linux-kernel - [PATCH v3 4/4] platform/mellanox: mlxbf-pmc: Add support for clock

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Date: Tue, 13 Feb 2024 06:15:28 -0500
From: Shravan Kumar Ramani <shravankr@...dia.com>
To: Hans de Goede <hdegoede@...hat.com>, Ilpo Jarvinen
	<ilpo.jarvinen@...ux.intel.com>, Vadim Pasternak <vadimp@...dia.com>, "David
 Thompson" <davthompson@...dia.com>
CC: Shravan Kumar Ramani <shravankr@...dia.com>,
	<platform-driver-x86@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 4/4] platform/mellanox: mlxbf-pmc: Add support for clock_measure performance block

The HW clock_measure counter info is passed to the driver from ACPI.
Create a new sub-directory for clock_measure events and provide
read access to the user. Writes are blocked since the fields are RO.

Signed-off-by: Shravan Kumar Ramani <shravankr@...dia.com>
Reviewed-by: David Thompson <davthompson@...dia.com>
Reviewed-by: Vadim Pasternak <vadimp@...dia.com>
---
 drivers/platform/mellanox/mlxbf-pmc.c | 46 ++++++++++++++++++++++++---
 1 file changed, 42 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/mellanox/mlxbf-pmc.c b/drivers/platform/mellanox/mlxbf-pmc.c
index e2f11c0c63e9..b14fec062e62 100644
--- a/drivers/platform/mellanox/mlxbf-pmc.c
+++ b/drivers/platform/mellanox/mlxbf-pmc.c
@@ -865,6 +865,37 @@ static const struct mlxbf_pmc_events mlxbf_pmc_llt_miss_events[] = {
 	{75, "HISTOGRAM_HISTOGRAM_BIN9"},
 };
 
+static const struct mlxbf_pmc_events mlxbf_pmc_clock_events[] = {
+	{ 0x0, "FMON_CLK_LAST_COUNT_PLL_D1_INST0" },
+	{ 0x4, "REFERENCE_WINDOW_WIDTH_PLL_D1_INST0" },
+	{ 0x8, "FMON_CLK_LAST_COUNT_PLL_D1_INST1" },
+	{ 0xc, "REFERENCE_WINDOW_WIDTH_PLL_D1_INST1" },
+	{ 0x10, "FMON_CLK_LAST_COUNT_PLL_G1" },
+	{ 0x14, "REFERENCE_WINDOW_WIDTH_PLL_G1" },
+	{ 0x18, "FMON_CLK_LAST_COUNT_PLL_W1" },
+	{ 0x1c, "REFERENCE_WINDOW_WIDTH_PLL_W1" },
+	{ 0x20, "FMON_CLK_LAST_COUNT_PLL_T1" },
+	{ 0x24, "REFERENCE_WINDOW_WIDTH_PLL_T1" },
+	{ 0x28, "FMON_CLK_LAST_COUNT_PLL_A0" },
+	{ 0x2c, "REFERENCE_WINDOW_WIDTH_PLL_A0" },
+	{ 0x30, "FMON_CLK_LAST_COUNT_PLL_C0" },
+	{ 0x34, "REFERENCE_WINDOW_WIDTH_PLL_C0" },
+	{ 0x38, "FMON_CLK_LAST_COUNT_PLL_N1" },
+	{ 0x3c, "REFERENCE_WINDOW_WIDTH_PLL_N1" },
+	{ 0x40, "FMON_CLK_LAST_COUNT_PLL_I1" },
+	{ 0x44, "REFERENCE_WINDOW_WIDTH_PLL_I1" },
+	{ 0x48, "FMON_CLK_LAST_COUNT_PLL_R1" },
+	{ 0x4c, "REFERENCE_WINDOW_WIDTH_PLL_R1" },
+	{ 0x50, "FMON_CLK_LAST_COUNT_PLL_P1" },
+	{ 0x54, "REFERENCE_WINDOW_WIDTH_PLL_P1" },
+	{ 0x58, "FMON_CLK_LAST_COUNT_REF_100_INST0" },
+	{ 0x5c, "REFERENCE_WINDOW_WIDTH_REF_100_INST0" },
+	{ 0x60, "FMON_CLK_LAST_COUNT_REF_100_INST1" },
+	{ 0x64, "REFERENCE_WINDOW_WIDTH_REF_100_INST1" },
+	{ 0x68, "FMON_CLK_LAST_COUNT_REF_156" },
+	{ 0x6c, "REFERENCE_WINDOW_WIDTH_REF_156" },
+};
+
 static struct mlxbf_pmc_context *pmc;
 
 /* UUID used to probe ATF service. */
@@ -1037,6 +1068,9 @@ static const struct mlxbf_pmc_events *mlxbf_pmc_event_list(const char *blk, size
 	} else if (strstr(blk, "llt")) {
 		events = mlxbf_pmc_llt_events;
 		*size = ARRAY_SIZE(mlxbf_pmc_llt_events);
+	} else if (strstr(blk, "clock_measure")) {
+		events = mlxbf_pmc_clock_events;
+		*size = ARRAY_SIZE(mlxbf_pmc_clock_events);
 	} else {
 		events = NULL;
 		*size = 0;
@@ -1463,14 +1497,15 @@ static int mlxbf_pmc_read_event(unsigned int blk_num, u32 cnt_num, bool is_l3, u
 /* Method to read a register */
 static int mlxbf_pmc_read_reg(unsigned int blk_num, u32 offset, u64 *result)
 {
-	u32 ecc_out;
+	u32 reg;
 
-	if (strstr(pmc->block_name[blk_num], "ecc")) {
+	if ((strstr(pmc->block_name[blk_num], "ecc")) ||
+	    (strstr(pmc->block_name[blk_num], "clock_measure"))) {
 		if (mlxbf_pmc_readl(pmc->block[blk_num].mmio_base + offset,
-				    &ecc_out))
+				    &reg))
 			return -EFAULT;
 
-		*result = ecc_out;
+		*result = reg;
 		return 0;
 	}
 
@@ -1484,6 +1519,9 @@ static int mlxbf_pmc_read_reg(unsigned int blk_num, u32 offset, u64 *result)
 /* Method to write to a register */
 static int mlxbf_pmc_write_reg(unsigned int blk_num, u32 offset, u64 data)
 {
+	if (strstr(pmc->block_name[blk_num], "clock_measure"))
+		return -EINVAL;
+
 	if (strstr(pmc->block_name[blk_num], "ecc")) {
 		return mlxbf_pmc_write(pmc->block[blk_num].mmio_base + offset,
 				       MLXBF_PMC_WRITE_REG_32, data);
-- 
2.30.1