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drm/i915: Add macro for SSEU stride calculation

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Subslice stride and EU stride are calculated multiple times in
i915_query. Move this calculation to a macro to reduce code duplication.

v2: update headers in intel_sseu.h
v3: use GEN_SSEU_STRIDE for stride calculations in intel_sseu.h
    apply s/bits/max_entries/ to GEN_SSEU_STRIDE parameter

Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Stuart Summers <stuart.summers@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190524154022.13575-3-stuart.summers@intel.com
This commit is contained in:
Stuart Summers 2019-05-24 08:40:19 -07:00 committed by Manasi Navare
parent bd41ca49a2
commit 135a63b682
3 changed files with 13 additions and 15 deletions
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2
drivers/gpu/drm/i915/gt/intel_sseu.h
View File

@ -8,11 +8,13 @@
#define __INTEL_SSEU_H__
#include <linux/types.h>
#include <linux/kernel.h>
struct drm_i915_private;
#define GEN_MAX_SLICES (6) /* CNL upper bound */
#define GEN_MAX_SUBSLICES (8) /* ICL upper bound */
#define GEN_SSEU_STRIDE(max_entries) DIV_ROUND_UP(max_entries, BITS_PER_BYTE)
struct sseu_dev_info {
u8 slice_mask;

17
drivers/gpu/drm/i915/i915_query.c
View File

@ -37,6 +37,8 @@ static int query_topology_info(struct drm_i915_private *dev_priv,
const struct sseu_dev_info *sseu = &RUNTIME_INFO(dev_priv)->sseu;
struct drm_i915_query_topology_info topo;
u32 slice_length, subslice_length, eu_length, total_length;
u8 subslice_stride = GEN_SSEU_STRIDE(sseu->max_subslices);
u8 eu_stride = GEN_SSEU_STRIDE(sseu->max_eus_per_subslice);
int ret;
if (query_item->flags != 0)
@ -48,12 +50,10 @@ static int query_topology_info(struct drm_i915_private *dev_priv,
BUILD_BUG_ON(sizeof(u8) != sizeof(sseu->slice_mask));
slice_length = sizeof(sseu->slice_mask);
subslice_length = sseu->max_slices *
DIV_ROUND_UP(sseu->max_subslices, BITS_PER_BYTE);
eu_length = sseu->max_slices * sseu->max_subslices *
DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE);
total_length = sizeof(topo) + slice_length + subslice_length + eu_length;
subslice_length = sseu->max_slices * subslice_stride;
eu_length = sseu->max_slices * sseu->max_subslices * eu_stride;
total_length = sizeof(topo) + slice_length + subslice_length +
eu_length;
ret = copy_query_item(&topo, sizeof(topo), total_length,
query_item);
@ -69,10 +69,9 @@ static int query_topology_info(struct drm_i915_private *dev_priv,
topo.max_eus_per_subslice = sseu->max_eus_per_subslice;
topo.subslice_offset = slice_length;
topo.subslice_stride = DIV_ROUND_UP(sseu->max_subslices, BITS_PER_BYTE);
topo.subslice_stride = subslice_stride;
topo.eu_offset = slice_length + subslice_length;
topo.eu_stride =
DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE);
topo.eu_stride = eu_stride;
if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr),
&topo, sizeof(topo)))

9
drivers/gpu/drm/i915/intel_device_info.h
View File

@ -231,8 +231,7 @@ static inline unsigned int sseu_subslice_total(const struct sseu_dev_info *sseu)
static inline int sseu_eu_idx(const struct sseu_dev_info *sseu,
int slice, int subslice)
{
int subslice_stride = DIV_ROUND_UP(sseu->max_eus_per_subslice,
BITS_PER_BYTE);
int subslice_stride = GEN_SSEU_STRIDE(sseu->max_eus_per_subslice);
int slice_stride = sseu->max_subslices * subslice_stride;
return slice * slice_stride + subslice * subslice_stride;
@ -244,8 +243,7 @@ static inline u16 sseu_get_eus(const struct sseu_dev_info *sseu,
int i, offset = sseu_eu_idx(sseu, slice, subslice);
u16 eu_mask = 0;
for (i = 0;
i < DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE); i++) {
for (i = 0; i < GEN_SSEU_STRIDE(sseu->max_eus_per_subslice); i++) {
eu_mask |= ((u16) sseu->eu_mask[offset + i]) <<
(i * BITS_PER_BYTE);
}
@ -258,8 +256,7 @@ static inline void sseu_set_eus(struct sseu_dev_info *sseu,
{
int i, offset = sseu_eu_idx(sseu, slice, subslice);
for (i = 0;
i < DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE); i++) {
for (i = 0; i < GEN_SSEU_STRIDE(sseu->max_eus_per_subslice); i++) {
sseu->eu_mask[offset + i] =
(eu_mask >> (BITS_PER_BYTE * i)) & 0xff;
}