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qemu/hw/char/serial-pci-multi.c
Markus Armbruster 668f62ec62 error: Eliminate error_propagate() with Coccinelle, part 1 
When all we do with an Error we receive into a local variable is
propagating to somewhere else, we can just as well receive it there
right away.  Convert

    if (!foo(..., &err)) {
        ...
        error_propagate(errp, err);
        ...
        return ...
    }

to

    if (!foo(..., errp)) {
        ...
        ...
        return ...
    }

where nothing else needs @err.  Coccinelle script:

    @rule1 forall@
    identifier fun, err, errp, lbl;
    expression list args, args2;
    binary operator op;
    constant c1, c2;
    symbol false;
    @@
         if (
    (
    -        fun(args, &err, args2)
    +        fun(args, errp, args2)
    |
    -        !fun(args, &err, args2)
    +        !fun(args, errp, args2)
    |
    -        fun(args, &err, args2) op c1
    +        fun(args, errp, args2) op c1
    )
            )
         {
             ... when != err
                 when != lbl:
                 when strict
    -        error_propagate(errp, err);
             ... when != err
    (
             return;
    |
             return c2;
    |
             return false;
    )
         }

    @rule2 forall@
    identifier fun, err, errp, lbl;
    expression list args, args2;
    expression var;
    binary operator op;
    constant c1, c2;
    symbol false;
    @@
    -    var = fun(args, &err, args2);
    +    var = fun(args, errp, args2);
         ... when != err
         if (
    (
             var
    |
             !var
    |
             var op c1
    )
            )
         {
             ... when != err
                 when != lbl:
                 when strict
    -        error_propagate(errp, err);
             ... when != err
    (
             return;
    |
             return c2;
    |
             return false;
    |
             return var;
    )
         }

    @depends on rule1 || rule2@
    identifier err;
    @@
    -    Error *err = NULL;
         ... when != err

Not exactly elegant, I'm afraid.

The "when != lbl:" is necessary to avoid transforming

         if (fun(args, &err)) {
             goto out
         }
         ...
     out:
         error_propagate(errp, err);

even though other paths to label out still need the error_propagate().
For an actual example, see sclp_realize().

Without the "when strict", Coccinelle transforms vfio_msix_setup(),
incorrectly.  I don't know what exactly "when strict" does, only that
it helps here.

The match of return is narrower than what I want, but I can't figure
out how to express "return where the operand doesn't use @err".  For
an example where it's too narrow, see vfio_intx_enable().

Silently fails to convert hw/arm/armsse.c, because Coccinelle gets
confused by ARMSSE being used both as typedef and function-like macro
there.  Converted manually.

Line breaks tidied up manually.  One nested declaration of @local_err
deleted manually.  Preexisting unwanted blank line dropped in
hw/riscv/sifive_e.c.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200707160613.848843-35-armbru@redhat.com>
2020-07-10 15:18:08 +02:00

222 lines
7.3 KiB
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/*
* QEMU 16550A multi UART emulation
*
* SPDX-License-Identifier: MIT
*
* Copyright (c) 2003-2004 Fabrice Bellard
* Copyright (c) 2008 Citrix Systems, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/* see docs/specs/pci-serial.txt */
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/char/serial.h"
#include "hw/irq.h"
#include "hw/pci/pci.h"
#include "hw/qdev-properties.h"
#include "migration/vmstate.h"
#define PCI_SERIAL_MAX_PORTS 4
typedef struct PCIMultiSerialState {
PCIDevice dev;
MemoryRegion iobar;
uint32_t ports;
char *name[PCI_SERIAL_MAX_PORTS];
SerialState state[PCI_SERIAL_MAX_PORTS];
uint32_t level[PCI_SERIAL_MAX_PORTS];
qemu_irq *irqs;
uint8_t prog_if;
} PCIMultiSerialState;
static void multi_serial_pci_exit(PCIDevice *dev)
{
PCIMultiSerialState *pci = DO_UPCAST(PCIMultiSerialState, dev, dev);
SerialState *s;
int i;
for (i = 0; i < pci->ports; i++) {
s = pci->state + i;
qdev_unrealize(DEVICE(s));
memory_region_del_subregion(&pci->iobar, &s->io);
g_free(pci->name[i]);
}
qemu_free_irqs(pci->irqs, pci->ports);
}
static void multi_serial_irq_mux(void *opaque, int n, int level)
{
PCIMultiSerialState *pci = opaque;
int i, pending = 0;
pci->level[n] = level;
for (i = 0; i < pci->ports; i++) {
if (pci->level[i]) {
pending = 1;
}
}
pci_set_irq(&pci->dev, pending);
}
static size_t multi_serial_get_port_count(PCIDeviceClass *pc)
{
switch (pc->device_id) {
case 0x0003:
return 2;
case 0x0004:
return 4;
}
g_assert_not_reached();
}
static void multi_serial_pci_realize(PCIDevice *dev, Error **errp)
{
PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
PCIMultiSerialState *pci = DO_UPCAST(PCIMultiSerialState, dev, dev);
SerialState *s;
size_t i, nports = multi_serial_get_port_count(pc);
pci->dev.config[PCI_CLASS_PROG] = pci->prog_if;
pci->dev.config[PCI_INTERRUPT_PIN] = 0x01;
memory_region_init(&pci->iobar, OBJECT(pci), "multiserial", 8 * nports);
pci_register_bar(&pci->dev, 0, PCI_BASE_ADDRESS_SPACE_IO, &pci->iobar);
pci->irqs = qemu_allocate_irqs(multi_serial_irq_mux, pci, nports);
for (i = 0; i < nports; i++) {
s = pci->state + i;
if (!qdev_realize(DEVICE(s), NULL, errp)) {
multi_serial_pci_exit(dev);
return;
}
s->irq = pci->irqs[i];
pci->name[i] = g_strdup_printf("uart #%zu", i + 1);
memory_region_init_io(&s->io, OBJECT(pci), &serial_io_ops, s,
pci->name[i], 8);
memory_region_add_subregion(&pci->iobar, 8 * i, &s->io);
pci->ports++;
}
}
static const VMStateDescription vmstate_pci_multi_serial = {
.name = "pci-serial-multi",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_PCI_DEVICE(dev, PCIMultiSerialState),
VMSTATE_STRUCT_ARRAY(state, PCIMultiSerialState, PCI_SERIAL_MAX_PORTS,
0, vmstate_serial, SerialState),
VMSTATE_UINT32_ARRAY(level, PCIMultiSerialState, PCI_SERIAL_MAX_PORTS),
VMSTATE_END_OF_LIST()
}
};
static Property multi_2x_serial_pci_properties[] = {
DEFINE_PROP_CHR("chardev1", PCIMultiSerialState, state[0].chr),
DEFINE_PROP_CHR("chardev2", PCIMultiSerialState, state[1].chr),
DEFINE_PROP_UINT8("prog_if", PCIMultiSerialState, prog_if, 0x02),
DEFINE_PROP_END_OF_LIST(),
};
static Property multi_4x_serial_pci_properties[] = {
DEFINE_PROP_CHR("chardev1", PCIMultiSerialState, state[0].chr),
DEFINE_PROP_CHR("chardev2", PCIMultiSerialState, state[1].chr),
DEFINE_PROP_CHR("chardev3", PCIMultiSerialState, state[2].chr),
DEFINE_PROP_CHR("chardev4", PCIMultiSerialState, state[3].chr),
DEFINE_PROP_UINT8("prog_if", PCIMultiSerialState, prog_if, 0x02),
DEFINE_PROP_END_OF_LIST(),
};
static void multi_2x_serial_pci_class_initfn(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *pc = PCI_DEVICE_CLASS(klass);
pc->realize = multi_serial_pci_realize;
pc->exit = multi_serial_pci_exit;
pc->vendor_id = PCI_VENDOR_ID_REDHAT;
pc->device_id = PCI_DEVICE_ID_REDHAT_SERIAL2;
pc->revision = 1;
pc->class_id = PCI_CLASS_COMMUNICATION_SERIAL;
dc->vmsd = &vmstate_pci_multi_serial;
device_class_set_props(dc, multi_2x_serial_pci_properties);
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
}
static void multi_4x_serial_pci_class_initfn(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *pc = PCI_DEVICE_CLASS(klass);
pc->realize = multi_serial_pci_realize;
pc->exit = multi_serial_pci_exit;
pc->vendor_id = PCI_VENDOR_ID_REDHAT;
pc->device_id = PCI_DEVICE_ID_REDHAT_SERIAL4;
pc->revision = 1;
pc->class_id = PCI_CLASS_COMMUNICATION_SERIAL;
dc->vmsd = &vmstate_pci_multi_serial;
device_class_set_props(dc, multi_4x_serial_pci_properties);
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
}
static void multi_serial_init(Object *o)
{
PCIDevice *dev = PCI_DEVICE(o);
PCIMultiSerialState *pms = DO_UPCAST(PCIMultiSerialState, dev, dev);
size_t i, nports = multi_serial_get_port_count(PCI_DEVICE_GET_CLASS(dev));
for (i = 0; i < nports; i++) {
object_initialize_child(o, "serial[*]", &pms->state[i], TYPE_SERIAL);
}
}
static const TypeInfo multi_2x_serial_pci_info = {
.name = "pci-serial-2x",
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(PCIMultiSerialState),
.instance_init = multi_serial_init,
.class_init = multi_2x_serial_pci_class_initfn,
.interfaces = (InterfaceInfo[]) {
{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
{ },
},
};
static const TypeInfo multi_4x_serial_pci_info = {
.name = "pci-serial-4x",
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(PCIMultiSerialState),
.instance_init = multi_serial_init,
.class_init = multi_4x_serial_pci_class_initfn,
.interfaces = (InterfaceInfo[]) {
{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
{ },
},
};
static void multi_serial_pci_register_types(void)
{
type_register_static(&multi_2x_serial_pci_info);
type_register_static(&multi_4x_serial_pci_info);
}
type_init(multi_serial_pci_register_types)
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