From: Dave Jiang <dave.jiang@intel.com>
To: vkoul@kernel.org, tglx@linutronix.de, mingo@redhat.com,
bp@alien8.de, hpa@zytor.com, bhelgaas@google.com,
gregkh@linuxfoundation.org, arnd@arndb.de
Cc: dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org,
x86@kernel.org, dan.j.williams@intel.com, ashok.raj@intel.com,
fenghua.yu@intel.com, tony.luck@intel.com, jing.lin@intel.com,
sanjay.k.kumar@intel.com, dave.hansen@intel.com
Subject: [PATCH v2 2/9] x86/asm: move the raw asm in iosubmit_cmds512() to special_insns.h
Date: Mon, 18 May 2020 11:53:33 -0700 [thread overview]
Message-ID: <158982801306.37989.17977882738076524234.stgit@djiang5-desk3.ch.intel.com> (raw)
In-Reply-To: <158982749959.37989.2096629611303670415.stgit@djiang5-desk3.ch.intel.com>
The MOVDIR64B instruction can be used by other wrapper instructions. Move
the core asm code to special_insns.h and have iosubmit_cmds512() call the
core asm function.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
---
arch/x86/include/asm/io.h | 15 ++-------------
arch/x86/include/asm/special_insns.h | 17 +++++++++++++++++
2 files changed, 19 insertions(+), 13 deletions(-)
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index e1aa17a468a8..56421666115e 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -412,25 +412,14 @@ extern bool phys_mem_access_encrypted(unsigned long phys_addr,
* Warning: Do not use this helper unless your driver has checked that the CPU
* instruction is supported on the platform.
*/
-static inline void iosubmit_cmds512(void __iomem *__dst, const void *src,
+static inline void iosubmit_cmds512(void __iomem *dst, const void *src,
size_t count)
{
- /*
- * Note that this isn't an "on-stack copy", just definition of "dst"
- * as a pointer to 64-bytes of stuff that is going to be overwritten.
- * In the MOVDIR64B case that may be needed as you can use the
- * MOVDIR64B instruction to copy arbitrary memory around. This trick
- * lets the compiler know how much gets clobbered.
- */
- volatile struct { char _[64]; } *dst = __dst;
const u8 *from = src;
const u8 *end = from + count * 64;
while (from < end) {
- /* MOVDIR64B [rdx], rax */
- asm volatile(".byte 0x66, 0x0f, 0x38, 0xf8, 0x02"
- : "=m" (dst)
- : "d" (from), "a" (dst));
+ movdir64b(dst, from);
from += 64;
}
}
diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
index 1b9b2e79c353..9ad28d82de70 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -256,6 +256,23 @@ static inline int write_user_shstk_64(unsigned long addr, unsigned long val)
#define nop() asm volatile ("nop")
+static inline void movdir64b(void *__dst, const void *src)
+{
+ /*
+ * Note that this isn't an "on-stack copy", just definition of "dst"
+ * as a pointer to 64-bytes of stuff that is going to be overwritten.
+ * In the MOVDIR64B case that may be needed as you can use the
+ * MOVDIR64B instruction to copy arbitrary memory around. This trick
+ * lets the compiler know how much gets clobbered.
+ */
+ volatile struct { char _[64]; } *dst = __dst;
+
+ /* MOVDIR64B [rdx], rax */
+ asm volatile(".byte 0x66, 0x0f, 0x38, 0xf8, 0x02"
+ : "=m" (dst)
+ : "d" (src), "a" (dst));
+}
+
#endif /* __KERNEL__ */
next prev parent reply other threads:[~2020-05-18 18:53 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-18 18:53 [PATCH v2 0/9] Add shared workqueue support for idxd driver Dave Jiang
2020-05-18 18:53 ` [PATCH v2 1/9] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions Dave Jiang
2020-05-18 18:53 ` Dave Jiang [this message]
2020-05-18 18:53 ` [PATCH v2 3/9] x86/asm: add enqcmds() to support ENQCMDS instruction Dave Jiang
2020-05-18 18:53 ` [PATCH v2 4/9] dmaengine: idxd: add work queue drain support Dave Jiang
2020-05-18 18:53 ` [PATCH v2 5/9] dmaengine: idxd: move submission to sbitmap_queue Dave Jiang
2020-05-18 18:53 ` [PATCH v2 6/9] dmaengine: idxd: add shared workqueue support Dave Jiang
2020-05-18 18:54 ` [PATCH v2 7/9] dmaengine: idxd: clean up descriptors with fault error Dave Jiang
2020-05-18 18:54 ` [PATCH v2 8/9] dmaengine: idxd: add leading / for sysfspath in ABI documentation Dave Jiang
2020-05-18 18:54 ` [PATCH v2 9/9] dmaengine: idxd: add ABI documentation for shared wq Dave Jiang
2020-06-01 22:09 ` [PATCH v2 0/9] Add shared workqueue support for idxd driver Dave Jiang
2020-06-03 6:33 ` Vinod Koul
2020-06-03 15:30 ` Dave Jiang
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=158982801306.37989.17977882738076524234.stgit@djiang5-desk3.ch.intel.com \
--to=dave.jiang@intel.com \
--cc=arnd@arndb.de \
--cc=ashok.raj@intel.com \
--cc=bhelgaas@google.com \
--cc=bp@alien8.de \
--cc=dan.j.williams@intel.com \
--cc=dave.hansen@intel.com \
--cc=dmaengine@vger.kernel.org \
--cc=fenghua.yu@intel.com \
--cc=gregkh@linuxfoundation.org \
--cc=hpa@zytor.com \
--cc=jing.lin@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=sanjay.k.kumar@intel.com \
--cc=tglx@linutronix.de \
--cc=tony.luck@intel.com \
--cc=vkoul@kernel.org \
--cc=x86@kernel.org \
/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).