Re: [PATCH v5 03/29] hw/intc/aspeed: Introduce dynamic allocation for regs array

[Cédric Le Goater]

On 3/6/25 11:38, Jamin Lin wrote:

Currently, the size of the "regs" array is 0x2000, which is too large. To save
code size and avoid mapping large unused gaps, will update it to only map the
useful set of registers. This update will support multiple sub-regions with
different sizes.

To address the redundant size issue, replace the static "regs" array with a
dynamically allocated "regs" memory.

Introduce a new "aspeed_intc_unrealize" function to free the allocated "regs"
memory.

Signed-off-by: Jamin Lin <jamin_...@aspeedtech.com>
---
  include/hw/intc/aspeed_intc.h |  2 +-
  hw/intc/aspeed_intc.c         | 12 +++++++++++-
  2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/include/hw/intc/aspeed_intc.h b/include/hw/intc/aspeed_intc.h
index 03324f05ab..47ea0520b5 100644
--- a/include/hw/intc/aspeed_intc.h
+++ b/include/hw/intc/aspeed_intc.h
@@ -27,7 +27,7 @@ struct AspeedINTCState {
      MemoryRegion iomem;
      MemoryRegion iomem_container;

- uint32_t regs[ASPEED_INTC_NR_REGS];

+    uint32_t *regs;
      OrIRQState orgates[ASPEED_INTC_NR_INTS];
      qemu_irq output_pins[ASPEED_INTC_NR_INTS];

diff --git a/hw/intc/aspeed_intc.c b/hw/intc/aspeed_intc.c

index 465f41e4fd..feb2c52441 100644
--- a/hw/intc/aspeed_intc.c
+++ b/hw/intc/aspeed_intc.c
@@ -289,7 +289,7 @@ static void aspeed_intc_reset(DeviceState *dev)
  {
      AspeedINTCState *s = ASPEED_INTC(dev);

- memset(s->regs, 0, sizeof(s->regs));

+    memset(s->regs, 0, ASPEED_INTC_NR_REGS);

this is not the same size. s->regs is larger than ASPEED_INTC_NR_REGS.

      memset(s->enable, 0, sizeof(s->enable));
      memset(s->mask, 0, sizeof(s->mask));
      memset(s->pending, 0, sizeof(s->pending));
@@ -307,6 +307,7 @@ static void aspeed_intc_realize(DeviceState *dev, Error 
**errp)

sysbus_init_mmio(sbd, &s->iomem_container); + s->regs = g_malloc0(ASPEED_INTC_NR_REGS);

please use g_new(....)


Thanks,

C.

      memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_intc_ops, s,
                            TYPE_ASPEED_INTC ".regs", ASPEED_INTC_NR_REGS << 2);

@@ -322,12 +323,21 @@ static void aspeed_intc_realize(DeviceState *dev, Error **errp)

      }
  }

+static void aspeed_intc_unrealize(DeviceState *dev)

+{
+    AspeedINTCState *s = ASPEED_INTC(dev);
+
+    g_free(s->regs);
+    s->regs = NULL;
+}
+
  static void aspeed_intc_class_init(ObjectClass *klass, void *data)
  {
      DeviceClass *dc = DEVICE_CLASS(klass);

dc->desc = "ASPEED INTC Controller";

      dc->realize = aspeed_intc_realize;
+    dc->unrealize = aspeed_intc_unrealize;
      device_class_set_legacy_reset(dc, aspeed_intc_reset);
      dc->vmsd = NULL;
  }