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spi_flash: fix stale read issue for memory mapped partition

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On flash program operation (either erase or write), if corresponding address has
cache mapping present then cache is explicitly flushed (for both pro and app cpu)

Closes https://github.com/espressif/esp-idf/issues/2146
This commit is contained in:
Mahavir Jain
2019-03-08 11:00:49 +05:30
committed by bot
parent dca5ed2263
commit 30d2f13358
4 changed files with 72 additions and 101 deletions
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10
components/spi_flash/cache_utils.h
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@@ -48,12 +48,10 @@ void spi_flash_disable_interrupts_caches_and_other_cpu_no_os();
// This function is implied to be called when other CPU is not running or running code from IRAM.
void spi_flash_enable_interrupts_caches_no_os();
// Mark the pages containing a flash region as having been
// erased or written to. This means the flash cache needs
// to be evicted before these pages can be flash_mmap()ed again,
// as they may contain stale data
//
// Flushes cache if address range has corresponding valid cache mappings
// Recommended to use post flash program operation (erase or write)
// Only call this while holding spi_flash_op_lock()
void spi_flash_mark_modified_region(uint32_t start_addr, uint32_t length);
// Returns true if cache was flushed, false otherwise
bool spi_flash_check_and_flush_cache(uint32_t start_addr, uint32_t length);
#endif //ESP_SPI_FLASH_CACHE_UTILS_H