renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-22 20:23:57 +08:00
Code

drm/exynos: use real device for DMA-mapping operations

Browse Source 
This patch changes device pointer provided to all calls to DMA-mapping
subsystem from the virtual exynos-drm 'device' to the real device pointer
of one of the CRTC devices (decon, fimd or mixer). This way no more hacks
will be needed to configure proper DMA-mapping address space on the common
virtual exynos-drm device. This change also removes the need for some
hacks in IOMMU related code. It also finally solves the problem of Exynos
DRM driver not working on ARM64 architecture, which provides noop-based
DMA-mapping operations for virtual platform devices.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Marek Szyprowski 2016-02-29 17:50:53 +09:00 committed by Inki Dae
parent a5fb26cdaa
commit f43c35966a
7 changed files with 69 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/gpu/drm/exynos/exynos_drm_drv.c
View File

@ -130,6 +130,8 @@ static void exynos_drm_atomic_work(struct work_struct *work)
exynos_atomic_commit_complete(commit);
}
static struct device *exynos_drm_get_dma_device(void);
static int exynos_drm_load(struct drm_device *dev, unsigned long flags)
{
struct exynos_drm_private *private;
@ -147,6 +149,16 @@ static int exynos_drm_load(struct drm_device *dev, unsigned long flags)
dev_set_drvdata(dev->dev, dev);
dev->dev_private = (void *)private;
/* the first real CRTC device is used for all dma mapping operations */
private->dma_dev = exynos_drm_get_dma_device();
if (!private->dma_dev) {
DRM_ERROR("no device found for DMA mapping operations.\n");
ret = -ENODEV;
goto err_free_private;
}
DRM_INFO("Exynos DRM: using %s device for DMA mapping operations\n",
dev_name(private->dma_dev));
/*
* create mapping to manage iommu table and set a pointer to iommu
* mapping structure to iommu_mapping of private data.
@ -488,6 +500,7 @@ struct exynos_drm_driver_info {
#define DRM_COMPONENT_DRIVER BIT(0) /* supports component framework */
#define DRM_VIRTUAL_DEVICE BIT(1) /* create virtual platform device */
#define DRM_DMA_DEVICE BIT(2) /* can be used for dma allocations */
#define DRV_PTR(drv, cond) (IS_ENABLED(cond) ? &drv : NULL)
@ -498,16 +511,16 @@ struct exynos_drm_driver_info {
static struct exynos_drm_driver_info exynos_drm_drivers[] = {
{
DRV_PTR(fimd_driver, CONFIG_DRM_EXYNOS_FIMD),
DRM_COMPONENT_DRIVER
DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
}, {
DRV_PTR(exynos5433_decon_driver, CONFIG_DRM_EXYNOS5433_DECON),
DRM_COMPONENT_DRIVER
DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
}, {
DRV_PTR(decon_driver, CONFIG_DRM_EXYNOS7_DECON),
DRM_COMPONENT_DRIVER
DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
}, {
DRV_PTR(mixer_driver, CONFIG_DRM_EXYNOS_MIXER),
DRM_COMPONENT_DRIVER
DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
}, {
DRV_PTR(mic_driver, CONFIG_DRM_EXYNOS_MIC),
DRM_COMPONENT_DRIVER
@ -615,6 +628,27 @@ static struct platform_driver exynos_drm_platform_driver = {
},
};
static struct device *exynos_drm_get_dma_device(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
struct device *dev;
if (!info->driver || !(info->flags & DRM_DMA_DEVICE))
continue;
while ((dev = bus_find_device(&platform_bus_type, NULL,
&info->driver->driver,
(void *)platform_bus_type.match))) {
put_device(dev);
return dev;
}
}
return NULL;
}
static void exynos_drm_unregister_devices(void)
{
int i;

9
drivers/gpu/drm/exynos/exynos_drm_drv.h
View File

@ -219,8 +219,10 @@ struct exynos_drm_private {
struct drm_crtc *crtc[MAX_CRTC];
struct drm_property *plane_zpos_property;
struct device *dma_dev;
unsigned long da_start;
unsigned long da_space_size;
void *mapping;
unsigned int pipe;
@ -230,6 +232,13 @@ struct exynos_drm_private {
wait_queue_head_t wait;
};
static inline struct device *to_dma_dev(struct drm_device *dev)
{
struct exynos_drm_private *priv = dev->dev_private;
return priv->dma_dev;
}
/*
* Exynos drm sub driver structure.
*

2
drivers/gpu/drm/exynos/exynos_drm_fbdev.c
View File

@ -50,7 +50,7 @@ static int exynos_drm_fb_mmap(struct fb_info *info,
if (vm_size > exynos_gem->size)
return -EINVAL;
ret = dma_mmap_attrs(helper->dev->dev, vma, exynos_gem->cookie,
ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
exynos_gem->dma_addr, exynos_gem->size,
&exynos_gem->dma_attrs);
if (ret < 0) {

7
drivers/gpu/drm/exynos/exynos_drm_g2d.c
View File

@ -259,7 +259,7 @@ static int g2d_init_cmdlist(struct g2d_data *g2d)
init_dma_attrs(&g2d->cmdlist_dma_attrs);
dma_set_attr(DMA_ATTR_WRITE_COMBINE, &g2d->cmdlist_dma_attrs);
g2d->cmdlist_pool_virt = dma_alloc_attrs(subdrv->drm_dev->dev,
g2d->cmdlist_pool_virt = dma_alloc_attrs(to_dma_dev(subdrv->drm_dev),
G2D_CMDLIST_POOL_SIZE,
&g2d->cmdlist_pool, GFP_KERNEL,
&g2d->cmdlist_dma_attrs);
@ -293,7 +293,7 @@ static int g2d_init_cmdlist(struct g2d_data *g2d)
return 0;
err:
dma_free_attrs(subdrv->drm_dev->dev, G2D_CMDLIST_POOL_SIZE,
dma_free_attrs(to_dma_dev(subdrv->drm_dev), G2D_CMDLIST_POOL_SIZE,
g2d->cmdlist_pool_virt,
g2d->cmdlist_pool, &g2d->cmdlist_dma_attrs);
return ret;
@ -306,7 +306,8 @@ static void g2d_fini_cmdlist(struct g2d_data *g2d)
kfree(g2d->cmdlist_node);
if (g2d->cmdlist_pool_virt && g2d->cmdlist_pool) {
dma_free_attrs(subdrv->drm_dev->dev, G2D_CMDLIST_POOL_SIZE,
dma_free_attrs(to_dma_dev(subdrv->drm_dev),
G2D_CMDLIST_POOL_SIZE,
g2d->cmdlist_pool_virt,
g2d->cmdlist_pool, &g2d->cmdlist_dma_attrs);
}

14
drivers/gpu/drm/exynos/exynos_drm_gem.c
View File

@ -65,7 +65,7 @@ static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
return -ENOMEM;
}
exynos_gem->cookie = dma_alloc_attrs(dev->dev, exynos_gem->size,
exynos_gem->cookie = dma_alloc_attrs(to_dma_dev(dev), exynos_gem->size,
&exynos_gem->dma_addr, GFP_KERNEL,
&exynos_gem->dma_attrs);
if (!exynos_gem->cookie) {
@ -73,7 +73,7 @@ static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
goto err_free;
}
ret = dma_get_sgtable_attrs(dev->dev, &sgt, exynos_gem->cookie,
ret = dma_get_sgtable_attrs(to_dma_dev(dev), &sgt, exynos_gem->cookie,
exynos_gem->dma_addr, exynos_gem->size,
&exynos_gem->dma_attrs);
if (ret < 0) {
@ -98,7 +98,7 @@ static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
err_sgt_free:
sg_free_table(&sgt);
err_dma_free:
dma_free_attrs(dev->dev, exynos_gem->size, exynos_gem->cookie,
dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
exynos_gem->dma_addr, &exynos_gem->dma_attrs);
err_free:
drm_free_large(exynos_gem->pages);
@ -118,7 +118,7 @@ static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
(unsigned long)exynos_gem->dma_addr, exynos_gem->size);
dma_free_attrs(dev->dev, exynos_gem->size, exynos_gem->cookie,
dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
(dma_addr_t)exynos_gem->dma_addr,
&exynos_gem->dma_attrs);
@ -335,7 +335,7 @@ static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
if (vm_size > exynos_gem->size)
return -EINVAL;
ret = dma_mmap_attrs(drm_dev->dev, vma, exynos_gem->cookie,
ret = dma_mmap_attrs(to_dma_dev(drm_dev), vma, exynos_gem->cookie,
exynos_gem->dma_addr, exynos_gem->size,
&exynos_gem->dma_attrs);
if (ret < 0) {
@ -381,7 +381,7 @@ int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
mutex_lock(&drm_dev->struct_mutex);
nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
nents = dma_map_sg(to_dma_dev(drm_dev), sgt->sgl, sgt->nents, dir);
if (!nents) {
DRM_ERROR("failed to map sgl with dma.\n");
mutex_unlock(&drm_dev->struct_mutex);
@ -396,7 +396,7 @@ void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
struct sg_table *sgt,
enum dma_data_direction dir)
{
dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
dma_unmap_sg(to_dma_dev(drm_dev), sgt->sgl, sgt->nents, dir);
}
void exynos_drm_gem_free_object(struct drm_gem_object *obj)

37
drivers/gpu/drm/exynos/exynos_drm_iommu.c
View File

@ -30,7 +30,6 @@ int drm_create_iommu_mapping(struct drm_device *drm_dev)
{
struct dma_iommu_mapping *mapping = NULL;
struct exynos_drm_private *priv = drm_dev->dev_private;
struct device *dev = drm_dev->dev;
if (!priv->da_start)
priv->da_start = EXYNOS_DEV_ADDR_START;
@ -43,18 +42,9 @@ int drm_create_iommu_mapping(struct drm_device *drm_dev)
if (IS_ERR(mapping))
return PTR_ERR(mapping);
dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
GFP_KERNEL);
if (!dev->dma_parms)
goto error;
dma_set_max_seg_size(dev, 0xffffffffu);
dev->archdata.mapping = mapping;
priv->mapping = mapping;
return 0;
error:
arm_iommu_release_mapping(mapping);
return -ENOMEM;
}
/*
@ -67,9 +57,9 @@ error:
*/
void drm_release_iommu_mapping(struct drm_device *drm_dev)
{
struct device *dev = drm_dev->dev;
struct exynos_drm_private *priv = drm_dev->dev_private;
arm_iommu_release_mapping(dev->archdata.mapping);
arm_iommu_release_mapping(priv->mapping);
}
/*
@ -84,10 +74,10 @@ void drm_release_iommu_mapping(struct drm_device *drm_dev)
int drm_iommu_attach_device(struct drm_device *drm_dev,
struct device *subdrv_dev)
{
struct device *dev = drm_dev->dev;
struct exynos_drm_private *priv = drm_dev->dev_private;
int ret;
if (!dev->archdata.mapping)
if (!priv->mapping)
return 0;
subdrv_dev->dma_parms = devm_kzalloc(subdrv_dev,
@ -101,23 +91,12 @@ int drm_iommu_attach_device(struct drm_device *drm_dev,
if (subdrv_dev->archdata.mapping)
arm_iommu_detach_device(subdrv_dev);
ret = arm_iommu_attach_device(subdrv_dev, dev->archdata.mapping);
ret = arm_iommu_attach_device(subdrv_dev, priv->mapping);
if (ret < 0) {
DRM_DEBUG_KMS("failed iommu attach.\n");
return ret;
}
/*
* Set dma_ops to drm_device just one time.
*
* The dma mapping api needs device object and the api is used
* to allocate physial memory and map it with iommu table.
* If iommu attach succeeded, the sub driver would have dma_ops
* for iommu and also all sub drivers have same dma_ops.
*/
if (get_dma_ops(dev) == get_dma_ops(NULL))
set_dma_ops(dev, get_dma_ops(subdrv_dev));
return 0;
}
@ -133,8 +112,8 @@ int drm_iommu_attach_device(struct drm_device *drm_dev,
void drm_iommu_detach_device(struct drm_device *drm_dev,
struct device *subdrv_dev)
{
struct device *dev = drm_dev->dev;
struct dma_iommu_mapping *mapping = dev->archdata.mapping;
struct exynos_drm_private *priv = drm_dev->dev_private;
struct dma_iommu_mapping *mapping = priv->mapping;
if (!mapping || !mapping->domain)
return;

4
drivers/gpu/drm/exynos/exynos_drm_iommu.h
View File

@ -29,9 +29,9 @@ void drm_iommu_detach_device(struct drm_device *dev_dev,
static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
{
struct device *dev = drm_dev->dev;
struct exynos_drm_private *priv = drm_dev->dev_private;
return dev->archdata.mapping ? true : false;
return priv->mapping ? true : false;
}
#else