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drm/ttm: Rework validation & memory space allocation (V3)

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This change allow driver to pass sorted memory placement,
from most prefered placement to least prefered placement.
In order to avoid long function prototype a structure is
used to gather memory placement informations such as range
restriction (if you need a buffer to be in given range).
Range restriction is determined by fpfn & lpfn which are
the first page and last page number btw which allocation
can happen. If those fields are set to 0 ttm will assume
buffer can be put anywhere in the address space (thus it
avoids putting a burden on the driver to always properly
set those fields).

This patch also factor few functions like evicting first
entry of lru list or getting a memory space. This avoid
code duplication.

V2: Change API to use placement flags and array instead
    of packing placement order into a quadword.
V3: Make sure we set the appropriate mem.placement flag
    when validating or allocation memory space.

[Pending Thomas Hellstrom further review but okay
from preliminary review so far].

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Jerome Glisse
2009-12-08 15:33:32 +01:00
committed by Dave Airlie
parent a2e68e92d3
commit ca262a9998
3 changed files with 259 additions and 272 deletions
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42
include/drm/ttm/ttm_bo_api.h
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@@ -44,6 +44,29 @@ struct ttm_bo_device;
struct drm_mm_node;
/**
* struct ttm_placement
*
* @fpfn: first valid page frame number to put the object
* @lpfn: last valid page frame number to put the object
* @num_placement: number of prefered placements
* @placement: prefered placements
* @num_busy_placement: number of prefered placements when need to evict buffer
* @busy_placement: prefered placements when need to evict buffer
*
* Structure indicating the placement you request for an object.
*/
struct ttm_placement {
unsigned fpfn;
unsigned lpfn;
unsigned num_placement;
const uint32_t *placement;
unsigned num_busy_placement;
const uint32_t *busy_placement;
};
/**
* struct ttm_mem_reg
*
@@ -109,10 +132,6 @@ struct ttm_tt;
* the object is destroyed.
* @event_queue: Queue for processes waiting on buffer object status change.
* @lock: spinlock protecting mostly synchronization members.
* @proposed_placement: Proposed placement for the buffer. Changed only by the
* creator prior to validation as opposed to bo->mem.proposed_flags which is
* changed by the implementation prior to a buffer move if it wants to outsmart
* the buffer creator / user. This latter happens, for example, at eviction.
* @mem: structure describing current placement.
* @persistant_swap_storage: Usually the swap storage is deleted for buffers
* pinned in physical memory. If this behaviour is not desired, this member
@@ -177,7 +196,6 @@ struct ttm_buffer_object {
* Members protected by the bo::reserved lock.
*/
uint32_t proposed_placement;
struct ttm_mem_reg mem;
struct file *persistant_swap_storage;
struct ttm_tt *ttm;
@@ -293,21 +311,22 @@ extern int ttm_bo_wait(struct ttm_buffer_object *bo, bool lazy,
* ttm_buffer_object_validate
*
* @bo: The buffer object.
* @proposed_placement: Proposed_placement for the buffer object.
* @placement: Proposed placement for the buffer object.
* @interruptible: Sleep interruptible if sleeping.
* @no_wait: Return immediately if the buffer is busy.
*
* Changes placement and caching policy of the buffer object
* according to bo::proposed_flags.
* according proposed placement.
* Returns
* -EINVAL on invalid proposed_flags.
* -EINVAL on invalid proposed placement.
* -ENOMEM on out-of-memory condition.
* -EBUSY if no_wait is true and buffer busy.
* -ERESTART if interrupted by a signal.
*/
extern int ttm_buffer_object_validate(struct ttm_buffer_object *bo,
uint32_t proposed_placement,
bool interruptible, bool no_wait);
struct ttm_placement *placement,
bool interruptible, bool no_wait);
/**
* ttm_bo_unref
*
@@ -445,7 +464,6 @@ extern int ttm_bo_check_placement(struct ttm_buffer_object *bo,
*
* @bdev: Pointer to a ttm_bo_device struct.
* @mem_type: The memory type.
* @p_offset: offset for managed area in pages.
* @p_size: size managed area in pages.
*
* Initialize a manager for a given memory type.
@@ -458,7 +476,7 @@ extern int ttm_bo_check_placement(struct ttm_buffer_object *bo,
*/
extern int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
unsigned long p_offset, unsigned long p_size);
unsigned long p_size);
/**
* ttm_bo_clean_mm
*