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drm/i915: Introduce a ww transaction helper

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Introduce a for_i915_gem_ww(){} utility to help make the code
around a ww transaction more readable.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210617063018.92802-4-thomas.hellstrom@linux.intel.com
This commit is contained in:
Thomas Hellström 2021-06-17 08:30:09 +02:00 committed by Matthew Auld
parent 5c43ec5d53
commit 3b86eb82dc
1 changed files with 30 additions and 1 deletions
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31
drivers/gpu/drm/i915/i915_gem_ww.h
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@ -11,11 +11,40 @@ struct i915_gem_ww_ctx {
struct ww_acquire_ctx ctx;
struct list_head obj_list;
struct drm_i915_gem_object *contended;
bool intr;
unsigned short intr;
unsigned short loop;
};
void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
/* Internal functions used by the inlines! Don't use. */
static inline int __i915_gem_ww_fini(struct i915_gem_ww_ctx *ww, int err)
{
ww->loop = 0;
if (err == -EDEADLK) {
err = i915_gem_ww_ctx_backoff(ww);
if (!err)
ww->loop = 1;
}
if (!ww->loop)
i915_gem_ww_ctx_fini(ww);
return err;
}
static inline void
__i915_gem_ww_init(struct i915_gem_ww_ctx *ww, bool intr)
{
i915_gem_ww_ctx_init(ww, intr);
ww->loop = 1;
}
#define for_i915_gem_ww(_ww, _err, _intr) \
for (__i915_gem_ww_init(_ww, _intr); (_ww)->loop; \
_err = __i915_gem_ww_fini(_ww, _err))
#endif