While trying to get boot-logo up on exynos5420 SMDK which has eDP panel connected with resolution 2560x1600, following error occured even with IOMMU enabled: [0.880000] [drm:lowlevel_buffer_allocate] *ERROR* failed to allocate buffer. [0.890000] [drm] Initialized exynos 1.0.0 20110530 on minor 0
This patch fixes the issue by adding a check for IOMMU.
Signed-off-by: Vikas Sajjan vikas.sajjan@linaro.org Signed-off-by: Arun Kumar arun.kk@samsung.com --- drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c index 8e60bd6..2a86666 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c @@ -16,6 +16,7 @@ #include <drm/drm_crtc.h> #include <drm/drm_fb_helper.h> #include <drm/drm_crtc_helper.h> +#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h" #include "exynos_drm_fb.h" @@ -143,6 +144,7 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, struct platform_device *pdev = dev->platformdev; unsigned long size; int ret; + unsigned int flag;
DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", sizes->surface_width, sizes->surface_height, @@ -166,7 +168,12 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, size = mode_cmd.pitches[0] * mode_cmd.height;
/* 0 means to allocate physically continuous memory */ - exynos_gem_obj = exynos_drm_gem_create(dev, 0, size); + if (!is_drm_iommu_supported(dev)) + flag = 0; + else + flag = EXYNOS_BO_NONCONTIG; + + exynos_gem_obj = exynos_drm_gem_create(dev, flag, size); if (IS_ERR(exynos_gem_obj)) { ret = PTR_ERR(exynos_gem_obj); goto err_release_framebuffer;
Hi Vikas,
On Thursday 01 of August 2013 16:49:32 Vikas Sajjan wrote:
While trying to get boot-logo up on exynos5420 SMDK which has eDP panel connected with resolution 2560x1600, following error occured even with IOMMU enabled: [0.880000] [drm:lowlevel_buffer_allocate] *ERROR* failed to allocate buffer. [0.890000] [drm] Initialized exynos 1.0.0 20110530 on minor 0
This patch fixes the issue by adding a check for IOMMU.
Signed-off-by: Vikas Sajjan vikas.sajjan@linaro.org Signed-off-by: Arun Kumar arun.kk@samsung.com
drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c index 8e60bd6..2a86666 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c @@ -16,6 +16,7 @@ #include <drm/drm_crtc.h> #include <drm/drm_fb_helper.h> #include <drm/drm_crtc_helper.h> +#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h" #include "exynos_drm_fb.h" @@ -143,6 +144,7 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, struct platform_device *pdev = dev->platformdev; unsigned long size; int ret;
unsigned int flag;
DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", sizes->surface_width, sizes->surface_height,
@@ -166,7 +168,12 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, size = mode_cmd.pitches[0] * mode_cmd.height;
/* 0 means to allocate physically continuous memory */
- exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
- if (!is_drm_iommu_supported(dev))
flag = 0;- else
flag = EXYNOS_BO_NONCONTIG;
While noncontig memory might be used for devices that support IOMMU, there should be no problem with using contig memory for them, so this seems more like masking the original problem rather than tracking it down.
Could you check why the allocation fails when requesting contiguous memory?
Best regards, Tomasz
On Thu, Aug 1, 2013 at 7:20 PM, Tomasz Figa tomasz.figa@gmail.com wrote:
Hi Vikas,
On Thursday 01 of August 2013 16:49:32 Vikas Sajjan wrote:
While trying to get boot-logo up on exynos5420 SMDK which has eDP panel connected with resolution 2560x1600, following error occured even with IOMMU enabled: [0.880000] [drm:lowlevel_buffer_allocate] *ERROR* failed to allocate buffer. [0.890000] [drm] Initialized exynos 1.0.0 20110530 on minor 0
This patch fixes the issue by adding a check for IOMMU.
Signed-off-by: Vikas Sajjan vikas.sajjan@linaro.org Signed-off-by: Arun Kumar arun.kk@samsung.com
drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c index 8e60bd6..2a86666 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c @@ -16,6 +16,7 @@ #include <drm/drm_crtc.h> #include <drm/drm_fb_helper.h> #include <drm/drm_crtc_helper.h> +#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h" #include "exynos_drm_fb.h" @@ -143,6 +144,7 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, struct platform_device *pdev = dev->platformdev; unsigned long size; int ret;
unsigned int flag; DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", sizes->surface_width, sizes->surface_height,@@ -166,7 +168,12 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, size = mode_cmd.pitches[0] * mode_cmd.height;
/* 0 means to allocate physically continuous memory */
exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
if (!is_drm_iommu_supported(dev))flag = 0;elseflag = EXYNOS_BO_NONCONTIG;While noncontig memory might be used for devices that support IOMMU, there should be no problem with using contig memory for them, so this seems more like masking the original problem rather than tracking it down.
it is probably a good idea to not require contig memory when it is not needed for performance or functionality (and if it is only performance, then fallback gracefully to non-contig).. but yeah, would be good to know if this is masking another issue all the same
BR, -R
Could you check why the allocation fails when requesting contiguous memory?
Best regards, Tomasz
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Hi Rob,
On 2 August 2013 06:03, Rob Clark robdclark@gmail.com wrote:
On Thu, Aug 1, 2013 at 7:20 PM, Tomasz Figa tomasz.figa@gmail.com wrote:
Hi Vikas,
On Thursday 01 of August 2013 16:49:32 Vikas Sajjan wrote:
While trying to get boot-logo up on exynos5420 SMDK which has eDP panel connected with resolution 2560x1600, following error occured even with IOMMU enabled: [0.880000] [drm:lowlevel_buffer_allocate] *ERROR* failed to allocate buffer. [0.890000] [drm] Initialized exynos 1.0.0 20110530 on minor 0
This patch fixes the issue by adding a check for IOMMU.
Signed-off-by: Vikas Sajjan vikas.sajjan@linaro.org Signed-off-by: Arun Kumar arun.kk@samsung.com
drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c index 8e60bd6..2a86666 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c @@ -16,6 +16,7 @@ #include <drm/drm_crtc.h> #include <drm/drm_fb_helper.h> #include <drm/drm_crtc_helper.h> +#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h" #include "exynos_drm_fb.h" @@ -143,6 +144,7 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, struct platform_device *pdev = dev->platformdev; unsigned long size; int ret;
unsigned int flag; DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", sizes->surface_width, sizes->surface_height,@@ -166,7 +168,12 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, size = mode_cmd.pitches[0] * mode_cmd.height;
/* 0 means to allocate physically continuous memory */
exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
if (!is_drm_iommu_supported(dev))flag = 0;elseflag = EXYNOS_BO_NONCONTIG;While noncontig memory might be used for devices that support IOMMU, there should be no problem with using contig memory for them, so this seems more like masking the original problem rather than tracking it down.
it is probably a good idea to not require contig memory when it is not needed for performance or functionality (and if it is only performance, then fallback gracefully to non-contig).. but yeah, would be good to know if this is masking another issue all the same
Whats happening with CONTIG flag and with IOMMU, is
__iommu_alloc_buffer() ---> dma_alloc_from_contiguous() and in this function it fails at this condition check if (pageno >= cma->count)
So I tried increasing the CONFIG_CMA_SIZE_MBYTES to 24, this check succeeds and it works well without my patch.
But what about the case where CONFIG_CMA is disabled , yet i want bigger memory for a device. I think using IOMMU we can achieve this.
correct me, if i am wrong.
BR, -R
Could you check why the allocation fails when requesting contiguous memory?
Best regards, Tomasz
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Hi Vikas,
On Friday 02 of August 2013 12:08:52 Vikas Sajjan wrote:
Hi Rob,
On 2 August 2013 06:03, Rob Clark robdclark@gmail.com wrote:
On Thu, Aug 1, 2013 at 7:20 PM, Tomasz Figa tomasz.figa@gmail.com
wrote:
Hi Vikas,
On Thursday 01 of August 2013 16:49:32 Vikas Sajjan wrote:
While trying to get boot-logo up on exynos5420 SMDK which has eDP panel connected with resolution 2560x1600, following error occured even with IOMMU enabled: [0.880000] [drm:lowlevel_buffer_allocate] *ERROR* failed to allocate buffer. [0.890000] [drm] Initialized exynos 1.0.0 20110530 on minor 0
This patch fixes the issue by adding a check for IOMMU.
Signed-off-by: Vikas Sajjan vikas.sajjan@linaro.org Signed-off-by: Arun Kumar arun.kk@samsung.com
drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
[snip]
@@ -166,7 +168,12 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, size = mode_cmd.pitches[0] * mode_cmd.height;
/* 0 means to allocate physically continuous memory */
exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
if (!is_drm_iommu_supported(dev))flag = 0;elseflag = EXYNOS_BO_NONCONTIG;While noncontig memory might be used for devices that support IOMMU, there should be no problem with using contig memory for them, so this seems more like masking the original problem rather than tracking it down.>
it is probably a good idea to not require contig memory when it is not needed for performance or functionality (and if it is only performance, then fallback gracefully to non-contig).. but yeah, would be good to know if this is masking another issue all the same
Whats happening with CONTIG flag and with IOMMU, is
__iommu_alloc_buffer() ---> dma_alloc_from_contiguous() and in this function it fails at this condition check if (pageno >= cma->count)
So I tried increasing the CONFIG_CMA_SIZE_MBYTES to 24, this check succeeds and it works well without my patch.
But what about the case where CONFIG_CMA is disabled , yet i want bigger memory for a device. I think using IOMMU we can achieve this.
correct me, if i am wrong.
This is probably fine. I'm not sure about performance aspects of using noncontig memory as framebuffer, though. This needs to be checked and if there is some performance penalty, I would make noncontig allocation a fallback case, if contig fails, as Rob has suggested.
Also I think you should adjust the commit message to say that non- contiguous memory can be used when IOMMU is supported, so there is no need to force contiguous allocations, since this is not a bug fix, but rather a feature this patch is adding.
Best regards, Tomasz
BR, -R
Could you check why the allocation fails when requesting contiguous memory?
Best regards, Tomasz
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2013/8/2 Vikas Sajjan vikas.sajjan@linaro.org
Hi Rob,
On 2 August 2013 06:03, Rob Clark robdclark@gmail.com wrote:
On Thu, Aug 1, 2013 at 7:20 PM, Tomasz Figa tomasz.figa@gmail.com
wrote:
Hi Vikas,
On Thursday 01 of August 2013 16:49:32 Vikas Sajjan wrote:
While trying to get boot-logo up on exynos5420 SMDK which has eDP panel connected with resolution 2560x1600, following error occured even with IOMMU enabled: [0.880000] [drm:lowlevel_buffer_allocate] *ERROR* failed to allocate buffer. [0.890000] [drm] Initialized exynos 1.0.0 20110530 on minor 0
This patch fixes the issue by adding a check for IOMMU.
Signed-off-by: Vikas Sajjan vikas.sajjan@linaro.org Signed-off-by: Arun Kumar arun.kk@samsung.com
drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c index 8e60bd6..2a86666 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c @@ -16,6 +16,7 @@ #include <drm/drm_crtc.h> #include <drm/drm_fb_helper.h> #include <drm/drm_crtc_helper.h> +#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h" #include "exynos_drm_fb.h" @@ -143,6 +144,7 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, struct platform_device *pdev = dev->platformdev; unsigned long size; int ret;
unsigned int flag; DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", sizes->surface_width, sizes->surface_height,@@ -166,7 +168,12 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, size = mode_cmd.pitches[0] * mode_cmd.height;
/* 0 means to allocate physically continuous memory */
exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
if (!is_drm_iommu_supported(dev))flag = 0;elseflag = EXYNOS_BO_NONCONTIG;While noncontig memory might be used for devices that support IOMMU,
there
should be no problem with using contig memory for them, so this seems
more
like masking the original problem rather than tracking it down.
it is probably a good idea to not require contig memory when it is not needed for performance or functionality (and if it is only performance, then fallback gracefully to non-contig).. but yeah, would be good to know if this is masking another issue all the same
Whats happening with CONTIG flag and with IOMMU, is
__iommu_alloc_buffer() ---> dma_alloc_from_contiguous() and in this function it fails at this condition check if (pageno >= cma->count)
So I tried increasing the CONFIG_CMA_SIZE_MBYTES to 24, this check succeeds and it works well without my patch.
But what about the case where CONFIG_CMA is disabled , yet i want bigger memory for a device. I think using IOMMU we can achieve this.
correct me, if i am wrong.
I'm on summer vacation so I'm afraid that I cannot test and look into it but I guess you guy didn't declare CMA region for Exynos drm. And in this case, the size of CMA declared region is 16MB as default. That is why works well after increasing default size, CONFIG_CMA_SIZE_MBYTES, to 24MB. And I mentioned long time ago, we are required to use physically contiguous memory in case that bootloader uses physically contiguous memory for its own framebuffer, and kernel wants to share the bootloader's framebuffer region to resolve flickering issue while booted; that is required for product. And one question, is there any reason that you guy should use non-contiguous memory for framebuffer with iommu?
Thanks, Inki Dae
BR, -R
Could you check why the allocation fails when requesting contiguous memory?
Best regards, Tomasz
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Hi Inki Dae,
On 2 August 2013 12:58, Inki Dae inki.dae@samsung.com wrote:
2013/8/2 Vikas Sajjan vikas.sajjan@linaro.org
Hi Rob,
On 2 August 2013 06:03, Rob Clark robdclark@gmail.com wrote:
On Thu, Aug 1, 2013 at 7:20 PM, Tomasz Figa tomasz.figa@gmail.com wrote:
Hi Vikas,
On Thursday 01 of August 2013 16:49:32 Vikas Sajjan wrote:
While trying to get boot-logo up on exynos5420 SMDK which has eDP panel connected with resolution 2560x1600, following error occured even with IOMMU enabled: [0.880000] [drm:lowlevel_buffer_allocate] *ERROR* failed to allocate buffer. [0.890000] [drm] Initialized exynos 1.0.0 20110530 on minor 0
This patch fixes the issue by adding a check for IOMMU.
Signed-off-by: Vikas Sajjan vikas.sajjan@linaro.org Signed-off-by: Arun Kumar arun.kk@samsung.com
drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c index 8e60bd6..2a86666 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c @@ -16,6 +16,7 @@ #include <drm/drm_crtc.h> #include <drm/drm_fb_helper.h> #include <drm/drm_crtc_helper.h> +#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h" #include "exynos_drm_fb.h" @@ -143,6 +144,7 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, struct platform_device *pdev = dev->platformdev; unsigned long size; int ret;
unsigned int flag; DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", sizes->surface_width, sizes->surface_height,@@ -166,7 +168,12 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, size = mode_cmd.pitches[0] * mode_cmd.height;
/* 0 means to allocate physically continuous memory */
exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
if (!is_drm_iommu_supported(dev))flag = 0;elseflag = EXYNOS_BO_NONCONTIG;While noncontig memory might be used for devices that support IOMMU, there should be no problem with using contig memory for them, so this seems more like masking the original problem rather than tracking it down.
it is probably a good idea to not require contig memory when it is not needed for performance or functionality (and if it is only performance, then fallback gracefully to non-contig).. but yeah, would be good to know if this is masking another issue all the same
Whats happening with CONTIG flag and with IOMMU, is
__iommu_alloc_buffer() ---> dma_alloc_from_contiguous() and in this function it fails at this condition check if (pageno >= cma->count)
So I tried increasing the CONFIG_CMA_SIZE_MBYTES to 24, this check succeeds and it works well without my patch.
But what about the case where CONFIG_CMA is disabled , yet i want bigger memory for a device. I think using IOMMU we can achieve this.
correct me, if i am wrong.
I'm on summer vacation so I'm afraid that I cannot test and look into it but I guess you guy didn't declare CMA region for Exynos drm. And in this case, the size of CMA declared region is 16MB as default. That is why works well after increasing default size, CONFIG_CMA_SIZE_MBYTES, to 24MB. And I mentioned long time ago, we are required to use physically contiguous memory in case that bootloader uses physically contiguous memory for its own framebuffer, and kernel wants to share the bootloader's framebuffer region to resolve flickering issue while booted; that is required for product. And one question, is there any reason that you guy should use non-contiguous memory for framebuffer with iommu?
yeah, we could not allocate CMA region for FIMD, because the function dma_declare_contiguous() needs "dev" as the first argument and we have access to "dev" node only if it is NON-DT way of probing like the way it is done in arch/arm/mach-davinci/devices-da8xx.c But now, since the probing is through DT way, there is NO way ( Let me know if something is newly added ) to call dma_declare_contiguous() and reserve CMA region .
we don't have any specific requirement for NON_CONTIG or CONTIG memory, but only requirement was to allocate a bigger memory like ( 2560 * 1600 * 4 ) for FB.
But as Rob suggested, we should have fall-back case if CONTIG memory allocation fails, as below
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c index df43fa9..15de626 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c @@ -144,7 +144,6 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, struct platform_device *pdev = dev->platformdev; unsigned long size; int ret;
DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", sizes->surface_width, sizes->surface_height, @@ -167,16 +166,14 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
size = mode_cmd.pitches[0] * mode_cmd.height;
- /* 0 means to allocate physically continuous memory */ - exynos_gem_obj = exynos_drm_gem_create(dev, 0, size); + exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size); if (IS_ERR(exynos_gem_obj)) { - ret = PTR_ERR(exynos_gem_obj); - goto err_release_framebuffer; + if(is_drm_iommu_supported(dev)) + exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, size); + if (IS_ERR(exynos_gem_obj)) { + ret = PTR_ERR(exynos_gem_obj); + goto err_release_framebuffer; + } + dev_warn("\n exynos_gem_obj for FB is allocated with non physically continuous + memory \n"); }
Thanks, Inki Dae
BR, -R
Could you check why the allocation fails when requesting contiguous memory?
Best regards, Tomasz
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Hi Vikas,
On 08/02/2013 12:10 PM, Vikas Sajjan wrote:
yeah, we could not allocate CMA region for FIMD, because the function dma_declare_contiguous() needs "dev" as the first argument and we have access to "dev" node only if it is NON-DT way of probing like the way it is done in arch/arm/mach-davinci/devices-da8xx.c But now, since the probing is through DT way, there is NO way ( Let me know if something is newly added ) to call dma_declare_contiguous() and reserve CMA region .
See this patch series [1]. We have have been using this kind of bindings for assigning physically contiguous memory regions to the Exynos multimedia devices, instead of what's currently in mainline where same physical addresses are repeated in dts for various boards without much thought. And where custom device specific parsing code is required at arch side.
$ git grep mfc-[lr] arch/arm/boot/dts
arch/arm/boot/dts/exynos4210-origen.dts: samsung,mfc-r = <0x43000000 0x800000>; arch/arm/boot/dts/exynos4210-origen.dts: samsung,mfc-l = <0x51000000 0x800000>; arch/arm/boot/dts/exynos4210-smdkv310.dts: samsung,mfc-r = <0x43000000 0x800000>; arch/arm/boot/dts/exynos4210-smdkv310.dts: samsung,mfc-l = <0x51000000 0x800000>; arch/arm/boot/dts/exynos4412-origen.dts: samsung,mfc-r = <0x43000000 0x800000>; arch/arm/boot/dts/exynos4412-origen.dts: samsung,mfc-l = <0x51000000 0x800000>; arch/arm/boot/dts/exynos4412-smdk4412.dts: samsung,mfc-r = <0x43000000 0x800000>; arch/arm/boot/dts/exynos4412-smdk4412.dts: samsung,mfc-l = <0x51000000 0x800000>; arch/arm/boot/dts/exynos5250-arndale.dts: samsung,mfc-r = <0x43000000 0x800000>; arch/arm/boot/dts/exynos5250-arndale.dts: samsung,mfc-l = <0x51000000 0x800000>; arch/arm/boot/dts/exynos5250-smdk5250.dts: samsung,mfc-r = <0x43000000 0x800000>; arch/arm/boot/dts/exynos5250-smdk5250.dts: samsung,mfc-l = <0x51000000 0x800000>;
[1] http://www.spinics.net/lists/arm-kernel/msg263130.html
Regards, Sylwester
Hi Sylwester,
On 2 August 2013 16:28, Sylwester Nawrocki s.nawrocki@samsung.com wrote:
Hi Vikas,
On 08/02/2013 12:10 PM, Vikas Sajjan wrote:
yeah, we could not allocate CMA region for FIMD, because the function dma_declare_contiguous() needs "dev" as the first argument and we have access to "dev" node only if it is NON-DT way of probing like the way it is done in arch/arm/mach-davinci/devices-da8xx.c But now, since the probing is through DT way, there is NO way ( Let me know if something is newly added ) to call dma_declare_contiguous() and reserve CMA region .
See this patch series [1]. We have have been using this kind of bindings for assigning physically contiguous memory regions to the Exynos multimedia devices, instead of what's currently in mainline where same physical addresses are repeated in dts for various boards without much thought. And where custom device specific parsing code is required at arch side.
$ git grep mfc-[lr] arch/arm/boot/dts
arch/arm/boot/dts/exynos4210-origen.dts: samsung,mfc-r = <0x43000000 0x800000>; arch/arm/boot/dts/exynos4210-origen.dts: samsung,mfc-l = <0x51000000 0x800000>; arch/arm/boot/dts/exynos4210-smdkv310.dts: samsung,mfc-r = <0x43000000 0x800000>; arch/arm/boot/dts/exynos4210-smdkv310.dts: samsung,mfc-l = <0x51000000 0x800000>; arch/arm/boot/dts/exynos4412-origen.dts: samsung,mfc-r = <0x43000000 0x800000>; arch/arm/boot/dts/exynos4412-origen.dts: samsung,mfc-l = <0x51000000 0x800000>; arch/arm/boot/dts/exynos4412-smdk4412.dts: samsung,mfc-r = <0x43000000 0x800000>; arch/arm/boot/dts/exynos4412-smdk4412.dts: samsung,mfc-l = <0x51000000 0x800000>; arch/arm/boot/dts/exynos5250-arndale.dts: samsung,mfc-r = <0x43000000 0x800000>; arch/arm/boot/dts/exynos5250-arndale.dts: samsung,mfc-l = <0x51000000 0x800000>; arch/arm/boot/dts/exynos5250-smdk5250.dts: samsung,mfc-r = <0x43000000 0x800000>; arch/arm/boot/dts/exynos5250-smdk5250.dts: samsung,mfc-l = <0x51000000 0x800000>;
Thanks, its good that now we have a new way to reserve CMA region.
Regards, Sylwester
Hi Tomasz,
On 2 August 2013 04:50, Tomasz Figa tomasz.figa@gmail.com wrote:
Hi Vikas,
On Thursday 01 of August 2013 16:49:32 Vikas Sajjan wrote:
While trying to get boot-logo up on exynos5420 SMDK which has eDP panel connected with resolution 2560x1600, following error occured even with IOMMU enabled: [0.880000] [drm:lowlevel_buffer_allocate] *ERROR* failed to allocate buffer. [0.890000] [drm] Initialized exynos 1.0.0 20110530 on minor 0
This patch fixes the issue by adding a check for IOMMU.
Signed-off-by: Vikas Sajjan vikas.sajjan@linaro.org Signed-off-by: Arun Kumar arun.kk@samsung.com
drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c index 8e60bd6..2a86666 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c @@ -16,6 +16,7 @@ #include <drm/drm_crtc.h> #include <drm/drm_fb_helper.h> #include <drm/drm_crtc_helper.h> +#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h" #include "exynos_drm_fb.h" @@ -143,6 +144,7 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, struct platform_device *pdev = dev->platformdev; unsigned long size; int ret;
unsigned int flag; DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", sizes->surface_width, sizes->surface_height,@@ -166,7 +168,12 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, size = mode_cmd.pitches[0] * mode_cmd.height;
/* 0 means to allocate physically continuous memory */
exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
if (!is_drm_iommu_supported(dev))flag = 0;elseflag = EXYNOS_BO_NONCONTIG;While noncontig memory might be used for devices that support IOMMU, there should be no problem with using contig memory for them, so this seems more like masking the original problem rather than tracking it down.
Could you check why the allocation fails when requesting contiguous memory?
It is failing if i am giving bigger resolution like 2560x1600, but if i try for 1280x780 resolution, it works fine. Looks like arm_dma_alloc() is NOT able to allocate bigger buffer of size 2560 * 1600 * 4. Hence i used flag = EXYNOS_BO_NONCONTIG;
Best regards, Tomasz
Hi Vikas,
On 2 August 2013 09:23, Vikas Sajjan vikas.sajjan@linaro.org wrote:
Hi Tomasz,
On 2 August 2013 04:50, Tomasz Figa tomasz.figa@gmail.com wrote:
Hi Vikas,
On Thursday 01 of August 2013 16:49:32 Vikas Sajjan wrote:
While trying to get boot-logo up on exynos5420 SMDK which has eDP panel connected with resolution 2560x1600, following error occured even with IOMMU enabled: [0.880000] [drm:lowlevel_buffer_allocate] *ERROR* failed to allocate buffer. [0.890000] [drm] Initialized exynos 1.0.0 20110530 on minor 0
This patch fixes the issue by adding a check for IOMMU.
Signed-off-by: Vikas Sajjan vikas.sajjan@linaro.org Signed-off-by: Arun Kumar arun.kk@samsung.com
drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c index 8e60bd6..2a86666 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c @@ -16,6 +16,7 @@ #include <drm/drm_crtc.h> #include <drm/drm_fb_helper.h> #include <drm/drm_crtc_helper.h> +#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h" #include "exynos_drm_fb.h" @@ -143,6 +144,7 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, struct platform_device *pdev = dev->platformdev; unsigned long size; int ret;
unsigned int flag; DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", sizes->surface_width, sizes->surface_height,@@ -166,7 +168,12 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, size = mode_cmd.pitches[0] * mode_cmd.height;
/* 0 means to allocate physically continuous memory */
exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
if (!is_drm_iommu_supported(dev))flag = 0;elseflag = EXYNOS_BO_NONCONTIG;While noncontig memory might be used for devices that support IOMMU, there should be no problem with using contig memory for them, so this seems more like masking the original problem rather than tracking it down.
Could you check why the allocation fails when requesting contiguous memory?
It is failing if i am giving bigger resolution like 2560x1600, but if i try for 1280x780 resolution, it works fine. Looks like arm_dma_alloc() is NOT able to allocate bigger buffer of size 2560 * 1600 * 4.
You may need to increase the zoneorder (from current default 11 to say 13) if you need large physically contiguous pages. However I am not sure if it is recommended.
Hi Vikas,
On 1 August 2013 16:49, Vikas Sajjan vikas.sajjan@linaro.org wrote:
While trying to get boot-logo up on exynos5420 SMDK which has eDP panel connected with resolution 2560x1600, following error occured even with IOMMU enabled: [0.880000] [drm:lowlevel_buffer_allocate] *ERROR* failed to allocate buffer. [0.890000] [drm] Initialized exynos 1.0.0 20110530 on minor 0
This patch fixes the issue by adding a check for IOMMU.
Signed-off-by: Vikas Sajjan vikas.sajjan@linaro.org Signed-off-by: Arun Kumar arun.kk@samsung.com
drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c index 8e60bd6..2a86666 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c @@ -16,6 +16,7 @@ #include <drm/drm_crtc.h> #include <drm/drm_fb_helper.h> #include <drm/drm_crtc_helper.h> +#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h" #include "exynos_drm_fb.h" @@ -143,6 +144,7 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, struct platform_device *pdev = dev->platformdev; unsigned long size; int ret;
unsigned int flag; DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", sizes->surface_width, sizes->surface_height,@@ -166,7 +168,12 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, size = mode_cmd.pitches[0] * mode_cmd.height;
/* 0 means to allocate physically continuous memory */
This comment is now wrongly placed. Please use EXYNOS_BO_CONTIG instead of 0 and get rid of this comment altogether.
exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
if (!is_drm_iommu_supported(dev))flag = 0;elseflag = EXYNOS_BO_NONCONTIG;exynos_gem_obj = exynos_drm_gem_create(dev, flag, size); if (IS_ERR(exynos_gem_obj)) { ret = PTR_ERR(exynos_gem_obj); goto err_release_framebuffer;
linaro-kernel@lists.linaro.org
-
Inki Dae -
Rob Clark -
Sachin Kamat -
Sylwester Nawrocki -
Tomasz Figa -
Vikas Sajjan