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Re: [PATCH 06/13] hw/ide: Extract bmdma_init_ops()


From: Mark Cave-Ayland
Subject: Re: [PATCH 06/13] hw/ide: Extract bmdma_init_ops()
Date: Wed, 26 Apr 2023 12:14:25 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.13.0

On 22/04/2023 16:07, Bernhard Beschow wrote:

There are three private copies of bmdma_setup_bar() with small adaptions.
Consolidate them into one public implementation.

While at it rename the function to bmdma_init_ops() to reflect that the memory
regions being initialized represent BMDMA operations. The actual mapping as a
PCI BAR is still performed separately in each device.

Note that the bmdma_bar attribute will be renamed in a separate commit.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
---
  include/hw/ide/pci.h |  1 +
  hw/ide/cmd646.c      | 20 +-------------------
  hw/ide/pci.c         | 16 ++++++++++++++++
  hw/ide/piix.c        | 19 +------------------
  hw/ide/via.c         | 19 +------------------
  5 files changed, 20 insertions(+), 55 deletions(-)

diff --git a/include/hw/ide/pci.h b/include/hw/ide/pci.h
index 7bc4e53d02..597c77c7ad 100644
--- a/include/hw/ide/pci.h
+++ b/include/hw/ide/pci.h
@@ -57,6 +57,7 @@ struct PCIIDEState {
  };
void bmdma_init(IDEBus *bus, BMDMAState *bm, PCIIDEState *d);
+void bmdma_init_ops(PCIIDEState *d, const MemoryRegionOps *bmdma_ops);
  void bmdma_cmd_writeb(BMDMAState *bm, uint32_t val);
  extern MemoryRegionOps bmdma_addr_ioport_ops;
  void pci_ide_create_devs(PCIDevice *dev);
diff --git a/hw/ide/cmd646.c b/hw/ide/cmd646.c
index 9aabf80e52..6fd09fe74e 100644
--- a/hw/ide/cmd646.c
+++ b/hw/ide/cmd646.c
@@ -161,24 +161,6 @@ static const MemoryRegionOps cmd646_bmdma_ops = {
      .write = bmdma_write,
  };
-static void bmdma_setup_bar(PCIIDEState *d)
-{
-    BMDMAState *bm;
-    int i;
-
-    memory_region_init(&d->bmdma_bar, OBJECT(d), "cmd646-bmdma", 16);
-    for(i = 0;i < 2; i++) {
-        bm = &d->bmdma[i];
-        memory_region_init_io(&bm->extra_io, OBJECT(d), &cmd646_bmdma_ops, bm,
-                              "cmd646-bmdma-bus", 4);
-        memory_region_add_subregion(&d->bmdma_bar, i * 8, &bm->extra_io);
-        memory_region_init_io(&bm->addr_ioport, OBJECT(d),
-                              &bmdma_addr_ioport_ops, bm,
-                              "cmd646-bmdma-ioport", 4);
-        memory_region_add_subregion(&d->bmdma_bar, i * 8 + 4, 
&bm->addr_ioport);
-    }
-}
-
  static void cmd646_update_irq(PCIDevice *pd)
  {
      int pci_level;
@@ -285,7 +267,7 @@ static void pci_cmd646_ide_realize(PCIDevice *dev, Error 
**errp)
                            &d->bus[1], "cmd646-cmd1", 4);
      pci_register_bar(dev, 3, PCI_BASE_ADDRESS_SPACE_IO, &d->cmd_bar[1]);
- bmdma_setup_bar(d);
+    bmdma_init_ops(d, &cmd646_bmdma_ops);
      pci_register_bar(dev, 4, PCI_BASE_ADDRESS_SPACE_IO, &d->bmdma_bar);
/* TODO: RST# value should be 0 */
diff --git a/hw/ide/pci.c b/hw/ide/pci.c
index 8bea92e394..65ed6f7f72 100644
--- a/hw/ide/pci.c
+++ b/hw/ide/pci.c
@@ -523,6 +523,22 @@ void bmdma_init(IDEBus *bus, BMDMAState *bm, PCIIDEState 
*d)
      bm->pci_dev = d;
  }
+void bmdma_init_ops(PCIIDEState *d, const MemoryRegionOps *bmdma_ops)
+{
+    size_t i;
+
+    memory_region_init(&d->bmdma_bar, OBJECT(d), "bmdma-container", 16);
+    for (i = 0; i < ARRAY_SIZE(d->bmdma); i++) {
+        BMDMAState *bm = &d->bmdma[i];
+
+        memory_region_init_io(&bm->extra_io, OBJECT(d), bmdma_ops, bm, 
"bmdma-ops", 4);
+        memory_region_add_subregion(&d->bmdma_bar, i * 8, &bm->extra_io);
+        memory_region_init_io(&bm->addr_ioport, OBJECT(d), 
&bmdma_addr_ioport_ops, bm,
+                              "bmdma-ioport-ops", 4);
+        memory_region_add_subregion(&d->bmdma_bar, i * 8 + 4, 
&bm->addr_ioport);
+    }
+}
+
  static void pci_ide_init(Object *obj)
  {
      PCIIDEState *d = PCI_IDE(obj);
diff --git a/hw/ide/piix.c b/hw/ide/piix.c
index 4e6ca99123..5611473d37 100644
--- a/hw/ide/piix.c
+++ b/hw/ide/piix.c
@@ -86,23 +86,6 @@ static const MemoryRegionOps piix_bmdma_ops = {
      .write = bmdma_write,
  };
-static void bmdma_setup_bar(PCIIDEState *d)
-{
-    int i;
-
-    memory_region_init(&d->bmdma_bar, OBJECT(d), "piix-bmdma-container", 16);
-    for(i = 0;i < 2; i++) {
-        BMDMAState *bm = &d->bmdma[i];
-
-        memory_region_init_io(&bm->extra_io, OBJECT(d), &piix_bmdma_ops, bm,
-                              "piix-bmdma", 4);
-        memory_region_add_subregion(&d->bmdma_bar, i * 8, &bm->extra_io);
-        memory_region_init_io(&bm->addr_ioport, OBJECT(d),
-                              &bmdma_addr_ioport_ops, bm, "bmdma", 4);
-        memory_region_add_subregion(&d->bmdma_bar, i * 8 + 4, 
&bm->addr_ioport);
-    }
-}
-
  static void piix_ide_reset(DeviceState *dev)
  {
      PCIIDEState *d = PCI_IDE(dev);
@@ -156,7 +139,7 @@ static void pci_piix_ide_realize(PCIDevice *dev, Error 
**errp)
pci_conf[PCI_CLASS_PROG] = 0x80; // legacy ATA mode - bmdma_setup_bar(d);
+    bmdma_init_ops(d, &piix_bmdma_ops);
      pci_register_bar(dev, 4, PCI_BASE_ADDRESS_SPACE_IO, &d->bmdma_bar);
for (unsigned i = 0; i < 2; i++) {
diff --git a/hw/ide/via.c b/hw/ide/via.c
index 287143a005..40704e2857 100644
--- a/hw/ide/via.c
+++ b/hw/ide/via.c
@@ -86,23 +86,6 @@ static const MemoryRegionOps via_bmdma_ops = {
      .write = bmdma_write,
  };
-static void bmdma_setup_bar(PCIIDEState *d)
-{
-    int i;
-
-    memory_region_init(&d->bmdma_bar, OBJECT(d), "via-bmdma-container", 16);
-    for (i = 0; i < ARRAY_SIZE(d->bmdma); i++) {
-        BMDMAState *bm = &d->bmdma[i];
-
-        memory_region_init_io(&bm->extra_io, OBJECT(d), &via_bmdma_ops, bm,
-                              "via-bmdma", 4);
-        memory_region_add_subregion(&d->bmdma_bar, i * 8, &bm->extra_io);
-        memory_region_init_io(&bm->addr_ioport, OBJECT(d),
-                              &bmdma_addr_ioport_ops, bm, "bmdma", 4);
-        memory_region_add_subregion(&d->bmdma_bar, i * 8 + 4, 
&bm->addr_ioport);
-    }
-}
-
  static void via_ide_set_irq(void *opaque, int n, int level)
  {
      PCIIDEState *s = opaque;
@@ -187,7 +170,7 @@ static void via_ide_realize(PCIDevice *dev, Error **errp)
                            &d->bus[1], "via-ide1-cmd", 4);
      pci_register_bar(dev, 3, PCI_BASE_ADDRESS_SPACE_IO, &d->cmd_bar[1]);
- bmdma_setup_bar(d);
+    bmdma_init_ops(d, &via_bmdma_ops);
      pci_register_bar(dev, 4, PCI_BASE_ADDRESS_SPACE_IO, &d->bmdma_bar);
qdev_init_gpio_in(ds, via_ide_set_irq, ARRAY_SIZE(d->bus));

Nice! In actual fact, with some more refactoring of the CMD646 device I believe you could remove the per-implementation ops and move everything into hw/ide/pci.c.

The main reason this is a bit difficult now is because of the "Device specific" registers intertwined with the BMDMA registers, but there's no reason that CMD646 couldn't manually attach a fallback MemoryRegion to PCIIDEState::bmdma_bar and implement its device-specific registers there.

Unfortunately this isn't just a cut/paste job because there is also some mirroring of the BMDMA in PCI configuration space which will need some extra untangling: let's leave this as-is for now since it makes it easier for a follow-up patch to improve this later. On that basis:

Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>


ATB,

Mark.



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