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c97689d886
linux/drivers/char/agp/intel-gtt.c
Chris Wilson c97689d886 agp/intel: Flush the chipset write buffers when changing GTT base 
Flush the chipset write buffers before and after adjusting the GTT base
register, just in case. We only modify this value upon initialisation
(boot and resume) so there should be no outstanding writes, however
there are always those persistent PGTBL_ER that keep getting reported
upon resume.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
2011-01-11 20:35:41 +00:00

1525 lines
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/*
* Intel GTT (Graphics Translation Table) routines
*
* Caveat: This driver implements the linux agp interface, but this is far from
* a agp driver! GTT support ended up here for purely historical reasons: The
* old userspace intel graphics drivers needed an interface to map memory into
* the GTT. And the drm provides a default interface for graphic devices sitting
* on an agp port. So it made sense to fake the GTT support as an agp port to
* avoid having to create a new api.
*
* With gem this does not make much sense anymore, just needlessly complicates
* the code. But as long as the old graphics stack is still support, it's stuck
* here.
*
* /fairy-tale-mode off
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/pagemap.h>
#include <linux/agp_backend.h>
#include <asm/smp.h>
#include "agp.h"
#include "intel-agp.h"
#include <drm/intel-gtt.h>
/*
* If we have Intel graphics, we're not going to have anything other than
* an Intel IOMMU. So make the correct use of the PCI DMA API contingent
* on the Intel IOMMU support (CONFIG_DMAR).
* Only newer chipsets need to bother with this, of course.
*/
#ifdef CONFIG_DMAR
#define USE_PCI_DMA_API 1
#else
#define USE_PCI_DMA_API 0
#endif
struct intel_gtt_driver {
unsigned int gen : 8;
unsigned int is_g33 : 1;
unsigned int is_pineview : 1;
unsigned int is_ironlake : 1;
unsigned int has_pgtbl_enable : 1;
unsigned int dma_mask_size : 8;
/* Chipset specific GTT setup */
int (*setup)(void);
/* This should undo anything done in ->setup() save the unmapping
* of the mmio register file, that's done in the generic code. */
void (*cleanup)(void);
void (*write_entry)(dma_addr_t addr, unsigned int entry, unsigned int flags);
/* Flags is a more or less chipset specific opaque value.
* For chipsets that need to support old ums (non-gem) code, this
* needs to be identical to the various supported agp memory types! */
bool (*check_flags)(unsigned int flags);
void (*chipset_flush)(void);
};
static struct _intel_private {
struct intel_gtt base;
const struct intel_gtt_driver *driver;
struct pci_dev *pcidev; /* device one */
struct pci_dev *bridge_dev;
u8 __iomem *registers;
phys_addr_t gtt_bus_addr;
phys_addr_t gma_bus_addr;
u32 PGETBL_save;
u32 __iomem *gtt; /* I915G */
int num_dcache_entries;
union {
void __iomem *i9xx_flush_page;
void *i8xx_flush_page;
};
char *i81x_gtt_table;
struct page *i8xx_page;
struct resource ifp_resource;
int resource_valid;
struct page *scratch_page;
dma_addr_t scratch_page_dma;
} intel_private;
#define INTEL_GTT_GEN intel_private.driver->gen
#define IS_G33 intel_private.driver->is_g33
#define IS_PINEVIEW intel_private.driver->is_pineview
#define IS_IRONLAKE intel_private.driver->is_ironlake
#define HAS_PGTBL_EN intel_private.driver->has_pgtbl_enable
int intel_gtt_map_memory(struct page **pages, unsigned int num_entries,
struct scatterlist **sg_list, int *num_sg)
{
struct sg_table st;
struct scatterlist *sg;
int i;
if (*sg_list)
return 0; /* already mapped (for e.g. resume */
DBG("try mapping %lu pages\n", (unsigned long)num_entries);
if (sg_alloc_table(&st, num_entries, GFP_KERNEL))
goto err;
*sg_list = sg = st.sgl;
for (i = 0 ; i < num_entries; i++, sg = sg_next(sg))
sg_set_page(sg, pages[i], PAGE_SIZE, 0);
*num_sg = pci_map_sg(intel_private.pcidev, *sg_list,
num_entries, PCI_DMA_BIDIRECTIONAL);
if (unlikely(!*num_sg))
goto err;
return 0;
err:
sg_free_table(&st);
return -ENOMEM;
}
EXPORT_SYMBOL(intel_gtt_map_memory);
void intel_gtt_unmap_memory(struct scatterlist *sg_list, int num_sg)
{
struct sg_table st;
DBG("try unmapping %lu pages\n", (unsigned long)mem->page_count);
pci_unmap_sg(intel_private.pcidev, sg_list,
num_sg, PCI_DMA_BIDIRECTIONAL);
st.sgl = sg_list;
st.orig_nents = st.nents = num_sg;
sg_free_table(&st);
}
EXPORT_SYMBOL(intel_gtt_unmap_memory);
static void intel_fake_agp_enable(struct agp_bridge_data *bridge, u32 mode)
{
return;
}
/* Exists to support ARGB cursors */
static struct page *i8xx_alloc_pages(void)
{
struct page *page;
page = alloc_pages(GFP_KERNEL | GFP_DMA32, 2);
if (page == NULL)
return NULL;
if (set_pages_uc(page, 4) < 0) {
set_pages_wb(page, 4);
__free_pages(page, 2);
return NULL;
}
get_page(page);
atomic_inc(&agp_bridge->current_memory_agp);
return page;
}
static void i8xx_destroy_pages(struct page *page)
{
if (page == NULL)
return;
set_pages_wb(page, 4);
put_page(page);
__free_pages(page, 2);
atomic_dec(&agp_bridge->current_memory_agp);
}
#define I810_GTT_ORDER 4
static int i810_setup(void)
{
u32 reg_addr;
char *gtt_table;
/* i81x does not preallocate the gtt. It's always 64kb in size. */
gtt_table = alloc_gatt_pages(I810_GTT_ORDER);
if (gtt_table == NULL)
return -ENOMEM;
intel_private.i81x_gtt_table = gtt_table;
pci_read_config_dword(intel_private.pcidev, I810_MMADDR, &reg_addr);
reg_addr &= 0xfff80000;
intel_private.registers = ioremap(reg_addr, KB(64));
if (!intel_private.registers)
return -ENOMEM;
writel(virt_to_phys(gtt_table) | I810_PGETBL_ENABLED,
intel_private.registers+I810_PGETBL_CTL);
intel_private.gtt_bus_addr = reg_addr + I810_PTE_BASE;
if ((readl(intel_private.registers+I810_DRAM_CTL)
& I810_DRAM_ROW_0) == I810_DRAM_ROW_0_SDRAM) {
dev_info(&intel_private.pcidev->dev,
"detected 4MB dedicated video ram\n");
intel_private.num_dcache_entries = 1024;
}
return 0;
}
static void i810_cleanup(void)
{
writel(0, intel_private.registers+I810_PGETBL_CTL);
free_gatt_pages(intel_private.i81x_gtt_table, I810_GTT_ORDER);
}
static int i810_insert_dcache_entries(struct agp_memory *mem, off_t pg_start,
int type)
{
int i;
if ((pg_start + mem->page_count)
> intel_private.num_dcache_entries)
return -EINVAL;
if (!mem->is_flushed)
global_cache_flush();
for (i = pg_start; i < (pg_start + mem->page_count); i++) {
dma_addr_t addr = i << PAGE_SHIFT;
intel_private.driver->write_entry(addr,
i, type);
}
readl(intel_private.gtt+i-1);
return 0;
}
/*
* The i810/i830 requires a physical address to program its mouse
* pointer into hardware.
* However the Xserver still writes to it through the agp aperture.
*/
static struct agp_memory *alloc_agpphysmem_i8xx(size_t pg_count, int type)
{
struct agp_memory *new;
struct page *page;
switch (pg_count) {
case 1: page = agp_bridge->driver->agp_alloc_page(agp_bridge);
break;
case 4:
/* kludge to get 4 physical pages for ARGB cursor */
page = i8xx_alloc_pages();
break;
default:
return NULL;
}
if (page == NULL)
return NULL;
new = agp_create_memory(pg_count);
if (new == NULL)
return NULL;
new->pages[0] = page;
if (pg_count == 4) {
/* kludge to get 4 physical pages for ARGB cursor */
new->pages[1] = new->pages[0] + 1;
new->pages[2] = new->pages[1] + 1;
new->pages[3] = new->pages[2] + 1;
}
new->page_count = pg_count;
new->num_scratch_pages = pg_count;
new->type = AGP_PHYS_MEMORY;
new->physical = page_to_phys(new->pages[0]);
return new;
}
static void intel_i810_free_by_type(struct agp_memory *curr)
{
agp_free_key(curr->key);
if (curr->type == AGP_PHYS_MEMORY) {
if (curr->page_count == 4)
i8xx_destroy_pages(curr->pages[0]);
else {
agp_bridge->driver->agp_destroy_page(curr->pages[0],
AGP_PAGE_DESTROY_UNMAP);
agp_bridge->driver->agp_destroy_page(curr->pages[0],
AGP_PAGE_DESTROY_FREE);
}
agp_free_page_array(curr);
}
kfree(curr);
}
static int intel_gtt_setup_scratch_page(void)
{
struct page *page;
dma_addr_t dma_addr;
page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
if (page == NULL)
return -ENOMEM;
get_page(page);
set_pages_uc(page, 1);
if (intel_private.base.needs_dmar) {
dma_addr = pci_map_page(intel_private.pcidev, page, 0,
PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
if (pci_dma_mapping_error(intel_private.pcidev, dma_addr))
return -EINVAL;
intel_private.scratch_page_dma = dma_addr;
} else
intel_private.scratch_page_dma = page_to_phys(page);
intel_private.scratch_page = page;
return 0;
}
static void i810_write_entry(dma_addr_t addr, unsigned int entry,
unsigned int flags)
{
u32 pte_flags = I810_PTE_VALID;
switch (flags) {
case AGP_DCACHE_MEMORY:
pte_flags |= I810_PTE_LOCAL;
break;
case AGP_USER_CACHED_MEMORY:
pte_flags |= I830_PTE_SYSTEM_CACHED;
break;
}
writel(addr | pte_flags, intel_private.gtt + entry);
}
static const struct aper_size_info_fixed intel_fake_agp_sizes[] = {
{32, 8192, 3},
{64, 16384, 4},
{128, 32768, 5},
{256, 65536, 6},
{512, 131072, 7},
};
static unsigned int intel_gtt_stolen_size(void)
{
u16 gmch_ctrl;
u8 rdct;
int local = 0;
static const int ddt[4] = { 0, 16, 32, 64 };
unsigned int stolen_size = 0;
if (INTEL_GTT_GEN == 1)
return 0; /* no stolen mem on i81x */
pci_read_config_word(intel_private.bridge_dev,
I830_GMCH_CTRL, &gmch_ctrl);
if (intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82830_HB ||
intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82845G_HB) {
switch (gmch_ctrl & I830_GMCH_GMS_MASK) {
case I830_GMCH_GMS_STOLEN_512:
stolen_size = KB(512);
break;
case I830_GMCH_GMS_STOLEN_1024:
stolen_size = MB(1);
break;
case I830_GMCH_GMS_STOLEN_8192:
stolen_size = MB(8);
break;
case I830_GMCH_GMS_LOCAL:
rdct = readb(intel_private.registers+I830_RDRAM_CHANNEL_TYPE);
stolen_size = (I830_RDRAM_ND(rdct) + 1) *
MB(ddt[I830_RDRAM_DDT(rdct)]);
local = 1;
break;
default:
stolen_size = 0;
break;
}
} else if (INTEL_GTT_GEN == 6) {
/*
* SandyBridge has new memory control reg at 0x50.w
*/
u16 snb_gmch_ctl;
pci_read_config_word(intel_private.pcidev, SNB_GMCH_CTRL, &snb_gmch_ctl);
switch (snb_gmch_ctl & SNB_GMCH_GMS_STOLEN_MASK) {
case SNB_GMCH_GMS_STOLEN_32M:
stolen_size = MB(32);
break;
case SNB_GMCH_GMS_STOLEN_64M:
stolen_size = MB(64);
break;
case SNB_GMCH_GMS_STOLEN_96M:
stolen_size = MB(96);
break;
case SNB_GMCH_GMS_STOLEN_128M:
stolen_size = MB(128);
break;
case SNB_GMCH_GMS_STOLEN_160M:
stolen_size = MB(160);
break;
case SNB_GMCH_GMS_STOLEN_192M:
stolen_size = MB(192);
break;
case SNB_GMCH_GMS_STOLEN_224M:
stolen_size = MB(224);
break;
case SNB_GMCH_GMS_STOLEN_256M:
stolen_size = MB(256);
break;
case SNB_GMCH_GMS_STOLEN_288M:
stolen_size = MB(288);
break;
case SNB_GMCH_GMS_STOLEN_320M:
stolen_size = MB(320);
break;
case SNB_GMCH_GMS_STOLEN_352M:
stolen_size = MB(352);
break;
case SNB_GMCH_GMS_STOLEN_384M:
stolen_size = MB(384);
break;
case SNB_GMCH_GMS_STOLEN_416M:
stolen_size = MB(416);
break;
case SNB_GMCH_GMS_STOLEN_448M:
stolen_size = MB(448);
break;
case SNB_GMCH_GMS_STOLEN_480M:
stolen_size = MB(480);
break;
case SNB_GMCH_GMS_STOLEN_512M:
stolen_size = MB(512);
break;
}
} else {
switch (gmch_ctrl & I855_GMCH_GMS_MASK) {
case I855_GMCH_GMS_STOLEN_1M:
stolen_size = MB(1);
break;
case I855_GMCH_GMS_STOLEN_4M:
stolen_size = MB(4);
break;
case I855_GMCH_GMS_STOLEN_8M:
stolen_size = MB(8);
break;
case I855_GMCH_GMS_STOLEN_16M:
stolen_size = MB(16);
break;
case I855_GMCH_GMS_STOLEN_32M:
stolen_size = MB(32);
break;
case I915_GMCH_GMS_STOLEN_48M:
stolen_size = MB(48);
break;
case I915_GMCH_GMS_STOLEN_64M:
stolen_size = MB(64);
break;
case G33_GMCH_GMS_STOLEN_128M:
stolen_size = MB(128);
break;
case G33_GMCH_GMS_STOLEN_256M:
stolen_size = MB(256);
break;
case INTEL_GMCH_GMS_STOLEN_96M:
stolen_size = MB(96);
break;
case INTEL_GMCH_GMS_STOLEN_160M:
stolen_size = MB(160);
break;
case INTEL_GMCH_GMS_STOLEN_224M:
stolen_size = MB(224);
break;
case INTEL_GMCH_GMS_STOLEN_352M:
stolen_size = MB(352);
break;
default:
stolen_size = 0;
break;
}
}
if (stolen_size > 0) {
dev_info(&intel_private.bridge_dev->dev, "detected %dK %s memory\n",
stolen_size / KB(1), local ? "local" : "stolen");
} else {
dev_info(&intel_private.bridge_dev->dev,
"no pre-allocated video memory detected\n");
stolen_size = 0;
}
return stolen_size;
}
static void i965_adjust_pgetbl_size(unsigned int size_flag)
{
u32 pgetbl_ctl, pgetbl_ctl2;
/* ensure that ppgtt is disabled */
pgetbl_ctl2 = readl(intel_private.registers+I965_PGETBL_CTL2);
pgetbl_ctl2 &= ~I810_PGETBL_ENABLED;
writel(pgetbl_ctl2, intel_private.registers+I965_PGETBL_CTL2);
/* write the new ggtt size */
pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
pgetbl_ctl &= ~I965_PGETBL_SIZE_MASK;
pgetbl_ctl |= size_flag;
writel(pgetbl_ctl, intel_private.registers+I810_PGETBL_CTL);
}
static unsigned int i965_gtt_total_entries(void)
{
int size;
u32 pgetbl_ctl;
u16 gmch_ctl;
pci_read_config_word(intel_private.bridge_dev,
I830_GMCH_CTRL, &gmch_ctl);
if (INTEL_GTT_GEN == 5) {
switch (gmch_ctl & G4x_GMCH_SIZE_MASK) {
case G4x_GMCH_SIZE_1M:
case G4x_GMCH_SIZE_VT_1M:
i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1MB);
break;
case G4x_GMCH_SIZE_VT_1_5M:
i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1_5MB);
break;
case G4x_GMCH_SIZE_2M:
case G4x_GMCH_SIZE_VT_2M:
i965_adjust_pgetbl_size(I965_PGETBL_SIZE_2MB);
break;
}
}
pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
switch (pgetbl_ctl & I965_PGETBL_SIZE_MASK) {
case I965_PGETBL_SIZE_128KB:
size = KB(128);
break;
case I965_PGETBL_SIZE_256KB:
size = KB(256);
break;
case I965_PGETBL_SIZE_512KB:
size = KB(512);
break;
/* GTT pagetable sizes bigger than 512KB are not possible on G33! */
case I965_PGETBL_SIZE_1MB:
size = KB(1024);
break;
case I965_PGETBL_SIZE_2MB:
size = KB(2048);
break;
case I965_PGETBL_SIZE_1_5MB:
size = KB(1024 + 512);
break;
default:
dev_info(&intel_private.pcidev->dev,
"unknown page table size, assuming 512KB\n");
size = KB(512);
}
return size/4;
}
static unsigned int intel_gtt_total_entries(void)
{
int size;
if (IS_G33 || INTEL_GTT_GEN == 4 || INTEL_GTT_GEN == 5)
return i965_gtt_total_entries();
else if (INTEL_GTT_GEN == 6) {
u16 snb_gmch_ctl;
pci_read_config_word(intel_private.pcidev, SNB_GMCH_CTRL, &snb_gmch_ctl);
switch (snb_gmch_ctl & SNB_GTT_SIZE_MASK) {
default:
case SNB_GTT_SIZE_0M:
printk(KERN_ERR "Bad GTT size mask: 0x%04x.\n", snb_gmch_ctl);
size = MB(0);
break;
case SNB_GTT_SIZE_1M:
size = MB(1);
break;
case SNB_GTT_SIZE_2M:
size = MB(2);
break;
}
return size/4;
} else {
/* On previous hardware, the GTT size was just what was
* required to map the aperture.
*/
return intel_private.base.gtt_mappable_entries;
}
}
static unsigned int intel_gtt_mappable_entries(void)
{
unsigned int aperture_size;
if (INTEL_GTT_GEN == 1) {
u32 smram_miscc;
pci_read_config_dword(intel_private.bridge_dev,
I810_SMRAM_MISCC, &smram_miscc);
if ((smram_miscc & I810_GFX_MEM_WIN_SIZE)
== I810_GFX_MEM_WIN_32M)
aperture_size = MB(32);
else
aperture_size = MB(64);
} else if (INTEL_GTT_GEN == 2) {
u16 gmch_ctrl;
pci_read_config_word(intel_private.bridge_dev,
I830_GMCH_CTRL, &gmch_ctrl);
if ((gmch_ctrl & I830_GMCH_MEM_MASK) == I830_GMCH_MEM_64M)
aperture_size = MB(64);
else
aperture_size = MB(128);
} else {
/* 9xx supports large sizes, just look at the length */
aperture_size = pci_resource_len(intel_private.pcidev, 2);
}
return aperture_size >> PAGE_SHIFT;
}
static void intel_gtt_teardown_scratch_page(void)
{
set_pages_wb(intel_private.scratch_page, 1);
pci_unmap_page(intel_private.pcidev, intel_private.scratch_page_dma,
PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
put_page(intel_private.scratch_page);
__free_page(intel_private.scratch_page);
}
static void intel_gtt_cleanup(void)
{
intel_private.driver->cleanup();
iounmap(intel_private.gtt);
iounmap(intel_private.registers);
intel_gtt_teardown_scratch_page();
}
static int intel_gtt_init(void)
{
u32 gtt_map_size;
int ret;
ret = intel_private.driver->setup();
if (ret != 0)
return ret;
intel_private.base.gtt_mappable_entries = intel_gtt_mappable_entries();
intel_private.base.gtt_total_entries = intel_gtt_total_entries();
/* save the PGETBL reg for resume */
intel_private.PGETBL_save =
readl(intel_private.registers+I810_PGETBL_CTL)
& ~I810_PGETBL_ENABLED;
/* we only ever restore the register when enabling the PGTBL... */
if (HAS_PGTBL_EN)
intel_private.PGETBL_save |= I810_PGETBL_ENABLED;
dev_info(&intel_private.bridge_dev->dev,
"detected gtt size: %dK total, %dK mappable\n",
intel_private.base.gtt_total_entries * 4,
intel_private.base.gtt_mappable_entries * 4);
gtt_map_size = intel_private.base.gtt_total_entries * 4;
intel_private.gtt = ioremap(intel_private.gtt_bus_addr,
gtt_map_size);
if (!intel_private.gtt) {
intel_private.driver->cleanup();
iounmap(intel_private.registers);
return -ENOMEM;
}
global_cache_flush(); /* FIXME: ? */
intel_private.base.stolen_size = intel_gtt_stolen_size();
ret = intel_gtt_setup_scratch_page();
if (ret != 0) {
intel_gtt_cleanup();
return ret;
}
intel_private.base.needs_dmar = USE_PCI_DMA_API && INTEL_GTT_GEN > 2;
return 0;
}
static int intel_fake_agp_fetch_size(void)
{
int num_sizes = ARRAY_SIZE(intel_fake_agp_sizes);
unsigned int aper_size;
int i;
aper_size = (intel_private.base.gtt_mappable_entries << PAGE_SHIFT)
/ MB(1);
for (i = 0; i < num_sizes; i++) {
if (aper_size == intel_fake_agp_sizes[i].size) {
agp_bridge->current_size =
(void *) (intel_fake_agp_sizes + i);
return aper_size;
}
}
return 0;
}
static void i830_cleanup(void)
{
if (intel_private.i8xx_flush_page) {
kunmap(intel_private.i8xx_flush_page);
intel_private.i8xx_flush_page = NULL;
}
__free_page(intel_private.i8xx_page);
intel_private.i8xx_page = NULL;
}
static void intel_i830_setup_flush(void)
{
/* return if we've already set the flush mechanism up */
if (intel_private.i8xx_page)
return;
intel_private.i8xx_page = alloc_page(GFP_KERNEL);
if (!intel_private.i8xx_page)
return;
intel_private.i8xx_flush_page = kmap(intel_private.i8xx_page);
if (!intel_private.i8xx_flush_page)
i830_cleanup();
}
/* The chipset_flush interface needs to get data that has already been
* flushed out of the CPU all the way out to main memory, because the GPU
* doesn't snoop those buffers.
*
* The 8xx series doesn't have the same lovely interface for flushing the
* chipset write buffers that the later chips do. According to the 865
* specs, it's 64 octwords, or 1KB. So, to get those previous things in
* that buffer out, we just fill 1KB and clflush it out, on the assumption
* that it'll push whatever was in there out. It appears to work.
*/
static void i830_chipset_flush(void)
{
unsigned int *pg = intel_private.i8xx_flush_page;
memset(pg, 0, 1024);
if (cpu_has_clflush)
clflush_cache_range(pg, 1024);
else if (wbinvd_on_all_cpus() != 0)
printk(KERN_ERR "Timed out waiting for cache flush.\n");
}
static void i830_write_entry(dma_addr_t addr, unsigned int entry,
unsigned int flags)
{
u32 pte_flags = I810_PTE_VALID;
if (flags == AGP_USER_CACHED_MEMORY)
pte_flags |= I830_PTE_SYSTEM_CACHED;
writel(addr | pte_flags, intel_private.gtt + entry);
}
static bool intel_enable_gtt(void)
{
u32 gma_addr;
u8 __iomem *reg;
if (INTEL_GTT_GEN <= 2)
pci_read_config_dword(intel_private.pcidev, I810_GMADDR,
&gma_addr);
else
pci_read_config_dword(intel_private.pcidev, I915_GMADDR,
&gma_addr);
intel_private.gma_bus_addr = (gma_addr & PCI_BASE_ADDRESS_MEM_MASK);
if (INTEL_GTT_GEN >= 6)
return true;
if (INTEL_GTT_GEN == 2) {
u16 gmch_ctrl;
pci_read_config_word(intel_private.bridge_dev,
I830_GMCH_CTRL, &gmch_ctrl);
gmch_ctrl |= I830_GMCH_ENABLED;
pci_write_config_word(intel_private.bridge_dev,
I830_GMCH_CTRL, gmch_ctrl);
pci_read_config_word(intel_private.bridge_dev,
I830_GMCH_CTRL, &gmch_ctrl);
if ((gmch_ctrl & I830_GMCH_ENABLED) == 0) {
dev_err(&intel_private.pcidev->dev,
"failed to enable the GTT: GMCH_CTRL=%x\n",
gmch_ctrl);
return false;
}
}
/* On the resume path we may be adjusting the PGTBL value, so
* be paranoid and flush all chipset write buffers...
*/
if (INTEL_GTT_GEN >= 3)
writel(0, intel_private.registers+GFX_FLSH_CNTL);
reg = intel_private.registers+I810_PGETBL_CTL;
writel(intel_private.PGETBL_save, reg);
if (HAS_PGTBL_EN && (readl(reg) & I810_PGETBL_ENABLED) == 0) {
dev_err(&intel_private.pcidev->dev,
"failed to enable the GTT: PGETBL=%x [expected %x]\n",
readl(reg), intel_private.PGETBL_save);
return false;
}
if (INTEL_GTT_GEN >= 3)
writel(0, intel_private.registers+GFX_FLSH_CNTL);
return true;
}
static int i830_setup(void)
{
u32 reg_addr;
pci_read_config_dword(intel_private.pcidev, I810_MMADDR, &reg_addr);
reg_addr &= 0xfff80000;
intel_private.registers = ioremap(reg_addr, KB(64));
if (!intel_private.registers)
return -ENOMEM;
intel_private.gtt_bus_addr = reg_addr + I810_PTE_BASE;
intel_i830_setup_flush();
return 0;
}
static int intel_fake_agp_create_gatt_table(struct agp_bridge_data *bridge)
{
agp_bridge->gatt_table_real = NULL;
agp_bridge->gatt_table = NULL;
agp_bridge->gatt_bus_addr = 0;
return 0;
}
static int intel_fake_agp_free_gatt_table(struct agp_bridge_data *bridge)
{
return 0;
}
static int intel_fake_agp_configure(void)
{
int i;
if (!intel_enable_gtt())
return -EIO;
agp_bridge->gart_bus_addr = intel_private.gma_bus_addr;
for (i = 0; i < intel_private.base.gtt_total_entries; i++) {
intel_private.driver->write_entry(intel_private.scratch_page_dma,
i, 0);
}
readl(intel_private.gtt+i-1); /* PCI Posting. */
global_cache_flush();
return 0;
}
static bool i830_check_flags(unsigned int flags)
{
switch (flags) {
case 0:
case AGP_PHYS_MEMORY:
case AGP_USER_CACHED_MEMORY:
case AGP_USER_MEMORY:
return true;
}
return false;
}
void intel_gtt_insert_sg_entries(struct scatterlist *sg_list,
unsigned int sg_len,
unsigned int pg_start,
unsigned int flags)
{
struct scatterlist *sg;
unsigned int len, m;
int i, j;
j = pg_start;
/* sg may merge pages, but we have to separate
* per-page addr for GTT */
for_each_sg(sg_list, sg, sg_len, i) {
len = sg_dma_len(sg) >> PAGE_SHIFT;
for (m = 0; m < len; m++) {
dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
intel_private.driver->write_entry(addr,
j, flags);
j++;
}
}
readl(intel_private.gtt+j-1);
}
EXPORT_SYMBOL(intel_gtt_insert_sg_entries);
void intel_gtt_insert_pages(unsigned int first_entry, unsigned int num_entries,
struct page **pages, unsigned int flags)
{
int i, j;
for (i = 0, j = first_entry; i < num_entries; i++, j++) {
dma_addr_t addr = page_to_phys(pages[i]);
intel_private.driver->write_entry(addr,
j, flags);
}
readl(intel_private.gtt+j-1);
}
EXPORT_SYMBOL(intel_gtt_insert_pages);
static int intel_fake_agp_insert_entries(struct agp_memory *mem,
off_t pg_start, int type)
{
int ret = -EINVAL;
if (INTEL_GTT_GEN == 1 && type == AGP_DCACHE_MEMORY)
return i810_insert_dcache_entries(mem, pg_start, type);
if (mem->page_count == 0)
goto out;
if (pg_start + mem->page_count > intel_private.base.gtt_total_entries)
goto out_err;
if (type != mem->type)
goto out_err;
if (!intel_private.driver->check_flags(type))
goto out_err;
if (!mem->is_flushed)
global_cache_flush();
if (intel_private.base.needs_dmar) {
ret = intel_gtt_map_memory(mem->pages, mem->page_count,
&mem->sg_list, &mem->num_sg);
if (ret != 0)
return ret;
intel_gtt_insert_sg_entries(mem->sg_list, mem->num_sg,
pg_start, type);
} else
intel_gtt_insert_pages(pg_start, mem->page_count, mem->pages,
type);
out:
ret = 0;
out_err:
mem->is_flushed = true;
return ret;
}
void intel_gtt_clear_range(unsigned int first_entry, unsigned int num_entries)
{
unsigned int i;
for (i = first_entry; i < (first_entry + num_entries); i++) {
intel_private.driver->write_entry(intel_private.scratch_page_dma,
i, 0);
}
readl(intel_private.gtt+i-1);
}
EXPORT_SYMBOL(intel_gtt_clear_range);
static int intel_fake_agp_remove_entries(struct agp_memory *mem,
off_t pg_start, int type)
{
if (mem->page_count == 0)
return 0;
if (intel_private.base.needs_dmar) {
intel_gtt_unmap_memory(mem->sg_list, mem->num_sg);
mem->sg_list = NULL;
mem->num_sg = 0;
}
intel_gtt_clear_range(pg_start, mem->page_count);
return 0;
}
static struct agp_memory *intel_fake_agp_alloc_by_type(size_t pg_count,
int type)
{
struct agp_memory *new;
if (type == AGP_DCACHE_MEMORY && INTEL_GTT_GEN == 1) {
if (pg_count != intel_private.num_dcache_entries)
return NULL;
new = agp_create_memory(1);
if (new == NULL)
return NULL;
new->type = AGP_DCACHE_MEMORY;
new->page_count = pg_count;
new->num_scratch_pages = 0;
agp_free_page_array(new);
return new;
}
if (type == AGP_PHYS_MEMORY)
return alloc_agpphysmem_i8xx(pg_count, type);
/* always return NULL for other allocation types for now */
return NULL;
}
static int intel_alloc_chipset_flush_resource(void)
{
int ret;
ret = pci_bus_alloc_resource(intel_private.bridge_dev->bus, &intel_private.ifp_resource, PAGE_SIZE,
PAGE_SIZE, PCIBIOS_MIN_MEM, 0,
pcibios_align_resource, intel_private.bridge_dev);
return ret;
}
static void intel_i915_setup_chipset_flush(void)
{
int ret;
u32 temp;
pci_read_config_dword(intel_private.bridge_dev, I915_IFPADDR, &temp);
if (!(temp & 0x1)) {
intel_alloc_chipset_flush_resource();
intel_private.resource_valid = 1;
pci_write_config_dword(intel_private.bridge_dev, I915_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
} else {
temp &= ~1;
intel_private.resource_valid = 1;
intel_private.ifp_resource.start = temp;
intel_private.ifp_resource.end = temp + PAGE_SIZE;
ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
/* some BIOSes reserve this area in a pnp some don't */
if (ret)
intel_private.resource_valid = 0;
}
}
static void intel_i965_g33_setup_chipset_flush(void)
{
u32 temp_hi, temp_lo;
int ret;
pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4, &temp_hi);
pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR, &temp_lo);
if (!(temp_lo & 0x1)) {
intel_alloc_chipset_flush_resource();
intel_private.resource_valid = 1;
pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4,
upper_32_bits(intel_private.ifp_resource.start));
pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
} else {
u64 l64;
temp_lo &= ~0x1;
l64 = ((u64)temp_hi << 32) | temp_lo;
intel_private.resource_valid = 1;
intel_private.ifp_resource.start = l64;
intel_private.ifp_resource.end = l64 + PAGE_SIZE;
ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
/* some BIOSes reserve this area in a pnp some don't */
if (ret)
intel_private.resource_valid = 0;
}
}
static void intel_i9xx_setup_flush(void)
{
/* return if already configured */
if (intel_private.ifp_resource.start)
return;
if (INTEL_GTT_GEN == 6)
return;
/* setup a resource for this object */
intel_private.ifp_resource.name = "Intel Flush Page";
intel_private.ifp_resource.flags = IORESOURCE_MEM;
/* Setup chipset flush for 915 */
if (IS_G33 || INTEL_GTT_GEN >= 4) {
intel_i965_g33_setup_chipset_flush();
} else {
intel_i915_setup_chipset_flush();
}
if (intel_private.ifp_resource.start)
intel_private.i9xx_flush_page = ioremap_nocache(intel_private.ifp_resource.start, PAGE_SIZE);
if (!intel_private.i9xx_flush_page)
dev_err(&intel_private.pcidev->dev,
"can't ioremap flush page - no chipset flushing\n");
}
static void i9xx_cleanup(void)
{
if (intel_private.i9xx_flush_page)
iounmap(intel_private.i9xx_flush_page);
if (intel_private.resource_valid)
release_resource(&intel_private.ifp_resource);
intel_private.ifp_resource.start = 0;
intel_private.resource_valid = 0;
}
static void i9xx_chipset_flush(void)
{
if (intel_private.i9xx_flush_page)
writel(1, intel_private.i9xx_flush_page);
}
static void i965_write_entry(dma_addr_t addr,
unsigned int entry,
unsigned int flags)
{
u32 pte_flags;
pte_flags = I810_PTE_VALID;
if (flags == AGP_USER_CACHED_MEMORY)
pte_flags |= I830_PTE_SYSTEM_CACHED;
/* Shift high bits down */
addr |= (addr >> 28) & 0xf0;
writel(addr | pte_flags, intel_private.gtt + entry);
}
static bool gen6_check_flags(unsigned int flags)
{
return true;
}
static void gen6_write_entry(dma_addr_t addr, unsigned int entry,
unsigned int flags)
{
unsigned int type_mask = flags & ~AGP_USER_CACHED_MEMORY_GFDT;
unsigned int gfdt = flags & AGP_USER_CACHED_MEMORY_GFDT;
u32 pte_flags;
if (type_mask == AGP_USER_MEMORY)
pte_flags = GEN6_PTE_UNCACHED | I810_PTE_VALID;
else if (type_mask == AGP_USER_CACHED_MEMORY_LLC_MLC) {
pte_flags = GEN6_PTE_LLC_MLC | I810_PTE_VALID;
if (gfdt)
pte_flags |= GEN6_PTE_GFDT;
} else { /* set 'normal'/'cached' to LLC by default */
pte_flags = GEN6_PTE_LLC | I810_PTE_VALID;
if (gfdt)
pte_flags |= GEN6_PTE_GFDT;
}
/* gen6 has bit11-4 for physical addr bit39-32 */
addr |= (addr >> 28) & 0xff0;
writel(addr | pte_flags, intel_private.gtt + entry);
}
static void gen6_cleanup(void)
{
}
static int i9xx_setup(void)
{
u32 reg_addr;
pci_read_config_dword(intel_private.pcidev, I915_MMADDR, &reg_addr);
reg_addr &= 0xfff80000;
intel_private.registers = ioremap(reg_addr, 128 * 4096);
if (!intel_private.registers)
return -ENOMEM;
if (INTEL_GTT_GEN == 3) {
u32 gtt_addr;
pci_read_config_dword(intel_private.pcidev,
I915_PTEADDR, &gtt_addr);
intel_private.gtt_bus_addr = gtt_addr;
} else {
u32 gtt_offset;
switch (INTEL_GTT_GEN) {
case 5:
case 6:
gtt_offset = MB(2);
break;
case 4:
default:
gtt_offset = KB(512);
break;
}
intel_private.gtt_bus_addr = reg_addr + gtt_offset;
}
intel_i9xx_setup_flush();
return 0;
}
static const struct agp_bridge_driver intel_fake_agp_driver = {
.owner = THIS_MODULE,
.size_type = FIXED_APER_SIZE,
.aperture_sizes = intel_fake_agp_sizes,
.num_aperture_sizes = ARRAY_SIZE(intel_fake_agp_sizes),
.configure = intel_fake_agp_configure,
.fetch_size = intel_fake_agp_fetch_size,
.cleanup = intel_gtt_cleanup,
.agp_enable = intel_fake_agp_enable,
.cache_flush = global_cache_flush,
.create_gatt_table = intel_fake_agp_create_gatt_table,
.free_gatt_table = intel_fake_agp_free_gatt_table,
.insert_memory = intel_fake_agp_insert_entries,
.remove_memory = intel_fake_agp_remove_entries,
.alloc_by_type = intel_fake_agp_alloc_by_type,
.free_by_type = intel_i810_free_by_type,
.agp_alloc_page = agp_generic_alloc_page,
.agp_alloc_pages = agp_generic_alloc_pages,
.agp_destroy_page = agp_generic_destroy_page,
.agp_destroy_pages = agp_generic_destroy_pages,
};
static const struct intel_gtt_driver i81x_gtt_driver = {
.gen = 1,
.has_pgtbl_enable = 1,
.dma_mask_size = 32,
.setup = i810_setup,
.cleanup = i810_cleanup,
.check_flags = i830_check_flags,
.write_entry = i810_write_entry,
};
static const struct intel_gtt_driver i8xx_gtt_driver = {
.gen = 2,
.has_pgtbl_enable = 1,
.setup = i830_setup,
.cleanup = i830_cleanup,
.write_entry = i830_write_entry,
.dma_mask_size = 32,
.check_flags = i830_check_flags,
.chipset_flush = i830_chipset_flush,
};
static const struct intel_gtt_driver i915_gtt_driver = {
.gen = 3,
.has_pgtbl_enable = 1,
.setup = i9xx_setup,
.cleanup = i9xx_cleanup,
/* i945 is the last gpu to need phys mem (for overlay and cursors). */
.write_entry = i830_write_entry,
.dma_mask_size = 32,
.check_flags = i830_check_flags,
.chipset_flush = i9xx_chipset_flush,
};
static const struct intel_gtt_driver g33_gtt_driver = {
.gen = 3,
.is_g33 = 1,
.setup = i9xx_setup,
.cleanup = i9xx_cleanup,
.write_entry = i965_write_entry,
.dma_mask_size = 36,
.check_flags = i830_check_flags,
.chipset_flush = i9xx_chipset_flush,
};
static const struct intel_gtt_driver pineview_gtt_driver = {
.gen = 3,
.is_pineview = 1, .is_g33 = 1,
.setup = i9xx_setup,
.cleanup = i9xx_cleanup,
.write_entry = i965_write_entry,
.dma_mask_size = 36,
.check_flags = i830_check_flags,
.chipset_flush = i9xx_chipset_flush,
};
static const struct intel_gtt_driver i965_gtt_driver = {
.gen = 4,
.has_pgtbl_enable = 1,
.setup = i9xx_setup,
.cleanup = i9xx_cleanup,
.write_entry = i965_write_entry,
.dma_mask_size = 36,
.check_flags = i830_check_flags,
.chipset_flush = i9xx_chipset_flush,
};
static const struct intel_gtt_driver g4x_gtt_driver = {
.gen = 5,
.setup = i9xx_setup,
.cleanup = i9xx_cleanup,
.write_entry = i965_write_entry,
.dma_mask_size = 36,
.check_flags = i830_check_flags,
.chipset_flush = i9xx_chipset_flush,
};
static const struct intel_gtt_driver ironlake_gtt_driver = {
.gen = 5,
.is_ironlake = 1,
.setup = i9xx_setup,
.cleanup = i9xx_cleanup,
.write_entry = i965_write_entry,
.dma_mask_size = 36,
.check_flags = i830_check_flags,
.chipset_flush = i9xx_chipset_flush,
};
static const struct intel_gtt_driver sandybridge_gtt_driver = {
.gen = 6,
.setup = i9xx_setup,
.cleanup = gen6_cleanup,
.write_entry = gen6_write_entry,
.dma_mask_size = 40,
.check_flags = gen6_check_flags,
.chipset_flush = i9xx_chipset_flush,
};
/* Table to describe Intel GMCH and AGP/PCIE GART drivers. At least one of
* driver and gmch_driver must be non-null, and find_gmch will determine
* which one should be used if a gmch_chip_id is present.
*/
static const struct intel_gtt_driver_description {
unsigned int gmch_chip_id;
char *name;
const struct intel_gtt_driver *gtt_driver;
} intel_gtt_chipsets[] = {
{ PCI_DEVICE_ID_INTEL_82810_IG1, "i810",
&i81x_gtt_driver},
{ PCI_DEVICE_ID_INTEL_82810_IG3, "i810",
&i81x_gtt_driver},
{ PCI_DEVICE_ID_INTEL_82810E_IG, "i810",
&i81x_gtt_driver},
{ PCI_DEVICE_ID_INTEL_82815_CGC, "i815",
&i81x_gtt_driver},
{ PCI_DEVICE_ID_INTEL_82830_CGC, "830M",
&i8xx_gtt_driver},
{ PCI_DEVICE_ID_INTEL_82845G_IG, "830M",
&i8xx_gtt_driver},
{ PCI_DEVICE_ID_INTEL_82854_IG, "854",
&i8xx_gtt_driver},
{ PCI_DEVICE_ID_INTEL_82855GM_IG, "855GM",
&i8xx_gtt_driver},
{ PCI_DEVICE_ID_INTEL_82865_IG, "865",
&i8xx_gtt_driver},
{ PCI_DEVICE_ID_INTEL_E7221_IG, "E7221 (i915)",
&i915_gtt_driver },
{ PCI_DEVICE_ID_INTEL_82915G_IG, "915G",
&i915_gtt_driver },
{ PCI_DEVICE_ID_INTEL_82915GM_IG, "915GM",
&i915_gtt_driver },
{ PCI_DEVICE_ID_INTEL_82945G_IG, "945G",
&i915_gtt_driver },
{ PCI_DEVICE_ID_INTEL_82945GM_IG, "945GM",
&i915_gtt_driver },
{ PCI_DEVICE_ID_INTEL_82945GME_IG, "945GME",
&i915_gtt_driver },
{ PCI_DEVICE_ID_INTEL_82946GZ_IG, "946GZ",
&i965_gtt_driver },
{ PCI_DEVICE_ID_INTEL_82G35_IG, "G35",
&i965_gtt_driver },
{ PCI_DEVICE_ID_INTEL_82965Q_IG, "965Q",
&i965_gtt_driver },
{ PCI_DEVICE_ID_INTEL_82965G_IG, "965G",
&i965_gtt_driver },
{ PCI_DEVICE_ID_INTEL_82965GM_IG, "965GM",
&i965_gtt_driver },
{ PCI_DEVICE_ID_INTEL_82965GME_IG, "965GME/GLE",
&i965_gtt_driver },
{ PCI_DEVICE_ID_INTEL_G33_IG, "G33",
&g33_gtt_driver },
{ PCI_DEVICE_ID_INTEL_Q35_IG, "Q35",
&g33_gtt_driver },
{ PCI_DEVICE_ID_INTEL_Q33_IG, "Q33",
&g33_gtt_driver },
{ PCI_DEVICE_ID_INTEL_PINEVIEW_M_IG, "GMA3150",
&pineview_gtt_driver },
{ PCI_DEVICE_ID_INTEL_PINEVIEW_IG, "GMA3150",
&pineview_gtt_driver },
{ PCI_DEVICE_ID_INTEL_GM45_IG, "GM45",
&g4x_gtt_driver },
{ PCI_DEVICE_ID_INTEL_EAGLELAKE_IG, "Eaglelake",
&g4x_gtt_driver },
{ PCI_DEVICE_ID_INTEL_Q45_IG, "Q45/Q43",
&g4x_gtt_driver },
{ PCI_DEVICE_ID_INTEL_G45_IG, "G45/G43",
&g4x_gtt_driver },
{ PCI_DEVICE_ID_INTEL_B43_IG, "B43",
&g4x_gtt_driver },
{ PCI_DEVICE_ID_INTEL_B43_1_IG, "B43",
&g4x_gtt_driver },
{ PCI_DEVICE_ID_INTEL_G41_IG, "G41",
&g4x_gtt_driver },
{ PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG,
"HD Graphics", &ironlake_gtt_driver },
{ PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG,
"HD Graphics", &ironlake_gtt_driver },
{ PCI_DEVICE_ID_INTEL_SANDYBRIDGE_GT1_IG,
"Sandybridge", &sandybridge_gtt_driver },
{ PCI_DEVICE_ID_INTEL_SANDYBRIDGE_GT2_IG,
"Sandybridge", &sandybridge_gtt_driver },
{ PCI_DEVICE_ID_INTEL_SANDYBRIDGE_GT2_PLUS_IG,
"Sandybridge", &sandybridge_gtt_driver },
{ PCI_DEVICE_ID_INTEL_SANDYBRIDGE_M_GT1_IG,
"Sandybridge", &sandybridge_gtt_driver },
{ PCI_DEVICE_ID_INTEL_SANDYBRIDGE_M_GT2_IG,
"Sandybridge", &sandybridge_gtt_driver },
{ PCI_DEVICE_ID_INTEL_SANDYBRIDGE_M_GT2_PLUS_IG,
"Sandybridge", &sandybridge_gtt_driver },
{ PCI_DEVICE_ID_INTEL_SANDYBRIDGE_S_IG,
"Sandybridge", &sandybridge_gtt_driver },
{ 0, NULL, NULL }
};
static int find_gmch(u16 device)
{
struct pci_dev *gmch_device;
gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL, device, NULL);
if (gmch_device && PCI_FUNC(gmch_device->devfn) != 0) {
gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL,
device, gmch_device);
}
if (!gmch_device)
return 0;
intel_private.pcidev = gmch_device;
return 1;
}
int intel_gmch_probe(struct pci_dev *pdev,
struct agp_bridge_data *bridge)
{
int i, mask;
intel_private.driver = NULL;
for (i = 0; intel_gtt_chipsets[i].name != NULL; i++) {
if (find_gmch(intel_gtt_chipsets[i].gmch_chip_id)) {
intel_private.driver =
intel_gtt_chipsets[i].gtt_driver;
break;
}
}
if (!intel_private.driver)
return 0;
bridge->driver = &intel_fake_agp_driver;
bridge->dev_private_data = &intel_private;
bridge->dev = pdev;
intel_private.bridge_dev = pci_dev_get(pdev);
dev_info(&pdev->dev, "Intel %s Chipset\n", intel_gtt_chipsets[i].name);
mask = intel_private.driver->dma_mask_size;
if (pci_set_dma_mask(intel_private.pcidev, DMA_BIT_MASK(mask)))
dev_err(&intel_private.pcidev->dev,
"set gfx device dma mask %d-bit failed!\n", mask);
else
pci_set_consistent_dma_mask(intel_private.pcidev,
DMA_BIT_MASK(mask));
/*if (bridge->driver == &intel_810_driver)
return 1;*/
if (intel_gtt_init() != 0)
return 0;
return 1;
}
EXPORT_SYMBOL(intel_gmch_probe);
const struct intel_gtt *intel_gtt_get(void)
{
return &intel_private.base;
}
EXPORT_SYMBOL(intel_gtt_get);
void intel_gtt_chipset_flush(void)
{
if (intel_private.driver->chipset_flush)
intel_private.driver->chipset_flush();
}
EXPORT_SYMBOL(intel_gtt_chipset_flush);
void intel_gmch_remove(struct pci_dev *pdev)
{
if (intel_private.pcidev)
pci_dev_put(intel_private.pcidev);
if (intel_private.bridge_dev)
pci_dev_put(intel_private.bridge_dev);
}
EXPORT_SYMBOL(intel_gmch_remove);
MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
MODULE_LICENSE("GPL and additional rights");
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