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From: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>
To: Joerg Roedel <joro@8bytes.org>
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
Linuxarm <linuxarm@huawei.com>,
John Garry <john.garry@huawei.com>,
"xuwei (O)" <xuwei5@huawei.com>,
Robin Murphy <robin.murphy@arm.com>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"eric.auger@redhat.com" <eric.auger@redhat.com>,
"pmorel@linux.vnet.ibm.com" <pmorel@linux.vnet.ibm.com>
Subject: RE: [PATCH v6 4/7] iommu/dma: Move PCI window region reservation back into dma specific path.
Date: Tue, 24 Apr 2018 13:16:19 +0000 [thread overview]
Message-ID: <5FC3163CFD30C246ABAA99954A238FA8386928A8@FRAEML521-MBX.china.huawei.com> (raw)
In-Reply-To: <20180418114045.7968-5-shameerali.kolothum.thodi@huawei.com>
Hi Joerg,
Could you please take a look at this patch and let me know.
I have rebased this to 4.17-rc1 and added Robin's R-by.
This series[1] is now pending on this patch as without this it will break few
ARM platforms[2].
Please take a look and let me know.
Thanks,
Shameer
[1] https://lkml.org/lkml/2018/4/18/293
[2] https://lkml.org/lkml/2018/3/14/881
> -----Original Message-----
> From: Shameerali Kolothum Thodi
> Sent: Wednesday, April 18, 2018 12:41 PM
> To: alex.williamson@redhat.com; eric.auger@redhat.com;
> pmorel@linux.vnet.ibm.com
> Cc: kvm@vger.kernel.org; linux-kernel@vger.kernel.org; iommu@lists.linux-
> foundation.org; Linuxarm <linuxarm@huawei.com>; John Garry
> <john.garry@huawei.com>; xuwei (O) <xuwei5@huawei.com>; Shameerali
> Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>; Joerg Roedel
> <joro@8bytes.org>
> Subject: [PATCH v6 4/7] iommu/dma: Move PCI window region reservation
> back into dma specific path.
>
> This pretty much reverts commit 273df9635385 ("iommu/dma: Make PCI
> window reservation generic") by moving the PCI window region
> reservation back into the dma specific path so that these regions
> doesn't get exposed via the IOMMU API interface. With this change,
> the vfio interface will report only iommu specific reserved regions
> to the user space.
>
> Cc: Joerg Roedel <joro@8bytes.org>
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> Reviewed-by: Robin Murphy <robin.murphy@arm.com>
> ---
> drivers/iommu/dma-iommu.c | 54 ++++++++++++++++++++++----------------------
> ---
> 1 file changed, 25 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> index f05f3cf..ddcbbdb 100644
> --- a/drivers/iommu/dma-iommu.c
> +++ b/drivers/iommu/dma-iommu.c
> @@ -167,40 +167,16 @@ EXPORT_SYMBOL(iommu_put_dma_cookie);
> * @list: Reserved region list from iommu_get_resv_regions()
> *
> * IOMMU drivers can use this to implement their .get_resv_regions callback
> - * for general non-IOMMU-specific reservations. Currently, this covers host
> - * bridge windows for PCI devices and GICv3 ITS region reservation on ACPI
> - * based ARM platforms that may require HW MSI reservation.
> + * for general non-IOMMU-specific reservations. Currently, this covers GICv3
> + * ITS region reservation on ACPI based ARM platforms that may require HW
> MSI
> + * reservation.
> */
> void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
> {
> - struct pci_host_bridge *bridge;
> - struct resource_entry *window;
> -
> - if (!is_of_node(dev->iommu_fwspec->iommu_fwnode) &&
> - iort_iommu_msi_get_resv_regions(dev, list) < 0)
> - return;
> -
> - if (!dev_is_pci(dev))
> - return;
> -
> - bridge = pci_find_host_bridge(to_pci_dev(dev)->bus);
> - resource_list_for_each_entry(window, &bridge->windows) {
> - struct iommu_resv_region *region;
> - phys_addr_t start;
> - size_t length;
> -
> - if (resource_type(window->res) != IORESOURCE_MEM)
> - continue;
>
> - start = window->res->start - window->offset;
> - length = window->res->end - window->res->start + 1;
> - region = iommu_alloc_resv_region(start, length, 0,
> - IOMMU_RESV_RESERVED);
> - if (!region)
> - return;
> + if (!is_of_node(dev->iommu_fwspec->iommu_fwnode))
> + iort_iommu_msi_get_resv_regions(dev, list);
>
> - list_add_tail(®ion->list, list);
> - }
> }
> EXPORT_SYMBOL(iommu_dma_get_resv_regions);
>
> @@ -229,6 +205,23 @@ static int cookie_init_hw_msi_region(struct
> iommu_dma_cookie *cookie,
> return 0;
> }
>
> +static void iova_reserve_pci_windows(struct pci_dev *dev,
> + struct iova_domain *iovad)
> +{
> + struct pci_host_bridge *bridge = pci_find_host_bridge(dev->bus);
> + struct resource_entry *window;
> + unsigned long lo, hi;
> +
> + resource_list_for_each_entry(window, &bridge->windows) {
> + if (resource_type(window->res) != IORESOURCE_MEM)
> + continue;
> +
> + lo = iova_pfn(iovad, window->res->start - window->offset);
> + hi = iova_pfn(iovad, window->res->end - window->offset);
> + reserve_iova(iovad, lo, hi);
> + }
> +}
> +
> static int iova_reserve_iommu_regions(struct device *dev,
> struct iommu_domain *domain)
> {
> @@ -238,6 +231,9 @@ static int iova_reserve_iommu_regions(struct device
> *dev,
> LIST_HEAD(resv_regions);
> int ret = 0;
>
> + if (dev_is_pci(dev))
> + iova_reserve_pci_windows(to_pci_dev(dev), iovad);
> +
> iommu_get_resv_regions(dev, &resv_regions);
> list_for_each_entry(region, &resv_regions, list) {
> unsigned long lo, hi;
> --
> 2.7.4
>
next prev parent reply other threads:[~2018-04-24 13:16 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-18 11:40 [PATCH v6 0/7] vfio/type1: Add support for valid iova list management Shameer Kolothum
2018-04-18 11:40 ` [PATCH v6 1/7] vfio/type1: Introduce iova list and add iommu aperture validity check Shameer Kolothum
2018-04-18 11:40 ` [PATCH v6 2/7] vfio/type1: Check reserve region conflict and update iova list Shameer Kolothum
2018-04-18 11:40 ` [PATCH v6 3/7] vfio/type1: Update iova list on detach Shameer Kolothum
2018-04-18 11:40 ` [PATCH v6 4/7] iommu/dma: Move PCI window region reservation back into dma specific path Shameer Kolothum
2018-04-24 13:16 ` Shameerali Kolothum Thodi [this message]
2018-04-30 16:10 ` Alex Williamson
2018-05-03 13:16 ` Joerg Roedel
2018-04-18 11:40 ` [PATCH v6 5/7] vfio/type1: check dma map request is within a valid iova range Shameer Kolothum
2018-04-18 11:40 ` [PATCH v6 6/7] vfio/type1: Add IOVA range capability support Shameer Kolothum
2018-04-18 11:40 ` [PATCH v6 7/7] vfio/type1: remove duplicate retrieval of reserved regions Shameer Kolothum
2018-05-24 18:20 ` [PATCH v6 0/7] vfio/type1: Add support for valid iova list management Alex Williamson
2018-05-25 8:45 ` Shameerali Kolothum Thodi
2018-05-25 20:54 ` Alex Williamson
2018-06-05 17:03 ` Alex Williamson
2018-06-06 6:52 ` Shameerali Kolothum Thodi
2018-06-07 15:05 ` Alex Williamson
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