0,0 → 1,1315 |
/************************************************************************** |
* |
* Copyright © 2015 VMware, Inc., Palo Alto, CA., USA |
* All Rights Reserved. |
* |
* Permission is hereby granted, free of charge, to any person obtaining a |
* copy of this software and associated documentation files (the |
* "Software"), to deal in the Software without restriction, including |
* without limitation the rights to use, copy, modify, merge, publish, |
* distribute, sub license, and/or sell copies of the Software, and to |
* permit persons to whom the Software is furnished to do so, subject to |
* the following conditions: |
* |
* The above copyright notice and this permission notice (including the |
* next paragraph) shall be included in all copies or substantial portions |
* of the Software. |
* |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
* USE OR OTHER DEALINGS IN THE SOFTWARE. |
* |
**************************************************************************/ |
|
#include "vmwgfx_drv.h" |
#include "ttm/ttm_bo_api.h" |
|
/* |
* Size of inline command buffers. Try to make sure that a page size is a |
* multiple of the DMA pool allocation size. |
*/ |
#define VMW_CMDBUF_INLINE_ALIGN 64 |
#define VMW_CMDBUF_INLINE_SIZE \ |
(1024 - ALIGN(sizeof(SVGACBHeader), VMW_CMDBUF_INLINE_ALIGN)) |
|
/** |
* struct vmw_cmdbuf_context - Command buffer context queues |
* |
* @submitted: List of command buffers that have been submitted to the |
* manager but not yet submitted to hardware. |
* @hw_submitted: List of command buffers submitted to hardware. |
* @preempted: List of preempted command buffers. |
* @num_hw_submitted: Number of buffers currently being processed by hardware |
*/ |
struct vmw_cmdbuf_context { |
struct list_head submitted; |
struct list_head hw_submitted; |
struct list_head preempted; |
unsigned num_hw_submitted; |
}; |
|
/** |
* struct vmw_cmdbuf_man: - Command buffer manager |
* |
* @cur_mutex: Mutex protecting the command buffer used for incremental small |
* kernel command submissions, @cur. |
* @space_mutex: Mutex to protect against starvation when we allocate |
* main pool buffer space. |
* @work: A struct work_struct implementeing command buffer error handling. |
* Immutable. |
* @dev_priv: Pointer to the device private struct. Immutable. |
* @ctx: Array of command buffer context queues. The queues and the context |
* data is protected by @lock. |
* @error: List of command buffers that have caused device errors. |
* Protected by @lock. |
* @mm: Range manager for the command buffer space. Manager allocations and |
* frees are protected by @lock. |
* @cmd_space: Buffer object for the command buffer space, unless we were |
* able to make a contigous coherent DMA memory allocation, @handle. Immutable. |
* @map_obj: Mapping state for @cmd_space. Immutable. |
* @map: Pointer to command buffer space. May be a mapped buffer object or |
* a contigous coherent DMA memory allocation. Immutable. |
* @cur: Command buffer for small kernel command submissions. Protected by |
* the @cur_mutex. |
* @cur_pos: Space already used in @cur. Protected by @cur_mutex. |
* @default_size: Default size for the @cur command buffer. Immutable. |
* @max_hw_submitted: Max number of in-flight command buffers the device can |
* handle. Immutable. |
* @lock: Spinlock protecting command submission queues. |
* @header: Pool of DMA memory for device command buffer headers. |
* Internal protection. |
* @dheaders: Pool of DMA memory for device command buffer headers with trailing |
* space for inline data. Internal protection. |
* @tasklet: Tasklet struct for irq processing. Immutable. |
* @alloc_queue: Wait queue for processes waiting to allocate command buffer |
* space. |
* @idle_queue: Wait queue for processes waiting for command buffer idle. |
* @irq_on: Whether the process function has requested irq to be turned on. |
* Protected by @lock. |
* @using_mob: Whether the command buffer space is a MOB or a contigous DMA |
* allocation. Immutable. |
* @has_pool: Has a large pool of DMA memory which allows larger allocations. |
* Typically this is false only during bootstrap. |
* @handle: DMA address handle for the command buffer space if @using_mob is |
* false. Immutable. |
* @size: The size of the command buffer space. Immutable. |
*/ |
struct vmw_cmdbuf_man { |
struct mutex cur_mutex; |
struct mutex space_mutex; |
struct work_struct work; |
struct vmw_private *dev_priv; |
struct vmw_cmdbuf_context ctx[SVGA_CB_CONTEXT_MAX]; |
struct list_head error; |
struct drm_mm mm; |
struct ttm_buffer_object *cmd_space; |
struct ttm_bo_kmap_obj map_obj; |
u8 *map; |
struct vmw_cmdbuf_header *cur; |
size_t cur_pos; |
size_t default_size; |
unsigned max_hw_submitted; |
spinlock_t lock; |
struct dma_pool *headers; |
struct dma_pool *dheaders; |
// struct tasklet_struct tasklet; |
wait_queue_head_t alloc_queue; |
wait_queue_head_t idle_queue; |
bool irq_on; |
bool using_mob; |
bool has_pool; |
dma_addr_t handle; |
size_t size; |
}; |
|
/** |
* struct vmw_cmdbuf_header - Command buffer metadata |
* |
* @man: The command buffer manager. |
* @cb_header: Device command buffer header, allocated from a DMA pool. |
* @cb_context: The device command buffer context. |
* @list: List head for attaching to the manager lists. |
* @node: The range manager node. |
* @handle. The DMA address of @cb_header. Handed to the device on command |
* buffer submission. |
* @cmd: Pointer to the command buffer space of this buffer. |
* @size: Size of the command buffer space of this buffer. |
* @reserved: Reserved space of this buffer. |
* @inline_space: Whether inline command buffer space is used. |
*/ |
struct vmw_cmdbuf_header { |
struct vmw_cmdbuf_man *man; |
SVGACBHeader *cb_header; |
SVGACBContext cb_context; |
struct list_head list; |
struct drm_mm_node node; |
dma_addr_t handle; |
u8 *cmd; |
size_t size; |
size_t reserved; |
bool inline_space; |
}; |
|
/** |
* struct vmw_cmdbuf_dheader - Device command buffer header with inline |
* command buffer space. |
* |
* @cb_header: Device command buffer header. |
* @cmd: Inline command buffer space. |
*/ |
struct vmw_cmdbuf_dheader { |
SVGACBHeader cb_header; |
u8 cmd[VMW_CMDBUF_INLINE_SIZE] __aligned(VMW_CMDBUF_INLINE_ALIGN); |
}; |
|
/** |
* struct vmw_cmdbuf_alloc_info - Command buffer space allocation metadata |
* |
* @page_size: Size of requested command buffer space in pages. |
* @node: Pointer to the range manager node. |
* @done: True if this allocation has succeeded. |
*/ |
struct vmw_cmdbuf_alloc_info { |
size_t page_size; |
struct drm_mm_node *node; |
bool done; |
}; |
|
/* 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; \ |
++(_i), ++(_ctx)) |
|
static int vmw_cmdbuf_startstop(struct vmw_cmdbuf_man *man, bool enable); |
|
|
/** |
* vmw_cmdbuf_cur_lock - Helper to lock the cur_mutex. |
* |
* @man: The range manager. |
* @interruptible: Whether to wait interruptible when locking. |
*/ |
static int vmw_cmdbuf_cur_lock(struct vmw_cmdbuf_man *man, bool interruptible) |
{ |
if (interruptible) { |
if (mutex_lock_interruptible(&man->cur_mutex)) |
return -ERESTARTSYS; |
} else { |
mutex_lock(&man->cur_mutex); |
} |
|
return 0; |
} |
|
/** |
* vmw_cmdbuf_cur_unlock - Helper to unlock the cur_mutex. |
* |
* @man: The range manager. |
*/ |
static void vmw_cmdbuf_cur_unlock(struct vmw_cmdbuf_man *man) |
{ |
mutex_unlock(&man->cur_mutex); |
} |
|
/** |
* vmw_cmdbuf_header_inline_free - Free a struct vmw_cmdbuf_header that has |
* been used for the device context with inline command buffers. |
* Need not be called locked. |
* |
* @header: Pointer to the header to free. |
*/ |
static void vmw_cmdbuf_header_inline_free(struct vmw_cmdbuf_header *header) |
{ |
struct vmw_cmdbuf_dheader *dheader; |
|
if (WARN_ON_ONCE(!header->inline_space)) |
return; |
|
dheader = container_of(header->cb_header, struct vmw_cmdbuf_dheader, |
cb_header); |
dma_pool_free(header->man->dheaders, dheader, header->handle); |
kfree(header); |
} |
|
/** |
* __vmw_cmdbuf_header_free - Free a struct vmw_cmdbuf_header and its |
* associated structures. |
* |
* header: Pointer to the header to free. |
* |
* For internal use. Must be called with man::lock held. |
*/ |
static void __vmw_cmdbuf_header_free(struct vmw_cmdbuf_header *header) |
{ |
struct vmw_cmdbuf_man *man = header->man; |
|
if (header->inline_space) { |
vmw_cmdbuf_header_inline_free(header); |
return; |
} |
|
drm_mm_remove_node(&header->node); |
wake_up_all(&man->alloc_queue); |
if (header->cb_header) |
dma_pool_free(man->headers, header->cb_header, |
header->handle); |
kfree(header); |
} |
|
/** |
* vmw_cmdbuf_header_free - Free a struct vmw_cmdbuf_header and its |
* associated structures. |
* |
* @header: Pointer to the header to free. |
*/ |
void vmw_cmdbuf_header_free(struct vmw_cmdbuf_header *header) |
{ |
struct vmw_cmdbuf_man *man = header->man; |
|
/* Avoid locking if inline_space */ |
if (header->inline_space) { |
vmw_cmdbuf_header_inline_free(header); |
return; |
} |
spin_lock(&man->lock); |
__vmw_cmdbuf_header_free(header); |
spin_unlock(&man->lock); |
} |
|
|
/** |
* vmw_cmbuf_header_submit: Submit a command buffer to hardware. |
* |
* @header: The header of the buffer to submit. |
*/ |
static int vmw_cmdbuf_header_submit(struct vmw_cmdbuf_header *header) |
{ |
struct vmw_cmdbuf_man *man = header->man; |
u32 val; |
|
if (sizeof(header->handle) > 4) |
val = (header->handle >> 32); |
else |
val = 0; |
vmw_write(man->dev_priv, SVGA_REG_COMMAND_HIGH, val); |
|
val = (header->handle & 0xFFFFFFFFULL); |
val |= header->cb_context & SVGA_CB_CONTEXT_MASK; |
vmw_write(man->dev_priv, SVGA_REG_COMMAND_LOW, val); |
|
return header->cb_header->status; |
} |
|
/** |
* vmw_cmdbuf_ctx_init: Initialize a command buffer context. |
* |
* @ctx: The command buffer context to initialize |
*/ |
static void vmw_cmdbuf_ctx_init(struct vmw_cmdbuf_context *ctx) |
{ |
INIT_LIST_HEAD(&ctx->hw_submitted); |
INIT_LIST_HEAD(&ctx->submitted); |
INIT_LIST_HEAD(&ctx->preempted); |
ctx->num_hw_submitted = 0; |
} |
|
/** |
* vmw_cmdbuf_ctx_submit: Submit command buffers from a command buffer |
* context. |
* |
* @man: The command buffer manager. |
* @ctx: The command buffer context. |
* |
* Submits command buffers to hardware until there are no more command |
* buffers to submit or the hardware can't handle more command buffers. |
*/ |
static void vmw_cmdbuf_ctx_submit(struct vmw_cmdbuf_man *man, |
struct vmw_cmdbuf_context *ctx) |
{ |
while (ctx->num_hw_submitted < man->max_hw_submitted && |
!list_empty(&ctx->submitted)) { |
struct vmw_cmdbuf_header *entry; |
SVGACBStatus status; |
|
entry = list_first_entry(&ctx->submitted, |
struct vmw_cmdbuf_header, |
list); |
|
status = vmw_cmdbuf_header_submit(entry); |
|
/* This should never happen */ |
if (WARN_ON_ONCE(status == SVGA_CB_STATUS_QUEUE_FULL)) { |
entry->cb_header->status = SVGA_CB_STATUS_NONE; |
break; |
} |
|
list_del(&entry->list); |
list_add_tail(&entry->list, &ctx->hw_submitted); |
ctx->num_hw_submitted++; |
} |
|
} |
|
/** |
* vmw_cmdbuf_ctx_submit: Process a command buffer context. |
* |
* @man: The command buffer manager. |
* @ctx: The command buffer context. |
* |
* Submit command buffers to hardware if possible, and process finished |
* buffers. Typically freeing them, but on preemption or error take |
* appropriate action. Wake up waiters if appropriate. |
*/ |
static void vmw_cmdbuf_ctx_process(struct vmw_cmdbuf_man *man, |
struct vmw_cmdbuf_context *ctx, |
int *notempty) |
{ |
struct vmw_cmdbuf_header *entry, *next; |
|
vmw_cmdbuf_ctx_submit(man, ctx); |
|
list_for_each_entry_safe(entry, next, &ctx->hw_submitted, list) { |
SVGACBStatus status = entry->cb_header->status; |
|
if (status == SVGA_CB_STATUS_NONE) |
break; |
|
list_del(&entry->list); |
wake_up_all(&man->idle_queue); |
ctx->num_hw_submitted--; |
switch (status) { |
case SVGA_CB_STATUS_COMPLETED: |
__vmw_cmdbuf_header_free(entry); |
break; |
case SVGA_CB_STATUS_COMMAND_ERROR: |
case SVGA_CB_STATUS_CB_HEADER_ERROR: |
list_add_tail(&entry->list, &man->error); |
schedule_work(&man->work); |
break; |
case SVGA_CB_STATUS_PREEMPTED: |
list_add(&entry->list, &ctx->preempted); |
break; |
default: |
WARN_ONCE(true, "Undefined command buffer status.\n"); |
__vmw_cmdbuf_header_free(entry); |
break; |
} |
} |
|
vmw_cmdbuf_ctx_submit(man, ctx); |
if (!list_empty(&ctx->submitted)) |
(*notempty)++; |
} |
|
/** |
* vmw_cmdbuf_man_process - Process all command buffer contexts and |
* switch on and off irqs as appropriate. |
* |
* @man: The command buffer manager. |
* |
* Calls vmw_cmdbuf_ctx_process() on all contexts. If any context has |
* command buffers left that are not submitted to hardware, Make sure |
* IRQ handling is turned on. Otherwise, make sure it's turned off. |
*/ |
static void vmw_cmdbuf_man_process(struct vmw_cmdbuf_man *man) |
{ |
int notempty; |
struct vmw_cmdbuf_context *ctx; |
int i; |
|
retry: |
notempty = 0; |
for_each_cmdbuf_ctx(man, i, ctx) |
vmw_cmdbuf_ctx_process(man, ctx, ¬empty); |
|
if (man->irq_on && !notempty) { |
vmw_generic_waiter_remove(man->dev_priv, |
SVGA_IRQFLAG_COMMAND_BUFFER, |
&man->dev_priv->cmdbuf_waiters); |
man->irq_on = false; |
} else if (!man->irq_on && notempty) { |
vmw_generic_waiter_add(man->dev_priv, |
SVGA_IRQFLAG_COMMAND_BUFFER, |
&man->dev_priv->cmdbuf_waiters); |
man->irq_on = true; |
|
/* Rerun in case we just missed an irq. */ |
goto retry; |
} |
} |
|
/** |
* vmw_cmdbuf_ctx_add - Schedule a command buffer for submission on a |
* command buffer context |
* |
* @man: The command buffer manager. |
* @header: The header of the buffer to submit. |
* @cb_context: The command buffer context to use. |
* |
* This function adds @header to the "submitted" queue of the command |
* buffer context identified by @cb_context. It then calls the command buffer |
* manager processing to potentially submit the buffer to hardware. |
* @man->lock needs to be held when calling this function. |
*/ |
static void vmw_cmdbuf_ctx_add(struct vmw_cmdbuf_man *man, |
struct vmw_cmdbuf_header *header, |
SVGACBContext cb_context) |
{ |
if (!(header->cb_header->flags & SVGA_CB_FLAG_DX_CONTEXT)) |
header->cb_header->dxContext = 0; |
header->cb_context = cb_context; |
list_add_tail(&header->list, &man->ctx[cb_context].submitted); |
|
vmw_cmdbuf_man_process(man); |
} |
|
/** |
* vmw_cmdbuf_man_tasklet - The main part of the command buffer interrupt |
* handler implemented as a tasklet. |
* |
* @data: Tasklet closure. A pointer to the command buffer manager cast to |
* an unsigned long. |
* |
* The bottom half (tasklet) of the interrupt handler simply calls into the |
* command buffer processor to free finished buffers and submit any |
* queued buffers to hardware. |
*/ |
static void vmw_cmdbuf_man_tasklet(unsigned long data) |
{ |
struct vmw_cmdbuf_man *man = (struct vmw_cmdbuf_man *) data; |
|
spin_lock(&man->lock); |
vmw_cmdbuf_man_process(man); |
spin_unlock(&man->lock); |
} |
|
/** |
* vmw_cmdbuf_work_func - The deferred work function that handles |
* command buffer errors. |
* |
* @work: The work func closure argument. |
* |
* Restarting the command buffer context after an error requires process |
* context, so it is deferred to this work function. |
*/ |
static void vmw_cmdbuf_work_func(struct work_struct *work) |
{ |
struct vmw_cmdbuf_man *man = |
container_of(work, struct vmw_cmdbuf_man, work); |
struct vmw_cmdbuf_header *entry, *next; |
uint32_t dummy; |
bool restart = false; |
|
spin_lock(&man->lock); |
list_for_each_entry_safe(entry, next, &man->error, list) { |
restart = true; |
DRM_ERROR("Command buffer error.\n"); |
|
list_del(&entry->list); |
__vmw_cmdbuf_header_free(entry); |
wake_up_all(&man->idle_queue); |
} |
spin_unlock(&man->lock); |
|
if (restart && vmw_cmdbuf_startstop(man, true)) |
DRM_ERROR("Failed restarting command buffer context 0.\n"); |
|
/* Send a new fence in case one was removed */ |
vmw_fifo_send_fence(man->dev_priv, &dummy); |
} |
|
/** |
* vmw_cmdbuf_man idle - Check whether the command buffer manager is idle. |
* |
* @man: The command buffer manager. |
* @check_preempted: Check also the preempted queue for pending command buffers. |
* |
*/ |
static bool vmw_cmdbuf_man_idle(struct vmw_cmdbuf_man *man, |
bool check_preempted) |
{ |
struct vmw_cmdbuf_context *ctx; |
bool idle = false; |
int i; |
|
spin_lock(&man->lock); |
vmw_cmdbuf_man_process(man); |
for_each_cmdbuf_ctx(man, i, ctx) { |
if (!list_empty(&ctx->submitted) || |
!list_empty(&ctx->hw_submitted) || |
(check_preempted && !list_empty(&ctx->preempted))) |
goto out_unlock; |
} |
|
idle = list_empty(&man->error); |
|
out_unlock: |
spin_unlock(&man->lock); |
|
return idle; |
} |
|
/** |
* __vmw_cmdbuf_cur_flush - Flush the current command buffer for small kernel |
* command submissions |
* |
* @man: The command buffer manager. |
* |
* Flushes the current command buffer without allocating a new one. A new one |
* is automatically allocated when needed. Call with @man->cur_mutex held. |
*/ |
static void __vmw_cmdbuf_cur_flush(struct vmw_cmdbuf_man *man) |
{ |
struct vmw_cmdbuf_header *cur = man->cur; |
|
WARN_ON(!mutex_is_locked(&man->cur_mutex)); |
|
if (!cur) |
return; |
|
spin_lock(&man->lock); |
if (man->cur_pos == 0) { |
__vmw_cmdbuf_header_free(cur); |
goto out_unlock; |
} |
|
man->cur->cb_header->length = man->cur_pos; |
vmw_cmdbuf_ctx_add(man, man->cur, SVGA_CB_CONTEXT_0); |
out_unlock: |
spin_unlock(&man->lock); |
man->cur = NULL; |
man->cur_pos = 0; |
} |
|
/** |
* vmw_cmdbuf_cur_flush - Flush the current command buffer for small kernel |
* command submissions |
* |
* @man: The command buffer manager. |
* @interruptible: Whether to sleep interruptible when sleeping. |
* |
* Flushes the current command buffer without allocating a new one. A new one |
* is automatically allocated when needed. |
*/ |
int vmw_cmdbuf_cur_flush(struct vmw_cmdbuf_man *man, |
bool interruptible) |
{ |
int ret = vmw_cmdbuf_cur_lock(man, interruptible); |
|
if (ret) |
return ret; |
|
__vmw_cmdbuf_cur_flush(man); |
vmw_cmdbuf_cur_unlock(man); |
|
return 0; |
} |
|
/** |
* vmw_cmdbuf_idle - Wait for command buffer manager idle. |
* |
* @man: The command buffer manager. |
* @interruptible: Sleep interruptible while waiting. |
* @timeout: Time out after this many ticks. |
* |
* Wait until the command buffer manager has processed all command buffers, |
* or until a timeout occurs. If a timeout occurs, the function will return |
* -EBUSY. |
*/ |
int vmw_cmdbuf_idle(struct vmw_cmdbuf_man *man, bool interruptible, |
unsigned long timeout) |
{ |
int ret; |
|
ret = vmw_cmdbuf_cur_flush(man, interruptible); |
vmw_generic_waiter_add(man->dev_priv, |
SVGA_IRQFLAG_COMMAND_BUFFER, |
&man->dev_priv->cmdbuf_waiters); |
|
if (interruptible) { |
ret = wait_event_interruptible_timeout |
(man->idle_queue, vmw_cmdbuf_man_idle(man, true), |
timeout); |
} else { |
ret = wait_event_timeout |
(man->idle_queue, vmw_cmdbuf_man_idle(man, true), |
timeout); |
} |
vmw_generic_waiter_remove(man->dev_priv, |
SVGA_IRQFLAG_COMMAND_BUFFER, |
&man->dev_priv->cmdbuf_waiters); |
if (ret == 0) { |
if (!vmw_cmdbuf_man_idle(man, true)) |
ret = -EBUSY; |
else |
ret = 0; |
} |
if (ret > 0) |
ret = 0; |
|
return ret; |
} |
|
/** |
* vmw_cmdbuf_try_alloc - Try to allocate buffer space from the main pool. |
* |
* @man: The command buffer manager. |
* @info: Allocation info. Will hold the size on entry and allocated mm node |
* on successful return. |
* |
* Try to allocate buffer space from the main pool. Returns true if succeeded. |
* If a fatal error was hit, the error code is returned in @info->ret. |
*/ |
static bool vmw_cmdbuf_try_alloc(struct vmw_cmdbuf_man *man, |
struct vmw_cmdbuf_alloc_info *info) |
{ |
int ret; |
|
if (info->done) |
return true; |
|
memset(info->node, 0, sizeof(*info->node)); |
spin_lock(&man->lock); |
ret = drm_mm_insert_node_generic(&man->mm, info->node, info->page_size, |
0, 0, |
DRM_MM_SEARCH_DEFAULT, |
DRM_MM_CREATE_DEFAULT); |
if (ret) { |
vmw_cmdbuf_man_process(man); |
ret = drm_mm_insert_node_generic(&man->mm, info->node, |
info->page_size, 0, 0, |
DRM_MM_SEARCH_DEFAULT, |
DRM_MM_CREATE_DEFAULT); |
} |
|
spin_unlock(&man->lock); |
info->done = !ret; |
|
return info->done; |
} |
|
/** |
* vmw_cmdbuf_alloc_space - Allocate buffer space from the main pool. |
* |
* @man: The command buffer manager. |
* @node: Pointer to pre-allocated range-manager node. |
* @size: The size of the allocation. |
* @interruptible: Whether to sleep interruptible while waiting for space. |
* |
* This function allocates buffer space from the main pool, and if there is |
* no space available ATM, it turns on IRQ handling and sleeps waiting for it to |
* become available. |
*/ |
static int vmw_cmdbuf_alloc_space(struct vmw_cmdbuf_man *man, |
struct drm_mm_node *node, |
size_t size, |
bool interruptible) |
{ |
struct vmw_cmdbuf_alloc_info info; |
|
info.page_size = PAGE_ALIGN(size) >> PAGE_SHIFT; |
info.node = node; |
info.done = false; |
|
/* |
* To prevent starvation of large requests, only one allocating call |
* at a time waiting for space. |
*/ |
if (interruptible) { |
if (mutex_lock_interruptible(&man->space_mutex)) |
return -ERESTARTSYS; |
} else { |
mutex_lock(&man->space_mutex); |
} |
|
/* Try to allocate space without waiting. */ |
if (vmw_cmdbuf_try_alloc(man, &info)) |
goto out_unlock; |
|
vmw_generic_waiter_add(man->dev_priv, |
SVGA_IRQFLAG_COMMAND_BUFFER, |
&man->dev_priv->cmdbuf_waiters); |
|
if (interruptible) { |
int ret; |
|
ret = wait_event_interruptible |
(man->alloc_queue, vmw_cmdbuf_try_alloc(man, &info)); |
if (ret) { |
vmw_generic_waiter_remove |
(man->dev_priv, SVGA_IRQFLAG_COMMAND_BUFFER, |
&man->dev_priv->cmdbuf_waiters); |
mutex_unlock(&man->space_mutex); |
return ret; |
} |
} else { |
wait_event(man->alloc_queue, vmw_cmdbuf_try_alloc(man, &info)); |
} |
vmw_generic_waiter_remove(man->dev_priv, |
SVGA_IRQFLAG_COMMAND_BUFFER, |
&man->dev_priv->cmdbuf_waiters); |
|
out_unlock: |
mutex_unlock(&man->space_mutex); |
|
return 0; |
} |
|
/** |
* vmw_cmdbuf_space_pool - Set up a command buffer header with command buffer |
* space from the main pool. |
* |
* @man: The command buffer manager. |
* @header: Pointer to the header to set up. |
* @size: The requested size of the buffer space. |
* @interruptible: Whether to sleep interruptible while waiting for space. |
*/ |
static int vmw_cmdbuf_space_pool(struct vmw_cmdbuf_man *man, |
struct vmw_cmdbuf_header *header, |
size_t size, |
bool interruptible) |
{ |
SVGACBHeader *cb_hdr; |
size_t offset; |
int ret; |
|
if (!man->has_pool) |
return -ENOMEM; |
|
ret = vmw_cmdbuf_alloc_space(man, &header->node, size, interruptible); |
|
if (ret) |
return ret; |
|
header->cb_header = dma_pool_alloc(man->headers, GFP_KERNEL, |
&header->handle); |
if (!header->cb_header) { |
ret = -ENOMEM; |
goto out_no_cb_header; |
} |
|
header->size = header->node.size << PAGE_SHIFT; |
cb_hdr = header->cb_header; |
offset = header->node.start << PAGE_SHIFT; |
header->cmd = man->map + offset; |
memset(cb_hdr, 0, sizeof(*cb_hdr)); |
if (man->using_mob) { |
cb_hdr->flags = SVGA_CB_FLAG_MOB; |
cb_hdr->ptr.mob.mobid = man->cmd_space->mem.start; |
cb_hdr->ptr.mob.mobOffset = offset; |
} else { |
cb_hdr->ptr.pa = (u64)man->handle + (u64)offset; |
} |
|
return 0; |
|
out_no_cb_header: |
spin_lock(&man->lock); |
drm_mm_remove_node(&header->node); |
spin_unlock(&man->lock); |
|
return ret; |
} |
|
/** |
* vmw_cmdbuf_space_inline - Set up a command buffer header with |
* inline command buffer space. |
* |
* @man: The command buffer manager. |
* @header: Pointer to the header to set up. |
* @size: The requested size of the buffer space. |
*/ |
static int vmw_cmdbuf_space_inline(struct vmw_cmdbuf_man *man, |
struct vmw_cmdbuf_header *header, |
int size) |
{ |
struct vmw_cmdbuf_dheader *dheader; |
SVGACBHeader *cb_hdr; |
|
if (WARN_ON_ONCE(size > VMW_CMDBUF_INLINE_SIZE)) |
return -ENOMEM; |
|
dheader = dma_pool_alloc(man->dheaders, GFP_KERNEL, |
&header->handle); |
if (!dheader) |
return -ENOMEM; |
|
header->inline_space = true; |
header->size = VMW_CMDBUF_INLINE_SIZE; |
cb_hdr = &dheader->cb_header; |
header->cb_header = cb_hdr; |
header->cmd = dheader->cmd; |
memset(dheader, 0, sizeof(*dheader)); |
cb_hdr->status = SVGA_CB_STATUS_NONE; |
cb_hdr->flags = SVGA_CB_FLAG_NONE; |
cb_hdr->ptr.pa = (u64)header->handle + |
(u64)offsetof(struct vmw_cmdbuf_dheader, cmd); |
|
return 0; |
} |
|
/** |
* vmw_cmdbuf_alloc - Allocate a command buffer header complete with |
* command buffer space. |
* |
* @man: The command buffer manager. |
* @size: The requested size of the buffer space. |
* @interruptible: Whether to sleep interruptible while waiting for space. |
* @p_header: points to a header pointer to populate on successful return. |
* |
* Returns a pointer to command buffer space if successful. Otherwise |
* returns an error pointer. The header pointer returned in @p_header should |
* be used for upcoming calls to vmw_cmdbuf_reserve() and vmw_cmdbuf_commit(). |
*/ |
void *vmw_cmdbuf_alloc(struct vmw_cmdbuf_man *man, |
size_t size, bool interruptible, |
struct vmw_cmdbuf_header **p_header) |
{ |
struct vmw_cmdbuf_header *header; |
int ret = 0; |
|
*p_header = NULL; |
|
header = kzalloc(sizeof(*header), GFP_KERNEL); |
if (!header) |
return ERR_PTR(-ENOMEM); |
|
if (size <= VMW_CMDBUF_INLINE_SIZE) |
ret = vmw_cmdbuf_space_inline(man, header, size); |
else |
ret = vmw_cmdbuf_space_pool(man, header, size, interruptible); |
|
if (ret) { |
kfree(header); |
return ERR_PTR(ret); |
} |
|
header->man = man; |
INIT_LIST_HEAD(&header->list); |
header->cb_header->status = SVGA_CB_STATUS_NONE; |
*p_header = header; |
|
return header->cmd; |
} |
|
/** |
* vmw_cmdbuf_reserve_cur - Reserve space for commands in the current |
* command buffer. |
* |
* @man: The command buffer manager. |
* @size: The requested size of the commands. |
* @ctx_id: The context id if any. Otherwise set to SVGA3D_REG_INVALID. |
* @interruptible: Whether to sleep interruptible while waiting for space. |
* |
* Returns a pointer to command buffer space if successful. Otherwise |
* returns an error pointer. |
*/ |
static void *vmw_cmdbuf_reserve_cur(struct vmw_cmdbuf_man *man, |
size_t size, |
int ctx_id, |
bool interruptible) |
{ |
struct vmw_cmdbuf_header *cur; |
void *ret; |
|
if (vmw_cmdbuf_cur_lock(man, interruptible)) |
return ERR_PTR(-ERESTARTSYS); |
|
cur = man->cur; |
if (cur && (size + man->cur_pos > cur->size || |
((cur->cb_header->flags & SVGA_CB_FLAG_DX_CONTEXT) && |
ctx_id != cur->cb_header->dxContext))) |
__vmw_cmdbuf_cur_flush(man); |
|
if (!man->cur) { |
ret = vmw_cmdbuf_alloc(man, |
max_t(size_t, size, man->default_size), |
interruptible, &man->cur); |
if (IS_ERR(ret)) { |
vmw_cmdbuf_cur_unlock(man); |
return ret; |
} |
|
cur = man->cur; |
} |
|
if (ctx_id != SVGA3D_INVALID_ID) { |
cur->cb_header->flags |= SVGA_CB_FLAG_DX_CONTEXT; |
cur->cb_header->dxContext = ctx_id; |
} |
|
cur->reserved = size; |
|
return (void *) (man->cur->cmd + man->cur_pos); |
} |
|
/** |
* vmw_cmdbuf_commit_cur - Commit commands in the current command buffer. |
* |
* @man: The command buffer manager. |
* @size: The size of the commands actually written. |
* @flush: Whether to flush the command buffer immediately. |
*/ |
static void vmw_cmdbuf_commit_cur(struct vmw_cmdbuf_man *man, |
size_t size, bool flush) |
{ |
struct vmw_cmdbuf_header *cur = man->cur; |
|
WARN_ON(!mutex_is_locked(&man->cur_mutex)); |
|
WARN_ON(size > cur->reserved); |
man->cur_pos += size; |
if (!size) |
cur->cb_header->flags &= ~SVGA_CB_FLAG_DX_CONTEXT; |
if (flush) |
__vmw_cmdbuf_cur_flush(man); |
vmw_cmdbuf_cur_unlock(man); |
} |
|
/** |
* vmw_cmdbuf_reserve - Reserve space for commands in a command buffer. |
* |
* @man: The command buffer manager. |
* @size: The requested size of the commands. |
* @ctx_id: The context id if any. Otherwise set to SVGA3D_REG_INVALID. |
* @interruptible: Whether to sleep interruptible while waiting for space. |
* @header: Header of the command buffer. NULL if the current command buffer |
* should be used. |
* |
* Returns a pointer to command buffer space if successful. Otherwise |
* returns an error pointer. |
*/ |
void *vmw_cmdbuf_reserve(struct vmw_cmdbuf_man *man, size_t size, |
int ctx_id, bool interruptible, |
struct vmw_cmdbuf_header *header) |
{ |
if (!header) |
return vmw_cmdbuf_reserve_cur(man, size, ctx_id, interruptible); |
|
if (size > header->size) |
return ERR_PTR(-EINVAL); |
|
if (ctx_id != SVGA3D_INVALID_ID) { |
header->cb_header->flags |= SVGA_CB_FLAG_DX_CONTEXT; |
header->cb_header->dxContext = ctx_id; |
} |
|
header->reserved = size; |
return header->cmd; |
} |
|
/** |
* vmw_cmdbuf_commit - Commit commands in a command buffer. |
* |
* @man: The command buffer manager. |
* @size: The size of the commands actually written. |
* @header: Header of the command buffer. NULL if the current command buffer |
* should be used. |
* @flush: Whether to flush the command buffer immediately. |
*/ |
void vmw_cmdbuf_commit(struct vmw_cmdbuf_man *man, size_t size, |
struct vmw_cmdbuf_header *header, bool flush) |
{ |
if (!header) { |
vmw_cmdbuf_commit_cur(man, size, flush); |
return; |
} |
|
(void) vmw_cmdbuf_cur_lock(man, false); |
__vmw_cmdbuf_cur_flush(man); |
WARN_ON(size > header->reserved); |
man->cur = header; |
man->cur_pos = size; |
if (!size) |
header->cb_header->flags &= ~SVGA_CB_FLAG_DX_CONTEXT; |
if (flush) |
__vmw_cmdbuf_cur_flush(man); |
vmw_cmdbuf_cur_unlock(man); |
} |
|
/** |
* vmw_cmdbuf_tasklet_schedule - Schedule the interrupt handler bottom half. |
* |
* @man: The command buffer manager. |
*/ |
void vmw_cmdbuf_tasklet_schedule(struct vmw_cmdbuf_man *man) |
{ |
if (!man) |
return; |
|
// tasklet_schedule(&man->tasklet); |
} |
|
/** |
* vmw_cmdbuf_send_device_command - Send a command through the device context. |
* |
* @man: The command buffer manager. |
* @command: Pointer to the command to send. |
* @size: Size of the command. |
* |
* Synchronously sends a device context command. |
*/ |
static int vmw_cmdbuf_send_device_command(struct vmw_cmdbuf_man *man, |
const void *command, |
size_t size) |
{ |
struct vmw_cmdbuf_header *header; |
int status; |
void *cmd = vmw_cmdbuf_alloc(man, size, false, &header); |
|
if (IS_ERR(cmd)) |
return PTR_ERR(cmd); |
|
memcpy(cmd, command, size); |
header->cb_header->length = size; |
header->cb_context = SVGA_CB_CONTEXT_DEVICE; |
spin_lock(&man->lock); |
status = vmw_cmdbuf_header_submit(header); |
spin_unlock(&man->lock); |
vmw_cmdbuf_header_free(header); |
|
if (status != SVGA_CB_STATUS_COMPLETED) { |
DRM_ERROR("Device context command failed with status %d\n", |
status); |
return -EINVAL; |
} |
|
return 0; |
} |
|
/** |
* vmw_cmdbuf_startstop - Send a start / stop command through the device |
* context. |
* |
* @man: The command buffer manager. |
* @enable: Whether to enable or disable the context. |
* |
* Synchronously sends a device start / stop context command. |
*/ |
static int vmw_cmdbuf_startstop(struct vmw_cmdbuf_man *man, |
bool enable) |
{ |
struct { |
uint32 id; |
SVGADCCmdStartStop body; |
} __packed cmd; |
|
cmd.id = SVGA_DC_CMD_START_STOP_CONTEXT; |
cmd.body.enable = (enable) ? 1 : 0; |
cmd.body.context = SVGA_CB_CONTEXT_0; |
|
return vmw_cmdbuf_send_device_command(man, &cmd, sizeof(cmd)); |
} |
|
/** |
* vmw_cmdbuf_set_pool_size - Set command buffer manager sizes |
* |
* @man: The command buffer manager. |
* @size: The size of the main space pool. |
* @default_size: The default size of the command buffer for small kernel |
* submissions. |
* |
* Set the size and allocate the main command buffer space pool, |
* as well as the default size of the command buffer for |
* small kernel submissions. If successful, this enables large command |
* submissions. Note that this function requires that rudimentary command |
* submission is already available and that the MOB memory manager is alive. |
* Returns 0 on success. Negative error code on failure. |
*/ |
int vmw_cmdbuf_set_pool_size(struct vmw_cmdbuf_man *man, |
size_t size, size_t default_size) |
{ |
struct vmw_private *dev_priv = man->dev_priv; |
bool dummy; |
int ret; |
|
if (man->has_pool) |
return -EINVAL; |
|
/* First, try to allocate a huge chunk of DMA memory */ |
size = PAGE_ALIGN(size); |
man->map = dma_alloc_coherent(&dev_priv->dev->pdev->dev, size, |
&man->handle, GFP_KERNEL); |
if (man->map) { |
man->using_mob = false; |
} else { |
/* |
* DMA memory failed. If we can have command buffers in a |
* MOB, try to use that instead. Note that this will |
* actually call into the already enabled manager, when |
* binding the MOB. |
*/ |
if (!(dev_priv->capabilities & SVGA_CAP_DX)) |
return -ENOMEM; |
|
ret = ttm_bo_create(&dev_priv->bdev, size, ttm_bo_type_device, |
&vmw_mob_ne_placement, 0, false, NULL, |
&man->cmd_space); |
if (ret) |
return ret; |
|
man->using_mob = true; |
ret = ttm_bo_kmap(man->cmd_space, 0, size >> PAGE_SHIFT, |
&man->map_obj); |
if (ret) |
goto out_no_map; |
|
man->map = ttm_kmap_obj_virtual(&man->map_obj, &dummy); |
} |
|
man->size = size; |
drm_mm_init(&man->mm, 0, size >> PAGE_SHIFT); |
|
man->has_pool = true; |
|
/* |
* For now, set the default size to VMW_CMDBUF_INLINE_SIZE to |
* prevent deadlocks from happening when vmw_cmdbuf_space_pool() |
* needs to wait for space and we block on further command |
* submissions to be able to free up space. |
*/ |
man->default_size = VMW_CMDBUF_INLINE_SIZE; |
DRM_INFO("Using command buffers with %s pool.\n", |
(man->using_mob) ? "MOB" : "DMA"); |
|
return 0; |
|
out_no_map: |
if (man->using_mob) |
ttm_bo_unref(&man->cmd_space); |
|
return ret; |
} |
|
/** |
* vmw_cmdbuf_man_create: Create a command buffer manager and enable it for |
* inline command buffer submissions only. |
* |
* @dev_priv: Pointer to device private structure. |
* |
* Returns a pointer to a cummand buffer manager to success or error pointer |
* on failure. The command buffer manager will be enabled for submissions of |
* size VMW_CMDBUF_INLINE_SIZE only. |
*/ |
struct vmw_cmdbuf_man *vmw_cmdbuf_man_create(struct vmw_private *dev_priv) |
{ |
struct vmw_cmdbuf_man *man; |
struct vmw_cmdbuf_context *ctx; |
int i; |
int ret; |
|
if (!(dev_priv->capabilities & SVGA_CAP_COMMAND_BUFFERS)) |
return ERR_PTR(-ENOSYS); |
|
man = kzalloc(sizeof(*man), GFP_KERNEL); |
if (!man) |
return ERR_PTR(-ENOMEM); |
|
man->headers = dma_pool_create("vmwgfx cmdbuf", |
&dev_priv->dev->pdev->dev, |
sizeof(SVGACBHeader), |
64, PAGE_SIZE); |
if (!man->headers) { |
ret = -ENOMEM; |
goto out_no_pool; |
} |
|
man->dheaders = dma_pool_create("vmwgfx inline cmdbuf", |
&dev_priv->dev->pdev->dev, |
sizeof(struct vmw_cmdbuf_dheader), |
64, PAGE_SIZE); |
if (!man->dheaders) { |
ret = -ENOMEM; |
goto out_no_dpool; |
} |
|
for_each_cmdbuf_ctx(man, i, ctx) |
vmw_cmdbuf_ctx_init(ctx); |
|
INIT_LIST_HEAD(&man->error); |
spin_lock_init(&man->lock); |
mutex_init(&man->cur_mutex); |
mutex_init(&man->space_mutex); |
// tasklet_init(&man->tasklet, vmw_cmdbuf_man_tasklet, |
// (unsigned long) man); |
man->default_size = VMW_CMDBUF_INLINE_SIZE; |
init_waitqueue_head(&man->alloc_queue); |
init_waitqueue_head(&man->idle_queue); |
man->dev_priv = dev_priv; |
man->max_hw_submitted = SVGA_CB_MAX_QUEUED_PER_CONTEXT - 1; |
INIT_WORK(&man->work, &vmw_cmdbuf_work_func); |
vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_ERROR, |
&dev_priv->error_waiters); |
ret = vmw_cmdbuf_startstop(man, true); |
if (ret) { |
DRM_ERROR("Failed starting command buffer context 0.\n"); |
vmw_cmdbuf_man_destroy(man); |
return ERR_PTR(ret); |
} |
|
return man; |
|
out_no_dpool: |
dma_pool_destroy(man->headers); |
out_no_pool: |
kfree(man); |
|
return ERR_PTR(ret); |
} |
|
/** |
* vmw_cmdbuf_remove_pool - Take down the main buffer space pool. |
* |
* @man: Pointer to a command buffer manager. |
* |
* This function removes the main buffer space pool, and should be called |
* before MOB memory management is removed. When this function has been called, |
* only small command buffer submissions of size VMW_CMDBUF_INLINE_SIZE or |
* less are allowed, and the default size of the command buffer for small kernel |
* submissions is also set to this size. |
*/ |
void vmw_cmdbuf_remove_pool(struct vmw_cmdbuf_man *man) |
{ |
if (!man->has_pool) |
return; |
|
man->has_pool = false; |
man->default_size = VMW_CMDBUF_INLINE_SIZE; |
(void) vmw_cmdbuf_idle(man, false, 10*HZ); |
if (man->using_mob) { |
(void) ttm_bo_kunmap(&man->map_obj); |
ttm_bo_unref(&man->cmd_space); |
} else { |
// dma_free_coherent(&man->dev_priv->dev->pdev->dev, |
// man->size, man->map, man->handle); |
} |
} |
|
/** |
* vmw_cmdbuf_man_destroy - Take down a command buffer manager. |
* |
* @man: Pointer to a command buffer manager. |
* |
* This function idles and then destroys a command buffer manager. |
*/ |
void vmw_cmdbuf_man_destroy(struct vmw_cmdbuf_man *man) |
{ |
WARN_ON_ONCE(man->has_pool); |
(void) vmw_cmdbuf_idle(man, false, 10*HZ); |
if (vmw_cmdbuf_startstop(man, false)) |
DRM_ERROR("Failed stopping command buffer context 0.\n"); |
|
vmw_generic_waiter_remove(man->dev_priv, SVGA_IRQFLAG_ERROR, |
&man->dev_priv->error_waiters); |
// tasklet_kill(&man->tasklet); |
// (void) cancel_work_sync(&man->work); |
dma_pool_destroy(man->dheaders); |
dma_pool_destroy(man->headers); |
mutex_destroy(&man->cur_mutex); |
mutex_destroy(&man->space_mutex); |
kfree(man); |
} |