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| author | Marc Zyngier <maz@kernel.org> | 2021-09-29 17:38:41 +0100 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2021-11-04 16:29:30 -0500 |
| commit | 946d619fa25f55483206befb035fed6a99fbe7b5 (patch) | |
| tree | 808c519bd2557ea4061f34426800d59d94d8875d /drivers/pci/controller/pcie-apple.c | |
| parent | 476c41ed4597512f9da334be8ddf2fb2262d3057 (diff) | |
| download | linux-946d619fa25f55483206befb035fed6a99fbe7b5.tar.gz linux-946d619fa25f55483206befb035fed6a99fbe7b5.tar.bz2 linux-946d619fa25f55483206befb035fed6a99fbe7b5.zip | |
iommu/dart: Exclude MSI doorbell from PCIe device IOVA range
The MSI doorbell on Apple HW can be any address in the low 4GB range.
However, the MSI write is matched by the PCIe block before hitting the
iommu. It must thus be excluded from the IOVA range that is assigned to any
PCIe device.
Link: https://lore.kernel.org/r/20210929163847.2807812-9-maz@kernel.org
Tested-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sven Peter <sven@svenpeter.dev>
Diffstat (limited to 'drivers/pci/controller/pcie-apple.c')
| -rw-r--r-- | drivers/pci/controller/pcie-apple.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c index 8f413509e37d..3646638f3df0 100644 --- a/drivers/pci/controller/pcie-apple.c +++ b/drivers/pci/controller/pcie-apple.c @@ -120,8 +120,10 @@ * The doorbell address is set to 0xfffff000, which by convention * matches what MacOS does, and it is possible to use any other * address (in the bottom 4GB, as the base register is only 32bit). + * However, it has to be excluded from the IOVA range, and the DART + * driver has to know about it. */ -#define DOORBELL_ADDR 0xfffff000 +#define DOORBELL_ADDR CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR struct apple_pcie { struct mutex lock; |