cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ecpf.c (2367B)

      1/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
      2/* Copyright (c) 2019 Mellanox Technologies. */
      3
      4#include "ecpf.h"
      5
      6bool mlx5_read_embedded_cpu(struct mlx5_core_dev *dev)
      7{
      8	return (ioread32be(&dev->iseg->initializing) >> MLX5_ECPU_BIT_NUM) & 1;
      9}
     10
     11static bool mlx5_ecpf_esw_admins_host_pf(const struct mlx5_core_dev *dev)
     12{
     13	/* In separate host mode, PF enables itself.
     14	 * When ECPF is eswitch manager, eswitch enables host PF after
     15	 * eswitch is setup.
     16	 */
     17	return mlx5_core_is_ecpf_esw_manager(dev);
     18}
     19
     20int mlx5_cmd_host_pf_enable_hca(struct mlx5_core_dev *dev)
     21{
     22	u32 out[MLX5_ST_SZ_DW(enable_hca_out)] = {};
     23	u32 in[MLX5_ST_SZ_DW(enable_hca_in)]   = {};
     24
     25	MLX5_SET(enable_hca_in, in, opcode, MLX5_CMD_OP_ENABLE_HCA);
     26	MLX5_SET(enable_hca_in, in, function_id, 0);
     27	MLX5_SET(enable_hca_in, in, embedded_cpu_function, 0);
     28	return mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
     29}
     30
     31int mlx5_cmd_host_pf_disable_hca(struct mlx5_core_dev *dev)
     32{
     33	u32 out[MLX5_ST_SZ_DW(disable_hca_out)] = {};
     34	u32 in[MLX5_ST_SZ_DW(disable_hca_in)]   = {};
     35
     36	MLX5_SET(disable_hca_in, in, opcode, MLX5_CMD_OP_DISABLE_HCA);
     37	MLX5_SET(disable_hca_in, in, function_id, 0);
     38	MLX5_SET(disable_hca_in, in, embedded_cpu_function, 0);
     39	return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
     40}
     41
     42static int mlx5_host_pf_init(struct mlx5_core_dev *dev)
     43{
     44	int err;
     45
     46	if (mlx5_ecpf_esw_admins_host_pf(dev))
     47		return 0;
     48
     49	/* ECPF shall enable HCA for host PF in the same way a PF
     50	 * does this for its VFs when ECPF is not a eswitch manager.
     51	 */
     52	err = mlx5_cmd_host_pf_enable_hca(dev);
     53	if (err)
     54		mlx5_core_err(dev, "Failed to enable external host PF HCA err(%d)\n", err);
     55
     56	return err;
     57}
     58
     59static void mlx5_host_pf_cleanup(struct mlx5_core_dev *dev)
     60{
     61	int err;
     62
     63	if (mlx5_ecpf_esw_admins_host_pf(dev))
     64		return;
     65
     66	err = mlx5_cmd_host_pf_disable_hca(dev);
     67	if (err) {
     68		mlx5_core_err(dev, "Failed to disable external host PF HCA err(%d)\n", err);
     69		return;
     70	}
     71}
     72
     73int mlx5_ec_init(struct mlx5_core_dev *dev)
     74{
     75	if (!mlx5_core_is_ecpf(dev))
     76		return 0;
     77
     78	return mlx5_host_pf_init(dev);
     79}
     80
     81void mlx5_ec_cleanup(struct mlx5_core_dev *dev)
     82{
     83	int err;
     84
     85	if (!mlx5_core_is_ecpf(dev))
     86		return;
     87
     88	mlx5_host_pf_cleanup(dev);
     89
     90	err = mlx5_wait_for_pages(dev, &dev->priv.host_pf_pages);
     91	if (err)
     92		mlx5_core_warn(dev, "Timeout reclaiming external host PF pages err(%d)\n", err);
     93}