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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright 2018 NXP
*/
#ifndef _DPAAX_IOVA_TABLE_H_
#define _DPAAX_IOVA_TABLE_H_
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include <inttypes.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <fcntl.h>
#include <glob.h>
#include <errno.h>
#include <arpa/inet.h>
#include <rte_eal.h>
#include <rte_branch_prediction.h>
#include <rte_memory.h>
#include <rte_malloc.h>
struct dpaax_iovat_element {
phys_addr_t start; /**< Start address of block of physical pages */
size_t len; /**< Difference of end-start for quick access */
uint64_t *pages; /**< VA for each physical page in this block */
};
struct dpaax_iova_table {
unsigned int count; /**< No. of blocks of contiguous physical pages */
struct dpaax_iovat_element entries[0];
};
/* Pointer to the table, which is common for DPAA/DPAA2 and only a single
* instance is required across net/crypto/event drivers. This table is
* populated iff devices are found on the bus.
*/
extern struct dpaax_iova_table *dpaax_iova_table_p;
/* Device tree file for memory layout is named 'memory@<addr>' where the 'addr'
* is SoC dependent, or even Uboot fixup dependent.
*/
#define MEM_NODE_PATH_GLOB "/proc/device-tree/memory[@0-9]*/reg"
/* Device file should be multiple of 16 bytes, each containing 8 byte of addr
* and its length. Assuming max of 5 entries.
*/
#define MEM_NODE_FILE_LEN ((16 * 5) + 1)
/* Table is made up of DPAAX_MEM_SPLIT elements for each contiguous zone. This
* helps avoid separate handling for cases where more than one size of hugepage
* is supported.
*/
#define DPAAX_MEM_SPLIT (1<<21)
#define DPAAX_MEM_SPLIT_MASK ~(DPAAX_MEM_SPLIT - 1) /**< Floor aligned */
#define DPAAX_MEM_SPLIT_MASK_OFF (DPAAX_MEM_SPLIT - 1) /**< Offset */
/* APIs exposed */
int dpaax_iova_table_populate(void);
void dpaax_iova_table_depopulate(void);
int dpaax_iova_table_update(phys_addr_t paddr, void *vaddr, size_t length);
void dpaax_iova_table_dump(void);
static inline void *dpaax_iova_table_get_va(phys_addr_t paddr) __attribute__((hot));
static inline void *
dpaax_iova_table_get_va(phys_addr_t paddr) {
unsigned int i = 0, index;
void *vaddr = 0;
phys_addr_t paddr_align = paddr & DPAAX_MEM_SPLIT_MASK;
size_t offset = paddr & DPAAX_MEM_SPLIT_MASK_OFF;
struct dpaax_iovat_element *entry;
if (unlikely(dpaax_iova_table_p == NULL))
return NULL;
entry = dpaax_iova_table_p->entries;
do {
if (unlikely(i > dpaax_iova_table_p->count))
break;
if (paddr_align < entry[i].start) {
/* Incorrect paddr; Not in memory range */
return NULL;
}
if (paddr_align > (entry[i].start + entry[i].len)) {
i++;
continue;
}
/* paddr > entry->start && paddr <= entry->(start+len) */
index = (paddr_align - entry[i].start)/DPAAX_MEM_SPLIT;
vaddr = (void *)((uintptr_t)entry[i].pages[index] + offset);
break;
} while (1);
return vaddr;
}
#endif /* _DPAAX_IOVA_TABLE_H_ */
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