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![Thomas Zimmermann](/assets/img/avatar_default.png)
The GEM VRAM functions with kmap-object argument are not required any longer. Remove them. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190613073041.29350-10-tzimmermann@suse.de
641 lines
16 KiB
C
641 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <drm/drm_gem_vram_helper.h>
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#include <drm/drm_device.h>
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#include <drm/drm_mode.h>
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#include <drm/drm_prime.h>
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#include <drm/drm_vram_mm_helper.h>
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#include <drm/ttm/ttm_page_alloc.h>
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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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/*
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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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drm_gem_object_release(&gbo->gem);
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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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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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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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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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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 ttm_bo_device *bdev,
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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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bool interruptible)
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{
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int ret;
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size_t acc_size;
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ret = drm_gem_object_init(dev, &gbo->gem, 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, interruptible, 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->gem);
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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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* @bdev: the TTM BO device backing the object
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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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* @interruptible: sleep interruptible if waiting for memory
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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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struct ttm_bo_device *bdev,
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size_t size,
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unsigned long pg_align,
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bool interruptible)
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{
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struct drm_gem_vram_object *gbo;
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int ret;
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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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ret = drm_gem_vram_init(dev, bdev, gbo, size, pg_align, interruptible);
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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.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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/**
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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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* 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 i, ret;
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struct ttm_operation_ctx ctx = { false, false };
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ret = ttm_bo_reserve(&gbo->bo, true, false, NULL);
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if (ret < 0)
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return ret;
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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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goto err_ttm_bo_unreserve;
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out:
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++gbo->pin_count;
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ttm_bo_unreserve(&gbo->bo);
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return 0;
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err_ttm_bo_unreserve:
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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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/**
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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 i, ret;
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struct ttm_operation_ctx ctx = { false, false };
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ret = ttm_bo_reserve(&gbo->bo, true, false, NULL);
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if (ret < 0)
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return ret;
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if (WARN_ON_ONCE(!gbo->pin_count))
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goto out;
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--gbo->pin_count;
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if (gbo->pin_count)
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goto out;
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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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goto err_ttm_bo_unreserve;
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out:
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ttm_bo_unreserve(&gbo->bo);
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return 0;
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err_ttm_bo_unreserve:
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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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/**
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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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struct ttm_bo_kmap_obj *kmap = &gbo->kmap;
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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 (!is_iomem)
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return kmap->virtual;
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if (!kmap->virtual) {
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*is_iomem = false;
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return NULL;
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}
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return ttm_kmap_obj_virtual(kmap, is_iomem);
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}
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EXPORT_SYMBOL(drm_gem_vram_kmap);
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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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struct ttm_bo_kmap_obj *kmap = &gbo->kmap;
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if (!kmap->virtual)
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return;
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ttm_bo_kunmap(kmap);
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kmap->virtual = NULL;
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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_fill_create_dumb() - \
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Helper for implementing &struct drm_driver.dumb_create
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* @file: the DRM file
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* @dev: the DRM device
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* @bdev: the TTM BO device managing the buffer object
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* @pg_align: the buffer's alignment in multiples of the page size
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* @interruptible: sleep interruptible if waiting for memory
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* @args: the arguments as provided to \
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&struct drm_driver.dumb_create
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*
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* This helper function fills &struct drm_mode_create_dumb, which is used
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* by &struct drm_driver.dumb_create. Implementations of this interface
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* should forwards their arguments to this helper, plus the driver-specific
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* parameters.
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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_fill_create_dumb(struct drm_file *file,
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struct drm_device *dev,
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struct ttm_bo_device *bdev,
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unsigned long pg_align,
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bool interruptible,
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struct drm_mode_create_dumb *args)
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{
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size_t pitch, size;
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struct drm_gem_vram_object *gbo;
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int ret;
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u32 handle;
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pitch = args->width * ((args->bpp + 7) / 8);
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size = pitch * args->height;
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size = roundup(size, PAGE_SIZE);
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if (!size)
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return -EINVAL;
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gbo = drm_gem_vram_create(dev, bdev, size, pg_align, interruptible);
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if (IS_ERR(gbo))
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return PTR_ERR(gbo);
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ret = drm_gem_handle_create(file, &gbo->gem, &handle);
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if (ret)
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goto err_drm_gem_object_put_unlocked;
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drm_gem_object_put_unlocked(&gbo->gem);
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args->pitch = pitch;
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args->size = size;
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args->handle = handle;
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return 0;
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err_drm_gem_object_put_unlocked:
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drm_gem_object_put_unlocked(&gbo->gem);
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return ret;
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}
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EXPORT_SYMBOL(drm_gem_vram_fill_create_dumb);
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/*
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* Helpers for struct ttm_bo_driver
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*/
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static bool drm_is_gem_vram(struct ttm_buffer_object *bo)
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{
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return (bo->destroy == ttm_buffer_object_destroy);
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}
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/**
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* drm_gem_vram_bo_driver_evict_flags() - \
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Implements &struct ttm_bo_driver.evict_flags
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* @bo: TTM buffer object. Refers to &struct drm_gem_vram_object.bo
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* @pl: TTM placement information.
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*/
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void drm_gem_vram_bo_driver_evict_flags(struct ttm_buffer_object *bo,
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struct ttm_placement *pl)
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{
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struct drm_gem_vram_object *gbo;
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/* TTM may pass BOs that are not GEM VRAM BOs. */
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if (!drm_is_gem_vram(bo))
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return;
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gbo = drm_gem_vram_of_bo(bo);
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drm_gem_vram_placement(gbo, TTM_PL_FLAG_SYSTEM);
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*pl = gbo->placement;
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}
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EXPORT_SYMBOL(drm_gem_vram_bo_driver_evict_flags);
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/**
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* drm_gem_vram_bo_driver_verify_access() - \
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Implements &struct ttm_bo_driver.verify_access
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* @bo: TTM buffer object. Refers to &struct drm_gem_vram_object.bo
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* @filp: File pointer.
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*
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* Returns:
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* 0 on success, or
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* a negative errno code otherwise.
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*/
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int drm_gem_vram_bo_driver_verify_access(struct ttm_buffer_object *bo,
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struct file *filp)
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{
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struct drm_gem_vram_object *gbo = drm_gem_vram_of_bo(bo);
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return drm_vma_node_verify_access(&gbo->gem.vma_node,
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filp->private_data);
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}
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EXPORT_SYMBOL(drm_gem_vram_bo_driver_verify_access);
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/*
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* drm_gem_vram_mm_funcs - Functions for &struct drm_vram_mm
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*
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* Most users of @struct drm_gem_vram_object will also use
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* @struct drm_vram_mm. This instance of &struct drm_vram_mm_funcs
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* can be used to connect both.
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*/
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const struct drm_vram_mm_funcs drm_gem_vram_mm_funcs = {
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.evict_flags = drm_gem_vram_bo_driver_evict_flags,
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.verify_access = drm_gem_vram_bo_driver_verify_access
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};
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EXPORT_SYMBOL(drm_gem_vram_mm_funcs);
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/*
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* Helpers for struct drm_driver
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*/
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/**
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* drm_gem_vram_driver_gem_free_object_unlocked() - \
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Implements &struct drm_driver.gem_free_object_unlocked
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* @gem: GEM object. Refers to &struct drm_gem_vram_object.gem
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*/
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void drm_gem_vram_driver_gem_free_object_unlocked(struct drm_gem_object *gem)
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{
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struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
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drm_gem_vram_put(gbo);
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}
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EXPORT_SYMBOL(drm_gem_vram_driver_gem_free_object_unlocked);
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/**
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* drm_gem_vram_driver_create_dumb() - \
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Implements &struct drm_driver.dumb_create
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* @file: the DRM file
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* @dev: the DRM device
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* @args: the arguments as provided to \
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&struct drm_driver.dumb_create
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*
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* This function requires the driver to use @drm_device.vram_mm for its
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* instance of VRAM MM.
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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_driver_dumb_create(struct drm_file *file,
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struct drm_device *dev,
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struct drm_mode_create_dumb *args)
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{
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if (WARN_ONCE(!dev->vram_mm, "VRAM MM not initialized"))
|
|
return -EINVAL;
|
|
|
|
return drm_gem_vram_fill_create_dumb(file, dev, &dev->vram_mm->bdev, 0,
|
|
false, 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);
|
|
|
|
/*
|
|
* PRIME helpers for struct drm_driver
|
|
*/
|
|
|
|
/**
|
|
* drm_gem_vram_driver_gem_prime_pin() - \
|
|
Implements &struct drm_driver.gem_prime_pin
|
|
* @gem: The GEM object to pin
|
|
*
|
|
* Returns:
|
|
* 0 on success, or
|
|
* a negative errno code otherwise.
|
|
*/
|
|
int drm_gem_vram_driver_gem_prime_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);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_pin);
|
|
|
|
/**
|
|
* drm_gem_vram_driver_gem_prime_unpin() - \
|
|
Implements &struct drm_driver.gem_prime_unpin
|
|
* @gem: The GEM object to unpin
|
|
*/
|
|
void drm_gem_vram_driver_gem_prime_unpin(struct drm_gem_object *gem)
|
|
{
|
|
struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
|
|
|
|
drm_gem_vram_unpin(gbo);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_unpin);
|
|
|
|
/**
|
|
* drm_gem_vram_driver_gem_prime_vmap() - \
|
|
Implements &struct drm_driver.gem_prime_vmap
|
|
* @gem: The GEM object to map
|
|
*
|
|
* Returns:
|
|
* The buffers virtual address on success, or
|
|
* NULL otherwise.
|
|
*/
|
|
void *drm_gem_vram_driver_gem_prime_vmap(struct drm_gem_object *gem)
|
|
{
|
|
struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
|
|
int ret;
|
|
void *base;
|
|
|
|
ret = drm_gem_vram_pin(gbo, 0);
|
|
if (ret)
|
|
return NULL;
|
|
base = drm_gem_vram_kmap(gbo, true, NULL);
|
|
if (IS_ERR(base)) {
|
|
drm_gem_vram_unpin(gbo);
|
|
return NULL;
|
|
}
|
|
return base;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_vmap);
|
|
|
|
/**
|
|
* drm_gem_vram_driver_gem_prime_vunmap() - \
|
|
Implements &struct drm_driver.gem_prime_vunmap
|
|
* @gem: The GEM object to unmap
|
|
* @vaddr: The mapping's base address
|
|
*/
|
|
void drm_gem_vram_driver_gem_prime_vunmap(struct drm_gem_object *gem,
|
|
void *vaddr)
|
|
{
|
|
struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
|
|
|
|
drm_gem_vram_kunmap(gbo);
|
|
drm_gem_vram_unpin(gbo);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_vunmap);
|
|
|
|
/**
|
|
* drm_gem_vram_driver_gem_prime_mmap() - \
|
|
Implements &struct drm_driver.gem_prime_mmap
|
|
* @gem: The GEM object to map
|
|
* @vma: The VMA describing the mapping
|
|
*
|
|
* Returns:
|
|
* 0 on success, or
|
|
* a negative errno code otherwise.
|
|
*/
|
|
int drm_gem_vram_driver_gem_prime_mmap(struct drm_gem_object *gem,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
|
|
|
|
gbo->gem.vma_node.vm_node.start = gbo->bo.vma_node.vm_node.start;
|
|
return drm_gem_prime_mmap(gem, vma);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_vram_driver_gem_prime_mmap);
|