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authorLinus Torvalds <torvalds@linux-foundation.org>2022-05-26 02:18:27 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-05-26 02:18:27 +0300
commit2518f226c60d8e04d18ba4295500a5b0b8ac7659 (patch)
treee74de5ca0db01398cbb0c34376f74a81d7583c75 /drivers/dma-buf
parent86c87bea6b42100c67418af690919c44de6ede6e (diff)
parentc4955d9cd2fc56c43e78c908dad4e2cac7cc9073 (diff)
downloadlinux-2518f226c60d8e04d18ba4295500a5b0b8ac7659.tar.xz
Merge tag 'drm-next-2022-05-25' of git://anongit.freedesktop.org/drm/drm
Pull drm updates from Dave Airlie: "Intel have enabled DG2 on certain SKUs for laptops, AMD has started some new GPU support, msm has user allocated VA controls dma-buf: - add dma_resv_replace_fences - add dma_resv_get_singleton - make dma_excl_fence private core: - EDID parser refactorings - switch drivers to drm_mode_copy/duplicate - DRM managed mutex initialization display-helper: - put HDMI, SCDC, HDCP, DSC and DP into new module gem: - rework fence handling ttm: - rework bulk move handling - add common debugfs for resource managers - convert to kvcalloc format helpers: - support monochrome formats - RGB888, RGB565 to XRGB8888 conversions fbdev: - cfb/sys_imageblit fixes - pagelist corruption fix - create offb platform device - deferred io improvements sysfb: - Kconfig rework - support for VESA mode selection bridge: - conversions to devm_drm_of_get_bridge - conversions to panel_bridge - analogix_dp - autosuspend support - it66121 - audio support - tc358767 - DSI to DPI support - icn6211 - PLL/I2C fixes, DT property - adv7611 - enable DRM_BRIDGE_OP_HPD - anx7625 - fill ELD if no monitor - dw_hdmi - add audio support - lontium LT9211 support, i.MXMP LDB - it6505: Kconfig fix, DPCD set power fix - adv7511 - CEC support for ADV7535 panel: - ltk035c5444t, B133UAN01, NV3052C panel support - DataImage FG040346DSSWBG04 support - st7735r - DT bindings fix - ssd130x - fixes i915: - DG2 laptop PCI-IDs ("motherboard down") - Initial RPL-P PCI IDs - compute engine ABI - DG2 Tile4 support - DG2 CCS clear color compression support - DG2 render/media compression formats support - ATS-M platform info - RPL-S PCI IDs added - Bump ADL-P DMC version to v2.16 - Support static DRRS - Support multiple eDP/LVDS native mode refresh rates - DP HDR support for HSW+ - Lots of display refactoring + fixes - GuC hwconfig support and query - sysfs support for multi-tile - fdinfo per-client gpu utilisation - add geometry subslices query - fix prime mmap with LMEM - fix vm open count and remove vma refcounts - contiguous allocation fixes - steered register write support - small PCI BAR enablement - GuC error capture support - sunset igpu legacy mmap support for newer devices - GuC version 70.1.1 support amdgpu: - Initial SoC21 support - SMU 13.x enablement - SMU 13.0.4 support - ttm_eu cleanups - USB-C, GPUVM updates - TMZ fixes for RV - RAS support for VCN - PM sysfs code cleanup - DC FP rework - extend CG/PG flags to 64-bit - SI dpm lockdep fix - runtime PM fixes amdkfd: - RAS/SVM fixes - TLB flush fixes - CRIU GWS support - ignore bogus MEC signals more efficiently msm: - Fourcc modifier for tiled but not compressed layouts - Support for userspace allocated IOVA (GPU virtual address) - DPU: DSC (Display Stream Compression) support - DP: eDP support - DP: conversion to use drm_bridge and drm_bridge_connector - Merge DPU1 and MDP5 MDSS driver - DPU: writeback support nouveau: - make some structures static - make some variables static - switch to drm_gem_plane_helper_prepare_fb radeon: - misc fixes/cleanups mxsfb: - rework crtc mode setting - LCDIF CRC support etnaviv: - fencing improvements - fix address space collisions - cleanup MMU reference handling gma500: - GEM/GTT improvements - connector handling fixes komeda: - switch to plane reset helper mediatek: - MIPI DSI improvements omapdrm: - GEM improvements qxl: - aarch64 support vc4: - add a CL submission tracepoint - HDMI YUV support - HDMI/clock improvements - drop is_hdmi caching virtio: - remove restriction of non-zero blob types vmwgfx: - support for cursormob and cursorbypass 4 - fence improvements tidss: - reset DISPC on startup solomon: - SPI support - DT improvements sun4i: - allwinner D1 support - drop is_hdmi caching imx: - use swap() instead of open-coding - use devm_platform_ioremap_resource - remove redunant initializations ast: - Displayport support rockchip: - Refactor IOMMU initialisation - make some structures static - replace drm_detect_hdmi_monitor with drm_display_info.is_hdmi - support swapped YUV formats, - clock improvements - rk3568 support - VOP2 support mediatek: - MT8186 support tegra: - debugabillity improvements" * tag 'drm-next-2022-05-25' of git://anongit.freedesktop.org/drm/drm: (1740 commits) drm/i915/dsi: fix VBT send packet port selection for ICL+ drm/i915/uc: Fix undefined behavior due to shift overflowing the constant drm/i915/reg: fix undefined behavior due to shift overflowing the constant drm/i915/gt: Fix use of static in macro mismatch drm/i915/audio: fix audio code enable/disable pipe logging drm/i915: Fix CFI violation with show_dynamic_id() drm/i915: Fix 'mixing different enum types' warnings in intel_display_power.c drm/i915/gt: Fix build error without CONFIG_PM drm/msm/dpu: handle pm_runtime_get_sync() errors in bind path drm/msm/dpu: add DRM_MODE_ROTATE_180 back to supported rotations drm/msm: don't free the IRQ if it was not requested drm/msm/dpu: limit writeback modes according to max_linewidth drm/amd: Don't reset dGPUs if the system is going to s2idle drm/amdgpu: Unmap legacy queue when MES is enabled drm: msm: fix possible memory leak in mdp5_crtc_cursor_set() drm/msm: Fix fb plane offset calculation drm/msm/a6xx: Fix refcount leak in a6xx_gpu_init drm/msm/dsi: don't powerup at modeset time for parade-ps8640 drm/rockchip: Change register space names in vop2 dt-bindings: display: rockchip: make reg-names mandatory for VOP2 ...
Diffstat (limited to 'drivers/dma-buf')
-rw-r--r--drivers/dma-buf/dma-buf.c26
-rw-r--r--drivers/dma-buf/dma-resv.c459
-rw-r--r--drivers/dma-buf/st-dma-resv.c157
-rw-r--r--drivers/dma-buf/sync_file.c21
4 files changed, 334 insertions, 329 deletions
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 53297a0d9c57..32f55640890c 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -216,7 +216,8 @@ static bool dma_buf_poll_add_cb(struct dma_resv *resv, bool write,
struct dma_fence *fence;
int r;
- dma_resv_for_each_fence(&cursor, resv, write, fence) {
+ dma_resv_for_each_fence(&cursor, resv, dma_resv_usage_rw(write),
+ fence) {
dma_fence_get(fence);
r = dma_fence_add_callback(fence, &dcb->cb, dma_buf_poll_cb);
if (!r)
@@ -451,7 +452,7 @@ err_alloc_file:
* as a file descriptor by calling dma_buf_fd().
*
* 2. Userspace passes this file-descriptors to all drivers it wants this buffer
- * to share with: First the filedescriptor is converted to a &dma_buf using
+ * to share with: First the file descriptor is converted to a &dma_buf using
* dma_buf_get(). Then the buffer is attached to the device using
* dma_buf_attach().
*
@@ -668,12 +669,24 @@ static struct sg_table * __map_dma_buf(struct dma_buf_attachment *attach,
enum dma_data_direction direction)
{
struct sg_table *sg_table;
+ signed long ret;
sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);
+ if (IS_ERR_OR_NULL(sg_table))
+ return sg_table;
+
+ if (!dma_buf_attachment_is_dynamic(attach)) {
+ ret = dma_resv_wait_timeout(attach->dmabuf->resv,
+ DMA_RESV_USAGE_KERNEL, true,
+ MAX_SCHEDULE_TIMEOUT);
+ if (ret < 0) {
+ attach->dmabuf->ops->unmap_dma_buf(attach, sg_table,
+ direction);
+ return ERR_PTR(ret);
+ }
+ }
- if (!IS_ERR_OR_NULL(sg_table))
- mangle_sg_table(sg_table);
-
+ mangle_sg_table(sg_table);
return sg_table;
}
@@ -1132,7 +1145,8 @@ static int __dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
long ret;
/* Wait on any implicit rendering fences */
- ret = dma_resv_wait_timeout(resv, write, true, MAX_SCHEDULE_TIMEOUT);
+ ret = dma_resv_wait_timeout(resv, dma_resv_usage_rw(write),
+ true, MAX_SCHEDULE_TIMEOUT);
if (ret < 0)
return ret;
diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index b51416405e86..0cce6e4ec946 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -34,6 +34,7 @@
*/
#include <linux/dma-resv.h>
+#include <linux/dma-fence-array.h>
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/sched/mm.h>
@@ -43,12 +44,12 @@
/**
* DOC: Reservation Object Overview
*
- * The reservation object provides a mechanism to manage shared and
- * exclusive fences associated with a buffer. A reservation object
- * can have attached one exclusive fence (normally associated with
- * write operations) or N shared fences (read operations). The RCU
- * mechanism is used to protect read access to fences from locked
- * write-side updates.
+ * The reservation object provides a mechanism to manage a container of
+ * dma_fence object associated with a resource. A reservation object
+ * can have any number of fences attaches to it. Each fence carries an usage
+ * parameter determining how the operation represented by the fence is using the
+ * resource. The RCU mechanism is used to protect read access to fences from
+ * locked write-side updates.
*
* See struct dma_resv for more details.
*/
@@ -56,33 +57,59 @@
DEFINE_WD_CLASS(reservation_ww_class);
EXPORT_SYMBOL(reservation_ww_class);
-/**
- * dma_resv_list_alloc - allocate fence list
- * @shared_max: number of fences we need space for
- *
+/* Mask for the lower fence pointer bits */
+#define DMA_RESV_LIST_MASK 0x3
+
+struct dma_resv_list {
+ struct rcu_head rcu;
+ u32 num_fences, max_fences;
+ struct dma_fence __rcu *table[];
+};
+
+/* Extract the fence and usage flags from an RCU protected entry in the list. */
+static void dma_resv_list_entry(struct dma_resv_list *list, unsigned int index,
+ struct dma_resv *resv, struct dma_fence **fence,
+ enum dma_resv_usage *usage)
+{
+ long tmp;
+
+ tmp = (long)rcu_dereference_check(list->table[index],
+ resv ? dma_resv_held(resv) : true);
+ *fence = (struct dma_fence *)(tmp & ~DMA_RESV_LIST_MASK);
+ if (usage)
+ *usage = tmp & DMA_RESV_LIST_MASK;
+}
+
+/* Set the fence and usage flags at the specific index in the list. */
+static void dma_resv_list_set(struct dma_resv_list *list,
+ unsigned int index,
+ struct dma_fence *fence,
+ enum dma_resv_usage usage)
+{
+ long tmp = ((long)fence) | usage;
+
+ RCU_INIT_POINTER(list->table[index], (struct dma_fence *)tmp);
+}
+
+/*
* Allocate a new dma_resv_list and make sure to correctly initialize
- * shared_max.
+ * max_fences.
*/
-static struct dma_resv_list *dma_resv_list_alloc(unsigned int shared_max)
+static struct dma_resv_list *dma_resv_list_alloc(unsigned int max_fences)
{
struct dma_resv_list *list;
- list = kmalloc(struct_size(list, shared, shared_max), GFP_KERNEL);
+ list = kmalloc(struct_size(list, table, max_fences), GFP_KERNEL);
if (!list)
return NULL;
- list->shared_max = (ksize(list) - offsetof(typeof(*list), shared)) /
- sizeof(*list->shared);
+ list->max_fences = (ksize(list) - offsetof(typeof(*list), table)) /
+ sizeof(*list->table);
return list;
}
-/**
- * dma_resv_list_free - free fence list
- * @list: list to free
- *
- * Free a dma_resv_list and make sure to drop all references.
- */
+/* Free a dma_resv_list and make sure to drop all references. */
static void dma_resv_list_free(struct dma_resv_list *list)
{
unsigned int i;
@@ -90,9 +117,12 @@ static void dma_resv_list_free(struct dma_resv_list *list)
if (!list)
return;
- for (i = 0; i < list->shared_count; ++i)
- dma_fence_put(rcu_dereference_protected(list->shared[i], true));
+ for (i = 0; i < list->num_fences; ++i) {
+ struct dma_fence *fence;
+ dma_resv_list_entry(list, i, NULL, &fence, NULL);
+ dma_fence_put(fence);
+ }
kfree_rcu(list, rcu);
}
@@ -103,10 +133,8 @@ static void dma_resv_list_free(struct dma_resv_list *list)
void dma_resv_init(struct dma_resv *obj)
{
ww_mutex_init(&obj->lock, &reservation_ww_class);
- seqcount_ww_mutex_init(&obj->seq, &obj->lock);
- RCU_INIT_POINTER(obj->fence, NULL);
- RCU_INIT_POINTER(obj->fence_excl, NULL);
+ RCU_INIT_POINTER(obj->fences, NULL);
}
EXPORT_SYMBOL(dma_resv_init);
@@ -116,51 +144,48 @@ EXPORT_SYMBOL(dma_resv_init);
*/
void dma_resv_fini(struct dma_resv *obj)
{
- struct dma_resv_list *fobj;
- struct dma_fence *excl;
-
/*
* This object should be dead and all references must have
* been released to it, so no need to be protected with rcu.
*/
- excl = rcu_dereference_protected(obj->fence_excl, 1);
- if (excl)
- dma_fence_put(excl);
-
- fobj = rcu_dereference_protected(obj->fence, 1);
- dma_resv_list_free(fobj);
+ dma_resv_list_free(rcu_dereference_protected(obj->fences, true));
ww_mutex_destroy(&obj->lock);
}
EXPORT_SYMBOL(dma_resv_fini);
+/* Dereference the fences while ensuring RCU rules */
+static inline struct dma_resv_list *dma_resv_fences_list(struct dma_resv *obj)
+{
+ return rcu_dereference_check(obj->fences, dma_resv_held(obj));
+}
+
/**
- * dma_resv_reserve_shared - Reserve space to add shared fences to
- * a dma_resv.
+ * dma_resv_reserve_fences - Reserve space to add fences to a dma_resv object.
* @obj: reservation object
* @num_fences: number of fences we want to add
*
- * Should be called before dma_resv_add_shared_fence(). Must
- * be called with @obj locked through dma_resv_lock().
+ * Should be called before dma_resv_add_fence(). Must be called with @obj
+ * locked through dma_resv_lock().
*
* Note that the preallocated slots need to be re-reserved if @obj is unlocked
- * at any time before calling dma_resv_add_shared_fence(). This is validated
- * when CONFIG_DEBUG_MUTEXES is enabled.
+ * at any time before calling dma_resv_add_fence(). This is validated when
+ * CONFIG_DEBUG_MUTEXES is enabled.
*
* RETURNS
* Zero for success, or -errno
*/
-int dma_resv_reserve_shared(struct dma_resv *obj, unsigned int num_fences)
+int dma_resv_reserve_fences(struct dma_resv *obj, unsigned int num_fences)
{
struct dma_resv_list *old, *new;
unsigned int i, j, k, max;
dma_resv_assert_held(obj);
- old = dma_resv_shared_list(obj);
- if (old && old->shared_max) {
- if ((old->shared_count + num_fences) <= old->shared_max)
+ old = dma_resv_fences_list(obj);
+ if (old && old->max_fences) {
+ if ((old->num_fences + num_fences) <= old->max_fences)
return 0;
- max = max(old->shared_count + num_fences, old->shared_max * 2);
+ max = max(old->num_fences + num_fences, old->max_fences * 2);
} else {
max = max(4ul, roundup_pow_of_two(num_fences));
}
@@ -175,27 +200,27 @@ int dma_resv_reserve_shared(struct dma_resv *obj, unsigned int num_fences)
* references from the old struct are carried over to
* the new.
*/
- for (i = 0, j = 0, k = max; i < (old ? old->shared_count : 0); ++i) {
+ for (i = 0, j = 0, k = max; i < (old ? old->num_fences : 0); ++i) {
+ enum dma_resv_usage usage;
struct dma_fence *fence;
- fence = rcu_dereference_protected(old->shared[i],
- dma_resv_held(obj));
+ dma_resv_list_entry(old, i, obj, &fence, &usage);
if (dma_fence_is_signaled(fence))
- RCU_INIT_POINTER(new->shared[--k], fence);
+ RCU_INIT_POINTER(new->table[--k], fence);
else
- RCU_INIT_POINTER(new->shared[j++], fence);
+ dma_resv_list_set(new, j++, fence, usage);
}
- new->shared_count = j;
+ new->num_fences = j;
/*
* We are not changing the effective set of fences here so can
* merely update the pointer to the new array; both existing
* readers and new readers will see exactly the same set of
- * active (unsignaled) shared fences. Individual fences and the
+ * active (unsignaled) fences. Individual fences and the
* old array are protected by RCU and so will not vanish under
* the gaze of the rcu_read_lock() readers.
*/
- rcu_assign_pointer(obj->fence, new);
+ rcu_assign_pointer(obj->fences, new);
if (!old)
return 0;
@@ -204,7 +229,7 @@ int dma_resv_reserve_shared(struct dma_resv *obj, unsigned int num_fences)
for (i = k; i < max; ++i) {
struct dma_fence *fence;
- fence = rcu_dereference_protected(new->shared[i],
+ fence = rcu_dereference_protected(new->table[i],
dma_resv_held(obj));
dma_fence_put(fence);
}
@@ -212,41 +237,43 @@ int dma_resv_reserve_shared(struct dma_resv *obj, unsigned int num_fences)
return 0;
}
-EXPORT_SYMBOL(dma_resv_reserve_shared);
+EXPORT_SYMBOL(dma_resv_reserve_fences);
#ifdef CONFIG_DEBUG_MUTEXES
/**
- * dma_resv_reset_shared_max - reset shared fences for debugging
+ * dma_resv_reset_max_fences - reset fences for debugging
* @obj: the dma_resv object to reset
*
- * Reset the number of pre-reserved shared slots to test that drivers do
- * correct slot allocation using dma_resv_reserve_shared(). See also
- * &dma_resv_list.shared_max.
+ * Reset the number of pre-reserved fence slots to test that drivers do
+ * correct slot allocation using dma_resv_reserve_fences(). See also
+ * &dma_resv_list.max_fences.
*/
-void dma_resv_reset_shared_max(struct dma_resv *obj)
+void dma_resv_reset_max_fences(struct dma_resv *obj)
{
- struct dma_resv_list *fences = dma_resv_shared_list(obj);
+ struct dma_resv_list *fences = dma_resv_fences_list(obj);
dma_resv_assert_held(obj);
- /* Test shared fence slot reservation */
+ /* Test fence slot reservation */
if (fences)
- fences->shared_max = fences->shared_count;
+ fences->max_fences = fences->num_fences;
}
-EXPORT_SYMBOL(dma_resv_reset_shared_max);
+EXPORT_SYMBOL(dma_resv_reset_max_fences);
#endif
/**
- * dma_resv_add_shared_fence - Add a fence to a shared slot
+ * dma_resv_add_fence - Add a fence to the dma_resv obj
* @obj: the reservation object
- * @fence: the shared fence to add
+ * @fence: the fence to add
+ * @usage: how the fence is used, see enum dma_resv_usage
*
- * Add a fence to a shared slot, @obj must be locked with dma_resv_lock(), and
- * dma_resv_reserve_shared() has been called.
+ * Add a fence to a slot, @obj must be locked with dma_resv_lock(), and
+ * dma_resv_reserve_fences() has been called.
*
* See also &dma_resv.fence for a discussion of the semantics.
*/
-void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence)
+void dma_resv_add_fence(struct dma_resv *obj, struct dma_fence *fence,
+ enum dma_resv_usage usage)
{
struct dma_resv_list *fobj;
struct dma_fence *old;
@@ -261,118 +288,105 @@ void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence)
*/
WARN_ON(dma_fence_is_container(fence));
- fobj = dma_resv_shared_list(obj);
- count = fobj->shared_count;
-
- write_seqcount_begin(&obj->seq);
+ fobj = dma_resv_fences_list(obj);
+ count = fobj->num_fences;
for (i = 0; i < count; ++i) {
-
- old = rcu_dereference_protected(fobj->shared[i],
- dma_resv_held(obj));
- if (old->context == fence->context ||
- dma_fence_is_signaled(old))
- goto replace;
+ enum dma_resv_usage old_usage;
+
+ dma_resv_list_entry(fobj, i, obj, &old, &old_usage);
+ if ((old->context == fence->context && old_usage >= usage) ||
+ dma_fence_is_signaled(old)) {
+ dma_resv_list_set(fobj, i, fence, usage);
+ dma_fence_put(old);
+ return;
+ }
}
- BUG_ON(fobj->shared_count >= fobj->shared_max);
- old = NULL;
+ BUG_ON(fobj->num_fences >= fobj->max_fences);
count++;
-replace:
- RCU_INIT_POINTER(fobj->shared[i], fence);
- /* pointer update must be visible before we extend the shared_count */
- smp_store_mb(fobj->shared_count, count);
-
- write_seqcount_end(&obj->seq);
- dma_fence_put(old);
+ dma_resv_list_set(fobj, i, fence, usage);
+ /* pointer update must be visible before we extend the num_fences */
+ smp_store_mb(fobj->num_fences, count);
}
-EXPORT_SYMBOL(dma_resv_add_shared_fence);
+EXPORT_SYMBOL(dma_resv_add_fence);
/**
- * dma_resv_add_excl_fence - Add an exclusive fence.
+ * dma_resv_replace_fences - replace fences in the dma_resv obj
* @obj: the reservation object
- * @fence: the exclusive fence to add
+ * @context: the context of the fences to replace
+ * @replacement: the new fence to use instead
+ * @usage: how the new fence is used, see enum dma_resv_usage
+ *
+ * Replace fences with a specified context with a new fence. Only valid if the
+ * operation represented by the original fence has no longer access to the
+ * resources represented by the dma_resv object when the new fence completes.
*
- * Add a fence to the exclusive slot. @obj must be locked with dma_resv_lock().
- * Note that this function replaces all fences attached to @obj, see also
- * &dma_resv.fence_excl for a discussion of the semantics.
+ * And example for using this is replacing a preemption fence with a page table
+ * update fence which makes the resource inaccessible.
*/
-void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence)
+void dma_resv_replace_fences(struct dma_resv *obj, uint64_t context,
+ struct dma_fence *replacement,
+ enum dma_resv_usage usage)
{
- struct dma_fence *old_fence = dma_resv_excl_fence(obj);
- struct dma_resv_list *old;
- u32 i = 0;
+ struct dma_resv_list *list;
+ unsigned int i;
dma_resv_assert_held(obj);
- old = dma_resv_shared_list(obj);
- if (old)
- i = old->shared_count;
-
- dma_fence_get(fence);
-
- write_seqcount_begin(&obj->seq);
- /* write_seqcount_begin provides the necessary memory barrier */
- RCU_INIT_POINTER(obj->fence_excl, fence);
- if (old)
- old->shared_count = 0;
- write_seqcount_end(&obj->seq);
+ list = dma_resv_fences_list(obj);
+ for (i = 0; list && i < list->num_fences; ++i) {
+ struct dma_fence *old;
- /* inplace update, no shared fences */
- while (i--)
- dma_fence_put(rcu_dereference_protected(old->shared[i],
- dma_resv_held(obj)));
+ dma_resv_list_entry(list, i, obj, &old, NULL);
+ if (old->context != context)
+ continue;
- dma_fence_put(old_fence);
+ dma_resv_list_set(list, i, replacement, usage);
+ dma_fence_put(old);
+ }
}
-EXPORT_SYMBOL(dma_resv_add_excl_fence);
+EXPORT_SYMBOL(dma_resv_replace_fences);
-/* Restart the iterator by initializing all the necessary fields, but not the
- * relation to the dma_resv object. */
+/* Restart the unlocked iteration by initializing the cursor object. */
static void dma_resv_iter_restart_unlocked(struct dma_resv_iter *cursor)
{
- cursor->seq = read_seqcount_begin(&cursor->obj->seq);
- cursor->index = -1;
- cursor->shared_count = 0;
- if (cursor->all_fences) {
- cursor->fences = dma_resv_shared_list(cursor->obj);
- if (cursor->fences)
- cursor->shared_count = cursor->fences->shared_count;
- } else {
- cursor->fences = NULL;
- }
+ cursor->index = 0;
+ cursor->num_fences = 0;
+ cursor->fences = dma_resv_fences_list(cursor->obj);
+ if (cursor->fences)
+ cursor->num_fences = cursor->fences->num_fences;
cursor->is_restarted = true;
}
/* Walk to the next not signaled fence and grab a reference to it */
static void dma_resv_iter_walk_unlocked(struct dma_resv_iter *cursor)
{
- struct dma_resv *obj = cursor->obj;
+ if (!cursor->fences)
+ return;
do {
/* Drop the reference from the previous round */
dma_fence_put(cursor->fence);
- if (cursor->index == -1) {
- cursor->fence = dma_resv_excl_fence(obj);
- cursor->index++;
- if (!cursor->fence)
- continue;
-
- } else if (!cursor->fences ||
- cursor->index >= cursor->shared_count) {
+ if (cursor->index >= cursor->num_fences) {
cursor->fence = NULL;
break;
- } else {
- struct dma_resv_list *fences = cursor->fences;
- unsigned int idx = cursor->index++;
-
- cursor->fence = rcu_dereference(fences->shared[idx]);
}
+
+ dma_resv_list_entry(cursor->fences, cursor->index++,
+ cursor->obj, &cursor->fence,
+ &cursor->fence_usage);
cursor->fence = dma_fence_get_rcu(cursor->fence);
- if (!cursor->fence || !dma_fence_is_signaled(cursor->fence))
+ if (!cursor->fence) {
+ dma_resv_iter_restart_unlocked(cursor);
+ continue;
+ }
+
+ if (!dma_fence_is_signaled(cursor->fence) &&
+ cursor->usage >= cursor->fence_usage)
break;
} while (true);
}
@@ -395,7 +409,7 @@ struct dma_fence *dma_resv_iter_first_unlocked(struct dma_resv_iter *cursor)
do {
dma_resv_iter_restart_unlocked(cursor);
dma_resv_iter_walk_unlocked(cursor);
- } while (read_seqcount_retry(&cursor->obj->seq, cursor->seq));
+ } while (dma_resv_fences_list(cursor->obj) != cursor->fences);
rcu_read_unlock();
return cursor->fence;
@@ -418,13 +432,13 @@ struct dma_fence *dma_resv_iter_next_unlocked(struct dma_resv_iter *cursor)
rcu_read_lock();
cursor->is_restarted = false;
- restart = read_seqcount_retry(&cursor->obj->seq, cursor->seq);
+ restart = dma_resv_fences_list(cursor->obj) != cursor->fences;
do {
if (restart)
dma_resv_iter_restart_unlocked(cursor);
dma_resv_iter_walk_unlocked(cursor);
restart = true;
- } while (read_seqcount_retry(&cursor->obj->seq, cursor->seq));
+ } while (dma_resv_fences_list(cursor->obj) != cursor->fences);
rcu_read_unlock();
return cursor->fence;
@@ -447,15 +461,9 @@ struct dma_fence *dma_resv_iter_first(struct dma_resv_iter *cursor)
dma_resv_assert_held(cursor->obj);
cursor->index = 0;
- if (cursor->all_fences)
- cursor->fences = dma_resv_shared_list(cursor->obj);
- else
- cursor->fences = NULL;
-
- fence = dma_resv_excl_fence(cursor->obj);
- if (!fence)
- fence = dma_resv_iter_next(cursor);
+ cursor->fences = dma_resv_fences_list(cursor->obj);
+ fence = dma_resv_iter_next(cursor);
cursor->is_restarted = true;
return fence;
}
@@ -470,17 +478,22 @@ EXPORT_SYMBOL_GPL(dma_resv_iter_first);
*/
struct dma_fence *dma_resv_iter_next(struct dma_resv_iter *cursor)
{
- unsigned int idx;
+ struct dma_fence *fence;
dma_resv_assert_held(cursor->obj);
cursor->is_restarted = false;
- if (!cursor->fences || cursor->index >= cursor->fences->shared_count)
- return NULL;
- idx = cursor->index++;
- return rcu_dereference_protected(cursor->fences->shared[idx],
- dma_resv_held(cursor->obj));
+ do {
+ if (!cursor->fences ||
+ cursor->index >= cursor->fences->num_fences)
+ return NULL;
+
+ dma_resv_list_entry(cursor->fences, cursor->index++,
+ cursor->obj, &fence, &cursor->fence_usage);
+ } while (cursor->fence_usage > cursor->usage);
+
+ return fence;
}
EXPORT_SYMBOL_GPL(dma_resv_iter_next);
@@ -495,60 +508,43 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src)
{
struct dma_resv_iter cursor;
struct dma_resv_list *list;
- struct dma_fence *f, *excl;
+ struct dma_fence *f;
dma_resv_assert_held(dst);
list = NULL;
- excl = NULL;
- dma_resv_iter_begin(&cursor, src, true);
+ dma_resv_iter_begin(&cursor, src, DMA_RESV_USAGE_BOOKKEEP);
dma_resv_for_each_fence_unlocked(&cursor, f) {
if (dma_resv_iter_is_restarted(&cursor)) {
dma_resv_list_free(list);
- dma_fence_put(excl);
-
- if (cursor.shared_count) {
- list = dma_resv_list_alloc(cursor.shared_count);
- if (!list) {
- dma_resv_iter_end(&cursor);
- return -ENOMEM;
- }
- list->shared_count = 0;
-
- } else {
- list = NULL;
+ list = dma_resv_list_alloc(cursor.num_fences);
+ if (!list) {
+ dma_resv_iter_end(&cursor);
+ return -ENOMEM;
}
- excl = NULL;
+ list->num_fences = 0;
}
dma_fence_get(f);
- if (dma_resv_iter_is_exclusive(&cursor))
- excl = f;
- else
- RCU_INIT_POINTER(list->shared[list->shared_count++], f);
+ dma_resv_list_set(list, list->num_fences++, f,
+ dma_resv_iter_usage(&cursor));
}
dma_resv_iter_end(&cursor);
- write_seqcount_begin(&dst->seq);
- excl = rcu_replace_pointer(dst->fence_excl, excl, dma_resv_held(dst));
- list = rcu_replace_pointer(dst->fence, list, dma_resv_held(dst));
- write_seqcount_end(&dst->seq);
-
+ list = rcu_replace_pointer(dst->fences, list, dma_resv_held(dst));
dma_resv_list_free(list);
- dma_fence_put(excl);
-
return 0;
}
EXPORT_SYMBOL(dma_resv_copy_fences);
/**
- * dma_resv_get_fences - Get an object's shared and exclusive
+ * dma_resv_get_fences - Get an object's fences
* fences without update side lock held
* @obj: the reservation object
- * @write: true if we should return all fences
+ * @usage: controls which fences to include, see enum dma_resv_usage.
* @num_fences: the number of fences returned
* @fences: the array of fence ptrs returned (array is krealloc'd to the
* required size, and must be freed by caller)
@@ -556,7 +552,7 @@ EXPORT_SYMBOL(dma_resv_copy_fences);
* Retrieve all fences from the reservation object.
* Returns either zero or -ENOMEM.
*/
-int dma_resv_get_fences(struct dma_resv *obj, bool write,
+int dma_resv_get_fences(struct dma_resv *obj, enum dma_resv_usage usage,
unsigned int *num_fences, struct dma_fence ***fences)
{
struct dma_resv_iter cursor;
@@ -565,7 +561,7 @@ int dma_resv_get_fences(struct dma_resv *obj, bool write,
*num_fences = 0;
*fences = NULL;
- dma_resv_iter_begin(&cursor, obj, write);
+ dma_resv_iter_begin(&cursor, obj, usage);
dma_resv_for_each_fence_unlocked(&cursor, fence) {
if (dma_resv_iter_is_restarted(&cursor)) {
@@ -574,7 +570,7 @@ int dma_resv_get_fences(struct dma_resv *obj, bool write,
while (*num_fences)
dma_fence_put((*fences)[--(*num_fences)]);
- count = cursor.shared_count + 1;
+ count = cursor.num_fences + 1;
/* Eventually re-allocate the array */
*fences = krealloc_array(*fences, count,
@@ -595,10 +591,62 @@ int dma_resv_get_fences(struct dma_resv *obj, bool write,
EXPORT_SYMBOL_GPL(dma_resv_get_fences);
/**
- * dma_resv_wait_timeout - Wait on reservation's objects
- * shared and/or exclusive fences.
+ * dma_resv_get_singleton - Get a single fence for all the fences
+ * @obj: the reservation object
+ * @usage: controls which fences to include, see enum dma_resv_usage.
+ * @fence: the resulting fence
+ *
+ * Get a single fence representing all the fences inside the resv object.
+ * Returns either 0 for success or -ENOMEM.
+ *
+ * Warning: This can't be used like this when adding the fence back to the resv
+ * object since that can lead to stack corruption when finalizing the
+ * dma_fence_array.
+ *
+ * Returns 0 on success and negative error values on failure.
+ */
+int dma_resv_get_singleton(struct dma_resv *obj, enum dma_resv_usage usage,
+ struct dma_fence **fence)
+{
+ struct dma_fence_array *array;
+ struct dma_fence **fences;
+ unsigned count;
+ int r;
+
+ r = dma_resv_get_fences(obj, usage, &count, &fences);
+ if (r)
+ return r;
+
+ if (count == 0) {
+ *fence = NULL;
+ return 0;
+ }
+
+ if (count == 1) {
+ *fence = fences[0];
+ kfree(fences);
+ return 0;
+ }
+
+ array = dma_fence_array_create(count, fences,
+ dma_fence_context_alloc(1),
+ 1, false);
+ if (!array) {
+ while (count--)
+ dma_fence_put(fences[count]);
+ kfree(fences);
+ return -ENOMEM;
+ }
+
+ *fence = &array->base;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(dma_resv_get_singleton);
+
+/**
+ * dma_resv_wait_timeout - Wait on reservation's objects fences
* @obj: the reservation object
- * @wait_all: if true, wait on all fences, else wait on just exclusive fence
+ * @usage: controls which fences to include, see enum dma_resv_usage.
* @intr: if true, do interruptible wait
* @timeout: timeout value in jiffies or zero to return immediately
*
@@ -608,14 +656,14 @@ EXPORT_SYMBOL_GPL(dma_resv_get_fences);
* Returns -ERESTARTSYS if interrupted, 0 if the wait timed out, or
* greater than zer on success.
*/
-long dma_resv_wait_timeout(struct dma_resv *obj, bool wait_all, bool intr,
- unsigned long timeout)
+long dma_resv_wait_timeout(struct dma_resv *obj, enum dma_resv_usage usage,
+ bool intr, unsigned long timeout)
{
long ret = timeout ? timeout : 1;
struct dma_resv_iter cursor;
struct dma_fence *fence;
- dma_resv_iter_begin(&cursor, obj, wait_all);
+ dma_resv_iter_begin(&cursor, obj, usage);
dma_resv_for_each_fence_unlocked(&cursor, fence) {
ret = dma_fence_wait_timeout(fence, intr, ret);
@@ -635,8 +683,7 @@ EXPORT_SYMBOL_GPL(dma_resv_wait_timeout);
* dma_resv_test_signaled - Test if a reservation object's fences have been
* signaled.
* @obj: the reservation object
- * @test_all: if true, test all fences, otherwise only test the exclusive
- * fence
+ * @usage: controls which fences to include, see enum dma_resv_usage.
*
* Callers are not required to hold specific locks, but maybe hold
* dma_resv_lock() already.
@@ -645,12 +692,12 @@ EXPORT_SYMBOL_GPL(dma_resv_wait_timeout);
*
* True if all fences signaled, else false.
*/
-bool dma_resv_test_signaled(struct dma_resv *obj, bool test_all)
+bool dma_resv_test_signaled(struct dma_resv *obj, enum dma_resv_usage usage)
{
struct dma_resv_iter cursor;
struct dma_fence *fence;
- dma_resv_iter_begin(&cursor, obj, test_all);
+ dma_resv_iter_begin(&cursor, obj, usage);
dma_resv_for_each_fence_unlocked(&cursor, fence) {
dma_resv_iter_end(&cursor);
return false;
@@ -670,13 +717,13 @@ EXPORT_SYMBOL_GPL(dma_resv_test_signaled);
*/
void dma_resv_describe(struct dma_resv *obj, struct seq_file *seq)
{
+ static const char *usage[] = { "kernel", "write", "read", "bookkeep" };
struct dma_resv_iter cursor;
struct dma_fence *fence;
- dma_resv_for_each_fence(&cursor, obj, true, fence) {
+ dma_resv_for_each_fence(&cursor, obj, DMA_RESV_USAGE_READ, fence) {
seq_printf(seq, "\t%s fence:",
- dma_resv_iter_is_exclusive(&cursor) ?
- "Exclusive" : "Shared");
+ usage[dma_resv_iter_usage(&cursor)]);
dma_fence_describe(fence, seq);
}
}
diff --git a/drivers/dma-buf/st-dma-resv.c b/drivers/dma-buf/st-dma-resv.c
index cbe999c6e7a6..813779e3c9be 100644
--- a/drivers/dma-buf/st-dma-resv.c
+++ b/drivers/dma-buf/st-dma-resv.c
@@ -58,8 +58,9 @@ static int sanitycheck(void *arg)
return r;
}
-static int test_signaling(void *arg, bool shared)
+static int test_signaling(void *arg)
{
+ enum dma_resv_usage usage = (unsigned long)arg;
struct dma_resv resv;
struct dma_fence *f;
int r;
@@ -75,25 +76,20 @@ static int test_signaling(void *arg, bool shared)
goto err_free;
}
- if (shared) {
- r = dma_resv_reserve_shared(&resv, 1);
- if (r) {
- pr_err("Resv shared slot allocation failed\n");
- goto err_unlock;
- }
-
- dma_resv_add_shared_fence(&resv, f);
- } else {
- dma_resv_add_excl_fence(&resv, f);
+ r = dma_resv_reserve_fences(&resv, 1);
+ if (r) {
+ pr_err("Resv shared slot allocation failed\n");
+ goto err_unlock;
}
- if (dma_resv_test_signaled(&resv, shared)) {
+ dma_resv_add_fence(&resv, f, usage);
+ if (dma_resv_test_signaled(&resv, usage)) {
pr_err("Resv unexpectedly signaled\n");
r = -EINVAL;
goto err_unlock;
}
dma_fence_signal(f);
- if (!dma_resv_test_signaled(&resv, shared)) {
+ if (!dma_resv_test_signaled(&resv, usage)) {
pr_err("Resv not reporting signaled\n");
r = -EINVAL;
goto err_unlock;
@@ -106,18 +102,9 @@ err_free:
return r;
}
-static int test_excl_signaling(void *arg)
-{
- return test_signaling(arg, false);
-}
-
-static int test_shared_signaling(void *arg)
-{
- return test_signaling(arg, true);
-}
-
-static int test_for_each(void *arg, bool shared)
+static int test_for_each(void *arg)
{
+ enum dma_resv_usage usage = (unsigned long)arg;
struct dma_resv_iter cursor;
struct dma_fence *f, *fence;
struct dma_resv resv;
@@ -134,20 +121,16 @@ static int test_for_each(void *arg, bool shared)
goto err_free;
}
- if (shared) {
- r = dma_resv_reserve_shared(&resv, 1);
- if (r) {
- pr_err("Resv shared slot allocation failed\n");
- goto err_unlock;
- }
-
- dma_resv_add_shared_fence(&resv, f);
- } else {
- dma_resv_add_excl_fence(&resv, f);
+ r = dma_resv_reserve_fences(&resv, 1);
+ if (r) {
+ pr_err("Resv shared slot allocation failed\n");
+ goto err_unlock;
}
+ dma_resv_add_fence(&resv, f, usage);
+
r = -ENOENT;
- dma_resv_for_each_fence(&cursor, &resv, shared, fence) {
+ dma_resv_for_each_fence(&cursor, &resv, usage, fence) {
if (!r) {
pr_err("More than one fence found\n");
r = -EINVAL;
@@ -158,7 +141,7 @@ static int test_for_each(void *arg, bool shared)
r = -EINVAL;
goto err_unlock;
}
- if (dma_resv_iter_is_exclusive(&cursor) != !shared) {
+ if (dma_resv_iter_usage(&cursor) != usage) {
pr_err("Unexpected fence usage\n");
r = -EINVAL;
goto err_unlock;
@@ -178,18 +161,9 @@ err_free:
return r;
}
-static int test_excl_for_each(void *arg)
-{
- return test_for_each(arg, false);
-}
-
-static int test_shared_for_each(void *arg)
-{
- return test_for_each(arg, true);
-}
-
-static int test_for_each_unlocked(void *arg, bool shared)
+static int test_for_each_unlocked(void *arg)
{
+ enum dma_resv_usage usage = (unsigned long)arg;
struct dma_resv_iter cursor;
struct dma_fence *f, *fence;
struct dma_resv resv;
@@ -206,22 +180,18 @@ static int test_for_each_unlocked(void *arg, bool shared)
goto err_free;
}
- if (shared) {
- r = dma_resv_reserve_shared(&resv, 1);
- if (r) {
- pr_err("Resv shared slot allocation failed\n");
- dma_resv_unlock(&resv);
- goto err_free;
- }
-
- dma_resv_add_shared_fence(&resv, f);
- } else {
- dma_resv_add_excl_fence(&resv, f);
+ r = dma_resv_reserve_fences(&resv, 1);
+ if (r) {
+ pr_err("Resv shared slot allocation failed\n");
+ dma_resv_unlock(&resv);
+ goto err_free;
}
+
+ dma_resv_add_fence(&resv, f, usage);
dma_resv_unlock(&resv);
r = -ENOENT;
- dma_resv_iter_begin(&cursor, &resv, shared);
+ dma_resv_iter_begin(&cursor, &resv, usage);
dma_resv_for_each_fence_unlocked(&cursor, fence) {
if (!r) {
pr_err("More than one fence found\n");
@@ -237,7 +207,7 @@ static int test_for_each_unlocked(void *arg, bool shared)
r = -EINVAL;
goto err_iter_end;
}
- if (dma_resv_iter_is_exclusive(&cursor) != !shared) {
+ if (dma_resv_iter_usage(&cursor) != usage) {
pr_err("Unexpected fence usage\n");
r = -EINVAL;
goto err_iter_end;
@@ -247,7 +217,7 @@ static int test_for_each_unlocked(void *arg, bool shared)
if (r == -ENOENT) {
r = -EINVAL;
/* That should trigger an restart */
- cursor.seq--;
+ cursor.fences = (void*)~0;
} else if (r == -EINVAL) {
r = 0;
}
@@ -263,18 +233,9 @@ err_free:
return r;
}
-static int test_excl_for_each_unlocked(void *arg)
-{
- return test_for_each_unlocked(arg, false);
-}
-
-static int test_shared_for_each_unlocked(void *arg)
-{
- return test_for_each_unlocked(arg, true);
-}
-
-static int test_get_fences(void *arg, bool shared)
+static int test_get_fences(void *arg)
{
+ enum dma_resv_usage usage = (unsigned long)arg;
struct dma_fence *f, **fences = NULL;
struct dma_resv resv;
int r, i;
@@ -290,21 +251,17 @@ static int test_get_fences(void *arg, bool shared)
goto err_resv;
}
- if (shared) {
- r = dma_resv_reserve_shared(&resv, 1);
- if (r) {
- pr_err("Resv shared slot allocation failed\n");
- dma_resv_unlock(&resv);
- goto err_resv;
- }
-
- dma_resv_add_shared_fence(&resv, f);
- } else {
- dma_resv_add_excl_fence(&resv, f);
+ r = dma_resv_reserve_fences(&resv, 1);
+ if (r) {
+ pr_err("Resv shared slot allocation failed\n");
+ dma_resv_unlock(&resv);
+ goto err_resv;
}
+
+ dma_resv_add_fence(&resv, f, usage);
dma_resv_unlock(&resv);
- r = dma_resv_get_fences(&resv, shared, &i, &fences);
+ r = dma_resv_get_fences(&resv, usage, &i, &fences);
if (r) {
pr_err("get_fences failed\n");
goto err_free;
@@ -326,30 +283,24 @@ err_resv:
return r;
}
-static int test_excl_get_fences(void *arg)
-{
- return test_get_fences(arg, false);
-}
-
-static int test_shared_get_fences(void *arg)
-{
- return test_get_fences(arg, true);
-}
-
int dma_resv(void)
{
static const struct subtest tests[] = {
SUBTEST(sanitycheck),
- SUBTEST(test_excl_signaling),
- SUBTEST(test_shared_signaling),
- SUBTEST(test_excl_for_each),
- SUBTEST(test_shared_for_each),
- SUBTEST(test_excl_for_each_unlocked),
- SUBTEST(test_shared_for_each_unlocked),
- SUBTEST(test_excl_get_fences),
- SUBTEST(test_shared_get_fences),
+ SUBTEST(test_signaling),
+ SUBTEST(test_for_each),
+ SUBTEST(test_for_each_unlocked),
+ SUBTEST(test_get_fences),
};
+ enum dma_resv_usage usage;
+ int r;
spin_lock_init(&fence_lock);
- return subtests(tests, NULL);
+ for (usage = DMA_RESV_USAGE_KERNEL; usage <= DMA_RESV_USAGE_BOOKKEEP;
+ ++usage) {
+ r = subtests(tests, (void *)(unsigned long)usage);
+ if (r)
+ return r;
+ }
+ return 0;
}
diff --git a/drivers/dma-buf/sync_file.c b/drivers/dma-buf/sync_file.c
index 514d213261df..0fe564539166 100644
--- a/drivers/dma-buf/sync_file.c
+++ b/drivers/dma-buf/sync_file.c
@@ -157,9 +157,15 @@ static int sync_file_set_fence(struct sync_file *sync_file,
* we already own a new reference to the fence. For num_fence > 1
* we own the reference of the dma_fence_array creation.
*/
- if (num_fences == 1) {
+
+ if (num_fences == 0) {
+ sync_file->fence = dma_fence_get_stub();
+ kfree(fences);
+
+ } else if (num_fences == 1) {
sync_file->fence = fences[0];
kfree(fences);
+
} else {
array = dma_fence_array_create(num_fences, fences,
dma_fence_context_alloc(1),
@@ -261,19 +267,6 @@ static struct sync_file *sync_file_merge(const char *name, struct sync_file *a,
}
}
- if (index == 0)
- fences[index++] = dma_fence_get_stub();
-
- if (num_fences > index) {
- struct dma_fence **tmp;
-
- /* Keep going even when reducing the size failed */
- tmp = krealloc_array(fences, index, sizeof(*fences),
- GFP_KERNEL);
- if (tmp)
- fences = tmp;
- }
-
if (sync_file_set_fence(sync_file, fences, index) < 0)
goto err_put_fences;