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ARM64: Implement pci_remap_cfgspace() interface

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The PCI bus specification (rev 3.0, 3.2.5 "Transaction Ordering and
Posting") defines rules for PCI configuration space transactions ordering
and posting, that state that configuration writes are non-posted
transactions.

This rule is reinforced by the ARM v8 architecture reference manual (issue
A.k, Early Write Acknowledgment) that explicitly recommends that No Early
Write Acknowledgment attribute should be used to map PCI configuration
(write) transactions.

Current ioremap interface on ARM64 implements mapping functions where the
Early Write Acknowledgment hint is enabled, so they cannot be used to map
PCI configuration space in a PCI specs compliant way.

Implement an ARM64 specific pci_remap_cfgspace() interface that allows to
map PCI config region with nGnRnE attributes, providing a remap function
that complies with PCI specifications and the ARMv8 architecture reference
manual recommendations.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Lorenzo Pieralisi 2017-04-19 17:48:52 +01:00 committed by Bjorn Helgaas
parent cf9ea8ca4a
commit f1e209b7f8
1 changed files with 10 additions and 0 deletions
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10
arch/arm64/include/asm/io.h
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@ -172,6 +172,16 @@ extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size);
#define ioremap_wt(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))
#define iounmap __iounmap
/*
* PCI configuration space mapping function.
*
* The PCI specification disallows posted write configuration transactions.
* Add an arch specific pci_remap_cfgspace() definition that is implemented
* through nGnRnE device memory attribute as recommended by the ARM v8
* Architecture reference manual Issue A.k B2.8.2 "Device memory".
*/
#define pci_remap_cfgspace(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRnE))
/*
* io{read,write}{16,32,64}be() macros
*/