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Commit 106198ed authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

nvme: add explicit quirk handling 



Add an enum for all workarounds not in the spec and identify the affected
controllers at probe time.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 1673f1f0

drivers/nvme/host/nvme.h

+13 −0
Original line number Diff line number Diff line
@@ -32,6 +32,18 @@ enum { 
	NVME_NS_LIGHTNVM	= 1,

};



/*

 * List of workarounds for devices that required behavior not specified in

 * the standard.

 */

enum nvme_quirks {

	/*

	 * Prefers I/O aligned to a stripe size specified in a vendor

	 * specific Identify field.

	 */

	NVME_QUIRK_STRIPE_SIZE			= (1 << 0),

};



struct nvme_ctrl {

	const struct nvme_ctrl_ops *ops;

	struct request_queue *admin_q;
@@ -47,6 +59,7 @@ struct nvme_ctrl { 
	u16 abort_limit;

	u8 event_limit;

	u8 vwc;

	unsigned long quirks;

};



/*

drivers/nvme/host/pci.c

+5 −3
Original line number Diff line number Diff line
@@ -2026,7 +2026,6 @@ static void nvme_dev_scan(struct work_struct *work) 
 */

static int nvme_dev_add(struct nvme_dev *dev)

{

	struct pci_dev *pdev = to_pci_dev(dev->dev);

	int res;

	struct nvme_id_ctrl *ctrl;

	int shift = NVME_CAP_MPSMIN(lo_hi_readq(dev->bar + NVME_REG_CAP)) + 12;
@@ -2047,8 +2046,8 @@ static int nvme_dev_add(struct nvme_dev *dev) 
		dev->max_hw_sectors = 1 << (ctrl->mdts + shift - 9);

	else

		dev->max_hw_sectors = UINT_MAX;

	if ((pdev->vendor == PCI_VENDOR_ID_INTEL) &&

			(pdev->device == 0x0953) && ctrl->vs[3]) {



	if ((dev->ctrl.quirks & NVME_QUIRK_STRIPE_SIZE) && ctrl->vs[3]) {

		unsigned int max_hw_sectors;



		dev->stripe_size = 1 << (ctrl->vs[3] + shift);
@@ -2719,6 +2718,7 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) 


	dev->ctrl.ops = &nvme_pci_ctrl_ops;

	dev->ctrl.dev = dev->dev;

	dev->ctrl.quirks = id->driver_data;



	result = nvme_set_instance(dev);

	if (result)
@@ -2846,6 +2846,8 @@ static const struct pci_error_handlers nvme_err_handler = { 
#define PCI_CLASS_STORAGE_EXPRESS	0x010802



static const struct pci_device_id nvme_id_table[] = {

	{ PCI_VDEVICE(INTEL, 0x0953),

		.driver_data = NVME_QUIRK_STRIPE_SIZE, },

	{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },

	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) },

	{ 0, }