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PCI/ACPI: Add generic MCFG table handling

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On ACPI systems that support memory-mapped config space access, i.e., ECAM,
the PCI Firmware Specification says the OS can learn where the ECAM space
is from either:

  - the static MCFG table (for non-hotpluggable bridges), or
  - the _CBA method (for hotpluggable bridges)

The current MCFG table handling code cannot be easily generalized owing to
x86-specific quirks, which makes it hard to reuse on other architectures.

Implement generic MCFG handling from scratch, including:

  - Simple MCFG table parsing (via pci_mmcfg_late_init() as in current x86)
  - MCFG region lookup for a (domain, bus_start, bus_end) tuple

[bhelgaas: changelog]
Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Tomasz Nowicki
2016-06-10 21:55:13 +02:00
committed by Bjorn Helgaas
parent 0a70abb380
commit 935c760ec8
5 changed files with 99 additions and 1 deletions
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2
include/linux/pci.h
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@@ -1723,7 +1723,7 @@ void pcibios_free_irq(struct pci_dev *dev);
extern struct dev_pm_ops pcibios_pm_ops;
#endif
#ifdef CONFIG_PCI_MMCONFIG
#if defined(CONFIG_PCI_MMCONFIG) || defined(CONFIG_ACPI_MCFG)
void __init pci_mmcfg_early_init(void);
void __init pci_mmcfg_late_init(void);
#else