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![Dave Gordon](/assets/img/avatar_default.png)
In various places, a single page of a (regular) GEM object is mapped into CPU address space and updated. In each such case, either the page or the the object should be marked dirty, to ensure that the modifications are not discarded if the object is evicted under memory pressure. The typical sequence is: va = kmap_atomic(i915_gem_object_get_page(obj, pageno)); *(va+offset) = ... kunmap_atomic(va); Here we introduce i915_gem_object_get_dirty_page(), which performs the same operation as i915_gem_object_get_page() but with the side-effect of marking the returned page dirty in the pagecache. This will ensure that if the object is subsequently evicted (due to memory pressure), the changes are written to backing store rather than discarded. Note that it works only for regular (shmfs-backed) GEM objects, but (at least for now) those are the only ones that are updated in this way -- the objects in question are contexts and batchbuffers, which are always shmfs-backed. Separate patches deal with the cases where whole objects are (or may be) dirtied. v3: Mark two more pages dirty in the page-boundary-crossing cases of the execbuffer relocation code [Chris Wilson] Signed-off-by: Dave Gordon <david.s.gordon@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/1449773486-30822-2-git-send-email-david.s.gordon@intel.com Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
956 lines
27 KiB
C
956 lines
27 KiB
C
/*
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* Copyright © 2014 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#include <linux/firmware.h>
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#include <linux/circ_buf.h>
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#include "i915_drv.h"
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#include "intel_guc.h"
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/**
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* DOC: GuC-based command submission
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*
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* i915_guc_client:
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* We use the term client to avoid confusion with contexts. A i915_guc_client is
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* equivalent to GuC object guc_context_desc. This context descriptor is
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* allocated from a pool of 1024 entries. Kernel driver will allocate doorbell
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* and workqueue for it. Also the process descriptor (guc_process_desc), which
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* is mapped to client space. So the client can write Work Item then ring the
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* doorbell.
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*
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* To simplify the implementation, we allocate one gem object that contains all
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* pages for doorbell, process descriptor and workqueue.
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*
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* The Scratch registers:
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* There are 16 MMIO-based registers start from 0xC180. The kernel driver writes
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* a value to the action register (SOFT_SCRATCH_0) along with any data. It then
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* triggers an interrupt on the GuC via another register write (0xC4C8).
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* Firmware writes a success/fail code back to the action register after
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* processes the request. The kernel driver polls waiting for this update and
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* then proceeds.
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* See host2guc_action()
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*
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* Doorbells:
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* Doorbells are interrupts to uKernel. A doorbell is a single cache line (QW)
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* mapped into process space.
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*
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* Work Items:
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* There are several types of work items that the host may place into a
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* workqueue, each with its own requirements and limitations. Currently only
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* WQ_TYPE_INORDER is needed to support legacy submission via GuC, which
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* represents in-order queue. The kernel driver packs ring tail pointer and an
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* ELSP context descriptor dword into Work Item.
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* See guc_add_workqueue_item()
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*
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*/
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/*
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* Read GuC command/status register (SOFT_SCRATCH_0)
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* Return true if it contains a response rather than a command
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*/
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static inline bool host2guc_action_response(struct drm_i915_private *dev_priv,
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u32 *status)
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{
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u32 val = I915_READ(SOFT_SCRATCH(0));
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*status = val;
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return GUC2HOST_IS_RESPONSE(val);
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}
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static int host2guc_action(struct intel_guc *guc, u32 *data, u32 len)
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{
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struct drm_i915_private *dev_priv = guc_to_i915(guc);
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u32 status;
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int i;
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int ret;
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if (WARN_ON(len < 1 || len > 15))
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return -EINVAL;
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intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
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dev_priv->guc.action_count += 1;
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dev_priv->guc.action_cmd = data[0];
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for (i = 0; i < len; i++)
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I915_WRITE(SOFT_SCRATCH(i), data[i]);
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POSTING_READ(SOFT_SCRATCH(i - 1));
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I915_WRITE(HOST2GUC_INTERRUPT, HOST2GUC_TRIGGER);
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/* No HOST2GUC command should take longer than 10ms */
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ret = wait_for_atomic(host2guc_action_response(dev_priv, &status), 10);
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if (status != GUC2HOST_STATUS_SUCCESS) {
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/*
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* Either the GuC explicitly returned an error (which
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* we convert to -EIO here) or no response at all was
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* received within the timeout limit (-ETIMEDOUT)
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*/
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if (ret != -ETIMEDOUT)
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ret = -EIO;
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DRM_ERROR("GUC: host2guc action 0x%X failed. ret=%d "
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"status=0x%08X response=0x%08X\n",
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data[0], ret, status,
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I915_READ(SOFT_SCRATCH(15)));
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dev_priv->guc.action_fail += 1;
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dev_priv->guc.action_err = ret;
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}
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dev_priv->guc.action_status = status;
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intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
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return ret;
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}
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/*
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* Tell the GuC to allocate or deallocate a specific doorbell
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*/
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static int host2guc_allocate_doorbell(struct intel_guc *guc,
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struct i915_guc_client *client)
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{
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u32 data[2];
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data[0] = HOST2GUC_ACTION_ALLOCATE_DOORBELL;
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data[1] = client->ctx_index;
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return host2guc_action(guc, data, 2);
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}
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static int host2guc_release_doorbell(struct intel_guc *guc,
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struct i915_guc_client *client)
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{
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u32 data[2];
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data[0] = HOST2GUC_ACTION_DEALLOCATE_DOORBELL;
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data[1] = client->ctx_index;
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return host2guc_action(guc, data, 2);
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}
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static int host2guc_sample_forcewake(struct intel_guc *guc,
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struct i915_guc_client *client)
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{
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struct drm_i915_private *dev_priv = guc_to_i915(guc);
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struct drm_device *dev = dev_priv->dev;
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u32 data[2];
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data[0] = HOST2GUC_ACTION_SAMPLE_FORCEWAKE;
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/* WaRsDisableCoarsePowerGating:skl,bxt */
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if (!intel_enable_rc6(dev_priv->dev) ||
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IS_BXT_REVID(dev, 0, BXT_REVID_A1) ||
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(IS_SKL_GT3(dev) && IS_SKL_REVID(dev, 0, SKL_REVID_E0)) ||
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(IS_SKL_GT4(dev) && IS_SKL_REVID(dev, 0, SKL_REVID_E0)))
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data[1] = 0;
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else
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/* bit 0 and 1 are for Render and Media domain separately */
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data[1] = GUC_FORCEWAKE_RENDER | GUC_FORCEWAKE_MEDIA;
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return host2guc_action(guc, data, ARRAY_SIZE(data));
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}
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/*
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* Initialise, update, or clear doorbell data shared with the GuC
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*
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* These functions modify shared data and so need access to the mapped
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* client object which contains the page being used for the doorbell
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*/
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static void guc_init_doorbell(struct intel_guc *guc,
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struct i915_guc_client *client)
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{
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struct guc_doorbell_info *doorbell;
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void *base;
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base = kmap_atomic(i915_gem_object_get_page(client->client_obj, 0));
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doorbell = base + client->doorbell_offset;
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doorbell->db_status = 1;
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doorbell->cookie = 0;
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kunmap_atomic(base);
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}
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static int guc_ring_doorbell(struct i915_guc_client *gc)
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{
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struct guc_process_desc *desc;
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union guc_doorbell_qw db_cmp, db_exc, db_ret;
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union guc_doorbell_qw *db;
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void *base;
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int attempt = 2, ret = -EAGAIN;
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base = kmap_atomic(i915_gem_object_get_page(gc->client_obj, 0));
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desc = base + gc->proc_desc_offset;
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/* Update the tail so it is visible to GuC */
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desc->tail = gc->wq_tail;
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/* current cookie */
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db_cmp.db_status = GUC_DOORBELL_ENABLED;
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db_cmp.cookie = gc->cookie;
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/* cookie to be updated */
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db_exc.db_status = GUC_DOORBELL_ENABLED;
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db_exc.cookie = gc->cookie + 1;
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if (db_exc.cookie == 0)
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db_exc.cookie = 1;
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/* pointer of current doorbell cacheline */
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db = base + gc->doorbell_offset;
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while (attempt--) {
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/* lets ring the doorbell */
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db_ret.value_qw = atomic64_cmpxchg((atomic64_t *)db,
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db_cmp.value_qw, db_exc.value_qw);
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/* if the exchange was successfully executed */
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if (db_ret.value_qw == db_cmp.value_qw) {
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/* db was successfully rung */
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gc->cookie = db_exc.cookie;
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ret = 0;
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break;
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}
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/* XXX: doorbell was lost and need to acquire it again */
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if (db_ret.db_status == GUC_DOORBELL_DISABLED)
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break;
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DRM_ERROR("Cookie mismatch. Expected %d, returned %d\n",
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db_cmp.cookie, db_ret.cookie);
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/* update the cookie to newly read cookie from GuC */
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db_cmp.cookie = db_ret.cookie;
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db_exc.cookie = db_ret.cookie + 1;
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if (db_exc.cookie == 0)
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db_exc.cookie = 1;
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}
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kunmap_atomic(base);
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return ret;
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}
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static void guc_disable_doorbell(struct intel_guc *guc,
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struct i915_guc_client *client)
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{
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struct drm_i915_private *dev_priv = guc_to_i915(guc);
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struct guc_doorbell_info *doorbell;
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void *base;
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i915_reg_t drbreg = GEN8_DRBREGL(client->doorbell_id);
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int value;
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base = kmap_atomic(i915_gem_object_get_page(client->client_obj, 0));
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doorbell = base + client->doorbell_offset;
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doorbell->db_status = 0;
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kunmap_atomic(base);
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I915_WRITE(drbreg, I915_READ(drbreg) & ~GEN8_DRB_VALID);
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value = I915_READ(drbreg);
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WARN_ON((value & GEN8_DRB_VALID) != 0);
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I915_WRITE(GEN8_DRBREGU(client->doorbell_id), 0);
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I915_WRITE(drbreg, 0);
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/* XXX: wait for any interrupts */
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/* XXX: wait for workqueue to drain */
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}
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/*
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* Select, assign and relase doorbell cachelines
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*
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* These functions track which doorbell cachelines are in use.
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* The data they manipulate is protected by the host2guc lock.
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*/
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static uint32_t select_doorbell_cacheline(struct intel_guc *guc)
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{
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const uint32_t cacheline_size = cache_line_size();
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uint32_t offset;
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/* Doorbell uses a single cache line within a page */
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offset = offset_in_page(guc->db_cacheline);
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/* Moving to next cache line to reduce contention */
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guc->db_cacheline += cacheline_size;
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DRM_DEBUG_DRIVER("selected doorbell cacheline 0x%x, next 0x%x, linesize %u\n",
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offset, guc->db_cacheline, cacheline_size);
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return offset;
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}
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static uint16_t assign_doorbell(struct intel_guc *guc, uint32_t priority)
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{
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/*
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* The bitmap is split into two halves; the first half is used for
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* normal priority contexts, the second half for high-priority ones.
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* Note that logically higher priorities are numerically less than
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* normal ones, so the test below means "is it high-priority?"
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*/
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const bool hi_pri = (priority <= GUC_CTX_PRIORITY_HIGH);
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const uint16_t half = GUC_MAX_DOORBELLS / 2;
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const uint16_t start = hi_pri ? half : 0;
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const uint16_t end = start + half;
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uint16_t id;
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id = find_next_zero_bit(guc->doorbell_bitmap, end, start);
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if (id == end)
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id = GUC_INVALID_DOORBELL_ID;
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else
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bitmap_set(guc->doorbell_bitmap, id, 1);
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DRM_DEBUG_DRIVER("assigned %s priority doorbell id 0x%x\n",
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hi_pri ? "high" : "normal", id);
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return id;
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}
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static void release_doorbell(struct intel_guc *guc, uint16_t id)
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{
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bitmap_clear(guc->doorbell_bitmap, id, 1);
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}
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/*
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* Initialise the process descriptor shared with the GuC firmware.
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*/
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static void guc_init_proc_desc(struct intel_guc *guc,
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struct i915_guc_client *client)
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{
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struct guc_process_desc *desc;
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void *base;
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base = kmap_atomic(i915_gem_object_get_page(client->client_obj, 0));
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desc = base + client->proc_desc_offset;
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memset(desc, 0, sizeof(*desc));
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/*
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* XXX: pDoorbell and WQVBaseAddress are pointers in process address
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* space for ring3 clients (set them as in mmap_ioctl) or kernel
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* space for kernel clients (map on demand instead? May make debug
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* easier to have it mapped).
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*/
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desc->wq_base_addr = 0;
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desc->db_base_addr = 0;
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desc->context_id = client->ctx_index;
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desc->wq_size_bytes = client->wq_size;
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desc->wq_status = WQ_STATUS_ACTIVE;
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desc->priority = client->priority;
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kunmap_atomic(base);
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}
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/*
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* Initialise/clear the context descriptor shared with the GuC firmware.
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*
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* This descriptor tells the GuC where (in GGTT space) to find the important
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* data structures relating to this client (doorbell, process descriptor,
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* write queue, etc).
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*/
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static void guc_init_ctx_desc(struct intel_guc *guc,
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struct i915_guc_client *client)
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{
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struct intel_context *ctx = client->owner;
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struct guc_context_desc desc;
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struct sg_table *sg;
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int i;
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memset(&desc, 0, sizeof(desc));
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desc.attribute = GUC_CTX_DESC_ATTR_ACTIVE | GUC_CTX_DESC_ATTR_KERNEL;
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desc.context_id = client->ctx_index;
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desc.priority = client->priority;
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desc.db_id = client->doorbell_id;
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for (i = 0; i < I915_NUM_RINGS; i++) {
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struct guc_execlist_context *lrc = &desc.lrc[i];
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struct intel_ringbuffer *ringbuf = ctx->engine[i].ringbuf;
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struct intel_engine_cs *ring;
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struct drm_i915_gem_object *obj;
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uint64_t ctx_desc;
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/* TODO: We have a design issue to be solved here. Only when we
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* receive the first batch, we know which engine is used by the
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* user. But here GuC expects the lrc and ring to be pinned. It
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* is not an issue for default context, which is the only one
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* for now who owns a GuC client. But for future owner of GuC
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* client, need to make sure lrc is pinned prior to enter here.
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*/
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obj = ctx->engine[i].state;
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if (!obj)
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break; /* XXX: continue? */
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ring = ringbuf->ring;
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ctx_desc = intel_lr_context_descriptor(ctx, ring);
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lrc->context_desc = (u32)ctx_desc;
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/* The state page is after PPHWSP */
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lrc->ring_lcra = i915_gem_obj_ggtt_offset(obj) +
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LRC_STATE_PN * PAGE_SIZE;
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lrc->context_id = (client->ctx_index << GUC_ELC_CTXID_OFFSET) |
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(ring->id << GUC_ELC_ENGINE_OFFSET);
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obj = ringbuf->obj;
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lrc->ring_begin = i915_gem_obj_ggtt_offset(obj);
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lrc->ring_end = lrc->ring_begin + obj->base.size - 1;
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lrc->ring_next_free_location = lrc->ring_begin;
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lrc->ring_current_tail_pointer_value = 0;
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desc.engines_used |= (1 << ring->id);
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}
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WARN_ON(desc.engines_used == 0);
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/*
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* The CPU address is only needed at certain points, so kmap_atomic on
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* demand instead of storing it in the ctx descriptor.
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* XXX: May make debug easier to have it mapped
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*/
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desc.db_trigger_cpu = 0;
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desc.db_trigger_uk = client->doorbell_offset +
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i915_gem_obj_ggtt_offset(client->client_obj);
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desc.db_trigger_phy = client->doorbell_offset +
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sg_dma_address(client->client_obj->pages->sgl);
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desc.process_desc = client->proc_desc_offset +
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i915_gem_obj_ggtt_offset(client->client_obj);
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desc.wq_addr = client->wq_offset +
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i915_gem_obj_ggtt_offset(client->client_obj);
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desc.wq_size = client->wq_size;
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/*
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* XXX: Take LRCs from an existing intel_context if this is not an
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* IsKMDCreatedContext client
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*/
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desc.desc_private = (uintptr_t)client;
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/* Pool context is pinned already */
|
|
sg = guc->ctx_pool_obj->pages;
|
|
sg_pcopy_from_buffer(sg->sgl, sg->nents, &desc, sizeof(desc),
|
|
sizeof(desc) * client->ctx_index);
|
|
}
|
|
|
|
static void guc_fini_ctx_desc(struct intel_guc *guc,
|
|
struct i915_guc_client *client)
|
|
{
|
|
struct guc_context_desc desc;
|
|
struct sg_table *sg;
|
|
|
|
memset(&desc, 0, sizeof(desc));
|
|
|
|
sg = guc->ctx_pool_obj->pages;
|
|
sg_pcopy_from_buffer(sg->sgl, sg->nents, &desc, sizeof(desc),
|
|
sizeof(desc) * client->ctx_index);
|
|
}
|
|
|
|
/* Get valid workqueue item and return it back to offset */
|
|
static int guc_get_workqueue_space(struct i915_guc_client *gc, u32 *offset)
|
|
{
|
|
struct guc_process_desc *desc;
|
|
void *base;
|
|
u32 size = sizeof(struct guc_wq_item);
|
|
int ret = -ETIMEDOUT, timeout_counter = 200;
|
|
|
|
base = kmap_atomic(i915_gem_object_get_page(gc->client_obj, 0));
|
|
desc = base + gc->proc_desc_offset;
|
|
|
|
while (timeout_counter-- > 0) {
|
|
if (CIRC_SPACE(gc->wq_tail, desc->head, gc->wq_size) >= size) {
|
|
*offset = gc->wq_tail;
|
|
|
|
/* advance the tail for next workqueue item */
|
|
gc->wq_tail += size;
|
|
gc->wq_tail &= gc->wq_size - 1;
|
|
|
|
/* this will break the loop */
|
|
timeout_counter = 0;
|
|
ret = 0;
|
|
}
|
|
|
|
if (timeout_counter)
|
|
usleep_range(1000, 2000);
|
|
};
|
|
|
|
kunmap_atomic(base);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int guc_add_workqueue_item(struct i915_guc_client *gc,
|
|
struct drm_i915_gem_request *rq)
|
|
{
|
|
enum intel_ring_id ring_id = rq->ring->id;
|
|
struct guc_wq_item *wqi;
|
|
void *base;
|
|
u32 tail, wq_len, wq_off = 0;
|
|
int ret;
|
|
|
|
ret = guc_get_workqueue_space(gc, &wq_off);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* For now workqueue item is 4 DWs; workqueue buffer is 2 pages. So we
|
|
* should not have the case where structure wqi is across page, neither
|
|
* wrapped to the beginning. This simplifies the implementation below.
|
|
*
|
|
* XXX: if not the case, we need save data to a temp wqi and copy it to
|
|
* workqueue buffer dw by dw.
|
|
*/
|
|
WARN_ON(sizeof(struct guc_wq_item) != 16);
|
|
WARN_ON(wq_off & 3);
|
|
|
|
/* wq starts from the page after doorbell / process_desc */
|
|
base = kmap_atomic(i915_gem_object_get_page(gc->client_obj,
|
|
(wq_off + GUC_DB_SIZE) >> PAGE_SHIFT));
|
|
wq_off &= PAGE_SIZE - 1;
|
|
wqi = (struct guc_wq_item *)((char *)base + wq_off);
|
|
|
|
/* len does not include the header */
|
|
wq_len = sizeof(struct guc_wq_item) / sizeof(u32) - 1;
|
|
wqi->header = WQ_TYPE_INORDER |
|
|
(wq_len << WQ_LEN_SHIFT) |
|
|
(ring_id << WQ_TARGET_SHIFT) |
|
|
WQ_NO_WCFLUSH_WAIT;
|
|
|
|
/* The GuC wants only the low-order word of the context descriptor */
|
|
wqi->context_desc = (u32)intel_lr_context_descriptor(rq->ctx, rq->ring);
|
|
|
|
/* The GuC firmware wants the tail index in QWords, not bytes */
|
|
tail = rq->ringbuf->tail >> 3;
|
|
wqi->ring_tail = tail << WQ_RING_TAIL_SHIFT;
|
|
wqi->fence_id = 0; /*XXX: what fence to be here */
|
|
|
|
kunmap_atomic(base);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define CTX_RING_BUFFER_START 0x08
|
|
|
|
/* Update the ringbuffer pointer in a saved context image */
|
|
static void lr_context_update(struct drm_i915_gem_request *rq)
|
|
{
|
|
enum intel_ring_id ring_id = rq->ring->id;
|
|
struct drm_i915_gem_object *ctx_obj = rq->ctx->engine[ring_id].state;
|
|
struct drm_i915_gem_object *rb_obj = rq->ringbuf->obj;
|
|
struct page *page;
|
|
uint32_t *reg_state;
|
|
|
|
BUG_ON(!ctx_obj);
|
|
WARN_ON(!i915_gem_obj_is_pinned(ctx_obj));
|
|
WARN_ON(!i915_gem_obj_is_pinned(rb_obj));
|
|
|
|
page = i915_gem_object_get_dirty_page(ctx_obj, LRC_STATE_PN);
|
|
reg_state = kmap_atomic(page);
|
|
|
|
reg_state[CTX_RING_BUFFER_START+1] = i915_gem_obj_ggtt_offset(rb_obj);
|
|
|
|
kunmap_atomic(reg_state);
|
|
}
|
|
|
|
/**
|
|
* i915_guc_submit() - Submit commands through GuC
|
|
* @client: the guc client where commands will go through
|
|
* @rq: request associated with the commands
|
|
*
|
|
* Return: 0 if succeed
|
|
*/
|
|
int i915_guc_submit(struct i915_guc_client *client,
|
|
struct drm_i915_gem_request *rq)
|
|
{
|
|
struct intel_guc *guc = client->guc;
|
|
enum intel_ring_id ring_id = rq->ring->id;
|
|
int q_ret, b_ret;
|
|
|
|
/* Need this because of the deferred pin ctx and ring */
|
|
/* Shall we move this right after ring is pinned? */
|
|
lr_context_update(rq);
|
|
|
|
q_ret = guc_add_workqueue_item(client, rq);
|
|
if (q_ret == 0)
|
|
b_ret = guc_ring_doorbell(client);
|
|
|
|
client->submissions[ring_id] += 1;
|
|
if (q_ret) {
|
|
client->q_fail += 1;
|
|
client->retcode = q_ret;
|
|
} else if (b_ret) {
|
|
client->b_fail += 1;
|
|
client->retcode = q_ret = b_ret;
|
|
} else {
|
|
client->retcode = 0;
|
|
}
|
|
guc->submissions[ring_id] += 1;
|
|
guc->last_seqno[ring_id] = rq->seqno;
|
|
|
|
return q_ret;
|
|
}
|
|
|
|
/*
|
|
* Everything below here is concerned with setup & teardown, and is
|
|
* therefore not part of the somewhat time-critical batch-submission
|
|
* path of i915_guc_submit() above.
|
|
*/
|
|
|
|
/**
|
|
* gem_allocate_guc_obj() - Allocate gem object for GuC usage
|
|
* @dev: drm device
|
|
* @size: size of object
|
|
*
|
|
* This is a wrapper to create a gem obj. In order to use it inside GuC, the
|
|
* object needs to be pinned lifetime. Also we must pin it to gtt space other
|
|
* than [0, GUC_WOPCM_TOP) because this range is reserved inside GuC.
|
|
*
|
|
* Return: A drm_i915_gem_object if successful, otherwise NULL.
|
|
*/
|
|
static struct drm_i915_gem_object *gem_allocate_guc_obj(struct drm_device *dev,
|
|
u32 size)
|
|
{
|
|
struct drm_i915_private *dev_priv = dev->dev_private;
|
|
struct drm_i915_gem_object *obj;
|
|
|
|
obj = i915_gem_alloc_object(dev, size);
|
|
if (!obj)
|
|
return NULL;
|
|
|
|
if (i915_gem_object_get_pages(obj)) {
|
|
drm_gem_object_unreference(&obj->base);
|
|
return NULL;
|
|
}
|
|
|
|
if (i915_gem_obj_ggtt_pin(obj, PAGE_SIZE,
|
|
PIN_OFFSET_BIAS | GUC_WOPCM_TOP)) {
|
|
drm_gem_object_unreference(&obj->base);
|
|
return NULL;
|
|
}
|
|
|
|
/* Invalidate GuC TLB to let GuC take the latest updates to GTT. */
|
|
I915_WRITE(GEN8_GTCR, GEN8_GTCR_INVALIDATE);
|
|
|
|
return obj;
|
|
}
|
|
|
|
/**
|
|
* gem_release_guc_obj() - Release gem object allocated for GuC usage
|
|
* @obj: gem obj to be released
|
|
*/
|
|
static void gem_release_guc_obj(struct drm_i915_gem_object *obj)
|
|
{
|
|
if (!obj)
|
|
return;
|
|
|
|
if (i915_gem_obj_is_pinned(obj))
|
|
i915_gem_object_ggtt_unpin(obj);
|
|
|
|
drm_gem_object_unreference(&obj->base);
|
|
}
|
|
|
|
static void guc_client_free(struct drm_device *dev,
|
|
struct i915_guc_client *client)
|
|
{
|
|
struct drm_i915_private *dev_priv = dev->dev_private;
|
|
struct intel_guc *guc = &dev_priv->guc;
|
|
|
|
if (!client)
|
|
return;
|
|
|
|
if (client->doorbell_id != GUC_INVALID_DOORBELL_ID) {
|
|
/*
|
|
* First disable the doorbell, then tell the GuC we've
|
|
* finished with it, finally deallocate it in our bitmap
|
|
*/
|
|
guc_disable_doorbell(guc, client);
|
|
host2guc_release_doorbell(guc, client);
|
|
release_doorbell(guc, client->doorbell_id);
|
|
}
|
|
|
|
/*
|
|
* XXX: wait for any outstanding submissions before freeing memory.
|
|
* Be sure to drop any locks
|
|
*/
|
|
|
|
gem_release_guc_obj(client->client_obj);
|
|
|
|
if (client->ctx_index != GUC_INVALID_CTX_ID) {
|
|
guc_fini_ctx_desc(guc, client);
|
|
ida_simple_remove(&guc->ctx_ids, client->ctx_index);
|
|
}
|
|
|
|
kfree(client);
|
|
}
|
|
|
|
/**
|
|
* guc_client_alloc() - Allocate an i915_guc_client
|
|
* @dev: drm device
|
|
* @priority: four levels priority _CRITICAL, _HIGH, _NORMAL and _LOW
|
|
* The kernel client to replace ExecList submission is created with
|
|
* NORMAL priority. Priority of a client for scheduler can be HIGH,
|
|
* while a preemption context can use CRITICAL.
|
|
* @ctx: the context that owns the client (we use the default render
|
|
* context)
|
|
*
|
|
* Return: An i915_guc_client object if success.
|
|
*/
|
|
static struct i915_guc_client *guc_client_alloc(struct drm_device *dev,
|
|
uint32_t priority,
|
|
struct intel_context *ctx)
|
|
{
|
|
struct i915_guc_client *client;
|
|
struct drm_i915_private *dev_priv = dev->dev_private;
|
|
struct intel_guc *guc = &dev_priv->guc;
|
|
struct drm_i915_gem_object *obj;
|
|
|
|
client = kzalloc(sizeof(*client), GFP_KERNEL);
|
|
if (!client)
|
|
return NULL;
|
|
|
|
client->doorbell_id = GUC_INVALID_DOORBELL_ID;
|
|
client->priority = priority;
|
|
client->owner = ctx;
|
|
client->guc = guc;
|
|
|
|
client->ctx_index = (uint32_t)ida_simple_get(&guc->ctx_ids, 0,
|
|
GUC_MAX_GPU_CONTEXTS, GFP_KERNEL);
|
|
if (client->ctx_index >= GUC_MAX_GPU_CONTEXTS) {
|
|
client->ctx_index = GUC_INVALID_CTX_ID;
|
|
goto err;
|
|
}
|
|
|
|
/* The first page is doorbell/proc_desc. Two followed pages are wq. */
|
|
obj = gem_allocate_guc_obj(dev, GUC_DB_SIZE + GUC_WQ_SIZE);
|
|
if (!obj)
|
|
goto err;
|
|
|
|
client->client_obj = obj;
|
|
client->wq_offset = GUC_DB_SIZE;
|
|
client->wq_size = GUC_WQ_SIZE;
|
|
|
|
client->doorbell_offset = select_doorbell_cacheline(guc);
|
|
|
|
/*
|
|
* Since the doorbell only requires a single cacheline, we can save
|
|
* space by putting the application process descriptor in the same
|
|
* page. Use the half of the page that doesn't include the doorbell.
|
|
*/
|
|
if (client->doorbell_offset >= (GUC_DB_SIZE / 2))
|
|
client->proc_desc_offset = 0;
|
|
else
|
|
client->proc_desc_offset = (GUC_DB_SIZE / 2);
|
|
|
|
client->doorbell_id = assign_doorbell(guc, client->priority);
|
|
if (client->doorbell_id == GUC_INVALID_DOORBELL_ID)
|
|
/* XXX: evict a doorbell instead */
|
|
goto err;
|
|
|
|
guc_init_proc_desc(guc, client);
|
|
guc_init_ctx_desc(guc, client);
|
|
guc_init_doorbell(guc, client);
|
|
|
|
/* XXX: Any cache flushes needed? General domain mgmt calls? */
|
|
|
|
if (host2guc_allocate_doorbell(guc, client))
|
|
goto err;
|
|
|
|
DRM_DEBUG_DRIVER("new priority %u client %p: ctx_index %u db_id %u\n",
|
|
priority, client, client->ctx_index, client->doorbell_id);
|
|
|
|
return client;
|
|
|
|
err:
|
|
DRM_ERROR("FAILED to create priority %u GuC client!\n", priority);
|
|
|
|
guc_client_free(dev, client);
|
|
return NULL;
|
|
}
|
|
|
|
static void guc_create_log(struct intel_guc *guc)
|
|
{
|
|
struct drm_i915_private *dev_priv = guc_to_i915(guc);
|
|
struct drm_i915_gem_object *obj;
|
|
unsigned long offset;
|
|
uint32_t size, flags;
|
|
|
|
if (i915.guc_log_level < GUC_LOG_VERBOSITY_MIN)
|
|
return;
|
|
|
|
if (i915.guc_log_level > GUC_LOG_VERBOSITY_MAX)
|
|
i915.guc_log_level = GUC_LOG_VERBOSITY_MAX;
|
|
|
|
/* The first page is to save log buffer state. Allocate one
|
|
* extra page for others in case for overlap */
|
|
size = (1 + GUC_LOG_DPC_PAGES + 1 +
|
|
GUC_LOG_ISR_PAGES + 1 +
|
|
GUC_LOG_CRASH_PAGES + 1) << PAGE_SHIFT;
|
|
|
|
obj = guc->log_obj;
|
|
if (!obj) {
|
|
obj = gem_allocate_guc_obj(dev_priv->dev, size);
|
|
if (!obj) {
|
|
/* logging will be off */
|
|
i915.guc_log_level = -1;
|
|
return;
|
|
}
|
|
|
|
guc->log_obj = obj;
|
|
}
|
|
|
|
/* each allocated unit is a page */
|
|
flags = GUC_LOG_VALID | GUC_LOG_NOTIFY_ON_HALF_FULL |
|
|
(GUC_LOG_DPC_PAGES << GUC_LOG_DPC_SHIFT) |
|
|
(GUC_LOG_ISR_PAGES << GUC_LOG_ISR_SHIFT) |
|
|
(GUC_LOG_CRASH_PAGES << GUC_LOG_CRASH_SHIFT);
|
|
|
|
offset = i915_gem_obj_ggtt_offset(obj) >> PAGE_SHIFT; /* in pages */
|
|
guc->log_flags = (offset << GUC_LOG_BUF_ADDR_SHIFT) | flags;
|
|
}
|
|
|
|
/*
|
|
* Set up the memory resources to be shared with the GuC. At this point,
|
|
* we require just one object that can be mapped through the GGTT.
|
|
*/
|
|
int i915_guc_submission_init(struct drm_device *dev)
|
|
{
|
|
struct drm_i915_private *dev_priv = dev->dev_private;
|
|
const size_t ctxsize = sizeof(struct guc_context_desc);
|
|
const size_t poolsize = GUC_MAX_GPU_CONTEXTS * ctxsize;
|
|
const size_t gemsize = round_up(poolsize, PAGE_SIZE);
|
|
struct intel_guc *guc = &dev_priv->guc;
|
|
|
|
if (!i915.enable_guc_submission)
|
|
return 0; /* not enabled */
|
|
|
|
if (guc->ctx_pool_obj)
|
|
return 0; /* already allocated */
|
|
|
|
guc->ctx_pool_obj = gem_allocate_guc_obj(dev_priv->dev, gemsize);
|
|
if (!guc->ctx_pool_obj)
|
|
return -ENOMEM;
|
|
|
|
ida_init(&guc->ctx_ids);
|
|
|
|
guc_create_log(guc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int i915_guc_submission_enable(struct drm_device *dev)
|
|
{
|
|
struct drm_i915_private *dev_priv = dev->dev_private;
|
|
struct intel_guc *guc = &dev_priv->guc;
|
|
struct intel_context *ctx = dev_priv->ring[RCS].default_context;
|
|
struct i915_guc_client *client;
|
|
|
|
/* client for execbuf submission */
|
|
client = guc_client_alloc(dev, GUC_CTX_PRIORITY_KMD_NORMAL, ctx);
|
|
if (!client) {
|
|
DRM_ERROR("Failed to create execbuf guc_client\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
guc->execbuf_client = client;
|
|
|
|
host2guc_sample_forcewake(guc, client);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void i915_guc_submission_disable(struct drm_device *dev)
|
|
{
|
|
struct drm_i915_private *dev_priv = dev->dev_private;
|
|
struct intel_guc *guc = &dev_priv->guc;
|
|
|
|
guc_client_free(dev, guc->execbuf_client);
|
|
guc->execbuf_client = NULL;
|
|
}
|
|
|
|
void i915_guc_submission_fini(struct drm_device *dev)
|
|
{
|
|
struct drm_i915_private *dev_priv = dev->dev_private;
|
|
struct intel_guc *guc = &dev_priv->guc;
|
|
|
|
gem_release_guc_obj(dev_priv->guc.log_obj);
|
|
guc->log_obj = NULL;
|
|
|
|
if (guc->ctx_pool_obj)
|
|
ida_destroy(&guc->ctx_ids);
|
|
gem_release_guc_obj(guc->ctx_pool_obj);
|
|
guc->ctx_pool_obj = NULL;
|
|
}
|
|
|
|
/**
|
|
* intel_guc_suspend() - notify GuC entering suspend state
|
|
* @dev: drm device
|
|
*/
|
|
int intel_guc_suspend(struct drm_device *dev)
|
|
{
|
|
struct drm_i915_private *dev_priv = dev->dev_private;
|
|
struct intel_guc *guc = &dev_priv->guc;
|
|
struct intel_context *ctx;
|
|
u32 data[3];
|
|
|
|
if (!i915.enable_guc_submission)
|
|
return 0;
|
|
|
|
ctx = dev_priv->ring[RCS].default_context;
|
|
|
|
data[0] = HOST2GUC_ACTION_ENTER_S_STATE;
|
|
/* any value greater than GUC_POWER_D0 */
|
|
data[1] = GUC_POWER_D1;
|
|
/* first page is shared data with GuC */
|
|
data[2] = i915_gem_obj_ggtt_offset(ctx->engine[RCS].state);
|
|
|
|
return host2guc_action(guc, data, ARRAY_SIZE(data));
|
|
}
|
|
|
|
|
|
/**
|
|
* intel_guc_resume() - notify GuC resuming from suspend state
|
|
* @dev: drm device
|
|
*/
|
|
int intel_guc_resume(struct drm_device *dev)
|
|
{
|
|
struct drm_i915_private *dev_priv = dev->dev_private;
|
|
struct intel_guc *guc = &dev_priv->guc;
|
|
struct intel_context *ctx;
|
|
u32 data[3];
|
|
|
|
if (!i915.enable_guc_submission)
|
|
return 0;
|
|
|
|
ctx = dev_priv->ring[RCS].default_context;
|
|
|
|
data[0] = HOST2GUC_ACTION_EXIT_S_STATE;
|
|
data[1] = GUC_POWER_D0;
|
|
/* first page is shared data with GuC */
|
|
data[2] = i915_gem_obj_ggtt_offset(ctx->engine[RCS].state);
|
|
|
|
return host2guc_action(guc, data, ARRAY_SIZE(data));
|
|
}
|