[PATCH -next 03/11] drm/vmwgfx: Fix multiple command buffer context use
Thomas Hellstrom
thellstrom at vmware.com
Thu Mar 22 10:23:44 UTC 2018
The start / stop and preempt commands don't honor the context argument
but rather acts on all available contexts.
Also add detection for context 1 availability.
Note that currently there's no driver interface for submitting buffers
using the high-priority command queue (context 1).
Testing done:
Change the default context for command submission to 1 instead of 0,
verify basic desktop functionality including faulty command injection and
recovery.
Signed-off-by: Thomas Hellstrom <thellstrom at vmware.com>
Reviewed-by: Brian Paul <brianp at vmware.com>
Reviewed-by: Deepak Rawat <drawat at vmware.com>
---
drivers/gpu/drm/vmwgfx/device_include/svga_reg.h | 12 ++++-
drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c | 57 +++++++++++-------------
drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 2 +
3 files changed, 38 insertions(+), 33 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/device_include/svga_reg.h b/drivers/gpu/drm/vmwgfx/device_include/svga_reg.h
index 6e0ccb70a700..88e72bf9a534 100644
--- a/drivers/gpu/drm/vmwgfx/device_include/svga_reg.h
+++ b/drivers/gpu/drm/vmwgfx/device_include/svga_reg.h
@@ -372,6 +372,14 @@ SVGAGuestPtr;
* PA, not biased by the offset. When the command buffer is finished
* the guest should not read the offset field as there is no guarantee
* what it will set to.
+ *
+ * When the SVGA_CAP_HP_CMD_QUEUE cap bit is set a new command queue
+ * SVGA_CB_CONTEXT_1 is available. Commands submitted to this queue
+ * will be executed as quickly as possible by the SVGA device
+ * potentially before already queued commands on SVGA_CB_CONTEXT_0.
+ * The SVGA device guarantees that any command buffers submitted to
+ * SVGA_CB_CONTEXT_0 will be executed after any _already_ submitted
+ * command buffers to SVGA_CB_CONTEXT_1.
*/
#define SVGA_CB_MAX_SIZE (512 * 1024) /* 512 KB */
@@ -382,7 +390,8 @@ SVGAGuestPtr;
typedef enum {
SVGA_CB_CONTEXT_DEVICE = 0x3f,
SVGA_CB_CONTEXT_0 = 0x0,
- SVGA_CB_CONTEXT_MAX = 0x1,
+ SVGA_CB_CONTEXT_1 = 0x1, /* Supported with SVGA_CAP_HP_CMD_QUEUE */
+ SVGA_CB_CONTEXT_MAX = 0x2,
} SVGACBContext;
@@ -689,6 +698,7 @@ SVGASignedPoint;
#define SVGA_CAP_CMD_BUFFERS_2 0x04000000
#define SVGA_CAP_GBOBJECTS 0x08000000
#define SVGA_CAP_DX 0x10000000
+#define SVGA_CAP_HP_CMD_QUEUE 0x20000000
#define SVGA_CAP_CMD_RESERVED 0x80000000
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c
index f283324ce598..9f45d5004cae 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c
@@ -101,6 +101,7 @@ struct vmw_cmdbuf_context {
* @handle: DMA address handle for the command buffer space if @using_mob is
* false. Immutable.
* @size: The size of the command buffer space. Immutable.
+ * @num_contexts: Number of contexts actually enabled.
*/
struct vmw_cmdbuf_man {
struct mutex cur_mutex;
@@ -128,6 +129,7 @@ struct vmw_cmdbuf_man {
bool has_pool;
dma_addr_t handle;
size_t size;
+ u32 num_contexts;
};
/**
@@ -185,7 +187,7 @@ struct vmw_cmdbuf_alloc_info {
/* Loop over each context in the command buffer manager. */
#define for_each_cmdbuf_ctx(_man, _i, _ctx) \
- for (_i = 0, _ctx = &(_man)->ctx[0]; (_i) < SVGA_CB_CONTEXT_MAX; \
+ for (_i = 0, _ctx = &(_man)->ctx[0]; (_i) < (_man)->num_contexts; \
++(_i), ++(_ctx))
static int vmw_cmdbuf_startstop(struct vmw_cmdbuf_man *man, u32 context,
@@ -514,6 +516,7 @@ static void vmw_cmdbuf_work_func(struct work_struct *work)
struct list_head restart_head[SVGA_CB_CONTEXT_MAX];
int i;
struct vmw_cmdbuf_context *ctx;
+ bool global_block = false;
for_each_cmdbuf_ctx(man, i, ctx) {
INIT_LIST_HEAD(&restart_head[i]);
@@ -531,6 +534,7 @@ static void vmw_cmdbuf_work_func(struct work_struct *work)
list_del_init(&entry->list);
restart[entry->cb_context] = true;
+ global_block = true;
if (!vmw_cmd_describe(header, &error_cmd_size, &cmd_name)) {
DRM_ERROR("Unknown command causing device error.\n");
@@ -564,23 +568,21 @@ static void vmw_cmdbuf_work_func(struct work_struct *work)
cb_hdr->length -= new_start_offset;
cb_hdr->errorOffset = 0;
cb_hdr->offset = 0;
+
list_add_tail(&entry->list, &restart_head[entry->cb_context]);
- man->ctx[entry->cb_context].block_submission = true;
}
+
+ for_each_cmdbuf_ctx(man, i, ctx)
+ man->ctx[i].block_submission = true;
+
spin_unlock(&man->lock);
- /* Preempt all contexts with errors */
- for_each_cmdbuf_ctx(man, i, ctx) {
- if (ctx->block_submission && vmw_cmdbuf_preempt(man, i))
- DRM_ERROR("Failed preempting command buffer "
- "context %u.\n", i);
- }
+ /* Preempt all contexts */
+ if (global_block && vmw_cmdbuf_preempt(man, 0))
+ DRM_ERROR("Failed preempting command buffer contexts\n");
spin_lock(&man->lock);
for_each_cmdbuf_ctx(man, i, ctx) {
- if (!ctx->block_submission)
- continue;
-
/* Move preempted command buffers to the preempted queue. */
vmw_cmdbuf_ctx_process(man, ctx, &dummy);
@@ -594,19 +596,16 @@ static void vmw_cmdbuf_work_func(struct work_struct *work)
* Finally add all command buffers first in the submitted
* queue, to rerun them.
*/
- list_splice_init(&restart_head[i], &ctx->submitted);
ctx->block_submission = false;
+ list_splice_init(&restart_head[i], &ctx->submitted);
}
vmw_cmdbuf_man_process(man);
spin_unlock(&man->lock);
- for_each_cmdbuf_ctx(man, i, ctx) {
- if (restart[i] && vmw_cmdbuf_startstop(man, i, true))
- DRM_ERROR("Failed restarting command buffer "
- "context %u.\n", i);
- }
+ if (global_block && vmw_cmdbuf_startstop(man, 0, true))
+ DRM_ERROR("Failed restarting command buffer contexts\n");
/* Send a new fence in case one was removed */
if (send_fence) {
@@ -1307,6 +1306,8 @@ struct vmw_cmdbuf_man *vmw_cmdbuf_man_create(struct vmw_private *dev_priv)
if (!man)
return ERR_PTR(-ENOMEM);
+ man->num_contexts = (dev_priv->capabilities & SVGA_CAP_HP_CMD_QUEUE) ?
+ 2 : 1;
man->headers = dma_pool_create("vmwgfx cmdbuf",
&dev_priv->dev->pdev->dev,
sizeof(SVGACBHeader),
@@ -1341,14 +1342,11 @@ struct vmw_cmdbuf_man *vmw_cmdbuf_man_create(struct vmw_private *dev_priv)
INIT_WORK(&man->work, &vmw_cmdbuf_work_func);
vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_ERROR,
&dev_priv->error_waiters);
- for_each_cmdbuf_ctx(man, i, ctx) {
- ret = vmw_cmdbuf_startstop(man, i, true);
- if (ret) {
- DRM_ERROR("Failed starting command buffer "
- "context %u.\n", i);
- vmw_cmdbuf_man_destroy(man);
- return ERR_PTR(ret);
- }
+ ret = vmw_cmdbuf_startstop(man, 0, true);
+ if (ret) {
+ DRM_ERROR("Failed starting command buffer contexts\n");
+ vmw_cmdbuf_man_destroy(man);
+ return ERR_PTR(ret);
}
return man;
@@ -1398,16 +1396,11 @@ void vmw_cmdbuf_remove_pool(struct vmw_cmdbuf_man *man)
*/
void vmw_cmdbuf_man_destroy(struct vmw_cmdbuf_man *man)
{
- struct vmw_cmdbuf_context *ctx;
- unsigned int i;
-
WARN_ON_ONCE(man->has_pool);
(void) vmw_cmdbuf_idle(man, false, 10*HZ);
- for_each_cmdbuf_ctx(man, i, ctx)
- if (vmw_cmdbuf_startstop(man, i, false))
- DRM_ERROR("Failed stopping command buffer "
- "context %u.\n", i);
+ if (vmw_cmdbuf_startstop(man, 0, false))
+ DRM_ERROR("Failed stopping command buffer contexts.\n");
vmw_generic_waiter_remove(man->dev_priv, SVGA_IRQFLAG_ERROR,
&man->dev_priv->error_waiters);
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 184340d486c3..5055e5f68c4f 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -301,6 +301,8 @@ static void vmw_print_capabilities(uint32_t capabilities)
DRM_INFO(" Guest Backed Resources.\n");
if (capabilities & SVGA_CAP_DX)
DRM_INFO(" DX Features.\n");
+ if (capabilities & SVGA_CAP_HP_CMD_QUEUE)
+ DRM_INFO(" HP Command Queue.\n");
}
/**
--
2.14.3
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