drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c - kernel/msm-4.9 - Gitiles

 /**************************************************************************
  *
  * Copyright © 2009-2011 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 <drm/drmP.h>
 #include <drm/ttm/ttm_bo_driver.h>

 #define VMW_PPN_SIZE (sizeof(unsigned long))
 /* A future safe maximum remap size. */
 #define VMW_PPN_PER_REMAP ((31 * 1024) / VMW_PPN_SIZE)
 #define DMA_ADDR_INVALID ((dma_addr_t) 0)
 #define DMA_PAGE_INVALID 0UL

 static int vmw_gmr2_bind(struct vmw_private *dev_priv,
 			 struct vmw_piter *iter,
 			 unsigned long num_pages,
 			 int gmr_id)
 {
 	SVGAFifoCmdDefineGMR2 define_cmd;
 	SVGAFifoCmdRemapGMR2 remap_cmd;
 	uint32_t *cmd;
 	uint32_t *cmd_orig;
 	uint32_t define_size = sizeof(define_cmd) + sizeof(*cmd);
 	uint32_t remap_num = num_pages / VMW_PPN_PER_REMAP + ((num_pages % VMW_PPN_PER_REMAP) > 0);
 	uint32_t remap_size = VMW_PPN_SIZE * num_pages + (sizeof(remap_cmd) + sizeof(*cmd)) * remap_num;
 	uint32_t remap_pos = 0;
 	uint32_t cmd_size = define_size + remap_size;
 	uint32_t i;

 	cmd_orig = cmd = vmw_fifo_reserve(dev_priv, cmd_size);
 	if (unlikely(cmd == NULL))
 		return -ENOMEM;

 	define_cmd.gmrId = gmr_id;
 	define_cmd.numPages = num_pages;

 	*cmd++ = SVGA_CMD_DEFINE_GMR2;
 	memcpy(cmd, &define_cmd, sizeof(define_cmd));
 	cmd += sizeof(define_cmd) / sizeof(*cmd);

 	/*
 	 * Need to split the command if there are too many
 	 * pages that goes into the gmr.
 	 */

 	remap_cmd.gmrId = gmr_id;
 	remap_cmd.flags = (VMW_PPN_SIZE > sizeof(*cmd)) ?
 		SVGA_REMAP_GMR2_PPN64 : SVGA_REMAP_GMR2_PPN32;

 	while (num_pages > 0) {
 		unsigned long nr = min(num_pages, (unsigned long)VMW_PPN_PER_REMAP);

 		remap_cmd.offsetPages = remap_pos;
 		remap_cmd.numPages = nr;

 		*cmd++ = SVGA_CMD_REMAP_GMR2;
 		memcpy(cmd, &remap_cmd, sizeof(remap_cmd));
 		cmd += sizeof(remap_cmd) / sizeof(*cmd);

 		for (i = 0; i < nr; ++i) {
 			if (VMW_PPN_SIZE <= 4)
 				*cmd = vmw_piter_dma_addr(iter) >> PAGE_SHIFT;
 			else
 				*((uint64_t *)cmd) = vmw_piter_dma_addr(iter) >>
 					PAGE_SHIFT;

 			cmd += VMW_PPN_SIZE / sizeof(*cmd);
 			vmw_piter_next(iter);
 		}

 		num_pages -= nr;
 		remap_pos += nr;
 	}

 	BUG_ON(cmd != cmd_orig + cmd_size / sizeof(*cmd));

 	vmw_fifo_commit(dev_priv, cmd_size);

 	return 0;
 }

 static void vmw_gmr2_unbind(struct vmw_private *dev_priv,
 			    int gmr_id)
 {
 	SVGAFifoCmdDefineGMR2 define_cmd;
 	uint32_t define_size = sizeof(define_cmd) + 4;
 	uint32_t *cmd;

 	cmd = vmw_fifo_reserve(dev_priv, define_size);
 	if (unlikely(cmd == NULL)) {
 		DRM_ERROR("GMR2 unbind failed.\n");
 		return;
 	}
 	define_cmd.gmrId = gmr_id;
 	define_cmd.numPages = 0;

 	*cmd++ = SVGA_CMD_DEFINE_GMR2;
 	memcpy(cmd, &define_cmd, sizeof(define_cmd));

 	vmw_fifo_commit(dev_priv, define_size);
 }


 static void vmw_gmr_free_descriptors(struct device *dev, dma_addr_t desc_dma,
 				     struct list_head *desc_pages)
 {
 	struct page *page, *next;
 	struct svga_guest_mem_descriptor *page_virtual;
 	unsigned int desc_per_page = PAGE_SIZE /
 		sizeof(struct svga_guest_mem_descriptor) - 1;

 	if (list_empty(desc_pages))
 		return;

 	list_for_each_entry_safe(page, next, desc_pages, lru) {
 		list_del_init(&page->lru);

 		if (likely(desc_dma != DMA_ADDR_INVALID)) {
 			dma_unmap_page(dev, desc_dma, PAGE_SIZE,
 				       DMA_TO_DEVICE);
 		}

 		page_virtual = kmap_atomic(page);
 		desc_dma = (dma_addr_t)
 			le32_to_cpu(page_virtual[desc_per_page].ppn) <<
 			PAGE_SHIFT;
 		kunmap_atomic(page_virtual);

 		__free_page(page);
 	}
 }

 /**
  * FIXME: Adjust to the ttm lowmem / highmem storage to minimize
  * the number of used descriptors.
  *
  */

 static int vmw_gmr_build_descriptors(struct device *dev,
 				     struct list_head *desc_pages,
 				     struct vmw_piter *iter,
 				     unsigned long num_pages,
 				     dma_addr_t *first_dma)
 {
 	struct page *page;
 	struct svga_guest_mem_descriptor *page_virtual = NULL;
 	struct svga_guest_mem_descriptor *desc_virtual = NULL;
 	unsigned int desc_per_page;
 	unsigned long prev_pfn;
 	unsigned long pfn;
 	int ret;
 	dma_addr_t desc_dma;

 	desc_per_page = PAGE_SIZE /
 	    sizeof(struct svga_guest_mem_descriptor) - 1;

 	while (likely(num_pages != 0)) {
 		page = alloc_page(__GFP_HIGHMEM);
 		if (unlikely(page == NULL)) {
 			ret = -ENOMEM;
 			goto out_err;
 		}

 		list_add_tail(&page->lru, desc_pages);
 		page_virtual = kmap_atomic(page);
 		desc_virtual = page_virtual - 1;
 		prev_pfn = ~(0UL);

 		while (likely(num_pages != 0)) {
 			pfn = vmw_piter_dma_addr(iter) >> PAGE_SHIFT;

 			if (pfn != prev_pfn + 1) {

 				if (desc_virtual - page_virtual ==
 				    desc_per_page - 1)
 					break;

 				(++desc_virtual)->ppn = cpu_to_le32(pfn);
 				desc_virtual->num_pages = cpu_to_le32(1);
 			} else {
 				uint32_t tmp =
 				    le32_to_cpu(desc_virtual->num_pages);
 				desc_virtual->num_pages = cpu_to_le32(tmp + 1);
 			}
 			prev_pfn = pfn;
 			--num_pages;
 			vmw_piter_next(iter);
 		}

 		(++desc_virtual)->ppn = DMA_PAGE_INVALID;
 		desc_virtual->num_pages = cpu_to_le32(0);
 		kunmap_atomic(page_virtual);
 	}

 	desc_dma = 0;
 	list_for_each_entry_reverse(page, desc_pages, lru) {
 		page_virtual = kmap_atomic(page);
 		page_virtual[desc_per_page].ppn = cpu_to_le32
 			(desc_dma >> PAGE_SHIFT);
 		kunmap_atomic(page_virtual);
 		desc_dma = dma_map_page(dev, page, 0, PAGE_SIZE,
 					DMA_TO_DEVICE);

 		if (unlikely(dma_mapping_error(dev, desc_dma)))
 			goto out_err;
 	}
 	*first_dma = desc_dma;

 	return 0;
 out_err:
 	vmw_gmr_free_descriptors(dev, DMA_ADDR_INVALID, desc_pages);
 	return ret;
 }

 static void vmw_gmr_fire_descriptors(struct vmw_private *dev_priv,
 				     int gmr_id, dma_addr_t desc_dma)
 {
 	mutex_lock(&dev_priv->hw_mutex);

 	vmw_write(dev_priv, SVGA_REG_GMR_ID, gmr_id);
 	wmb();
 	vmw_write(dev_priv, SVGA_REG_GMR_DESCRIPTOR, desc_dma >> PAGE_SHIFT);
 	mb();

 	mutex_unlock(&dev_priv->hw_mutex);

 }

 int vmw_gmr_bind(struct vmw_private *dev_priv,
 		 const struct vmw_sg_table *vsgt,
 		 unsigned long num_pages,
 		 int gmr_id)
 {
 	struct list_head desc_pages;
 	dma_addr_t desc_dma = 0;
 	struct device *dev = dev_priv->dev->dev;
 	struct vmw_piter data_iter;
 	int ret;

 	vmw_piter_start(&data_iter, vsgt, 0);

 	if (unlikely(!vmw_piter_next(&data_iter)))
 		return 0;

 	if (likely(dev_priv->capabilities & SVGA_CAP_GMR2))
 		return vmw_gmr2_bind(dev_priv, &data_iter, num_pages, gmr_id);

 	if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR)))
 		return -EINVAL;

 	if (vsgt->num_regions > dev_priv->max_gmr_descriptors)
 		return -EINVAL;

 	INIT_LIST_HEAD(&desc_pages);

 	ret = vmw_gmr_build_descriptors(dev, &desc_pages, &data_iter,
 					num_pages, &desc_dma);
 	if (unlikely(ret != 0))
 		return ret;

 	vmw_gmr_fire_descriptors(dev_priv, gmr_id, desc_dma);
 	vmw_gmr_free_descriptors(dev, desc_dma, &desc_pages);

 	return 0;
 }


 void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id)
 {
 	if (likely(dev_priv->capabilities & SVGA_CAP_GMR2)) {
 		vmw_gmr2_unbind(dev_priv, gmr_id);
 		return;
 	}

 	mutex_lock(&dev_priv->hw_mutex);
 	vmw_write(dev_priv, SVGA_REG_GMR_ID, gmr_id);
 	wmb();
 	vmw_write(dev_priv, SVGA_REG_GMR_DESCRIPTOR, 0);
 	mb();
 	mutex_unlock(&dev_priv->hw_mutex);
 }
	/**************************************************************************
	*
	* Copyright © 2009-2011 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 <drm/drmP.h>
	#include <drm/ttm/ttm_bo_driver.h>

	#define VMW_PPN_SIZE (sizeof(unsigned long))
	/* A future safe maximum remap size. */
	#define VMW_PPN_PER_REMAP ((31 * 1024) / VMW_PPN_SIZE)
	#define DMA_ADDR_INVALID ((dma_addr_t) 0)
	#define DMA_PAGE_INVALID 0UL

	static int vmw_gmr2_bind(struct vmw_private *dev_priv,
	struct vmw_piter *iter,
	unsigned long num_pages,
	int gmr_id)
	{
	SVGAFifoCmdDefineGMR2 define_cmd;
	SVGAFifoCmdRemapGMR2 remap_cmd;
	uint32_t *cmd;
	uint32_t *cmd_orig;
	uint32_t define_size = sizeof(define_cmd) + sizeof(*cmd);
	uint32_t remap_num = num_pages / VMW_PPN_PER_REMAP + ((num_pages % VMW_PPN_PER_REMAP) > 0);
	uint32_t remap_size = VMW_PPN_SIZE * num_pages + (sizeof(remap_cmd) + sizeof(cmd)) remap_num;
	uint32_t remap_pos = 0;
	uint32_t cmd_size = define_size + remap_size;
	uint32_t i;

	cmd_orig = cmd = vmw_fifo_reserve(dev_priv, cmd_size);
	if (unlikely(cmd == NULL))
	return -ENOMEM;

	define_cmd.gmrId = gmr_id;
	define_cmd.numPages = num_pages;

	*cmd++ = SVGA_CMD_DEFINE_GMR2;
	memcpy(cmd, &define_cmd, sizeof(define_cmd));
	cmd += sizeof(define_cmd) / sizeof(*cmd);

	/*
	* Need to split the command if there are too many
	* pages that goes into the gmr.
	*/

	remap_cmd.gmrId = gmr_id;
	remap_cmd.flags = (VMW_PPN_SIZE > sizeof(*cmd)) ?
	SVGA_REMAP_GMR2_PPN64 : SVGA_REMAP_GMR2_PPN32;

	while (num_pages > 0) {
	unsigned long nr = min(num_pages, (unsigned long)VMW_PPN_PER_REMAP);

	remap_cmd.offsetPages = remap_pos;
	remap_cmd.numPages = nr;

	*cmd++ = SVGA_CMD_REMAP_GMR2;
	memcpy(cmd, &remap_cmd, sizeof(remap_cmd));
	cmd += sizeof(remap_cmd) / sizeof(*cmd);

	for (i = 0; i < nr; ++i) {
	if (VMW_PPN_SIZE <= 4)
	*cmd = vmw_piter_dma_addr(iter) >> PAGE_SHIFT;
	else
	((uint64_t )cmd) = vmw_piter_dma_addr(iter) >>
	PAGE_SHIFT;

	cmd += VMW_PPN_SIZE / sizeof(*cmd);
	vmw_piter_next(iter);
	}

	num_pages -= nr;
	remap_pos += nr;
	}

	BUG_ON(cmd != cmd_orig + cmd_size / sizeof(*cmd));

	vmw_fifo_commit(dev_priv, cmd_size);

	return 0;
	}

	static void vmw_gmr2_unbind(struct vmw_private *dev_priv,
	int gmr_id)
	{
	SVGAFifoCmdDefineGMR2 define_cmd;
	uint32_t define_size = sizeof(define_cmd) + 4;
	uint32_t *cmd;

	cmd = vmw_fifo_reserve(dev_priv, define_size);
	if (unlikely(cmd == NULL)) {
	DRM_ERROR("GMR2 unbind failed.\n");
	return;
	}
	define_cmd.gmrId = gmr_id;
	define_cmd.numPages = 0;

	*cmd++ = SVGA_CMD_DEFINE_GMR2;
	memcpy(cmd, &define_cmd, sizeof(define_cmd));

	vmw_fifo_commit(dev_priv, define_size);
	}


	static void vmw_gmr_free_descriptors(struct device *dev, dma_addr_t desc_dma,
	struct list_head *desc_pages)
	{
	struct page page, next;
	struct svga_guest_mem_descriptor *page_virtual;
	unsigned int desc_per_page = PAGE_SIZE /
	sizeof(struct svga_guest_mem_descriptor) - 1;

	if (list_empty(desc_pages))
	return;

	list_for_each_entry_safe(page, next, desc_pages, lru) {
	list_del_init(&page->lru);

	if (likely(desc_dma != DMA_ADDR_INVALID)) {
	dma_unmap_page(dev, desc_dma, PAGE_SIZE,
	DMA_TO_DEVICE);
	}

	page_virtual = kmap_atomic(page);
	desc_dma = (dma_addr_t)
	le32_to_cpu(page_virtual[desc_per_page].ppn) <<
	PAGE_SHIFT;
	kunmap_atomic(page_virtual);

	__free_page(page);
	}
	}

	/**
	* FIXME: Adjust to the ttm lowmem / highmem storage to minimize
	* the number of used descriptors.
	*
	*/

	static int vmw_gmr_build_descriptors(struct device *dev,
	struct list_head *desc_pages,
	struct vmw_piter *iter,
	unsigned long num_pages,
	dma_addr_t *first_dma)
	{
	struct page *page;
	struct svga_guest_mem_descriptor *page_virtual = NULL;
	struct svga_guest_mem_descriptor *desc_virtual = NULL;
	unsigned int desc_per_page;
	unsigned long prev_pfn;
	unsigned long pfn;
	int ret;
	dma_addr_t desc_dma;

	desc_per_page = PAGE_SIZE /
	sizeof(struct svga_guest_mem_descriptor) - 1;

	while (likely(num_pages != 0)) {
	page = alloc_page(__GFP_HIGHMEM);
	if (unlikely(page == NULL)) {
	ret = -ENOMEM;
	goto out_err;
	}

	list_add_tail(&page->lru, desc_pages);
	page_virtual = kmap_atomic(page);
	desc_virtual = page_virtual - 1;
	prev_pfn = ~(0UL);

	while (likely(num_pages != 0)) {
	pfn = vmw_piter_dma_addr(iter) >> PAGE_SHIFT;

	if (pfn != prev_pfn + 1) {

	if (desc_virtual - page_virtual ==
	desc_per_page - 1)
	break;

	(++desc_virtual)->ppn = cpu_to_le32(pfn);
	desc_virtual->num_pages = cpu_to_le32(1);
	} else {
	uint32_t tmp =
	le32_to_cpu(desc_virtual->num_pages);
	desc_virtual->num_pages = cpu_to_le32(tmp + 1);
	}
	prev_pfn = pfn;
	--num_pages;
	vmw_piter_next(iter);
	}

	(++desc_virtual)->ppn = DMA_PAGE_INVALID;
	desc_virtual->num_pages = cpu_to_le32(0);
	kunmap_atomic(page_virtual);
	}

	desc_dma = 0;
	list_for_each_entry_reverse(page, desc_pages, lru) {
	page_virtual = kmap_atomic(page);
	page_virtual[desc_per_page].ppn = cpu_to_le32
	(desc_dma >> PAGE_SHIFT);
	kunmap_atomic(page_virtual);
	desc_dma = dma_map_page(dev, page, 0, PAGE_SIZE,
	DMA_TO_DEVICE);

	if (unlikely(dma_mapping_error(dev, desc_dma)))
	goto out_err;
	}
	*first_dma = desc_dma;

	return 0;
	out_err:
	vmw_gmr_free_descriptors(dev, DMA_ADDR_INVALID, desc_pages);
	return ret;
	}

	static void vmw_gmr_fire_descriptors(struct vmw_private *dev_priv,
	int gmr_id, dma_addr_t desc_dma)
	{
	mutex_lock(&dev_priv->hw_mutex);

	vmw_write(dev_priv, SVGA_REG_GMR_ID, gmr_id);
	wmb();
	vmw_write(dev_priv, SVGA_REG_GMR_DESCRIPTOR, desc_dma >> PAGE_SHIFT);
	mb();

	mutex_unlock(&dev_priv->hw_mutex);

	}

	int vmw_gmr_bind(struct vmw_private *dev_priv,
	const struct vmw_sg_table *vsgt,
	unsigned long num_pages,
	int gmr_id)
	{
	struct list_head desc_pages;
	dma_addr_t desc_dma = 0;
	struct device *dev = dev_priv->dev->dev;
	struct vmw_piter data_iter;
	int ret;

	vmw_piter_start(&data_iter, vsgt, 0);

	if (unlikely(!vmw_piter_next(&data_iter)))
	return 0;

	if (likely(dev_priv->capabilities & SVGA_CAP_GMR2))
	return vmw_gmr2_bind(dev_priv, &data_iter, num_pages, gmr_id);

	if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR)))
	return -EINVAL;

	if (vsgt->num_regions > dev_priv->max_gmr_descriptors)
	return -EINVAL;

	INIT_LIST_HEAD(&desc_pages);

	ret = vmw_gmr_build_descriptors(dev, &desc_pages, &data_iter,
	num_pages, &desc_dma);
	if (unlikely(ret != 0))
	return ret;

	vmw_gmr_fire_descriptors(dev_priv, gmr_id, desc_dma);
	vmw_gmr_free_descriptors(dev, desc_dma, &desc_pages);

	return 0;
	}


	void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id)
	{
	if (likely(dev_priv->capabilities & SVGA_CAP_GMR2)) {
	vmw_gmr2_unbind(dev_priv, gmr_id);
	return;
	}

	mutex_lock(&dev_priv->hw_mutex);
	vmw_write(dev_priv, SVGA_REG_GMR_ID, gmr_id);
	wmb();
	vmw_write(dev_priv, SVGA_REG_GMR_DESCRIPTOR, 0);
	mb();
	mutex_unlock(&dev_priv->hw_mutex);
	}