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drm/xe/hwmon: Cast result to output precision on left shift of operand

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BugLink: https://bugs.launchpad.net/bugs/2065912

[ Upstream commit a8ad8715472bb8f6a2ea8b4072a28151eb9f4f24 ]

Address potential overflow in result of left shift of a
lower precision (u32) operand before assignment to higher
precision (u64) variable.

v2:
 - Update commit message. (Himal)

Fixes: 4446fcf220 ("drm/xe/hwmon: Expose power1_max_interval")
Signed-off-by: Karthik Poosa <karthik.poosa@intel.com>
Reviewed-by: Anshuman Gupta <anshuman.gupta@intel.com>
Cc: Badal Nilawar <badal.nilawar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240405130127.1392426-5-karthik.poosa@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
(cherry picked from commit 883232b47b81108b0252197c747f396ecd51455a)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Karthik Poosa
2024-04-05 18:31:27 +05:30
committed by Stefan Bader
parent 736d082dfa
commit e6fa6ade46
1 changed files with 2 additions and 2 deletions
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drivers/gpu/drm/xe/xe_hwmon.c
+2 -2
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@@ -288,7 +288,7 @@ xe_hwmon_power1_max_interval_show(struct device *dev, struct device_attribute *a
* As y can be < 2, we compute tau4 = (4 | x) << y
* and then add 2 when doing the final right shift to account for units
*/
tau4 = ((1 << x_w) | x) << y;
tau4 = (u64)((1 << x_w) | x) << y;
/* val in hwmon interface units (millisec) */
out = mul_u64_u32_shr(tau4, SF_TIME, hwmon->scl_shift_time + x_w);
@@ -328,7 +328,7 @@ xe_hwmon_power1_max_interval_store(struct device *dev, struct device_attribute *
r = FIELD_PREP(PKG_MAX_WIN, PKG_MAX_WIN_DEFAULT);
x = REG_FIELD_GET(PKG_MAX_WIN_X, r);
y = REG_FIELD_GET(PKG_MAX_WIN_Y, r);
tau4 = ((1 << x_w) | x) << y;
tau4 = (u64)((1 << x_w) | x) << y;
max_win = mul_u64_u32_shr(tau4, SF_TIME, hwmon->scl_shift_time + x_w);
if (val > max_win)