Commit 9fe5c59f authored Oct 31, 2018 by Keith Busch Committed by Jens Axboe Nov 02, 2018

nvme-pci: fix conflicting p2p resource adds



The nvme pci driver had been adding its CMB resource to the P2P DMA
subsystem everytime on on a controller reset. This results in the
following warning:

    ------------[ cut here ]------------
    nvme 0000:00:03.0: Conflicting mapping in same section
    WARNING: CPU: 7 PID: 81 at kernel/memremap.c:155 devm_memremap_pages+0xa6/0x380
    ...
    Call Trace:
     pci_p2pdma_add_resource+0x153/0x370
     nvme_reset_work+0x28c/0x17b1 [nvme]
     ? add_timer+0x107/0x1e0
     ? dequeue_entity+0x81/0x660
     ? dequeue_entity+0x3b0/0x660
     ? pick_next_task_fair+0xaf/0x610
     ? __switch_to+0xbc/0x410
     process_one_work+0x1cf/0x350
     worker_thread+0x215/0x3d0
     ? process_one_work+0x350/0x350
     kthread+0x107/0x120
     ? kthread_park+0x80/0x80
     ret_from_fork+0x1f/0x30
    ---[ end trace f7ea76ac6ee72727 ]---
    nvme nvme0: failed to register the CMB

This patch fixes this by registering the CMB with P2P only once.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent d19b8bc8

drivers/nvme/host/pci.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -1663,6 +1663,9 @@ static void nvme_map_cmb(struct nvme_dev *dev)
		struct pci_dev *pdev = to_pci_dev(dev->dev);
		int bar;

		if (dev->cmb_size)
		return;

		dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ);
		if (!dev->cmbsz)
		return;
		@@ -2147,7 +2150,6 @@ static void nvme_pci_disable(struct nvme_dev *dev)
		{
		struct pci_dev *pdev = to_pci_dev(dev->dev);

		nvme_release_cmb(dev);
		pci_free_irq_vectors(pdev);

		if (pci_is_enabled(pdev)) {
		@@ -2595,6 +2597,7 @@ static void nvme_remove(struct pci_dev *pdev)
		nvme_stop_ctrl(&dev->ctrl);
		nvme_remove_namespaces(&dev->ctrl);
		nvme_dev_disable(dev, true);
		nvme_release_cmb(dev);
		nvme_free_host_mem(dev);
		nvme_dev_remove_admin(dev);
		nvme_free_queues(dev, 0);

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