diff options
| author | Shay Agroskin <shayagr@amazon.com> | 2020-11-23 21:08:58 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-02 08:49:52 +0100 |
| commit | a447dbb44d443e0cd2da075df14a11dcca848d11 (patch) | |
| tree | 9a6cf2338f84734000dd3504bfca44053a5d23cb /drivers/net/ethernet/amazon | |
| parent | 7869696d6c1e72c6b42cebb21be897e381d26148 (diff) | |
net: ena: set initial DMA width to avoid intel iommu issue
[ Upstream commit 09323b3bca95181c0da79daebc8b0603e500f573 ]
The ENA driver uses the readless mechanism, which uses DMA, to find
out what the DMA mask is supposed to be.
If DMA is used without setting the dma_mask first, it causes the
Intel IOMMU driver to think that ENA is a 32-bit device and therefore
disables IOMMU passthrough permanently.
This patch sets the dma_mask to be ENA_MAX_PHYS_ADDR_SIZE_BITS=48
before readless initialization in
ena_device_init()->ena_com_mmio_reg_read_request_init(),
which is large enough to workaround the intel_iommu issue.
DMA mask is set again to the correct value after it's received from the
device after readless is initialized.
The patch also changes the driver to use dma_set_mask_and_coherent()
function instead of the two pci_set_dma_mask() and
pci_set_consistent_dma_mask() ones. Both methods achieve the same
effect.
Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Mike Cui <mikecui@amazon.com>
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/net/ethernet/amazon')
| -rw-r--r-- | drivers/net/ethernet/amazon/ena/ena_netdev.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c index 635345bced31..2e5348ec2a2e 100644 --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c @@ -2622,16 +2622,9 @@ static int ena_device_init(struct ena_com_dev *ena_dev, struct pci_dev *pdev, goto err_mmio_read_less; } - rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(dma_width)); + rc = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(dma_width)); if (rc) { - dev_err(dev, "pci_set_dma_mask failed 0x%x\n", rc); - goto err_mmio_read_less; - } - - rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(dma_width)); - if (rc) { - dev_err(dev, "err_pci_set_consistent_dma_mask failed 0x%x\n", - rc); + dev_err(dev, "dma_set_mask_and_coherent failed %d\n", rc); goto err_mmio_read_less; } @@ -3450,6 +3443,12 @@ static int ena_probe(struct pci_dev *pdev, const struct pci_device_id *ent) return rc; } + rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(ENA_MAX_PHYS_ADDR_SIZE_BITS)); + if (rc) { + dev_err(&pdev->dev, "dma_set_mask_and_coherent failed %d\n", rc); + goto err_disable_device; + } + pci_set_master(pdev); ena_dev = vzalloc(sizeof(*ena_dev)); |