msm: camera: mem_mgr: Cache invalidation optimization

During unmap these internal buffers will be freed immediately
afterwards, therefore there is no need to do cache operation.

CRs-Fixed: 2627074
Change-Id: Ica4ebb93eb212604268c3450a92d075197783537
Signed-off-by: Karthik Jayakumar <kjayakum@codeaurora.org>

drivers/cam_req_mgr/cam_mem_mgr.c

@@ -196,6 +196,7 @@ static void cam_mem_put_slot(int32_t idx)
 	mutex_lock(&tbl.m_lock);
 	mutex_lock(&tbl.bufq[idx].q_lock);
 	tbl.bufq[idx].active = false;
+	tbl.bufq[idx].is_internal = false;
 	mutex_unlock(&tbl.bufq[idx].q_lock);
 	mutex_destroy(&tbl.bufq[idx].q_lock);
 	clear_bit(idx, tbl.bitmap);
@@ -540,7 +541,8 @@ static int cam_mem_util_map_hw_va(uint32_t flags,
 	int fd,
 	dma_addr_t *hw_vaddr,
 	size_t *len,
-	enum cam_smmu_region_id region)
+	enum cam_smmu_region_id region,
+	bool is_internal)
 {
 	int i;
 	int rc = -1;
@@ -582,7 +584,8 @@ static int cam_mem_util_map_hw_va(uint32_t flags,
 				dir,
 				(dma_addr_t *)hw_vaddr,
 				len,
-				region);
+				region,
+				is_internal);
 
 			if (rc < 0) {
 				CAM_ERR(CAM_MEM,
@@ -675,7 +678,8 @@ int cam_mem_mgr_alloc_and_map(struct cam_mem_mgr_alloc_cmd *cmd)
 			fd,
 			&hw_vaddr,
 			&len,
-			region);
+			region,
+			true);
 
 		if (rc) {
 			CAM_ERR(CAM_MEM,
@@ -691,6 +695,7 @@ int cam_mem_mgr_alloc_and_map(struct cam_mem_mgr_alloc_cmd *cmd)
 	tbl.bufq[idx].dma_buf = NULL;
 	tbl.bufq[idx].flags = cmd->flags;
 	tbl.bufq[idx].buf_handle = GET_MEM_HANDLE(idx, fd);
+	tbl.bufq[idx].is_internal = true;
 	if (cmd->flags & CAM_MEM_FLAG_PROTECTED_MODE)
 		CAM_MEM_MGR_SET_SECURE_HDL(tbl.bufq[idx].buf_handle, true);
 
@@ -733,6 +738,23 @@ slot_fail:
 	return rc;
 }
 
+static bool cam_mem_util_is_map_internal(int32_t fd)
+{
+	uint32_t i;
+	bool is_internal = false;
+
+	mutex_lock(&tbl.m_lock);
+	for_each_set_bit(i, tbl.bitmap, tbl.bits) {
+		if (tbl.bufq[i].fd == fd) {
+			is_internal = tbl.bufq[i].is_internal;
+			break;
+		}
+	}
+	mutex_unlock(&tbl.m_lock);
+
+	return is_internal;
+}
+
 int cam_mem_mgr_map(struct cam_mem_mgr_map_cmd *cmd)
 {
 	int32_t idx;
@@ -740,6 +762,7 @@ int cam_mem_mgr_map(struct cam_mem_mgr_map_cmd *cmd)
 	struct dma_buf *dmabuf;
 	dma_addr_t hw_vaddr = 0;
 	size_t len = 0;
+	bool is_internal = false;
 
 	if (!atomic_read(&cam_mem_mgr_state)) {
 		CAM_ERR(CAM_MEM, "failed. mem_mgr not initialized");
@@ -769,6 +792,8 @@ int cam_mem_mgr_map(struct cam_mem_mgr_map_cmd *cmd)
 		return -EINVAL;
 	}
 
+	is_internal = cam_mem_util_is_map_internal(cmd->fd);
+
 	if ((cmd->flags & CAM_MEM_FLAG_HW_READ_WRITE) ||
 		(cmd->flags & CAM_MEM_FLAG_PROTECTED_MODE)) {
 		rc = cam_mem_util_map_hw_va(cmd->flags,
@@ -777,7 +802,8 @@ int cam_mem_mgr_map(struct cam_mem_mgr_map_cmd *cmd)
 			cmd->fd,
 			&hw_vaddr,
 			&len,
-			CAM_SMMU_REGION_IO);
+			CAM_SMMU_REGION_IO,
+			is_internal);
 		if (rc) {
 			CAM_ERR(CAM_MEM,
 				"Failed in map_hw_va, flags=0x%x, fd=%d, region=%d, num_hdl=%d, rc=%d",
@@ -813,6 +839,7 @@ int cam_mem_mgr_map(struct cam_mem_mgr_map_cmd *cmd)
 	memcpy(tbl.bufq[idx].hdls, cmd->mmu_hdls,
 		sizeof(int32_t) * cmd->num_hdl);
 	tbl.bufq[idx].is_imported = true;
+	tbl.bufq[idx].is_internal = is_internal;
 	mutex_unlock(&tbl.bufq[idx].q_lock);
 
 	cmd->out.buf_handle = tbl.bufq[idx].buf_handle;
@@ -939,6 +966,7 @@ static int cam_mem_mgr_cleanup_table(void)
 		tbl.bufq[i].num_hdl = 0;
 		tbl.bufq[i].dma_buf = NULL;
 		tbl.bufq[i].active = false;
+		tbl.bufq[i].is_internal = false;
 		mutex_unlock(&tbl.bufq[i].q_lock);
 		mutex_destroy(&tbl.bufq[i].q_lock);
 	}
@@ -1034,6 +1062,7 @@ static int cam_mem_util_unmap(int32_t idx,
 	tbl.bufq[idx].fd = -1;
 	tbl.bufq[idx].dma_buf = NULL;
 	tbl.bufq[idx].is_imported = false;
+	tbl.bufq[idx].is_internal = false;
 	tbl.bufq[idx].len = 0;
 	tbl.bufq[idx].num_hdl = 0;
 	tbl.bufq[idx].active = false;

drivers/cam_req_mgr/cam_mem_mgr.h

@@ -41,6 +41,7 @@ enum cam_smmu_mapping_client {
  * @kmdvaddr:    Kernel virtual address
  * @active:      state of the buffer
  * @is_imported: Flag indicating if buffer is imported from an FD in user space
+ * @is_internal: Flag indicating kernel allocated buffer
  */
 struct cam_mem_buf_queue {
 	struct dma_buf *dma_buf;
@@ -56,6 +57,7 @@ struct cam_mem_buf_queue {
 	uintptr_t kmdvaddr;
 	bool active;
 	bool is_imported;
+	bool is_internal;
 };
 
 /**

drivers/cam_req_mgr/cam_req_mgr_dev.c

@@ -7,6 +7,7 @@
 #include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/highmem.h>
+#include <linux/types.h>
 
 #include <mm/slab.h>
 

drivers/cam_smmu/cam_smmu_api.c

@@ -197,6 +197,7 @@ struct cam_dma_buff_info {
 	int ion_fd;
 	size_t len;
 	size_t phys_len;
+	bool is_internal;
 };
 
 struct cam_sec_buff_info {
@@ -249,7 +250,7 @@ static struct cam_dma_buff_info *cam_smmu_find_mapping_by_virt_address(int idx,
 static int cam_smmu_map_buffer_and_add_to_list(int idx, int ion_fd,
 	bool dis_delayed_unmap, enum dma_data_direction dma_dir,
 	dma_addr_t *paddr_ptr, size_t *len_ptr,
-	enum cam_smmu_region_id region_id);
+	enum cam_smmu_region_id region_id, bool is_internal);
 
 static int cam_smmu_map_kernel_buffer_and_add_to_list(int idx,
 	struct dma_buf *buf, enum dma_data_direction dma_dir,
@@ -1997,7 +1998,7 @@ err_out:
 static int cam_smmu_map_buffer_and_add_to_list(int idx, int ion_fd,
 	bool dis_delayed_unmap, enum dma_data_direction dma_dir,
 	dma_addr_t *paddr_ptr, size_t *len_ptr,
-	enum cam_smmu_region_id region_id)
+	enum cam_smmu_region_id region_id, bool is_internal)
 {
 	int rc = -1;
 	struct cam_dma_buff_info *mapping_info = NULL;
@@ -2015,6 +2016,7 @@ static int cam_smmu_map_buffer_and_add_to_list(int idx, int ion_fd,
 	}
 
 	mapping_info->ion_fd = ion_fd;
+	mapping_info->is_internal = is_internal;
 	/* add to the list */
 	list_add(&mapping_info->list,
 		&iommu_cb_set.cb_info[idx].smmu_buf_list);
@@ -2118,6 +2120,9 @@ static int cam_smmu_unmap_buf_and_remove_from_list(
 		iommu_cb_set.cb_info[idx].io_mapping_size -= mapping_info->len;
 	}
 
+	if (mapping_info->is_internal)
+		mapping_info->attach->dma_map_attrs |= DMA_ATTR_SKIP_CPU_SYNC;
+
 	dma_buf_unmap_attachment(mapping_info->attach,
 		mapping_info->table, mapping_info->dir);
 	dma_buf_detach(mapping_info->buf, mapping_info->attach);
@@ -2877,7 +2882,8 @@ static int cam_smmu_map_iova_validate_params(int handle,
 
 int cam_smmu_map_user_iova(int handle, int ion_fd, bool dis_delayed_unmap,
 	enum cam_smmu_map_dir dir, dma_addr_t *paddr_ptr,
-	size_t *len_ptr, enum cam_smmu_region_id region_id)
+	size_t *len_ptr, enum cam_smmu_region_id region_id,
+	bool is_internal)
 {
 	int idx, rc = 0;
 	enum cam_smmu_buf_state buf_state;
@@ -2927,7 +2933,8 @@ int cam_smmu_map_user_iova(int handle, int ion_fd, bool dis_delayed_unmap,
 	}
 
 	rc = cam_smmu_map_buffer_and_add_to_list(idx, ion_fd,
-		dis_delayed_unmap, dma_dir, paddr_ptr, len_ptr, region_id);
+		dis_delayed_unmap, dma_dir, paddr_ptr, len_ptr,
+		region_id, is_internal);
 	if (rc < 0) {
 		CAM_ERR(CAM_SMMU,
 			"mapping or add list fail, idx=%d, fd=%d, region=%d, rc=%d",

drivers/cam_smmu/cam_smmu_api.h

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Copyright (c) 2014-2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2014-2020, The Linux Foundation. All rights reserved.
  */
 
 #ifndef _CAM_SMMU_API_H_
@@ -111,11 +111,13 @@ int cam_smmu_ops(int handle, enum cam_smmu_ops_param op);
  *                CAM_SMMU_REGION_SHARED, dma_addr is used as an input parameter
  *                which specifies the cpu virtual address to map.
  * @len_ptr     : Length of buffer mapped returned by CAM SMMU driver.
+ * @region_id   : Memory region identifier
+ * @is_internal: Specifies if this buffer is kernel allocated.
  * @return Status of operation. Negative in case of error. Zero otherwise.
  */
 int cam_smmu_map_user_iova(int handle, int ion_fd, bool dis_delayed_unmap,
 	enum cam_smmu_map_dir dir, dma_addr_t *dma_addr, size_t *len_ptr,
-	enum cam_smmu_region_id region_id);
+	enum cam_smmu_region_id region_id, bool is_internal);
 
 /**
  * @brief        : Maps kernel space IOVA for calling driver
@@ -129,6 +131,7 @@ int cam_smmu_map_user_iova(int handle, int ion_fd, bool dis_delayed_unmap,
  *                 CAM_SMMU_REGION_SHARED, dma_addr is used as an input
  *                 parameter which specifies the cpu virtual address to map.
  * @len_ptr      : Length of buffer mapped returned by CAM SMMU driver.
+ * @region_id    : Memory region identifier
  * @return Status of operation. Negative in case of error. Zero otherwise.
  */
 int cam_smmu_map_kernel_iova(int handle,