From 5ce5f61b70f97bd664f7a20aeffd9574d17ab350 Mon Sep 17 00:00:00 2001 From: Mika Kuoppala Date: Fri, 12 Apr 2019 19:53:53 +0300 Subject: [PATCH] drm/i915: Handle catastrophic error on engine reset If cat error is set, we need to clear it by acking it. Further, if it is set, we must not do a normal request for reset. v2: avoid goto (Chris) v3: comment, error format, direct assign (Chris) Bspec: 12567 Cc: Chris Wilson Signed-off-by: Mika Kuoppala Reviewed-by: Chris Wilson Signed-off-by: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20190412165353.16432-1-mika.kuoppala@linux.intel.com --- drivers/gpu/drm/i915/i915_reg.h | 6 ++++-- drivers/gpu/drm/i915/i915_reset.c | 12 +++++++++++- 2 files changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 8ad2f0a..c1c0f7a 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -2446,8 +2446,10 @@ enum i915_power_well_id { #define RING_HWS_PGA(base) _MMIO((base) + 0x80) #define RING_HWS_PGA_GEN6(base) _MMIO((base) + 0x2080) #define RING_RESET_CTL(base) _MMIO((base) + 0xd0) -#define RESET_CTL_REQUEST_RESET (1 << 0) -#define RESET_CTL_READY_TO_RESET (1 << 1) +#define RESET_CTL_CAT_ERROR REG_BIT(2) +#define RESET_CTL_READY_TO_RESET REG_BIT(1) +#define RESET_CTL_REQUEST_RESET REG_BIT(0) + #define RING_SEMA_WAIT_POLL(base) _MMIO((base) + 0x24c) #define HSW_GTT_CACHE_EN _MMIO(0x4024) diff --git a/drivers/gpu/drm/i915/i915_reset.c b/drivers/gpu/drm/i915/i915_reset.c index 8ce819b..bc5f9c6 100644 --- a/drivers/gpu/drm/i915/i915_reset.c +++ b/drivers/gpu/drm/i915/i915_reset.c @@ -495,7 +495,17 @@ static int gen8_engine_reset_prepare(struct intel_engine_cs *engine) int ret; ack = intel_uncore_read_fw(uncore, reg); - if (!(ack & RESET_CTL_READY_TO_RESET)) { + if (ack & RESET_CTL_CAT_ERROR) { + /* + * For catastrophic errors, ready-for-reset sequence + * needs to be bypassed: HAS#396813 + */ + request = RESET_CTL_CAT_ERROR; + mask = RESET_CTL_CAT_ERROR; + + /* Catastrophic errors need to be cleared by HW */ + ack = 0; + } else if (!(ack & RESET_CTL_READY_TO_RESET)) { request = RESET_CTL_REQUEST_RESET; mask = RESET_CTL_READY_TO_RESET; ack = RESET_CTL_READY_TO_RESET; -- 2.7.4