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staging: sep: Basic infrastructure for SEP DMA access to non CPU regions
[This is picked out of the differences between the upstream driver and the staging driver. I'm resolving the differences as a series of updates -AC] Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mark A. Allyn
Greg Kroah-Hartman
parent
ffcf12810c
commit
aca58ec828
@ -61,7 +61,9 @@ enum hash_stage {
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HASH_INIT,
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HASH_UPDATE,
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HASH_FINISH,
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HASH_DIGEST
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HASH_DIGEST,
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HASH_FINUP_DATA,
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HASH_FINUP_FINISH
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};
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/*
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@ -205,6 +207,7 @@ struct sep_lli_entry {
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*/
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struct sep_fastcall_hdr {
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u32 magic;
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u32 secure_dma;
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u32 msg_len;
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u32 num_dcbs;
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};
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@ -231,6 +234,8 @@ struct sep_dma_context {
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u32 dmatables_len;
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/* size of input data */
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u32 input_data_len;
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/* secure dma use (for imr memory restriced area in output */
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bool secure_dma;
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struct sep_dma_resource dma_res_arr[SEP_MAX_NUM_SYNC_DMA_OPS];
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/* Scatter gather for kernel crypto */
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struct scatterlist *src_sg;
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@ -317,6 +322,7 @@ ssize_t sep_activate_dcb_dmatables_context(struct sep_device *sep,
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* @tail_block_size: u32; for size of tail block
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* @isapplet: bool; to indicate external app
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* @is_kva: bool; kernel buffer; only used for kernel crypto module
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* @secure_dma; indicates whether this is secure_dma using IMR
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*
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* This function prepares the linked DMA tables and puts the
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* address for the linked list of tables inta a DCB (data control
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@ -332,6 +338,7 @@ int sep_prepare_input_output_dma_table_in_dcb(struct sep_device *sep,
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u32 tail_block_size,
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bool isapplet,
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bool is_kva,
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bool secure_dma,
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struct sep_dcblock *dcb_region,
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void **dmatables_region,
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struct sep_dma_context **dma_ctx,
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@ -386,4 +393,10 @@ int sep_wait_transaction(struct sep_device *sep);
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struct sep_device;
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#define SEP_IOCPREPAREDCB_SECURE_DMA \
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_IOW(SEP_IOC_MAGIC_NUMBER, 38, struct build_dcb_struct)
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#define SEP_IOCFREEDCB_SECURE_DMA \
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_IO(SEP_IOC_MAGIC_NUMBER, 39)
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#endif
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@ -485,8 +485,15 @@ int sep_free_dma_table_data_handler(struct sep_device *sep,
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kfree(dma->in_map_array);
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}
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/* Unmap output map array, DON'T free it yet */
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if (dma->out_map_array) {
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/**
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* Output is handled different. If
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* this was a secure dma into restricted memory,
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* then we skip this step altogether as restricted
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* memory is not available to the o/s at all.
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*/
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if (((*dma_ctx)->secure_dma == false) &&
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(dma->out_map_array)) {
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for (count = 0; count < dma->out_num_pages; count++) {
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dma_unmap_page(&sep->pdev->dev,
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dma->out_map_array[count].dma_addr,
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@ -505,7 +512,10 @@ int sep_free_dma_table_data_handler(struct sep_device *sep,
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kfree(dma->in_page_array);
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}
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if (dma->out_page_array) {
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/* Again, we do this only for non secure dma */
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if (((*dma_ctx)->secure_dma == false) &&
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(dma->out_page_array)) {
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for (count = 0; count < dma->out_num_pages; count++) {
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if (!PageReserved(dma->out_page_array[count]))
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@ -1382,6 +1392,128 @@ end_function:
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return error;
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}
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/**
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* sep_lli_table_secure_dma - get lli array for IMR addresses
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* @sep: pointer to struct sep_device
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* @app_virt_addr: user memory data buffer
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* @data_size: size of data buffer
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* @lli_array_ptr: lli array
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* @in_out_flag: not used
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* @dma_ctx: pointer to struct sep_dma_context
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*
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* This function creates lli tables for outputting data to
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* IMR memory, which is memory that cannot be accessed by the
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* the x86 processor.
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*/
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static int sep_lli_table_secure_dma(struct sep_device *sep,
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u32 app_virt_addr,
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u32 data_size,
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struct sep_lli_entry **lli_array_ptr,
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int in_out_flag,
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struct sep_dma_context *dma_ctx)
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{
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int error = 0;
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u32 count;
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/* The the page of the end address of the user space buffer */
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u32 end_page;
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/* The page of the start address of the user space buffer */
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u32 start_page;
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/* The range in pages */
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u32 num_pages;
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/* Array of lli */
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struct sep_lli_entry *lli_array;
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/* Set start and end pages and num pages */
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end_page = (app_virt_addr + data_size - 1) >> PAGE_SHIFT;
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start_page = app_virt_addr >> PAGE_SHIFT;
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num_pages = end_page - start_page + 1;
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dev_dbg(&sep->pdev->dev, "[PID%d] lock user pages"
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" app_virt_addr is %x\n", current->pid, app_virt_addr);
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dev_dbg(&sep->pdev->dev, "[PID%d] data_size is (hex) %x\n",
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current->pid, data_size);
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dev_dbg(&sep->pdev->dev, "[PID%d] start_page is (hex) %x\n",
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current->pid, start_page);
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dev_dbg(&sep->pdev->dev, "[PID%d] end_page is (hex) %x\n",
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current->pid, end_page);
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dev_dbg(&sep->pdev->dev, "[PID%d] num_pages is (hex) %x\n",
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current->pid, num_pages);
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lli_array = kmalloc(sizeof(struct sep_lli_entry) * num_pages,
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GFP_ATOMIC);
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if (!lli_array) {
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dev_warn(&sep->pdev->dev,
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"[PID%d] kmalloc for lli_array failed\n",
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current->pid);
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return -ENOMEM;
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}
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/*
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* Fill the lli_array
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*/
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start_page = start_page << PAGE_SHIFT;
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for (count = 0; count < num_pages; count++) {
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/* Fill the lli array entry */
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lli_array[count].bus_address = start_page;
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lli_array[count].block_size = PAGE_SIZE;
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start_page += PAGE_SIZE;
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dev_dbg(&sep->pdev->dev,
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"[PID%d] lli_array[%x].bus_address is %08lx, "
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"lli_array[%x].block_size is (hex) %x\n",
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current->pid,
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count, (unsigned long)lli_array[count].bus_address,
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count, lli_array[count].block_size);
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}
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/* Check the offset for the first page */
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lli_array[0].bus_address =
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lli_array[0].bus_address + (app_virt_addr & (~PAGE_MASK));
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/* Check that not all the data is in the first page only */
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if ((PAGE_SIZE - (app_virt_addr & (~PAGE_MASK))) >= data_size)
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lli_array[0].block_size = data_size;
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else
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lli_array[0].block_size =
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PAGE_SIZE - (app_virt_addr & (~PAGE_MASK));
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dev_dbg(&sep->pdev->dev,
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"[PID%d] After check if page 0 has all data\n"
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"lli_array[0].bus_address is (hex) %08lx, "
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"lli_array[0].block_size is (hex) %x\n",
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current->pid,
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(unsigned long)lli_array[0].bus_address,
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lli_array[0].block_size);
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/* Check the size of the last page */
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if (num_pages > 1) {
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lli_array[num_pages - 1].block_size =
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(app_virt_addr + data_size) & (~PAGE_MASK);
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if (lli_array[num_pages - 1].block_size == 0)
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lli_array[num_pages - 1].block_size = PAGE_SIZE;
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dev_dbg(&sep->pdev->dev,
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"[PID%d] After last page size adjustment\n"
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"lli_array[%x].bus_address is (hex) %08lx, "
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"lli_array[%x].block_size is (hex) %x\n",
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current->pid, num_pages - 1,
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(unsigned long)lli_array[num_pages - 1].bus_address,
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num_pages - 1,
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lli_array[num_pages - 1].block_size);
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}
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*lli_array_ptr = lli_array;
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dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_num_pages = num_pages;
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dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_page_array = NULL;
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dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_map_array = NULL;
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dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_map_num_entries = 0;
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return error;
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}
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/**
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* sep_calculate_lli_table_max_size - size the LLI table
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* @sep: pointer to struct sep_device
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@ -1613,6 +1745,7 @@ static void sep_debug_print_lli_tables(struct sep_device *sep,
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unsigned long num_table_entries,
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unsigned long table_data_size)
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{
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#ifdef DEBUG
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unsigned long table_count = 1;
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unsigned long entries_count = 0;
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@ -1686,6 +1819,7 @@ static void sep_debug_print_lli_tables(struct sep_device *sep,
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}
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dev_dbg(&sep->pdev->dev, "[PID%d] sep_debug_print_lli_tables end\n",
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current->pid);
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#endif
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}
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@ -1956,8 +2090,10 @@ update_dcb_counter:
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end_function_error:
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/* Free all the allocated resources */
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kfree(dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_map_array);
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dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_map_array = NULL;
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kfree(lli_array_ptr);
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kfree(dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_page_array);
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dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_page_array = NULL;
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end_function:
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return error;
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@ -2360,20 +2496,42 @@ static int sep_prepare_input_output_dma_table(struct sep_device *sep,
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goto end_function;
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}
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dev_dbg(&sep->pdev->dev, "[PID%d] Locking user output pages\n",
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if (dma_ctx->secure_dma == true) {
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/* secure_dma requires use of non accessible memory */
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dev_dbg(&sep->pdev->dev, "[PID%d] in secure_dma\n",
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current->pid);
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error = sep_lli_table_secure_dma(sep,
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app_virt_out_addr, data_size, &lli_out_array,
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SEP_DRIVER_OUT_FLAG, dma_ctx);
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if (error) {
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dev_warn(&sep->pdev->dev,
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"[PID%d] secure dma table setup "
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" for output virtual buffer failed\n",
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current->pid);
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goto end_function_free_lli_in;
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}
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} else {
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/* For normal, non-secure dma */
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dev_dbg(&sep->pdev->dev, "[PID%d] not in secure_dma\n",
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current->pid);
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error = sep_lock_user_pages(sep, app_virt_out_addr,
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dev_dbg(&sep->pdev->dev,
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"[PID%d] Locking user output pages\n",
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current->pid);
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error = sep_lock_user_pages(sep, app_virt_out_addr,
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data_size, &lli_out_array, SEP_DRIVER_OUT_FLAG,
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dma_ctx);
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if (error) {
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dev_warn(&sep->pdev->dev,
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if (error) {
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dev_warn(&sep->pdev->dev,
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"[PID%d] sep_lock_user_pages"
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" for output virtual buffer failed\n",
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current->pid);
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goto end_function_free_lli_in;
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goto end_function_free_lli_in;
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}
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}
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}
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@ -2421,13 +2579,17 @@ update_dcb_counter:
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end_function_with_error:
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kfree(dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_map_array);
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dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_map_array = NULL;
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kfree(dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_page_array);
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dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_page_array = NULL;
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kfree(lli_out_array);
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end_function_free_lli_in:
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kfree(dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_map_array);
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dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_map_array = NULL;
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kfree(dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_page_array);
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dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_page_array = NULL;
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kfree(lli_in_array);
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end_function:
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@ -2445,6 +2607,7 @@ end_function:
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* @tail_block_size: u32; for size of tail block
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* @isapplet: bool; to indicate external app
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* @is_kva: bool; kernel buffer; only used for kernel crypto module
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* @secure_dma; indicates whether this is secure_dma using IMR
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*
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* This function prepares the linked DMA tables and puts the
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* address for the linked list of tables inta a DCB (data control
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@ -2460,6 +2623,7 @@ int sep_prepare_input_output_dma_table_in_dcb(struct sep_device *sep,
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u32 tail_block_size,
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bool isapplet,
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bool is_kva,
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bool secure_dma,
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struct sep_dcblock *dcb_region,
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void **dmatables_region,
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struct sep_dma_context **dma_ctx,
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@ -2534,6 +2698,8 @@ int sep_prepare_input_output_dma_table_in_dcb(struct sep_device *sep,
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current->pid, *dma_ctx);
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}
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(*dma_ctx)->secure_dma = secure_dma;
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/* these are for kernel crypto only */
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(*dma_ctx)->src_sg = src_sg;
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(*dma_ctx)->dst_sg = dst_sg;
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@ -2690,6 +2856,7 @@ int sep_prepare_input_output_dma_table_in_dcb(struct sep_device *sep,
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end_function_error:
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kfree(*dma_ctx);
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*dma_ctx = NULL;
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end_function:
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return error;
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@ -2719,15 +2886,22 @@ static int sep_free_dma_tables_and_dcb(struct sep_device *sep, bool isapplet,
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dev_dbg(&sep->pdev->dev, "[PID%d] sep_free_dma_tables_and_dcb\n",
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current->pid);
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if (isapplet == true) {
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if (((*dma_ctx)->secure_dma == false) && (isapplet == true)) {
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dev_dbg(&sep->pdev->dev, "[PID%d] handling applet\n",
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current->pid);
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/* Tail stuff is only for non secure_dma */
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/* Set pointer to first DCB table */
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dcb_table_ptr = (struct sep_dcblock *)
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(sep->shared_addr +
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SEP_DRIVER_SYSTEM_DCB_MEMORY_OFFSET_IN_BYTES);
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/* Go over each DCB and see if tail pointer must be updated */
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for (i = 0;
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i < (*dma_ctx)->nr_dcb_creat; i++, dcb_table_ptr++) {
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/**
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* Go over each DCB and see if
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* tail pointer must be updated
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*/
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for (i = 0; dma_ctx && *dma_ctx &&
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i < (*dma_ctx)->nr_dcb_creat; i++, dcb_table_ptr++) {
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if (dcb_table_ptr->out_vr_tail_pt) {
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pt_hold = (unsigned long)dcb_table_ptr->
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out_vr_tail_pt;
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@ -2749,6 +2923,7 @@ static int sep_free_dma_tables_and_dcb(struct sep_device *sep, bool isapplet,
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}
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}
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}
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/* Free the output pages, if any */
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sep_free_dma_table_data_handler(sep, dma_ctx);
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@ -2762,11 +2937,13 @@ static int sep_free_dma_tables_and_dcb(struct sep_device *sep, bool isapplet,
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* sep_prepare_dcb_handler - prepare a control block
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* @sep: pointer to struct sep_device
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* @arg: pointer to user parameters
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* @secure_dma: indicate whether we are using secure_dma on IMR
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*
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* This function will retrieve the RAR buffer physical addresses, type
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* & size corresponding to the RAR handles provided in the buffers vector.
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*/
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static int sep_prepare_dcb_handler(struct sep_device *sep, unsigned long arg,
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bool secure_dma,
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struct sep_dma_context **dma_ctx)
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{
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int error;
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@ -2812,7 +2989,7 @@ static int sep_prepare_dcb_handler(struct sep_device *sep, unsigned long arg,
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command_args.data_in_size, command_args.block_size,
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command_args.tail_block_size,
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command_args.is_applet, false,
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NULL, NULL, dma_ctx, NULL, NULL);
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secure_dma, NULL, NULL, dma_ctx, NULL, NULL);
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end_function:
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return error;
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@ -2829,21 +3006,18 @@ end_function:
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static int sep_free_dcb_handler(struct sep_device *sep,
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struct sep_dma_context **dma_ctx)
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{
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int error = 0;
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if (!dma_ctx || !(*dma_ctx)) {
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dev_dbg(&sep->pdev->dev, "[PID%d] no dma context defined, nothing to free\n",
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dev_dbg(&sep->pdev->dev,
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"[PID%d] no dma context defined, nothing to free\n",
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current->pid);
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return error;
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return -EINVAL;
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}
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dev_dbg(&sep->pdev->dev, "[PID%d] free dcbs num of DCBs %x\n",
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||||
current->pid,
|
||||
(*dma_ctx)->nr_dcb_creat);
|
||||
|
||||
error = sep_free_dma_tables_and_dcb(sep, false, false, dma_ctx);
|
||||
|
||||
return error;
|
||||
return sep_free_dma_tables_and_dcb(sep, false, false, dma_ctx);
|
||||
}
|
||||
|
||||
/**
|
||||
@ -2931,7 +3105,7 @@ static long sep_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
||||
goto end_function;
|
||||
}
|
||||
|
||||
error = sep_prepare_dcb_handler(sep, arg, dma_ctx);
|
||||
error = sep_prepare_dcb_handler(sep, arg, false, dma_ctx);
|
||||
dev_dbg(&sep->pdev->dev, "[PID%d] SEP_IOCPREPAREDCB end\n",
|
||||
current->pid);
|
||||
break;
|
||||
@ -3170,13 +3344,14 @@ end_function:
|
||||
* @dma_ctx: DMA context buf to create for current transaction
|
||||
* @user_dcb_args: User arguments for DCB/MLLI creation
|
||||
* @num_dcbs: Number of DCBs to create
|
||||
* @secure_dma: Indicate use of IMR restricted memory secure dma
|
||||
*/
|
||||
static ssize_t sep_create_dcb_dmatables_context(struct sep_device *sep,
|
||||
struct sep_dcblock **dcb_region,
|
||||
void **dmatables_region,
|
||||
struct sep_dma_context **dma_ctx,
|
||||
const struct build_dcb_struct __user *user_dcb_args,
|
||||
const u32 num_dcbs)
|
||||
const u32 num_dcbs, bool secure_dma)
|
||||
{
|
||||
int error = 0;
|
||||
int i = 0;
|
||||
@ -3231,7 +3406,7 @@ static ssize_t sep_create_dcb_dmatables_context(struct sep_device *sep,
|
||||
dcb_args[i].block_size,
|
||||
dcb_args[i].tail_block_size,
|
||||
dcb_args[i].is_applet,
|
||||
false,
|
||||
false, secure_dma,
|
||||
*dcb_region, dmatables_region,
|
||||
dma_ctx,
|
||||
NULL,
|
||||
@ -3242,6 +3417,9 @@ static ssize_t sep_create_dcb_dmatables_context(struct sep_device *sep,
|
||||
current->pid);
|
||||
goto end_function;
|
||||
}
|
||||
|
||||
if (dcb_args[i].app_in_address != 0)
|
||||
(*dma_ctx)->input_data_len += dcb_args[i].data_in_size;
|
||||
}
|
||||
|
||||
end_function:
|
||||
@ -3311,6 +3489,7 @@ int sep_create_dcb_dmatables_context_kernel(struct sep_device *sep,
|
||||
dcb_data->tail_block_size,
|
||||
dcb_data->is_applet,
|
||||
true,
|
||||
false,
|
||||
*dcb_region, dmatables_region,
|
||||
dma_ctx,
|
||||
dcb_data->src_sg,
|
||||
@ -3597,6 +3776,7 @@ static ssize_t sep_write(struct file *filp,
|
||||
struct sep_dcblock *dcb_region = NULL;
|
||||
ssize_t error = 0;
|
||||
struct sep_queue_info *my_queue_elem = NULL;
|
||||
bool my_secure_dma; /* are we using secure_dma (IMR)? */
|
||||
|
||||
dev_dbg(&sep->pdev->dev, "[PID%d] sep dev is 0x%p\n",
|
||||
current->pid, sep);
|
||||
@ -3609,6 +3789,11 @@ static ssize_t sep_write(struct file *filp,
|
||||
|
||||
buf_user += sizeof(struct sep_fastcall_hdr);
|
||||
|
||||
if (call_hdr.secure_dma == 0)
|
||||
my_secure_dma = false;
|
||||
else
|
||||
my_secure_dma = true;
|
||||
|
||||
/*
|
||||
* Controlling driver memory usage by limiting amount of
|
||||
* buffers created. Only SEP_DOUBLEBUF_USERS_LIMIT number
|
||||
@ -3636,7 +3821,7 @@ static ssize_t sep_write(struct file *filp,
|
||||
&dma_ctx,
|
||||
(const struct build_dcb_struct __user *)
|
||||
buf_user,
|
||||
call_hdr.num_dcbs);
|
||||
call_hdr.num_dcbs, my_secure_dma);
|
||||
if (error)
|
||||
goto end_function_error_doublebuf;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user