Re: [Qemu-devel] [PATCH v3 02/26] blockdev: Introduce IF_AHCI

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Oct 19, 2012 at 04:43:27PM -0400, Jason Baron wrote:
> From: Jason Baron <jbaron@redhat.com>
> 
> Introduce IF_AHCI so that q35 can differentiate between ide and ahci disks.
> This allows q35 to specify its default disk type. It also allows q35 to
> differentiate between ahci and ide disks, such that -drive if=ide does not
> result in the creating of an ahci disk. This is important, since we don't want
> to have the meaning of if=ide changing once q35 is introduced. Thus, its
> important for this to be applied before we introduce q35.
> 
> This patch also adds:
> 
> pci_ahci_create_devs(PCIDevice *pci_dev, DriveInfo **hd_table)
> 
> Which provides a convient way of attaching ahci drives to an
> ahci controller.
> 
> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Jason Baron <jbaron@redhat.com>
> ---

Kevin, could you review/ack this patch pls?

>  blockdev.c    |   13 ++++++++++++-
>  blockdev.h    |    2 ++
>  hw/ide.h      |    6 ++++++
>  hw/ide/ahci.c |   18 ++++++++++++++++++
>  hw/ide/core.c |   23 ++++++++++++++++++-----
>  5 files changed, 56 insertions(+), 6 deletions(-)
> 
> diff --git a/blockdev.c b/blockdev.c
> index c9a49c8..b684348 100644
> --- a/blockdev.c
> +++ b/blockdev.c
> @@ -33,6 +33,7 @@ static const char *const if_name[IF_COUNT] = {
>      [IF_SD] = "sd",
>      [IF_VIRTIO] = "virtio",
>      [IF_XEN] = "xen",
> +    [IF_AHCI] = "ahci",
>  };
>  
>  static const int if_max_devs[IF_COUNT] = {
> @@ -52,8 +53,17 @@ static const int if_max_devs[IF_COUNT] = {
>       */
>      [IF_IDE] = 2,
>      [IF_SCSI] = 7,
> +    [IF_AHCI] = 6,
>  };
>  
> +int get_if_max_devs(BlockInterfaceType if_type)
> +{
> +    assert(if_type < IF_COUNT);
> +    assert(if_type >= IF_DEFAULT);
> +
> +    return if_max_devs[if_type];
> +}
> +
>  /*
>   * We automatically delete the drive when a device using it gets
>   * unplugged.  Questionable feature, but we can't just drop it.
> @@ -518,7 +528,7 @@ DriveInfo *drive_init(QemuOpts *opts, int mach_if)
>      } else {
>          /* no id supplied -> create one */
>          dinfo->id = g_malloc0(32);
> -        if (type == IF_IDE || type == IF_SCSI)
> +        if (type == IF_IDE || type == IF_SCSI || type == IF_AHCI)
>              mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
>          if (max_devs)
>              snprintf(dinfo->id, 32, "%s%i%s%i",
> @@ -550,6 +560,7 @@ DriveInfo *drive_init(QemuOpts *opts, int mach_if)
>  
>      switch(type) {
>      case IF_IDE:
> +    case IF_AHCI:
>      case IF_SCSI:
>      case IF_XEN:
>      case IF_NONE:
> diff --git a/blockdev.h b/blockdev.h
> index 8b126ad..bbd1017 100644
> --- a/blockdev.h
> +++ b/blockdev.h
> @@ -21,6 +21,7 @@ typedef enum {
>      IF_DEFAULT = -1,            /* for use with drive_add() only */
>      IF_NONE,
>      IF_IDE, IF_SCSI, IF_FLOPPY, IF_PFLASH, IF_MTD, IF_SD, IF_VIRTIO, IF_XEN,
> +    IF_AHCI,
>      IF_COUNT
>  } BlockInterfaceType;
>  
> @@ -56,6 +57,7 @@ static inline int get_mach_if(int mach_if)
>      return mach_if;
>  }
>  
> +int get_if_max_devs(BlockInterfaceType if_type);
>  DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit);
>  DriveInfo *drive_get_by_index(BlockInterfaceType type, int index);
>  int drive_get_max_bus(BlockInterfaceType type);
> diff --git a/hw/ide.h b/hw/ide.h
> index 2db4079..0b7e000 100644
> --- a/hw/ide.h
> +++ b/hw/ide.h
> @@ -4,6 +4,7 @@
>  #include "isa.h"
>  #include "pci.h"
>  #include "memory.h"
> +#include "blockdev.h"
>  
>  #define MAX_IDE_DEVS	2
>  
> @@ -34,6 +35,11 @@ int ide_get_geometry(BusState *bus, int unit,
>  int ide_get_bios_chs_trans(BusState *bus, int unit);
>  
>  /* ide/core.c */
> +void ata_drive_get(DriveInfo **hd, int max_bus, BlockInterfaceType type);
>  void ide_drive_get(DriveInfo **hd, int max_bus);
> +void ahci_drive_get(DriveInfo **hd, int max_bus);
> +
> +/* ide/ahci.c */
> +void pci_ahci_create_devs(PCIDevice *pci_dev, DriveInfo **hd_table);
>  
>  #endif /* HW_IDE_H */
> diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
> index 68671bc..824b86f 100644
> --- a/hw/ide/ahci.c
> +++ b/hw/ide/ahci.c
> @@ -26,6 +26,7 @@
>  #include <hw/pc.h>
>  #include <hw/pci.h>
>  #include <hw/sysbus.h>
> +#include <blockdev.h>
>  
>  #include "monitor.h"
>  #include "dma.h"
> @@ -1260,3 +1261,20 @@ static void sysbus_ahci_register_types(void)
>  }
>  
>  type_init(sysbus_ahci_register_types)
> +
> +void pci_ahci_create_devs(PCIDevice *pci_dev, DriveInfo **hd_table)
> +{
> +    struct AHCIPCIState *dev = DO_UPCAST(struct AHCIPCIState, card, pci_dev);
> +    int i;
> +    DriveInfo *drive;
> +
> +    for (i = 0; i < dev->ahci.ports; i++) {
> +        if (hd_table[i] == NULL) {
> +            continue;
> +        }
> +        drive = hd_table[i];
> +        assert(drive->type == IF_AHCI);
> +        ide_create_drive(&dev->ahci.dev[i].port, 0,
> +                         hd_table[i]);
> +    }
> +}
> diff --git a/hw/ide/core.c b/hw/ide/core.c
> index d683a8c..044da3c 100644
> --- a/hw/ide/core.c
> +++ b/hw/ide/core.c
> @@ -2341,16 +2341,29 @@ const VMStateDescription vmstate_ide_bus = {
>      }
>  };
>  
> -void ide_drive_get(DriveInfo **hd, int max_bus)
> +void ata_drive_get(DriveInfo **hd, int max_bus, BlockInterfaceType type)
>  {
>      int i;
> +    int max_devs;
> +
> +    assert((type == IF_IDE) || type == IF_AHCI);
>  
> -    if (drive_get_max_bus(IF_IDE) >= max_bus) {
> +    if (drive_get_max_bus(type) >= max_bus) {
>          fprintf(stderr, "qemu: too many IDE bus: %d\n", max_bus);
>          exit(1);
>      }
> -
> -    for(i = 0; i < max_bus * MAX_IDE_DEVS; i++) {
> -        hd[i] = drive_get(IF_IDE, i / MAX_IDE_DEVS, i % MAX_IDE_DEVS);
> +    max_devs = get_if_max_devs(type);
> +    for (i = 0; i < max_bus * max_devs; i++) {
> +        hd[i] = drive_get(type, i / max_devs, i % max_devs);
>      }
>  }
> +
> +void ide_drive_get(DriveInfo **hd, int max_bus)
> +{
> +    ata_drive_get(hd, max_bus, IF_IDE);
> +}
> +
> +void ahci_drive_get(DriveInfo **hd, int max_bus)
> +{
> +    ata_drive_get(hd, max_bus, IF_AHCI);
> +}
> -- 
> 1.7.1