[Intel-gfx] [RFC] drm/i915/lrc: allocate separate page for HWSP
Daniele Ceraolo Spurio
daniele.ceraolospurio at intel.com
Thu Jul 6 16:10:40 UTC 2017
On gen8+ we're currently using the PPHWSP of the kernel ctx as the
global HWSP. However, when the kernel ctx gets submitted (e.g. from
__intel_autoenable_gt_powersave) the HW will use that page as both
HWSP and PPHWSP. Currently we're not seeing any problem because the
conflict happens at offsets below 0x30 in an area we don't access,
but that is not guaranteed to be true for future platform.
To avoid the conflict, instead of re-using the PPHWSP of the kernel
ctx we can allocate a separate page for the HWSP like what happens for
pre-execlists platform.
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Michel Thierry <michel.thierry at intel.com>
---
drivers/gpu/drm/i915/intel_engine_cs.c | 123 +++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_lrc.c | 42 +----------
drivers/gpu/drm/i915/intel_ringbuffer.c | 125 +-------------------------------
3 files changed, 127 insertions(+), 163 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index a55cd72..70e9d88 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -444,6 +444,114 @@ static void intel_engine_cleanup_scratch(struct intel_engine_cs *engine)
i915_vma_unpin_and_release(&engine->scratch);
}
+static void cleanup_phys_status_page(struct intel_engine_cs *engine)
+{
+ struct drm_i915_private *dev_priv = engine->i915;
+
+ if (!dev_priv->status_page_dmah)
+ return;
+
+ drm_pci_free(&dev_priv->drm, dev_priv->status_page_dmah);
+ engine->status_page.page_addr = NULL;
+}
+
+static void cleanup_status_page(struct intel_engine_cs *engine)
+{
+ struct i915_vma *vma;
+ struct drm_i915_gem_object *obj;
+
+ vma = fetch_and_zero(&engine->status_page.vma);
+ if (!vma)
+ return;
+
+ obj = vma->obj;
+
+ i915_vma_unpin(vma);
+ i915_vma_close(vma);
+
+ i915_gem_object_unpin_map(obj);
+ __i915_gem_object_release_unless_active(obj);
+}
+
+static int init_status_page(struct intel_engine_cs *engine)
+{
+ struct drm_i915_gem_object *obj;
+ struct i915_vma *vma;
+ unsigned int flags;
+ void *vaddr;
+ int ret;
+
+ obj = i915_gem_object_create_internal(engine->i915, PAGE_SIZE);
+ if (IS_ERR(obj)) {
+ DRM_ERROR("Failed to allocate status page\n");
+ return PTR_ERR(obj);
+ }
+
+ ret = i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);
+ if (ret)
+ goto err;
+
+ vma = i915_vma_instance(obj, &engine->i915->ggtt.base, NULL);
+ if (IS_ERR(vma)) {
+ ret = PTR_ERR(vma);
+ goto err;
+ }
+
+ flags = PIN_GLOBAL;
+ if (!HAS_LLC(engine->i915))
+ /* On g33, we cannot place HWS above 256MiB, so
+ * restrict its pinning to the low mappable arena.
+ * Though this restriction is not documented for
+ * gen4, gen5, or byt, they also behave similarly
+ * and hang if the HWS is placed at the top of the
+ * GTT. To generalise, it appears that all !llc
+ * platforms have issues with us placing the HWS
+ * above the mappable region (even though we never
+ * actualy map it).
+ */
+ flags |= PIN_MAPPABLE;
+ ret = i915_vma_pin(vma, 0, 4096, flags);
+ if (ret)
+ goto err;
+
+ vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
+ if (IS_ERR(vaddr)) {
+ ret = PTR_ERR(vaddr);
+ goto err_unpin;
+ }
+
+ engine->status_page.vma = vma;
+ engine->status_page.ggtt_offset = i915_ggtt_offset(vma);
+ engine->status_page.page_addr = memset(vaddr, 0, PAGE_SIZE);
+
+ DRM_DEBUG_DRIVER("%s hws offset: 0x%08x\n",
+ engine->name, i915_ggtt_offset(vma));
+ return 0;
+
+err_unpin:
+ i915_vma_unpin(vma);
+err:
+ i915_gem_object_put(obj);
+ return ret;
+}
+
+static int init_phys_status_page(struct intel_engine_cs *engine)
+{
+ struct drm_i915_private *dev_priv = engine->i915;
+
+ GEM_BUG_ON(engine->id != RCS);
+
+ dev_priv->status_page_dmah =
+ drm_pci_alloc(&dev_priv->drm, PAGE_SIZE, PAGE_SIZE);
+ if (!dev_priv->status_page_dmah)
+ return -ENOMEM;
+
+ engine->status_page.page_addr = dev_priv->status_page_dmah->vaddr;
+ memset(engine->status_page.page_addr, 0, PAGE_SIZE);
+
+ return 0;
+}
+
/**
* intel_engines_init_common - initialize cengine state which might require hw access
* @engine: Engine to initialize.
@@ -481,8 +589,18 @@ int intel_engine_init_common(struct intel_engine_cs *engine)
if (ret)
goto err_unpin;
+ if (HWS_NEEDS_PHYSICAL(engine->i915))
+ ret = init_phys_status_page(engine);
+ else
+ ret = init_status_page(engine);
+ if (ret)
+ goto err_rs_fini;
+
return 0;
+err_rs_fini:
+ i915_gem_render_state_fini(engine);
+
err_unpin:
engine->context_unpin(engine, engine->i915->kernel_context);
return ret;
@@ -499,6 +617,11 @@ void intel_engine_cleanup_common(struct intel_engine_cs *engine)
{
intel_engine_cleanup_scratch(engine);
+ if (HWS_NEEDS_PHYSICAL(engine->i915))
+ cleanup_phys_status_page(engine);
+ else
+ cleanup_status_page(engine);
+
i915_gem_render_state_fini(engine);
intel_engine_fini_breadcrumbs(engine);
intel_engine_cleanup_cmd_parser(engine);
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 699868d..d84a36c 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1641,11 +1641,6 @@ void intel_logical_ring_cleanup(struct intel_engine_cs *engine)
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);
@@ -1692,24 +1687,6 @@ static void execlists_set_default_submission(struct intel_engine_cs *engine)
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)
{
@@ -1742,27 +1719,14 @@ static void execlists_set_default_submission(struct intel_engine_cs *engine)
logical_ring_default_irqs(engine);
}
-static int
-logical_ring_init(struct intel_engine_cs *engine)
+static int logical_ring_init(struct intel_engine_cs *engine)
{
- struct i915_gem_context *dctx = engine->i915->kernel_context;
- int ret;
+ int ret = 0;
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;
+ intel_logical_ring_cleanup(engine);
-error:
- intel_logical_ring_cleanup(engine);
return ret;
}
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 5224b7a..b258053 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1174,113 +1174,7 @@ static void gen8_render_emit_breadcrumb(struct drm_i915_gem_request *req,
return 0;
}
-static void cleanup_phys_status_page(struct intel_engine_cs *engine)
-{
- struct drm_i915_private *dev_priv = engine->i915;
-
- if (!dev_priv->status_page_dmah)
- return;
-
- drm_pci_free(&dev_priv->drm, dev_priv->status_page_dmah);
- engine->status_page.page_addr = NULL;
-}
-
-static void cleanup_status_page(struct intel_engine_cs *engine)
-{
- struct i915_vma *vma;
- struct drm_i915_gem_object *obj;
-
- vma = fetch_and_zero(&engine->status_page.vma);
- if (!vma)
- return;
-
- obj = vma->obj;
-
- i915_vma_unpin(vma);
- i915_vma_close(vma);
-
- i915_gem_object_unpin_map(obj);
- __i915_gem_object_release_unless_active(obj);
-}
-static int init_status_page(struct intel_engine_cs *engine)
-{
- struct drm_i915_gem_object *obj;
- struct i915_vma *vma;
- unsigned int flags;
- void *vaddr;
- int ret;
-
- obj = i915_gem_object_create_internal(engine->i915, PAGE_SIZE);
- if (IS_ERR(obj)) {
- DRM_ERROR("Failed to allocate status page\n");
- return PTR_ERR(obj);
- }
-
- ret = i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);
- if (ret)
- goto err;
-
- vma = i915_vma_instance(obj, &engine->i915->ggtt.base, NULL);
- if (IS_ERR(vma)) {
- ret = PTR_ERR(vma);
- goto err;
- }
-
- flags = PIN_GLOBAL;
- if (!HAS_LLC(engine->i915))
- /* On g33, we cannot place HWS above 256MiB, so
- * restrict its pinning to the low mappable arena.
- * Though this restriction is not documented for
- * gen4, gen5, or byt, they also behave similarly
- * and hang if the HWS is placed at the top of the
- * GTT. To generalise, it appears that all !llc
- * platforms have issues with us placing the HWS
- * above the mappable region (even though we never
- * actualy map it).
- */
- flags |= PIN_MAPPABLE;
- ret = i915_vma_pin(vma, 0, 4096, flags);
- if (ret)
- goto err;
-
- vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
- if (IS_ERR(vaddr)) {
- ret = PTR_ERR(vaddr);
- goto err_unpin;
- }
-
- engine->status_page.vma = vma;
- engine->status_page.ggtt_offset = i915_ggtt_offset(vma);
- engine->status_page.page_addr = memset(vaddr, 0, PAGE_SIZE);
-
- DRM_DEBUG_DRIVER("%s hws offset: 0x%08x\n",
- engine->name, i915_ggtt_offset(vma));
- return 0;
-
-err_unpin:
- i915_vma_unpin(vma);
-err:
- i915_gem_object_put(obj);
- return ret;
-}
-
-static int init_phys_status_page(struct intel_engine_cs *engine)
-{
- struct drm_i915_private *dev_priv = engine->i915;
-
- GEM_BUG_ON(engine->id != RCS);
-
- dev_priv->status_page_dmah =
- drm_pci_alloc(&dev_priv->drm, PAGE_SIZE, PAGE_SIZE);
- if (!dev_priv->status_page_dmah)
- return -ENOMEM;
-
- engine->status_page.page_addr = dev_priv->status_page_dmah->vaddr;
- memset(engine->status_page.page_addr, 0, PAGE_SIZE);
-
- return 0;
-}
int intel_ring_pin(struct intel_ring *ring,
struct drm_i915_private *i915,
@@ -1567,17 +1461,10 @@ static int intel_init_ring_buffer(struct intel_engine_cs *engine)
if (err)
goto err;
- if (HWS_NEEDS_PHYSICAL(engine->i915))
- err = init_phys_status_page(engine);
- else
- err = init_status_page(engine);
- if (err)
- goto err;
-
ring = intel_engine_create_ring(engine, 32 * PAGE_SIZE);
if (IS_ERR(ring)) {
err = PTR_ERR(ring);
- goto err_hws;
+ goto err;
}
/* Ring wraparound at offset 0 sometimes hangs. No idea why. */
@@ -1592,11 +1479,6 @@ static int intel_init_ring_buffer(struct intel_engine_cs *engine)
err_ring:
intel_ring_free(ring);
-err_hws:
- if (HWS_NEEDS_PHYSICAL(engine->i915))
- cleanup_phys_status_page(engine);
- else
- cleanup_status_page(engine);
err:
intel_engine_cleanup_common(engine);
return err;
@@ -1615,11 +1497,6 @@ void intel_engine_cleanup(struct intel_engine_cs *engine)
if (engine->cleanup)
engine->cleanup(engine);
- if (HWS_NEEDS_PHYSICAL(dev_priv))
- cleanup_phys_status_page(engine);
- else
- cleanup_status_page(engine);
-
intel_engine_cleanup_common(engine);
dev_priv->engine[engine->id] = NULL;
--
1.9.1
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