We need add some checks around DMC reloading to prevents the rare possibility of some adversary writing to a random mmio register
BSpec: 49193 Cc: Imre Deak <[email protected]> Signed-off-by: Anusha Srivatsa <[email protected]> --- .../drm/i915/display/intel_display_power.c | 23 +++++++++++++++++++ drivers/gpu/drm/i915/i915_reg.h | 10 ++++++++ 2 files changed, 33 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c index 3dc859032bac..81cc4c658e3f 100644 --- a/drivers/gpu/drm/i915/display/intel_display_power.c +++ b/drivers/gpu/drm/i915/display/intel_display_power.c @@ -29,6 +29,8 @@ #include "intel_vga.h" #include "vlv_sideband.h" +#define DMC_EVT_HTP_CTL_MAX 8 + const char * intel_display_power_domain_str(enum intel_display_power_domain domain) { @@ -1101,6 +1103,26 @@ static void gen9_assert_dbuf_enabled(struct drm_i915_private *dev_priv) enabled_dbuf_slices); } +static void tgl_dmc_mmio_prog(struct drm_i915_private *dev_priv) +{ + struct intel_dmc *dmc = &dev_priv->dmc; + int i, id; + + for (i = 0; i <= DMC_EVT_HTP_CTL_MAX; i++) { + intel_de_write(dev_priv, TGL_MAIN_DMC_EVT_CTL(i), DMC_EVT_CTL_VAL); + intel_de_write(dev_priv, TGL_MAIN_DMC_EVT_HTP(i), DMC_EVT_HTP_VAL); + } + /* Pipe DMC MMIOs */ + for (id = 1; i <= DMC_FW_MAX; id++) { + for (i = 0; i <= DMC_EVT_HTP_CTL_MAX; i++) { + intel_de_write(dev_priv, PIPEDMC_EVT_CTL_OFFSET(dmc->dmc_info[id].start_mmioaddr, i), + DMC_EVT_CTL_VAL); + intel_de_write(dev_priv, PIPEDMC_EVT_HTP_OFFSET(dmc->dmc_info[id].start_mmioaddr, i), + DMC_EVT_HTP_VAL); + } + } +} + static void gen9_disable_dc_states(struct drm_i915_private *dev_priv) { struct intel_cdclk_config cdclk_config = {}; @@ -1139,6 +1161,7 @@ static void gen9_dc_off_power_well_enable(struct drm_i915_private *dev_priv, struct i915_power_well *power_well) { gen9_disable_dc_states(dev_priv); + tgl_dmc_mmio_prog(dev_priv); } static void gen9_dc_off_power_well_disable(struct drm_i915_private *dev_priv, diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index a0d652f19ff9..7e3ef777c26d 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -5525,6 +5525,16 @@ #define TGL_DMC_DEBUG3 _MMIO(0x101090) #define DG1_DMC_DEBUG3 _MMIO(0x13415c) +/* Main DMC EVT_HTP and EVT_CTL registers */ +#define DMC_EVT_CTL_VAL 0x00030100 +#define DMC_EVT_HTP_VAL 0x00000000 +#define TGL_MAIN_DMC_EVT_HTP(n) _MMIO(0x8F004 + (n) * 4) +#define TGL_MAIN_DMC_EVT_CTL(n) _MMIO(0x8F034 + (n) * 4) +#define PIPEDMC_EVT_HTP_BASE 0x00004 +#define PIPEDMC_EVT_CTL_BASE 0x00034 +#define PIPEDMC_EVT_HTP_OFFSET(addr, i) _MMIO(addr + PIPEDMC_EVT_HTP_BASE + (i * 4)) +#define PIPEDMC_EVT_CTL_OFFSET(addr, i) _MMIO(addr + PIPEDMC_EVT_CTL_BASE + (i * 4)) + /* Display Internal Timeout Register */ #define RM_TIMEOUT _MMIO(0x42060) #define MMIO_TIMEOUT_US(us) ((us) << 0) -- 2.25.1
