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Revert "drm/i915/perf: add a parameter to control the size of OA buffer"
Userspace portion is still missing.
This reverts commit cd956bfcd0.
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Acked-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181116135510.13807-1-joonas.lahtinen@linux.intel.com
This commit is contained in:
Joonas Lahtinen
parent
9e180d9991
commit
fe84168647
@ -2004,7 +2004,6 @@ struct drm_i915_private {
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u32 last_ctx_id;
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int format;
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int format_size;
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int size_exponent;
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/**
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* Locks reads and writes to all head/tail state
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@ -212,7 +212,13 @@
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#include "i915_oa_icl.h"
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#include "intel_lrc_reg.h"
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#define OA_TAKEN(tail, head) (((tail) - (head)) & (dev_priv->perf.oa.oa_buffer.vma->size - 1))
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/* HW requires this to be a power of two, between 128k and 16M, though driver
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* is currently generally designed assuming the largest 16M size is used such
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* that the overflow cases are unlikely in normal operation.
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*/
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#define OA_BUFFER_SIZE SZ_16M
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#define OA_TAKEN(tail, head) ((tail - head) & (OA_BUFFER_SIZE - 1))
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/**
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* DOC: OA Tail Pointer Race
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@ -356,7 +362,6 @@ struct perf_open_properties {
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int oa_format;
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bool oa_periodic;
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int oa_period_exponent;
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u32 oa_buffer_size_exponent;
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};
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static void free_oa_config(struct drm_i915_private *dev_priv,
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@ -519,7 +524,7 @@ static bool oa_buffer_check_unlocked(struct drm_i915_private *dev_priv)
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* could put the tail out of bounds...
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*/
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if (hw_tail >= gtt_offset &&
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hw_tail < (gtt_offset + dev_priv->perf.oa.oa_buffer.vma->size)) {
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hw_tail < (gtt_offset + OA_BUFFER_SIZE)) {
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dev_priv->perf.oa.oa_buffer.tails[!aged_idx].offset =
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aging_tail = hw_tail;
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dev_priv->perf.oa.oa_buffer.aging_timestamp = now;
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@ -648,7 +653,7 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
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int report_size = dev_priv->perf.oa.oa_buffer.format_size;
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u8 *oa_buf_base = dev_priv->perf.oa.oa_buffer.vaddr;
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u32 gtt_offset = i915_ggtt_offset(dev_priv->perf.oa.oa_buffer.vma);
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u32 mask = (dev_priv->perf.oa.oa_buffer.vma->size - 1);
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u32 mask = (OA_BUFFER_SIZE - 1);
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size_t start_offset = *offset;
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unsigned long flags;
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unsigned int aged_tail_idx;
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@ -688,8 +693,8 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
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* only be incremented by multiples of the report size (notably also
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* all a power of two).
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*/
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if (WARN_ONCE(head > dev_priv->perf.oa.oa_buffer.vma->size || head % report_size ||
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tail > dev_priv->perf.oa.oa_buffer.vma->size || tail % report_size,
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if (WARN_ONCE(head > OA_BUFFER_SIZE || head % report_size ||
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tail > OA_BUFFER_SIZE || tail % report_size,
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"Inconsistent OA buffer pointers: head = %u, tail = %u\n",
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head, tail))
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return -EIO;
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@ -712,7 +717,7 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
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* here would imply a driver bug that would result
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* in an overrun.
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*/
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if (WARN_ON((dev_priv->perf.oa.oa_buffer.vma->size - head) < report_size)) {
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if (WARN_ON((OA_BUFFER_SIZE - head) < report_size)) {
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DRM_ERROR("Spurious OA head ptr: non-integral report offset\n");
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break;
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}
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@ -871,6 +876,11 @@ static int gen8_oa_read(struct i915_perf_stream *stream,
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* automatically triggered reports in this condition and so we
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* have to assume that old reports are now being trampled
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* over.
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*
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* Considering how we don't currently give userspace control
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* over the OA buffer size and always configure a large 16MB
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* buffer, then a buffer overflow does anyway likely indicate
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* that something has gone quite badly wrong.
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*/
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if (oastatus & GEN8_OASTATUS_OABUFFER_OVERFLOW) {
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ret = append_oa_status(stream, buf, count, offset,
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@ -932,7 +942,7 @@ static int gen7_append_oa_reports(struct i915_perf_stream *stream,
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int report_size = dev_priv->perf.oa.oa_buffer.format_size;
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u8 *oa_buf_base = dev_priv->perf.oa.oa_buffer.vaddr;
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u32 gtt_offset = i915_ggtt_offset(dev_priv->perf.oa.oa_buffer.vma);
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u32 mask = (dev_priv->perf.oa.oa_buffer.vma->size - 1);
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u32 mask = (OA_BUFFER_SIZE - 1);
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size_t start_offset = *offset;
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unsigned long flags;
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unsigned int aged_tail_idx;
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@ -969,8 +979,8 @@ static int gen7_append_oa_reports(struct i915_perf_stream *stream,
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* only be incremented by multiples of the report size (notably also
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* all a power of two).
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*/
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if (WARN_ONCE(head > dev_priv->perf.oa.oa_buffer.vma->size || head % report_size ||
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tail > dev_priv->perf.oa.oa_buffer.vma->size || tail % report_size,
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if (WARN_ONCE(head > OA_BUFFER_SIZE || head % report_size ||
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tail > OA_BUFFER_SIZE || tail % report_size,
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"Inconsistent OA buffer pointers: head = %u, tail = %u\n",
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head, tail))
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return -EIO;
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@ -990,7 +1000,7 @@ static int gen7_append_oa_reports(struct i915_perf_stream *stream,
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* here would imply a driver bug that would result
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* in an overrun.
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*/
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if (WARN_ON((dev_priv->perf.oa.oa_buffer.vma->size - head) < report_size)) {
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if (WARN_ON((OA_BUFFER_SIZE - head) < report_size)) {
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DRM_ERROR("Spurious OA head ptr: non-integral report offset\n");
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break;
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}
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@ -1385,9 +1395,7 @@ static void gen7_init_oa_buffer(struct drm_i915_private *dev_priv)
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I915_WRITE(GEN7_OABUFFER, gtt_offset);
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I915_WRITE(GEN7_OASTATUS1, gtt_offset |
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((dev_priv->perf.oa.oa_buffer.size_exponent - 17) <<
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GEN7_OASTATUS1_BUFFER_SIZE_SHIFT)); /* tail */
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I915_WRITE(GEN7_OASTATUS1, gtt_offset | OABUFFER_SIZE_16M); /* tail */
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/* Mark that we need updated tail pointers to read from... */
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dev_priv->perf.oa.oa_buffer.tails[0].offset = INVALID_TAIL_PTR;
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@ -1412,8 +1420,7 @@ static void gen7_init_oa_buffer(struct drm_i915_private *dev_priv)
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* the assumption that new reports are being written to zeroed
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* memory...
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*/
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memset(dev_priv->perf.oa.oa_buffer.vaddr, 0,
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dev_priv->perf.oa.oa_buffer.vma->size);
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memset(dev_priv->perf.oa.oa_buffer.vaddr, 0, OA_BUFFER_SIZE);
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/* Maybe make ->pollin per-stream state if we support multiple
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* concurrent streams in the future.
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@ -1443,9 +1450,7 @@ static void gen8_init_oa_buffer(struct drm_i915_private *dev_priv)
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* bit."
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*/
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I915_WRITE(GEN8_OABUFFER, gtt_offset |
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((dev_priv->perf.oa.oa_buffer.size_exponent - 17) <<
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GEN8_OABUFFER_BUFFER_SIZE_SHIFT) |
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GEN8_OABUFFER_MEM_SELECT_GGTT);
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OABUFFER_SIZE_16M | GEN8_OABUFFER_MEM_SELECT_GGTT);
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I915_WRITE(GEN8_OATAILPTR, gtt_offset & GEN8_OATAILPTR_MASK);
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/* Mark that we need updated tail pointers to read from... */
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@ -1473,8 +1478,7 @@ static void gen8_init_oa_buffer(struct drm_i915_private *dev_priv)
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* the assumption that new reports are being written to zeroed
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* memory...
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*/
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memset(dev_priv->perf.oa.oa_buffer.vaddr, 0,
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dev_priv->perf.oa.oa_buffer.vma->size);
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memset(dev_priv->perf.oa.oa_buffer.vaddr, 0, OA_BUFFER_SIZE);
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/*
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* Maybe make ->pollin per-stream state if we support multiple
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@ -1483,24 +1487,23 @@ static void gen8_init_oa_buffer(struct drm_i915_private *dev_priv)
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dev_priv->perf.oa.pollin = false;
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}
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static int alloc_oa_buffer(struct drm_i915_private *dev_priv, int size_exponent)
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static int alloc_oa_buffer(struct drm_i915_private *dev_priv)
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{
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struct drm_i915_gem_object *bo;
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struct i915_vma *vma;
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size_t size = 1U << size_exponent;
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int ret;
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if (WARN_ON(dev_priv->perf.oa.oa_buffer.vma))
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return -ENODEV;
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if (WARN_ON(size < SZ_128K || size > SZ_16M))
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return -EINVAL;
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ret = i915_mutex_lock_interruptible(&dev_priv->drm);
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if (ret)
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return ret;
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bo = i915_gem_object_create(dev_priv, size);
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BUILD_BUG_ON_NOT_POWER_OF_2(OA_BUFFER_SIZE);
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BUILD_BUG_ON(OA_BUFFER_SIZE < SZ_128K || OA_BUFFER_SIZE > SZ_16M);
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bo = i915_gem_object_create(dev_priv, OA_BUFFER_SIZE);
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if (IS_ERR(bo)) {
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DRM_ERROR("Failed to allocate OA buffer\n");
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ret = PTR_ERR(bo);
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@ -1518,7 +1521,6 @@ static int alloc_oa_buffer(struct drm_i915_private *dev_priv, int size_exponent)
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goto err_unref;
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}
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dev_priv->perf.oa.oa_buffer.vma = vma;
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dev_priv->perf.oa.oa_buffer.size_exponent = size_exponent;
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dev_priv->perf.oa.oa_buffer.vaddr =
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i915_gem_object_pin_map(bo, I915_MAP_WB);
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@ -1527,10 +1529,9 @@ static int alloc_oa_buffer(struct drm_i915_private *dev_priv, int size_exponent)
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goto err_unpin;
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}
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DRM_DEBUG_DRIVER("OA Buffer initialized, gtt offset = 0x%x, vaddr = %p, size = %llu\n",
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DRM_DEBUG_DRIVER("OA Buffer initialized, gtt offset = 0x%x, vaddr = %p\n",
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i915_ggtt_offset(dev_priv->perf.oa.oa_buffer.vma),
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dev_priv->perf.oa.oa_buffer.vaddr,
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dev_priv->perf.oa.oa_buffer.vma->size);
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dev_priv->perf.oa.oa_buffer.vaddr);
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goto unlock;
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@ -2090,7 +2091,7 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
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intel_runtime_pm_get(dev_priv);
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intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
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ret = alloc_oa_buffer(dev_priv, props->oa_buffer_size_exponent);
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ret = alloc_oa_buffer(dev_priv);
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if (ret)
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goto err_oa_buf_alloc;
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@ -2649,26 +2650,6 @@ static u64 oa_exponent_to_ns(struct drm_i915_private *dev_priv, int exponent)
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1000ULL * INTEL_INFO(dev_priv)->cs_timestamp_frequency_khz);
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}
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static int
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select_oa_buffer_exponent(struct drm_i915_private *i915,
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u64 requested_size)
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{
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int order;
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/*
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* When no size is specified, use the largest size supported by all
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* generations.
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*/
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if (!requested_size)
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return order_base_2(SZ_16M);
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order = order_base_2(clamp_t(u64, requested_size, SZ_128K, SZ_16M));
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if (requested_size != (1UL << order))
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return -EINVAL;
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return order;
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}
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/**
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* read_properties_unlocked - validate + copy userspace stream open properties
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* @dev_priv: i915 device instance
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@ -2796,14 +2777,6 @@ static int read_properties_unlocked(struct drm_i915_private *dev_priv,
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props->oa_periodic = true;
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props->oa_period_exponent = value;
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break;
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case DRM_I915_PERF_PROP_OA_BUFFER_SIZE:
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ret = select_oa_buffer_exponent(dev_priv, value);
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if (ret < 0) {
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DRM_DEBUG("OA buffer size invalid %llu\n", value);
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return ret;
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}
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props->oa_buffer_size_exponent = ret;
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break;
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case DRM_I915_PERF_PROP_MAX:
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MISSING_CASE(id);
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return -EINVAL;
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@ -2812,12 +2785,6 @@ static int read_properties_unlocked(struct drm_i915_private *dev_priv,
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uprop += 2;
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}
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/* If no buffer size was requested, select the default one. */
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if (!props->oa_buffer_size_exponent) {
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props->oa_buffer_size_exponent =
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select_oa_buffer_exponent(dev_priv, 0);
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}
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return 0;
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}
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@ -586,14 +586,12 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
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#define GEN8_OABUFFER_UDW _MMIO(0x23b4)
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#define GEN8_OABUFFER _MMIO(0x2b14)
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#define GEN8_OABUFFER_MEM_SELECT_GGTT (1 << 0) /* 0: PPGTT, 1: GGTT */
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#define GEN8_OABUFFER_BUFFER_SIZE_SHIFT 3
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#define GEN7_OASTATUS1 _MMIO(0x2364)
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#define GEN7_OASTATUS1_TAIL_MASK 0xffffffc0
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#define GEN7_OASTATUS1_COUNTER_OVERFLOW (1 << 2)
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#define GEN7_OASTATUS1_OABUFFER_OVERFLOW (1 << 1)
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#define GEN7_OASTATUS1_REPORT_LOST (1 << 0)
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#define GEN7_OASTATUS1_BUFFER_SIZE_SHIFT 3
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#define GEN7_OASTATUS2 _MMIO(0x2368)
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#define GEN7_OASTATUS2_HEAD_MASK 0xffffffc0
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@ -1540,13 +1540,6 @@ enum drm_i915_perf_property_id {
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*/
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DRM_I915_PERF_PROP_OA_EXPONENT,
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/**
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* Specify a global OA buffer size to be allocated in bytes. The size
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* specified must be supported by HW (currently supported sizes are
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* powers of 2 ranging from 128Kb to 16Mb).
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*/
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DRM_I915_PERF_PROP_OA_BUFFER_SIZE,
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DRM_I915_PERF_PROP_MAX /* non-ABI */
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};
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