Re: [Qemu-devel] [PATCH v2 1/2] Minimal RAM API support

[Anthony Liguori <anthony@codemonkey.ws>]

On 11/01/2010 10:14 AM, Alex Williamson wrote:
> This adds a minimum chunk of Anthony's RAM API support so that we
> can identify actual VM RAM versus all the other things that make
> use of qemu_ram_alloc.
>
> Signed-off-by: Alex Williamson<alex.williamson@redhat.com>
> ---
>
>   Makefile.objs |    1 +
>   cpu-common.h  |    2 +
>   memory.c      |  109 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>   memory.h      |   18 +++++++++
>   4 files changed, 130 insertions(+), 0 deletions(-)
>   create mode 100644 memory.c
>   create mode 100644 memory.h
>
> diff --git a/Makefile.objs b/Makefile.objs
> index f07fb01..33fae0b 100644
> --- a/Makefile.objs
> +++ b/Makefile.objs
> @@ -154,6 +154,7 @@ hw-obj-y += vl.o loader.o
>   hw-obj-y += virtio.o virtio-console.o
>   hw-obj-y += fw_cfg.o pci.o pci_host.o pcie_host.o
>   hw-obj-y += watchdog.o
> +hw-obj-y += memory.o
>   hw-obj-$(CONFIG_ISA_MMIO) += isa_mmio.o
>   hw-obj-$(CONFIG_ECC) += ecc.o
>   hw-obj-$(CONFIG_NAND) += nand.o
> diff --git a/cpu-common.h b/cpu-common.h
> index a543b5d..6aa2738 100644
> --- a/cpu-common.h
> +++ b/cpu-common.h
> @@ -23,6 +23,8 @@
>   /* address in the RAM (different from a physical address) */
>   typedef unsigned long ram_addr_t;
>
> +#include "memory.h"
> +
>   /* memory API */
>
>   typedef void CPUWriteMemoryFunc(void *opaque, target_phys_addr_t addr, uint32_t value);
> diff --git a/memory.c b/memory.c
> new file mode 100644
> index 0000000..2895082
> --- /dev/null
> +++ b/memory.c
> @@ -0,0 +1,109 @@
> +/*
> + * RAM API
> + *
> + *  Copyright Red Hat, Inc. 2010
> + *
> + * Authors:
> + *  Alex Williamson<alex.williamson@redhat.com>
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2 of the License, or (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library; if not, see<http://www.gnu.org/licenses/>.
> + */
> +#include "memory.h"
> +#include "range.h"
> +
> +typedef struct QemuRamSlot {
> +    target_phys_addr_t start_addr;
> +    ram_addr_t size;
> +    ram_addr_t offset;
> +    QLIST_ENTRY(QemuRamSlot) next;
> +} QemuRamSlot;
> +
> +typedef struct QemuRamSlots {
> +    QLIST_HEAD(slots, QemuRamSlot) slots;
> +} QemuRamSlots;
>    

No need for all of the 'Qemu' prefixes.

> +
> +static QemuRamSlots ram_slots = { .slots = QLIST_HEAD_INITIALIZER(ram_slots) };
>    

Might be nicer to just typedef the extra struct away.

> +static QemuRamSlot *qemu_ram_find_slot(target_phys_addr_t start_addr,
> +                                       ram_addr_t size)
> +{
> +    QemuRamSlot *slot;
> +
> +    QLIST_FOREACH(slot,&ram_slots.slots, next) {
> +        if (slot->start_addr == start_addr&&  slot->size == size) {
> +            return slot;
> +        }
> +
> +        if (ranges_overlap(start_addr, size, slot->start_addr, slot->size)) {
> +            abort();
>    

Should display a message before aborting.

> +        }
> +    }
> +
> +    return NULL;
> +}
> +
> +int qemu_ram_register(target_phys_addr_t start_addr, ram_addr_t size,
> +                       ram_addr_t phys_offset)
> +{
> +    QemuRamSlot *slot;
> +
> +    if (!size) {
> +        return -EINVAL;
> +    }
> +
> +    assert(!qemu_ram_find_slot(start_addr, size));
> +
> +    slot = qemu_mallocz(sizeof(QemuRamSlot));
> +
> +    slot->start_addr = start_addr;
> +    slot->size = size;
> +    slot->offset = phys_offset;
> +
> +    QLIST_INSERT_HEAD(&ram_slots.slots, slot, next);
> +
> +    cpu_register_physical_memory(slot->start_addr, slot->size, slot->offset);
> +
> +    return 0;
> +}
> +
> +void qemu_ram_unregister(target_phys_addr_t start_addr, ram_addr_t size)
> +{
> +    QemuRamSlot *slot;
> +
> +    if (!size) {
> +        return;
> +    }
> +
> +    slot = qemu_ram_find_slot(start_addr, size);
> +    assert(slot != NULL);
> +
> +    QLIST_REMOVE(slot, next);
> +    qemu_free(slot);
> +    cpu_register_physical_memory(start_addr, size, IO_MEM_UNASSIGNED);
> +
> +    return;
> +}
> +
> +int qemu_ram_for_each_slot(void *opaque, qemu_ram_for_each_slot_fn fn)
> +{
> +    QemuRamSlot *slot;
> +
> +    QLIST_FOREACH(slot,&ram_slots.slots, next) {
> +        int ret = fn(opaque, slot->start_addr, slot->size, slot->offset);
> +        if (ret) {
> +            return ret;
> +        }
> +    }
> +    return 0;
> +}
> diff --git a/memory.h b/memory.h
> new file mode 100644
> index 0000000..0c17ff9
> --- /dev/null
> +++ b/memory.h
> @@ -0,0 +1,18 @@
> +#ifndef QEMU_MEMORY_H
> +#define QEMU_MEMORY_H
> +
> +#include "qemu-common.h"
> +#include "cpu-common.h"
>    

Header needs copyright and would be nice to have some comments 
explaining these functions.

Regards,

Anthony Liguori

> +int qemu_ram_register(target_phys_addr_t start_addr, ram_addr_t size,
> +                      ram_addr_t phys_offset);
> +
> +void qemu_ram_unregister(target_phys_addr_t start_addr, ram_addr_t size);
> +
> +typedef int (*qemu_ram_for_each_slot_fn)(void *opaque,
> +                                         target_phys_addr_t start_addr,
> +                                         ram_addr_t size,
> +                                         ram_addr_t phys_offset);
> +
> +int qemu_ram_for_each_slot(void *opaque, qemu_ram_for_each_slot_fn fn);
> +#endif
>
>
>
>