drm/i915: Allow optimized platform checks

From: Tvrtko Ursulin <[email protected]>

If we store the platform as a bitmask, and convert the IS_PLATFORM macro to use it, we allow the compiler to merge the IS_PLATFORM(a) || IS_PLATFORM(b) || ... checks into a single conditional.

As a secondary benefit this saves almost 1k of text:

text data bss dec hex filename

-1460254          60014    3656 1523924  1740d4 drivers/gpu/drm/i915/i915.ko
+1459260          60026    3656 1522942  173cfe drivers/gpu/drm/i915/i915.ko

v2: Removed the infamous -1.

Signed-off-by Tvrtko Ursulin <[email protected]>

Cc Jani Nikula <[email protected]>

== Series Details ==

Series: drm/i915: Allow optimized platform checks
URL : https://patchwork.freedesktop.org/series/30982/
State : success

== Summary ==

Series 30982v1 drm/i915: Allow optimized platform checks
https://patchwork.freedesktop.org/api/1.0/series/30982/revisions/1/mbox/

Test drv_module_reload:

         Subgroup basic-reload:
                 dmesg-warn -> PASS       (fi-glk-1) fdo#102777

fdo#102777 https://bugs.freedesktop.org/show_bug.cgi?id=102777

fi-bdw-5557u     total:289  pass:268  dwarn:0   dfail:0   fail:0   skip:21  time:440s
fi-bdw-gvtdvm    total:289  pass:265  dwarn:0   dfail:0   fail:0   skip:24  time:479s
fi-blb-e6850     total:289  pass:224  dwarn:1   dfail:0   fail:0   skip:64  time:419s
fi-bsw-n3050     total:289  pass:243  dwarn:0   dfail:0   fail:0   skip:46  time:519s
fi-bwr-2160      total:289  pass:184  dwarn:0   dfail:0   fail:0   skip:105 time:282s
fi-bxt-j4205     total:289  pass:260  dwarn:0   dfail:0   fail:0   skip:29  time:499s
fi-byt-j1900     total:289  pass:254  dwarn:1   dfail:0   fail:0   skip:34  time:492s
fi-cfl-s         total:289  pass:223  dwarn:34  dfail:0   fail:0   skip:32  time:544s
fi-cnl-y         total:289  pass:258  dwarn:0   dfail:0   fail:4   skip:27  time:637s
fi-elk-e7500     total:289  pass:230  dwarn:0   dfail:0   fail:0   skip:59  time:420s
fi-glk-1         total:289  pass:260  dwarn:0   dfail:0   fail:0   skip:29  time:568s
fi-hsw-4770      total:289  pass:263  dwarn:0   dfail:0   fail:0   skip:26  time:424s
fi-hsw-4770r     total:289  pass:263  dwarn:0   dfail:0   fail:0   skip:26  time:405s
fi-ilk-650       total:289  pass:229  dwarn:0   dfail:0   fail:0   skip:60  time:437s
fi-ivb-3520m     total:289  pass:261  dwarn:0   dfail:0   fail:0   skip:28  time:493s
fi-ivb-3770      total:289  pass:261  dwarn:0   dfail:0   fail:0   skip:28  time:468s
fi-kbl-7500u     total:289  pass:264  dwarn:1   dfail:0   fail:0   skip:24  time:471s
fi-kbl-7560u     total:289  pass:270  dwarn:0   dfail:0   fail:0   skip:19  time:584s
fi-kbl-r         total:289  pass:262  dwarn:0   dfail:0   fail:0   skip:27  time:593s
fi-pnv-d510      total:289  pass:223  dwarn:1   dfail:0   fail:0   skip:65  time:546s
fi-skl-6260u     total:289  pass:269  dwarn:0   dfail:0   fail:0   skip:20  time:446s
fi-skl-6700k     total:289  pass:265  dwarn:0   dfail:0   fail:0   skip:24  time:745s
fi-skl-6770hq    total:289  pass:269  dwarn:0   dfail:0   fail:0   skip:20  time:485s
fi-skl-gvtdvm    total:289  pass:266  dwarn:0   dfail:0   fail:0   skip:23  time:473s
fi-snb-2520m     total:289  pass:251  dwarn:0   dfail:0   fail:0   skip:38  time:567s
fi-snb-2600      total:289  pass:250  dwarn:0   dfail:0   fail:0   skip:39  time:410s

aa884e1abdf2ffb7db8c524fc6269280734e5145 drm-tip: 2017y-09m-27d-15h-39m-07s UTC integration manifest 6ef30a4343e1 drm/i915: Allow optimized platform checks

From: Tvrtko Ursulin <[email protected]>

If we store the platform as a bitmask, and convert the IS_PLATFORM macro to use it, we allow the compiler to merge the IS_PLATFORM(a) || IS_PLATFORM(b) || ... checks into a single conditional.

As a secondary benefit this saves almost 1k of text:

text data bss dec hex filename

-1460254          60014    3656 1523924  1740d4 drivers/gpu/drm/i915/i915.ko
+1459260          60026    3656 1522942  173cfe drivers/gpu/drm/i915/i915.ko

v2: Removed the infamous -1.

Signed-off-by Tvrtko Ursulin <[email protected]>

Cc Jani Nikula <[email protected]>

---
 drivers/gpu/drm/i915/i915_drv.c | 4 ++++
 drivers/gpu/drm/i915/i915_drv.h | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

drivers/gpu/drm/i915/i915_drv.c +4 -0

index 03bbe23e4df8..187c0fad1b79 100644
@@ -870,6 +870,10 @@ static int i915_driver_init_early(struct drm_i915_private *dev_priv,
 	memcpy(device_info, match_info, sizeof(*device_info));
 	device_info->device_id = dev_priv->drm.pdev->device;
 
+	BUILD_BUG_ON(INTEL_MAX_PLATFORMS >
+		     sizeof(device_info->platform_mask) * BITS_PER_BYTE);
+	device_info->platform_mask = BIT(device_info->platform);
+
 	BUG_ON(device_info->gen > sizeof(device_info->gen_mask) * BITS_PER_BYTE);
 	device_info->gen_mask = BIT(device_info->gen - 1);
 

drivers/gpu/drm/i915/i915_drv.h +2 -1

index bda91db3fc46..3a6a34882427 100644
@@ -861,6 +861,7 @@ struct intel_device_info {
 	u8 ring_mask; /* Rings supported by the HW */
 
 	enum intel_platform platform;
+	u32 platform_mask;
 
 	u32 display_mmio_offset;
 

@@ -2986,7 +2987,7 @@ intel_info(const struct drm_i915_private *dev_priv)
 #define IS_REVID(p, since, until) \
 	(INTEL_REVID(p) >= (since) && INTEL_REVID(p) <= (until))
 
-#define IS_PLATFORM(dev_priv, p) ((dev_priv)->info.platform == (p))
+#define IS_PLATFORM(dev_priv, p) ((dev_priv)->info.platform_mask & BIT(p))
 
 #define IS_I830(dev_priv)	IS_PLATFORM(dev_priv, INTEL_I830)
 #define IS_I845G(dev_priv)	IS_PLATFORM(dev_priv, INTEL_I845G)

From: Tvrtko Ursulin <[email protected]>

If we store the platform as a bitmask, and convert the IS_PLATFORM macro to use it, we allow the compiler to merge the IS_PLATFORM(a) || IS_PLATFORM(b) || ... checks into a single conditional.

As a secondary benefit this saves almost 1k of text:

text data bss dec hex filename

-1460254          60014    3656 1523924  1740d4 drivers/gpu/drm/i915/i915.ko
+1459260          60026    3656 1522942  173cfe drivers/gpu/drm/i915/i915.ko

v2: Removed the infamous -1.

Signed-off-by Tvrtko Ursulin <[email protected]>

Cc Jani Nikula <[email protected]>