mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-30 13:52:50 +01:00
Mukesh Ojha
0b0379fcf9
Qualcomm remoteproc drivers such as qcom_q6v5_mss, which do not use the Peripheral Authentication Service (PAS), always map the MBA region before use and unmap it once the usage is complete. This behavior was introduced to avoid issues seen in the past where speculative accesses from the application processor to the MBA region after it was assigned to the remote Q6 led to an XPU violation. The issue was mitigated by unmapping the region before handing control to the remote Q6. Currently, most Qualcomm SoCs using the PAS driver run either with a standalone QHEE or the Gunyah hypervisor. In these environments, the hypervisor unmaps the Q6 memory from HLOS Stage-2 and remaps it into the Q6 Stage-2 page table. As a result, speculative accesses from HLOS cannot reach the region even if it remains mapped in HLOS Stage-1; therefore, XPU violations cannot occur. However, when the same SoC runs Linux at EL2, Linux itself must perform the unmapping to avoid such issues. It is still correct to apply this mapping/ unmapping sequence even for SoCs that run under Gunyah, so this behavior should not be conditional. Introduce qcom_pas_ctx_map() in qcom_pas.h to centralise the ioremap_wc pattern used by both qcom_q6v5_pas and qcom_mdt_pas_load, and use it in both places. Reviewed-by: Dmitry Baryshkov <[email protected]> Reviewed-by: Konrad Dybcio <[email protected]> Signed-off-by: Mukesh Ojha <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Bjorn Andersson <[email protected]>
74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __QCOM_MDT_LOADER_H__
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#define __QCOM_MDT_LOADER_H__
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#include <linux/types.h>
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#define QCOM_MDT_TYPE_MASK (7 << 24)
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#define QCOM_MDT_TYPE_HASH (2 << 24)
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#define QCOM_MDT_RELOCATABLE BIT(27)
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struct device;
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struct firmware;
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struct qcom_pas_context;
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#if IS_ENABLED(CONFIG_QCOM_MDT_LOADER)
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ssize_t qcom_mdt_get_size(const struct firmware *fw);
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int qcom_mdt_load(struct device *dev, const struct firmware *fw,
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const char *fw_name, int pas_id, void *mem_region,
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phys_addr_t mem_phys, size_t mem_size,
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phys_addr_t *reloc_base);
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int qcom_mdt_pas_load(struct qcom_pas_context *ctx, const struct firmware *fw,
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const char *firmware, phys_addr_t *reloc_base);
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int qcom_mdt_load_no_init(struct device *dev, const struct firmware *fw,
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const char *fw_name, void *mem_region,
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phys_addr_t mem_phys, size_t mem_size,
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phys_addr_t *reloc_base);
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void *qcom_mdt_read_metadata(const struct firmware *fw, size_t *data_len,
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const char *fw_name, struct device *dev);
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#else /* !IS_ENABLED(CONFIG_QCOM_MDT_LOADER) */
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static inline ssize_t qcom_mdt_get_size(const struct firmware *fw)
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{
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return -ENODEV;
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}
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static inline int qcom_mdt_load(struct device *dev, const struct firmware *fw,
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const char *fw_name, int pas_id,
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void *mem_region, phys_addr_t mem_phys,
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size_t mem_size, phys_addr_t *reloc_base)
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{
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return -ENODEV;
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}
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static inline int qcom_mdt_pas_load(struct qcom_pas_context *ctx,
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const struct firmware *fw, const char *firmware,
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phys_addr_t *reloc_base)
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{
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return -ENODEV;
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}
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static inline int qcom_mdt_load_no_init(struct device *dev,
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const struct firmware *fw,
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const char *fw_name, void *mem_region,
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phys_addr_t mem_phys, size_t mem_size,
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phys_addr_t *reloc_base)
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{
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return -ENODEV;
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}
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static inline void *qcom_mdt_read_metadata(const struct firmware *fw,
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size_t *data_len, const char *fw_name,
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struct device *dev)
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{
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return ERR_PTR(-ENODEV);
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}
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#endif /* !IS_ENABLED(CONFIG_QCOM_MDT_LOADER) */
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#endif
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