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drm/vmwgfx: Implement an infrastructure for write-coherent resources

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This infrastructure will, for coherent resources, make sure that
from the user-space point of view, data written by the CPU is immediately
automatically available to the GPU at resource validation time.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Deepak Rawat <drawat@vmware.com>
This commit is contained in:
Thomas Hellstrom
2019-03-27 10:56:08 +01:00
parent c5acad84cf
commit b7468b15d2
11 changed files with 602 additions and 21 deletions
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71
drivers/gpu/drm/vmwgfx/vmwgfx_validation.c
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@@ -33,6 +33,8 @@
* struct vmw_validation_bo_node - Buffer object validation metadata.
* @base: Metadata used for TTM reservation- and validation.
* @hash: A hash entry used for the duplicate detection hash table.
* @coherent_count: If switching backup buffers, number of new coherent
* resources that will have this buffer as a backup buffer.
* @as_mob: Validate as mob.
* @cpu_blit: Validate for cpu blit access.
*
@@ -42,6 +44,7 @@
struct vmw_validation_bo_node {
struct ttm_validate_buffer base;
struct drm_hash_item hash;
unsigned int coherent_count;
u32 as_mob : 1;
u32 cpu_blit : 1;
};
@@ -459,6 +462,19 @@ int vmw_validation_res_reserve(struct vmw_validation_context *ctx,
if (ret)
goto out_unreserve;
}
if (val->switching_backup && val->new_backup &&
res->coherent) {
struct vmw_validation_bo_node *bo_node =
vmw_validation_find_bo_dup(ctx,
val->new_backup);
if (WARN_ON(!bo_node)) {
ret = -EINVAL;
goto out_unreserve;
}
bo_node->coherent_count++;
}
}
return 0;
@@ -565,6 +581,9 @@ int vmw_validation_bo_validate(struct vmw_validation_context *ctx, bool intr)
int ret;
list_for_each_entry(entry, &ctx->bo_list, base.head) {
struct vmw_buffer_object *vbo =
container_of(entry->base.bo, typeof(*vbo), base);
if (entry->cpu_blit) {
struct ttm_operation_ctx ctx = {
.interruptible = intr,
@@ -579,6 +598,27 @@ int vmw_validation_bo_validate(struct vmw_validation_context *ctx, bool intr)
}
if (ret)
return ret;
/*
* Rather than having the resource code allocating the bo
* dirty tracker in resource_unreserve() where we can't fail,
* Do it here when validating the buffer object.
*/
if (entry->coherent_count) {
unsigned int coherent_count = entry->coherent_count;
while (coherent_count) {
ret = vmw_bo_dirty_add(vbo);
if (ret)
return ret;
coherent_count--;
}
entry->coherent_count -= coherent_count;
}
if (vbo->dirty)
vmw_bo_dirty_scan(vbo);
}
return 0;
}
@@ -831,3 +871,34 @@ int vmw_validation_preload_res(struct vmw_validation_context *ctx,
ctx->mem_size_left += size;
return 0;
}
/**
* vmw_validation_bo_backoff - Unreserve buffer objects registered with a
* validation context
* @ctx: The validation context
*
* This function unreserves the buffer objects previously reserved using
* vmw_validation_bo_reserve. It's typically used as part of an error path
*/
void vmw_validation_bo_backoff(struct vmw_validation_context *ctx)
{
struct vmw_validation_bo_node *entry;
/*
* Switching coherent resource backup buffers failed.
* Release corresponding buffer object dirty trackers.
*/
list_for_each_entry(entry, &ctx->bo_list, base.head) {
if (entry->coherent_count) {
unsigned int coherent_count = entry->coherent_count;
struct vmw_buffer_object *vbo =
container_of(entry->base.bo, typeof(*vbo),
base);
while (coherent_count--)
vmw_bo_dirty_release(vbo);
}
}
ttm_eu_backoff_reservation(&ctx->ticket, &ctx->bo_list);
}