From 161ff45de6aec981ac4a434fa45207273e875422 Mon Sep 17 00:00:00 2001 From: Sibi Sankar Date: Wed, 4 Nov 2020 12:33:42 +0530 Subject: [PATCH 5/7] remoteproc: qcom_q6v5_mss: map/unmap MBA region before/after use The application processor accessing the MBA region after assigning it to the remote Q6 would lead to an XPU violation. Fix this by un-mapping the MBA region post firmware copy and MBA text log dumps. Signed-off-by: Sibi Sankar Link: https://lore.kernel.org/r/1604473422-29639-2-git-send-email-sibis@codeaurora.org [bjorn: Renamed "ptr" to "mba_region"] Signed-off-by: Bjorn Andersson --- drivers/remoteproc/qcom_q6v5_mss.c | 37 ++++++++++++++++++------------ 1 file changed, 22 insertions(+), 15 deletions(-) diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c index 31412b705..720fc36d8 100644 --- a/drivers/remoteproc/qcom_q6v5_mss.c +++ b/drivers/remoteproc/qcom_q6v5_mss.c @@ -189,7 +189,6 @@ struct q6v5 { size_t total_dump_size; phys_addr_t mba_phys; - void *mba_region; size_t mba_size; size_t dp_size; @@ -411,7 +410,7 @@ static int q6v5_xfer_mem_ownership(struct q6v5 *qproc, int *current_perm, current_perm, next, perms); } -static void q6v5_debug_policy_load(struct q6v5 *qproc) +static void q6v5_debug_policy_load(struct q6v5 *qproc, void *mba_region) { const struct firmware *dp_fw; @@ -419,7 +418,7 @@ static void q6v5_debug_policy_load(struct q6v5 *qproc) return; if (SZ_1M + dp_fw->size <= qproc->mba_size) { - memcpy(qproc->mba_region + SZ_1M, dp_fw->data, dp_fw->size); + memcpy(mba_region + SZ_1M, dp_fw->data, dp_fw->size); qproc->dp_size = dp_fw->size; } @@ -429,6 +428,7 @@ static void q6v5_debug_policy_load(struct q6v5 *qproc) static int q6v5_load(struct rproc *rproc, const struct firmware *fw) { struct q6v5 *qproc = rproc->priv; + void *mba_region; /* MBA is restricted to a maximum size of 1M */ if (fw->size > qproc->mba_size || fw->size > SZ_1M) { @@ -436,8 +436,16 @@ static int q6v5_load(struct rproc *rproc, const struct firmware *fw) return -EINVAL; } - memcpy(qproc->mba_region, fw->data, fw->size); - q6v5_debug_policy_load(qproc); + mba_region = memremap(qproc->mba_phys, qproc->mba_size, MEMREMAP_WC); + if (!mba_region) { + dev_err(qproc->dev, "unable to map memory region: %pa+%zx\n", + &qproc->mba_phys, qproc->mba_size); + return -EBUSY; + } + + memcpy(mba_region, fw->data, fw->size); + q6v5_debug_policy_load(qproc, mba_region); + memunmap(mba_region); return 0; } @@ -544,6 +552,7 @@ static void q6v5_dump_mba_logs(struct q6v5 *qproc) { struct rproc *rproc = qproc->rproc; void *data; + void *mba_region; if (!qproc->has_mba_logs) return; @@ -552,12 +561,16 @@ static void q6v5_dump_mba_logs(struct q6v5 *qproc) qproc->mba_size)) return; - data = vmalloc(MBA_LOG_SIZE); - if (!data) + mba_region = memremap(qproc->mba_phys, qproc->mba_size, MEMREMAP_WC); + if (!mba_region) return; - memcpy(data, qproc->mba_region, MBA_LOG_SIZE); - dev_coredumpv(&rproc->dev, data, MBA_LOG_SIZE, GFP_KERNEL); + data = vmalloc(MBA_LOG_SIZE); + if (data) { + memcpy(data, mba_region, MBA_LOG_SIZE); + dev_coredumpv(&rproc->dev, data, MBA_LOG_SIZE, GFP_KERNEL); + } + memunmap(mba_region); } static int q6v5proc_reset(struct q6v5 *qproc) @@ -1608,12 +1621,6 @@ static int q6v5_alloc_memory_region(struct q6v5 *qproc) qproc->mba_phys = r.start; qproc->mba_size = resource_size(&r); - qproc->mba_region = devm_ioremap_wc(qproc->dev, qproc->mba_phys, qproc->mba_size); - if (!qproc->mba_region) { - dev_err(qproc->dev, "unable to map memory region: %pa+%zx\n", - &r.start, qproc->mba_size); - return -EBUSY; - } if (!child) { node = of_parse_phandle(qproc->dev->of_node, -- 2.34.1