提交 59f2c51f 编写于 作者: L Leo Yan 提交者: Ma Wupeng

coresight: tmc-etr: Speed up for bounce buffer in flat mode

mainline inclusion
from mainline-v5.15-rc3
commit 0abd0762
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5YCYK
CVE: NA

Reference: https://lore.kernel.org/r/20210905032144.966766-1-leo.yan@linaro.org

--------------------------------------------------------------------------

The AUX bounce buffer is allocated with API dma_alloc_coherent(), in the
low level's architecture code, e.g. for Arm64, it maps the memory with
the attribution "Normal non-cacheable"; this can be concluded from the
definition for pgprot_dmacoherent() in arch/arm64/include/asm/pgtable.h.

Later when access the AUX bounce buffer, since the memory mapping is
non-cacheable, it's low efficiency due to every load instruction must
reach out DRAM.

This patch changes to allocate pages with dma_alloc_noncoherent(), the
driver can access the memory via cacheable mapping; therefore, load
instructions can fetch data from cache lines rather than always read
data from DRAM, the driver can boost memory performance.  After using
the cacheable mapping, the driver uses dma_sync_single_for_cpu() to
invalidate cacheline prior to read bounce buffer so can avoid read stale
trace data.

By measurement the duration for function tmc_update_etr_buffer() with
ftrace function_graph tracer, it shows the performance significant
improvement for copying 4MiB data from bounce buffer:

  # echo tmc_etr_get_data_flat_buf > set_graph_notrace // avoid noise
  # echo tmc_update_etr_buffer > set_graph_function
  # echo function_graph > current_tracer

  before:

  # CPU  DURATION                  FUNCTION CALLS
  # |     |   |                     |   |   |   |
  2)               |    tmc_update_etr_buffer() {
  ...
  2) # 8148.320 us |    }

  after:

  # CPU  DURATION                  FUNCTION CALLS
  # |     |   |                     |   |   |   |
  2)               |  tmc_update_etr_buffer() {
  ...
  2) # 2525.420 us |  }
Signed-off-by: NLeo Yan <leo.yan@linaro.org>
Reviewed-by: NSuzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20210905032144.966766-1-leo.yan@linaro.orgSigned-off-by: NMathieu Poirier <mathieu.poirier@linaro.org>
上级 450ab8ba
......@@ -609,8 +609,9 @@ static int tmc_etr_alloc_flat_buf(struct tmc_drvdata *drvdata,
if (!flat_buf)
return -ENOMEM;
flat_buf->vaddr = dma_alloc_coherent(real_dev, etr_buf->size,
&flat_buf->daddr, GFP_KERNEL);
flat_buf->vaddr = dma_alloc_noncoherent(real_dev, etr_buf->size,
&flat_buf->daddr,
DMA_FROM_DEVICE, GFP_KERNEL);
if (!flat_buf->vaddr) {
kfree(flat_buf);
return -ENOMEM;
......@@ -631,14 +632,18 @@ static void tmc_etr_free_flat_buf(struct etr_buf *etr_buf)
if (flat_buf && flat_buf->daddr) {
struct device *real_dev = flat_buf->dev->parent;
dma_free_coherent(real_dev, flat_buf->size,
flat_buf->vaddr, flat_buf->daddr);
dma_free_noncoherent(real_dev, etr_buf->size,
flat_buf->vaddr, flat_buf->daddr,
DMA_FROM_DEVICE);
}
kfree(flat_buf);
}
static void tmc_etr_sync_flat_buf(struct etr_buf *etr_buf, u64 rrp, u64 rwp)
{
struct etr_flat_buf *flat_buf = etr_buf->private;
struct device *real_dev = flat_buf->dev->parent;
/*
* Adjust the buffer to point to the beginning of the trace data
* and update the available trace data.
......@@ -648,6 +653,19 @@ static void tmc_etr_sync_flat_buf(struct etr_buf *etr_buf, u64 rrp, u64 rwp)
etr_buf->len = etr_buf->size;
else
etr_buf->len = rwp - rrp;
/*
* The driver always starts tracing at the beginning of the buffer,
* the only reason why we would get a wrap around is when the buffer
* is full. Sync the entire buffer in one go for this case.
*/
if (etr_buf->offset + etr_buf->len > etr_buf->size)
dma_sync_single_for_cpu(real_dev, flat_buf->daddr,
etr_buf->size, DMA_FROM_DEVICE);
else
dma_sync_single_for_cpu(real_dev,
flat_buf->daddr + etr_buf->offset,
etr_buf->len, DMA_FROM_DEVICE);
}
static ssize_t tmc_etr_get_data_flat_buf(struct etr_buf *etr_buf,
......
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