Re: [PATCH 6/9] platform/x86: intel_pmc_core: Add requirements file to debugfs
From: David E. Box
Date: Wed Apr 07 2021 - 13:47:26 EST
On Wed, 2021-04-07 at 11:45 -0400, Rajneesh Bhardwaj wrote:
> On Wed, Mar 31, 2021 at 11:06 PM David E. Box
> <david.e.box@xxxxxxxxxxxxxxx> wrote:
> >
> > From: Gayatri Kammela <gayatri.kammela@xxxxxxxxx>
> >
> > Add the debugfs file, substate_requirements, to view the low power
> > mode
> > (LPM) requirements for each enabled mode alongside the last latched
> > status
> > of the condition.
> >
> > After this patch, the new file will look like this:
> >
> > Element | S0i2.0 | S0i3.0 | S0i2.1
> > | S0i3.1 | S0i3.2 | Status |
> > USB2PLL_OFF_STS | Required | Required | Required |
> > Required | Required | |
> > PCIe/USB3.1_Gen2PLL_OFF_STS | Required | Required | Required |
> > Required | Required | |
> > PCIe_Gen3PLL_OFF_STS | Required | Required | Required |
> > Required | Required | Yes |
> > OPIOPLL_OFF_STS | Required | Required | Required |
> > Required | Required | Yes |
> > OCPLL_OFF_STS | Required | Required | Required |
> > Required | Required | Yes |
> > MainPLL_OFF_STS | | Required | |
> > Required | Required | |
> >
> > Signed-off-by: Gayatri Kammela <gayatri.kammela@xxxxxxxxx>
> > Co-developed-by: David E. Box <david.e.box@xxxxxxxxxxxxxxx>
> > Signed-off-by: David E. Box <david.e.box@xxxxxxxxxxxxxxx>
> > ---
> > drivers/platform/x86/intel_pmc_core.c | 86
> > +++++++++++++++++++++++++++
> > 1 file changed, 86 insertions(+)
> >
> > diff --git a/drivers/platform/x86/intel_pmc_core.c
> > b/drivers/platform/x86/intel_pmc_core.c
> > index 0ec26a4c715e..0b47a1da5f49 100644
> > --- a/drivers/platform/x86/intel_pmc_core.c
> > +++ b/drivers/platform/x86/intel_pmc_core.c
> > @@ -1122,6 +1122,86 @@ static int
> > pmc_core_substate_l_sts_regs_show(struct seq_file *s, void *unused)
> > }
> > DEFINE_SHOW_ATTRIBUTE(pmc_core_substate_l_sts_regs);
> >
> > +static void pmc_core_substate_req_header_show(struct seq_file *s)
> > +{
> > + struct pmc_dev *pmcdev = s->private;
> > + int i, mode;
> > +
> > + seq_printf(s, "%30s |", "Element");
> > + pmc_for_each_mode(i, mode, pmcdev)
> > + seq_printf(s, " %9s |", pmc_lpm_modes[mode]);
> > +
> > + seq_printf(s, " %9s |\n", "Status");
> > +}
> > +
> > +static int pmc_core_substate_req_regs_show(struct seq_file *s,
> > void *unused)
> > +{
> > + struct pmc_dev *pmcdev = s->private;
> > + const struct pmc_bit_map **maps = pmcdev->map->lpm_sts;
> > + const struct pmc_bit_map *map;
> > + const int num_maps = pmcdev->map->lpm_num_maps;
> > + u32 sts_offset = pmcdev->map->lpm_status_offset;
> > + u32 *lpm_req_regs = pmcdev->lpm_req_regs;
> > + int mp;
> > +
> > + /* Display the header */
> > + pmc_core_substate_req_header_show(s);
> > +
> > + /* Loop over maps */
> > + for (mp = 0; mp < num_maps; mp++) {
> > + u32 req_mask = 0;
> > + u32 lpm_status;
> > + int mode, idx, i, len = 32;
> > +
> > + /*
> > + * Capture the requirements and create a mask so
> > that we only
> > + * show an element if it's required for at least
> > one of the
> > + * enabled low power modes
> > + */
> > + pmc_for_each_mode(idx, mode, pmcdev)
> > + req_mask |= lpm_req_regs[mp + (mode *
> > num_maps)];
> > +
> > + /* Get the last latched status for this map */
> > + lpm_status = pmc_core_reg_read(pmcdev, sts_offset +
> > (mp * 4));
> > +
> > + /* Loop over elements in this map */
> > + map = maps[mp];
> > + for (i = 0; map[i].name && i < len; i++) {
> > + u32 bit_mask = map[i].bit_mask;
> > +
> > + if (!(bit_mask & req_mask))
> > + /*
> > + * Not required for any enabled
> > states
> > + * so don't display
> > + */
> > + continue;
> > +
> > + /* Display the element name in the first
> > column */
> > + seq_printf(s, "%30s |", map[i].name);
> > +
> > + /* Loop over the enabled states and display
> > if required */
> > + pmc_for_each_mode(idx, mode, pmcdev) {
> > + if (lpm_req_regs[mp + (mode *
> > num_maps)] & bit_mask)
> > + seq_printf(s, " %9s |",
> > + "Required");
> > + else
> > + seq_printf(s, " %9s |", "
> > ");
> > + }
> > +
> > + /* In Status column, show the last captured
> > state of this agent */
> > + if (lpm_status & bit_mask)
> > + seq_printf(s, " %9s |", "Yes");
> > + else
> > + seq_printf(s, " %9s |", " ");
>
> Why is this left blank, maybe NA (Not Available)?
The last column shows that last latched state of that agent. So if
anything it would be "Not Seen". But a blank space makes it visually
easier to parse.
David
>
> > +
> > + seq_puts(s, "\n");
> > + }
> > + }
> > +
> > + return 0;
> > +}
> > +DEFINE_SHOW_ATTRIBUTE(pmc_core_substate_req_regs);
> > +
> > static int pmc_core_pkgc_show(struct seq_file *s, void *unused)
> > {
> > struct pmc_dev *pmcdev = s->private;
> > @@ -1241,6 +1321,12 @@ static void pmc_core_dbgfs_register(struct
> > pmc_dev *pmcdev)
> > pmcdev->dbgfs_dir, pmcdev,
> >
> > &pmc_core_substate_l_sts_regs_fops);
> > }
> > +
> > + if (pmcdev->lpm_req_regs) {
> > + debugfs_create_file("substate_requirements", 0444,
> > + pmcdev->dbgfs_dir, pmcdev,
> > +
> > &pmc_core_substate_req_regs_fops);
> > + }
> > }
> >
> > static const struct x86_cpu_id intel_pmc_core_ids[] = {
> > --
> > 2.25.1
> >
>
>