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Re: [PATCH 04/20] ppc4xx: Use Ppc4xxSdramBank in ppc4xx_sdram_banks()

From: BALATON Zoltan
Subject: Re: [PATCH 04/20] ppc4xx: Use Ppc4xxSdramBank in ppc4xx_sdram_banks()
Date: Fri, 9 Sep 2022 21:32:17 +0200 (CEST) 
On Fri, 2 Sep 2022, BALATON Zoltan wrote:

On Fri, 2 Sep 2022, Cédric Le Goater wrote:

On 8/19/22 18:55, BALATON Zoltan wrote:

Change ppc4xx_sdram_banks() to take one Ppc4xxSdramBank array instead
of the separate arrays and adjust ppc4xx_sdram_init() and
ppc440_sdram_init() accordingly as well as machines using these.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
---
  hw/ppc/ppc405.h         |  4 +---
  hw/ppc/ppc405_uc.c      | 10 +++++-----
  hw/ppc/ppc440.h         |  5 ++---
  hw/ppc/ppc440_bamboo.c  | 15 ++++++---------
  hw/ppc/ppc440_uc.c      |  9 ++++-----
  hw/ppc/ppc4xx_devs.c    | 21 +++++++++------------
  hw/ppc/sam460ex.c       | 15 +++++----------
  include/hw/ppc/ppc4xx.h |  9 +++------
  8 files changed, 35 insertions(+), 53 deletions(-)

diff --git a/hw/ppc/ppc405.h b/hw/ppc/ppc405.h
index 756865621b..ca0972b88b 100644
--- a/hw/ppc/ppc405.h
+++ b/hw/ppc/ppc405.h
@@ -167,9 +167,7 @@ struct Ppc405SoCState {
      DeviceState parent_obj;
        /* Public */
-    MemoryRegion ram_banks[2];
-    hwaddr ram_bases[2], ram_sizes[2];
-
+    Ppc4xxSdramBank ram_banks[2];
      MemoryRegion *dram_mr;
      hwaddr ram_size;
  diff --git a/hw/ppc/ppc405_uc.c b/hw/ppc/ppc405_uc.c
index 2833d0d538..461d18c8a5 100644
--- a/hw/ppc/ppc405_uc.c
+++ b/hw/ppc/ppc405_uc.c
@@ -1071,14 +1071,14 @@ static void ppc405_soc_realize(DeviceState *dev, Error **errp) 
        /* SDRAM controller */
          /* XXX 405EP has no ECC interrupt */
-    s->ram_bases[0] = 0;
-    s->ram_sizes[0] = s->ram_size;
-    memory_region_init_alias(&s->ram_banks[0], OBJECT(s),
+    s->ram_banks[0].base = 0;
+    s->ram_banks[0].size = s->ram_size;
+    memory_region_init_alias(&s->ram_banks[0].ram, OBJECT(s),
                               "ppc405.sdram0", s->dram_mr,
-                             s->ram_bases[0], s->ram_sizes[0]);
+                             s->ram_banks[0].base, s->ram_banks[0].size);
        ppc4xx_sdram_init(env, qdev_get_gpio_in(DEVICE(&s->uic), 17), 1,
-                      s->ram_banks, s->ram_bases, s->ram_sizes);
+                      s->ram_banks);


Compile fails later on :

../hw/ppc/ppc405_uc.c: In function ‘ppc405_soc_realize’:
../hw/ppc/ppc405_uc.c:1083:5: error: ‘ppc4xx_sdram_init’ accessing 576 bytes in a region of size 272 [-Werror=stringop-overflow=] 
1083 |     ppc4xx_sdram_init(env, qdev_get_gpio_in(DEVICE(&s->uic), 17), 1,
     |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1084 |                       s->ram_banks);
     |                       ~~~~~~~~~~~~~
../hw/ppc/ppc405_uc.c:1083:5: note: referencing argument 4 of type ‘Ppc4xxSdramBank[0]’
I don't understand this error. The 576 bytes seems to be sizeof(Ppc4xxSdramBank) and 272 is sizeof(MemoryRegion) but I don't see what the compiler means here or how this could be avoided. Also my compiler doesn't warn for this so I can't check any alternative solutions. Any ideas?
It would be good to know if this is a compilet bug or a valid error before I try to change it. We have a MemoryRegion within Ppc4xxSdramBank not the other way around which the error seems to say. I'm still lost why we got this error with your compiler version.
Also this part is removed again two patches later so the best I could do is maybe try rearranging it to swap these patches but if there's a simpler way I'd go for that instead.
I've also sent a few questions replying to your review. I waited for a reply for those before preparing a v2. Could you have a look please? It's not urgent but I've already forgot some of the details so it will be more difficult to redo this later. Just changing the patch order to avoid this error would be a bigger task so it there's some other way I'd choose that. 

Regards,
BALATON Zoltan



I am using :

 gcc version 12.2.1 20220819 (Red Hat 12.2.1-1) (GCC)

Thanks,

C.




        /* External bus controller */
if (!ppc4xx_dcr_realize(PPC4xx_DCR_DEVICE(&s->ebc), &s->cpu, errp)) { 
diff --git a/hw/ppc/ppc440.h b/hw/ppc/ppc440.h
index 7cef936125..5eb2f9a6b3 100644
--- a/hw/ppc/ppc440.h
+++ b/hw/ppc/ppc440.h
@@ -11,14 +11,13 @@
  #ifndef PPC440_H
  #define PPC440_H
  -#include "hw/ppc/ppc.h"
+#include "hw/ppc/ppc4xx.h"
    void ppc4xx_l2sram_init(CPUPPCState *env);
  void ppc4xx_cpr_init(CPUPPCState *env);
  void ppc4xx_sdr_init(CPUPPCState *env);
  void ppc440_sdram_init(CPUPPCState *env, int nbanks,
-                       MemoryRegion *ram_memories,
-                       hwaddr *ram_bases, hwaddr *ram_sizes,
+                       Ppc4xxSdramBank ram_banks[],
                         int do_init);
  void ppc4xx_ahb_init(CPUPPCState *env);
  void ppc4xx_dma_init(CPUPPCState *env, int dcr_base);
diff --git a/hw/ppc/ppc440_bamboo.c b/hw/ppc/ppc440_bamboo.c
index e3412c4fcd..2aac8a3fe9 100644
--- a/hw/ppc/ppc440_bamboo.c
+++ b/hw/ppc/ppc440_bamboo.c
@@ -168,9 +168,8 @@ static void bamboo_init(MachineState *machine)
      unsigned int pci_irq_nrs[4] = { 28, 27, 26, 25 };
      MemoryRegion *address_space_mem = get_system_memory();
      MemoryRegion *isa = g_new(MemoryRegion, 1);
- MemoryRegion *ram_memories = g_new(MemoryRegion, PPC440EP_SDRAM_NR_BANKS); 
-    hwaddr ram_bases[PPC440EP_SDRAM_NR_BANKS] = {0};
-    hwaddr ram_sizes[PPC440EP_SDRAM_NR_BANKS] = {0};
+    Ppc4xxSdramBank *ram_banks = g_new0(Ppc4xxSdramBank,
+                                        PPC440EP_SDRAM_NR_BANKS);
      PCIBus *pcibus;
      PowerPCCPU *cpu;
      CPUPPCState *env;
@@ -205,13 +204,11 @@ static void bamboo_init(MachineState *machine)
qdev_get_gpio_in(DEVICE(cpu), PPC40x_INPUT_CINT)); 
        /* SDRAM controller */
- ppc4xx_sdram_banks(machine->ram, PPC440EP_SDRAM_NR_BANKS, ram_memories, 
-                       ram_bases, ram_sizes, ppc440ep_sdram_bank_sizes);
+    ppc4xx_sdram_banks(machine->ram, PPC440EP_SDRAM_NR_BANKS, ram_banks,
+                       ppc440ep_sdram_bank_sizes);
/* XXX 440EP's ECC interrupts are on UIC1, but we've only created UIC0. */ 
-    ppc4xx_sdram_init(env,
-                      qdev_get_gpio_in(uicdev, 14),
-                      PPC440EP_SDRAM_NR_BANKS, ram_memories,
-                      ram_bases, ram_sizes);
+    ppc4xx_sdram_init(env, qdev_get_gpio_in(uicdev, 14),
+                      PPC440EP_SDRAM_NR_BANKS, ram_banks);
/* Enable SDRAM memory regions, this should be done by the firmware */ 
      if (ppc_dcr_write(env->dcr_env, SDRAM0_CFGADDR, 0x20) ||
          ppc_dcr_write(env->dcr_env, SDRAM0_CFGDATA, 0x80000000)) {
diff --git a/hw/ppc/ppc440_uc.c b/hw/ppc/ppc440_uc.c
index 6ab0ad7985..3507c35b63 100644
--- a/hw/ppc/ppc440_uc.c
+++ b/hw/ppc/ppc440_uc.c
@@ -690,8 +690,7 @@ static void sdram_reset(void *opaque)
  }
    void ppc440_sdram_init(CPUPPCState *env, int nbanks,
-                       MemoryRegion *ram_memories,
-                       hwaddr *ram_bases, hwaddr *ram_sizes,
+                       Ppc4xxSdramBank ram_banks[],
                         int do_init)
  {
      ppc440_sdram_t *sdram;
@@ -700,9 +699,9 @@ void ppc440_sdram_init(CPUPPCState *env, int nbanks,
      sdram = g_malloc0(sizeof(*sdram));
      sdram->nbanks = nbanks;
      for (i = 0; i < nbanks; i++) {
-        sdram->bank[i].ram = ram_memories[i];
-        sdram->bank[i].base = ram_bases[i];
-        sdram->bank[i].size = ram_sizes[i];
+        sdram->bank[i].ram = ram_banks[i].ram;
+        sdram->bank[i].base = ram_banks[i].base;
+        sdram->bank[i].size = ram_banks[i].size;
      }
      qemu_register_reset(&sdram_reset, sdram);
      ppc_dcr_register(env, SDRAM0_CFGADDR,
diff --git a/hw/ppc/ppc4xx_devs.c b/hw/ppc/ppc4xx_devs.c
index 936d6f77fe..e0b5931c04 100644
--- a/hw/ppc/ppc4xx_devs.c
+++ b/hw/ppc/ppc4xx_devs.c
@@ -343,9 +343,7 @@ static void sdram_reset(void *opaque)
  }
    void ppc4xx_sdram_init(CPUPPCState *env, qemu_irq irq, int nbanks,
-                       MemoryRegion *ram_memories,
-                       hwaddr *ram_bases,
-                       hwaddr *ram_sizes)
+                       Ppc4xxSdramBank ram_banks[])
  {
      ppc4xx_sdram_t *sdram;
      int i;
@@ -354,9 +352,9 @@ void ppc4xx_sdram_init(CPUPPCState *env, qemu_irq irq, int nbanks, 
      sdram->irq = irq;
      sdram->nbanks = nbanks;
      for (i = 0; i < nbanks; i++) {
-        sdram->bank[i].ram = ram_memories[i];
-        sdram->bank[i].base = ram_bases[i];
-        sdram->bank[i].size = ram_sizes[i];
+        sdram->bank[i].ram = ram_banks[i].ram;
+        sdram->bank[i].base = ram_banks[i].base;
+        sdram->bank[i].size = ram_banks[i].size;
      }
      qemu_register_reset(&sdram_reset, sdram);
      ppc_dcr_register(env, SDRAM0_CFGADDR,
@@ -376,8 +374,7 @@ void ppc4xx_sdram_init(CPUPPCState *env, qemu_irq irq, int nbanks, 
   * sizes varies by SoC.
   */
  void ppc4xx_sdram_banks(MemoryRegion *ram, int nr_banks,
-                        MemoryRegion ram_memories[],
-                        hwaddr ram_bases[], hwaddr ram_sizes[],
+                        Ppc4xxSdramBank ram_banks[],
                          const ram_addr_t sdram_bank_sizes[])
  {
      ram_addr_t size_left = memory_region_size(ram);
@@ -392,13 +389,13 @@ void ppc4xx_sdram_banks(MemoryRegion *ram, int nr_banks, 
              if (bank_size <= size_left) {
                  char name[32];
  -                ram_bases[i] = base;
-                ram_sizes[i] = bank_size;
+                ram_banks[i].base = base;
+                ram_banks[i].size = bank_size;
                  base += bank_size;
                  size_left -= bank_size;
                  snprintf(name, sizeof(name), "ppc4xx.sdram%d", i);
- memory_region_init_alias(&ram_memories[i], NULL, name, ram, 
-                                         ram_bases[i], ram_sizes[i]);
+ memory_region_init_alias(&ram_banks[i].ram, NULL, name, ram, + ram_banks[i].base, ram_banks[i].size); 
                  break;
              }
          }
diff --git a/hw/ppc/sam460ex.c b/hw/ppc/sam460ex.c
index 850bb3b817..f4c2a693fb 100644
--- a/hw/ppc/sam460ex.c
+++ b/hw/ppc/sam460ex.c
@@ -73,7 +73,6 @@
  #define OPB_FREQ 115000000
  #define EBC_FREQ 115000000
  #define UART_FREQ 11059200
-#define SDRAM_NR_BANKS 4
/* The SoC could also handle 4 GiB but firmware does not work with that. */ 
  /* Maybe it overflows a signed 32 bit number somewhere? */
@@ -274,9 +273,7 @@ static void sam460ex_init(MachineState *machine)
  {
      MemoryRegion *address_space_mem = get_system_memory();
      MemoryRegion *isa = g_new(MemoryRegion, 1);
-    MemoryRegion *ram_memories = g_new(MemoryRegion, SDRAM_NR_BANKS);
-    hwaddr ram_bases[SDRAM_NR_BANKS] = {0};
-    hwaddr ram_sizes[SDRAM_NR_BANKS] = {0};
+    Ppc4xxSdramBank *ram_banks = g_new0(Ppc4xxSdramBank, 1);
      MemoryRegion *l2cache_ram = g_new(MemoryRegion, 1);
      DeviceState *uic[4];
      int i;
@@ -345,20 +342,18 @@ static void sam460ex_init(MachineState *machine)
      /* SDRAM controller */
      /* put all RAM on first bank because board has one slot
       * and firmware only checks that */
- ppc4xx_sdram_banks(machine->ram, 1, ram_memories, ram_bases, ram_sizes, 
-                       ppc460ex_sdram_bank_sizes);
+ ppc4xx_sdram_banks(machine->ram, 1, ram_banks, ppc460ex_sdram_bank_sizes); 
        /* FIXME: does 460EX have ECC interrupts? */
-    ppc440_sdram_init(env, SDRAM_NR_BANKS, ram_memories,
-                      ram_bases, ram_sizes, 1);
+    ppc440_sdram_init(env, 1, ram_banks, 1);
        /* IIC controllers and devices */
      dev = sysbus_create_simple(TYPE_PPC4xx_I2C, 0x4ef600700,
                                 qdev_get_gpio_in(uic[0], 2));
      i2c = PPC4xx_I2C(dev)->bus;
      /* SPD EEPROM on RAM module */
-    spd_data = spd_data_generate(ram_sizes[0] < 128 * MiB ? DDR : DDR2,
-                                 ram_sizes[0]);
+ spd_data = spd_data_generate(ram_banks->size < 128 * MiB ? DDR : DDR2, 
+                                 ram_banks->size);
      spd_data[20] = 4; /* SO-DIMM module */
      smbus_eeprom_init_one(i2c, 0x50, spd_data);
      /* RTC */
diff --git a/include/hw/ppc/ppc4xx.h b/include/hw/ppc/ppc4xx.h
index a5e6c185af..0a9781bfaf 100644
--- a/include/hw/ppc/ppc4xx.h
+++ b/include/hw/ppc/ppc4xx.h
@@ -43,14 +43,11 @@ enum {
  };
    void ppc4xx_sdram_banks(MemoryRegion *ram, int nr_banks,
-                        MemoryRegion ram_memories[],
-                        hwaddr ram_bases[], hwaddr ram_sizes[],
+                        Ppc4xxSdramBank ram_banks[],
                          const ram_addr_t sdram_bank_sizes[]);
  -void ppc4xx_sdram_init (CPUPPCState *env, qemu_irq irq, int nbanks,
-                        MemoryRegion ram_memories[],
-                        hwaddr *ram_bases,
-                        hwaddr *ram_sizes);
+void ppc4xx_sdram_init(CPUPPCState *env, qemu_irq irq, int nbanks,
+                       Ppc4xxSdramBank ram_banks[]);
    #define TYPE_PPC4xx_PCI_HOST_BRIDGE "ppc4xx-pcihost"
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