gtt.c 61.7 KB
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/*
 * 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"
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#include "gvt.h"
#include "i915_pvinfo.h"
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#include "trace.h"

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#if defined(VERBOSE_DEBUG)
#define gvt_vdbg_mm(fmt, args...) gvt_dbg_mm(fmt, ##args)
#else
#define gvt_vdbg_mm(fmt, args...)
#endif

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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))) {
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		gvt_vgpu_err("invalid range gmadr 0x%llx size 0x%x\n",
				addr, size);
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		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;

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	ret = intel_gvt_ggtt_gmadr_g2h(vgpu, g_index << I915_GTT_PAGE_SHIFT,
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				       &h_addr);
	if (ret)
		return ret;

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	*h_index = h_addr >> I915_GTT_PAGE_SHIFT;
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	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;

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	ret = intel_gvt_ggtt_gmadr_h2g(vgpu, h_index << I915_GTT_PAGE_SHIFT,
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				       &g_addr);
	if (ret)
		return ret;

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	*g_index = g_addr >> I915_GTT_PAGE_SHIFT;
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	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)

/*
 * 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;
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	int pt_type;
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	int next_pt_type;
	int pse_entry_type;
};

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#define GTT_TYPE_TABLE_ENTRY(type, e_type, cpt_type, npt_type, pse_type) \
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	[type] = { \
		.entry_type = e_type, \
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		.pt_type = cpt_type, \
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		.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,
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			GTT_TYPE_INVALID,
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			GTT_TYPE_PPGTT_PML4_PT,
			GTT_TYPE_INVALID),
	GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PML4_PT,
			GTT_TYPE_PPGTT_PML4_ENTRY,
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			GTT_TYPE_PPGTT_PML4_PT,
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			GTT_TYPE_PPGTT_PDP_PT,
			GTT_TYPE_INVALID),
	GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PML4_ENTRY,
			GTT_TYPE_PPGTT_PML4_ENTRY,
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			GTT_TYPE_PPGTT_PML4_PT,
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			GTT_TYPE_PPGTT_PDP_PT,
			GTT_TYPE_INVALID),
	GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PDP_PT,
			GTT_TYPE_PPGTT_PDP_ENTRY,
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			GTT_TYPE_PPGTT_PDP_PT,
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			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,
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			GTT_TYPE_INVALID,
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			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,
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			GTT_TYPE_PPGTT_PDP_PT,
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			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,
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			GTT_TYPE_PPGTT_PDE_PT,
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			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,
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			GTT_TYPE_PPGTT_PDE_PT,
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			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,
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			GTT_TYPE_PPGTT_PTE_PT,
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			GTT_TYPE_INVALID,
			GTT_TYPE_INVALID),
	GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PTE_4K_ENTRY,
			GTT_TYPE_PPGTT_PTE_4K_ENTRY,
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			GTT_TYPE_PPGTT_PTE_PT,
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			GTT_TYPE_INVALID,
			GTT_TYPE_INVALID),
	GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PTE_2M_ENTRY,
			GTT_TYPE_PPGTT_PDE_ENTRY,
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			GTT_TYPE_PPGTT_PDE_PT,
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			GTT_TYPE_INVALID,
			GTT_TYPE_PPGTT_PTE_2M_ENTRY),
	GTT_TYPE_TABLE_ENTRY(GTT_TYPE_PPGTT_PTE_1G_ENTRY,
			GTT_TYPE_PPGTT_PDP_ENTRY,
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			GTT_TYPE_PPGTT_PDP_PT,
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			GTT_TYPE_INVALID,
			GTT_TYPE_PPGTT_PTE_1G_ENTRY),
	GTT_TYPE_TABLE_ENTRY(GTT_TYPE_GGTT_PTE,
			GTT_TYPE_GGTT_PTE,
			GTT_TYPE_INVALID,
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			GTT_TYPE_INVALID,
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			GTT_TYPE_INVALID),
};

static inline int get_next_pt_type(int type)
{
	return gtt_type_table[type].next_pt_type;
}

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static inline int get_pt_type(int type)
{
	return gtt_type_table[type].pt_type;
}

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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)
{
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	void __iomem *addr = (gen8_pte_t __iomem *)dev_priv->ggtt.gsm + index;
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	return readq(addr);
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}

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static void ggtt_invalidate(struct drm_i915_private *dev_priv)
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{
	mmio_hw_access_pre(dev_priv);
	I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN);
	mmio_hw_access_post(dev_priv);
}

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static void write_pte64(struct drm_i915_private *dev_priv,
		unsigned long index, u64 pte)
{
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	void __iomem *addr = (gen8_pte_t __iomem *)dev_priv->ggtt.gsm + index;
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	writeq(pte, addr);
}

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static inline int gtt_get_entry64(void *pt,
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		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))
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		return -EINVAL;
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	if (hypervisor_access) {
		ret = intel_gvt_hypervisor_read_gpa(vgpu, gpa +
				(index << info->gtt_entry_size_shift),
				&e->val64, 8);
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		if (WARN_ON(ret))
			return ret;
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	} else if (!pt) {
		e->val64 = read_pte64(vgpu->gvt->dev_priv, index);
	} else {
		e->val64 = *((u64 *)pt + index);
	}
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	return 0;
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}

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static inline int gtt_set_entry64(void *pt,
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		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))
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		return -EINVAL;
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	if (hypervisor_access) {
		ret = intel_gvt_hypervisor_write_gpa(vgpu, gpa +
				(index << info->gtt_entry_size_shift),
				&e->val64, 8);
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		if (WARN_ON(ret))
			return ret;
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	} else if (!pt) {
		write_pte64(vgpu->gvt->dev_priv, index, e->val64);
	} else {
		*((u64 *)pt + index) = e->val64;
	}
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	return 0;
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}

#define GTT_HAW 46

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#define ADDR_1G_MASK (((1UL << (GTT_HAW - 30)) - 1) << 30)
#define ADDR_2M_MASK (((1UL << (GTT_HAW - 21)) - 1) << 21)
#define ADDR_4K_MASK (((1UL << (GTT_HAW - 12)) - 1) << 12)
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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)
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		pfn = (e->val64 & ADDR_1G_MASK) >> PAGE_SHIFT;
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	else if (e->type == GTT_TYPE_PPGTT_PTE_2M_ENTRY)
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		pfn = (e->val64 & ADDR_2M_MASK) >> PAGE_SHIFT;
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	else
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		pfn = (e->val64 & ADDR_4K_MASK) >> PAGE_SHIFT;
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	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;
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		pfn &= (ADDR_1G_MASK >> PAGE_SHIFT);
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	} else if (e->type == GTT_TYPE_PPGTT_PTE_2M_ENTRY) {
		e->val64 &= ~ADDR_2M_MASK;
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		pfn &= (ADDR_2M_MASK >> PAGE_SHIFT);
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	} else {
		e->val64 &= ~ADDR_4K_MASK;
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		pfn &= (ADDR_4K_MASK >> PAGE_SHIFT);
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	}

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	e->val64 |= (pfn << PAGE_SHIFT);
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}

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);
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	if (!(e->val64 & _PAGE_PSE))
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		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
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		return (e->val64 & _PAGE_PRESENT);
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}

static void gtt_entry_clear_present(struct intel_gvt_gtt_entry *e)
{
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	e->val64 &= ~_PAGE_PRESENT;
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}

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static void gtt_entry_set_present(struct intel_gvt_gtt_entry *e)
{
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	e->val64 |= _PAGE_PRESENT;
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}

/*
 * Per-platform GMA routines.
 */
static unsigned long gma_to_ggtt_pte_index(unsigned long gma)
{
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	unsigned long x = (gma >> I915_GTT_PAGE_SHIFT);
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	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,
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	.set_present = gtt_entry_set_present,
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	.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,
};

/*
 * MM helpers.
 */
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static void _ppgtt_get_root_entry(struct intel_vgpu_mm *mm,
		struct intel_gvt_gtt_entry *entry, unsigned long index,
		bool guest)
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{
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	struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;
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	GEM_BUG_ON(mm->type != INTEL_GVT_MM_PPGTT);
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	entry->type = mm->ppgtt_mm.root_entry_type;
	pte_ops->get_entry(guest ? mm->ppgtt_mm.guest_pdps :
			   mm->ppgtt_mm.shadow_pdps,
			   entry, index, false, 0, mm->vgpu);
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	pte_ops->test_pse(entry);
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}

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static inline void ppgtt_get_guest_root_entry(struct intel_vgpu_mm *mm,
		struct intel_gvt_gtt_entry *entry, unsigned long index)
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{
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	_ppgtt_get_root_entry(mm, entry, index, true);
}

static inline void ppgtt_get_shadow_root_entry(struct intel_vgpu_mm *mm,
		struct intel_gvt_gtt_entry *entry, unsigned long index)
{
	_ppgtt_get_root_entry(mm, entry, index, false);
}

static void _ppgtt_set_root_entry(struct intel_vgpu_mm *mm,
		struct intel_gvt_gtt_entry *entry, unsigned long index,
		bool guest)
{
	struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;

	pte_ops->set_entry(guest ? mm->ppgtt_mm.guest_pdps :
			   mm->ppgtt_mm.shadow_pdps,
			   entry, index, false, 0, mm->vgpu);
}

static inline void ppgtt_set_guest_root_entry(struct intel_vgpu_mm *mm,
		struct intel_gvt_gtt_entry *entry, unsigned long index)
{
	_ppgtt_set_root_entry(mm, entry, index, true);
}

static inline void ppgtt_set_shadow_root_entry(struct intel_vgpu_mm *mm,
		struct intel_gvt_gtt_entry *entry, unsigned long index)
{
	_ppgtt_set_root_entry(mm, entry, index, false);
}

static void ggtt_get_guest_entry(struct intel_vgpu_mm *mm,
		struct intel_gvt_gtt_entry *entry, unsigned long index)
{
	struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;

	GEM_BUG_ON(mm->type != INTEL_GVT_MM_GGTT);

	entry->type = GTT_TYPE_GGTT_PTE;
	pte_ops->get_entry(mm->ggtt_mm.virtual_ggtt, entry, index,
			   false, 0, mm->vgpu);
}

static void ggtt_set_guest_entry(struct intel_vgpu_mm *mm,
		struct intel_gvt_gtt_entry *entry, unsigned long index)
{
	struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;

	GEM_BUG_ON(mm->type != INTEL_GVT_MM_GGTT);

	pte_ops->set_entry(mm->ggtt_mm.virtual_ggtt, entry, index,
			   false, 0, mm->vgpu);
}

static void ggtt_set_host_entry(struct intel_vgpu_mm *mm,
		struct intel_gvt_gtt_entry *entry, unsigned long index)
{
	struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;

	GEM_BUG_ON(mm->type != INTEL_GVT_MM_GGTT);
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	pte_ops->set_entry(NULL, entry, index, false, 0, mm->vgpu);
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}

/*
 * PPGTT shadow page table helpers.
 */
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static inline int ppgtt_spt_get_entry(
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		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;
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	int ret;
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	e->type = get_entry_type(type);

	if (WARN(!gtt_type_is_entry(e->type), "invalid entry type\n"))
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		return -EINVAL;
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	ret = ops->get_entry(page_table, e, index, guest,
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			spt->guest_page.track.gfn << I915_GTT_PAGE_SHIFT,
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			spt->vgpu);
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	if (ret)
		return ret;

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	ops->test_pse(e);
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	gvt_vdbg_mm("read ppgtt entry, spt type %d, entry type %d, index %lu, value %llx\n",
		    type, e->type, index, e->val64);
571
	return 0;
572 573
}

574
static inline int ppgtt_spt_set_entry(
575 576 577 578 579 580 581 582 583
		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"))
584
		return -EINVAL;
585

586 587 588
	gvt_vdbg_mm("set ppgtt entry, spt type %d, entry type %d, index %lu, value %llx\n",
		    type, e->type, index, e->val64);

589
	return ops->set_entry(page_table, e, index, guest,
590
			spt->guest_page.track.gfn << I915_GTT_PAGE_SHIFT,
591 592 593 594 595
			spt->vgpu);
}

#define ppgtt_get_guest_entry(spt, e, index) \
	ppgtt_spt_get_entry(spt, NULL, \
596
		spt->guest_page.type, e, index, true)
597 598 599

#define ppgtt_set_guest_entry(spt, e, index) \
	ppgtt_spt_set_entry(spt, NULL, \
600
		spt->guest_page.type, e, index, true)
601 602 603 604 605 606 607 608 609

#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)

610 611 612 613
#define page_track_to_ppgtt_spt(ptr) \
	container_of(ptr, struct intel_vgpu_ppgtt_spt, guest_page.track)

static void *alloc_spt(gfp_t gfp_mask)
614
{
615
	struct intel_vgpu_ppgtt_spt *spt;
616

617 618 619
	spt = kzalloc(sizeof(*spt), gfp_mask);
	if (!spt)
		return NULL;
620

621 622 623 624 625 626
	spt->shadow_page.page = alloc_page(gfp_mask);
	if (!spt->shadow_page.page) {
		kfree(spt);
		return NULL;
	}
	return spt;
627 628
}

629
static void free_spt(struct intel_vgpu_ppgtt_spt *spt)
630
{
631 632
	__free_page(spt->shadow_page.page);
	kfree(spt);
633 634 635
}

/**
636
 * intel_vgpu_find_tracked_page - find a tracked guest page
637 638 639
 * @vgpu: a vGPU
 * @gfn: guest memory page frame number
 *
640 641
 * This function is called when the emulation layer wants to figure out if a
 * trapped GFN is a tracked guest page.
642 643
 *
 * Returns:
644
 * Pointer to page track data structure, NULL if not found.
645
 */
646
struct intel_vgpu_page_track *intel_vgpu_find_tracked_page(
647 648
		struct intel_vgpu *vgpu, unsigned long gfn)
{
649
	struct intel_vgpu_page_track *t;
650

651 652 653 654
	hash_for_each_possible(vgpu->gtt.tracked_guest_page_hash_table,
			t, node, gfn) {
		if (t->gfn == gfn)
			return t;
655 656 657 658
	}
	return NULL;
}

659 660 661
static int detach_oos_page(struct intel_vgpu *vgpu,
		struct intel_vgpu_oos_page *oos_page);

662
static void ppgtt_free_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
663
{
664
	struct device *kdev = &spt->vgpu->gvt->dev_priv->drm.pdev->dev;
665

666
	trace_spt_free(spt->vgpu->id, spt, spt->guest_page.type);
667

668 669 670 671
	dma_unmap_page(kdev, spt->shadow_page.mfn << I915_GTT_PAGE_SHIFT, 4096,
		       PCI_DMA_BIDIRECTIONAL);
	if (!hlist_unhashed(&spt->node))
		hash_del(&spt->node);
672

673 674
	if (spt->guest_page.oos_page)
		detach_oos_page(spt->vgpu, spt->guest_page.oos_page);
675

676 677
	if (!hlist_unhashed(&spt->guest_page.track.node))
		hash_del(&spt->guest_page.track.node);
678

679 680 681
	if (spt->guest_page.track.tracked)
		intel_gvt_hypervisor_disable_page_track(spt->vgpu,
				&spt->guest_page.track);
682 683 684 685 686 687 688 689

	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;
690
	struct intel_vgpu_ppgtt_spt *spt;
691 692
	int i;

693 694
	hash_for_each_safe(vgpu->gtt.shadow_page_hash_table, i, n, spt, node)
		ppgtt_free_shadow_page(spt);
695 696
}

697
static int ppgtt_handle_guest_write_page_table_bytes(
698
		struct intel_vgpu_ppgtt_spt *spt,
699 700
		u64 pa, void *p_data, int bytes);

701
static int ppgtt_write_protection_handler(void *data, u64 pa,
702 703
		void *p_data, int bytes)
{
704
	struct intel_vgpu_page_track *t = data;
705
	struct intel_vgpu_ppgtt_spt *spt = page_track_to_ppgtt_spt(t);
706 707 708 709 710
	int ret;

	if (bytes != 4 && bytes != 8)
		return -EINVAL;

711
	if (!t->tracked)
712 713
		return -EINVAL;

714
	ret = ppgtt_handle_guest_write_page_table_bytes(spt,
715 716 717 718 719 720
		pa, p_data, bytes);
	if (ret)
		return ret;
	return ret;
}

721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746
/* Find a spt by guest gfn. */
static struct intel_vgpu_ppgtt_spt *intel_vgpu_find_spt_by_gfn(
		struct intel_vgpu *vgpu, unsigned long gfn)
{
	struct intel_vgpu_page_track *track;

	track = intel_vgpu_find_tracked_page(vgpu, gfn);
	if (track)
		return page_track_to_ppgtt_spt(track);

	return NULL;
}

/* Find the spt by shadow page mfn. */
static struct intel_vgpu_ppgtt_spt *intel_vgpu_find_spt_by_mfn(
		struct intel_vgpu *vgpu, unsigned long mfn)
{
	struct intel_vgpu_ppgtt_spt *spt;

	hash_for_each_possible(vgpu->gtt.shadow_page_hash_table, spt, node, mfn) {
		if (spt->shadow_page.mfn == mfn)
			return spt;
	}
	return NULL;
}

747
static int reclaim_one_ppgtt_mm(struct intel_gvt *gvt);
748 749 750 751

static struct intel_vgpu_ppgtt_spt *ppgtt_alloc_shadow_page(
		struct intel_vgpu *vgpu, int type, unsigned long gfn)
{
752
	struct device *kdev = &vgpu->gvt->dev_priv->drm.pdev->dev;
753
	struct intel_vgpu_ppgtt_spt *spt = NULL;
754
	dma_addr_t daddr;
755 756 757 758

retry:
	spt = alloc_spt(GFP_KERNEL | __GFP_ZERO);
	if (!spt) {
759
		if (reclaim_one_ppgtt_mm(vgpu->gvt))
760 761
			goto retry;

762
		gvt_vgpu_err("fail to allocate ppgtt shadow page\n");
763 764 765 766 767 768 769 770
		return ERR_PTR(-ENOMEM);
	}

	spt->vgpu = vgpu;
	atomic_set(&spt->refcount, 1);
	INIT_LIST_HEAD(&spt->post_shadow_list);

	/*
771
	 * Init shadow_page.
772
	 */
773 774 775 776 777 778 779
	spt->shadow_page.type = type;
	daddr = dma_map_page(kdev, spt->shadow_page.page,
			     0, 4096, PCI_DMA_BIDIRECTIONAL);
	if (dma_mapping_error(kdev, daddr)) {
		gvt_vgpu_err("fail to map dma addr\n");
		free_spt(spt);
		return ERR_PTR(-EINVAL);
780
	}
781 782
	spt->shadow_page.vaddr = page_address(spt->shadow_page.page);
	spt->shadow_page.mfn = daddr >> I915_GTT_PAGE_SHIFT;
783

784 785 786 787 788
	/*
	 * Init guest_page.
	 */
	spt->guest_page.type = type;
	spt->guest_page.gfn = gfn;
789

790 791 792 793
	spt->guest_page.track.gfn = gfn;
	spt->guest_page.track.handler = ppgtt_write_protection_handler;
	hash_add(vgpu->gtt.tracked_guest_page_hash_table,
		&spt->guest_page.track.node, gfn);
794

795 796
	INIT_HLIST_NODE(&spt->node);
	hash_add(vgpu->gtt.shadow_page_hash_table, &spt->node, spt->shadow_page.mfn);
797

798 799
	trace_spt_alloc(vgpu->id, spt, type, spt->shadow_page.mfn, gfn);
	return spt;
800 801 802 803 804 805
}

#define pt_entry_size_shift(spt) \
	((spt)->vgpu->gvt->device_info.gtt_entry_size_shift)

#define pt_entries(spt) \
806
	(I915_GTT_PAGE_SIZE >> pt_entry_size_shift(spt))
807 808 809

#define for_each_present_guest_entry(spt, e, i) \
	for (i = 0; i < pt_entries(spt); i++) \
810 811
		if (!ppgtt_get_guest_entry(spt, e, i) && \
		    spt->vgpu->gvt->gtt.pte_ops->test_present(e))
812 813 814

#define for_each_present_shadow_entry(spt, e, i) \
	for (i = 0; i < pt_entries(spt); i++) \
815 816
		if (!ppgtt_get_shadow_entry(spt, e, i) && \
		    spt->vgpu->gvt->gtt.pte_ops->test_present(e))
817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833

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;
834
	intel_gvt_gtt_type_t cur_pt_type;
835

836
	GEM_BUG_ON(!gtt_type_is_pt(get_next_pt_type(e->type)));
837

838 839 840 841 842 843 844
	if (e->type != GTT_TYPE_PPGTT_ROOT_L3_ENTRY
		&& e->type != GTT_TYPE_PPGTT_ROOT_L4_ENTRY) {
		cur_pt_type = get_next_pt_type(e->type) + 1;
		if (ops->get_pfn(e) ==
			vgpu->gtt.scratch_pt[cur_pt_type].page_mfn)
			return 0;
	}
845
	s = intel_vgpu_find_spt_by_mfn(vgpu, ops->get_pfn(e));
846
	if (!s) {
847 848
		gvt_vgpu_err("fail to find shadow page: mfn: 0x%lx\n",
				ops->get_pfn(e));
849 850 851 852 853 854 855
		return -ENXIO;
	}
	return ppgtt_invalidate_shadow_page(s);
}

static int ppgtt_invalidate_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
{
856
	struct intel_vgpu *vgpu = spt->vgpu;
857 858 859 860 861 862
	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,
863
			spt->guest_page.gfn, spt->shadow_page.type);
864 865 866 867 868 869 870 871 872 873

	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) {
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892
		switch (e.type) {
		case GTT_TYPE_PPGTT_PTE_4K_ENTRY:
			gvt_vdbg_mm("invalidate 4K entry\n");
			continue;
		case GTT_TYPE_PPGTT_PTE_2M_ENTRY:
		case GTT_TYPE_PPGTT_PTE_1G_ENTRY:
			WARN(1, "GVT doesn't support 2M/1GB page\n");
			continue;
		case GTT_TYPE_PPGTT_PML4_ENTRY:
		case GTT_TYPE_PPGTT_PDP_ENTRY:
		case GTT_TYPE_PPGTT_PDE_ENTRY:
			gvt_vdbg_mm("invalidate PMUL4/PDP/PDE entry\n");
			ret = ppgtt_invalidate_shadow_page_by_shadow_entry(
					spt->vgpu, &e);
			if (ret)
				goto fail;
			break;
		default:
			GEM_BUG_ON(1);
893 894 895 896
		}
	}
release:
	trace_spt_change(spt->vgpu->id, "release", spt,
897
			 spt->guest_page.gfn, spt->shadow_page.type);
898 899 900
	ppgtt_free_shadow_page(spt);
	return 0;
fail:
901 902
	gvt_vgpu_err("fail: shadow page %p shadow entry 0x%llx type %d\n",
			spt, e.val64, e.type);
903 904 905 906 907 908 909 910 911
	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;
912
	struct intel_vgpu_ppgtt_spt *spt = NULL;
913 914
	int ret;

915
	GEM_BUG_ON(!gtt_type_is_pt(get_next_pt_type(we->type)));
916

917 918 919 920
	spt = intel_vgpu_find_spt_by_gfn(vgpu, ops->get_pfn(we));
	if (spt)
		ppgtt_get_shadow_page(spt);
	else {
921 922
		int type = get_next_pt_type(we->type);

923 924 925
		spt = ppgtt_alloc_shadow_page(vgpu, type, ops->get_pfn(we));
		if (IS_ERR(spt)) {
			ret = PTR_ERR(spt);
926 927 928
			goto fail;
		}

929
		ret = intel_gvt_hypervisor_enable_page_track(vgpu, &spt->guest_page.track);
930 931 932
		if (ret)
			goto fail;

933
		ret = ppgtt_populate_shadow_page(spt);
934 935 936
		if (ret)
			goto fail;

937 938
		trace_spt_change(vgpu->id, "new", spt, spt->guest_page.gfn,
				 spt->shadow_page.type);
939
	}
940
	return spt;
941
fail:
942
	gvt_vgpu_err("fail: shadow page %p guest entry 0x%llx type %d\n",
943
		     spt, we->val64, we->type);
944 945 946 947 948 949 950 951 952 953 954 955 956 957
	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);
}

958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992
static int ppgtt_populate_shadow_entry(struct intel_vgpu *vgpu,
	struct intel_vgpu_ppgtt_spt *spt, unsigned long index,
	struct intel_gvt_gtt_entry *ge)
{
	struct intel_gvt_gtt_pte_ops *pte_ops = vgpu->gvt->gtt.pte_ops;
	struct intel_gvt_gtt_entry se = *ge;
	unsigned long gfn, mfn;

	if (!pte_ops->test_present(ge))
		return 0;

	gfn = pte_ops->get_pfn(ge);

	switch (ge->type) {
	case GTT_TYPE_PPGTT_PTE_4K_ENTRY:
		gvt_vdbg_mm("shadow 4K gtt entry\n");
		break;
	case GTT_TYPE_PPGTT_PTE_2M_ENTRY:
	case GTT_TYPE_PPGTT_PTE_1G_ENTRY:
		gvt_vgpu_err("GVT doesn't support 2M/1GB entry\n");
		return -EINVAL;
	default:
		GEM_BUG_ON(1);
	};

	/* direct shadow */
	mfn = intel_gvt_hypervisor_gfn_to_mfn(vgpu, gfn);
	if (mfn == INTEL_GVT_INVALID_ADDR)
		return -ENXIO;

	pte_ops->set_pfn(&se, mfn);
	ppgtt_set_shadow_entry(spt, &se, index);
	return 0;
}

993 994 995
static int ppgtt_populate_shadow_page(struct intel_vgpu_ppgtt_spt *spt)
{
	struct intel_vgpu *vgpu = spt->vgpu;
996 997
	struct intel_gvt *gvt = vgpu->gvt;
	struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
998 999
	struct intel_vgpu_ppgtt_spt *s;
	struct intel_gvt_gtt_entry se, ge;
1000
	unsigned long gfn, i;
1001 1002 1003
	int ret;

	trace_spt_change(spt->vgpu->id, "born", spt,
1004
			spt->guest_page.track.gfn, spt->shadow_page.type);
1005

1006 1007
	for_each_present_guest_entry(spt, &ge, i) {
		if (gtt_type_is_pt(get_next_pt_type(ge.type))) {
1008
			s = ppgtt_populate_shadow_page_by_guest_entry(vgpu, &ge);
1009 1010 1011 1012 1013 1014 1015 1016
			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);
		} else {
1017
			gfn = ops->get_pfn(&ge);
1018
			if (!intel_gvt_hypervisor_is_valid_gfn(vgpu, gfn)) {
1019
				ops->set_pfn(&se, gvt->gtt.scratch_mfn);
1020 1021 1022
				ppgtt_set_shadow_entry(spt, &se, i);
				continue;
			}
1023

1024 1025 1026
			ret = ppgtt_populate_shadow_entry(vgpu, spt, i, &ge);
			if (ret)
				goto fail;
1027 1028 1029 1030
		}
	}
	return 0;
fail:
1031 1032
	gvt_vgpu_err("fail: shadow page %p guest entry 0x%llx type %d\n",
			spt, ge.val64, ge.type);
1033 1034 1035
	return ret;
}

1036
static int ppgtt_handle_guest_entry_removal(struct intel_vgpu_ppgtt_spt *spt,
1037
		struct intel_gvt_gtt_entry *se, unsigned long index)
1038 1039 1040 1041 1042
{
	struct intel_vgpu *vgpu = spt->vgpu;
	struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
	int ret;

1043 1044
	trace_spt_guest_change(spt->vgpu->id, "remove", spt,
			       spt->shadow_page.type, se->val64, index);
1045

1046 1047 1048
	gvt_vdbg_mm("destroy old shadow entry, type %d, index %lu, value %llx\n",
		    se->type, index, se->val64);

1049
	if (!ops->test_present(se))
1050 1051
		return 0;

1052 1053
	if (ops->get_pfn(se) ==
	    vgpu->gtt.scratch_pt[spt->shadow_page.type].page_mfn)
1054 1055
		return 0;

1056
	if (gtt_type_is_pt(get_next_pt_type(se->type))) {
1057
		struct intel_vgpu_ppgtt_spt *s =
1058
			intel_vgpu_find_spt_by_mfn(vgpu, ops->get_pfn(se));
1059
		if (!s) {
1060
			gvt_vgpu_err("fail to find guest page\n");
1061 1062 1063
			ret = -ENXIO;
			goto fail;
		}
1064
		ret = ppgtt_invalidate_shadow_page(s);
1065 1066 1067 1068 1069
		if (ret)
			goto fail;
	}
	return 0;
fail:
1070
	gvt_vgpu_err("fail: shadow page %p guest entry 0x%llx type %d\n",
1071
			spt, se->val64, se->type);
1072 1073 1074
	return ret;
}

1075
static int ppgtt_handle_guest_entry_add(struct intel_vgpu_ppgtt_spt *spt,
1076 1077 1078 1079 1080 1081 1082
		struct intel_gvt_gtt_entry *we, unsigned long index)
{
	struct intel_vgpu *vgpu = spt->vgpu;
	struct intel_gvt_gtt_entry m;
	struct intel_vgpu_ppgtt_spt *s;
	int ret;

1083 1084
	trace_spt_guest_change(spt->vgpu->id, "add", spt, spt->shadow_page.type,
			       we->val64, index);
1085

1086 1087 1088
	gvt_vdbg_mm("add shadow entry: type %d, index %lu, value %llx\n",
		    we->type, index, we->val64);

1089 1090 1091 1092 1093 1094 1095 1096 1097 1098
	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 {
1099
		ret = ppgtt_populate_shadow_entry(vgpu, spt, index, we);
1100 1101 1102 1103 1104
		if (ret)
			goto fail;
	}
	return 0;
fail:
1105 1106
	gvt_vgpu_err("fail: spt %p guest entry 0x%llx type %d\n",
		spt, we->val64, we->type);
1107 1108 1109 1110 1111 1112 1113 1114 1115
	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;
1116
	struct intel_vgpu_ppgtt_spt *spt = oos_page->spt;
1117
	struct intel_gvt_gtt_entry old, new;
1118 1119 1120 1121
	int index;
	int ret;

	trace_oos_change(vgpu->id, "sync", oos_page->id,
1122
			 spt, spt->guest_page.type);
1123

1124
	old.type = new.type = get_entry_type(spt->guest_page.type);
1125 1126
	old.val64 = new.val64 = 0;

1127 1128
	for (index = 0; index < (I915_GTT_PAGE_SIZE >>
				info->gtt_entry_size_shift); index++) {
1129 1130
		ops->get_entry(oos_page->mem, &old, index, false, 0, vgpu);
		ops->get_entry(NULL, &new, index, true,
1131
			       spt->guest_page.gfn << PAGE_SHIFT, vgpu);
1132 1133 1134 1135 1136 1137

		if (old.val64 == new.val64
			&& !test_and_clear_bit(index, spt->post_shadow_bitmap))
			continue;

		trace_oos_sync(vgpu->id, oos_page->id,
1138
				spt, spt->guest_page.type,
1139 1140
				new.val64, index);

1141
		ret = ppgtt_populate_shadow_entry(vgpu, spt, index, &new);