diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_debugfs.c | 5 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_context.c | 222 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_context.h | 23 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_lrc.c | 8 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/selftests/mock_context.c | 11 |
6 files changed, 201 insertions, 70 deletions
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 4ad0e2ed8610..1f7051e97afb 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -1953,7 +1953,10 @@ static int i915_context_status(struct seq_file *m, void *unused) return ret; list_for_each_entry(ctx, &dev_priv->contexts.list, link) { - seq_printf(m, "HW context %u ", ctx->hw_id); + seq_puts(m, "HW context "); + if (!list_empty(&ctx->hw_id_link)) + seq_printf(m, "%x [pin %u]", ctx->hw_id, + atomic_read(&ctx->hw_id_pin_count)); if (ctx->pid) { struct task_struct *task; diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 5a4da5b723fd..767615ecdea5 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1861,6 +1861,7 @@ struct drm_i915_private { struct mutex av_mutex; struct { + struct mutex mutex; struct list_head list; struct llist_head free_list; struct work_struct free_work; @@ -1873,6 +1874,7 @@ struct drm_i915_private { #define MAX_CONTEXT_HW_ID (1<<21) /* exclusive */ #define MAX_GUC_CONTEXT_HW_ID (1 << 20) /* exclusive */ #define GEN11_MAX_CONTEXT_HW_ID (1<<11) /* exclusive */ + struct list_head hw_id_list; } contexts; u32 fdi_rx_config; diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index f15a039772db..747b8170a15a 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -115,6 +115,95 @@ static void lut_close(struct i915_gem_context *ctx) rcu_read_unlock(); } +static inline int new_hw_id(struct drm_i915_private *i915, gfp_t gfp) +{ + unsigned int max; + + lockdep_assert_held(&i915->contexts.mutex); + + if (INTEL_GEN(i915) >= 11) + max = GEN11_MAX_CONTEXT_HW_ID; + else if (USES_GUC_SUBMISSION(i915)) + /* + * When using GuC in proxy submission, GuC consumes the + * highest bit in the context id to indicate proxy submission. + */ + max = MAX_GUC_CONTEXT_HW_ID; + else + max = MAX_CONTEXT_HW_ID; + + return ida_simple_get(&i915->contexts.hw_ida, 0, max, gfp); +} + +static int steal_hw_id(struct drm_i915_private *i915) +{ + struct i915_gem_context *ctx, *cn; + LIST_HEAD(pinned); + int id = -ENOSPC; + + lockdep_assert_held(&i915->contexts.mutex); + + list_for_each_entry_safe(ctx, cn, + &i915->contexts.hw_id_list, hw_id_link) { + if (atomic_read(&ctx->hw_id_pin_count)) { + list_move_tail(&ctx->hw_id_link, &pinned); + continue; + } + + GEM_BUG_ON(!ctx->hw_id); /* perma-pinned kernel context */ + list_del_init(&ctx->hw_id_link); + id = ctx->hw_id; + break; + } + + /* + * Remember how far we got up on the last repossesion scan, so the + * list is kept in a "least recently scanned" order. + */ + list_splice_tail(&pinned, &i915->contexts.hw_id_list); + return id; +} + +static int assign_hw_id(struct drm_i915_private *i915, unsigned int *out) +{ + int ret; + + lockdep_assert_held(&i915->contexts.mutex); + + /* + * We prefer to steal/stall ourselves and our users over that of the + * entire system. That may be a little unfair to our users, and + * even hurt high priority clients. The choice is whether to oomkill + * something else, or steal a context id. + */ + ret = new_hw_id(i915, GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); + if (unlikely(ret < 0)) { + ret = steal_hw_id(i915); + if (ret < 0) /* once again for the correct errno code */ + ret = new_hw_id(i915, GFP_KERNEL); + if (ret < 0) + return ret; + } + + *out = ret; + return 0; +} + +static void release_hw_id(struct i915_gem_context *ctx) +{ + struct drm_i915_private *i915 = ctx->i915; + + if (list_empty(&ctx->hw_id_link)) + return; + + mutex_lock(&i915->contexts.mutex); + if (!list_empty(&ctx->hw_id_link)) { + ida_simple_remove(&i915->contexts.hw_ida, ctx->hw_id); + list_del_init(&ctx->hw_id_link); + } + mutex_unlock(&i915->contexts.mutex); +} + static void i915_gem_context_free(struct i915_gem_context *ctx) { unsigned int n; @@ -122,6 +211,7 @@ static void i915_gem_context_free(struct i915_gem_context *ctx) lockdep_assert_held(&ctx->i915->drm.struct_mutex); GEM_BUG_ON(!i915_gem_context_is_closed(ctx)); + release_hw_id(ctx); i915_ppgtt_put(ctx->ppgtt); for (n = 0; n < ARRAY_SIZE(ctx->__engine); n++) { @@ -136,7 +226,6 @@ static void i915_gem_context_free(struct i915_gem_context *ctx) list_del(&ctx->link); - ida_simple_remove(&ctx->i915->contexts.hw_ida, ctx->hw_id); kfree_rcu(ctx, rcu); } @@ -191,6 +280,12 @@ static void context_close(struct i915_gem_context *ctx) i915_gem_context_set_closed(ctx); /* + * This context will never again be assinged to HW, so we can + * reuse its ID for the next context. + */ + release_hw_id(ctx); + + /* * The LUT uses the VMA as a backpointer to unref the object, * so we need to clear the LUT before we close all the VMA (inside * the ppgtt). @@ -203,43 +298,6 @@ static void context_close(struct i915_gem_context *ctx) i915_gem_context_put(ctx); } -static int assign_hw_id(struct drm_i915_private *dev_priv, unsigned *out) -{ - int ret; - unsigned int max; - - if (INTEL_GEN(dev_priv) >= 11) { - max = GEN11_MAX_CONTEXT_HW_ID; - } else { - /* - * When using GuC in proxy submission, GuC consumes the - * highest bit in the context id to indicate proxy submission. - */ - if (USES_GUC_SUBMISSION(dev_priv)) - max = MAX_GUC_CONTEXT_HW_ID; - else - max = MAX_CONTEXT_HW_ID; - } - - - ret = ida_simple_get(&dev_priv->contexts.hw_ida, - 0, max, GFP_KERNEL); - if (ret < 0) { - /* Contexts are only released when no longer active. - * Flush any pending retires to hopefully release some - * stale contexts and try again. - */ - i915_retire_requests(dev_priv); - ret = ida_simple_get(&dev_priv->contexts.hw_ida, - 0, max, GFP_KERNEL); - if (ret < 0) - return ret; - } - - *out = ret; - return 0; -} - static u32 default_desc_template(const struct drm_i915_private *i915, const struct i915_hw_ppgtt *ppgtt) { @@ -276,12 +334,6 @@ __create_hw_context(struct drm_i915_private *dev_priv, if (ctx == NULL) return ERR_PTR(-ENOMEM); - ret = assign_hw_id(dev_priv, &ctx->hw_id); - if (ret) { - kfree(ctx); - return ERR_PTR(ret); - } - kref_init(&ctx->ref); list_add_tail(&ctx->link, &dev_priv->contexts.list); ctx->i915 = dev_priv; @@ -295,6 +347,7 @@ __create_hw_context(struct drm_i915_private *dev_priv, INIT_RADIX_TREE(&ctx->handles_vma, GFP_KERNEL); INIT_LIST_HEAD(&ctx->handles_list); + INIT_LIST_HEAD(&ctx->hw_id_link); /* Default context will never have a file_priv */ ret = DEFAULT_CONTEXT_HANDLE; @@ -421,15 +474,35 @@ out: return ctx; } +static void +destroy_kernel_context(struct i915_gem_context **ctxp) +{ + struct i915_gem_context *ctx; + + /* Keep the context ref so that we can free it immediately ourselves */ + ctx = i915_gem_context_get(fetch_and_zero(ctxp)); + GEM_BUG_ON(!i915_gem_context_is_kernel(ctx)); + + context_close(ctx); + i915_gem_context_free(ctx); +} + struct i915_gem_context * i915_gem_context_create_kernel(struct drm_i915_private *i915, int prio) { struct i915_gem_context *ctx; + int err; ctx = i915_gem_create_context(i915, NULL); if (IS_ERR(ctx)) return ctx; + err = i915_gem_context_pin_hw_id(ctx); + if (err) { + destroy_kernel_context(&ctx); + return ERR_PTR(err); + } + i915_gem_context_clear_bannable(ctx); ctx->sched.priority = prio; ctx->ring_size = PAGE_SIZE; @@ -439,17 +512,19 @@ i915_gem_context_create_kernel(struct drm_i915_private *i915, int prio) return ctx; } -static void -destroy_kernel_context(struct i915_gem_context **ctxp) +static void init_contexts(struct drm_i915_private *i915) { - struct i915_gem_context *ctx; + mutex_init(&i915->contexts.mutex); + INIT_LIST_HEAD(&i915->contexts.list); - /* Keep the context ref so that we can free it immediately ourselves */ - ctx = i915_gem_context_get(fetch_and_zero(ctxp)); - GEM_BUG_ON(!i915_gem_context_is_kernel(ctx)); + /* Using the simple ida interface, the max is limited by sizeof(int) */ + BUILD_BUG_ON(MAX_CONTEXT_HW_ID > INT_MAX); + BUILD_BUG_ON(GEN11_MAX_CONTEXT_HW_ID > INT_MAX); + ida_init(&i915->contexts.hw_ida); + INIT_LIST_HEAD(&i915->contexts.hw_id_list); - context_close(ctx); - i915_gem_context_free(ctx); + INIT_WORK(&i915->contexts.free_work, contexts_free_worker); + init_llist_head(&i915->contexts.free_list); } static bool needs_preempt_context(struct drm_i915_private *i915) @@ -470,14 +545,7 @@ int i915_gem_contexts_init(struct drm_i915_private *dev_priv) if (ret) return ret; - INIT_LIST_HEAD(&dev_priv->contexts.list); - INIT_WORK(&dev_priv->contexts.free_work, contexts_free_worker); - init_llist_head(&dev_priv->contexts.free_list); - - /* Using the simple ida interface, the max is limited by sizeof(int) */ - BUILD_BUG_ON(MAX_CONTEXT_HW_ID > INT_MAX); - BUILD_BUG_ON(GEN11_MAX_CONTEXT_HW_ID > INT_MAX); - ida_init(&dev_priv->contexts.hw_ida); + init_contexts(dev_priv); /* lowest priority; idle task */ ctx = i915_gem_context_create_kernel(dev_priv, I915_PRIORITY_MIN); @@ -487,9 +555,13 @@ int i915_gem_contexts_init(struct drm_i915_private *dev_priv) } /* * For easy recognisablity, we want the kernel context to be 0 and then - * all user contexts will have non-zero hw_id. + * all user contexts will have non-zero hw_id. Kernel contexts are + * permanently pinned, so that we never suffer a stall and can + * use them from any allocation context (e.g. for evicting other + * contexts and from inside the shrinker). */ GEM_BUG_ON(ctx->hw_id); + GEM_BUG_ON(!atomic_read(&ctx->hw_id_pin_count)); dev_priv->kernel_context = ctx; /* highest priority; preempting task */ @@ -527,6 +599,7 @@ void i915_gem_contexts_fini(struct drm_i915_private *i915) destroy_kernel_context(&i915->kernel_context); /* Must free all deferred contexts (via flush_workqueue) first */ + GEM_BUG_ON(!list_empty(&i915->contexts.hw_id_list)); ida_destroy(&i915->contexts.hw_ida); } @@ -932,6 +1005,33 @@ out: return ret; } +int __i915_gem_context_pin_hw_id(struct i915_gem_context *ctx) +{ + struct drm_i915_private *i915 = ctx->i915; + int err = 0; + + mutex_lock(&i915->contexts.mutex); + + GEM_BUG_ON(i915_gem_context_is_closed(ctx)); + + if (list_empty(&ctx->hw_id_link)) { + GEM_BUG_ON(atomic_read(&ctx->hw_id_pin_count)); + + err = assign_hw_id(i915, &ctx->hw_id); + if (err) + goto out_unlock; + + list_add_tail(&ctx->hw_id_link, &i915->contexts.hw_id_list); + } + + GEM_BUG_ON(atomic_read(&ctx->hw_id_pin_count) == ~0u); + atomic_inc(&ctx->hw_id_pin_count); + +out_unlock: + mutex_unlock(&i915->contexts.mutex); + return err; +} + #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) #include "selftests/mock_context.c" #include "selftests/i915_gem_context.c" diff --git a/drivers/gpu/drm/i915/i915_gem_context.h b/drivers/gpu/drm/i915/i915_gem_context.h index 851dad6decd7..e09673ca731d 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.h +++ b/drivers/gpu/drm/i915/i915_gem_context.h @@ -134,8 +134,16 @@ struct i915_gem_context { * functions like fault reporting, PASID, scheduling. The * &drm_i915_private.context_hw_ida is used to assign a unqiue * id for the lifetime of the context. + * + * @hw_id_pin_count: - number of times this context had been pinned + * for use (should be, at most, once per engine). + * + * @hw_id_link: - all contexts with an assigned id are tracked + * for possible repossession. */ unsigned int hw_id; + atomic_t hw_id_pin_count; + struct list_head hw_id_link; /** * @user_handle: userspace identifier @@ -254,6 +262,21 @@ static inline void i915_gem_context_set_force_single_submission(struct i915_gem_ __set_bit(CONTEXT_FORCE_SINGLE_SUBMISSION, &ctx->flags); } +int __i915_gem_context_pin_hw_id(struct i915_gem_context *ctx); +static inline int i915_gem_context_pin_hw_id(struct i915_gem_context *ctx) +{ + if (atomic_inc_not_zero(&ctx->hw_id_pin_count)) + return 0; + + return __i915_gem_context_pin_hw_id(ctx); +} + +static inline void i915_gem_context_unpin_hw_id(struct i915_gem_context *ctx) +{ + GEM_BUG_ON(atomic_read(&ctx->hw_id_pin_count) == 0u); + atomic_dec(&ctx->hw_id_pin_count); +} + static inline bool i915_gem_context_is_default(const struct i915_gem_context *c) { return c->user_handle == DEFAULT_CONTEXT_HANDLE; diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index def467c2451b..9b1f0e5211a0 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -1272,6 +1272,8 @@ static void execlists_context_destroy(struct intel_context *ce) static void execlists_context_unpin(struct intel_context *ce) { + i915_gem_context_unpin_hw_id(ce->gem_context); + intel_ring_unpin(ce->ring); ce->state->obj->pin_global--; @@ -1330,6 +1332,10 @@ __execlists_context_pin(struct intel_engine_cs *engine, if (ret) goto unpin_map; + ret = i915_gem_context_pin_hw_id(ctx); + if (ret) + goto unpin_ring; + intel_lr_context_descriptor_update(ctx, engine, ce); ce->lrc_reg_state = vaddr + LRC_STATE_PN * PAGE_SIZE; @@ -1342,6 +1348,8 @@ __execlists_context_pin(struct intel_engine_cs *engine, i915_gem_context_get(ctx); return ce; +unpin_ring: + intel_ring_unpin(ce->ring); unpin_map: i915_gem_object_unpin_map(ce->state->obj); unpin_vma: diff --git a/drivers/gpu/drm/i915/selftests/mock_context.c b/drivers/gpu/drm/i915/selftests/mock_context.c index 8904f1ce64e3..d937bdff26f9 100644 --- a/drivers/gpu/drm/i915/selftests/mock_context.c +++ b/drivers/gpu/drm/i915/selftests/mock_context.c @@ -43,6 +43,7 @@ mock_context(struct drm_i915_private *i915, INIT_RADIX_TREE(&ctx->handles_vma, GFP_KERNEL); INIT_LIST_HEAD(&ctx->handles_list); + INIT_LIST_HEAD(&ctx->hw_id_link); for (n = 0; n < ARRAY_SIZE(ctx->__engine); n++) { struct intel_context *ce = &ctx->__engine[n]; @@ -50,11 +51,9 @@ mock_context(struct drm_i915_private *i915, ce->gem_context = ctx; } - ret = ida_simple_get(&i915->contexts.hw_ida, - 0, MAX_CONTEXT_HW_ID, GFP_KERNEL); + ret = i915_gem_context_pin_hw_id(ctx); if (ret < 0) goto err_handles; - ctx->hw_id = ret; if (name) { ctx->name = kstrdup(name, GFP_KERNEL); @@ -85,11 +84,7 @@ void mock_context_close(struct i915_gem_context *ctx) void mock_init_contexts(struct drm_i915_private *i915) { - INIT_LIST_HEAD(&i915->contexts.list); - ida_init(&i915->contexts.hw_ida); - - INIT_WORK(&i915->contexts.free_work, contexts_free_worker); - init_llist_head(&i915->contexts.free_list); + init_contexts(i915); } struct i915_gem_context * |