On Fri, Oct 9, 2020 at 12:21 PM Chris Wilson chris@chris-wilson.co.uk wrote:
vgem is a minimalistic driver that provides shmemfs objects to userspace that may then be used as an in-memory surface and transported across dma-buf to other drivers. Since it's introduction, drm_gem_shmem_helper now provides the same shmemfs facilities and so we can trim vgem to wrap the helper.
Signed-off-by: Chris Wilson chris@chris-wilson.co.uk
drivers/gpu/drm/Kconfig | 1 + drivers/gpu/drm/vgem/vgem_drv.c | 281 ++------------------------------ drivers/gpu/drm/vgem/vgem_drv.h | 11 -- 3 files changed, 13 insertions(+), 280 deletions(-)
Nice diffstat :-)
Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 147d61b9674e..db2ff76638cd 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -278,6 +278,7 @@ source "drivers/gpu/drm/i915/Kconfig" config DRM_VGEM tristate "Virtual GEM provider" depends on DRM
select DRM_GEM_SHMEM_HELPER help Choose this option to get a virtual graphics memory manager, as used by Mesa's software renderer for enhanced performance.diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c index fa54a6d1403d..73cb17c4f7a8 100644 --- a/drivers/gpu/drm/vgem/vgem_drv.c +++ b/drivers/gpu/drm/vgem/vgem_drv.c @@ -38,6 +38,7 @@
#include <drm/drm_drv.h> #include <drm/drm_file.h> +#include <drm/drm_gem_shmem_helper.h> #include <drm/drm_ioctl.h> #include <drm/drm_managed.h> #include <drm/drm_prime.h> @@ -50,87 +51,11 @@ #define DRIVER_MAJOR 1 #define DRIVER_MINOR 0
-static const struct drm_gem_object_funcs vgem_gem_object_funcs;
static struct vgem_device { struct drm_device drm; struct platform_device *platform; } *vgem_device;
-static void vgem_gem_free_object(struct drm_gem_object *obj) -{
struct drm_vgem_gem_object *vgem_obj = to_vgem_bo(obj);kvfree(vgem_obj->pages);mutex_destroy(&vgem_obj->pages_lock);if (obj->import_attach)drm_prime_gem_destroy(obj, vgem_obj->table);drm_gem_object_release(obj);kfree(vgem_obj);-}
-static vm_fault_t vgem_gem_fault(struct vm_fault *vmf) -{
struct vm_area_struct *vma = vmf->vma;struct drm_vgem_gem_object *obj = vma->vm_private_data;/* We don't use vmf->pgoff since that has the fake offset */unsigned long vaddr = vmf->address;vm_fault_t ret = VM_FAULT_SIGBUS;loff_t num_pages;pgoff_t page_offset;page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT;num_pages = DIV_ROUND_UP(obj->base.size, PAGE_SIZE);if (page_offset >= num_pages)return VM_FAULT_SIGBUS;mutex_lock(&obj->pages_lock);if (obj->pages) {get_page(obj->pages[page_offset]);vmf->page = obj->pages[page_offset];ret = 0;}mutex_unlock(&obj->pages_lock);if (ret) {struct page *page;page = shmem_read_mapping_page(file_inode(obj->base.filp)->i_mapping,page_offset);if (!IS_ERR(page)) {vmf->page = page;ret = 0;} else switch (PTR_ERR(page)) {case -ENOSPC:case -ENOMEM:ret = VM_FAULT_OOM;break;case -EBUSY:ret = VM_FAULT_RETRY;break;case -EFAULT:case -EINVAL:ret = VM_FAULT_SIGBUS;break;default:WARN_ON(PTR_ERR(page));ret = VM_FAULT_SIGBUS;break;}}return ret;-}
-static const struct vm_operations_struct vgem_gem_vm_ops = {
.fault = vgem_gem_fault,.open = drm_gem_vm_open,.close = drm_gem_vm_close,-};
static int vgem_open(struct drm_device *dev, struct drm_file *file) { struct vgem_file *vfile; @@ -159,41 +84,25 @@ static void vgem_postclose(struct drm_device *dev, struct drm_file *file) kfree(vfile); }
-static struct drm_vgem_gem_object *__vgem_gem_create(struct drm_device *dev, +static struct drm_gem_shmem_object *__vgem_gem_create(struct drm_device *dev, unsigned long size) {
struct drm_vgem_gem_object *obj;int ret;obj = kzalloc(sizeof(*obj), GFP_KERNEL);if (!obj)return ERR_PTR(-ENOMEM);
struct drm_gem_shmem_object *obj;
obj->base.funcs = &vgem_gem_object_funcs;ret = drm_gem_object_init(dev, &obj->base, roundup(size, PAGE_SIZE));if (ret) {kfree(obj);return ERR_PTR(ret);}mutex_init(&obj->pages_lock);
obj = drm_gem_shmem_create(dev, round_up(size, PAGE_SIZE));if (IS_ERR(obj))return obj;obj->map_cached = true; return obj;}
-static void __vgem_gem_destroy(struct drm_vgem_gem_object *obj) -{
drm_gem_object_release(&obj->base);kfree(obj);-}
static struct drm_gem_object *vgem_gem_create(struct drm_device *dev, struct drm_file *file, unsigned int *handle, unsigned long size) {
struct drm_vgem_gem_object *obj;
struct drm_gem_shmem_object *obj; int ret; obj = __vgem_gem_create(dev, size);@@ -239,96 +148,9 @@ static struct drm_ioctl_desc vgem_ioctls[] = { DRM_IOCTL_DEF_DRV(VGEM_FENCE_SIGNAL, vgem_fence_signal_ioctl, DRM_RENDER_ALLOW), };
-static int vgem_mmap(struct file *filp, struct vm_area_struct *vma) -{
unsigned long flags = vma->vm_flags;int ret;ret = drm_gem_mmap(filp, vma);if (ret)return ret;/* Keep the WC mmaping set by drm_gem_mmap() but our pages* are ordinary and not special.*/vma->vm_flags = flags | VM_DONTEXPAND | VM_DONTDUMP;return 0;-}
-static const struct file_operations vgem_driver_fops = {
.owner = THIS_MODULE,.open = drm_open,.mmap = vgem_mmap,.poll = drm_poll,.read = drm_read,.unlocked_ioctl = drm_ioctl,.compat_ioctl = drm_compat_ioctl,.release = drm_release,-};
-static struct page **vgem_pin_pages(struct drm_vgem_gem_object *bo) -{
mutex_lock(&bo->pages_lock);if (bo->pages_pin_count++ == 0) {struct page **pages;pages = drm_gem_get_pages(&bo->base);if (IS_ERR(pages)) {bo->pages_pin_count--;mutex_unlock(&bo->pages_lock);return pages;}bo->pages = pages;}mutex_unlock(&bo->pages_lock);return bo->pages;-}
-static void vgem_unpin_pages(struct drm_vgem_gem_object *bo) -{
mutex_lock(&bo->pages_lock);if (--bo->pages_pin_count == 0) {drm_gem_put_pages(&bo->base, bo->pages, true, true);bo->pages = NULL;}mutex_unlock(&bo->pages_lock);-}
-static int vgem_prime_pin(struct drm_gem_object *obj) -{
struct drm_vgem_gem_object *bo = to_vgem_bo(obj);long n_pages = obj->size >> PAGE_SHIFT;struct page **pages;+DEFINE_DRM_GEM_FOPS(vgem_driver_fops);
pages = vgem_pin_pages(bo);if (IS_ERR(pages))return PTR_ERR(pages);/* Flush the object from the CPU cache so that importers can rely* on coherent indirect access via the exported dma-address.*/drm_clflush_pages(pages, n_pages);return 0;-}
-static void vgem_prime_unpin(struct drm_gem_object *obj) -{
struct drm_vgem_gem_object *bo = to_vgem_bo(obj);vgem_unpin_pages(bo);-}
-static struct sg_table *vgem_prime_get_sg_table(struct drm_gem_object *obj) -{
struct drm_vgem_gem_object *bo = to_vgem_bo(obj);return drm_prime_pages_to_sg(obj->dev, bo->pages, bo->base.size >> PAGE_SHIFT);-}
-static struct drm_gem_object* vgem_prime_import(struct drm_device *dev, +static struct drm_gem_object *vgem_prime_import(struct drm_device *dev, struct dma_buf *dma_buf) { struct vgem_device *vgem = container_of(dev, typeof(*vgem), drm); @@ -336,85 +158,6 @@ static struct drm_gem_object* vgem_prime_import(struct drm_device *dev, return drm_gem_prime_import_dev(dev, dma_buf, &vgem->platform->dev); }
-static struct drm_gem_object *vgem_prime_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach, struct sg_table *sg)-{
struct drm_vgem_gem_object *obj;int npages;obj = __vgem_gem_create(dev, attach->dmabuf->size);if (IS_ERR(obj))return ERR_CAST(obj);npages = PAGE_ALIGN(attach->dmabuf->size) / PAGE_SIZE;obj->table = sg;obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);if (!obj->pages) {__vgem_gem_destroy(obj);return ERR_PTR(-ENOMEM);}obj->pages_pin_count++; /* perma-pinned */drm_prime_sg_to_page_addr_arrays(obj->table, obj->pages, NULL,npages);return &obj->base;-}
-static void *vgem_prime_vmap(struct drm_gem_object *obj) -{
struct drm_vgem_gem_object *bo = to_vgem_bo(obj);long n_pages = obj->size >> PAGE_SHIFT;struct page **pages;pages = vgem_pin_pages(bo);if (IS_ERR(pages))return NULL;return vmap(pages, n_pages, 0, pgprot_writecombine(PAGE_KERNEL));-}
-static void vgem_prime_vunmap(struct drm_gem_object *obj, void *vaddr) -{
struct drm_vgem_gem_object *bo = to_vgem_bo(obj);vunmap(vaddr);vgem_unpin_pages(bo);-}
-static int vgem_prime_mmap(struct drm_gem_object *obj,
struct vm_area_struct *vma)-{
int ret;if (obj->size < vma->vm_end - vma->vm_start)return -EINVAL;if (!obj->filp)return -ENODEV;ret = call_mmap(obj->filp, vma);if (ret)return ret;fput(vma->vm_file);vma->vm_file = get_file(obj->filp);vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));return 0;-}
-static const struct drm_gem_object_funcs vgem_gem_object_funcs = {
.free = vgem_gem_free_object,.pin = vgem_prime_pin,.unpin = vgem_prime_unpin,.get_sg_table = vgem_prime_get_sg_table,.vmap = vgem_prime_vmap,.vunmap = vgem_prime_vunmap,.vm_ops = &vgem_gem_vm_ops,-};
static struct drm_driver vgem_driver = { .driver_features = DRIVER_GEM | DRIVER_RENDER, .open = vgem_open, @@ -428,8 +171,8 @@ static struct drm_driver vgem_driver = { .prime_handle_to_fd = drm_gem_prime_handle_to_fd, .prime_fd_to_handle = drm_gem_prime_fd_to_handle, .gem_prime_import = vgem_prime_import,
.gem_prime_import_sg_table = vgem_prime_import_sg_table,.gem_prime_mmap = vgem_prime_mmap,
.gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table,.gem_prime_mmap = drm_gem_prime_mmap, .name = DRIVER_NAME, .desc = DRIVER_DESC,diff --git a/drivers/gpu/drm/vgem/vgem_drv.h b/drivers/gpu/drm/vgem/vgem_drv.h index 0ed300317f87..34cf63e6fb3d 100644 --- a/drivers/gpu/drm/vgem/vgem_drv.h +++ b/drivers/gpu/drm/vgem/vgem_drv.h @@ -39,17 +39,6 @@ struct vgem_file { struct mutex fence_mutex; };
-#define to_vgem_bo(x) container_of(x, struct drm_vgem_gem_object, base) -struct drm_vgem_gem_object {
struct drm_gem_object base;struct page **pages;unsigned int pages_pin_count;struct mutex pages_lock;struct sg_table *table;-};
int vgem_fence_open(struct vgem_file *file); int vgem_fence_attach_ioctl(struct drm_device *dev, void *data, -- 2.20.1
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