/* * Scatter-Gather buffer * * Copyright (c) by Takashi Iwai * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include #include #include #include #include /* table entries are align to 32 */ #define SGBUF_TBL_ALIGN 32 #define sgbuf_align_table(tbl) ALIGN((tbl), SGBUF_TBL_ALIGN) int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab) { struct snd_sg_buf *sgbuf = dmab->private_data; struct snd_dma_buffer tmpb; int i; if (! sgbuf) return -EINVAL; vunmap(dmab->area); dmab->area = NULL; tmpb.dev.type = SNDRV_DMA_TYPE_DEV; tmpb.dev.dev = sgbuf->dev; for (i = 0; i < sgbuf->pages; i++) { if (!(sgbuf->table[i].addr & ~PAGE_MASK)) continue; /* continuous pages */ tmpb.area = sgbuf->table[i].buf; tmpb.addr = sgbuf->table[i].addr & PAGE_MASK; tmpb.bytes = (sgbuf->table[i].addr & ~PAGE_MASK) << PAGE_SHIFT; snd_dma_free_pages(&tmpb); } kfree(sgbuf->table); kfree(sgbuf->page_table); kfree(sgbuf); dmab->private_data = NULL; return 0; } #define MAX_ALLOC_PAGES 32 void *snd_malloc_sgbuf_pages(struct device *device, size_t size, struct snd_dma_buffer *dmab, size_t *res_size) { struct snd_sg_buf *sgbuf; unsigned int i, pages, chunk, maxpages; struct snd_dma_buffer tmpb; struct snd_sg_page *table; struct page **pgtable; dmab->area = NULL; dmab->addr = 0; dmab->private_data = sgbuf = kzalloc(sizeof(*sgbuf), GFP_KERNEL); if (! sgbuf) return NULL; sgbuf->dev = device; pages = snd_sgbuf_aligned_pages(size); sgbuf->tblsize = sgbuf_align_table(pages); table = kcalloc(sgbuf->tblsize, sizeof(*table), GFP_KERNEL); if (!table) goto _failed; sgbuf->table = table; pgtable = kcalloc(sgbuf->tblsize, sizeof(*pgtable), GFP_KERNEL); if (!pgtable) goto _failed; sgbuf->page_table = pgtable; /* allocate pages */ maxpages = MAX_ALLOC_PAGES; while (pages > 0) { chunk = pages; /* don't be too eager to take a huge chunk */ if (chunk > maxpages) chunk = maxpages; chunk <<= PAGE_SHIFT; if (snd_dma_alloc_pages_fallback(SNDRV_DMA_TYPE_DEV, device, chunk, &tmpb) < 0) { if (!sgbuf->pages) goto _failed; if (!res_size) goto _failed; size = sgbuf->pages * PAGE_SIZE; break; } chunk = tmpb.bytes >> PAGE_SHIFT; for (i = 0; i < chunk; i++) { table->buf = tmpb.area; table->addr = tmpb.addr; if (!i) table->addr |= chunk; /* mark head */ table++; *pgtable++ = virt_to_page(tmpb.area); tmpb.area += PAGE_SIZE; tmpb.addr += PAGE_SIZE; } sgbuf->pages += chunk; pages -= chunk; if (chunk < maxpages) maxpages = chunk; } sgbuf->size = size; dmab->area = vmap(sgbuf->page_table, sgbuf->pages, VM_MAP, PAGE_KERNEL); if (! dmab->area) goto _failed; if (res_size) *res_size = sgbuf->size; return dmab->area; _failed: snd_free_sgbuf_pages(dmab); /* free the table */ return NULL; } /* * compute the max chunk size with continuous pages on sg-buffer */ unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, unsigned int ofs, unsigned int size) { struct snd_sg_buf *sg = dmab->private_data; unsigned int start, end, pg; start = ofs >> PAGE_SHIFT; end = (ofs + size - 1) >> PAGE_SHIFT; /* check page continuity */ pg = sg->table[start].addr >> PAGE_SHIFT; for (;;) { start++; if (start > end) break; pg++; if ((sg->table[start].addr >> PAGE_SHIFT) != pg) return (start << PAGE_SHIFT) - ofs; } /* ok, all on continuous pages */ return size; } EXPORT_SYMBOL(snd_sgbuf_get_chunk_size); ion>mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-29 13:50:06 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-29 13:50:06 -0800
commit39cb2c9a316e77f6dfba96c543e55b6672d5a37e (patch)
tree98fe974ee4e20121253de7f61fc8d01bdb3821c1 /drivers/usb/mtu3/Makefile
parent2c5d9555d6d937966d79d4c6529a5f7b9206e405 (diff)
drm/i915: Check for NULL i915_vma in intel_unpin_fb_obj()
I've seen this trigger twice now, where the i915_gem_object_to_ggtt() call in intel_unpin_fb_obj() returns NULL, resulting in an oops immediately afterwards as the (inlined) call to i915_vma_unpin_fence() tries to dereference it. It seems to be some race condition where the object is going away at shutdown time, since both times happened when shutting down the X server. The call chains were different: - VT ioctl(KDSETMODE, KD_TEXT): intel_cleanup_plane_fb+0x5b/0xa0 [i915] drm_atomic_helper_cleanup_planes+0x6f/0x90 [drm_kms_helper] intel_atomic_commit_tail+0x749/0xfe0 [i915] intel_atomic_commit+0x3cb/0x4f0 [i915] drm_atomic_commit+0x4b/0x50 [drm] restore_fbdev_mode+0x14c/0x2a0 [drm_kms_helper] drm_fb_helper_restore_fbdev_mode_unlocked+0x34/0x80 [drm_kms_helper] drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper] intel_fbdev_set_par+0x18/0x70 [i915] fb_set_var+0x236/0x460 fbcon_blank+0x30f/0x350 do_unblank_screen+0xd2/0x1a0 vt_ioctl+0x507/0x12a0 tty_ioctl+0x355/0xc30 do_vfs_ioctl+0xa3/0x5e0 SyS_ioctl+0x79/0x90 entry_SYSCALL_64_fastpath+0x13/0x94 - i915 unpin_work workqueue: intel_unpin_work_fn+0x58/0x140 [i915] process_one_work+0x1f1/0x480 worker_thread+0x48/0x4d0 kthread+0x101/0x140 and this patch purely papers over the issue by adding a NULL pointer check and a WARN_ON_ONCE() to avoid the oops that would then generally make the machine unresponsive. Other callers of i915_gem_object_to_ggtt() seem to also check for the returned pointer being NULL and warn about it, so this clearly has happened before in other places. [ Reported it originally to the i915 developers on Jan 8, applying the ugly workaround on my own now after triggering the problem for the second time with no feedback. This is likely to be the same bug reported as https://bugs.freedesktop.org/show_bug.cgi?id=98829 https://bugs.freedesktop.org/show_bug.cgi?id=99134 which has a patch for the underlying problem, but it hasn't gotten to me, so I'm applying the workaround. ] Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/usb/mtu3/Makefile')