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Commit 7b210e4e authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
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nvme: disable Write Zeroes for qemu controllers 



Qemu started out with a broken implementation of Write Zeroes written
by yours truly.  Disable Write Zeroes on qemu for now, eventually
we need to go back and make all the qemu quirks version specific,
but that is left for another time.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarKeith Busch <keith.busch@intel.com>
Tested-by: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 404ec31d

drivers/nvme/host/core.c

+2 −1
Original line number Diff line number Diff line
@@ -1531,7 +1531,8 @@ static inline void nvme_config_write_zeroes(struct nvme_ns *ns) 
	u32 max_sectors;

	unsigned short bs = 1 << ns->lba_shift;



	if (!(ns->ctrl->oncs & NVME_CTRL_ONCS_WRITE_ZEROES))

	if (!(ns->ctrl->oncs & NVME_CTRL_ONCS_WRITE_ZEROES) ||

	    (ns->ctrl->quirks & NVME_QUIRK_DISABLE_WRITE_ZEROES))

		return;

	/*

	 * Even though NVMe spec explicitly states that MDTS is not

drivers/nvme/host/nvme.h

+5 −0
Original line number Diff line number Diff line
@@ -87,6 +87,11 @@ enum nvme_quirks { 
	 * Ignore device provided subnqn.

	 */

	NVME_QUIRK_IGNORE_DEV_SUBNQN		= (1 << 8),



	/*

	 * Broken Write Zeroes.

	 */

	NVME_QUIRK_DISABLE_WRITE_ZEROES		= (1 << 9),

};



/*

drivers/nvme/host/pci.c

+2 −1
Original line number Diff line number Diff line
@@ -2975,7 +2975,8 @@ static const struct pci_device_id nvme_id_table[] = { 
	{ PCI_VDEVICE(INTEL, 0xf1a6),	/* Intel 760p/Pro 7600p */

		.driver_data = NVME_QUIRK_IGNORE_DEV_SUBNQN, },

	{ PCI_VDEVICE(INTEL, 0x5845),	/* Qemu emulated controller */

		.driver_data = NVME_QUIRK_IDENTIFY_CNS, },

		.driver_data = NVME_QUIRK_IDENTIFY_CNS |

				NVME_QUIRK_DISABLE_WRITE_ZEROES, },

	{ PCI_DEVICE(0x1bb1, 0x0100),   /* Seagate Nytro Flash Storage */

		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },

	{ PCI_DEVICE(0x1c58, 0x0003),	/* HGST adapter */