drm/xe/xe_bo.h

/* SPDX-License-Identifier: MIT */
/*
 * Copyright © 2021 Intel Corporation
 */

#ifndef _XE_BO_H_
#define _XE_BO_H_

#include <drm/drm_prime.h>
#include <drm/ttm/ttm_tt.h>

#include "xe_bo_types.h"
#include "xe_ggtt.h"
#include "xe_macros.h"
#include "xe_validation.h"
#include "xe_vm_types.h"
#include "xe_vm.h"
#include "xe_vram_types.h"

#define XE_DEFAULT_GTT_SIZE_MB          3072ULL /* 3GB by default */

#define XE_BO_FLAG_USER		BIT(0)
/* The bits below need to be contiguous, or things break */
#define XE_BO_FLAG_SYSTEM		BIT(1)
#define XE_BO_FLAG_VRAM0		BIT(2)
#define XE_BO_FLAG_VRAM1		BIT(3)
#define XE_BO_FLAG_VRAM_MASK		(XE_BO_FLAG_VRAM0 | XE_BO_FLAG_VRAM1)
/* -- */
#define XE_BO_FLAG_STOLEN		BIT(4)
#define XE_BO_FLAG_VRAM(vram)		(XE_BO_FLAG_VRAM0 << ((vram)->id))
#define XE_BO_FLAG_VRAM_IF_DGFX(tile)	(IS_DGFX(tile_to_xe(tile)) ? \
					 XE_BO_FLAG_VRAM((tile)->mem.vram) : \
					 XE_BO_FLAG_SYSTEM)
#define XE_BO_FLAG_GGTT			BIT(5)
#define XE_BO_FLAG_IGNORE_MIN_PAGE_SIZE BIT(6)
#define XE_BO_FLAG_PINNED		BIT(7)
#define XE_BO_FLAG_NO_RESV_EVICT	BIT(8)
#define XE_BO_FLAG_DEFER_BACKING	BIT(9)
#define XE_BO_FLAG_FORCE_WC		BIT(10)
#define XE_BO_FLAG_FIXED_PLACEMENT	BIT(11)
#define XE_BO_FLAG_PAGETABLE		BIT(12)
#define XE_BO_FLAG_NEEDS_CPU_ACCESS	BIT(13)
#define XE_BO_FLAG_NEEDS_UC		BIT(14)
#define XE_BO_FLAG_NEEDS_64K		BIT(15)
#define XE_BO_FLAG_NEEDS_2M		BIT(16)
#define XE_BO_FLAG_GGTT_INVALIDATE	BIT(17)
#define XE_BO_FLAG_PINNED_NORESTORE	BIT(18)
#define XE_BO_FLAG_PINNED_LATE_RESTORE	BIT(19)
#define XE_BO_FLAG_GGTT0		BIT(20)
#define XE_BO_FLAG_GGTT1		BIT(21)
#define XE_BO_FLAG_GGTT2		BIT(22)
#define XE_BO_FLAG_GGTT3		BIT(23)
#define XE_BO_FLAG_CPU_ADDR_MIRROR	BIT(24)
#define XE_BO_FLAG_FORCE_USER_VRAM	BIT(25)
#define XE_BO_FLAG_NO_COMPRESSION	BIT(26)
#define XE_BO_FLAG_NEEDS_1G		BIT(27)

/* this one is trigger internally only */
#define XE_BO_FLAG_INTERNAL_TEST	BIT(30)
#define XE_BO_FLAG_INTERNAL_64K		BIT(31)

#define XE_BO_FLAG_GGTT_ALL		(XE_BO_FLAG_GGTT0 | \
					 XE_BO_FLAG_GGTT1 | \
					 XE_BO_FLAG_GGTT2 | \
					 XE_BO_FLAG_GGTT3)

#define XE_BO_FLAG_GGTTx(tile) \
	(XE_BO_FLAG_GGTT0 << (tile)->id)

#define XE_PTE_SHIFT			12
#define XE_PAGE_SIZE			(1 << XE_PTE_SHIFT)
#define XE_PTE_MASK			(XE_PAGE_SIZE - 1)
#define XE_PDE_SHIFT			(XE_PTE_SHIFT - 3)
#define XE_PDES				(1 << XE_PDE_SHIFT)
#define XE_PDE_MASK			(XE_PDES - 1)

#define XE_64K_PTE_SHIFT		16
#define XE_64K_PAGE_SIZE		(1 << XE_64K_PTE_SHIFT)
#define XE_64K_PTE_MASK			(XE_64K_PAGE_SIZE - 1)
#define XE_64K_PDE_MASK			(XE_PDE_MASK >> 4)

#define XE_PL_SYSTEM		TTM_PL_SYSTEM
#define XE_PL_TT		TTM_PL_TT
#define XE_PL_VRAM0		TTM_PL_VRAM
#define XE_PL_VRAM1		(XE_PL_VRAM0 + 1)
#define XE_PL_STOLEN		(TTM_NUM_MEM_TYPES - 1)

#define XE_BO_PROPS_INVALID	(-1)

#define XE_PCI_BARRIER_MMAP_OFFSET	(0x50 << XE_PTE_SHIFT)

/**
 * enum xe_madv_purgeable_state - Buffer object purgeable state enumeration
 *
 * This enum defines the possible purgeable states for a buffer object,
 * allowing userspace to provide memory usage hints to the kernel for
 * better memory management under pressure.
 *
 * @XE_MADV_PURGEABLE_WILLNEED: The buffer object is needed and should not be purged.
 * This is the default state.
 * @XE_MADV_PURGEABLE_DONTNEED: The buffer object is not currently needed and can be
 * purged by the kernel under memory pressure.
 * @XE_MADV_PURGEABLE_PURGED: The buffer object has been purged by the kernel.
 *
 * Accessing a purged buffer will result in an error. Per i915 semantics,
 * once purged, a BO remains permanently invalid and must be destroyed and recreated.
 */
enum xe_madv_purgeable_state {
	XE_MADV_PURGEABLE_WILLNEED,
	XE_MADV_PURGEABLE_DONTNEED,
	XE_MADV_PURGEABLE_PURGED,
};

struct sg_table;

struct xe_bo *xe_bo_alloc(void);
void xe_bo_free(struct xe_bo *bo);

struct xe_bo *xe_bo_init_locked(struct xe_device *xe, struct xe_bo *bo,
				struct xe_tile *tile, struct dma_resv *resv,
				struct ttm_lru_bulk_move *bulk, size_t size,
				u16 cpu_caching, enum ttm_bo_type type,
				u32 flags, struct dma_buf *dma_buf,
				struct drm_exec *exec);
struct xe_bo *xe_bo_create_locked(struct xe_device *xe, struct xe_tile *tile,
				  struct xe_vm *vm, size_t size,
				  enum ttm_bo_type type, u32 flags,
				  struct drm_exec *exec);
struct xe_bo *xe_bo_create_user(struct xe_device *xe, struct xe_vm *vm, size_t size,
				u16 cpu_caching, u32 flags, struct drm_exec *exec);
struct xe_bo *xe_bo_create_pin_map(struct xe_device *xe, struct xe_tile *tile,
				   struct xe_vm *vm, size_t size,
				   enum ttm_bo_type type, u32 flags,
				   struct drm_exec *exec);
struct xe_bo *xe_bo_create_pin_map_novm(struct xe_device *xe, struct xe_tile *tile,
					size_t size, enum ttm_bo_type type, u32 flags,
					bool intr);
struct xe_bo *xe_bo_create_pin_range_novm(struct xe_device *xe, struct xe_tile *tile,
					  size_t size, u64 start, u64 end,
					  enum ttm_bo_type type, u32 flags);
struct xe_bo *
xe_bo_create_pin_map_at_novm(struct xe_device *xe, struct xe_tile *tile,
			     size_t size, u64 offset, enum ttm_bo_type type,
			     u32 flags, u64 alignment, bool intr);
struct xe_bo *xe_managed_bo_create_pin_map(struct xe_device *xe, struct xe_tile *tile,
					   size_t size, u32 flags);
void xe_managed_bo_unpin_map_no_vm(struct xe_bo *bo);
struct xe_bo *xe_managed_bo_create_from_data(struct xe_device *xe, struct xe_tile *tile,
					     const void *data, size_t size, u32 flags);
int xe_managed_bo_reinit_in_vram(struct xe_device *xe, struct xe_tile *tile, struct xe_bo **src);

int xe_bo_placement_for_flags(struct xe_device *xe, struct xe_bo *bo,
			      u32 bo_flags, enum ttm_bo_type type);

static inline struct xe_bo *ttm_to_xe_bo(const struct ttm_buffer_object *bo)
{
	return container_of(bo, struct xe_bo, ttm);
}

static inline struct xe_bo *gem_to_xe_bo(const struct drm_gem_object *obj)
{
	return container_of(obj, struct xe_bo, ttm.base);
}

#define xe_bo_device(bo) ttm_to_xe_device((bo)->ttm.bdev)

static inline struct xe_bo *xe_bo_get(struct xe_bo *bo)
{
	if (bo)
		drm_gem_object_get(&bo->ttm.base);

	return bo;
}

void xe_bo_put(struct xe_bo *bo);

/*
 * xe_bo_get_unless_zero() - Conditionally obtain a GEM object refcount on an
 * xe bo
 * @bo: The bo for which we want to obtain a refcount.
 *
 * There is a short window between where the bo's GEM object refcount reaches
 * zero and where we put the final ttm_bo reference. Code in the eviction- and
 * shrinking path should therefore attempt to grab a gem object reference before
 * trying to use members outside of the base class ttm object. This function is
 * intended for that purpose. On successful return, this function must be paired
 * with an xe_bo_put().
 *
 * Return: @bo on success, NULL on failure.
 */
static inline __must_check struct xe_bo *xe_bo_get_unless_zero(struct xe_bo *bo)
{
	if (!bo || !kref_get_unless_zero(&bo->ttm.base.refcount))
		return NULL;

	return bo;
}

static inline void __xe_bo_unset_bulk_move(struct xe_bo *bo)
{
	if (bo)
		ttm_bo_set_bulk_move(&bo->ttm, NULL);
}

static inline void xe_bo_assert_held(struct xe_bo *bo)
{
	if (bo)
		dma_resv_assert_held((bo)->ttm.base.resv);
}

int xe_bo_lock(struct xe_bo *bo, bool intr);

void xe_bo_unlock(struct xe_bo *bo);

static inline void xe_bo_unlock_vm_held(struct xe_bo *bo)
{
	if (bo) {
		XE_WARN_ON(bo->vm && bo->ttm.base.resv != xe_vm_resv(bo->vm));
		if (bo->vm)
			xe_vm_assert_held(bo->vm);
		else
			dma_resv_unlock(bo->ttm.base.resv);
	}
}

int xe_bo_pin_external(struct xe_bo *bo, bool in_place, struct drm_exec *exec);
int xe_bo_pin(struct xe_bo *bo, struct drm_exec *exec);
void xe_bo_unpin_external(struct xe_bo *bo);
void xe_bo_unpin(struct xe_bo *bo);
int xe_bo_validate(struct xe_bo *bo, struct xe_vm *vm, bool allow_res_evict,
		   struct drm_exec *exec);

static inline bool xe_bo_is_pinned(struct xe_bo *bo)
{
	return bo->ttm.pin_count;
}

static inline bool xe_bo_is_protected(const struct xe_bo *bo)
{
	return bo->pxp_key_instance;
}

/**
 * xe_bo_is_purged() - Check if buffer object has been purged
 * @bo: The buffer object to check
 *
 * Checks if the buffer object's backing store has been discarded by the
 * kernel due to memory pressure after being marked as purgeable (DONTNEED).
 * Once purged, the BO cannot be restored and any attempt to use it will fail.
 *
 * Context: Caller must hold the BO's dma-resv lock
 * Return: true if the BO has been purged, false otherwise
 */
static inline bool xe_bo_is_purged(struct xe_bo *bo)
{
	xe_bo_assert_held(bo);
	return bo->purgeable.state == XE_MADV_PURGEABLE_PURGED;
}

/**
 * xe_bo_madv_is_dontneed() - Check if BO is marked as DONTNEED
 * @bo: The buffer object to check
 *
 * Checks if userspace has marked this BO as DONTNEED (i.e., its contents
 * are not currently needed and can be discarded under memory pressure).
 * This is used internally to decide whether a BO is eligible for purging.
 *
 * Context: Caller must hold the BO's dma-resv lock
 * Return: true if the BO is marked DONTNEED, false otherwise
 */
static inline bool xe_bo_madv_is_dontneed(struct xe_bo *bo)
{
	xe_bo_assert_held(bo);
	return bo->purgeable.state == XE_MADV_PURGEABLE_DONTNEED;
}

void xe_bo_set_purgeable_state(struct xe_bo *bo, enum xe_madv_purgeable_state new_state);

/**
 * xe_bo_willneed_get_locked() - Acquire a WILLNEED holder on a BO
 * @bo: Buffer object
 *
 * Increments willneed_count and, on a 0->1 transition, promotes the BO
 * from DONTNEED to WILLNEED. PURGED is terminal and is never modified.
 *
 * Caller must hold the BO's dma-resv lock.
 */
static inline void xe_bo_willneed_get_locked(struct xe_bo *bo)
{
	xe_bo_assert_held(bo);

	/* Imported BOs are owned externally; do not track purgeability. */
	if (drm_gem_is_imported(&bo->ttm.base))
		return;

	if (bo->purgeable.willneed_count++ == 0 && xe_bo_madv_is_dontneed(bo))
		xe_bo_set_purgeable_state(bo, XE_MADV_PURGEABLE_WILLNEED);
}

/**
 * xe_bo_willneed_put_locked() - Release a WILLNEED holder on a BO
 * @bo: Buffer object
 *
 * Decrements willneed_count and, on a 1->0 transition, marks the BO
 * DONTNEED only if it still has VMAs (implying all active VMAs are
 * DONTNEED). If the last VMA is being removed, preserve the current BO
 * state to match the previous VMA-walk semantics.
 *
 * PURGED is terminal and the BO state is never modified.
 *
 * Caller must hold the BO's dma-resv lock.
 */
static inline void xe_bo_willneed_put_locked(struct xe_bo *bo)
{
	xe_bo_assert_held(bo);

	if (drm_gem_is_imported(&bo->ttm.base))
		return;

	xe_assert(xe_bo_device(bo), bo->purgeable.willneed_count > 0);
	if (--bo->purgeable.willneed_count == 0 && bo->purgeable.vma_count > 0 &&
	    !xe_bo_is_purged(bo))
		xe_bo_set_purgeable_state(bo, XE_MADV_PURGEABLE_DONTNEED);
}

/**
 * xe_bo_vma_count_inc_locked() - Account a new VMA on a BO
 * @bo: Buffer object
 *
 * Increments vma_count.
 *
 * Caller must hold the BO's dma-resv lock.
 */
static inline void xe_bo_vma_count_inc_locked(struct xe_bo *bo)
{
	xe_bo_assert_held(bo);

	if (drm_gem_is_imported(&bo->ttm.base))
		return;

	bo->purgeable.vma_count++;
}

/**
 * xe_bo_vma_count_dec_locked() - Account a VMA removal on a BO
 * @bo: Buffer object
 *
 * Decrements vma_count.
 *
 * Caller must hold the BO's dma-resv lock.
 */
static inline void xe_bo_vma_count_dec_locked(struct xe_bo *bo)
{
	xe_bo_assert_held(bo);

	if (drm_gem_is_imported(&bo->ttm.base))
		return;

	xe_assert(xe_bo_device(bo), bo->purgeable.vma_count > 0);
	bo->purgeable.vma_count--;
}

static inline void xe_bo_unpin_map_no_vm(struct xe_bo *bo)
{
	if (likely(bo)) {
		xe_bo_lock(bo, false);
		xe_bo_unpin(bo);
		xe_bo_unlock(bo);

		xe_bo_put(bo);
	}
}

bool xe_bo_is_xe_bo(struct ttm_buffer_object *bo);
dma_addr_t __xe_bo_addr(struct xe_bo *bo, u64 offset, size_t page_size);
dma_addr_t xe_bo_addr(struct xe_bo *bo, u64 offset, size_t page_size);

static inline dma_addr_t
xe_bo_main_addr(struct xe_bo *bo, size_t page_size)
{
	return xe_bo_addr(bo, 0, page_size);
}

/**
 * xe_bo_size() - Xe BO size
 * @bo: The bo object.
 *
 * Simple helper to return Xe BO's size.
 *
 * Return: Xe BO's size
 */
static inline size_t xe_bo_size(struct xe_bo *bo)
{
	return bo->ttm.base.size;
}

static inline u32
__xe_bo_ggtt_addr(struct xe_bo *bo, u8 tile_id)
{
	struct xe_ggtt_node *ggtt_node = bo->ggtt_node[tile_id];
	u64 offset;

	if (XE_WARN_ON(!ggtt_node))
		return 0;

	offset = xe_ggtt_node_addr(ggtt_node);
	XE_WARN_ON(offset + xe_bo_size(bo) > (1ull << 32));
	return offset;
}

static inline u32
xe_bo_ggtt_addr(struct xe_bo *bo)
{
	xe_assert(xe_bo_device(bo), bo->tile);

	return __xe_bo_ggtt_addr(bo, bo->tile->id);
}

int xe_bo_vmap(struct xe_bo *bo);
void xe_bo_vunmap(struct xe_bo *bo);
int xe_bo_read(struct xe_bo *bo, u64 offset, void *dst, int size);

bool mem_type_is_vram(u32 mem_type);
bool xe_bo_is_vram(struct xe_bo *bo);
bool xe_bo_is_visible_vram(struct xe_bo *bo);
bool xe_bo_is_stolen(struct xe_bo *bo);
bool xe_bo_is_stolen_devmem(struct xe_bo *bo);
bool xe_bo_is_vm_bound(struct xe_bo *bo);
bool xe_bo_has_single_placement(struct xe_bo *bo);
uint64_t vram_region_gpu_offset(struct ttm_resource *res);

bool xe_bo_can_migrate(struct xe_bo *bo, u32 mem_type);

int xe_bo_migrate(struct xe_bo *bo, u32 mem_type, struct ttm_operation_ctx *ctc,
		  struct drm_exec *exec);
int xe_bo_evict(struct xe_bo *bo, struct drm_exec *exec);

int xe_bo_evict_pinned(struct xe_bo *bo);
int xe_bo_notifier_prepare_pinned(struct xe_bo *bo);
int xe_bo_notifier_unprepare_pinned(struct xe_bo *bo);
int xe_bo_restore_pinned(struct xe_bo *bo);

int xe_bo_dma_unmap_pinned(struct xe_bo *bo);

extern const struct ttm_device_funcs xe_ttm_funcs;
extern const char *const xe_mem_type_to_name[];

int xe_gem_create_ioctl(struct drm_device *dev, void *data,
			struct drm_file *file);
int xe_gem_mmap_offset_ioctl(struct drm_device *dev, void *data,
			     struct drm_file *file);
void xe_bo_runtime_pm_release_mmap_offset(struct xe_bo *bo);

int xe_bo_dumb_create(struct drm_file *file_priv,
		      struct drm_device *dev,
		      struct drm_mode_create_dumb *args);

bool xe_bo_needs_ccs_pages(struct xe_bo *bo);

int xe_bo_decompress(struct xe_bo *bo);

static inline size_t xe_bo_ccs_pages_start(struct xe_bo *bo)
{
	return PAGE_ALIGN(xe_bo_size(bo));
}

/**
 * xe_bo_has_valid_ccs_bb - Check if CCS's BBs were setup for the BO.
 * @bo: the &xe_bo to check
 *
 * The CCS's BBs should only be setup by the driver VF, but it is safe
 * to call this function also by non-VF driver.
 *
 * Return: true iff the CCS's BBs are setup, false otherwise.
 */
static inline bool xe_bo_has_valid_ccs_bb(struct xe_bo *bo)
{
	return bo->bb_ccs[XE_SRIOV_VF_CCS_READ_CTX] &&
	       bo->bb_ccs[XE_SRIOV_VF_CCS_WRITE_CTX];
}

static inline bool xe_bo_has_pages(struct xe_bo *bo)
{
	if ((bo->ttm.ttm && ttm_tt_is_populated(bo->ttm.ttm)) ||
	    xe_bo_is_vram(bo))
		return true;

	return false;
}

void __xe_bo_release_dummy(struct kref *kref);

/**
 * xe_bo_put_deferred() - Put a buffer object with delayed final freeing
 * @bo: The bo to put.
 * @deferred: List to which to add the buffer object if we cannot put, or
 * NULL if the function is to put unconditionally.
 *
 * Since the final freeing of an object includes both sleeping and (!)
 * memory allocation in the dma_resv individualization, it's not ok
 * to put an object from atomic context nor from within a held lock
 * tainted by reclaim. In such situations we want to defer the final
 * freeing until we've exited the restricting context, or in the worst
 * case to a workqueue.
 * This function either puts the object if possible without the refcount
 * reaching zero, or adds it to the @deferred list if that was not possible.
 * The caller needs to follow up with a call to xe_bo_put_commit() to actually
 * put the bo iff this function returns true. It's safe to always
 * follow up with a call to xe_bo_put_commit().
 * TODO: It's TTM that is the villain here. Perhaps TTM should add an
 * interface like this.
 *
 * Return: true if @bo was the first object put on the @freed list,
 * false otherwise.
 */
static inline bool
xe_bo_put_deferred(struct xe_bo *bo, struct llist_head *deferred)
{
	if (!deferred) {
		xe_bo_put(bo);
		return false;
	}

	if (!kref_put(&bo->ttm.base.refcount, __xe_bo_release_dummy))
		return false;

	return llist_add(&bo->freed, deferred);
}

void xe_bo_put_commit(struct llist_head *deferred);

/**
 * xe_bo_put_async() - Put BO async
 * @bo: The bo to put.
 *
 * Put BO async, the final put is deferred to a worker to exit an IRQ context.
 */
static inline void
xe_bo_put_async(struct xe_bo *bo)
{
	struct xe_bo_dev *bo_device = &xe_bo_device(bo)->bo_device;

	if (xe_bo_put_deferred(bo, &bo_device->async_list))
		schedule_work(&bo_device->async_free);
}

void xe_bo_dev_init(struct xe_bo_dev *bo_device);

void xe_bo_dev_fini(struct xe_bo_dev *bo_device);

struct sg_table *xe_bo_sg(struct xe_bo *bo);

/**
 * xe_bo_sg_is_contiguous() - Check if a BO's DMA address space is contiguous.
 * @bo: the BO to check (must have a valid sg table, i.e. !xe_bo_is_vram())
 * @len: required contiguous length in bytes
 *
 * Returns true if the first @len bytes of the BO are mapped to a contiguous
 * DMA address range.
 */
static inline bool xe_bo_sg_is_contiguous(struct xe_bo *bo, size_t len)
{
	return drm_prime_get_contiguous_size(xe_bo_sg(bo)) >= len;
}

/*
 * xe_sg_segment_size() - Provides upper limit for sg segment size.
 * @dev: device pointer
 *
 * Returns the maximum segment size for the 'struct scatterlist'
 * elements.
 */
static inline unsigned int xe_sg_segment_size(struct device *dev)
{
	struct scatterlist __maybe_unused sg;
	size_t max = BIT_ULL(sizeof(sg.length) * 8) - 1;

	max = min_t(size_t, max, dma_max_mapping_size(dev));

	/*
	 * The iommu_dma_map_sg() function ensures iova allocation doesn't
	 * cross dma segment boundary. It does so by padding some sg elements.
	 * This can cause overflow, ending up with sg->length being set to 0.
	 * Avoid this by ensuring maximum segment size is half of 'max'
	 * rounded down to PAGE_SIZE.
	 */
	return round_down(max / 2, PAGE_SIZE);
}

/**
 * struct xe_bo_shrink_flags - flags governing the shrink behaviour.
 * @purge: Only purging allowed. Don't shrink if bo not purgeable.
 * @writeback: Attempt to immediately move content to swap.
 */
struct xe_bo_shrink_flags {
	u32 purge : 1;
	u32 writeback : 1;
};

long xe_bo_shrink(struct ttm_operation_ctx *ctx, struct ttm_buffer_object *bo,
		  const struct xe_bo_shrink_flags flags,
		  unsigned long *scanned);

/**
 * xe_bo_is_mem_type - Whether the bo currently resides in the given
 * TTM memory type
 * @bo: The bo to check.
 * @mem_type: The TTM memory type.
 *
 * Return: true iff the bo resides in @mem_type, false otherwise.
 */
static inline bool xe_bo_is_mem_type(struct xe_bo *bo, u32 mem_type)
{
	xe_bo_assert_held(bo);
	return bo->ttm.resource->mem_type == mem_type;
}
#endif