From: Xin Wang <x.wang@intel.com>
To: igt-dev@lists.freedesktop.org
Cc: alex.zuo@intel.com, shuicheng.lin@intel.com,
stuart.summers@intel.com, kamil.konieczny@intel.com,
matthew.d.roper@intel.com, ravi.kumar.vodapalli@intel.com,
zbigniew.kempczynski@intel.com, Xin Wang <x.wang@intel.com>
Subject: [PATCH v9 2/5] include/linux_scaffold: add FIELD_GET() bitfield helper
Date: Wed, 31 Dec 2025 05:55:22 +0000 [thread overview]
Message-ID: <20251231055525.51524-3-x.wang@intel.com> (raw)
In-Reply-To: <20251231055525.51524-1-x.wang@intel.com>
Add __bf_shf() and FIELD_GET() so code can extract bitfields from
registers using a mask, matching the common Linux FIELD_GET()
semantics without pulling in kernel headers.
Signed-off-by: Xin Wang <x.wang@intel.com>
---
include/linux_scaffold.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/linux_scaffold.h b/include/linux_scaffold.h
index f6620ad0a..bd69c1ed2 100644
--- a/include/linux_scaffold.h
+++ b/include/linux_scaffold.h
@@ -51,4 +51,9 @@ static inline s64 sign_extend64(u64 value, int index)
#define BITS_PER_LONG BITS_PER_TYPE(long)
#define BITS_PER_LONG_LONG BITS_PER_TYPE(long long)
+#define __bf_shf(x) (__builtin_ffsll(x) - 1)
+
+#define FIELD_GET(mask, reg) \
+ (typeof(mask))(((reg) & (mask)) >> __bf_shf(mask))
+
#endif /* _INTEL_GPU_COMMANDS_SCAFFOLD_H_ */
--
2.43.0
next prev parent reply other threads:[~2025-12-31 5:55 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-31 5:55 [PATCH v9 0/5] tests/intel/xe_pat: add helper funtion to read PAT table Xin Wang
2025-12-31 5:55 ` [PATCH v9 1/5] lib/intel_pat: add pat_sw_config debugfs parser Xin Wang
2025-12-31 16:56 ` Matt Roper
2025-12-31 5:55 ` Xin Wang [this message]
2025-12-31 17:00 ` [PATCH v9 2/5] include/linux_scaffold: add FIELD_GET() bitfield helper Matt Roper
2025-12-31 5:55 ` [PATCH v9 3/5] tests/xe_pat: add pat-sanity subtest for debugfs vs getters Xin Wang
2025-12-31 17:11 ` Matt Roper
2025-12-31 5:55 ` [PATCH v9 4/5] tests/xe_pat: use debugfs reserved flags Xin Wang
2025-12-31 5:55 ` [PATCH v9 5/5] intel-ci: add xe_pat pat-sanity Xin Wang
2025-12-31 17:13 ` Matt Roper
2025-12-31 6:47 ` ✓ Xe.CI.BAT: success for tests/intel/xe_pat: add helper funtion to read PAT table Patchwork
2025-12-31 7:07 ` ✓ i915.CI.BAT: " Patchwork
2025-12-31 7:49 ` ✗ Xe.CI.Full: failure " Patchwork
2025-12-31 9:15 ` ✗ i915.CI.Full: " Patchwork
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=20251231055525.51524-3-x.wang@intel.com \
--to=x.wang@intel.com \
--cc=alex.zuo@intel.com \
--cc=igt-dev@lists.freedesktop.org \
--cc=kamil.konieczny@intel.com \
--cc=matthew.d.roper@intel.com \
--cc=ravi.kumar.vodapalli@intel.com \
--cc=shuicheng.lin@intel.com \
--cc=stuart.summers@intel.com \
--cc=zbigniew.kempczynski@intel.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