Re: [Intel-gfx] [PATCH] drm/i915: Use helper func to find out map type

[Andrzej Hajda <andrzej.hajda@intel.com>]

On 16.12.2022 16:43, Matthew Auld wrote:
> On 16/12/2022 15:27, Nirmoy Das wrote:
>> Use i915_coherent_map_type() function to find out
>> map_type of the shmem obj.
>>
>> Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
>> ---
>>   drivers/gpu/drm/i915/gt/shmem_utils.c | 7 +++++--
>>   1 file changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/gt/shmem_utils.c 
>> b/drivers/gpu/drm/i915/gt/shmem_utils.c
>> index 402f085f3a02..e1a69803624f 100644
>> --- a/drivers/gpu/drm/i915/gt/shmem_utils.c
>> +++ b/drivers/gpu/drm/i915/gt/shmem_utils.c
>> @@ -8,6 +8,7 @@
>>   #include <linux/pagemap.h>
>>   #include <linux/shmem_fs.h>
>> +#include "i915_drv.h"
>>   #include "gem/i915_gem_object.h"
>>   #include "gem/i915_gem_lmem.h"
>>   #include "shmem_utils.h"
>> @@ -32,6 +33,8 @@ struct file *shmem_create_from_data(const char 
>> *name, void *data, size_t len)
>>   struct file *shmem_create_from_object(struct drm_i915_gem_object *obj)
>>   {
>> +    struct drm_i915_private *i915 = to_i915(obj->base.dev);
>> +    enum i915_map_type map_type;
>>       struct file *file;
>>       void *ptr;
>> @@ -41,8 +44,8 @@ struct file *shmem_create_from_object(struct 
>> drm_i915_gem_object *obj)
>>           return file;
>>       }
>> -    ptr = i915_gem_object_pin_map_unlocked(obj, 
>> i915_gem_object_is_lmem(obj) ?
>> -                        I915_MAP_WC : I915_MAP_WB);
>> +    map_type = i915_coherent_map_type(i915, obj, false);
> 
> This will now use wc on non-llc.

i915_coherent_map_type(i915, obj, true) should do the trick.

Regards
Andrzej

> 
>> +    ptr = i915_gem_object_pin_map_unlocked(obj, map_type);
>>       if (IS_ERR(ptr))
>>           return ERR_CAST(ptr);