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| author |   Christoph Hellwig <hch@lst.de> | 2019-07-03 09:54:44 -0700 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-07-09 13:44:44 -0700 |
| commit | 7637de311bd2124b298a072852448b940d8a34b9 (patch) | |
| tree | af68ae72def48f858e4f961b382c8bd6b3021c48 /drivers/nvme | |
| parent | nvme-pci: check for NULL return from pci_alloc_p2pmem() (diff) | |
| download | linux-dev-7637de311bd2124b298a072852448b940d8a34b9.tar.xz linux-dev-7637de311bd2124b298a072852448b940d8a34b9.zip | |
nvme-pci: limit max_hw_sectors based on the DMA max mapping size
When running a NVMe device that is attached to a addressing
challenged PCIe root port that requires bounce buffering, our
request sizes can easily overflow the swiotlb bounce buffer
size. Limit the maximum I/O size to the limit exposed by
the DMA mapping subsystem.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Atish Patra <Atish.Patra@wdc.com>
Tested-by: Atish Patra <Atish.Patra@wdc.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/pci.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index ac2011b8dac1..bb970ca82517 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -2503,7 +2503,8 @@ static void nvme_reset_work(struct work_struct *work) * Limit the max command size to prevent iod->sg allocations going * over a single page. */ - dev->ctrl.max_hw_sectors = NVME_MAX_KB_SZ << 1; + dev->ctrl.max_hw_sectors = min_t(u32, + NVME_MAX_KB_SZ << 1, dma_max_mapping_size(dev->dev) >> 9); dev->ctrl.max_segments = NVME_MAX_SEGS; /* |