nvme-pci: skip CMB blocks incompatible with PCI P2P DMA

The PCI P2PDMA code will register the CMB block to the memory
hot-plugging subsystem, which have an alignment requirement. Memory
blocks that do not satisfy this alignment requirement (usually 2MB) will
lead to a WARNING from memory hotplugging.

Verify the CMB block's address and size against the alignment and only
try to send CMB blocks compatible with it to prevent this warning.

Tested on Intel DC D4502 SSD, which has a 512K CMB block that is too
small for memory hotplugging (thus PCI P2PDMA).

Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
Signed-off-by: Keith Busch <kbusch@kernel.org>

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 218506e3dabea4cbf3c9176eac0fd2758648e557..640590b2172828cf70c05bd35234b44f286d0d16 100644 (file)
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1982,6 +1982,18 @@ static void nvme_map_cmb(struct nvme_dev *dev)
        if (offset > bar_size)
                return;
 
+       /*
+        * Controllers may support a CMB size larger than their BAR, for
+        * example, due to being behind a bridge. Reduce the CMB to the
+        * reported size of the BAR
+        */
+       size = min(size, bar_size - offset);
+
+       if (!IS_ALIGNED(size, memremap_compat_align()) ||
+           !IS_ALIGNED(pci_resource_start(pdev, bar),
+                       memremap_compat_align()))
+               return;
+
        /*
         * Tell the controller about the host side address mapping the CMB,
         * and enable CMB decoding for the NVMe 1.4+ scheme:
@@ -1992,14 +2004,6 @@ static void nvme_map_cmb(struct nvme_dev *dev)
                             dev->bar + NVME_REG_CMBMSC);
        }
 
-       /*
-        * Controllers may support a CMB size larger than their BAR,
-        * for example, due to being behind a bridge. Reduce the CMB to
-        * the reported size of the BAR
-        */
-       if (size > bar_size - offset)
-               size = bar_size - offset;
-
        if (pci_p2pdma_add_resource(pdev, bar, size, offset)) {
                dev_warn(dev->ctrl.device,
                         "failed to register the CMB\n");