Orange Pi5 kernel

// 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 (mem->i915->params.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->params.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->params.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;
}