--- /dev/null
+/*
+ * 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/kernel.h>
+#include <linux/pagemap.h>
+#include <linux/agp_backend.h>
+#include <linux/delay.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_INTEL_IOMMU).
+ * Only newer chipsets need to bother with this, of course.
+ */
+#ifdef CONFIG_INTEL_IOMMU
+#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 {
+ const struct intel_gtt_driver *driver;
+ struct pci_dev *pcidev; /* device one */
+ struct pci_dev *bridge_dev;
+ u8 __iomem *registers;
+ phys_addr_t gtt_phys_addr;
+ u32 PGETBL_save;
+ u32 __iomem *gtt; /* I915G */
+ bool clear_fake_agp; /* on first access via agp, fill with scratch */
+ int num_dcache_entries;
+ void __iomem *i9xx_flush_page;
+ char *i81x_gtt_table;
+ struct resource ifp_resource;
+ int resource_valid;
+ struct page *scratch_page;
+ phys_addr_t scratch_page_dma;
+ int refcount;
+ /* Whether i915 needs to use the dmar apis or not. */
+ unsigned int needs_dmar : 1;
+ phys_addr_t gma_bus_addr;
+ /* Size of memory reserved for graphics by the BIOS */
+ unsigned int stolen_size;
+ /* Total number of gtt entries. */
+ unsigned int gtt_total_entries;
+ /* Part of the gtt that is mappable by the cpu, for those chips where
+ * this is not the full gtt. */
+ unsigned int gtt_mappable_entries;
+} 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
+
+#if IS_ENABLED(CONFIG_AGP_INTEL)
+static int intel_gtt_map_memory(struct page **pages,
+ unsigned int num_entries,
+ struct sg_table *st)
+{
+ struct scatterlist *sg;
+ int i;
+
+ DBG("try mapping %lu pages\n", (unsigned long)num_entries);
+
+ if (sg_alloc_table(st, num_entries, GFP_KERNEL))
+ goto err;
+
+ for_each_sg(st->sgl, sg, num_entries, i)
+ sg_set_page(sg, pages[i], PAGE_SIZE, 0);
+
+ if (!pci_map_sg(intel_private.pcidev,
+ st->sgl, st->nents, PCI_DMA_BIDIRECTIONAL))
+ goto err;
+
+ return 0;
+
+err:
+ sg_free_table(st);
+ return -ENOMEM;
+}
+
+static 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);
+}
+
+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;
+ }
+ 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);
+ __free_pages(page, 2);
+ atomic_dec(&agp_bridge->current_memory_agp);
+}
+#endif
+
+#define I810_GTT_ORDER 4
+static int i810_setup(void)
+{
+ phys_addr_t 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;
+
+ reg_addr = pci_resource_start(intel_private.pcidev, I810_MMADR_BAR);
+
+ 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_phys_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);
+}
+
+#if IS_ENABLED(CONFIG_AGP_INTEL)
+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);
+ }
+ wmb();
+
+ 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);
+}
+#endif
+
+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;
+ set_pages_uc(page, 1);
+
+ if (intel_private.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_relaxed(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 {
+ 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)
+{
+ if (IS_G33 || INTEL_GTT_GEN == 4 || INTEL_GTT_GEN == 5)
+ return i965_gtt_total_entries();
+ else {
+ /* On previous hardware, the GTT size was just what was
+ * required to map the aperture.
+ */
+ return intel_private.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);
+ __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();
+}
+
+/* Certain Gen5 chipsets require require idling the GPU before
+ * unmapping anything from the GTT when VT-d is enabled.
+ */
+static inline int needs_ilk_vtd_wa(void)
+{
+#ifdef CONFIG_INTEL_IOMMU
+ const unsigned short gpu_devid = intel_private.pcidev->device;
+
+ /* Query intel_iommu to see if we need the workaround. Presumably that
+ * was loaded first.
+ */
+ if ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_HB ||
+ gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG) &&
+ intel_iommu_gfx_mapped)
+ return 1;
+#endif
+ return 0;
+}
+
+static bool intel_gtt_can_wc(void)
+{
+ if (INTEL_GTT_GEN <= 2)
+ return false;
+
+ if (INTEL_GTT_GEN >= 6)
+ return false;
+
+ /* Reports of major corruption with ILK vt'd enabled */
+ if (needs_ilk_vtd_wa())
+ return false;
+
+ return true;
+}
+
+static int intel_gtt_init(void)
+{
+ u32 gtt_map_size;
+ int ret, bar;
+
+ ret = intel_private.driver->setup();
+ if (ret != 0)
+ return ret;
+
+ intel_private.gtt_mappable_entries = intel_gtt_mappable_entries();
+ intel_private.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.gtt_total_entries * 4,
+ intel_private.gtt_mappable_entries * 4);
+
+ gtt_map_size = intel_private.gtt_total_entries * 4;
+
+ intel_private.gtt = NULL;
+ if (intel_gtt_can_wc())
+ intel_private.gtt = ioremap_wc(intel_private.gtt_phys_addr,
+ gtt_map_size);
+ if (intel_private.gtt == NULL)
+ intel_private.gtt = ioremap(intel_private.gtt_phys_addr,
+ gtt_map_size);
+ if (intel_private.gtt == NULL) {
+ intel_private.driver->cleanup();
+ iounmap(intel_private.registers);
+ return -ENOMEM;
+ }
+
+#if IS_ENABLED(CONFIG_AGP_INTEL)
+ global_cache_flush(); /* FIXME: ? */
+#endif
+
+ intel_private.stolen_size = intel_gtt_stolen_size();
+
+ intel_private.needs_dmar = USE_PCI_DMA_API && INTEL_GTT_GEN > 2;
+
+ ret = intel_gtt_setup_scratch_page();
+ if (ret != 0) {
+ intel_gtt_cleanup();
+ return ret;
+ }
+
+ if (INTEL_GTT_GEN <= 2)
+ bar = I810_GMADR_BAR;
+ else
+ bar = I915_GMADR_BAR;
+
+ intel_private.gma_bus_addr = pci_bus_address(intel_private.pcidev, bar);
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_AGP_INTEL)
+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.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;
+}
+#endif
+
+static void i830_cleanup(void)
+{
+}
+
+/* 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 long timeout = jiffies + msecs_to_jiffies(1000);
+
+ /* Forcibly evict everything from the CPU write buffers.
+ * clflush appears to be insufficient.
+ */
+ wbinvd_on_all_cpus();
+
+ /* Now we've only seen documents for this magic bit on 855GM,
+ * we hope it exists for the other gen2 chipsets...
+ *
+ * Also works as advertised on my 845G.
+ */
+ writel(readl(intel_private.registers+I830_HIC) | (1<<31),
+ intel_private.registers+I830_HIC);
+
+ while (readl(intel_private.registers+I830_HIC) & (1<<31)) {
+ if (time_after(jiffies, timeout))
+ break;
+
+ udelay(50);
+ }
+}
+
+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_relaxed(addr | pte_flags, intel_private.gtt + entry);
+}
+
+bool intel_enable_gtt(void)
+{
+ u8 __iomem *reg;
+
+ 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;
+}
+EXPORT_SYMBOL(intel_enable_gtt);
+
+static int i830_setup(void)
+{
+ phys_addr_t reg_addr;
+
+ reg_addr = pci_resource_start(intel_private.pcidev, I810_MMADR_BAR);
+
+ intel_private.registers = ioremap(reg_addr, KB(64));
+ if (!intel_private.registers)
+ return -ENOMEM;
+
+ intel_private.gtt_phys_addr = reg_addr + I810_PTE_BASE;
+
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_AGP_INTEL)
+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)
+{
+ if (!intel_enable_gtt())
+ return -EIO;
+
+ intel_private.clear_fake_agp = true;
+ agp_bridge->gart_bus_addr = intel_private.gma_bus_addr;
+
+ return 0;
+}
+#endif
+
+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 sg_table *st,
+ 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(st->sgl, sg, st->nents, 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++;
+ }
+ }
+ wmb();
+}
+EXPORT_SYMBOL(intel_gtt_insert_sg_entries);
+
+#if IS_ENABLED(CONFIG_AGP_INTEL)
+static 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);
+ }
+ wmb();
+}
+
+static int intel_fake_agp_insert_entries(struct agp_memory *mem,
+ off_t pg_start, int type)
+{
+ int ret = -EINVAL;
+
+ if (intel_private.clear_fake_agp) {
+ int start = intel_private.stolen_size / PAGE_SIZE;
+ int end = intel_private.gtt_mappable_entries;
+ intel_gtt_clear_range(start, end - start);
+ intel_private.clear_fake_agp = false;
+ }
+
+ 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.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.needs_dmar) {
+ struct sg_table st;
+
+ ret = intel_gtt_map_memory(mem->pages, mem->page_count, &st);
+ if (ret != 0)
+ return ret;
+
+ intel_gtt_insert_sg_entries(&st, pg_start, type);
+ mem->sg_list = st.sgl;
+ mem->num_sg = st.nents;
+ } else
+ intel_gtt_insert_pages(pg_start, mem->page_count, mem->pages,
+ type);
+
+out:
+ ret = 0;
+out_err:
+ mem->is_flushed = true;
+ return ret;
+}
+#endif
+
+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);
+ }
+ wmb();
+}
+EXPORT_SYMBOL(intel_gtt_clear_range);
+
+#if IS_ENABLED(CONFIG_AGP_INTEL)
+static int intel_fake_agp_remove_entries(struct agp_memory *mem,
+ off_t pg_start, int type)
+{
+ if (mem->page_count == 0)
+ return 0;
+
+ intel_gtt_clear_range(pg_start, mem->page_count);
+
+ if (intel_private.needs_dmar) {
+ intel_gtt_unmap_memory(mem->sg_list, mem->num_sg);
+ mem->sg_list = NULL;
+ mem->num_sg = 0;
+ }
+
+ 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;
+}
+#endif
+
+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_relaxed(addr | pte_flags, intel_private.gtt + entry);
+}
+
+static int i9xx_setup(void)
+{
+ phys_addr_t reg_addr;
+ int size = KB(512);
+
+ reg_addr = pci_resource_start(intel_private.pcidev, I915_MMADR_BAR);
+
+ intel_private.registers = ioremap(reg_addr, size);
+ if (!intel_private.registers)
+ return -ENOMEM;
+
+ switch (INTEL_GTT_GEN) {
+ case 3:
+ intel_private.gtt_phys_addr =
+ pci_resource_start(intel_private.pcidev, I915_PTE_BAR);
+ break;
+ case 5:
+ intel_private.gtt_phys_addr = reg_addr + MB(2);
+ break;
+ default:
+ intel_private.gtt_phys_addr = reg_addr + KB(512);
+ break;
+ }
+
+ intel_i9xx_setup_flush();
+
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_AGP_INTEL)
+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,
+};
+#endif
+
+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,
+};
+
+/* 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, "845G",
+ &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 },
+ { 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 *bridge_pdev, struct pci_dev *gpu_pdev,
+ struct agp_bridge_data *bridge)
+{
+ int i, mask;
+
+ /*
+ * Can be called from the fake agp driver but also directly from
+ * drm/i915.ko. Hence we need to check whether everything is set up
+ * already.
+ */
+ if (intel_private.driver) {
+ intel_private.refcount++;
+ return 1;
+ }
+
+ for (i = 0; intel_gtt_chipsets[i].name != NULL; i++) {
+ if (gpu_pdev) {
+ if (gpu_pdev->device ==
+ intel_gtt_chipsets[i].gmch_chip_id) {
+ intel_private.pcidev = pci_dev_get(gpu_pdev);
+ intel_private.driver =
+ intel_gtt_chipsets[i].gtt_driver;
+
+ break;
+ }
+ } else 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;
+
+ intel_private.refcount++;
+
+#if IS_ENABLED(CONFIG_AGP_INTEL)
+ if (bridge) {
+ bridge->driver = &intel_fake_agp_driver;
+ bridge->dev_private_data = &intel_private;
+ bridge->dev = bridge_pdev;
+ }
+#endif
+
+ intel_private.bridge_dev = pci_dev_get(bridge_pdev);
+
+ dev_info(&bridge_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 (intel_gtt_init() != 0) {
+ intel_gmch_remove();
+
+ return 0;
+ }
+
+ return 1;
+}
+EXPORT_SYMBOL(intel_gmch_probe);
+
+void intel_gtt_get(size_t *gtt_total, size_t *stolen_size,
+ phys_addr_t *mappable_base, unsigned long *mappable_end)
+{
+ *gtt_total = intel_private.gtt_total_entries << PAGE_SHIFT;
+ *stolen_size = intel_private.stolen_size;
+ *mappable_base = intel_private.gma_bus_addr;
+ *mappable_end = intel_private.gtt_mappable_entries << PAGE_SHIFT;
+}
+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(void)
+{
+ if (--intel_private.refcount)
+ return;
+
+ if (intel_private.pcidev)
+ pci_dev_put(intel_private.pcidev);
+ if (intel_private.bridge_dev)
+ pci_dev_put(intel_private.bridge_dev);
+ intel_private.driver = NULL;
+}
+EXPORT_SYMBOL(intel_gmch_remove);
+
+MODULE_AUTHOR("Dave Jones, Various @Intel");
+MODULE_LICENSE("GPL and additional rights");
Code Review / kvmfornfv.git / blobdiff