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* [PATCH] dma-pool: Do not allocate pool memory from CMA
@ 2020-07-08 16:49 Nicolas Saenz Julienne
  2020-07-08 16:58 ` Christoph Hellwig
                   ` (3 more replies)
  0 siblings, 4 replies; 28+ messages in thread
From: Nicolas Saenz Julienne @ 2020-07-08 16:49 UTC (permalink / raw)
  To: Christoph Hellwig, Marek Szyprowski, Robin Murphy, David Rientjes
  Cc: iommu, linux-rpi-kernel, jeremy.linton, linux-kernel

There is no guarantee to CMA's placement, so allocating a zone specific
atomic pool from CMA might return memory from a completely different
memory zone. So stop using it.

Fixes: c84dc6e68a1d ("dma-pool: add additional coherent pools to map to gfp mask")
Reported-by: Jeremy Linton <jeremy.linton@arm.com>
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---

An more costly alternative would be adding an option to
dma_alloc_from_contiguous() so it fails when the allocation doesn't fall
in a specific zone.

 kernel/dma/pool.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
index 8cfa01243ed2..4bc1c46ae6ef 100644
--- a/kernel/dma/pool.c
+++ b/kernel/dma/pool.c
@@ -6,7 +6,6 @@
 #include <linux/debugfs.h>
 #include <linux/dma-direct.h>
 #include <linux/dma-noncoherent.h>
-#include <linux/dma-contiguous.h>
 #include <linux/init.h>
 #include <linux/genalloc.h>
 #include <linux/set_memory.h>
@@ -69,12 +68,7 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
 
 	do {
 		pool_size = 1 << (PAGE_SHIFT + order);
-
-		if (dev_get_cma_area(NULL))
-			page = dma_alloc_from_contiguous(NULL, 1 << order,
-							 order, false);
-		else
-			page = alloc_pages(gfp, order);
+		page = alloc_pages(gfp, order);
 	} while (!page && order-- > 0);
 	if (!page)
 		goto out;
@@ -118,8 +112,7 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
 	dma_common_free_remap(addr, pool_size);
 #endif
 free_page: __maybe_unused
-	if (!dma_release_from_contiguous(NULL, page, 1 << order))
-		__free_pages(page, order);
+	__free_pages(page, order);
 out:
 	return ret;
 }
-- 
2.27.0

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^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-08 16:49 [PATCH] dma-pool: Do not allocate pool memory from CMA Nicolas Saenz Julienne
@ 2020-07-08 16:58 ` Christoph Hellwig
  2020-07-08 23:14 ` Jeremy Linton
                   ` (2 subsequent siblings)
  3 siblings, 0 replies; 28+ messages in thread
From: Christoph Hellwig @ 2020-07-08 16:58 UTC (permalink / raw)
  To: Nicolas Saenz Julienne
  Cc: linux-kernel, jeremy.linton, iommu, linux-rpi-kernel,
	David Rientjes, Robin Murphy, Christoph Hellwig

On Wed, Jul 08, 2020 at 06:49:39PM +0200, Nicolas Saenz Julienne wrote:
> There is no guarantee to CMA's placement, so allocating a zone specific
> atomic pool from CMA might return memory from a completely different
> memory zone. So stop using it.
> 
> Fixes: c84dc6e68a1d ("dma-pool: add additional coherent pools to map to gfp mask")
> Reported-by: Jeremy Linton <jeremy.linton@arm.com>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> ---
> 
> An more costly alternative would be adding an option to
> dma_alloc_from_contiguous() so it fails when the allocation doesn't fall
> in a specific zone.

Which seems like the right thing to do.  But then again for 5.8 I think
something less invasive like your patch might be better.  Waiting for
a few more opinions for now.
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^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-08 16:49 [PATCH] dma-pool: Do not allocate pool memory from CMA Nicolas Saenz Julienne
  2020-07-08 16:58 ` Christoph Hellwig
@ 2020-07-08 23:14 ` Jeremy Linton
  2020-07-09 21:47 ` David Rientjes via iommu
  2020-07-21  7:21 ` Amit Pundir
  3 siblings, 0 replies; 28+ messages in thread
From: Jeremy Linton @ 2020-07-08 23:14 UTC (permalink / raw)
  To: Nicolas Saenz Julienne, Christoph Hellwig, Marek Szyprowski,
	Robin Murphy, David Rientjes
  Cc: iommu, linux-rpi-kernel, linux-kernel

Hi,

On 7/8/20 11:49 AM, Nicolas Saenz Julienne wrote:
> There is no guarantee to CMA's placement, so allocating a zone specific
> atomic pool from CMA might return memory from a completely different
> memory zone. So stop using it.
> 
> Fixes: c84dc6e68a1d ("dma-pool: add additional coherent pools to map to gfp mask")
> Reported-by: Jeremy Linton <jeremy.linton@arm.com>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> ---

With this patch and 
https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg2226971.html 
the machine appears to be working fine with/without CMA and in both 
DT/ACPI mode.

The JBOD/etc I was having problems with are working fine, and the rtlsdr 
seems to be working better now too (its still not perfect, but that is 
likely another issue).

so:

tested-by: Jeremy Linton <jeremy.linton@arm.com>

thanks!


> 
> An more costly alternative would be adding an option to
> dma_alloc_from_contiguous() so it fails when the allocation doesn't fall
> in a specific zone.
> 
>   kernel/dma/pool.c | 11 ++---------
>   1 file changed, 2 insertions(+), 9 deletions(-)
> 
> diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> index 8cfa01243ed2..4bc1c46ae6ef 100644
> --- a/kernel/dma/pool.c
> +++ b/kernel/dma/pool.c
> @@ -6,7 +6,6 @@
>   #include <linux/debugfs.h>
>   #include <linux/dma-direct.h>
>   #include <linux/dma-noncoherent.h>
> -#include <linux/dma-contiguous.h>
>   #include <linux/init.h>
>   #include <linux/genalloc.h>
>   #include <linux/set_memory.h>
> @@ -69,12 +68,7 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
>   
>   	do {
>   		pool_size = 1 << (PAGE_SHIFT + order);
> -
> -		if (dev_get_cma_area(NULL))
> -			page = dma_alloc_from_contiguous(NULL, 1 << order,
> -							 order, false);
> -		else
> -			page = alloc_pages(gfp, order);
> +		page = alloc_pages(gfp, order);
>   	} while (!page && order-- > 0);
>   	if (!page)
>   		goto out;
> @@ -118,8 +112,7 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
>   	dma_common_free_remap(addr, pool_size);
>   #endif
>   free_page: __maybe_unused
> -	if (!dma_release_from_contiguous(NULL, page, 1 << order))
> -		__free_pages(page, order);
> +	__free_pages(page, order);
>   out:
>   	return ret;
>   }
> 

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https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-08 16:49 [PATCH] dma-pool: Do not allocate pool memory from CMA Nicolas Saenz Julienne
  2020-07-08 16:58 ` Christoph Hellwig
  2020-07-08 23:14 ` Jeremy Linton
@ 2020-07-09 21:47 ` David Rientjes via iommu
  2020-07-21  7:21 ` Amit Pundir
  3 siblings, 0 replies; 28+ messages in thread
From: David Rientjes via iommu @ 2020-07-09 21:47 UTC (permalink / raw)
  To: Nicolas Saenz Julienne
  Cc: linux-kernel, jeremy.linton, iommu, linux-rpi-kernel,
	Robin Murphy, Christoph Hellwig

On Wed, 8 Jul 2020, Nicolas Saenz Julienne wrote:

> There is no guarantee to CMA's placement, so allocating a zone specific
> atomic pool from CMA might return memory from a completely different
> memory zone. So stop using it.
> 
> Fixes: c84dc6e68a1d ("dma-pool: add additional coherent pools to map to gfp mask")
> Reported-by: Jeremy Linton <jeremy.linton@arm.com>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>

Acked-by: David Rientjes <rientjes@google.com>

Thanks Nicolas!
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^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-08 16:49 [PATCH] dma-pool: Do not allocate pool memory from CMA Nicolas Saenz Julienne
                   ` (2 preceding siblings ...)
  2020-07-09 21:47 ` David Rientjes via iommu
@ 2020-07-21  7:21 ` Amit Pundir
  2020-07-21  8:39   ` Nicolas Saenz Julienne
  3 siblings, 1 reply; 28+ messages in thread
From: Amit Pundir @ 2020-07-21  7:21 UTC (permalink / raw)
  To: Nicolas Saenz Julienne
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

On Wed, 8 Jul 2020 at 22:43, Nicolas Saenz Julienne
<nsaenzjulienne@suse.de> wrote:
>
> There is no guarantee to CMA's placement, so allocating a zone specific
> atomic pool from CMA might return memory from a completely different
> memory zone. So stop using it.
>
> Fixes: c84dc6e68a1d ("dma-pool: add additional coherent pools to map to gfp mask")

Hi Nicolas,

I see a boot regression with this commit d9765e41d8e9 "dma-pool:
Do not allocate pool memory from CMA" on my Xiaomi Poco F1
(Qcom sdm845) phone running v5.8-rc6. I can't boot past the
bootloader splash screen with this patch.

Phone boots fine if I revert this patch. I carry only one out of tree
dts patch https://lkml.org/lkml/2020/6/25/52. And since this is a stock
phone, I don't have access to serial/dmesg logs until I boot to AOSP
(adb) shell.

Any thoughts as to what might be going wrong here? I'd be happy to
help debug things. For what it's worth, I don't see this regression on
other two sdm845 devices (db845c and Pixel 3) I tested on.

Regards,
Amit Pundir

> Reported-by: Jeremy Linton <jeremy.linton@arm.com>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> ---
>
> An more costly alternative would be adding an option to
> dma_alloc_from_contiguous() so it fails when the allocation doesn't fall
> in a specific zone.
>
>  kernel/dma/pool.c | 11 ++---------
>  1 file changed, 2 insertions(+), 9 deletions(-)
>
> diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> index 8cfa01243ed2..4bc1c46ae6ef 100644
> --- a/kernel/dma/pool.c
> +++ b/kernel/dma/pool.c
> @@ -6,7 +6,6 @@
>  #include <linux/debugfs.h>
>  #include <linux/dma-direct.h>
>  #include <linux/dma-noncoherent.h>
> -#include <linux/dma-contiguous.h>
>  #include <linux/init.h>
>  #include <linux/genalloc.h>
>  #include <linux/set_memory.h>
> @@ -69,12 +68,7 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
>
>         do {
>                 pool_size = 1 << (PAGE_SHIFT + order);
> -
> -               if (dev_get_cma_area(NULL))
> -                       page = dma_alloc_from_contiguous(NULL, 1 << order,
> -                                                        order, false);
> -               else
> -                       page = alloc_pages(gfp, order);
> +               page = alloc_pages(gfp, order);
>         } while (!page && order-- > 0);
>         if (!page)
>                 goto out;
> @@ -118,8 +112,7 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
>         dma_common_free_remap(addr, pool_size);
>  #endif
>  free_page: __maybe_unused
> -       if (!dma_release_from_contiguous(NULL, page, 1 << order))
> -               __free_pages(page, order);
> +       __free_pages(page, order);
>  out:
>         return ret;
>  }
> --
> 2.27.0
>
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^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-21  7:21 ` Amit Pundir
@ 2020-07-21  8:39   ` Nicolas Saenz Julienne
  2020-07-21  8:54     ` Amit Pundir
  0 siblings, 1 reply; 28+ messages in thread
From: Nicolas Saenz Julienne @ 2020-07-21  8:39 UTC (permalink / raw)
  To: Amit Pundir
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

Hi Amit,

On Tue, 2020-07-21 at 12:51 +0530, Amit Pundir wrote:
> On Wed, 8 Jul 2020 at 22:43, Nicolas Saenz Julienne
> <nsaenzjulienne@suse.de> wrote:
> > There is no guarantee to CMA's placement, so allocating a zone
> > specific
> > atomic pool from CMA might return memory from a completely
> > different
> > memory zone. So stop using it.
> > 
> > Fixes: c84dc6e68a1d ("dma-pool: add additional coherent pools to
> > map to gfp mask")
> 
> Hi Nicolas,
> 
> I see a boot regression with this commit d9765e41d8e9 "dma-pool:
> Do not allocate pool memory from CMA" on my Xiaomi Poco F1
> (Qcom sdm845) phone running v5.8-rc6. I can't boot past the
> bootloader splash screen with this patch.
> 
> Phone boots fine if I revert this patch. I carry only one out of tree
> dts patch https://lkml.org/lkml/2020/6/25/52. And since this is a
> stock
> phone, I don't have access to serial/dmesg logs until I boot to AOSP
> (adb) shell.
> 
> Any thoughts as to what might be going wrong here? I'd be happy to
> help debug things. For what it's worth, I don't see this regression
> on
> other two sdm845 devices (db845c and Pixel 3) I tested on.

Can you provide a boot log (even if without my patch) and the device-
tree files? It'd help a lot figuring things out.

Regards,
Nicolas

> Regards,
> Amit Pundir
> 
> > Reported-by: Jeremy Linton <jeremy.linton@arm.com>
> > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> > ---
> > 
> > An more costly alternative would be adding an option to
> > dma_alloc_from_contiguous() so it fails when the allocation doesn't
> > fall
> > in a specific zone.
> > 
> >  kernel/dma/pool.c | 11 ++---------
> >  1 file changed, 2 insertions(+), 9 deletions(-)
> > 
> > diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> > index 8cfa01243ed2..4bc1c46ae6ef 100644
> > --- a/kernel/dma/pool.c
> > +++ b/kernel/dma/pool.c
> > @@ -6,7 +6,6 @@
> >  #include <linux/debugfs.h>
> >  #include <linux/dma-direct.h>
> >  #include <linux/dma-noncoherent.h>
> > -#include <linux/dma-contiguous.h>
> >  #include <linux/init.h>
> >  #include <linux/genalloc.h>
> >  #include <linux/set_memory.h>
> > @@ -69,12 +68,7 @@ static int atomic_pool_expand(struct gen_pool
> > *pool, size_t pool_size,
> > 
> >         do {
> >                 pool_size = 1 << (PAGE_SHIFT + order);
> > -
> > -               if (dev_get_cma_area(NULL))
> > -                       page = dma_alloc_from_contiguous(NULL, 1 <<
> > order,
> > -                                                        order,
> > false);
> > -               else
> > -                       page = alloc_pages(gfp, order);
> > +               page = alloc_pages(gfp, order);
> >         } while (!page && order-- > 0);
> >         if (!page)
> >                 goto out;
> > @@ -118,8 +112,7 @@ static int atomic_pool_expand(struct gen_pool
> > *pool, size_t pool_size,
> >         dma_common_free_remap(addr, pool_size);
> >  #endif
> >  free_page: __maybe_unused
> > -       if (!dma_release_from_contiguous(NULL, page, 1 << order))
> > -               __free_pages(page, order);
> > +       __free_pages(page, order);
> >  out:
> >         return ret;
> >  }
> > --
> > 2.27.0
> > 

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https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-21  8:39   ` Nicolas Saenz Julienne
@ 2020-07-21  8:54     ` Amit Pundir
  2020-07-21 11:15       ` Nicolas Saenz Julienne
  0 siblings, 1 reply; 28+ messages in thread
From: Amit Pundir @ 2020-07-21  8:54 UTC (permalink / raw)
  To: Nicolas Saenz Julienne
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

On Tue, 21 Jul 2020 at 14:09, Nicolas Saenz Julienne
<nsaenzjulienne@suse.de> wrote:
>
> Hi Amit,
>
> On Tue, 2020-07-21 at 12:51 +0530, Amit Pundir wrote:
> > On Wed, 8 Jul 2020 at 22:43, Nicolas Saenz Julienne
> > <nsaenzjulienne@suse.de> wrote:
> > > There is no guarantee to CMA's placement, so allocating a zone
> > > specific
> > > atomic pool from CMA might return memory from a completely
> > > different
> > > memory zone. So stop using it.
> > >
> > > Fixes: c84dc6e68a1d ("dma-pool: add additional coherent pools to
> > > map to gfp mask")
> >
> > Hi Nicolas,
> >
> > I see a boot regression with this commit d9765e41d8e9 "dma-pool:
> > Do not allocate pool memory from CMA" on my Xiaomi Poco F1
> > (Qcom sdm845) phone running v5.8-rc6. I can't boot past the
> > bootloader splash screen with this patch.
> >
> > Phone boots fine if I revert this patch. I carry only one out of tree
> > dts patch https://lkml.org/lkml/2020/6/25/52. And since this is a
> > stock
> > phone, I don't have access to serial/dmesg logs until I boot to AOSP
> > (adb) shell.
> >
> > Any thoughts as to what might be going wrong here? I'd be happy to
> > help debug things. For what it's worth, I don't see this regression
> > on
> > other two sdm845 devices (db845c and Pixel 3) I tested on.
>
> Can you provide a boot log (even if without my patch) and the device-
> tree files? It'd help a lot figuring things out.

Thank you for the prompt reply Nicolas.

Here is the boot log with the reverted patch
https://pastebin.ubuntu.com/p/BrhPf83nKF/

Here is my phone's dts
https://github.com/pundiramit/linux/commit/2a394c199deeaf4c91e0e008e8fba2a72f494d8c

And here is my kernel tree just in case
https://github.com/pundiramit/linux/commits/beryllium-mainline

Regards,
Amit Pundir


>
> Regards,
> Nicolas
>
> > Regards,
> > Amit Pundir
> >
> > > Reported-by: Jeremy Linton <jeremy.linton@arm.com>
> > > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> > > ---
> > >
> > > An more costly alternative would be adding an option to
> > > dma_alloc_from_contiguous() so it fails when the allocation doesn't
> > > fall
> > > in a specific zone.
> > >
> > >  kernel/dma/pool.c | 11 ++---------
> > >  1 file changed, 2 insertions(+), 9 deletions(-)
> > >
> > > diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> > > index 8cfa01243ed2..4bc1c46ae6ef 100644
> > > --- a/kernel/dma/pool.c
> > > +++ b/kernel/dma/pool.c
> > > @@ -6,7 +6,6 @@
> > >  #include <linux/debugfs.h>
> > >  #include <linux/dma-direct.h>
> > >  #include <linux/dma-noncoherent.h>
> > > -#include <linux/dma-contiguous.h>
> > >  #include <linux/init.h>
> > >  #include <linux/genalloc.h>
> > >  #include <linux/set_memory.h>
> > > @@ -69,12 +68,7 @@ static int atomic_pool_expand(struct gen_pool
> > > *pool, size_t pool_size,
> > >
> > >         do {
> > >                 pool_size = 1 << (PAGE_SHIFT + order);
> > > -
> > > -               if (dev_get_cma_area(NULL))
> > > -                       page = dma_alloc_from_contiguous(NULL, 1 <<
> > > order,
> > > -                                                        order,
> > > false);
> > > -               else
> > > -                       page = alloc_pages(gfp, order);
> > > +               page = alloc_pages(gfp, order);
> > >         } while (!page && order-- > 0);
> > >         if (!page)
> > >                 goto out;
> > > @@ -118,8 +112,7 @@ static int atomic_pool_expand(struct gen_pool
> > > *pool, size_t pool_size,
> > >         dma_common_free_remap(addr, pool_size);
> > >  #endif
> > >  free_page: __maybe_unused
> > > -       if (!dma_release_from_contiguous(NULL, page, 1 << order))
> > > -               __free_pages(page, order);
> > > +       __free_pages(page, order);
> > >  out:
> > >         return ret;
> > >  }
> > > --
> > > 2.27.0
> > >
>
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iommu mailing list
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^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-21  8:54     ` Amit Pundir
@ 2020-07-21 11:15       ` Nicolas Saenz Julienne
  2020-07-21 11:28         ` Christoph Hellwig
  2020-07-21 12:15         ` Amit Pundir
  0 siblings, 2 replies; 28+ messages in thread
From: Nicolas Saenz Julienne @ 2020-07-21 11:15 UTC (permalink / raw)
  To: Amit Pundir
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

On Tue, 2020-07-21 at 14:24 +0530, Amit Pundir wrote:
> On Tue, 21 Jul 2020 at 14:09, Nicolas Saenz Julienne
> <nsaenzjulienne@suse.de> wrote:
> > Hi Amit,
> > > Hi Nicolas,
> > > 
> > > I see a boot regression with this commit d9765e41d8e9 "dma-pool:
> > > Do not allocate pool memory from CMA" on my Xiaomi Poco F1
> > > (Qcom sdm845) phone running v5.8-rc6. I can't boot past the
> > > bootloader splash screen with this patch.
> > > 
> > > Phone boots fine if I revert this patch. I carry only one out of
> > > tree
> > > dts patch https://lkml.org/lkml/2020/6/25/52. And since this is a
> > > stock
> > > phone, I don't have access to serial/dmesg logs until I boot to
> > > AOSP
> > > (adb) shell.
> > > 
> > > Any thoughts as to what might be going wrong here? I'd be happy
> > > to
> > > help debug things. For what it's worth, I don't see this
> > > regression
> > > on
> > > other two sdm845 devices (db845c and Pixel 3) I tested on.
> > 
> > Can you provide a boot log (even if without my patch) and the
> > device-
> > tree files? It'd help a lot figuring things out.
> 
> Thank you for the prompt reply Nicolas.
> 
> Here is the boot log with the reverted patch
> https://pastebin.ubuntu.com/p/BrhPf83nKF/
> 
> Here is my phone's dts
> https://github.com/pundiramit/linux/commit/2a394c199deeaf4c91e0e008e8fba2a72f494d8c

I'm at loss at what could be failing here. Your device should be able
to address the whole 8GB memory space, which AFAIK is the max available
on that smartphone family. But maybe the device-tree is lying, who
knows...

Can you try booting *without* my patch and this in the kernel command
line: "cma=16M@0x100000000-0x200000000".

Regards,
Nicolas

And here is my kernel tree just in case
> https://github.com/pundiramit/linux/commits/beryllium-mainline
> 
> Regards,
> Amit Pundir
> 
> 
> > Regards,
> > Nicolas
> > 
> > > Regards,
> > > Amit Pundir
> > > 
> > > > Reported-by: Jeremy Linton <jeremy.linton@arm.com>
> > > > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> > > > ---
> > > > 
> > > > An more costly alternative would be adding an option to
> > > > dma_alloc_from_contiguous() so it fails when the allocation
> > > > doesn't
> > > > fall
> > > > in a specific zone.
> > > > 
> > > >  kernel/dma/pool.c | 11 ++---------

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-21 11:15       ` Nicolas Saenz Julienne
@ 2020-07-21 11:28         ` Christoph Hellwig
  2020-07-21 11:37           ` Nicolas Saenz Julienne
  2020-07-21 12:15         ` Amit Pundir
  1 sibling, 1 reply; 28+ messages in thread
From: Christoph Hellwig @ 2020-07-21 11:28 UTC (permalink / raw)
  To: Nicolas Saenz Julienne
  Cc: Amit Pundir, lkml, jeremy.linton, Sumit Semwal, iommu,
	John Stultz, linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

On Tue, Jul 21, 2020 at 01:15:23PM +0200, Nicolas Saenz Julienne wrote:
> I'm at loss at what could be failing here. Your device should be able
> to address the whole 8GB memory space, which AFAIK is the max available
> on that smartphone family. But maybe the device-tree is lying, who
> knows...

Maybe we should give your patch to allocate from CMA but check the
address a try?  (just because we can..)
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-21 11:28         ` Christoph Hellwig
@ 2020-07-21 11:37           ` Nicolas Saenz Julienne
  2020-07-21 12:16             ` Amit Pundir
  0 siblings, 1 reply; 28+ messages in thread
From: Nicolas Saenz Julienne @ 2020-07-21 11:37 UTC (permalink / raw)
  To: Christoph Hellwig, Amit Pundir
  Cc: lkml, jeremy.linton, iommu, John Stultz, linux-rpi-kernel,
	David Rientjes, Robin Murphy, Sumit Semwal

On Tue, 2020-07-21 at 13:28 +0200, Christoph Hellwig wrote:
> On Tue, Jul 21, 2020 at 01:15:23PM +0200, Nicolas Saenz Julienne
> wrote:
> > I'm at loss at what could be failing here. Your device should be
> > able
> > to address the whole 8GB memory space, which AFAIK is the max
> > available
> > on that smartphone family. But maybe the device-tree is lying, who
> > knows...
> 
> Maybe we should give your patch to allocate from CMA but check the
> address a try?  (just because we can..)

Yes, good idea!

Amir, could you also test this patch[1] (having reverted the one that
casues trouble) and report on whether it boots or not?

Regards,
Nicolas

[1] https://lore.kernel.org/linux-iomhttps://lore.kernel.org/linux-iom
mu/fe14037b02fd887a73cd91c115dccc4485f8446e.camel@suse.de/T/#t


_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-21 11:15       ` Nicolas Saenz Julienne
  2020-07-21 11:28         ` Christoph Hellwig
@ 2020-07-21 12:15         ` Amit Pundir
  2020-07-21 12:45           ` Nicolas Saenz Julienne
  1 sibling, 1 reply; 28+ messages in thread
From: Amit Pundir @ 2020-07-21 12:15 UTC (permalink / raw)
  To: Nicolas Saenz Julienne
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

On Tue, 21 Jul 2020 at 16:45, Nicolas Saenz Julienne
<nsaenzjulienne@suse.de> wrote:
>
> On Tue, 2020-07-21 at 14:24 +0530, Amit Pundir wrote:
> > On Tue, 21 Jul 2020 at 14:09, Nicolas Saenz Julienne
> > <nsaenzjulienne@suse.de> wrote:
> > > Hi Amit,
> > > > Hi Nicolas,
> > > >
> > > > I see a boot regression with this commit d9765e41d8e9 "dma-pool:
> > > > Do not allocate pool memory from CMA" on my Xiaomi Poco F1
> > > > (Qcom sdm845) phone running v5.8-rc6. I can't boot past the
> > > > bootloader splash screen with this patch.
> > > >
> > > > Phone boots fine if I revert this patch. I carry only one out of
> > > > tree
> > > > dts patch https://lkml.org/lkml/2020/6/25/52. And since this is a
> > > > stock
> > > > phone, I don't have access to serial/dmesg logs until I boot to
> > > > AOSP
> > > > (adb) shell.
> > > >
> > > > Any thoughts as to what might be going wrong here? I'd be happy
> > > > to
> > > > help debug things. For what it's worth, I don't see this
> > > > regression
> > > > on
> > > > other two sdm845 devices (db845c and Pixel 3) I tested on.
> > >
> > > Can you provide a boot log (even if without my patch) and the
> > > device-
> > > tree files? It'd help a lot figuring things out.
> >
> > Thank you for the prompt reply Nicolas.
> >
> > Here is the boot log with the reverted patch
> > https://pastebin.ubuntu.com/p/BrhPf83nKF/
> >
> > Here is my phone's dts
> > https://github.com/pundiramit/linux/commit/2a394c199deeaf4c91e0e008e8fba2a72f494d8c
>
> I'm at loss at what could be failing here. Your device should be able
> to address the whole 8GB memory space, which AFAIK is the max available
> on that smartphone family. But maybe the device-tree is lying, who
> knows...

If it helps, my phone has 6GB memory space.

>
> Can you try booting *without* my patch and this in the kernel command
> line: "cma=16M@0x100000000-0x200000000".

It doesn't boot with this added kernel command line.

Regards,
Amit Pundir

>
> Regards,
> Nicolas
>
> And here is my kernel tree just in case
> > https://github.com/pundiramit/linux/commits/beryllium-mainline
> >
> > Regards,
> > Amit Pundir
> >
> >
> > > Regards,
> > > Nicolas
> > >
> > > > Regards,
> > > > Amit Pundir
> > > >
> > > > > Reported-by: Jeremy Linton <jeremy.linton@arm.com>
> > > > > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> > > > > ---
> > > > >
> > > > > An more costly alternative would be adding an option to
> > > > > dma_alloc_from_contiguous() so it fails when the allocation
> > > > > doesn't
> > > > > fall
> > > > > in a specific zone.
> > > > >
> > > > >  kernel/dma/pool.c | 11 ++---------
>
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-21 11:37           ` Nicolas Saenz Julienne
@ 2020-07-21 12:16             ` Amit Pundir
  0 siblings, 0 replies; 28+ messages in thread
From: Amit Pundir @ 2020-07-21 12:16 UTC (permalink / raw)
  To: Nicolas Saenz Julienne
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

On Tue, 21 Jul 2020 at 17:07, Nicolas Saenz Julienne
<nsaenzjulienne@suse.de> wrote:
>
> On Tue, 2020-07-21 at 13:28 +0200, Christoph Hellwig wrote:
> > On Tue, Jul 21, 2020 at 01:15:23PM +0200, Nicolas Saenz Julienne
> > wrote:
> > > I'm at loss at what could be failing here. Your device should be
> > > able
> > > to address the whole 8GB memory space, which AFAIK is the max
> > > available
> > > on that smartphone family. But maybe the device-tree is lying, who
> > > knows...
> >
> > Maybe we should give your patch to allocate from CMA but check the
> > address a try?  (just because we can..)
>
> Yes, good idea!
>
> Amir, could you also test this patch[1] (having reverted the one that
> casues trouble) and report on whether it boots or not?

Can't boot with that patch either.

Regards,
Amit Pundir


>
> Regards,
> Nicolas
>
> [1] https://lore.kernel.org/linux-iomhttps://lore.kernel.org/linux-iom
> mu/fe14037b02fd887a73cd91c115dccc4485f8446e.camel@suse.de/T/#t
>
>
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-21 12:15         ` Amit Pundir
@ 2020-07-21 12:45           ` Nicolas Saenz Julienne
  2020-07-21 15:22             ` Amit Pundir
  0 siblings, 1 reply; 28+ messages in thread
From: Nicolas Saenz Julienne @ 2020-07-21 12:45 UTC (permalink / raw)
  To: Amit Pundir
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

On Tue, 2020-07-21 at 17:45 +0530, Amit Pundir wrote:
> On Tue, 21 Jul 2020 at 16:45, Nicolas Saenz Julienne
> <nsaenzjulienne@suse.de> wrote:
> > On Tue, 2020-07-21 at 14:24 +0530, Amit Pundir wrote:
> > > On Tue, 21 Jul 2020 at 14:09, Nicolas Saenz Julienne
> > > <nsaenzjulienne@suse.de> wrote:
> > > > Hi Amit,
> > > > > Hi Nicolas,
> > > > > 
> > > > > I see a boot regression with this commit d9765e41d8e9 "dma-
> > > > > pool:
> > > > > Do not allocate pool memory from CMA" on my Xiaomi Poco F1
> > > > > (Qcom sdm845) phone running v5.8-rc6. I can't boot past the
> > > > > bootloader splash screen with this patch.
> > > > > 
> > > > > Phone boots fine if I revert this patch. I carry only one out
> > > > > of
> > > > > tree
> > > > > dts patch https://lkml.org/lkml/2020/6/25/52. And since this
> > > > > is a
> > > > > stock
> > > > > phone, I don't have access to serial/dmesg logs until I boot
> > > > > to
> > > > > AOSP
> > > > > (adb) shell.
> > > > > 
> > > > > Any thoughts as to what might be going wrong here? I'd be
> > > > > happy
> > > > > to
> > > > > help debug things. For what it's worth, I don't see this
> > > > > regression
> > > > > on
> > > > > other two sdm845 devices (db845c and Pixel 3) I tested on.
> > > > 
> > > > Can you provide a boot log (even if without my patch) and the
> > > > device-
> > > > tree files? It'd help a lot figuring things out.
> > > 
> > > Thank you for the prompt reply Nicolas.
> > > 
> > > Here is the boot log with the reverted patch
> > > https://pastebin.ubuntu.com/p/BrhPf83nKF/
> > > 
> > > Here is my phone's dts
> > > https://github.com/pundiramit/linux/commit/2a394c199deeaf4c91e0e008e8fba2a72f494d8c
> > 
> > I'm at loss at what could be failing here. Your device should be
> > able
> > to address the whole 8GB memory space, which AFAIK is the max
> > available
> > on that smartphone family. But maybe the device-tree is lying, who
> > knows...
> 
> If it helps, my phone has 6GB memory space.
> 
> > Can you try booting *without* my patch and this in the kernel
> > command
> > line: "cma=16M@0x100000000-0x200000000".
> 
> It doesn't boot with this added kernel command line.


For the record, this placed the CMA in the [4GB, 8GB] address space
instead of you setup's default: [3GB, 4GB]. All atomic pools fall in
that memory area without my patch, which makes me think some of the
devices on your board might not like higher addresses.

What happens if you boot with my troublesome patch with this in your
device tree? (insert it at the bottom of sdm845-beryllium.dts)

&soc {
	dma-ranges = <0 0 0 0 0x1 0>;
};

Regards,
Nicolas

> Regards,
> Amit Pundir
> 
> > Regards,
> > Nicolas
> > 
> > And here is my kernel tree just in case
> > > https://github.com/pundiramit/linux/commits/beryllium-mainline
> > > 
> > > Regards,
> > > Amit Pundir
> > > 
> > > 
> > > > Regards,
> > > > Nicolas
> > > > 
> > > > > Regards,
> > > > > Amit Pundir
> > > > > 
> > > > > > Reported-by: Jeremy Linton <jeremy.linton@arm.com>
> > > > > > Signed-off-by: Nicolas Saenz Julienne <
> > > > > > nsaenzjulienne@suse.de>
> > > > > > ---
> > > > > > 
> > > > > > An more costly alternative would be adding an option to
> > > > > > dma_alloc_from_contiguous() so it fails when the allocation
> > > > > > doesn't
> > > > > > fall
> > > > > > in a specific zone.
> > > > > > 
> > > > > >  kernel/dma/pool.c | 11 ++---------

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-21 12:45           ` Nicolas Saenz Julienne
@ 2020-07-21 15:22             ` Amit Pundir
  2020-07-21 16:27               ` Nicolas Saenz Julienne
  0 siblings, 1 reply; 28+ messages in thread
From: Amit Pundir @ 2020-07-21 15:22 UTC (permalink / raw)
  To: Nicolas Saenz Julienne
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

On Tue, 21 Jul 2020 at 18:15, Nicolas Saenz Julienne
<nsaenzjulienne@suse.de> wrote:
>
> On Tue, 2020-07-21 at 17:45 +0530, Amit Pundir wrote:
> > On Tue, 21 Jul 2020 at 16:45, Nicolas Saenz Julienne
> > <nsaenzjulienne@suse.de> wrote:
> > > On Tue, 2020-07-21 at 14:24 +0530, Amit Pundir wrote:
> > > > On Tue, 21 Jul 2020 at 14:09, Nicolas Saenz Julienne
> > > > <nsaenzjulienne@suse.de> wrote:
> > > > > Hi Amit,
> > > > > > Hi Nicolas,
> > > > > >
> > > > > > I see a boot regression with this commit d9765e41d8e9 "dma-
> > > > > > pool:
> > > > > > Do not allocate pool memory from CMA" on my Xiaomi Poco F1
> > > > > > (Qcom sdm845) phone running v5.8-rc6. I can't boot past the
> > > > > > bootloader splash screen with this patch.
> > > > > >
> > > > > > Phone boots fine if I revert this patch. I carry only one out
> > > > > > of
> > > > > > tree
> > > > > > dts patch https://lkml.org/lkml/2020/6/25/52. And since this
> > > > > > is a
> > > > > > stock
> > > > > > phone, I don't have access to serial/dmesg logs until I boot
> > > > > > to
> > > > > > AOSP
> > > > > > (adb) shell.
> > > > > >
> > > > > > Any thoughts as to what might be going wrong here? I'd be
> > > > > > happy
> > > > > > to
> > > > > > help debug things. For what it's worth, I don't see this
> > > > > > regression
> > > > > > on
> > > > > > other two sdm845 devices (db845c and Pixel 3) I tested on.
> > > > >
> > > > > Can you provide a boot log (even if without my patch) and the
> > > > > device-
> > > > > tree files? It'd help a lot figuring things out.
> > > >
> > > > Thank you for the prompt reply Nicolas.
> > > >
> > > > Here is the boot log with the reverted patch
> > > > https://pastebin.ubuntu.com/p/BrhPf83nKF/
> > > >
> > > > Here is my phone's dts
> > > > https://github.com/pundiramit/linux/commit/2a394c199deeaf4c91e0e008e8fba2a72f494d8c
> > >
> > > I'm at loss at what could be failing here. Your device should be
> > > able
> > > to address the whole 8GB memory space, which AFAIK is the max
> > > available
> > > on that smartphone family. But maybe the device-tree is lying, who
> > > knows...
> >
> > If it helps, my phone has 6GB memory space.
> >
> > > Can you try booting *without* my patch and this in the kernel
> > > command
> > > line: "cma=16M@0x100000000-0x200000000".
> >
> > It doesn't boot with this added kernel command line.
>
>
> For the record, this placed the CMA in the [4GB, 8GB] address space
> instead of you setup's default: [3GB, 4GB]. All atomic pools fall in
> that memory area without my patch, which makes me think some of the
> devices on your board might not like higher addresses.
>

Thank you Nicolas for the details. Though we don't set the CMA
alloc-ranges explicitly in upstream sdm845 dts, but I dug around and
found that CMA alloc-ranges in the downstream kernel are indeed in
lower address space.
https://github.com/MiCode/Xiaomi_Kernel_OpenSource/blob/dipper-q-oss/arch/arm64/boot/dts/qcom/sdm845.dtsi#L662

/* global autoconfigured region for contiguous allocations */
linux,cma {
        compatible = "shared-dma-pool";
        alloc-ranges = <0 0x00000000 0 0xffffffff>;
        reusable;
        alignment = <0 0x400000>;
        size = <0 0x2000000>;
        linux,cma-default;
};

> What happens if you boot with my troublesome patch with this in your
> device tree? (insert it at the bottom of sdm845-beryllium.dts)
>
> &soc {
>         dma-ranges = <0 0 0 0 0x1 0>;
> };
>

Device still doesn't boot up to adb shell.

Regards,
Amit Pundir

> Regards,
> Nicolas
>
> > Regards,
> > Amit Pundir
> >
> > > Regards,
> > > Nicolas
> > >
> > > And here is my kernel tree just in case
> > > > https://github.com/pundiramit/linux/commits/beryllium-mainline
> > > >
> > > > Regards,
> > > > Amit Pundir
> > > >
> > > >
> > > > > Regards,
> > > > > Nicolas
> > > > >
> > > > > > Regards,
> > > > > > Amit Pundir
> > > > > >
> > > > > > > Reported-by: Jeremy Linton <jeremy.linton@arm.com>
> > > > > > > Signed-off-by: Nicolas Saenz Julienne <
> > > > > > > nsaenzjulienne@suse.de>
> > > > > > > ---
> > > > > > >
> > > > > > > An more costly alternative would be adding an option to
> > > > > > > dma_alloc_from_contiguous() so it fails when the allocation
> > > > > > > doesn't
> > > > > > > fall
> > > > > > > in a specific zone.
> > > > > > >
> > > > > > >  kernel/dma/pool.c | 11 ++---------
>
_______________________________________________
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^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-21 15:22             ` Amit Pundir
@ 2020-07-21 16:27               ` Nicolas Saenz Julienne
  2020-07-23  5:14                 ` Amit Pundir
  0 siblings, 1 reply; 28+ messages in thread
From: Nicolas Saenz Julienne @ 2020-07-21 16:27 UTC (permalink / raw)
  To: Amit Pundir
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

On Tue, 2020-07-21 at 20:52 +0530, Amit Pundir wrote:

[...]

> > > > Can you try booting *without* my patch and this in the kernel
> > > > command
> > > > line: "cma=16M@0x100000000-0x200000000".
> > > 
> > > It doesn't boot with this added kernel command line.
> > 
> > For the record, this placed the CMA in the [4GB, 8GB] address space
> > instead of you setup's default: [3GB, 4GB]. All atomic pools fall
> > in
> > that memory area without my patch, which makes me think some of the
> > devices on your board might not like higher addresses.
> > 
> 
> Thank you Nicolas for the details. Though we don't set the CMA
> alloc-ranges explicitly in upstream sdm845 dts, but I dug around and
> found that CMA alloc-ranges in the downstream kernel are indeed in
> lower address space.
> https://github.com/MiCode/Xiaomi_Kernel_OpenSource/blob/dipper-q-oss/arch/arm64/boot/dts/qcom/sdm845.dtsi#L662
> 
> /* global autoconfigured region for contiguous allocations */
> linux,cma {
>         compatible = "shared-dma-pool";
>         alloc-ranges = <0 0x00000000 0 0xffffffff>;
>         reusable;
>         alignment = <0 0x400000>;
>         size = <0 0x2000000>;
>         linux,cma-default;
> };

Pretty standard, and similar to what it's being used upstream by
default.

> 
> > What happens if you boot with my troublesome patch with this in
> > your
> > device tree? (insert it at the bottom of sdm845-beryllium.dts)
> > 
> > &soc {
> >         dma-ranges = <0 0 0 0 0x1 0>;
> > };
> > 
> 
> Device still doesn't boot up to adb shell.

Let's get a bigger hammer, I'm just looking for clues here. Can you
apply this and provide the dmesg output.

diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
index 6bc74a2d5127..2160676bf488 100644
--- a/kernel/dma/pool.c
+++ b/kernel/dma/pool.c
@@ -268,6 +268,8 @@ void *dma_alloc_from_pool(struct device *dev, size_t size,
                        schedule_work(&atomic_pool_work);
        }
 
+       dev_info(dev, "%s: size %lx, phys addr %llx, flags 0x%x\n", __func__, size, phys, flags);
+
        return ptr;
 }
  

Regards,
Nicolas

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^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-21 16:27               ` Nicolas Saenz Julienne
@ 2020-07-23  5:14                 ` Amit Pundir
  2020-07-24  9:36                   ` Nicolas Saenz Julienne
  0 siblings, 1 reply; 28+ messages in thread
From: Amit Pundir @ 2020-07-23  5:14 UTC (permalink / raw)
  To: Nicolas Saenz Julienne
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

Hi Nicolas,

Sorry I got stuck on other things yesterday.

On Tue, 21 Jul 2020 at 21:57, Nicolas Saenz Julienne
<nsaenzjulienne@suse.de> wrote:
>
> On Tue, 2020-07-21 at 20:52 +0530, Amit Pundir wrote:
>
> [...]
>
> > > > > Can you try booting *without* my patch and this in the kernel
> > > > > command
> > > > > line: "cma=16M@0x100000000-0x200000000".
> > > >
> > > > It doesn't boot with this added kernel command line.
> > >
> > > For the record, this placed the CMA in the [4GB, 8GB] address space
> > > instead of you setup's default: [3GB, 4GB]. All atomic pools fall
> > > in
> > > that memory area without my patch, which makes me think some of the
> > > devices on your board might not like higher addresses.
> > >
> >
> > Thank you Nicolas for the details. Though we don't set the CMA
> > alloc-ranges explicitly in upstream sdm845 dts, but I dug around and
> > found that CMA alloc-ranges in the downstream kernel are indeed in
> > lower address space.
> > https://github.com/MiCode/Xiaomi_Kernel_OpenSource/blob/dipper-q-oss/arch/arm64/boot/dts/qcom/sdm845.dtsi#L662
> >
> > /* global autoconfigured region for contiguous allocations */
> > linux,cma {
> >         compatible = "shared-dma-pool";
> >         alloc-ranges = <0 0x00000000 0 0xffffffff>;
> >         reusable;
> >         alignment = <0 0x400000>;
> >         size = <0 0x2000000>;
> >         linux,cma-default;
> > };
>
> Pretty standard, and similar to what it's being used upstream by
> default.
>
> >
> > > What happens if you boot with my troublesome patch with this in
> > > your
> > > device tree? (insert it at the bottom of sdm845-beryllium.dts)
> > >
> > > &soc {
> > >         dma-ranges = <0 0 0 0 0x1 0>;
> > > };
> > >
> >
> > Device still doesn't boot up to adb shell.
>
> Let's get a bigger hammer, I'm just looking for clues here. Can you
> apply this and provide the dmesg output.
>
> diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> index 6bc74a2d5127..2160676bf488 100644
> --- a/kernel/dma/pool.c
> +++ b/kernel/dma/pool.c
> @@ -268,6 +268,8 @@ void *dma_alloc_from_pool(struct device *dev, size_t size,
>                         schedule_work(&atomic_pool_work);
>         }
>
> +       dev_info(dev, "%s: size %lx, phys addr %llx, flags 0x%x\n", __func__, size, phys, flags);
> +
>         return ptr;
>  }

I never made it to dma_alloc_from_pool() call from
dma_direct_alloc_pages(), dma_should_alloc_from_pool() returns False
from gfpflags_allow_blocking() block.


Regards,
Amit Pundir

>
>
> Regards,
> Nicolas
>
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^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-23  5:14                 ` Amit Pundir
@ 2020-07-24  9:36                   ` Nicolas Saenz Julienne
  2020-07-24 11:06                     ` Amit Pundir
  0 siblings, 1 reply; 28+ messages in thread
From: Nicolas Saenz Julienne @ 2020-07-24  9:36 UTC (permalink / raw)
  To: Amit Pundir
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

Hi Amit,

On Thu, 2020-07-23 at 10:44 +0530, Amit Pundir wrote:
> Hi Nicolas,
> 
> Sorry I got stuck on other things yesterday.

No worries :)

> On Tue, 21 Jul 2020 at 21:57, Nicolas Saenz Julienne

[...]

> > 
> > Let's get a bigger hammer, I'm just looking for clues here. Can you
> > apply this and provide the dmesg output.
> > 
> > diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> > index 6bc74a2d5127..2160676bf488 100644
> > --- a/kernel/dma/pool.c
> > +++ b/kernel/dma/pool.c
> > @@ -268,6 +268,8 @@ void *dma_alloc_from_pool(struct device *dev, size_t size,
> >                         schedule_work(&atomic_pool_work);
> >         }
> > 
> > +       dev_info(dev, "%s: size %lx, phys addr %llx, flags 0x%x\n", __func__, size, phys, flags);
> > +
> >         return ptr;
> >  }
> 
> I never made it to dma_alloc_from_pool() call from
> dma_direct_alloc_pages(), dma_should_alloc_from_pool() returns False
> from gfpflags_allow_blocking() block.

I'm a little sceptical about this. The only way you can get memory from these
pools is through dma_alloc_from_pool(), and given how changes in the pool
initialization affected the phone, it's pretty clear some amount of pool
allocation is happening.

Regards,
Nicolas

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^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-24  9:36                   ` Nicolas Saenz Julienne
@ 2020-07-24 11:06                     ` Amit Pundir
  2020-07-24 13:41                       ` Christoph Hellwig
  0 siblings, 1 reply; 28+ messages in thread
From: Amit Pundir @ 2020-07-24 11:06 UTC (permalink / raw)
  To: Nicolas Saenz Julienne
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

On Fri, 24 Jul 2020 at 15:06, Nicolas Saenz Julienne
<nsaenzjulienne@suse.de> wrote:
>
> Hi Amit,
>
> On Thu, 2020-07-23 at 10:44 +0530, Amit Pundir wrote:
> > Hi Nicolas,
> >
> > Sorry I got stuck on other things yesterday.
>
> No worries :)
>
> > On Tue, 21 Jul 2020 at 21:57, Nicolas Saenz Julienne
>
> [...]
>
> > >
> > > Let's get a bigger hammer, I'm just looking for clues here. Can you
> > > apply this and provide the dmesg output.
> > >
> > > diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> > > index 6bc74a2d5127..2160676bf488 100644
> > > --- a/kernel/dma/pool.c
> > > +++ b/kernel/dma/pool.c
> > > @@ -268,6 +268,8 @@ void *dma_alloc_from_pool(struct device *dev, size_t size,
> > >                         schedule_work(&atomic_pool_work);
> > >         }
> > >
> > > +       dev_info(dev, "%s: size %lx, phys addr %llx, flags 0x%x\n", __func__, size, phys, flags);
> > > +
> > >         return ptr;
> > >  }
> >
> > I never made it to dma_alloc_from_pool() call from
> > dma_direct_alloc_pages(), dma_should_alloc_from_pool() returns False
> > from gfpflags_allow_blocking() block.
>
> I'm a little sceptical about this. The only way you can get memory from these
> pools is through dma_alloc_from_pool(), and given how changes in the pool
> initialization affected the phone, it's pretty clear some amount of pool
> allocation is happening.

Maybe from here iommu_dma_alloc_remap()?

I see two paths to dma_alloc_from_pool(), one from
dma_direct_alloc_pages() which I mentioned above and
2nd one is thru iommu_dma_alloc(), but the flow doesn't
reach up to dma_alloc_from_pool(), and always returns
from iommu_dma_alloc_remap().


Regards,
Amit Pundir

>
> Regards,
> Nicolas
>
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^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-24 11:06                     ` Amit Pundir
@ 2020-07-24 13:41                       ` Christoph Hellwig
  2020-07-24 16:19                         ` Amit Pundir
  2020-07-27 17:56                         ` Nicolas Saenz Julienne
  0 siblings, 2 replies; 28+ messages in thread
From: Christoph Hellwig @ 2020-07-24 13:41 UTC (permalink / raw)
  To: Amit Pundir
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

Yes, the iommu is an interesting case, and the current code is
wrong for that.  Can you try the patch below?  It contains a modified
version of Nicolas' patch to try CMA again for the expansion and a new
(for now hackish) way to not apply the addressability check for dma-iommu
allocations.

diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
index 6bc74a2d51273e..ec5e525d2b9309 100644
--- a/kernel/dma/pool.c
+++ b/kernel/dma/pool.c
@@ -3,7 +3,9 @@
  * Copyright (C) 2012 ARM Ltd.
  * Copyright (C) 2020 Google LLC
  */
+#include <linux/cma.h>
 #include <linux/debugfs.h>
+#include <linux/dma-contiguous.h>
 #include <linux/dma-direct.h>
 #include <linux/dma-noncoherent.h>
 #include <linux/init.h>
@@ -55,6 +57,31 @@ static void dma_atomic_pool_size_add(gfp_t gfp, size_t size)
 		pool_size_kernel += size;
 }
 
+static bool cma_in_zone(gfp_t gfp)
+{
+	phys_addr_t end;
+	unsigned long size;
+	struct cma *cma;
+
+	cma = dev_get_cma_area(NULL);
+	if (!cma)
+		return false;
+
+	size = cma_get_size(cma);
+	if (!size)
+		return false;
+	end = cma_get_base(cma) - memblock_start_of_DRAM() + size - 1;
+
+	/* CMA can't cross zone boundaries, see cma_activate_area() */
+	if (IS_ENABLED(CONFIG_ZONE_DMA) && (gfp & GFP_DMA) &&
+	    end <= DMA_BIT_MASK(zone_dma_bits))
+		return true;
+	if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp & GFP_DMA32) &&
+	    end <= DMA_BIT_MASK(32))
+		return true;
+	return true;
+}
+
 static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
 			      gfp_t gfp)
 {
@@ -68,7 +95,11 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
 
 	do {
 		pool_size = 1 << (PAGE_SHIFT + order);
-		page = alloc_pages(gfp, order);
+		if (cma_in_zone(gfp))
+ 			page = dma_alloc_from_contiguous(NULL, 1 << order,
+ 							 order, false);
+		if (!page)
+			page = alloc_pages(gfp, order);
 	} while (!page && order-- > 0);
 	if (!page)
 		goto out;
@@ -251,7 +282,11 @@ void *dma_alloc_from_pool(struct device *dev, size_t size,
 			continue;
 
 		phys = gen_pool_virt_to_phys(pool, val);
-		if (dma_coherent_ok(dev, phys, size))
+		/*
+		 * Only apply the addressability check for dma-direct.
+		 * This is a nasty hack and won't work e.g. for arm.
+		 */
+		if (get_dma_ops(dev) || dma_coherent_ok(dev, phys, size))
 			break;
 
 		gen_pool_free(pool, val, size);
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^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-24 13:41                       ` Christoph Hellwig
@ 2020-07-24 16:19                         ` Amit Pundir
  2020-07-24 16:27                           ` Christoph Hellwig
  2020-07-27 17:56                         ` Nicolas Saenz Julienne
  1 sibling, 1 reply; 28+ messages in thread
From: Amit Pundir @ 2020-07-24 16:19 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: lkml, jeremy.linton, iommu, John Stultz, linux-rpi-kernel,
	David Rientjes, Robin Murphy, Sumit Semwal

On Fri, 24 Jul 2020 at 19:11, Christoph Hellwig <hch@lst.de> wrote:
>
> Yes, the iommu is an interesting case, and the current code is
> wrong for that.  Can you try the patch below?  It contains a modified
> version of Nicolas' patch to try CMA again for the expansion and a new
> (for now hackish) way to not apply the addressability check for dma-iommu
> allocations.

Thank you. The below patch worked on today's linux/master (f37e99aca03f).

Regards,
Amit Pundir

>
> diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> index 6bc74a2d51273e..ec5e525d2b9309 100644
> --- a/kernel/dma/pool.c
> +++ b/kernel/dma/pool.c
> @@ -3,7 +3,9 @@
>   * Copyright (C) 2012 ARM Ltd.
>   * Copyright (C) 2020 Google LLC
>   */
> +#include <linux/cma.h>
>  #include <linux/debugfs.h>
> +#include <linux/dma-contiguous.h>
>  #include <linux/dma-direct.h>
>  #include <linux/dma-noncoherent.h>
>  #include <linux/init.h>
> @@ -55,6 +57,31 @@ static void dma_atomic_pool_size_add(gfp_t gfp, size_t size)
>                 pool_size_kernel += size;
>  }
>
> +static bool cma_in_zone(gfp_t gfp)
> +{
> +       phys_addr_t end;
> +       unsigned long size;
> +       struct cma *cma;
> +
> +       cma = dev_get_cma_area(NULL);
> +       if (!cma)
> +               return false;
> +
> +       size = cma_get_size(cma);
> +       if (!size)
> +               return false;
> +       end = cma_get_base(cma) - memblock_start_of_DRAM() + size - 1;
> +
> +       /* CMA can't cross zone boundaries, see cma_activate_area() */
> +       if (IS_ENABLED(CONFIG_ZONE_DMA) && (gfp & GFP_DMA) &&
> +           end <= DMA_BIT_MASK(zone_dma_bits))
> +               return true;
> +       if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp & GFP_DMA32) &&
> +           end <= DMA_BIT_MASK(32))
> +               return true;
> +       return true;
> +}
> +
>  static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
>                               gfp_t gfp)
>  {
> @@ -68,7 +95,11 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
>
>         do {
>                 pool_size = 1 << (PAGE_SHIFT + order);
> -               page = alloc_pages(gfp, order);
> +               if (cma_in_zone(gfp))
> +                       page = dma_alloc_from_contiguous(NULL, 1 << order,
> +                                                        order, false);
> +               if (!page)
> +                       page = alloc_pages(gfp, order);
>         } while (!page && order-- > 0);
>         if (!page)
>                 goto out;
> @@ -251,7 +282,11 @@ void *dma_alloc_from_pool(struct device *dev, size_t size,
>                         continue;
>
>                 phys = gen_pool_virt_to_phys(pool, val);
> -               if (dma_coherent_ok(dev, phys, size))
> +               /*
> +                * Only apply the addressability check for dma-direct.
> +                * This is a nasty hack and won't work e.g. for arm.
> +                */
> +               if (get_dma_ops(dev) || dma_coherent_ok(dev, phys, size))
>                         break;
>
>                 gen_pool_free(pool, val, size);
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^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-24 16:19                         ` Amit Pundir
@ 2020-07-24 16:27                           ` Christoph Hellwig
  0 siblings, 0 replies; 28+ messages in thread
From: Christoph Hellwig @ 2020-07-24 16:27 UTC (permalink / raw)
  To: Amit Pundir
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

On Fri, Jul 24, 2020 at 09:49:17PM +0530, Amit Pundir wrote:
> On Fri, 24 Jul 2020 at 19:11, Christoph Hellwig <hch@lst.de> wrote:
> >
> > Yes, the iommu is an interesting case, and the current code is
> > wrong for that.  Can you try the patch below?  It contains a modified
> > version of Nicolas' patch to try CMA again for the expansion and a new
> > (for now hackish) way to not apply the addressability check for dma-iommu
> > allocations.
> 
> Thank you. The below patch worked on today's linux/master (f37e99aca03f).

Ok, I'll try to massage it into a few cleaner patches over the weekend
and will send them to you again for retesting.

Thanks a lot for your patience!
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^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-24 13:41                       ` Christoph Hellwig
  2020-07-24 16:19                         ` Amit Pundir
@ 2020-07-27 17:56                         ` Nicolas Saenz Julienne
  2020-07-28  9:13                           ` Christoph Hellwig
  1 sibling, 1 reply; 28+ messages in thread
From: Nicolas Saenz Julienne @ 2020-07-27 17:56 UTC (permalink / raw)
  To: Christoph Hellwig, Amit Pundir
  Cc: lkml, jeremy.linton, iommu, John Stultz, linux-rpi-kernel,
	David Rientjes, Robin Murphy, Sumit Semwal

[-- Attachment #1.1: Type: text/plain, Size: 2097 bytes --]

Hi Christoph,
thanks for having a look at this!

On Fri, 2020-07-24 at 15:41 +0200, Christoph Hellwig wrote:
> Yes, the iommu is an interesting case, and the current code is
> wrong for that.

Care to expand on this? I do get that checking dma_coherent_ok() on memory
that'll later on be mapped into an iommu is kind of silly, although I think
harmless in Amir's specific case, since devices have wide enough dma-ranges. Is
there more to it?

> Can you try the patch below?  It contains a modified version of Nicolas'
> patch to try CMA again for the expansion and a new (for now hackish) way to
> not apply the addressability check for dma-iommu allocations.
> 
> diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> index 6bc74a2d51273e..ec5e525d2b9309 100644
> --- a/kernel/dma/pool.c
> +++ b/kernel/dma/pool.c
> @@ -3,7 +3,9 @@
>   * Copyright (C) 2012 ARM Ltd.
>   * Copyright (C) 2020 Google LLC
>   */
> +#include <linux/cma.h>
>  #include <linux/debugfs.h>
> +#include <linux/dma-contiguous.h>
>  #include <linux/dma-direct.h>
>  #include <linux/dma-noncoherent.h>
>  #include <linux/init.h>
> @@ -55,6 +57,31 @@ static void dma_atomic_pool_size_add(gfp_t gfp, size_t
> size)
>  		pool_size_kernel += size;
>  }
>  
> +static bool cma_in_zone(gfp_t gfp)
> +{
> +	phys_addr_t end;
> +	unsigned long size;
> +	struct cma *cma;
> +
> +	cma = dev_get_cma_area(NULL);
> +	if (!cma)
> +		return false;
> +
> +	size = cma_get_size(cma);
> +	if (!size)
> +		return false;
> +	end = cma_get_base(cma) - memblock_start_of_DRAM() + size - 1;
> +
> +	/* CMA can't cross zone boundaries, see cma_activate_area() */
> +	if (IS_ENABLED(CONFIG_ZONE_DMA) && (gfp & GFP_DMA) &&
> +	    end <= DMA_BIT_MASK(zone_dma_bits))
> +		return true;
> +	if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp & GFP_DMA32) &&
> +	    end <= DMA_BIT_MASK(32))
> +		return true;
> +	return true;

IIUC this will always return true given a CMA is present. Which reverts to the
previous behaviour (previous as in breaking some rpi4 setups), isn't it?

Regards,
Nicolas


[-- Attachment #1.2: This is a digitally signed message part --]
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[-- Attachment #2: Type: text/plain, Size: 156 bytes --]

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^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-27 17:56                         ` Nicolas Saenz Julienne
@ 2020-07-28  9:13                           ` Christoph Hellwig
  2020-07-28  9:30                             ` Nicolas Saenz Julienne
  0 siblings, 1 reply; 28+ messages in thread
From: Christoph Hellwig @ 2020-07-28  9:13 UTC (permalink / raw)
  To: Nicolas Saenz Julienne
  Cc: Amit Pundir, lkml, jeremy.linton, Sumit Semwal, iommu,
	John Stultz, linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

On Mon, Jul 27, 2020 at 07:56:56PM +0200, Nicolas Saenz Julienne wrote:
> Hi Christoph,
> thanks for having a look at this!
> 
> On Fri, 2020-07-24 at 15:41 +0200, Christoph Hellwig wrote:
> > Yes, the iommu is an interesting case, and the current code is
> > wrong for that.
> 
> Care to expand on this? I do get that checking dma_coherent_ok() on memory
> that'll later on be mapped into an iommu is kind of silly, although I think
> harmless in Amir's specific case, since devices have wide enough dma-ranges. Is
> there more to it?

I think the problem is that it can lead to not finding suitable memory.

> 
> > Can you try the patch below?  It contains a modified version of Nicolas'
> > patch to try CMA again for the expansion and a new (for now hackish) way to
> > not apply the addressability check for dma-iommu allocations.
> > 
> > diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> > index 6bc74a2d51273e..ec5e525d2b9309 100644
> > --- a/kernel/dma/pool.c
> > +++ b/kernel/dma/pool.c
> > @@ -3,7 +3,9 @@
> >   * Copyright (C) 2012 ARM Ltd.
> >   * Copyright (C) 2020 Google LLC
> >   */
> > +#include <linux/cma.h>
> >  #include <linux/debugfs.h>
> > +#include <linux/dma-contiguous.h>
> >  #include <linux/dma-direct.h>
> >  #include <linux/dma-noncoherent.h>
> >  #include <linux/init.h>
> > @@ -55,6 +57,31 @@ static void dma_atomic_pool_size_add(gfp_t gfp, size_t
> > size)
> >  		pool_size_kernel += size;
> >  }
> >  
> > +static bool cma_in_zone(gfp_t gfp)
> > +{
> > +	phys_addr_t end;
> > +	unsigned long size;
> > +	struct cma *cma;
> > +
> > +	cma = dev_get_cma_area(NULL);
> > +	if (!cma)
> > +		return false;
> > +
> > +	size = cma_get_size(cma);
> > +	if (!size)
> > +		return false;
> > +	end = cma_get_base(cma) - memblock_start_of_DRAM() + size - 1;
> > +
> > +	/* CMA can't cross zone boundaries, see cma_activate_area() */
> > +	if (IS_ENABLED(CONFIG_ZONE_DMA) && (gfp & GFP_DMA) &&
> > +	    end <= DMA_BIT_MASK(zone_dma_bits))
> > +		return true;
> > +	if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp & GFP_DMA32) &&
> > +	    end <= DMA_BIT_MASK(32))
> > +		return true;
> > +	return true;
> 
> IIUC this will always return true given a CMA is present. Which reverts to the
> previous behaviour (previous as in breaking some rpi4 setups), isn't it?

Was that really what broke the PI?  I'll try to get the split out series
today, which might have a few more tweaks, and then we'll need to test it
both on these rpi4 setups and Amits phone.
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-28  9:13                           ` Christoph Hellwig
@ 2020-07-28  9:30                             ` Nicolas Saenz Julienne
  2020-07-28 10:09                               ` Christoph Hellwig
  0 siblings, 1 reply; 28+ messages in thread
From: Nicolas Saenz Julienne @ 2020-07-28  9:30 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: Amit Pundir, lkml, jeremy.linton, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy, Sumit Semwal

[-- Attachment #1.1: Type: text/plain, Size: 3171 bytes --]

On Tue, 2020-07-28 at 11:13 +0200, Christoph Hellwig wrote:
> On Mon, Jul 27, 2020 at 07:56:56PM +0200, Nicolas Saenz Julienne wrote:
> > Hi Christoph,
> > thanks for having a look at this!
> > 
> > On Fri, 2020-07-24 at 15:41 +0200, Christoph Hellwig wrote:
> > > Yes, the iommu is an interesting case, and the current code is
> > > wrong for that.
> > 
> > Care to expand on this? I do get that checking dma_coherent_ok() on memory
> > that'll later on be mapped into an iommu is kind of silly, although I think
> > harmless in Amir's specific case, since devices have wide enough dma-
ranges. 
> > Is
> > there more to it?
> 
> I think the problem is that it can lead to not finding suitable memory.
> 
> > > Can you try the patch below?  It contains a modified version of Nicolas'
> > > patch to try CMA again for the expansion and a new (for now hackish) way
> > > to
> > > not apply the addressability check for dma-iommu allocations.
> > > 
> > > diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> > > index 6bc74a2d51273e..ec5e525d2b9309 100644
> > > --- a/kernel/dma/pool.c
> > > +++ b/kernel/dma/pool.c
> > > @@ -3,7 +3,9 @@
> > >   * Copyright (C) 2012 ARM Ltd.
> > >   * Copyright (C) 2020 Google LLC
> > >   */
> > > +#include <linux/cma.h>
> > >  #include <linux/debugfs.h>
> > > +#include <linux/dma-contiguous.h>
> > >  #include <linux/dma-direct.h>
> > >  #include <linux/dma-noncoherent.h>
> > >  #include <linux/init.h>
> > > @@ -55,6 +57,31 @@ static void dma_atomic_pool_size_add(gfp_t gfp, size_t
> > > size)
> > >  		pool_size_kernel += size;
> > >  }
> > >  
> > > +static bool cma_in_zone(gfp_t gfp)
> > > +{
> > > +	phys_addr_t end;
> > > +	unsigned long size;
> > > +	struct cma *cma;
> > > +
> > > +	cma = dev_get_cma_area(NULL);
> > > +	if (!cma)
> > > +		return false;
> > > +
> > > +	size = cma_get_size(cma);
> > > +	if (!size)
> > > +		return false;
> > > +	end = cma_get_base(cma) - memblock_start_of_DRAM() + size - 1;
> > > +
> > > +	/* CMA can't cross zone boundaries, see cma_activate_area() */
> > > +	if (IS_ENABLED(CONFIG_ZONE_DMA) && (gfp & GFP_DMA) &&
> > > +	    end <= DMA_BIT_MASK(zone_dma_bits))
> > > +		return true;
> > > +	if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp & GFP_DMA32) &&
> > > +	    end <= DMA_BIT_MASK(32))
> > > +		return true;
> > > +	return true;
> > 
> > IIUC this will always return true given a CMA is present. Which reverts to
> > the
> > previous behaviour (previous as in breaking some rpi4 setups), isn't it?
> 
> Was that really what broke the PI?  I'll try to get the split out series
> today, which might have a few more tweaks, and then we'll need to test it
> both on these rpi4 setups and Amits phone.

There was two issues with RPi:
 - Not validating that pool allocated memory was OK for the device
 - Locating all atomic pools in CMA, which doesn't work for all RPi4 devices*,
   and IMO misses the point of having multiple pools.

* With ACPI RPi4 we have CMA located in ZONE_DMA32, yet have an atomic pool
consumer, PCIe, that only wants memory in the [0 3GB] area, effectively needing
ZONE_DMA memory.


[-- Attachment #1.2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

[-- Attachment #2: Type: text/plain, Size: 156 bytes --]

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-28  9:30                             ` Nicolas Saenz Julienne
@ 2020-07-28 10:09                               ` Christoph Hellwig
  2020-07-31  1:10                                 ` Nathan Chancellor
  0 siblings, 1 reply; 28+ messages in thread
From: Christoph Hellwig @ 2020-07-28 10:09 UTC (permalink / raw)
  To: Nicolas Saenz Julienne
  Cc: Amit Pundir, lkml, jeremy.linton, Sumit Semwal, iommu,
	John Stultz, linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

On Tue, Jul 28, 2020 at 11:30:32AM +0200, Nicolas Saenz Julienne wrote:
> On Tue, 2020-07-28 at 11:13 +0200, Christoph Hellwig wrote:
> > On Mon, Jul 27, 2020 at 07:56:56PM +0200, Nicolas Saenz Julienne wrote:
> > > Hi Christoph,
> > > thanks for having a look at this!
> > > 
> > > On Fri, 2020-07-24 at 15:41 +0200, Christoph Hellwig wrote:
> > > > Yes, the iommu is an interesting case, and the current code is
> > > > wrong for that.
> > > 
> > > Care to expand on this? I do get that checking dma_coherent_ok() on memory
> > > that'll later on be mapped into an iommu is kind of silly, although I think
> > > harmless in Amir's specific case, since devices have wide enough dma-
> ranges. 
> > > Is
> > > there more to it?
> > 
> > I think the problem is that it can lead to not finding suitable memory.
> > 
> > > > Can you try the patch below?  It contains a modified version of Nicolas'
> > > > patch to try CMA again for the expansion and a new (for now hackish) way
> > > > to
> > > > not apply the addressability check for dma-iommu allocations.
> > > > 
> > > > diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> > > > index 6bc74a2d51273e..ec5e525d2b9309 100644
> > > > --- a/kernel/dma/pool.c
> > > > +++ b/kernel/dma/pool.c
> > > > @@ -3,7 +3,9 @@
> > > >   * Copyright (C) 2012 ARM Ltd.
> > > >   * Copyright (C) 2020 Google LLC
> > > >   */
> > > > +#include <linux/cma.h>
> > > >  #include <linux/debugfs.h>
> > > > +#include <linux/dma-contiguous.h>
> > > >  #include <linux/dma-direct.h>
> > > >  #include <linux/dma-noncoherent.h>
> > > >  #include <linux/init.h>
> > > > @@ -55,6 +57,31 @@ static void dma_atomic_pool_size_add(gfp_t gfp, size_t
> > > > size)
> > > >  		pool_size_kernel += size;
> > > >  }
> > > >  
> > > > +static bool cma_in_zone(gfp_t gfp)
> > > > +{
> > > > +	phys_addr_t end;
> > > > +	unsigned long size;
> > > > +	struct cma *cma;
> > > > +
> > > > +	cma = dev_get_cma_area(NULL);
> > > > +	if (!cma)
> > > > +		return false;
> > > > +
> > > > +	size = cma_get_size(cma);
> > > > +	if (!size)
> > > > +		return false;
> > > > +	end = cma_get_base(cma) - memblock_start_of_DRAM() + size - 1;
> > > > +
> > > > +	/* CMA can't cross zone boundaries, see cma_activate_area() */
> > > > +	if (IS_ENABLED(CONFIG_ZONE_DMA) && (gfp & GFP_DMA) &&
> > > > +	    end <= DMA_BIT_MASK(zone_dma_bits))
> > > > +		return true;
> > > > +	if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp & GFP_DMA32) &&
> > > > +	    end <= DMA_BIT_MASK(32))
> > > > +		return true;
> > > > +	return true;
> > > 
> > > IIUC this will always return true given a CMA is present. Which reverts to
> > > the
> > > previous behaviour (previous as in breaking some rpi4 setups), isn't it?
> > 
> > Was that really what broke the PI?  I'll try to get the split out series
> > today, which might have a few more tweaks, and then we'll need to test it
> > both on these rpi4 setups and Amits phone.
> 
> There was two issues with RPi:
>  - Not validating that pool allocated memory was OK for the device
>  - Locating all atomic pools in CMA, which doesn't work for all RPi4 devices*,
>    and IMO misses the point of having multiple pools.
> 
> * With ACPI RPi4 we have CMA located in ZONE_DMA32, yet have an atomic pool
> consumer, PCIe, that only wants memory in the [0 3GB] area, effectively needing
> ZONE_DMA memory.

Ok, I found a slight bug that wasn't intended.  I wanted to make sure
we can always fall back to a lower pool, but got that wrong.  Should be
fixed in the next version.
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-28 10:09                               ` Christoph Hellwig
@ 2020-07-31  1:10                                 ` Nathan Chancellor
  2020-07-31  7:19                                   ` Amit Pundir
  2020-07-31 10:09                                   ` Nicolas Saenz Julienne
  0 siblings, 2 replies; 28+ messages in thread
From: Nathan Chancellor @ 2020-07-31  1:10 UTC (permalink / raw)
  To: Christoph Hellwig, Nicolas Saenz Julienne
  Cc: Amit Pundir, lkml, jeremy.linton, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy, Sumit Semwal

On Tue, Jul 28, 2020 at 12:09:18PM +0200, Christoph Hellwig wrote:
> Ok, I found a slight bug that wasn't intended.  I wanted to make sure
> we can always fall back to a lower pool, but got that wrong.  Should be
> fixed in the next version.

Hi Christoph and Nicolas,

Did a version of that series ever get send out? I am coming into the
conversation late but I am running into an issue with the Raspberry Pi 4
not booting on linux-next, which appears to be due to this patch now in
mainline as commit d9765e41d8e9 ("dma-pool: do not allocate pool memory
from CMA") combined with
https://lore.kernel.org/lkml/20200725014529.1143208-2-jiaxun.yang@flygoat.com/
in -next:

[    1.423163] raspberrypi-firmware soc:firmware: Request 0x00000001 returned status 0x00000000
[    1.431883] raspberrypi-firmware soc:firmware: Request 0x00030046 returned status 0x00000000
[    1.443888] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.452527] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 0 config (-22 80)
[    1.460836] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.469445] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 1 config (-22 81)
[    1.477735] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.486350] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 2 config (-22 82)
[    1.494639] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.503246] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 3 config (-22 83)
[    1.511529] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.520131] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 4 config (-22 84)
[    1.528414] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.537017] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 5 config (-22 85)
[    1.545299] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.553903] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 6 config (-22 86)
[    1.562184] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.570787] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 7 config (-22 87)
[    1.579897] raspberrypi-firmware soc:firmware: Request 0x00030030 returned status 0x00000000
[    1.589419] raspberrypi-firmware soc:firmware: Request 0x00028001 returned status 0x00000000
[    1.599391] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.608018] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 1 config (-22 81)
[    1.616313] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.624932] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 1 config (-22 81)
[    1.633195] pwrseq_simple: probe of wifi-pwrseq failed with error -22
[    1.643904] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.652544] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 2 config (-22 82)
[    1.660839] raspberrypi-firmware soc:firmware: Request 0x00030041 returned status 0x00000000
[    1.669446] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 2 state (-22 82)
[    1.677727] leds-gpio: probe of leds failed with error -22
[    1.683735] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.692346] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 6 config (-22 86)
[    1.700636] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.709240] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 6 config (-22 86)
[    1.717496] reg-fixed-voltage: probe of sd_vcc_reg failed with error -22
[    1.725546] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.734176] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 4 config (-22 84)
[    1.742465] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
[    1.751072] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 4 config (-22 84)
[    1.759332] gpio-regulator: probe of sd_io_1v8_reg failed with error -22
[    1.768042] raspberrypi-firmware soc:firmware: Request 0x00028001 returned status 0x00000000
[    1.780871] ALSA device list:
[    1.783960]   No soundcards found.
[    1.787633] Waiting for root device PARTUUID=45a8dd8a-02...

I am unsure if it is related to the issue that Amit is having or
if that makes sense at all but I can reliably reproduce it.

v5.8-rc1: OK
v5.8-rc1 + d9765e41d8e9e: OK
v5.8-rc1 + "of_address: Add bus type match for pci ranges parser": OK
v5.8-rc1 + both: BROKEN

I wanted to test the series to see if this fixes anything. If you would
prefer a different thread for this or further information, please let
me know.

Cheers,
Nathan
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-31  1:10                                 ` Nathan Chancellor
@ 2020-07-31  7:19                                   ` Amit Pundir
  2020-07-31 10:09                                   ` Nicolas Saenz Julienne
  1 sibling, 0 replies; 28+ messages in thread
From: Amit Pundir @ 2020-07-31  7:19 UTC (permalink / raw)
  To: Nathan Chancellor
  Cc: lkml, jeremy.linton, Sumit Semwal, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy,
	Christoph Hellwig

On Fri, 31 Jul 2020 at 06:40, Nathan Chancellor
<natechancellor@gmail.com> wrote:
>
> On Tue, Jul 28, 2020 at 12:09:18PM +0200, Christoph Hellwig wrote:
> > Ok, I found a slight bug that wasn't intended.  I wanted to make sure
> > we can always fall back to a lower pool, but got that wrong.  Should be
> > fixed in the next version.
>
> Hi Christoph and Nicolas,
>
> Did a version of that series ever get send out? I am coming into the
> conversation late but I am running into an issue with the Raspberry Pi 4
> not booting on linux-next, which appears to be due to this patch now in
> mainline as commit d9765e41d8e9 ("dma-pool: do not allocate pool memory
> from CMA") combined with
> https://lore.kernel.org/lkml/20200725014529.1143208-2-jiaxun.yang@flygoat.com/
> in -next:
>
> [    1.423163] raspberrypi-firmware soc:firmware: Request 0x00000001 returned status 0x00000000
> [    1.431883] raspberrypi-firmware soc:firmware: Request 0x00030046 returned status 0x00000000
> [    1.443888] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.452527] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 0 config (-22 80)
> [    1.460836] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.469445] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 1 config (-22 81)
> [    1.477735] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.486350] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 2 config (-22 82)
> [    1.494639] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.503246] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 3 config (-22 83)
> [    1.511529] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.520131] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 4 config (-22 84)
> [    1.528414] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.537017] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 5 config (-22 85)
> [    1.545299] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.553903] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 6 config (-22 86)
> [    1.562184] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.570787] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 7 config (-22 87)
> [    1.579897] raspberrypi-firmware soc:firmware: Request 0x00030030 returned status 0x00000000
> [    1.589419] raspberrypi-firmware soc:firmware: Request 0x00028001 returned status 0x00000000
> [    1.599391] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.608018] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 1 config (-22 81)
> [    1.616313] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.624932] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 1 config (-22 81)
> [    1.633195] pwrseq_simple: probe of wifi-pwrseq failed with error -22
> [    1.643904] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.652544] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 2 config (-22 82)
> [    1.660839] raspberrypi-firmware soc:firmware: Request 0x00030041 returned status 0x00000000
> [    1.669446] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 2 state (-22 82)
> [    1.677727] leds-gpio: probe of leds failed with error -22
> [    1.683735] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.692346] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 6 config (-22 86)
> [    1.700636] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.709240] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 6 config (-22 86)
> [    1.717496] reg-fixed-voltage: probe of sd_vcc_reg failed with error -22
> [    1.725546] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.734176] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 4 config (-22 84)
> [    1.742465] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.751072] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 4 config (-22 84)
> [    1.759332] gpio-regulator: probe of sd_io_1v8_reg failed with error -22
> [    1.768042] raspberrypi-firmware soc:firmware: Request 0x00028001 returned status 0x00000000
> [    1.780871] ALSA device list:
> [    1.783960]   No soundcards found.
> [    1.787633] Waiting for root device PARTUUID=45a8dd8a-02...
>
> I am unsure if it is related to the issue that Amit is having or
> if that makes sense at all but I can reliably reproduce it.
>
> v5.8-rc1: OK
> v5.8-rc1 + d9765e41d8e9e: OK
> v5.8-rc1 + "of_address: Add bus type match for pci ranges parser": OK
> v5.8-rc1 + both: BROKEN
>
> I wanted to test the series to see if this fixes anything. If you would
> prefer a different thread for this or further information, please let
> me know.

Hi Nathan,

Here is the patch series:
https://lists.linuxfoundation.org/pipermail/iommu/2020-July/047008.html
https://lists.linuxfoundation.org/pipermail/iommu/2020-July/047010.html

I hope it works for you, it didn't work for me. More details in this
thread here:
https://lists.linuxfoundation.org/pipermail/iommu/2020-July/047009.html

Regards,
Amit Pundir

>
> Cheers,
> Nathan
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

^ permalink raw reply	[flat|nested] 28+ messages in thread

* Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
  2020-07-31  1:10                                 ` Nathan Chancellor
  2020-07-31  7:19                                   ` Amit Pundir
@ 2020-07-31 10:09                                   ` Nicolas Saenz Julienne
  1 sibling, 0 replies; 28+ messages in thread
From: Nicolas Saenz Julienne @ 2020-07-31 10:09 UTC (permalink / raw)
  To: Nathan Chancellor, Christoph Hellwig
  Cc: Amit Pundir, lkml, jeremy.linton, iommu, John Stultz,
	linux-rpi-kernel, David Rientjes, Robin Murphy, Sumit Semwal

Hi Nathan,

On Thu, 2020-07-30 at 18:10 -0700, Nathan Chancellor wrote:
> On Tue, Jul 28, 2020 at 12:09:18PM +0200, Christoph Hellwig wrote:
> > Ok, I found a slight bug that wasn't intended.  I wanted to make sure
> > we can always fall back to a lower pool, but got that wrong.  Should be
> > fixed in the next version.
> 
> Hi Christoph and Nicolas,
> 
> Did a version of that series ever get send out? I am coming into the
> conversation late but I am running into an issue with the Raspberry Pi 4
> not booting on linux-next, which appears to be due to this patch now in
> mainline as commit d9765e41d8e9 ("dma-pool: do not allocate pool memory
> from CMA") combined with
> https://lore.kernel.org/lkml/20200725014529.1143208-2-jiaxun.yang@flygoat.com/
> in -next:
> 
> [    1.423163] raspberrypi-firmware soc:firmware: Request 0x00000001 returned status 0x00000000
> [    1.431883] raspberrypi-firmware soc:firmware: Request 0x00030046 returned status 0x00000000
> [    1.443888] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.452527] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 0 config (-22 80)
> [    1.460836] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.469445] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 1 config (-22 81)
> [    1.477735] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.486350] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 2 config (-22 82)
> [    1.494639] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.503246] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 3 config (-22 83)
> [    1.511529] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.520131] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 4 config (-22 84)
> [    1.528414] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.537017] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 5 config (-22 85)
> [    1.545299] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.553903] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 6 config (-22 86)
> [    1.562184] raspberrypi-firmware soc:firmware: Request 0x00030043
> [    1.570787] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 7 config (-22 87)
> [    1.579897] raspberrypi-firmware soc:firmware: Request 0x00030030 returned status 0x00000000
> [    1.589419] raspberrypi-firmware soc:firmware: Request 0x00028001 returned status 0x00000000
> [    1.599391] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.608018] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 1 config (-22 81)
> [    1.616313] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.624932] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 1 config (-22 81)
> [    1.633195] pwrseq_simple: probe of wifi-pwrseq failed with error -22
> [    1.643904] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.652544] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 2 config (-22 82)
> [    1.660839] raspberrypi-firmware soc:firmware: Request 0x00030041 returned status 0x00000000
> [    1.669446] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 2 state (-22 82)
> [    1.677727] leds-gpio: probe of leds failed with error -22
> [    1.683735] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.692346] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 6 config (-22 86)
> [    1.700636] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.709240] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 6 config (-22 86)
> [    1.717496] reg-fixed-voltage: probe of sd_vcc_reg failed with error -22
> [    1.725546] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.734176] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 4 config (-22 84)
> [    1.742465] raspberrypi-firmware soc:firmware: Request 0x00030043 returned status 0x00000000
> [    1.751072] raspberrypi-exp-gpio soc:firmware:gpio: Failed to get GPIO 4 config (-22 84)
> [    1.759332] gpio-regulator: probe of sd_io_1v8_reg failed with error -22
> [    1.768042] raspberrypi-firmware soc:firmware: Request 0x00028001 returned status 0x00000000
> [    1.780871] ALSA device list:
> [    1.783960]   No soundcards found.
> [    1.787633] Waiting for root device PARTUUID=45a8dd8a-02...
> 
> I am unsure if it is related to the issue that Amit is having or
> if that makes sense at all but I can reliably reproduce it.
> 
> v5.8-rc1: OK
> v5.8-rc1 + d9765e41d8e9e: OK
> v5.8-rc1 + "of_address: Add bus type match for pci ranges parser": OK
> v5.8-rc1 + both: BROKEN
> 
> I wanted to test the series to see if this fixes anything. If you would
> prefer a different thread for this or further information, please let
> me know.

This is a DT issue, dev->bus_dma_limit is not being properly initialized.
Without d9765e41d8e9e all atomic dma allocations fall into CMA, which is DMA
friendly in RPi4, but it isn't the case anymore with the patch. We now rely on
dev->bus_dma_limit being correct to get memory from the right place.

I already sent a fix to the DT folks.

Regards,
Nicolas

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^ permalink raw reply	[flat|nested] 28+ messages in thread

end of thread, back to index

Thread overview: 28+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-08 16:49 [PATCH] dma-pool: Do not allocate pool memory from CMA Nicolas Saenz Julienne
2020-07-08 16:58 ` Christoph Hellwig
2020-07-08 23:14 ` Jeremy Linton
2020-07-09 21:47 ` David Rientjes via iommu
2020-07-21  7:21 ` Amit Pundir
2020-07-21  8:39   ` Nicolas Saenz Julienne
2020-07-21  8:54     ` Amit Pundir
2020-07-21 11:15       ` Nicolas Saenz Julienne
2020-07-21 11:28         ` Christoph Hellwig
2020-07-21 11:37           ` Nicolas Saenz Julienne
2020-07-21 12:16             ` Amit Pundir
2020-07-21 12:15         ` Amit Pundir
2020-07-21 12:45           ` Nicolas Saenz Julienne
2020-07-21 15:22             ` Amit Pundir
2020-07-21 16:27               ` Nicolas Saenz Julienne
2020-07-23  5:14                 ` Amit Pundir
2020-07-24  9:36                   ` Nicolas Saenz Julienne
2020-07-24 11:06                     ` Amit Pundir
2020-07-24 13:41                       ` Christoph Hellwig
2020-07-24 16:19                         ` Amit Pundir
2020-07-24 16:27                           ` Christoph Hellwig
2020-07-27 17:56                         ` Nicolas Saenz Julienne
2020-07-28  9:13                           ` Christoph Hellwig
2020-07-28  9:30                             ` Nicolas Saenz Julienne
2020-07-28 10:09                               ` Christoph Hellwig
2020-07-31  1:10                                 ` Nathan Chancellor
2020-07-31  7:19                                   ` Amit Pundir
2020-07-31 10:09                                   ` Nicolas Saenz Julienne

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