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// SPDX-License-Identifier: MIT
/*
* Copyright © 2019 Intel Corporation
*/
#include "i915_drv.h"
#include "intel_memory_region.h"
#include "gem/i915_gem_lmem.h"
#include "gem/i915_gem_region.h"
#include "intel_region_lmem.h"
static int init_fake_lmem_bar(struct intel_memory_region *mem)
{
struct drm_i915_private *i915 = mem->i915;
struct i915_ggtt *ggtt = &i915->ggtt;
unsigned long n;
int ret;
/* We want to 1:1 map the mappable aperture to our reserved region */
mem->fake_mappable.start = 0;
mem->fake_mappable.size = resource_size(&mem->region);
mem->fake_mappable.color = I915_COLOR_UNEVICTABLE;
ret = drm_mm_reserve_node(&ggtt->vm.mm, &mem->fake_mappable);
if (ret)
return ret;
mem->remap_addr = dma_map_resource(&i915->drm.pdev->dev,
mem->region.start,
mem->fake_mappable.size,
PCI_DMA_BIDIRECTIONAL,
DMA_ATTR_FORCE_CONTIGUOUS);
if (dma_mapping_error(&i915->drm.pdev->dev, mem->remap_addr)) {
drm_mm_remove_node(&mem->fake_mappable);
return -EINVAL;
}
for (n = 0; n < mem->fake_mappable.size >> PAGE_SHIFT; ++n) {
ggtt->vm.insert_page(&ggtt->vm,
mem->remap_addr + (n << PAGE_SHIFT),
n << PAGE_SHIFT,
I915_CACHE_NONE, 0);
}
mem->region = (struct resource)DEFINE_RES_MEM(mem->remap_addr,
mem->fake_mappable.size);
return 0;
}
static void release_fake_lmem_bar(struct intel_memory_region *mem)
{
if (!drm_mm_node_allocated(&mem->fake_mappable))
return;
drm_mm_remove_node(&mem->fake_mappable);
dma_unmap_resource(&mem->i915->drm.pdev->dev,
mem->remap_addr,
mem->fake_mappable.size,
PCI_DMA_BIDIRECTIONAL,
DMA_ATTR_FORCE_CONTIGUOUS);
}
static void
region_lmem_release(struct intel_memory_region *mem)
{
release_fake_lmem_bar(mem);
io_mapping_fini(&mem->iomap);
intel_memory_region_release_buddy(mem);
}
static int
region_lmem_init(struct intel_memory_region *mem)
{
int ret;
if (i915_modparams.fake_lmem_start) {
ret = init_fake_lmem_bar(mem);
GEM_BUG_ON(ret);
}
if (!io_mapping_init_wc(&mem->iomap,
mem->io_start,
resource_size(&mem->region)))
return -EIO;
ret = intel_memory_region_init_buddy(mem);
if (ret)
io_mapping_fini(&mem->iomap);
intel_memory_region_set_name(mem, "local");
return ret;
}
const struct intel_memory_region_ops intel_region_lmem_ops = {
.init = region_lmem_init,
.release = region_lmem_release,
.create_object = __i915_gem_lmem_object_create,
};
struct intel_memory_region *
intel_setup_fake_lmem(struct drm_i915_private *i915)
{
struct pci_dev *pdev = i915->drm.pdev;
struct intel_memory_region *mem;
resource_size_t mappable_end;
resource_size_t io_start;
resource_size_t start;
GEM_BUG_ON(i915_ggtt_has_aperture(&i915->ggtt));
GEM_BUG_ON(!i915_modparams.fake_lmem_start);
/* Your mappable aperture belongs to me now! */
mappable_end = pci_resource_len(pdev, 2);
io_start = pci_resource_start(pdev, 2),
start = i915_modparams.fake_lmem_start;
mem = intel_memory_region_create(i915,
start,
mappable_end,
PAGE_SIZE,
io_start,
&intel_region_lmem_ops);
if (!IS_ERR(mem)) {
drm_info(&i915->drm, "Intel graphics fake LMEM: %pR\n",
&mem->region);
drm_info(&i915->drm,
"Intel graphics fake LMEM IO start: %llx\n",
(u64)mem->io_start);
drm_info(&i915->drm, "Intel graphics fake LMEM size: %llx\n",
(u64)resource_size(&mem->region));
}
return mem;
}
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