From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
We want to allow userspace to reconfigure the subslice configuration for
its own use case. To do so, we expose a context parameter to allow
adjustment of the RPCS register stored within the context image (and
currently not accessible via LRI). If the context is adjusted before
first use, the adjustment is for "free"; otherwise if the context is
active we flush the context off the GPU (stalling all users) and forcing
the GPU to save the context to memory where we can modify it and so
ensure that the register is reloaded on next execution.
The overhead of managing additional EU subslices can be significant,
especially in multi-context workloads. Non-GPGPU contexts should
preferably disable the subslices it is not using, and others should
fine-tune the number to match their workload.
We expose complete control over the RPCS register, allowing
configuration of slice/subslice, via masks packed into a u64 for
simplicity. For example,
struct drm_i915_gem_context_param arg;
struct drm_i915_gem_context_param_sseu sseu = { .class = 0,
.instance = 0, };
memset(&arg, 0, sizeof(arg));
arg.ctx_id = ctx;
arg.param = I915_CONTEXT_PARAM_SSEU;
arg.value = (uintptr_t) &sseu;
if (drmIoctl(fd, DRM_IOCTL_I915_GEM_CONTEXT_GETPARAM, &arg) == 0) {
sseu.packed.subslice_mask = 0;
drmIoctl(fd, DRM_IOCTL_I915_GEM_CONTEXT_SETPARAM, &arg);
}
could be used to disable all subslices where supported.
v2: Fix offset of CTX_R_PWR_CLK_STATE in intel_lr_context_set_sseu() (Lionel)
v3: Add ability to program this per engine (Chris)
v4: Move most get_sseu() into i915_gem_context.c (Lionel)
v5: Validate sseu configuration against the device's capabilities (Lionel)
v6: Change context powergating settings through MI_SDM on kernel context (Chris)
v7: Synchronize the requests following a powergating setting change using a global
dependency (Chris)
Iterate timelines through dev_priv.gt.active_rings (Tvrtko)
Disable RPCS configuration setting for non capable users (Lionel/Tvrtko)
v8: s/union intel_sseu/struct intel_sseu/ (Lionel)
s/dev_priv/i915/ (Tvrtko)
Change uapi class/instance fields to u16 (Tvrtko)
Bump mask fields to 64bits (Lionel)
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100899
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
c: Dmitry Rogozhkin <dmitry.v.rogozhkin@xxxxxxxxx>
CC: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
CC: Zhipeng Gong <zhipeng.gong@xxxxxxxxx>
CC: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 13 ++
drivers/gpu/drm/i915/i915_gem.c | 2 +
drivers/gpu/drm/i915/i915_gem_context.c | 181 ++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_request.c | 20 +++
drivers/gpu/drm/i915/intel_lrc.c | 103 +++++++++-----
drivers/gpu/drm/i915/intel_ringbuffer.c | 2 +
drivers/gpu/drm/i915/intel_ringbuffer.h | 4 +
include/uapi/drm/i915_drm.h | 43 ++++++
8 files changed, 333 insertions(+), 35 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f491784b2516..916a301d8c22 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2066,6 +2066,12 @@ struct drm_i915_private {
u32 active_requests;
u32 request_serial;
+ /**
+ * Global barrier to ensuring ordering of sseu transitions
+ * requests.
+ */
+ struct i915_gem_active global_barrier;
+
/**
* Is the GPU currently considered idle, or busy executing
* userspace requests? Whilst idle, we allow runtime power
@@ -3228,6 +3234,13 @@ i915_vm_to_ppgtt(struct i915_address_space *vm)
return container_of(vm, struct i915_hw_ppgtt, base);
}
+static inline void i915_gem_set_global_barrier(struct drm_i915_private *i915,
+ struct i915_request *rq)
+{
+ lockdep_assert_held(&i915->drm.struct_mutex);
+ i915_gem_active_set(&i915->gt.global_barrier, rq);
+}
+
/* i915_gem_fence_reg.c */
struct drm_i915_fence_reg *
i915_reserve_fence(struct drm_i915_private *dev_priv);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 03874b50ada9..9c2a0d04bd39 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5548,6 +5548,8 @@ int i915_gem_init_early(struct drm_i915_private *dev_priv)
if (!dev_priv->priorities)
goto err_dependencies;
+ init_request_active(&dev_priv->gt.global_barrier, NULL);
+
INIT_LIST_HEAD(&dev_priv->gt.timelines);
INIT_LIST_HEAD(&dev_priv->gt.active_rings);
INIT_LIST_HEAD(&dev_priv->gt.closed_vma);
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index c5ad468dae56..30736efe0fcd 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -723,6 +723,103 @@ int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
return 0;
}
+static int
+intel_sseu_from_user_sseu(const struct sseu_dev_info *sseu,
+ const struct drm_i915_gem_context_param_sseu *user_sseu,
+ struct intel_sseu *ctx_sseu)
+{
+ if ((user_sseu->slice_mask & ~sseu->slice_mask) != 0 ||
+ user_sseu->slice_mask == 0)
+ return -EINVAL;
+
+ if ((user_sseu->subslice_mask & ~sseu->subslice_mask[0]) != 0 ||
+ user_sseu->subslice_mask == 0)
+ return -EINVAL;
+
+ if (user_sseu->min_eus_per_subslice > sseu->max_eus_per_subslice)
+ return -EINVAL;
+
+ if (user_sseu->max_eus_per_subslice > sseu->max_eus_per_subslice ||
+ user_sseu->max_eus_per_subslice < user_sseu->min_eus_per_subslice ||
+ user_sseu->max_eus_per_subslice == 0)
+ return -EINVAL;
+
+ ctx_sseu->slice_mask = user_sseu->slice_mask;
+ ctx_sseu->subslice_mask = user_sseu->subslice_mask;
+ ctx_sseu->min_eus_per_subslice = user_sseu->min_eus_per_subslice;
+ ctx_sseu->max_eus_per_subslice = user_sseu->max_eus_per_subslice;
+
+ return 0;
+}
+
+static int
+i915_gem_context_reconfigure_sseu(struct i915_gem_context *ctx,
+ struct intel_engine_cs *engine,
+ struct intel_sseu sseu)
+{
+ struct drm_i915_private *i915 = ctx->i915;
+ struct i915_request *rq;
+ struct intel_ring *ring;
+ enum intel_engine_id id;
+ int ret;
+
+ lockdep_assert_held(&i915->drm.struct_mutex);
+
+ /*
+ * First notify user when this capability is not available so that it
+ * can be detected with any valid input.
+ */
+ if (!engine->emit_rpcs_config)
+ return -ENODEV;
+
+ if (memcmp(&to_intel_context(ctx, engine)->sseu,
+ &sseu, sizeof(sseu)) == 0) {
+ return 0;
+ }
+
+ i915_retire_requests(i915);
+
+ /* Now use the RCS to actually reconfigure. */
+ engine = i915->engine[RCS];
+
+ rq = i915_request_alloc(engine, i915->kernel_context);
+ if (IS_ERR(rq))
+ return PTR_ERR(rq);
+
+ ret = engine->emit_rpcs_config(rq, ctx,
+ intel_engine_prepare_sseu(engine, sseu));
+ if (ret) {
+ __i915_request_add(rq, true);
+ return ret;
+ }
+
+ /* Queue this switch after all other activity */
+ list_for_each_entry(ring, &i915->gt.active_rings, active_link) {
+ struct i915_request *prev;
+
+ prev = last_request_on_engine(ring->timeline, engine);
+ if (prev)
+ i915_sw_fence_await_sw_fence_gfp(&rq->submit,
+ &prev->submit,
+ I915_FENCE_GFP);
+ }
+
+ i915_gem_set_global_barrier(i915, rq);
+ __i915_request_add(rq, true);
+
+ /*
+ * Apply the configuration to all engine. Our hardware doesn't
+ * currently support different configurations for each engine.
+ */
+ for_each_engine(engine, i915, id) {
+ struct intel_context *ce = to_intel_context(ctx, engine);
+
+ ce->sseu = sseu;
+ }
+
+ return 0;
+}
+
int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
struct drm_file *file)
{
@@ -760,6 +857,46 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
case I915_CONTEXT_PARAM_PRIORITY:
args->value = ctx->sched.priority;
break;
+ case I915_CONTEXT_PARAM_SSEU:
+ {
+ struct drm_i915_gem_context_param_sseu user_sseu;
+ struct intel_engine_cs *engine;
+ struct intel_context *ce;
+
+ if (copy_from_user(&user_sseu,
+ u64_to_user_ptr(args->value),
+ sizeof(user_sseu))) {
+ ret = -EFAULT;
+ break;
+ }
+
+ if (user_sseu.rsvd1 != 0 || user_sseu.rsvd2 != 0) {
+ ret = -EINVAL;
+ break;
+ }
+
+ engine = intel_engine_lookup_user(to_i915(dev),
+ user_sseu.class,
+ user_sseu.instance);
+ if (!engine) {
+ ret = -EINVAL;
+ break;
+ }
+
+ ce = to_intel_context(ctx, engine);
+
+ user_sseu.slice_mask = ce->sseu.slice_mask;
+ user_sseu.subslice_mask = ce->sseu.subslice_mask;
+ user_sseu.min_eus_per_subslice =
+ ce->sseu.min_eus_per_subslice;
+ user_sseu.max_eus_per_subslice =
+ ce->sseu.max_eus_per_subslice;
+
+ if (copy_to_user(u64_to_user_ptr(args->value),
+ &user_sseu, sizeof(user_sseu)))
+ ret = -EFAULT;
+ break;
+ }
default:
ret = -EINVAL;
break;
@@ -834,7 +971,51 @@ int i915_gem_context_setparam_ioctl(struct drm_device *dev, void *data,
ctx->sched.priority = priority;
}
break;
+ case I915_CONTEXT_PARAM_SSEU:
+ {
+ struct drm_i915_private *i915 = to_i915(dev);
+ struct drm_i915_gem_context_param_sseu user_sseu;
+ struct intel_engine_cs *engine;
+ struct intel_sseu ctx_sseu;
+
+ if (args->size) {
+ ret = -EINVAL;
+ break;
+ }
+
+ if (!capable(CAP_SYS_ADMIN)) {
+ ret = -EPERM;
+ break;
+ }
+ if (copy_from_user(&user_sseu, u64_to_user_ptr(args->value),
+ sizeof(user_sseu))) {
+ ret = -EFAULT;
+ break;
+ }
+
+ if (user_sseu.rsvd1 != 0 || user_sseu.rsvd2 != 0) {
+ ret = -EINVAL;
+ break;
+ }
+
+ engine = intel_engine_lookup_user(i915,
+ user_sseu.class,
+ user_sseu.instance);
+ if (!engine) {
+ ret = -EINVAL;
+ break;
+ }
+
+ ret = intel_sseu_from_user_sseu(&INTEL_INFO(i915)->sseu,
+ &user_sseu, &ctx_sseu);
+ if (ret)
+ break;
+
+ ret = i915_gem_context_reconfigure_sseu(ctx, engine,
+ ctx_sseu);
+ }
+ break;
default:
ret = -EINVAL;
break;
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index fc499bcbd105..9f0b965125c4 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -643,6 +643,22 @@ submit_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
return NOTIFY_DONE;
}
+static int
+i915_request_await_request(struct i915_request *to, struct i915_request *from);
+
+static int add_global_barrier(struct i915_request *rq)
+{
+ struct i915_request *barrier;
+ int ret = 0;
+
+ barrier = i915_gem_active_raw(&rq->i915->gt.global_barrier,
+ &rq->i915->drm.struct_mutex);
+ if (barrier)
+ ret = i915_request_await_request(rq, barrier);
+
+ return ret;
+}
+
/**
* i915_request_alloc - allocate a request structure
*
@@ -804,6 +820,10 @@ i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx)
*/
rq->head = rq->ring->emit;
+ ret = add_global_barrier(rq);
+ if (ret)
+ goto err_unwind;
+
/* Unconditionally invalidate GPU caches and TLBs. */
ret = engine->emit_flush(rq, EMIT_INVALIDATE);
if (ret)
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 2dce2e2bf87d..5d6588fe7ac8 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -2240,6 +2240,72 @@ static void gen8_emit_breadcrumb_rcs(struct i915_request *request, u32 *cs)
}
static const int gen8_emit_breadcrumb_rcs_sz = 8 + WA_TAIL_DWORDS;
+u32 gen8_make_rpcs(const struct sseu_dev_info *sseu,
+ struct intel_sseu ctx_sseu)
+{
+ u32 rpcs = 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 (sseu->has_slice_pg) {
+ rpcs |= GEN8_RPCS_S_CNT_ENABLE;
+ rpcs |= hweight8(ctx_sseu.slice_mask) << GEN8_RPCS_S_CNT_SHIFT;
+ rpcs |= GEN8_RPCS_ENABLE;
+ }
+
+ if (sseu->has_subslice_pg) {
+ rpcs |= GEN8_RPCS_SS_CNT_ENABLE;
+ rpcs |= hweight8(ctx_sseu.subslice_mask) <<
+ GEN8_RPCS_SS_CNT_SHIFT;
+ rpcs |= GEN8_RPCS_ENABLE;
+ }
+
+ if (sseu->has_eu_pg) {
+ rpcs |= ctx_sseu.min_eus_per_subslice <<
+ GEN8_RPCS_EU_MIN_SHIFT;
+ rpcs |= ctx_sseu.max_eus_per_subslice <<
+ GEN8_RPCS_EU_MAX_SHIFT;
+ rpcs |= GEN8_RPCS_ENABLE;
+ }
+
+ return rpcs;
+}
+
+static int gen8_emit_rpcs_config(struct i915_request *rq,
+ struct i915_gem_context *ctx,
+ struct intel_sseu sseu)
+{
+ struct drm_i915_private *i915 = rq->i915;
+ struct intel_context *ce = to_intel_context(ctx, i915->engine[RCS]);
+ u64 offset;
+ u32 *cs;
+
+ /* Let the deferred state allocation take care of this. */
+ if (!ce->state)
+ return 0;
+
+ cs = intel_ring_begin(rq, 4);
+ if (IS_ERR(cs))
+ return PTR_ERR(cs);
+
+ offset = ce->state->node.start +
+ LRC_STATE_PN * PAGE_SIZE +
+ (CTX_R_PWR_CLK_STATE + 1) * 4;
+
+ *cs++ = MI_STORE_DWORD_IMM_GEN4;
+ *cs++ = lower_32_bits(offset);
+ *cs++ = upper_32_bits(offset);
+ *cs++ = gen8_make_rpcs(&INTEL_INFO(i915)->sseu, sseu);
+
+ intel_ring_advance(rq, cs);
+
+ return 0;
+}
+
static int gen8_init_rcs_context(struct i915_request *rq)
{
int ret;
@@ -2333,6 +2399,8 @@ logical_ring_default_vfuncs(struct intel_engine_cs *engine)
engine->emit_breadcrumb = gen8_emit_breadcrumb;
engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_sz;
+ engine->emit_rpcs_config = gen8_emit_rpcs_config;
+
engine->set_default_submission = execlists_set_default_submission;
if (INTEL_GEN(engine->i915) < 11) {
@@ -2481,41 +2549,6 @@ int logical_xcs_ring_init(struct intel_engine_cs *engine)
return logical_ring_init(engine);
}
-u32 gen8_make_rpcs(const struct sseu_dev_info *sseu,
- struct intel_sseu ctx_sseu)
-{
- u32 rpcs = 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 (sseu->has_slice_pg) {
- rpcs |= GEN8_RPCS_S_CNT_ENABLE;
- rpcs |= hweight8(ctx_sseu.slice_mask) << GEN8_RPCS_S_CNT_SHIFT;
- rpcs |= GEN8_RPCS_ENABLE;
- }
-
- if (sseu->has_subslice_pg) {
- rpcs |= GEN8_RPCS_SS_CNT_ENABLE;
- rpcs |= hweight8(ctx_sseu.subslice_mask) <<
- GEN8_RPCS_SS_CNT_SHIFT;
- rpcs |= GEN8_RPCS_ENABLE;
- }
-
- if (sseu->has_eu_pg) {
- rpcs |= ctx_sseu.min_eus_per_subslice <<
- GEN8_RPCS_EU_MIN_SHIFT;
- rpcs |= ctx_sseu.max_eus_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;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 97b38bbb7ce2..50616d0190e9 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2063,6 +2063,8 @@ static void intel_ring_default_vfuncs(struct drm_i915_private *dev_priv,
engine->emit_breadcrumb_sz++;
}
+ engine->emit_rpcs_config = NULL; /* Only supported on Gen8+ */
+
engine->set_default_submission = i9xx_set_default_submission;
if (INTEL_GEN(dev_priv) >= 6)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index acef385c4c80..ab75afdc6fd6 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -456,6 +456,10 @@ struct intel_engine_cs {
void (*emit_breadcrumb)(struct i915_request *rq, u32 *cs);
int emit_breadcrumb_sz;
+ int (*emit_rpcs_config)(struct i915_request *rq,
+ struct i915_gem_context *ctx,
+ struct intel_sseu sseu);
+
/* Pass the request to the hardware queue (e.g. directly into
* the legacy ringbuffer or to the end of an execlist).
*
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 7f5634ce8e88..21df158056a2 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1456,9 +1456,52 @@ struct drm_i915_gem_context_param {
#define I915_CONTEXT_MAX_USER_PRIORITY 1023 /* inclusive */
#define I915_CONTEXT_DEFAULT_PRIORITY 0
#define I915_CONTEXT_MIN_USER_PRIORITY -1023 /* inclusive */
+ /*
+ * When using the following param, value should be a pointer to
+ * drm_i915_gem_context_param_sseu.
+ */
+#define I915_CONTEXT_PARAM_SSEU 0x7
__u64 value;
};
+struct drm_i915_gem_context_param_sseu {
+ /*
+ * Engine class & instance to be configured or queried.
+ */
+ __u16 class;
+ __u16 instance;
+
+ /*
+ * Unused for now. Must be cleared to zero.
+ */
+ __u32 rsvd1;
+
+ /*
+ * Mask of slices to enable for the context. Valid values are a subset
+ * of the bitmask value returned for I915_PARAM_SLICE_MASK.
+ */
+ __u64 slice_mask;
+
+ /*
+ * Mask of subslices to enable for the context. Valid values are a
+ * subset of the bitmask value return by I915_PARAM_SUBSLICE_MASK.
+ */
+ __u64 subslice_mask;
+
+ /*
+ * Minimum/Maximum number of EUs to enable per subslice for the
+ * context. min_eus_per_subslice must be inferior or equal to
+ * max_eus_per_subslice.
+ */
+ __u16 min_eus_per_subslice;
+ __u16 max_eus_per_subslice;
+
+ /*
+ * Unused for now. Must be cleared to zero.
+ */
+ __u32 rsvd2;
+};
+
enum drm_i915_oa_format {
I915_OA_FORMAT_A13 = 1, /* HSW only */
I915_OA_FORMAT_A29, /* HSW only */
--
2.17.0
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