linux-kernel - Re: [PATCH v3 02/20] remoteproc: core: Add function to dump resource table

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Date:   Fri, 14 Oct 2016 09:37:02 +0100
From:   Matt Redfearn <matt.redfearn@...tec.com>
To:     Loic Pallardy <loic.pallardy@...com>, <bjorn.andersson@...aro.org>,
        <ohad@...ery.com>, <lee.jones@...aro.org>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...inux.com>
Subject: Re: [PATCH v3 02/20] remoteproc: core: Add function to dump resource
 table

Hi Loic,


On 12/10/16 17:00, Loic Pallardy wrote:
> Firmware can be loaded with a resource table, which details
> resources needed by coprocessor like carevout memory, virtual
> device, trace log buffer etc.
>
> Until now, no method exists to display resource table content.
> This function adds the capability to display the different
> resources associated to a firmware if DEBUG is enabled.

How about instead adding this to a debugfs entry such that one can 
always access it rather than having to find it in the kernel log, only 
if DEBUG was enabled?

Thanks,
Matt

>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> Signed-off-by: Loic Pallardy <loic.pallardy@...com>
> ---
>   drivers/remoteproc/remoteproc_core.c | 85 ++++++++++++++++++++++++++++++++++++
>   1 file changed, 85 insertions(+)
>
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 67633ee..3c8395b 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -785,6 +785,91 @@ static void rproc_resource_cleanup(struct rproc *rproc)
>   		rproc_remove_virtio_dev(rvdev);
>   }
>   
> +static void rproc_dump_resource_table(struct rproc *rproc,
> +				      struct resource_table *table, int size)
> +{
> +	static const char *types[] = {"carveout", "devmem", "trace", "vdev"};
> +	struct device *dev = &rproc->dev;
> +	struct fw_rsc_carveout *c;
> +	struct fw_rsc_devmem *d;
> +	struct fw_rsc_trace *t;
> +	struct fw_rsc_vdev *v;
> +	int i, j;
> +
> +	if (!table) {
> +		dev_dbg(dev, "No resource table found\n");
> +		return;
> +	}
> +
> +	dev_dbg(dev, "Resource Table: Version %d with %d entries [size: %x]\n",
> +		table->ver, table->num, size);
> +
> +	for (i = 0; i < table->num; i++) {
> +		int offset = table->offset[i];
> +		struct fw_rsc_hdr *hdr = (void *)table + offset;
> +		void *rsc = (void *)hdr + sizeof(*hdr);
> +
> +		switch (hdr->type) {
> +		case RSC_CARVEOUT:
> +			c = rsc;
> +			dev_dbg(dev, "Entry %d is of type %s\n", i, types[hdr->type]);
> +			dev_dbg(dev, "  Device Address 0x%x\n", c->da);
> +			dev_dbg(dev, "  Physical Address 0x%x\n", c->pa);
> +			dev_dbg(dev, "  Length 0x%x Bytes\n", c->len);
> +			dev_dbg(dev, "  Flags 0x%x\n", c->flags);
> +			dev_dbg(dev, "  Reserved (should be zero) [%d]\n", c->reserved);
> +			dev_dbg(dev, "  Name %s\n\n", c->name);
> +			break;
> +		case RSC_DEVMEM:
> +			d = rsc;
> +			dev_dbg(dev, "Entry %d is of type %s\n", i, types[hdr->type]);
> +			dev_dbg(dev, "  Device Address 0x%x\n", d->da);
> +			dev_dbg(dev, "  Physical Address 0x%x\n", d->pa);
> +			dev_dbg(dev, "  Length 0x%x Bytes\n", d->len);
> +			dev_dbg(dev, "  Flags 0x%x\n", d->flags);
> +			dev_dbg(dev, "  Reserved (should be zero) [%d]\n", d->reserved);
> +			dev_dbg(dev, "  Name %s\n\n", d->name);
> +			break;
> +		case RSC_TRACE:
> +			t = rsc;
> +			dev_dbg(dev, "Entry %d is of type %s\n", i, types[hdr->type]);
> +			dev_dbg(dev, "  Device Address 0x%x\n", t->da);
> +			dev_dbg(dev, "  Length 0x%x Bytes\n", t->len);
> +			dev_dbg(dev, "  Reserved (should be zero) [%d]\n", t->reserved);
> +			dev_dbg(dev, "  Name %s\n\n", t->name);
> +			break;
> +		case RSC_VDEV:
> +			v = rsc;
> +			dev_dbg(dev, "Entry %d is of type %s\n", i, types[hdr->type]);
> +
> +			dev_dbg(dev, "  ID %d\n", v->id);
> +			dev_dbg(dev, "  Notify ID %d\n", v->notifyid);
> +			dev_dbg(dev, "  Device features 0x%x\n", v->dfeatures);
> +			dev_dbg(dev, "  Guest features 0x%x\n", v->gfeatures);
> +			dev_dbg(dev, "  Config length 0x%x\n", v->config_len);
> +			dev_dbg(dev, "  Status 0x%x\n", v->status);
> +			dev_dbg(dev, "  Number of vrings %d\n", v->num_of_vrings);
> +			dev_dbg(dev, "  Reserved (should be zero) [%d][%d]\n\n",
> +				v->reserved[0], v->reserved[1]);
> +
> +			for (j = 0; j < v->num_of_vrings; j++) {
> +				dev_dbg(dev, "  Vring %d\n", j);
> +				dev_dbg(dev, "    Device Address 0x%x\n", v->vring[j].da);
> +				dev_dbg(dev, "    Alignment %d\n", v->vring[j].align);
> +				dev_dbg(dev, "    Number of buffers %d\n", v->vring[j].num);
> +				dev_dbg(dev, "    Notify ID %d\n", v->vring[j].notifyid);
> +				dev_dbg(dev, "    Physical Address 0x%x\n\n",
> +					v->vring[j].pa);
> +			}
> +			break;
> +		default:
> +			dev_dbg(dev, "Invalid resource type found: %d [hdr: %p]\n",
> +				hdr->type, hdr);
> +			return;
> +		}
> +	}
> +}
> +
>   int rproc_request_resource(struct rproc *rproc, u32 type, void *resource)
>   {
>   	struct device *dev = &rproc->dev;