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Date: Thu, 27 Sep 2018 15:03:38 -0500
From: Li Yang <leoyang.li@....com>
To: Laurentiu Tudor <laurentiu.tudor@....com>
Cc: "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>, Netdev <netdev@...r.kernel.org>,
lkml <linux-kernel@...r.kernel.org>,
"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
<linux-arm-kernel@...ts.infradead.org>,
Roy Pledge <roy.pledge@....com>, madalin.bucur@....com,
David Miller <davem@...emloft.net>,
Shawn Guo <shawnguo@...nel.org>, robin.murphy@....com,
bharat.bhushan@....com
Subject: Re: [PATCH v2 08/22] soc/fsl/qbman_portals: add APIs to retrieve the
probing status
On Wed, Sep 26, 2018 at 8:26 AM <laurentiu.tudor@....com> wrote:
>
> From: Laurentiu Tudor <laurentiu.tudor@....com>
>
> Add a couple of new APIs to check the probing status of the required
> cpu bound qman and bman portals:
> 'int bman_portals_probed()' and 'int qman_portals_probed()'.
> They return the following values.
> * 1 if qman/bman portals were all probed correctly
> * 0 if qman/bman portals were not yet probed
> * -1 if probing of qman/bman portals failed
> Drivers that use qman/bman portal driver services are required to use
> these APIs before calling any functions exported by these drivers or
> otherwise they will crash the kernel.
> First user will be the dpaa1 ethernet driver, coming in a subsequent
> patch.
>
> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
> ---
> drivers/soc/fsl/qbman/bman_portal.c | 10 ++++++++++
> drivers/soc/fsl/qbman/qman_portal.c | 10 ++++++++++
> include/soc/fsl/bman.h | 8 ++++++++
> include/soc/fsl/qman.h | 9 +++++++++
> 4 files changed, 37 insertions(+)
>
> diff --git a/drivers/soc/fsl/qbman/bman_portal.c b/drivers/soc/fsl/qbman/bman_portal.c
> index f9edd28894fd..8048d35de8a2 100644
> --- a/drivers/soc/fsl/qbman/bman_portal.c
> +++ b/drivers/soc/fsl/qbman/bman_portal.c
> @@ -32,6 +32,7 @@
>
> static struct bman_portal *affine_bportals[NR_CPUS];
> static struct cpumask portal_cpus;
> +static int __bman_portals_probed;
> /* protect bman global registers and global data shared among portals */
> static DEFINE_SPINLOCK(bman_lock);
>
> @@ -85,6 +86,12 @@ static int bman_online_cpu(unsigned int cpu)
> return 0;
> }
>
> +int bman_portals_probed(void)
> +{
> + return __bman_portals_probed;
> +}
> +EXPORT_SYMBOL_GPL(bman_portals_probed);
> +
> static int bman_portal_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -148,6 +155,7 @@ static int bman_portal_probe(struct platform_device *pdev)
> spin_lock(&bman_lock);
> cpu = cpumask_next_zero(-1, &portal_cpus);
> if (cpu >= nr_cpu_ids) {
> + __bman_portals_probed = 1;
What if the last CPU is not used for portals? Is there a hard
requirement that all CPUs need to be used for portal? What happens if
the last CPU is offline?
> /* unassigned portal, skip init */
> spin_unlock(&bman_lock);
> return 0;
> @@ -173,6 +181,8 @@ static int bman_portal_probe(struct platform_device *pdev)
> err_ioremap2:
> memunmap(pcfg->addr_virt_ce);
> err_ioremap1:
> + __bman_portals_probed = 1;
> +
There are other error paths that not covered.
> return -ENXIO;
> }
>
> diff --git a/drivers/soc/fsl/qbman/qman_portal.c b/drivers/soc/fsl/qbman/qman_portal.c
> index eef93cab84f1..1b2fc981c269 100644
> --- a/drivers/soc/fsl/qbman/qman_portal.c
> +++ b/drivers/soc/fsl/qbman/qman_portal.c
> @@ -39,6 +39,7 @@ EXPORT_SYMBOL(qman_dma_portal);
> #define CONFIG_FSL_DPA_PIRQ_FAST 1
>
> static struct cpumask portal_cpus;
> +static int __qman_portals_probed;
> /* protect qman global registers and global data shared among portals */
> static DEFINE_SPINLOCK(qman_lock);
>
> @@ -219,6 +220,12 @@ static int qman_online_cpu(unsigned int cpu)
> return 0;
> }
>
> +int qman_portals_probed(void)
> +{
> + return __qman_portals_probed;
> +}
> +EXPORT_SYMBOL_GPL(qman_portals_probed);
> +
> static int qman_portal_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -306,6 +313,7 @@ static int qman_portal_probe(struct platform_device *pdev)
> spin_lock(&qman_lock);
> cpu = cpumask_next_zero(-1, &portal_cpus);
> if (cpu >= nr_cpu_ids) {
> + __qman_portals_probed = 1;
Ditto.
> /* unassigned portal, skip init */
> spin_unlock(&qman_lock);
> return 0;
> @@ -336,6 +344,8 @@ static int qman_portal_probe(struct platform_device *pdev)
> err_ioremap2:
> memunmap(pcfg->addr_virt_ce);
> err_ioremap1:
> + __qman_portals_probed = -1;
> +
Ditto.
> return -ENXIO;
> }
>
> diff --git a/include/soc/fsl/bman.h b/include/soc/fsl/bman.h
> index 5b99cb2ea5ef..173e4049d963 100644
> --- a/include/soc/fsl/bman.h
> +++ b/include/soc/fsl/bman.h
> @@ -133,5 +133,13 @@ int bman_acquire(struct bman_pool *pool, struct bm_buffer *bufs, u8 num);
> * failed to probe or 0 if the bman driver did not probed yet.
> */
> int bman_is_probed(void);
> +/**
> + * bman_portals_probed - Check if all cpu bound bman portals are probed
> + *
> + * Returns 1 if all the required cpu bound bman portals successfully probed,
> + * -1 if probe errors appeared or 0 if the bman portals did not yet finished
> + * probing.
> + */
> +int bman_portals_probed(void);
>
> #endif /* __FSL_BMAN_H */
> diff --git a/include/soc/fsl/qman.h b/include/soc/fsl/qman.h
> index 597783b8a3a0..7732e48081eb 100644
> --- a/include/soc/fsl/qman.h
> +++ b/include/soc/fsl/qman.h
> @@ -1194,4 +1194,13 @@ int qman_release_cgrid(u32 id);
> */
> int qman_is_probed(void);
>
> +/**
> + * qman_portals_probed - Check if all cpu bound qman portals are probed
> + *
> + * Returns 1 if all the required cpu bound qman portals successfully probed,
> + * -1 if probe errors appeared or 0 if the qman portals did not yet finished
> + * probing.
> + */
> +int qman_portals_probed(void);
> +
> #endif /* __FSL_QMAN_H */
> --
> 2.17.1
>
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