Re: [igt-dev] [PATCH i-g-t v2] i915/gem_mocs_settings: Add mocs table for icelake

["Kumar Valsan, Prathap" <prathap.kumar.valsan@intel.com>]

On Fri, Feb 22, 2019 at 03:21:18PM +0000, Chris Wilson wrote:
> Quoting Lis, Tomasz (2019-02-22 15:17:34)
> > 
> > 
> > On 2019-02-22 15:17, Prathap Kumar Valsan wrote:
> > > From: "Kumar Valsan, Prathap" <prathap.kumar.valsan@intel.com>
> > >
> > > This patch adds mocs table for icelake with expected L3 and eDRAM
> > > control values.
> > >
> > > Signed-off-by: Kumar Valsan, Prathap <prathap.kumar.valsan@intel.com>
> > > ---
> > > Changes in v2:
> > > - Cleaned up the code based on review comments from Lucas and Chris
> > >   tests/i915/gem_mocs_settings.c | 96 ++++++++++++++++++++++++++--------
> > >   1 file changed, 73 insertions(+), 23 deletions(-)
> > >
> > > diff --git a/tests/i915/gem_mocs_settings.c b/tests/i915/gem_mocs_settings.c
> > > index 5b3b6bc1..6d111076 100644
> > > --- a/tests/i915/gem_mocs_settings.c
> > > +++ b/tests/i915/gem_mocs_settings.c
> > > @@ -33,6 +33,9 @@
> > >   #include "igt_sysfs.h"
> > >   
> > >   #define MAX_NUMBER_MOCS_REGISTERS   (64)
> > > +#define GEN9_NUM_MOCS_ENTRIES   62  /* 62 out of 64 - 63 & 64 are reserved. */
> > > +#define GEN11_NUM_MOCS_ENTRIES  64  /* 63-64 are reserved, but configured. */
> > > +
> > >   enum {
> > >       NONE,
> > >       RESET,
> > > @@ -72,36 +75,66 @@ struct mocs_table {
> > >       const struct mocs_entry *table;
> > >   };
> > >   
> > > +static const struct mocs_entry icelake_mocs_pte = {0x00000004, 0x0030};
> > > +static const struct mocs_entry mocs_pte = {0x00000038, 0x0030};
> > > +
> > >   /* The first entries in the MOCS tables are defined by uABI */
> > > -static const struct mocs_entry skylake_mocs_table[] = {
> > > -     { 0x00000009, 0x0010 },
> > > -     { 0x00000038, 0x0030 },
> > > -     { 0x0000003b, 0x0030 },
> > > +static const struct mocs_entry icelake_mocs_table[GEN11_NUM_MOCS_ENTRIES] = {
> > > +     [0 ... GEN11_NUM_MOCS_ENTRIES - 1] = icelake_mocs_pte,
> > > +     [0]  = { 0x00000005, 0x0010},
> > > +     [1]  = { 0x00000004, 0x0030},
> > > +     [2]  = { 0x00000037, 0x0030},
> > > +     [3]  = { 0x00000005, 0x0010},
> > > +     [4]  = { 0x00000005, 0x0030},
> > > +     [5]  = { 0x00000037, 0x0010},
> > > +     [6]  = { 0x00000017, 0x0010},
> > > +     [7]  = { 0x00000017, 0x0030},
> > > +     [8]  = { 0x00000027, 0x0010},
> > > +     [9]  = { 0x00000027, 0x0030},
> > > +     [10] = { 0x00000077, 0x0010},
> > > +     [11] = { 0x00000077, 0x0030},
> > > +     [12] = { 0x00000057, 0x0010},
> > > +     [13] = { 0x00000057, 0x0030},
> > > +     [14] = { 0x00000067, 0x0010},
> > > +     [15] = { 0x00000067, 0x0030},
> > > +     [18] = { 0x00060037, 0x0030},
> > > +     [19] = { 0x00000737, 0x0030},
> > > +     [20] = { 0x00000337, 0x0030},
> > > +     [21] = { 0x00000137, 0x0030},
> > > +     [22] = { 0x000003b7, 0x0030},
> > > +     [23] = { 0x000007b7, 0x0030},
> > > +     [62] = { 0x00000037, 0x0010},
> > > +     [63] = { 0x00000037, 0x0010},
> > > +};
> > > +
> > > +static const struct mocs_entry dirty_icelake_mocs_table[GEN11_NUM_MOCS_ENTRIES] = {
> > > +     [0 ... GEN11_NUM_MOCS_ENTRIES - 1] = { 0x0007FFFF, 0x003F },
> > >   };
> > >   
> > > -static const struct mocs_entry dirty_skylake_mocs_table[] = {
> > > -     { 0x00003FFF, 0x003F }, /* no snoop bit */
> > > -     { 0x00003FFF, 0x003F },
> > > -     { 0x00003FFF, 0x003F },
> > > +static const struct mocs_entry skylake_mocs_table[GEN9_NUM_MOCS_ENTRIES] = {
> > > +     [0 ... GEN9_NUM_MOCS_ENTRIES - 1] = mocs_pte,
> > > +     [0] = { 0x00000009, 0x0010},
> > > +     [1] = { 0x00000038, 0x0030},
> > > +     [2] = { 0x0000003b, 0x0030},
> > >   };
> > >   
> > > -static const struct mocs_entry broxton_mocs_table[] = {
> > > -     { 0x00000009, 0x0010 },
> > > -     { 0x00000038, 0x0030 },
> > > -     { 0x00000039, 0x0030 },
> > > +static const struct mocs_entry dirty_skylake_mocs_table[GEN9_NUM_MOCS_ENTRIES] = {
> > > +     [0 ... GEN9_NUM_MOCS_ENTRIES - 1] = { 0x00003FFF, 0x003F },
> > >   };
> > >   
> > > -static const struct mocs_entry dirty_broxton_mocs_table[] = {
> > > -     { 0x00007FFF, 0x003F },
> > > -     { 0x00007FFF, 0x003F },
> > > -     { 0x00007FFF, 0x003F },
> > > +static const struct mocs_entry broxton_mocs_table[GEN9_NUM_MOCS_ENTRIES] = {
> > > +     [0 ... GEN9_NUM_MOCS_ENTRIES - 1] = mocs_pte,
> > > +     [0] = { 0x00000009, 0x0010},
> > > +     [1] = { 0x00000038, 0x0030},
> > > +     [2] = { 0x00000039, 0x0030},
> > >   };
> > >   
> > > -static const uint32_t write_values[] = {
> > > -     0xFFFFFFFF,
> > > -     0xFFFFFFFF,
> > > -     0xFFFFFFFF,
> > > -     0xFFFFFFFF
> > > +static const struct mocs_entry dirty_broxton_mocs_table[GEN9_NUM_MOCS_ENTRIES] = {
> > > +     [0 ... GEN9_NUM_MOCS_ENTRIES - 1] = { 0x00007FFF, 0x003F },
> > > +};
> > > +
> > > +static const uint32_t write_values[MAX_NUMBER_MOCS_REGISTERS] = {
> > > +     [0 ... MAX_NUMBER_MOCS_REGISTERS - 1] = 0xFFFFFFFF,
> > >   };
> > >   
> > >   static bool get_mocs_settings(int fd, struct mocs_table *table, bool dirty)
> > > @@ -127,6 +160,15 @@ static bool get_mocs_settings(int fd, struct mocs_table *table, bool dirty)
> > >                       table->table = broxton_mocs_table;
> > >               }
> > >               result = true;
> > > +     } else if (IS_ICELAKE(devid)) {
> > > +             if (dirty) {
> > > +                     table->size  = ARRAY_SIZE(dirty_icelake_mocs_table);
> > > +                     table->table = dirty_icelake_mocs_table;
> > > +             } else {
> > > +                     table->size  = ARRAY_SIZE(icelake_mocs_table);
> > > +                     table->table = icelake_mocs_table;
> > > +             }
> > > +             result = true;
> > >       }
> > >   
> > >       return result;
> > > @@ -374,13 +416,21 @@ static void check_mocs_values(int fd, unsigned engine, uint32_t ctx_id, bool dir
> > >   
> > >   static void write_dirty_mocs(int fd, unsigned engine, uint32_t ctx_id)
> > >   {
> > > +     uint32_t devid = intel_get_drm_devid(fd);
> > > +     int num_of_mocs_entries;
> > > +
> > > +     if (IS_ICELAKE(devid))
> > > +             num_of_mocs_entries = GEN11_NUM_MOCS_ENTRIES;
> > > +     else
> > > +             num_of_mocs_entries = GEN9_NUM_MOCS_ENTRIES;
> > > +
> > >       write_registers(fd, ctx_id, get_engine_base(engine),
> > > -                     write_values, ARRAY_SIZE(write_values),
> > > +                     write_values, num_of_mocs_entries,
> > >                       engine);
> > >   
> > >       if (engine == I915_EXEC_RENDER)
> > >               write_registers(fd, ctx_id, GEN9_LNCFCMOCS0,
> > > -                             write_values, ARRAY_SIZE(write_values),
> > > +                             write_values, num_of_mocs_entries/2,
> > >                               engine);
> > >   }
> > >   
> > The "-dirty" subcase of the test doesn't seem suitable to current hardware..
> > 
> > The table is now global. So writing it from one context and checking if 
> > another context is unaffected is bound to fail.
As you pointed out On Gen11, "-dirty" subcases are failing.
Test is not able to write to registers.
> 
> We shouldn't be able to do nonpriv writes to it then. Hopefully those
> writes are already being dropped?
So probably on latest hardware, test should still try to write and call
it pass if the dirty values are not being written?
> -Chris
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