diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gvt/gtt.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gvt/gtt.c | 2232 |
1 files changed, 2232 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c new file mode 100644 index 000000000000..2cc761328569 --- /dev/null +++ b/drivers/gpu/drm/i915/gvt/gtt.c @@ -0,0 +1,2232 @@ +/* + * GTT virtualization + * + * Copyright(c) 2011-2016 Intel Corporation. All rights reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * Authors: + * Zhi Wang <zhi.a.wang@intel.com> + * Zhenyu Wang <zhenyuw@linux.intel.com> + * Xiao Zheng <xiao.zheng@intel.com> + * + * Contributors: + * Min He <min.he@intel.com> + * Bing Niu <bing.niu@intel.com> + * + */ + +#include "i915_drv.h" +#include "gvt.h" +#include "i915_pvinfo.h" +#include "trace.h" + +static bool enable_out_of_sync = false; +static int preallocated_oos_pages = 8192; + +/* + * validate a gm address and related range size, + * translate it to host gm address + */ +bool intel_gvt_ggtt_validate_range(struct intel_vgpu *vgpu, u64 addr, u32 size) +{ + if ((!vgpu_gmadr_is_valid(vgpu, addr)) || (size + && !vgpu_gmadr_is_valid(vgpu, addr + size - 1))) { + gvt_err("vgpu%d: invalid range gmadr 0x%llx size 0x%x\n", + vgpu->id, addr, size); + return false; + } + return true; +} + +/* translate a guest gmadr to host gmadr */ +int intel_gvt_ggtt_gmadr_g2h(struct intel_vgpu *vgpu, u64 g_addr, u64 *h_addr) +{ + if (WARN(!vgpu_gmadr_is_valid(vgpu, g_addr), + "invalid guest gmadr %llx\n", g_addr)) + return -EACCES; + + if (vgpu_gmadr_is_aperture(vgpu, g_addr)) + *h_addr = vgpu_aperture_gmadr_base(vgpu) + + (g_addr - vgpu_aperture_offset(vgpu)); + else + *h_addr = vgpu_hidden_gmadr_base(vgpu) + + (g_addr - vgpu_hidden_offset(vgpu)); + return 0; +} + +/* translate a host gmadr to guest gmadr */ +int intel_gvt_ggtt_gmadr_h2g(struct intel_vgpu *vgpu, u64 h_addr, u64 *g_addr) +{ + if (WARN(!gvt_gmadr_is_valid(vgpu->gvt, h_addr), + "invalid host gmadr %llx\n", h_addr)) + return -EACCES; + + if (gvt_gmadr_is_aperture(vgpu->gvt, h_addr)) + *g_addr = vgpu_aperture_gmadr_base(vgpu) + + (h_addr - gvt_aperture_gmadr_base(vgpu->gvt)); + else + *g_addr = vgpu_hidden_gmadr_base(vgpu) + + (h_addr - gvt_hidden_gmadr_base(vgpu->gvt)); + return 0; +} + +int intel_gvt_ggtt_index_g2h(struct intel_vgpu *vgpu, unsigned long g_index, + unsigned long *h_index) +{ + u64 h_addr; + int ret; + + ret = intel_gvt_ggtt_gmadr_g2h(vgpu, g_index << GTT_PAGE_SHIFT, + &h_addr); + if (ret) + return ret; + + *h_index = h_addr >> GTT_PAGE_SHIFT; + return 0; +} + +int intel_gvt_ggtt_h2g_index(struct intel_vgpu *vgpu, unsigned long h_index, + unsigned long *g_index) +{ + u64 g_addr; + int ret; + + ret = intel_gvt_ggtt_gmadr_h2g(vgpu, h_index << GTT_PAGE_SHIFT, + &g_addr); + if (ret) + return ret; + + *g_index = g_addr >> GTT_PAGE_SHIFT; + return 0; +} + +#define gtt_type_is_entry(type) \ + (type > GTT_TYPE_INVALID && type < GTT_TYPE_PPGTT_ENTRY \ + && type != GTT_TYPE_PPGTT_PTE_ENTRY \ + && type != GTT_TYPE_PPGTT_ROOT_ENTRY) + +#define gtt_type_is_pt(type) \ + (type >= GTT_TYPE_PPGTT_PTE_PT && type < GTT_TYPE_MAX) + +#define gtt_type_is_pte_pt(type) \ + (type == GTT_TYPE_PPGTT_PTE_PT) + +#define gtt_type_is_root_pointer(type) \ + (gtt_type_is_entry(type) && type > GTT_TYPE_PPGTT_ROOT_ENTRY) + +#define gtt_init_entry(e, t, p, v) do { \ + (e)->type = t; \ + (e)->pdev = p; \ + memcpy(&(e)->val64, &v, sizeof(v)); \ +} while (0) + +enum { + GTT_TYPE_INVALID = -1, + + GTT_TYPE_GGTT_PTE, + + GTT_TYPE_PPGTT_PTE_4K_ENTRY, + GTT_TYPE_PPGTT_PTE_2M_ENTRY, + GTT_TYPE_PPGTT_PTE_1G_ENTRY, + + GTT_TYPE_PPGTT_PTE_ENTRY, + + GTT_TYPE_PPGTT_PDE_ENTRY, + GTT_TYPE_PPGTT_PDP_ENTRY, + GTT_TYPE_PPGTT_PML4_ENTRY, + + GTT_TYPE_PPGTT_ROOT_ENTRY, + + GTT_TYPE_PPGTT_ROOT_L3_ENTRY, + GTT_TYPE_PPGTT_ROOT_L4_ENTRY, + + GTT_TYPE_PPGTT_ENTRY, + + GTT_TYPE_PPGTT_PTE_PT, + GTT_TYPE_PPGTT_PDE_PT, + GTT_TYPE_PPGTT_PDP_PT, + GTT_TYPE_PPGTT_PML4_PT, + + GTT_TYPE_MAX, +}; + +/* + * Mappings between GTT_TYPE* enumerations. + * Following information can be found according to the given type: + * - type of next level page table + * - type of entry inside this level page table + * - type of entry with PSE set + * + * If the given type doesn't have such a kind of information, + * e.g. give a l4 root entry type, then request to get its PSE type, + * give a PTE page table type, then request to get its next level page + * table type, as we know l4 root entry doesn't have a PSE bit, + * and a PTE page table doesn't have a next level page table type, + * GTT_TYPE_INVALID will be returned. This is useful when traversing a + * page table. + */ + +struct gtt_type_table_entry { + int entry_type; + int next_pt_type; + int pse_entry_type; +}; + +#define GTT_TYPE_TABLE_ENTRY(type, e_type, npt_type, pse_type) \ + [type] = { \ + .entry_type = e_type, \ + .next_pt_type = npt_type, \ + .pse_entry_type = pse_type, \ + } + +static struct gtt_type_table_entry gtt_type_table[] = { + GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_ROOT_L4_ENTRY, + GTT_TYPE_PPGTT_ROOT_L4_ENTRY, + GTT_TYPE_PPGTT_PML4_PT, + GTT_TYPE_INVALID), + GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PML4_PT, + GTT_TYPE_PPGTT_PML4_ENTRY, + GTT_TYPE_PPGTT_PDP_PT, + GTT_TYPE_INVALID), + GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PML4_ENTRY, + GTT_TYPE_PPGTT_PML4_ENTRY, + GTT_TYPE_PPGTT_PDP_PT, + GTT_TYPE_INVALID), + GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PDP_PT, + GTT_TYPE_PPGTT_PDP_ENTRY, + GTT_TYPE_PPGTT_PDE_PT, + GTT_TYPE_PPGTT_PTE_1G_ENTRY), + GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_ROOT_L3_ENTRY, + GTT_TYPE_PPGTT_ROOT_L3_ENTRY, + GTT_TYPE_PPGTT_PDE_PT, + GTT_TYPE_PPGTT_PTE_1G_ENTRY), + GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PDP_ENTRY, + GTT_TYPE_PPGTT_PDP_ENTRY, + GTT_TYPE_PPGTT_PDE_PT, + GTT_TYPE_PPGTT_PTE_1G_ENTRY), + GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PDE_PT, + GTT_TYPE_PPGTT_PDE_ENTRY, + GTT_TYPE_PPGTT_PTE_PT, + GTT_TYPE_PPGTT_PTE_2M_ENTRY), + GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PDE_ENTRY, + GTT_TYPE_PPGTT_PDE_ENTRY, + GTT_TYPE_PPGTT_PTE_PT, + GTT_TYPE_PPGTT_PTE_2M_ENTRY), + GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PTE_PT, + GTT_TYPE_PPGTT_PTE_4K_ENTRY, + GTT_TYPE_INVALID, + GTT_TYPE_INVALID), + GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PTE_4K_ENTRY, + GTT_TYPE_PPGTT_PTE_4K_ENTRY, + GTT_TYPE_INVALID, + GTT_TYPE_INVALID), + GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PTE_2M_ENTRY, + GTT_TYPE_PPGTT_PDE_ENTRY, + GTT_TYPE_INVALID, + GTT_TYPE_PPGTT_PTE_2M_ENTRY), + GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PTE_1G_ENTRY, + GTT_TYPE_PPGTT_PDP_ENTRY, + GTT_TYPE_INVALID, + GTT_TYPE_PPGTT_PTE_1G_ENTRY), + GTT_TYPE_TABLE_ENTRY(GTT_TYPE_GGTT_PTE, + GTT_TYPE_GGTT_PTE, + GTT_TYPE_INVALID, + GTT_TYPE_INVALID), +}; + +static inline int get_next_pt_type(int type) +{ + return gtt_type_table[type].next_pt_type; +} + +static inline int get_entry_type(int type) +{ + return gtt_type_table[type].entry_type; +} + +static inline int get_pse_type(int type) +{ + return gtt_type_table[type].pse_entry_type; +} + +static u64 read_pte64(struct drm_i915_private *dev_priv, unsigned long index) +{ + void __iomem *addr = (gen8_pte_t __iomem *)dev_priv->ggtt.gsm + index; + u64 pte; + +#ifdef readq + pte = readq(addr); +#else + pte = ioread32(addr); + pte |= ioread32(addr + 4) << 32; +#endif + return pte; +} + +static void write_pte64(struct drm_i915_private *dev_priv, + unsigned long index, u64 pte) +{ + void __iomem *addr = (gen8_pte_t __iomem *)dev_priv->ggtt.gsm + index; + +#ifdef writeq + writeq(pte, addr); +#else + iowrite32((u32)pte, addr); + iowrite32(pte >> 32, addr + 4); +#endif + I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN); + POSTING_READ(GFX_FLSH_CNTL_GEN6); +} + +static inline struct intel_gvt_gtt_entry *gtt_get_entry64(void *pt, + struct intel_gvt_gtt_entry *e, + unsigned long index, bool hypervisor_access, unsigned long gpa, + struct intel_vgpu *vgpu) +{ + const struct intel_gvt_device_info *info = &vgpu->gvt->device_info; + int ret; + + if (WARN_ON(info->gtt_entry_size != 8)) + return e; + + if (hypervisor_access) { + ret = intel_gvt_hypervisor_read_gpa(vgpu, gpa + + (index << info->gtt_entry_size_shift), + &e->val64, 8); + WARN_ON(ret); + } else if (!pt) { + e->val64 = read_pte64(vgpu->gvt->dev_priv, index); + } else { + e->val64 = *((u64 *)pt + index); + } + return e; +} + +static inline struct intel_gvt_gtt_entry *gtt_set_entry64(void *pt, + struct intel_gvt_gtt_entry *e, + unsigned long index, bool hypervisor_access, unsigned long gpa, + struct intel_vgpu *vgpu) +{ + const struct intel_gvt_device_info *info = &vgpu->gvt->device_info; + int ret; + + if (WARN_ON(info->gtt_entry_size != 8)) + return e; + + if (hypervisor_access) { + ret = intel_gvt_hypervisor_write_gpa(vgpu, gpa + + (index << info->gtt_entry_size_shift), + &e->val64, 8); + WARN_ON(ret); + } else if (!pt) { + write_pte64(vgpu->gvt->dev_priv, index, e->val64); + } else { + *((u64 *)pt + index) = e->val64; + } + return e; +} + +#define GTT_HAW 46 + +#define ADDR_1G_MASK (((1UL << (GTT_HAW - 30 + 1)) - 1) << 30) +#define ADDR_2M_MASK (((1UL << (GTT_HAW - 21 + 1)) - 1) << 21) +#define ADDR_4K_MASK (((1UL << (GTT_HAW - 12 + 1)) - 1) << 12) + +static unsigned long gen8_gtt_get_pfn(struct intel_gvt_gtt_entry *e) +{ + unsigned long pfn; + + if (e->type == GTT_TYPE_PPGTT_PTE_1G_ENTRY) + pfn = (e->val64 & ADDR_1G_MASK) >> 12; + else if (e->type == GTT_TYPE_PPGTT_PTE_2M_ENTRY) + pfn = (e->val64 & ADDR_2M_MASK) >> 12; + else + pfn = (e->val64 & ADDR_4K_MASK) >> 12; + return pfn; +} + +static void gen8_gtt_set_pfn(struct intel_gvt_gtt_entry *e, unsigned long pfn) +{ + if (e->type == GTT_TYPE_PPGTT_PTE_1G_ENTRY) { + e->val64 &= ~ADDR_1G_MASK; + pfn &= (ADDR_1G_MASK >> 12); + } else if (e->type == GTT_TYPE_PPGTT_PTE_2M_ENTRY) { + e->val64 &= ~ADDR_2M_MASK; + pfn &= (ADDR_2M_MASK >> 12); + } else { + e->val64 &= ~ADDR_4K_MASK; + pfn &= (ADDR_4K_MASK >> 12); + } + + e->val64 |= (pfn << 12); +} + +static bool gen8_gtt_test_pse(struct intel_gvt_gtt_entry *e) +{ + /* Entry doesn't have PSE bit. */ + if (get_pse_type(e->type) == GTT_TYPE_INVALID) + return false; + + e->type = get_entry_type(e->type); + if (!(e->val64 & (1 << 7))) + return false; + + e->type = get_pse_type(e->type); + return true; +} + +static bool gen8_gtt_test_present(struct intel_gvt_gtt_entry *e) +{ + /* + * i915 writes PDP root pointer registers without present bit, + * it also works, so we need to treat root pointer entry + * specifically. + */ + if (e->type == GTT_TYPE_PPGTT_ROOT_L3_ENTRY + || e->type == GTT_TYPE_PPGTT_ROOT_L4_ENTRY) + return (e->val64 != 0); + else + return (e->val64 & (1 << 0)); +} + +static void gtt_entry_clear_present(struct intel_gvt_gtt_entry *e) +{ + e->val64 &= ~(1 << 0); +} + +/* + * Per-platform GMA routines. + */ +static unsigned long gma_to_ggtt_pte_index(unsigned long gma) +{ + unsigned long x = (gma >> GTT_PAGE_SHIFT); + + trace_gma_index(__func__, gma, x); + return x; +} + +#define DEFINE_PPGTT_GMA_TO_INDEX(prefix, ename, exp) \ +static unsigned long prefix##_gma_to_##ename##_index(unsigned long gma) \ +{ \ + unsigned long x = (exp); \ + trace_gma_index(__func__, gma, x); \ + return x; \ +} + +DEFINE_PPGTT_GMA_TO_INDEX(gen8, pte, (gma >> 12 & 0x1ff)); +DEFINE_PPGTT_GMA_TO_INDEX(gen8, pde, (gma >> 21 & 0x1ff)); +DEFINE_PPGTT_GMA_TO_INDEX(gen8, l3_pdp, (gma >> 30 & 0x3)); +DEFINE_PPGTT_GMA_TO_INDEX(gen8, l4_pdp, (gma >> 30 & 0x1ff)); +DEFINE_PPGTT_GMA_TO_INDEX(gen8, pml4, (gma >> 39 & 0x1ff)); + +static struct intel_gvt_gtt_pte_ops gen8_gtt_pte_ops = { + .get_entry = gtt_get_entry64, + .set_entry = gtt_set_entry64, + .clear_present = gtt_entry_clear_present, + .test_present = gen8_gtt_test_present, + .test_pse = gen8_gtt_test_pse, + .get_pfn = gen8_gtt_get_pfn, + .set_pfn = gen8_gtt_set_pfn, +}; + +static struct intel_gvt_gtt_gma_ops gen8_gtt_gma_ops = { + .gma_to_ggtt_pte_index = gma_to_ggtt_pte_index, + .gma_to_pte_index = gen8_gma_to_pte_index, + .gma_to_pde_index = gen8_gma_to_pde_index, + .gma_to_l3_pdp_index = gen8_gma_to_l3_pdp_index, + .gma_to_l4_pdp_index = gen8_gma_to_l4_pdp_index, + .gma_to_pml4_index = gen8_gma_to_pml4_index, +}; + +static int gtt_entry_p2m(struct intel_vgpu *vgpu, struct intel_gvt_gtt_entry *p, + struct intel_gvt_gtt_entry *m) +{ + struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops; + unsigned long gfn, mfn; + + *m = *p; + + if (!ops->test_present(p)) + return 0; + + gfn = ops->get_pfn(p); + + mfn = intel_gvt_hypervisor_gfn_to_mfn(vgpu, gfn); + if (mfn == INTEL_GVT_INVALID_ADDR) { + gvt_err("fail to translate gfn: 0x%lx\n", gfn); + return -ENXIO; + } + + ops->set_pfn(m, mfn); + return 0; +} + +/* + * MM helpers. + */ +struct intel_gvt_gtt_entry *intel_vgpu_mm_get_entry(struct intel_vgpu_mm *mm, + void *page_table, struct intel_gvt_gtt_entry *e, + unsigned long index) +{ + struct intel_gvt *gvt = mm->vgpu->gvt; + struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops; + + e->type = mm->page_table_entry_type; + + ops->get_entry(page_table, e, index, false, 0, mm->vgpu); + ops->test_pse(e); + return e; +} + +struct intel_gvt_gtt_entry *intel_vgpu_mm_set_entry(struct intel_vgpu_mm *mm, + void *page_table, struct intel_gvt_gtt_entry *e, + unsigned long index) +{ + struct intel_gvt *gvt = mm->vgpu->gvt; + struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops; + + return ops->set_entry(page_table, e, index, false, 0, mm->vgpu); +} + +/* + * PPGTT shadow page table helpers. + */ +static inline struct intel_gvt_gtt_entry *ppgtt_spt_get_entry( + struct intel_vgpu_ppgtt_spt *spt, + void *page_table, int type, + struct intel_gvt_gtt_entry *e, unsigned long index, + bool guest) +{ + struct intel_gvt *gvt = spt->vgpu->gvt; + struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops; + + e->type = get_entry_type(type); + + if (WARN(!gtt_type_is_entry(e->type), "invalid entry type\n")) + return e; + + ops->get_entry(page_table, e, index, guest, + spt->guest_page.gfn << GTT_PAGE_SHIFT, + spt->vgpu); + ops->test_pse(e); + return e; +} + +static inline struct intel_gvt_gtt_entry *ppgtt_spt_set_entry( + struct intel_vgpu_ppgtt_spt *spt, + void *page_table, int type, + struct intel_gvt_gtt_entry *e, unsigned long index, + bool guest) +{ + struct intel_gvt *gvt = spt->vgpu->gvt; + struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops; + + if (WARN(!gtt_type_is_entry(e->type), "invalid entry type\n")) + return e; + + return ops->set_entry(page_table, e, index, guest, + spt->guest_page.gfn << GTT_PAGE_SHIFT, + spt->vgpu); +} + +#define ppgtt_get_guest_entry(spt, e, index) \ + ppgtt_spt_get_entry(spt, NULL, \ + spt->guest_page_type, e, index, true) + +#define ppgtt_set_guest_entry(spt, e, index) \ + ppgtt_spt_set_entry(spt, NULL, \ + spt->guest_page_type, e, index, true) + +#define ppgtt_get_shadow_entry(spt, e, index) \ + ppgtt_spt_get_entry(spt, spt->shadow_page.vaddr, \ + spt->shadow_page.type, e, index, false) + +#define ppgtt_set_shadow_entry(spt, e, index) \ + ppgtt_spt_set_entry(spt, spt->shadow_page.vaddr, \ + spt->shadow_page.type, e, index, false) + +/** + * intel_vgpu_init_guest_page - init a guest page data structure + * @vgpu: a vGPU + * @p: a guest page data structure + * @gfn: guest memory page frame number + * @handler: function will be called when target guest memory page has + * been modified. + * + * This function is called when user wants to track a guest memory page. + * + * Returns: + * Zero on success, negative error code if failed. + */ +int intel_vgpu_init_guest_page(struct intel_vgpu *vgpu, + struct intel_vgpu_guest_page *p, + unsigned long gfn, + int (*handler)(void *, u64, void *, int), + void *data) +{ + INIT_HLIST_NODE(&p->node); + + p->writeprotection = false; + p->gfn = gfn; + p->handler = handler; + p->data = data; + p->oos_page = NULL; + p->write_cnt = 0; + + hash_add(vgpu->gtt.guest_page_hash_table, &p->node, p->gfn); + return 0; +} + +static int detach_oos_page(struct intel_vgpu *vgpu, + struct intel_vgpu_oos_page *oos_page); + +/** + * intel_vgpu_clean_guest_page - release the resource owned by guest page data + * structure + * @vgpu: a vGPU + * @p: a tracked guest page + * + * This function is called when user tries to stop tracking a guest memory + * page. + */ +void intel_vgpu_clean_guest_page(struct intel_vgpu *vgpu, + struct intel_vgpu_guest_page *p) +{ + if (!hlist_unhashed(&p->node)) + hash_del(&p->node); + + if (p->oos_page) + detach_oos_page(vgpu, p->oos_page); + + if (p->writeprotection) + intel_gvt_hypervisor_unset_wp_page(vgpu, p); +} + +/** + * intel_vgpu_find_guest_page - find a guest page data structure by GFN. + * @vgpu: a vGPU + * @gfn: guest memory page frame number + * + * This function is called when emulation logic wants to know if a trapped GFN + * is a tracked guest page. + * + * Returns: + * Pointer to guest page data structure, NULL if failed. + */ +struct intel_vgpu_guest_page *intel_vgpu_find_guest_page( + struct intel_vgpu *vgpu, unsigned long gfn) +{ + struct intel_vgpu_guest_page *p; + + hash_for_each_possible(vgpu->gtt.guest_page_hash_table, + p, node, gfn) { + if (p->gfn == gfn) + return p; + } + return NULL; +} + +static inline int init_shadow_page(struct intel_vgpu *vgpu, + struct intel_vgpu_shadow_page *p, int type) +{ + p->vaddr = page_address(p->page); + p->type = type; + + INIT_HLIST_NODE(&p->node); + + p->mfn = intel_gvt_hypervisor_virt_to_mfn(p->vaddr); + if (p->mfn == INTEL_GVT_INVALID_ADDR) + return -EFAULT; + + hash_add(vgpu->gtt.shadow_page_hash_table, &p->node, p->mfn); + return 0; +} + +static inline void clean_shadow_page(struct intel_vgpu_shadow_page *p) +{ + if (!hlist_unhashed(&p->node)) + hash_del(&p->node); +} + +static inline struct intel_vgpu_shadow_page *find_shadow_page( + struct intel_vgpu *vgpu, unsigned long mfn) +{ + struct intel_vgpu_shadow_page *p; + + hash_for_each_possible(vgpu->gtt.shadow_page_hash_table, + p, node, mfn) { + if (p->mfn == mfn) + return p; + } + return NULL; +} + +#define guest_page_to_ppgtt_spt(ptr) \ + container_of(ptr, struct intel_vgpu_ppgtt_spt, guest_page) + +#define shadow_page_to_ppgtt_spt(ptr) \ + container_of(ptr, struct intel_vgpu_ppgtt_spt, shadow_page) + +static void *alloc_spt(gfp_t gfp_mask) +{ + struct intel_vgpu_ppgtt_spt *spt; + + spt = kzalloc(sizeof(*spt), gfp_mask); + if (!spt) + return NULL; + + spt->shadow_page.page = alloc_page(gfp_mask); + if (!spt->shadow_page.page) { + kfree(spt); + return NULL; + } + return spt; +} + +static void free_spt(struct intel_vgpu_ppgtt_spt *spt) +{ + __free_page(spt->shadow_page.page); + kfree(spt); +} + +static void ppgtt_free_shadow_page(struct intel_vgpu_ppgtt_spt *spt) +{ + trace_spt_free(spt->vgpu->id, spt, spt->shadow_page.type); + + clean_shadow_page(&spt->shadow_page); + intel_vgpu_clean_guest_page(spt->vgpu, &spt->guest_page); + list_del_init(&spt->post_shadow_list); + + free_spt(spt); +} + +static void ppgtt_free_all_shadow_page(struct intel_vgpu *vgpu) +{ + struct hlist_node *n; + struct intel_vgpu_shadow_page *sp; + int i; + + hash_for_each_safe(vgpu->gtt.shadow_page_hash_table, i, n, sp, node) + ppgtt_free_shadow_page(shadow_page_to_ppgtt_spt(sp)); +} + +static int ppgtt_handle_guest_write_page_table_bytes(void *gp, + u64 pa, void *p_data, int bytes); + +static int ppgtt_write_protection_handler(void *gp, u64 pa, + void *p_data, int bytes) +{ + struct intel_vgpu_guest_page *gpt = (struct intel_vgpu_guest_page *)gp; + int ret; + + if (bytes != 4 && bytes != 8) + return -EINVAL; + + if (!gpt->writeprotection) + return -EINVAL; + + ret = ppgtt_handle_guest_write_page_table_bytes(gp, + pa, p_data, bytes); + if (ret) + return ret; + return ret; +} + +static int reclaim_one_mm(struct intel_gvt *gvt); + +static struct intel_vgpu_ppgtt_spt *ppgtt_alloc_shadow_page( + struct intel_vgpu *vgpu, int type, unsigned long gfn) +{ + struct intel_vgpu_ppgtt_spt *spt = NULL; + int ret; + +retry: + spt = alloc_spt(GFP_KERNEL | __GFP_ZERO); + if (!spt) { + if (reclaim_one_mm(vgpu->gvt)) + goto retry; + + gvt_err("fail to allocate ppgtt shadow page\n"); + return ERR_PTR(-ENOMEM); + } + + spt->vgpu = vgpu; + spt->guest_page_type = type; + atomic_set(&spt->refcount, 1); + INIT_LIST_HEAD(&spt->post_shadow_list); + + /* + * TODO: guest page type may be different with shadow page type, + * when we support PSE page in future. + */ + ret = init_shadow_page(vgpu, &spt->shadow_page, type); + if (ret) { + gvt_err("fail to initialize shadow page for spt\n"); + goto err; + } + + ret = intel_vgpu_init_guest_page(vgpu, &spt->guest_page, + gfn, ppgtt_write_protection_handler, NULL); + if (ret) { + gvt_err("fail to initialize guest page for spt\n"); + goto err; + } + + trace_spt_alloc(vgpu->id, spt, type, spt->shadow_page.mfn, gfn); + return spt; +err: + ppgtt_free_shadow_page(spt); + return ERR_PTR(ret); +} + +static struct intel_vgpu_ppgtt_spt *ppgtt_find_shadow_page( + struct intel_vgpu *vgpu, unsigned long mfn) +{ + struct intel_vgpu_shadow_page *p = find_shadow_page(vgpu, mfn); + + if (p) + return shadow_page_to_ppgtt_spt(p); + + gvt_err("vgpu%d: fail to find ppgtt shadow page: 0x%lx\n", + vgpu->id, mfn); + return NULL; +} + +#define pt_entry_size_shift(spt) \ + ((spt)->vgpu->gvt->device_info.gtt_entry_size_shift) + +#define pt_entries(spt) \ + (GTT_PAGE_SIZE >> pt_entry_size_shift(spt)) + +#define for_each_present_guest_entry(spt, e, i) \ + for (i = 0; i < pt_entries(spt); i++) \ + if (spt->vgpu->gvt->gtt.pte_ops->test_present( \ + ppgtt_get_guest_entry(spt, e, i))) + +#define for_each_present_shadow_entry(spt, e, i) \ + for (i = 0; i < pt_entries(spt); i++) \ + if (spt->vgpu->gvt->gtt.pte_ops->test_present( \ + ppgtt_get_shadow_entry(spt, e, i))) + +static void ppgtt_get_shadow_page(struct intel_vgpu_ppgtt_spt *spt) +{ + int v = atomic_read(&spt->refcount); + + trace_spt_refcount(spt->vgpu->id, "inc", spt, v, (v + 1)); + + atomic_inc(&spt->refcount); +} + +static int ppgtt_invalidate_shadow_page(struct intel_vgpu_ppgtt_spt *spt); + +static int ppgtt_invalidate_shadow_page_by_shadow_entry(struct intel_vgpu *vgpu, + struct intel_gvt_gtt_entry *e) +{ + struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops; + struct intel_vgpu_ppgtt_spt *s; + + if (WARN_ON(!gtt_type_is_pt(get_next_pt_type(e->type)))) + return -EINVAL; + + if (ops->get_pfn(e) == vgpu->gtt.scratch_page_mfn) + return 0; + + s = ppgtt_find_shadow_page(vgpu, ops->get_pfn(e)); + if (!s) { + gvt_err("vgpu%d: fail to find shadow page: mfn: 0x%lx\n", + vgpu->id, ops->get_pfn(e)); + return -ENXIO; + } + return ppgtt_invalidate_shadow_page(s); +} + +static int ppgtt_invalidate_shadow_page(struct intel_vgpu_ppgtt_spt *spt) +{ + struct intel_gvt_gtt_entry e; + unsigned long index; + int ret; + int v = atomic_read(&spt->refcount); + + trace_spt_change(spt->vgpu->id, "die", spt, + spt->guest_page.gfn, spt->shadow_page.type); + + trace_spt_refcount(spt->vgpu->id, "dec", spt, v, (v - 1)); + + if (atomic_dec_return(&spt->refcount) > 0) + return 0; + + if (gtt_type_is_pte_pt(spt->shadow_page.type)) + goto release; + + for_each_present_shadow_entry(spt, &e, index) { + if (!gtt_type_is_pt(get_next_pt_type(e.type))) { + gvt_err("GVT doesn't support pse bit for now\n"); + return -EINVAL; + } + ret = ppgtt_invalidate_shadow_page_by_shadow_entry( + spt->vgpu, &e); + if (ret) + goto fail; + } +release: + trace_spt_change(spt->vgpu->id, "release", spt, + spt->guest_page.gfn, spt->shadow_page.type); + ppgtt_free_shadow_page(spt); + return 0; +fail: + gvt_err("vgpu%d: fail: shadow page %p shadow entry 0x%llx type %d\n", + spt->vgpu->id, spt, e.val64, e.type); + return ret; +} + +static int ppgtt_populate_shadow_page(struct intel_vgpu_ppgtt_spt *spt); + +static struct intel_vgpu_ppgtt_spt *ppgtt_populate_shadow_page_by_guest_entry( + struct intel_vgpu *vgpu, struct intel_gvt_gtt_entry *we) +{ + struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops; + struct intel_vgpu_ppgtt_spt *s = NULL; + struct intel_vgpu_guest_page *g; + int ret; + + if (WARN_ON(!gtt_type_is_pt(get_next_pt_type(we->type)))) { + ret = -EINVAL; + goto fail; + } + + g = intel_vgpu_find_guest_page(vgpu, ops->get_pfn(we)); + if (g) { + s = guest_page_to_ppgtt_spt(g); + ppgtt_get_shadow_page(s); + } else { + int type = get_next_pt_type(we->type); + + s = ppgtt_alloc_shadow_page(vgpu, type, ops->get_pfn(we)); + if (IS_ERR(s)) { + ret = PTR_ERR(s); + goto fail; + } + + ret = intel_gvt_hypervisor_set_wp_page(vgpu, &s->guest_page); + if (ret) + goto fail; + + ret = ppgtt_populate_shadow_page(s); + if (ret) + goto fail; + + trace_spt_change(vgpu->id, "new", s, s->guest_page.gfn, + s->shadow_page.type); + } + return s; +fail: + gvt_err("vgpu%d: fail: shadow page %p guest entry 0x%llx type %d\n", + vgpu->id, s, we->val64, we->type); + return ERR_PTR(ret); +} + +static inline void ppgtt_generate_shadow_entry(struct intel_gvt_gtt_entry *se, + struct intel_vgpu_ppgtt_spt *s, struct intel_gvt_gtt_entry *ge) +{ + struct intel_gvt_gtt_pte_ops *ops = s->vgpu->gvt->gtt.pte_ops; + + se->type = ge->type; + se->val64 = ge->val64; + + ops->set_pfn(se, s->shadow_page.mfn); +} + +static int ppgtt_populate_shadow_page(struct intel_vgpu_ppgtt_spt *spt) +{ + struct intel_vgpu *vgpu = spt->vgpu; + struct intel_vgpu_ppgtt_spt *s; + struct intel_gvt_gtt_entry se, ge; + unsigned long i; + int ret; + + trace_spt_change(spt->vgpu->id, "born", spt, + spt->guest_page.gfn, spt->shadow_page.type); + + if (gtt_type_is_pte_pt(spt->shadow_page.type)) { + for_each_present_guest_entry(spt, &ge, i) { + ret = gtt_entry_p2m(vgpu, &ge, &se); + if (ret) + goto fail; + ppgtt_set_shadow_entry(spt, &se, i); + } + return 0; + } + + for_each_present_guest_entry(spt, &ge, i) { + if (!gtt_type_is_pt(get_next_pt_type(ge.type))) { + gvt_err("GVT doesn't support pse bit now\n"); + ret = -EINVAL; + goto fail; + } + + s = ppgtt_populate_shadow_page_by_guest_entry(vgpu, &ge); + if (IS_ERR(s)) { + ret = PTR_ERR(s); + goto fail; + } + ppgtt_get_shadow_entry(spt, &se, i); + ppgtt_generate_shadow_entry(&se, s, &ge); + ppgtt_set_shadow_entry(spt, &se, i); + } + return 0; +fail: + gvt_err("vgpu%d: fail: shadow page %p guest entry 0x%llx type %d\n", + vgpu->id, spt, ge.val64, ge.type); + return ret; +} + +static int ppgtt_handle_guest_entry_removal(struct intel_vgpu_guest_page *gpt, + struct intel_gvt_gtt_entry *we, unsigned long index) +{ + struct intel_vgpu_ppgtt_spt *spt = guest_page_to_ppgtt_spt(gpt); + struct intel_vgpu_shadow_page *sp = &spt->shadow_page; + struct intel_vgpu *vgpu = spt->vgpu; + struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops; + struct intel_gvt_gtt_entry e; + int ret; + + trace_gpt_change(spt->vgpu->id, "remove", spt, sp->type, + we->val64, index); + + ppgtt_get_shadow_entry(spt, &e, index); + if (!ops->test_present(&e)) + return 0; + + if (ops->get_pfn(&e) == vgpu->gtt.scratch_page_mfn) + return 0; + + if (gtt_type_is_pt(get_next_pt_type(we->type))) { + struct intel_vgpu_guest_page *g = + intel_vgpu_find_guest_page(vgpu, ops->get_pfn(we)); + if (!g) { + gvt_err("fail to find guest page\n"); + ret = -ENXIO; + goto fail; + } + ret = ppgtt_invalidate_shadow_page(guest_page_to_ppgtt_spt(g)); + if (ret) + goto fail; + } + ops->set_pfn(&e, vgpu->gtt.scratch_page_mfn); + ppgtt_set_shadow_entry(spt, &e, index); + return 0; +fail: + gvt_err("vgpu%d: fail: shadow page %p guest entry 0x%llx type %d\n", + vgpu->id, spt, we->val64, we->type); + return ret; +} + +static int ppgtt_handle_guest_entry_add(struct intel_vgpu_guest_page *gpt, + struct intel_gvt_gtt_entry *we, unsigned long index) +{ + struct intel_vgpu_ppgtt_spt *spt = guest_page_to_ppgtt_spt(gpt); + struct intel_vgpu_shadow_page *sp = &spt->shadow_page; + struct intel_vgpu *vgpu = spt->vgpu; + struct intel_gvt_gtt_entry m; + struct intel_vgpu_ppgtt_spt *s; + int ret; + + trace_gpt_change(spt->vgpu->id, "add", spt, sp->type, + we->val64, index); + + if (gtt_type_is_pt(get_next_pt_type(we->type))) { + s = ppgtt_populate_shadow_page_by_guest_entry(vgpu, we); + if (IS_ERR(s)) { + ret = PTR_ERR(s); + goto fail; + } + ppgtt_get_shadow_entry(spt, &m, index); + ppgtt_generate_shadow_entry(&m, s, we); + ppgtt_set_shadow_entry(spt, &m, index); + } else { + ret = gtt_entry_p2m(vgpu, we, &m); + if (ret) + goto fail; + ppgtt_set_shadow_entry(spt, &m, index); + } + return 0; +fail: + gvt_err("vgpu%d: fail: spt %p guest entry 0x%llx type %d\n", vgpu->id, + spt, we->val64, we->type); + return ret; +} + +static int sync_oos_page(struct intel_vgpu *vgpu, + struct intel_vgpu_oos_page *oos_page) +{ + const struct intel_gvt_device_info *info = &vgpu->gvt->device_info; + struct intel_gvt *gvt = vgpu->gvt; + struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops; + struct intel_vgpu_ppgtt_spt *spt = + guest_page_to_ppgtt_spt(oos_page->guest_page); + struct intel_gvt_gtt_entry old, new, m; + int index; + int ret; + + trace_oos_change(vgpu->id, "sync", oos_page->id, + oos_page->guest_page, spt->guest_page_type); + + old.type = new.type = get_entry_type(spt->guest_page_type); + old.val64 = new.val64 = 0; + + for (index = 0; index < (GTT_PAGE_SIZE >> info->gtt_entry_size_shift); + index++) { + ops->get_entry(oos_page->mem, &old, index, false, 0, vgpu); + ops->get_entry(NULL, &new, index, true, + oos_page->guest_page->gfn << PAGE_SHIFT, vgpu); + + if (old.val64 == new.val64 + && !test_and_clear_bit(index, spt->post_shadow_bitmap)) + continue; + + trace_oos_sync(vgpu->id, oos_page->id, + oos_page->guest_page, spt->guest_page_type, + new.val64, index); + + ret = gtt_entry_p2m(vgpu, &new, &m); + if (ret) + return ret; + + ops->set_entry(oos_page->mem, &new, index, false, 0, vgpu); + ppgtt_set_shadow_entry(spt, &m, index); + } + + oos_page->guest_page->write_cnt = 0; + list_del_init(&spt->post_shadow_list); + return 0; +} + +static int detach_oos_page(struct intel_vgpu *vgpu, + struct intel_vgpu_oos_page *oos_page) +{ + struct intel_gvt *gvt = vgpu->gvt; + struct intel_vgpu_ppgtt_spt *spt = + guest_page_to_ppgtt_spt(oos_page->guest_page); + + trace_oos_change(vgpu->id, "detach", oos_page->id, + oos_page->guest_page, spt->guest_page_type); + + oos_page->guest_page->write_cnt = 0; + oos_page->guest_page->oos_page = NULL; + oos_page->guest_page = NULL; + + list_del_init(&oos_page->vm_list); + list_move_tail(&oos_page->list, &gvt->gtt.oos_page_free_list_head); + + return 0; +} + +static int attach_oos_page(struct intel_vgpu *vgpu, + struct intel_vgpu_oos_page *oos_page, + struct intel_vgpu_guest_page *gpt) +{ + struct intel_gvt *gvt = vgpu->gvt; + int ret; + + ret = intel_gvt_hypervisor_read_gpa(vgpu, gpt->gfn << GTT_PAGE_SHIFT, + oos_page->mem, GTT_PAGE_SIZE); + if (ret) + return ret; + + oos_page->guest_page = gpt; + gpt->oos_page = oos_page; + + list_move_tail(&oos_page->list, &gvt->gtt.oos_page_use_list_head); + + trace_oos_change(vgpu->id, "attach", gpt->oos_page->id, + gpt, guest_page_to_ppgtt_spt(gpt)->guest_page_type); + return 0; +} + +static int ppgtt_set_guest_page_sync(struct intel_vgpu *vgpu, + struct intel_vgpu_guest_page *gpt) +{ + int ret; + + ret = intel_gvt_hypervisor_set_wp_page(vgpu, gpt); + if (ret) + return ret; + + trace_oos_change(vgpu->id, "set page sync", gpt->oos_page->id, + gpt, guest_page_to_ppgtt_spt(gpt)->guest_page_type); + + list_del_init(&gpt->oos_page->vm_list); + return sync_oos_page(vgpu, gpt->oos_page); +} + +static int ppgtt_allocate_oos_page(struct intel_vgpu *vgpu, + struct intel_vgpu_guest_page *gpt) +{ + struct intel_gvt *gvt = vgpu->gvt; + struct intel_gvt_gtt *gtt = &gvt->gtt; + struct intel_vgpu_oos_page *oos_page = gpt->oos_page; + int ret; + + WARN(oos_page, "shadow PPGTT page has already has a oos page\n"); + + if (list_empty(>t->oos_page_free_list_head)) { + oos_page = container_of(gtt->oos_page_use_list_head.next, + struct intel_vgpu_oos_page, list); + ret = ppgtt_set_guest_page_sync(vgpu, oos_page->guest_page); + if (ret) + return ret; + ret = detach_oos_page(vgpu, oos_page); + if (ret) + return ret; + } else + oos_page = container_of(gtt->oos_page_free_list_head.next, + struct intel_vgpu_oos_page, list); + return attach_oos_page(vgpu, oos_page, gpt); +} + +static int ppgtt_set_guest_page_oos(struct intel_vgpu *vgpu, + struct intel_vgpu_guest_page *gpt) +{ + struct intel_vgpu_oos_page *oos_page = gpt->oos_page; + + if (WARN(!oos_page, "shadow PPGTT page should have a oos page\n")) + return -EINVAL; + + trace_oos_change(vgpu->id, "set page out of sync", gpt->oos_page->id, + gpt, guest_page_to_ppgtt_spt(gpt)->guest_page_type); + + list_add_tail(&oos_page->vm_list, &vgpu->gtt.oos_page_list_head); + return intel_gvt_hypervisor_unset_wp_page(vgpu, gpt); +} + +/** + * intel_vgpu_sync_oos_pages - sync all the out-of-synced shadow for vGPU + * @vgpu: a vGPU + * + * This function is called before submitting a guest workload to host, + * to sync all the out-of-synced shadow for vGPU + * + * Returns: + * Zero on success, negative error code if failed. + */ +int intel_vgpu_sync_oos_pages(struct intel_vgpu *vgpu) +{ + struct list_head *pos, *n; + struct intel_vgpu_oos_page *oos_page; + int ret; + + if (!enable_out_of_sync) + return 0; + + list_for_each_safe(pos, n, &vgpu->gtt.oos_page_list_head) { + oos_page = container_of(pos, + struct intel_vgpu_oos_page, vm_list); + ret = ppgtt_set_guest_page_sync(vgpu, oos_page->guest_page); + if (ret) + return ret; + } + return 0; +} + +/* + * The heart of PPGTT shadow page table. + */ +static int ppgtt_handle_guest_write_page_table( + struct intel_vgpu_guest_page *gpt, + struct intel_gvt_gtt_entry *we, unsigned long index) +{ + struct intel_vgpu_ppgtt_spt *spt = guest_page_to_ppgtt_spt(gpt); + struct intel_vgpu *vgpu = spt->vgpu; + struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops; + struct intel_gvt_gtt_entry ge; + + int old_present, new_present; + int ret; + + ppgtt_get_guest_entry(spt, &ge, index); + + old_present = ops->test_present(&ge); + new_present = ops->test_present(we); + + ppgtt_set_guest_entry(spt, we, index); + + if (old_present) { + ret = ppgtt_handle_guest_entry_removal(gpt, &ge, index); + if (ret) + goto fail; + } + if (new_present) { + ret = ppgtt_handle_guest_entry_add(gpt, we, index); + if (ret) + goto fail; + } + return 0; +fail: + gvt_err("vgpu%d: fail: shadow page %p guest entry 0x%llx type %d.\n", + vgpu->id, spt, we->val64, we->type); + return ret; +} + +static inline bool can_do_out_of_sync(struct intel_vgpu_guest_page *gpt) +{ + return enable_out_of_sync + && gtt_type_is_pte_pt( + guest_page_to_ppgtt_spt(gpt)->guest_page_type) + && gpt->write_cnt >= 2; +} + +static void ppgtt_set_post_shadow(struct intel_vgpu_ppgtt_spt *spt, + unsigned long index) +{ + set_bit(index, spt->post_shadow_bitmap); + if (!list_empty(&spt->post_shadow_list)) + return; + + list_add_tail(&spt->post_shadow_list, + &spt->vgpu->gtt.post_shadow_list_head); +} + +/** + * intel_vgpu_flush_post_shadow - flush the post shadow transactions + * @vgpu: a vGPU + * + * This function is called before submitting a guest workload to host, + * to flush all the post shadows for a vGPU. + * + * Returns: + * Zero on success, negative error code if failed. + */ +int intel_vgpu_flush_post_shadow(struct intel_vgpu *vgpu) +{ + struct list_head *pos, *n; + struct intel_vgpu_ppgtt_spt *spt; + struct intel_gvt_gtt_entry ge, e; + unsigned long index; + int ret; + + list_for_each_safe(pos, n, &vgpu->gtt.post_shadow_list_head) { + spt = container_of(pos, struct intel_vgpu_ppgtt_spt, + post_shadow_list); + + for_each_set_bit(index, spt->post_shadow_bitmap, + GTT_ENTRY_NUM_IN_ONE_PAGE) { + ppgtt_get_guest_entry(spt, &ge, index); + e = ge; + e.val64 = 0; + ppgtt_set_guest_entry(spt, &e, index); + + ret = ppgtt_handle_guest_write_page_table( + &spt->guest_page, &ge, index); + if (ret) + return ret; + clear_bit(index, spt->post_shadow_bitmap); + } + list_del_init(&spt->post_shadow_list); + } + return 0; +} + +static int ppgtt_handle_guest_write_page_table_bytes(void *gp, + u64 pa, void *p_data, int bytes) +{ + struct intel_vgpu_guest_page *gpt = (struct intel_vgpu_guest_page *)gp; + struct intel_vgpu_ppgtt_spt *spt = guest_page_to_ppgtt_spt(gpt); + struct intel_vgpu *vgpu = spt->vgpu; + struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops; + const struct intel_gvt_device_info *info = &vgpu->gvt->device_info; + struct intel_gvt_gtt_entry we; + unsigned long index; + int ret; + + index = (pa & (PAGE_SIZE - 1)) >> info->gtt_entry_size_shift; + + ppgtt_get_guest_entry(spt, &we, index); + memcpy((void *)&we.val64 + (pa & (info->gtt_entry_size - 1)), + p_data, bytes); + + ops->test_pse(&we); + + if (bytes == info->gtt_entry_size) { + ret = ppgtt_handle_guest_write_page_table(gpt, &we, index); + if (ret) + return ret; + } else { + struct intel_gvt_gtt_entry ge; + + ppgtt_get_guest_entry(spt, &ge, index); + + if (!test_bit(index, spt->post_shadow_bitmap)) { + ret = ppgtt_handle_guest_entry_removal(gpt, + &ge, index); + if (ret) + return ret; + } + + ppgtt_set_post_shadow(spt, index); + ppgtt_set_guest_entry(spt, &we, index); + } + + if (!enable_out_of_sync) + return 0; + + gpt->write_cnt++; + + if (gpt->oos_page) + ops->set_entry(gpt->oos_page->mem, &we, index, + false, 0, vgpu); + + if (can_do_out_of_sync(gpt)) { + if (!gpt->oos_page) + ppgtt_allocate_oos_page(vgpu, gpt); + + ret = ppgtt_set_guest_page_oos(vgpu, gpt); + if (ret < 0) + return ret; + } + return 0; +} + +/* + * mm page table allocation policy for bdw+ + * - for ggtt, only virtual page table will be allocated. + * - for ppgtt, dedicated virtual/shadow page table will be allocated. + */ +static int gen8_mm_alloc_page_table(struct intel_vgpu_mm *mm) +{ + struct intel_vgpu *vgpu = mm->vgpu; + struct intel_gvt *gvt = vgpu->gvt; + const struct intel_gvt_device_info *info = &gvt->device_info; + void *mem; + + if (mm->type == INTEL_GVT_MM_PPGTT) { + mm->page_table_entry_cnt = 4; + mm->page_table_entry_size = mm->page_table_entry_cnt * + info->gtt_entry_size; + mem = kzalloc(mm->has_shadow_page_table ? + mm->page_table_entry_size * 2 + : mm->page_table_entry_size, + GFP_ATOMIC); + if (!mem) + return -ENOMEM; + mm->virtual_page_table = mem; + if (!mm->has_shadow_page_table) + return 0; + mm->shadow_page_table = mem + mm->page_table_entry_size; + } else if (mm->type == INTEL_GVT_MM_GGTT) { + mm->page_table_entry_cnt = + (gvt_ggtt_gm_sz(gvt) >> GTT_PAGE_SHIFT); + mm->page_table_entry_size = mm->page_table_entry_cnt * + info->gtt_entry_size; + mem = vzalloc(mm->page_table_entry_size); + if (!mem) + return -ENOMEM; + mm->virtual_page_table = mem; + } + return 0; +} + +static void gen8_mm_free_page_table(struct intel_vgpu_mm *mm) +{ + if (mm->type == INTEL_GVT_MM_PPGTT) { + kfree(mm->virtual_page_table); + } else if (mm->type == INTEL_GVT_MM_GGTT) { + if (mm->virtual_page_table) + vfree(mm->virtual_page_table); + } + mm->virtual_page_table = mm->shadow_page_table = NULL; +} + +static void invalidate_mm(struct intel_vgpu_mm *mm) +{ + struct intel_vgpu *vgpu = mm->vgpu; + struct intel_gvt *gvt = vgpu->gvt; + struct intel_gvt_gtt *gtt = &gvt->gtt; + struct intel_gvt_gtt_pte_ops *ops = gtt->pte_ops; + struct intel_gvt_gtt_entry se; + int i; + + if (WARN_ON(!mm->has_shadow_page_table || !mm->shadowed)) + return; + + for (i = 0; i < mm->page_table_entry_cnt; i++) { + ppgtt_get_shadow_root_entry(mm, &se, i); + if (!ops->test_present(&se)) + continue; + ppgtt_invalidate_shadow_page_by_shadow_entry( + vgpu, &se); + se.val64 = 0; + ppgtt_set_shadow_root_entry(mm, &se, i); + + trace_gpt_change(vgpu->id, "destroy root pointer", + NULL, se.type, se.val64, i); + } + mm->shadowed = false; +} + +/** + * intel_vgpu_destroy_mm - destroy a mm object + * @mm: a kref object + * + * This function is used to destroy a mm object for vGPU + * + */ +void intel_vgpu_destroy_mm(struct kref *mm_ref) +{ + struct intel_vgpu_mm *mm = container_of(mm_ref, typeof(*mm), ref); + struct intel_vgpu *vgpu = mm->vgpu; + struct intel_gvt *gvt = vgpu->gvt; + struct intel_gvt_gtt *gtt = &gvt->gtt; + + if (!mm->initialized) + goto out; + + list_del(&mm->list); + list_del(&mm->lru_list); + + if (mm->has_shadow_page_table) + invalidate_mm(mm); + + gtt->mm_free_page_table(mm); +out: + kfree(mm); +} + +static int shadow_mm(struct intel_vgpu_mm *mm) +{ + struct intel_vgpu *vgpu = mm->vgpu; + struct intel_gvt *gvt = vgpu->gvt; + struct intel_gvt_gtt *gtt = &gvt->gtt; + struct intel_gvt_gtt_pte_ops *ops = gtt->pte_ops; + struct intel_vgpu_ppgtt_spt *spt; + struct intel_gvt_gtt_entry ge, se; + int i; + int ret; + + if (WARN_ON(!mm->has_shadow_page_table || mm->shadowed)) + return 0; + + mm->shadowed = true; + + for (i = 0; i < mm->page_table_entry_cnt; i++) { + ppgtt_get_guest_root_entry(mm, &ge, i); + if (!ops->test_present(&ge)) + continue; + + trace_gpt_change(vgpu->id, __func__, NULL, + ge.type, ge.val64, i); + + spt = ppgtt_populate_shadow_page_by_guest_entry(vgpu, &ge); + if (IS_ERR(spt)) { + gvt_err("fail to populate guest root pointer\n"); + ret = PTR_ERR(spt); + goto fail; + } + ppgtt_generate_shadow_entry(&se, spt, &ge); + ppgtt_set_shadow_root_entry(mm, &se, i); + + trace_gpt_change(vgpu->id, "populate root pointer", + NULL, se.type, se.val64, i); + } + return 0; +fail: + invalidate_mm(mm); + return ret; +} + +/** + * intel_vgpu_create_mm - create a mm object for a vGPU + * @vgpu: a vGPU + * @mm_type: mm object type, should be PPGTT or GGTT + * @virtual_page_table: page table root pointers. Could be NULL if user wants + * to populate shadow later. + * @page_table_level: describe the page table level of the mm object + * @pde_base_index: pde root pointer base in GGTT MMIO. + * + * This function is used to create a mm object for a vGPU. + * + * Returns: + * Zero on success, negative error code in pointer if failed. + */ +struct intel_vgpu_mm *intel_vgpu_create_mm(struct intel_vgpu *vgpu, + int mm_type, void *virtual_page_table, int page_table_level, + u32 pde_base_index) +{ + struct intel_gvt *gvt = vgpu->gvt; + struct intel_gvt_gtt *gtt = &gvt->gtt; + struct intel_vgpu_mm *mm; + int ret; + + mm = kzalloc(sizeof(*mm), GFP_ATOMIC); + if (!mm) { + ret = -ENOMEM; + goto fail; + } + + mm->type = mm_type; + + if (page_table_level == 1) + mm->page_table_entry_type = GTT_TYPE_GGTT_PTE; + else if (page_table_level == 3) + mm->page_table_entry_type = GTT_TYPE_PPGTT_ROOT_L3_ENTRY; + else if (page_table_level == 4) + mm->page_table_entry_type = GTT_TYPE_PPGTT_ROOT_L4_ENTRY; + else { + WARN_ON(1); + ret = -EINVAL; + goto fail; + } + + mm->page_table_level = page_table_level; + mm->pde_base_index = pde_base_index; + + mm->vgpu = vgpu; + mm->has_shadow_page_table = !!(mm_type == INTEL_GVT_MM_PPGTT); + + kref_init(&mm->ref); + atomic_set(&mm->pincount, 0); + INIT_LIST_HEAD(&mm->list); + INIT_LIST_HEAD(&mm->lru_list); + list_add_tail(&mm->list, &vgpu->gtt.mm_list_head); + + ret = gtt->mm_alloc_page_table(mm); + if (ret) { + gvt_err("fail to allocate page table for mm\n"); + goto fail; + } + + mm->initialized = true; + + if (virtual_page_table) + memcpy(mm->virtual_page_table, virtual_page_table, + mm->page_table_entry_size); + + if (mm->has_shadow_page_table) { + ret = shadow_mm(mm); + if (ret) + goto fail; + list_add_tail(&mm->lru_list, &gvt->gtt.mm_lru_list_head); + } + return mm; +fail: + gvt_err("fail to create mm\n"); + if (mm) + intel_gvt_mm_unreference(mm); + return ERR_PTR(ret); +} + +/** + * intel_vgpu_unpin_mm - decrease the pin count of a vGPU mm object + * @mm: a vGPU mm object + * + * This function is called when user doesn't want to use a vGPU mm object + */ +void intel_vgpu_unpin_mm(struct intel_vgpu_mm *mm) +{ + if (WARN_ON(mm->type != INTEL_GVT_MM_PPGTT)) + return; + + atomic_dec(&mm->pincount); +} + +/** + * intel_vgpu_pin_mm - increase the pin count of a vGPU mm object + * @vgpu: a vGPU + * + * This function is called when user wants to use a vGPU mm object. If this + * mm object hasn't been shadowed yet, the shadow will be populated at this + * time. + * + * Returns: + * Zero on success, negative error code if failed. + */ +int intel_vgpu_pin_mm(struct intel_vgpu_mm *mm) +{ + int ret; + + if (WARN_ON(mm->type != INTEL_GVT_MM_PPGTT)) + return 0; + + atomic_inc(&mm->pincount); + + if (!mm->shadowed) { + ret = shadow_mm(mm); + if (ret) + return ret; + } + + list_del_init(&mm->lru_list); + list_add_tail(&mm->lru_list, &mm->vgpu->gvt->gtt.mm_lru_list_head); + return 0; +} + +static int reclaim_one_mm(struct intel_gvt *gvt) +{ + struct intel_vgpu_mm *mm; + struct list_head *pos, *n; + + list_for_each_safe(pos, n, &gvt->gtt.mm_lru_list_head) { + mm = container_of(pos, struct intel_vgpu_mm, lru_list); + + if (mm->type != INTEL_GVT_MM_PPGTT) + continue; + if (atomic_read(&mm->pincount)) + continue; + + list_del_init(&mm->lru_list); + invalidate_mm(mm); + return 1; + } + return 0; +} + +/* + * GMA translation APIs. + */ +static inline int ppgtt_get_next_level_entry(struct intel_vgpu_mm *mm, + struct intel_gvt_gtt_entry *e, unsigned long index, bool guest) +{ + struct intel_vgpu *vgpu = mm->vgpu; + struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops; + struct intel_vgpu_ppgtt_spt *s; + + if (WARN_ON(!mm->has_shadow_page_table)) + return -EINVAL; + + s = ppgtt_find_shadow_page(vgpu, ops->get_pfn(e)); + if (!s) + return -ENXIO; + + if (!guest) + ppgtt_get_shadow_entry(s, e, index); + else + ppgtt_get_guest_entry(s, e, index); + return 0; +} + +/** + * intel_vgpu_gma_to_gpa - translate a gma to GPA + * @mm: mm object. could be a PPGTT or GGTT mm object + * @gma: graphics memory address in this mm object + * + * This function is used to translate a graphics memory address in specific + * graphics memory space to guest physical address. + * + * Returns: + * Guest physical address on success, INTEL_GVT_INVALID_ADDR if failed. + */ +unsigned long intel_vgpu_gma_to_gpa(struct intel_vgpu_mm *mm, unsigned long gma) +{ + struct intel_vgpu *vgpu = mm->vgpu; + struct intel_gvt *gvt = vgpu->gvt; + struct intel_gvt_gtt_pte_ops *pte_ops = gvt->gtt.pte_ops; + struct intel_gvt_gtt_gma_ops *gma_ops = gvt->gtt.gma_ops; + unsigned long gpa = INTEL_GVT_INVALID_ADDR; + unsigned long gma_index[4]; + struct intel_gvt_gtt_entry e; + int i, index; + int ret; + + if (mm->type != INTEL_GVT_MM_GGTT && mm->type != INTEL_GVT_MM_PPGTT) + return INTEL_GVT_INVALID_ADDR; + + if (mm->type == INTEL_GVT_MM_GGTT) { + if (!vgpu_gmadr_is_valid(vgpu, gma)) + goto err; + + ggtt_get_guest_entry(mm, &e, + gma_ops->gma_to_ggtt_pte_index(gma)); + gpa = (pte_ops->get_pfn(&e) << GTT_PAGE_SHIFT) + + (gma & ~GTT_PAGE_MASK); + + trace_gma_translate(vgpu->id, "ggtt", 0, 0, gma, gpa); + return gpa; + } + + switch (mm->page_table_level) { + case 4: + ppgtt_get_shadow_root_entry(mm, &e, 0); + gma_index[0] = gma_ops->gma_to_pml4_index(gma); + gma_index[1] = gma_ops->gma_to_l4_pdp_index(gma); + gma_index[2] = gma_ops->gma_to_pde_index(gma); + gma_index[3] = gma_ops->gma_to_pte_index(gma); + index = 4; + break; + case 3: + ppgtt_get_shadow_root_entry(mm, &e, + gma_ops->gma_to_l3_pdp_index(gma)); + gma_index[0] = gma_ops->gma_to_pde_index(gma); + gma_index[1] = gma_ops->gma_to_pte_index(gma); + index = 2; + break; + case 2: + ppgtt_get_shadow_root_entry(mm, &e, + gma_ops->gma_to_pde_index(gma)); + gma_index[0] = gma_ops->gma_to_pte_index(gma); + index = 1; + break; + default: + WARN_ON(1); + goto err; + } + + /* walk into the shadow page table and get gpa from guest entry */ + for (i = 0; i < index; i++) { + ret = ppgtt_get_next_level_entry(mm, &e, gma_index[i], + (i == index - 1)); + if (ret) + goto err; + } + + gpa = (pte_ops->get_pfn(&e) << GTT_PAGE_SHIFT) + + (gma & ~GTT_PAGE_MASK); + + trace_gma_translate(vgpu->id, "ppgtt", 0, + mm->page_table_level, gma, gpa); + return gpa; +err: + gvt_err("invalid mm type: %d gma %lx\n", mm->type, gma); + return INTEL_GVT_INVALID_ADDR; +} + +static int emulate_gtt_mmio_read(struct intel_vgpu *vgpu, + unsigned int off, void *p_data, unsigned int bytes) +{ + struct intel_vgpu_mm *ggtt_mm = vgpu->gtt.ggtt_mm; + const struct intel_gvt_device_info *info = &vgpu->gvt->device_info; + unsigned long index = off >> info->gtt_entry_size_shift; + struct intel_gvt_gtt_entry e; + + if (bytes != 4 && bytes != 8) + return -EINVAL; + + ggtt_get_guest_entry(ggtt_mm, &e, index); + memcpy(p_data, (void *)&e.val64 + (off & (info->gtt_entry_size - 1)), + bytes); + return 0; +} + +/** + * intel_vgpu_emulate_gtt_mmio_read - emulate GTT MMIO register read + * @vgpu: a vGPU + * @off: register offset + * @p_data: data will be returned to guest + * @bytes: data length + * + * This function is used to emulate the GTT MMIO register read + * + * Returns: + * Zero on success, error code if failed. + */ +int intel_vgpu_emulate_gtt_mmio_read(struct intel_vgpu *vgpu, unsigned int off, + void *p_data, unsigned int bytes) +{ + const struct intel_gvt_device_info *info = &vgpu->gvt->device_info; + int ret; + + if (bytes != 4 && bytes != 8) + return -EINVAL; + + off -= info->gtt_start_offset; + ret = emulate_gtt_mmio_read(vgpu, off, p_data, bytes); + return ret; +} + +static int emulate_gtt_mmio_write(struct intel_vgpu *vgpu, unsigned int off, + void *p_data, unsigned int bytes) +{ + struct intel_gvt *gvt = vgpu->gvt; + const struct intel_gvt_device_info *info = &gvt->device_info; + struct intel_vgpu_mm *ggtt_mm = vgpu->gtt.ggtt_mm; + struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops; + unsigned long g_gtt_index = off >> info->gtt_entry_size_shift; + unsigned long gma; + struct intel_gvt_gtt_entry e, m; + int ret; + + if (bytes != 4 && bytes != 8) + return -EINVAL; + + gma = g_gtt_index << GTT_PAGE_SHIFT; + + /* the VM may configure the whole GM space when ballooning is used */ + if (WARN_ONCE(!vgpu_gmadr_is_valid(vgpu, gma), + "vgpu%d: found oob ggtt write, offset %x\n", + vgpu->id, off)) { + return 0; + } + + ggtt_get_guest_entry(ggtt_mm, &e, g_gtt_index); + + memcpy((void *)&e.val64 + (off & (info->gtt_entry_size - 1)), p_data, + bytes); + + if (ops->test_present(&e)) { + ret = gtt_entry_p2m(vgpu, &e, &m); + if (ret) { + gvt_err("vgpu%d: fail to translate guest gtt entry\n", + vgpu->id); + return ret; + } + } else { + m = e; + m.val64 = 0; + } + + ggtt_set_shadow_entry(ggtt_mm, &m, g_gtt_index); + ggtt_set_guest_entry(ggtt_mm, &e, g_gtt_index); + return 0; +} + +/* + * intel_vgpu_emulate_gtt_mmio_write - emulate GTT MMIO register write + * @vgpu: a vGPU + * @off: register offset + * @p_data: data from guest write + * @bytes: data length + * + * This function is used to emulate the GTT MMIO register write + * + * Returns: + * Zero on success, error code if failed. + */ +int intel_vgpu_emulate_gtt_mmio_write(struct intel_vgpu *vgpu, unsigned int off, + void *p_data, unsigned int bytes) +{ + const struct intel_gvt_device_info *info = &vgpu->gvt->device_info; + int ret; + + if (bytes != 4 && bytes != 8) + return -EINVAL; + + off -= info->gtt_start_offset; + ret = emulate_gtt_mmio_write(vgpu, off, p_data, bytes); + return ret; +} + +static int create_scratch_page(struct intel_vgpu *vgpu) +{ + struct intel_vgpu_gtt *gtt = &vgpu->gtt; + void *p; + void *vaddr; + unsigned long mfn; + + gtt->scratch_page = alloc_page(GFP_KERNEL); + if (!gtt->scratch_page) { + gvt_err("Failed to allocate scratch page.\n"); + return -ENOMEM; + } + + /* set to zero */ + p = kmap_atomic(gtt->scratch_page); + memset(p, 0, PAGE_SIZE); + kunmap_atomic(p); + + /* translate page to mfn */ + vaddr = page_address(gtt->scratch_page); + mfn = intel_gvt_hypervisor_virt_to_mfn(vaddr); + + if (mfn == INTEL_GVT_INVALID_ADDR) { + gvt_err("fail to translate vaddr:0x%llx\n", (u64)vaddr); + __free_page(gtt->scratch_page); + gtt->scratch_page = NULL; + return -ENXIO; + } + + gtt->scratch_page_mfn = mfn; + gvt_dbg_core("vgpu%d create scratch page: mfn=0x%lx\n", vgpu->id, mfn); + return 0; +} + +static void release_scratch_page(struct intel_vgpu *vgpu) +{ + if (vgpu->gtt.scratch_page != NULL) { + __free_page(vgpu->gtt.scratch_page); + vgpu->gtt.scratch_page = NULL; + vgpu->gtt.scratch_page_mfn = 0; + } +} + +/** + * intel_vgpu_init_gtt - initialize per-vGPU graphics memory virulization + * @vgpu: a vGPU + * + * This function is used to initialize per-vGPU graphics memory virtualization + * components. + * + * Returns: + * Zero on success, error code if failed. + */ +int intel_vgpu_init_gtt(struct intel_vgpu *vgpu) +{ + struct intel_vgpu_gtt *gtt = &vgpu->gtt; + struct intel_vgpu_mm *ggtt_mm; + + hash_init(gtt->guest_page_hash_table); + hash_init(gtt->shadow_page_hash_table); + + INIT_LIST_HEAD(>t->mm_list_head); + INIT_LIST_HEAD(>t->oos_page_list_head); + INIT_LIST_HEAD(>t->post_shadow_list_head); + + ggtt_mm = intel_vgpu_create_mm(vgpu, INTEL_GVT_MM_GGTT, + NULL, 1, 0); + if (IS_ERR(ggtt_mm)) { + gvt_err("fail to create mm for ggtt.\n"); + return PTR_ERR(ggtt_mm); + } + + gtt->ggtt_mm = ggtt_mm; + + return create_scratch_page(vgpu); +} + +/** + * intel_vgpu_clean_gtt - clean up per-vGPU graphics memory virulization + * @vgpu: a vGPU + * + * This function is used to clean up per-vGPU graphics memory virtualization + * components. + * + * Returns: + * Zero on success, error code if failed. + */ +void intel_vgpu_clean_gtt(struct intel_vgpu *vgpu) +{ + struct list_head *pos, *n; + struct intel_vgpu_mm *mm; + + ppgtt_free_all_shadow_page(vgpu); + release_scratch_page(vgpu); + + list_for_each_safe(pos, n, &vgpu->gtt.mm_list_head) { + mm = container_of(pos, struct intel_vgpu_mm, list); + vgpu->gvt->gtt.mm_free_page_table(mm); + list_del(&mm->list); + list_del(&mm->lru_list); + kfree(mm); + } +} + +static void clean_spt_oos(struct intel_gvt *gvt) +{ + struct intel_gvt_gtt *gtt = &gvt->gtt; + struct list_head *pos, *n; + struct intel_vgpu_oos_page *oos_page; + + WARN(!list_empty(>t->oos_page_use_list_head), + "someone is still using oos page\n"); + + list_for_each_safe(pos, n, >t->oos_page_free_list_head) { + oos_page = container_of(pos, struct intel_vgpu_oos_page, list); + list_del(&oos_page->list); + kfree(oos_page); + } +} + +static int setup_spt_oos(struct intel_gvt *gvt) +{ + struct intel_gvt_gtt *gtt = &gvt->gtt; + struct intel_vgpu_oos_page *oos_page; + int i; + int ret; + + INIT_LIST_HEAD(>t->oos_page_free_list_head); + INIT_LIST_HEAD(>t->oos_page_use_list_head); + + for (i = 0; i < preallocated_oos_pages; i++) { + oos_page = kzalloc(sizeof(*oos_page), GFP_KERNEL); + if (!oos_page) { + gvt_err("fail to pre-allocate oos page\n"); + ret = -ENOMEM; + goto fail; + } + + INIT_LIST_HEAD(&oos_page->list); + INIT_LIST_HEAD(&oos_page->vm_list); + oos_page->id = i; + list_add_tail(&oos_page->list, >t->oos_page_free_list_head); + } + + gvt_dbg_mm("%d oos pages preallocated\n", i); + + return 0; +fail: + clean_spt_oos(gvt); + return ret; +} + +/** + * intel_vgpu_find_ppgtt_mm - find a PPGTT mm object + * @vgpu: a vGPU + * @page_table_level: PPGTT page table level + * @root_entry: PPGTT page table root pointers + * + * This function is used to find a PPGTT mm object from mm object pool + * + * Returns: + * pointer to mm object on success, NULL if failed. + */ +struct intel_vgpu_mm *intel_vgpu_find_ppgtt_mm(struct intel_vgpu *vgpu, + int page_table_level, void *root_entry) +{ + struct list_head *pos; + struct intel_vgpu_mm *mm; + u64 *src, *dst; + + list_for_each(pos, &vgpu->gtt.mm_list_head) { + mm = container_of(pos, struct intel_vgpu_mm, list); + if (mm->type != INTEL_GVT_MM_PPGTT) + continue; + + if (mm->page_table_level != page_table_level) + continue; + + src = root_entry; + dst = mm->virtual_page_table; + + if (page_table_level == 3) { + if (src[0] == dst[0] + && src[1] == dst[1] + && src[2] == dst[2] + && src[3] == dst[3]) + return mm; + } else { + if (src[0] == dst[0]) + return mm; + } + } + return NULL; +} + +/** + * intel_vgpu_g2v_create_ppgtt_mm - create a PPGTT mm object from + * g2v notification + * @vgpu: a vGPU + * @page_table_level: PPGTT page table level + * + * This function is used to create a PPGTT mm object from a guest to GVT-g + * notification. + * + * Returns: + * Zero on success, negative error code if failed. + */ +int intel_vgpu_g2v_create_ppgtt_mm(struct intel_vgpu *vgpu, + int page_table_level) +{ + u64 *pdp = (u64 *)&vgpu_vreg64(vgpu, vgtif_reg(pdp[0])); + struct intel_vgpu_mm *mm; + + if (WARN_ON((page_table_level != 4) && (page_table_level != 3))) + return -EINVAL; + + mm = intel_vgpu_find_ppgtt_mm(vgpu, page_table_level, pdp); + if (mm) { + intel_gvt_mm_reference(mm); + } else { + mm = intel_vgpu_create_mm(vgpu, INTEL_GVT_MM_PPGTT, + pdp, page_table_level, 0); + if (IS_ERR(mm)) { + gvt_err("fail to create mm\n"); + return PTR_ERR(mm); + } + } + return 0; +} + +/** + * intel_vgpu_g2v_destroy_ppgtt_mm - destroy a PPGTT mm object from + * g2v notification + * @vgpu: a vGPU + * @page_table_level: PPGTT page table level + * + * This function is used to create a PPGTT mm object from a guest to GVT-g + * notification. + * + * Returns: + * Zero on success, negative error code if failed. + */ +int intel_vgpu_g2v_destroy_ppgtt_mm(struct intel_vgpu *vgpu, + int page_table_level) +{ + u64 *pdp = (u64 *)&vgpu_vreg64(vgpu, vgtif_reg(pdp[0])); + struct intel_vgpu_mm *mm; + + if (WARN_ON((page_table_level != 4) && (page_table_level != 3))) + return -EINVAL; + + mm = intel_vgpu_find_ppgtt_mm(vgpu, page_table_level, pdp); + if (!mm) { + gvt_err("fail to find ppgtt instance.\n"); + return -EINVAL; + } + intel_gvt_mm_unreference(mm); + return 0; +} + +/** + * intel_gvt_init_gtt - initialize mm components of a GVT device + * @gvt: GVT device + * + * This function is called at the initialization stage, to initialize + * the mm components of a GVT device. + * + * Returns: + * zero on success, negative error code if failed. + */ +int intel_gvt_init_gtt(struct intel_gvt *gvt) +{ + int ret; + + gvt_dbg_core("init gtt\n"); + + if (IS_BROADWELL(gvt->dev_priv) || IS_SKYLAKE(gvt->dev_priv)) { + gvt->gtt.pte_ops = &gen8_gtt_pte_ops; + gvt->gtt.gma_ops = &gen8_gtt_gma_ops; + gvt->gtt.mm_alloc_page_table = gen8_mm_alloc_page_table; + gvt->gtt.mm_free_page_table = gen8_mm_free_page_table; + } else { + return -ENODEV; + } + + if (enable_out_of_sync) { + ret = setup_spt_oos(gvt); + if (ret) { + gvt_err("fail to initialize SPT oos\n"); + return ret; + } + } + INIT_LIST_HEAD(&gvt->gtt.mm_lru_list_head); + return 0; +} + +/** + * intel_gvt_clean_gtt - clean up mm components of a GVT device + * @gvt: GVT device + * + * This function is called at the driver unloading stage, to clean up the + * the mm components of a GVT device. + * + */ +void intel_gvt_clean_gtt(struct intel_gvt *gvt) +{ + if (enable_out_of_sync) + clean_spt_oos(gvt); +} |