From: Lu Baolu <baolu.lu@linux.intel.com>
To: Robin Murphy <robin.murphy@arm.com>, joro@8bytes.org, will@kernel.org
Cc: baolu.lu@linux.intel.com, iommu@lists.linux-foundation.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, suravee.suthikulpanit@amd.com,
john.garry@huawei.com, dianders@chromium.org
Subject: Re: [PATCH v2 14/24] iommu: Introduce explicit type for non-strict DMA domains
Date: Fri, 30 Jul 2021 14:08:40 +0800 [thread overview]
Message-ID: <3e9035ab-5344-acc7-9c74-32c9137aad86@linux.intel.com> (raw)
In-Reply-To: <59a4d350c32a83e21de5dcfe6f041f38b0c35b82.1627468309.git.robin.murphy@arm.com>
On 7/28/21 11:58 PM, Robin Murphy wrote:
> Promote the difference between strict and non-strict DMA domains from an
> internal detail to a distinct domain feature and type, to pave the road
> for exposing it through the sysfs default domain interface.
>
> Signed-off-by: Robin Murphy <robin.murphy@arm.com>
> ---
> drivers/iommu/dma-iommu.c | 2 +-
> drivers/iommu/iommu.c | 8 ++++++--
> include/linux/iommu.h | 11 +++++++++++
> 3 files changed, 18 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> index e28396cea6eb..8b3545c01077 100644
> --- a/drivers/iommu/dma-iommu.c
> +++ b/drivers/iommu/dma-iommu.c
> @@ -1311,7 +1311,7 @@ void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit)
> * The IOMMU core code allocates the default DMA domain, which the
> * underlying IOMMU driver needs to support via the dma-iommu layer.
> */
> - if (domain->type == IOMMU_DOMAIN_DMA) {
> + if (iommu_is_dma_domain(domain)) {
> if (iommu_dma_init_domain(domain, dma_base, dma_limit, dev))
> goto out_err;
> dev->dma_ops = &iommu_dma_ops;
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index fa8109369f74..982545234cf3 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -115,6 +115,7 @@ static const char *iommu_domain_type_str(unsigned int t)
> case IOMMU_DOMAIN_UNMANAGED:
> return "Unmanaged";
> case IOMMU_DOMAIN_DMA:
> + case IOMMU_DOMAIN_DMA_FQ:
> return "Translated";
> default:
> return "Unknown";
> @@ -552,6 +553,9 @@ static ssize_t iommu_group_show_type(struct iommu_group *group,
> case IOMMU_DOMAIN_DMA:
> type = "DMA\n";
> break;
> + case IOMMU_DOMAIN_DMA_FQ:
> + type = "DMA-FQ\n";
> + break;
> }
> }
> mutex_unlock(&group->mutex);
> @@ -765,7 +769,7 @@ static int iommu_create_device_direct_mappings(struct iommu_group *group,
> unsigned long pg_size;
> int ret = 0;
>
> - if (!domain || domain->type != IOMMU_DOMAIN_DMA)
> + if (!domain || !iommu_is_dma_domain(domain))
> return 0;
>
> BUG_ON(!domain->pgsize_bitmap);
> @@ -1947,7 +1951,7 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
> /* Assume all sizes by default; the driver may override this later */
> domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap;
>
> - if (type == IOMMU_DOMAIN_DMA && iommu_get_dma_cookie(domain)) {
> + if (iommu_is_dma_domain(domain) && iommu_get_dma_cookie(domain)) {
> iommu_domain_free(domain);
> domain = NULL;
> }
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 141779d76035..046ba4d54cd2 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -61,6 +61,7 @@ struct iommu_domain_geometry {
> #define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API
> implementation */
> #define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */
> +#define __IOMMU_DOMAIN_DMA_FQ (1U << 3) /* DMA-API uses flush queue */
>
> /*
> * This are the possible domain-types
> @@ -73,12 +74,17 @@ struct iommu_domain_geometry {
> * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations.
> * This flag allows IOMMU drivers to implement
> * certain optimizations for these domains
> + * IOMMU_DOMAIN_DMA_FQ - As above, but definitely using batched TLB
> + * invalidation.
> */
> #define IOMMU_DOMAIN_BLOCKED (0U)
> #define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT)
> #define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING)
> #define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \
> __IOMMU_DOMAIN_DMA_API)
> +#define IOMMU_DOMAIN_DMA_FQ (__IOMMU_DOMAIN_PAGING | \
> + __IOMMU_DOMAIN_DMA_API | \
> + __IOMMU_DOMAIN_DMA_FQ)
>
> struct iommu_domain {
> unsigned type;
> @@ -90,6 +96,11 @@ struct iommu_domain {
> struct iommu_dma_cookie *iova_cookie;
> };
>
> +static inline bool iommu_is_dma_domain(struct iommu_domain *domain)
> +{
> + return domain->type & __IOMMU_DOMAIN_DMA_API;
> +}
> +
> enum iommu_cap {
> IOMMU_CAP_CACHE_COHERENCY, /* IOMMU can enforce cache coherent DMA
> transactions */
>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Best regards,
baolu
next prev parent reply other threads:[~2021-07-30 6:11 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-28 15:58 [PATCH v2 00/24] iommu: Refactor DMA domain strictness Robin Murphy
2021-07-28 15:58 ` [PATCH v2 01/24] iommu: Pull IOVA cookie management into the core Robin Murphy
2021-07-30 6:06 ` Lu Baolu
2021-07-30 9:32 ` Jean-Philippe Brucker
2021-07-28 15:58 ` [PATCH v2 02/24] iommu/amd: Drop IOVA cookie management Robin Murphy
2021-07-28 15:58 ` [PATCH v2 03/24] iommu/arm-smmu: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 04/24] iommu/vt-d: " Robin Murphy
2021-07-30 6:07 ` Lu Baolu
2021-07-28 15:58 ` [PATCH v2 05/24] iommu/exynos: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 06/24] iommu/ipmmu-vmsa: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 07/24] iommu/mtk: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 08/24] iommu/rockchip: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 09/24] iommu/sprd: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 10/24] iommu/sun50i: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 11/24] iommu/virtio: " Robin Murphy
2021-07-30 9:20 ` Jean-Philippe Brucker
2021-07-28 15:58 ` [PATCH v2 12/24] iommu/dma: Unexport " Robin Murphy
2021-07-30 6:07 ` Lu Baolu
2021-07-30 9:21 ` Jean-Philippe Brucker
2021-07-28 15:58 ` [PATCH v2 13/24] iommu/dma: Remove redundant "!dev" checks Robin Murphy
2021-07-30 6:08 ` Lu Baolu
2021-07-28 15:58 ` [PATCH v2 14/24] iommu: Introduce explicit type for non-strict DMA domains Robin Murphy
2021-07-30 6:08 ` Lu Baolu [this message]
2021-07-30 9:23 ` Jean-Philippe Brucker
2021-07-28 15:58 ` [PATCH v2 15/24] iommu/amd: Prepare for multiple DMA domain types Robin Murphy
2021-07-28 15:58 ` [PATCH v2 16/24] iommu/arm-smmu: " Robin Murphy
2021-07-28 15:58 ` [PATCH v2 17/24] iommu/vt-d: " Robin Murphy
2021-07-30 6:09 ` Lu Baolu
2021-07-28 15:58 ` [PATCH v2 18/24] iommu: Express DMA strictness via the domain type Robin Murphy
2021-07-29 7:13 ` Lu Baolu
2021-07-29 9:36 ` Robin Murphy
2021-07-29 12:42 ` Lu Baolu
2021-07-30 6:09 ` Lu Baolu
2021-07-28 15:58 ` [PATCH v2 19/24] iommu: Expose DMA domain strictness via sysfs Robin Murphy
2021-07-30 6:10 ` Lu Baolu
2021-07-30 9:28 ` Jean-Philippe Brucker
2021-07-30 10:20 ` John Garry
2021-07-28 15:58 ` [PATCH v2 20/24] iommu: Merge strictness and domain type configs Robin Murphy
2021-07-30 6:10 ` Lu Baolu
2021-07-30 9:29 ` Jean-Philippe Brucker
2021-07-30 9:33 ` John Garry
2021-07-28 15:58 ` [PATCH v2 21/24] iommu/dma: Factor out flush queue init Robin Murphy
2021-07-30 6:11 ` Lu Baolu
2021-07-30 9:20 ` John Garry
2021-07-28 15:58 ` [PATCH v2 22/24] iommu: Allow enabling non-strict mode dynamically Robin Murphy
2021-07-30 6:11 ` Lu Baolu
2021-07-30 9:24 ` John Garry
2021-07-28 15:58 ` [PATCH v2 23/24] iommu/arm-smmu: Allow non-strict in pgtable_quirks interface Robin Murphy
2021-08-02 13:04 ` Will Deacon
2021-08-02 14:15 ` Robin Murphy
2021-08-03 10:36 ` Will Deacon
2021-08-03 12:13 ` Robin Murphy
2021-08-03 12:35 ` Will Deacon
2021-07-28 15:58 ` [PATCH v2 24/24] iommu: Only log strictness for DMA domains Robin Murphy
2021-07-29 9:04 ` John Garry
2021-07-30 6:12 ` Lu Baolu
2021-07-29 2:55 ` [PATCH v2 00/24] iommu: Refactor DMA domain strictness chenxiang (M)
2021-07-29 10:59 ` Robin Murphy
2021-07-30 1:21 ` chenxiang (M)
2021-07-29 15:04 ` Heiko Stübner
2021-07-29 15:43 ` Robin Murphy
2021-07-29 15:53 ` Heiko Stübner
2021-07-29 16:29 ` Robin Murphy
2021-07-29 22:33 ` Doug Anderson
2021-07-30 0:06 ` Doug Anderson
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