From 3ccfd19dea7c5c85aa4b1f929a97a02b026ab356 Mon Sep 17 00:00:00 2001 From: Ben Widawsky Date: Wed, 18 Sep 2013 19:03:18 -0700 Subject: [PATCH] drm/i915: Do remaps for all contexts MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit On both Ivybridge and Haswell, row remapping information is saved and restored with context. This means, we never actually properly supported the l3 remapping because our sysfs interface is asynchronous (and not tied to any context), and the known faulty HW would be reused by the next context to run. Not that due to the asynchronous nature of the sysfs entry, there is no point modifying the registers for the existing context. Instead we set a flag for all contexts to load the correct remapping information on the next run. Interested clients can use debugfs to determine whether or not the row has been remapped. One could propose at this point that we just do the remapping in the kernel. I guess since we have to maintain the sysfs interface anyway, I'm not sure how useful it is, and I do like keeping the policy in userspace; (it wasn't my original decision to make the interface the way it is, so I'm not attached). v2: Force a context switch when we have a remap on the next switch. (Ville) Don't let userspace use the interface with disabled contexts. v3: Don't force a context switch, just let it nop Improper context slice remap initialization, 1<<1 instead of 1< Signed-off-by: Ben Widawsky Reviewed-by: Ville Syrjälä Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_debugfs.c | 8 ++++++ drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/i915_gem_context.c | 22 ++++++++++++--- drivers/gpu/drm/i915/i915_sysfs.c | 37 ++++++++++--------------- 4 files changed, 41 insertions(+), 27 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index ada095023dad..80bed69fe5b7 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -145,6 +145,13 @@ describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj) seq_printf(m, " (%s)", obj->ring->name); } +static void describe_ctx(struct seq_file *m, struct i915_hw_context *ctx) +{ + seq_putc(m, ctx->is_initialized ? 'I' : 'i'); + seq_putc(m, ctx->remap_slice ? 'R' : 'r'); + seq_putc(m, ' '); +} + static int i915_gem_object_list_info(struct seq_file *m, void *data) { struct drm_info_node *node = (struct drm_info_node *) m->private; @@ -1463,6 +1470,7 @@ static int i915_context_status(struct seq_file *m, void *unused) list_for_each_entry(ctx, &dev_priv->context_list, link) { seq_puts(m, "HW context "); + describe_ctx(m, ctx); for_each_ring(ring, dev_priv, i) if (ring->default_context == ctx) seq_printf(m, "(default context %s) ", ring->name); diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 179592762537..015df5264dcc 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -601,6 +601,7 @@ struct i915_hw_context { struct kref ref; int id; bool is_initialized; + uint8_t remap_slice; struct drm_i915_file_private *file_priv; struct intel_ring_buffer *ring; struct drm_i915_gem_object *obj; diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index 2bbdce821ac3..9af3fe7e42b0 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -181,6 +181,10 @@ create_hw_context(struct drm_device *dev, ctx->file_priv = file_priv; ctx->id = ret; + /* NB: Mark all slices as needing a remap so that when the context first + * loads it will restore whatever remap state already exists. If there + * is no remap info, it will be a NOP. */ + ctx->remap_slice = (1 << NUM_L3_SLICES(dev)) - 1; return ctx; @@ -396,11 +400,11 @@ static int do_switch(struct i915_hw_context *to) struct intel_ring_buffer *ring = to->ring; struct i915_hw_context *from = ring->last_context; u32 hw_flags = 0; - int ret; + int ret, i; BUG_ON(from != NULL && from->obj != NULL && from->obj->pin_count == 0); - if (from == to) + if (from == to && !to->remap_slice) return 0; ret = i915_gem_obj_ggtt_pin(to->obj, CONTEXT_ALIGN, false, false); @@ -423,8 +427,6 @@ static int do_switch(struct i915_hw_context *to) if (!to->is_initialized || is_default_context(to)) hw_flags |= MI_RESTORE_INHIBIT; - else if (WARN_ON_ONCE(from == to)) /* not yet expected */ - hw_flags |= MI_FORCE_RESTORE; ret = mi_set_context(ring, to, hw_flags); if (ret) { @@ -432,6 +434,18 @@ static int do_switch(struct i915_hw_context *to) return ret; } + for (i = 0; i < MAX_L3_SLICES; i++) { + if (!(to->remap_slice & (1<remap_slice &= ~(1<dev; struct drm_i915_private *dev_priv = drm_dev->dev_private; - uint32_t misccpctl; int slice = (int)(uintptr_t)attr->private; - int i, ret; + int ret; count = round_down(count, 4); @@ -134,26 +133,13 @@ i915_l3_read(struct file *filp, struct kobject *kobj, if (ret) return ret; - if (IS_HASWELL(drm_dev)) { - if (dev_priv->l3_parity.remap_info[slice]) - memcpy(buf, - dev_priv->l3_parity.remap_info[slice] + (offset/4), - count); - else - memset(buf, 0, count); - - goto out; - } - - misccpctl = I915_READ(GEN7_MISCCPCTL); - I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE); - - for (i = 0; i < count; i += 4) - *((uint32_t *)(&buf[i])) = I915_READ(GEN7_L3LOG_BASE + offset + i); - - I915_WRITE(GEN7_MISCCPCTL, misccpctl); + if (dev_priv->l3_parity.remap_info[slice]) + memcpy(buf, + dev_priv->l3_parity.remap_info[slice] + (offset/4), + count); + else + memset(buf, 0, count); -out: mutex_unlock(&drm_dev->struct_mutex); return count; @@ -168,6 +154,7 @@ i915_l3_write(struct file *filp, struct kobject *kobj, struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); struct drm_device *drm_dev = dminor->dev; struct drm_i915_private *dev_priv = drm_dev->dev_private; + struct i915_hw_context *ctx; u32 *temp = NULL; /* Just here to make handling failures easy */ int slice = (int)(uintptr_t)attr->private; int ret; @@ -176,6 +163,9 @@ i915_l3_write(struct file *filp, struct kobject *kobj, if (ret) return ret; + if (dev_priv->hw_contexts_disabled) + return -ENXIO; + ret = i915_mutex_lock_interruptible(drm_dev); if (ret) return ret; @@ -204,8 +194,9 @@ i915_l3_write(struct file *filp, struct kobject *kobj, memcpy(dev_priv->l3_parity.remap_info[slice] + (offset/4), buf, count); - if (i915_gem_l3_remap(&dev_priv->ring[RCS], slice)) - count = 0; + /* NB: We defer the remapping until we switch to the context */ + list_for_each_entry(ctx, &dev_priv->context_list, link) + ctx->remap_slice |= (1<struct_mutex); -- 2.30.2