mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-22 19:03:28 +07:00
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
133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
// 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))
|
|
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);
|
|
|
|
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("Intel graphics fake LMEM: %pR\n", &mem->region);
|
|
DRM_INFO("Intel graphics fake LMEM IO start: %llx\n",
|
|
(u64)mem->io_start);
|
|
DRM_INFO("Intel graphics fake LMEM size: %llx\n",
|
|
(u64)resource_size(&mem->region));
|
|
}
|
|
|
|
return mem;
|
|
}
|