On Fri, Feb 26, 2021 at 05:14:36PM +0100, Arnaud POULIQUEN wrote:
> Hi Mathieu,
>
Good morning,
> On 2/24/21 12:35 AM, Mathieu Poirier wrote:
> > Add a new get_loaded_rsc_table() operation in order to support
> > scenarios where the remoteproc core has booted a remote processor
> > and detaches from it. When re-attaching to the remote processor,
> > the core needs to know where the resource table has been placed
> > in memory.
> >
> > Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
> > ---
> > New for V6:
> > - Don't return an error if a resource table doesn't exist.
> > ---
> >
> > drivers/remoteproc/remoteproc_core.c | 32 ++++++++++++++++++++++++
> > drivers/remoteproc/remoteproc_internal.h | 10 ++++++++
> > include/linux/remoteproc.h | 6 ++++-
> > 3 files changed, 47 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> > index 8c7e9f1d50d7..0012b7bdce24 100644
> > --- a/drivers/remoteproc/remoteproc_core.c
> > +++ b/drivers/remoteproc/remoteproc_core.c
> > @@ -1537,6 +1537,32 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
> > return ret;
> > }
> >
> > +static int rproc_set_loaded_rsc_table(struct rproc *rproc)
> > +{
> > + struct resource_table *table_ptr;
> > + struct device *dev = &rproc->dev;
> > + size_t table_sz;
> > + int ret;
> > +
> > + table_ptr = rproc_get_loaded_rsc_table(rproc, &table_sz);
> > + if (!table_ptr) {
> > + /* Not having a resource table is acceptable */
> > + return 0;
>
> Would it be an over protection to set rproc->table_ptr to NULL here?
>
I thought about that too but since memory for @rproc is allocated with kzalloc()
it wouldn't provide anything more.
> else
>
> Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@xxxxxx>
>
> Thanks,
> Arnaud
>
> > + }
> > +
> > + if (IS_ERR(table_ptr)) {
> > + ret = PTR_ERR(table_ptr);
> > + dev_err(dev, "can't load resource table: %d\n", ret);
> > + return ret;
> > + }
> > +
> > + rproc->cached_table = NULL;
> > + rproc->table_ptr = table_ptr;
> > + rproc->table_sz = table_sz;
> > +
> > + return 0;
> > +}
> > +
> > /*
> > * Attach to remote processor - similar to rproc_fw_boot() but without
> > * the steps that deal with the firmware image.
> > @@ -1556,6 +1582,12 @@ static int rproc_attach(struct rproc *rproc)
> > return ret;
> > }
> >
> > + ret = rproc_set_loaded_rsc_table(rproc);
> > + if (ret) {
> > + dev_err(dev, "can't load resource table: %d\n", ret);
> > + goto disable_iommu;
> > + }
> > +
> > /* reset max_notifyid */
> > rproc->max_notifyid = -1;
> >
> > diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
> > index c34002888d2c..4f73aac7e60d 100644
> > --- a/drivers/remoteproc/remoteproc_internal.h
> > +++ b/drivers/remoteproc/remoteproc_internal.h
> > @@ -177,6 +177,16 @@ struct resource_table *rproc_find_loaded_rsc_table(struct rproc *rproc,
> > return NULL;
> > }
> >
> > +static inline
> > +struct resource_table *rproc_get_loaded_rsc_table(struct rproc *rproc,
> > + size_t *size)
> > +{
> > + if (rproc->ops->get_loaded_rsc_table)
> > + return rproc->ops->get_loaded_rsc_table(rproc, size);
> > +
> > + return NULL;
> > +}
> > +
> > static inline
> > bool rproc_u64_fit_in_size_t(u64 val)
> > {
> > diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> > index 6b0a0ed30a03..51538a7d120d 100644
> > --- a/include/linux/remoteproc.h
> > +++ b/include/linux/remoteproc.h
> > @@ -368,7 +368,9 @@ enum rsc_handling_status {
> > * RSC_HANDLED if resource was handled, RSC_IGNORED if not handled and a
> > * negative value on error
> > * @load_rsc_table: load resource table from firmware image
> > - * @find_loaded_rsc_table: find the loaded resouce table
> > + * @find_loaded_rsc_table: find the loaded resource table from firmware image
> > + * @get_loaded_rsc_table: get resource table installed in memory
> > + * by external entity
> > * @load: load firmware to memory, where the remote processor
> > * expects to find it
> > * @sanity_check: sanity check the fw image
> > @@ -390,6 +392,8 @@ struct rproc_ops {
> > int offset, int avail);
> > struct resource_table *(*find_loaded_rsc_table)(
> > struct rproc *rproc, const struct firmware *fw);
> > + struct resource_table *(*get_loaded_rsc_table)(
> > + struct rproc *rproc, size_t *size);
> > int (*load)(struct rproc *rproc, const struct firmware *fw);
> > int (*sanity_check)(struct rproc *rproc, const struct firmware *fw);
> > u64 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw);
> >
