Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/acpi.h>
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#include <linux/acpi_iort.h>
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#include <linux/device.h>
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#include <linux/dma-direct.h>
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void acpi_arch_dma_setup(struct device *dev)
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{
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int ret;
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u64 end, mask;
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const struct bus_dma_region *map = NULL;
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/*
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* If @dev is expected to be DMA-capable then the bus code that created
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* it should have initialised its dma_mask pointer by this point. For
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* now, we'll continue the legacy behaviour of coercing it to the
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* coherent mask if not, but we'll no longer do so quietly.
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*/
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if (!dev->dma_mask) {
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dev_warn(dev, "DMA mask not set\n");
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dev->dma_mask = &dev->coherent_dma_mask;
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}
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if (dev->coherent_dma_mask)
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end = dev->coherent_dma_mask;
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else
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end = (1ULL << 32) - 1;
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if (dev->dma_range_map) {
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dev_dbg(dev, "dma_range_map already set\n");
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return;
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}
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ret = acpi_dma_get_range(dev, &map);
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if (!ret && map) {
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end = dma_range_map_max(map);
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dev->dma_range_map = map;
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}
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if (ret == -ENODEV)
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ret = iort_dma_get_ranges(dev, &end);
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if (!ret) {
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/*
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* Limit coherent and dma mask based on size retrieved from
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* firmware.
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*/
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mask = DMA_BIT_MASK(ilog2(end) + 1);
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dev->bus_dma_limit = end;
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dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask);
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*dev->dma_mask = min(*dev->dma_mask, mask);
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}
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}
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