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Subject[PATCH 3/3] nvme: Add support for Apple 2018+ models
Date
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>
---
drivers/nvme/host/core.c | 5 ++++-
drivers/nvme/host/nvme.h | 10 ++++++++++
drivers/nvme/host/pci.c | 6 ++++++
3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 716ebe87a2b8..480ea24d8cf4 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2701,7 +2701,10 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
ctrl->hmmaxd = le16_to_cpu(id->hmmaxd);

/* Grab required IO queue size */
- ctrl->iosqes = id->sqes & 0xf;
+ if (ctrl->quirks & NVME_QUIRK_128_BYTES_SQES)
+ ctrl->iosqes = 7;
+ else
+ ctrl->iosqes = id->sqes & 0xf;
if (ctrl->iosqes < NVME_NVM_IOSQES) {
dev_err(ctrl->device,
"unsupported required IO queue size %d\n", ctrl->iosqes);
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 34ef35fcd8a5..b2a78d08b984 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -92,6 +92,16 @@ 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),
};

/*
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 54b35ea4af88..ab2358137419 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2080,6 +2080,9 @@ 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;

+ 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);
}
@@ -3037,6 +3040,9 @@ 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);
--
2.17.1
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