Add the helpers to save and restore IDXD device configurations.
These helpers will be called during Function Level Reset (FLR) processing.
Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
---
Change log:
v2:
- Call a helper idxd_free_saved() to free all saved configs (Dave Jiang).
- Replace defined bitmap free function with existing bitmpa_free().
drivers/dma/idxd/idxd.h | 11 ++
drivers/dma/idxd/init.c | 225 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 236 insertions(+)
diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
index 1f93dd6db28f..8b381a1fb259 100644
--- a/drivers/dma/idxd/idxd.h
+++ b/drivers/dma/idxd/idxd.h
@@ -374,6 +374,17 @@ struct idxd_device {
struct dentry *dbgfs_evl_file;
bool user_submission_safe;
+
+ struct idxd_saved_states *idxd_saved;
+};
+
+struct idxd_saved_states {
+ struct idxd_device saved_idxd;
+ struct idxd_evl saved_evl;
+ struct idxd_engine **saved_engines;
+ struct idxd_wq **saved_wqs;
+ struct idxd_group **saved_groups;
+ unsigned long *saved_wq_enable_map;
};
static inline unsigned int evl_ent_size(struct idxd_device *idxd)
diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index a76ec4312a94..da5b76a1e208 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -756,6 +756,231 @@ static void idxd_unbind(struct device_driver *drv, const char *buf)
put_device(dev);
}
+#define idxd_free_saved_configs(saved_configs, count) \
+ do { \
+ int i; \
+ \
+ for (i = 0; i < (count); i++) \
+ kfree(saved_configs[i]); \
+ } while (0)
+
+static void idxd_free_saved(struct idxd_group **saved_groups,
+ struct idxd_engine **saved_engines,
+ struct idxd_wq **saved_wqs,
+ struct idxd_device *idxd)
+{
+ if (saved_groups)
+ idxd_free_saved_configs(saved_groups, idxd->max_groups);
+ if (saved_engines)
+ idxd_free_saved_configs(saved_engines, idxd->max_engines);
+ if (saved_wqs)
+ idxd_free_saved_configs(saved_wqs, idxd->max_wqs);
+}
+
+/*
+ * Save IDXD device configurations including engines, groups, wqs etc.
+ * The saved configurations can be restored when needed.
+ */
+static int idxd_device_config_save(struct idxd_device *idxd,
+ struct idxd_saved_states *idxd_saved)
+{
+ struct device *dev = &idxd->pdev->dev;
+ int i;
+
+ memcpy(&idxd_saved->saved_idxd, idxd, sizeof(*idxd));
+
+ if (idxd->evl) {
+ memcpy(&idxd_saved->saved_evl, idxd->evl,
+ sizeof(struct idxd_evl));
+ }
+
+ struct idxd_group **saved_groups __free(kfree) =
+ kcalloc_node(idxd->max_groups,
+ sizeof(struct idxd_group *),
+ GFP_KERNEL, dev_to_node(dev));
+ if (!saved_groups)
+ return -ENOMEM;
+
+ for (i = 0; i < idxd->max_groups; i++) {
+ struct idxd_group *saved_group __free(kfree) =
+ kzalloc_node(sizeof(*saved_group), GFP_KERNEL,
+ dev_to_node(dev));
+
+ if (!saved_group) {
+ /* Free saved groups */
+ idxd_free_saved(saved_groups, NULL, NULL, idxd);
+
+ return -ENOMEM;
+ }
+
+ memcpy(saved_group, idxd->groups[i], sizeof(*saved_group));
+ saved_groups[i] = no_free_ptr(saved_group);
+ }
+
+ struct idxd_engine **saved_engines =
+ kcalloc_node(idxd->max_engines,
+ sizeof(struct idxd_engine *),
+ GFP_KERNEL, dev_to_node(dev));
+ if (!saved_engines) {
+ /* Free saved groups */
+ idxd_free_saved(saved_groups, NULL, NULL, idxd);
+
+ return -ENOMEM;
+ }
+ for (i = 0; i < idxd->max_engines; i++) {
+ struct idxd_engine *saved_engine __free(kfree) =
+ kzalloc_node(sizeof(*saved_engine), GFP_KERNEL,
+ dev_to_node(dev));
+ if (!saved_engine) {
+ /* Free saved groups and engines */
+ idxd_free_saved(saved_groups, saved_engines, NULL,
+ idxd);
+
+ return -ENOMEM;
+ }
+
+ memcpy(saved_engine, idxd->engines[i], sizeof(*saved_engine));
+ saved_engines[i] = no_free_ptr(saved_engine);
+ }
+
+ unsigned long *saved_wq_enable_map __free(bitmap) =
+ bitmap_zalloc_node(idxd->max_wqs, GFP_KERNEL,
+ dev_to_node(dev));
+ if (!saved_wq_enable_map) {
+ /* Free saved groups and engines */
+ idxd_free_saved(saved_groups, saved_engines, NULL, idxd);
+
+ return -ENOMEM;
+ }
+
+ bitmap_copy(saved_wq_enable_map, idxd->wq_enable_map, idxd->max_wqs);
+
+ struct idxd_wq **saved_wqs __free(kfree) =
+ kcalloc_node(idxd->max_wqs, sizeof(struct idxd_wq *),
+ GFP_KERNEL, dev_to_node(dev));
+ if (!saved_wqs) {
+ /* Free saved groups and engines */
+ idxd_free_saved(saved_groups, saved_engines, NULL, idxd);
+
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < idxd->max_wqs; i++) {
+ struct idxd_wq *saved_wq __free(kfree) =
+ kzalloc_node(sizeof(*saved_wq), GFP_KERNEL,
+ dev_to_node(dev));
+ struct idxd_wq *wq;
+
+ if (!saved_wq) {
+ /* Free saved groups, engines, and wqs */
+ idxd_free_saved(saved_groups, saved_engines, saved_wqs,
+ idxd);
+
+ return -ENOMEM;
+ }
+
+ if (!test_bit(i, saved_wq_enable_map))
+ continue;
+
+ wq = idxd->wqs[i];
+ mutex_lock(&wq->wq_lock);
+ memcpy(saved_wq, wq, sizeof(*saved_wq));
+ saved_wqs[i] = no_free_ptr(saved_wq);
+ mutex_unlock(&wq->wq_lock);
+ }
+
+ /* Save configurations */
+ idxd_saved->saved_groups = no_free_ptr(saved_groups);
+ idxd_saved->saved_engines = no_free_ptr(saved_engines);
+ idxd_saved->saved_wq_enable_map = no_free_ptr(saved_wq_enable_map);
+ idxd_saved->saved_wqs = no_free_ptr(saved_wqs);
+
+ return 0;
+}
+
+/*
+ * Restore IDXD device configurations including engines, groups, wqs etc
+ * that were saved before.
+ */
+static void idxd_device_config_restore(struct idxd_device *idxd,
+ struct idxd_saved_states *idxd_saved)
+{
+ struct idxd_evl *saved_evl = &idxd_saved->saved_evl;
+ int i;
+
+ idxd->rdbuf_limit = idxd_saved->saved_idxd.rdbuf_limit;
+
+ if (saved_evl)
+ idxd->evl->size = saved_evl->size;
+
+ for (i = 0; i < idxd->max_groups; i++) {
+ struct idxd_group *saved_group, *group;
+
+ saved_group = idxd_saved->saved_groups[i];
+ group = idxd->groups[i];
+
+ group->rdbufs_allowed = saved_group->rdbufs_allowed;
+ group->rdbufs_reserved = saved_group->rdbufs_reserved;
+ group->tc_a = saved_group->tc_a;
+ group->tc_b = saved_group->tc_b;
+ group->use_rdbuf_limit = saved_group->use_rdbuf_limit;
+
+ kfree(saved_group);
+ }
+ kfree(idxd_saved->saved_groups);
+
+ for (i = 0; i < idxd->max_engines; i++) {
+ struct idxd_engine *saved_engine, *engine;
+
+ saved_engine = idxd_saved->saved_engines[i];
+ engine = idxd->engines[i];
+
+ engine->group = saved_engine->group;
+
+ kfree(saved_engine);
+ }
+ kfree(idxd_saved->saved_engines);
+
+ bitmap_copy(idxd->wq_enable_map, idxd_saved->saved_wq_enable_map,
+ idxd->max_wqs);
+ bitmap_free(idxd_saved->saved_wq_enable_map);
+
+ for (i = 0; i < idxd->max_wqs; i++) {
+ struct idxd_wq *saved_wq, *wq;
+ size_t len;
+
+ if (!test_bit(i, idxd->wq_enable_map))
+ continue;
+
+ saved_wq = idxd_saved->saved_wqs[i];
+ wq = idxd->wqs[i];
+
+ mutex_lock(&wq->wq_lock);
+
+ wq->group = saved_wq->group;
+ wq->flags = saved_wq->flags;
+ wq->threshold = saved_wq->threshold;
+ wq->size = saved_wq->size;
+ wq->priority = saved_wq->priority;
+ wq->type = saved_wq->type;
+ len = strlen(saved_wq->name) + 1;
+ strscpy(wq->name, saved_wq->name, len);
+ wq->max_xfer_bytes = saved_wq->max_xfer_bytes;
+ wq->max_batch_size = saved_wq->max_batch_size;
+ wq->enqcmds_retries = saved_wq->enqcmds_retries;
+ wq->descs = saved_wq->descs;
+ wq->idxd_chan = saved_wq->idxd_chan;
+ len = strlen(saved_wq->driver_name) + 1;
+ strscpy(wq->driver_name, saved_wq->driver_name, len);
+
+ mutex_unlock(&wq->wq_lock);
+
+ kfree(saved_wq);
+ }
+
+ kfree(idxd_saved->saved_wqs);
+}
+
/*
* Probe idxd PCI device.
* If idxd is not given, need to allocate idxd and set up its data.
--
2.37.1
