public inbox for opensbi@lists.infradead.org
 help / color / mirror / Atom feed
From: cp0613@linux.alibaba.com
To: opensbi@lists.infradead.org
Cc: anup@brainfault.org, samuel.holland@sifive.com,
	guoren@kernel.org, Chen Pei <cp0613@linux.alibaba.com>
Subject: [PATCH v2 1/2] lib: sbi: Introduce sbi_hart_pmp_fence_vma
Date: Thu, 26 Feb 2026 20:34:07 +0800	[thread overview]
Message-ID: <20260226123408.1597-2-cp0613@linux.alibaba.com> (raw)
In-Reply-To: <20260226123408.1597-1-cp0613@linux.alibaba.com>

From: Chen Pei <cp0613@linux.alibaba.com>

The original sbi_hart_pmp_fence implementation actually flushes all address
translation cache entries. The sbi_hart_pmp_fence_vma is introduced to flush
only the entries corresponding to a given address and size.

Signed-off-by: Chen Pei <cp0613@linux.alibaba.com>
---
 include/sbi/sbi_hart_pmp.h       |  3 ++-
 lib/sbi/sbi_hart_pmp.c           | 30 +++++++++++++++++++++++++++---
 platform/generic/eswin/eic770x.c |  2 +-
 3 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/include/sbi/sbi_hart_pmp.h b/include/sbi/sbi_hart_pmp.h
index a7765d17..5d359764 100644
--- a/include/sbi/sbi_hart_pmp.h
+++ b/include/sbi/sbi_hart_pmp.h
@@ -15,7 +15,8 @@ unsigned int sbi_hart_pmp_count(struct sbi_scratch *scratch);
 unsigned int sbi_hart_pmp_log2gran(struct sbi_scratch *scratch);
 unsigned int sbi_hart_pmp_addrbits(struct sbi_scratch *scratch);
 bool sbi_hart_smepmp_is_fw_region(unsigned int pmp_idx);
-void sbi_hart_pmp_fence(void);
+void sbi_hart_pmp_fence_all(void);
+void sbi_hart_pmp_fence_vma(unsigned long start, unsigned long size);
 int sbi_hart_pmp_init(struct sbi_scratch *scratch);
 
 #endif
diff --git a/lib/sbi/sbi_hart_pmp.c b/lib/sbi/sbi_hart_pmp.c
index 02a3b3c4..80407110 100644
--- a/lib/sbi/sbi_hart_pmp.c
+++ b/lib/sbi/sbi_hart_pmp.c
@@ -62,7 +62,7 @@ bool sbi_hart_smepmp_is_fw_region(unsigned int pmp_idx)
 	return bitmap_test(fw_smepmp_ids, pmp_idx) ? true : false;
 }
 
-void sbi_hart_pmp_fence(void)
+void sbi_hart_pmp_fence_all(void)
 {
 	/*
 	 * As per section 3.7.2 of privileged specification v1.12,
@@ -86,6 +86,30 @@ void sbi_hart_pmp_fence(void)
 	}
 }
 
+void sbi_hart_pmp_fence_vma(unsigned long start, unsigned long size)
+{
+	if ((start == 0 && size == 0) || (size == SBI_TLB_FLUSH_ALL)) {
+		sbi_hart_pmp_fence_all();
+	} else {
+		/* Flush TLB entries for the specified address range */
+		if (misa_extension('S')) {
+			unsigned long i;
+			for (i = 0; i < size; i += PAGE_SIZE) {
+				__asm__ __volatile__("sfence.vma %0"
+							:
+							: "r"(start + i)
+							: "memory");
+			}
+
+			if (misa_extension('H')) {
+				for (i = 0; i < size; i += PAGE_SIZE) {
+					__sbi_hfence_gvma_gpa((start + i) >> 2);
+				}
+			}
+		}
+	}
+}
+
 static void sbi_hart_smepmp_set(struct sbi_scratch *scratch,
 				struct sbi_domain *dom,
 				struct sbi_domain_memregion *reg,
@@ -213,7 +237,7 @@ static int sbi_hart_smepmp_configure(struct sbi_scratch *scratch)
 	 * Keep the RLB bit so that dynamic mappings can be done.
 	 */
 
-	sbi_hart_pmp_fence();
+	sbi_hart_pmp_fence_all();
 	return 0;
 }
 
@@ -293,7 +317,7 @@ static int sbi_hart_oldpmp_configure(struct sbi_scratch *scratch)
 	for(; pmp_idx < pmp_count; pmp_idx++)
 		pmp_disable(pmp_idx);
 
-	sbi_hart_pmp_fence();
+	sbi_hart_pmp_fence_all();
 	return 0;
 }
 
diff --git a/platform/generic/eswin/eic770x.c b/platform/generic/eswin/eic770x.c
index 7330df9f..d5564d35 100644
--- a/platform/generic/eswin/eic770x.c
+++ b/platform/generic/eswin/eic770x.c
@@ -347,7 +347,7 @@ static int eswin_eic7700_pmp_configure(struct sbi_scratch *scratch)
 	while (pmp_idx < pmp_max)
 		pmp_disable(pmp_idx++);
 
-	sbi_hart_pmp_fence();
+	sbi_hart_pmp_fence_all();
 	return 0;
 no_more_pmp:
 	sbi_printf("%s: insufficient PMP entries\n", __func__);
-- 
2.50.1


-- 
opensbi mailing list
opensbi@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/opensbi

  reply	other threads:[~2026-02-26 12:35 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-02-26 12:34 [PATCH v2 0/2] lib: sbi: Flush cache entries after writing PMP CSRs cp0613
2026-02-26 12:34 ` cp0613 [this message]
2026-02-26 12:34 ` [PATCH v2 2/2] " cp0613
2026-02-27  1:19   ` Guo Ren
2026-02-27  1:21   ` 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=20260226123408.1597-2-cp0613@linux.alibaba.com \
    --to=cp0613@linux.alibaba.com \
    --cc=anup@brainfault.org \
    --cc=guoren@kernel.org \
    --cc=opensbi@lists.infradead.org \
    --cc=samuel.holland@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