Re: [dpdk-dev] [PATCH v4] pci: save list of detached devices, and re-probe during driver unload

[Bruce Richardson <bruce.richardson@intel.com>]

On Thu, Mar 05, 2015 at 06:24:23PM +0200, Raz Amir wrote:
> Added code that saves the pointers to the detached devices, during
> driver loading, and during driver unloading, go over the list,
> and re-attach them by calling device_probe_and_attach
> on each device.
> 
> Signed-off-by: Raz Amir <razamir22@gmail.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

> ---
>  lib/librte_eal/bsdapp/nic_uio/nic_uio.c | 34 ++++++++++++++++++++++++++++-----
>  1 file changed, 29 insertions(+), 5 deletions(-)
> 
> diff --git a/lib/librte_eal/bsdapp/nic_uio/nic_uio.c b/lib/librte_eal/bsdapp/nic_uio/nic_uio.c
> index 5ae8560..7a4ed5d 100644
> --- a/lib/librte_eal/bsdapp/nic_uio/nic_uio.c
> +++ b/lib/librte_eal/bsdapp/nic_uio/nic_uio.c
> @@ -55,6 +55,9 @@ __FBSDID("$FreeBSD$");
>  
>  #define MAX_BARS (PCIR_MAX_BAR_0 + 1)
>  
> +#define MAX_DETACHED_DEVICES	128
> +static device_t detached_devices[MAX_DETACHED_DEVICES] = {};
> +static int num_detached = 0;
>  
>  struct nic_uio_softc {
>  	device_t        dev_t;
> @@ -288,17 +291,38 @@ nic_uio_load(void)
>  		function = strtol(token, NULL, 10);
>  
>  		dev = pci_find_bsf(bus, device, function);
> -		if (dev != NULL)
> -			for (i = 0; i < NUM_DEVICES; i++)
> -				if (pci_get_vendor(dev) == devices[i].vend &&
> -						pci_get_device(dev) == devices[i].dev)
> -							device_detach(dev);
> +		if (dev == NULL)
> +			continue;
> +		
> +		for (i = 0; i < NUM_DEVICES; i++)
> +			if (pci_get_vendor(dev) == devices[i].vend &&
> +					pci_get_device(dev) == devices[i].dev) {
> +						if (num_detached < MAX_DETACHED_DEVICES) {
> +							printf("nic_uio_load: detaching and storing dev=%p\n", dev);
> +							detached_devices[num_detached++] = dev;
> +						}
> +						else
> +							printf("nic_uio_load: reached MAX_DETACHED_DEVICES=%d. dev=%p won't be reattached\n",
> +								MAX_DETACHED_DEVICES, dev);
> +						device_detach(dev);
> +			}
>  	}
>  }
>  
>  static void
>  nic_uio_unload(void)
>  {
> +	int i;
> +	printf("nic_uio_unload: entered ... \n");
> +
> +	for (i = 0; i < num_detached; i++) {
> +		printf("nic_uio_unload: calling to device_probe_and_attach for dev=%p...\n",
> +			detached_devices[i]);
> +		device_probe_and_attach(detached_devices[i]);
> +		printf("nic_uio_unload: done.\n");
> +	}
> +
> +	printf("nic_uio_unload: leaving ... \n");
>  }
>  
>  static int
> -- 
> 2.1.2
>