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drm/i915: Keep the CRC values into a circular buffer

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There are a few good properties to a circular buffer, for instance it
has a number of entries (before we were always dumping the full buffer).

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Damien Lespiau
2013-10-15 18:55:29 +01:00
committed by Daniel Vetter
parent 926321d503
commit b2c88f5b1d
3 changed files with 29 additions and 14 deletions
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19
drivers/gpu/drm/i915/i915_irq.c
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@@ -30,6 +30,7 @@
#include <linux/sysrq.h>
#include <linux/slab.h>
#include <linux/circ_buf.h>
#include <drm/drmP.h>
#include <drm/i915_drm.h>
#include "i915_drv.h"
@@ -1195,20 +1196,30 @@ static void ivb_pipe_crc_update(struct drm_device *dev, enum pipe pipe)
struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[pipe];
struct intel_pipe_crc_entry *entry;
ktime_t now;
int ts, slot;
int ts, head, tail;
head = atomic_read(&pipe_crc->head);
tail = atomic_read(&pipe_crc->tail);
if (CIRC_SPACE(head, tail, INTEL_PIPE_CRC_ENTRIES_NR) < 1) {
DRM_ERROR("CRC buffer overflowing\n");
return;
}
entry = &pipe_crc->entries[head];
now = ktime_get();
ts = ktime_to_us(now);
slot = (atomic_read(&pipe_crc->slot) + 1) % INTEL_PIPE_CRC_ENTRIES_NR;
entry = &pipe_crc->entries[slot];
entry->timestamp = ts;
entry->crc[0] = I915_READ(PIPE_CRC_RES_1_IVB(pipe));
entry->crc[1] = I915_READ(PIPE_CRC_RES_2_IVB(pipe));
entry->crc[2] = I915_READ(PIPE_CRC_RES_3_IVB(pipe));
entry->crc[3] = I915_READ(PIPE_CRC_RES_4_IVB(pipe));
entry->crc[4] = I915_READ(PIPE_CRC_RES_5_IVB(pipe));
atomic_set(&dev_priv->pipe_crc[pipe].slot, slot);
head = (head + 1) & (INTEL_PIPE_CRC_ENTRIES_NR - 1);
atomic_set(&pipe_crc->head, head);
}
#else
static void ivb_pipe_crc_update(struct drm_device *dev, int pipe) {}