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drm/i915: Add PTE encoding function to the gtt/ppgtt vtables.

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Sandybridge/Ivybridge, Bay Trail, and Haswell all have slightly
different page table entry formats.  Rather than polluting one function
with generation checks, simply use a function pointer and set up the
correct PTE encoding function at startup.

v2: Move the gen6_gtt_pte_t typedef to i915_drv.h so that the function
    pointers and implementations have identical signatures.  Also remove
    inline keyword on gen6_pte_encode.  Both suggested by Jani Nikula.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jani Nikula <jani.nikula@linux.intel.com>
Tested-by: Daniel Leung <daniel.leung@linux.intel.com> [v1]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Kenneth Graunke 2013-04-22 00:53:49 -07:00 committed by Daniel Vetter
parent 80ad9206c0
commit 2d04befb94
2 changed files with 24 additions and 14 deletions
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8
drivers/gpu/drm/i915/i915_drv.h
View File

@ -395,6 +395,8 @@ enum i915_cache_level {
I915_CACHE_LLC_MLC, /* gen6+, in docs at least! */
};
typedef uint32_t gen6_gtt_pte_t;
/* The Graphics Translation Table is the way in which GEN hardware translates a
* Graphics Virtual Address into a Physical Address. In addition to the normal
* collateral associated with any va->pa translations GEN hardware also has a
@ -430,6 +432,9 @@ struct i915_gtt {
struct sg_table *st,
unsigned int pg_start,
enum i915_cache_level cache_level);
gen6_gtt_pte_t (*pte_encode)(struct drm_device *dev,
dma_addr_t addr,
enum i915_cache_level level);
};
#define gtt_total_entries(gtt) ((gtt).total >> PAGE_SHIFT)
@ -451,6 +456,9 @@ struct i915_hw_ppgtt {
struct sg_table *st,
unsigned int pg_start,
enum i915_cache_level cache_level);
gen6_gtt_pte_t (*pte_encode)(struct drm_device *dev,
dma_addr_t addr,
enum i915_cache_level level);
int (*enable)(struct drm_device *dev);
void (*cleanup)(struct i915_hw_ppgtt *ppgtt);
};

30
drivers/gpu/drm/i915/i915_gem_gtt.c
View File

@ -28,8 +28,6 @@
#include "i915_trace.h"
#include "intel_drv.h"
typedef uint32_t gen6_gtt_pte_t;
/* PPGTT stuff */
#define GEN6_GTT_ADDR_ENCODE(addr) ((addr) | (((addr) >> 28) & 0xff0))
@ -44,9 +42,9 @@ typedef uint32_t gen6_gtt_pte_t;
#define GEN6_PTE_CACHE_LLC_MLC (3 << 1)
#define GEN6_PTE_ADDR_ENCODE(addr) GEN6_GTT_ADDR_ENCODE(addr)
static inline gen6_gtt_pte_t gen6_pte_encode(struct drm_device *dev,
dma_addr_t addr,
enum i915_cache_level level)
static gen6_gtt_pte_t gen6_pte_encode(struct drm_device *dev,
dma_addr_t addr,
enum i915_cache_level level)
{
gen6_gtt_pte_t pte = GEN6_PTE_VALID;
pte |= GEN6_PTE_ADDR_ENCODE(addr);
@ -154,9 +152,9 @@ static void gen6_ppgtt_clear_range(struct i915_hw_ppgtt *ppgtt,
unsigned first_pte = first_entry % I915_PPGTT_PT_ENTRIES;
unsigned last_pte, i;
scratch_pte = gen6_pte_encode(ppgtt->dev,
ppgtt->scratch_page_dma_addr,
I915_CACHE_LLC);
scratch_pte = ppgtt->pte_encode(ppgtt->dev,
ppgtt->scratch_page_dma_addr,
I915_CACHE_LLC);
while (num_entries) {
last_pte = first_pte + num_entries;
@ -191,8 +189,8 @@ static void gen6_ppgtt_insert_entries(struct i915_hw_ppgtt *ppgtt,
dma_addr_t page_addr;
page_addr = sg_page_iter_dma_address(&sg_iter);
pt_vaddr[act_pte] = gen6_pte_encode(ppgtt->dev, page_addr,
cache_level);
pt_vaddr[act_pte] = ppgtt->pte_encode(ppgtt->dev, page_addr,
cache_level);
if (++act_pte == I915_PPGTT_PT_ENTRIES) {
kunmap_atomic(pt_vaddr);
act_pt++;
@ -236,6 +234,7 @@ static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
first_pd_entry_in_global_pt =
gtt_total_entries(dev_priv->gtt) - I915_PPGTT_PD_ENTRIES;
ppgtt->pte_encode = gen6_pte_encode;
ppgtt->num_pd_entries = I915_PPGTT_PD_ENTRIES;
ppgtt->enable = gen6_ppgtt_enable;
ppgtt->clear_range = gen6_ppgtt_clear_range;
@ -438,7 +437,8 @@ static void gen6_ggtt_insert_entries(struct drm_device *dev,
for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) {
addr = sg_page_iter_dma_address(&sg_iter);
iowrite32(gen6_pte_encode(dev, addr, level), &gtt_entries[i]);
iowrite32(dev_priv->gtt.pte_encode(dev, addr, level),
&gtt_entries[i]);
i++;
}
@ -450,7 +450,7 @@ static void gen6_ggtt_insert_entries(struct drm_device *dev,
*/
if (i != 0)
WARN_ON(readl(&gtt_entries[i-1])
!= gen6_pte_encode(dev, addr, level));
!= dev_priv->gtt.pte_encode(dev, addr, level));
/* This next bit makes the above posting read even more important. We
* want to flush the TLBs only after we're certain all the PTE updates
@ -475,8 +475,9 @@ static void gen6_ggtt_clear_range(struct drm_device *dev,
first_entry, num_entries, max_entries))
num_entries = max_entries;
scratch_pte = gen6_pte_encode(dev, dev_priv->gtt.scratch_page_dma,
I915_CACHE_LLC);
scratch_pte = dev_priv->gtt.pte_encode(dev,
dev_priv->gtt.scratch_page_dma,
I915_CACHE_LLC);
for (i = 0; i < num_entries; i++)
iowrite32(scratch_pte, &gtt_base[i]);
readl(gtt_base);
@ -823,6 +824,7 @@ int i915_gem_gtt_init(struct drm_device *dev)
} else {
dev_priv->gtt.gtt_probe = gen6_gmch_probe;
dev_priv->gtt.gtt_remove = gen6_gmch_remove;
dev_priv->gtt.pte_encode = gen6_pte_encode;
}
ret = dev_priv->gtt.gtt_probe(dev, &dev_priv->gtt.total,