linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Greentime Hu <greentime.hu@sifive.com>
To: greentime.hu@sifive.com, guoren@linux.alibaba.com,
	vincent.chen@sifive.com, paul.walmsley@sifive.com,
	palmerdabbelt@google.com, linux-riscv@lists.infradead.org,
	linux-kernel@vger.kernel.org, oleg@redhat.com
Subject: [RFC PATCH v4 07/13] riscv: Add has_vector/riscv_vsize to save vector features.
Date: Tue, 26 May 2020 15:02:36 +0800	[thread overview]
Message-ID: <e896db91e3303f64ac401021f848e536e9d42aaa.1590474856.git.greentime.hu@sifive.com> (raw)
In-Reply-To: <cover.1590474856.git.greentime.hu@sifive.com>

From: Guo Ren <guoren@linux.alibaba.com>

This patch is used to detect vector support status of CPU and use
riscv_vsize to save the size of all the vector registers. It assumes
all harts has the same capabilities in SMP system.

[greentime.hu@sifive.com: add support for dynamic vlen]
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
---
 arch/riscv/kernel/cpufeature.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index c8527d770c98..5a68a926da68 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -16,6 +16,10 @@ unsigned long elf_hwcap __read_mostly;
 #ifdef CONFIG_FPU
 bool has_fpu __read_mostly;
 #endif
+#ifdef CONFIG_VECTOR
+bool has_vector __read_mostly;
+unsigned long riscv_vsize __read_mostly;
+#endif
 
 void riscv_fill_hwcap(void)
 {
@@ -73,4 +77,11 @@ void riscv_fill_hwcap(void)
 	if (elf_hwcap & (COMPAT_HWCAP_ISA_F | COMPAT_HWCAP_ISA_D))
 		has_fpu = true;
 #endif
+
+#ifdef CONFIG_VECTOR
+	if (elf_hwcap & COMPAT_HWCAP_ISA_V) {
+		has_vector = true;
+		riscv_vsize = csr_read(CSR_VLENB) * 32;
+	}
+#endif
 }
-- 
2.26.2


  parent reply	other threads:[~2020-05-26  7:03 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-26  7:02 [RFC PATCH v4 00/13] riscv: Add vector ISA support Greentime Hu
2020-05-26  7:02 ` [RFC PATCH v4 01/13] ptrace: Use regset_size() for dynamic regset size Greentime Hu
2020-05-26 14:00   ` Oleg Nesterov
2020-05-27  6:34     ` Greentime Hu
2020-05-27 11:31       ` Oleg Nesterov
2020-05-26  7:02 ` [RFC PATCH v4 02/13] riscv: Separate patch for cflags and aflags Greentime Hu
2020-05-26  7:02 ` [RFC PATCH v4 03/13] riscv: Rename __switch_to_aux -> fpu Greentime Hu
2020-05-26  7:02 ` [RFC PATCH v4 04/13] riscv: Extending cpufeature.c to detect V-extension Greentime Hu
2020-05-26  7:02 ` [RFC PATCH v4 05/13] riscv: Add new csr defines related to vector extension Greentime Hu
2020-05-31  1:56   ` Guo Ren
2020-06-01  8:15     ` Greentime Hu
2020-06-01  8:59       ` Guo Ren
2020-06-01  9:03   ` Guo Ren
2020-05-26  7:02 ` [RFC PATCH v4 06/13] riscv: Add vector feature to compile Greentime Hu
2020-05-26  7:02 ` Greentime Hu [this message]
2020-05-31  0:58   ` [RFC PATCH v4 07/13] riscv: Add has_vector/riscv_vsize to save vector features Guo Ren
2020-06-01  8:07     ` Greentime Hu
2020-06-01  9:13   ` Guo Ren
2020-05-26  7:02 ` [RFC PATCH v4 08/13] riscv: Reset vector register Greentime Hu
2020-05-26  7:02 ` [RFC PATCH v4 09/13] riscv: Add vector struct and assembler definitions Greentime Hu
2020-06-01  9:12   ` Guo Ren
2020-05-26  7:02 ` [RFC PATCH v4 10/13] riscv: Add task switch support for vector Greentime Hu
2020-05-31 15:29   ` Guo Ren
2020-05-31 16:08   ` Guo Ren
2020-06-01  9:12   ` Guo Ren
2020-05-26  7:02 ` [RFC PATCH v4 11/13] riscv: Add ptrace vector support Greentime Hu
2020-06-01  9:14   ` Guo Ren
2020-05-26  7:02 ` [RFC PATCH v4 12/13] riscv: Add sigcontext save/restore for vector Greentime Hu
2020-05-31 15:28   ` Guo Ren
2020-06-01  9:13   ` Guo Ren
2020-05-26  7:02 ` [RFC PATCH v4 13/13] riscv: signal: Report signal frame size to userspace via auxv Greentime Hu
2020-05-31 15:52 ` [RFC PATCH v4 00/13] riscv: Add vector ISA support Guo Ren
2020-06-02  2:21   ` Greentime Hu
2020-06-02  3:08     ` Guo Ren

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=e896db91e3303f64ac401021f848e536e9d42aaa.1590474856.git.greentime.hu@sifive.com \
    --to=greentime.hu@sifive.com \
    --cc=guoren@linux.alibaba.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-riscv@lists.infradead.org \
    --cc=oleg@redhat.com \
    --cc=palmerdabbelt@google.com \
    --cc=paul.walmsley@sifive.com \
    --cc=vincent.chen@sifive.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).