linux-kernel - Re: [PATCH v3 2/3] platform/x86: intel_pmc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 2 Nov 2018 20:28:52 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     rajneesh.bhardwaj@...ux.intel.com
Cc:     Platform Driver <platform-driver-x86@...r.kernel.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: [PATCH v3 2/3] platform/x86: intel_pmc_core: Fix LTR IGNORE Max offset

On Fri, Nov 2, 2018 at 12:29 PM Rajneesh Bhardwaj
<rajneesh.bhardwaj@...ux.intel.com> wrote:
>
> Cannonlake PCH allows us to ignore LTR from more IPs than Sunrisepoint
> PCH so make the LTR ignore platform specific.
>

This one fine, thanks!

> Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@...ux.intel.com>
> ---
>  drivers/platform/x86/intel_pmc_core.c | 4 +++-
>  drivers/platform/x86/intel_pmc_core.h | 4 +++-
>  2 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
> index 69270888558b..11e8ecde95f0 100644
> --- a/drivers/platform/x86/intel_pmc_core.c
> +++ b/drivers/platform/x86/intel_pmc_core.c
> @@ -148,6 +148,7 @@ static const struct pmc_reg_map spt_reg_map = {
>         .ppfear_buckets = SPT_PPFEAR_NUM_ENTRIES,
>         .pm_cfg_offset = SPT_PMC_PM_CFG_OFFSET,
>         .pm_read_disable_bit = SPT_PMC_READ_DISABLE_BIT,
> +       .ltr_ignore_max = SPT_NUM_IP_IGN_ALLOWED,
>  };
>
>  /* Cannonlake: PGD PFET Enable Ack Status Register(s) bitmap */
> @@ -319,6 +320,7 @@ static const struct pmc_reg_map cnp_reg_map = {
>         .ppfear_buckets = CNP_PPFEAR_NUM_ENTRIES,
>         .pm_cfg_offset = CNP_PMC_PM_CFG_OFFSET,
>         .pm_read_disable_bit = CNP_PMC_READ_DISABLE_BIT,
> +       .ltr_ignore_max = CNP_NUM_IP_IGN_ALLOWED,
>  };
>
>  static inline u8 pmc_core_reg_read_byte(struct pmc_dev *pmcdev, int offset)
> @@ -565,7 +567,7 @@ static ssize_t pmc_core_ltr_ignore_write(struct file *file, const char __user
>                 goto out_unlock;
>         }
>
> -       if (val > NUM_IP_IGN_ALLOWED) {
> +       if (val > map->ltr_ignore_max) {
>                 err = -EINVAL;
>                 goto out_unlock;
>         }
> diff --git a/drivers/platform/x86/intel_pmc_core.h b/drivers/platform/x86/intel_pmc_core.h
> index 7a00436e337d..7f8181057ec8 100644
> --- a/drivers/platform/x86/intel_pmc_core.h
> +++ b/drivers/platform/x86/intel_pmc_core.h
> @@ -44,7 +44,7 @@
>  #define SPT_PMC_READ_DISABLE_BIT               0x16
>  #define SPT_PMC_MSG_FULL_STS_BIT               0x18
>  #define NUM_RETRIES                            100
> -#define NUM_IP_IGN_ALLOWED                     17
> +#define SPT_NUM_IP_IGN_ALLOWED                 17
>
>  #define SPT_PMC_LTR_CUR_PLT                    0x350
>  #define SPT_PMC_LTR_CUR_ASLT                   0x354
> @@ -154,6 +154,7 @@ enum ppfear_regs {
>  #define CNP_PPFEAR_NUM_ENTRIES                 8
>  #define CNP_PMC_READ_DISABLE_BIT               22
>  #define CNP_PMC_LATCH_SLPS0_EVENTS             BIT(31)
> +#define CNP_NUM_IP_IGN_ALLOWED                 19
>  #define CNP_PMC_LTR_CUR_PLT                    0x1B50
>  #define CNP_PMC_LTR_CUR_ASLT                   0x1B54
>  #define CNP_PMC_LTR_SPA                                0x1B60
> @@ -216,6 +217,7 @@ struct pmc_reg_map {
>         const u32 pm_cfg_offset;
>         const int pm_read_disable_bit;
>         const u32 slps0_dbg_offset;
> +       const u32 ltr_ignore_max;
>  };
>
>  /**
> --
> 2.17.1
>


-- 
With Best Regards,
Andy Shevchenko