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From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, maz@kernel.org,
	catalin.marinas@arm.com, mark.rutland@arm.com,
	james.morse@arm.com, anshuman.khandual@arm.com,
	leo.yan@linaro.org, mike.leach@linaro.org,
	mathieu.poirier@linaro.org, will@kernel.org,
	lcherian@marvell.com, coresight@lists.linaro.org,
	Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH v2 14/17] coresight: trbe: Make sure we have enough space
Date: Tue, 21 Sep 2021 14:41:18 +0100	[thread overview]
Message-ID: <20210921134121.2423546-15-suzuki.poulose@arm.com> (raw)
In-Reply-To: <20210921134121.2423546-1-suzuki.poulose@arm.com>

The TRBE driver makes sure that there is enough space for a meaningful
run, otherwise pads the given space and restarts the offset calculation
once. But there is no guarantee that we may find space or hit "no space".
Make sure that we repeat the step until, either :
  - We have the minimum space
   OR
  - There is NO space at all.

Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-trbe.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c
index 3373f4e2183b..02f9e00e2091 100644
--- a/drivers/hwtracing/coresight/coresight-trbe.c
+++ b/drivers/hwtracing/coresight/coresight-trbe.c
@@ -451,10 +451,14 @@ static unsigned long trbe_normal_offset(struct perf_output_handle *handle)
 	 * If the head is too close to the limit and we don't
 	 * have space for a meaningful run, we rather pad it
 	 * and start fresh.
+	 *
+	 * We might have to do this more than once to make sure
+	 * we have enough required space.
 	 */
-	if (limit && ((limit - head) < trbe_min_trace_buf_size(handle))) {
+	while (limit && ((limit - head) < trbe_min_trace_buf_size(handle))) {
 		trbe_pad_buf(handle, limit - head);
 		limit = __trbe_normal_offset(handle);
+		head = PERF_IDX2OFF(handle->head, buf);
 	}
 	return limit;
 }
-- 
2.24.1


  parent reply	other threads:[~2021-09-21 13:42 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-21 13:41 [PATCH v2 00/17] arm64: Self-hosted trace related errata workarounds Suzuki K Poulose
2021-09-21 13:41 ` [PATCH v2 01/17] coresight: trbe: Fix incorrect access of the sink specific data Suzuki K Poulose
2021-09-22  5:41   ` Anshuman Khandual
2021-09-30 17:57   ` Mathieu Poirier
2021-09-21 13:41 ` [PATCH v2 02/17] coresight: trbe: Add infrastructure for Errata handling Suzuki K Poulose
2021-09-22  6:47   ` Anshuman Khandual
2021-10-05 16:46   ` Mathieu Poirier
2021-09-21 13:41 ` [PATCH v2 03/17] coresight: trbe: Add a helper to calculate the trace generated Suzuki K Poulose
2021-09-30 17:54   ` Mathieu Poirier
2021-10-01  8:36     ` Suzuki K Poulose
2021-10-01 15:15       ` Mathieu Poirier
2021-10-01 15:22         ` Suzuki K Poulose
2021-09-21 13:41 ` [PATCH v2 04/17] coresight: trbe: Add a helper to pad a given buffer area Suzuki K Poulose
2021-09-21 13:41 ` [PATCH v2 05/17] coresight: trbe: Decouple buffer base from the hardware base Suzuki K Poulose
2021-09-21 13:41 ` [PATCH v2 06/17] coresight: trbe: Allow driver to choose a different alignment Suzuki K Poulose
2021-09-21 13:41 ` [PATCH v2 07/17] arm64: Add Neoverse-N2, Cortex-A710 CPU part definition Suzuki K Poulose
2021-09-22  6:57   ` Anshuman Khandual
2021-09-21 13:41 ` [PATCH v2 08/17] arm64: Add erratum detection for TRBE overwrite in FILL mode Suzuki K Poulose
2021-09-21 13:41 ` [PATCH v2 09/17] coresight: trbe: Workaround TRBE errata " Suzuki K Poulose
2021-09-23  6:13   ` Anshuman Khandual
2021-09-28 10:40     ` Suzuki K Poulose
2021-10-01  4:21       ` Anshuman Khandual
2021-10-01 17:15   ` Mathieu Poirier
2021-10-04  8:46     ` Suzuki K Poulose
2021-10-04 16:47       ` Mathieu Poirier
2021-09-21 13:41 ` [PATCH v2 10/17] arm64: Enable workaround for TRBE " Suzuki K Poulose
2021-09-22  7:23   ` Anshuman Khandual
2021-09-22  8:11     ` Suzuki K Poulose
2021-10-01  4:35       ` Anshuman Khandual
2021-10-07 16:09   ` Catalin Marinas
2021-09-21 13:41 ` [PATCH v2 11/17] arm64: errata: Add workaround for TSB flush failures Suzuki K Poulose
2021-09-22  7:39   ` Anshuman Khandual
2021-09-22 12:03     ` Suzuki K Poulose
2021-10-01  4:38       ` Anshuman Khandual
2021-10-07 16:10   ` Catalin Marinas
2021-09-21 13:41 ` [PATCH v2 12/17] coresight: trbe: Add a helper to fetch cpudata from perf handle Suzuki K Poulose
2021-09-22  7:59   ` Anshuman Khandual
2021-10-04 17:42   ` Mathieu Poirier
2021-10-05 22:35     ` Suzuki K Poulose
2021-10-06 17:15       ` Mathieu Poirier
2021-10-07  9:18         ` Suzuki K Poulose
2021-09-21 13:41 ` [PATCH v2 13/17] coresight: trbe: Add a helper to determine the minimum buffer size Suzuki K Poulose
2021-09-22  9:51   ` Anshuman Khandual
2021-09-21 13:41 ` Suzuki K Poulose [this message]
2021-09-22  9:58   ` [PATCH v2 14/17] coresight: trbe: Make sure we have enough space Anshuman Khandual
2021-09-22 10:16     ` Suzuki K Poulose
2021-10-01  4:40       ` Anshuman Khandual
2021-09-21 13:41 ` [PATCH v2 15/17] arm64: Add erratum detection for TRBE write to out-of-range Suzuki K Poulose
2021-09-22 10:59   ` Anshuman Khandual
2021-10-07 16:10   ` Catalin Marinas
2021-09-21 13:41 ` [PATCH v2 16/17] coresight: trbe: Work around write to out of range Suzuki K Poulose
2021-09-23  3:15   ` Anshuman Khandual
2021-09-28 10:32     ` Suzuki K Poulose
2021-10-01  4:56       ` Anshuman Khandual
2021-09-21 13:41 ` [PATCH v2 17/17] arm64: Advertise TRBE erratum workaround for write to out-of-range address Suzuki K Poulose
2021-09-22 11:03   ` Anshuman Khandual
2021-10-07 16:11   ` Catalin Marinas
2021-10-05 17:04 ` [PATCH v2 00/17] arm64: Self-hosted trace related errata workarounds Mathieu Poirier
2021-10-08  7:32 ` Will Deacon
2021-10-08  9:25   ` Suzuki K Poulose
2021-10-08  9:52     ` Will Deacon
2021-10-08  9:57       ` Suzuki K Poulose

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