gpu: nvgpu: vgpu: ecc sysfs support for vgpu

- fetch ecc info from RM server and create sysfs nodes
- new file ecc_vgpu.c for platform-independent code
- add 2 new commands: GET_ECC_INFO and GET_ECC_COUNTER_VALUE

JIRA EVLR-2590

Change-Id: I040a9fcd23326e432ca93e9a028319f9c1c570f0
Signed-off-by: Kyle Guo <kyleg@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1777428
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 93 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/os/linux/vgpu/sysfs_vgpu.c b/drivers/gpu/nvgpu/os/linux/vgpu/sysfs_vgpu.c
index 57aad4b4..30ca7f53 100644
--- a/drivers/gpu/nvgpu/os/linux/vgpu/sysfs_vgpu.c
+++ b/drivers/gpu/nvgpu/os/linux/vgpu/sysfs_vgpu.c
@@ -18,6 +18,8 @@
 #include <nvgpu/vgpu/vgpu.h>
 
 #include "os/linux/platform_gk20a.h"
+#include "os/linux/os_linux.h"
+#include "vgpu/ecc_vgpu.h"
 
 static ssize_t vgpu_load_show(struct device *dev,
                               struct device_attribute *attr,
@@ -38,13 +40,104 @@ static ssize_t vgpu_load_show(struct device *dev,
 }
 static DEVICE_ATTR(load, S_IRUGO, vgpu_load_show, NULL);
 
+static ssize_t vgpu_ecc_stat_show(struct device *dev,
+                              struct device_attribute *attr,
+                              char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct tegra_vgpu_cmd_msg msg = {0};
+        struct tegra_vgpu_ecc_counter_params *p = &msg.params.ecc_counter;
+        struct dev_ext_attribute *ext_attr = container_of(attr,
+                        struct dev_ext_attribute, attr);
+        struct vgpu_ecc_stat *ecc_stat = ext_attr->var;
+        int err;
+
+        p->ecc_id = ecc_stat->ecc_id;
+
+        msg.cmd = TEGRA_VGPU_CMD_GET_ECC_COUNTER_VALUE;
+        msg.handle = vgpu_get_handle(g);
+        err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
+        err = err ? err : msg.ret;
+        if (unlikely(err)) {
+                nvgpu_err(g, "ecc: cannot get ECC counter value: %d", err);
+                return err;
+        }
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", p->value);
+}
+
+static int vgpu_create_ecc_sysfs(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct vgpu_priv_data *priv = vgpu_get_priv_data(g);
+        struct vgpu_ecc_stat *stats;
+        struct dev_ext_attribute *attrs;
+        int err, i, count;
+
+        err = vgpu_ecc_get_info(g);
+        if (unlikely(err)) {
+                nvgpu_err(g, "ecc: cannot get ECC info: %d", err);
+                return err;
+        }
+
+        stats = priv->ecc_stats;
+        count = priv->ecc_stats_count;
+
+        attrs = nvgpu_kzalloc(g, count * sizeof(*attrs));
+        if (unlikely(!attrs)) {
+                nvgpu_err(g, "ecc: no memory");
+                vgpu_ecc_remove_info(g);
+                return -ENOMEM;
+        }
+
+        for (i = 0; i < count; i++) {
+                sysfs_attr_init(&attrs[i].attr);
+                attrs[i].attr.attr.name = stats[i].name;
+                attrs[i].attr.attr.mode = VERIFY_OCTAL_PERMISSIONS(S_IRUGO);
+                attrs[i].attr.show = vgpu_ecc_stat_show;
+                attrs[i].attr.store = NULL;
+                attrs[i].var = &stats[i];
+
+                err = device_create_file(dev, &attrs[i].attr);
+                if (unlikely(err)) {
+                        nvgpu_warn(g, "ecc: cannot create file \"%s\": %d",
+                                   stats[i].name, err);
+                }
+        }
+
+        l->ecc_attrs = attrs;
+        return 0;
+}
+
+static void vgpu_remove_ecc_sysfs(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct vgpu_priv_data *priv = vgpu_get_priv_data(g);
+        int i;
+
+        if (l->ecc_attrs) {
+                for (i = 0; i < priv->ecc_stats_count; i++)
+                        device_remove_file(dev, &l->ecc_attrs[i].attr);
+
+                nvgpu_kfree(g, l->ecc_attrs);
+                l->ecc_attrs = NULL;
+        }
+
+        vgpu_ecc_remove_info(g);
+}
+
 void vgpu_create_sysfs(struct device *dev)
 {
         if (device_create_file(dev, &dev_attr_load))
                 dev_err(dev, "Failed to create vgpu sysfs attributes!\n");
+
+        vgpu_create_ecc_sysfs(dev);
 }
 
 void vgpu_remove_sysfs(struct device *dev)
 {
         device_remove_file(dev, &dev_attr_load);
+        vgpu_remove_ecc_sysfs(dev);
 }