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Date: Tue, 2 Oct 2018 15:07:22 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: "Moger, Babu" <Babu.Moger@....com>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"mingo@...hat.com" <mingo@...hat.com>,
"hpa@...or.com" <hpa@...or.com>,
"fenghua.yu@...el.com" <fenghua.yu@...el.com>,
"vikas.shivappa@...ux.intel.com" <vikas.shivappa@...ux.intel.com>,
"tony.luck@...el.com" <tony.luck@...el.com>
Cc: "x86@...nel.org" <x86@...nel.org>,
"peterz@...radead.org" <peterz@...radead.org>,
"pombredanne@...b.com" <pombredanne@...b.com>,
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"Hurwitz, Sherry" <sherry.hurwitz@....com>,
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"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 07/10] arch/x86: Bring few more functions into the
resource structure
Hi Babu,
On 9/24/2018 12:19 PM, Moger, Babu wrote:
> Bring all resource functions that are different between the vendors
> into resource structure and initialize them dynamically.
>
> Implement these functions separately for each vendors.
> update_mba_bw : Feedback loop bandwidth update functionality is not
> needed for AMD.
> cbm_validate : Cache bitmask validate function. AMD allows
> non-contiguous masks. So, use separate functions for
> Intel and AMD.
>
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---
> arch/x86/kernel/cpu/rdt.c | 17 +++++++++++++----
> arch/x86/kernel/cpu/rdt.h | 19 +++++++++++++------
> arch/x86/kernel/cpu/rdt_ctrlmondata.c | 4 ++--
> arch/x86/kernel/cpu/rdt_monitor.c | 10 +++++++---
> 4 files changed, 35 insertions(+), 15 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/rdt.c b/arch/x86/kernel/cpu/rdt.c
> index 6dec45bf81d6..ae26b9b3fafa 100644
> --- a/arch/x86/kernel/cpu/rdt.c
> +++ b/arch/x86/kernel/cpu/rdt.c
> @@ -867,10 +867,19 @@ static __init void rdt_init_res_defs_intel(void)
> struct rdt_resource *r;
>
> for_each_rdt_resource(r) {
> - if (r->rid == RDT_RESOURCE_MBA) {
> - r->msr_base = IA32_MBA_THRTL_BASE;
> - r->msr_update = mba_wrmsr;
> - r->parse_ctrlval = parse_bw;
> + if ((r->rid == RDT_RESOURCE_L3) ||
> + (r->rid == RDT_RESOURCE_L3DATA) ||
> + (r->rid == RDT_RESOURCE_L3CODE) ||
> + (r->rid == RDT_RESOURCE_L2) ||
> + (r->rid == RDT_RESOURCE_L2DATA) ||
> + (r->rid == RDT_RESOURCE_L2CODE))
> + r->cbm_validate = cbm_validate;
Same comment here about naming as in patch 6. Later cbm_validate_amd
would appear while this remains - to help reduce confusion it may help
to rename this function to cbm_validate_intel at this time.
> +
> + else if (r->rid == RDT_RESOURCE_MBA) {
> + r->msr_base = IA32_MBA_THRTL_BASE;
> + r->msr_update = mba_wrmsr;
> + r->parse_ctrlval = parse_bw;
> + r->update_mba_bw = update_mba_bw;
Same comment about naming.
> }
> }
> }
> diff --git a/arch/x86/kernel/cpu/rdt.h b/arch/x86/kernel/cpu/rdt.h
> index 2569c10c37f4..7205157d359b 100644
> --- a/arch/x86/kernel/cpu/rdt.h
> +++ b/arch/x86/kernel/cpu/rdt.h
> @@ -386,9 +386,9 @@ static inline bool is_mbm_event(int e)
> * struct rdt_resource - attributes of an RDT resource
> * @rid: The index of the resource
> * @alloc_enabled: Is allocation enabled on this machine
> - * @mon_enabled: Is monitoring enabled for this feature
> + * @mon_enabled: Is monitoring enabled for this feature
> * @alloc_capable: Is allocation available on this machine
> - * @mon_capable: Is monitor feature available on this machine
> + * @mon_capable: Is monitor feature available on this machine
> * @name: Name to use in "schemata" file
> * @num_closid: Number of CLOSIDs available
> * @cache_level: Which cache level defines scope of this resource
> @@ -400,10 +400,12 @@ static inline bool is_mbm_event(int e)
> * @cache: Cache allocation related data
> * @format_str: Per resource format string to show domain value
> * @parse_ctrlval: Per resource function pointer to parse control values
> - * @evt_list: List of monitoring events
> - * @num_rmid: Number of RMIDs available
> - * @mon_scale: cqm counter * mon_scale = occupancy in bytes
> - * @fflags: flags to choose base and info files
> + * @update_mba_bw: Feedback loop for MBA software controllerer function
controllerer -> controller ?
> + * @cbm_validate Cache bitmask validate function
> + * @evt_list: List of monitoring events
> + * @num_rmid: Number of RMIDs available
> + * @mon_scale: cqm counter * mon_scale = occupancy in bytes
> + * @fflags: flags to choose base and info files
> */
> struct rdt_resource {
> int rid;
> @@ -425,6 +427,9 @@ struct rdt_resource {
> const char *format_str;
> int (*parse_ctrlval) (void *data, struct rdt_resource *r,
> struct rdt_domain *d);
> + void (*update_mba_bw) (struct rdtgroup *rgrp,
> + struct rdt_domain *dom_mbm);
> + bool (*cbm_validate) (char *buf, u32 *data, struct rdt_resource *r);
> struct list_head evt_list;
> int num_rmid;
> unsigned int mon_scale;
> @@ -562,5 +567,7 @@ void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms);
> void cqm_handle_limbo(struct work_struct *work);
> bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d);
> void __check_limbo(struct rdt_domain *d, bool force_free);
> +void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm);
> +bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r);
>
> #endif /* _ASM_X86_RDT_H */
> diff --git a/arch/x86/kernel/cpu/rdt_ctrlmondata.c b/arch/x86/kernel/cpu/rdt_ctrlmondata.c
> index 0565c564b297..5a282b6c4bd7 100644
> --- a/arch/x86/kernel/cpu/rdt_ctrlmondata.c
> +++ b/arch/x86/kernel/cpu/rdt_ctrlmondata.c
> @@ -88,7 +88,7 @@ int parse_bw(void *_buf, struct rdt_resource *r, struct rdt_domain *d)
> * are allowed (e.g. FFFFH, 0FF0H, 003CH, etc.).
> * Additionally Haswell requires at least two bits set.
> */
> -static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
> +bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
> {
> unsigned long first_bit, zero_bit, val;
> unsigned int cbm_len = r->cache.cbm_len;
> @@ -153,7 +153,7 @@ int parse_cbm(void *_data, struct rdt_resource *r, struct rdt_domain *d)
> return -EINVAL;
> }
>
> - if (!cbm_validate(data->buf, &cbm_val, r))
> + if ((r->cbm_validate) && !(r->cbm_validate(data->buf, &cbm_val, r)))
I do not think you need all of those brackets.
Reinette
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