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remoteproc: Move resource table load logic to find 

Extend the previous operation of finding the resource table in the ELF
with the extra step of populating the rproc struct with a copy and the
size. This allows drivers to override the mechanism used for acquiring
the resource table, or omit it for firmware that is known not to have a
resource table.

This leaves the custom, dummy, find_rsc_table implementations found in
some drivers dangling.

Reviewed-By: Loic Pallardy <loic.pallardy@st.com>
Tested-By: Loic Pallardy <loic.pallardy@st.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Bjorn Andersson 2018-01-05 15:58:03 -08:00
parent d4bb86f2c3
commit 58b6409067
4 changed files with 37 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/remoteproc/remoteproc_core.c
View File

@ -907,8 +907,7 @@ 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;
int ret, tablesz;
int ret;
ret = rproc_fw_sanity_check(rproc, fw);
if (ret)
@ -927,27 +926,11 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
}
rproc->bootaddr = rproc_get_boot_addr(rproc, fw);
ret = -EINVAL;
/* look for the resource table */
table = rproc_find_rsc_table(rproc, fw, &tablesz);
if (!table) {
dev_err(dev, "Failed to find resource table\n");
goto clean_up;
}
/*
* 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 device memory.
*/
rproc->cached_table = kmemdup(table, tablesz, GFP_KERNEL);
if (!rproc->cached_table)
goto clean_up;
rproc->table_ptr = rproc->cached_table;
rproc->table_sz = tablesz;
/* load resource table */
ret = rproc_load_rsc_table(rproc, fw);
if (ret)
goto disable_iommu;
/* reset max_notifyid */
rproc->max_notifyid = -1;
@ -967,11 +950,10 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
clean_up_resources:
rproc_resource_cleanup(rproc);
clean_up:
kfree(rproc->cached_table);
rproc->cached_table = NULL;
rproc->table_ptr = NULL;
disable_iommu:
rproc_disable_iommu(rproc);
return ret;
}
@ -1443,7 +1425,7 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
/* Default to ELF loader if no load function is specified */
if (!rproc->ops->load) {
rproc->ops->load = rproc_elf_load_segments;
rproc->ops->find_rsc_table = rproc_elf_find_rsc_table;
rproc->ops->load_rsc_table = rproc_elf_load_rsc_table;
rproc->ops->find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table;
rproc->ops->sanity_check = rproc_elf_sanity_check;
rproc->ops->get_boot_addr = rproc_elf_get_boot_addr;

37
drivers/remoteproc/remoteproc_elf_loader.c
View File

@ -268,42 +268,49 @@ find_table(struct device *dev, struct elf32_hdr *ehdr, size_t fw_size)
}
/**
* rproc_elf_find_rsc_table() - find the resource table
* rproc_elf_load_rsc_table() - load the resource table
* @rproc: the rproc handle
* @fw: the ELF firmware image
* @tablesz: place holder for providing back the table size
*
* This function finds the resource table inside the remote processor's
* firmware. It is used both upon the registration of @rproc (in order
* to look for and register the supported virito devices), and when the
* @rproc is booted.
* firmware, load it into the @cached_table and update @table_ptr.
*
* Returns the pointer to the resource table if it is found, and write its
* size into @tablesz. If a valid table isn't found, NULL is returned
* (and @tablesz isn't set).
* Return: 0 on success, negative errno on failure.
*/
struct resource_table *rproc_elf_find_rsc_table(struct rproc *rproc,
const struct firmware *fw,
int *tablesz)
int rproc_elf_load_rsc_table(struct rproc *rproc, const struct firmware *fw)
{
struct elf32_hdr *ehdr;
struct elf32_shdr *shdr;
struct device *dev = &rproc->dev;
struct resource_table *table = NULL;
const u8 *elf_data = fw->data;
size_t tablesz;
ehdr = (struct elf32_hdr *)elf_data;
shdr = find_table(dev, ehdr, fw->size);
if (!shdr)
return NULL;
return -EINVAL;
table = (struct resource_table *)(elf_data + shdr->sh_offset);
*tablesz = shdr->sh_size;
tablesz = shdr->sh_size;
return table;
/*
* 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 device memory.
*/
rproc->cached_table = kmemdup(table, tablesz, GFP_KERNEL);
if (!rproc->cached_table)
return -ENOMEM;
rproc->table_ptr = rproc->cached_table;
rproc->table_sz = tablesz;
return 0;
}
EXPORT_SYMBOL(rproc_elf_find_rsc_table);
EXPORT_SYMBOL(rproc_elf_load_rsc_table);
/**
* rproc_elf_find_loaded_rsc_table() - find the loaded resource table

16
drivers/remoteproc/remoteproc_internal.h
View File

@ -57,9 +57,7 @@ int rproc_trigger_recovery(struct rproc *rproc);
int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw);
u32 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw);
int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw);
struct resource_table *rproc_elf_find_rsc_table(struct rproc *rproc,
const struct firmware *fw,
int *tablesz);
int rproc_elf_load_rsc_table(struct rproc *rproc, const struct firmware *fw);
struct resource_table *rproc_elf_find_loaded_rsc_table(struct rproc *rproc,
const struct firmware *fw);
@ -90,15 +88,13 @@ int rproc_load_segments(struct rproc *rproc, const struct firmware *fw)
return -EINVAL;
}
static inline
struct resource_table *rproc_find_rsc_table(struct rproc *rproc,
const struct firmware *fw,
int *tablesz)
static inline int rproc_load_rsc_table(struct rproc *rproc,
const struct firmware *fw)
{
if (rproc->ops->find_rsc_table)
return rproc->ops->find_rsc_table(rproc, fw, tablesz);
if (rproc->ops->load_rsc_table)
return rproc->ops->load_rsc_table(rproc, fw);
return NULL;
return 0;
}
static inline

2
include/linux/remoteproc.h
View File

@ -332,6 +332,7 @@ struct firmware;
* @stop: power off the device
* @kick: kick a virtqueue (virtqueue id given as a parameter)
* @da_to_va: optional platform hook to perform address translations
* @load_rsc_table: load resource table from firmware image
* @find_rsc_table: find the resource table inside the firmware image
* @find_loaded_rsc_table: find the loaded resouce table
* @load: load firmeware to memory, where the remote processor
@ -344,6 +345,7 @@ struct rproc_ops {
int (*stop)(struct rproc *rproc);
void (*kick)(struct rproc *rproc, int vqid);
void * (*da_to_va)(struct rproc *rproc, u64 da, int len);
int (*load_rsc_table)(struct rproc *rproc, const struct firmware *fw);
struct resource_table *(*find_rsc_table)(struct rproc *rproc,
const struct firmware *fw,
int *tablesz);