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From: santosh <santosh.shukla@caviumnetworks.com>
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Subject: Re: [dpdk-dev] [PATCH v3 04/11] linuxapp/eal_pci: get iommu class
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Hi Sergio,
On Wednesday 12 July 2017 01:50 PM, Sergio Gonzalez Monroy wrote:
> On 11/07/2017 07:16, Santosh Shukla wrote:
>> Get iommu class of PCI device on the bus and returns preferred iova
>> mapping mode for that bus.
>>
>> Algorithm for iova scheme selection for PCI bus:
>> 0. Look for device attached to vfio kdrv and has .drv_flag set
>> to RTE_PCI_DRV_NEED_IOVA_VA.
>> 1. Look for any device attached to UIO class of driver.
>> 2. Check for vfio-noiommu mode enabled.
>>
>> If 1) & 2) is false and 0) is true then select
>> mapping scheme as iova=va. Otherwise use default
>> mapping scheme (iova_pa).
>>
>> Signed-off-by: Santosh Shukla <santosh.shukla@caviumnetworks.com>
>> Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
>> ---
>> v1 --> v2:
>> - Removed Linux version check in vfio_noiommu func. Refer [1].
>> - Extending autodetction logic for _iommu_class.
>> Refer [2].
>>
>> [1] https://www.mail-archive.com/dev@dpdk.org/msg70108.html
>> [2] https://www.mail-archive.com/dev@dpdk.org/msg70279.html
>
> Just wondering how it all works with device hotplug.
> Correct me if I am wrong but if EAL decides to use IOVA_AS_VA scheme,
> if we were to attach a device that needs IOVA_AS_PA, it will not work and should fail to attach, right?
>
It will work for igb_uio case, and won't work for vfio-noiommu hotplug case(Invalid case).
Yes, we can dictate iova awareness to hotplug/unplug area.
> Thanks,
> Sergio
>
>> lib/librte_eal/linuxapp/eal/eal_pci.c | 66 +++++++++++++++++++++++++
>> lib/librte_eal/linuxapp/eal/eal_vfio.c | 19 +++++++
>> lib/librte_eal/linuxapp/eal/eal_vfio.h | 4 ++
>> lib/librte_eal/linuxapp/eal/rte_eal_version.map | 1 +
>> 4 files changed, 90 insertions(+)
>>
>> diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
>> index 7d9e1a99b..573caa000 100644
>> --- a/lib/librte_eal/linuxapp/eal/eal_pci.c
>> +++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
>> @@ -45,6 +45,7 @@
>> #include "eal_filesystem.h"
>> #include "eal_private.h"
>> #include "eal_pci_init.h"
>> +#include "eal_vfio.h"
>> /**
>> * @file
>> @@ -488,6 +489,71 @@ rte_pci_scan(void)
>> return -1;
>> }
>> +/*
>> + * Any one of the device bound to uio
>> + */
>> +static inline int
>> +pci_device_bound_uio(void)
>> +{
>> + struct rte_pci_device *dev = NULL;
>> +
>> + FOREACH_DEVICE_ON_PCIBUS(dev) {
>> + if (dev->kdrv == RTE_KDRV_IGB_UIO ||
>> + dev->kdrv == RTE_KDRV_UIO_GENERIC) {
>> + return 1;
>> + }
>> + }
>> + return 0;
>> +}
>> +
>> +/*
>> + * Any one of the device has iova as va
>> + */
>> +static inline int
>> +pci_device_has_iova_va(void)
>> +{
>> + struct rte_pci_device *dev = NULL;
>> + struct rte_pci_driver *drv = NULL;
>> +
>> + FOREACH_DRIVER_ON_PCIBUS(drv) {
>> + if (drv && drv->drv_flags & RTE_PCI_DRV_NEED_IOVA_VA) {
>> + FOREACH_DEVICE_ON_PCIBUS(dev) {
>> + if (dev->kdrv == RTE_KDRV_VFIO &&
>> + rte_pci_match(drv, dev))
>> + return 1;
>> + }
>> + }
>> + }
>> + return 0;
>> +}
>> +
>> +/*
>> + * Get iommu class of PCI devices on the bus.
>> + */
>> +enum rte_iova_mode
>> +rte_pci_get_iommu_class(void)
>> +{
>> + bool is_vfio_noiommu_enabled;
>> + bool has_iova_va;
>> + bool is_bound_uio;
>> +
>> + has_iova_va = pci_device_has_iova_va();
>> + is_bound_uio = pci_device_bound_uio();
>> + is_vfio_noiommu_enabled = vfio_noiommu_is_enabled() == 1 ? 1 : 0;
>> +
>> + if (has_iova_va && !is_bound_uio && !is_vfio_noiommu_enabled)
>> + return RTE_IOVA_VA;
>> +
>> + if (has_iova_va) {
>> + if (is_vfio_noiommu_enabled)
>> + RTE_LOG(WARNING, EAL, "vfio-noiommu mode configured\n");
>> + if (is_bound_uio)
>> + RTE_LOG(WARNING, EAL, "Some device attached to UIO\n");
>> + }
>> +
>> + return RTE_IOVA_PA;
>> +}
>> +
>> /* Read PCI config space. */
>> int rte_pci_read_config(const struct rte_pci_device *device,
>> void *buf, size_t len, off_t offset)
>> diff --git a/lib/librte_eal/linuxapp/eal/eal_vfio.c b/lib/librte_eal/linuxapp/eal/eal_vfio.c
>> index 946df7e31..c8a97b7e7 100644
>> --- a/lib/librte_eal/linuxapp/eal/eal_vfio.c
>> +++ b/lib/librte_eal/linuxapp/eal/eal_vfio.c
>> @@ -816,4 +816,23 @@ vfio_noiommu_dma_map(int __rte_unused vfio_container_fd)
>> return 0;
>> }
>> +int
>> +vfio_noiommu_is_enabled(void)
>> +{
>> + int fd, ret, cnt __rte_unused;
>> + char c;
>> +
>> + ret = -1;
>> + fd = open(VFIO_NOIOMMU_MODE, O_RDONLY);
>> + if (fd < 0)
>> + return -1;
>> +
>> + cnt = read(fd, &c, 1);
>> + if (c == 'Y')
>> + ret = 1;
>> +
>> + close(fd);
>> + return ret;
>> +}
>> +
>> #endif
>> diff --git a/lib/librte_eal/linuxapp/eal/eal_vfio.h b/lib/librte_eal/linuxapp/eal/eal_vfio.h
>> index 5ff63e5d7..26ea8e119 100644
>> --- a/lib/librte_eal/linuxapp/eal/eal_vfio.h
>> +++ b/lib/librte_eal/linuxapp/eal/eal_vfio.h
>> @@ -150,6 +150,8 @@ struct vfio_config {
>> #define VFIO_NOIOMMU_GROUP_FMT "/dev/vfio/noiommu-%u"
>> #define VFIO_GET_REGION_ADDR(x) ((uint64_t) x << 40ULL)
>> #define VFIO_GET_REGION_IDX(x) (x >> 40)
>> +#define VFIO_NOIOMMU_MODE \
>> + "/sys/module/vfio/parameters/enable_unsafe_noiommu_mode"
>> /* DMA mapping function prototype.
>> * Takes VFIO container fd as a parameter.
>> @@ -210,6 +212,8 @@ int pci_vfio_is_enabled(void);
>> int vfio_mp_sync_setup(void);
>> +int vfio_noiommu_is_enabled(void);
>> +
>> #define SOCKET_REQ_CONTAINER 0x100
>> #define SOCKET_REQ_GROUP 0x200
>> #define SOCKET_CLR_GROUP 0x300
>> diff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
>> index c91dd44c4..044f89c7c 100644
>> --- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
>> +++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
>> @@ -206,6 +206,7 @@ DPDK_17.08 {
>> rte_bus_find_by_device;
>> rte_bus_find_by_name;
>> rte_pci_match;
>> + rte_pci_get_iommu_class;
>> } DPDK_17.05;
>>
>
>