diff mbox series

[10/18] iommu/msm: Add IOMMU_DOMAIN_DMA support

Message ID 93d7de3533cfd952aecd6198b9221d7a58c0e521.1597931876.git.robin.murphy@arm.com (mailing list archive)
State Not Applicable, archived
Headers
Series Convert arch/arm to use iommu-dma |

Commit Message

Robin Murphy Aug. 20, 2020, 3:08 p.m. UTC 
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(-)

Comments

Rob Clark Aug. 20, 2020, 3:55 p.m. UTC | #1 
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.

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
Robin Murphy Aug. 20, 2020, 4:58 p.m. UTC | #2 
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
Rob Clark Aug. 20, 2020, 5:05 p.m. UTC | #3 
On Thu, Aug 20, 2020 at 9:58 AM Robin Murphy <robin.murphy@arm.com> wrote:
>
> 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").

ok, it has, I guess, been a while since playing with 32b things..
someone on IRC had mentioned a problem that sounded like what
0e764a01015dfebff8a8ffd297d74663772e248a solved, unless they disabled
some ARCH_HAS_xyz thing (IIRC), which I guess is related..

BR,
-R

> 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
diff mbox series

Patch

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);