From 466b179346094e01deccd051a215fe782b59ca68 Mon Sep 17 00:00:00 2001 From: xinhui pan Date: Tue, 7 May 2019 11:53:31 +0800 Subject: [PATCH] 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 Reviewed-by: Alex Deucher Signed-off-by: Alex Deucher --- 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; -- 2.30.2