--- /dev/null
+/*
+ * Copyright (c) 2007, Intel Corporation.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics.com>
+ * Alan Cox <alan@linux.intel.com>
+ */
+
+#include <drm/drmP.h>
+#include "psb_drv.h"
+
+
+/*
+ * GTT resource allocator - manage page mappings in GTT space
+ */
+
+/**
+ * psb_gtt_mask_pte - generate GTT pte entry
+ * @pfn: page number to encode
+ * @type: type of memory in the GTT
+ *
+ * Set the GTT entry for the appropriate memory type.
+ */
+static inline uint32_t psb_gtt_mask_pte(uint32_t pfn, int type)
+{
+ uint32_t mask = PSB_PTE_VALID;
+
+ if (type & PSB_MMU_CACHED_MEMORY)
+ mask |= PSB_PTE_CACHED;
+ if (type & PSB_MMU_RO_MEMORY)
+ mask |= PSB_PTE_RO;
+ if (type & PSB_MMU_WO_MEMORY)
+ mask |= PSB_PTE_WO;
+
+ return (pfn << PAGE_SHIFT) | mask;
+}
+
+/**
+ * psb_gtt_entry - find the GTT entries for a gtt_range
+ * @dev: our DRM device
+ * @r: our GTT range
+ *
+ * Given a gtt_range object return the GTT offset of the page table
+ * entries for this gtt_range
+ */
+u32 *psb_gtt_entry(struct drm_device *dev, struct gtt_range *r)
+{
+ struct drm_psb_private *dev_priv = dev->dev_private;
+ unsigned long offset;
+
+ offset = r->resource.start - dev_priv->gtt_mem->start;
+
+ return dev_priv->gtt_map + (offset >> PAGE_SHIFT);
+}
+
+/**
+ * psb_gtt_insert - put an object into the GTT
+ * @dev: our DRM device
+ * @r: our GTT range
+ *
+ * Take our preallocated GTT range and insert the GEM object into
+ * the GTT.
+ *
+ * FIXME: gtt lock ?
+ */
+static int psb_gtt_insert(struct drm_device *dev, struct gtt_range *r)
+{
+ u32 *gtt_slot, pte;
+ struct page **pages;
+ int i;
+
+ if (r->pages == NULL) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
+ WARN_ON(r->stolen); /* refcount these maybe ? */
+
+ gtt_slot = psb_gtt_entry(dev, r);
+ pages = r->pages;
+
+ /* Make sure changes are visible to the GPU */
+ set_pages_array_uc(pages, r->npage);
+
+ /* Write our page entries into the GTT itself */
+ for (i = 0; i < r->npage; i++) {
+ pte = psb_gtt_mask_pte(page_to_pfn(*pages++), 0/*type*/);
+ iowrite32(pte, gtt_slot++);
+ }
+ /* Make sure all the entries are set before we return */
+ ioread32(gtt_slot - 1);
+ return 0;
+}
+
+/**
+ * psb_gtt_remove - remove an object from the GTT
+ * @dev: our DRM device
+ * @r: our GTT range
+ *
+ * Remove a preallocated GTT range from the GTT. Overwrite all the
+ * page table entries with the dummy page
+ */
+
+static void psb_gtt_remove(struct drm_device *dev, struct gtt_range *r)
+{
+ struct drm_psb_private *dev_priv = dev->dev_private;
+ u32 *gtt_slot, pte;
+ int i;
+
+ WARN_ON(r->stolen);
+
+ gtt_slot = psb_gtt_entry(dev, r);
+ pte = psb_gtt_mask_pte(page_to_pfn(dev_priv->scratch_page), 0);
+
+ for (i = 0; i < r->npage; i++)
+ iowrite32(pte, gtt_slot++);
+ ioread32(gtt_slot - 1);
+ set_pages_array_wb(r->pages, r->npage);
+}
+
+/**
+ * psb_gtt_attach_pages - attach and pin GEM pages
+ * @gt: the gtt range
+ *
+ * Pin and build an in kernel list of the pages that back our GEM object.
+ * While we hold this the pages cannot be swapped out
+ */
+static int psb_gtt_attach_pages(struct gtt_range *gt)
+{
+ struct inode *inode;
+ struct address_space *mapping;
+ int i;
+ struct page *p;
+ int pages = gt->gem.size / PAGE_SIZE;
+
+ WARN_ON(gt->pages);
+
+ /* This is the shared memory object that backs the GEM resource */
+ inode = gt->gem.filp->f_path.dentry->d_inode;
+ mapping = inode->i_mapping;
+
+ gt->pages = kmalloc(pages * sizeof(struct page *), GFP_KERNEL);
+ if (gt->pages == NULL)
+ return -ENOMEM;
+ gt->npage = pages;
+
+ for (i = 0; i < pages; i++) {
+ /* FIXME: review flags later */
+ p = read_cache_page_gfp(mapping, i,
+ __GFP_COLD | GFP_KERNEL);
+ if (IS_ERR(p))
+ goto err;
+ gt->pages[i] = p;
+ }
+ return 0;
+
+err:
+ while (i--)
+ page_cache_release(gt->pages[i]);
+ kfree(gt->pages);
+ gt->pages = NULL;
+ return PTR_ERR(p);
+}
+
+/**
+ * psb_gtt_detach_pages - attach and pin GEM pages
+ * @gt: the gtt range
+ *
+ * Undo the effect of psb_gtt_attach_pages. At this point the pages
+ * must have been removed from the GTT as they could now be paged out
+ * and move bus address.
+ */
+static void psb_gtt_detach_pages(struct gtt_range *gt)
+{
+ int i;
+ for (i = 0; i < gt->npage; i++) {
+ /* FIXME: do we need to force dirty */
+ set_page_dirty(gt->pages[i]);
+ page_cache_release(gt->pages[i]);
+ }
+ kfree(gt->pages);
+ gt->pages = NULL;
+}
+
+/**
+ * psb_gtt_pin - pin pages into the GTT
+ * @gt: range to pin
+ *
+ * Pin a set of pages into the GTT. The pins are refcounted so that
+ * multiple pins need multiple unpins to undo.
+ *
+ * Non GEM backed objects treat this as a no-op as they are always GTT
+ * backed objects.
+ */
+int psb_gtt_pin(struct gtt_range *gt)
+{
+ int ret = 0;
+ struct drm_device *dev = gt->gem.dev;
+ struct drm_psb_private *dev_priv = dev->dev_private;
+
+ mutex_lock(&dev_priv->gtt_mutex);
+
+ if (gt->in_gart == 0 && gt->stolen == 0) {
+ ret = psb_gtt_attach_pages(gt);
+ if (ret < 0)
+ goto out;
+ ret = psb_gtt_insert(dev, gt);
+ if (ret < 0) {
+ psb_gtt_detach_pages(gt);
+ goto out;
+ }
+ }
+ gt->in_gart++;
+out:
+ mutex_unlock(&dev_priv->gtt_mutex);
+ return ret;
+}
+
+/**
+ * psb_gtt_unpin - Drop a GTT pin requirement
+ * @gt: range to pin
+ *
+ * Undoes the effect of psb_gtt_pin. On the last drop the GEM object
+ * will be removed from the GTT which will also drop the page references
+ * and allow the VM to clean up or page stuff.
+ *
+ * Non GEM backed objects treat this as a no-op as they are always GTT
+ * backed objects.
+ */
+void psb_gtt_unpin(struct gtt_range *gt)
+{
+ struct drm_device *dev = gt->gem.dev;
+ struct drm_psb_private *dev_priv = dev->dev_private;
+
+ mutex_lock(&dev_priv->gtt_mutex);
+
+ WARN_ON(!gt->in_gart);
+
+ gt->in_gart--;
+ if (gt->in_gart == 0 && gt->stolen == 0) {
+ psb_gtt_remove(dev, gt);
+ psb_gtt_detach_pages(gt);
+ }
+ mutex_unlock(&dev_priv->gtt_mutex);
+}
+
+/*
+ * GTT resource allocator - allocate and manage GTT address space
+ */
+
+/**
+ * psb_gtt_alloc_range - allocate GTT address space
+ * @dev: Our DRM device
+ * @len: length (bytes) of address space required
+ * @name: resource name
+ * @backed: resource should be backed by stolen pages
+ *
+ * Ask the kernel core to find us a suitable range of addresses
+ * to use for a GTT mapping.
+ *
+ * Returns a gtt_range structure describing the object, or NULL on
+ * error. On successful return the resource is both allocated and marked
+ * as in use.
+ */
+struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len,
+ const char *name, int backed)
+{
+ struct drm_psb_private *dev_priv = dev->dev_private;
+ struct gtt_range *gt;
+ struct resource *r = dev_priv->gtt_mem;
+ int ret;
+ unsigned long start, end;
+
+ if (backed) {
+ /* The start of the GTT is the stolen pages */
+ start = r->start;
+ end = r->start + dev_priv->gtt.stolen_size - 1;
+ } else {
+ /* The rest we will use for GEM backed objects */
+ start = r->start + dev_priv->gtt.stolen_size;
+ end = r->end;
+ }
+
+ gt = kzalloc(sizeof(struct gtt_range), GFP_KERNEL);
+ if (gt == NULL)
+ return NULL;
+ gt->resource.name = name;
+ gt->stolen = backed;
+ gt->in_gart = backed;
+ /* Ensure this is set for non GEM objects */
+ gt->gem.dev = dev;
+ ret = allocate_resource(dev_priv->gtt_mem, >->resource,
+ len, start, end, PAGE_SIZE, NULL, NULL);
+ if (ret == 0) {
+ gt->offset = gt->resource.start - r->start;
+ return gt;
+ }
+ kfree(gt);
+ return NULL;
+}
+
+/**
+ * psb_gtt_free_range - release GTT address space
+ * @dev: our DRM device
+ * @gt: a mapping created with psb_gtt_alloc_range
+ *
+ * Release a resource that was allocated with psb_gtt_alloc_range. If the
+ * object has been pinned by mmap users we clean this up here currently.
+ */
+void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt)
+{
+ /* Undo the mmap pin if we are destroying the object */
+ if (gt->mmapping) {
+ psb_gtt_unpin(gt);
+ gt->mmapping = 0;
+ }
+ WARN_ON(gt->in_gart && !gt->stolen);
+ release_resource(>->resource);
+ kfree(gt);
+}
+
+void psb_gtt_alloc(struct drm_device *dev)
+{
+ struct drm_psb_private *dev_priv = dev->dev_private;
+ init_rwsem(&dev_priv->gtt.sem);
+}
+
+void psb_gtt_takedown(struct drm_device *dev)
+{
+ struct drm_psb_private *dev_priv = dev->dev_private;
+
+ if (dev_priv->gtt_map) {
+ iounmap(dev_priv->gtt_map);
+ dev_priv->gtt_map = NULL;
+ }
+ if (dev_priv->gtt_initialized) {
+ pci_write_config_word(dev->pdev, PSB_GMCH_CTRL,
+ dev_priv->gmch_ctrl);
+ PSB_WVDC32(dev_priv->pge_ctl, PSB_PGETBL_CTL);
+ (void) PSB_RVDC32(PSB_PGETBL_CTL);
+ }
+ if (dev_priv->vram_addr)
+ iounmap(dev_priv->gtt_map);
+}
+
+int psb_gtt_init(struct drm_device *dev, int resume)
+{
+ struct drm_psb_private *dev_priv = dev->dev_private;
+ unsigned gtt_pages;
+ unsigned long stolen_size, vram_stolen_size;
+ unsigned i, num_pages;
+ unsigned pfn_base;
+ uint32_t vram_pages;
+ uint32_t dvmt_mode = 0;
+ struct psb_gtt *pg;
+
+ int ret = 0;
+ uint32_t pte;
+
+ mutex_init(&dev_priv->gtt_mutex);
+
+ psb_gtt_alloc(dev);
+ pg = &dev_priv->gtt;
+
+ /* Enable the GTT */
+ pci_read_config_word(dev->pdev, PSB_GMCH_CTRL, &dev_priv->gmch_ctrl);
+ pci_write_config_word(dev->pdev, PSB_GMCH_CTRL,
+ dev_priv->gmch_ctrl | _PSB_GMCH_ENABLED);
+
+ dev_priv->pge_ctl = PSB_RVDC32(PSB_PGETBL_CTL);
+ PSB_WVDC32(dev_priv->pge_ctl | _PSB_PGETBL_ENABLED, PSB_PGETBL_CTL);
+ (void) PSB_RVDC32(PSB_PGETBL_CTL);
+
+ /* The root resource we allocate address space from */
+ dev_priv->gtt_initialized = 1;
+
+ pg->gtt_phys_start = dev_priv->pge_ctl & PAGE_MASK;
+
+ /*
+ * FIXME: video mmu has hw bug to access 0x0D0000000,
+ * then make gatt start at 0x0e000,0000
+ */
+ pg->mmu_gatt_start = 0xE0000000;
+
+ pg->gtt_start = pci_resource_start(dev->pdev, PSB_GTT_RESOURCE);
+ gtt_pages = pci_resource_len(dev->pdev, PSB_GTT_RESOURCE)
+ >> PAGE_SHIFT;
+ /* CDV workaround */
+ if (pg->gtt_start == 0 || gtt_pages == 0) {
+ dev_err(dev->dev, "GTT PCI BAR not initialized.\n");
+ gtt_pages = 64;
+ pg->gtt_start = dev_priv->pge_ctl;
+ }
+
+ pg->gatt_start = pci_resource_start(dev->pdev, PSB_GATT_RESOURCE);
+ pg->gatt_pages = pci_resource_len(dev->pdev, PSB_GATT_RESOURCE)
+ >> PAGE_SHIFT;
+ dev_priv->gtt_mem = &dev->pdev->resource[PSB_GATT_RESOURCE];
+
+ if (pg->gatt_pages == 0 || pg->gatt_start == 0) {
+ static struct resource fudge; /* Preferably peppermint */
+
+ /* This can occur on CDV SDV systems. Fudge it in this case.
+ We really don't care what imaginary space is being allocated
+ at this point */
+ dev_err(dev->dev, "GATT PCI BAR not initialized.\n");
+ pg->gatt_start = 0x40000000;
+ pg->gatt_pages = (128 * 1024 * 1024) >> PAGE_SHIFT;
+ fudge.start = 0x40000000;
+ fudge.end = 0x40000000 + 128 * 1024 * 1024 - 1;
+ fudge.name = "fudge";
+ fudge.flags = IORESOURCE_MEM;
+ dev_priv->gtt_mem = &fudge;
+ }
+
+ pci_read_config_dword(dev->pdev, PSB_BSM, &dev_priv->stolen_base);
+ vram_stolen_size = pg->gtt_phys_start - dev_priv->stolen_base
+ - PAGE_SIZE;
+
+ stolen_size = vram_stolen_size;
+
+ printk(KERN_INFO "Stolen memory information\n");
+ printk(KERN_INFO " base in RAM: 0x%x\n", dev_priv->stolen_base);
+ printk(KERN_INFO " size: %luK, calculated by (GTT RAM base) - (Stolen base), seems wrong\n",
+ vram_stolen_size/1024);
+ dvmt_mode = (dev_priv->gmch_ctrl >> 4) & 0x7;
+ printk(KERN_INFO " the correct size should be: %dM(dvmt mode=%d)\n",
+ (dvmt_mode == 1) ? 1 : (2 << (dvmt_mode - 1)), dvmt_mode);
+
+ if (resume && (gtt_pages != pg->gtt_pages) &&
+ (stolen_size != pg->stolen_size)) {
+ dev_err(dev->dev, "GTT resume error.\n");
+ ret = -EINVAL;
+ goto out_err;
+ }
+
+ pg->gtt_pages = gtt_pages;
+ pg->stolen_size = stolen_size;
+ dev_priv->vram_stolen_size = vram_stolen_size;
+
+ /*
+ * Map the GTT and the stolen memory area
+ */
+ dev_priv->gtt_map = ioremap_nocache(pg->gtt_phys_start,
+ gtt_pages << PAGE_SHIFT);
+ if (!dev_priv->gtt_map) {
+ dev_err(dev->dev, "Failure to map gtt.\n");
+ ret = -ENOMEM;
+ goto out_err;
+ }
+
+ dev_priv->vram_addr = ioremap_wc(dev_priv->stolen_base, stolen_size);
+ if (!dev_priv->vram_addr) {
+ dev_err(dev->dev, "Failure to map stolen base.\n");
+ ret = -ENOMEM;
+ goto out_err;
+ }
+
+ /*
+ * Insert vram stolen pages into the GTT
+ */
+
+ pfn_base = dev_priv->stolen_base >> PAGE_SHIFT;
+ vram_pages = num_pages = vram_stolen_size >> PAGE_SHIFT;
+ printk(KERN_INFO"Set up %d stolen pages starting at 0x%08x, GTT offset %dK\n",
+ num_pages, pfn_base << PAGE_SHIFT, 0);
+ for (i = 0; i < num_pages; ++i) {
+ pte = psb_gtt_mask_pte(pfn_base + i, 0);
+ iowrite32(pte, dev_priv->gtt_map + i);
+ }
+
+ /*
+ * Init rest of GTT to the scratch page to avoid accidents or scribbles
+ */
+
+ pfn_base = page_to_pfn(dev_priv->scratch_page);
+ pte = psb_gtt_mask_pte(pfn_base, 0);
+ for (; i < gtt_pages; ++i)
+ iowrite32(pte, dev_priv->gtt_map + i);
+
+ (void) ioread32(dev_priv->gtt_map + i - 1);
+ return 0;
+
+out_err:
+ psb_gtt_takedown(dev);
+ return ret;
+}
--- /dev/null
+/**************************************************************************
+ * Copyright (c) 2007, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ **************************************************************************/
+#include <drm/drmP.h>
+#include "psb_drv.h"
+#include "psb_reg.h"
+
+/*
+ * Code for the SGX MMU:
+ */
+
+/*
+ * clflush on one processor only:
+ * clflush should apparently flush the cache line on all processors in an
+ * SMP system.
+ */
+
+/*
+ * kmap atomic:
+ * The usage of the slots must be completely encapsulated within a spinlock, and
+ * no other functions that may be using the locks for other purposed may be
+ * called from within the locked region.
+ * Since the slots are per processor, this will guarantee that we are the only
+ * user.
+ */
+
+/*
+ * TODO: Inserting ptes from an interrupt handler:
+ * This may be desirable for some SGX functionality where the GPU can fault in
+ * needed pages. For that, we need to make an atomic insert_pages function, that
+ * may fail.
+ * If it fails, the caller need to insert the page using a workqueue function,
+ * but on average it should be fast.
+ */
+
+struct psb_mmu_driver {
+ /* protects driver- and pd structures. Always take in read mode
+ * before taking the page table spinlock.
+ */
+ struct rw_semaphore sem;
+
+ /* protects page tables, directory tables and pt tables.
+ * and pt structures.
+ */
+ spinlock_t lock;
+
+ atomic_t needs_tlbflush;
+
+ uint8_t __iomem *register_map;
+ struct psb_mmu_pd *default_pd;
+ /*uint32_t bif_ctrl;*/
+ int has_clflush;
+ int clflush_add;
+ unsigned long clflush_mask;
+
+ struct drm_psb_private *dev_priv;
+};
+
+struct psb_mmu_pd;
+
+struct psb_mmu_pt {
+ struct psb_mmu_pd *pd;
+ uint32_t index;
+ uint32_t count;
+ struct page *p;
+ uint32_t *v;
+};
+
+struct psb_mmu_pd {
+ struct psb_mmu_driver *driver;
+ int hw_context;
+ struct psb_mmu_pt **tables;
+ struct page *p;
+ struct page *dummy_pt;
+ struct page *dummy_page;
+ uint32_t pd_mask;
+ uint32_t invalid_pde;
+ uint32_t invalid_pte;
+};
+
+static inline uint32_t psb_mmu_pt_index(uint32_t offset)
+{
+ return (offset >> PSB_PTE_SHIFT) & 0x3FF;
+}
+
+static inline uint32_t psb_mmu_pd_index(uint32_t offset)
+{
+ return offset >> PSB_PDE_SHIFT;
+}
+
+static inline void psb_clflush(void *addr)
+{
+ __asm__ __volatile__("clflush (%0)\n" : : "r"(addr) : "memory");
+}
+
+static inline void psb_mmu_clflush(struct psb_mmu_driver *driver,
+ void *addr)
+{
+ if (!driver->has_clflush)
+ return;
+
+ mb();
+ psb_clflush(addr);
+ mb();
+}
+
+static void psb_page_clflush(struct psb_mmu_driver *driver, struct page* page)
+{
+ uint32_t clflush_add = driver->clflush_add >> PAGE_SHIFT;
+ uint32_t clflush_count = PAGE_SIZE / clflush_add;
+ int i;
+ uint8_t *clf;
+
+ clf = kmap_atomic(page, KM_USER0);
+ mb();
+ for (i = 0; i < clflush_count; ++i) {
+ psb_clflush(clf);
+ clf += clflush_add;
+ }
+ mb();
+ kunmap_atomic(clf, KM_USER0);
+}
+
+static void psb_pages_clflush(struct psb_mmu_driver *driver,
+ struct page *page[], unsigned long num_pages)
+{
+ int i;
+
+ if (!driver->has_clflush)
+ return ;
+
+ for (i = 0; i < num_pages; i++)
+ psb_page_clflush(driver, *page++);
+}
+
+static void psb_mmu_flush_pd_locked(struct psb_mmu_driver *driver,
+ int force)
+{
+ atomic_set(&driver->needs_tlbflush, 0);
+}
+
+static void psb_mmu_flush_pd(struct psb_mmu_driver *driver, int force)
+{
+ down_write(&driver->sem);
+ psb_mmu_flush_pd_locked(driver, force);
+ up_write(&driver->sem);
+}
+
+void psb_mmu_flush(struct psb_mmu_driver *driver, int rc_prot)
+{
+ if (rc_prot)
+ down_write(&driver->sem);
+ if (rc_prot)
+ up_write(&driver->sem);
+}
+
+void psb_mmu_set_pd_context(struct psb_mmu_pd *pd, int hw_context)
+{
+ /*ttm_tt_cache_flush(&pd->p, 1);*/
+ psb_pages_clflush(pd->driver, &pd->p, 1);
+ down_write(&pd->driver->sem);
+ wmb();
+ psb_mmu_flush_pd_locked(pd->driver, 1);
+ pd->hw_context = hw_context;
+ up_write(&pd->driver->sem);
+
+}
+
+static inline unsigned long psb_pd_addr_end(unsigned long addr,
+ unsigned long end)
+{
+
+ addr = (addr + PSB_PDE_MASK + 1) & ~PSB_PDE_MASK;
+ return (addr < end) ? addr : end;
+}
+
+static inline uint32_t psb_mmu_mask_pte(uint32_t pfn, int type)
+{
+ uint32_t mask = PSB_PTE_VALID;
+
+ if (type & PSB_MMU_CACHED_MEMORY)
+ mask |= PSB_PTE_CACHED;
+ if (type & PSB_MMU_RO_MEMORY)
+ mask |= PSB_PTE_RO;
+ if (type & PSB_MMU_WO_MEMORY)
+ mask |= PSB_PTE_WO;
+
+ return (pfn << PAGE_SHIFT) | mask;
+}
+
+struct psb_mmu_pd *psb_mmu_alloc_pd(struct psb_mmu_driver *driver,
+ int trap_pagefaults, int invalid_type)
+{
+ struct psb_mmu_pd *pd = kmalloc(sizeof(*pd), GFP_KERNEL);
+ uint32_t *v;
+ int i;
+
+ if (!pd)
+ return NULL;
+
+ pd->p = alloc_page(GFP_DMA32);
+ if (!pd->p)
+ goto out_err1;
+ pd->dummy_pt = alloc_page(GFP_DMA32);
+ if (!pd->dummy_pt)
+ goto out_err2;
+ pd->dummy_page = alloc_page(GFP_DMA32);
+ if (!pd->dummy_page)
+ goto out_err3;
+
+ if (!trap_pagefaults) {
+ pd->invalid_pde =
+ psb_mmu_mask_pte(page_to_pfn(pd->dummy_pt),
+ invalid_type);
+ pd->invalid_pte =
+ psb_mmu_mask_pte(page_to_pfn(pd->dummy_page),
+ invalid_type);
+ } else {
+ pd->invalid_pde = 0;
+ pd->invalid_pte = 0;
+ }
+
+ v = kmap(pd->dummy_pt);
+ for (i = 0; i < (PAGE_SIZE / sizeof(uint32_t)); ++i)
+ v[i] = pd->invalid_pte;
+
+ kunmap(pd->dummy_pt);
+
+ v = kmap(pd->p);
+ for (i = 0; i < (PAGE_SIZE / sizeof(uint32_t)); ++i)
+ v[i] = pd->invalid_pde;
+
+ kunmap(pd->p);
+
+ clear_page(kmap(pd->dummy_page));
+ kunmap(pd->dummy_page);
+
+ pd->tables = vmalloc_user(sizeof(struct psb_mmu_pt *) * 1024);
+ if (!pd->tables)
+ goto out_err4;
+
+ pd->hw_context = -1;
+ pd->pd_mask = PSB_PTE_VALID;
+ pd->driver = driver;
+
+ return pd;
+
+out_err4:
+ __free_page(pd->dummy_page);
+out_err3:
+ __free_page(pd->dummy_pt);
+out_err2:
+ __free_page(pd->p);
+out_err1:
+ kfree(pd);
+ return NULL;
+}
+
+void psb_mmu_free_pt(struct psb_mmu_pt *pt)
+{
+ __free_page(pt->p);
+ kfree(pt);
+}
+
+void psb_mmu_free_pagedir(struct psb_mmu_pd *pd)
+{
+ struct psb_mmu_driver *driver = pd->driver;
+ struct psb_mmu_pt *pt;
+ int i;
+
+ down_write(&driver->sem);
+ if (pd->hw_context != -1)
+ psb_mmu_flush_pd_locked(driver, 1);
+
+ /* Should take the spinlock here, but we don't need to do that
+ since we have the semaphore in write mode. */
+
+ for (i = 0; i < 1024; ++i) {
+ pt = pd->tables[i];
+ if (pt)
+ psb_mmu_free_pt(pt);
+ }
+
+ vfree(pd->tables);
+ __free_page(pd->dummy_page);
+ __free_page(pd->dummy_pt);
+ __free_page(pd->p);
+ kfree(pd);
+ up_write(&driver->sem);
+}
+
+static struct psb_mmu_pt *psb_mmu_alloc_pt(struct psb_mmu_pd *pd)
+{
+ struct psb_mmu_pt *pt = kmalloc(sizeof(*pt), GFP_KERNEL);
+ void *v;
+ uint32_t clflush_add = pd->driver->clflush_add >> PAGE_SHIFT;
+ uint32_t clflush_count = PAGE_SIZE / clflush_add;
+ spinlock_t *lock = &pd->driver->lock;
+ uint8_t *clf;
+ uint32_t *ptes;
+ int i;
+
+ if (!pt)
+ return NULL;
+
+ pt->p = alloc_page(GFP_DMA32);
+ if (!pt->p) {
+ kfree(pt);
+ return NULL;
+ }
+
+ spin_lock(lock);
+
+ v = kmap_atomic(pt->p, KM_USER0);
+ clf = (uint8_t *) v;
+ ptes = (uint32_t *) v;
+ for (i = 0; i < (PAGE_SIZE / sizeof(uint32_t)); ++i)
+ *ptes++ = pd->invalid_pte;
+
+
+ if (pd->driver->has_clflush && pd->hw_context != -1) {
+ mb();
+ for (i = 0; i < clflush_count; ++i) {
+ psb_clflush(clf);
+ clf += clflush_add;
+ }
+ mb();
+ }
+
+ kunmap_atomic(v, KM_USER0);
+ spin_unlock(lock);
+
+ pt->count = 0;
+ pt->pd = pd;
+ pt->index = 0;
+
+ return pt;
+}
+
+struct psb_mmu_pt *psb_mmu_pt_alloc_map_lock(struct psb_mmu_pd *pd,
+ unsigned long addr)
+{
+ uint32_t index = psb_mmu_pd_index(addr);
+ struct psb_mmu_pt *pt;
+ uint32_t *v;
+ spinlock_t *lock = &pd->driver->lock;
+
+ spin_lock(lock);
+ pt = pd->tables[index];
+ while (!pt) {
+ spin_unlock(lock);
+ pt = psb_mmu_alloc_pt(pd);
+ if (!pt)
+ return NULL;
+ spin_lock(lock);
+
+ if (pd->tables[index]) {
+ spin_unlock(lock);
+ psb_mmu_free_pt(pt);
+ spin_lock(lock);
+ pt = pd->tables[index];
+ continue;
+ }
+
+ v = kmap_atomic(pd->p, KM_USER0);
+ pd->tables[index] = pt;
+ v[index] = (page_to_pfn(pt->p) << 12) | pd->pd_mask;
+ pt->index = index;
+ kunmap_atomic((void *) v, KM_USER0);
+
+ if (pd->hw_context != -1) {
+ psb_mmu_clflush(pd->driver, (void *) &v[index]);
+ atomic_set(&pd->driver->needs_tlbflush, 1);
+ }
+ }
+ pt->v = kmap_atomic(pt->p, KM_USER0);
+ return pt;
+}
+
+static struct psb_mmu_pt *psb_mmu_pt_map_lock(struct psb_mmu_pd *pd,
+ unsigned long addr)
+{
+ uint32_t index = psb_mmu_pd_index(addr);
+ struct psb_mmu_pt *pt;
+ spinlock_t *lock = &pd->driver->lock;
+
+ spin_lock(lock);
+ pt = pd->tables[index];
+ if (!pt) {
+ spin_unlock(lock);
+ return NULL;
+ }
+ pt->v = kmap_atomic(pt->p, KM_USER0);
+ return pt;
+}
+
+static void psb_mmu_pt_unmap_unlock(struct psb_mmu_pt *pt)
+{
+ struct psb_mmu_pd *pd = pt->pd;
+ uint32_t *v;
+
+ kunmap_atomic(pt->v, KM_USER0);
+ if (pt->count == 0) {
+ v = kmap_atomic(pd->p, KM_USER0);
+ v[pt->index] = pd->invalid_pde;
+ pd->tables[pt->index] = NULL;
+
+ if (pd->hw_context != -1) {
+ psb_mmu_clflush(pd->driver,
+ (void *) &v[pt->index]);
+ atomic_set(&pd->driver->needs_tlbflush, 1);
+ }
+ kunmap_atomic(pt->v, KM_USER0);
+ spin_unlock(&pd->driver->lock);
+ psb_mmu_free_pt(pt);
+ return;
+ }
+ spin_unlock(&pd->driver->lock);
+}
+
+static inline void psb_mmu_set_pte(struct psb_mmu_pt *pt,
+ unsigned long addr, uint32_t pte)
+{
+ pt->v[psb_mmu_pt_index(addr)] = pte;
+}
+
+static inline void psb_mmu_invalidate_pte(struct psb_mmu_pt *pt,
+ unsigned long addr)
+{
+ pt->v[psb_mmu_pt_index(addr)] = pt->pd->invalid_pte;
+}
+
+
+void psb_mmu_mirror_gtt(struct psb_mmu_pd *pd,
+ uint32_t mmu_offset, uint32_t gtt_start,
+ uint32_t gtt_pages)
+{
+ uint32_t *v;
+ uint32_t start = psb_mmu_pd_index(mmu_offset);
+ struct psb_mmu_driver *driver = pd->driver;
+ int num_pages = gtt_pages;
+
+ down_read(&driver->sem);
+ spin_lock(&driver->lock);
+
+ v = kmap_atomic(pd->p, KM_USER0);
+ v += start;
+
+ while (gtt_pages--) {
+ *v++ = gtt_start | pd->pd_mask;
+ gtt_start += PAGE_SIZE;
+ }
+
+ /*ttm_tt_cache_flush(&pd->p, num_pages);*/
+ psb_pages_clflush(pd->driver, &pd->p, num_pages);
+ kunmap_atomic(v, KM_USER0);
+ spin_unlock(&driver->lock);
+
+ if (pd->hw_context != -1)
+ atomic_set(&pd->driver->needs_tlbflush, 1);
+
+ up_read(&pd->driver->sem);
+ psb_mmu_flush_pd(pd->driver, 0);
+}
+
+struct psb_mmu_pd *psb_mmu_get_default_pd(struct psb_mmu_driver *driver)
+{
+ struct psb_mmu_pd *pd;
+
+ /* down_read(&driver->sem); */
+ pd = driver->default_pd;
+ /* up_read(&driver->sem); */
+
+ return pd;
+}
+
+/* Returns the physical address of the PD shared by sgx/msvdx */
+uint32_t psb_get_default_pd_addr(struct psb_mmu_driver *driver)
+{
+ struct psb_mmu_pd *pd;
+
+ pd = psb_mmu_get_default_pd(driver);
+ return page_to_pfn(pd->p) << PAGE_SHIFT;
+}
+
+void psb_mmu_driver_takedown(struct psb_mmu_driver *driver)
+{
+ psb_mmu_free_pagedir(driver->default_pd);
+ kfree(driver);
+}
+
+struct psb_mmu_driver *psb_mmu_driver_init(uint8_t __iomem * registers,
+ int trap_pagefaults,
+ int invalid_type,
+ struct drm_psb_private *dev_priv)
+{
+ struct psb_mmu_driver *driver;
+
+ driver = kmalloc(sizeof(*driver), GFP_KERNEL);
+
+ if (!driver)
+ return NULL;
+ driver->dev_priv = dev_priv;
+
+ driver->default_pd = psb_mmu_alloc_pd(driver, trap_pagefaults,
+ invalid_type);
+ if (!driver->default_pd)
+ goto out_err1;
+
+ spin_lock_init(&driver->lock);
+ init_rwsem(&driver->sem);
+ down_write(&driver->sem);
+ driver->register_map = registers;
+ atomic_set(&driver->needs_tlbflush, 1);
+
+ driver->has_clflush = 0;
+
+ if (boot_cpu_has(X86_FEATURE_CLFLSH)) {
+ uint32_t tfms, misc, cap0, cap4, clflush_size;
+
+ /*
+ * clflush size is determined at kernel setup for x86_64
+ * but not for i386. We have to do it here.
+ */
+
+ cpuid(0x00000001, &tfms, &misc, &cap0, &cap4);
+ clflush_size = ((misc >> 8) & 0xff) * 8;
+ driver->has_clflush = 1;
+ driver->clflush_add =
+ PAGE_SIZE * clflush_size / sizeof(uint32_t);
+ driver->clflush_mask = driver->clflush_add - 1;
+ driver->clflush_mask = ~driver->clflush_mask;
+ }
+
+ up_write(&driver->sem);
+ return driver;
+
+out_err1:
+ kfree(driver);
+ return NULL;
+}
+
+static void psb_mmu_flush_ptes(struct psb_mmu_pd *pd,
+ unsigned long address, uint32_t num_pages,
+ uint32_t desired_tile_stride,
+ uint32_t hw_tile_stride)
+{
+ struct psb_mmu_pt *pt;
+ uint32_t rows = 1;
+ uint32_t i;
+ unsigned long addr;
+ unsigned long end;
+ unsigned long next;
+ unsigned long add;
+ unsigned long row_add;
+ unsigned long clflush_add = pd->driver->clflush_add;
+ unsigned long clflush_mask = pd->driver->clflush_mask;
+
+ if (!pd->driver->has_clflush) {
+ /*ttm_tt_cache_flush(&pd->p, num_pages);*/
+ psb_pages_clflush(pd->driver, &pd->p, num_pages);
+ return;
+ }
+
+ if (hw_tile_stride)
+ rows = num_pages / desired_tile_stride;
+ else
+ desired_tile_stride = num_pages;
+
+ add = desired_tile_stride << PAGE_SHIFT;
+ row_add = hw_tile_stride << PAGE_SHIFT;
+ mb();
+ for (i = 0; i < rows; ++i) {
+
+ addr = address;
+ end = addr + add;
+
+ do {
+ next = psb_pd_addr_end(addr, end);
+ pt = psb_mmu_pt_map_lock(pd, addr);
+ if (!pt)
+ continue;
+ do {
+ psb_clflush(&pt->v
+ [psb_mmu_pt_index(addr)]);
+ } while (addr +=
+ clflush_add,
+ (addr & clflush_mask) < next);
+
+ psb_mmu_pt_unmap_unlock(pt);
+ } while (addr = next, next != end);
+ address += row_add;
+ }
+ mb();
+}
+
+void psb_mmu_remove_pfn_sequence(struct psb_mmu_pd *pd,
+ unsigned long address, uint32_t num_pages)
+{
+ struct psb_mmu_pt *pt;
+ unsigned long addr;
+ unsigned long end;
+ unsigned long next;
+ unsigned long f_address = address;
+
+ down_read(&pd->driver->sem);
+
+ addr = address;
+ end = addr + (num_pages << PAGE_SHIFT);
+
+ do {
+ next = psb_pd_addr_end(addr, end);
+ pt = psb_mmu_pt_alloc_map_lock(pd, addr);
+ if (!pt)
+ goto out;
+ do {
+ psb_mmu_invalidate_pte(pt, addr);
+ --pt->count;
+ } while (addr += PAGE_SIZE, addr < next);
+ psb_mmu_pt_unmap_unlock(pt);
+
+ } while (addr = next, next != end);
+
+out:
+ if (pd->hw_context != -1)
+ psb_mmu_flush_ptes(pd, f_address, num_pages, 1, 1);
+
+ up_read(&pd->driver->sem);
+
+ if (pd->hw_context != -1)
+ psb_mmu_flush(pd->driver, 0);
+
+ return;
+}
+
+void psb_mmu_remove_pages(struct psb_mmu_pd *pd, unsigned long address,
+ uint32_t num_pages, uint32_t desired_tile_stride,
+ uint32_t hw_tile_stride)
+{
+ struct psb_mmu_pt *pt;
+ uint32_t rows = 1;
+ uint32_t i;
+ unsigned long addr;
+ unsigned long end;
+ unsigned long next;
+ unsigned long add;
+ unsigned long row_add;
+ unsigned long f_address = address;
+
+ if (hw_tile_stride)
+ rows = num_pages / desired_tile_stride;
+ else
+ desired_tile_stride = num_pages;
+
+ add = desired_tile_stride << PAGE_SHIFT;
+ row_add = hw_tile_stride << PAGE_SHIFT;
+
+ /* down_read(&pd->driver->sem); */
+
+ /* Make sure we only need to flush this processor's cache */
+
+ for (i = 0; i < rows; ++i) {
+
+ addr = address;
+ end = addr + add;
+
+ do {
+ next = psb_pd_addr_end(addr, end);
+ pt = psb_mmu_pt_map_lock(pd, addr);
+ if (!pt)
+ continue;
+ do {
+ psb_mmu_invalidate_pte(pt, addr);
+ --pt->count;
+
+ } while (addr += PAGE_SIZE, addr < next);
+ psb_mmu_pt_unmap_unlock(pt);
+
+ } while (addr = next, next != end);
+ address += row_add;
+ }
+ if (pd->hw_context != -1)
+ psb_mmu_flush_ptes(pd, f_address, num_pages,
+ desired_tile_stride, hw_tile_stride);
+
+ /* up_read(&pd->driver->sem); */
+
+ if (pd->hw_context != -1)
+ psb_mmu_flush(pd->driver, 0);
+}
+
+int psb_mmu_insert_pfn_sequence(struct psb_mmu_pd *pd, uint32_t start_pfn,
+ unsigned long address, uint32_t num_pages,
+ int type)
+{
+ struct psb_mmu_pt *pt;
+ uint32_t pte;
+ unsigned long addr;
+ unsigned long end;
+ unsigned long next;
+ unsigned long f_address = address;
+ int ret = 0;
+
+ down_read(&pd->driver->sem);
+
+ addr = address;
+ end = addr + (num_pages << PAGE_SHIFT);
+
+ do {
+ next = psb_pd_addr_end(addr, end);
+ pt = psb_mmu_pt_alloc_map_lock(pd, addr);
+ if (!pt) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ do {
+ pte = psb_mmu_mask_pte(start_pfn++, type);
+ psb_mmu_set_pte(pt, addr, pte);
+ pt->count++;
+ } while (addr += PAGE_SIZE, addr < next);
+ psb_mmu_pt_unmap_unlock(pt);
+
+ } while (addr = next, next != end);
+
+out:
+ if (pd->hw_context != -1)
+ psb_mmu_flush_ptes(pd, f_address, num_pages, 1, 1);
+
+ up_read(&pd->driver->sem);
+
+ if (pd->hw_context != -1)
+ psb_mmu_flush(pd->driver, 1);
+
+ return ret;
+}
+
+int psb_mmu_insert_pages(struct psb_mmu_pd *pd, struct page **pages,
+ unsigned long address, uint32_t num_pages,
+ uint32_t desired_tile_stride,
+ uint32_t hw_tile_stride, int type)
+{
+ struct psb_mmu_pt *pt;
+ uint32_t rows = 1;
+ uint32_t i;
+ uint32_t pte;
+ unsigned long addr;
+ unsigned long end;
+ unsigned long next;
+ unsigned long add;
+ unsigned long row_add;
+ unsigned long f_address = address;
+ int ret = 0;
+
+ if (hw_tile_stride) {
+ if (num_pages % desired_tile_stride != 0)
+ return -EINVAL;
+ rows = num_pages / desired_tile_stride;
+ } else {
+ desired_tile_stride = num_pages;
+ }
+
+ add = desired_tile_stride << PAGE_SHIFT;
+ row_add = hw_tile_stride << PAGE_SHIFT;
+
+ down_read(&pd->driver->sem);
+
+ for (i = 0; i < rows; ++i) {
+
+ addr = address;
+ end = addr + add;
+
+ do {
+ next = psb_pd_addr_end(addr, end);
+ pt = psb_mmu_pt_alloc_map_lock(pd, addr);
+ if (!pt) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ do {
+ pte =
+ psb_mmu_mask_pte(page_to_pfn(*pages++),
+ type);
+ psb_mmu_set_pte(pt, addr, pte);
+ pt->count++;
+ } while (addr += PAGE_SIZE, addr < next);
+ psb_mmu_pt_unmap_unlock(pt);
+
+ } while (addr = next, next != end);
+
+ address += row_add;
+ }
+out:
+ if (pd->hw_context != -1)
+ psb_mmu_flush_ptes(pd, f_address, num_pages,
+ desired_tile_stride, hw_tile_stride);
+
+ up_read(&pd->driver->sem);
+
+ if (pd->hw_context != -1)
+ psb_mmu_flush(pd->driver, 1);
+
+ return ret;
+}
+
+int psb_mmu_virtual_to_pfn(struct psb_mmu_pd *pd, uint32_t virtual,
+ unsigned long *pfn)
+{
+ int ret;
+ struct psb_mmu_pt *pt;
+ uint32_t tmp;
+ spinlock_t *lock = &pd->driver->lock;
+
+ down_read(&pd->driver->sem);
+ pt = psb_mmu_pt_map_lock(pd, virtual);
+ if (!pt) {
+ uint32_t *v;
+
+ spin_lock(lock);
+ v = kmap_atomic(pd->p, KM_USER0);
+ tmp = v[psb_mmu_pd_index(virtual)];
+ kunmap_atomic(v, KM_USER0);
+ spin_unlock(lock);
+
+ if (tmp != pd->invalid_pde || !(tmp & PSB_PTE_VALID) ||
+ !(pd->invalid_pte & PSB_PTE_VALID)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ ret = 0;
+ *pfn = pd->invalid_pte >> PAGE_SHIFT;
+ goto out;
+ }
+ tmp = pt->v[psb_mmu_pt_index(virtual)];
+ if (!(tmp & PSB_PTE_VALID)) {
+ ret = -EINVAL;
+ } else {
+ ret = 0;
+ *pfn = tmp >> PAGE_SHIFT;
+ }
+ psb_mmu_pt_unmap_unlock(pt);
+out:
+ up_read(&pd->driver->sem);
+ return ret;
+}
projects / deliverable / linux.git / commitdiff
