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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2021-01-14 16:56:11 +0300 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2021-01-15 11:00:03 +0300 |
| commit | 2d60d3e0a2a286b8d0ff7102fc7555dd33ad3faf (patch) | |
| tree | 39d96492c32f2d88b8f2cf3e16a4a76ac09ced96 /drivers/gpu/drm/i915/gem | |
| parent | 1a72e7414d15ca417e60649b5dc7375f302e4cdf (diff) | |
| download | linux-2d60d3e0a2a286b8d0ff7102fc7555dd33ad3faf.tar.xz | |
drm/i915/gem: Reduce ctx->engines_mutex for get_engines()
Take a snapshot of the ctx->engines, so we can avoid taking the
ctx->engines_mutex for a mere read in get_engines().
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Andi Shyti <andi.shyti@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210114135612.13210-4-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/gem')
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_context.c | 39 |
1 files changed, 8 insertions, 31 deletions
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index 4a709c625ccb..4d2f40cf237b 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -1843,27 +1843,6 @@ replace: return 0; } -static struct i915_gem_engines * -__copy_engines(struct i915_gem_engines *e) -{ - struct i915_gem_engines *copy; - unsigned int n; - - copy = alloc_engines(e->num_engines); - if (!copy) - return ERR_PTR(-ENOMEM); - - for (n = 0; n < e->num_engines; n++) { - if (e->engines[n]) - copy->engines[n] = intel_context_get(e->engines[n]); - else - copy->engines[n] = NULL; - } - copy->num_engines = n; - - return copy; -} - static int get_engines(struct i915_gem_context *ctx, struct drm_i915_gem_context_param *args) @@ -1871,19 +1850,17 @@ get_engines(struct i915_gem_context *ctx, struct i915_context_param_engines __user *user; struct i915_gem_engines *e; size_t n, count, size; + bool user_engines; int err = 0; - err = mutex_lock_interruptible(&ctx->engines_mutex); - if (err) - return err; + e = __context_engines_await(ctx, &user_engines); + if (!e) + return -ENOENT; - e = NULL; - if (i915_gem_context_user_engines(ctx)) - e = __copy_engines(i915_gem_context_engines(ctx)); - mutex_unlock(&ctx->engines_mutex); - if (IS_ERR_OR_NULL(e)) { + if (!user_engines) { + i915_sw_fence_complete(&e->fence); args->size = 0; - return PTR_ERR_OR_ZERO(e); + return 0; } count = e->num_engines; @@ -1934,7 +1911,7 @@ get_engines(struct i915_gem_context *ctx, args->size = size; err_free: - free_engines(e); + i915_sw_fence_complete(&e->fence); return err; } |