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| author | Stephan Günther <guenther@tum.de> | 2015-12-01 13:23:22 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-12-01 13:23:22 -0700 |
| commit | 1f390c1fde3a96974784be53cb3a645da3e4849c (patch) | |
| tree | d84e25cbfbdab69b8b12da857557a20a232b8e6d /drivers/nvme | |
| parent | dbac117542b7e814245c43daa638a3626230cb2a (diff) | |
| download | linux-1f390c1fde3a96974784be53cb3a645da3e4849c.tar.gz linux-1f390c1fde3a96974784be53cb3a645da3e4849c.tar.bz2 linux-1f390c1fde3a96974784be53cb3a645da3e4849c.zip | |
nvme: temporary fix for Apple controller reset
Recent patches added basic support for the Apple NVMe controller but
still cause resets and data corruption on that particular controller
when a specific pattern of read/flush commands occurs. Limiting the
queue depth to 2 works around that issue.
This patch enforces that limit only for the Apple controller and is
considered a temporary fix until we find the root source of that
problem.
Signed-off-by: Stephan Günther <guenther@tum.de>
Signed-off-by: Maurice Leclaire <leclaire@in.tum.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/pci.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index f3b53af789ef..9e294ff4e652 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -2708,6 +2708,18 @@ static int nvme_dev_map(struct nvme_dev *dev) dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH); dev->db_stride = 1 << NVME_CAP_STRIDE(cap); dev->dbs = ((void __iomem *)dev->bar) + 4096; + + /* + * Temporary fix for the Apple controller found in the MacBook8,1 and + * some MacBook7,1 to avoid controller resets and data loss. + */ + if (pdev->vendor == PCI_VENDOR_ID_APPLE && pdev->device == 0x2001) { + dev->q_depth = 2; + dev_warn(dev->dev, "detected Apple NVMe controller, set " + "queue depth=%u to work around controller resets\n", + dev->q_depth); + } + if (readl(&dev->bar->vs) >= NVME_VS(1, 2)) dev->cmb = nvme_map_cmb(dev); |