diff options
Diffstat (limited to 'drivers/iommu/amd_iommu_init.c')
| -rw-r--r-- | drivers/iommu/amd_iommu_init.c | 59 |
1 files changed, 25 insertions, 34 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index f977df90d2a4..eb104c719629 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -1,20 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2007-2010 Advanced Micro Devices, Inc. * Author: Joerg Roedel <jroedel@suse.de> * Leo Duran <leo.duran@amd.com> - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published - * by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #define pr_fmt(fmt) "AMD-Vi: " fmt @@ -418,6 +406,9 @@ static void iommu_enable(struct amd_iommu *iommu) static void iommu_disable(struct amd_iommu *iommu) { + if (!iommu->mmio_base) + return; + /* Disable command buffer */ iommu_feature_disable(iommu, CONTROL_CMDBUF_EN); @@ -2337,15 +2328,6 @@ static void __init free_iommu_resources(void) amd_iommu_dev_table = NULL; free_iommu_all(); - -#ifdef CONFIG_GART_IOMMU - /* - * We failed to initialize the AMD IOMMU - try fallback to GART - * if possible. - */ - gart_iommu_init(); - -#endif } /* SB IOAPIC is always on this device in AMD systems */ @@ -2637,8 +2619,6 @@ static int __init state_next(void) init_state = ret ? IOMMU_INIT_ERROR : IOMMU_ACPI_FINISHED; if (init_state == IOMMU_ACPI_FINISHED && amd_iommu_disabled) { pr_info("AMD IOMMU disabled on kernel command-line\n"); - free_dma_resources(); - free_iommu_resources(); init_state = IOMMU_CMDLINE_DISABLED; ret = -EINVAL; } @@ -2679,6 +2659,19 @@ static int __init state_next(void) BUG(); } + if (ret) { + free_dma_resources(); + if (!irq_remapping_enabled) { + disable_iommus(); + free_iommu_resources(); + } else { + struct amd_iommu *iommu; + + uninit_device_table_dma(); + for_each_iommu(iommu) + iommu_flush_all_caches(iommu); + } + } return ret; } @@ -2752,17 +2745,15 @@ static int __init amd_iommu_init(void) int ret; ret = iommu_go_to_state(IOMMU_INITIALIZED); - if (ret) { - free_dma_resources(); - if (!irq_remapping_enabled) { - disable_iommus(); - free_iommu_resources(); - } else { - uninit_device_table_dma(); - for_each_iommu(iommu) - iommu_flush_all_caches(iommu); - } +#ifdef CONFIG_GART_IOMMU + if (ret && list_empty(&amd_iommu_list)) { + /* + * We failed to initialize the AMD IOMMU - try fallback + * to GART if possible. + */ + gart_iommu_init(); } +#endif for_each_iommu(iommu) amd_iommu_debugfs_setup(iommu); |