From: Michal Wajdeczko michal.wajdeczko@intel.com
Future GuC will require CTB buffers sizes to be multiple of 4K. Make these changes now as this shouldn't impact us too much.
Signed-off-by: Michal Wajdeczko michal.wajdeczko@intel.com Signed-off-by: Matthew Brost matthew.brost@intel.com Reviewed-by: Matthew Brost matthew.brost@intel.com Cc: John Harrison john.c.harrison@intel.com --- drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c | 60 ++++++++++++----------- 1 file changed, 32 insertions(+), 28 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c index 6864819b75a9..916c2b80c841 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c @@ -38,6 +38,32 @@ static inline struct drm_device *ct_to_drm(struct intel_guc_ct *ct) #define CT_PROBE_ERROR(_ct, _fmt, ...) \ i915_probe_error(ct_to_i915(ct), "CT: " _fmt, ##__VA_ARGS__)
+/** + * DOC: CTB Blob + * + * We allocate single blob to hold both CTB descriptors and buffers: + * + * +--------+-----------------------------------------------+------+ + * | offset | contents | size | + * +========+===============================================+======+ + * | 0x0000 | H2G `CTB Descriptor`_ (send) | | + * +--------+-----------------------------------------------+ 4K | + * | 0x0800 | G2H `CTB Descriptor`_ (recv) | | + * +--------+-----------------------------------------------+------+ + * | 0x1000 | H2G `CT Buffer`_ (send) | n*4K | + * | | | | + * +--------+-----------------------------------------------+------+ + * | 0x1000 | G2H `CT Buffer`_ (recv) | m*4K | + * | + n*4K | | | + * +--------+-----------------------------------------------+------+ + * + * Size of each `CT Buffer`_ must be multiple of 4K. + * As we don't expect too many messages, for now use minimum sizes. + */ +#define CTB_DESC_SIZE ALIGN(sizeof(struct guc_ct_buffer_desc), SZ_2K) +#define CTB_H2G_BUFFER_SIZE (SZ_4K) +#define CTB_G2H_BUFFER_SIZE (SZ_4K) + struct ct_request { struct list_head link; u32 fence; @@ -175,29 +201,7 @@ int intel_guc_ct_init(struct intel_guc_ct *ct)
GEM_BUG_ON(ct->vma);
- /* We allocate 1 page to hold both descriptors and both buffers. - * ___________..................... - * |desc (SEND)| : - * |___________| PAGE/4 - * :___________....................: - * |desc (RECV)| : - * |___________| PAGE/4 - * :_______________________________: - * |cmds (SEND) | - * | PAGE/4 - * |_______________________________| - * |cmds (RECV) | - * | PAGE/4 - * |_______________________________| - * - * Each message can use a maximum of 32 dwords and we don't expect to - * have more than 1 in flight at any time, so we have enough space. - * Some logic further ahead will rely on the fact that there is only 1 - * page and that it is always mapped, so if the size is changed the - * other code will need updating as well. - */ - - blob_size = PAGE_SIZE; + blob_size = 2 * CTB_DESC_SIZE + CTB_H2G_BUFFER_SIZE + CTB_G2H_BUFFER_SIZE; err = intel_guc_allocate_and_map_vma(guc, blob_size, &ct->vma, &blob); if (unlikely(err)) { CT_PROBE_ERROR(ct, "Failed to allocate %u for CTB data (%pe)\n", @@ -209,17 +213,17 @@ int intel_guc_ct_init(struct intel_guc_ct *ct)
/* store pointers to desc and cmds for send ctb */ desc = blob; - cmds = blob + PAGE_SIZE / 2; - cmds_size = PAGE_SIZE / 4; + cmds = blob + 2 * CTB_DESC_SIZE; + cmds_size = CTB_H2G_BUFFER_SIZE; CT_DEBUG(ct, "%s desc %#lx cmds %#lx size %u\n", "send", ptrdiff(desc, blob), ptrdiff(cmds, blob), cmds_size);
guc_ct_buffer_init(&ct->ctbs.send, desc, cmds, cmds_size);
/* store pointers to desc and cmds for recv ctb */ - desc = blob + PAGE_SIZE / 4; - cmds = blob + PAGE_SIZE / 4 + PAGE_SIZE / 2; - cmds_size = PAGE_SIZE / 4; + desc = blob + CTB_DESC_SIZE; + cmds = blob + 2 * CTB_DESC_SIZE + CTB_H2G_BUFFER_SIZE; + cmds_size = CTB_G2H_BUFFER_SIZE; CT_DEBUG(ct, "%s desc %#lx cmds %#lx size %u\n", "recv", ptrdiff(desc, blob), ptrdiff(cmds, blob), cmds_size);