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v2 3/4] hw/sd/sdhci: Read ADMA2_64 descriptor with a single dma_memory_read() Date: Wed, 31 Jul 2024 23:25:00 +0200 Message-ID: <20240731212501.44385-4-philmd@linaro.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240731212501.44385-1-philmd@linaro.org> References: <20240731212501.44385-1-philmd@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::331; envelope-from=philmd@linaro.org; helo=mail-wm1-x331.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@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-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1722461186058116600 Instead of 3 consecutive dma_memory_read() calls, use a packed structure to read the descriptor in a single call. Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- hw/sd/sdhci.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-) diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c index 0a95f49b93..2d8fa3151a 100644 --- a/hw/sd/sdhci.c +++ b/hw/sd/sdhci.c @@ -740,16 +740,20 @@ static void get_adma_description(SDHCIState *s, ADMAD= escr *dscr) } case SDHC_CTRL_ADMA2_64: { - dma_memory_read(s->dma_as, entry_addr, &dscr->attr, 1, + struct { + uint8_t attr; + uint8_t pad; + uint16_t length; + uint64_t addr; + } QEMU_PACKED adma2; + QEMU_BUILD_BUG_ON(sizeof(adma2) !=3D 12); + + dma_memory_read(s->dma_as, entry_addr, &adma2, sizeof(adma2), MEMTXATTRS_UNSPECIFIED); - dma_memory_read(s->dma_as, entry_addr + 2, &dscr->length, 2, - MEMTXATTRS_UNSPECIFIED); - dscr->length =3D le16_to_cpu(dscr->length); - dma_memory_read(s->dma_as, entry_addr + 4, &dscr->addr, 8, - MEMTXATTRS_UNSPECIFIED); - dscr->addr =3D le64_to_cpu(dscr->addr); - dscr->attr &=3D (uint8_t) ~0xC0; - dscr->incr =3D 12; + dscr->length =3D le16_to_cpu(adma2.length); + dscr->addr =3D le64_to_cpu(adma2.addr); + dscr->attr =3D adma2.attr & (uint8_t) ~0xc0; + dscr->incr =3D sizeof(adma2); trace_adma_description("ADMA2_64", dscr); break; } --=20 2.45.2