diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_lrc.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_lrc.c | 2097 |
1 files changed, 0 insertions, 2097 deletions
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c deleted file mode 100644 index 7404cf2aac28..000000000000 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ /dev/null @@ -1,2097 +0,0 @@ -/* - * Copyright © 2014 Intel Corporation - * - * Permission is hereby granted, free of charge, to any person obtaining a - * copy of this software and associated documentation files (the "Software"), - * to deal in the Software without restriction, including without limitation - * the rights to use, copy, modify, merge, publish, distribute, sublicense, - * and/or sell copies of the Software, and to permit persons to whom the - * Software is furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice (including the next - * paragraph) shall be included in all copies or substantial portions of the - * Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL - * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING - * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS - * IN THE SOFTWARE. - * - * Authors: - * Ben Widawsky <ben@bwidawsk.net> - * Michel Thierry <michel.thierry@intel.com> - * Thomas Daniel <thomas.daniel@intel.com> - * Oscar Mateo <oscar.mateo@intel.com> - * - */ - -/** - * DOC: Logical Rings, Logical Ring Contexts and Execlists - * - * Motivation: - * GEN8 brings an expansion of the HW contexts: "Logical Ring Contexts". - * These expanded contexts enable a number of new abilities, especially - * "Execlists" (also implemented in this file). - * - * One of the main differences with the legacy HW contexts is that logical - * ring contexts incorporate many more things to the context's state, like - * PDPs or ringbuffer control registers: - * - * The reason why PDPs are included in the context is straightforward: as - * PPGTTs (per-process GTTs) are actually per-context, having the PDPs - * contained there mean you don't need to do a ppgtt->switch_mm yourself, - * instead, the GPU will do it for you on the context switch. - * - * But, what about the ringbuffer control registers (head, tail, etc..)? - * shouldn't we just need a set of those per engine command streamer? This is - * where the name "Logical Rings" starts to make sense: by virtualizing the - * rings, the engine cs shifts to a new "ring buffer" with every context - * switch. When you want to submit a workload to the GPU you: A) choose your - * context, B) find its appropriate virtualized ring, C) write commands to it - * and then, finally, D) tell the GPU to switch to that context. - * - * Instead of the legacy MI_SET_CONTEXT, the way you tell the GPU to switch - * to a contexts is via a context execution list, ergo "Execlists". - * - * LRC implementation: - * Regarding the creation of contexts, we have: - * - * - One global default context. - * - One local default context for each opened fd. - * - One local extra context for each context create ioctl call. - * - * Now that ringbuffers belong per-context (and not per-engine, like before) - * and that contexts are uniquely tied to a given engine (and not reusable, - * like before) we need: - * - * - One ringbuffer per-engine inside each context. - * - One backing object per-engine inside each context. - * - * The global default context starts its life with these new objects fully - * allocated and populated. The local default context for each opened fd is - * more complex, because we don't know at creation time which engine is going - * to use them. To handle this, we have implemented a deferred creation of LR - * contexts: - * - * The local context starts its life as a hollow or blank holder, that only - * gets populated for a given engine once we receive an execbuffer. If later - * on we receive another execbuffer ioctl for the same context but a different - * engine, we allocate/populate a new ringbuffer and context backing object and - * so on. - * - * Finally, regarding local contexts created using the ioctl call: as they are - * only allowed with the render ring, we can allocate & populate them right - * away (no need to defer anything, at least for now). - * - * Execlists implementation: - * Execlists are the new method by which, on gen8+ hardware, workloads are - * submitted for execution (as opposed to the legacy, ringbuffer-based, method). - * This method works as follows: - * - * When a request is committed, its commands (the BB start and any leading or - * trailing commands, like the seqno breadcrumbs) are placed in the ringbuffer - * for the appropriate context. The tail pointer in the hardware context is not - * updated at this time, but instead, kept by the driver in the ringbuffer - * structure. A structure representing this request is added to a request queue - * for the appropriate engine: this structure contains a copy of the context's - * tail after the request was written to the ring buffer and a pointer to the - * context itself. - * - * If the engine's request queue was empty before the request was added, the - * queue is processed immediately. Otherwise the queue will be processed during - * a context switch interrupt. In any case, elements on the queue will get sent - * (in pairs) to the GPU's ExecLists Submit Port (ELSP, for short) with a - * globally unique 20-bits submission ID. - * - * When execution of a request completes, the GPU updates the context status - * buffer with a context complete event and generates a context switch interrupt. - * During the interrupt handling, the driver examines the events in the buffer: - * for each context complete event, if the announced ID matches that on the head - * of the request queue, then that request is retired and removed from the queue. - * - * After processing, if any requests were retired and the queue is not empty - * then a new execution list can be submitted. The two requests at the front of - * the queue are next to be submitted but since a context may not occur twice in - * an execution list, if subsequent requests have the same ID as the first then - * the two requests must be combined. This is done simply by discarding requests - * at the head of the queue until either only one requests is left (in which case - * we use a NULL second context) or the first two requests have unique IDs. - * - * By always executing the first two requests in the queue the driver ensures - * that the GPU is kept as busy as possible. In the case where a single context - * completes but a second context is still executing, the request for this second - * context will be at the head of the queue when we remove the first one. This - * request will then be resubmitted along with a new request for a different context, - * which will cause the hardware to continue executing the second request and queue - * the new request (the GPU detects the condition of a context getting preempted - * with the same context and optimizes the context switch flow by not doing - * preemption, but just sampling the new tail pointer). - * - */ -#include <linux/interrupt.h> - -#include <drm/drmP.h> -#include <drm/i915_drm.h> -#include "i915_drv.h" -#include "intel_mocs.h" - -#define RING_EXECLIST_QFULL (1 << 0x2) -#define RING_EXECLIST1_VALID (1 << 0x3) -#define RING_EXECLIST0_VALID (1 << 0x4) -#define RING_EXECLIST_ACTIVE_STATUS (3 << 0xE) -#define RING_EXECLIST1_ACTIVE (1 << 0x11) -#define RING_EXECLIST0_ACTIVE (1 << 0x12) - -#define GEN8_CTX_STATUS_IDLE_ACTIVE (1 << 0) -#define GEN8_CTX_STATUS_PREEMPTED (1 << 1) -#define GEN8_CTX_STATUS_ELEMENT_SWITCH (1 << 2) -#define GEN8_CTX_STATUS_ACTIVE_IDLE (1 << 3) -#define GEN8_CTX_STATUS_COMPLETE (1 << 4) -#define GEN8_CTX_STATUS_LITE_RESTORE (1 << 15) - -#define GEN8_CTX_STATUS_COMPLETED_MASK \ - (GEN8_CTX_STATUS_ACTIVE_IDLE | \ - GEN8_CTX_STATUS_PREEMPTED | \ - GEN8_CTX_STATUS_ELEMENT_SWITCH) - -#define CTX_LRI_HEADER_0 0x01 -#define CTX_CONTEXT_CONTROL 0x02 -#define CTX_RING_HEAD 0x04 -#define CTX_RING_TAIL 0x06 -#define CTX_RING_BUFFER_START 0x08 -#define CTX_RING_BUFFER_CONTROL 0x0a -#define CTX_BB_HEAD_U 0x0c -#define CTX_BB_HEAD_L 0x0e -#define CTX_BB_STATE 0x10 -#define CTX_SECOND_BB_HEAD_U 0x12 -#define CTX_SECOND_BB_HEAD_L 0x14 -#define CTX_SECOND_BB_STATE 0x16 -#define CTX_BB_PER_CTX_PTR 0x18 -#define CTX_RCS_INDIRECT_CTX 0x1a -#define CTX_RCS_INDIRECT_CTX_OFFSET 0x1c -#define CTX_LRI_HEADER_1 0x21 -#define CTX_CTX_TIMESTAMP 0x22 -#define CTX_PDP3_UDW 0x24 -#define CTX_PDP3_LDW 0x26 -#define CTX_PDP2_UDW 0x28 -#define CTX_PDP2_LDW 0x2a -#define CTX_PDP1_UDW 0x2c -#define CTX_PDP1_LDW 0x2e -#define CTX_PDP0_UDW 0x30 -#define CTX_PDP0_LDW 0x32 -#define CTX_LRI_HEADER_2 0x41 -#define CTX_R_PWR_CLK_STATE 0x42 -#define CTX_GPGPU_CSR_BASE_ADDRESS 0x44 - -#define CTX_REG(reg_state, pos, reg, val) do { \ - (reg_state)[(pos)+0] = i915_mmio_reg_offset(reg); \ - (reg_state)[(pos)+1] = (val); \ -} while (0) - -#define ASSIGN_CTX_PDP(ppgtt, reg_state, n) do { \ - const u64 _addr = i915_page_dir_dma_addr((ppgtt), (n)); \ - reg_state[CTX_PDP ## n ## _UDW+1] = upper_32_bits(_addr); \ - reg_state[CTX_PDP ## n ## _LDW+1] = lower_32_bits(_addr); \ -} while (0) - -#define ASSIGN_CTX_PML4(ppgtt, reg_state) do { \ - reg_state[CTX_PDP0_UDW + 1] = upper_32_bits(px_dma(&ppgtt->pml4)); \ - reg_state[CTX_PDP0_LDW + 1] = lower_32_bits(px_dma(&ppgtt->pml4)); \ -} while (0) - -#define GEN8_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT 0x17 -#define GEN9_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT 0x26 -#define GEN10_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT 0x19 - -/* Typical size of the average request (2 pipecontrols and a MI_BB) */ -#define EXECLISTS_REQUEST_SIZE 64 /* bytes */ - -#define WA_TAIL_DWORDS 2 - -static int execlists_context_deferred_alloc(struct i915_gem_context *ctx, - struct intel_engine_cs *engine); -static void execlists_init_reg_state(u32 *reg_state, - struct i915_gem_context *ctx, - struct intel_engine_cs *engine, - struct intel_ring *ring); - -/** - * intel_sanitize_enable_execlists() - sanitize i915.enable_execlists - * @dev_priv: i915 device private - * @enable_execlists: value of i915.enable_execlists module parameter. - * - * Only certain platforms support Execlists (the prerequisites being - * support for Logical Ring Contexts and Aliasing PPGTT or better). - * - * Return: 1 if Execlists is supported and has to be enabled. - */ -int intel_sanitize_enable_execlists(struct drm_i915_private *dev_priv, int enable_execlists) -{ - /* On platforms with execlist available, vGPU will only - * support execlist mode, no ring buffer mode. - */ - if (HAS_LOGICAL_RING_CONTEXTS(dev_priv) && intel_vgpu_active(dev_priv)) - return 1; - - if (INTEL_GEN(dev_priv) >= 9) - return 1; - - if (enable_execlists == 0) - return 0; - - if (HAS_LOGICAL_RING_CONTEXTS(dev_priv) && - USES_PPGTT(dev_priv) && - i915.use_mmio_flip >= 0) - return 1; - - return 0; -} - -/** - * intel_lr_context_descriptor_update() - calculate & cache the descriptor - * descriptor for a pinned context - * @ctx: Context to work on - * @engine: Engine the descriptor will be used with - * - * The context descriptor encodes various attributes of a context, - * including its GTT address and some flags. Because it's fairly - * expensive to calculate, we'll just do it once and cache the result, - * which remains valid until the context is unpinned. - * - * This is what a descriptor looks like, from LSB to MSB:: - * - * bits 0-11: flags, GEN8_CTX_* (cached in ctx->desc_template) - * bits 12-31: LRCA, GTT address of (the HWSP of) this context - * bits 32-52: ctx ID, a globally unique tag - * bits 53-54: mbz, reserved for use by hardware - * bits 55-63: group ID, currently unused and set to 0 - */ -static void -intel_lr_context_descriptor_update(struct i915_gem_context *ctx, - struct intel_engine_cs *engine) -{ - struct intel_context *ce = &ctx->engine[engine->id]; - u64 desc; - - BUILD_BUG_ON(MAX_CONTEXT_HW_ID > (1<<GEN8_CTX_ID_WIDTH)); - - desc = ctx->desc_template; /* bits 0-11 */ - desc |= i915_ggtt_offset(ce->state) + LRC_PPHWSP_PN * PAGE_SIZE; - /* bits 12-31 */ - desc |= (u64)ctx->hw_id << GEN8_CTX_ID_SHIFT; /* bits 32-52 */ - - ce->lrc_desc = desc; -} - -uint64_t intel_lr_context_descriptor(struct i915_gem_context *ctx, - struct intel_engine_cs *engine) -{ - return ctx->engine[engine->id].lrc_desc; -} - -static inline void -execlists_context_status_change(struct drm_i915_gem_request *rq, - unsigned long status) -{ - /* - * Only used when GVT-g is enabled now. When GVT-g is disabled, - * The compiler should eliminate this function as dead-code. - */ - if (!IS_ENABLED(CONFIG_DRM_I915_GVT)) - return; - - atomic_notifier_call_chain(&rq->engine->context_status_notifier, - status, rq); -} - -static void -execlists_update_context_pdps(struct i915_hw_ppgtt *ppgtt, u32 *reg_state) -{ - ASSIGN_CTX_PDP(ppgtt, reg_state, 3); - ASSIGN_CTX_PDP(ppgtt, reg_state, 2); - ASSIGN_CTX_PDP(ppgtt, reg_state, 1); - ASSIGN_CTX_PDP(ppgtt, reg_state, 0); -} - -static u64 execlists_update_context(struct drm_i915_gem_request *rq) -{ - struct intel_context *ce = &rq->ctx->engine[rq->engine->id]; - struct i915_hw_ppgtt *ppgtt = - rq->ctx->ppgtt ?: rq->i915->mm.aliasing_ppgtt; - u32 *reg_state = ce->lrc_reg_state; - - reg_state[CTX_RING_TAIL+1] = intel_ring_set_tail(rq->ring, rq->tail); - - /* True 32b PPGTT with dynamic page allocation: update PDP - * registers and point the unallocated PDPs to scratch page. - * PML4 is allocated during ppgtt init, so this is not needed - * in 48-bit mode. - */ - if (ppgtt && !i915_vm_is_48bit(&ppgtt->base)) - execlists_update_context_pdps(ppgtt, reg_state); - - return ce->lrc_desc; -} - -static void execlists_submit_ports(struct intel_engine_cs *engine) -{ - struct execlist_port *port = engine->execlist_port; - u32 __iomem *elsp = - engine->i915->regs + i915_mmio_reg_offset(RING_ELSP(engine)); - unsigned int n; - - for (n = ARRAY_SIZE(engine->execlist_port); n--; ) { - struct drm_i915_gem_request *rq; - unsigned int count; - u64 desc; - - rq = port_unpack(&port[n], &count); - if (rq) { - GEM_BUG_ON(count > !n); - if (!count++) - execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_IN); - port_set(&port[n], port_pack(rq, count)); - desc = execlists_update_context(rq); - GEM_DEBUG_EXEC(port[n].context_id = upper_32_bits(desc)); - } else { - GEM_BUG_ON(!n); - desc = 0; - } - - writel(upper_32_bits(desc), elsp); - writel(lower_32_bits(desc), elsp); - } -} - -static bool ctx_single_port_submission(const struct i915_gem_context *ctx) -{ - return (IS_ENABLED(CONFIG_DRM_I915_GVT) && - i915_gem_context_force_single_submission(ctx)); -} - -static bool can_merge_ctx(const struct i915_gem_context *prev, - const struct i915_gem_context *next) -{ - if (prev != next) - return false; - - if (ctx_single_port_submission(prev)) - return false; - - return true; -} - -static void port_assign(struct execlist_port *port, - struct drm_i915_gem_request *rq) -{ - GEM_BUG_ON(rq == port_request(port)); - - if (port_isset(port)) - i915_gem_request_put(port_request(port)); - - port_set(port, port_pack(i915_gem_request_get(rq), port_count(port))); -} - -static void execlists_dequeue(struct intel_engine_cs *engine) -{ - struct drm_i915_gem_request *last; - struct execlist_port *port = engine->execlist_port; - struct rb_node *rb; - bool submit = false; - - last = port_request(port); - if (last) - /* WaIdleLiteRestore:bdw,skl - * Apply the wa NOOPs to prevent ring:HEAD == req:TAIL - * as we resubmit the request. See gen8_emit_breadcrumb() - * for where we prepare the padding after the end of the - * request. - */ - last->tail = last->wa_tail; - - GEM_BUG_ON(port_isset(&port[1])); - - /* Hardware submission is through 2 ports. Conceptually each port - * has a (RING_START, RING_HEAD, RING_TAIL) tuple. RING_START is - * static for a context, and unique to each, so we only execute - * requests belonging to a single context from each ring. RING_HEAD - * is maintained by the CS in the context image, it marks the place - * where it got up to last time, and through RING_TAIL we tell the CS - * where we want to execute up to this time. - * - * In this list the requests are in order of execution. Consecutive - * requests from the same context are adjacent in the ringbuffer. We - * can combine these requests into a single RING_TAIL update: - * - * RING_HEAD...req1...req2 - * ^- RING_TAIL - * since to execute req2 the CS must first execute req1. - * - * Our goal then is to point each port to the end of a consecutive - * sequence of requests as being the most optimal (fewest wake ups - * and context switches) submission. - */ - - spin_lock_irq(&engine->timeline->lock); - rb = engine->execlist_first; - GEM_BUG_ON(rb_first(&engine->execlist_queue) != rb); - while (rb) { - struct i915_priolist *p = rb_entry(rb, typeof(*p), node); - struct drm_i915_gem_request *rq, *rn; - - list_for_each_entry_safe(rq, rn, &p->requests, priotree.link) { - /* - * Can we combine this request with the current port? - * It has to be the same context/ringbuffer and not - * have any exceptions (e.g. GVT saying never to - * combine contexts). - * - * If we can combine the requests, we can execute both - * by updating the RING_TAIL to point to the end of the - * second request, and so we never need to tell the - * hardware about the first. - */ - if (last && !can_merge_ctx(rq->ctx, last->ctx)) { - /* - * If we are on the second port and cannot - * combine this request with the last, then we - * are done. - */ - if (port != engine->execlist_port) { - __list_del_many(&p->requests, - &rq->priotree.link); - goto done; - } - - /* - * If GVT overrides us we only ever submit - * port[0], leaving port[1] empty. Note that we - * also have to be careful that we don't queue - * the same context (even though a different - * request) to the second port. - */ - if (ctx_single_port_submission(last->ctx) || - ctx_single_port_submission(rq->ctx)) { - __list_del_many(&p->requests, - &rq->priotree.link); - goto done; - } - - GEM_BUG_ON(last->ctx == rq->ctx); - - if (submit) - port_assign(port, last); - port++; - } - - INIT_LIST_HEAD(&rq->priotree.link); - rq->priotree.priority = INT_MAX; - - __i915_gem_request_submit(rq); - trace_i915_gem_request_in(rq, port_index(port, engine)); - last = rq; - submit = true; - } - - rb = rb_next(rb); - rb_erase(&p->node, &engine->execlist_queue); - INIT_LIST_HEAD(&p->requests); - if (p->priority != I915_PRIORITY_NORMAL) - kmem_cache_free(engine->i915->priorities, p); - } -done: - engine->execlist_first = rb; - if (submit) - port_assign(port, last); - spin_unlock_irq(&engine->timeline->lock); - - if (submit) - execlists_submit_ports(engine); -} - -static bool execlists_elsp_ready(const struct intel_engine_cs *engine) -{ - const struct execlist_port *port = engine->execlist_port; - - return port_count(&port[0]) + port_count(&port[1]) < 2; -} - -/* - * Check the unread Context Status Buffers and manage the submission of new - * contexts to the ELSP accordingly. - */ -static void intel_lrc_irq_handler(unsigned long data) -{ - struct intel_engine_cs *engine = (struct intel_engine_cs *)data; - struct execlist_port *port = engine->execlist_port; - struct drm_i915_private *dev_priv = engine->i915; - - /* We can skip acquiring intel_runtime_pm_get() here as it was taken - * on our behalf by the request (see i915_gem_mark_busy()) and it will - * not be relinquished until the device is idle (see - * i915_gem_idle_work_handler()). As a precaution, we make sure - * that all ELSP are drained i.e. we have processed the CSB, - * before allowing ourselves to idle and calling intel_runtime_pm_put(). - */ - GEM_BUG_ON(!dev_priv->gt.awake); - - intel_uncore_forcewake_get(dev_priv, engine->fw_domains); - - /* Prefer doing test_and_clear_bit() as a two stage operation to avoid - * imposing the cost of a locked atomic transaction when submitting a - * new request (outside of the context-switch interrupt). - */ - while (test_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted)) { - u32 __iomem *csb_mmio = - dev_priv->regs + i915_mmio_reg_offset(RING_CONTEXT_STATUS_PTR(engine)); - u32 __iomem *buf = - dev_priv->regs + i915_mmio_reg_offset(RING_CONTEXT_STATUS_BUF_LO(engine, 0)); - unsigned int head, tail; - - /* The write will be ordered by the uncached read (itself - * a memory barrier), so we do not need another in the form - * of a locked instruction. The race between the interrupt - * handler and the split test/clear is harmless as we order - * our clear before the CSB read. If the interrupt arrived - * first between the test and the clear, we read the updated - * CSB and clear the bit. If the interrupt arrives as we read - * the CSB or later (i.e. after we had cleared the bit) the bit - * is set and we do a new loop. - */ - __clear_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted); - head = readl(csb_mmio); - tail = GEN8_CSB_WRITE_PTR(head); - head = GEN8_CSB_READ_PTR(head); - while (head != tail) { - struct drm_i915_gem_request *rq; - unsigned int status; - unsigned int count; - - if (++head == GEN8_CSB_ENTRIES) - head = 0; - - /* We are flying near dragons again. - * - * We hold a reference to the request in execlist_port[] - * but no more than that. We are operating in softirq - * context and so cannot hold any mutex or sleep. That - * prevents us stopping the requests we are processing - * in port[] from being retired simultaneously (the - * breadcrumb will be complete before we see the - * context-switch). As we only hold the reference to the - * request, any pointer chasing underneath the request - * is subject to a potential use-after-free. Thus we - * store all of the bookkeeping within port[] as - * required, and avoid using unguarded pointers beneath - * request itself. The same applies to the atomic - * status notifier. - */ - - status = readl(buf + 2 * head); - if (!(status & GEN8_CTX_STATUS_COMPLETED_MASK)) - continue; - - /* Check the context/desc id for this event matches */ - GEM_DEBUG_BUG_ON(readl(buf + 2 * head + 1) != - port->context_id); - - rq = port_unpack(port, &count); - GEM_BUG_ON(count == 0); - if (--count == 0) { - GEM_BUG_ON(status & GEN8_CTX_STATUS_PREEMPTED); - GEM_BUG_ON(!i915_gem_request_completed(rq)); - execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_OUT); - - trace_i915_gem_request_out(rq); - i915_gem_request_put(rq); - - port[0] = port[1]; - memset(&port[1], 0, sizeof(port[1])); - } else { - port_set(port, port_pack(rq, count)); - } - - /* After the final element, the hw should be idle */ - GEM_BUG_ON(port_count(port) == 0 && - !(status & GEN8_CTX_STATUS_ACTIVE_IDLE)); - } - - writel(_MASKED_FIELD(GEN8_CSB_READ_PTR_MASK, head << 8), - csb_mmio); - } - - if (execlists_elsp_ready(engine)) - execlists_dequeue(engine); - - intel_uncore_forcewake_put(dev_priv, engine->fw_domains); -} - -static bool -insert_request(struct intel_engine_cs *engine, - struct i915_priotree *pt, - int prio) -{ - struct i915_priolist *p; - struct rb_node **parent, *rb; - bool first = true; - - if (unlikely(engine->no_priolist)) - prio = I915_PRIORITY_NORMAL; - -find_priolist: - /* most positive priority is scheduled first, equal priorities fifo */ - rb = NULL; - parent = &engine->execlist_queue.rb_node; - while (*parent) { - rb = *parent; - p = rb_entry(rb, typeof(*p), node); - if (prio > p->priority) { - parent = &rb->rb_left; - } else if (prio < p->priority) { - parent = &rb->rb_right; - first = false; - } else { - list_add_tail(&pt->link, &p->requests); - return false; - } - } - - if (prio == I915_PRIORITY_NORMAL) { - p = &engine->default_priolist; - } else { - p = kmem_cache_alloc(engine->i915->priorities, GFP_ATOMIC); - /* Convert an allocation failure to a priority bump */ - if (unlikely(!p)) { - prio = I915_PRIORITY_NORMAL; /* recurses just once */ - - /* To maintain ordering with all rendering, after an - * allocation failure we have to disable all scheduling. - * Requests will then be executed in fifo, and schedule - * will ensure that dependencies are emitted in fifo. - * There will be still some reordering with existing - * requests, so if userspace lied about their - * dependencies that reordering may be visible. - */ - engine->no_priolist = true; - goto find_priolist; - } - } - - p->priority = prio; - rb_link_node(&p->node, rb, parent); - rb_insert_color(&p->node, &engine->execlist_queue); - - INIT_LIST_HEAD(&p->requests); - list_add_tail(&pt->link, &p->requests); - - if (first) - engine->execlist_first = &p->node; - - return first; -} - -static void execlists_submit_request(struct drm_i915_gem_request *request) -{ - struct intel_engine_cs *engine = request->engine; - unsigned long flags; - - /* Will be called from irq-context when using foreign fences. */ - spin_lock_irqsave(&engine->timeline->lock, flags); - - if (insert_request(engine, - &request->priotree, - request->priotree.priority)) { - if (execlists_elsp_ready(engine)) - tasklet_hi_schedule(&engine->irq_tasklet); - } - - GEM_BUG_ON(!engine->execlist_first); - GEM_BUG_ON(list_empty(&request->priotree.link)); - - spin_unlock_irqrestore(&engine->timeline->lock, flags); -} - -static struct intel_engine_cs * -pt_lock_engine(struct i915_priotree *pt, struct intel_engine_cs *locked) -{ - struct intel_engine_cs *engine = - container_of(pt, struct drm_i915_gem_request, priotree)->engine; - - GEM_BUG_ON(!locked); - - if (engine != locked) { - spin_unlock(&locked->timeline->lock); - spin_lock(&engine->timeline->lock); - } - - return engine; -} - -static void execlists_schedule(struct drm_i915_gem_request *request, int prio) -{ - struct intel_engine_cs *engine; - struct i915_dependency *dep, *p; - struct i915_dependency stack; - LIST_HEAD(dfs); - - if (prio <= READ_ONCE(request->priotree.priority)) - return; - - /* Need BKL in order to use the temporary link inside i915_dependency */ - lockdep_assert_held(&request->i915->drm.struct_mutex); - - stack.signaler = &request->priotree; - list_add(&stack.dfs_link, &dfs); - - /* Recursively bump all dependent priorities to match the new request. - * - * A naive approach would be to use recursion: - * static void update_priorities(struct i915_priotree *pt, prio) { - * list_for_each_entry(dep, &pt->signalers_list, signal_link) - * update_priorities(dep->signal, prio) - * insert_request(pt); - * } - * but that may have unlimited recursion depth and so runs a very - * real risk of overunning the kernel stack. Instead, we build - * a flat list of all dependencies starting with the current request. - * As we walk the list of dependencies, we add all of its dependencies - * to the end of the list (this may include an already visited - * request) and continue to walk onwards onto the new dependencies. The - * end result is a topological list of requests in reverse order, the - * last element in the list is the request we must execute first. - */ - list_for_each_entry_safe(dep, p, &dfs, dfs_link) { - struct i915_priotree *pt = dep->signaler; - - /* Within an engine, there can be no cycle, but we may - * refer to the same dependency chain multiple times - * (redundant dependencies are not eliminated) and across - * engines. - */ - list_for_each_entry(p, &pt->signalers_list, signal_link) { - GEM_BUG_ON(p->signaler->priority < pt->priority); - if (prio > READ_ONCE(p->signaler->priority)) - list_move_tail(&p->dfs_link, &dfs); - } - - list_safe_reset_next(dep, p, dfs_link); - } - - /* If we didn't need to bump any existing priorities, and we haven't - * yet submitted this request (i.e. there is no potential race with - * execlists_submit_request()), we can set our own priority and skip - * acquiring the engine locks. - */ - if (request->priotree.priority == INT_MIN) { - GEM_BUG_ON(!list_empty(&request->priotree.link)); - request->priotree.priority = prio; - if (stack.dfs_link.next == stack.dfs_link.prev) - return; - __list_del_entry(&stack.dfs_link); - } - - engine = request->engine; - spin_lock_irq(&engine->timeline->lock); - - /* Fifo and depth-first replacement ensure our deps execute before us */ - list_for_each_entry_safe_reverse(dep, p, &dfs, dfs_link) { - struct i915_priotree *pt = dep->signaler; - - INIT_LIST_HEAD(&dep->dfs_link); - - engine = pt_lock_engine(pt, engine); - - if (prio <= pt->priority) - continue; - - pt->priority = prio; - if (!list_empty(&pt->link)) { - __list_del_entry(&pt->link); - insert_request(engine, pt, prio); - } - } - - spin_unlock_irq(&engine->timeline->lock); - - /* XXX Do we need to preempt to make room for us and our deps? */ -} - -static struct intel_ring * -execlists_context_pin(struct intel_engine_cs *engine, - struct i915_gem_context *ctx) -{ - struct intel_context *ce = &ctx->engine[engine->id]; - unsigned int flags; - void *vaddr; - int ret; - - lockdep_assert_held(&ctx->i915->drm.struct_mutex); - - if (likely(ce->pin_count++)) - goto out; - GEM_BUG_ON(!ce->pin_count); /* no overflow please! */ - - if (!ce->state) { - ret = execlists_context_deferred_alloc(ctx, engine); - if (ret) - goto err; - } - GEM_BUG_ON(!ce->state); - - flags = PIN_GLOBAL | PIN_HIGH; - if (ctx->ggtt_offset_bias) - flags |= PIN_OFFSET_BIAS | ctx->ggtt_offset_bias; - - ret = i915_vma_pin(ce->state, 0, GEN8_LR_CONTEXT_ALIGN, flags); - if (ret) - goto err; - - vaddr = i915_gem_object_pin_map(ce->state->obj, I915_MAP_WB); - if (IS_ERR(vaddr)) { - ret = PTR_ERR(vaddr); - goto unpin_vma; - } - - ret = intel_ring_pin(ce->ring, ctx->i915, ctx->ggtt_offset_bias); - if (ret) - goto unpin_map; - - intel_lr_context_descriptor_update(ctx, engine); - - ce->lrc_reg_state = vaddr + LRC_STATE_PN * PAGE_SIZE; - ce->lrc_reg_state[CTX_RING_BUFFER_START+1] = - i915_ggtt_offset(ce->ring->vma); - - ce->state->obj->mm.dirty = true; - - i915_gem_context_get(ctx); -out: - return ce->ring; - -unpin_map: - i915_gem_object_unpin_map(ce->state->obj); -unpin_vma: - __i915_vma_unpin(ce->state); -err: - ce->pin_count = 0; - return ERR_PTR(ret); -} - -static void execlists_context_unpin(struct intel_engine_cs *engine, - struct i915_gem_context *ctx) -{ - struct intel_context *ce = &ctx->engine[engine->id]; - - lockdep_assert_held(&ctx->i915->drm.struct_mutex); - GEM_BUG_ON(ce->pin_count == 0); - - if (--ce->pin_count) - return; - - intel_ring_unpin(ce->ring); - - i915_gem_object_unpin_map(ce->state->obj); - i915_vma_unpin(ce->state); - - i915_gem_context_put(ctx); -} - -static int execlists_request_alloc(struct drm_i915_gem_request *request) -{ - struct intel_engine_cs *engine = request->engine; - struct intel_context *ce = &request->ctx->engine[engine->id]; - u32 *cs; - int ret; - - GEM_BUG_ON(!ce->pin_count); - - /* Flush enough space to reduce the likelihood of waiting after - * we start building the request - in which case we will just - * have to repeat work. - */ - request->reserved_space += EXECLISTS_REQUEST_SIZE; - - if (i915.enable_guc_submission) { - /* - * Check that the GuC has space for the request before - * going any further, as the i915_add_request() call - * later on mustn't fail ... - */ - ret = i915_guc_wq_reserve(request); - if (ret) - goto err; - } - - cs = intel_ring_begin(request, 0); - if (IS_ERR(cs)) { - ret = PTR_ERR(cs); - goto err_unreserve; - } - - if (!ce->initialised) { - ret = engine->init_context(request); - if (ret) - goto err_unreserve; - - ce->initialised = true; - } - - /* Note that after this point, we have committed to using - * this request as it is being used to both track the - * state of engine initialisation and liveness of the - * golden renderstate above. Think twice before you try - * to cancel/unwind this request now. - */ - - request->reserved_space -= EXECLISTS_REQUEST_SIZE; - return 0; - -err_unreserve: - if (i915.enable_guc_submission) - i915_guc_wq_unreserve(request); -err: - return ret; -} - -/* - * In this WA we need to set GEN8_L3SQCREG4[21:21] and reset it after - * PIPE_CONTROL instruction. This is required for the flush to happen correctly - * but there is a slight complication as this is applied in WA batch where the - * values are only initialized once so we cannot take register value at the - * beginning and reuse it further; hence we save its value to memory, upload a - * constant value with bit21 set and then we restore it back with the saved value. - * To simplify the WA, a constant value is formed by using the default value - * of this register. This shouldn't be a problem because we are only modifying - * it for a short period and this batch in non-premptible. We can ofcourse - * use additional instructions that read the actual value of the register - * at that time and set our bit of interest but it makes the WA complicated. - * - * This WA is also required for Gen9 so extracting as a function avoids - * code duplication. - */ -static u32 * -gen8_emit_flush_coherentl3_wa(struct intel_engine_cs *engine, u32 *batch) -{ - *batch++ = MI_STORE_REGISTER_MEM_GEN8 | MI_SRM_LRM_GLOBAL_GTT; - *batch++ = i915_mmio_reg_offset(GEN8_L3SQCREG4); - *batch++ = i915_ggtt_offset(engine->scratch) + 256; - *batch++ = 0; - - *batch++ = MI_LOAD_REGISTER_IMM(1); - *batch++ = i915_mmio_reg_offset(GEN8_L3SQCREG4); - *batch++ = 0x40400000 | GEN8_LQSC_FLUSH_COHERENT_LINES; - - batch = gen8_emit_pipe_control(batch, - PIPE_CONTROL_CS_STALL | - PIPE_CONTROL_DC_FLUSH_ENABLE, - 0); - - *batch++ = MI_LOAD_REGISTER_MEM_GEN8 | MI_SRM_LRM_GLOBAL_GTT; - *batch++ = i915_mmio_reg_offset(GEN8_L3SQCREG4); - *batch++ = i915_ggtt_offset(engine->scratch) + 256; - *batch++ = 0; - - return batch; -} - -/* - * Typically we only have one indirect_ctx and per_ctx batch buffer which are - * initialized at the beginning and shared across all contexts but this field - * helps us to have multiple batches at different offsets and select them based - * on a criteria. At the moment this batch always start at the beginning of the page - * and at this point we don't have multiple wa_ctx batch buffers. - * - * The number of WA applied are not known at the beginning; we use this field - * to return the no of DWORDS written. - * - * It is to be noted that this batch does not contain MI_BATCH_BUFFER_END - * so it adds NOOPs as padding to make it cacheline aligned. - * MI_BATCH_BUFFER_END will be added to perctx batch and both of them together - * makes a complete batch buffer. - */ -static u32 *gen8_init_indirectctx_bb(struct intel_engine_cs *engine, u32 *batch) -{ - /* WaDisableCtxRestoreArbitration:bdw,chv */ - *batch++ = MI_ARB_ON_OFF | MI_ARB_DISABLE; - - /* WaFlushCoherentL3CacheLinesAtContextSwitch:bdw */ - if (IS_BROADWELL(engine->i915)) - batch = gen8_emit_flush_coherentl3_wa(engine, batch); - - /* WaClearSlmSpaceAtContextSwitch:bdw,chv */ - /* Actual scratch location is at 128 bytes offset */ - batch = gen8_emit_pipe_control(batch, - PIPE_CONTROL_FLUSH_L3 | - PIPE_CONTROL_GLOBAL_GTT_IVB | - PIPE_CONTROL_CS_STALL | - PIPE_CONTROL_QW_WRITE, - i915_ggtt_offset(engine->scratch) + - 2 * CACHELINE_BYTES); - - /* Pad to end of cacheline */ - while ((unsigned long)batch % CACHELINE_BYTES) - *batch++ = MI_NOOP; - - /* - * MI_BATCH_BUFFER_END is not required in Indirect ctx BB because - * execution depends on the length specified in terms of cache lines - * in the register CTX_RCS_INDIRECT_CTX - */ - - return batch; -} - -/* - * This batch is started immediately after indirect_ctx batch. Since we ensure - * that indirect_ctx ends on a cacheline this batch is aligned automatically. - * - * The number of DWORDS written are returned using this field. - * - * This batch is terminated with MI_BATCH_BUFFER_END and so we need not add padding - * to align it with cacheline as padding after MI_BATCH_BUFFER_END is redundant. - */ -static u32 *gen8_init_perctx_bb(struct intel_engine_cs *engine, u32 *batch) -{ - /* WaDisableCtxRestoreArbitration:bdw,chv */ - *batch++ = MI_ARB_ON_OFF | MI_ARB_ENABLE; - *batch++ = MI_BATCH_BUFFER_END; - - return batch; -} - -static u32 *gen9_init_indirectctx_bb(struct intel_engine_cs *engine, u32 *batch) -{ - /* WaFlushCoherentL3CacheLinesAtContextSwitch:skl,bxt,glk */ - batch = gen8_emit_flush_coherentl3_wa(engine, batch); - - /* WaDisableGatherAtSetShaderCommonSlice:skl,bxt,kbl,glk */ - *batch++ = MI_LOAD_REGISTER_IMM(1); - *batch++ = i915_mmio_reg_offset(COMMON_SLICE_CHICKEN2); - *batch++ = _MASKED_BIT_DISABLE( - GEN9_DISABLE_GATHER_AT_SET_SHADER_COMMON_SLICE); - *batch++ = MI_NOOP; - - /* WaClearSlmSpaceAtContextSwitch:kbl */ - /* Actual scratch location is at 128 bytes offset */ - if (IS_KBL_REVID(engine->i915, 0, KBL_REVID_A0)) { - batch = gen8_emit_pipe_control(batch, - PIPE_CONTROL_FLUSH_L3 | - PIPE_CONTROL_GLOBAL_GTT_IVB | - PIPE_CONTROL_CS_STALL | - PIPE_CONTROL_QW_WRITE, - i915_ggtt_offset(engine->scratch) - + 2 * CACHELINE_BYTES); - } - - /* WaMediaPoolStateCmdInWABB:bxt,glk */ - if (HAS_POOLED_EU(engine->i915)) { - /* - * EU pool configuration is setup along with golden context - * during context initialization. This value depends on - * device type (2x6 or 3x6) and needs to be updated based - * on which subslice is disabled especially for 2x6 - * devices, however it is safe to load default - * configuration of 3x6 device instead of masking off - * corresponding bits because HW ignores bits of a disabled - * subslice and drops down to appropriate config. Please - * see render_state_setup() in i915_gem_render_state.c for - * possible configurations, to avoid duplication they are - * not shown here again. - */ - *batch++ = GEN9_MEDIA_POOL_STATE; - *batch++ = GEN9_MEDIA_POOL_ENABLE; - *batch++ = 0x00777000; - *batch++ = 0; - *batch++ = 0; - *batch++ = 0; - } - - /* Pad to end of cacheline */ - while ((unsigned long)batch % CACHELINE_BYTES) - *batch++ = MI_NOOP; - - return batch; -} - -static u32 *gen9_init_perctx_bb(struct intel_engine_cs *engine, u32 *batch) -{ - *batch++ = MI_BATCH_BUFFER_END; - - return batch; -} - -#define CTX_WA_BB_OBJ_SIZE (PAGE_SIZE) - -static int lrc_setup_wa_ctx(struct intel_engine_cs *engine) -{ - struct drm_i915_gem_object *obj; - struct i915_vma *vma; - int err; - - obj = i915_gem_object_create(engine->i915, CTX_WA_BB_OBJ_SIZE); - if (IS_ERR(obj)) - return PTR_ERR(obj); - - vma = i915_vma_instance(obj, &engine->i915->ggtt.base, NULL); - if (IS_ERR(vma)) { - err = PTR_ERR(vma); - goto err; - } - - err = i915_vma_pin(vma, 0, PAGE_SIZE, PIN_GLOBAL | PIN_HIGH); - if (err) - goto err; - - engine->wa_ctx.vma = vma; - return 0; - -err: - i915_gem_object_put(obj); - return err; -} - -static void lrc_destroy_wa_ctx(struct intel_engine_cs *engine) -{ - i915_vma_unpin_and_release(&engine->wa_ctx.vma); -} - -typedef u32 *(*wa_bb_func_t)(struct intel_engine_cs *engine, u32 *batch); - -static int intel_init_workaround_bb(struct intel_engine_cs *engine) -{ - struct i915_ctx_workarounds *wa_ctx = &engine->wa_ctx; - struct i915_wa_ctx_bb *wa_bb[2] = { &wa_ctx->indirect_ctx, - &wa_ctx->per_ctx }; - wa_bb_func_t wa_bb_fn[2]; - struct page *page; - void *batch, *batch_ptr; - unsigned int i; - int ret; - - if (WARN_ON(engine->id != RCS || !engine->scratch)) - return -EINVAL; - - switch (INTEL_GEN(engine->i915)) { - case 9: - wa_bb_fn[0] = gen9_init_indirectctx_bb; - wa_bb_fn[1] = gen9_init_perctx_bb; - break; - case 8: - wa_bb_fn[0] = gen8_init_indirectctx_bb; - wa_bb_fn[1] = gen8_init_perctx_bb; - break; - default: - MISSING_CASE(INTEL_GEN(engine->i915)); - return 0; - } - - ret = lrc_setup_wa_ctx(engine); - if (ret) { - DRM_DEBUG_DRIVER("Failed to setup context WA page: %d\n", ret); - return ret; - } - - page = i915_gem_object_get_dirty_page(wa_ctx->vma->obj, 0); - batch = batch_ptr = kmap_atomic(page); - - /* - * Emit the two workaround batch buffers, recording the offset from the - * start of the workaround batch buffer object for each and their - * respective sizes. - */ - for (i = 0; i < ARRAY_SIZE(wa_bb_fn); i++) { - wa_bb[i]->offset = batch_ptr - batch; - if (WARN_ON(!IS_ALIGNED(wa_bb[i]->offset, CACHELINE_BYTES))) { - ret = -EINVAL; - break; - } - batch_ptr = wa_bb_fn[i](engine, batch_ptr); - wa_bb[i]->size = batch_ptr - (batch + wa_bb[i]->offset); - } - - BUG_ON(batch_ptr - batch > CTX_WA_BB_OBJ_SIZE); - - kunmap_atomic(batch); - if (ret) - lrc_destroy_wa_ctx(engine); - - return ret; -} - -static int gen8_init_common_ring(struct intel_engine_cs *engine) -{ - struct drm_i915_private *dev_priv = engine->i915; - struct execlist_port *port = engine->execlist_port; - unsigned int n; - bool submit; - int ret; - - ret = intel_mocs_init_engine(engine); - if (ret) - return ret; - - intel_engine_reset_breadcrumbs(engine); - intel_engine_init_hangcheck(engine); - - I915_WRITE(RING_HWSTAM(engine->mmio_base), 0xffffffff); - I915_WRITE(RING_MODE_GEN7(engine), - _MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE)); - I915_WRITE(RING_HWS_PGA(engine->mmio_base), - engine->status_page.ggtt_offset); - POSTING_READ(RING_HWS_PGA(engine->mmio_base)); - - DRM_DEBUG_DRIVER("Execlists enabled for %s\n", engine->name); - - /* After a GPU reset, we may have requests to replay */ - clear_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted); - - submit = false; - for (n = 0; n < ARRAY_SIZE(engine->execlist_port); n++) { - if (!port_isset(&port[n])) - break; - - DRM_DEBUG_DRIVER("Restarting %s:%d from 0x%x\n", - engine->name, n, - port_request(&port[n])->global_seqno); - - /* Discard the current inflight count */ - port_set(&port[n], port_request(&port[n])); - submit = true; - } - - if (submit && !i915.enable_guc_submission) - execlists_submit_ports(engine); - - return 0; -} - -static int gen8_init_render_ring(struct intel_engine_cs *engine) -{ - struct drm_i915_private *dev_priv = engine->i915; - int ret; - - ret = gen8_init_common_ring(engine); - if (ret) - return ret; - - /* We need to disable the AsyncFlip performance optimisations in order - * to use MI_WAIT_FOR_EVENT within the CS. It should already be - * programmed to '1' on all products. - * - * WaDisableAsyncFlipPerfMode:snb,ivb,hsw,vlv,bdw,chv - */ - I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE)); - - I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING)); - - return init_workarounds_ring(engine); -} - -static int gen9_init_render_ring(struct intel_engine_cs *engine) -{ - int ret; - - ret = gen8_init_common_ring(engine); - if (ret) - return ret; - - return init_workarounds_ring(engine); -} - -static void reset_common_ring(struct intel_engine_cs *engine, - struct drm_i915_gem_request *request) -{ - struct execlist_port *port = engine->execlist_port; - struct intel_context *ce; - - /* If the request was innocent, we leave the request in the ELSP - * and will try to replay it on restarting. The context image may - * have been corrupted by the reset, in which case we may have - * to service a new GPU hang, but more likely we can continue on - * without impact. - * - * If the request was guilty, we presume the context is corrupt - * and have to at least restore the RING register in the context - * image back to the expected values to skip over the guilty request. - */ - if (!request || request->fence.error != -EIO) - return; - - /* We want a simple context + ring to execute the breadcrumb update. - * We cannot rely on the context being intact across the GPU hang, - * so clear it and rebuild just what we need for the breadcrumb. - * All pending requests for this context will be zapped, and any - * future request will be after userspace has had the opportunity - * to recreate its own state. - */ - ce = &request->ctx->engine[engine->id]; - execlists_init_reg_state(ce->lrc_reg_state, - request->ctx, engine, ce->ring); - - /* Move the RING_HEAD onto the breadcrumb, past the hanging batch */ - ce->lrc_reg_state[CTX_RING_BUFFER_START+1] = - i915_ggtt_offset(ce->ring->vma); - ce->lrc_reg_state[CTX_RING_HEAD+1] = request->postfix; - - request->ring->head = request->postfix; - intel_ring_update_space(request->ring); - - /* Catch up with any missed context-switch interrupts */ - if (request->ctx != port_request(port)->ctx) { - i915_gem_request_put(port_request(port)); - port[0] = port[1]; - memset(&port[1], 0, sizeof(port[1])); - } - - GEM_BUG_ON(request->ctx != port_request(port)->ctx); - - /* Reset WaIdleLiteRestore:bdw,skl as well */ - request->tail = - intel_ring_wrap(request->ring, - request->wa_tail - WA_TAIL_DWORDS*sizeof(u32)); - assert_ring_tail_valid(request->ring, request->tail); -} - -static int intel_logical_ring_emit_pdps(struct drm_i915_gem_request *req) -{ - struct i915_hw_ppgtt *ppgtt = req->ctx->ppgtt; - struct intel_engine_cs *engine = req->engine; - const int num_lri_cmds = GEN8_3LVL_PDPES * 2; - u32 *cs; - int i; - - cs = intel_ring_begin(req, num_lri_cmds * 2 + 2); - if (IS_ERR(cs)) - return PTR_ERR(cs); - - *cs++ = MI_LOAD_REGISTER_IMM(num_lri_cmds); - for (i = GEN8_3LVL_PDPES - 1; i >= 0; i--) { - const dma_addr_t pd_daddr = i915_page_dir_dma_addr(ppgtt, i); - - *cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_UDW(engine, i)); - *cs++ = upper_32_bits(pd_daddr); - *cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_LDW(engine, i)); - *cs++ = lower_32_bits(pd_daddr); - } - - *cs++ = MI_NOOP; - intel_ring_advance(req, cs); - - return 0; -} - -static int gen8_emit_bb_start(struct drm_i915_gem_request *req, - u64 offset, u32 len, - const unsigned int flags) -{ - u32 *cs; - int ret; - - /* Don't rely in hw updating PDPs, specially in lite-restore. - * Ideally, we should set Force PD Restore in ctx descriptor, - * but we can't. Force Restore would be a second option, but - * it is unsafe in case of lite-restore (because the ctx is - * not idle). PML4 is allocated during ppgtt init so this is - * not needed in 48-bit.*/ - if (req->ctx->ppgtt && - (intel_engine_flag(req->engine) & req->ctx->ppgtt->pd_dirty_rings) && - !i915_vm_is_48bit(&req->ctx->ppgtt->base) && - !intel_vgpu_active(req->i915)) { - ret = intel_logical_ring_emit_pdps(req); - if (ret) - return ret; - - req->ctx->ppgtt->pd_dirty_rings &= ~intel_engine_flag(req->engine); - } - - cs = intel_ring_begin(req, 4); - if (IS_ERR(cs)) - return PTR_ERR(cs); - - /* FIXME(BDW): Address space and security selectors. */ - *cs++ = MI_BATCH_BUFFER_START_GEN8 | - (flags & I915_DISPATCH_SECURE ? 0 : BIT(8)) | - (flags & I915_DISPATCH_RS ? MI_BATCH_RESOURCE_STREAMER : 0); - *cs++ = lower_32_bits(offset); - *cs++ = upper_32_bits(offset); - *cs++ = MI_NOOP; - intel_ring_advance(req, cs); - - return 0; -} - -static void gen8_logical_ring_enable_irq(struct intel_engine_cs *engine) -{ - struct drm_i915_private *dev_priv = engine->i915; - I915_WRITE_IMR(engine, - ~(engine->irq_enable_mask | engine->irq_keep_mask)); - POSTING_READ_FW(RING_IMR(engine->mmio_base)); -} - -static void gen8_logical_ring_disable_irq(struct intel_engine_cs *engine) -{ - struct drm_i915_private *dev_priv = engine->i915; - I915_WRITE_IMR(engine, ~engine->irq_keep_mask); -} - -static int gen8_emit_flush(struct drm_i915_gem_request *request, u32 mode) -{ - u32 cmd, *cs; - - cs = intel_ring_begin(request, 4); - if (IS_ERR(cs)) - return PTR_ERR(cs); - - cmd = MI_FLUSH_DW + 1; - - /* We always require a command barrier so that subsequent - * commands, such as breadcrumb interrupts, are strictly ordered - * wrt the contents of the write cache being flushed to memory - * (and thus being coherent from the CPU). - */ - cmd |= MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW; - - if (mode & EMIT_INVALIDATE) { - cmd |= MI_INVALIDATE_TLB; - if (request->engine->id == VCS) - cmd |= MI_INVALIDATE_BSD; - } - - *cs++ = cmd; - *cs++ = I915_GEM_HWS_SCRATCH_ADDR | MI_FLUSH_DW_USE_GTT; - *cs++ = 0; /* upper addr */ - *cs++ = 0; /* value */ - intel_ring_advance(request, cs); - - return 0; -} - -static int gen8_emit_flush_render(struct drm_i915_gem_request *request, - u32 mode) -{ - struct intel_engine_cs *engine = request->engine; - u32 scratch_addr = - i915_ggtt_offset(engine->scratch) + 2 * CACHELINE_BYTES; - bool vf_flush_wa = false, dc_flush_wa = false; - u32 *cs, flags = 0; - int len; - - flags |= PIPE_CONTROL_CS_STALL; - - if (mode & EMIT_FLUSH) { - flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH; - flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH; - flags |= PIPE_CONTROL_DC_FLUSH_ENABLE; - flags |= PIPE_CONTROL_FLUSH_ENABLE; - } - - if (mode & EMIT_INVALIDATE) { - flags |= PIPE_CONTROL_TLB_INVALIDATE; - flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE; - flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE; - flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE; - flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE; - flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE; - flags |= PIPE_CONTROL_QW_WRITE; - flags |= PIPE_CONTROL_GLOBAL_GTT_IVB; - - /* - * On GEN9: before VF_CACHE_INVALIDATE we need to emit a NULL - * pipe control. - */ - if (IS_GEN9(request->i915)) - vf_flush_wa = true; - - /* WaForGAMHang:kbl */ - if (IS_KBL_REVID(request->i915, 0, KBL_REVID_B0)) - dc_flush_wa = true; - } - - len = 6; - - if (vf_flush_wa) - len += 6; - - if (dc_flush_wa) - len += 12; - - cs = intel_ring_begin(request, len); - if (IS_ERR(cs)) - return PTR_ERR(cs); - - if (vf_flush_wa) - cs = gen8_emit_pipe_control(cs, 0, 0); - - if (dc_flush_wa) - cs = gen8_emit_pipe_control(cs, PIPE_CONTROL_DC_FLUSH_ENABLE, - 0); - - cs = gen8_emit_pipe_control(cs, flags, scratch_addr); - - if (dc_flush_wa) - cs = gen8_emit_pipe_control(cs, PIPE_CONTROL_CS_STALL, 0); - - intel_ring_advance(request, cs); - - return 0; -} - -/* - * Reserve space for 2 NOOPs at the end of each request to be - * used as a workaround for not being allowed to do lite - * restore with HEAD==TAIL (WaIdleLiteRestore). - */ -static void gen8_emit_wa_tail(struct drm_i915_gem_request *request, u32 *cs) -{ - *cs++ = MI_NOOP; - *cs++ = MI_NOOP; - request->wa_tail = intel_ring_offset(request, cs); -} - -static void gen8_emit_breadcrumb(struct drm_i915_gem_request *request, u32 *cs) -{ - /* w/a: bit 5 needs to be zero for MI_FLUSH_DW address. */ - BUILD_BUG_ON(I915_GEM_HWS_INDEX_ADDR & (1 << 5)); - - *cs++ = (MI_FLUSH_DW + 1) | MI_FLUSH_DW_OP_STOREDW; - *cs++ = intel_hws_seqno_address(request->engine) | MI_FLUSH_DW_USE_GTT; - *cs++ = 0; - *cs++ = request->global_seqno; - *cs++ = MI_USER_INTERRUPT; - *cs++ = MI_NOOP; - request->tail = intel_ring_offset(request, cs); - assert_ring_tail_valid(request->ring, request->tail); - - gen8_emit_wa_tail(request, cs); -} - -static const int gen8_emit_breadcrumb_sz = 6 + WA_TAIL_DWORDS; - -static void gen8_emit_breadcrumb_render(struct drm_i915_gem_request *request, - u32 *cs) -{ - /* We're using qword write, seqno should be aligned to 8 bytes. */ - BUILD_BUG_ON(I915_GEM_HWS_INDEX & 1); - - /* w/a for post sync ops following a GPGPU operation we - * need a prior CS_STALL, which is emitted by the flush - * following the batch. - */ - *cs++ = GFX_OP_PIPE_CONTROL(6); - *cs++ = PIPE_CONTROL_GLOBAL_GTT_IVB | PIPE_CONTROL_CS_STALL | - PIPE_CONTROL_QW_WRITE; - *cs++ = intel_hws_seqno_address(request->engine); - *cs++ = 0; - *cs++ = request->global_seqno; - /* We're thrashing one dword of HWS. */ - *cs++ = 0; - *cs++ = MI_USER_INTERRUPT; - *cs++ = MI_NOOP; - request->tail = intel_ring_offset(request, cs); - assert_ring_tail_valid(request->ring, request->tail); - - gen8_emit_wa_tail(request, cs); -} - -static const int gen8_emit_breadcrumb_render_sz = 8 + WA_TAIL_DWORDS; - -static int gen8_init_rcs_context(struct drm_i915_gem_request *req) -{ - int ret; - - ret = intel_ring_workarounds_emit(req); - if (ret) - return ret; - - ret = intel_rcs_context_init_mocs(req); - /* - * Failing to program the MOCS is non-fatal.The system will not - * run at peak performance. So generate an error and carry on. - */ - if (ret) - DRM_ERROR("MOCS failed to program: expect performance issues.\n"); - - return i915_gem_render_state_emit(req); -} - -/** - * intel_logical_ring_cleanup() - deallocate the Engine Command Streamer - * @engine: Engine Command Streamer. - */ -void intel_logical_ring_cleanup(struct intel_engine_cs *engine) -{ - struct drm_i915_private *dev_priv; - - /* - * Tasklet cannot be active at this point due intel_mark_active/idle - * so this is just for documentation. - */ - if (WARN_ON(test_bit(TASKLET_STATE_SCHED, &engine->irq_tasklet.state))) - tasklet_kill(&engine->irq_tasklet); - - dev_priv = engine->i915; - - if (engine->buffer) { - WARN_ON((I915_READ_MODE(engine) & MODE_IDLE) == 0); - } - - if (engine->cleanup) - engine->cleanup(engine); - - if (engine->status_page.vma) { - i915_gem_object_unpin_map(engine->status_page.vma->obj); - engine->status_page.vma = NULL; - } - - intel_engine_cleanup_common(engine); - - lrc_destroy_wa_ctx(engine); - engine->i915 = NULL; - dev_priv->engine[engine->id] = NULL; - kfree(engine); -} - -static void execlists_set_default_submission(struct intel_engine_cs *engine) -{ - engine->submit_request = execlists_submit_request; - engine->schedule = execlists_schedule; - engine->irq_tasklet.func = intel_lrc_irq_handler; -} - -static void -logical_ring_default_vfuncs(struct intel_engine_cs *engine) -{ - /* Default vfuncs which can be overriden by each engine. */ - engine->init_hw = gen8_init_common_ring; - engine->reset_hw = reset_common_ring; - - engine->context_pin = execlists_context_pin; - engine->context_unpin = execlists_context_unpin; - - engine->request_alloc = execlists_request_alloc; - - engine->emit_flush = gen8_emit_flush; - engine->emit_breadcrumb = gen8_emit_breadcrumb; - engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_sz; - - engine->set_default_submission = execlists_set_default_submission; - - engine->irq_enable = gen8_logical_ring_enable_irq; - engine->irq_disable = gen8_logical_ring_disable_irq; - engine->emit_bb_start = gen8_emit_bb_start; -} - -static inline void -logical_ring_default_irqs(struct intel_engine_cs *engine) -{ - unsigned shift = engine->irq_shift; - engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT << shift; - engine->irq_keep_mask = GT_CONTEXT_SWITCH_INTERRUPT << shift; -} - -static int -lrc_setup_hws(struct intel_engine_cs *engine, struct i915_vma *vma) -{ - const int hws_offset = LRC_PPHWSP_PN * PAGE_SIZE; - void *hws; - - /* The HWSP is part of the default context object in LRC mode. */ - hws = i915_gem_object_pin_map(vma->obj, I915_MAP_WB); - if (IS_ERR(hws)) - return PTR_ERR(hws); - - engine->status_page.page_addr = hws + hws_offset; - engine->status_page.ggtt_offset = i915_ggtt_offset(vma) + hws_offset; - engine->status_page.vma = vma; - - return 0; -} - -static void -logical_ring_setup(struct intel_engine_cs *engine) -{ - struct drm_i915_private *dev_priv = engine->i915; - enum forcewake_domains fw_domains; - - intel_engine_setup_common(engine); - - /* Intentionally left blank. */ - engine->buffer = NULL; - - fw_domains = intel_uncore_forcewake_for_reg(dev_priv, - RING_ELSP(engine), - FW_REG_WRITE); - - fw_domains |= intel_uncore_forcewake_for_reg(dev_priv, - RING_CONTEXT_STATUS_PTR(engine), - FW_REG_READ | FW_REG_WRITE); - - fw_domains |= intel_uncore_forcewake_for_reg(dev_priv, - RING_CONTEXT_STATUS_BUF_BASE(engine), - FW_REG_READ); - - engine->fw_domains = fw_domains; - - tasklet_init(&engine->irq_tasklet, - intel_lrc_irq_handler, (unsigned long)engine); - - logical_ring_default_vfuncs(engine); - logical_ring_default_irqs(engine); -} - -static int -logical_ring_init(struct intel_engine_cs *engine) -{ - struct i915_gem_context *dctx = engine->i915->kernel_context; - int ret; - - ret = intel_engine_init_common(engine); - if (ret) - goto error; - - /* And setup the hardware status page. */ - ret = lrc_setup_hws(engine, dctx->engine[engine->id].state); - if (ret) { - DRM_ERROR("Failed to set up hws %s: %d\n", engine->name, ret); - goto error; - } - - return 0; - -error: - intel_logical_ring_cleanup(engine); - return ret; -} - -int logical_render_ring_init(struct intel_engine_cs *engine) -{ - struct drm_i915_private *dev_priv = engine->i915; - int ret; - - logical_ring_setup(engine); - - if (HAS_L3_DPF(dev_priv)) - engine->irq_keep_mask |= GT_RENDER_L3_PARITY_ERROR_INTERRUPT; - - /* Override some for render ring. */ - if (INTEL_GEN(dev_priv) >= 9) - engine->init_hw = gen9_init_render_ring; - else - engine->init_hw = gen8_init_render_ring; - engine->init_context = gen8_init_rcs_context; - engine->emit_flush = gen8_emit_flush_render; - engine->emit_breadcrumb = gen8_emit_breadcrumb_render; - engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_render_sz; - - ret = intel_engine_create_scratch(engine, PAGE_SIZE); - if (ret) - return ret; - - ret = intel_init_workaround_bb(engine); - if (ret) { - /* - * We continue even if we fail to initialize WA batch - * because we only expect rare glitches but nothing - * critical to prevent us from using GPU - */ - DRM_ERROR("WA batch buffer initialization failed: %d\n", - ret); - } - - return logical_ring_init(engine); -} - -int logical_xcs_ring_init(struct intel_engine_cs *engine) -{ - logical_ring_setup(engine); - - return logical_ring_init(engine); -} - -static u32 -make_rpcs(struct drm_i915_private *dev_priv) -{ - u32 rpcs = 0; - - /* - * No explicit RPCS request is needed to ensure full - * slice/subslice/EU enablement prior to Gen9. - */ - if (INTEL_GEN(dev_priv) < 9) - return 0; - - /* - * Starting in Gen9, render power gating can leave - * slice/subslice/EU in a partially enabled state. We - * must make an explicit request through RPCS for full - * enablement. - */ - if (INTEL_INFO(dev_priv)->sseu.has_slice_pg) { - rpcs |= GEN8_RPCS_S_CNT_ENABLE; - rpcs |= hweight8(INTEL_INFO(dev_priv)->sseu.slice_mask) << - GEN8_RPCS_S_CNT_SHIFT; - rpcs |= GEN8_RPCS_ENABLE; - } - - if (INTEL_INFO(dev_priv)->sseu.has_subslice_pg) { - rpcs |= GEN8_RPCS_SS_CNT_ENABLE; - rpcs |= hweight8(INTEL_INFO(dev_priv)->sseu.subslice_mask) << - GEN8_RPCS_SS_CNT_SHIFT; - rpcs |= GEN8_RPCS_ENABLE; - } - - if (INTEL_INFO(dev_priv)->sseu.has_eu_pg) { - rpcs |= INTEL_INFO(dev_priv)->sseu.eu_per_subslice << - GEN8_RPCS_EU_MIN_SHIFT; - rpcs |= INTEL_INFO(dev_priv)->sseu.eu_per_subslice << - GEN8_RPCS_EU_MAX_SHIFT; - rpcs |= GEN8_RPCS_ENABLE; - } - - return rpcs; -} - -static u32 intel_lr_indirect_ctx_offset(struct intel_engine_cs *engine) -{ - u32 indirect_ctx_offset; - - switch (INTEL_GEN(engine->i915)) { - default: - MISSING_CASE(INTEL_GEN(engine->i915)); - /* fall through */ - case 10: - indirect_ctx_offset = - GEN10_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT; - break; - case 9: - indirect_ctx_offset = - GEN9_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT; - break; - case 8: - indirect_ctx_offset = - GEN8_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT; - break; - } - - return indirect_ctx_offset; -} - -static void execlists_init_reg_state(u32 *regs, - struct i915_gem_context *ctx, - struct intel_engine_cs *engine, - struct intel_ring *ring) -{ - struct drm_i915_private *dev_priv = engine->i915; - struct i915_hw_ppgtt *ppgtt = ctx->ppgtt ?: dev_priv->mm.aliasing_ppgtt; - u32 base = engine->mmio_base; - bool rcs = engine->id == RCS; - - /* A context is actually a big batch buffer with several - * MI_LOAD_REGISTER_IMM commands followed by (reg, value) pairs. The - * values we are setting here are only for the first context restore: - * on a subsequent save, the GPU will recreate this batchbuffer with new - * values (including all the missing MI_LOAD_REGISTER_IMM commands that - * we are not initializing here). - */ - regs[CTX_LRI_HEADER_0] = MI_LOAD_REGISTER_IMM(rcs ? 14 : 11) | - MI_LRI_FORCE_POSTED; - - CTX_REG(regs, CTX_CONTEXT_CONTROL, RING_CONTEXT_CONTROL(engine), - _MASKED_BIT_ENABLE(CTX_CTRL_INHIBIT_SYN_CTX_SWITCH | - CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT | - (HAS_RESOURCE_STREAMER(dev_priv) ? - CTX_CTRL_RS_CTX_ENABLE : 0))); - CTX_REG(regs, CTX_RING_HEAD, RING_HEAD(base), 0); - CTX_REG(regs, CTX_RING_TAIL, RING_TAIL(base), 0); - CTX_REG(regs, CTX_RING_BUFFER_START, RING_START(base), 0); - CTX_REG(regs, CTX_RING_BUFFER_CONTROL, RING_CTL(base), - RING_CTL_SIZE(ring->size) | RING_VALID); - CTX_REG(regs, CTX_BB_HEAD_U, RING_BBADDR_UDW(base), 0); - CTX_REG(regs, CTX_BB_HEAD_L, RING_BBADDR(base), 0); - CTX_REG(regs, CTX_BB_STATE, RING_BBSTATE(base), RING_BB_PPGTT); - CTX_REG(regs, CTX_SECOND_BB_HEAD_U, RING_SBBADDR_UDW(base), 0); - CTX_REG(regs, CTX_SECOND_BB_HEAD_L, RING_SBBADDR(base), 0); - CTX_REG(regs, CTX_SECOND_BB_STATE, RING_SBBSTATE(base), 0); - if (rcs) { - CTX_REG(regs, CTX_BB_PER_CTX_PTR, RING_BB_PER_CTX_PTR(base), 0); - CTX_REG(regs, CTX_RCS_INDIRECT_CTX, RING_INDIRECT_CTX(base), 0); - CTX_REG(regs, CTX_RCS_INDIRECT_CTX_OFFSET, - RING_INDIRECT_CTX_OFFSET(base), 0); - - if (engine->wa_ctx.vma) { - struct i915_ctx_workarounds *wa_ctx = &engine->wa_ctx; - u32 ggtt_offset = i915_ggtt_offset(wa_ctx->vma); - - regs[CTX_RCS_INDIRECT_CTX + 1] = - (ggtt_offset + wa_ctx->indirect_ctx.offset) | - (wa_ctx->indirect_ctx.size / CACHELINE_BYTES); - - regs[CTX_RCS_INDIRECT_CTX_OFFSET + 1] = - intel_lr_indirect_ctx_offset(engine) << 6; - - regs[CTX_BB_PER_CTX_PTR + 1] = - (ggtt_offset + wa_ctx->per_ctx.offset) | 0x01; - } - } - - regs[CTX_LRI_HEADER_1] = MI_LOAD_REGISTER_IMM(9) | MI_LRI_FORCE_POSTED; - - CTX_REG(regs, CTX_CTX_TIMESTAMP, RING_CTX_TIMESTAMP(base), 0); - /* PDP values well be assigned later if needed */ - CTX_REG(regs, CTX_PDP3_UDW, GEN8_RING_PDP_UDW(engine, 3), 0); - CTX_REG(regs, CTX_PDP3_LDW, GEN8_RING_PDP_LDW(engine, 3), 0); - CTX_REG(regs, CTX_PDP2_UDW, GEN8_RING_PDP_UDW(engine, 2), 0); - CTX_REG(regs, CTX_PDP2_LDW, GEN8_RING_PDP_LDW(engine, 2), 0); - CTX_REG(regs, CTX_PDP1_UDW, GEN8_RING_PDP_UDW(engine, 1), 0); - CTX_REG(regs, CTX_PDP1_LDW, GEN8_RING_PDP_LDW(engine, 1), 0); - CTX_REG(regs, CTX_PDP0_UDW, GEN8_RING_PDP_UDW(engine, 0), 0); - CTX_REG(regs, CTX_PDP0_LDW, GEN8_RING_PDP_LDW(engine, 0), 0); - - if (ppgtt && i915_vm_is_48bit(&ppgtt->base)) { - /* 64b PPGTT (48bit canonical) - * PDP0_DESCRIPTOR contains the base address to PML4 and - * other PDP Descriptors are ignored. - */ - ASSIGN_CTX_PML4(ppgtt, regs); - } - - if (rcs) { - regs[CTX_LRI_HEADER_2] = MI_LOAD_REGISTER_IMM(1); - CTX_REG(regs, CTX_R_PWR_CLK_STATE, GEN8_R_PWR_CLK_STATE, - make_rpcs(dev_priv)); - - i915_oa_init_reg_state(engine, ctx, regs); - } -} - -static int -populate_lr_context(struct i915_gem_context *ctx, - struct drm_i915_gem_object *ctx_obj, - struct intel_engine_cs *engine, - struct intel_ring *ring) -{ - void *vaddr; - int ret; - - ret = i915_gem_object_set_to_cpu_domain(ctx_obj, true); - if (ret) { - DRM_DEBUG_DRIVER("Could not set to CPU domain\n"); - return ret; - } - - vaddr = i915_gem_object_pin_map(ctx_obj, I915_MAP_WB); - if (IS_ERR(vaddr)) { - ret = PTR_ERR(vaddr); - DRM_DEBUG_DRIVER("Could not map object pages! (%d)\n", ret); - return ret; - } - ctx_obj->mm.dirty = true; - - /* The second page of the context object contains some fields which must - * be set up prior to the first execution. */ - - execlists_init_reg_state(vaddr + LRC_STATE_PN * PAGE_SIZE, - ctx, engine, ring); - - i915_gem_object_unpin_map(ctx_obj); - - return 0; -} - -static int execlists_context_deferred_alloc(struct i915_gem_context *ctx, - struct intel_engine_cs *engine) -{ - struct drm_i915_gem_object *ctx_obj; - struct intel_context *ce = &ctx->engine[engine->id]; - struct i915_vma *vma; - uint32_t context_size; - struct intel_ring *ring; - int ret; - - WARN_ON(ce->state); - - context_size = round_up(engine->context_size, I915_GTT_PAGE_SIZE); - - /* One extra page as the sharing data between driver and GuC */ - context_size += PAGE_SIZE * LRC_PPHWSP_PN; - - ctx_obj = i915_gem_object_create(ctx->i915, context_size); - if (IS_ERR(ctx_obj)) { - DRM_DEBUG_DRIVER("Alloc LRC backing obj failed.\n"); - return PTR_ERR(ctx_obj); - } - - vma = i915_vma_instance(ctx_obj, &ctx->i915->ggtt.base, NULL); - if (IS_ERR(vma)) { - ret = PTR_ERR(vma); - goto error_deref_obj; - } - - ring = intel_engine_create_ring(engine, ctx->ring_size); - if (IS_ERR(ring)) { - ret = PTR_ERR(ring); - goto error_deref_obj; - } - - ret = populate_lr_context(ctx, ctx_obj, engine, ring); - if (ret) { - DRM_DEBUG_DRIVER("Failed to populate LRC: %d\n", ret); - goto error_ring_free; - } - - ce->ring = ring; - ce->state = vma; - ce->initialised |= engine->init_context == NULL; - - return 0; - -error_ring_free: - intel_ring_free(ring); -error_deref_obj: - i915_gem_object_put(ctx_obj); - return ret; -} - -void intel_lr_context_resume(struct drm_i915_private *dev_priv) -{ - struct intel_engine_cs *engine; - struct i915_gem_context *ctx; - enum intel_engine_id id; - - /* Because we emit WA_TAIL_DWORDS there may be a disparity - * between our bookkeeping in ce->ring->head and ce->ring->tail and - * that stored in context. As we only write new commands from - * ce->ring->tail onwards, everything before that is junk. If the GPU - * starts reading from its RING_HEAD from the context, it may try to - * execute that junk and die. - * - * So to avoid that we reset the context images upon resume. For - * simplicity, we just zero everything out. - */ - list_for_each_entry(ctx, &dev_priv->context_list, link) { - for_each_engine(engine, dev_priv, id) { - struct intel_context *ce = &ctx->engine[engine->id]; - u32 *reg; - - if (!ce->state) - continue; - - reg = i915_gem_object_pin_map(ce->state->obj, - I915_MAP_WB); - if (WARN_ON(IS_ERR(reg))) - continue; - - reg += LRC_STATE_PN * PAGE_SIZE / sizeof(*reg); - reg[CTX_RING_HEAD+1] = 0; - reg[CTX_RING_TAIL+1] = 0; - - ce->state->obj->mm.dirty = true; - i915_gem_object_unpin_map(ce->state->obj); - - intel_ring_reset(ce->ring, 0); - } - } -} |