nvme-pci: remap BAR0 to cover admin CQ doorbell for large stride

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The existing driver initially maps 8192 bytes of BAR0 which is
intended to cover doorbells of admin SQ and CQ. However, if a
large stride, e.g. 10, is used, the doorbell of admin CQ will
be out of 8192 bytes. Consequently, a page fault will be raised
when the admin CQ doorbell is accessed in nvme_configure_admin_queue().

This patch fixes this issue by remapping BAR0 before accessing
admin CQ doorbell if the initial mapping is not enough.

Signed-off-by: Xu Yu <yu.a.xu@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

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Xu Yu 2017-05-24 16:39:55 +08:00 • committed by Christoph Hellwig

parent fdf9dfa850

commit 97f6ef6464

2 changed files with 44 additions and 22 deletions

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65

drivers/nvme/host/pci.c

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1

include/linux/nvme.h

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