/*
* Copyright © 2016 Intel Corporation
*
* 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.
*
*/
#ifndef __I915_VMA_H__
#define __I915_VMA_H__
#include <linux/io-mapping.h>
#include <linux/rbtree.h>
#include <drm/drm_mm.h>
#include "i915_gem_gtt.h"
#include "i915_gem_fence_reg.h"
#include "i915_gem_object.h"
#include "i915_request.h"
enum i915_cache_level;
/**
* A VMA represents a GEM BO that is bound into an address space. Therefore, a
* VMA's presence cannot be guaranteed before binding, or after unbinding the
* object into/from the address space.
*
* To make things as simple as possible (ie. no refcounting), a VMA's lifetime
* will always be <= an objects lifetime. So object refcounting should cover us.
*/
struct i915_vma {
struct drm_mm_node node;
struct drm_i915_gem_object *obj;
struct i915_address_space *vm;
const struct i915_vma_ops *ops;
struct drm_i915_fence_reg *fence;
struct reservation_object *resv; /** Alias of obj->resv */
struct sg_table *pages;
void __iomem *iomap;
void *private; /* owned by creator */
u64 size;
u64 display_alignment;
struct i915_page_sizes page_sizes;
u32 fence_size;
u32 fence_alignment;
/**
* Count of the number of times this vma has been opened by different
* handles (but same file) for execbuf, i.e. the number of aliases
* that exist in the ctx->handle_vmas LUT for this vma.
*/
unsigned int open_count;
unsigned long flags;
/**
* How many users have pinned this object in GTT space. The following
* users can each hold at most one reference: pwrite/pread, execbuffer
* (objects are not allowed multiple times for the same batchbuffer),
* and the framebuffer code. When switching/pageflipping, the
* framebuffer code has at most two buffers pinned per crtc.
*
* In the worst case this is 1 + 1 + 1 + 2*2 = 7. That would fit into 3
* bits with absolutely no headroom. So use 4 bits.
*/
#define I915_VMA_PIN_MASK 0xf
#define I915_VMA_PIN_OVERFLOW BIT(5)
/** Flags and address space this VMA is bound to */
#define I915_VMA_GLOBAL_BIND BIT(6)
#define I915_VMA_LOCAL_BIND BIT(7)
#define I915_VMA_BIND_MASK (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND | I915_VMA_PIN_OVERFLOW)
#define I915_VMA_GGTT BIT(8)
#define I915_VMA_CAN_FENCE BIT(9)
#define I915_VMA_CLOSED BIT(10)
#define I915_VMA_USERFAULT_BIT 11
#define I915_VMA_USERFAULT BIT(I915_VMA_USERFAULT_BIT)
#define I915_VMA_GGTT_WRITE BIT(12)
unsigned int active_count;
struct rb_root active;
struct i915_gem_active last_active;
struct i915_gem_active last_fence;
/**
* Support different GGTT views into the same object.
* This means there can be multiple VMA mappings per object and per VM.
* i915_ggtt_view_type is used to distinguish between those entries.
* The default one of zero (I915_GGTT_VIEW_NORMAL) is default and also
* assumed in GEM functions which take no ggtt view parameter.
*/
struct i915_ggtt_view ggtt_view;
/** This object's place on the active/inactive lists */
struct list_head vm_link;
struct list_head obj_link; /* Link in the object's VMA list */
struct rb_node obj_node;
struct hlist_node obj_hash;
/** This vma's place in the execbuf reservation list */
struct list_head exec_link;
struct list_head reloc_link;
/** This vma's place in the eviction list */
struct list_head evict_link;
struct list_head closed_link;
/**
* Used for performing relocations during execbuffer insertion.
*/
unsigned int *exec_flags;
struct hlist_node exec_node;
u32 exec_handle;
};
struct i915_vma *
i915_vma_instance(struct drm_i915_gem_object *obj,
struct i915_address_space *vm,
const struct i915_ggtt_view *view);
void i915_vma_unpin_and_release(struct i915_vma **p_vma);
static inline bool i915_vma_is_active(struct i915_vma *vma)
{
return vma->active_count;
}
int __must_check i915_vma_move_to_active(struct i915_vma *vma,
struct i915_request *rq,
unsigned int flags);
static inline bool i915_vma_is_ggtt(const struct i915_vma *vma)
{
return vma->flags & I915_VMA_GGTT;
}
static inline bool i915_vma_has_ggtt_write(const struct i915_vma *vma)
{
return vma->flags & I915_VMA_GGTT_WRITE;
}
static inline void i915_vma_set_ggtt_write(struct i915_vma *vma)
{
GEM_BUG_ON(!i915_vma_is_ggtt(vma));
vma->flags |= I915_VMA_GGTT_WRITE;
}
static inline void i915_vma_unset_ggtt_write(struct i915_vma *vma)
{
vma->flags &= ~I915_VMA_GGTT_WRITE;
}
void i915_vma_flush_writes(struct i915_vma *vma);
static inline bool i915_vma_is_map_and_fenceable(const struct i915_vma *vma)
{
return vma->flags & I915_VMA_CAN_FENCE;
}
static inline bool i915_vma_is_closed(const struct i915_vma *vma)
{
return vma->flags & I915_VMA_CLOSED;
}
static inline bool i915_vma_set_userfault(struct i915_vma *vma)
{
GEM_BUG_ON(!i915_vma_is_map_and_fenceable(vma));
return __test_and_set_bit(I915_VMA_USERFAULT_BIT, &vma->flags);
}
static inline void i915_vma_unset_userfault(struct i915_vma *vma)
{
return __clear_bit(I915_VMA_USERFAULT_BIT, &vma->flags);
}
static inline bool i915_vma_has_userfault(const struct i915_vma *vma)
{
return test_bit(I915_VMA_USERFAULT_BIT, &vma->flags);
}
static inline u32 i915_ggtt_offset(const struct i915_vma *vma)
{
GEM_BUG_ON(!i915_vma_is_ggtt(vma));
GEM_BUG_ON(!vma->node.allocated);
GEM_BUG_ON(upper_32_bits(vma->node.start));
GEM_BUG_ON(upper_32_bits(vma->node.start + vma->node.size - 1));
return lower_32_bits(vma->node.start);
}
static inline struct i915_vma *i915_vma_get(struct i915_vma *vma)
{
i915_gem_object_get(vma->obj);
return vma;
}
static inline void i915_vma_put(struct i915_vma *vma)
{
i915_gem_object_put(vma->obj);
}
static __always_inline ptrdiff_t ptrdiff(const void *a, const void *b)
{
return a - b;
}
static inline long
i915_vma_compare(struct i915_vma *vma,
struct i915_address_space *vm,
const struct i915_ggtt_view *view)
{
ptrdiff_t cmp;
GEM_BUG_ON(view && !i915_is_ggtt(vm));
cmp = ptrdiff(vma->vm, vm);
if (cmp)
return cmp;
BUILD_BUG_ON(I915_GGTT_VIEW_NORMAL != 0);
cmp = vma->ggtt_view.type;
if (!view)
return cmp;
cmp -= view->type;
if (cmp)
return cmp;
/* ggtt_view.type also encodes its size so that we both distinguish
* different views using it as a "type" and also use a compact (no
* accessing of uninitialised padding bytes) memcmp without storing
* an extra parameter or adding more code.
*
* To ensure that the memcmp is valid for all branches of the union,
* even though the code looks like it is just comparing one branch,
* we assert above that all branches have the same address, and that
* each branch has a unique type/size.
*/
BUILD_BUG_ON(I915_GGTT_VIEW_NORMAL >= I915_GGTT_VIEW_PARTIAL);
BUILD_BUG_ON(I915_GGTT_VIEW_PARTIAL >= I915_GGTT_VIEW_ROTATED);
BUILD_BUG_ON(offsetof(typeof(*view), rotated) !=
offsetof(typeof(*view), partial));
return memcmp(&vma->ggtt_view.partial, &view->partial, view->type);
}
int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
u32 flags);
bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long cache_level);
bool i915_vma_misplaced(const struct i915_vma *vma,
u64 size, u64 alignment, u64 flags);
void __i915_vma_set_map_and_fenceable(struct i915_vma *vma);
void i915_vma_revoke_mmap(struct i915_vma *vma);
int __must_check i915_vma_unbind(struct i915_vma *vma);
void i915_vma_unlink_ctx(struct i915_vma *vma);
void i915_vma_close(struct i915_vma *vma);
void i915_vma_reopen(struct i915_vma *vma);
void i915_vma_destroy(struct i915_vma *vma);
int __i915_vma_do_pin(struct i915_vma *vma,
u64 size, u64 alignment, u64 flags);
static inline int __must_check
i915_vma_pin(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
{
BUILD_BUG_ON(PIN_MBZ != I915_VMA_PIN_OVERFLOW);
BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND);
BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND);
/* Pin early to prevent the shrinker/eviction logic from destroying
* our vma as we insert and bind.
*/
if (likely(((++vma->flags ^ flags) & I915_VMA_BIND_MASK) == 0)) {
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
return 0;
}
return __i915_vma_do_pin(vma, size, alignment, flags);
}
static inline int i915_vma_pin_count(const struct i915_vma *vma)
{
return vma->flags & I915_VMA_PIN_MASK;
}
static inline bool i915_vma_is_pinned(const struct i915_vma *vma)
{
return i915_vma_pin_count(vma);
}
static inline void __i915_vma_pin(struct i915_vma *vma)
{
vma->flags++;
GEM_BUG_ON(vma->flags & I915_VMA_PIN_OVERFLOW);
}
static inline void __i915_vma_unpin(struct i915_vma *vma)
{
vma->flags--;
}
static inline void i915_vma_unpin(struct i915_vma *vma)
{
GEM_BUG_ON(!i915_vma_is_pinned(vma));
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
__i915_vma_unpin(vma);
}
static inline bool i915_vma_is_bound(const struct i915_vma *vma,
unsigned int where)
{
return vma->flags & where;
}
/**
* i915_vma_pin_iomap - calls ioremap_wc to map the GGTT VMA via the aperture
* @vma: VMA to iomap
*
* The passed in VMA has to be pinned in the global GTT mappable region.
* An extra pinning of the VMA is acquired for the return iomapping,
* the caller must call i915_vma_unpin_iomap to relinquish the pinning
* after the iomapping is no longer required.
*
* Callers must hold the struct_mutex.
*
* Returns a valid iomapped pointer or ERR_PTR.
*/
void __iomem *i915_vma_pin_iomap(struct i915_vma *vma);
#define IO_ERR_PTR(x) ((void __iomem *)ERR_PTR(x))
/**
* i915_vma_unpin_iomap - unpins the mapping returned from i915_vma_iomap
* @vma: VMA to unpin
*
* Unpins the previously iomapped VMA from i915_vma_pin_iomap().
*
* Callers must hold the struct_mutex. This function is only valid to be
* called on a VMA previously iomapped by the caller with i915_vma_pin_iomap().
*/
void i915_vma_unpin_iomap(struct i915_vma *vma);
static inline struct page *i915_vma_first_page(struct i915_vma *vma)
{
GEM_BUG_ON(!vma->pages);
return sg_page(vma->pages->sgl);
}
/**
* i915_vma_pin_fence - pin fencing state
* @vma: vma to pin fencing for
*
* This pins the fencing state (whether tiled or untiled) to make sure the
* vma (and its object) is ready to be used as a scanout target. Fencing
* status must be synchronize first by calling i915_vma_get_fence():
*
* The resulting fence pin reference must be released again with
* i915_vma_unpin_fence().
*
* Returns:
*
* True if the vma has a fence, false otherwise.
*/
int i915_vma_pin_fence(struct i915_vma *vma);
int __must_check i915_vma_put_fence(struct i915_vma *vma);
static inline void __i915_vma_unpin_fence(struct i915_vma *vma)
{
GEM_BUG_ON(vma->fence->pin_count <= 0);
vma->fence->pin_count--;
}
/**
* i915_vma_unpin_fence - unpin fencing state
* @vma: vma to unpin fencing for
*
* This releases the fence pin reference acquired through
* i915_vma_pin_fence. It will handle both objects with and without an
* attached fence correctly, callers do not need to distinguish this.
*/
static inline void
i915_vma_unpin_fence(struct i915_vma *vma)
{
/* lockdep_assert_held(&vma->vm->i915->drm.struct_mutex); */
if (vma->fence)
__i915_vma_unpin_fence(vma);
}
void i915_vma_parked(struct drm_i915_private *i915);
#define for_each_until(cond) if (cond) break; else
/**
* for_each_ggtt_vma - Iterate over the GGTT VMA belonging to an object.
* @V: the #i915_vma iterator
* @OBJ: the #drm_i915_gem_object
*
* GGTT VMA are placed at the being of the object's vma_list, see
* vma_create(), so we can stop our walk as soon as we see a ppgtt VMA,
* or the list is empty ofc.
*/
#define for_each_ggtt_vma(V, OBJ) \
list_for_each_entry(V, &(OBJ)->vma_list, obj_link) \
for_each_until(!i915_vma_is_ggtt(V))
#endif
