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Date: Mon, 28 Nov 2022 13:41:56 +0000
From: Robin Murphy <robin.murphy@....com>
To: Lu Baolu <baolu.lu@...ux.intel.com>,
Joerg Roedel <joro@...tes.org>,
Jason Gunthorpe <jgg@...dia.com>,
Christoph Hellwig <hch@...radead.org>,
Kevin Tian <kevin.tian@...el.com>,
Will Deacon <will@...nel.org>,
Jean-Philippe Brucker <jean-philippe@...aro.org>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
Hector Martin <marcan@...can.st>,
Sven Peter <sven@...npeter.dev>,
Rob Clark <robdclark@...il.com>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Yong Wu <yong.wu@...iatek.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Heiko Stuebner <heiko@...ech.de>,
Matthew Rosato <mjrosato@...ux.ibm.com>,
Orson Zhai <orsonzhai@...il.com>,
Baolin Wang <baolin.wang@...ux.alibaba.com>,
Chunyan Zhang <zhang.lyra@...il.com>,
Chen-Yu Tsai <wens@...e.org>,
Thierry Reding <thierry.reding@...il.com>,
iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 20/20] iommu: Rename attach_dev to set_dev
On 2022-11-28 06:46, Lu Baolu wrote:
> With the retirement of the detach_dev callback, the naming of attach_dev
> isn't meaningful anymore. Rename it to set_dev to restore its real
> meaning, that is, setting an iommu domain to a device.
English grammar alert: this part is confusing, since the usual
in-context reading* of "set[ting] X to Y" is going to imply assigning a
value of Y to some unique property of X. Given the actual semantic that
when we attach the device to the domain, we are setting the (current)
domain as a property of the device, I think the most logical and
intuitive abbreviation for this method would be set_domain(), where the
target device is then clearly implied by the argument (as the target
domain was for attach_dev()).
FWIW I also wouldn't say that "attach" loses its meaning in a context
where an equivalent "detach" operation is only ever implicit in
reattaching to something else, however I do agree that it *is* worth
switching the terminology to clearly differentiate this internal
behaviour from the public attach/detach API for unmanaged domains.
Thanks,
Robin.
[*] Note that It's not strictly incorrect, but "set to" in the sense of
starting work, e.g. "At 6PM I set to cooking dinner", is much less
commonly used, especially in code. Although I think technically
set_dev_to(dev, domain) would work gramatically to abbreviate that sense
of "set device to start using domain", it's still rather obscure and not
much less ambiguous.
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
> include/linux/iommu.h | 4 ++--
> drivers/iommu/amd/iommu.c | 2 +-
> drivers/iommu/apple-dart.c | 2 +-
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 2 +-
> drivers/iommu/arm/arm-smmu/arm-smmu.c | 2 +-
> drivers/iommu/arm/arm-smmu/qcom_iommu.c | 2 +-
> drivers/iommu/exynos-iommu.c | 2 +-
> drivers/iommu/fsl_pamu_domain.c | 2 +-
> drivers/iommu/intel/iommu.c | 4 ++--
> drivers/iommu/iommu.c | 4 ++--
> drivers/iommu/ipmmu-vmsa.c | 2 +-
> drivers/iommu/msm_iommu.c | 2 +-
> drivers/iommu/mtk_iommu.c | 2 +-
> drivers/iommu/mtk_iommu_v1.c | 2 +-
> drivers/iommu/omap-iommu.c | 2 +-
> drivers/iommu/rockchip-iommu.c | 2 +-
> drivers/iommu/s390-iommu.c | 2 +-
> drivers/iommu/sprd-iommu.c | 2 +-
> drivers/iommu/sun50i-iommu.c | 2 +-
> drivers/iommu/tegra-gart.c | 2 +-
> drivers/iommu/tegra-smmu.c | 2 +-
> drivers/iommu/virtio-iommu.c | 2 +-
> 22 files changed, 25 insertions(+), 25 deletions(-)
>
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 4c0491e5708c..1def4b4bb2b9 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -281,7 +281,7 @@ struct iommu_ops {
>
> /**
> * struct iommu_domain_ops - domain specific operations
> - * @attach_dev: attach an iommu domain to a device
> + * @set_dev: set an iommu domain to a device
> * Return:
> * * 0 - success
> * * EINVAL - can indicate that device and domain are incompatible due to
> @@ -313,7 +313,7 @@ struct iommu_ops {
> * @free: Release the domain after use.
> */
> struct iommu_domain_ops {
> - int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
> + int (*set_dev)(struct iommu_domain *domain, struct device *dev);
> int (*set_dev_pasid)(struct iommu_domain *domain, struct device *dev,
> ioasid_t pasid);
>
> diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
> index bd1970b4f48b..f628bd0f9632 100644
> --- a/drivers/iommu/amd/iommu.c
> +++ b/drivers/iommu/amd/iommu.c
> @@ -2388,7 +2388,7 @@ const struct iommu_ops amd_iommu_ops = {
> .pgsize_bitmap = AMD_IOMMU_PGSIZES,
> .def_domain_type = amd_iommu_def_domain_type,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = amd_iommu_attach_device,
> + .set_dev = amd_iommu_attach_device,
> .map_pages = amd_iommu_map_pages,
> .unmap_pages = amd_iommu_unmap_pages,
> .iotlb_sync_map = amd_iommu_iotlb_sync_map,
> diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
> index 6fbe6b275c79..77c9e7d3e1a2 100644
> --- a/drivers/iommu/apple-dart.c
> +++ b/drivers/iommu/apple-dart.c
> @@ -763,7 +763,7 @@ static const struct iommu_ops apple_dart_iommu_ops = {
> .pgsize_bitmap = -1UL, /* Restricted during dart probe */
> .owner = THIS_MODULE,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = apple_dart_attach_dev,
> + .set_dev = apple_dart_attach_dev,
> .map_pages = apple_dart_map_pages,
> .unmap_pages = apple_dart_unmap_pages,
> .flush_iotlb_all = apple_dart_flush_iotlb_all,
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> index ab160198edd6..194c304c5ee8 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -2859,7 +2859,7 @@ static struct iommu_ops arm_smmu_ops = {
> .pgsize_bitmap = -1UL, /* Restricted during device attach */
> .owner = THIS_MODULE,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = arm_smmu_attach_dev,
> + .set_dev = arm_smmu_attach_dev,
> .map_pages = arm_smmu_map_pages,
> .unmap_pages = arm_smmu_unmap_pages,
> .flush_iotlb_all = arm_smmu_flush_iotlb_all,
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> index 719fbca1fe52..e31002d84b4a 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> @@ -1567,7 +1567,7 @@ static struct iommu_ops arm_smmu_ops = {
> .pgsize_bitmap = -1UL, /* Restricted during device attach */
> .owner = THIS_MODULE,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = arm_smmu_attach_dev,
> + .set_dev = arm_smmu_attach_dev,
> .map_pages = arm_smmu_map_pages,
> .unmap_pages = arm_smmu_unmap_pages,
> .flush_iotlb_all = arm_smmu_flush_iotlb_all,
> diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
> index d7be3adee426..195add905364 100644
> --- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c
> +++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
> @@ -560,7 +560,7 @@ static const struct iommu_ops qcom_iommu_ops = {
> .of_xlate = qcom_iommu_of_xlate,
> .pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = qcom_iommu_attach_dev,
> + .set_dev = qcom_iommu_attach_dev,
> .map_pages = qcom_iommu_map,
> .unmap_pages = qcom_iommu_unmap,
> .flush_iotlb_all = qcom_iommu_flush_iotlb_all,
> diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
> index 29ec713e8a21..7e735929e395 100644
> --- a/drivers/iommu/exynos-iommu.c
> +++ b/drivers/iommu/exynos-iommu.c
> @@ -1403,7 +1403,7 @@ static const struct iommu_ops exynos_iommu_ops = {
> .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE,
> .of_xlate = exynos_iommu_of_xlate,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = exynos_iommu_attach_device,
> + .set_dev = exynos_iommu_attach_device,
> .map = exynos_iommu_map,
> .unmap = exynos_iommu_unmap,
> .iova_to_phys = exynos_iommu_iova_to_phys,
> diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
> index 272d88e415c6..c66e48b0ed6f 100644
> --- a/drivers/iommu/fsl_pamu_domain.c
> +++ b/drivers/iommu/fsl_pamu_domain.c
> @@ -462,7 +462,7 @@ static const struct iommu_ops fsl_pamu_ops = {
> .device_group = fsl_pamu_device_group,
> .set_platform_dma = fsl_pamu_set_platform_dma;
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = fsl_pamu_attach_device,
> + .set_dev = fsl_pamu_attach_device,
> .iova_to_phys = fsl_pamu_iova_to_phys,
> .free = fsl_pamu_domain_free,
> }
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index cd71194fe7a6..7bcadb702e00 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -4131,7 +4131,7 @@ static int blocking_domain_attach_dev(struct iommu_domain *domain,
>
> static struct iommu_domain blocking_domain = {
> .ops = &(const struct iommu_domain_ops) {
> - .attach_dev = blocking_domain_attach_dev,
> + .set_dev = blocking_domain_attach_dev,
> .free = intel_iommu_domain_free
> }
> };
> @@ -4750,7 +4750,7 @@ const struct iommu_ops intel_iommu_ops = {
> .page_response = intel_svm_page_response,
> #endif
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = intel_iommu_attach_device,
> + .set_dev = intel_iommu_attach_device,
> .map_pages = intel_iommu_map_pages,
> .unmap_pages = intel_iommu_unmap_pages,
> .iotlb_sync_map = intel_iommu_iotlb_sync_map,
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index e4966f088184..dca31065cdb5 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -1983,10 +1983,10 @@ static int __iommu_attach_device(struct iommu_domain *domain,
> {
> int ret;
>
> - if (unlikely(domain->ops->attach_dev == NULL))
> + if (unlikely(!domain->ops->set_dev))
> return -ENODEV;
>
> - ret = domain->ops->attach_dev(domain, dev);
> + ret = domain->ops->set_dev(domain, dev);
> if (!ret)
> trace_attach_device_to_domain(dev);
> return ret;
> diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
> index 3112822ac7be..8d40a2c150d4 100644
> --- a/drivers/iommu/ipmmu-vmsa.c
> +++ b/drivers/iommu/ipmmu-vmsa.c
> @@ -860,7 +860,7 @@ static const struct iommu_ops ipmmu_ops = {
> .pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
> .of_xlate = ipmmu_of_xlate,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = ipmmu_attach_device,
> + .set_dev = ipmmu_attach_device,
> .map_pages = ipmmu_map,
> .unmap_pages = ipmmu_unmap,
> .flush_iotlb_all = ipmmu_flush_iotlb_all,
> diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
> index 564f9dc0140d..9f7432443726 100644
> --- a/drivers/iommu/msm_iommu.c
> +++ b/drivers/iommu/msm_iommu.c
> @@ -690,7 +690,7 @@ static struct iommu_ops msm_iommu_ops = {
> .pgsize_bitmap = MSM_IOMMU_PGSIZES,
> .of_xlate = qcom_iommu_of_xlate,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = msm_iommu_attach_dev,
> + .set_dev = msm_iommu_attach_dev,
> .map_pages = msm_iommu_map,
> .unmap_pages = msm_iommu_unmap,
> /*
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 2022f47529c1..6bd4eb39c08f 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -940,7 +940,7 @@ static const struct iommu_ops mtk_iommu_ops = {
> .pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M,
> .owner = THIS_MODULE,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = mtk_iommu_attach_device,
> + .set_dev = mtk_iommu_attach_device,
> .map_pages = mtk_iommu_map,
> .unmap_pages = mtk_iommu_unmap,
> .flush_iotlb_all = mtk_iommu_flush_iotlb_all,
> diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
> index c2d80b7a377f..785fc1569bc7 100644
> --- a/drivers/iommu/mtk_iommu_v1.c
> +++ b/drivers/iommu/mtk_iommu_v1.c
> @@ -596,7 +596,7 @@ static const struct iommu_ops mtk_iommu_v1_ops = {
> .set_platform_dma = mtk_iommu_v1_set_platform_dma,
> .owner = THIS_MODULE,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = mtk_iommu_v1_attach_device,
> + .set_dev = mtk_iommu_v1_attach_device,
> .map_pages = mtk_iommu_v1_map,
> .unmap_pages = mtk_iommu_v1_unmap,
> .iova_to_phys = mtk_iommu_v1_iova_to_phys,
> diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
> index c3eedab00038..6f1031336611 100644
> --- a/drivers/iommu/omap-iommu.c
> +++ b/drivers/iommu/omap-iommu.c
> @@ -1748,7 +1748,7 @@ static const struct iommu_ops omap_iommu_ops = {
> .set_platform_dma = omap_iommu_set_platform_dma,
> .pgsize_bitmap = OMAP_IOMMU_PGSIZES,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = omap_iommu_attach_dev,
> + .set_dev = omap_iommu_attach_dev,
> .map = omap_iommu_map,
> .unmap = omap_iommu_unmap,
> .iova_to_phys = omap_iommu_iova_to_phys,
> diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
> index f30db22ea5d7..5381dbf624ad 100644
> --- a/drivers/iommu/rockchip-iommu.c
> +++ b/drivers/iommu/rockchip-iommu.c
> @@ -1191,7 +1191,7 @@ static const struct iommu_ops rk_iommu_ops = {
> .pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP,
> .of_xlate = rk_iommu_of_xlate,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = rk_iommu_attach_device,
> + .set_dev = rk_iommu_attach_device,
> .map = rk_iommu_map,
> .unmap = rk_iommu_unmap,
> .iova_to_phys = rk_iommu_iova_to_phys,
> diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
> index 33dba5ee5e20..5fa8ea6687e7 100644
> --- a/drivers/iommu/s390-iommu.c
> +++ b/drivers/iommu/s390-iommu.c
> @@ -447,7 +447,7 @@ static const struct iommu_ops s390_iommu_ops = {
> .pgsize_bitmap = SZ_4K,
> .get_resv_regions = s390_iommu_get_resv_regions,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = s390_iommu_attach_device,
> + .set_dev = s390_iommu_attach_device,
> .map_pages = s390_iommu_map_pages,
> .unmap_pages = s390_iommu_unmap_pages,
> .flush_iotlb_all = s390_iommu_flush_iotlb_all,
> diff --git a/drivers/iommu/sprd-iommu.c b/drivers/iommu/sprd-iommu.c
> index ae94d74b73f4..e105fa476e94 100644
> --- a/drivers/iommu/sprd-iommu.c
> +++ b/drivers/iommu/sprd-iommu.c
> @@ -398,7 +398,7 @@ static const struct iommu_ops sprd_iommu_ops = {
> .pgsize_bitmap = SPRD_IOMMU_PAGE_SIZE,
> .owner = THIS_MODULE,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = sprd_iommu_attach_device,
> + .set_dev = sprd_iommu_attach_device,
> .map_pages = sprd_iommu_map,
> .unmap_pages = sprd_iommu_unmap,
> .iotlb_sync_map = sprd_iommu_sync_map,
> diff --git a/drivers/iommu/sun50i-iommu.c b/drivers/iommu/sun50i-iommu.c
> index 37b074be87a5..2a35148c2b65 100644
> --- a/drivers/iommu/sun50i-iommu.c
> +++ b/drivers/iommu/sun50i-iommu.c
> @@ -834,7 +834,7 @@ static const struct iommu_ops sun50i_iommu_ops = {
> .of_xlate = sun50i_iommu_of_xlate,
> .probe_device = sun50i_iommu_probe_device,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = sun50i_iommu_attach_device,
> + .set_dev = sun50i_iommu_attach_device,
> .flush_iotlb_all = sun50i_iommu_flush_iotlb_all,
> .iotlb_sync_map = sun50i_iommu_iotlb_sync_map,
> .iotlb_sync = sun50i_iommu_iotlb_sync,
> diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
> index a532b333233f..2b3944d10735 100644
> --- a/drivers/iommu/tegra-gart.c
> +++ b/drivers/iommu/tegra-gart.c
> @@ -282,7 +282,7 @@ static const struct iommu_ops gart_iommu_ops = {
> .pgsize_bitmap = GART_IOMMU_PGSIZES,
> .of_xlate = gart_iommu_of_xlate,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = gart_iommu_attach_dev,
> + .set_dev = gart_iommu_attach_dev,
> .map = gart_iommu_map,
> .unmap = gart_iommu_unmap,
> .iova_to_phys = gart_iommu_iova_to_phys,
> diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
> index 247d485904c1..b9f035069794 100644
> --- a/drivers/iommu/tegra-smmu.c
> +++ b/drivers/iommu/tegra-smmu.c
> @@ -977,7 +977,7 @@ static const struct iommu_ops tegra_smmu_ops = {
> .of_xlate = tegra_smmu_of_xlate,
> .pgsize_bitmap = SZ_4K,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = tegra_smmu_attach_dev,
> + .set_dev = tegra_smmu_attach_dev,
> .map = tegra_smmu_map,
> .unmap = tegra_smmu_unmap,
> .iova_to_phys = tegra_smmu_iova_to_phys,
> diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
> index 5b8fe9bfa9a5..c407c4b213db 100644
> --- a/drivers/iommu/virtio-iommu.c
> +++ b/drivers/iommu/virtio-iommu.c
> @@ -1028,7 +1028,7 @@ static struct iommu_ops viommu_ops = {
> .of_xlate = viommu_of_xlate,
> .owner = THIS_MODULE,
> .default_domain_ops = &(const struct iommu_domain_ops) {
> - .attach_dev = viommu_attach_dev,
> + .set_dev = viommu_attach_dev,
> .map_pages = viommu_map_pages,
> .unmap_pages = viommu_unmap_pages,
> .iova_to_phys = viommu_iova_to_phys,
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