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x86/intel_rdt: Fix data type in parsing callbacks 

Each resource is associated with a parsing callback to parse the data
provided from user space when writing schemata file.

The 'data' parameter in the callbacks is defined as a void pointer which
is error prone due to lack of type check.

parse_bw() processes the 'data' parameter as a string while its caller
actually passes the parameter as a pointer to struct rdt_cbm_parse_data.
Thus, parse_bw() takes wrong data and causes failure of parsing MBA
throttle value.

To fix the issue, the 'data' parameter in all parsing callbacks is defined
and handled as a pointer to struct rdt_parse_data (renamed from struct
rdt_cbm_parse_data).

Fixes: 7604df6e16 ("x86/intel_rdt: Support flexible data to parsing callbacks")
Fixes: 9ab9aa15c3 ("x86/intel_rdt: Ensure requested schemata respects mode")
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "H Peter Anvin" <hpa@zytor.com>
Cc: "Tony Luck" <tony.luck@intel.com>
Cc: "Chen Yu" <yu.c.chen@intel.com>
Link: https://lkml.kernel.org/r/1537048707-76280-2-git-send-email-fenghua.yu@intel.com
This commit is contained in:
Xiaochen Shen 2018-09-15 14:58:19 -07:00 committed by Thomas Gleixner
parent 6a1cac56f4
commit 753694a8df
2 changed files with 20 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
arch/x86/kernel/cpu/intel_rdt.h
View File

@ -382,6 +382,11 @@ static inline bool is_mbm_event(int e)
e <= QOS_L3_MBM_LOCAL_EVENT_ID);
}
struct rdt_parse_data {
struct rdtgroup *rdtgrp;
char *buf;
};
/**
* struct rdt_resource - attributes of an RDT resource
* @rid: The index of the resource
@ -423,16 +428,19 @@ struct rdt_resource {
struct rdt_cache cache;
struct rdt_membw membw;
const char *format_str;
int (*parse_ctrlval) (void *data, struct rdt_resource *r,
struct rdt_domain *d);
int (*parse_ctrlval)(struct rdt_parse_data *data,
struct rdt_resource *r,
struct rdt_domain *d);
struct list_head evt_list;
int num_rmid;
unsigned int mon_scale;
unsigned long fflags;
};
int parse_cbm(void *_data, struct rdt_resource *r, struct rdt_domain *d);
int parse_bw(void *_buf, struct rdt_resource *r, struct rdt_domain *d);
int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
struct rdt_domain *d);
int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
struct rdt_domain *d);
extern struct mutex rdtgroup_mutex;

21
arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
View File

@ -64,19 +64,19 @@ static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
return true;
}
int parse_bw(void *_buf, struct rdt_resource *r, struct rdt_domain *d)
int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
struct rdt_domain *d)
{
unsigned long data;
char *buf = _buf;
unsigned long bw_val;
if (d->have_new_ctrl) {
rdt_last_cmd_printf("duplicate domain %d\n", d->id);
return -EINVAL;
}
if (!bw_validate(buf, &data, r))
if (!bw_validate(data->buf, &bw_val, r))
return -EINVAL;
d->new_ctrl = data;
d->new_ctrl = bw_val;
d->have_new_ctrl = true;
return 0;
@ -123,18 +123,13 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
return true;
}
struct rdt_cbm_parse_data {
struct rdtgroup *rdtgrp;
char *buf;
};
/*
* Read one cache bit mask (hex). Check that it is valid for the current
* resource type.
*/
int parse_cbm(void *_data, struct rdt_resource *r, struct rdt_domain *d)
int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
struct rdt_domain *d)
{
struct rdt_cbm_parse_data *data = _data;
struct rdtgroup *rdtgrp = data->rdtgrp;
u32 cbm_val;
@ -195,7 +190,7 @@ int parse_cbm(void *_data, struct rdt_resource *r, struct rdt_domain *d)
static int parse_line(char *line, struct rdt_resource *r,
struct rdtgroup *rdtgrp)
{
struct rdt_cbm_parse_data data;
struct rdt_parse_data data;
char *dom = NULL, *id;
struct rdt_domain *d;
unsigned long dom_id;