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author | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2017-08-03 13:32:39 +0100 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-08-07 14:29:09 +0200 |
commit | 10d8ab2c15b9ef2f46c35e7c36781399d6f2cc82 (patch) | |
tree | 7ce2b9a645674e219197272f63522ffa7b999306 /drivers/acpi/arm64 | |
parent | 7ad4263980826e8b02e121af22f4f4c9103fe86d (diff) | |
download | linux-10d8ab2c15b9ef2f46c35e7c36781399d6f2cc82.tar.gz linux-10d8ab2c15b9ef2f46c35e7c36781399d6f2cc82.tar.bz2 linux-10d8ab2c15b9ef2f46c35e7c36781399d6f2cc82.zip |
ACPI/IORT: Add IORT named component memory address limits
IORT named components provide firmware configuration describing
how many address bits a given device is capable of generating
to address memory.
Add code to the kernel to retrieve memory address limits
configuration for IORT named components and configure DMA masks
accordingly.
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 'drivers/acpi/arm64')
-rw-r--r-- | drivers/acpi/arm64/iort.c | 54 |
1 files changed, 37 insertions, 17 deletions
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 606af87c425f..5b9e8dc29c09 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -680,6 +680,24 @@ static const struct iommu_ops *iort_iommu_xlate(struct device *dev, return ret ? NULL : ops; } +static int nc_dma_get_range(struct device *dev, u64 *size) +{ + struct acpi_iort_node *node; + struct acpi_iort_named_component *ncomp; + + node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT, + iort_match_node_callback, dev); + if (!node) + return -ENODEV; + + ncomp = (struct acpi_iort_named_component *)node->node_data; + + *size = ncomp->memory_address_limit >= 64 ? U64_MAX : + 1ULL<<ncomp->memory_address_limit; + + return 0; +} + /** * iort_dma_setup() - Set-up device DMA parameters. * @@ -708,24 +726,26 @@ void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1); - if (dev_is_pci(dev)) { + if (dev_is_pci(dev)) ret = acpi_dma_get_range(dev, &dmaaddr, &offset, &size); - if (!ret) { - msb = fls64(dmaaddr + size - 1); - /* - * Round-up to the power-of-two mask or set - * the mask to the whole 64-bit address space - * in case the DMA region covers the full - * memory window. - */ - mask = msb == 64 ? U64_MAX : (1ULL << msb) - 1; - /* - * Limit coherent and dma mask based on size - * retrieved from firmware. - */ - dev->coherent_dma_mask = mask; - *dev->dma_mask = mask; - } + else + ret = nc_dma_get_range(dev, &size); + + if (!ret) { + msb = fls64(dmaaddr + size - 1); + /* + * Round-up to the power-of-two mask or set + * the mask to the whole 64-bit address space + * in case the DMA region covers the full + * memory window. + */ + mask = msb == 64 ? U64_MAX : (1ULL << msb) - 1; + /* + * Limit coherent and dma mask based on size + * retrieved from firmware. + */ + dev->coherent_dma_mask = mask; + *dev->dma_mask = mask; } *dma_addr = dmaaddr; |