linux/drivers/gpu/drm/i915/i915_gem_stolen.c
Daniel Vetter fcc9fe1a5a drm/i915: restrict vt-d stolen memory workaround to pre-gen8
We want future generations to at least attempt to use all features, so
restrict the stolen memory disabling when vt-d is enabled to the
latest generation we have reports for. Which is a HSW per the original
report.

Also once we get a bit a hold of some of the mysterious framebuffer in
stolen memory issues that still haunt bugzilla, we should probably
drop this hack again and see what happens.

This was introduced in

commit 0f4706d274
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Tue Mar 18 14:50:50 2014 +0200

    drm/i915: Disable stolen memory when DMAR is active

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
References: https://bugs.freedesktop.org/show_bug.cgi?id=68535
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2014-03-31 10:45:34 +02:00

465 lines
12 KiB
C

/*
* Copyright © 2008-2012 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Eric Anholt <eric@anholt.net>
* Chris Wilson <chris@chris-wilson.co.uk>
*
*/
#include <drm/drmP.h>
#include <drm/i915_drm.h>
#include "i915_drv.h"
/*
* The BIOS typically reserves some of the system's memory for the exclusive
* use of the integrated graphics. This memory is no longer available for
* use by the OS and so the user finds that his system has less memory
* available than he put in. We refer to this memory as stolen.
*
* The BIOS will allocate its framebuffer from the stolen memory. Our
* goal is try to reuse that object for our own fbcon which must always
* be available for panics. Anything else we can reuse the stolen memory
* for is a boon.
*/
static unsigned long i915_stolen_to_physical(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct resource *r;
u32 base;
/* Almost universally we can find the Graphics Base of Stolen Memory
* at offset 0x5c in the igfx configuration space. On a few (desktop)
* machines this is also mirrored in the bridge device at different
* locations, or in the MCHBAR. On gen2, the layout is again slightly
* different with the Graphics Segment immediately following Top of
* Memory (or Top of Usable DRAM). Note it appears that TOUD is only
* reported by 865g, so we just use the top of memory as determined
* by the e820 probe.
*
* XXX However gen2 requires an unavailable symbol.
*/
base = 0;
if (INTEL_INFO(dev)->gen >= 3) {
/* Read Graphics Base of Stolen Memory directly */
pci_read_config_dword(dev->pdev, 0x5c, &base);
base &= ~((1<<20) - 1);
} else { /* GEN2 */
#if 0
/* Stolen is immediately above Top of Memory */
base = max_low_pfn_mapped << PAGE_SHIFT;
#endif
}
if (base == 0)
return 0;
/* Verify that nothing else uses this physical address. Stolen
* memory should be reserved by the BIOS and hidden from the
* kernel. So if the region is already marked as busy, something
* is seriously wrong.
*/
r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size,
"Graphics Stolen Memory");
if (r == NULL) {
/*
* One more attempt but this time requesting region from
* base + 1, as we have seen that this resolves the region
* conflict with the PCI Bus.
* This is a BIOS w/a: Some BIOS wrap stolen in the root
* PCI bus, but have an off-by-one error. Hence retry the
* reservation starting from 1 instead of 0.
*/
r = devm_request_mem_region(dev->dev, base + 1,
dev_priv->gtt.stolen_size - 1,
"Graphics Stolen Memory");
if (r == NULL) {
DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
base, base + (uint32_t)dev_priv->gtt.stolen_size);
base = 0;
}
}
return base;
}
static int i915_setup_compression(struct drm_device *dev, int size)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb);
int ret;
compressed_fb = kzalloc(sizeof(*compressed_fb), GFP_KERNEL);
if (!compressed_fb)
goto err_llb;
/* Try to over-allocate to reduce reallocations and fragmentation */
ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_fb,
size <<= 1, 4096, DRM_MM_SEARCH_DEFAULT);
if (ret)
ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_fb,
size >>= 1, 4096,
DRM_MM_SEARCH_DEFAULT);
if (ret)
goto err_llb;
if (HAS_PCH_SPLIT(dev))
I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start);
else if (IS_GM45(dev)) {
I915_WRITE(DPFC_CB_BASE, compressed_fb->start);
} else {
compressed_llb = kzalloc(sizeof(*compressed_llb), GFP_KERNEL);
if (!compressed_llb)
goto err_fb;
ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_llb,
4096, 4096, DRM_MM_SEARCH_DEFAULT);
if (ret)
goto err_fb;
dev_priv->fbc.compressed_llb = compressed_llb;
I915_WRITE(FBC_CFB_BASE,
dev_priv->mm.stolen_base + compressed_fb->start);
I915_WRITE(FBC_LL_BASE,
dev_priv->mm.stolen_base + compressed_llb->start);
}
dev_priv->fbc.compressed_fb = compressed_fb;
dev_priv->fbc.size = size;
DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n",
size);
return 0;
err_fb:
kfree(compressed_llb);
drm_mm_remove_node(compressed_fb);
err_llb:
kfree(compressed_fb);
pr_info_once("drm: not enough stolen space for compressed buffer (need %d more bytes), disabling. Hint: you may be able to increase stolen memory size in the BIOS to avoid this.\n", size);
return -ENOSPC;
}
int i915_gem_stolen_setup_compression(struct drm_device *dev, int size)
{
struct drm_i915_private *dev_priv = dev->dev_private;
if (!drm_mm_initialized(&dev_priv->mm.stolen))
return -ENODEV;
if (size < dev_priv->fbc.size)
return 0;
/* Release any current block */
i915_gem_stolen_cleanup_compression(dev);
return i915_setup_compression(dev, size);
}
void i915_gem_stolen_cleanup_compression(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
if (dev_priv->fbc.size == 0)
return;
if (dev_priv->fbc.compressed_fb) {
drm_mm_remove_node(dev_priv->fbc.compressed_fb);
kfree(dev_priv->fbc.compressed_fb);
}
if (dev_priv->fbc.compressed_llb) {
drm_mm_remove_node(dev_priv->fbc.compressed_llb);
kfree(dev_priv->fbc.compressed_llb);
}
dev_priv->fbc.size = 0;
}
void i915_gem_cleanup_stolen(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
if (!drm_mm_initialized(&dev_priv->mm.stolen))
return;
i915_gem_stolen_cleanup_compression(dev);
drm_mm_takedown(&dev_priv->mm.stolen);
}
int i915_gem_init_stolen(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int bios_reserved = 0;
#ifdef CONFIG_INTEL_IOMMU
if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
DRM_INFO("DMAR active, disabling use of stolen memory\n");
return 0;
}
#endif
if (dev_priv->gtt.stolen_size == 0)
return 0;
dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
if (dev_priv->mm.stolen_base == 0)
return 0;
DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
if (IS_VALLEYVIEW(dev))
bios_reserved = 1024*1024; /* top 1M on VLV/BYT */
if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size))
return 0;
/* Basic memrange allocator for stolen space */
drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size -
bios_reserved);
return 0;
}
static struct sg_table *
i915_pages_create_for_stolen(struct drm_device *dev,
u32 offset, u32 size)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct sg_table *st;
struct scatterlist *sg;
DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
BUG_ON(offset > dev_priv->gtt.stolen_size - size);
/* We hide that we have no struct page backing our stolen object
* by wrapping the contiguous physical allocation with a fake
* dma mapping in a single scatterlist.
*/
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (st == NULL)
return NULL;
if (sg_alloc_table(st, 1, GFP_KERNEL)) {
kfree(st);
return NULL;
}
sg = st->sgl;
sg->offset = 0;
sg->length = size;
sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
sg_dma_len(sg) = size;
return st;
}
static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
{
BUG();
return -EINVAL;
}
static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
{
/* Should only be called during free */
sg_free_table(obj->pages);
kfree(obj->pages);
}
static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
.get_pages = i915_gem_object_get_pages_stolen,
.put_pages = i915_gem_object_put_pages_stolen,
};
static struct drm_i915_gem_object *
_i915_gem_object_create_stolen(struct drm_device *dev,
struct drm_mm_node *stolen)
{
struct drm_i915_gem_object *obj;
obj = i915_gem_object_alloc(dev);
if (obj == NULL)
return NULL;
drm_gem_private_object_init(dev, &obj->base, stolen->size);
i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
obj->pages = i915_pages_create_for_stolen(dev,
stolen->start, stolen->size);
if (obj->pages == NULL)
goto cleanup;
obj->has_dma_mapping = true;
i915_gem_object_pin_pages(obj);
obj->stolen = stolen;
obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
return obj;
cleanup:
i915_gem_object_free(obj);
return NULL;
}
struct drm_i915_gem_object *
i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_gem_object *obj;
struct drm_mm_node *stolen;
int ret;
if (!drm_mm_initialized(&dev_priv->mm.stolen))
return NULL;
DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
if (size == 0)
return NULL;
stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
if (!stolen)
return NULL;
ret = drm_mm_insert_node(&dev_priv->mm.stolen, stolen, size,
4096, DRM_MM_SEARCH_DEFAULT);
if (ret) {
kfree(stolen);
return NULL;
}
obj = _i915_gem_object_create_stolen(dev, stolen);
if (obj)
return obj;
drm_mm_remove_node(stolen);
kfree(stolen);
return NULL;
}
struct drm_i915_gem_object *
i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
u32 stolen_offset,
u32 gtt_offset,
u32 size)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct i915_address_space *ggtt = &dev_priv->gtt.base;
struct drm_i915_gem_object *obj;
struct drm_mm_node *stolen;
struct i915_vma *vma;
int ret;
if (!drm_mm_initialized(&dev_priv->mm.stolen))
return NULL;
DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
stolen_offset, gtt_offset, size);
/* KISS and expect everything to be page-aligned */
BUG_ON(stolen_offset & 4095);
BUG_ON(size & 4095);
if (WARN_ON(size == 0))
return NULL;
stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
if (!stolen)
return NULL;
stolen->start = stolen_offset;
stolen->size = size;
ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
if (ret) {
DRM_DEBUG_KMS("failed to allocate stolen space\n");
kfree(stolen);
return NULL;
}
obj = _i915_gem_object_create_stolen(dev, stolen);
if (obj == NULL) {
DRM_DEBUG_KMS("failed to allocate stolen object\n");
drm_mm_remove_node(stolen);
kfree(stolen);
return NULL;
}
/* Some objects just need physical mem from stolen space */
if (gtt_offset == I915_GTT_OFFSET_NONE)
return obj;
vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
goto err_out;
}
/* To simplify the initialisation sequence between KMS and GTT,
* we allow construction of the stolen object prior to
* setting up the GTT space. The actual reservation will occur
* later.
*/
vma->node.start = gtt_offset;
vma->node.size = size;
if (drm_mm_initialized(&ggtt->mm)) {
ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);
if (ret) {
DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
goto err_vma;
}
}
obj->has_global_gtt_mapping = 1;
list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
list_add_tail(&vma->mm_list, &ggtt->inactive_list);
i915_gem_object_pin_pages(obj);
return obj;
err_vma:
i915_gem_vma_destroy(vma);
err_out:
drm_mm_remove_node(stolen);
kfree(stolen);
drm_gem_object_unreference(&obj->base);
return NULL;
}
void
i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
{
if (obj->stolen) {
drm_mm_remove_node(obj->stolen);
kfree(obj->stolen);
obj->stolen = NULL;
}
}