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| From: | Daniel Henrique Barboza |
| Subject: | Re: [PATCH v2 3/6] hw/riscv: simplify riscv_compute_fdt_addr() |
| Date: | Thu, 19 Jan 2023 10:00:18 -0300 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.6.0 |
On 1/18/23 23:23, Alistair Francis wrote:
On Tue, Jan 17, 2023 at 3:34 AM Daniel Henrique Barboza <dbarboza@ventanamicro.com> wrote:All callers are using attributes from the MachineState object. Use a pointer to it instead of passing dram_size (which is always machine->ram_size) and fdt (always machine->fdt). Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> --- hw/riscv/boot.c | 6 +++--- hw/riscv/microchip_pfsoc.c | 4 ++-- hw/riscv/sifive_u.c | 4 ++-- hw/riscv/spike.c | 4 ++-- hw/riscv/virt.c | 3 +-- include/hw/riscv/boot.h | 2 +- 6 files changed, 11 insertions(+), 12 deletions(-) diff --git a/hw/riscv/boot.c b/hw/riscv/boot.c index b213a32157..508da3f5c7 100644 --- a/hw/riscv/boot.c +++ b/hw/riscv/boot.c @@ -255,11 +255,11 @@ void riscv_load_initrd(MachineState *machine, uint64_t kernel_entry) * * The FDT is fdt_packed() during the calculation. */ -uint32_t riscv_compute_fdt_addr(hwaddr dram_base, uint64_t mem_size, - void *fdt) +uint32_t riscv_compute_fdt_addr(MachineState *machine, hwaddr dram_base) { + void *fdt = machine->fdt; uint64_t temp; - hwaddr dram_end = dram_base + mem_size; + hwaddr dram_end = dram_base + machine->ram_size; int ret = fdt_pack(fdt); int fdtsize; diff --git a/hw/riscv/microchip_pfsoc.c b/hw/riscv/microchip_pfsoc.c index dcdbc2cac3..a53e48e996 100644 --- a/hw/riscv/microchip_pfsoc.c +++ b/hw/riscv/microchip_pfsoc.c @@ -641,8 +641,8 @@ static void microchip_icicle_kit_machine_init(MachineState *machine) } /* Compute the fdt load address in dram */ - fdt_load_addr = riscv_compute_fdt_addr(memmap[MICROCHIP_PFSOC_DRAM_LO].base, - machine->ram_size, machine->fdt); + fdt_load_addr = riscv_compute_fdt_addr(machine, + memmap[MICROCHIP_PFSOC_DRAM_LO].base);I don't think this is correct here. So, first up I understand we don't correctly handle this today, *but* I see this change as a step in the wrong direction. The problem here is that ram is split over two areas. So if machine->ram_size is larger then 0x40000000 it is going to overflow MICROCHIP_PFSOC_DRAM_LO and jump to MICROCHIP_PFSOC_DRAM_HI (0x1000000000).
Yeah .... I'll add a new helper just to handle the microchip_pfsoc case which seems to be the only RISC-V board that has sparse RAM.
So we really want something like this /* Compute the fdt load address in dram */ if (machine->ram_size > memmap[MICROCHIP_PFSOC_DRAM_LO].size) { fdt_load_addr = riscv_load_fdt(memmap[MICROCHIP_PFSOC_DRAM_HI].base, machine->ram_size - memmap[MICROCHIP_PFSOC_DRAM_LO].size, machine->fdt); } else { fdt_load_addr = riscv_load_fdt(memmap[MICROCHIP_PFSOC_DRAM_LO].base, machine->ram_size, machine->fdt); } to handle overflowing MICROCHIP_PFSOC_DRAM_LO. While this patch is going in the wrong direction and making that more difficult Alistairriscv_load_fdt(fdt_load_addr, machine->fdt); /* Load the reset vector */ diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c index 626d4dc2f3..ebfddf161d 100644 --- a/hw/riscv/sifive_u.c +++ b/hw/riscv/sifive_u.c @@ -616,8 +616,8 @@ static void sifive_u_machine_init(MachineState *machine) kernel_entry = 0; } - fdt_load_addr = riscv_compute_fdt_addr(memmap[SIFIVE_U_DEV_DRAM].base, - machine->ram_size, machine->fdt); + fdt_load_addr = riscv_compute_fdt_addr(machine, + memmap[SIFIVE_U_DEV_DRAM].base); riscv_load_fdt(fdt_load_addr, machine->fdt); if (!riscv_is_32bit(&s->soc.u_cpus)) { diff --git a/hw/riscv/spike.c b/hw/riscv/spike.c index 88b9fdfc36..afd581436b 100644 --- a/hw/riscv/spike.c +++ b/hw/riscv/spike.c @@ -324,8 +324,8 @@ static void spike_board_init(MachineState *machine) kernel_entry = 0; } - fdt_load_addr = riscv_compute_fdt_addr(memmap[SPIKE_DRAM].base, - machine->ram_size, machine->fdt); + fdt_load_addr = riscv_compute_fdt_addr(machine, + memmap[SPIKE_DRAM].base); riscv_load_fdt(fdt_load_addr, machine->fdt); /* load the reset vector */ diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c index 839dfaa125..cbba0b8930 100644 --- a/hw/riscv/virt.c +++ b/hw/riscv/virt.c @@ -1307,8 +1307,7 @@ static void virt_machine_done(Notifier *notifier, void *data) start_addr = virt_memmap[VIRT_FLASH].base; } - fdt_load_addr = riscv_compute_fdt_addr(memmap[VIRT_DRAM].base, - machine->ram_size, machine->fdt); + fdt_load_addr = riscv_compute_fdt_addr(machine, memmap[VIRT_DRAM].base); riscv_load_fdt(fdt_load_addr, machine->fdt); /* load the reset vector */ diff --git a/include/hw/riscv/boot.h b/include/hw/riscv/boot.h index 9aea7b9c46..f933de88fb 100644 --- a/include/hw/riscv/boot.h +++ b/include/hw/riscv/boot.h @@ -47,7 +47,7 @@ target_ulong riscv_load_kernel(MachineState *machine, target_ulong firmware_end_addr, symbol_fn_t sym_cb); void riscv_load_initrd(MachineState *machine, uint64_t kernel_entry); -uint32_t riscv_compute_fdt_addr(hwaddr dram_start, uint64_t dram_size, void *fdt); +uint32_t riscv_compute_fdt_addr(MachineState *machine, hwaddr dram_start); void riscv_load_fdt(uint32_t fdt_addr, void *fdt); void riscv_setup_rom_reset_vec(MachineState *machine, RISCVHartArrayState *harts, hwaddr saddr, -- 2.39.0
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