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Date: Mon, 10 Dec 2018 20:02:00 +0100
From: Christoph Hellwig <hch@....de>
To: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Christoph Hellwig <hch@....de>, Shawn Guo <shawnguo@...nel.org>,
Fabio Estevam <fabio.estevam@....com>,
linux-arm-kernel@...ts.infradead.org,
iommu@...ts.linux-foundation.org, linux-imx@....com,
linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org
Subject: Re: dma_declare_coherent_memory on main memory
On Mon, Dec 10, 2018 at 08:26:48AM +0100, Sascha Hauer wrote:
> > the ARM imx27/31 ports and various sh boards use
> > dma_declare_coherent_memory on main memory taken from the memblock
> > allocator.
> >
> > Is there any good reason these couldn't be switched to CMA areas?
> > Getting rid of these magic dma_declare_coherent_memory area would
> > help making the dma allocator a lot simpler.
>
> At least for i.MX27/31 I'd say this predates CMA support, so historical
> reasons.
Ok. Do you still have test hardware for i.MX? If so I'd love to see
if the patch below works. Note that this is the brute force approach,
just having a global CMA pool might be a little more elegant.
diff --git a/arch/arm/configs/imx_v4_v5_defconfig b/arch/arm/configs/imx_v4_v5_defconfig
index 8661dd9b064a..88852e7e5e7e 100644
--- a/arch/arm/configs/imx_v4_v5_defconfig
+++ b/arch/arm/configs/imx_v4_v5_defconfig
@@ -185,3 +185,5 @@ CONFIG_NLS_ISO8859_1=y
CONFIG_NLS_ISO8859_15=m
CONFIG_FONTS=y
CONFIG_FONT_8x8=y
+CONFIG_CMA=y
+CONFIG_DMA_CMA=y
diff --git a/arch/arm/configs/imx_v6_v7_defconfig b/arch/arm/configs/imx_v6_v7_defconfig
index 1ad5736c8fa6..16c8d717316c 100644
--- a/arch/arm/configs/imx_v6_v7_defconfig
+++ b/arch/arm/configs/imx_v6_v7_defconfig
@@ -444,3 +444,5 @@ CONFIG_PROVE_LOCKING=y
# CONFIG_DEBUG_BUGVERBOSE is not set
# CONFIG_FTRACE is not set
# CONFIG_ARM_UNWIND is not set
+CONFIG_CMA=y
+CONFIG_DMA_CMA=y
diff --git a/arch/arm/mach-imx/mach-imx27_visstrim_m10.c b/arch/arm/mach-imx/mach-imx27_visstrim_m10.c
index 5169dfba9718..2339a50d5459 100644
--- a/arch/arm/mach-imx/mach-imx27_visstrim_m10.c
+++ b/arch/arm/mach-imx/mach-imx27_visstrim_m10.c
@@ -23,6 +23,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/cma.h>
#include <linux/platform_device.h>
#include <linux/mtd/physmap.h>
#include <linux/i2c.h>
@@ -35,6 +36,7 @@
#include <linux/platform_data/asoc-mx27vis.h>
#include <media/soc_camera.h>
#include <sound/tlv320aic32x4.h>
+#include <asm/dma-contiguous.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
@@ -245,6 +247,7 @@ static phys_addr_t mx2_camera_base __initdata;
static void __init visstrim_analog_camera_init(void)
{
struct platform_device *pdev;
+ struct cma *cma;
gpio_set_value(TVP5150_PWDN, 1);
ndelay(1);
@@ -257,9 +260,10 @@ static void __init visstrim_analog_camera_init(void)
if (IS_ERR(pdev))
return;
- dma_declare_coherent_memory(&pdev->dev, mx2_camera_base,
- mx2_camera_base, MX2_CAMERA_BUF_SIZE,
- DMA_MEMORY_EXCLUSIVE);
+ if (cma_init_reserved_mem(mx2_camera_base, MX2_CAMERA_BUF_SIZE, 0,
+ "visstrim-cam", &cma))
+ return;
+ dma_contiguous_early_fixup(mx2_camera_base, MX2_CAMERA_BUF_SIZE);
}
static void __init visstrim_reserve(void)
@@ -440,13 +444,16 @@ static const struct imx_ssi_platform_data visstrim_m10_ssi_pdata __initconst = {
static void __init visstrim_coda_init(void)
{
struct platform_device *pdev;
+ struct cma *cma;
pdev = imx27_add_coda();
- dma_declare_coherent_memory(&pdev->dev,
- mx2_camera_base + MX2_CAMERA_BUF_SIZE,
- mx2_camera_base + MX2_CAMERA_BUF_SIZE,
- MX2_CAMERA_BUF_SIZE,
- DMA_MEMORY_EXCLUSIVE);
+ if (IS_ERR(pdev))
+ return;
+ if (cma_init_reserved_mem(mx2_camera_base + MX2_CAMERA_BUF_SIZE,
+ MX2_CAMERA_BUF_SIZE, 0, "visstrim-coda", &cma))
+ return;
+ dma_contiguous_early_fixup(mx2_camera_base + MX2_CAMERA_BUF_SIZE,
+ MX2_CAMERA_BUF_SIZE);
}
/* DMA deinterlace */
@@ -459,21 +466,22 @@ static void __init visstrim_deinterlace_init(void)
{
int ret = -ENOMEM;
struct platform_device *pdev = &visstrim_deinterlace;
+ struct cma *cma;
ret = platform_device_register(pdev);
- dma_declare_coherent_memory(&pdev->dev,
- mx2_camera_base + 2 * MX2_CAMERA_BUF_SIZE,
- mx2_camera_base + 2 * MX2_CAMERA_BUF_SIZE,
- MX2_CAMERA_BUF_SIZE,
- DMA_MEMORY_EXCLUSIVE);
+ if (cma_init_reserved_mem(mx2_camera_base + 2 * MX2_CAMERA_BUF_SIZE,
+ MX2_CAMERA_BUF_SIZE, 0, "visstrim-deinterlace", &cma))
+ return;
+ dma_contiguous_early_fixup(mx2_camera_base + 2 * MX2_CAMERA_BUF_SIZE,
+ MX2_CAMERA_BUF_SIZE);
}
/* Emma-PrP for format conversion */
static void __init visstrim_emmaprp_init(void)
{
struct platform_device *pdev;
- int ret;
+ struct cma *cma;
pdev = imx27_add_mx2_emmaprp();
if (IS_ERR(pdev))
@@ -483,12 +491,12 @@ static void __init visstrim_emmaprp_init(void)
* Use the same memory area as the analog camera since both
* devices are, by nature, exclusive.
*/
- ret = dma_declare_coherent_memory(&pdev->dev,
- mx2_camera_base, mx2_camera_base,
- MX2_CAMERA_BUF_SIZE,
- DMA_MEMORY_EXCLUSIVE);
- if (ret)
+ if (cma_init_reserved_mem(mx2_camera_base, MX2_CAMERA_BUF_SIZE, 0,
+ "visstrim-emmaprp", &cma)) {
pr_err("Failed to declare memory for emmaprp\n");
+ return;
+ }
+ dma_contiguous_early_fixup(mx2_camera_base, MX2_CAMERA_BUF_SIZE);
}
/* Audio */
diff --git a/arch/arm/mach-imx/mach-mx31moboard.c b/arch/arm/mach-imx/mach-mx31moboard.c
index 643a3d749703..1c0705ec0ccd 100644
--- a/arch/arm/mach-imx/mach-mx31moboard.c
+++ b/arch/arm/mach-imx/mach-mx31moboard.c
@@ -13,6 +13,7 @@
*/
#include <linux/delay.h>
+#include <linux/cma.h>
#include <linux/dma-mapping.h>
#include <linux/gfp.h>
#include <linux/gpio.h>
@@ -37,6 +38,7 @@
#include <linux/usb/otg.h>
#include <linux/usb/ulpi.h>
+#include <asm/dma-contiguous.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
@@ -466,6 +468,7 @@ static int __init mx31moboard_init_cam(void)
{
int ret;
struct platform_device *pdev;
+ struct cma *cma;
imx31_add_ipu_core();
@@ -473,18 +476,18 @@ static int __init mx31moboard_init_cam(void)
if (IS_ERR(pdev))
return PTR_ERR(pdev);
- ret = dma_declare_coherent_memory(&pdev->dev,
- mx3_camera_base, mx3_camera_base,
- MX3_CAMERA_BUF_SIZE,
- DMA_MEMORY_EXCLUSIVE);
+ ret = cma_init_reserved_mem(mx3_camera_base, MX3_CAMERA_BUF_SIZE, 0,
+ "mx31cam", &cma);
if (ret)
- goto err;
+ goto out_device_put;
+ dma_contiguous_early_fixup(mx3_camera_base, MX3_CAMERA_BUF_SIZE);
ret = platform_device_add(pdev);
if (ret)
-err:
- platform_device_put(pdev);
-
+ goto out_device_put;
+ return 0;
+out_device_put:
+ platform_device_put(pdev);
return ret;
}
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