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1763 lines
48 KiB
1763 lines
48 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright(C) 2016 Linaro Limited. All rights reserved. |
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* Author: Mathieu Poirier <[email protected]> |
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*/ |
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|
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#include <linux/atomic.h> |
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#include <linux/coresight.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/iommu.h> |
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#include <linux/idr.h> |
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#include <linux/mutex.h> |
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#include <linux/refcount.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#include <linux/vmalloc.h> |
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#include "coresight-catu.h" |
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#include "coresight-etm-perf.h" |
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#include "coresight-priv.h" |
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#include "coresight-tmc.h" |
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|
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struct etr_flat_buf { |
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struct device *dev; |
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dma_addr_t daddr; |
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void *vaddr; |
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size_t size; |
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}; |
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|
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/* |
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* etr_perf_buffer - Perf buffer used for ETR |
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* @drvdata - The ETR drvdaga this buffer has been allocated for. |
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* @etr_buf - Actual buffer used by the ETR |
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* @pid - The PID this etr_perf_buffer belongs to. |
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* @snaphost - Perf session mode |
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* @head - handle->head at the beginning of the session. |
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* @nr_pages - Number of pages in the ring buffer. |
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* @pages - Array of Pages in the ring buffer. |
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*/ |
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struct etr_perf_buffer { |
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struct tmc_drvdata *drvdata; |
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struct etr_buf *etr_buf; |
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pid_t pid; |
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bool snapshot; |
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unsigned long head; |
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int nr_pages; |
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void **pages; |
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}; |
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|
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/* Convert the perf index to an offset within the ETR buffer */ |
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#define PERF_IDX2OFF(idx, buf) ((idx) % ((buf)->nr_pages << PAGE_SHIFT)) |
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|
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/* Lower limit for ETR hardware buffer */ |
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#define TMC_ETR_PERF_MIN_BUF_SIZE SZ_1M |
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|
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/* |
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* The TMC ETR SG has a page size of 4K. The SG table contains pointers |
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* to 4KB buffers. However, the OS may use a PAGE_SIZE different from |
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* 4K (i.e, 16KB or 64KB). This implies that a single OS page could |
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* contain more than one SG buffer and tables. |
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* |
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* A table entry has the following format: |
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* |
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* ---Bit31------------Bit4-------Bit1-----Bit0-- |
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* | Address[39:12] | SBZ | Entry Type | |
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* ---------------------------------------------- |
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* |
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* Address: Bits [39:12] of a physical page address. Bits [11:0] are |
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* always zero. |
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* |
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* Entry type: |
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* b00 - Reserved. |
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* b01 - Last entry in the tables, points to 4K page buffer. |
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* b10 - Normal entry, points to 4K page buffer. |
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* b11 - Link. The address points to the base of next table. |
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*/ |
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|
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typedef u32 sgte_t; |
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|
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#define ETR_SG_PAGE_SHIFT 12 |
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#define ETR_SG_PAGE_SIZE (1UL << ETR_SG_PAGE_SHIFT) |
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#define ETR_SG_PAGES_PER_SYSPAGE (PAGE_SIZE / ETR_SG_PAGE_SIZE) |
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#define ETR_SG_PTRS_PER_PAGE (ETR_SG_PAGE_SIZE / sizeof(sgte_t)) |
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#define ETR_SG_PTRS_PER_SYSPAGE (PAGE_SIZE / sizeof(sgte_t)) |
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|
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#define ETR_SG_ET_MASK 0x3 |
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#define ETR_SG_ET_LAST 0x1 |
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#define ETR_SG_ET_NORMAL 0x2 |
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#define ETR_SG_ET_LINK 0x3 |
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|
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#define ETR_SG_ADDR_SHIFT 4 |
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|
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#define ETR_SG_ENTRY(addr, type) \ |
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(sgte_t)((((addr) >> ETR_SG_PAGE_SHIFT) << ETR_SG_ADDR_SHIFT) | \ |
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(type & ETR_SG_ET_MASK)) |
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|
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#define ETR_SG_ADDR(entry) \ |
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(((dma_addr_t)(entry) >> ETR_SG_ADDR_SHIFT) << ETR_SG_PAGE_SHIFT) |
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#define ETR_SG_ET(entry) ((entry) & ETR_SG_ET_MASK) |
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|
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/* |
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* struct etr_sg_table : ETR SG Table |
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* @sg_table: Generic SG Table holding the data/table pages. |
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* @hwaddr: hwaddress used by the TMC, which is the base |
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* address of the table. |
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*/ |
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struct etr_sg_table { |
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struct tmc_sg_table *sg_table; |
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dma_addr_t hwaddr; |
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}; |
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|
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/* |
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* tmc_etr_sg_table_entries: Total number of table entries required to map |
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* @nr_pages system pages. |
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* |
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* We need to map @nr_pages * ETR_SG_PAGES_PER_SYSPAGE data pages. |
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* Each TMC page can map (ETR_SG_PTRS_PER_PAGE - 1) buffer pointers, |
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* with the last entry pointing to another page of table entries. |
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* If we spill over to a new page for mapping 1 entry, we could as |
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* well replace the link entry of the previous page with the last entry. |
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*/ |
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static inline unsigned long __attribute_const__ |
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tmc_etr_sg_table_entries(int nr_pages) |
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{ |
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unsigned long nr_sgpages = nr_pages * ETR_SG_PAGES_PER_SYSPAGE; |
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unsigned long nr_sglinks = nr_sgpages / (ETR_SG_PTRS_PER_PAGE - 1); |
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/* |
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* If we spill over to a new page for 1 entry, we could as well |
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* make it the LAST entry in the previous page, skipping the Link |
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* address. |
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*/ |
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if (nr_sglinks && (nr_sgpages % (ETR_SG_PTRS_PER_PAGE - 1) < 2)) |
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nr_sglinks--; |
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return nr_sgpages + nr_sglinks; |
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} |
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|
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/* |
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* tmc_pages_get_offset: Go through all the pages in the tmc_pages |
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* and map the device address @addr to an offset within the virtual |
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* contiguous buffer. |
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*/ |
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static long |
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tmc_pages_get_offset(struct tmc_pages *tmc_pages, dma_addr_t addr) |
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{ |
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int i; |
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dma_addr_t page_start; |
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|
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for (i = 0; i < tmc_pages->nr_pages; i++) { |
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page_start = tmc_pages->daddrs[i]; |
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if (addr >= page_start && addr < (page_start + PAGE_SIZE)) |
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return i * PAGE_SIZE + (addr - page_start); |
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} |
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|
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return -EINVAL; |
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} |
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|
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/* |
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* tmc_pages_free : Unmap and free the pages used by tmc_pages. |
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* If the pages were not allocated in tmc_pages_alloc(), we would |
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* simply drop the refcount. |
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*/ |
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static void tmc_pages_free(struct tmc_pages *tmc_pages, |
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struct device *dev, enum dma_data_direction dir) |
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{ |
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int i; |
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struct device *real_dev = dev->parent; |
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|
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for (i = 0; i < tmc_pages->nr_pages; i++) { |
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if (tmc_pages->daddrs && tmc_pages->daddrs[i]) |
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dma_unmap_page(real_dev, tmc_pages->daddrs[i], |
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PAGE_SIZE, dir); |
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if (tmc_pages->pages && tmc_pages->pages[i]) |
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__free_page(tmc_pages->pages[i]); |
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} |
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|
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kfree(tmc_pages->pages); |
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kfree(tmc_pages->daddrs); |
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tmc_pages->pages = NULL; |
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tmc_pages->daddrs = NULL; |
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tmc_pages->nr_pages = 0; |
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} |
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|
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/* |
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* tmc_pages_alloc : Allocate and map pages for a given @tmc_pages. |
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* If @pages is not NULL, the list of page virtual addresses are |
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* used as the data pages. The pages are then dma_map'ed for @dev |
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* with dma_direction @dir. |
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* |
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* Returns 0 upon success, else the error number. |
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*/ |
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static int tmc_pages_alloc(struct tmc_pages *tmc_pages, |
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struct device *dev, int node, |
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enum dma_data_direction dir, void **pages) |
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{ |
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int i, nr_pages; |
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dma_addr_t paddr; |
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struct page *page; |
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struct device *real_dev = dev->parent; |
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|
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nr_pages = tmc_pages->nr_pages; |
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tmc_pages->daddrs = kcalloc(nr_pages, sizeof(*tmc_pages->daddrs), |
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GFP_KERNEL); |
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if (!tmc_pages->daddrs) |
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return -ENOMEM; |
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tmc_pages->pages = kcalloc(nr_pages, sizeof(*tmc_pages->pages), |
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GFP_KERNEL); |
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if (!tmc_pages->pages) { |
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kfree(tmc_pages->daddrs); |
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tmc_pages->daddrs = NULL; |
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return -ENOMEM; |
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} |
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|
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for (i = 0; i < nr_pages; i++) { |
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if (pages && pages[i]) { |
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page = virt_to_page(pages[i]); |
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/* Hold a refcount on the page */ |
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get_page(page); |
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} else { |
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page = alloc_pages_node(node, |
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GFP_KERNEL | __GFP_ZERO, 0); |
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if (!page) |
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goto err; |
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} |
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paddr = dma_map_page(real_dev, page, 0, PAGE_SIZE, dir); |
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if (dma_mapping_error(real_dev, paddr)) |
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goto err; |
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tmc_pages->daddrs[i] = paddr; |
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tmc_pages->pages[i] = page; |
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} |
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return 0; |
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err: |
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tmc_pages_free(tmc_pages, dev, dir); |
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return -ENOMEM; |
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} |
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|
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static inline long |
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tmc_sg_get_data_page_offset(struct tmc_sg_table *sg_table, dma_addr_t addr) |
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{ |
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return tmc_pages_get_offset(&sg_table->data_pages, addr); |
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} |
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static inline void tmc_free_table_pages(struct tmc_sg_table *sg_table) |
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{ |
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if (sg_table->table_vaddr) |
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vunmap(sg_table->table_vaddr); |
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tmc_pages_free(&sg_table->table_pages, sg_table->dev, DMA_TO_DEVICE); |
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} |
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|
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static void tmc_free_data_pages(struct tmc_sg_table *sg_table) |
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{ |
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if (sg_table->data_vaddr) |
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vunmap(sg_table->data_vaddr); |
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tmc_pages_free(&sg_table->data_pages, sg_table->dev, DMA_FROM_DEVICE); |
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} |
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|
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void tmc_free_sg_table(struct tmc_sg_table *sg_table) |
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{ |
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tmc_free_table_pages(sg_table); |
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tmc_free_data_pages(sg_table); |
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} |
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EXPORT_SYMBOL_GPL(tmc_free_sg_table); |
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|
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/* |
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* Alloc pages for the table. Since this will be used by the device, |
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* allocate the pages closer to the device (i.e, dev_to_node(dev) |
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* rather than the CPU node). |
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*/ |
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static int tmc_alloc_table_pages(struct tmc_sg_table *sg_table) |
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{ |
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int rc; |
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struct tmc_pages *table_pages = &sg_table->table_pages; |
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rc = tmc_pages_alloc(table_pages, sg_table->dev, |
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dev_to_node(sg_table->dev), |
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DMA_TO_DEVICE, NULL); |
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if (rc) |
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return rc; |
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sg_table->table_vaddr = vmap(table_pages->pages, |
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table_pages->nr_pages, |
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VM_MAP, |
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PAGE_KERNEL); |
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if (!sg_table->table_vaddr) |
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rc = -ENOMEM; |
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else |
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sg_table->table_daddr = table_pages->daddrs[0]; |
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return rc; |
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} |
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static int tmc_alloc_data_pages(struct tmc_sg_table *sg_table, void **pages) |
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{ |
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int rc; |
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|
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/* Allocate data pages on the node requested by the caller */ |
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rc = tmc_pages_alloc(&sg_table->data_pages, |
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sg_table->dev, sg_table->node, |
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DMA_FROM_DEVICE, pages); |
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if (!rc) { |
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sg_table->data_vaddr = vmap(sg_table->data_pages.pages, |
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sg_table->data_pages.nr_pages, |
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VM_MAP, |
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PAGE_KERNEL); |
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if (!sg_table->data_vaddr) |
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rc = -ENOMEM; |
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} |
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return rc; |
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} |
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|
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/* |
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* tmc_alloc_sg_table: Allocate and setup dma pages for the TMC SG table |
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* and data buffers. TMC writes to the data buffers and reads from the SG |
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* Table pages. |
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* |
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* @dev - Coresight device to which page should be DMA mapped. |
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* @node - Numa node for mem allocations |
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* @nr_tpages - Number of pages for the table entries. |
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* @nr_dpages - Number of pages for Data buffer. |
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* @pages - Optional list of virtual address of pages. |
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*/ |
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struct tmc_sg_table *tmc_alloc_sg_table(struct device *dev, |
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int node, |
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int nr_tpages, |
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int nr_dpages, |
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void **pages) |
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{ |
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long rc; |
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struct tmc_sg_table *sg_table; |
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sg_table = kzalloc(sizeof(*sg_table), GFP_KERNEL); |
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if (!sg_table) |
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return ERR_PTR(-ENOMEM); |
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sg_table->data_pages.nr_pages = nr_dpages; |
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sg_table->table_pages.nr_pages = nr_tpages; |
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sg_table->node = node; |
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sg_table->dev = dev; |
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|
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rc = tmc_alloc_data_pages(sg_table, pages); |
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if (!rc) |
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rc = tmc_alloc_table_pages(sg_table); |
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if (rc) { |
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tmc_free_sg_table(sg_table); |
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kfree(sg_table); |
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return ERR_PTR(rc); |
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} |
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|
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return sg_table; |
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} |
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EXPORT_SYMBOL_GPL(tmc_alloc_sg_table); |
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|
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/* |
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* tmc_sg_table_sync_data_range: Sync the data buffer written |
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* by the device from @offset upto a @size bytes. |
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*/ |
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void tmc_sg_table_sync_data_range(struct tmc_sg_table *table, |
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u64 offset, u64 size) |
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{ |
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int i, index, start; |
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int npages = DIV_ROUND_UP(size, PAGE_SIZE); |
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struct device *real_dev = table->dev->parent; |
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struct tmc_pages *data = &table->data_pages; |
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|
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start = offset >> PAGE_SHIFT; |
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for (i = start; i < (start + npages); i++) { |
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index = i % data->nr_pages; |
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dma_sync_single_for_cpu(real_dev, data->daddrs[index], |
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PAGE_SIZE, DMA_FROM_DEVICE); |
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} |
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} |
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EXPORT_SYMBOL_GPL(tmc_sg_table_sync_data_range); |
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|
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/* tmc_sg_sync_table: Sync the page table */ |
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void tmc_sg_table_sync_table(struct tmc_sg_table *sg_table) |
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{ |
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int i; |
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struct device *real_dev = sg_table->dev->parent; |
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struct tmc_pages *table_pages = &sg_table->table_pages; |
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|
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for (i = 0; i < table_pages->nr_pages; i++) |
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dma_sync_single_for_device(real_dev, table_pages->daddrs[i], |
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PAGE_SIZE, DMA_TO_DEVICE); |
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} |
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EXPORT_SYMBOL_GPL(tmc_sg_table_sync_table); |
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|
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/* |
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* tmc_sg_table_get_data: Get the buffer pointer for data @offset |
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* in the SG buffer. The @bufpp is updated to point to the buffer. |
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* Returns : |
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* the length of linear data available at @offset. |
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* or |
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* <= 0 if no data is available. |
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*/ |
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ssize_t tmc_sg_table_get_data(struct tmc_sg_table *sg_table, |
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u64 offset, size_t len, char **bufpp) |
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{ |
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size_t size; |
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int pg_idx = offset >> PAGE_SHIFT; |
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int pg_offset = offset & (PAGE_SIZE - 1); |
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struct tmc_pages *data_pages = &sg_table->data_pages; |
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|
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size = tmc_sg_table_buf_size(sg_table); |
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if (offset >= size) |
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return -EINVAL; |
|
|
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/* Make sure we don't go beyond the end */ |
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len = (len < (size - offset)) ? len : size - offset; |
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/* Respect the page boundaries */ |
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len = (len < (PAGE_SIZE - pg_offset)) ? len : (PAGE_SIZE - pg_offset); |
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if (len > 0) |
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*bufpp = page_address(data_pages->pages[pg_idx]) + pg_offset; |
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return len; |
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} |
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EXPORT_SYMBOL_GPL(tmc_sg_table_get_data); |
|
|
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#ifdef ETR_SG_DEBUG |
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/* Map a dma address to virtual address */ |
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static unsigned long |
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tmc_sg_daddr_to_vaddr(struct tmc_sg_table *sg_table, |
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dma_addr_t addr, bool table) |
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{ |
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long offset; |
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unsigned long base; |
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struct tmc_pages *tmc_pages; |
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|
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if (table) { |
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tmc_pages = &sg_table->table_pages; |
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base = (unsigned long)sg_table->table_vaddr; |
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} else { |
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tmc_pages = &sg_table->data_pages; |
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base = (unsigned long)sg_table->data_vaddr; |
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} |
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|
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offset = tmc_pages_get_offset(tmc_pages, addr); |
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if (offset < 0) |
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return 0; |
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return base + offset; |
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} |
|
|
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/* Dump the given sg_table */ |
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static void tmc_etr_sg_table_dump(struct etr_sg_table *etr_table) |
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{ |
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sgte_t *ptr; |
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int i = 0; |
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dma_addr_t addr; |
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struct tmc_sg_table *sg_table = etr_table->sg_table; |
|
|
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ptr = (sgte_t *)tmc_sg_daddr_to_vaddr(sg_table, |
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etr_table->hwaddr, true); |
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while (ptr) { |
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addr = ETR_SG_ADDR(*ptr); |
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switch (ETR_SG_ET(*ptr)) { |
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case ETR_SG_ET_NORMAL: |
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dev_dbg(sg_table->dev, |
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"%05d: %p\t:[N] 0x%llx\n", i, ptr, addr); |
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ptr++; |
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break; |
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case ETR_SG_ET_LINK: |
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dev_dbg(sg_table->dev, |
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"%05d: *** %p\t:{L} 0x%llx ***\n", |
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i, ptr, addr); |
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ptr = (sgte_t *)tmc_sg_daddr_to_vaddr(sg_table, |
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addr, true); |
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break; |
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case ETR_SG_ET_LAST: |
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dev_dbg(sg_table->dev, |
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"%05d: ### %p\t:[L] 0x%llx ###\n", |
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i, ptr, addr); |
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return; |
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default: |
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dev_dbg(sg_table->dev, |
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"%05d: xxx %p\t:[INVALID] 0x%llx xxx\n", |
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i, ptr, addr); |
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return; |
|
} |
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i++; |
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} |
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dev_dbg(sg_table->dev, "******* End of Table *****\n"); |
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} |
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#else |
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static inline void tmc_etr_sg_table_dump(struct etr_sg_table *etr_table) {} |
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#endif |
|
|
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/* |
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* Populate the SG Table page table entries from table/data |
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* pages allocated. Each Data page has ETR_SG_PAGES_PER_SYSPAGE SG pages. |
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* So does a Table page. So we keep track of indices of the tables |
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* in each system page and move the pointers accordingly. |
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*/ |
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#define INC_IDX_ROUND(idx, size) ((idx) = ((idx) + 1) % (size)) |
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static void tmc_etr_sg_table_populate(struct etr_sg_table *etr_table) |
|
{ |
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dma_addr_t paddr; |
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int i, type, nr_entries; |
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int tpidx = 0; /* index to the current system table_page */ |
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int sgtidx = 0; /* index to the sg_table within the current syspage */ |
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int sgtentry = 0; /* the entry within the sg_table */ |
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int dpidx = 0; /* index to the current system data_page */ |
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int spidx = 0; /* index to the SG page within the current data page */ |
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sgte_t *ptr; /* pointer to the table entry to fill */ |
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struct tmc_sg_table *sg_table = etr_table->sg_table; |
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dma_addr_t *table_daddrs = sg_table->table_pages.daddrs; |
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dma_addr_t *data_daddrs = sg_table->data_pages.daddrs; |
|
|
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nr_entries = tmc_etr_sg_table_entries(sg_table->data_pages.nr_pages); |
|
/* |
|
* Use the contiguous virtual address of the table to update entries. |
|
*/ |
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ptr = sg_table->table_vaddr; |
|
/* |
|
* Fill all the entries, except the last entry to avoid special |
|
* checks within the loop. |
|
*/ |
|
for (i = 0; i < nr_entries - 1; i++) { |
|
if (sgtentry == ETR_SG_PTRS_PER_PAGE - 1) { |
|
/* |
|
* Last entry in a sg_table page is a link address to |
|
* the next table page. If this sg_table is the last |
|
* one in the system page, it links to the first |
|
* sg_table in the next system page. Otherwise, it |
|
* links to the next sg_table page within the system |
|
* page. |
|
*/ |
|
if (sgtidx == ETR_SG_PAGES_PER_SYSPAGE - 1) { |
|
paddr = table_daddrs[tpidx + 1]; |
|
} else { |
|
paddr = table_daddrs[tpidx] + |
|
(ETR_SG_PAGE_SIZE * (sgtidx + 1)); |
|
} |
|
type = ETR_SG_ET_LINK; |
|
} else { |
|
/* |
|
* Update the indices to the data_pages to point to the |
|
* next sg_page in the data buffer. |
|
*/ |
|
type = ETR_SG_ET_NORMAL; |
|
paddr = data_daddrs[dpidx] + spidx * ETR_SG_PAGE_SIZE; |
|
if (!INC_IDX_ROUND(spidx, ETR_SG_PAGES_PER_SYSPAGE)) |
|
dpidx++; |
|
} |
|
*ptr++ = ETR_SG_ENTRY(paddr, type); |
|
/* |
|
* Move to the next table pointer, moving the table page index |
|
* if necessary |
|
*/ |
|
if (!INC_IDX_ROUND(sgtentry, ETR_SG_PTRS_PER_PAGE)) { |
|
if (!INC_IDX_ROUND(sgtidx, ETR_SG_PAGES_PER_SYSPAGE)) |
|
tpidx++; |
|
} |
|
} |
|
|
|
/* Set up the last entry, which is always a data pointer */ |
|
paddr = data_daddrs[dpidx] + spidx * ETR_SG_PAGE_SIZE; |
|
*ptr++ = ETR_SG_ENTRY(paddr, ETR_SG_ET_LAST); |
|
} |
|
|
|
/* |
|
* tmc_init_etr_sg_table: Allocate a TMC ETR SG table, data buffer of @size and |
|
* populate the table. |
|
* |
|
* @dev - Device pointer for the TMC |
|
* @node - NUMA node where the memory should be allocated |
|
* @size - Total size of the data buffer |
|
* @pages - Optional list of page virtual address |
|
*/ |
|
static struct etr_sg_table * |
|
tmc_init_etr_sg_table(struct device *dev, int node, |
|
unsigned long size, void **pages) |
|
{ |
|
int nr_entries, nr_tpages; |
|
int nr_dpages = size >> PAGE_SHIFT; |
|
struct tmc_sg_table *sg_table; |
|
struct etr_sg_table *etr_table; |
|
|
|
etr_table = kzalloc(sizeof(*etr_table), GFP_KERNEL); |
|
if (!etr_table) |
|
return ERR_PTR(-ENOMEM); |
|
nr_entries = tmc_etr_sg_table_entries(nr_dpages); |
|
nr_tpages = DIV_ROUND_UP(nr_entries, ETR_SG_PTRS_PER_SYSPAGE); |
|
|
|
sg_table = tmc_alloc_sg_table(dev, node, nr_tpages, nr_dpages, pages); |
|
if (IS_ERR(sg_table)) { |
|
kfree(etr_table); |
|
return ERR_CAST(sg_table); |
|
} |
|
|
|
etr_table->sg_table = sg_table; |
|
/* TMC should use table base address for DBA */ |
|
etr_table->hwaddr = sg_table->table_daddr; |
|
tmc_etr_sg_table_populate(etr_table); |
|
/* Sync the table pages for the HW */ |
|
tmc_sg_table_sync_table(sg_table); |
|
tmc_etr_sg_table_dump(etr_table); |
|
|
|
return etr_table; |
|
} |
|
|
|
/* |
|
* tmc_etr_alloc_flat_buf: Allocate a contiguous DMA buffer. |
|
*/ |
|
static int tmc_etr_alloc_flat_buf(struct tmc_drvdata *drvdata, |
|
struct etr_buf *etr_buf, int node, |
|
void **pages) |
|
{ |
|
struct etr_flat_buf *flat_buf; |
|
struct device *real_dev = drvdata->csdev->dev.parent; |
|
|
|
/* We cannot reuse existing pages for flat buf */ |
|
if (pages) |
|
return -EINVAL; |
|
|
|
flat_buf = kzalloc(sizeof(*flat_buf), GFP_KERNEL); |
|
if (!flat_buf) |
|
return -ENOMEM; |
|
|
|
flat_buf->vaddr = dma_alloc_coherent(real_dev, etr_buf->size, |
|
&flat_buf->daddr, GFP_KERNEL); |
|
if (!flat_buf->vaddr) { |
|
kfree(flat_buf); |
|
return -ENOMEM; |
|
} |
|
|
|
flat_buf->size = etr_buf->size; |
|
flat_buf->dev = &drvdata->csdev->dev; |
|
etr_buf->hwaddr = flat_buf->daddr; |
|
etr_buf->mode = ETR_MODE_FLAT; |
|
etr_buf->private = flat_buf; |
|
return 0; |
|
} |
|
|
|
static void tmc_etr_free_flat_buf(struct etr_buf *etr_buf) |
|
{ |
|
struct etr_flat_buf *flat_buf = etr_buf->private; |
|
|
|
if (flat_buf && flat_buf->daddr) { |
|
struct device *real_dev = flat_buf->dev->parent; |
|
|
|
dma_free_coherent(real_dev, flat_buf->size, |
|
flat_buf->vaddr, flat_buf->daddr); |
|
} |
|
kfree(flat_buf); |
|
} |
|
|
|
static void tmc_etr_sync_flat_buf(struct etr_buf *etr_buf, u64 rrp, u64 rwp) |
|
{ |
|
/* |
|
* Adjust the buffer to point to the beginning of the trace data |
|
* and update the available trace data. |
|
*/ |
|
etr_buf->offset = rrp - etr_buf->hwaddr; |
|
if (etr_buf->full) |
|
etr_buf->len = etr_buf->size; |
|
else |
|
etr_buf->len = rwp - rrp; |
|
} |
|
|
|
static ssize_t tmc_etr_get_data_flat_buf(struct etr_buf *etr_buf, |
|
u64 offset, size_t len, char **bufpp) |
|
{ |
|
struct etr_flat_buf *flat_buf = etr_buf->private; |
|
|
|
*bufpp = (char *)flat_buf->vaddr + offset; |
|
/* |
|
* tmc_etr_buf_get_data already adjusts the length to handle |
|
* buffer wrapping around. |
|
*/ |
|
return len; |
|
} |
|
|
|
static const struct etr_buf_operations etr_flat_buf_ops = { |
|
.alloc = tmc_etr_alloc_flat_buf, |
|
.free = tmc_etr_free_flat_buf, |
|
.sync = tmc_etr_sync_flat_buf, |
|
.get_data = tmc_etr_get_data_flat_buf, |
|
}; |
|
|
|
/* |
|
* tmc_etr_alloc_sg_buf: Allocate an SG buf @etr_buf. Setup the parameters |
|
* appropriately. |
|
*/ |
|
static int tmc_etr_alloc_sg_buf(struct tmc_drvdata *drvdata, |
|
struct etr_buf *etr_buf, int node, |
|
void **pages) |
|
{ |
|
struct etr_sg_table *etr_table; |
|
struct device *dev = &drvdata->csdev->dev; |
|
|
|
etr_table = tmc_init_etr_sg_table(dev, node, |
|
etr_buf->size, pages); |
|
if (IS_ERR(etr_table)) |
|
return -ENOMEM; |
|
etr_buf->hwaddr = etr_table->hwaddr; |
|
etr_buf->mode = ETR_MODE_ETR_SG; |
|
etr_buf->private = etr_table; |
|
return 0; |
|
} |
|
|
|
static void tmc_etr_free_sg_buf(struct etr_buf *etr_buf) |
|
{ |
|
struct etr_sg_table *etr_table = etr_buf->private; |
|
|
|
if (etr_table) { |
|
tmc_free_sg_table(etr_table->sg_table); |
|
kfree(etr_table); |
|
} |
|
} |
|
|
|
static ssize_t tmc_etr_get_data_sg_buf(struct etr_buf *etr_buf, u64 offset, |
|
size_t len, char **bufpp) |
|
{ |
|
struct etr_sg_table *etr_table = etr_buf->private; |
|
|
|
return tmc_sg_table_get_data(etr_table->sg_table, offset, len, bufpp); |
|
} |
|
|
|
static void tmc_etr_sync_sg_buf(struct etr_buf *etr_buf, u64 rrp, u64 rwp) |
|
{ |
|
long r_offset, w_offset; |
|
struct etr_sg_table *etr_table = etr_buf->private; |
|
struct tmc_sg_table *table = etr_table->sg_table; |
|
|
|
/* Convert hw address to offset in the buffer */ |
|
r_offset = tmc_sg_get_data_page_offset(table, rrp); |
|
if (r_offset < 0) { |
|
dev_warn(table->dev, |
|
"Unable to map RRP %llx to offset\n", rrp); |
|
etr_buf->len = 0; |
|
return; |
|
} |
|
|
|
w_offset = tmc_sg_get_data_page_offset(table, rwp); |
|
if (w_offset < 0) { |
|
dev_warn(table->dev, |
|
"Unable to map RWP %llx to offset\n", rwp); |
|
etr_buf->len = 0; |
|
return; |
|
} |
|
|
|
etr_buf->offset = r_offset; |
|
if (etr_buf->full) |
|
etr_buf->len = etr_buf->size; |
|
else |
|
etr_buf->len = ((w_offset < r_offset) ? etr_buf->size : 0) + |
|
w_offset - r_offset; |
|
tmc_sg_table_sync_data_range(table, r_offset, etr_buf->len); |
|
} |
|
|
|
static const struct etr_buf_operations etr_sg_buf_ops = { |
|
.alloc = tmc_etr_alloc_sg_buf, |
|
.free = tmc_etr_free_sg_buf, |
|
.sync = tmc_etr_sync_sg_buf, |
|
.get_data = tmc_etr_get_data_sg_buf, |
|
}; |
|
|
|
/* |
|
* TMC ETR could be connected to a CATU device, which can provide address |
|
* translation service. This is represented by the Output port of the TMC |
|
* (ETR) connected to the input port of the CATU. |
|
* |
|
* Returns : coresight_device ptr for the CATU device if a CATU is found. |
|
* : NULL otherwise. |
|
*/ |
|
struct coresight_device * |
|
tmc_etr_get_catu_device(struct tmc_drvdata *drvdata) |
|
{ |
|
int i; |
|
struct coresight_device *tmp, *etr = drvdata->csdev; |
|
|
|
if (!IS_ENABLED(CONFIG_CORESIGHT_CATU)) |
|
return NULL; |
|
|
|
for (i = 0; i < etr->pdata->nr_outport; i++) { |
|
tmp = etr->pdata->conns[i].child_dev; |
|
if (tmp && coresight_is_catu_device(tmp)) |
|
return tmp; |
|
} |
|
|
|
return NULL; |
|
} |
|
EXPORT_SYMBOL_GPL(tmc_etr_get_catu_device); |
|
|
|
static inline int tmc_etr_enable_catu(struct tmc_drvdata *drvdata, |
|
struct etr_buf *etr_buf) |
|
{ |
|
struct coresight_device *catu = tmc_etr_get_catu_device(drvdata); |
|
|
|
if (catu && helper_ops(catu)->enable) |
|
return helper_ops(catu)->enable(catu, etr_buf); |
|
return 0; |
|
} |
|
|
|
static inline void tmc_etr_disable_catu(struct tmc_drvdata *drvdata) |
|
{ |
|
struct coresight_device *catu = tmc_etr_get_catu_device(drvdata); |
|
|
|
if (catu && helper_ops(catu)->disable) |
|
helper_ops(catu)->disable(catu, drvdata->etr_buf); |
|
} |
|
|
|
static const struct etr_buf_operations *etr_buf_ops[] = { |
|
[ETR_MODE_FLAT] = &etr_flat_buf_ops, |
|
[ETR_MODE_ETR_SG] = &etr_sg_buf_ops, |
|
[ETR_MODE_CATU] = NULL, |
|
}; |
|
|
|
void tmc_etr_set_catu_ops(const struct etr_buf_operations *catu) |
|
{ |
|
etr_buf_ops[ETR_MODE_CATU] = catu; |
|
} |
|
EXPORT_SYMBOL_GPL(tmc_etr_set_catu_ops); |
|
|
|
void tmc_etr_remove_catu_ops(void) |
|
{ |
|
etr_buf_ops[ETR_MODE_CATU] = NULL; |
|
} |
|
EXPORT_SYMBOL_GPL(tmc_etr_remove_catu_ops); |
|
|
|
static inline int tmc_etr_mode_alloc_buf(int mode, |
|
struct tmc_drvdata *drvdata, |
|
struct etr_buf *etr_buf, int node, |
|
void **pages) |
|
{ |
|
int rc = -EINVAL; |
|
|
|
switch (mode) { |
|
case ETR_MODE_FLAT: |
|
case ETR_MODE_ETR_SG: |
|
case ETR_MODE_CATU: |
|
if (etr_buf_ops[mode] && etr_buf_ops[mode]->alloc) |
|
rc = etr_buf_ops[mode]->alloc(drvdata, etr_buf, |
|
node, pages); |
|
if (!rc) |
|
etr_buf->ops = etr_buf_ops[mode]; |
|
return rc; |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
/* |
|
* tmc_alloc_etr_buf: Allocate a buffer use by ETR. |
|
* @drvdata : ETR device details. |
|
* @size : size of the requested buffer. |
|
* @flags : Required properties for the buffer. |
|
* @node : Node for memory allocations. |
|
* @pages : An optional list of pages. |
|
*/ |
|
static struct etr_buf *tmc_alloc_etr_buf(struct tmc_drvdata *drvdata, |
|
ssize_t size, int flags, |
|
int node, void **pages) |
|
{ |
|
int rc = -ENOMEM; |
|
bool has_etr_sg, has_iommu; |
|
bool has_sg, has_catu; |
|
struct etr_buf *etr_buf; |
|
struct device *dev = &drvdata->csdev->dev; |
|
|
|
has_etr_sg = tmc_etr_has_cap(drvdata, TMC_ETR_SG); |
|
has_iommu = iommu_get_domain_for_dev(dev->parent); |
|
has_catu = !!tmc_etr_get_catu_device(drvdata); |
|
|
|
has_sg = has_catu || has_etr_sg; |
|
|
|
etr_buf = kzalloc(sizeof(*etr_buf), GFP_KERNEL); |
|
if (!etr_buf) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
etr_buf->size = size; |
|
|
|
/* |
|
* If we have to use an existing list of pages, we cannot reliably |
|
* use a contiguous DMA memory (even if we have an IOMMU). Otherwise, |
|
* we use the contiguous DMA memory if at least one of the following |
|
* conditions is true: |
|
* a) The ETR cannot use Scatter-Gather. |
|
* b) we have a backing IOMMU |
|
* c) The requested memory size is smaller (< 1M). |
|
* |
|
* Fallback to available mechanisms. |
|
* |
|
*/ |
|
if (!pages && |
|
(!has_sg || has_iommu || size < SZ_1M)) |
|
rc = tmc_etr_mode_alloc_buf(ETR_MODE_FLAT, drvdata, |
|
etr_buf, node, pages); |
|
if (rc && has_etr_sg) |
|
rc = tmc_etr_mode_alloc_buf(ETR_MODE_ETR_SG, drvdata, |
|
etr_buf, node, pages); |
|
if (rc && has_catu) |
|
rc = tmc_etr_mode_alloc_buf(ETR_MODE_CATU, drvdata, |
|
etr_buf, node, pages); |
|
if (rc) { |
|
kfree(etr_buf); |
|
return ERR_PTR(rc); |
|
} |
|
|
|
refcount_set(&etr_buf->refcount, 1); |
|
dev_dbg(dev, "allocated buffer of size %ldKB in mode %d\n", |
|
(unsigned long)size >> 10, etr_buf->mode); |
|
return etr_buf; |
|
} |
|
|
|
static void tmc_free_etr_buf(struct etr_buf *etr_buf) |
|
{ |
|
WARN_ON(!etr_buf->ops || !etr_buf->ops->free); |
|
etr_buf->ops->free(etr_buf); |
|
kfree(etr_buf); |
|
} |
|
|
|
/* |
|
* tmc_etr_buf_get_data: Get the pointer the trace data at @offset |
|
* with a maximum of @len bytes. |
|
* Returns: The size of the linear data available @pos, with *bufpp |
|
* updated to point to the buffer. |
|
*/ |
|
static ssize_t tmc_etr_buf_get_data(struct etr_buf *etr_buf, |
|
u64 offset, size_t len, char **bufpp) |
|
{ |
|
/* Adjust the length to limit this transaction to end of buffer */ |
|
len = (len < (etr_buf->size - offset)) ? len : etr_buf->size - offset; |
|
|
|
return etr_buf->ops->get_data(etr_buf, (u64)offset, len, bufpp); |
|
} |
|
|
|
static inline s64 |
|
tmc_etr_buf_insert_barrier_packet(struct etr_buf *etr_buf, u64 offset) |
|
{ |
|
ssize_t len; |
|
char *bufp; |
|
|
|
len = tmc_etr_buf_get_data(etr_buf, offset, |
|
CORESIGHT_BARRIER_PKT_SIZE, &bufp); |
|
if (WARN_ON(len < CORESIGHT_BARRIER_PKT_SIZE)) |
|
return -EINVAL; |
|
coresight_insert_barrier_packet(bufp); |
|
return offset + CORESIGHT_BARRIER_PKT_SIZE; |
|
} |
|
|
|
/* |
|
* tmc_sync_etr_buf: Sync the trace buffer availability with drvdata. |
|
* Makes sure the trace data is synced to the memory for consumption. |
|
* @etr_buf->offset will hold the offset to the beginning of the trace data |
|
* within the buffer, with @etr_buf->len bytes to consume. |
|
*/ |
|
static void tmc_sync_etr_buf(struct tmc_drvdata *drvdata) |
|
{ |
|
struct etr_buf *etr_buf = drvdata->etr_buf; |
|
u64 rrp, rwp; |
|
u32 status; |
|
|
|
rrp = tmc_read_rrp(drvdata); |
|
rwp = tmc_read_rwp(drvdata); |
|
status = readl_relaxed(drvdata->base + TMC_STS); |
|
|
|
/* |
|
* If there were memory errors in the session, truncate the |
|
* buffer. |
|
*/ |
|
if (WARN_ON_ONCE(status & TMC_STS_MEMERR)) { |
|
dev_dbg(&drvdata->csdev->dev, |
|
"tmc memory error detected, truncating buffer\n"); |
|
etr_buf->len = 0; |
|
etr_buf->full = false; |
|
return; |
|
} |
|
|
|
etr_buf->full = !!(status & TMC_STS_FULL); |
|
|
|
WARN_ON(!etr_buf->ops || !etr_buf->ops->sync); |
|
|
|
etr_buf->ops->sync(etr_buf, rrp, rwp); |
|
} |
|
|
|
static void __tmc_etr_enable_hw(struct tmc_drvdata *drvdata) |
|
{ |
|
u32 axictl, sts; |
|
struct etr_buf *etr_buf = drvdata->etr_buf; |
|
|
|
CS_UNLOCK(drvdata->base); |
|
|
|
/* Wait for TMCSReady bit to be set */ |
|
tmc_wait_for_tmcready(drvdata); |
|
|
|
writel_relaxed(etr_buf->size / 4, drvdata->base + TMC_RSZ); |
|
writel_relaxed(TMC_MODE_CIRCULAR_BUFFER, drvdata->base + TMC_MODE); |
|
|
|
axictl = readl_relaxed(drvdata->base + TMC_AXICTL); |
|
axictl &= ~TMC_AXICTL_CLEAR_MASK; |
|
axictl |= (TMC_AXICTL_PROT_CTL_B1 | TMC_AXICTL_WR_BURST_16); |
|
axictl |= TMC_AXICTL_AXCACHE_OS; |
|
|
|
if (tmc_etr_has_cap(drvdata, TMC_ETR_AXI_ARCACHE)) { |
|
axictl &= ~TMC_AXICTL_ARCACHE_MASK; |
|
axictl |= TMC_AXICTL_ARCACHE_OS; |
|
} |
|
|
|
if (etr_buf->mode == ETR_MODE_ETR_SG) |
|
axictl |= TMC_AXICTL_SCT_GAT_MODE; |
|
|
|
writel_relaxed(axictl, drvdata->base + TMC_AXICTL); |
|
tmc_write_dba(drvdata, etr_buf->hwaddr); |
|
/* |
|
* If the TMC pointers must be programmed before the session, |
|
* we have to set it properly (i.e, RRP/RWP to base address and |
|
* STS to "not full"). |
|
*/ |
|
if (tmc_etr_has_cap(drvdata, TMC_ETR_SAVE_RESTORE)) { |
|
tmc_write_rrp(drvdata, etr_buf->hwaddr); |
|
tmc_write_rwp(drvdata, etr_buf->hwaddr); |
|
sts = readl_relaxed(drvdata->base + TMC_STS) & ~TMC_STS_FULL; |
|
writel_relaxed(sts, drvdata->base + TMC_STS); |
|
} |
|
|
|
writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI | |
|
TMC_FFCR_FON_FLIN | TMC_FFCR_FON_TRIG_EVT | |
|
TMC_FFCR_TRIGON_TRIGIN, |
|
drvdata->base + TMC_FFCR); |
|
writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG); |
|
tmc_enable_hw(drvdata); |
|
|
|
CS_LOCK(drvdata->base); |
|
} |
|
|
|
static int tmc_etr_enable_hw(struct tmc_drvdata *drvdata, |
|
struct etr_buf *etr_buf) |
|
{ |
|
int rc; |
|
|
|
/* Callers should provide an appropriate buffer for use */ |
|
if (WARN_ON(!etr_buf)) |
|
return -EINVAL; |
|
|
|
if ((etr_buf->mode == ETR_MODE_ETR_SG) && |
|
WARN_ON(!tmc_etr_has_cap(drvdata, TMC_ETR_SG))) |
|
return -EINVAL; |
|
|
|
if (WARN_ON(drvdata->etr_buf)) |
|
return -EBUSY; |
|
|
|
/* |
|
* If this ETR is connected to a CATU, enable it before we turn |
|
* this on. |
|
*/ |
|
rc = tmc_etr_enable_catu(drvdata, etr_buf); |
|
if (rc) |
|
return rc; |
|
rc = coresight_claim_device(drvdata->csdev); |
|
if (!rc) { |
|
drvdata->etr_buf = etr_buf; |
|
__tmc_etr_enable_hw(drvdata); |
|
} |
|
|
|
return rc; |
|
} |
|
|
|
/* |
|
* Return the available trace data in the buffer (starts at etr_buf->offset, |
|
* limited by etr_buf->len) from @pos, with a maximum limit of @len, |
|
* also updating the @bufpp on where to find it. Since the trace data |
|
* starts at anywhere in the buffer, depending on the RRP, we adjust the |
|
* @len returned to handle buffer wrapping around. |
|
* |
|
* We are protected here by drvdata->reading != 0, which ensures the |
|
* sysfs_buf stays alive. |
|
*/ |
|
ssize_t tmc_etr_get_sysfs_trace(struct tmc_drvdata *drvdata, |
|
loff_t pos, size_t len, char **bufpp) |
|
{ |
|
s64 offset; |
|
ssize_t actual = len; |
|
struct etr_buf *etr_buf = drvdata->sysfs_buf; |
|
|
|
if (pos + actual > etr_buf->len) |
|
actual = etr_buf->len - pos; |
|
if (actual <= 0) |
|
return actual; |
|
|
|
/* Compute the offset from which we read the data */ |
|
offset = etr_buf->offset + pos; |
|
if (offset >= etr_buf->size) |
|
offset -= etr_buf->size; |
|
return tmc_etr_buf_get_data(etr_buf, offset, actual, bufpp); |
|
} |
|
|
|
static struct etr_buf * |
|
tmc_etr_setup_sysfs_buf(struct tmc_drvdata *drvdata) |
|
{ |
|
return tmc_alloc_etr_buf(drvdata, drvdata->size, |
|
0, cpu_to_node(0), NULL); |
|
} |
|
|
|
static void |
|
tmc_etr_free_sysfs_buf(struct etr_buf *buf) |
|
{ |
|
if (buf) |
|
tmc_free_etr_buf(buf); |
|
} |
|
|
|
static void tmc_etr_sync_sysfs_buf(struct tmc_drvdata *drvdata) |
|
{ |
|
struct etr_buf *etr_buf = drvdata->etr_buf; |
|
|
|
if (WARN_ON(drvdata->sysfs_buf != etr_buf)) { |
|
tmc_etr_free_sysfs_buf(drvdata->sysfs_buf); |
|
drvdata->sysfs_buf = NULL; |
|
} else { |
|
tmc_sync_etr_buf(drvdata); |
|
/* |
|
* Insert barrier packets at the beginning, if there was |
|
* an overflow. |
|
*/ |
|
if (etr_buf->full) |
|
tmc_etr_buf_insert_barrier_packet(etr_buf, |
|
etr_buf->offset); |
|
} |
|
} |
|
|
|
static void __tmc_etr_disable_hw(struct tmc_drvdata *drvdata) |
|
{ |
|
CS_UNLOCK(drvdata->base); |
|
|
|
tmc_flush_and_stop(drvdata); |
|
/* |
|
* When operating in sysFS mode the content of the buffer needs to be |
|
* read before the TMC is disabled. |
|
*/ |
|
if (drvdata->mode == CS_MODE_SYSFS) |
|
tmc_etr_sync_sysfs_buf(drvdata); |
|
|
|
tmc_disable_hw(drvdata); |
|
|
|
CS_LOCK(drvdata->base); |
|
|
|
} |
|
|
|
void tmc_etr_disable_hw(struct tmc_drvdata *drvdata) |
|
{ |
|
__tmc_etr_disable_hw(drvdata); |
|
/* Disable CATU device if this ETR is connected to one */ |
|
tmc_etr_disable_catu(drvdata); |
|
coresight_disclaim_device(drvdata->csdev); |
|
/* Reset the ETR buf used by hardware */ |
|
drvdata->etr_buf = NULL; |
|
} |
|
|
|
static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev) |
|
{ |
|
int ret = 0; |
|
unsigned long flags; |
|
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
|
struct etr_buf *sysfs_buf = NULL, *new_buf = NULL, *free_buf = NULL; |
|
|
|
/* |
|
* If we are enabling the ETR from disabled state, we need to make |
|
* sure we have a buffer with the right size. The etr_buf is not reset |
|
* immediately after we stop the tracing in SYSFS mode as we wait for |
|
* the user to collect the data. We may be able to reuse the existing |
|
* buffer, provided the size matches. Any allocation has to be done |
|
* with the lock released. |
|
*/ |
|
spin_lock_irqsave(&drvdata->spinlock, flags); |
|
sysfs_buf = READ_ONCE(drvdata->sysfs_buf); |
|
if (!sysfs_buf || (sysfs_buf->size != drvdata->size)) { |
|
spin_unlock_irqrestore(&drvdata->spinlock, flags); |
|
|
|
/* Allocate memory with the locks released */ |
|
free_buf = new_buf = tmc_etr_setup_sysfs_buf(drvdata); |
|
if (IS_ERR(new_buf)) |
|
return PTR_ERR(new_buf); |
|
|
|
/* Let's try again */ |
|
spin_lock_irqsave(&drvdata->spinlock, flags); |
|
} |
|
|
|
if (drvdata->reading || drvdata->mode == CS_MODE_PERF) { |
|
ret = -EBUSY; |
|
goto out; |
|
} |
|
|
|
/* |
|
* In sysFS mode we can have multiple writers per sink. Since this |
|
* sink is already enabled no memory is needed and the HW need not be |
|
* touched, even if the buffer size has changed. |
|
*/ |
|
if (drvdata->mode == CS_MODE_SYSFS) { |
|
atomic_inc(csdev->refcnt); |
|
goto out; |
|
} |
|
|
|
/* |
|
* If we don't have a buffer or it doesn't match the requested size, |
|
* use the buffer allocated above. Otherwise reuse the existing buffer. |
|
*/ |
|
sysfs_buf = READ_ONCE(drvdata->sysfs_buf); |
|
if (!sysfs_buf || (new_buf && sysfs_buf->size != new_buf->size)) { |
|
free_buf = sysfs_buf; |
|
drvdata->sysfs_buf = new_buf; |
|
} |
|
|
|
ret = tmc_etr_enable_hw(drvdata, drvdata->sysfs_buf); |
|
if (!ret) { |
|
drvdata->mode = CS_MODE_SYSFS; |
|
atomic_inc(csdev->refcnt); |
|
} |
|
out: |
|
spin_unlock_irqrestore(&drvdata->spinlock, flags); |
|
|
|
/* Free memory outside the spinlock if need be */ |
|
if (free_buf) |
|
tmc_etr_free_sysfs_buf(free_buf); |
|
|
|
if (!ret) |
|
dev_dbg(&csdev->dev, "TMC-ETR enabled\n"); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* alloc_etr_buf: Allocate ETR buffer for use by perf. |
|
* The size of the hardware buffer is dependent on the size configured |
|
* via sysfs and the perf ring buffer size. We prefer to allocate the |
|
* largest possible size, scaling down the size by half until it |
|
* reaches a minimum limit (1M), beyond which we give up. |
|
*/ |
|
static struct etr_buf * |
|
alloc_etr_buf(struct tmc_drvdata *drvdata, struct perf_event *event, |
|
int nr_pages, void **pages, bool snapshot) |
|
{ |
|
int node; |
|
struct etr_buf *etr_buf; |
|
unsigned long size; |
|
|
|
node = (event->cpu == -1) ? NUMA_NO_NODE : cpu_to_node(event->cpu); |
|
/* |
|
* Try to match the perf ring buffer size if it is larger |
|
* than the size requested via sysfs. |
|
*/ |
|
if ((nr_pages << PAGE_SHIFT) > drvdata->size) { |
|
etr_buf = tmc_alloc_etr_buf(drvdata, (nr_pages << PAGE_SHIFT), |
|
0, node, NULL); |
|
if (!IS_ERR(etr_buf)) |
|
goto done; |
|
} |
|
|
|
/* |
|
* Else switch to configured size for this ETR |
|
* and scale down until we hit the minimum limit. |
|
*/ |
|
size = drvdata->size; |
|
do { |
|
etr_buf = tmc_alloc_etr_buf(drvdata, size, 0, node, NULL); |
|
if (!IS_ERR(etr_buf)) |
|
goto done; |
|
size /= 2; |
|
} while (size >= TMC_ETR_PERF_MIN_BUF_SIZE); |
|
|
|
return ERR_PTR(-ENOMEM); |
|
|
|
done: |
|
return etr_buf; |
|
} |
|
|
|
static struct etr_buf * |
|
get_perf_etr_buf_cpu_wide(struct tmc_drvdata *drvdata, |
|
struct perf_event *event, int nr_pages, |
|
void **pages, bool snapshot) |
|
{ |
|
int ret; |
|
pid_t pid = task_pid_nr(event->owner); |
|
struct etr_buf *etr_buf; |
|
|
|
retry: |
|
/* |
|
* An etr_perf_buffer is associated with an event and holds a reference |
|
* to the AUX ring buffer that was created for that event. In CPU-wide |
|
* N:1 mode multiple events (one per CPU), each with its own AUX ring |
|
* buffer, share a sink. As such an etr_perf_buffer is created for each |
|
* event but a single etr_buf associated with the ETR is shared between |
|
* them. The last event in a trace session will copy the content of the |
|
* etr_buf to its AUX ring buffer. Ring buffer associated to other |
|
* events are simply not used an freed as events are destoyed. We still |
|
* need to allocate a ring buffer for each event since we don't know |
|
* which event will be last. |
|
*/ |
|
|
|
/* |
|
* The first thing to do here is check if an etr_buf has already been |
|
* allocated for this session. If so it is shared with this event, |
|
* otherwise it is created. |
|
*/ |
|
mutex_lock(&drvdata->idr_mutex); |
|
etr_buf = idr_find(&drvdata->idr, pid); |
|
if (etr_buf) { |
|
refcount_inc(&etr_buf->refcount); |
|
mutex_unlock(&drvdata->idr_mutex); |
|
return etr_buf; |
|
} |
|
|
|
/* If we made it here no buffer has been allocated, do so now. */ |
|
mutex_unlock(&drvdata->idr_mutex); |
|
|
|
etr_buf = alloc_etr_buf(drvdata, event, nr_pages, pages, snapshot); |
|
if (IS_ERR(etr_buf)) |
|
return etr_buf; |
|
|
|
/* Now that we have a buffer, add it to the IDR. */ |
|
mutex_lock(&drvdata->idr_mutex); |
|
ret = idr_alloc(&drvdata->idr, etr_buf, pid, pid + 1, GFP_KERNEL); |
|
mutex_unlock(&drvdata->idr_mutex); |
|
|
|
/* Another event with this session ID has allocated this buffer. */ |
|
if (ret == -ENOSPC) { |
|
tmc_free_etr_buf(etr_buf); |
|
goto retry; |
|
} |
|
|
|
/* The IDR can't allocate room for a new session, abandon ship. */ |
|
if (ret == -ENOMEM) { |
|
tmc_free_etr_buf(etr_buf); |
|
return ERR_PTR(ret); |
|
} |
|
|
|
|
|
return etr_buf; |
|
} |
|
|
|
static struct etr_buf * |
|
get_perf_etr_buf_per_thread(struct tmc_drvdata *drvdata, |
|
struct perf_event *event, int nr_pages, |
|
void **pages, bool snapshot) |
|
{ |
|
/* |
|
* In per-thread mode the etr_buf isn't shared, so just go ahead |
|
* with memory allocation. |
|
*/ |
|
return alloc_etr_buf(drvdata, event, nr_pages, pages, snapshot); |
|
} |
|
|
|
static struct etr_buf * |
|
get_perf_etr_buf(struct tmc_drvdata *drvdata, struct perf_event *event, |
|
int nr_pages, void **pages, bool snapshot) |
|
{ |
|
if (event->cpu == -1) |
|
return get_perf_etr_buf_per_thread(drvdata, event, nr_pages, |
|
pages, snapshot); |
|
|
|
return get_perf_etr_buf_cpu_wide(drvdata, event, nr_pages, |
|
pages, snapshot); |
|
} |
|
|
|
static struct etr_perf_buffer * |
|
tmc_etr_setup_perf_buf(struct tmc_drvdata *drvdata, struct perf_event *event, |
|
int nr_pages, void **pages, bool snapshot) |
|
{ |
|
int node; |
|
struct etr_buf *etr_buf; |
|
struct etr_perf_buffer *etr_perf; |
|
|
|
node = (event->cpu == -1) ? NUMA_NO_NODE : cpu_to_node(event->cpu); |
|
|
|
etr_perf = kzalloc_node(sizeof(*etr_perf), GFP_KERNEL, node); |
|
if (!etr_perf) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
etr_buf = get_perf_etr_buf(drvdata, event, nr_pages, pages, snapshot); |
|
if (!IS_ERR(etr_buf)) |
|
goto done; |
|
|
|
kfree(etr_perf); |
|
return ERR_PTR(-ENOMEM); |
|
|
|
done: |
|
/* |
|
* Keep a reference to the ETR this buffer has been allocated for |
|
* in order to have access to the IDR in tmc_free_etr_buffer(). |
|
*/ |
|
etr_perf->drvdata = drvdata; |
|
etr_perf->etr_buf = etr_buf; |
|
|
|
return etr_perf; |
|
} |
|
|
|
|
|
static void *tmc_alloc_etr_buffer(struct coresight_device *csdev, |
|
struct perf_event *event, void **pages, |
|
int nr_pages, bool snapshot) |
|
{ |
|
struct etr_perf_buffer *etr_perf; |
|
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
|
|
|
etr_perf = tmc_etr_setup_perf_buf(drvdata, event, |
|
nr_pages, pages, snapshot); |
|
if (IS_ERR(etr_perf)) { |
|
dev_dbg(&csdev->dev, "Unable to allocate ETR buffer\n"); |
|
return NULL; |
|
} |
|
|
|
etr_perf->pid = task_pid_nr(event->owner); |
|
etr_perf->snapshot = snapshot; |
|
etr_perf->nr_pages = nr_pages; |
|
etr_perf->pages = pages; |
|
|
|
return etr_perf; |
|
} |
|
|
|
static void tmc_free_etr_buffer(void *config) |
|
{ |
|
struct etr_perf_buffer *etr_perf = config; |
|
struct tmc_drvdata *drvdata = etr_perf->drvdata; |
|
struct etr_buf *buf, *etr_buf = etr_perf->etr_buf; |
|
|
|
if (!etr_buf) |
|
goto free_etr_perf_buffer; |
|
|
|
mutex_lock(&drvdata->idr_mutex); |
|
/* If we are not the last one to use the buffer, don't touch it. */ |
|
if (!refcount_dec_and_test(&etr_buf->refcount)) { |
|
mutex_unlock(&drvdata->idr_mutex); |
|
goto free_etr_perf_buffer; |
|
} |
|
|
|
/* We are the last one, remove from the IDR and free the buffer. */ |
|
buf = idr_remove(&drvdata->idr, etr_perf->pid); |
|
mutex_unlock(&drvdata->idr_mutex); |
|
|
|
/* |
|
* Something went very wrong if the buffer associated with this ID |
|
* is not the same in the IDR. Leak to avoid use after free. |
|
*/ |
|
if (buf && WARN_ON(buf != etr_buf)) |
|
goto free_etr_perf_buffer; |
|
|
|
tmc_free_etr_buf(etr_perf->etr_buf); |
|
|
|
free_etr_perf_buffer: |
|
kfree(etr_perf); |
|
} |
|
|
|
/* |
|
* tmc_etr_sync_perf_buffer: Copy the actual trace data from the hardware |
|
* buffer to the perf ring buffer. |
|
*/ |
|
static void tmc_etr_sync_perf_buffer(struct etr_perf_buffer *etr_perf, |
|
unsigned long src_offset, |
|
unsigned long to_copy) |
|
{ |
|
long bytes; |
|
long pg_idx, pg_offset; |
|
unsigned long head = etr_perf->head; |
|
char **dst_pages, *src_buf; |
|
struct etr_buf *etr_buf = etr_perf->etr_buf; |
|
|
|
head = etr_perf->head; |
|
pg_idx = head >> PAGE_SHIFT; |
|
pg_offset = head & (PAGE_SIZE - 1); |
|
dst_pages = (char **)etr_perf->pages; |
|
|
|
while (to_copy > 0) { |
|
/* |
|
* In one iteration, we can copy minimum of : |
|
* 1) what is available in the source buffer, |
|
* 2) what is available in the source buffer, before it |
|
* wraps around. |
|
* 3) what is available in the destination page. |
|
* in one iteration. |
|
*/ |
|
if (src_offset >= etr_buf->size) |
|
src_offset -= etr_buf->size; |
|
bytes = tmc_etr_buf_get_data(etr_buf, src_offset, to_copy, |
|
&src_buf); |
|
if (WARN_ON_ONCE(bytes <= 0)) |
|
break; |
|
bytes = min(bytes, (long)(PAGE_SIZE - pg_offset)); |
|
|
|
memcpy(dst_pages[pg_idx] + pg_offset, src_buf, bytes); |
|
|
|
to_copy -= bytes; |
|
|
|
/* Move destination pointers */ |
|
pg_offset += bytes; |
|
if (pg_offset == PAGE_SIZE) { |
|
pg_offset = 0; |
|
if (++pg_idx == etr_perf->nr_pages) |
|
pg_idx = 0; |
|
} |
|
|
|
/* Move source pointers */ |
|
src_offset += bytes; |
|
} |
|
} |
|
|
|
/* |
|
* tmc_update_etr_buffer : Update the perf ring buffer with the |
|
* available trace data. We use software double buffering at the moment. |
|
* |
|
* TODO: Add support for reusing the perf ring buffer. |
|
*/ |
|
static unsigned long |
|
tmc_update_etr_buffer(struct coresight_device *csdev, |
|
struct perf_output_handle *handle, |
|
void *config) |
|
{ |
|
bool lost = false; |
|
unsigned long flags, offset, size = 0; |
|
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
|
struct etr_perf_buffer *etr_perf = config; |
|
struct etr_buf *etr_buf = etr_perf->etr_buf; |
|
|
|
spin_lock_irqsave(&drvdata->spinlock, flags); |
|
|
|
/* Don't do anything if another tracer is using this sink */ |
|
if (atomic_read(csdev->refcnt) != 1) { |
|
spin_unlock_irqrestore(&drvdata->spinlock, flags); |
|
goto out; |
|
} |
|
|
|
if (WARN_ON(drvdata->perf_buf != etr_buf)) { |
|
lost = true; |
|
spin_unlock_irqrestore(&drvdata->spinlock, flags); |
|
goto out; |
|
} |
|
|
|
CS_UNLOCK(drvdata->base); |
|
|
|
tmc_flush_and_stop(drvdata); |
|
tmc_sync_etr_buf(drvdata); |
|
|
|
CS_LOCK(drvdata->base); |
|
spin_unlock_irqrestore(&drvdata->spinlock, flags); |
|
|
|
lost = etr_buf->full; |
|
offset = etr_buf->offset; |
|
size = etr_buf->len; |
|
|
|
/* |
|
* The ETR buffer may be bigger than the space available in the |
|
* perf ring buffer (handle->size). If so advance the offset so that we |
|
* get the latest trace data. In snapshot mode none of that matters |
|
* since we are expected to clobber stale data in favour of the latest |
|
* traces. |
|
*/ |
|
if (!etr_perf->snapshot && size > handle->size) { |
|
u32 mask = tmc_get_memwidth_mask(drvdata); |
|
|
|
/* |
|
* Make sure the new size is aligned in accordance with the |
|
* requirement explained in function tmc_get_memwidth_mask(). |
|
*/ |
|
size = handle->size & mask; |
|
offset = etr_buf->offset + etr_buf->len - size; |
|
|
|
if (offset >= etr_buf->size) |
|
offset -= etr_buf->size; |
|
lost = true; |
|
} |
|
|
|
/* Insert barrier packets at the beginning, if there was an overflow */ |
|
if (lost) |
|
tmc_etr_buf_insert_barrier_packet(etr_buf, offset); |
|
tmc_etr_sync_perf_buffer(etr_perf, offset, size); |
|
|
|
/* |
|
* In snapshot mode we simply increment the head by the number of byte |
|
* that were written. User space function cs_etm_find_snapshot() will |
|
* figure out how many bytes to get from the AUX buffer based on the |
|
* position of the head. |
|
*/ |
|
if (etr_perf->snapshot) |
|
handle->head += size; |
|
out: |
|
/* |
|
* Don't set the TRUNCATED flag in snapshot mode because 1) the |
|
* captured buffer is expected to be truncated and 2) a full buffer |
|
* prevents the event from being re-enabled by the perf core, |
|
* resulting in stale data being send to user space. |
|
*/ |
|
if (!etr_perf->snapshot && lost) |
|
perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED); |
|
return size; |
|
} |
|
|
|
static int tmc_enable_etr_sink_perf(struct coresight_device *csdev, void *data) |
|
{ |
|
int rc = 0; |
|
pid_t pid; |
|
unsigned long flags; |
|
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
|
struct perf_output_handle *handle = data; |
|
struct etr_perf_buffer *etr_perf = etm_perf_sink_config(handle); |
|
|
|
spin_lock_irqsave(&drvdata->spinlock, flags); |
|
/* Don't use this sink if it is already claimed by sysFS */ |
|
if (drvdata->mode == CS_MODE_SYSFS) { |
|
rc = -EBUSY; |
|
goto unlock_out; |
|
} |
|
|
|
if (WARN_ON(!etr_perf || !etr_perf->etr_buf)) { |
|
rc = -EINVAL; |
|
goto unlock_out; |
|
} |
|
|
|
/* Get a handle on the pid of the process to monitor */ |
|
pid = etr_perf->pid; |
|
|
|
/* Do not proceed if this device is associated with another session */ |
|
if (drvdata->pid != -1 && drvdata->pid != pid) { |
|
rc = -EBUSY; |
|
goto unlock_out; |
|
} |
|
|
|
etr_perf->head = PERF_IDX2OFF(handle->head, etr_perf); |
|
|
|
/* |
|
* No HW configuration is needed if the sink is already in |
|
* use for this session. |
|
*/ |
|
if (drvdata->pid == pid) { |
|
atomic_inc(csdev->refcnt); |
|
goto unlock_out; |
|
} |
|
|
|
rc = tmc_etr_enable_hw(drvdata, etr_perf->etr_buf); |
|
if (!rc) { |
|
/* Associate with monitored process. */ |
|
drvdata->pid = pid; |
|
drvdata->mode = CS_MODE_PERF; |
|
drvdata->perf_buf = etr_perf->etr_buf; |
|
atomic_inc(csdev->refcnt); |
|
} |
|
|
|
unlock_out: |
|
spin_unlock_irqrestore(&drvdata->spinlock, flags); |
|
return rc; |
|
} |
|
|
|
static int tmc_enable_etr_sink(struct coresight_device *csdev, |
|
u32 mode, void *data) |
|
{ |
|
switch (mode) { |
|
case CS_MODE_SYSFS: |
|
return tmc_enable_etr_sink_sysfs(csdev); |
|
case CS_MODE_PERF: |
|
return tmc_enable_etr_sink_perf(csdev, data); |
|
} |
|
|
|
/* We shouldn't be here */ |
|
return -EINVAL; |
|
} |
|
|
|
static int tmc_disable_etr_sink(struct coresight_device *csdev) |
|
{ |
|
unsigned long flags; |
|
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
|
|
|
spin_lock_irqsave(&drvdata->spinlock, flags); |
|
|
|
if (drvdata->reading) { |
|
spin_unlock_irqrestore(&drvdata->spinlock, flags); |
|
return -EBUSY; |
|
} |
|
|
|
if (atomic_dec_return(csdev->refcnt)) { |
|
spin_unlock_irqrestore(&drvdata->spinlock, flags); |
|
return -EBUSY; |
|
} |
|
|
|
/* Complain if we (somehow) got out of sync */ |
|
WARN_ON_ONCE(drvdata->mode == CS_MODE_DISABLED); |
|
tmc_etr_disable_hw(drvdata); |
|
/* Dissociate from monitored process. */ |
|
drvdata->pid = -1; |
|
drvdata->mode = CS_MODE_DISABLED; |
|
/* Reset perf specific data */ |
|
drvdata->perf_buf = NULL; |
|
|
|
spin_unlock_irqrestore(&drvdata->spinlock, flags); |
|
|
|
dev_dbg(&csdev->dev, "TMC-ETR disabled\n"); |
|
return 0; |
|
} |
|
|
|
static const struct coresight_ops_sink tmc_etr_sink_ops = { |
|
.enable = tmc_enable_etr_sink, |
|
.disable = tmc_disable_etr_sink, |
|
.alloc_buffer = tmc_alloc_etr_buffer, |
|
.update_buffer = tmc_update_etr_buffer, |
|
.free_buffer = tmc_free_etr_buffer, |
|
}; |
|
|
|
const struct coresight_ops tmc_etr_cs_ops = { |
|
.sink_ops = &tmc_etr_sink_ops, |
|
}; |
|
|
|
int tmc_read_prepare_etr(struct tmc_drvdata *drvdata) |
|
{ |
|
int ret = 0; |
|
unsigned long flags; |
|
|
|
/* config types are set a boot time and never change */ |
|
if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETR)) |
|
return -EINVAL; |
|
|
|
spin_lock_irqsave(&drvdata->spinlock, flags); |
|
if (drvdata->reading) { |
|
ret = -EBUSY; |
|
goto out; |
|
} |
|
|
|
/* |
|
* We can safely allow reads even if the ETR is operating in PERF mode, |
|
* since the sysfs session is captured in mode specific data. |
|
* If drvdata::sysfs_data is NULL the trace data has been read already. |
|
*/ |
|
if (!drvdata->sysfs_buf) { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
/* Disable the TMC if we are trying to read from a running session. */ |
|
if (drvdata->mode == CS_MODE_SYSFS) |
|
__tmc_etr_disable_hw(drvdata); |
|
|
|
drvdata->reading = true; |
|
out: |
|
spin_unlock_irqrestore(&drvdata->spinlock, flags); |
|
|
|
return ret; |
|
} |
|
|
|
int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata) |
|
{ |
|
unsigned long flags; |
|
struct etr_buf *sysfs_buf = NULL; |
|
|
|
/* config types are set a boot time and never change */ |
|
if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETR)) |
|
return -EINVAL; |
|
|
|
spin_lock_irqsave(&drvdata->spinlock, flags); |
|
|
|
/* RE-enable the TMC if need be */ |
|
if (drvdata->mode == CS_MODE_SYSFS) { |
|
/* |
|
* The trace run will continue with the same allocated trace |
|
* buffer. Since the tracer is still enabled drvdata::buf can't |
|
* be NULL. |
|
*/ |
|
__tmc_etr_enable_hw(drvdata); |
|
} else { |
|
/* |
|
* The ETR is not tracing and the buffer was just read. |
|
* As such prepare to free the trace buffer. |
|
*/ |
|
sysfs_buf = drvdata->sysfs_buf; |
|
drvdata->sysfs_buf = NULL; |
|
} |
|
|
|
drvdata->reading = false; |
|
spin_unlock_irqrestore(&drvdata->spinlock, flags); |
|
|
|
/* Free allocated memory out side of the spinlock */ |
|
if (sysfs_buf) |
|
tmc_etr_free_sysfs_buf(sysfs_buf); |
|
|
|
return 0; |
|
}
|
|
|