16.01.2019 23:50, Navneet Kumar пишет:
> * Allocate dma iova cookie for a domain while adding dma iommu
> devices.
> * Perform a stricter check for domain type parameter.
>
Commit message should tell what exactly is getting "fixed". Apparently you're
trying to support T132 ARM64 here.
> Signed-off-by: Navneet Kumar <navne...@nvidia.com>
> ---
> drivers/iommu/tegra-smmu.c | 43 +++++++++++++++++++++++++++----------------
> 1 file changed, 27 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
> index 543f7c9..ee4d8a8 100644
> --- a/drivers/iommu/tegra-smmu.c
> +++ b/drivers/iommu/tegra-smmu.c
> @@ -16,6 +16,7 @@
> #include <linux/platform_device.h>
> #include <linux/slab.h>
> #include <linux/dma-mapping.h>
> +#include <linux/dma-iommu.h>
>
> #include <soc/tegra/ahb.h>
> #include <soc/tegra/mc.h>
> @@ -271,8 +272,10 @@ static bool tegra_smmu_capable(enum iommu_cap cap)
> static struct iommu_domain *tegra_smmu_domain_alloc(unsigned type)
> {
> struct tegra_smmu_as *as;
> + int ret;
>
> - if (type != IOMMU_DOMAIN_UNMANAGED)
> + if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA &&
> + type != IOMMU_DOMAIN_IDENTITY)
> return NULL;
Should be better to write these lines like this for the sake of readability:
if (type != IOMMU_DOMAIN_UNMANAGED &&
type != IOMMU_DOMAIN_DMA &&
type != IOMMU_DOMAIN_IDENTITY)
return NULL;
>
> as = kzalloc(sizeof(*as), GFP_KERNEL);
> @@ -281,26 +284,22 @@ static struct iommu_domain
> *tegra_smmu_domain_alloc(unsigned type)
>
> as->attr = SMMU_PD_READABLE | SMMU_PD_WRITABLE | SMMU_PD_NONSECURE;
>
> + ret = (type == IOMMU_DOMAIN_DMA) ? iommu_get_dma_cookie(&as->domain) :
> + -ENODEV;
This makes to fail allocation of domain that has type other than
IOMMU_DOMAIN_DMA.
Should be:
if (type == IOMMU_DOMAIN_DMA) {
err = iommu_get_dma_cookie(&as->domain);
if (err)
goto free_as;
}
> + if (ret)
> + goto free_as;
> +
> as->pd = alloc_page(GFP_KERNEL | __GFP_DMA | __GFP_ZERO);
> - if (!as->pd) {
> - kfree(as);
> - return NULL;
> - }
> + if (!as->pd)
> + goto put_dma_cookie;
>
> as->count = kcalloc(SMMU_NUM_PDE, sizeof(u32), GFP_KERNEL);
> - if (!as->count) {
> - __free_page(as->pd);
> - kfree(as);
> - return NULL;
> - }
> + if (!as->count)
> + goto free_pd_range;
>
> as->pts = kcalloc(SMMU_NUM_PDE, sizeof(*as->pts), GFP_KERNEL);
> - if (!as->pts) {
> - kfree(as->count);
> - __free_page(as->pd);
> - kfree(as);
> - return NULL;
> - }
> + if (!as->pts)
> + goto free_pts;
>
> /* setup aperture */
> as->domain.geometry.aperture_start = 0;
> @@ -308,6 +307,18 @@ static struct iommu_domain
> *tegra_smmu_domain_alloc(unsigned type)
> as->domain.geometry.force_aperture = true;
>
> return &as->domain;
> +
> +free_pts:
> + kfree(as->pts);
> +free_pd_range:
> + __free_page(as->pd);
> +put_dma_cookie:
> + if (type == IOMMU_DOMAIN_DMA)
> + iommu_put_dma_cookie(&as->domain);
> +free_as:
> + kfree(as);
> +
> + return NULL;
> }
>
> static void tegra_smmu_domain_free(struct iommu_domain *domain)
>
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