[PATCH v6 05/16] remoteproc: Add new get_loaded_rsc_table() to rproc_ops

[Mathieu Poirier]

Add a new get_loaded_rsc_table() operation in order to support
scenarios where the remoteproc core has booted a remote processor
and detaches from it.  When re-attaching to the remote processor,
the core needs to know where the resource table has been placed
in memory.

Signed-off-by: Mathieu Poirier <mathieu.poir...@linaro.org>
---
New for V6:
- Don't return an error if a resource table doesn't exist.
---

 drivers/remoteproc/remoteproc_core.c     | 32 ++++++++++++++++++++++++
 drivers/remoteproc/remoteproc_internal.h | 10 ++++++++
 include/linux/remoteproc.h               |  6 ++++-
 3 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/drivers/remoteproc/remoteproc_core.c 
b/drivers/remoteproc/remoteproc_core.c
index 8c7e9f1d50d7..0012b7bdce24 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1537,6 +1537,32 @@ static int rproc_fw_boot(struct rproc *rproc, const 
struct firmware *fw)
        return ret;
 }
 
+static int rproc_set_loaded_rsc_table(struct rproc *rproc)
+{
+       struct resource_table *table_ptr;
+       struct device *dev = &rproc->dev;
+       size_t table_sz;
+       int ret;
+
+       table_ptr = rproc_get_loaded_rsc_table(rproc, &table_sz);
+       if (!table_ptr) {
+               /* Not having a resource table is acceptable */
+               return 0;
+       }
+
+       if (IS_ERR(table_ptr)) {
+               ret = PTR_ERR(table_ptr);
+               dev_err(dev, "can't load resource table: %d\n", ret);
+               return ret;
+       }
+
+       rproc->cached_table = NULL;
+       rproc->table_ptr = table_ptr;
+       rproc->table_sz = table_sz;
+
+       return 0;
+}
+
 /*
  * Attach to remote processor - similar to rproc_fw_boot() but without
  * the steps that deal with the firmware image.
@@ -1556,6 +1582,12 @@ static int rproc_attach(struct rproc *rproc)
                return ret;
        }
 
+       ret = rproc_set_loaded_rsc_table(rproc);
+       if (ret) {
+               dev_err(dev, "can't load resource table: %d\n", ret);
+               goto disable_iommu;
+       }
+
        /* reset max_notifyid */
        rproc->max_notifyid = -1;
 
diff --git a/drivers/remoteproc/remoteproc_internal.h 
b/drivers/remoteproc/remoteproc_internal.h
index c34002888d2c..4f73aac7e60d 100644
--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -177,6 +177,16 @@ struct resource_table *rproc_find_loaded_rsc_table(struct 
rproc *rproc,
        return NULL;
 }
 
+static inline
+struct resource_table *rproc_get_loaded_rsc_table(struct rproc *rproc,
+                                                 size_t *size)
+{
+       if (rproc->ops->get_loaded_rsc_table)
+               return rproc->ops->get_loaded_rsc_table(rproc, size);
+
+       return NULL;
+}
+
 static inline
 bool rproc_u64_fit_in_size_t(u64 val)
 {
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 6b0a0ed30a03..51538a7d120d 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -368,7 +368,9 @@ enum rsc_handling_status {
  * RSC_HANDLED if resource was handled, RSC_IGNORED if not handled and a
  * negative value on error
  * @load_rsc_table:    load resource table from firmware image
- * @find_loaded_rsc_table: find the loaded resouce table
+ * @find_loaded_rsc_table: find the loaded resource table from firmware image
+ * @get_loaded_rsc_table: get resource table installed in memory
+ *                       by external entity
  * @load:              load firmware to memory, where the remote processor
  *                     expects to find it
  * @sanity_check:      sanity check the fw image
@@ -390,6 +392,8 @@ struct rproc_ops {
                          int offset, int avail);
        struct resource_table *(*find_loaded_rsc_table)(
                                struct rproc *rproc, const struct firmware *fw);
+       struct resource_table *(*get_loaded_rsc_table)(
+                               struct rproc *rproc, size_t *size);
        int (*load)(struct rproc *rproc, const struct firmware *fw);
        int (*sanity_check)(struct rproc *rproc, const struct firmware *fw);
        u64 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw);
-- 
2.25.1