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![Thomas Zimmermann](/assets/img/avatar_default.png)
Drivers that what to allocate VRAM GEM objects with additional fields can now do this by implementing struct drm_driver.gem_create_object. v3: * separately check allocation failure in if/else branches before upcast to gbo v2: * only cast to gbo within if branch; set gbo directly in else branch Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Acked-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20200106125745.13797-9-tzimmermann@suse.de
1143 lines
28 KiB
C
1143 lines
28 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <drm/drm_debugfs.h>
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#include <drm/drm_device.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_file.h>
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#include <drm/drm_framebuffer.h>
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#include <drm/drm_gem_ttm_helper.h>
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#include <drm/drm_gem_vram_helper.h>
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#include <drm/drm_mode.h>
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#include <drm/drm_plane.h>
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#include <drm/drm_prime.h>
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#include <drm/drm_simple_kms_helper.h>
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#include <drm/ttm/ttm_page_alloc.h>
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static const struct drm_gem_object_funcs drm_gem_vram_object_funcs;
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/**
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* DOC: overview
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*
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* This library provides a GEM buffer object that is backed by video RAM
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* (VRAM). It can be used for framebuffer devices with dedicated memory.
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*
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* The data structure &struct drm_vram_mm and its helpers implement a memory
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* manager for simple framebuffer devices with dedicated video memory. Buffer
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* objects are either placed in video RAM or evicted to system memory. The rsp.
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* buffer object is provided by &struct drm_gem_vram_object.
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*/
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/*
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* Buffer-objects helpers
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*/
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static void drm_gem_vram_cleanup(struct drm_gem_vram_object *gbo)
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{
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/* We got here via ttm_bo_put(), which means that the
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* TTM buffer object in 'bo' has already been cleaned
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* up; only release the GEM object.
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*/
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WARN_ON(gbo->kmap_use_count);
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WARN_ON(gbo->kmap.virtual);
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drm_gem_object_release(&gbo->bo.base);
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}
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static void drm_gem_vram_destroy(struct drm_gem_vram_object *gbo)
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{
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drm_gem_vram_cleanup(gbo);
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kfree(gbo);
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}
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static void ttm_buffer_object_destroy(struct ttm_buffer_object *bo)
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{
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struct drm_gem_vram_object *gbo = drm_gem_vram_of_bo(bo);
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drm_gem_vram_destroy(gbo);
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}
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static void drm_gem_vram_placement(struct drm_gem_vram_object *gbo,
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unsigned long pl_flag)
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{
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unsigned int i;
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unsigned int c = 0;
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u32 invariant_flags = pl_flag & TTM_PL_FLAG_TOPDOWN;
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gbo->placement.placement = gbo->placements;
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gbo->placement.busy_placement = gbo->placements;
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if (pl_flag & TTM_PL_FLAG_VRAM)
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gbo->placements[c++].flags = TTM_PL_FLAG_WC |
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TTM_PL_FLAG_UNCACHED |
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TTM_PL_FLAG_VRAM |
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invariant_flags;
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if (pl_flag & TTM_PL_FLAG_SYSTEM)
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gbo->placements[c++].flags = TTM_PL_MASK_CACHING |
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TTM_PL_FLAG_SYSTEM |
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invariant_flags;
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if (!c)
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gbo->placements[c++].flags = TTM_PL_MASK_CACHING |
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TTM_PL_FLAG_SYSTEM |
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invariant_flags;
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gbo->placement.num_placement = c;
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gbo->placement.num_busy_placement = c;
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for (i = 0; i < c; ++i) {
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gbo->placements[i].fpfn = 0;
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gbo->placements[i].lpfn = 0;
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}
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}
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static int drm_gem_vram_init(struct drm_device *dev,
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struct drm_gem_vram_object *gbo,
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size_t size, unsigned long pg_align)
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{
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struct drm_vram_mm *vmm = dev->vram_mm;
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struct ttm_bo_device *bdev;
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int ret;
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size_t acc_size;
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if (WARN_ONCE(!vmm, "VRAM MM not initialized"))
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return -EINVAL;
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bdev = &vmm->bdev;
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gbo->bo.base.funcs = &drm_gem_vram_object_funcs;
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ret = drm_gem_object_init(dev, &gbo->bo.base, size);
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if (ret)
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return ret;
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acc_size = ttm_bo_dma_acc_size(bdev, size, sizeof(*gbo));
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gbo->bo.bdev = bdev;
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drm_gem_vram_placement(gbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
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ret = ttm_bo_init(bdev, &gbo->bo, size, ttm_bo_type_device,
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&gbo->placement, pg_align, false, acc_size,
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NULL, NULL, ttm_buffer_object_destroy);
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if (ret)
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goto err_drm_gem_object_release;
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return 0;
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err_drm_gem_object_release:
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drm_gem_object_release(&gbo->bo.base);
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return ret;
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}
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/**
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* drm_gem_vram_create() - Creates a VRAM-backed GEM object
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* @dev: the DRM device
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* @size: the buffer size in bytes
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* @pg_align: the buffer's alignment in multiples of the page size
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*
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* Returns:
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* A new instance of &struct drm_gem_vram_object on success, or
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* an ERR_PTR()-encoded error code otherwise.
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*/
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struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,
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size_t size,
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unsigned long pg_align)
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{
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struct drm_gem_vram_object *gbo;
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int ret;
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if (dev->driver->gem_create_object) {
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struct drm_gem_object *gem =
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dev->driver->gem_create_object(dev, size);
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if (!gem)
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return ERR_PTR(-ENOMEM);
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gbo = drm_gem_vram_of_gem(gem);
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} else {
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gbo = kzalloc(sizeof(*gbo), GFP_KERNEL);
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if (!gbo)
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return ERR_PTR(-ENOMEM);
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}
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ret = drm_gem_vram_init(dev, gbo, size, pg_align);
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if (ret < 0)
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goto err_kfree;
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return gbo;
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err_kfree:
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kfree(gbo);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL(drm_gem_vram_create);
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/**
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* drm_gem_vram_put() - Releases a reference to a VRAM-backed GEM object
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* @gbo: the GEM VRAM object
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*
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* See ttm_bo_put() for more information.
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*/
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void drm_gem_vram_put(struct drm_gem_vram_object *gbo)
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{
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ttm_bo_put(&gbo->bo);
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}
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EXPORT_SYMBOL(drm_gem_vram_put);
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/**
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* drm_gem_vram_mmap_offset() - Returns a GEM VRAM object's mmap offset
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* @gbo: the GEM VRAM object
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*
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* See drm_vma_node_offset_addr() for more information.
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*
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* Returns:
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* The buffer object's offset for userspace mappings on success, or
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* 0 if no offset is allocated.
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*/
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u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo)
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{
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return drm_vma_node_offset_addr(&gbo->bo.base.vma_node);
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}
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EXPORT_SYMBOL(drm_gem_vram_mmap_offset);
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/**
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* drm_gem_vram_offset() - \
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Returns a GEM VRAM object's offset in video memory
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* @gbo: the GEM VRAM object
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*
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* This function returns the buffer object's offset in the device's video
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* memory. The buffer object has to be pinned to %TTM_PL_VRAM.
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*
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* Returns:
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* The buffer object's offset in video memory on success, or
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* a negative errno code otherwise.
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*/
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s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo)
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{
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if (WARN_ON_ONCE(!gbo->pin_count))
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return (s64)-ENODEV;
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return gbo->bo.offset;
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}
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EXPORT_SYMBOL(drm_gem_vram_offset);
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static int drm_gem_vram_pin_locked(struct drm_gem_vram_object *gbo,
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unsigned long pl_flag)
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{
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int i, ret;
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struct ttm_operation_ctx ctx = { false, false };
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if (gbo->pin_count)
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goto out;
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if (pl_flag)
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drm_gem_vram_placement(gbo, pl_flag);
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for (i = 0; i < gbo->placement.num_placement; ++i)
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gbo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
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ret = ttm_bo_validate(&gbo->bo, &gbo->placement, &ctx);
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if (ret < 0)
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return ret;
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out:
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++gbo->pin_count;
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return 0;
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}
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/**
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* drm_gem_vram_pin() - Pins a GEM VRAM object in a region.
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* @gbo: the GEM VRAM object
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* @pl_flag: a bitmask of possible memory regions
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*
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* Pinning a buffer object ensures that it is not evicted from
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* a memory region. A pinned buffer object has to be unpinned before
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* it can be pinned to another region. If the pl_flag argument is 0,
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* the buffer is pinned at its current location (video RAM or system
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* memory).
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*
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* Small buffer objects, such as cursor images, can lead to memory
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* fragmentation if they are pinned in the middle of video RAM. This
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* is especially a problem on devices with only a small amount of
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* video RAM. Fragmentation can prevent the primary framebuffer from
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* fitting in, even though there's enough memory overall. The modifier
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* DRM_GEM_VRAM_PL_FLAG_TOPDOWN marks the buffer object to be pinned
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* at the high end of the memory region to avoid fragmentation.
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*
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* Returns:
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* 0 on success, or
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* a negative error code otherwise.
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*/
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int drm_gem_vram_pin(struct drm_gem_vram_object *gbo, unsigned long pl_flag)
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{
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int ret;
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ret = ttm_bo_reserve(&gbo->bo, true, false, NULL);
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if (ret)
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return ret;
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ret = drm_gem_vram_pin_locked(gbo, pl_flag);
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ttm_bo_unreserve(&gbo->bo);
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return ret;
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}
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EXPORT_SYMBOL(drm_gem_vram_pin);
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static int drm_gem_vram_unpin_locked(struct drm_gem_vram_object *gbo)
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{
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int i, ret;
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struct ttm_operation_ctx ctx = { false, false };
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if (WARN_ON_ONCE(!gbo->pin_count))
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return 0;
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--gbo->pin_count;
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if (gbo->pin_count)
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return 0;
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for (i = 0; i < gbo->placement.num_placement ; ++i)
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gbo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
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ret = ttm_bo_validate(&gbo->bo, &gbo->placement, &ctx);
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if (ret < 0)
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return ret;
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return 0;
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}
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/**
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* drm_gem_vram_unpin() - Unpins a GEM VRAM object
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* @gbo: the GEM VRAM object
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*
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* Returns:
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* 0 on success, or
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* a negative error code otherwise.
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*/
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int drm_gem_vram_unpin(struct drm_gem_vram_object *gbo)
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{
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int ret;
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ret = ttm_bo_reserve(&gbo->bo, true, false, NULL);
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if (ret)
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return ret;
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ret = drm_gem_vram_unpin_locked(gbo);
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ttm_bo_unreserve(&gbo->bo);
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return ret;
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}
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EXPORT_SYMBOL(drm_gem_vram_unpin);
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static void *drm_gem_vram_kmap_locked(struct drm_gem_vram_object *gbo,
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bool map, bool *is_iomem)
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{
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int ret;
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struct ttm_bo_kmap_obj *kmap = &gbo->kmap;
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if (gbo->kmap_use_count > 0)
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goto out;
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if (kmap->virtual || !map)
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goto out;
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ret = ttm_bo_kmap(&gbo->bo, 0, gbo->bo.num_pages, kmap);
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if (ret)
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return ERR_PTR(ret);
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out:
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if (!kmap->virtual) {
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if (is_iomem)
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*is_iomem = false;
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return NULL; /* not mapped; don't increment ref */
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}
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++gbo->kmap_use_count;
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if (is_iomem)
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return ttm_kmap_obj_virtual(kmap, is_iomem);
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return kmap->virtual;
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}
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/**
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* drm_gem_vram_kmap() - Maps a GEM VRAM object into kernel address space
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* @gbo: the GEM VRAM object
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* @map: establish a mapping if necessary
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* @is_iomem: returns true if the mapped memory is I/O memory, or false \
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otherwise; can be NULL
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*
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* This function maps the buffer object into the kernel's address space
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* or returns the current mapping. If the parameter map is false, the
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* function only queries the current mapping, but does not establish a
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* new one.
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*
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* Returns:
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* The buffers virtual address if mapped, or
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* NULL if not mapped, or
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* an ERR_PTR()-encoded error code otherwise.
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*/
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void *drm_gem_vram_kmap(struct drm_gem_vram_object *gbo, bool map,
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bool *is_iomem)
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{
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int ret;
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void *virtual;
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ret = ttm_bo_reserve(&gbo->bo, true, false, NULL);
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if (ret)
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return ERR_PTR(ret);
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virtual = drm_gem_vram_kmap_locked(gbo, map, is_iomem);
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ttm_bo_unreserve(&gbo->bo);
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return virtual;
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}
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EXPORT_SYMBOL(drm_gem_vram_kmap);
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static void drm_gem_vram_kunmap_locked(struct drm_gem_vram_object *gbo)
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{
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if (WARN_ON_ONCE(!gbo->kmap_use_count))
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return;
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if (--gbo->kmap_use_count > 0)
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return;
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/*
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* Permanently mapping and unmapping buffers adds overhead from
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* updating the page tables and creates debugging output. Therefore,
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* we delay the actual unmap operation until the BO gets evicted
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* from memory. See drm_gem_vram_bo_driver_move_notify().
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*/
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}
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/**
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* drm_gem_vram_kunmap() - Unmaps a GEM VRAM object
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* @gbo: the GEM VRAM object
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*/
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void drm_gem_vram_kunmap(struct drm_gem_vram_object *gbo)
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{
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int ret;
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ret = ttm_bo_reserve(&gbo->bo, false, false, NULL);
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if (WARN_ONCE(ret, "ttm_bo_reserve_failed(): ret=%d\n", ret))
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return;
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drm_gem_vram_kunmap_locked(gbo);
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ttm_bo_unreserve(&gbo->bo);
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}
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EXPORT_SYMBOL(drm_gem_vram_kunmap);
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/**
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* drm_gem_vram_vmap() - Pins and maps a GEM VRAM object into kernel address
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* space
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* @gbo: The GEM VRAM object to map
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*
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* The vmap function pins a GEM VRAM object to its current location, either
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* system or video memory, and maps its buffer into kernel address space.
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* As pinned object cannot be relocated, you should avoid pinning objects
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* permanently. Call drm_gem_vram_vunmap() with the returned address to
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* unmap and unpin the GEM VRAM object.
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*
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* If you have special requirements for the pinning or mapping operations,
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* call drm_gem_vram_pin() and drm_gem_vram_kmap() directly.
|
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*
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* Returns:
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* The buffer's virtual address on success, or
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* an ERR_PTR()-encoded error code otherwise.
|
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*/
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void *drm_gem_vram_vmap(struct drm_gem_vram_object *gbo)
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{
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int ret;
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void *base;
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ret = ttm_bo_reserve(&gbo->bo, true, false, NULL);
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if (ret)
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return ERR_PTR(ret);
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|
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ret = drm_gem_vram_pin_locked(gbo, 0);
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if (ret)
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goto err_ttm_bo_unreserve;
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base = drm_gem_vram_kmap_locked(gbo, true, NULL);
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if (IS_ERR(base)) {
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ret = PTR_ERR(base);
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goto err_drm_gem_vram_unpin_locked;
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}
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|
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ttm_bo_unreserve(&gbo->bo);
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return base;
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|
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err_drm_gem_vram_unpin_locked:
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drm_gem_vram_unpin_locked(gbo);
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err_ttm_bo_unreserve:
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ttm_bo_unreserve(&gbo->bo);
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return ERR_PTR(ret);
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}
|
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EXPORT_SYMBOL(drm_gem_vram_vmap);
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|
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/**
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* drm_gem_vram_vunmap() - Unmaps and unpins a GEM VRAM object
|
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* @gbo: The GEM VRAM object to unmap
|
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* @vaddr: The mapping's base address as returned by drm_gem_vram_vmap()
|
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*
|
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* A call to drm_gem_vram_vunmap() unmaps and unpins a GEM VRAM buffer. See
|
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* the documentation for drm_gem_vram_vmap() for more information.
|
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*/
|
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void drm_gem_vram_vunmap(struct drm_gem_vram_object *gbo, void *vaddr)
|
|
{
|
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int ret;
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|
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ret = ttm_bo_reserve(&gbo->bo, false, false, NULL);
|
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if (WARN_ONCE(ret, "ttm_bo_reserve_failed(): ret=%d\n", ret))
|
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return;
|
|
|
|
drm_gem_vram_kunmap_locked(gbo);
|
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drm_gem_vram_unpin_locked(gbo);
|
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|
|
ttm_bo_unreserve(&gbo->bo);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vram_vunmap);
|
|
|
|
/**
|
|
* drm_gem_vram_fill_create_dumb() - \
|
|
Helper for implementing &struct drm_driver.dumb_create
|
|
* @file: the DRM file
|
|
* @dev: the DRM device
|
|
* @pg_align: the buffer's alignment in multiples of the page size
|
|
* @pitch_align: the scanline's alignment in powers of 2
|
|
* @args: the arguments as provided to \
|
|
&struct drm_driver.dumb_create
|
|
*
|
|
* This helper function fills &struct drm_mode_create_dumb, which is used
|
|
* by &struct drm_driver.dumb_create. Implementations of this interface
|
|
* should forwards their arguments to this helper, plus the driver-specific
|
|
* parameters.
|
|
*
|
|
* Returns:
|
|
* 0 on success, or
|
|
* a negative error code otherwise.
|
|
*/
|
|
int drm_gem_vram_fill_create_dumb(struct drm_file *file,
|
|
struct drm_device *dev,
|
|
unsigned long pg_align,
|
|
unsigned long pitch_align,
|
|
struct drm_mode_create_dumb *args)
|
|
{
|
|
size_t pitch, size;
|
|
struct drm_gem_vram_object *gbo;
|
|
int ret;
|
|
u32 handle;
|
|
|
|
pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
|
|
if (pitch_align) {
|
|
if (WARN_ON_ONCE(!is_power_of_2(pitch_align)))
|
|
return -EINVAL;
|
|
pitch = ALIGN(pitch, pitch_align);
|
|
}
|
|
size = pitch * args->height;
|
|
|
|
size = roundup(size, PAGE_SIZE);
|
|
if (!size)
|
|
return -EINVAL;
|
|
|
|
gbo = drm_gem_vram_create(dev, size, pg_align);
|
|
if (IS_ERR(gbo))
|
|
return PTR_ERR(gbo);
|
|
|
|
ret = drm_gem_handle_create(file, &gbo->bo.base, &handle);
|
|
if (ret)
|
|
goto err_drm_gem_object_put_unlocked;
|
|
|
|
drm_gem_object_put_unlocked(&gbo->bo.base);
|
|
|
|
args->pitch = pitch;
|
|
args->size = size;
|
|
args->handle = handle;
|
|
|
|
return 0;
|
|
|
|
err_drm_gem_object_put_unlocked:
|
|
drm_gem_object_put_unlocked(&gbo->bo.base);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vram_fill_create_dumb);
|
|
|
|
/*
|
|
* Helpers for struct ttm_bo_driver
|
|
*/
|
|
|
|
static bool drm_is_gem_vram(struct ttm_buffer_object *bo)
|
|
{
|
|
return (bo->destroy == ttm_buffer_object_destroy);
|
|
}
|
|
|
|
static void drm_gem_vram_bo_driver_evict_flags(struct drm_gem_vram_object *gbo,
|
|
struct ttm_placement *pl)
|
|
{
|
|
drm_gem_vram_placement(gbo, TTM_PL_FLAG_SYSTEM);
|
|
*pl = gbo->placement;
|
|
}
|
|
|
|
static void drm_gem_vram_bo_driver_move_notify(struct drm_gem_vram_object *gbo,
|
|
bool evict,
|
|
struct ttm_mem_reg *new_mem)
|
|
{
|
|
struct ttm_bo_kmap_obj *kmap = &gbo->kmap;
|
|
|
|
if (WARN_ON_ONCE(gbo->kmap_use_count))
|
|
return;
|
|
|
|
if (!kmap->virtual)
|
|
return;
|
|
ttm_bo_kunmap(kmap);
|
|
kmap->virtual = NULL;
|
|
}
|
|
|
|
/*
|
|
* Helpers for struct drm_gem_object_funcs
|
|
*/
|
|
|
|
/**
|
|
* drm_gem_vram_object_free() - \
|
|
Implements &struct drm_gem_object_funcs.free
|
|
* @gem: GEM object. Refers to &struct drm_gem_vram_object.gem
|
|
*/
|
|
static void drm_gem_vram_object_free(struct drm_gem_object *gem)
|
|
{
|
|
struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
|
|
|
|
drm_gem_vram_put(gbo);
|
|
}
|
|
|
|
/*
|
|
* Helpers for dump buffers
|
|
*/
|
|
|
|
/**
|
|
* drm_gem_vram_driver_create_dumb() - \
|
|
Implements &struct drm_driver.dumb_create
|
|
* @file: the DRM file
|
|
* @dev: the DRM device
|
|
* @args: the arguments as provided to \
|
|
&struct drm_driver.dumb_create
|
|
*
|
|
* This function requires the driver to use @drm_device.vram_mm for its
|
|
* instance of VRAM MM.
|
|
*
|
|
* Returns:
|
|
* 0 on success, or
|
|
* a negative error code otherwise.
|
|
*/
|
|
int drm_gem_vram_driver_dumb_create(struct drm_file *file,
|
|
struct drm_device *dev,
|
|
struct drm_mode_create_dumb *args)
|
|
{
|
|
if (WARN_ONCE(!dev->vram_mm, "VRAM MM not initialized"))
|
|
return -EINVAL;
|
|
|
|
return drm_gem_vram_fill_create_dumb(file, dev, 0, 0, args);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vram_driver_dumb_create);
|
|
|
|
/**
|
|
* drm_gem_vram_driver_dumb_mmap_offset() - \
|
|
Implements &struct drm_driver.dumb_mmap_offset
|
|
* @file: DRM file pointer.
|
|
* @dev: DRM device.
|
|
* @handle: GEM handle
|
|
* @offset: Returns the mapping's memory offset on success
|
|
*
|
|
* Returns:
|
|
* 0 on success, or
|
|
* a negative errno code otherwise.
|
|
*/
|
|
int drm_gem_vram_driver_dumb_mmap_offset(struct drm_file *file,
|
|
struct drm_device *dev,
|
|
uint32_t handle, uint64_t *offset)
|
|
{
|
|
struct drm_gem_object *gem;
|
|
struct drm_gem_vram_object *gbo;
|
|
|
|
gem = drm_gem_object_lookup(file, handle);
|
|
if (!gem)
|
|
return -ENOENT;
|
|
|
|
gbo = drm_gem_vram_of_gem(gem);
|
|
*offset = drm_gem_vram_mmap_offset(gbo);
|
|
|
|
drm_gem_object_put_unlocked(gem);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vram_driver_dumb_mmap_offset);
|
|
|
|
/*
|
|
* Helpers for struct drm_plane_helper_funcs
|
|
*/
|
|
|
|
/**
|
|
* drm_gem_vram_plane_helper_prepare_fb() - \
|
|
* Implements &struct drm_plane_helper_funcs.prepare_fb
|
|
* @plane: a DRM plane
|
|
* @new_state: the plane's new state
|
|
*
|
|
* During plane updates, this function pins the GEM VRAM
|
|
* objects of the plane's new framebuffer to VRAM. Call
|
|
* drm_gem_vram_plane_helper_cleanup_fb() to unpin them.
|
|
*
|
|
* Returns:
|
|
* 0 on success, or
|
|
* a negative errno code otherwise.
|
|
*/
|
|
int
|
|
drm_gem_vram_plane_helper_prepare_fb(struct drm_plane *plane,
|
|
struct drm_plane_state *new_state)
|
|
{
|
|
size_t i;
|
|
struct drm_gem_vram_object *gbo;
|
|
int ret;
|
|
|
|
if (!new_state->fb)
|
|
return 0;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(new_state->fb->obj); ++i) {
|
|
if (!new_state->fb->obj[i])
|
|
continue;
|
|
gbo = drm_gem_vram_of_gem(new_state->fb->obj[i]);
|
|
ret = drm_gem_vram_pin(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM);
|
|
if (ret)
|
|
goto err_drm_gem_vram_unpin;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_drm_gem_vram_unpin:
|
|
while (i) {
|
|
--i;
|
|
gbo = drm_gem_vram_of_gem(new_state->fb->obj[i]);
|
|
drm_gem_vram_unpin(gbo);
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vram_plane_helper_prepare_fb);
|
|
|
|
/**
|
|
* drm_gem_vram_plane_helper_cleanup_fb() - \
|
|
* Implements &struct drm_plane_helper_funcs.cleanup_fb
|
|
* @plane: a DRM plane
|
|
* @old_state: the plane's old state
|
|
*
|
|
* During plane updates, this function unpins the GEM VRAM
|
|
* objects of the plane's old framebuffer from VRAM. Complements
|
|
* drm_gem_vram_plane_helper_prepare_fb().
|
|
*/
|
|
void
|
|
drm_gem_vram_plane_helper_cleanup_fb(struct drm_plane *plane,
|
|
struct drm_plane_state *old_state)
|
|
{
|
|
size_t i;
|
|
struct drm_gem_vram_object *gbo;
|
|
|
|
if (!old_state->fb)
|
|
return;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(old_state->fb->obj); ++i) {
|
|
if (!old_state->fb->obj[i])
|
|
continue;
|
|
gbo = drm_gem_vram_of_gem(old_state->fb->obj[i]);
|
|
drm_gem_vram_unpin(gbo);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vram_plane_helper_cleanup_fb);
|
|
|
|
/*
|
|
* Helpers for struct drm_simple_display_pipe_funcs
|
|
*/
|
|
|
|
/**
|
|
* drm_gem_vram_simple_display_pipe_prepare_fb() - \
|
|
* Implements &struct drm_simple_display_pipe_funcs.prepare_fb
|
|
* @pipe: a simple display pipe
|
|
* @new_state: the plane's new state
|
|
*
|
|
* During plane updates, this function pins the GEM VRAM
|
|
* objects of the plane's new framebuffer to VRAM. Call
|
|
* drm_gem_vram_simple_display_pipe_cleanup_fb() to unpin them.
|
|
*
|
|
* Returns:
|
|
* 0 on success, or
|
|
* a negative errno code otherwise.
|
|
*/
|
|
int drm_gem_vram_simple_display_pipe_prepare_fb(
|
|
struct drm_simple_display_pipe *pipe,
|
|
struct drm_plane_state *new_state)
|
|
{
|
|
return drm_gem_vram_plane_helper_prepare_fb(&pipe->plane, new_state);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vram_simple_display_pipe_prepare_fb);
|
|
|
|
/**
|
|
* drm_gem_vram_simple_display_pipe_cleanup_fb() - \
|
|
* Implements &struct drm_simple_display_pipe_funcs.cleanup_fb
|
|
* @pipe: a simple display pipe
|
|
* @old_state: the plane's old state
|
|
*
|
|
* During plane updates, this function unpins the GEM VRAM
|
|
* objects of the plane's old framebuffer from VRAM. Complements
|
|
* drm_gem_vram_simple_display_pipe_prepare_fb().
|
|
*/
|
|
void drm_gem_vram_simple_display_pipe_cleanup_fb(
|
|
struct drm_simple_display_pipe *pipe,
|
|
struct drm_plane_state *old_state)
|
|
{
|
|
drm_gem_vram_plane_helper_cleanup_fb(&pipe->plane, old_state);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vram_simple_display_pipe_cleanup_fb);
|
|
|
|
/*
|
|
* PRIME helpers
|
|
*/
|
|
|
|
/**
|
|
* drm_gem_vram_object_pin() - \
|
|
Implements &struct drm_gem_object_funcs.pin
|
|
* @gem: The GEM object to pin
|
|
*
|
|
* Returns:
|
|
* 0 on success, or
|
|
* a negative errno code otherwise.
|
|
*/
|
|
static int drm_gem_vram_object_pin(struct drm_gem_object *gem)
|
|
{
|
|
struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
|
|
|
|
/* Fbdev console emulation is the use case of these PRIME
|
|
* helpers. This may involve updating a hardware buffer from
|
|
* a shadow FB. We pin the buffer to it's current location
|
|
* (either video RAM or system memory) to prevent it from
|
|
* being relocated during the update operation. If you require
|
|
* the buffer to be pinned to VRAM, implement a callback that
|
|
* sets the flags accordingly.
|
|
*/
|
|
return drm_gem_vram_pin(gbo, 0);
|
|
}
|
|
|
|
/**
|
|
* drm_gem_vram_object_unpin() - \
|
|
Implements &struct drm_gem_object_funcs.unpin
|
|
* @gem: The GEM object to unpin
|
|
*/
|
|
static void drm_gem_vram_object_unpin(struct drm_gem_object *gem)
|
|
{
|
|
struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
|
|
|
|
drm_gem_vram_unpin(gbo);
|
|
}
|
|
|
|
/**
|
|
* drm_gem_vram_object_vmap() - \
|
|
Implements &struct drm_gem_object_funcs.vmap
|
|
* @gem: The GEM object to map
|
|
*
|
|
* Returns:
|
|
* The buffers virtual address on success, or
|
|
* NULL otherwise.
|
|
*/
|
|
static void *drm_gem_vram_object_vmap(struct drm_gem_object *gem)
|
|
{
|
|
struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
|
|
void *base;
|
|
|
|
base = drm_gem_vram_vmap(gbo);
|
|
if (IS_ERR(base))
|
|
return NULL;
|
|
return base;
|
|
}
|
|
|
|
/**
|
|
* drm_gem_vram_object_vunmap() - \
|
|
Implements &struct drm_gem_object_funcs.vunmap
|
|
* @gem: The GEM object to unmap
|
|
* @vaddr: The mapping's base address
|
|
*/
|
|
static void drm_gem_vram_object_vunmap(struct drm_gem_object *gem,
|
|
void *vaddr)
|
|
{
|
|
struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
|
|
|
|
drm_gem_vram_vunmap(gbo, vaddr);
|
|
}
|
|
|
|
/*
|
|
* GEM object funcs
|
|
*/
|
|
|
|
static const struct drm_gem_object_funcs drm_gem_vram_object_funcs = {
|
|
.free = drm_gem_vram_object_free,
|
|
.pin = drm_gem_vram_object_pin,
|
|
.unpin = drm_gem_vram_object_unpin,
|
|
.vmap = drm_gem_vram_object_vmap,
|
|
.vunmap = drm_gem_vram_object_vunmap,
|
|
.mmap = drm_gem_ttm_mmap,
|
|
.print_info = drm_gem_ttm_print_info,
|
|
};
|
|
|
|
/*
|
|
* VRAM memory manager
|
|
*/
|
|
|
|
/*
|
|
* TTM TT
|
|
*/
|
|
|
|
static void backend_func_destroy(struct ttm_tt *tt)
|
|
{
|
|
ttm_tt_fini(tt);
|
|
kfree(tt);
|
|
}
|
|
|
|
static struct ttm_backend_func backend_func = {
|
|
.destroy = backend_func_destroy
|
|
};
|
|
|
|
/*
|
|
* TTM BO device
|
|
*/
|
|
|
|
static struct ttm_tt *bo_driver_ttm_tt_create(struct ttm_buffer_object *bo,
|
|
uint32_t page_flags)
|
|
{
|
|
struct ttm_tt *tt;
|
|
int ret;
|
|
|
|
tt = kzalloc(sizeof(*tt), GFP_KERNEL);
|
|
if (!tt)
|
|
return NULL;
|
|
|
|
tt->func = &backend_func;
|
|
|
|
ret = ttm_tt_init(tt, bo, page_flags);
|
|
if (ret < 0)
|
|
goto err_ttm_tt_init;
|
|
|
|
return tt;
|
|
|
|
err_ttm_tt_init:
|
|
kfree(tt);
|
|
return NULL;
|
|
}
|
|
|
|
static int bo_driver_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
|
|
struct ttm_mem_type_manager *man)
|
|
{
|
|
switch (type) {
|
|
case TTM_PL_SYSTEM:
|
|
man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
|
|
man->available_caching = TTM_PL_MASK_CACHING;
|
|
man->default_caching = TTM_PL_FLAG_CACHED;
|
|
break;
|
|
case TTM_PL_VRAM:
|
|
man->func = &ttm_bo_manager_func;
|
|
man->flags = TTM_MEMTYPE_FLAG_FIXED |
|
|
TTM_MEMTYPE_FLAG_MAPPABLE;
|
|
man->available_caching = TTM_PL_FLAG_UNCACHED |
|
|
TTM_PL_FLAG_WC;
|
|
man->default_caching = TTM_PL_FLAG_WC;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void bo_driver_evict_flags(struct ttm_buffer_object *bo,
|
|
struct ttm_placement *placement)
|
|
{
|
|
struct drm_gem_vram_object *gbo;
|
|
|
|
/* TTM may pass BOs that are not GEM VRAM BOs. */
|
|
if (!drm_is_gem_vram(bo))
|
|
return;
|
|
|
|
gbo = drm_gem_vram_of_bo(bo);
|
|
|
|
drm_gem_vram_bo_driver_evict_flags(gbo, placement);
|
|
}
|
|
|
|
static void bo_driver_move_notify(struct ttm_buffer_object *bo,
|
|
bool evict,
|
|
struct ttm_mem_reg *new_mem)
|
|
{
|
|
struct drm_gem_vram_object *gbo;
|
|
|
|
/* TTM may pass BOs that are not GEM VRAM BOs. */
|
|
if (!drm_is_gem_vram(bo))
|
|
return;
|
|
|
|
gbo = drm_gem_vram_of_bo(bo);
|
|
|
|
drm_gem_vram_bo_driver_move_notify(gbo, evict, new_mem);
|
|
}
|
|
|
|
static int bo_driver_io_mem_reserve(struct ttm_bo_device *bdev,
|
|
struct ttm_mem_reg *mem)
|
|
{
|
|
struct ttm_mem_type_manager *man = bdev->man + mem->mem_type;
|
|
struct drm_vram_mm *vmm = drm_vram_mm_of_bdev(bdev);
|
|
|
|
if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
|
|
return -EINVAL;
|
|
|
|
mem->bus.addr = NULL;
|
|
mem->bus.size = mem->num_pages << PAGE_SHIFT;
|
|
|
|
switch (mem->mem_type) {
|
|
case TTM_PL_SYSTEM: /* nothing to do */
|
|
mem->bus.offset = 0;
|
|
mem->bus.base = 0;
|
|
mem->bus.is_iomem = false;
|
|
break;
|
|
case TTM_PL_VRAM:
|
|
mem->bus.offset = mem->start << PAGE_SHIFT;
|
|
mem->bus.base = vmm->vram_base;
|
|
mem->bus.is_iomem = true;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void bo_driver_io_mem_free(struct ttm_bo_device *bdev,
|
|
struct ttm_mem_reg *mem)
|
|
{ }
|
|
|
|
static struct ttm_bo_driver bo_driver = {
|
|
.ttm_tt_create = bo_driver_ttm_tt_create,
|
|
.ttm_tt_populate = ttm_pool_populate,
|
|
.ttm_tt_unpopulate = ttm_pool_unpopulate,
|
|
.init_mem_type = bo_driver_init_mem_type,
|
|
.eviction_valuable = ttm_bo_eviction_valuable,
|
|
.evict_flags = bo_driver_evict_flags,
|
|
.move_notify = bo_driver_move_notify,
|
|
.io_mem_reserve = bo_driver_io_mem_reserve,
|
|
.io_mem_free = bo_driver_io_mem_free,
|
|
};
|
|
|
|
/*
|
|
* struct drm_vram_mm
|
|
*/
|
|
|
|
#if defined(CONFIG_DEBUG_FS)
|
|
static int drm_vram_mm_debugfs(struct seq_file *m, void *data)
|
|
{
|
|
struct drm_info_node *node = (struct drm_info_node *) m->private;
|
|
struct drm_vram_mm *vmm = node->minor->dev->vram_mm;
|
|
struct drm_mm *mm = vmm->bdev.man[TTM_PL_VRAM].priv;
|
|
struct drm_printer p = drm_seq_file_printer(m);
|
|
|
|
spin_lock(&ttm_bo_glob.lru_lock);
|
|
drm_mm_print(mm, &p);
|
|
spin_unlock(&ttm_bo_glob.lru_lock);
|
|
return 0;
|
|
}
|
|
|
|
static const struct drm_info_list drm_vram_mm_debugfs_list[] = {
|
|
{ "vram-mm", drm_vram_mm_debugfs, 0, NULL },
|
|
};
|
|
#endif
|
|
|
|
/**
|
|
* drm_vram_mm_debugfs_init() - Register VRAM MM debugfs file.
|
|
*
|
|
* @minor: drm minor device.
|
|
*
|
|
* Returns:
|
|
* 0 on success, or
|
|
* a negative error code otherwise.
|
|
*/
|
|
int drm_vram_mm_debugfs_init(struct drm_minor *minor)
|
|
{
|
|
int ret = 0;
|
|
|
|
#if defined(CONFIG_DEBUG_FS)
|
|
ret = drm_debugfs_create_files(drm_vram_mm_debugfs_list,
|
|
ARRAY_SIZE(drm_vram_mm_debugfs_list),
|
|
minor->debugfs_root, minor);
|
|
#endif
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_vram_mm_debugfs_init);
|
|
|
|
static int drm_vram_mm_init(struct drm_vram_mm *vmm, struct drm_device *dev,
|
|
uint64_t vram_base, size_t vram_size)
|
|
{
|
|
int ret;
|
|
|
|
vmm->vram_base = vram_base;
|
|
vmm->vram_size = vram_size;
|
|
|
|
ret = ttm_bo_device_init(&vmm->bdev, &bo_driver,
|
|
dev->anon_inode->i_mapping,
|
|
dev->vma_offset_manager,
|
|
true);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ttm_bo_init_mm(&vmm->bdev, TTM_PL_VRAM, vram_size >> PAGE_SHIFT);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void drm_vram_mm_cleanup(struct drm_vram_mm *vmm)
|
|
{
|
|
ttm_bo_device_release(&vmm->bdev);
|
|
}
|
|
|
|
/*
|
|
* Helpers for integration with struct drm_device
|
|
*/
|
|
|
|
/**
|
|
* drm_vram_helper_alloc_mm - Allocates a device's instance of \
|
|
&struct drm_vram_mm
|
|
* @dev: the DRM device
|
|
* @vram_base: the base address of the video memory
|
|
* @vram_size: the size of the video memory in bytes
|
|
*
|
|
* Returns:
|
|
* The new instance of &struct drm_vram_mm on success, or
|
|
* an ERR_PTR()-encoded errno code otherwise.
|
|
*/
|
|
struct drm_vram_mm *drm_vram_helper_alloc_mm(
|
|
struct drm_device *dev, uint64_t vram_base, size_t vram_size)
|
|
{
|
|
int ret;
|
|
|
|
if (WARN_ON(dev->vram_mm))
|
|
return dev->vram_mm;
|
|
|
|
dev->vram_mm = kzalloc(sizeof(*dev->vram_mm), GFP_KERNEL);
|
|
if (!dev->vram_mm)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = drm_vram_mm_init(dev->vram_mm, dev, vram_base, vram_size);
|
|
if (ret)
|
|
goto err_kfree;
|
|
|
|
return dev->vram_mm;
|
|
|
|
err_kfree:
|
|
kfree(dev->vram_mm);
|
|
dev->vram_mm = NULL;
|
|
return ERR_PTR(ret);
|
|
}
|
|
EXPORT_SYMBOL(drm_vram_helper_alloc_mm);
|
|
|
|
/**
|
|
* drm_vram_helper_release_mm - Releases a device's instance of \
|
|
&struct drm_vram_mm
|
|
* @dev: the DRM device
|
|
*/
|
|
void drm_vram_helper_release_mm(struct drm_device *dev)
|
|
{
|
|
if (!dev->vram_mm)
|
|
return;
|
|
|
|
drm_vram_mm_cleanup(dev->vram_mm);
|
|
kfree(dev->vram_mm);
|
|
dev->vram_mm = NULL;
|
|
}
|
|
EXPORT_SYMBOL(drm_vram_helper_release_mm);
|