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Date: Thu, 14 Dec 2017 12:00:13 +0000
From: Loic PALLARDY <loic.pallardy@...com>
To: Bjorn Andersson <bjorn.andersson@...aro.org>,
Ohad Ben-Cohen <ohad@...ery.com>
CC: "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 6/8] remoteproc: Move resource table load logic to find
> -----Original Message-----
> From: linux-remoteproc-owner@...r.kernel.org [mailto:linux-remoteproc-
> owner@...r.kernel.org] On Behalf Of Bjorn Andersson
> Sent: Wednesday, December 13, 2017 11:41 PM
> To: Ohad Ben-Cohen <ohad@...ery.com>; Bjorn Andersson
> <bjorn.andersson@...aro.org>
> Cc: linux-remoteproc@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [PATCH 6/8] 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.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
> drivers/remoteproc/remoteproc_core.c | 32 ++++++--------------------
> drivers/remoteproc/remoteproc_elf_loader.c | 37 ++++++++++++++++++--
> ----------
> drivers/remoteproc/remoteproc_internal.h | 16 +++++--------
> include/linux/remoteproc.h | 1 +
> 4 files changed, 36 insertions(+), 50 deletions(-)
>
> diff --git a/drivers/remoteproc/remoteproc_core.c
> b/drivers/remoteproc/remoteproc_core.c
> index 63d88d1d206e..cbd12382b219 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -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;
> diff --git a/drivers/remoteproc/remoteproc_elf_loader.c
> b/drivers/remoteproc/remoteproc_elf_loader.c
> index 822fa1bf893f..b17d72ec8603 100644
> --- a/drivers/remoteproc/remoteproc_elf_loader.c
> +++ b/drivers/remoteproc/remoteproc_elf_loader.c
> @@ -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;
Reading patch 7, I don't catch how firmware without resource table are supported as if no table found, an error is returned here.
In rproc_fw_boot, you have:
ret = rproc_load_rsc_table(rproc, fw);
if (ret)
goto disable_iommu;
So boot process is interrupted...
Regards,
Loic
>
> table = (struct resource_table *)(elf_data + shdr->sh_offset);
> - *tablesz = shdr->sh_size;
> + tablesz = shdr->sh_size;
> +
> + /*
> + * 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;
>
> - return table;
> + 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
> diff --git a/drivers/remoteproc/remoteproc_internal.h
> b/drivers/remoteproc/remoteproc_internal.h
> index a42690c514e2..55a2950c5cb7 100644
> --- a/drivers/remoteproc/remoteproc_internal.h
> +++ b/drivers/remoteproc/remoteproc_internal.h
> @@ -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
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index e21de55e19d1..ec1ada7cc6d7 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -344,6 +344,7 @@ 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);
> --
> 2.15.0
>
> --
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