Re: [PATCH v1 04/14] xen/arm: Add support for PCI init to initialize the PCI driver.

[Rahul Singh <Rahul.Singh@arm.com>]

Hi Julien,

> On 7 Sep 2021, at 9:20 am, Julien Grall <julien@xen.org> wrote:
> 
> Hi Rahul,
> 
> On 19/08/2021 13:02, Rahul Singh wrote:
>> pci_init(..) will be called during xen startup to initialize and probe
>> the PCI host-bridge driver.
>> Signed-off-by: Rahul Singh <rahul.singh@arm.com>
>> ---
>>  xen/arch/arm/pci/pci.c       | 54 ++++++++++++++++++++++++++++++++++++
>>  xen/include/asm-arm/device.h |  1 +
>>  2 files changed, 55 insertions(+)
>> diff --git a/xen/arch/arm/pci/pci.c b/xen/arch/arm/pci/pci.c
>> index dc55d23778..d1c9cf997d 100644
>> --- a/xen/arch/arm/pci/pci.c
>> +++ b/xen/arch/arm/pci/pci.c
>> @@ -14,13 +14,67 @@
>>   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
>>   */
>>  +#include <xen/acpi.h>
>> +#include <xen/device_tree.h>
>> +#include <xen/errno.h>
>> +#include <xen/init.h>
>>  #include <xen/pci.h>
>> +#include <xen/param.h>
> 
> This include doesn't look to be necessary (yet?).
 
Yes you are right this is not necessary .I will remove "param.h"
> 
>>    int arch_pci_clean_pirqs(struct domain *d)
>>  {
>>      return 0;
>>  }
>>  +static int __init dt_pci_init(void)
>> +{
>> +    struct dt_device_node *np;
>> +    int rc;
>> +
>> +    dt_for_each_device_node(dt_host, np)
>> +    {
>> +        rc = device_init(np, DEVICE_PCI, NULL);
>> +        if( !rc )
>> +            continue;
>> +        /*
>> +         * Ignore the following error codes:
>> +         *   - EBADF: Indicate the current is not an pci
>> +         *   - ENODEV: The pci device is not present or cannot be used by
>> +         *     Xen.
>> +         */
>> +        else if ( rc != -EBADF && rc != -ENODEV )
>> +        {
>> +            printk(XENLOG_ERR "No driver found in XEN or driver init error.\n");
>> +            return rc;
>> +        }
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +#ifdef CONFIG_ACPI
>> +static void __init acpi_pci_init(void)
>> +{
>> +    printk(XENLOG_ERR "ACPI pci init not supported \n");
>> +    return;
>> +}
>> +#else
>> +static inline void __init acpi_pci_init(void) { }
>> +#endif
>> +
>> +static int __init pci_init(void)
>> +{
>> +    if ( acpi_disabled )
>> +        dt_pci_init();
>> +    else
>> +        acpi_pci_init();
>> +
>> +    pci_segments_init();
> 
> Shouldn't this happen before the PCI initialization?

Calling pci_segment_init(..) before or after PCI initialization will not make any 
difference as this is independent call. Anyway I will move the pci_segment_init(..)  
before PCI initialization.

Regards,
Rahul