From c874bf59add0e6ed1d5d8c1753b9b66d51e3f640 Mon Sep 17 00:00:00 2001 From: Loic Pallardy Date: Fri, 27 Jul 2018 15:14:45 +0200 Subject: remoteproc: add helper function to check carveout device address This patch introduces a function to verify that a specified carveout is fitting request device address and associated length Signed-off-by: Loic Pallardy Signed-off-by: Bjorn Andersson --- drivers/remoteproc/remoteproc_core.c | 47 ++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) (limited to 'drivers/remoteproc') diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index d7a623b8801c..a0a5e32935bc 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -259,6 +259,53 @@ rproc_find_carveout_by_name(struct rproc *rproc, const char *name, ...) return mem; } +/** + * rproc_check_carveout_da() - Check specified carveout da configuration + * @rproc: handle of a remote processor + * @mem: pointer on carveout to check + * @da: area device address + * @len: associated area size + * + * This function is a helper function to verify requested device area (couple + * da, len) is part of specified carevout. + * + * Return: 0 if carveout match request else -ENOMEM + */ +int rproc_check_carveout_da(struct rproc *rproc, struct rproc_mem_entry *mem, + u32 da, u32 len) +{ + struct device *dev = &rproc->dev; + int delta = 0; + + /* Check requested resource length */ + if (len > mem->len) { + dev_err(dev, "Registered carveout doesn't fit len request\n"); + return -ENOMEM; + } + + if (da != FW_RSC_ADDR_ANY && mem->da == FW_RSC_ADDR_ANY) { + /* Update existing carveout da */ + mem->da = da; + } else if (da != FW_RSC_ADDR_ANY && mem->da != FW_RSC_ADDR_ANY) { + delta = da - mem->da; + + /* Check requested resource belongs to registered carveout */ + if (delta < 0) { + dev_err(dev, + "Registered carveout doesn't fit da request\n"); + return -ENOMEM; + } + + if (delta + len > mem->len) { + dev_err(dev, + "Registered carveout doesn't fit len request\n"); + return -ENOMEM; + } + } + + return 0; +} + int rproc_alloc_vring(struct rproc_vdev *rvdev, int i) { struct rproc *rproc = rvdev->rproc; -- cgit v1.2.3-59-g8ed1b