On 24/05/2018 15:54, Lionel Landwerlin wrote:
There are concerns about denial of service around the per context sseu configuration capability. In a previous commit introducing the capability we allowed it only for capable users. This changes adds a new debugfs entry to let any user configure its own context powergating setup. v2: Rename sysfs entry (Tvrtko) Lock interruptible the device in sysfs (Tvrtko) Fix dropped error code in getting dynamic sseu value (Tvrtko) s/dev_priv/i915/ (Tvrtko) Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx> --- drivers/gpu/drm/i915/i915_drv.h | 6 ++++ drivers/gpu/drm/i915/i915_gem_context.c | 47 ++++++++++++++++++++++++- drivers/gpu/drm/i915/i915_sysfs.c | 40 +++++++++++++++++++++ 3 files changed, 92 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 916a301d8c22..3db75c56a9f7 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1842,6 +1842,8 @@ struct drm_i915_private { struct ida hw_ida; #define MAX_CONTEXT_HW_ID (1<<21) /* exclusive */ #define GEN11_MAX_CONTEXT_HW_ID (1<<11) /* exclusive */ + + bool dynamic_sseu; } contexts;u32 fdi_rx_config;@@ -3275,6 +3277,10 @@ i915_gem_context_lookup(struct drm_i915_file_private *file_priv, u32 id) return ctx; }+int i915_gem_contexts_set_dynamic_sseu_locked(struct drm_i915_private *i915,+ bool allowed); +bool i915_gem_contexts_get_dynamic_sseu(struct drm_i915_private *i915); + int i915_perf_open_ioctl(struct drm_device *dev, void *data, struct drm_file *file); int i915_perf_add_config_ioctl(struct drm_device *dev, void *data, diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index 30736efe0fcd..afb7db95aa3b 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -983,7 +983,8 @@ int i915_gem_context_setparam_ioctl(struct drm_device *dev, void *data, break; }- if (!capable(CAP_SYS_ADMIN)) {+ if (!i915->contexts.dynamic_sseu && + !capable(CAP_SYS_ADMIN)) { ret = -EPERM; break; } @@ -1065,6 +1066,50 @@ int i915_gem_context_reset_stats_ioctl(struct drm_device *dev, return ret; }+int i915_gem_contexts_set_dynamic_sseu_locked(struct drm_i915_private *i915,+ bool allowed)
I think you can drop the _locked suffix since we normally only use it when there are two flavours of otherwise the same function name. And you have lockdep_assert_held so that makes it obvious.
+{
+ struct intel_engine_cs *engine = i915->engine[RCS];
+ int ret = 0;
+
+ lockdep_assert_held(&i915->drm.struct_mutex);
+
+ if (!engine->emit_rpcs_config)
+ return -ENODEV;
+
+ /*
+ * When we allow each context to configure its powergating
+ * configuration, there is no need to put the configurations back to
+ * the default, it should already be the case.
+ */
+ if (!allowed) {
Do you want to optimize with "if (!allowed && i915->context.dynamic_sseu)"?
+ struct intel_sseu default_sseu = + intel_sseu_from_device_sseu(&INTEL_INFO(i915)->sseu);
Quick grep around patches tells me this function is always called with the same parameter. Unless I missed something perhaps it would be more readable to rename it to something shorter. Like maybe:
default_sseu = intel_device_default_sseu(i915);Just thinking if that would read nicer than &INTEL_INFO(i915)->sseu everywhere?
Regards, Tvrtko
+ struct i915_gem_context *ctx; + + list_for_each_entry(ctx, &i915->contexts.list, link) { + ret = i915_gem_context_reconfigure_sseu(ctx, engine, + default_sseu); + if (ret) + break; + } + } + + i915->contexts.dynamic_sseu = allowed; + + return ret; +} + +bool i915_gem_contexts_get_dynamic_sseu(struct drm_i915_private *i915) +{ + struct intel_engine_cs *engine = i915->engine[RCS]; + + if (!engine->emit_rpcs_config) + return false; + + return i915->contexts.dynamic_sseu; +} + #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) #include "selftests/mock_context.c" #include "selftests/i915_gem_context.c" diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c index e5e6f6bb2b05..c323cab59ec7 100644 --- a/drivers/gpu/drm/i915/i915_sysfs.c +++ b/drivers/gpu/drm/i915/i915_sysfs.c @@ -483,6 +483,44 @@ static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr return snprintf(buf, PAGE_SIZE, "%d\n", val); }+static ssize_t allow_dynamic_sseu_show(struct device *kdev,+ struct device_attribute *attr, + char *buf) +{ + struct drm_i915_private *i915 = kdev_minor_to_i915(kdev); + bool value = i915_gem_contexts_get_dynamic_sseu(i915); + + return snprintf(buf, PAGE_SIZE, "%d\n", value); +} + +static ssize_t allow_dynamic_sseu_store(struct device *kdev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct drm_i915_private *i915 = kdev_minor_to_i915(kdev); + ssize_t ret; + u32 val; + + ret = kstrtou32(buf, 0, &val); + if (ret) + return ret; + + if (val != 0 && val != 1) + return -EINVAL; + + ret = mutex_lock_interruptible(&i915->drm.struct_mutex); + if (ret) + return ret; + + ret = i915_gem_contexts_set_dynamic_sseu_locked(i915, val != 0); + + mutex_unlock(&i915->drm.struct_mutex); + + return ret ?: count; +} + +static DEVICE_ATTR_RW(allow_dynamic_sseu); + static const struct attribute *gen6_attrs[] = { &dev_attr_gt_act_freq_mhz.attr, &dev_attr_gt_cur_freq_mhz.attr, @@ -492,6 +530,7 @@ static const struct attribute *gen6_attrs[] = { &dev_attr_gt_RP0_freq_mhz.attr, &dev_attr_gt_RP1_freq_mhz.attr, &dev_attr_gt_RPn_freq_mhz.attr, + &dev_attr_allow_dynamic_sseu.attr, NULL, };@@ -505,6 +544,7 @@ static const struct attribute *vlv_attrs[] = {&dev_attr_gt_RP1_freq_mhz.attr, &dev_attr_gt_RPn_freq_mhz.attr, &dev_attr_vlv_rpe_freq_mhz.attr, + &dev_attr_allow_dynamic_sseu.attr, NULL, };
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