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From: Ashutosh Dixit <ashutosh.dixit@intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: Tilak Tangudu <tilak.tangudu@intel.com>,
	Badal Nilawar <badal.nilawar@intel.com>,
	dri-devel@lists.freedesktop.org,
	Rodrigo Vivi <rodrigo.vivi@intel.com>
Subject: [PATCH 1/3] drm/i915/debugfs: Add perf_limit_reasons in debugfs
Date: Fri,  9 Sep 2022 17:12:00 -0700	[thread overview]
Message-ID: <20220910001202.1733349-2-ashutosh.dixit@intel.com> (raw)
In-Reply-To: <20220910001202.1733349-1-ashutosh.dixit@intel.com>

From: Tilak Tangudu <tilak.tangudu@intel.com>

Add perf_limit_reasons in debugfs. The upper 16 perf_limit_reasons RW "log"
bits are identical to the lower 16 RO "status" bits except that the "log"
bits remain set until cleared, thereby ensuring the throttling occurrence
is not missed. The clear fop clears the upper 16 "log" bits, the get fop
gets all 32 "log" and "status" bits.

v2: Expand commit message and clarify "log" and "status" bits in
    comment (Rodrigo)

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Tilak Tangudu <tilak.tangudu@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c | 31 +++++++++++++++++++
 drivers/gpu/drm/i915/i915_reg.h               |  1 +
 2 files changed, 32 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c b/drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c
index 108b9e76c32e..a009cf69103a 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c
@@ -655,6 +655,36 @@ static bool rps_eval(void *data)
 
 DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(rps_boost);
 
+static int perf_limit_reasons_get(void *data, u64 *val)
+{
+	struct intel_gt *gt = data;
+	intel_wakeref_t wakeref;
+
+	with_intel_runtime_pm(gt->uncore->rpm, wakeref)
+		*val = intel_uncore_read(gt->uncore, GT0_PERF_LIMIT_REASONS);
+
+	return 0;
+}
+
+static int perf_limit_reasons_clear(void *data, u64 val)
+{
+	struct intel_gt *gt = data;
+	intel_wakeref_t wakeref;
+
+	/*
+	 * Clear the upper 16 "log" bits, the lower 16 "status" bits are
+	 * read-only. The upper 16 "log" bits are identical to the lower 16
+	 * "status" bits except that the "log" bits remain set until cleared.
+	 */
+	with_intel_runtime_pm(gt->uncore->rpm, wakeref)
+		intel_uncore_rmw(gt->uncore, GT0_PERF_LIMIT_REASONS,
+				 GT0_PERF_LIMIT_REASONS_LOG_MASK, 0);
+
+	return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(perf_limit_reasons_fops, perf_limit_reasons_get,
+			perf_limit_reasons_clear, "%llu\n");
+
 void intel_gt_pm_debugfs_register(struct intel_gt *gt, struct dentry *root)
 {
 	static const struct intel_gt_debugfs_file files[] = {
@@ -664,6 +694,7 @@ void intel_gt_pm_debugfs_register(struct intel_gt *gt, struct dentry *root)
 		{ "forcewake_user", &forcewake_user_fops, NULL},
 		{ "llc", &llc_fops, llc_eval },
 		{ "rps_boost", &rps_boost_fops, rps_eval },
+		{ "perf_limit_reasons", &perf_limit_reasons_fops, NULL },
 	};
 
 	intel_gt_debugfs_register_files(root, files, ARRAY_SIZE(files), gt);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 52462cbfdc66..58b0ed9dddd5 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1802,6 +1802,7 @@
 #define   POWER_LIMIT_4_MASK		REG_BIT(8)
 #define   POWER_LIMIT_1_MASK		REG_BIT(10)
 #define   POWER_LIMIT_2_MASK		REG_BIT(11)
+#define   GT0_PERF_LIMIT_REASONS_LOG_MASK REG_GENMASK(31, 16)
 
 #define CHV_CLK_CTL1			_MMIO(0x101100)
 #define VLV_CLK_CTL2			_MMIO(0x101104)
-- 
2.34.1


WARNING: multiple messages have this Message-ID (diff)
From: Ashutosh Dixit <ashutosh.dixit@intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org, Rodrigo Vivi <rodrigo.vivi@intel.com>
Subject: [Intel-gfx] [PATCH 1/3] drm/i915/debugfs: Add perf_limit_reasons in debugfs
Date: Fri,  9 Sep 2022 17:12:00 -0700	[thread overview]
Message-ID: <20220910001202.1733349-2-ashutosh.dixit@intel.com> (raw)
In-Reply-To: <20220910001202.1733349-1-ashutosh.dixit@intel.com>

From: Tilak Tangudu <tilak.tangudu@intel.com>

Add perf_limit_reasons in debugfs. The upper 16 perf_limit_reasons RW "log"
bits are identical to the lower 16 RO "status" bits except that the "log"
bits remain set until cleared, thereby ensuring the throttling occurrence
is not missed. The clear fop clears the upper 16 "log" bits, the get fop
gets all 32 "log" and "status" bits.

v2: Expand commit message and clarify "log" and "status" bits in
    comment (Rodrigo)

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Tilak Tangudu <tilak.tangudu@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c | 31 +++++++++++++++++++
 drivers/gpu/drm/i915/i915_reg.h               |  1 +
 2 files changed, 32 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c b/drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c
index 108b9e76c32e..a009cf69103a 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c
@@ -655,6 +655,36 @@ static bool rps_eval(void *data)
 
 DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(rps_boost);
 
+static int perf_limit_reasons_get(void *data, u64 *val)
+{
+	struct intel_gt *gt = data;
+	intel_wakeref_t wakeref;
+
+	with_intel_runtime_pm(gt->uncore->rpm, wakeref)
+		*val = intel_uncore_read(gt->uncore, GT0_PERF_LIMIT_REASONS);
+
+	return 0;
+}
+
+static int perf_limit_reasons_clear(void *data, u64 val)
+{
+	struct intel_gt *gt = data;
+	intel_wakeref_t wakeref;
+
+	/*
+	 * Clear the upper 16 "log" bits, the lower 16 "status" bits are
+	 * read-only. The upper 16 "log" bits are identical to the lower 16
+	 * "status" bits except that the "log" bits remain set until cleared.
+	 */
+	with_intel_runtime_pm(gt->uncore->rpm, wakeref)
+		intel_uncore_rmw(gt->uncore, GT0_PERF_LIMIT_REASONS,
+				 GT0_PERF_LIMIT_REASONS_LOG_MASK, 0);
+
+	return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(perf_limit_reasons_fops, perf_limit_reasons_get,
+			perf_limit_reasons_clear, "%llu\n");
+
 void intel_gt_pm_debugfs_register(struct intel_gt *gt, struct dentry *root)
 {
 	static const struct intel_gt_debugfs_file files[] = {
@@ -664,6 +694,7 @@ void intel_gt_pm_debugfs_register(struct intel_gt *gt, struct dentry *root)
 		{ "forcewake_user", &forcewake_user_fops, NULL},
 		{ "llc", &llc_fops, llc_eval },
 		{ "rps_boost", &rps_boost_fops, rps_eval },
+		{ "perf_limit_reasons", &perf_limit_reasons_fops, NULL },
 	};
 
 	intel_gt_debugfs_register_files(root, files, ARRAY_SIZE(files), gt);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 52462cbfdc66..58b0ed9dddd5 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1802,6 +1802,7 @@
 #define   POWER_LIMIT_4_MASK		REG_BIT(8)
 #define   POWER_LIMIT_1_MASK		REG_BIT(10)
 #define   POWER_LIMIT_2_MASK		REG_BIT(11)
+#define   GT0_PERF_LIMIT_REASONS_LOG_MASK REG_GENMASK(31, 16)
 
 #define CHV_CLK_CTL1			_MMIO(0x101100)
 #define VLV_CLK_CTL2			_MMIO(0x101104)
-- 
2.34.1


  reply	other threads:[~2022-09-10  0:12 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-10  0:11 [PATCH 0/3] i915: freq caps and perf_limit_reasons changes for MTL Ashutosh Dixit
2022-09-10  0:11 ` [Intel-gfx] " Ashutosh Dixit
2022-09-10  0:12 ` Ashutosh Dixit [this message]
2022-09-10  0:12   ` [Intel-gfx] [PATCH 1/3] drm/i915/debugfs: Add perf_limit_reasons in debugfs Ashutosh Dixit
2022-09-10  0:12 ` [PATCH 2/3] drm/i915/mtl: PERF_LIMIT_REASONS changes for MTL Ashutosh Dixit
2022-09-10  0:12   ` [Intel-gfx] " Ashutosh Dixit
2022-09-10  0:12 ` [PATCH 3/3] drm/i915/rps: Freq caps " Ashutosh Dixit
2022-09-10  0:12   ` [Intel-gfx] " Ashutosh Dixit
2022-09-10  0:44 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for i915: freq caps and perf_limit_reasons changes for MTL (rev4) Patchwork
2022-09-10  1:06 ` [Intel-gfx] ✗ Fi.CI.BAT: failure " Patchwork

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