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/* Copyright 2013-2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <skiboot.h>
#include <fsp.h>
#include <opal.h>
#include <lock.h>
#include <device.h>
#include <fsp-elog.h>
//#define DBG(fmt...) printf("RTC: " fmt)
#define DBG(fmt...) do { } while(0)
/*
* The FSP NVRAM API operates in "blocks" of 4K. It is entirely exposed
* to the OS via the OPAL APIs.
*
* In order to avoid dealing with complicated read/modify/write state
* machines (and added issues related to FSP failover in the middle)
* we keep a memory copy of the entire nvram which we load at boot
* time. We save only modified blocks.
*
* To limit the amount of memory used by the nvram image, we limit
* how much nvram we support to NVRAM_SIZE. Additionally, this limit
* of 1M is the maximum that the CHRP/PAPR nvram partition format
* supports for a partition entry.
*
* (Q: should we save the whole thing in case of FSP failover ?)
*
* The nvram is expected to comply with the CHRP/PAPR defined format,
* and specifically contain a System partition (ID 0x70) named "common"
* with configuration variables for the bootloader and a FW private
* partition for future use by skiboot.
*
* If the partition layout appears broken or lacks one of the above
* partitions, we reformat the entire nvram at boot time.
*
* We do not exploit the ability of the FSP to store a checksum. This
* is documented as possibly going away. The CHRP format for nvram
* that Linux uses has its own (though weak) checksum mechanism already
*
*/
#define NVRAM_BLKSIZE 0x1000
struct nvram_triplet {
uint64_t dma_addr;
uint32_t blk_offset;
uint32_t blk_count;
} __packed;
#define NVRAM_FLAG_CLEAR_WPEND 0x80000000
enum nvram_state {
NVRAM_STATE_CLOSED,
NVRAM_STATE_OPENING,
NVRAM_STATE_BROKEN,
NVRAM_STATE_OPEN,
NVRAM_STATE_ABSENT,
};
static void *fsp_nvram_image;
static uint32_t fsp_nvram_size;
static struct lock fsp_nvram_lock = LOCK_UNLOCKED;
static struct fsp_msg *fsp_nvram_msg;
static uint32_t fsp_nvram_dirty_start;
static uint32_t fsp_nvram_dirty_end;
static bool fsp_nvram_was_read;
static struct nvram_triplet fsp_nvram_triplet __align(0x1000);
static enum nvram_state fsp_nvram_state = NVRAM_STATE_CLOSED;
DEFINE_LOG_ENTRY(OPAL_RC_NVRAM_INIT, OPAL_PLATFORM_ERR_EVT , OPAL_NVRAM,
OPAL_MISC_SUBSYSTEM, OPAL_PREDICTIVE_ERR_GENERAL,
OPAL_NA, NULL);
DEFINE_LOG_ENTRY(OPAL_RC_NVRAM_OPEN, OPAL_PLATFORM_ERR_EVT, OPAL_NVRAM,
OPAL_MISC_SUBSYSTEM, OPAL_PREDICTIVE_ERR_GENERAL,
OPAL_NA, NULL);
DEFINE_LOG_ENTRY(OPAL_RC_NVRAM_SIZE, OPAL_PLATFORM_ERR_EVT, OPAL_NVRAM,
OPAL_MISC_SUBSYSTEM, OPAL_PREDICTIVE_ERR_GENERAL,
OPAL_NA, NULL);
DEFINE_LOG_ENTRY(OPAL_RC_NVRAM_READ, OPAL_PLATFORM_ERR_EVT, OPAL_NVRAM,
OPAL_MISC_SUBSYSTEM, OPAL_PREDICTIVE_ERR_GENERAL,
OPAL_NA, NULL);
DEFINE_LOG_ENTRY(OPAL_RC_NVRAM_WRITE, OPAL_PLATFORM_ERR_EVT, OPAL_NVRAM,
OPAL_MISC_SUBSYSTEM, OPAL_PREDICTIVE_ERR_GENERAL,
OPAL_NA, NULL);
static void fsp_nvram_send_write(void);
static void fsp_nvram_wr_complete(struct fsp_msg *msg)
{
struct fsp_msg *resp = msg->resp;
uint8_t rc;
lock(&fsp_nvram_lock);
fsp_nvram_msg = NULL;
/* Check for various errors. If an error occurred,
* we generally assume the nvram is completely dirty
* but we won't trigger a new write until we get
* either a new attempt at writing, or an FSP reset
* reload (TODO)
*/
if (!resp || resp->state != fsp_msg_response)
goto fail_dirty;
rc = (msg->word1 >> 8) & 0xff;
switch(rc) {
case 0:
case 0x44:
/* Sync to secondary required... XXX */
case 0x45:
break;
case 0xef:
/* Sync to secondary failed, let's ignore that for now,
* maybe when (if) we handle redundant FSPs ...
*/
prerror("FSP: NVRAM sync to secondary failed\n");
break;
default:
log_simple_error(&e_info(OPAL_RC_NVRAM_WRITE),
"FSP: NVRAM write return error 0x%02x\n", rc);
goto fail_dirty;
}
fsp_freemsg(msg);
if (fsp_nvram_dirty_start <= fsp_nvram_dirty_end)
fsp_nvram_send_write();
unlock(&fsp_nvram_lock);
return;
fail_dirty:
fsp_nvram_dirty_start = 0;
fsp_nvram_dirty_end = fsp_nvram_size - 1;
fsp_freemsg(msg);
unlock(&fsp_nvram_lock);
}
static void fsp_nvram_send_write(void)
{
uint32_t start = fsp_nvram_dirty_start;
uint32_t end = fsp_nvram_dirty_end;
uint32_t count;
if (start > end || fsp_nvram_state != NVRAM_STATE_OPEN)
return;
count = (end - start) / NVRAM_BLKSIZE + 1;
fsp_nvram_triplet.dma_addr = PSI_DMA_NVRAM_BODY + start;
fsp_nvram_triplet.blk_offset = start / NVRAM_BLKSIZE;
fsp_nvram_triplet.blk_count = count;
fsp_nvram_msg = fsp_mkmsg(FSP_CMD_WRITE_VNVRAM, 6,
0, PSI_DMA_NVRAM_TRIPL, 1,
NVRAM_FLAG_CLEAR_WPEND, 0, 0);
if (fsp_queue_msg(fsp_nvram_msg, fsp_nvram_wr_complete)) {
fsp_freemsg(fsp_nvram_msg);
fsp_nvram_msg = NULL;
log_simple_error(&e_info(OPAL_RC_NVRAM_WRITE),
"FSP: Error queueing nvram update\n");
return;
}
fsp_nvram_dirty_start = fsp_nvram_size;
fsp_nvram_dirty_end = 0;
}
static void fsp_nvram_rd_complete(struct fsp_msg *msg)
{
int64_t rc;
lock(&fsp_nvram_lock);
/* Read complete, check status. What to do if the read fails ?
*
* Well, there could be various reasons such as an FSP reboot
* at the wrong time, but there is really not much we can do
* so for now I'll just mark the nvram as closed, and we'll
* attempt a re-open and re-read whenever the OS tries to
* access it
*/
rc = (msg->resp->word1 >> 8) & 0xff;
fsp_nvram_msg = NULL;
fsp_freemsg(msg);
if (rc) {
prerror("FSP: NVRAM read failed, will try again later\n");
fsp_nvram_state = NVRAM_STATE_CLOSED;
} else {
/* nvram was read once, no need to do it ever again */
fsp_nvram_was_read = true;
fsp_nvram_state = NVRAM_STATE_OPEN;
/* XXX Here we should look for nvram settings that concern
* us such as guest kernel arguments etc...
*/
}
unlock(&fsp_nvram_lock);
}
static void fsp_nvram_send_read(void)
{
fsp_nvram_msg = fsp_mkmsg(FSP_CMD_READ_VNVRAM, 4,
0, PSI_DMA_NVRAM_BODY, 0,
fsp_nvram_size / NVRAM_BLKSIZE);
if (fsp_queue_msg(fsp_nvram_msg, fsp_nvram_rd_complete)) {
/* If the nvram read fails to queue, we mark ourselves
* closed. Shouldn't have happened anyway. Not much else
* we can do.
*/
fsp_nvram_state = NVRAM_STATE_CLOSED;
fsp_freemsg(fsp_nvram_msg);
fsp_nvram_msg = NULL;
log_simple_error(&e_info(OPAL_RC_NVRAM_READ),
"FSP: Error queueing nvram read\n");
return;
}
}
static void fsp_nvram_open_complete(struct fsp_msg *msg)
{
int8_t rc;
lock(&fsp_nvram_lock);
/* Open complete, check status */
rc = (msg->resp->word1 >> 8) & 0xff;
fsp_nvram_msg = NULL;
fsp_freemsg(msg);
if (rc) {
log_simple_error(&e_info(OPAL_RC_NVRAM_OPEN),
"FSP: NVRAM open failed, FSP error 0x%02x\n", rc);
goto failed;
}
if (fsp_nvram_was_read)
fsp_nvram_state = NVRAM_STATE_OPEN;
else
fsp_nvram_send_read();
unlock(&fsp_nvram_lock);
return;
failed:
fsp_nvram_state = NVRAM_STATE_CLOSED;
unlock(&fsp_nvram_lock);
}
static void fsp_nvram_send_open(void)
{
printf("FSP NVRAM: Opening nvram...\n");
fsp_nvram_msg = fsp_mkmsg(FSP_CMD_OPEN_VNVRAM, 1, fsp_nvram_size);
assert(fsp_nvram_msg);
fsp_nvram_state = NVRAM_STATE_OPENING;
if (!fsp_queue_msg(fsp_nvram_msg, fsp_nvram_open_complete))
return;
prerror("FSP NVRAM: Failed to queue nvram open message\n");
fsp_freemsg(fsp_nvram_msg);
fsp_nvram_msg = NULL;
fsp_nvram_state = NVRAM_STATE_CLOSED;
}
static bool fsp_nvram_get_size(uint32_t *out_size)
{
struct fsp_msg *msg;
int rc, size;
msg = fsp_mkmsg(FSP_CMD_GET_VNVRAM_SIZE, 0);
rc = fsp_sync_msg(msg, false);
size = msg->resp ? msg->resp->data.words[0] : 0;
fsp_freemsg(msg);
if (rc || size == 0) {
log_simple_error(&e_info(OPAL_RC_NVRAM_SIZE),
"FSP: Error %d nvram size reported is %d\n", rc, size);
fsp_nvram_state = NVRAM_STATE_BROKEN;
return false;
}
printf("FSP: NVRAM file size from FSP is %d bytes\n", size);
*out_size = size;
return true;
}
static bool fsp_nvram_msg_rr(u32 cmd_sub_mod, struct fsp_msg *msg)
{
assert(msg == NULL);
switch (cmd_sub_mod) {
case FSP_RESET_START:
printf("FSP: Closing NVRAM on account of FSP Reset\n");
fsp_nvram_state = NVRAM_STATE_CLOSED;
return true;
case FSP_RELOAD_COMPLETE:
printf("FSP: Reopening NVRAM of FSP Reload complete\n");
lock(&fsp_nvram_lock);
fsp_nvram_send_open();
unlock(&fsp_nvram_lock);
return true;
}
return false;
}
static struct fsp_client fsp_nvram_client_rr = {
.message = fsp_nvram_msg_rr,
};
int fsp_nvram_info(uint32_t *total_size)
{
if (!fsp_present()) {
fsp_nvram_state = NVRAM_STATE_ABSENT;
return OPAL_HARDWARE;
}
if (!fsp_nvram_get_size(total_size))
return OPAL_HARDWARE;
return OPAL_SUCCESS;
}
int fsp_nvram_start_read(void *dst, uint32_t src, uint32_t len)
{
/* We are currently limited to fully aligned transfers */
assert((((uint64_t)dst) & 0xfff) == 0);
assert(dst);
/* Currently don't support src!=0 */
assert(src == 0);
if (!fsp_present())
return -ENODEV;
op_display(OP_LOG, OP_MOD_INIT, 0x0007);
lock(&fsp_nvram_lock);
/* Store image info */
fsp_nvram_image = dst;
fsp_nvram_size = len;
/* Mark nvram as not dirty */
fsp_nvram_dirty_start = len;
fsp_nvram_dirty_end = 0;
/* Map TCEs */
fsp_tce_map(PSI_DMA_NVRAM_TRIPL, &fsp_nvram_triplet,
PSI_DMA_NVRAM_TRIPL_SZ);
fsp_tce_map(PSI_DMA_NVRAM_BODY, dst, PSI_DMA_NVRAM_BODY_SZ);
/* Register for the reset/reload event */
fsp_register_client(&fsp_nvram_client_rr, FSP_MCLASS_RR_EVENT);
/* Open and load the nvram from the FSP */
fsp_nvram_send_open();
unlock(&fsp_nvram_lock);
return 0;
}
int fsp_nvram_write(uint32_t offset, void *src, uint32_t size)
{
uint64_t end = offset + size - 1;
/* We only support writing from the original image */
if (src != fsp_nvram_image + offset)
return OPAL_HARDWARE;
offset &= ~(NVRAM_BLKSIZE - 1);
end &= ~(NVRAM_BLKSIZE - 1);
lock(&fsp_nvram_lock);
/* If the nvram is closed, try re-opening */
if (fsp_nvram_state == NVRAM_STATE_CLOSED)
fsp_nvram_send_open();
if (fsp_nvram_dirty_start > offset)
fsp_nvram_dirty_start = offset;
if (fsp_nvram_dirty_end < end)
fsp_nvram_dirty_end = end;
if (!fsp_nvram_msg && fsp_nvram_state == NVRAM_STATE_OPEN)
fsp_nvram_send_write();
unlock(&fsp_nvram_lock);
return 0;
}
/* This is called right before starting the payload (Linux) to
* ensure the initial open & read of nvram has happened before
* we transfer control as the guest OS. This is necessary as
* Linux will not handle a OPAL_BUSY return properly and treat
* it as an error
*/
void fsp_nvram_wait_open(void)
{
if (!fsp_present())
return;
while(fsp_nvram_state == NVRAM_STATE_OPENING)
fsp_poll();
if (!fsp_nvram_was_read) {
log_simple_error(&e_info(OPAL_RC_NVRAM_INIT),
"FSP: NVRAM not read, skipping init\n");
nvram_read_complete(false);
return;
}
nvram_read_complete(true);
}
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