• Denys Vlasenko's avatar
    radeon: Deinline indirect register accessor functions · 9e5acbc2
    Denys Vlasenko authored
    This patch deinlines indirect register accessor functions.
    
    These functions perform two mmio accesses, framed by spin lock/unlock.
    Spin lock/unlock by itself takes more than 50 cycles in ideal case
    (if lock is exclusively cached on current CPU).
    
    With this .config: http://busybox.net/~vda/kernel_config,
    after uninlining these functions have sizes and callsite counts
    as follows:
    
    r600_uvd_ctx_rreg: 111 bytes, 4 callsites
    r600_uvd_ctx_wreg: 113 bytes, 5 callsites
    eg_pif_phy0_rreg: 106 bytes, 13 callsites
    eg_pif_phy0_wreg: 108 bytes, 13 callsites
    eg_pif_phy1_rreg: 107 bytes, 13 callsites
    eg_pif_phy1_wreg: 108 bytes, 13 callsites
    rv370_pcie_rreg: 111 bytes, 21 callsites
    rv370_pcie_wreg: 113 bytes, 24 callsites
    r600_rcu_rreg: 111 bytes, 16 callsites
    r600_rcu_wreg: 113 bytes, 25 callsites
    cik_didt_rreg: 106 bytes, 10 callsites
    cik_didt_wreg: 107 bytes, 10 callsites
    tn_smc_rreg: 106 bytes, 126 callsites
    tn_smc_wreg: 107 bytes, 116 callsites
    eg_cg_rreg: 107 bytes, 20 callsites
    eg_cg_wreg: 108 bytes, 52 callsites
    
    Functions r100_mm_rreg() and r100_mm_rreg() have a fast path and
    a locked (slow) path. This patch deinlines only slow path.
    
    r100_mm_rreg_slow: 78 bytes, 2083 callsites
    r100_mm_wreg_slow: 81 bytes, 3570 callsites
    
    Reduction in code size is more than 65,000 bytes:
    
        text     data      bss       dec     hex filename
    85740176 22294680 20627456 128662312 7ab3b28 vmlinux.before
    85674192 22294776 20627456 128598664 7aa4288 vmlinux
    Signed-off-by: default avatarDenys Vlasenko <dvlasenk@redhat.com>
    Cc: Christian König <christian.koenig@amd.com>
    Cc: Alex Deucher <alexander.deucher@amd.com>
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
    9e5acbc2
ni.c 70.2 KB