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

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JIRA: https://issues.redhat.com/browse/RHEL-52755

commit 143a2584627cc02af81261c0201f9a69c08241a5
Author: Athira Rajeev <atrajeev@linux.ibm.com>
Date:   Sun Apr 20 23:38:43 2025 +0530

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

    Support dumping HTM capabilities information from Hardware
    Trace Macro (HTM) function via debugfs interface. Under
    debugfs folder "/sys/kernel/debug/powerpc/htmdump", add
    file "htmcaps".

    The interface allows only read of this file which will present the
    content of HTM buffer from the hcall.

    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/20250420180844.53128-9-atrajeev@linux.ibm.com

Signed-off-by: Mamatha Inamdar <minamdar@redhat.com>
This commit is contained in:
Mamatha Inamdar
2025-11-28 04:35:34 -05:00
parent eddef6b2ea
commit 719cff6e90
1 changed files with 40 additions and 0 deletions
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arch/powerpc/platforms/pseries/htmdump.c
+40
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@@ -14,6 +14,7 @@
static void *htm_buf;
static void *htm_status_buf;
static void *htm_info_buf;
static void *htm_caps_buf;
static u32 nodeindex;
static u32 nodalchipindex;
static u32 coreindexonchip;
@@ -304,12 +305,43 @@ static ssize_t htminfo_read(struct file *filp, char __user *ubuf,
return simple_read_from_buffer(ubuf, count, ppos, htm_info_buf, to_copy);
}
static ssize_t htmcaps_read(struct file *filp, char __user *ubuf,
size_t count, loff_t *ppos)
{
void *htm_caps_buf = filp->private_data;
long rc, ret;
/*
* Invoke H_HTM call with:
* - operation as htm capabilities (H_HTM_OP_CAPABILITIES)
* - last three values as addr, size (0x80 for Capabilities Output Buffer
* and zero
*/
rc = htm_hcall_wrapper(htmflags, nodeindex, nodalchipindex, coreindexonchip,
htmtype, H_HTM_OP_CAPABILITIES, virt_to_phys(htm_caps_buf),
0x80, 0);
ret = htm_return_check(rc);
if (ret <= 0) {
pr_debug("H_HTM hcall failed for op: H_HTM_OP_CAPABILITIES, returning %ld\n", ret);
return ret;
}
return simple_read_from_buffer(ubuf, count, ppos, htm_caps_buf, 0x80);
}
static const struct file_operations htminfo_fops = {
.llseek = NULL,
.read = htminfo_read,
.open = simple_open,
};
static const struct file_operations htmcaps_fops = {
.llseek = NULL,
.read = htmcaps_read,
.open = simple_open,
};
static int htmsetup_set(void *data, u64 val)
{
long rc, ret;
@@ -417,8 +449,16 @@ static int htmdump_init_debugfs(void)
return -ENOMEM;
}
/* Debugfs interface file to present HTM capabilities */
htm_caps_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!htm_caps_buf) {
pr_err("Failed to allocate htm caps buf\n");
return -ENOMEM;
}
debugfs_create_file("htmstatus", 0400, htmdump_debugfs_dir, htm_status_buf, &htmstatus_fops);
debugfs_create_file("htminfo", 0400, htmdump_debugfs_dir, htm_info_buf, &htminfo_fops);
debugfs_create_file("htmcaps", 0400, htmdump_debugfs_dir, htm_caps_buf, &htmcaps_fops);
return 0;
}