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nvme-pci: Remap CMB SQ entries on every controller reset 

The controller memory buffer is remapped into a kernel address on each
reset, but the driver was setting the submission queue base address
only on the very first queue creation. The remapped address is likely to
change after a reset, so accessing the old address will hit a kernel bug.

This patch fixes that by setting the queue's CMB base address each time
the queue is created.

Fixes: f63572dff1 ("nvme: unmap CMB and remove sysfs file in reset path")
Reported-by: Christian Black <christian.d.black@intel.com>
Cc: Jon Derrick <jonathan.derrick@intel.com>
Cc: <stable@vger.kernel.org> # 4.9+
Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
hifive-unleashed-5.1
Keith Busch 2018-02-13 05:44:44 -07:00
parent 3fd176b754
commit 815c6704bf
1 changed files with 14 additions and 11 deletions
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25
drivers/nvme/host/pci.c
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@ -1364,18 +1364,14 @@ static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues,
static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq,
int qid, int depth)
{
if (qid && dev->cmb && use_cmb_sqes && (dev->cmbsz & NVME_CMBSZ_SQS)) {
unsigned offset = (qid - 1) * roundup(SQ_SIZE(depth),
dev->ctrl.page_size);
nvmeq->sq_dma_addr = dev->cmb_bus_addr + offset;
nvmeq->sq_cmds_io = dev->cmb + offset;
} else {
nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth),
&nvmeq->sq_dma_addr, GFP_KERNEL);
if (!nvmeq->sq_cmds)
return -ENOMEM;
}
/* CMB SQEs will be mapped before creation */
if (qid && dev->cmb && use_cmb_sqes && (dev->cmbsz & NVME_CMBSZ_SQS))
return 0;
nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth),
&nvmeq->sq_dma_addr, GFP_KERNEL);
if (!nvmeq->sq_cmds)
return -ENOMEM;
return 0;
}
@ -1449,6 +1445,13 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid)
struct nvme_dev *dev = nvmeq->dev;
int result;
if (dev->cmb && use_cmb_sqes && (dev->cmbsz & NVME_CMBSZ_SQS)) {
unsigned offset = (qid - 1) * roundup(SQ_SIZE(nvmeq->q_depth),
dev->ctrl.page_size);
nvmeq->sq_dma_addr = dev->cmb_bus_addr + offset;
nvmeq->sq_cmds_io = dev->cmb + offset;
}
nvmeq->cq_vector = qid - 1;
result = adapter_alloc_cq(dev, qid, nvmeq);
if (result < 0)