_ifc_in, in, port, port);
data = MLX5_ADDR_OF(mad_ifc_in, in, mad);
memcpy(data, inb, MLX5_FLD_SZ_BYTES(mad_ifc_in, mad));
err = mlx5_cmd_exec_inout(dev, mad_ifc, in, out);
if (err)
goto out;
resp = MLX5_ADDR_OF(mad_ifc_out, out, response_mad_packet);
memcpy(outb, resp,
MLX5_FLD_SZ_BYTES(mad_ifc_out, response_mad_packet));
out:
kfree(out);
kfree(in);
return err;
}
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