Commit 24b41527 authored by Jordan Justen's avatar Jordan Justen

intel/vulkan: Hard code CS scratch_ids_per_subslice for Cherryview

Ken suggested that we might be underallocating scratch space on HD
400. Allocating scratch space as though there was actually 8 EUs
seems to help with a GPU hang seen on synmark CSDof.

Cc: <mesa-stable@lists.freedesktop.org>
Signed-off-by: Jordan Justen's avatarJordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke's avatarKenneth Graunke <kenneth@whitecape.org>
parent 06e3bd02
......@@ -1097,24 +1097,35 @@ anv_scratch_pool_alloc(struct anv_device *device, struct anv_scratch_pool *pool,
&device->instance->physicalDevice;
const struct gen_device_info *devinfo = &physical_device->info;
/* WaCSScratchSize:hsw
*
* Haswell's scratch space address calculation appears to be sparse
* rather than tightly packed. The Thread ID has bits indicating which
* subslice, EU within a subslice, and thread within an EU it is.
* There's a maximum of two slices and two subslices, so these can be
* stored with a single bit. Even though there are only 10 EUs per
* subslice, this is stored in 4 bits, so there's an effective maximum
* value of 16 EUs. Similarly, although there are only 7 threads per EU,
* this is stored in a 3 bit number, giving an effective maximum value
* of 8 threads per EU.
*
* This means that we need to use 16 * 8 instead of 10 * 7 for the
* number of threads per subslice.
*/
const unsigned subslices = MAX2(physical_device->subslice_total, 1);
const unsigned scratch_ids_per_subslice =
device->info.is_haswell ? 16 * 8 : devinfo->max_cs_threads;
unsigned scratch_ids_per_subslice;
if (devinfo->is_haswell) {
/* WaCSScratchSize:hsw
*
* Haswell's scratch space address calculation appears to be sparse
* rather than tightly packed. The Thread ID has bits indicating
* which subslice, EU within a subslice, and thread within an EU it
* is. There's a maximum of two slices and two subslices, so these
* can be stored with a single bit. Even though there are only 10 EUs
* per subslice, this is stored in 4 bits, so there's an effective
* maximum value of 16 EUs. Similarly, although there are only 7
* threads per EU, this is stored in a 3 bit number, giving an
* effective maximum value of 8 threads per EU.
*
* This means that we need to use 16 * 8 instead of 10 * 7 for the
* number of threads per subslice.
*/
scratch_ids_per_subslice = 16 * 8;
} else if (devinfo->is_cherryview) {
/* Cherryview devices have either 6 or 8 EUs per subslice, and each EU
* has 7 threads. The 6 EU devices appear to calculate thread IDs as if
* it had 8 EUs.
*/
scratch_ids_per_subslice = 8 * 7;
} else {
scratch_ids_per_subslice = devinfo->max_cs_threads;
}
uint32_t max_threads[] = {
[MESA_SHADER_VERTEX] = devinfo->max_vs_threads,
......
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