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Wed, 29 May 2024 04:48:16 -0400 Received: from mail.ozlabs.org (mail.ozlabs.org [IPv6:2404:9400:2221:ea00::3]) by gandalf.ozlabs.org (Postfix) with ESMTP id 4Vq31g5Rkwz4x1s; Wed, 29 May 2024 18:48:07 +1000 (AEST) Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 4Vq31Y2Djdz4wyh; Wed, 29 May 2024 18:48:00 +1000 (AEST) Message-ID: <60541d4f-5829-495c-86fb-4fbf82cf98c8@kaod.org> Date: Wed, 29 May 2024 10:47:57 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 14/16] aspeed/soc: fix incorrect dram size for AST2700 To: Jamin Lin , Peter Maydell , Andrew Jeffery , Joel Stanley , Alistair Francis , Cleber Rosa , =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= , Wainer dos Santos Moschetta , Beraldo Leal , "open list:ASPEED BMCs" , "open list:All patches CC here" Cc: troy_lee@aspeedtech.com, yunlin.tang@aspeedtech.com References: <20240527080231.1576609-1-jamin_lin@aspeedtech.com> <20240527080231.1576609-15-jamin_lin@aspeedtech.com> Content-Language: en-US, fr From: =?UTF-8?Q?C=C3=A9dric_Le_Goater?= In-Reply-To: <20240527080231.1576609-15-jamin_lin@aspeedtech.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=150.107.74.76; envelope-from=SRS0=oWzJ=NA=kaod.org=clg@ozlabs.org; helo=mail.ozlabs.org X-Spam_score_int: -39 X-Spam_score: -4.0 X-Spam_bar: ---- X-Spam_report: (-4.0 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org X-TUID: Dwma5CIEfDJz Hello Jamin On 5/27/24 10:02, Jamin Lin wrote: > AST2700 dram size calculation is not back compatible AST2600. > According to the DDR capacity hardware behavior, > if users write the data to address which is beyond the ram size, > it would write the data to address 0. > For example: > a. sdram base address "0x4 00000000" > b. sdram size is 1 GiB > The available address range is from "0x4 00000000" to "0x4 40000000". > If users write 0xdeadbeef to address "0x6 00000000", > the value of DRAM address 0 (base address 0x4 00000000) should be 0xdeadbeef. > > Add aspeed_soc_ast2700_dram_init to calculate the dram size and add > memory I/O whose address range is from max_ram_size - ram_size to max_ram_size > and its read/write handler to emulate DDR capacity hardware behavior. > > Signed-off-by: Troy Lee > Signed-off-by: Jamin Lin > --- > hw/arm/aspeed_ast27x0.c | 94 ++++++++++++++++++++++++++++++++++++- > include/hw/arm/aspeed_soc.h | 1 + > 2 files changed, 94 insertions(+), 1 deletion(-) > > diff --git a/hw/arm/aspeed_ast27x0.c b/hw/arm/aspeed_ast27x0.c > index a3a03fc1ca..19380087fa 100644 > --- a/hw/arm/aspeed_ast27x0.c > +++ b/hw/arm/aspeed_ast27x0.c > @@ -20,6 +20,7 @@ > #include "sysemu/sysemu.h" > #include "hw/intc/arm_gicv3.h" > #include "qapi/qmp/qlist.h" > +#include "qemu/log.h" > > static const hwaddr aspeed_soc_ast2700_memmap[] = { > [ASPEED_DEV_SPI_BOOT] = 0x400000000, > @@ -191,6 +192,97 @@ static qemu_irq aspeed_soc_ast2700_get_irq(AspeedSoCState *s, int dev) > return qdev_get_gpio_in(a->intc.gic, sc->irqmap[dev]); > } > > +static uint64_t aspeed_ram_capacity_read(void *opaque, hwaddr addr, > + unsigned int size) > +{ > + qemu_log_mask(LOG_GUEST_ERROR, > + "%s: read @%" PRIx64 " out of ram size\n", > + __func__, addr); > + return 0; > +} > + > +static void aspeed_ram_capacity_write(void *opaque, hwaddr addr, uint64_t data, > + unsigned int size) > +{ > + AspeedSoCState *s = ASPEED_SOC(opaque); > + uint32_t test_pattern = 0xdeadbeef; > + bool invalid_pattern = true; > + uint32_t *ram_ptr; > + int sz; > + > + ram_ptr = memory_region_get_ram_ptr(s->dram_mr); > + > + /* > + * Emulate ddr capacity hardware behavior. > + * If writes the test_pattern to address which is beyond the ram size, > + * it would write the test_pattern to address 0. > + */ > + for (sz = 4; sz > 0 ; sz--) { > + test_pattern = (test_pattern << 4) + sz; > + if (data == test_pattern) { > + ram_ptr[0] = test_pattern; > + invalid_pattern = false; > + break; > + } > + } > + > + if (invalid_pattern) { > + qemu_log_mask(LOG_GUEST_ERROR, > + "%s: write invalid pattern @%" PRIx64 > + " to addr @%" HWADDR_PRIx "]\n", > + __func__, data, addr); > + } > +} I would simplify with write transaction on the DRAM memory region of the SoC. For that, initialize a 'dram_as' on top of 'dram_mr' in aspeed_soc_ast2700_dram_init(): address_space_init(&s->dram_as, s->dram_mr, "dram"); Then, in aspeed_ram_capacity_write(), add : address_space_write(&s->dram_as, addr % ram_size, MEMTXATTRS_UNSPECIFIED, &data, size); and check returned error. It should be enough to detect the RAM size from FW. Thanks, C. > +static const MemoryRegionOps aspeed_ram_capacity_ops = { > + .read = aspeed_ram_capacity_read, > + .write = aspeed_ram_capacity_write, > + .endianness = DEVICE_LITTLE_ENDIAN, > + .valid = { > + .min_access_size = 1, > + .max_access_size = 8, > + }, > +}; > + > +/* > + * SDMC should be realized first to get correct RAM size and max size > + * values > + */ > +static bool aspeed_soc_ast2700_dram_init(DeviceState *dev, Error **errp) > +{ > + ram_addr_t ram_size, max_ram_size; > + Aspeed27x0SoCState *a = ASPEED27X0_SOC(dev); > + AspeedSoCState *s = ASPEED_SOC(dev); > + AspeedSoCClass *sc = ASPEED_SOC_GET_CLASS(s); > + > + ram_size = object_property_get_uint(OBJECT(&s->sdmc), "ram-size", > + &error_abort); > + max_ram_size = object_property_get_uint(OBJECT(&s->sdmc), "max-ram-size", > + &error_abort); > + > + memory_region_init(&s->dram_container, OBJECT(s), "ram-container", > + ram_size); > + memory_region_add_subregion(&s->dram_container, 0, s->dram_mr); > + > + /* > + * Add a memory region beyond the RAM region to emulate > + * ddr capacity hardware behavior. > + */ > + if (ram_size < max_ram_size) { > + memory_region_init_io(&a->dram_empty, OBJECT(s), > + &aspeed_ram_capacity_ops, s, > + "ram-empty", max_ram_size - ram_size); > + > + memory_region_add_subregion(s->memory, > + sc->memmap[ASPEED_DEV_SDRAM] + ram_size, > + &a->dram_empty); > + } > + > + memory_region_add_subregion(s->memory, > + sc->memmap[ASPEED_DEV_SDRAM], &s->dram_container); > + return true; > +} > + > static void aspeed_soc_ast2700_init(Object *obj) > { > Aspeed27x0SoCState *a = ASPEED27X0_SOC(obj); > @@ -461,7 +553,7 @@ static void aspeed_soc_ast2700_realize(DeviceState *dev, Error **errp) > sc->memmap[ASPEED_DEV_SDMC]); > > /* RAM */ > - if (!aspeed_soc_dram_init(s, errp)) { > + if (!aspeed_soc_ast2700_dram_init(dev, errp)) { > return; > } > > diff --git a/include/hw/arm/aspeed_soc.h b/include/hw/arm/aspeed_soc.h > index 9f177b6037..9dbf48f873 100644 > --- a/include/hw/arm/aspeed_soc.h > +++ b/include/hw/arm/aspeed_soc.h > @@ -127,6 +127,7 @@ struct Aspeed27x0SoCState { > > ARMCPU cpu[ASPEED_CPUS_NUM]; > AspeedINTCState intc; > + MemoryRegion dram_empty; > }; > > #define TYPE_ASPEED27X0_SOC "aspeed27x0-soc"