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authorVille Syrjälä <ville.syrjala@linux.intel.com>2015-11-18 15:33:26 +0200
committerVille Syrjälä <ville.syrjala@linux.intel.com>2015-11-18 15:39:11 +0200
commitf0f59a00a1c9be11038bef5aa735ed7dd985f9cf (patch)
tree1b76f7943326743233be6436376750ba4db78af4 /drivers/gpu/drm/i915/i915_vgpu.h
parent9bca5d0ca76c0ce029e2b43cf081863e7e8f6768 (diff)
drm/i915: Type safe register read/write
Make I915_READ and I915_WRITE more type safe by wrapping the register offset in a struct. This should eliminate most of the fumbles we've had with misplaced parens. This only takes care of normal mmio registers. We could extend the idea to other register types and define each with its own struct. That way you wouldn't be able to accidentally pass the wrong thing to a specific register access function. The gpio_reg setup is probably the ugliest thing left. But I figure I'd just leave it for now, and wait for some divine inspiration to strike before making it nice. As for the generated code, it's actually a bit better sometimes. Eg. looking at i915_irq_handler(), we can see the following change: lea 0x70024(%rdx,%rax,1),%r9d mov $0x1,%edx - movslq %r9d,%r9 - mov %r9,%rsi - mov %r9,-0x58(%rbp) - callq *0xd8(%rbx) + mov %r9d,%esi + mov %r9d,-0x48(%rbp) callq *0xd8(%rbx) So previously gcc thought the register offset might be signed and decided to sign extend it, just in case. The rest appears to be mostly just minor shuffling of instructions. v2: i915_mmio_reg_{offset,equal,valid}() helpers added s/_REG/_MMIO/ in the register defines mo more switch statements left to worry about ring_emit stuff got sorted in a prep patch cmd parser, lrc context and w/a batch buildup also in prep patch vgpu stuff cleaned up and moved to a prep patch all other unrelated changes split out v3: Rebased due to BXT DSI/BLC, MOCS, etc. v4: Rebased due to churn, s/i915_mmio_reg_t/i915_reg_t/ Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/1447853606-2751-1-git-send-email-ville.syrjala@linux.intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/i915_vgpu.h')
-rw-r--r--drivers/gpu/drm/i915/i915_vgpu.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/i915_vgpu.h b/drivers/gpu/drm/i915/i915_vgpu.h
index 2c97d5a47e6d..3c83b47b5f69 100644
--- a/drivers/gpu/drm/i915/i915_vgpu.h
+++ b/drivers/gpu/drm/i915/i915_vgpu.h
@@ -104,7 +104,7 @@ struct vgt_if {
} __packed;
#define vgtif_reg(x) \
- (VGT_PVINFO_PAGE + (long)&((struct vgt_if *)NULL)->x)
+ _MMIO((VGT_PVINFO_PAGE + (long)&((struct vgt_if *)NULL)->x))
/* vGPU display status to be used by the host side */
#define VGT_DRV_DISPLAY_NOT_READY 0