[Intel-gfx] [PATCH] drm/i915: initialization/teardown for the aliasing ppgtt
Daniel Vetter
daniel.vetter at ffwll.ch
Tue Nov 29 21:55:18 CET 2011
This just adds the setup and teardown code for the ppgtt PDE and the
last-level pagetables, which are fixed for the entire lifetime, at
least for the moment.
v2: Kill the stray debug printk noted by and improve the pte
definitions as suggested by Chris Wilson.
v3: Clean up the aperture stealing code as noted by Ben Widawsky.
v4: Paint the init code in a more pleasing colour as suggest by Chris
Wilson.
v5: Explain the magic numbers noticed by Ben Widawsky.
Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
drivers/gpu/drm/i915/i915_dma.c | 41 ++++++++---
drivers/gpu/drm/i915/i915_drv.h | 18 +++++
drivers/gpu/drm/i915/i915_gem_gtt.c | 139 +++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_reg.h | 18 +++++
4 files changed, 205 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index fd617fb..2cc0ba4 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1190,22 +1190,39 @@ static int i915_load_gem_init(struct drm_device *dev)
/* Basic memrange allocator for stolen space */
drm_mm_init(&dev_priv->mm.stolen, 0, prealloc_size);
- /* Let GEM Manage all of the aperture.
- *
- * However, leave one page at the end still bound to the scratch page.
- * There are a number of places where the hardware apparently
- * prefetches past the end of the object, and we've seen multiple
- * hangs with the GPU head pointer stuck in a batchbuffer bound
- * at the last page of the aperture. One page should be enough to
- * keep any prefetching inside of the aperture.
- */
- i915_gem_do_init(dev, 0, mappable_size, gtt_size - PAGE_SIZE);
+ if (HAS_ALIASING_PPGTT(dev)) {
+ /* PPGTT pdes are stolen from global gtt ptes, so shrink the
+ * aperture accordingly when using aliasing ppgtt. */
+ gtt_size -= I915_PPGTT_PD_ENTRIES*PAGE_SIZE;
+ /* For paranoia keep the guard page in between. */
+ gtt_size -= PAGE_SIZE;
+
+ i915_gem_do_init(dev, 0, mappable_size, gtt_size);
+
+ ret = i915_gem_init_aliasing_ppgtt(dev);
+ if (ret)
+ return ret;
+ } else {
+ /* Let GEM Manage all of the aperture.
+ *
+ * However, leave one page at the end still bound to the scratch
+ * page. There are a number of places where the hardware
+ * apparently prefetches past the end of the object, and we've
+ * seen multiple hangs with the GPU head pointer stuck in a
+ * batchbuffer bound at the last page of the aperture. One page
+ * should be enough to keep any prefetching inside of the
+ * aperture.
+ */
+ i915_gem_do_init(dev, 0, mappable_size, gtt_size - PAGE_SIZE);
+ }
mutex_lock(&dev->struct_mutex);
ret = i915_gem_init_hw(dev);
mutex_unlock(&dev->struct_mutex);
- if (ret)
+ if (ret) {
+ i915_gem_cleanup_aliasing_ppgtt(dev);
return ret;
+ }
/* Try to set up FBC with a reasonable compressed buffer size */
if (I915_HAS_FBC(dev) && i915_powersave) {
@@ -1292,6 +1309,7 @@ cleanup_gem:
mutex_lock(&dev->struct_mutex);
i915_gem_cleanup_ringbuffer(dev);
mutex_unlock(&dev->struct_mutex);
+ i915_gem_cleanup_aliasing_ppgtt(dev);
cleanup_vga_switcheroo:
vga_switcheroo_unregister_client(dev->pdev);
cleanup_vga_client:
@@ -2179,6 +2197,7 @@ int i915_driver_unload(struct drm_device *dev)
i915_gem_free_all_phys_object(dev);
i915_gem_cleanup_ringbuffer(dev);
mutex_unlock(&dev->struct_mutex);
+ i915_gem_cleanup_aliasing_ppgtt(dev);
if (I915_HAS_FBC(dev) && i915_powersave)
i915_cleanup_compression(dev);
drm_mm_takedown(&dev_priv->mm.stolen);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bdbd6d8..8b6f1b7 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -254,6 +254,16 @@ struct intel_device_info {
u8 has_blt_ring:1;
};
+#define I915_PPGTT_PD_ENTRIES 512
+#define I915_PPGTT_PT_ENTRIES 1024
+struct i915_hw_ppgtt {
+ unsigned num_pd_entries;
+ struct page **pt_pages;
+ uint32_t pd_offset;
+ dma_addr_t *pt_dma_addr;
+ dma_addr_t scratch_page_dma_addr;
+};
+
enum no_fbc_reason {
FBC_NO_OUTPUT, /* no outputs enabled to compress */
FBC_STOLEN_TOO_SMALL, /* not enough space to hold compressed buffers */
@@ -584,6 +594,9 @@ typedef struct drm_i915_private {
struct io_mapping *gtt_mapping;
int gtt_mtrr;
+ /** PPGTT used for aliasing the PPGTT with the GTT */
+ struct i915_hw_ppgtt *aliasing_ppgtt;
+
struct shrinker inactive_shrinker;
/**
@@ -976,6 +989,8 @@ struct drm_i915_file_private {
#define HAS_BLT(dev) (INTEL_INFO(dev)->has_blt_ring)
#define I915_NEED_GFX_HWS(dev) (INTEL_INFO(dev)->need_gfx_hws)
+#define HAS_ALIASING_PPGTT(dev) (INTEL_INFO(dev)->gen >=6)
+
#define HAS_OVERLAY(dev) (INTEL_INFO(dev)->has_overlay)
#define OVERLAY_NEEDS_PHYSICAL(dev) (INTEL_INFO(dev)->overlay_needs_physical)
@@ -1247,6 +1262,9 @@ int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
enum i915_cache_level cache_level);
/* i915_gem_gtt.c */
+int __must_check i915_gem_init_aliasing_ppgtt(struct drm_device *dev);
+void i915_gem_cleanup_aliasing_ppgtt(struct drm_device *dev);
+
void i915_gem_restore_gtt_mappings(struct drm_device *dev);
int __must_check i915_gem_gtt_bind_object(struct drm_i915_gem_object *obj);
void i915_gem_gtt_rebind_object(struct drm_i915_gem_object *obj,
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 6042c5e..548b885 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -29,6 +29,145 @@
#include "i915_trace.h"
#include "intel_drv.h"
+/* PPGTT support for Sandybdrige/Gen6 and later */
+static void i915_ppgtt_clear_range(struct i915_hw_ppgtt *ppgtt,
+ unsigned first_entry,
+ unsigned num_entries)
+{
+ int i, j;
+ uint32_t *pt_vaddr;
+ uint32_t scratch_pte;
+
+ scratch_pte = GEN6_PTE_ADDR_ENCODE(ppgtt->scratch_page_dma_addr);
+ scratch_pte |= GEN6_PTE_VALID | GEN6_PTE_CACHE_LLC;
+
+ for (i = 0; i < ppgtt->num_pd_entries; i++) {
+ pt_vaddr = kmap_atomic(ppgtt->pt_pages[i]);
+
+ for (j = 0; j < I915_PPGTT_PT_ENTRIES; j++)
+ pt_vaddr[j] = scratch_pte;
+
+ kunmap_atomic(pt_vaddr);
+ }
+
+}
+
+int i915_gem_init_aliasing_ppgtt(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct i915_hw_ppgtt *ppgtt;
+ uint32_t pd_entry;
+ unsigned first_pd_entry_in_global_pt;
+ uint32_t __iomem *pd_addr;
+ int i;
+ int ret = -ENOMEM;
+
+ /* ppgtt PDEs reside in the global gtt pagetable, which has 512*1024
+ * entries. For aliasing ppgtt support we just steal them at the end for
+ * now. */
+ first_pd_entry_in_global_pt = 512*1024 - I915_PPGTT_PD_ENTRIES;
+
+ ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL);
+ if (!ppgtt)
+ return ret;
+
+ ppgtt->num_pd_entries = I915_PPGTT_PD_ENTRIES;
+ ppgtt->pt_pages = kzalloc(sizeof(struct page *)*ppgtt->num_pd_entries,
+ GFP_KERNEL);
+ if (!ppgtt->pt_pages)
+ goto err_ppgtt;
+
+ for (i = 0; i < ppgtt->num_pd_entries; i++) {
+ ppgtt->pt_pages[i] = alloc_page(GFP_KERNEL);
+ if (!ppgtt->pt_pages[i])
+ goto err_pt_alloc;
+ }
+
+ if (dev_priv->mm.gtt->needs_dmar) {
+ ppgtt->pt_dma_addr = kzalloc(sizeof(dma_addr_t)
+ *ppgtt->num_pd_entries,
+ GFP_KERNEL);
+ if (!ppgtt->pt_dma_addr)
+ goto err_pt_alloc;
+ }
+
+ pd_addr = dev_priv->mm.gtt->gtt + first_pd_entry_in_global_pt;
+ for (i = 0; i < ppgtt->num_pd_entries; i++) {
+ dma_addr_t pt_addr;
+ if (dev_priv->mm.gtt->needs_dmar) {
+ pt_addr = pci_map_page(dev->pdev, ppgtt->pt_pages[i],
+ 0, 4096,
+ PCI_DMA_BIDIRECTIONAL);
+
+ if (pci_dma_mapping_error(dev->pdev,
+ pt_addr)) {
+ ret = -EIO;
+ goto err_pd_pin;
+
+ }
+ ppgtt->pt_dma_addr[i] = pt_addr;
+ } else
+ pt_addr = page_to_phys(ppgtt->pt_pages[i]);
+
+ pd_entry = GEN6_PDE_ADDR_ENCODE(pt_addr);
+ pd_entry |= GEN6_PDE_VALID;
+
+ writel(pd_entry, pd_addr + i);
+ }
+ readl(pd_addr);
+
+ ppgtt->scratch_page_dma_addr = dev_priv->mm.gtt->scratch_page_dma;
+
+ i915_ppgtt_clear_range(ppgtt, 0,
+ ppgtt->num_pd_entries*I915_PPGTT_PT_ENTRIES);
+
+ ppgtt->pd_offset = (first_pd_entry_in_global_pt)*sizeof(uint32_t);
+
+ dev_priv->mm.aliasing_ppgtt = ppgtt;
+
+ return 0;
+
+err_pd_pin:
+ if (ppgtt->pt_dma_addr) {
+ for (i--; i >= 0; i--)
+ pci_unmap_page(dev->pdev, ppgtt->pt_dma_addr[i],
+ 4096, PCI_DMA_BIDIRECTIONAL);
+ }
+err_pt_alloc:
+ kfree(ppgtt->pt_dma_addr);
+ for (i = 0; i < ppgtt->num_pd_entries; i++) {
+ if (ppgtt->pt_pages[i])
+ __free_page(ppgtt->pt_pages[i]);
+ }
+ kfree(ppgtt->pt_pages);
+err_ppgtt:
+ kfree(ppgtt);
+
+ return ret;
+}
+
+void i915_gem_cleanup_aliasing_ppgtt(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt;
+ int i;
+
+ if (!ppgtt)
+ return;
+
+ if (ppgtt->pt_dma_addr) {
+ for (i = 0; i < ppgtt->num_pd_entries; i++)
+ pci_unmap_page(dev->pdev, ppgtt->pt_dma_addr[i],
+ 4096, PCI_DMA_BIDIRECTIONAL);
+ }
+
+ kfree(ppgtt->pt_dma_addr);
+ for (i = 0; i < ppgtt->num_pd_entries; i++)
+ __free_page(ppgtt->pt_pages[i]);
+ kfree(ppgtt->pt_pages);
+ kfree(ppgtt);
+}
+
/* XXX kill agp_type! */
static unsigned int cache_level_to_agp_type(struct drm_device *dev,
enum i915_cache_level cache_level)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index e810723..e9f5dc8 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -92,6 +92,24 @@
#define GEN6_GRDOM_MEDIA (1 << 2)
#define GEN6_GRDOM_BLT (1 << 3)
+/* PPGTT stuff */
+#define GEN6_GTT_ADDR_ENCODE(addr) ((addr) | (((addr) >> 28) & 0xff0))
+
+#define GEN6_PDE_VALID (1 << 0)
+#define GEN6_PDE_LARGE_PAGE (2 << 0) /* use 32kb pages */
+/* gen6+ has bit 11-4 for physical addr bit 39-32 */
+#define GEN6_PDE_ADDR_ENCODE(addr) GEN6_GTT_ADDR_ENCODE(addr)
+
+#define GEN6_PTE_VALID (1 << 0)
+#define GEN6_PTE_UNCACHED (1 << 1)
+#define GEN6_PTE_CACHE_LLC (2 << 1)
+#define GEN6_PTE_CACHE_LLC_MLC (3 << 1)
+#define GEN6_PTE_CACHE_BITS (3 << 1)
+#define GEN6_PTE_GFDT (1 << 3)
+#define GEN6_PTE_ADDR_ENCODE(addr) GEN6_GTT_ADDR_ENCODE(addr)
+
+#define GEN6_PTES_PER_PD 1024
+
/* VGA stuff */
#define VGA_ST01_MDA 0x3ba
--
1.7.7.3
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