drm/i915/lmem: add the fake lmem region

[linux-2.6-microblaze.git] / drivers / gpu / drm / i915 / intel_region_lmem.c

diff --git a/drivers/gpu/drm/i915/intel_region_lmem.c b/drivers/gpu/drm/i915/intel_region_lmem.c
index 9a351af..5831180 100644 (file)
--- a/drivers/gpu/drm/i915/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/intel_region_lmem.c
@@ -9,9 +9,62 @@
 #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);
 }
@@ -21,6 +74,11 @@ 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)))
@@ -38,3 +96,37 @@ const struct intel_memory_region_ops intel_region_lmem_ops = {
        .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;
+}