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powerpc/pseries/htmdump: Add htm flags support to htmdump module

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Under debugfs folder, "/sys/kernel/debug/powerpc/htmdump", add file
"htmflags". Currently supported flag value is to enable/disable
HTM buffer wrap. wrap is used along with "configure" to prevent
HTM buffer from wrapping. Writing 1 will set noWrap while
configuring HTM

Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250420180844.53128-8-atrajeev@linux.ibm.com
This commit is contained in:
Athira Rajeev
2025-04-20 23:38:42 +05:30
committed by Madhavan Srinivasan
parent 78fb17ac68
commit d3f24bf27b
2 changed files with 50 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/include/asm/plpar_wrappers.h
View File

@@ -81,12 +81,12 @@ static inline long htm_call(unsigned long flags, unsigned long target,
param1, param2, param3);
}
static inline long htm_hcall_wrapper(unsigned long nodeindex,
static inline long htm_hcall_wrapper(unsigned long flags, unsigned long nodeindex,
unsigned long nodalchipindex, unsigned long coreindexonchip,
unsigned long type, unsigned long htm_op, unsigned long param1, unsigned long param2,
unsigned long param3)
{
return htm_call(H_HTM_FLAGS_HARDWARE_TARGET,
return htm_call(H_HTM_FLAGS_HARDWARE_TARGET | flags,
H_HTM_TARGET_NODE_INDEX(nodeindex) |
H_HTM_TARGET_NODAL_CHIP_INDEX(nodalchipindex) |
H_HTM_TARGET_CORE_INDEX_ON_CHIP(coreindexonchip),

57
arch/powerpc/platforms/pseries/htmdump.c
View File

@@ -21,10 +21,13 @@ static u32 htmtype;
static u32 htmconfigure;
static u32 htmstart;
static u32 htmsetup;
static u64 htmflags;
static struct dentry *htmdump_debugfs_dir;
#define HTM_ENABLE 1
#define HTM_DISABLE 0
#define HTM_NOWRAP 1
#define HTM_WRAP 0
/*
* Check the return code for H_HTM hcall.
@@ -94,7 +97,7 @@ static ssize_t htmdump_read(struct file *filp, char __user *ubuf,
* - operation as htm dump (H_HTM_OP_DUMP_DATA)
* - last three values are address, size and offset
*/
rc = htm_hcall_wrapper(nodeindex, nodalchipindex, coreindexonchip,
rc = htm_hcall_wrapper(htmflags, nodeindex, nodalchipindex, coreindexonchip,
htmtype, H_HTM_OP_DUMP_DATA, virt_to_phys(htm_buf),
PAGE_SIZE, page);
@@ -119,6 +122,7 @@ static const struct file_operations htmdump_fops = {
static int htmconfigure_set(void *data, u64 val)
{
long rc, ret;
unsigned long param1 = -1, param2 = -1;
/*
* value as 1 : configure HTM.
@@ -129,17 +133,25 @@ static int htmconfigure_set(void *data, u64 val)
/*
* Invoke H_HTM call with:
* - operation as htm configure (H_HTM_OP_CONFIGURE)
* - If htmflags is set, param1 and param2 will be -1
* which is an indicator to use default htm mode reg mask
* and htm mode reg value.
* - last three values are unused, hence set to zero
*/
rc = htm_hcall_wrapper(nodeindex, nodalchipindex, coreindexonchip,
htmtype, H_HTM_OP_CONFIGURE, 0, 0, 0);
if (!htmflags) {
param1 = 0;
param2 = 0;
}
rc = htm_hcall_wrapper(htmflags, nodeindex, nodalchipindex, coreindexonchip,
htmtype, H_HTM_OP_CONFIGURE, param1, param2, 0);
} else if (val == HTM_DISABLE) {
/*
* Invoke H_HTM call with:
* - operation as htm deconfigure (H_HTM_OP_DECONFIGURE)
* - last three values are unused, hence set to zero
*/
rc = htm_hcall_wrapper(nodeindex, nodalchipindex, coreindexonchip,
rc = htm_hcall_wrapper(htmflags, nodeindex, nodalchipindex, coreindexonchip,
htmtype, H_HTM_OP_DECONFIGURE, 0, 0, 0);
} else
return -EINVAL;
@@ -177,7 +189,7 @@ static int htmstart_set(void *data, u64 val)
* - operation as htm start (H_HTM_OP_START)
* - last three values are unused, hence set to zero
*/
rc = htm_hcall_wrapper(nodeindex, nodalchipindex, coreindexonchip,
rc = htm_hcall_wrapper(htmflags, nodeindex, nodalchipindex, coreindexonchip,
htmtype, H_HTM_OP_START, 0, 0, 0);
} else if (val == HTM_DISABLE) {
@@ -186,7 +198,7 @@ static int htmstart_set(void *data, u64 val)
* - operation as htm stop (H_HTM_OP_STOP)
* - last three values are unused, hence set to zero
*/
rc = htm_hcall_wrapper(nodeindex, nodalchipindex, coreindexonchip,
rc = htm_hcall_wrapper(htmflags, nodeindex, nodalchipindex, coreindexonchip,
htmtype, H_HTM_OP_STOP, 0, 0, 0);
} else
return -EINVAL;
@@ -223,7 +235,7 @@ static ssize_t htmstatus_read(struct file *filp, char __user *ubuf,
* - operation as htm status (H_HTM_OP_STATUS)
* - last three values as addr, size and offset
*/
rc = htm_hcall_wrapper(nodeindex, nodalchipindex, coreindexonchip,
rc = htm_hcall_wrapper(htmflags, nodeindex, nodalchipindex, coreindexonchip,
htmtype, H_HTM_OP_STATUS, virt_to_phys(htm_status_buf),
PAGE_SIZE, 0);
@@ -269,7 +281,7 @@ static ssize_t htminfo_read(struct file *filp, char __user *ubuf,
* - operation as htm status (H_HTM_OP_STATUS)
* - last three values as addr, size and offset
*/
rc = htm_hcall_wrapper(nodeindex, nodalchipindex, coreindexonchip,
rc = htm_hcall_wrapper(htmflags, nodeindex, nodalchipindex, coreindexonchip,
htmtype, H_HTM_OP_DUMP_SYSPROC_CONF, virt_to_phys(htm_info_buf),
PAGE_SIZE, 0);
@@ -311,7 +323,7 @@ static int htmsetup_set(void *data, u64 val)
* - parameter 1 set to input value.
* - last two values are unused, hence set to zero
*/
rc = htm_hcall_wrapper(nodeindex, nodalchipindex, coreindexonchip,
rc = htm_hcall_wrapper(htmflags, nodeindex, nodalchipindex, coreindexonchip,
htmtype, H_HTM_OP_SETUP, val, 0, 0);
ret = htm_return_check(rc);
@@ -332,9 +344,35 @@ static int htmsetup_get(void *data, u64 *val)
return 0;
}
static int htmflags_set(void *data, u64 val)
{
/*
* Input value:
* Currently supported flag value is to enable/disable
* HTM buffer wrap. wrap is used along with "configure"
* to prevent HTM buffer from wrapping.
* Writing 1 will set noWrap while configuring HTM
*/
if (val == HTM_NOWRAP)
htmflags = H_HTM_FLAGS_NOWRAP;
else if (val == HTM_WRAP)
htmflags = 0;
else
return -EINVAL;
return 0;
}
static int htmflags_get(void *data, u64 *val)
{
*val = htmflags;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(htmconfigure_fops, htmconfigure_get, htmconfigure_set, "%llu\n");
DEFINE_SIMPLE_ATTRIBUTE(htmstart_fops, htmstart_get, htmstart_set, "%llu\n");
DEFINE_SIMPLE_ATTRIBUTE(htmsetup_fops, htmsetup_get, htmsetup_set, "%llu\n");
DEFINE_SIMPLE_ATTRIBUTE(htmflags_fops, htmflags_get, htmflags_set, "%llu\n");
static int htmdump_init_debugfs(void)
{
@@ -363,6 +401,7 @@ static int htmdump_init_debugfs(void)
debugfs_create_file("htmconfigure", 0600, htmdump_debugfs_dir, NULL, &htmconfigure_fops);
debugfs_create_file("htmstart", 0600, htmdump_debugfs_dir, NULL, &htmstart_fops);
debugfs_create_file("htmsetup", 0600, htmdump_debugfs_dir, NULL, &htmsetup_fops);
debugfs_create_file("htmflags", 0600, htmdump_debugfs_dir, NULL, &htmflags_fops);
/* Debugfs interface file to present status of HTM */
htm_status_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);