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sfc: Stop using iommu_present()

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Even if an IOMMU might be present for some PCI segment in the system,
that doesn't necessarily mean it provides translation for the device
we care about. It appears that what we care about here is specifically
whether DMA mapping ops involve any IOMMU overhead or not, so check for
translation actually being active for our device.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Edward Cree <ecree.xilinx@gmail.com>
Link: https://lore.kernel.org/r/7350f957944ecfce6cce90f422e3992a1f428775.1649166055.git.robin.murphy@arm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Robin Murphy 2022-04-05 14:40:55 +01:00 committed by Jakub Kicinski
parent e9f656b7a2
commit 6a62924c0a
1 changed files with 3 additions and 1 deletions
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4
drivers/net/ethernet/sfc/falcon/rx.c
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@ -718,12 +718,14 @@ static void ef4_init_rx_recycle_ring(struct ef4_nic *efx,
struct ef4_rx_queue *rx_queue)
{
unsigned int bufs_in_recycle_ring, page_ring_size;
struct iommu_domain __maybe_unused *domain;
/* Set the RX recycle ring size */
#ifdef CONFIG_PPC64
bufs_in_recycle_ring = EF4_RECYCLE_RING_SIZE_IOMMU;
#else
if (iommu_present(&pci_bus_type))
domain = iommu_get_domain_for_dev(&efx->pci_dev->dev);
if (domain && domain->type != IOMMU_DOMAIN_IDENTITY)
bufs_in_recycle_ring = EF4_RECYCLE_RING_SIZE_IOMMU;
else
bufs_in_recycle_ring = EF4_RECYCLE_RING_SIZE_NOIOMMU;