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Wed, 19 Apr 2023 15:19:14 -0700 (PDT) Received: from atishp.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id jn11-20020a170903050b00b00196807b5189sm11619190plb.292.2023.04.19.15.19.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Apr 2023 15:19:13 -0700 (PDT) From: Atish Patra To: linux-kernel@vger.kernel.org Cc: Rajnesh Kanwal , Atish Patra , Alexandre Ghiti , Andrew Jones , Andrew Morton , Anup Patel , Atish Patra , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , Suzuki K Poulose , Will Deacon , Marc Zyngier , Sean Christopherson , linux-coco@lists.linux.dev, Dylan Reid , abrestic@rivosinc.com, Samuel Ortiz , Christoph Hellwig , Conor Dooley , Greg Kroah-Hartman , Guo Ren , Heiko Stuebner , Jiri Slaby , kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, Mayuresh Chitale , Palmer Dabbelt , Paolo Bonzini , Paul Walmsley , Uladzislau Rezki Subject: [RFC 47/48] RISC-V: Add shared bounce buffer to support DBCN for CoVE Guest. Date: Wed, 19 Apr 2023 15:17:15 -0700 Message-Id: <20230419221716.3603068-48-atishp@rivosinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230419221716.3603068-1-atishp@rivosinc.com> References: <20230419221716.3603068-1-atishp@rivosinc.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 32EF8180020 X-Rspamd-Server: rspam01 X-Stat-Signature: 9ftsqo7jar3gm3xdf3338nwtj8b1ejmx X-HE-Tag: 1681942754-333792 X-HE-Meta: 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 7PQyYCR+ 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Rajnesh Kanwal Early console buffer needs to be shared with the host for CoVE Guest. Signed-off-by: Rajnesh Kanwal Signed-off-by: Atish Patra --- drivers/tty/serial/earlycon-riscv-sbi.c | 51 ++++++++++++++++++++++++- 1 file changed, 49 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/earlycon-riscv-sbi.c b/drivers/tty/serial/earlycon-riscv-sbi.c index 311a4f8..9033cca 100644 --- a/drivers/tty/serial/earlycon-riscv-sbi.c +++ b/drivers/tty/serial/earlycon-riscv-sbi.c @@ -9,6 +9,14 @@ #include #include #include +#include +#include +#include + +#ifdef CONFIG_RISCV_COVE_GUEST +#define DBCN_BOUNCE_BUF_SIZE (PAGE_SIZE) +static char dbcn_buf[DBCN_BOUNCE_BUF_SIZE] __aligned(PAGE_SIZE); +#endif #ifdef CONFIG_RISCV_SBI_V01 static void sbi_putc(struct uart_port *port, unsigned char c) @@ -24,6 +32,33 @@ static void sbi_0_1_console_write(struct console *con, } #endif +#ifdef CONFIG_RISCV_COVE_GUEST +static void sbi_dbcn_console_write_cove(struct console *con, const char *s, + unsigned int n) +{ + phys_addr_t pa = __pa(dbcn_buf); + unsigned int off = 0; + + while (off < n) { + const unsigned int rem = n - off; + const unsigned int size = + rem > DBCN_BOUNCE_BUF_SIZE ? DBCN_BOUNCE_BUF_SIZE : rem; + + memcpy(dbcn_buf, &s[off], size); + + sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE, +#ifdef CONFIG_32BIT + size, pa, (u64)pa >> 32, +#else + size, pa, 0, +#endif + 0, 0, 0); + + off += size; + } +} +#endif + static void sbi_dbcn_console_write(struct console *con, const char *s, unsigned n) { @@ -45,14 +80,26 @@ static int __init early_sbi_setup(struct earlycon_device *device, /* TODO: Check for SBI debug console (DBCN) extension */ if ((sbi_spec_version >= sbi_mk_version(1, 0)) && - (sbi_probe_extension(SBI_EXT_DBCN) > 0)) + (sbi_probe_extension(SBI_EXT_DBCN) > 0)) { +#ifdef CONFIG_RISCV_COVE_GUEST + if (is_cove_guest()) { + ret = sbi_covg_share_memory(__pa(dbcn_buf), + DBCN_BOUNCE_BUF_SIZE); + if (ret) + return ret; + + device->con->write = sbi_dbcn_console_write_cove; + return 0; + } +#endif device->con->write = sbi_dbcn_console_write; - else + } else { #ifdef CONFIG_RISCV_SBI_V01 device->con->write = sbi_0_1_console_write; #else ret = -ENODEV; #endif + } return ret; } -- 2.25.1