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![Matthew Auld](/assets/img/avatar_default.png)
Intended for upstream testing so that we can still exercise the LMEM plumbing and !i915_ggtt_has_aperture paths. Smoke tested on Skull Canyon device. This works by allocating an intel_memory_region for a reserved portion of system memory, which we treat like LMEM. For the LMEMBAR we steal the aperture and 1:1 it map to the stolen region. To enable simply set the i915 modparam fake_lmem_start= on the kernel cmdline with the start of reserved region(see memmap=). The size of the region we can use is determined by the size of the mappable aperture, so the size of reserved region should be >= mappable_end. For now we only enable for the selftests. Depends on CONFIG_DRM_I915_UNSTABLE being enabled. eg. memmap=2G$16G i915.fake_lmem_start=0x400000000 v2: make fake_lmem_start an i915 modparam Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com> Cc: Arkadiusz Hiler <arkadiusz.hiler@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20191030173320.8850-1-matthew.auld@intel.com
272 lines
5.9 KiB
C
272 lines
5.9 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2019 Intel Corporation
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*/
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#include "intel_memory_region.h"
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#include "i915_drv.h"
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/* XXX: Hysterical raisins. BIT(inst) needs to just be (inst) at some point. */
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#define REGION_MAP(type, inst) \
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BIT((type) + INTEL_MEMORY_TYPE_SHIFT) | BIT(inst)
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const u32 intel_region_map[] = {
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[INTEL_REGION_SMEM] = REGION_MAP(INTEL_MEMORY_SYSTEM, 0),
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[INTEL_REGION_LMEM] = REGION_MAP(INTEL_MEMORY_LOCAL, 0),
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[INTEL_REGION_STOLEN] = REGION_MAP(INTEL_MEMORY_STOLEN, 0),
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};
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static u64
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intel_memory_region_free_pages(struct intel_memory_region *mem,
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struct list_head *blocks)
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{
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struct i915_buddy_block *block, *on;
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u64 size = 0;
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list_for_each_entry_safe(block, on, blocks, link) {
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size += i915_buddy_block_size(&mem->mm, block);
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i915_buddy_free(&mem->mm, block);
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}
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INIT_LIST_HEAD(blocks);
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return size;
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}
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void
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__intel_memory_region_put_pages_buddy(struct intel_memory_region *mem,
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struct list_head *blocks)
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{
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mutex_lock(&mem->mm_lock);
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intel_memory_region_free_pages(mem, blocks);
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mutex_unlock(&mem->mm_lock);
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}
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void
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__intel_memory_region_put_block_buddy(struct i915_buddy_block *block)
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{
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struct list_head blocks;
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INIT_LIST_HEAD(&blocks);
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list_add(&block->link, &blocks);
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__intel_memory_region_put_pages_buddy(block->private, &blocks);
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}
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int
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__intel_memory_region_get_pages_buddy(struct intel_memory_region *mem,
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resource_size_t size,
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unsigned int flags,
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struct list_head *blocks)
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{
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unsigned int min_order = 0;
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unsigned long n_pages;
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GEM_BUG_ON(!IS_ALIGNED(size, mem->mm.chunk_size));
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GEM_BUG_ON(!list_empty(blocks));
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if (flags & I915_ALLOC_MIN_PAGE_SIZE) {
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min_order = ilog2(mem->min_page_size) -
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ilog2(mem->mm.chunk_size);
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}
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if (flags & I915_ALLOC_CONTIGUOUS) {
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size = roundup_pow_of_two(size);
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min_order = ilog2(size) - ilog2(mem->mm.chunk_size);
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}
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n_pages = size >> ilog2(mem->mm.chunk_size);
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mutex_lock(&mem->mm_lock);
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do {
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struct i915_buddy_block *block;
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unsigned int order;
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order = fls(n_pages) - 1;
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GEM_BUG_ON(order > mem->mm.max_order);
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GEM_BUG_ON(order < min_order);
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do {
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block = i915_buddy_alloc(&mem->mm, order);
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if (!IS_ERR(block))
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break;
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if (order-- == min_order)
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goto err_free_blocks;
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} while (1);
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n_pages -= BIT(order);
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block->private = mem;
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list_add(&block->link, blocks);
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if (!n_pages)
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break;
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} while (1);
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mutex_unlock(&mem->mm_lock);
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return 0;
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err_free_blocks:
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intel_memory_region_free_pages(mem, blocks);
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mutex_unlock(&mem->mm_lock);
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return -ENXIO;
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}
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struct i915_buddy_block *
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__intel_memory_region_get_block_buddy(struct intel_memory_region *mem,
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resource_size_t size,
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unsigned int flags)
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{
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struct i915_buddy_block *block;
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LIST_HEAD(blocks);
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int ret;
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ret = __intel_memory_region_get_pages_buddy(mem, size, flags, &blocks);
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if (ret)
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return ERR_PTR(ret);
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block = list_first_entry(&blocks, typeof(*block), link);
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list_del_init(&block->link);
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return block;
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}
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int intel_memory_region_init_buddy(struct intel_memory_region *mem)
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{
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return i915_buddy_init(&mem->mm, resource_size(&mem->region),
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PAGE_SIZE);
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}
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void intel_memory_region_release_buddy(struct intel_memory_region *mem)
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{
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i915_buddy_fini(&mem->mm);
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}
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struct intel_memory_region *
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intel_memory_region_create(struct drm_i915_private *i915,
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resource_size_t start,
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resource_size_t size,
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resource_size_t min_page_size,
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resource_size_t io_start,
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const struct intel_memory_region_ops *ops)
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{
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struct intel_memory_region *mem;
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int err;
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mem = kzalloc(sizeof(*mem), GFP_KERNEL);
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if (!mem)
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return ERR_PTR(-ENOMEM);
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mem->i915 = i915;
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mem->region = (struct resource)DEFINE_RES_MEM(start, size);
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mem->io_start = io_start;
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mem->min_page_size = min_page_size;
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mem->ops = ops;
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mutex_init(&mem->objects.lock);
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INIT_LIST_HEAD(&mem->objects.list);
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INIT_LIST_HEAD(&mem->objects.purgeable);
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mutex_init(&mem->mm_lock);
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if (ops->init) {
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err = ops->init(mem);
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if (err)
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goto err_free;
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}
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kref_init(&mem->kref);
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return mem;
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err_free:
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kfree(mem);
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return ERR_PTR(err);
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}
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static void __intel_memory_region_destroy(struct kref *kref)
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{
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struct intel_memory_region *mem =
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container_of(kref, typeof(*mem), kref);
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if (mem->ops->release)
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mem->ops->release(mem);
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mutex_destroy(&mem->mm_lock);
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mutex_destroy(&mem->objects.lock);
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kfree(mem);
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}
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struct intel_memory_region *
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intel_memory_region_get(struct intel_memory_region *mem)
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{
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kref_get(&mem->kref);
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return mem;
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}
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void intel_memory_region_put(struct intel_memory_region *mem)
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{
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kref_put(&mem->kref, __intel_memory_region_destroy);
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}
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/* Global memory region registration -- only slight layer inversions! */
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int intel_memory_regions_hw_probe(struct drm_i915_private *i915)
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{
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int err, i;
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for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) {
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struct intel_memory_region *mem = ERR_PTR(-ENODEV);
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u32 type;
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if (!HAS_REGION(i915, BIT(i)))
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continue;
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type = MEMORY_TYPE_FROM_REGION(intel_region_map[i]);
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switch (type) {
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case INTEL_MEMORY_SYSTEM:
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mem = i915_gem_shmem_setup(i915);
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break;
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case INTEL_MEMORY_STOLEN:
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mem = i915_gem_stolen_setup(i915);
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break;
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case INTEL_MEMORY_LOCAL:
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mem = intel_setup_fake_lmem(i915);
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break;
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}
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if (IS_ERR(mem)) {
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err = PTR_ERR(mem);
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DRM_ERROR("Failed to setup region(%d) type=%d\n", err, type);
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goto out_cleanup;
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}
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mem->id = intel_region_map[i];
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mem->type = type;
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mem->instance = MEMORY_INSTANCE_FROM_REGION(intel_region_map[i]);
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i915->mm.regions[i] = mem;
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}
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return 0;
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out_cleanup:
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intel_memory_regions_driver_release(i915);
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return err;
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}
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void intel_memory_regions_driver_release(struct drm_i915_private *i915)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) {
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struct intel_memory_region *region =
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fetch_and_zero(&i915->mm.regions[i]);
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if (region)
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intel_memory_region_put(region);
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}
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}
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#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
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#include "selftests/intel_memory_region.c"
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#include "selftests/mock_region.c"
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#endif
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