From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:39024)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <zealot351@gmail.com>) id 1bf5sk-0000HM-5e
	for qemu-devel@nongnu.org; Wed, 31 Aug 2016 09:48:47 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <zealot351@gmail.com>) id 1bf5sj-0007iy-6w
	for qemu-devel@nongnu.org; Wed, 31 Aug 2016 09:48:46 -0400
Received: from mail-lf0-x22c.google.com ([2a00:1450:4010:c07::22c]:33445)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <zealot351@gmail.com>) id 1bf5si-0007iQ-RA
	for qemu-devel@nongnu.org; Wed, 31 Aug 2016 09:48:45 -0400
Received: by mail-lf0-x22c.google.com with SMTP id b199so37510439lfe.0
	for <qemu-devel@nongnu.org>; Wed, 31 Aug 2016 06:48:43 -0700 (PDT)
MIME-Version: 1.0
From: =?UTF-8?B?0JTQtdC90LjRgSDQlNC80LjRgtGA0LjQtdCy?= <zealot351@gmail.com>
Date: Wed, 31 Aug 2016 16:48:42 +0300
Message-ID: <CAF3nGXcHFxr510n+kMzZSogWUED09bWP0fmC-aC82nxJ6Cp_WQ@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
Subject: [Qemu-devel] Implementation of BusLogic SCSI host adapter (BT-958)
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel/>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: qemu-devel@nongnu.org
Cc: Pavel Dovgaluk <pavel.dovgaluk@ispras.ru>, pbonzini@redhat.com

Hi,
I'm trying to implement a buslogic scsi adapter(BT-958) for qemu. I
realized the driver interaction with the ports through which the driver can
write / read commands and parameters for the adapter. The driver was able
to make an adapter sample procedure. The problem is that I do not
understand how to establish communication between the driver and adapter
for transferring mailboxes. I got the address of the mailboxes from the
driver. Then I calculated the start address of the desired mailbox (the
same address to which a driver recorded a mailbox). After that, I try to
read the data at this address using pci_dma_read function but no buffer
data after reading.


uint64_t buslogicReadOutgoingMailbox(BuslogicState *s, BUSLOGICTASKSTATE
*TaskState)
{
    uint64_t    GCMailbox;
    Mailbox24   Mbx24;
    Mbx24.uCmdState = 0;
    PCIDevice *pci_dev = PCI_DEVICE(s);
    if (s->fMbxIs24Bit)
    {
        //try to calculate mailbox address
        GCMailbox = s->GCPhysAddrMailboxOutgoingBase +
(s->uMailboxOutgoingPositionCurrent * sizeof(Mailbox24));
        //try to read mailbox
        pci_dma_read(pci_dev, GCMailbox, &Mbx24, sizeof(Mailbox24));
        //after that i  have empty buffer
        TaskState->MailboxGuest.u32PhysAddrCCB    =
ADDR_TO_U32(Mbx24.aPhysAddrCCB);
        TaskState->MailboxGuest.u.out.uActionCode = Mbx24.uCmdState;
    }
    else
    {
        GCMailbox = s->GCPhysAddrMailboxOutgoingBase +
(s->uMailboxOutgoingPositionCurrent * sizeof(Mailbox32));
        pci_dma_read(pci_dev, GCMailbox, &TaskState->MailboxGuest,
sizeof(Mailbox32));
    }
    return GCMailbox;
}