From: Thomas Hellström thomas.hellstrom@intel.com
As we're about to add more ww-related functionality, break out the dma_resv ww locking utilities to their own files
Signed-off-by: Thomas Hellström thomas.hellstrom@intel.com Cc: Matthew Auld matthew.auld@intel.com --- drivers/gpu/drm/i915/Makefile | 1 + drivers/gpu/drm/i915/gem/i915_gem_object.h | 1 + drivers/gpu/drm/i915/gt/intel_renderstate.h | 1 + drivers/gpu/drm/i915/i915_gem.c | 59 ------------------ drivers/gpu/drm/i915/i915_gem.h | 12 ---- drivers/gpu/drm/i915/i915_gem_ww.c | 66 +++++++++++++++++++++ drivers/gpu/drm/i915/i915_gem_ww.h | 21 +++++++ 7 files changed, 90 insertions(+), 71 deletions(-) create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.c create mode 100644 drivers/gpu/drm/i915/i915_gem_ww.h
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 5112e5d79316..ec361d61230b 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -45,6 +45,7 @@ i915-y += i915_drv.o \ i915_switcheroo.o \ i915_sysfs.o \ i915_utils.o \ + i915_gem_ww.o \ intel_device_info.o \ intel_dram.o \ intel_memory_region.o \ diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h index 60e27738c39d..c6c7ab181a65 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h @@ -15,6 +15,7 @@ #include "i915_gem_object_types.h" #include "i915_gem_gtt.h" #include "i915_vma_types.h" +#include "i915_gem_ww.h"
void i915_gem_init__objects(struct drm_i915_private *i915);
diff --git a/drivers/gpu/drm/i915/gt/intel_renderstate.h b/drivers/gpu/drm/i915/gt/intel_renderstate.h index 713aa1e86c80..d9db833b873b 100644 --- a/drivers/gpu/drm/i915/gt/intel_renderstate.h +++ b/drivers/gpu/drm/i915/gt/intel_renderstate.h @@ -26,6 +26,7 @@
#include <linux/types.h> #include "i915_gem.h" +#include "i915_gem_ww.h"
struct i915_request; struct intel_context; diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 2248e65cf5f9..2662d679db6e 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1326,65 +1326,6 @@ int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file) return ret; }
-void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ww, bool intr) -{ - ww_acquire_init(&ww->ctx, &reservation_ww_class); - INIT_LIST_HEAD(&ww->obj_list); - ww->intr = intr; - ww->contended = NULL; -} - -static void i915_gem_ww_ctx_unlock_all(struct i915_gem_ww_ctx *ww) -{ - struct drm_i915_gem_object *obj; - - while ((obj = list_first_entry_or_null(&ww->obj_list, struct drm_i915_gem_object, obj_link))) { - list_del(&obj->obj_link); - i915_gem_object_unlock(obj); - } -} - -void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj) -{ - list_del(&obj->obj_link); - i915_gem_object_unlock(obj); -} - -void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ww) -{ - i915_gem_ww_ctx_unlock_all(ww); - WARN_ON(ww->contended); - ww_acquire_fini(&ww->ctx); -} - -int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ww) -{ - int ret = 0; - - if (WARN_ON(!ww->contended)) - return -EINVAL; - - i915_gem_ww_ctx_unlock_all(ww); - if (ww->intr) - ret = dma_resv_lock_slow_interruptible(ww->contended->base.resv, &ww->ctx); - else - dma_resv_lock_slow(ww->contended->base.resv, &ww->ctx); - - /* - * Unlocking the contended lock again, as might not need it in - * the retried transaction. This does not increase starvation, - * but it's opening up for a wakeup flood if there are many - * transactions relaxing on this object. - */ - if (!ret) - dma_resv_unlock(ww->contended->base.resv); - - i915_gem_object_put(ww->contended); - ww->contended = NULL; - - return ret; -} - #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) #include "selftests/mock_gem_device.c" #include "selftests/i915_gem.c" diff --git a/drivers/gpu/drm/i915/i915_gem.h b/drivers/gpu/drm/i915/i915_gem.h index a4cad3f154ca..f333e88a2b6e 100644 --- a/drivers/gpu/drm/i915/i915_gem.h +++ b/drivers/gpu/drm/i915/i915_gem.h @@ -116,16 +116,4 @@ static inline bool __tasklet_is_scheduled(struct tasklet_struct *t) return test_bit(TASKLET_STATE_SCHED, &t->state); }
-struct i915_gem_ww_ctx { - struct ww_acquire_ctx ctx; - struct list_head obj_list; - bool intr; - struct drm_i915_gem_object *contended; -}; - -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); - #endif /* __I915_GEM_H__ */ diff --git a/drivers/gpu/drm/i915/i915_gem_ww.c b/drivers/gpu/drm/i915/i915_gem_ww.c new file mode 100644 index 000000000000..43960d8595eb --- /dev/null +++ b/drivers/gpu/drm/i915/i915_gem_ww.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2020 Intel Corporation + */ +#include <linux/dma-resv.h> +#include "i915_gem_ww.h" +#include "gem/i915_gem_object.h" + +void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ww, bool intr) +{ + ww_acquire_init(&ww->ctx, &reservation_ww_class); + INIT_LIST_HEAD(&ww->obj_list); + ww->intr = intr; + ww->contended = NULL; +} + +static void i915_gem_ww_ctx_unlock_all(struct i915_gem_ww_ctx *ww) +{ + struct drm_i915_gem_object *obj; + + while ((obj = list_first_entry_or_null(&ww->obj_list, struct drm_i915_gem_object, obj_link))) { + list_del(&obj->obj_link); + i915_gem_object_unlock(obj); + } +} + +void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj) +{ + list_del(&obj->obj_link); + i915_gem_object_unlock(obj); +} + +void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ww) +{ + i915_gem_ww_ctx_unlock_all(ww); + WARN_ON(ww->contended); + ww_acquire_fini(&ww->ctx); +} + +int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ww) +{ + int ret = 0; + + if (WARN_ON(!ww->contended)) + return -EINVAL; + + i915_gem_ww_ctx_unlock_all(ww); + if (ww->intr) + ret = dma_resv_lock_slow_interruptible(ww->contended->base.resv, &ww->ctx); + else + dma_resv_lock_slow(ww->contended->base.resv, &ww->ctx); + + /* + * Unlocking the contended lock again, as might not need it in + * the retried transaction. This does not increase starvation, + * but it's opening up for a wakeup flood if there are many + * transactions relaxing on this object. + */ + if (!ret) + dma_resv_unlock(ww->contended->base.resv); + + i915_gem_object_put(ww->contended); + ww->contended = NULL; + + return ret; +} diff --git a/drivers/gpu/drm/i915/i915_gem_ww.h b/drivers/gpu/drm/i915/i915_gem_ww.h new file mode 100644 index 000000000000..f2d8769e4118 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_gem_ww.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: MIT */ +/* + * Copyright © 2020 Intel Corporation + */ +#ifndef __I915_GEM_WW_H__ +#define __I915_GEM_WW_H__ + +#include <drm/drm_drv.h> + +struct i915_gem_ww_ctx { + struct ww_acquire_ctx ctx; + struct list_head obj_list; + struct drm_i915_gem_object *contended; + bool intr; +}; + +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); +#endif