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| author | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2017-08-07 11:29:49 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-08-07 14:28:51 +0200 |
| commit | 7ad4263980826e8b02e121af22f4f4c9103fe86d (patch) | |
| tree | 436c849f4eb9c25377579743121d8b956ae2e57d /include/linux | |
| parent | c04ac679c6b86e4e36fbb675c6c061b4091f5810 (diff) | |
| download | linux-stable-7ad4263980826e8b02e121af22f4f4c9103fe86d.tar.gz linux-stable-7ad4263980826e8b02e121af22f4f4c9103fe86d.tar.bz2 linux-stable-7ad4263980826e8b02e121af22f4f4c9103fe86d.zip | |
ACPI: Make acpi_dma_configure() DMA regions aware
Current ACPI DMA configuration set-up device DMA capabilities through
kernel defaults that do not take into account platform specific DMA
configurations reported by firmware.
By leveraging the ACPI acpi_dev_get_dma_resources() API, add code
in acpi_dma_configure() to retrieve the DMA regions to correctly
set-up PCI devices DMA parameters.
Rework the ACPI IORT kernel API to make sure they can accommodate
the DMA set-up required by firmware. By making PCI devices DMA set-up
ACPI IORT specific, the kernel is shielded from unwanted regressions
that could be triggered by parsing DMA resources on arches that were
previously ignoring them (ie x86/ia64), leaving kernel behaviour
unchanged on those arches.
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Tested-by: Nate Watterson <nwatters@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/acpi_iort.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h index 8379d406ad2e..8d3f0bf80379 100644 --- a/include/linux/acpi_iort.h +++ b/include/linux/acpi_iort.h @@ -36,7 +36,7 @@ struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id); void acpi_configure_pmsi_domain(struct device *dev); int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id); /* IOMMU interface */ -void iort_set_dma_mask(struct device *dev); +void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *size); const struct iommu_ops *iort_iommu_configure(struct device *dev); #else static inline void acpi_iort_init(void) { } @@ -47,7 +47,8 @@ static inline struct irq_domain *iort_get_device_domain(struct device *dev, { return NULL; } static inline void acpi_configure_pmsi_domain(struct device *dev) { } /* IOMMU interface */ -static inline void iort_set_dma_mask(struct device *dev) { } +static inline void iort_dma_setup(struct device *dev, u64 *dma_addr, + u64 *size) { } static inline const struct iommu_ops *iort_iommu_configure(struct device *dev) { return NULL; } |