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remoteproc: perserve resource table data

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Copy resource table from first to second firmware loading.
After firmware is loaded to memory, update the vdevs resource
pointer to the resource table kept in device memory.

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Acked-by: Ido Yariv <ido@wizery.com>
[rebase, terminology and style changes]
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
This commit is contained in:
Ohad Ben-Cohen 2013-04-07 14:06:07 +03:00
parent ba7290e016
commit a2b950ac7b
3 changed files with 88 additions and 20 deletions
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1
drivers/remoteproc/Kconfig
View File

@ -4,6 +4,7 @@ menu "Remoteproc drivers"
config REMOTEPROC
tristate
depends on HAS_DMA
select CRC32
select FW_CONFIG
select VIRTIO

98
drivers/remoteproc/remoteproc_core.c
View File

@ -37,6 +37,7 @@
#include <linux/iommu.h>
#include <linux/idr.h>
#include <linux/elf.h>
#include <linux/crc32.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_ring.h>
#include <asm/byteorder.h>
@ -45,7 +46,8 @@
typedef int (*rproc_handle_resources_t)(struct rproc *rproc,
struct resource_table *table, int len);
typedef int (*rproc_handle_resource_t)(struct rproc *rproc, void *, int avail);
typedef int (*rproc_handle_resource_t)(struct rproc *rproc,
void *, int offset, int avail);
/* Unique indices for remoteproc devices */
static DEFINE_IDA(rproc_dev_index);
@ -302,7 +304,7 @@ void rproc_free_vring(struct rproc_vring *rvring)
* Returns 0 on success, or an appropriate error code otherwise
*/
static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
int avail)
int offset, int avail)
{
struct device *dev = &rproc->dev;
struct rproc_vdev *rvdev;
@ -346,6 +348,9 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
/* remember the device features */
rvdev->dfeatures = rsc->dfeatures;
/* remember the resource offset*/
rvdev->rsc_offset = offset;
list_add_tail(&rvdev->node, &rproc->rvdevs);
/* it is now safe to add the virtio device */
@ -377,7 +382,7 @@ free_rvdev:
* Returns 0 on success, or an appropriate error code otherwise
*/
static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc,
int avail)
int offset, int avail)
{
struct rproc_mem_entry *trace;
struct device *dev = &rproc->dev;
@ -459,7 +464,7 @@ static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc,
* are outside those ranges.
*/
static int rproc_handle_devmem(struct rproc *rproc, struct fw_rsc_devmem *rsc,
int avail)
int offset, int avail)
{
struct rproc_mem_entry *mapping;
struct device *dev = &rproc->dev;
@ -532,7 +537,9 @@ out:
* pressure is important; it may have a substantial impact on performance.
*/
static int rproc_handle_carveout(struct rproc *rproc,
struct fw_rsc_carveout *rsc, int avail)
struct fw_rsc_carveout *rsc,
int offset, int avail)
{
struct rproc_mem_entry *carveout, *mapping;
struct device *dev = &rproc->dev;
@ -655,7 +662,7 @@ free_carv:
}
static int rproc_count_vrings(struct rproc *rproc, struct fw_rsc_vdev *rsc,
int avail)
int offset, int avail)
{
/* Summarize the number of notification IDs */
rproc->max_notifyid += rsc->num_of_vrings;
@ -683,17 +690,16 @@ static rproc_handle_resource_t rproc_count_vrings_handler[RSC_LAST] = {
};
/* handle firmware resource entries before booting the remote processor */
static int rproc_handle_resources(struct rproc *rproc,
struct resource_table *table, int len,
static int rproc_handle_resources(struct rproc *rproc, int len,
rproc_handle_resource_t handlers[RSC_LAST])
{
struct device *dev = &rproc->dev;
rproc_handle_resource_t handler;
int ret = 0, i;
for (i = 0; i < table->num; i++) {
int offset = table->offset[i];
struct fw_rsc_hdr *hdr = (void *)table + offset;
for (i = 0; i < rproc->table_ptr->num; i++) {
int offset = rproc->table_ptr->offset[i];
struct fw_rsc_hdr *hdr = (void *)rproc->table_ptr + offset;
int avail = len - offset - sizeof(*hdr);
void *rsc = (void *)hdr + sizeof(*hdr);
@ -714,7 +720,7 @@ static int rproc_handle_resources(struct rproc *rproc,
if (!handler)
continue;
ret = handler(rproc, rsc, avail);
ret = handler(rproc, rsc, offset + sizeof(*hdr), avail);
if (ret)
break;
}
@ -772,9 +778,12 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
{
struct device *dev = &rproc->dev;
const char *name = rproc->firmware;
struct resource_table *table;
struct resource_table *table, *loaded_table;
int ret, tablesz;
if (!rproc->table_ptr)
return -ENOMEM;
ret = rproc_fw_sanity_check(rproc, fw);
if (ret)
return ret;
@ -800,9 +809,15 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
goto clean_up;
}
/* Verify that resource table in loaded fw is unchanged */
if (rproc->table_csum != crc32(0, table, tablesz)) {
dev_err(dev, "resource checksum failed, fw changed?\n");
ret = -EINVAL;
goto clean_up;
}
/* handle fw resources which are required to boot rproc */
ret = rproc_handle_resources(rproc, table, tablesz,
rproc_loading_handlers);
ret = rproc_handle_resources(rproc, tablesz, rproc_loading_handlers);
if (ret) {
dev_err(dev, "Failed to process resources: %d\n", ret);
goto clean_up;
@ -815,6 +830,19 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
goto clean_up;
}
/*
* The starting device has been given the rproc->cached_table as the
* resource table. The address of the vring along with the other
* allocated resources (carveouts etc) is stored in cached_table.
* In order to pass this information to the remote device we must
* copy this information to device memory.
*/
loaded_table = rproc_find_loaded_rsc_table(rproc, fw);
if (!loaded_table)
goto clean_up;
memcpy(loaded_table, rproc->cached_table, tablesz);
/* power up the remote processor */
ret = rproc->ops->start(rproc);
if (ret) {
@ -822,6 +850,13 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
goto clean_up;
}
/*
* Update table_ptr so that all subsequent vring allocations and
* virtio fields manipulation update the actual loaded resource table
* in device memory.
*/
rproc->table_ptr = loaded_table;
rproc->state = RPROC_RUNNING;
dev_info(dev, "remote processor %s is now up\n", rproc->name);
@ -856,16 +891,30 @@ static void rproc_fw_config_virtio(const struct firmware *fw, void *context)
if (!table)
goto out;
rproc->table_csum = crc32(0, table, tablesz);
/*
* Create a copy of the resource table. When a virtio device starts
* and calls vring_new_virtqueue() the address of the allocated vring
* will be stored in the cached_table. Before the device is started,
* cached_table will be copied into devic memory.
*/
rproc->cached_table = kmalloc(tablesz, GFP_KERNEL);
if (!rproc->cached_table)
goto out;
memcpy(rproc->cached_table, table, tablesz);
rproc->table_ptr = rproc->cached_table;
/* count the number of notify-ids */
rproc->max_notifyid = -1;
ret = rproc_handle_resources(rproc, table, tablesz,
rproc_count_vrings_handler);
/* look for virtio devices and register them */
ret = rproc_handle_resources(rproc, table, tablesz, rproc_vdev_handler);
ret = rproc_handle_resources(rproc, tablesz, rproc_count_vrings_handler);
if (ret)
goto out;
/* look for virtio devices and register them */
ret = rproc_handle_resources(rproc, tablesz, rproc_vdev_handler);
out:
release_firmware(fw);
/* allow rproc_del() contexts, if any, to proceed */
@ -923,6 +972,9 @@ int rproc_trigger_recovery(struct rproc *rproc)
/* wait until there is no more rproc users */
wait_for_completion(&rproc->crash_comp);
/* Free the copy of the resource table */
kfree(rproc->cached_table);
return rproc_add_virtio_devices(rproc);
}
@ -1078,6 +1130,9 @@ void rproc_shutdown(struct rproc *rproc)
rproc_disable_iommu(rproc);
/* Give the next start a clean resource table */
rproc->table_ptr = rproc->cached_table;
/* if in crash state, unlock crash handler */
if (rproc->state == RPROC_CRASHED)
complete_all(&rproc->crash_comp);
@ -1288,6 +1343,9 @@ int rproc_del(struct rproc *rproc)
list_for_each_entry_safe(rvdev, tmp, &rproc->rvdevs, node)
rproc_remove_virtio_dev(rvdev);
/* Free the copy of the resource table */
kfree(rproc->cached_table);
device_del(&rproc->dev);
return 0;

9
include/linux/remoteproc.h
View File

@ -401,6 +401,9 @@ enum rproc_crash_type {
* @crash_comp: completion used to sync crash handler and the rproc reload
* @recovery_disabled: flag that state if recovery was disabled
* @max_notifyid: largest allocated notify id.
* @table_ptr: pointer to the resource table in effect
* @cached_table: copy of the resource table
* @table_csum: checksum of the resource table
*/
struct rproc {
struct klist_node node;
@ -429,9 +432,13 @@ struct rproc {
struct completion crash_comp;
bool recovery_disabled;
int max_notifyid;
struct resource_table *table_ptr;
struct resource_table *cached_table;
u32 table_csum;
};
/* we currently support only two vrings per rvdev */
#define RVDEV_NUM_VRINGS 2
/**
@ -464,6 +471,7 @@ struct rproc_vring {
* @vring: the vrings for this vdev
* @dfeatures: virtio device features
* @gfeatures: virtio guest features
* @rsc_offset: offset of the vdev's resource entry
*/
struct rproc_vdev {
struct list_head node;
@ -472,6 +480,7 @@ struct rproc_vdev {
struct rproc_vring vring[RVDEV_NUM_VRINGS];
unsigned long dfeatures;
unsigned long gfeatures;
u32 rsc_offset;
};
struct rproc *rproc_alloc(struct device *dev, const char *name,