linux-kernel - [PATCH v3] staging: media: atomisp: remove debug sysfs attributes active_bo and free

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Message-Id: <20250624170746.47188-1-abdelrahmanfekry375@gmail.com>
Date: Tue, 24 Jun 2025 20:07:46 +0300
From: Abdelrahman Fekry <abdelrahmanfekry375@...il.com>
To: andy@...nel.org,
	hdegoede@...hat.com,
	mchehab@...nel.org,
	sakari.ailus@...ux.intel.com,
	gregkh@...uxfoundation.org
Cc: linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	linux-staging@...ts.linux.dev,
	skhan@...uxfoundation.org,
	linux-kernel-mentees@...ts.linux.dev,
	dan.carpenter@...aro.org,
	Abdelrahman Fekry <abdelrahmanfekry375@...il.com>
Subject: [PATCH v3] staging: media: atomisp: remove debug sysfs attributes active_bo and free_bo

The sysfs attributes active_bo and free_bo expose internal buffer state used
only for debugging purposes. These are not part of any standard kernel ABI,
and needs to be removed before this driver can be moved out of drivers/staging.

- Remove active_bo and free_bo attributes
- Remove group registeration calls form hmm_init() and hmm_cleanup()

Suggested-by : Hans de Goede <hansg@...nel.org>
Signed-off-by: Abdelrahman Fekry <abdelrahmanfekry375@...il.com>
---
v3:
- remove blank line

v2: https://lore.kernel.org/all/20250624144943.39297-1-abdelrahmanfekry375@gmail.com/
- Add Suggested-by line
- Remove unnecessary comments

v1: https://lore.kernel.org/all/20250624130841.34693-1-abdelrahmanfekry375@gmail.com/

 drivers/staging/media/atomisp/pci/hmm/hmm.c | 92 ---------------------
 1 file changed, 92 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/hmm/hmm.c b/drivers/staging/media/atomisp/pci/hmm/hmm.c
index 84102c3aaf97..469de184b9b8 100644
--- a/drivers/staging/media/atomisp/pci/hmm/hmm.c
+++ b/drivers/staging/media/atomisp/pci/hmm/hmm.c
@@ -28,88 +28,6 @@ struct hmm_bo_device bo_device;
 static ia_css_ptr dummy_ptr = mmgr_EXCEPTION;
 static bool hmm_initialized;

-/*
- * p: private
- * v: vmalloc
- */
-static const char hmm_bo_type_string[] = "pv";
-
-static ssize_t bo_show(struct device *dev, struct device_attribute *attr,
-		       char *buf, struct list_head *bo_list, bool active)
-{
-	ssize_t ret = 0;
-	struct hmm_buffer_object *bo;
-	unsigned long flags;
-	int i;
-	long total[HMM_BO_LAST] = { 0 };
-	long count[HMM_BO_LAST] = { 0 };
-	int index1 = 0;
-	int index2 = 0;
-
-	ret = scnprintf(buf, PAGE_SIZE, "type pgnr\n");
-	if (ret <= 0)
-		return 0;
-
-	index1 += ret;
-
-	spin_lock_irqsave(&bo_device.list_lock, flags);
-	list_for_each_entry(bo, bo_list, list) {
-		if ((active && (bo->status & HMM_BO_ALLOCED)) ||
-		    (!active && !(bo->status & HMM_BO_ALLOCED))) {
-			ret = scnprintf(buf + index1, PAGE_SIZE - index1,
-					"%c %d\n",
-					hmm_bo_type_string[bo->type], bo->pgnr);
-
-			total[bo->type] += bo->pgnr;
-			count[bo->type]++;
-			if (ret > 0)
-				index1 += ret;
-		}
-	}
-	spin_unlock_irqrestore(&bo_device.list_lock, flags);
-
-	for (i = 0; i < HMM_BO_LAST; i++) {
-		if (count[i]) {
-			ret = scnprintf(buf + index1 + index2,
-					PAGE_SIZE - index1 - index2,
-					"%ld %c buffer objects: %ld KB\n",
-					count[i], hmm_bo_type_string[i],
-					total[i] * 4);
-			if (ret > 0)
-				index2 += ret;
-		}
-	}
-
-	/* Add trailing zero, not included by scnprintf */
-	return index1 + index2 + 1;
-}
-
-static ssize_t active_bo_show(struct device *dev, struct device_attribute *attr,
-			      char *buf)
-{
-	return bo_show(dev, attr, buf, &bo_device.entire_bo_list, true);
-}
-
-static ssize_t free_bo_show(struct device *dev, struct device_attribute *attr,
-			    char *buf)
-{
-	return bo_show(dev, attr, buf, &bo_device.entire_bo_list, false);
-}
-
-
-static DEVICE_ATTR_RO(active_bo);
-static DEVICE_ATTR_RO(free_bo);
-
-static struct attribute *sysfs_attrs_ctrl[] = {
-	&dev_attr_active_bo.attr,
-	&dev_attr_free_bo.attr,
-	NULL
-};
-
-static struct attribute_group atomisp_attribute_group[] = {
-	{.attrs = sysfs_attrs_ctrl },
-};
-
 int hmm_init(void)
 {
 	int ret;
@@ -130,14 +48,6 @@ int hmm_init(void)
 	 */
 	dummy_ptr = hmm_alloc(1);

-	if (!ret) {
-		ret = sysfs_create_group(&atomisp_dev->kobj,
-					 atomisp_attribute_group);
-		if (ret)
-			dev_err(atomisp_dev,
-				"%s Failed to create sysfs\n", __func__);
-	}
-
 	return ret;
 }

@@ -145,12 +55,10 @@ void hmm_cleanup(void)
 {
 	if (dummy_ptr == mmgr_EXCEPTION)
 		return;
-	sysfs_remove_group(&atomisp_dev->kobj, atomisp_attribute_group);

 	/* free dummy memory first */
 	hmm_free(dummy_ptr);
 	dummy_ptr = 0;
-
 	hmm_bo_device_exit(&bo_device);
 	hmm_initialized = false;
 }
--
2.25.1