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FRET-qemu/hw/sd/aspeed_sdhci.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

199 lines
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/*
* Aspeed SD Host Controller
* Eddie James <eajames@linux.ibm.com>
*
* Copyright (C) 2019 IBM Corp
* SPDX-License-Identifer: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/error-report.h"
#include "hw/sd/aspeed_sdhci.h"
#include "qapi/error.h"
#include "hw/irq.h"
#include "migration/vmstate.h"
#include "hw/qdev-properties.h"
#define ASPEED_SDHCI_INFO 0x00
#define ASPEED_SDHCI_INFO_RESET 0x00030000
#define ASPEED_SDHCI_DEBOUNCE 0x04
#define ASPEED_SDHCI_DEBOUNCE_RESET 0x00000005
#define ASPEED_SDHCI_BUS 0x08
#define ASPEED_SDHCI_SDIO_140 0x10
#define ASPEED_SDHCI_SDIO_148 0x18
#define ASPEED_SDHCI_SDIO_240 0x20
#define ASPEED_SDHCI_SDIO_248 0x28
#define ASPEED_SDHCI_WP_POL 0xec
#define ASPEED_SDHCI_CARD_DET 0xf0
#define ASPEED_SDHCI_IRQ_STAT 0xfc
#define TO_REG(addr) ((addr) / sizeof(uint32_t))
static uint64_t aspeed_sdhci_read(void *opaque, hwaddr addr, unsigned int size)
{
uint32_t val = 0;
AspeedSDHCIState *sdhci = opaque;
switch (addr) {
case ASPEED_SDHCI_SDIO_140:
val = (uint32_t)sdhci->slots[0].capareg;
break;
case ASPEED_SDHCI_SDIO_148:
val = (uint32_t)sdhci->slots[0].maxcurr;
break;
case ASPEED_SDHCI_SDIO_240:
val = (uint32_t)sdhci->slots[1].capareg;
break;
case ASPEED_SDHCI_SDIO_248:
val = (uint32_t)sdhci->slots[1].maxcurr;
break;
default:
if (addr < ASPEED_SDHCI_REG_SIZE) {
val = sdhci->regs[TO_REG(addr)];
} else {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Out-of-bounds read at 0x%" HWADDR_PRIx "\n",
__func__, addr);
}
}
return (uint64_t)val;
}
static void aspeed_sdhci_write(void *opaque, hwaddr addr, uint64_t val,
unsigned int size)
{
AspeedSDHCIState *sdhci = opaque;
switch (addr) {
case ASPEED_SDHCI_SDIO_140:
sdhci->slots[0].capareg = (uint64_t)(uint32_t)val;
break;
case ASPEED_SDHCI_SDIO_148:
sdhci->slots[0].maxcurr = (uint64_t)(uint32_t)val;
break;
case ASPEED_SDHCI_SDIO_240:
sdhci->slots[1].capareg = (uint64_t)(uint32_t)val;
break;
case ASPEED_SDHCI_SDIO_248:
sdhci->slots[1].maxcurr = (uint64_t)(uint32_t)val;
break;
default:
if (addr < ASPEED_SDHCI_REG_SIZE) {
sdhci->regs[TO_REG(addr)] = (uint32_t)val;
} else {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Out-of-bounds write at 0x%" HWADDR_PRIx "\n",
__func__, addr);
}
}
}
static const MemoryRegionOps aspeed_sdhci_ops = {
.read = aspeed_sdhci_read,
.write = aspeed_sdhci_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid.min_access_size = 4,
.valid.max_access_size = 4,
};
static void aspeed_sdhci_set_irq(void *opaque, int n, int level)
{
AspeedSDHCIState *sdhci = opaque;
if (level) {
sdhci->regs[TO_REG(ASPEED_SDHCI_IRQ_STAT)] |= BIT(n);
qemu_irq_raise(sdhci->irq);
} else {
sdhci->regs[TO_REG(ASPEED_SDHCI_IRQ_STAT)] &= ~BIT(n);
qemu_irq_lower(sdhci->irq);
}
}
static void aspeed_sdhci_realize(DeviceState *dev, Error **errp)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
AspeedSDHCIState *sdhci = ASPEED_SDHCI(dev);
/* Create input irqs for the slots */
qdev_init_gpio_in_named_with_opaque(DEVICE(sbd), aspeed_sdhci_set_irq,
sdhci, NULL, sdhci->num_slots);
sysbus_init_irq(sbd, &sdhci->irq);
memory_region_init_io(&sdhci->iomem, OBJECT(sdhci), &aspeed_sdhci_ops,
sdhci, TYPE_ASPEED_SDHCI, 0x1000);
sysbus_init_mmio(sbd, &sdhci->iomem);
for (int i = 0; i < sdhci->num_slots; ++i) {
Object *sdhci_slot = OBJECT(&sdhci->slots[i]);
SysBusDevice *sbd_slot = SYS_BUS_DEVICE(&sdhci->slots[i]);
if (!object_property_set_int(sdhci_slot, "sd-spec-version", 2, errp)) {
return;
}
if (!object_property_set_uint(sdhci_slot, "capareg",
ASPEED_SDHCI_CAPABILITIES, errp)) {
return;
}
if (!sysbus_realize(sbd_slot, errp)) {
return;
}
sysbus_connect_irq(sbd_slot, 0, qdev_get_gpio_in(DEVICE(sbd), i));
memory_region_add_subregion(&sdhci->iomem, (i + 1) * 0x100,
&sdhci->slots[i].iomem);
}
}
static void aspeed_sdhci_reset(DeviceState *dev)
{
AspeedSDHCIState *sdhci = ASPEED_SDHCI(dev);
memset(sdhci->regs, 0, ASPEED_SDHCI_REG_SIZE);
sdhci->regs[TO_REG(ASPEED_SDHCI_INFO)] = ASPEED_SDHCI_INFO_RESET;
sdhci->regs[TO_REG(ASPEED_SDHCI_DEBOUNCE)] = ASPEED_SDHCI_DEBOUNCE_RESET;
}
static const VMStateDescription vmstate_aspeed_sdhci = {
.name = TYPE_ASPEED_SDHCI,
.version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(regs, AspeedSDHCIState, ASPEED_SDHCI_NUM_REGS),
VMSTATE_END_OF_LIST(),
},
};
static Property aspeed_sdhci_properties[] = {
DEFINE_PROP_UINT8("num-slots", AspeedSDHCIState, num_slots, 0),
DEFINE_PROP_END_OF_LIST(),
};
static void aspeed_sdhci_class_init(ObjectClass *classp, void *data)
{
DeviceClass *dc = DEVICE_CLASS(classp);
dc->realize = aspeed_sdhci_realize;
dc->reset = aspeed_sdhci_reset;
dc->vmsd = &vmstate_aspeed_sdhci;
device_class_set_props(dc, aspeed_sdhci_properties);
}
static TypeInfo aspeed_sdhci_info = {
.name = TYPE_ASPEED_SDHCI,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(AspeedSDHCIState),
.class_init = aspeed_sdhci_class_init,
};
static void aspeed_sdhci_register_types(void)
{
type_register_static(&aspeed_sdhci_info);
}
type_init(aspeed_sdhci_register_types)
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