[src/trunk]: src/sys/external/bsd/drm2/dist/drm/i915 Implement a bus_dma vers...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/4febbb0ac977
branches:  trunk
changeset: 834999:4febbb0ac977
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Mon Aug 27 07:16:31 2018 +0000

description:
Implement a bus_dma version of Linux sg_pcopy_from_buffer.

diffstat:

 sys/external/bsd/drm2/dist/drm/i915/i915_guc_submission.c |  118 +++++++++++++-
 1 files changed, 116 insertions(+), 2 deletions(-)

diffs (178 lines):

diff -r e5e4a5912c64 -r 4febbb0ac977 sys/external/bsd/drm2/dist/drm/i915/i915_guc_submission.c
--- a/sys/external/bsd/drm2/dist/drm/i915/i915_guc_submission.c Mon Aug 27 07:16:20 2018 +0000
+++ b/sys/external/bsd/drm2/dist/drm/i915/i915_guc_submission.c Mon Aug 27 07:16:31 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: i915_guc_submission.c,v 1.5 2018/08/27 07:16:20 riastradh Exp $        */
+/*     $NetBSD: i915_guc_submission.c,v 1.6 2018/08/27 07:16:31 riastradh Exp $        */
 
 /*
  * Copyright © 2014 Intel Corporation
@@ -24,7 +24,7 @@
  *
  */
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: i915_guc_submission.c,v 1.5 2018/08/27 07:16:20 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: i915_guc_submission.c,v 1.6 2018/08/27 07:16:31 riastradh Exp $");
 
 #include <linux/bitmap.h>
 #include <linux/firmware.h>
@@ -381,6 +381,90 @@
        kunmap_atomic(base);
 }
 
+#ifdef __NetBSD__
+/*
+ * bus_dmamem_move_atomic(dmat, seg, nseg, buf, nbytes, rw)
+ *
+ *     Transfer nbytes of data between the bus_dma segments seg[0],
+ *     seg[1], ..., seg[nseg-1] and buf, in the direction specified by
+ *     rw: reading from or writing to the DMA segments.
+ *
+ *     Cannot fail.
+ */
+static void
+bus_dmamem_move(bus_dma_tag_t dmat, bus_dma_segment_t *seg, int nseg,
+    bus_size_t skip, void *buf, size_t nbytes, enum uio_rw rw)
+{
+       char *ptr = buf;
+       void *kva;
+       int i;
+
+       /* Find the first segment that we need to copy from.  */
+       for (i = 0; skip < seg[i].ds_len; skip -= seg[i].ds_len, i++)
+               KASSERT(i < nseg);
+
+       /* Copy as much as we requested from the segments.  */
+       do {
+               paddr_t pa;
+               bus_size_t seglen;
+
+               KASSERT(i < nseg);
+               KASSERT(skip < seg[i].ds_len);
+               pa = seg[i].ds_addr;
+               seglen = MIN(seg[i].ds_len, nbytes);
+               i++;
+
+               while (seglen) {
+                       struct vm_page *vm_page = PHYS_TO_VM_PAGE(pa);
+                       struct page *page = container_of(vm_page, struct page,
+                           p_vmp);
+                       size_t copy = MIN(PAGE_SIZE - skip, seglen);
+                       const char *src;
+                       char *dst;
+
+                       kva = kmap_atomic(page);
+                       switch (rw) {
+                       case UIO_READ:
+                               src = kva;
+                               src += skip;
+                               dst = ptr;
+                       case UIO_WRITE:
+                               src = ptr;
+                               dst = kva;
+                               dst += skip;
+                       }
+                       memcpy(dst, src, copy);
+                       kunmap_atomic(kva);
+
+                       pa += PAGE_SIZE;
+                       seglen -= copy;
+                       ptr += copy;
+                       nbytes -= copy;
+                       skip = 0; /* after the first, we're page-aligned */
+               }
+       } while (nbytes);
+}
+
+static void
+bus_dmamem_write(bus_dma_tag_t dmat, bus_dma_segment_t *seg, int nseg,
+    bus_size_t skip, const void *buf, size_t nbytes)
+{
+
+       bus_dmamem_move(dmat, seg, nseg, skip, __UNCONST(buf), nbytes,
+           UIO_WRITE);
+}
+
+#if 0
+static void
+bus_dmamem_read(bus_dma_tag_t dmat, bus_dma_segment_t *seg, int nseg,
+    bus_size_t skip, void *buf, size_t nbytes)
+{
+
+       bus_dmamem_move(dmat, seg, nseg, skip, buf, nbytes, UIO_READ);
+}
+#endif
+#endif
+
 /*
  * Initialise/clear the context descriptor shared with the GuC firmware.
  *
@@ -394,7 +478,9 @@
 {
        struct intel_context *ctx = client->owner;
        struct guc_context_desc desc;
+#ifndef __NetBSD__
        struct sg_table *sg;
+#endif
        int i;
 
        memset(&desc, 0, sizeof(desc));
@@ -452,8 +538,13 @@
        desc.db_trigger_cpu = 0;
        desc.db_trigger_uk = client->doorbell_offset +
                i915_gem_obj_ggtt_offset(client->client_obj);
+#ifdef __NetBSD__
+       desc.db_trigger_phy = client->doorbell_offset +
+           client->client_obj->igo_dmamap->dm_segs[0].ds_addr;
+#else
        desc.db_trigger_phy = client->doorbell_offset +
                sg_dma_address(client->client_obj->pages->sgl);
+#endif
 
        desc.process_desc = client->proc_desc_offset +
                i915_gem_obj_ggtt_offset(client->client_obj);
@@ -470,14 +561,36 @@
        desc.desc_private = (uintptr_t)client;
 
        /* Pool context is pinned already */
+#ifdef __NetBSD__
+       bus_dma_tag_t dmat = guc->ctx_pool_obj->base.dev->dmat;
+       bus_dma_segment_t *seg = guc->ctx_pool_obj->pages;
+       int nseg = guc->ctx_pool_obj->igo_nsegs;
+       bus_size_t skip = sizeof(desc) * client->ctx_index;
+       size_t nbytes = sizeof(desc);
+
+       bus_dmamem_write(dmat, seg, nseg, skip, &desc, nbytes);
+#else
        sg = guc->ctx_pool_obj->pages;
        sg_pcopy_from_buffer(sg->sgl, sg->nents, &desc, sizeof(desc),
                             sizeof(desc) * client->ctx_index);
+#endif
 }
 
 static void guc_fini_ctx_desc(struct intel_guc *guc,
                              struct i915_guc_client *client)
 {
+#ifdef __NetBSD__
+       struct guc_context_desc desc;
+       bus_dma_tag_t dmat = guc->ctx_pool_obj->base.dev->dmat;
+       bus_dma_segment_t *seg = guc->ctx_pool_obj->pages;
+       int nseg = guc->ctx_pool_obj->igo_nsegs;
+       bus_size_t skip = sizeof(desc) * client->ctx_index;
+       size_t nbytes = sizeof(desc);
+
+       memset(&desc, 0, sizeof(desc));
+
+       bus_dmamem_write(dmat, seg, nseg, skip, &desc, nbytes);
+#else
        struct guc_context_desc desc;
        struct sg_table *sg;
 
@@ -486,6 +599,7 @@
        sg = guc->ctx_pool_obj->pages;
        sg_pcopy_from_buffer(sg->sgl, sg->nents, &desc, sizeof(desc),
                             sizeof(desc) * client->ctx_index);
+#endif
 }
 
 /* Get valid workqueue item and return it back to offset */