Messages in this thread | | | Subject | Re: [PATCH 10/18] iommu/msm: Add IOMMU_DOMAIN_DMA support | From | Robin Murphy <> | Date | Thu, 20 Aug 2020 17:58:12 +0100 |
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On 2020-08-20 16:55, Rob Clark wrote: > Side note, I suspect we'll end up needing something like > 0e764a01015dfebff8a8ffd297d74663772e248a .. if someone can dig a 32b > device out of the closet and dust it off, the fix is easy enough. > Just wanted to mention that here so anyone with a 32b device could > find what is needed.
FWIW there shouldn't be any material change here - the generic default domain is installed under the same circumstances as the Arm dma_iommu_mapping was, so if any platform does have an issue, then it should already have started 4 years with f78ebca8ff3d ("iommu/msm: Add support for generic master bindings").
Robin.
> > BR, > -R > > On Thu, Aug 20, 2020 at 8:09 AM Robin Murphy <robin.murphy@arm.com> wrote: >> >> Now that arch/arm is wired up for default domains and iommu-dma, >> implement the corresponding driver-side support for DMA domains. >> >> Signed-off-by: Robin Murphy <robin.murphy@arm.com> >> --- >> drivers/iommu/msm_iommu.c | 7 ++++++- >> 1 file changed, 6 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c >> index 3615cd6241c4..f34efcbb0b2b 100644 >> --- a/drivers/iommu/msm_iommu.c >> +++ b/drivers/iommu/msm_iommu.c >> @@ -8,6 +8,7 @@ >> #include <linux/kernel.h> >> #include <linux/init.h> >> #include <linux/platform_device.h> >> +#include <linux/dma-iommu.h> >> #include <linux/errno.h> >> #include <linux/io.h> >> #include <linux/io-pgtable.h> >> @@ -314,13 +315,16 @@ static struct iommu_domain *msm_iommu_domain_alloc(unsigned type) >> { >> struct msm_priv *priv; >> >> - if (type != IOMMU_DOMAIN_UNMANAGED) >> + if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA) >> return NULL; >> >> priv = kzalloc(sizeof(*priv), GFP_KERNEL); >> if (!priv) >> goto fail_nomem; >> >> + if (type == IOMMU_DOMAIN_DMA && iommu_get_dma_cookie(&priv->domain)) >> + goto fail_nomem; >> + >> INIT_LIST_HEAD(&priv->list_attached); >> >> priv->domain.geometry.aperture_start = 0; >> @@ -339,6 +343,7 @@ static void msm_iommu_domain_free(struct iommu_domain *domain) >> struct msm_priv *priv; >> unsigned long flags; >> >> + iommu_put_dma_cookie(domain); >> spin_lock_irqsave(&msm_iommu_lock, flags); >> priv = to_msm_priv(domain); >> kfree(priv); >> -- >> 2.28.0.dirty >> >> _______________________________________________ >> dri-devel mailing list >> dri-devel@lists.freedesktop.org >> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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