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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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7644264082
If an mlx4 device with default FW (which gives a UAR BAR size of 8 MB) is used in a system with 64 KB pages, then there are only 8192/64==128 UAR pages available. However, the first 128 UAR pages are reserved for use with event queue doorbells, so no UAR pages are available to do anything else with, which means that the driver cannot work. The current driver fails with a fairly cryptic "Failed to allocate driver access region, aborting" message in this situation. Fix the driver to detect the problem earlier and print out a clearer description of the problem and a suggestion of how to fix it (use a new firmware image). Signed-off-by: Roland Dreier <rolandd@cisco.com>
110 lines
3.2 KiB
C
110 lines
3.2 KiB
C
/*
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* Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <asm/page.h>
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#include "mlx4.h"
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#include "icm.h"
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int mlx4_pd_alloc(struct mlx4_dev *dev, u32 *pdn)
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{
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struct mlx4_priv *priv = mlx4_priv(dev);
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*pdn = mlx4_bitmap_alloc(&priv->pd_bitmap);
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if (*pdn == -1)
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return -ENOMEM;
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return 0;
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}
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EXPORT_SYMBOL_GPL(mlx4_pd_alloc);
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void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn)
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{
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mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn);
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}
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EXPORT_SYMBOL_GPL(mlx4_pd_free);
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int mlx4_init_pd_table(struct mlx4_dev *dev)
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{
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struct mlx4_priv *priv = mlx4_priv(dev);
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return mlx4_bitmap_init(&priv->pd_bitmap, dev->caps.num_pds,
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(1 << 24) - 1, dev->caps.reserved_pds);
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}
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void mlx4_cleanup_pd_table(struct mlx4_dev *dev)
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{
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mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap);
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}
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int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar)
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{
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uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap);
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if (uar->index == -1)
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return -ENOMEM;
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uar->pfn = (pci_resource_start(dev->pdev, 2) >> PAGE_SHIFT) + uar->index;
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return 0;
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}
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EXPORT_SYMBOL_GPL(mlx4_uar_alloc);
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void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar)
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{
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mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index);
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}
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EXPORT_SYMBOL_GPL(mlx4_uar_free);
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int mlx4_init_uar_table(struct mlx4_dev *dev)
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{
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if (dev->caps.num_uars <= 128) {
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mlx4_err(dev, "Only %d UAR pages (need more than 128)\n",
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dev->caps.num_uars);
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mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n");
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return -ENODEV;
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}
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return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap,
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dev->caps.num_uars, dev->caps.num_uars - 1,
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max(128, dev->caps.reserved_uars));
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}
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void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
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{
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mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
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}
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