platform/x86: intel_pmc_core: Show Latency Tolerance info

This adds support to show the Latency Tolerance Reporting for the IPs on
the PCH as reported by the PMC. The format shown here is raw LTR data
payload that can further be decoded as per the PCI specification.

This also fixes some minor alignment issues in the header file by
removing spaces and converting to tabs at some places.

Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

1 files changed, 69 insertions, 0 deletions

diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index 6b31d410cb09..54080c0e52fb 100644
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -101,10 +101,35 @@ static const struct pmc_bit_map spt_pfear_map[] = {
 	{},
 };
 
+static const struct pmc_bit_map spt_ltr_show_map[] = {
+	{"SOUTHPORT_A",		SPT_PMC_LTR_SPA},
+	{"SOUTHPORT_B",		SPT_PMC_LTR_SPB},
+	{"SATA",		SPT_PMC_LTR_SATA},
+	{"GIGABIT_ETHERNET",	SPT_PMC_LTR_GBE},
+	{"XHCI",		SPT_PMC_LTR_XHCI},
+	{"ME",			SPT_PMC_LTR_ME},
+	/* EVA is Enterprise Value Add, doesn't really exist on PCH */
+	{"EVA",			SPT_PMC_LTR_EVA},
+	{"SOUTHPORT_C",		SPT_PMC_LTR_SPC},
+	{"HD_AUDIO",		SPT_PMC_LTR_AZ},
+	{"LPSS",		SPT_PMC_LTR_LPSS},
+	{"SOUTHPORT_D",		SPT_PMC_LTR_SPD},
+	{"SOUTHPORT_E",		SPT_PMC_LTR_SPE},
+	{"CAMERA",		SPT_PMC_LTR_CAM},
+	{"ESPI",		SPT_PMC_LTR_ESPI},
+	{"SCC",			SPT_PMC_LTR_SCC},
+	{"ISH",			SPT_PMC_LTR_ISH},
+	/* Below two cannot be used for LTR_IGNORE */
+	{"CURRENT_PLATFORM",	SPT_PMC_LTR_CUR_PLT},
+	{"AGGREGATED_SYSTEM",	SPT_PMC_LTR_CUR_ASLT},
+	{}
+};
+
 static const struct pmc_reg_map spt_reg_map = {
 	.pfear_sts = spt_pfear_map,
 	.mphy_sts = spt_mphy_map,
 	.pll_sts = spt_pll_map,
+	.ltr_show_sts = spt_ltr_show_map,
 	.slp_s0_offset = SPT_PMC_SLP_S0_RES_COUNTER_OFFSET,
 	.ltr_ignore_offset = SPT_PMC_LTR_IGNORE_OFFSET,
 	.regmap_length = SPT_PMC_MMIO_REG_LEN,
@@ -243,10 +268,38 @@ static const struct pmc_bit_map *cnp_slps0_dbg_maps[] = {
 	NULL,
 };
 
+static const struct pmc_bit_map cnp_ltr_show_map[] = {
+	{"SOUTHPORT_A",		CNP_PMC_LTR_SPA},
+	{"SOUTHPORT_B",		CNP_PMC_LTR_SPB},
+	{"SATA",		CNP_PMC_LTR_SATA},
+	{"GIGABIT_ETHERNET",	CNP_PMC_LTR_GBE},
+	{"XHCI",		CNP_PMC_LTR_XHCI},
+	{"ME",			CNP_PMC_LTR_ME},
+	/* EVA is Enterprise Value Add, doesn't really exist on PCH */
+	{"EVA",			CNP_PMC_LTR_EVA},
+	{"SOUTHPORT_C",		CNP_PMC_LTR_SPC},
+	{"HD_AUDIO",		CNP_PMC_LTR_AZ},
+	{"CNV",			CNP_PMC_LTR_CNV},
+	{"LPSS",		CNP_PMC_LTR_LPSS},
+	{"SOUTHPORT_D",		CNP_PMC_LTR_SPD},
+	{"SOUTHPORT_E",		CNP_PMC_LTR_SPE},
+	{"CAMERA",		CNP_PMC_LTR_CAM},
+	{"ESPI",		CNP_PMC_LTR_ESPI},
+	{"SCC",			CNP_PMC_LTR_SCC},
+	{"ISH",			CNP_PMC_LTR_ISH},
+	{"UFSX2",		CNP_PMC_LTR_UFSX2},
+	{"EMMC",		CNP_PMC_LTR_EMMC},
+	/* Below two cannot be used for LTR_IGNORE */
+	{"CURRENT_PLATFORM",	CNP_PMC_LTR_CUR_PLT},
+	{"AGGREGATED_SYSTEM",	CNP_PMC_LTR_CUR_ASLT},
+	{}
+};
+
 static const struct pmc_reg_map cnp_reg_map = {
 	.pfear_sts = cnp_pfear_map,
 	.slp_s0_offset = CNP_PMC_SLP_S0_RES_COUNTER_OFFSET,
 	.slps0_dbg_maps = cnp_slps0_dbg_maps,
+	.ltr_show_sts = cnp_ltr_show_map,
 	.slps0_dbg_offset = CNP_PMC_SLPS0_DBG_OFFSET,
 	.ltr_ignore_offset = CNP_PMC_LTR_IGNORE_OFFSET,
 	.regmap_length = CNP_PMC_MMIO_REG_LEN,
@@ -583,6 +636,20 @@ static int pmc_core_slps0_dbg_show(struct seq_file *s, void *unused)
 }
 DEFINE_SHOW_ATTRIBUTE(pmc_core_slps0_dbg);
 
+static int pmc_core_ltr_show(struct seq_file *s, void *unused)
+{
+	struct pmc_dev *pmcdev = s->private;
+	const struct pmc_bit_map *map = pmcdev->map->ltr_show_sts;
+	int index;
+
+	for (index = 0; map[index].name ; index++) {
+		seq_printf(s, "%-32s\tRAW LTR: 0x%x\n", map[index].name,
+			   pmc_core_reg_read(pmcdev, map[index].bit_mask));
+	}
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(pmc_core_ltr);
+
 static void pmc_core_dbgfs_unregister(struct pmc_dev *pmcdev)
 {
 	debugfs_remove_recursive(pmcdev->dbgfs_dir);
@@ -607,6 +674,8 @@ static int pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
 	debugfs_create_file("ltr_ignore", 0644, dir, pmcdev,
 			    &pmc_core_ltr_ignore_ops);
 
+	debugfs_create_file("ltr_show", 0644, dir, pmcdev, &pmc_core_ltr_fops);
+
 	if (pmcdev->map->pll_sts)
 		debugfs_create_file("pll_status", 0444, dir, pmcdev,
 				    &pmc_core_pll_ops);