diff options
Diffstat (limited to 'drivers/char/agp/intel-gtt.c')
| -rw-r--r-- | drivers/char/agp/intel-gtt.c | 1463 |
1 files changed, 1463 insertions, 0 deletions
diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c new file mode 100644 index 000000000..0941d38b2 --- /dev/null +++ b/drivers/char/agp/intel-gtt.c @@ -0,0 +1,1463 @@ +/* + * 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> +#include <asm/set_memory.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 */ + resource_size_t 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)) { + __free_page(page); + 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 resource_size_t intel_gtt_stolen_size(void) +{ + u16 gmch_ctrl; + u8 rdct; + int local = 0; + static const int ddt[4] = { 0, 16, 32, 64 }; + resource_size_t 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 %lluK %s memory\n", + (u64)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); + if (intel_private.needs_dmar) + 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_D_IG || + 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 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 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_page(dma_addr_t addr, + unsigned int pg, + unsigned int flags) +{ + intel_private.driver->write_entry(addr, pg, flags); + readl(intel_private.gtt + pg); + if (intel_private.driver->chipset_flush) + intel_private.driver->chipset_flush(); +} +EXPORT_SYMBOL(intel_gtt_insert_page); + +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++; + } + } + readl(intel_private.gtt + j - 1); + if (intel_private.driver->chipset_flush) + intel_private.driver->chipset_flush(); +} +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) +{ + wmb(); + 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; + + 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; + +#if IS_ENABLED(CONFIG_AGP_INTEL) + if (bridge) { + if (INTEL_GTT_GEN > 1) + return 0; + + bridge->driver = &intel_fake_agp_driver; + bridge->dev_private_data = &intel_private; + bridge->dev = bridge_pdev; + } +#endif + + + /* + * 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.refcount++) + return 1; + + 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(u64 *gtt_total, + phys_addr_t *mappable_base, + resource_size_t *mappable_end) +{ + *gtt_total = intel_private.gtt_total_entries << PAGE_SHIFT; + *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.scratch_page) + intel_gtt_teardown_scratch_page(); + 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"); |