Add support for rsmi_dev_memory_reserved_pages_get()

Also, don't return an error for empty sysfs files. The reserved memory
page file will often have no lines. We don't want it to appear that
this function is not supported if the file is empty.

Change-Id: I1d28bb184ea587bb578fe71dd75adc2a812d09a8

include/rocm_smi/rocm_smi.h

@@ -463,6 +463,27 @@ typedef uint64_t rsmi_bit_field_t;
 typedef rsmi_bit_field_t rsmi_bit_field;
 /// \endcond
 
+/**
+ * @brief Reserved Memory Page States
+ */
+typedef enum {
+  RSMI_MEM_PAGE_STATUS_RESERVED = 0,  //!< Reserved. This gpu page is reserved
+                                      //!<  and not available for use
+  RSMI_MEM_PAGE_STATUS_PENDING,       //!< Pending. This gpu page is marked
+                                      //!<  as bad and will be marked reserved
+                                      //!<  at the next window.
+  RSMI_MEM_PAGE_STATUS_UNRESERVABLE   //!< Unable to reserve this page
+} rsmi_memory_page_status_t;
+
+/**
+ * @brief Reserved Memory Page Record
+ */
+typedef struct {
+  uint64_t page_address;                  //!< Start address of page
+  uint64_t page_size;                     //!< Page size
+  rsmi_memory_page_status_t status;       //!< Page "reserved" status
+} rsmi_retired_page_record_t;
+
 /**
  * @brief Number of possible power profiles that a system could support
  */
@@ -1228,6 +1249,38 @@ rsmi_dev_memory_usage_get(uint32_t dv_ind, rsmi_memory_type_t mem_type,
 rsmi_status_t
 rsmi_dev_memory_busy_percent_get(uint32_t dv_ind, uint32_t *busy_percent);
 
+/**
+ * @brief Get information about reserved ("retired") memory pages
+ *
+ * @details Given a device index @p dv_ind, this function returns retired page
+ * information @p records corresponding to the device with the provided device
+ * index @p dv_ind. The number of retired page records is returned through @p
+ * num_pages. @p records may be NULL on input. In this case, the number of
+ * records available for retrieval will be returned through @p num_pages.
+ *
+ * @param[in] dv_ind a device index
+ *
+ * @param[inout] num_pages a pointer to a uint32. As input, the value passed
+ * through this parameter is the number of ::rsmi_retired_page_record_t's that
+ * may be safely written to the memory pointed to by @p records. This is the
+ * limit on how many records will be written to @p records. On return, @p
+ * num_pages will contain the number of records written to @p records, or the
+ * number of records that could have been written if enough memory had been
+ * provided.
+ *
+ * @param[inout] records A pointer to a block of memory to which the
+ * ::rsmi_retired_page_record_t values will be written. This value may be NULL.
+ * In this case, this function can be used to query how many records are
+ * available to read.
+ *
+ * @retval ::RSMI_STATUS_SUCCESS is returned upon successful call.
+ *
+ * ::RSMI_STATUS_INSUFFICIENT_SIZE is returned if more records were available
+ * than allowed by the provided, allocated memory.
+ */
+rsmi_status_t
+rsmi_dev_memory_reserved_pages_get(uint32_t dv_ind, uint32_t *num_pages,
+                                         rsmi_retired_page_record_t *records);
 /** @} */  // end of MemQuer
 
 /** @defgroup PhysQuer Physical State Queries

include/rocm_smi/rocm_smi_device.h

@@ -119,6 +119,7 @@ enum DevInfoTypes {
   kDevFwVersionVce,
   kDevFwVersionVcn,
   kDevSerialNumber,
+  kDevMemPageBad,
 };
 
 class Device {