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1629224324
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
132 lines
3.2 KiB
C
132 lines
3.2 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 "i915_drv.h"
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#include "intel_memory_region.h"
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#include "gem/i915_gem_lmem.h"
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#include "gem/i915_gem_region.h"
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#include "intel_region_lmem.h"
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static int init_fake_lmem_bar(struct intel_memory_region *mem)
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{
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struct drm_i915_private *i915 = mem->i915;
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struct i915_ggtt *ggtt = &i915->ggtt;
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unsigned long n;
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int ret;
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/* We want to 1:1 map the mappable aperture to our reserved region */
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mem->fake_mappable.start = 0;
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mem->fake_mappable.size = resource_size(&mem->region);
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mem->fake_mappable.color = I915_COLOR_UNEVICTABLE;
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ret = drm_mm_reserve_node(&ggtt->vm.mm, &mem->fake_mappable);
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if (ret)
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return ret;
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mem->remap_addr = dma_map_resource(&i915->drm.pdev->dev,
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mem->region.start,
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mem->fake_mappable.size,
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PCI_DMA_BIDIRECTIONAL,
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DMA_ATTR_FORCE_CONTIGUOUS);
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if (dma_mapping_error(&i915->drm.pdev->dev, mem->remap_addr)) {
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drm_mm_remove_node(&mem->fake_mappable);
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return -EINVAL;
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}
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for (n = 0; n < mem->fake_mappable.size >> PAGE_SHIFT; ++n) {
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ggtt->vm.insert_page(&ggtt->vm,
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mem->remap_addr + (n << PAGE_SHIFT),
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n << PAGE_SHIFT,
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I915_CACHE_NONE, 0);
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}
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mem->region = (struct resource)DEFINE_RES_MEM(mem->remap_addr,
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mem->fake_mappable.size);
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return 0;
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}
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static void release_fake_lmem_bar(struct intel_memory_region *mem)
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{
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if (drm_mm_node_allocated(&mem->fake_mappable))
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drm_mm_remove_node(&mem->fake_mappable);
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dma_unmap_resource(&mem->i915->drm.pdev->dev,
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mem->remap_addr,
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mem->fake_mappable.size,
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PCI_DMA_BIDIRECTIONAL,
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DMA_ATTR_FORCE_CONTIGUOUS);
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}
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static void
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region_lmem_release(struct intel_memory_region *mem)
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{
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release_fake_lmem_bar(mem);
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io_mapping_fini(&mem->iomap);
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intel_memory_region_release_buddy(mem);
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}
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static int
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region_lmem_init(struct intel_memory_region *mem)
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{
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int ret;
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if (i915_modparams.fake_lmem_start) {
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ret = init_fake_lmem_bar(mem);
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GEM_BUG_ON(ret);
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}
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if (!io_mapping_init_wc(&mem->iomap,
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mem->io_start,
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resource_size(&mem->region)))
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return -EIO;
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ret = intel_memory_region_init_buddy(mem);
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if (ret)
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io_mapping_fini(&mem->iomap);
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return ret;
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}
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const struct intel_memory_region_ops intel_region_lmem_ops = {
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.init = region_lmem_init,
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.release = region_lmem_release,
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.create_object = __i915_gem_lmem_object_create,
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};
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struct intel_memory_region *
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intel_setup_fake_lmem(struct drm_i915_private *i915)
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{
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struct pci_dev *pdev = i915->drm.pdev;
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struct intel_memory_region *mem;
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resource_size_t mappable_end;
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resource_size_t io_start;
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resource_size_t start;
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GEM_BUG_ON(i915_ggtt_has_aperture(&i915->ggtt));
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GEM_BUG_ON(!i915_modparams.fake_lmem_start);
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/* Your mappable aperture belongs to me now! */
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mappable_end = pci_resource_len(pdev, 2);
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io_start = pci_resource_start(pdev, 2),
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start = i915_modparams.fake_lmem_start;
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mem = intel_memory_region_create(i915,
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start,
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mappable_end,
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PAGE_SIZE,
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io_start,
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&intel_region_lmem_ops);
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if (!IS_ERR(mem)) {
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DRM_INFO("Intel graphics fake LMEM: %pR\n", &mem->region);
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DRM_INFO("Intel graphics fake LMEM IO start: %llx\n",
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(u64)mem->io_start);
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DRM_INFO("Intel graphics fake LMEM size: %llx\n",
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(u64)resource_size(&mem->region));
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}
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return mem;
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}
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