479134e9d4
VFIO requires at least one IOMMU group to be added to the VFIO container to be able to perform any IOMMU operations on that container. [1] Without any groups added, VFIO_IOMMU_MAP_DMA would always respond with errno 22 (Invalid argument). Also, if the last IOMMU group is removed from the container (device hotremove), all the IOMMU mappings are lost. In both cases we need to remap vfio memory as soon as the first IOMMU group is attached. The attach is done inside DPDK during device attach and we can't hook into it directly. Instead, this patch hooks into our PCI init/fini callbacks. There's now a PCI device ref counter in our vfio manager and a history of all registered memory pages. When the refcount is increased from 0 to 1, the vtophys will remap all vfio dma memory. [1] https://www.kernel.org/doc/Documentation/vfio.txt "On its own, the container provides little functionality, with all but a couple version and extension query interfaces locked away. The user needs to add a group into the container for the next level of functionality. [...] With a group (or groups) attached to a container, the remaining ioctls become available, enabling access to the VFIO IOMMU interfaces." Change-Id: I744e07043dbe7ffd433fc95d604dad39647675f4 Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Reviewed-on: https://review.gerrithub.io/390655 Tested-by: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Pawel Wodkowski <pawelx.wodkowski@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com>
103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright (c) Intel Corporation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SPDK_ENV_INTERNAL_H
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#define SPDK_ENV_INTERNAL_H
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#include "spdk/stdinc.h"
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#define spdk_pci_device rte_pci_device
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#include "spdk/env.h"
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#include <rte_config.h>
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#include <rte_version.h>
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#include <rte_eal.h>
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#if RTE_VERSION >= RTE_VERSION_NUM(17, 05, 0, 0)
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#include <rte_bus.h>
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extern struct rte_pci_bus rte_pci_bus;
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#endif
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#include <rte_pci.h>
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#if RTE_VERSION >= RTE_VERSION_NUM(17, 11, 0, 1)
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#include <rte_bus_pci.h>
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#endif
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#include <rte_dev.h>
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/* x86-64 userspace virtual addresses use only the low 47 bits [0..46],
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* which is enough to cover 128 TB.
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*/
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#define SHIFT_128TB 47 /* (1 << 47) == 128 TB */
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#define MASK_128TB ((1ULL << SHIFT_128TB) - 1)
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#define SHIFT_1GB 30 /* (1 << 30) == 1 GB */
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#define MASK_1GB ((1ULL << SHIFT_1GB) - 1)
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#define SHIFT_2MB 21 /* (1 << 21) == 2MB */
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#define MASK_2MB ((1ULL << SHIFT_2MB) - 1)
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#define VALUE_2MB (1 << SHIFT_2MB)
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#define SHIFT_4KB 12 /* (1 << 12) == 4KB */
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#define MASK_4KB ((1ULL << SHIFT_4KB) - 1)
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struct spdk_pci_enum_ctx {
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struct rte_pci_driver driver;
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spdk_pci_enum_cb cb_fn;
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void *cb_arg;
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pthread_mutex_t mtx;
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bool is_registered;
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};
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int spdk_pci_device_init(struct rte_pci_driver *driver, struct rte_pci_device *device);
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int spdk_pci_device_fini(struct rte_pci_device *device);
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int spdk_pci_enumerate(struct spdk_pci_enum_ctx *ctx, spdk_pci_enum_cb enum_cb, void *enum_ctx);
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int spdk_pci_device_attach(struct spdk_pci_enum_ctx *ctx, spdk_pci_enum_cb enum_cb, void *enum_ctx,
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struct spdk_pci_addr *pci_address);
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void spdk_mem_map_init(void);
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void spdk_vtophys_init(void);
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/**
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* Increase the refcount of active DMA-capable devices managed by SPDK.
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* This must be called after a `rte_pci_device` is created.
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*/
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void spdk_vtophys_get_ref(void);
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/**
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* Decrease the refcount of active DMA-capable devices managed by SPDK.
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* This must be called before a `rte_pci_device` is destroyed.
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*/
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void spdk_vtophys_put_ref(void);
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#endif
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