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iommu: Add note about struct iommu_fwspec usage

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This structure is to be considered private to the IOMMU API. Except for
very few exceptions, IOMMU consumer drivers should treat this as opaque
data.

Acked-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20221206165945.3551774-2-thierry.reding@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Thierry Reding 2022-12-06 17:59:40 +01:00 committed by Ulf Hansson
parent a234442c0b
commit 495b637f64
1 changed files with 4 additions and 0 deletions
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include/linux/iommu.h
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@ -605,6 +605,10 @@ struct iommu_group *fsl_mc_device_group(struct device *dev);
* @flags: IOMMU_FWSPEC_* flags
* @num_ids: number of associated device IDs
* @ids: IDs which this device may present to the IOMMU
*
* Note that the IDs (and any other information, really) stored in this structure should be
* considered private to the IOMMU device driver and are not to be used directly by IOMMU
* consumers.
*/
struct iommu_fwspec {
const struct iommu_ops *ops;