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From 837f6474ff63321a06124f86904a5805677cc599 Mon Sep 17 00:00:00 2001
From: xinhui pan <xinhui.pan@amd.com>
Date: Tue, 7 May 2019 11:53:31 +0800
Subject: [PATCH 1930/2940] drm/amdgpu: add badpages sysfs interafce
add badpages node.
it will output badpages list in format
gpu pfn : gpu page size : flags
example
0x00000000 : 0x00001000 : R
0x00000001 : 0x00001000 : R
0x00000002 : 0x00001000 : R
0x00000003 : 0x00001000 : R
0x00000004 : 0x00001000 : R
0x00000005 : 0x00001000 : R
0x00000006 : 0x00001000 : R
0x00000007 : 0x00001000 : P
0x00000008 : 0x00001000 : P
0x00000009 : 0x00001000 : P
flags can be one of below characters
R: reserved.
P: pending for reserve.
F: failed to reserve for some reasons.
Signed-off-by: xinhui pan <xinhui.pan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 146 ++++++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h | 1 +
2 files changed, 147 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index 37cb3de08494..49c71cfc7fc6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -90,6 +90,12 @@ struct ras_manager {
struct ras_err_data err_data;
};
+struct ras_badpage {
+ unsigned int bp;
+ unsigned int size;
+ unsigned int flags;
+};
+
const char *ras_error_string[] = {
"none",
"parity",
@@ -710,6 +716,77 @@ int amdgpu_ras_query_error_count(struct amdgpu_device *adev,
/* sysfs begin */
+static int amdgpu_ras_badpages_read(struct amdgpu_device *adev,
+ struct ras_badpage **bps, unsigned int *count);
+
+static char *amdgpu_ras_badpage_flags_str(unsigned int flags)
+{
+ switch (flags) {
+ case 0:
+ return "R";
+ case 1:
+ return "P";
+ case 2:
+ default:
+ return "F";
+ };
+}
+
+/*
+ * DOC: ras sysfs gpu_vram_bad_pages interface
+ *
+ * It allows user to read the bad pages of vram on the gpu through
+ * /sys/class/drm/card[0/1/2...]/device/ras/gpu_vram_bad_pages
+ *
+ * It outputs multiple lines, and each line stands for one gpu page.
+ *
+ * The format of one line is below,
+ * gpu pfn : gpu page size : flags
+ *
+ * gpu pfn and gpu page size are printed in hex format.
+ * flags can be one of below character,
+ * R: reserved, this gpu page is reserved and not able to use.
+ * P: pending for reserve, this gpu page is marked as bad, will be reserved
+ * in next window of page_reserve.
+ * F: unable to reserve. this gpu page can't be reserved due to some reasons.
+ *
+ * examples:
+ * 0x00000001 : 0x00001000 : R
+ * 0x00000002 : 0x00001000 : P
+ */
+
+static ssize_t amdgpu_ras_sysfs_badpages_read(struct file *f,
+ struct kobject *kobj, struct bin_attribute *attr,
+ char *buf, loff_t ppos, size_t count)
+{
+ struct amdgpu_ras *con =
+ container_of(attr, struct amdgpu_ras, badpages_attr);
+ struct amdgpu_device *adev = con->adev;
+ const unsigned int element_size =
+ sizeof("0xabcdabcd : 0x12345678 : R\n") - 1;
+ unsigned int start = (ppos + element_size - 1) / element_size;
+ unsigned int end = (ppos + count - 1) / element_size;
+ ssize_t s = 0;
+ struct ras_badpage *bps = NULL;
+ unsigned int bps_count = 0;
+
+ memset(buf, 0, count);
+
+ if (amdgpu_ras_badpages_read(adev, &bps, &bps_count))
+ return 0;
+
+ for (; start < end && start < bps_count; start++)
+ s += scnprintf(&buf[s], element_size + 1,
+ "0x%08x : 0x%08x : %1s\n",
+ bps[start].bp,
+ bps[start].size,
+ amdgpu_ras_badpage_flags_str(bps[start].flags));
+
+ kfree(bps);
+
+ return s;
+}
+
static ssize_t amdgpu_ras_sysfs_features_read(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -750,9 +827,14 @@ static int amdgpu_ras_sysfs_create_feature_node(struct amdgpu_device *adev)
&con->features_attr.attr,
NULL
};
+ struct bin_attribute *bin_attrs[] = {
+ &con->badpages_attr,
+ NULL
+ };
struct attribute_group group = {
.name = "ras",
.attrs = attrs,
+ .bin_attrs = bin_attrs,
};
con->features_attr = (struct device_attribute) {
@@ -762,7 +844,19 @@ static int amdgpu_ras_sysfs_create_feature_node(struct amdgpu_device *adev)
},
.show = amdgpu_ras_sysfs_features_read,
};
+
+ con->badpages_attr = (struct bin_attribute) {
+ .attr = {
+ .name = "gpu_vram_bad_pages",
+ .mode = S_IRUGO,
+ },
+ .size = 0,
+ .private = NULL,
+ .read = amdgpu_ras_sysfs_badpages_read,
+ };
+
sysfs_attr_init(attrs[0]);
+ sysfs_bin_attr_init(bin_attrs[0]);
return sysfs_create_group(&adev->dev->kobj, &group);
}
@@ -774,9 +868,14 @@ static int amdgpu_ras_sysfs_remove_feature_node(struct amdgpu_device *adev)
&con->features_attr.attr,
NULL
};
+ struct bin_attribute *bin_attrs[] = {
+ &con->badpages_attr,
+ NULL
+ };
struct attribute_group group = {
.name = "ras",
.attrs = attrs,
+ .bin_attrs = bin_attrs,
};
sysfs_remove_group(&adev->dev->kobj, &group);
@@ -1108,6 +1207,53 @@ static int amdgpu_ras_interrupt_remove_all(struct amdgpu_device *adev)
/* ih end */
/* recovery begin */
+
+/* return 0 on success.
+ * caller need free bps.
+ */
+static int amdgpu_ras_badpages_read(struct amdgpu_device *adev,
+ struct ras_badpage **bps, unsigned int *count)
+{
+ struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
+ struct ras_err_handler_data *data;
+ int i = 0;
+ int ret = 0;
+
+ if (!con || !con->eh_data || !bps || !count)
+ return -EINVAL;
+
+ mutex_lock(&con->recovery_lock);
+ data = con->eh_data;
+ if (!data || data->count == 0) {
+ *bps = NULL;
+ goto out;
+ }
+
+ *bps = kmalloc(sizeof(struct ras_badpage) * data->count, GFP_KERNEL);
+ if (!*bps) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ for (; i < data->count; i++) {
+ (*bps)[i] = (struct ras_badpage){
+ .bp = data->bps[i].bp,
+ .size = AMDGPU_GPU_PAGE_SIZE,
+ .flags = 0,
+ };
+
+ if (data->last_reserved <= i)
+ (*bps)[i].flags = 1;
+ else if (data->bps[i].bo == NULL)
+ (*bps)[i].flags = 2;
+ }
+
+ *count = data->count;
+out:
+ mutex_unlock(&con->recovery_lock);
+ return ret;
+}
+
static void amdgpu_ras_do_recovery(struct work_struct *work)
{
struct amdgpu_ras *ras =
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
index 06ef325b61b8..59994ee00855 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
@@ -93,6 +93,7 @@ struct amdgpu_ras {
struct dentry *ent;
/* sysfs */
struct device_attribute features_attr;
+ struct bin_attribute badpages_attr;
/* block array */
struct ras_manager *objs;
--
2.17.1
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