[PATCH 16/26] drm/i915: add support for perf configuration queries
Timo Aaltonen
tjaalton at ubuntu.com
Tue May 5 08:32:29 UTC 2020
From: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
BugLink: https://bugs.launchpad.net/bugs/1871957
Listing configurations at the moment is supported only through sysfs.
This might cause issues for applications wanting to list
configurations from a container where sysfs isn't available.
This change adds a way to query the number of configurations and their
content through the i915 query uAPI.
v2: Fix sparse warnings (Lionel)
Add support to query configuration using uuid (Lionel)
v3: Fix some inconsistency in uapi header (Lionel)
Fix unlocking when not locked issue (Lionel)
Add debug messages (Lionel)
v4: Fix missing unlock (Dan)
v5: Drop lock when copying config content to userspace (Chris)
v6: Drop lock when copying config list to userspace (Chris)
Fix deadlock when calling i915_perf_get_oa_config() under
perf.metrics_lock (Lionel)
Add i915_oa_config_get() (Chris)
Link: https://gitlab.freedesktop.org/mesa/mesa/merge_requests/932
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191014201404.22468-2-chris@chris-wilson.co.uk
(cherry picked from commit 4f6ccc74a85cbb4cdd373c374dc76398dc7603a1)
Signed-off-by: Timo Aaltonen <timo.aaltonen at canonical.com>
---
drivers/gpu/drm/i915/i915_perf.c | 3 +-
drivers/gpu/drm/i915/i915_query.c | 296 ++++++++++++++++++++++++++++++
include/uapi/drm/i915_drm.h | 62 ++++++-
3 files changed, 358 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 3f9802a0785b..5d50976318ce 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -3844,8 +3844,7 @@ int i915_perf_remove_config_ioctl(struct drm_device *dev, void *data,
GEM_BUG_ON(*arg != oa_config->id);
- sysfs_remove_group(perf->metrics_kobj,
- &oa_config->sysfs_metric);
+ sysfs_remove_group(perf->metrics_kobj, &oa_config->sysfs_metric);
idr_remove(&perf->metrics_idr, *arg);
diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
index ad9240a0817a..41a4c41a2755 100644
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -7,6 +7,7 @@
#include <linux/nospec.h>
#include "i915_drv.h"
+#include "i915_perf.h"
#include "i915_query.h"
#include <uapi/drm/i915_drm.h>
@@ -142,10 +143,305 @@ query_engine_info(struct drm_i915_private *i915,
return len;
}
+static int can_copy_perf_config_registers_or_number(u32 user_n_regs,
+ u64 user_regs_ptr,
+ u32 kernel_n_regs)
+{
+ /*
+ * We'll just put the number of registers, and won't copy the
+ * register.
+ */
+ if (user_n_regs == 0)
+ return 0;
+
+ if (user_n_regs < kernel_n_regs)
+ return -EINVAL;
+
+ if (!access_ok(u64_to_user_ptr(user_regs_ptr),
+ 2 * sizeof(u32) * kernel_n_regs))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int copy_perf_config_registers_or_number(const struct i915_oa_reg *kernel_regs,
+ u32 kernel_n_regs,
+ u64 user_regs_ptr,
+ u32 *user_n_regs)
+{
+ u32 r;
+
+ if (*user_n_regs == 0) {
+ *user_n_regs = kernel_n_regs;
+ return 0;
+ }
+
+ *user_n_regs = kernel_n_regs;
+
+ for (r = 0; r < kernel_n_regs; r++) {
+ u32 __user *user_reg_ptr =
+ u64_to_user_ptr(user_regs_ptr + sizeof(u32) * r * 2);
+ u32 __user *user_val_ptr =
+ u64_to_user_ptr(user_regs_ptr + sizeof(u32) * r * 2 +
+ sizeof(u32));
+ int ret;
+
+ ret = __put_user(i915_mmio_reg_offset(kernel_regs[r].addr),
+ user_reg_ptr);
+ if (ret)
+ return -EFAULT;
+
+ ret = __put_user(kernel_regs[r].value, user_val_ptr);
+ if (ret)
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+static int query_perf_config_data(struct drm_i915_private *i915,
+ struct drm_i915_query_item *query_item,
+ bool use_uuid)
+{
+ struct drm_i915_query_perf_config __user *user_query_config_ptr =
+ u64_to_user_ptr(query_item->data_ptr);
+ struct drm_i915_perf_oa_config __user *user_config_ptr =
+ u64_to_user_ptr(query_item->data_ptr +
+ sizeof(struct drm_i915_query_perf_config));
+ struct drm_i915_perf_oa_config user_config;
+ struct i915_perf *perf = &i915->perf;
+ struct i915_oa_config *oa_config;
+ char uuid[UUID_STRING_LEN + 1];
+ u64 config_id;
+ u32 flags, total_size;
+ int ret;
+
+ if (!perf->i915)
+ return -ENODEV;
+
+ total_size =
+ sizeof(struct drm_i915_query_perf_config) +
+ sizeof(struct drm_i915_perf_oa_config);
+
+ if (query_item->length == 0)
+ return total_size;
+
+ if (query_item->length < total_size) {
+ DRM_DEBUG("Invalid query config data item size=%u expected=%u\n",
+ query_item->length, total_size);
+ return -EINVAL;
+ }
+
+ if (!access_ok(user_query_config_ptr, total_size))
+ return -EFAULT;
+
+ if (__get_user(flags, &user_query_config_ptr->flags))
+ return -EFAULT;
+
+ if (flags != 0)
+ return -EINVAL;
+
+ if (use_uuid) {
+ struct i915_oa_config *tmp;
+ int id;
+
+ BUILD_BUG_ON(sizeof(user_query_config_ptr->uuid) >= sizeof(uuid));
+
+ memset(&uuid, 0, sizeof(uuid));
+ if (__copy_from_user(uuid, user_query_config_ptr->uuid,
+ sizeof(user_query_config_ptr->uuid)))
+ return -EFAULT;
+
+ oa_config = NULL;
+ rcu_read_lock();
+ idr_for_each_entry(&perf->metrics_idr, tmp, id) {
+ if (!strcmp(tmp->uuid, uuid)) {
+ oa_config = i915_oa_config_get(tmp);
+ break;
+ }
+ }
+ rcu_read_unlock();
+ } else {
+ if (__get_user(config_id, &user_query_config_ptr->config))
+ return -EFAULT;
+
+ oa_config = i915_perf_get_oa_config(perf, config_id);
+ }
+ if (!oa_config)
+ return -ENOENT;
+
+ if (__copy_from_user(&user_config, user_config_ptr,
+ sizeof(user_config))) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ ret = can_copy_perf_config_registers_or_number(user_config.n_boolean_regs,
+ user_config.boolean_regs_ptr,
+ oa_config->b_counter_regs_len);
+ if (ret)
+ goto out;
+
+ ret = can_copy_perf_config_registers_or_number(user_config.n_flex_regs,
+ user_config.flex_regs_ptr,
+ oa_config->flex_regs_len);
+ if (ret)
+ goto out;
+
+ ret = can_copy_perf_config_registers_or_number(user_config.n_mux_regs,
+ user_config.mux_regs_ptr,
+ oa_config->mux_regs_len);
+ if (ret)
+ goto out;
+
+ ret = copy_perf_config_registers_or_number(oa_config->b_counter_regs,
+ oa_config->b_counter_regs_len,
+ user_config.boolean_regs_ptr,
+ &user_config.n_boolean_regs);
+ if (ret)
+ goto out;
+
+ ret = copy_perf_config_registers_or_number(oa_config->flex_regs,
+ oa_config->flex_regs_len,
+ user_config.flex_regs_ptr,
+ &user_config.n_flex_regs);
+ if (ret)
+ goto out;
+
+ ret = copy_perf_config_registers_or_number(oa_config->mux_regs,
+ oa_config->mux_regs_len,
+ user_config.mux_regs_ptr,
+ &user_config.n_mux_regs);
+ if (ret)
+ goto out;
+
+ memcpy(user_config.uuid, oa_config->uuid, sizeof(user_config.uuid));
+
+ if (__copy_to_user(user_config_ptr, &user_config,
+ sizeof(user_config))) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ ret = total_size;
+
+out:
+ i915_oa_config_put(oa_config);
+ return ret;
+}
+
+static size_t sizeof_perf_config_list(size_t count)
+{
+ return sizeof(struct drm_i915_query_perf_config) + sizeof(u64) * count;
+}
+
+static size_t sizeof_perf_metrics(struct i915_perf *perf)
+{
+ struct i915_oa_config *tmp;
+ size_t i;
+ int id;
+
+ i = 1;
+ rcu_read_lock();
+ idr_for_each_entry(&perf->metrics_idr, tmp, id)
+ i++;
+ rcu_read_unlock();
+
+ return sizeof_perf_config_list(i);
+}
+
+static int query_perf_config_list(struct drm_i915_private *i915,
+ struct drm_i915_query_item *query_item)
+{
+ struct drm_i915_query_perf_config __user *user_query_config_ptr =
+ u64_to_user_ptr(query_item->data_ptr);
+ struct i915_perf *perf = &i915->perf;
+ u64 *oa_config_ids = NULL;
+ int alloc, n_configs;
+ u32 flags;
+ int ret;
+
+ if (!perf->i915)
+ return -ENODEV;
+
+ if (query_item->length == 0)
+ return sizeof_perf_metrics(perf);
+
+ if (get_user(flags, &user_query_config_ptr->flags))
+ return -EFAULT;
+
+ if (flags != 0)
+ return -EINVAL;
+
+ n_configs = 1;
+ do {
+ struct i915_oa_config *tmp;
+ u64 *ids;
+ int id;
+
+ ids = krealloc(oa_config_ids,
+ n_configs * sizeof(*oa_config_ids),
+ GFP_KERNEL);
+ if (!ids)
+ return -ENOMEM;
+
+ alloc = fetch_and_zero(&n_configs);
+
+ ids[n_configs++] = 1ull; /* reserved for test_config */
+ rcu_read_lock();
+ idr_for_each_entry(&perf->metrics_idr, tmp, id) {
+ if (n_configs < alloc)
+ ids[n_configs] = id;
+ n_configs++;
+ }
+ rcu_read_unlock();
+
+ oa_config_ids = ids;
+ } while (n_configs > alloc);
+
+ if (query_item->length < sizeof_perf_config_list(n_configs)) {
+ DRM_DEBUG("Invalid query config list item size=%u expected=%zu\n",
+ query_item->length,
+ sizeof_perf_config_list(n_configs));
+ kfree(oa_config_ids);
+ return -EINVAL;
+ }
+
+ if (put_user(n_configs, &user_query_config_ptr->config)) {
+ kfree(oa_config_ids);
+ return -EFAULT;
+ }
+
+ ret = copy_to_user(user_query_config_ptr + 1,
+ oa_config_ids,
+ n_configs * sizeof(*oa_config_ids));
+ kfree(oa_config_ids);
+ if (ret)
+ return -EFAULT;
+
+ return sizeof_perf_config_list(n_configs);
+}
+
+static int query_perf_config(struct drm_i915_private *i915,
+ struct drm_i915_query_item *query_item)
+{
+ switch (query_item->flags) {
+ case DRM_I915_QUERY_PERF_CONFIG_LIST:
+ return query_perf_config_list(i915, query_item);
+ case DRM_I915_QUERY_PERF_CONFIG_DATA_FOR_UUID:
+ return query_perf_config_data(i915, query_item, true);
+ case DRM_I915_QUERY_PERF_CONFIG_DATA_FOR_ID:
+ return query_perf_config_data(i915, query_item, false);
+ default:
+ return -EINVAL;
+ }
+}
+
static int (* const i915_query_funcs[])(struct drm_i915_private *dev_priv,
struct drm_i915_query_item *query_item) = {
query_topology_info,
query_engine_info,
+ query_perf_config,
};
int i915_query_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index ea02b168ac3a..f6b452e79a54 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -2005,6 +2005,7 @@ struct drm_i915_query_item {
__u64 query_id;
#define DRM_I915_QUERY_TOPOLOGY_INFO 1
#define DRM_I915_QUERY_ENGINE_INFO 2
+#define DRM_I915_QUERY_PERF_CONFIG 3
/* Must be kept compact -- no holes and well documented */
/*
@@ -2016,9 +2017,18 @@ struct drm_i915_query_item {
__s32 length;
/*
- * Unused for now. Must be cleared to zero.
+ * When query_id == DRM_I915_QUERY_TOPOLOGY_INFO, must be 0.
+ *
+ * When query_id == DRM_I915_QUERY_PERF_CONFIG, must be one of the
+ * following :
+ * - DRM_I915_QUERY_PERF_CONFIG_LIST
+ * - DRM_I915_QUERY_PERF_CONFIG_DATA_FOR_UUID
+ * - DRM_I915_QUERY_PERF_CONFIG_FOR_UUID
*/
__u32 flags;
+#define DRM_I915_QUERY_PERF_CONFIG_LIST 1
+#define DRM_I915_QUERY_PERF_CONFIG_DATA_FOR_UUID 2
+#define DRM_I915_QUERY_PERF_CONFIG_DATA_FOR_ID 3
/*
* Data will be written at the location pointed by data_ptr when the
@@ -2144,6 +2154,56 @@ struct drm_i915_query_engine_info {
struct drm_i915_engine_info engines[];
};
+/*
+ * Data written by the kernel with query DRM_I915_QUERY_PERF_CONFIG.
+ */
+struct drm_i915_query_perf_config {
+ union {
+ /*
+ * When query_item.flags == DRM_I915_QUERY_PERF_CONFIG_LIST, i915 sets
+ * this fields to the number of configurations available.
+ */
+ __u64 n_configs;
+
+ /*
+ * When query_id == DRM_I915_QUERY_PERF_CONFIG_DATA_FOR_ID,
+ * i915 will use the value in this field as configuration
+ * identifier to decide what data to write into config_ptr.
+ */
+ __u64 config;
+
+ /*
+ * When query_id == DRM_I915_QUERY_PERF_CONFIG_DATA_FOR_UUID,
+ * i915 will use the value in this field as configuration
+ * identifier to decide what data to write into config_ptr.
+ *
+ * String formatted like "%08x-%04x-%04x-%04x-%012x"
+ */
+ char uuid[36];
+ };
+
+ /*
+ * Unused for now. Must be cleared to zero.
+ */
+ __u32 flags;
+
+ /*
+ * When query_item.flags == DRM_I915_QUERY_PERF_CONFIG_LIST, i915 will
+ * write an array of __u64 of configuration identifiers.
+ *
+ * When query_item.flags == DRM_I915_QUERY_PERF_CONFIG_DATA, i915 will
+ * write a struct drm_i915_perf_oa_config. If the following fields of
+ * drm_i915_perf_oa_config are set not set to 0, i915 will write into
+ * the associated pointers the values of submitted when the
+ * configuration was created :
+ *
+ * - n_mux_regs
+ * - n_boolean_regs
+ * - n_flex_regs
+ */
+ __u8 data[];
+};
+
#if defined(__cplusplus)
}
#endif
--
2.25.1
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