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nvme-pci: Add support for Apple 2018+ models 

Based on reverse engineering and original patch by

Paul Pawlowski <paul@mrarm.io>

This adds support for Apple weird implementation of NVME in their
2018 or later machines. It accounts for the twice-as-big SQ entries
for the IO queues, and the fact that only interrupt vector 0 appears
to function properly.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Minwoo Im <minwoo.im.dev@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Benjamin Herrenschmidt 2019-08-07 17:51:21 +10:00 committed by Sagi Grimberg
parent c1e0cc7e1d
commit 66341331ba
2 changed files with 30 additions and 1 deletions
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10
drivers/nvme/host/nvme.h
View File

@ -94,6 +94,16 @@ enum nvme_quirks {
* Broken Write Zeroes.
*/
NVME_QUIRK_DISABLE_WRITE_ZEROES = (1 << 9),
/*
* Use only one interrupt vector for all queues
*/
NVME_QUIRK_SINGLE_VECTOR = (1 << 10),
/*
* Use non-standard 128 bytes SQEs.
*/
NVME_QUIRK_128_BYTES_SQES = (1 << 11),
};
/*

21
drivers/nvme/host/pci.c
View File

@ -2081,6 +2081,13 @@ static int nvme_setup_irqs(struct nvme_dev *dev, unsigned int nr_io_queues)
dev->io_queues[HCTX_TYPE_DEFAULT] = 1;
dev->io_queues[HCTX_TYPE_READ] = 0;
/*
* Some Apple controllers require all queues to use the
* first vector.
*/
if (dev->ctrl.quirks & NVME_QUIRK_SINGLE_VECTOR)
irq_queues = 1;
return pci_alloc_irq_vectors_affinity(pdev, 1, irq_queues,
PCI_IRQ_ALL_TYPES | PCI_IRQ_AFFINITY, &affd);
}
@ -2321,7 +2328,16 @@ static int nvme_pci_enable(struct nvme_dev *dev)
dev->ctrl.sqsize = dev->q_depth - 1; /* 0's based queue depth */
dev->db_stride = 1 << NVME_CAP_STRIDE(dev->ctrl.cap);
dev->dbs = dev->bar + 4096;
dev->io_sqes = NVME_NVM_IOSQES;
/*
* Some Apple controllers require a non-standard SQE size.
* Interestingly they also seem to ignore the CC:IOSQES register
* so we don't bother updating it here.
*/
if (dev->ctrl.quirks & NVME_QUIRK_128_BYTES_SQES)
dev->io_sqes = 7;
else
dev->io_sqes = NVME_NVM_IOSQES;
/*
* Temporary fix for the Apple controller found in the MacBook8,1 and
@ -3040,6 +3056,9 @@ static const struct pci_device_id nvme_id_table[] = {
{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) },
{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2003) },
{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2005),
.driver_data = NVME_QUIRK_SINGLE_VECTOR |
NVME_QUIRK_128_BYTES_SQES },
{ 0, }
};
MODULE_DEVICE_TABLE(pci, nvme_id_table);