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Date: Thu, 24 Feb 2011 10:45:03 -0500
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To: Alex Deucher <alexdeucher@...il.com>
Cc: Dave Airlie <airlied@...hat.com>, dri-devel@...ts.freedesktop.org,
Jerome Glisse <jglisse@...hat.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] radeon: DMA unmap dummy page during unload/unbind.
On Thu, Feb 24, 2011 at 03:25:43AM -0500, Alex Deucher wrote:
> On Wed, Feb 23, 2011 at 3:48 PM, Konrad Rzeszutek Wilk
> <konrad.wilk@...cle.com> wrote:
> > git commit 82568565683b4991964a5fc89a9ca0c7122818e8 adds a dummy page
> > so that if something goes wrong it will at least fetch/write data
> > _only_ to this location.
> >
> > The radeon_gart_init sets it up.. but there is no corresponding
> > free-ing of this dummy page. There is one invocation to free-ing
> > the dummy page in r600.c but nothing in the radeon_gart_fini path.
> >
> > This patch adds in the unloading/unbind path the free-ing of said
> > dummy page.
>
> This patch looks good, but we might as go one step further and just
> remove the dummy page stuff from r600.c, rv770.c and evergreen.c and
> just consolidate it in gart_init() and gart_fini(). See the attached
> patch.
Excellent. Thank you!
>
> Alex
>
> >
> > Without this patch and if we have CONFIG_DMA_API_DEBUG=y set we
> > get this:
> >
> > [ 22.113420] drm: unregistered panic notifier
> > [ 22.126500] [drm] radeon: finishing device.
> > [ 22.130868] [drm] radeon: cp finalized
> > [ 22.135384] [TTM] Finalizing pool allocator.
> > [ 22.139669] [TTM] Zone kernel: Used memory at exit: 0 kiB.
> > [ 22.145229] [drm] radeon: ttm finalized
> > [ 22.149055] vga_switcheroo: disabled
> > [ 22.153393] ------------[ cut here ]------------
> > [ 22.158021] WARNING: at /home/konrad/ssd/linux/lib/dma-debug.c:689 dma_debug_device_change+0x12e/0x161()
> > [ 22.167475] Hardware name: PowerEdge T105
> > [ 22.171562] pci 0000:01:08.0: DMA-API: device driver has pending DMA allocations while released from device [count=1]
> >
> > With this patch we don't see this anymore.
> >
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> > ---
> > drivers/gpu/drm/radeon/radeon_gart.c | 2 ++
> > 1 files changed, 2 insertions(+), 0 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c
> > index 6501611..dc04c7b 100644
> > --- a/drivers/gpu/drm/radeon/radeon_gart.c
> > +++ b/drivers/gpu/drm/radeon/radeon_gart.c
> > @@ -269,4 +269,6 @@ void radeon_gart_fini(struct radeon_device *rdev)
> > kfree(rdev->gart.pages_addr);
> > rdev->gart.pages = NULL;
> > rdev->gart.pages_addr = NULL;
> > +
> > + radeon_dummy_page_fini(rdev);
> > }
> > --
> > 1.7.1
> >
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@...ts.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/dri-devel
> >
> From d22bba30a66ba95cabeed7a71c982dfa96521384 Mon Sep 17 00:00:00 2001
> From: Alex Deucher <alexdeucher@...il.com>
> Date: Thu, 24 Feb 2011 03:16:21 -0500
> Subject: [PATCH] drm/radeon/kms: clean up gart dummy page handling
>
> As per Konrad's original patch, the dummy page used
> by the gart code and allocated in radeon_gart_init()
> was not freed properly in radeon_gart_fini().
>
> At the same time r6xx and newer allocated and freed the
> dummy page on their own. So to do Konrad's patch one
> better, just remove the allocation and freeing of the
> dummy page in the r6xx, 7xx, evergreen, and ni code and
> allocate and free in the gart_init/fini() functions for
> all asics.
>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Cc: Jerome Glisse <jglisse@...hat.com>
> Signed-off-by: Alex Deucher <alexdeucher@...il.com>
> ---
> drivers/gpu/drm/radeon/evergreen.c | 4 ----
> drivers/gpu/drm/radeon/r600.c | 4 ----
> drivers/gpu/drm/radeon/radeon_gart.c | 2 ++
> drivers/gpu/drm/radeon/rv770.c | 4 ----
> 4 files changed, 2 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
> index 789441e..9ecb2b6 100644
> --- a/drivers/gpu/drm/radeon/evergreen.c
> +++ b/drivers/gpu/drm/radeon/evergreen.c
> @@ -3048,9 +3048,6 @@ int evergreen_init(struct radeon_device *rdev)
> {
> int r;
>
> - r = radeon_dummy_page_init(rdev);
> - if (r)
> - return r;
> /* This don't do much */
> r = radeon_gem_init(rdev);
> if (r)
> @@ -3162,7 +3159,6 @@ void evergreen_fini(struct radeon_device *rdev)
> radeon_atombios_fini(rdev);
> kfree(rdev->bios);
> rdev->bios = NULL;
> - radeon_dummy_page_fini(rdev);
> }
>
> static void evergreen_pcie_gen2_enable(struct radeon_device *rdev)
> diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
> index 1252198..88eaffc 100644
> --- a/drivers/gpu/drm/radeon/r600.c
> +++ b/drivers/gpu/drm/radeon/r600.c
> @@ -2510,9 +2510,6 @@ int r600_init(struct radeon_device *rdev)
> {
> int r;
>
> - r = radeon_dummy_page_init(rdev);
> - if (r)
> - return r;
> if (r600_debugfs_mc_info_init(rdev)) {
> DRM_ERROR("Failed to register debugfs file for mc !\n");
> }
> @@ -2626,7 +2623,6 @@ void r600_fini(struct radeon_device *rdev)
> radeon_atombios_fini(rdev);
> kfree(rdev->bios);
> rdev->bios = NULL;
> - radeon_dummy_page_fini(rdev);
> }
>
>
> diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c
> index 6501611..dc04c7b 100644
> --- a/drivers/gpu/drm/radeon/radeon_gart.c
> +++ b/drivers/gpu/drm/radeon/radeon_gart.c
> @@ -269,4 +269,6 @@ void radeon_gart_fini(struct radeon_device *rdev)
> kfree(rdev->gart.pages_addr);
> rdev->gart.pages = NULL;
> rdev->gart.pages_addr = NULL;
> +
> + radeon_dummy_page_fini(rdev);
> }
> diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c
> index d8ba676..6a312e6 100644
> --- a/drivers/gpu/drm/radeon/rv770.c
> +++ b/drivers/gpu/drm/radeon/rv770.c
> @@ -1256,9 +1256,6 @@ int rv770_init(struct radeon_device *rdev)
> {
> int r;
>
> - r = radeon_dummy_page_init(rdev);
> - if (r)
> - return r;
> /* This don't do much */
> r = radeon_gem_init(rdev);
> if (r)
> @@ -1373,7 +1370,6 @@ void rv770_fini(struct radeon_device *rdev)
> radeon_atombios_fini(rdev);
> kfree(rdev->bios);
> rdev->bios = NULL;
> - radeon_dummy_page_fini(rdev);
> }
>
> static void rv770_pcie_gen2_enable(struct radeon_device *rdev)
> --
> 1.7.1.1
>
--
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