diff options
author | Lucas De Marchi <lucas.demarchi@intel.com> | 2019-06-07 12:12:27 +0300 |
---|---|---|
committer | Lucas De Marchi <lucas.demarchi@intel.com> | 2019-06-17 22:32:31 +0300 |
commit | 08f8984fd733535683c4d91319884204be06696d (patch) | |
tree | ed7c9d942b80264fe6b68bfa7ce45f13c121587d /drivers/gpu/drm/i915/intel_csr.c | |
parent | 32fd773384afc2b9e8dfc9c8ee1927f34b852fab (diff) | |
download | linux-08f8984fd733535683c4d91319884204be06696d.tar.xz |
drm/i915/dmc: extract function to parse dmc_header
Complete the extraction of functions to parse specific parts of the
firmware. The return of the function parse_csr_fw() is now redundant
since it already sets the dmc_payload field. Changing it is left for
later to avoid noise in the commit.
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190607091230.1489-7-lucas.demarchi@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/intel_csr.c')
-rw-r--r-- | drivers/gpu/drm/i915/intel_csr.c | 130 |
1 files changed, 74 insertions, 56 deletions
diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c index a0188f87904f..4622f7f32a23 100644 --- a/drivers/gpu/drm/i915/intel_csr.c +++ b/drivers/gpu/drm/i915/intel_csr.c @@ -332,6 +332,74 @@ static u32 find_dmc_fw_offset(const struct intel_fw_info *fw_info, return dmc_offset; } +static u32 parse_csr_fw_dmc(struct intel_csr *csr, + const struct intel_dmc_header *dmc_header, + size_t rem_size) +{ + unsigned int i, payload_size; + u32 r; + u8 *payload; + + if (rem_size < sizeof(struct intel_dmc_header)) + goto error_truncated; + + if (sizeof(struct intel_dmc_header) != dmc_header->header_len) { + DRM_ERROR("DMC firmware has wrong dmc header length " + "(%u bytes)\n", + (dmc_header->header_len)); + return 0; + } + + /* Cache the dmc header info. */ + if (dmc_header->mmio_count > ARRAY_SIZE(csr->mmioaddr)) { + DRM_ERROR("DMC firmware has wrong mmio count %u\n", + dmc_header->mmio_count); + return 0; + } + + csr->mmio_count = dmc_header->mmio_count; + for (i = 0; i < dmc_header->mmio_count; i++) { + if (dmc_header->mmioaddr[i] < CSR_MMIO_START_RANGE || + dmc_header->mmioaddr[i] > CSR_MMIO_END_RANGE) { + DRM_ERROR("DMC firmware has wrong mmio address 0x%x\n", + dmc_header->mmioaddr[i]); + return 0; + } + csr->mmioaddr[i] = _MMIO(dmc_header->mmioaddr[i]); + csr->mmiodata[i] = dmc_header->mmiodata[i]; + } + + rem_size -= dmc_header->header_len; + + /* fw_size is in dwords, so multiplied by 4 to convert into bytes. */ + payload_size = dmc_header->fw_size * 4; + if (rem_size < payload_size) + goto error_truncated; + + if (payload_size > csr->max_fw_size) { + DRM_ERROR("DMC FW too big (%u bytes)\n", payload_size); + return 0; + } + csr->dmc_fw_size = dmc_header->fw_size; + + csr->dmc_payload = kmalloc(payload_size, GFP_KERNEL); + if (!csr->dmc_payload) { + DRM_ERROR("Memory allocation failed for dmc payload\n"); + return 0; + } + + r = sizeof(struct intel_dmc_header); + payload = (u8 *)(dmc_header) + r; + memcpy(csr->dmc_payload, payload, payload_size); + r += payload_size; + + return r; + +error_truncated: + DRM_ERROR("Truncated DMC firmware, refusing.\n"); + return 0; +} + static u32 parse_csr_fw_package(struct intel_csr *csr, const struct intel_package_header *package_header, @@ -432,10 +500,8 @@ static u32 *parse_csr_fw(struct drm_i915_private *dev_priv, struct intel_dmc_header *dmc_header; struct intel_csr *csr = &dev_priv->csr; const struct stepping_info *si = intel_get_stepping_info(dev_priv); - u32 readcount = 0, nbytes; - u32 i, r; - u32 *dmc_payload; - size_t fsize; + u32 readcount = 0; + u32 r; if (!fw) return NULL; @@ -455,62 +521,14 @@ static u32 *parse_csr_fw(struct drm_i915_private *dev_priv, return NULL; readcount += r; - fsize = readcount + - sizeof(struct intel_dmc_header); - if (fsize > fw->size) - goto error_truncated; - /* Extract dmc_header information. */ + /* Extract dmc_header information */ dmc_header = (struct intel_dmc_header *)&fw->data[readcount]; - if (sizeof(struct intel_dmc_header) != (dmc_header->header_len)) { - DRM_ERROR("DMC firmware has wrong dmc header length " - "(%u bytes)\n", - (dmc_header->header_len)); - return NULL; - } - readcount += sizeof(struct intel_dmc_header); - - /* Cache the dmc header info. */ - if (dmc_header->mmio_count > ARRAY_SIZE(csr->mmioaddr)) { - DRM_ERROR("DMC firmware has wrong mmio count %u\n", - dmc_header->mmio_count); - return NULL; - } - csr->mmio_count = dmc_header->mmio_count; - for (i = 0; i < dmc_header->mmio_count; i++) { - if (dmc_header->mmioaddr[i] < CSR_MMIO_START_RANGE || - dmc_header->mmioaddr[i] > CSR_MMIO_END_RANGE) { - DRM_ERROR("DMC firmware has wrong mmio address 0x%x\n", - dmc_header->mmioaddr[i]); - return NULL; - } - csr->mmioaddr[i] = _MMIO(dmc_header->mmioaddr[i]); - csr->mmiodata[i] = dmc_header->mmiodata[i]; - } - - /* fw_size is in dwords, so multiplied by 4 to convert into bytes. */ - nbytes = dmc_header->fw_size * 4; - fsize += nbytes; - if (fsize > fw->size) - goto error_truncated; - - if (nbytes > csr->max_fw_size) { - DRM_ERROR("DMC FW too big (%u bytes)\n", nbytes); - return NULL; - } - csr->dmc_fw_size = dmc_header->fw_size; - - dmc_payload = kmalloc(nbytes, GFP_KERNEL); - if (!dmc_payload) { - DRM_ERROR("Memory allocation failed for dmc payload\n"); + r = parse_csr_fw_dmc(csr, dmc_header, fw->size - readcount); + if (!r) return NULL; - } - return memcpy(dmc_payload, &fw->data[readcount], nbytes); - -error_truncated: - DRM_ERROR("Truncated DMC firmware, rejecting.\n"); - return NULL; + return csr->dmc_payload; } static void intel_csr_runtime_pm_get(struct drm_i915_private *dev_priv) |