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drm/i915/cmdparser: Use binary search for faster register lookup 

A significant proportion of the cmdparsing time for some batches is the
cost to find the register in the mmiotable. We ensure that those tables
are in ascending order such that we could do a binary search if it was
ever merited. It is.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-38-chris@chris-wilson.co.uk
hifive-unleashed-5.1
Chris Wilson 2016-08-18 17:17:17 +01:00
parent ea884f09e5
commit 76ff480ec9
1 changed files with 20 additions and 22 deletions
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42
drivers/gpu/drm/i915/i915_cmd_parser.c
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@ -921,36 +921,37 @@ find_cmd(struct intel_engine_cs *engine,
}
static const struct drm_i915_reg_descriptor *
find_reg(const struct drm_i915_reg_descriptor *table,
int count, u32 addr)
__find_reg(const struct drm_i915_reg_descriptor *table, int count, u32 addr)
{
int i;
for (i = 0; i < count; i++) {
if (i915_mmio_reg_offset(table[i].addr) == addr)
return &table[i];
int start = 0, end = count;
while (start < end) {
int mid = start + (end - start) / 2;
int ret = addr - i915_mmio_reg_offset(table[mid].addr);
if (ret < 0)
end = mid;
else if (ret > 0)
start = mid + 1;
else
return &table[mid];
}
return NULL;
}
static const struct drm_i915_reg_descriptor *
find_reg_in_tables(const struct drm_i915_reg_table *tables,
int count, bool is_master, u32 addr)
find_reg(const struct intel_engine_cs *engine, bool is_master, u32 addr)
{
int i;
const struct drm_i915_reg_table *table;
const struct drm_i915_reg_descriptor *reg;
const struct drm_i915_reg_table *table = engine->reg_tables;
int count = engine->reg_table_count;
for (i = 0; i < count; i++) {
table = &tables[i];
do {
if (!table->master || is_master) {
reg = find_reg(table->regs, table->num_regs,
addr);
const struct drm_i915_reg_descriptor *reg;
reg = __find_reg(table->regs, table->num_regs, addr);
if (reg != NULL)
return reg;
}
}
} while (table++, --count);
return NULL;
}
@ -1073,10 +1074,7 @@ static bool check_cmd(const struct intel_engine_cs *engine,
offset += step) {
const u32 reg_addr = cmd[offset] & desc->reg.mask;
const struct drm_i915_reg_descriptor *reg =
find_reg_in_tables(engine->reg_tables,
engine->reg_table_count,
is_master,
reg_addr);
find_reg(engine, is_master, reg_addr);
if (!reg) {
DRM_DEBUG_DRIVER("CMD: Rejected register 0x%08X in command: 0x%08X (exec_id=%d)\n",