diff options
| author | Sibi Sankar <quic_sibis@quicinc.com> | 2022-05-11 08:57:05 +0300 |
|---|---|---|
| committer | Bjorn Andersson <bjorn.andersson@linaro.org> | 2022-07-18 23:32:33 +0300 |
| commit | fc156629b23a21181e473e60341e3a78af25a1d4 (patch) | |
| tree | f77ee61691643d6cefec751e2c91dbc4c6e08f2a /drivers/remoteproc | |
| parent | 8672e79d98bc702084f65ef6d118333bd73f09a2 (diff) | |
| download | linux-fc156629b23a21181e473e60341e3a78af25a1d4.tar.xz | |
remoteproc: qcom_q6v5_mss: map/unmap metadata region before/after use
The application processor accessing the dynamically assigned metadata
region after assigning it to the remote Q6 would lead to an XPU violation.
Fix this by un-mapping the metadata region post firmware header copy. The
metadata region is freed only after the modem Q6 is done with fw header
authentication.
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1652248625-990-1-git-send-email-quic_sibis@quicinc.com
Diffstat (limited to 'drivers/remoteproc')
| -rw-r--r-- | drivers/remoteproc/qcom_q6v5_mss.c | 38 |
1 files changed, 32 insertions, 6 deletions
diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c index af217de75e4d..4b37e11fbb03 100644 --- a/drivers/remoteproc/qcom_q6v5_mss.c +++ b/drivers/remoteproc/qcom_q6v5_mss.c @@ -10,6 +10,7 @@ #include <linux/clk.h> #include <linux/delay.h> #include <linux/devcoredump.h> +#include <linux/dma-map-ops.h> #include <linux/dma-mapping.h> #include <linux/interrupt.h> #include <linux/kernel.h> @@ -932,27 +933,52 @@ static void q6v5proc_halt_axi_port(struct q6v5 *qproc, static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw, const char *fw_name) { - unsigned long dma_attrs = DMA_ATTR_FORCE_CONTIGUOUS; + unsigned long dma_attrs = DMA_ATTR_FORCE_CONTIGUOUS | DMA_ATTR_NO_KERNEL_MAPPING; + unsigned long flags = VM_DMA_COHERENT | VM_FLUSH_RESET_PERMS; + struct page **pages; + struct page *page; dma_addr_t phys; void *metadata; int mdata_perm; int xferop_ret; size_t size; - void *ptr; + void *vaddr; + int count; int ret; + int i; metadata = qcom_mdt_read_metadata(fw, &size, fw_name, qproc->dev); if (IS_ERR(metadata)) return PTR_ERR(metadata); - ptr = dma_alloc_attrs(qproc->dev, size, &phys, GFP_KERNEL, dma_attrs); - if (!ptr) { + page = dma_alloc_attrs(qproc->dev, size, &phys, GFP_KERNEL, dma_attrs); + if (!page) { kfree(metadata); dev_err(qproc->dev, "failed to allocate mdt buffer\n"); return -ENOMEM; } - memcpy(ptr, metadata, size); + count = PAGE_ALIGN(size) >> PAGE_SHIFT; + pages = kmalloc_array(count, sizeof(struct page *), GFP_KERNEL); + if (!pages) { + ret = -ENOMEM; + goto free_dma_attrs; + } + + for (i = 0; i < count; i++) + pages[i] = nth_page(page, i); + + vaddr = vmap(pages, count, flags, pgprot_dmacoherent(PAGE_KERNEL)); + kfree(pages); + if (!vaddr) { + dev_err(qproc->dev, "unable to map memory region: %pa+%zx\n", &phys, size); + ret = -EBUSY; + goto free_dma_attrs; + } + + memcpy(vaddr, metadata, size); + + vunmap(vaddr); /* Hypervisor mapping to access metadata by modem */ mdata_perm = BIT(QCOM_SCM_VMID_HLOS); @@ -982,7 +1008,7 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw, "mdt buffer not reclaimed system may become unstable\n"); free_dma_attrs: - dma_free_attrs(qproc->dev, size, ptr, phys, dma_attrs); + dma_free_attrs(qproc->dev, size, page, phys, dma_attrs); kfree(metadata); return ret < 0 ? ret : 0; |