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    Subject[PATCH 4.13 31/53] drm/i915: Use crtc_state_is_legacy_gamma in intel_color_check
    Date
    4.13-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

    commit d6a55c63e6adcb58957bbdce2d390088970273da upstream.

    crtc_state_is_legacy_gamma also checks for CTM, which was missing from
    intel_color_check. By using the same condition for commit and check
    we reduce the chance of mismatches.

    This was spotted by KASAN while trying to rework kms_color igt test.

    [ 72.008660] ==================================================================
    [ 72.009326] BUG: KASAN: slab-out-of-bounds in bdw_load_gamma_lut.isra.3+0x15c/0x360 [i915]
    [ 72.009519] Read of size 2 at addr ffff880220216e50 by task kms_color/1158
    [ 72.009900] CPU: 2 PID: 1158 Comm: kms_color Tainted: G U W 4.14.0-rc3-patser+ #5281
    [ 72.009921] Hardware name: GIGABYTE GB-BKi3A-7100/MFLP3AP-00, BIOS F1 07/27/2016
    [ 72.009941] Call Trace:
    [ 72.009968] dump_stack+0xc5/0x151
    [ 72.009996] ? _atomic_dec_and_lock+0x10f/0x10f
    [ 72.010024] ? show_regs_print_info+0x3c/0x3c
    [ 72.010072] print_address_description+0x7f/0x240
    [ 72.010108] kasan_report+0x216/0x370
    [ 72.010308] ? bdw_load_gamma_lut.isra.3+0x15c/0x360 [i915]
    [ 72.010349] __asan_load2+0x74/0x80
    [ 72.010552] bdw_load_gamma_lut.isra.3+0x15c/0x360 [i915]
    [ 72.010772] broadwell_load_luts+0x1f0/0x300 [i915]
    [ 72.010997] intel_color_load_luts+0x36/0x40 [i915]
    [ 72.011205] intel_begin_crtc_commit+0xa1/0x310 [i915]
    [ 72.011283] drm_atomic_helper_commit_planes_on_crtc+0xa6/0x320 [drm_kms_helper]
    [ 72.011316] ? wait_for_completion_io+0x460/0x460
    [ 72.011524] intel_update_crtc+0xe3/0x100 [i915]
    [ 72.011720] skl_update_crtcs+0x360/0x3f0 [i915]
    [ 72.011945] ? intel_update_crtcs+0xf0/0xf0 [i915]
    [ 72.012010] ? drm_atomic_helper_wait_for_dependencies+0x3d9/0x400 [drm_kms_helper]
    [ 72.012231] intel_atomic_commit_tail+0x8db/0x1500 [i915]
    [ 72.012273] ? __lock_is_held+0x9c/0xc0
    [ 72.012494] ? skl_update_crtcs+0x3f0/0x3f0 [i915]
    [ 72.012518] ? find_next_bit+0xb/0x10
    [ 72.012544] ? cpumask_next+0x1a/0x20
    [ 72.012745] ? i915_sw_fence_complete+0x9d/0xe0 [i915]
    [ 72.012938] ? __i915_sw_fence_complete+0x5d0/0x5d0 [i915]
    [ 72.013176] intel_atomic_commit+0x528/0x570 [i915]
    [ 72.013280] ? drm_atomic_get_property+0xc00/0xc00 [drm]
    [ 72.013466] ? intel_atomic_commit_tail+0x1500/0x1500 [i915]
    [ 72.013496] ? kmem_cache_alloc_trace+0x266/0x280
    [ 72.013714] ? intel_atomic_commit_tail+0x1500/0x1500 [i915]
    [ 72.013812] drm_atomic_commit+0x77/0x80 [drm]
    [ 72.013911] set_property_atomic+0x14a/0x210 [drm]
    [ 72.014015] ? drm_object_property_get_value+0x70/0x70 [drm]
    [ 72.014080] ? mutex_unlock+0xd/0x10
    [ 72.014292] ? intel_atomic_commit_tail+0x1500/0x1500 [i915]
    [ 72.014379] drm_mode_obj_set_property_ioctl+0x1cf/0x310 [drm]
    [ 72.014481] ? drm_mode_obj_find_prop_id+0xa0/0xa0 [drm]
    [ 72.014510] ? lock_release+0x6c0/0x6c0
    [ 72.014602] ? drm_is_current_master+0x46/0x60 [drm]
    [ 72.014706] drm_ioctl_kernel+0x148/0x1d0 [drm]
    [ 72.014799] ? drm_mode_obj_find_prop_id+0xa0/0xa0 [drm]
    [ 72.014898] ? drm_ioctl_permit+0x100/0x100 [drm]
    [ 72.014936] ? kasan_check_write+0x14/0x20
    [ 72.015039] drm_ioctl+0x441/0x660 [drm]
    [ 72.015129] ? drm_mode_obj_find_prop_id+0xa0/0xa0 [drm]
    [ 72.015235] ? drm_getstats+0x20/0x20 [drm]
    [ 72.015287] ? ___might_sleep+0x159/0x340
    [ 72.015311] ? find_held_lock+0xcf/0xf0
    [ 72.015341] ? __schedule_bug+0x110/0x110
    [ 72.015405] do_vfs_ioctl+0xa88/0xb10
    [ 72.015449] ? ioctl_preallocate+0x1a0/0x1a0
    [ 72.015487] ? selinux_capable+0x20/0x20
    [ 72.015525] ? rcu_dynticks_momentary_idle+0x40/0x40
    [ 72.015607] SyS_ioctl+0x4e/0x80
    [ 72.015647] entry_SYSCALL_64_fastpath+0x18/0xad
    [ 72.015670] RIP: 0033:0x7ff74a3d04d7
    [ 72.015691] RSP: 002b:00007ffc594bec08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
    [ 72.015734] RAX: ffffffffffffffda RBX: ffffffff8718f54a RCX: 00007ff74a3d04d7
    [ 72.015756] RDX: 00007ffc594bec40 RSI: 00000000c01864ba RDI: 0000000000000003
    [ 72.015777] RBP: ffff880211c0ff98 R08: 0000000000000086 R09: 0000000000000000
    [ 72.015799] R10: 00007ff74a691b58 R11: 0000000000000246 R12: 0000000000000355
    [ 72.015821] R13: 00000000ff00eb00 R14: 0000000000000a00 R15: 00007ff746082000
    [ 72.015857] ? trace_hardirqs_off_caller+0xfa/0x110

    Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20171005141520.23990-1-maarten.lankhorst@linux.intel.com
    [mlankhorst: s/crtc_state_is_legacy/&_gamma/ (danvet)]
    Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
    Fixes: 82cf435b3134 ("drm/i915: Implement color management on bdw/skl/bxt/kbl")
    (cherry picked from commit 0c3767b28186c8129f2a2cfec06a93dcd6102391)
    Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/i915/intel_color.c | 16 +++++++---------
    1 file changed, 7 insertions(+), 9 deletions(-)

    --- a/drivers/gpu/drm/i915/intel_color.c
    +++ b/drivers/gpu/drm/i915/intel_color.c
    @@ -58,7 +58,7 @@
    #define I9XX_CSC_COEFF_1_0 \
    ((7 << 12) | I9XX_CSC_COEFF_FP(CTM_COEFF_1_0, 8))

    -static bool crtc_state_is_legacy(struct drm_crtc_state *state)
    +static bool crtc_state_is_legacy_gamma(struct drm_crtc_state *state)
    {
    return !state->degamma_lut &&
    !state->ctm &&
    @@ -245,7 +245,7 @@ static void cherryview_load_csc_matrix(s
    }

    mode = (state->ctm ? CGM_PIPE_MODE_CSC : 0);
    - if (!crtc_state_is_legacy(state)) {
    + if (!crtc_state_is_legacy_gamma(state)) {
    mode |= (state->degamma_lut ? CGM_PIPE_MODE_DEGAMMA : 0) |
    (state->gamma_lut ? CGM_PIPE_MODE_GAMMA : 0);
    }
    @@ -426,7 +426,7 @@ static void broadwell_load_luts(struct d
    struct intel_crtc_state *intel_state = to_intel_crtc_state(state);
    enum pipe pipe = to_intel_crtc(state->crtc)->pipe;

    - if (crtc_state_is_legacy(state)) {
    + if (crtc_state_is_legacy_gamma(state)) {
    haswell_load_luts(state);
    return;
    }
    @@ -486,7 +486,7 @@ static void glk_load_luts(struct drm_crt

    glk_load_degamma_lut(state);

    - if (crtc_state_is_legacy(state)) {
    + if (crtc_state_is_legacy_gamma(state)) {
    haswell_load_luts(state);
    return;
    }
    @@ -508,7 +508,7 @@ static void cherryview_load_luts(struct
    uint32_t i, lut_size;
    uint32_t word0, word1;

    - if (crtc_state_is_legacy(state)) {
    + if (crtc_state_is_legacy_gamma(state)) {
    /* Turn off degamma/gamma on CGM block. */
    I915_WRITE(CGM_PIPE_MODE(pipe),
    (state->ctm ? CGM_PIPE_MODE_CSC : 0));
    @@ -589,12 +589,10 @@ int intel_color_check(struct drm_crtc *c
    return 0;

    /*
    - * We also allow no degamma lut and a gamma lut at the legacy
    + * We also allow no degamma lut/ctm and a gamma lut at the legacy
    * size (256 entries).
    */
    - if (!crtc_state->degamma_lut &&
    - crtc_state->gamma_lut &&
    - crtc_state->gamma_lut->length == LEGACY_LUT_LENGTH)
    + if (crtc_state_is_legacy_gamma(crtc_state))
    return 0;

    return -EINVAL;

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